TY  - GEN
A1  - Staat, Manfred
T1  - Technische Mechanik. Vorlesungsmitschrift. Korrigierter Nachdr. der 3. Aufl.
N2  - Überarbeitete, korrigierte und ergänzte Version einer Vorlesungsmitschrift von Sebastian Krämer. 172 S. Inhaltsverzeichnis 0 Einführung in die Mechanik 1 Statik starrer Körper 2 Elastostatik (Festigkeitslehre) 3 Kinematik 4 Kinetik Literatur
KW  - Technische Mechanik
Y1  - 2006
ER  - 
TY  - JOUR
A1  - Turlybekuly, Amanzhol
A1  - Pogrebnjak, Alexander
A1  - Sukhodub, L. F.
A1  - Sukhodub, Liudmyla B.
A1  - Kistaubayeva, A. S.
A1  - Savitskaya, Irina
A1  - Shokatayeva, D. H.
A1  - Bondar, Oleksandr V.
A1  - Shaimardanov, Z. K.
A1  - Plotnikov, Sergey V.
A1  - Shaimardanova, B. H.
A1  - Digel, Ilya
T1  - Synthesis, characterization, in vitro biocompatibility and antibacterial properties study of nanocomposite materials based on hydroxyapatite-biphasic ZnO micro- and nanoparticles embedded in Alginate matrix
JF  - Materials Science and Engineering C
Y1  - 2019
U6  - http://dx.doi.org/10.1016/j.msec.2019.109965
VL  - 104
IS  - Article number 109965
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - BOOK
A1  - Staat, Manfred
A1  - Digel, Ilya
A1  - Trzewik, Jürgen
A1  - Sielemann, Stefanie
A1  - Erni, Daniel
A1  - Zylka, Waldemar
T1  - Symposium Proceedings; 4th YRA MedTech Symposium 2024 : February 1 / 2024 / FH Aachen
Y1  - 2024
SN  - 978-3-940402-65-3
U6  - http://dx.doi.org/10.17185/duepublico/81475
PB  - Universität Duisburg-Essen
CY  - Duisburg
ER  - 
TY  - BOOK
A1  - Staat, Manfred
A1  - Erni, Daniel
T1  - Symposium Proceedings; 3rd YRA MedTech Symposium 2019: May 24 / 2019 / FH Aachen
Y1  - 2019
SN  - 978-3-940402-22-6
U6  - http://dx.doi.org/10.17185/duepublico/48750
PB  - Universität Duisburg-Essen
CY  - Duisburg
ER  - 
TY  - JOUR
A1  - Kodomskoi, Leonid
A1  - Kotliar, Konstantin
A1  - Schröder, Andreas
A1  - Weiss, Michael
A1  - Hille, Konrad
T1  - Suture-Probe Canaloplasty as an Alternative to Canaloplasty using the iTrack™ Microcatheter
JF  - Journal of Glaucoma
Y1  - 2019
U6  - http://dx.doi.org/10.1097/IJG.0000000000001321
SN  - 1057-0829
IS  - Epub ahead of print
PB  - Lippincott Williams & Wilkins
CY  - Philadelphia
ER  - 
TY  - JOUR
A1  - Hackl, M.
A1  - Andermahr, J.
A1  - Staat, Manfred
A1  - Bremer, I.
A1  - Borggrefe, J.
A1  - Prescher, A.
A1  - Müller, L. P.
A1  - Wegmann, K.
T1  - Suture button reconstruction of the central band of the interosseous membrane in Essex-Lopresti lesions: a comparative biomechanical investigation
JF  - The Journal of Hand Surgery (European Volume)
Y1  - 2017
U6  - http://dx.doi.org/10.1177/1753193416665943
SN  - 2043-6289 (Online)
SN  - 1753-1934 (Print)
VL  - 42
IS  - 4
SP  - 370
EP  - 376
PB  - Sage
CY  - London
ER  - 
TY  - JOUR
A1  - Digel, Ilya
A1  - Wehlitz, V.
A1  - Kayser, Peter
A1  - Figiel-Lange, A.
A1  - Bassam, R.
A1  - Rundstedt, F. von
T1  - Suspension depletion approach for exemption of infected Solanum jasminoides cells from pospiviroids
JF  - Plant Pathology
N2  - Despite numerous studies, viroid elimination from infected plants remains a very challenging task. This study introduces for the first time a novel ‘suspension depletion’ approach for exemption of Solanum jasminoides plants from viroids. The proposed method implies initial establishment of suspension cultures of the infected plant cells. The suspended cells were then physically treated (mild thermotherapy, 33 °C), which presumably delayed the replication of the viroid. The viroid concentration in the treated biomass was monitored weekly using pospiviroid-specific PCR. After 10–12 weeks of continuous treatment, a sufficient decrease in viroid concentration was observed such that the infection became undetectable by PCR. The treated single cells then gave rise to microcolonies on a solid culture medium and the obtained viroid-negative clones were further promoted to regenerate into viroid-free plants. Three years of accumulated experimental data suggests feasibility, broad applicability, and good efficacy of the proposed approach.
Y1  - 2018
U6  - http://dx.doi.org/10.1111/ppa.12750
SN  - 1365-3059
VL  - 67
IS  - 2
SP  - 358
EP  - 365
PB  - Wiley
CY  - Oxford
ER  - 
TY  - JOUR
A1  - Bhattarai, Aroj
A1  - Jabbari, Medisa
A1  - Anding, Ralf
A1  - Staat, Manfred
T1  - Surgical treatment of vaginal vault prolapse using different prosthetic mesh implants: a finite element analysis
JF  - tm - Technisches Messen
N2  - Particularly multiparous elderly women may suffer from vaginal vault prolapse after hysterectomy due to weak support from lax apical ligaments. A decreased amount of estrogen and progesterone in older age is assumed to remodel the collagen thereby reducing tissue stiffness. Sacrocolpopexy is either performed as open or laparoscopic surgery using prosthetic mesh implants to substitute lax ligaments. Y-shaped mesh models (DynaMesh, Gynemesh, and Ultrapro) are implanted in a 3D female pelvic floor finite element model in the extraperitoneal space from the vaginal cuff to the first sacral (S1) bone below promontory. Numerical simulations are conducted during Valsalva maneuver with weakened tissues modeled by reduced tissue stiffness. Tissues are modeled as incompressible, isotropic hyperelastic materials whereas the meshes are modeled either as orthotropic linear elastic or as isotropic hyperlastic materials. The positions of the vaginal cuff and the bladder base are calculated from the pubococcygeal line for female pelvic floor at rest, for prolapse and after repair using the three meshes. Due to mesh mechanics and mesh pore deformation along the loaded direction, the DynaMesh with regular rectangular mesh pores is found to provide better mechanical support to the organs than the Gynemesh and the Ultrapro with irregular hexagonal mesh pores.

Insbesondere ältere, mehrgebährende Frauen leiden häufiger an einem Scheidenvorfall nach einer Hysterektomie aufgrund der schwachen Unterstützung durch laxe apikale Bänder. Es wird angenommen, dass eine verringerte Menge an Östrogen und Progesteron im höheren Alter das Kollagen umformt, wodurch die Gewebesteifigkeit reduziert wird. Die Sakrokolpopexie ist eine offene oder laparoskopische Operation, die mit prothetischen Netzimplantaten durchgeführt wird, um laxe Bänder zu ersetzen. Y-förmige Netzmodelle (DynaMesh, Gynemesh und Ultrapro) werden in einem 3D-Modell des weiblichen Beckenbodens im extraperitonealen Raum vom Vaginalstumpf bis zum Promontorium implantiert. Numerische Simulationen werden während des Valsalva-Manövers mit geschwächtem Gewebe durchgeführt, das durch eine reduzierte Gewebesteifigkeit modelliert wird. Die Gewebe werden als inkompressible, isotrop hyperelastische Materialien modelliert, während die Netze entweder als orthotrope linear elastische oder als isotrope hyperlastische Materialien modelliert werden. Die Positionen des Vaginalstumpfs, der Blase und der Harnröhrenachse werden anhand der Pubococcygeallinie aus der Ruhelage, für den Prolaps und nach der Reparatur unter Verwendung der drei Netze berechnet. Aufgrund der Netzmechanik und der Netzporenverformung bietet das DynaMesh mit regelmäßigen rechteckigen Netzporen eine bessere mechanische Unterstützung und eine Neupositionierung des Scheidengewölbes, der Blase und der Urethraachse als Gynemesh und Ultrapro mit unregelmäßigen hexagonalen Netzporen.
Y1  - 2018
U6  - http://dx.doi.org/10.1515/teme-2017-0115
SN  - 2196-7113
VL  - 85
IS  - 5
SP  - 331
EP  - 342
PB  - De Gruyter
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Balakirski, Galina
A1  - Kotliar, Konstantin
A1  - Pauly, Karolin J.
A1  - Krings, Laura K.
A1  - Rübben, Albert
A1  - Baron, Jens M.
A1  - Schmitt, Laurenz
T1  - Surgical Site Infections After Dermatologic Surgery in Immunocompromised Patients: A Single-Center Experience
JF  - Dermatologic Surgery
N2  - BACKGROUND 
Immunosuppression is often considered as an indication for antibiotic prophylaxis to prevent surgical site infections (SSI) while performing skin surgery. However, the data on the risk of developing SSI after dermatologic surgery in immunosuppressed patients are limited.

PATIENTS AND METHODS 
All patients of the Department of Dermatology and Allergology at the University Hospital of RWTH Aachen in Aachen, Germany, who underwent hospitalization for a dermatologic surgery between June 2016 and January 2017 (6 months), were followed up after surgery until completion of the wound healing process. The follow-up addressed the occurrence of SSI and the need for systemic antibiotics after the operative procedure. Immunocompromised patients were compared with immunocompetent patients. The investigation was conducted as a retrospective analysis of patient records.

RESULTS 
The authors performed 284 dermatologic surgeries in 177 patients. Nineteen percent (54/284) of the skin surgery was performed on immunocompromised patients. The most common indications for surgical treatment were nonmelanoma skin cancer and malignant melanomas. Surgical site infections occurred in 6.7% (19/284) of the cases. In 95% (18/19), systemic antibiotic treatment was needed. Twenty-one percent of all SSI (4/19) were seen in immunosuppressed patients.

CONCLUSION 
According to the authors' data, immunosuppression does not represent a significant risk factor for SSI after dermatologic surgery. However, larger prospective studies are needed to make specific recommendations on the use of antibiotic prophylaxis while performing skin surgery in these patients.

The available data on complications after dermatologic surgery have improved over the past years. Particularly, additional risk factors have been identified for surgical site infections (SSI). Purulent surgical sites, older age, involvement of head, neck, and acral regions, and also the involvement of less experienced surgeons have been reported to increase the risk of the SSI after dermatologic surgeries.1 In general, the incidence of SSI after skin surgery is considered to be low.1,2 However, antibiotics in dermatologic surgeries, especially in the perioperative setting, seem to be overused,3,4 particularly regarding developing antibiotic resistances and side effects.

Immunosuppression has been recommended to be taken into consideration as an additional indication for antibiotic prophylaxis to prevent SSI after skin surgery in special cases.5,6 However, these recommendations do not specify the exact dermatologic surgeries, and were not specifically developed for dermatologic surgery patients and treatments, but adopted from other surgical fields.6 According to the survey conducted on American College of Mohs Surgery members in 2012, 13% to 29% of the surgeons administered antibiotic prophylaxis to immunocompromised patients to prevent SSI while performing dermatologic surgery on noninfected skin,3 although this was not recommended by Journal of the American Academy of Dermatology Advisory Statement. Indeed, the data on the risk of developing SSI after dermatologic surgery in immunosuppressed patients are limited. However, it is possible that due to the insufficient evidence on the risk of SSI occurrence in this patient group, dermatologic surgeons tend to overuse perioperative antibiotic prophylaxis.

To make specific recommendations on the use of antibiotic prophylaxis in immunosuppressed patients in the field of skin surgery, more information about the incidence of SSI after dermatologic surgery in these patients is needed. The aim of this study was to fill this data gap by investigating whether there is an increased risk of SSI after skin surgery in immunocompromised patients compared with immunocompetent patients.
Y1  - 2018
U6  - http://dx.doi.org/10.1097/DSS.0000000000001615
IS  - 44 (12)
SP  - 1525
EP  - 1536
PB  - Wolters Kluwer
ER  - 
TY  - JOUR
A1  - Hamou, Hussam Aldin
A1  - Kotliar, Konstantin
A1  - Tan, Sonny Kian
A1  - Weiß, Christel
A1  - Blume, Christian
A1  - Clusmann, Hans
A1  - Schubert, Gerrit Alexander
A1  - Albanna, Walid
T1  - Surgical nuances and placement of subgaleal drains for supratentorial procedures—a prospective analysis of efficacy and outcome in 150 craniotomies
JF  - Acta Neurochirurgica
N2  - Background
For supratentorial craniotomy, surgical access, and closure technique, including placement of subgaleal drains, may vary considerably. The influence of surgical nuances on postoperative complications such as cerebrospinal fluid leakage or impaired wound healing overall remains largely unclear. With this study, we are reporting our experiences and the impact of our clinical routines on outcome in a prospectively collected data set.

Method
We prospectively observed 150 consecutive patients undergoing supratentorial craniotomy and recorded technical variables (type/length of incision, size of craniotomy, technique of dural and skin closure, type of dressing, and placement of subgaleal drains). Outcome variables (subgaleal hematoma/CSF collection, periorbital edema, impairment of wound healing, infection, and need for operative revision) were recorded at time of discharge and at late follow-up.

Results
Early subgaleal fluid collection was observed in 36.7% (2.8% at the late follow-up), and impaired wound healing was recorded in 3.3% of all cases, with an overall need for operative revision of 6.7%. Neither usage of dural sealants, lack of watertight dural closure, and presence of subgaleal drains, nor type of skin closure or dressing influenced outcome. Curved incisions, larger craniotomy, and tumor size, however, were associated with an increase in early CSF or hematoma collection (p < 0.0001, p = 0.001, p < 0.01 resp.), and larger craniotomy size was associated with longer persistence of subgaleal fluid collections (p < 0.05).

Conclusions
Based on our setting, individual surgical nuances such as the type of dural closure and the use of subgaleal drains resulted in a comparable complication rate and outcome. Subgaleal fluid collections were frequently observed after supratentorial procedures, irrespective of the closing technique employed, and resolve spontaneously in the majority of cases without significant sequelae. Our results are limited due to the observational nature in our single-center study and need to be validated by supportive prospective randomized design.
Y1  - 2020
U6  - http://dx.doi.org/10.1007/s00701-019-04196-6
SN  - 0942-0940
VL  - 2020
IS  - 162
SP  - 729
EP  - 736
PB  - Springer Nature
CY  - Cham
ER  - 
TY  - THES
A1  - Schieffer, Andre
T1  - Studies on diversity and coexistence in an experimental microbial community
N2  - Biodiversity and the coexistence of species have puzzled and fascinated biologists since decades and is a hotspot in todays’ natural sciences. Preserving this biodiversity is a great challenge as habitats and environments underlying tremendous changes like climate change and the loss of natural habitats, which are mainly due to anthropogenic influences. The coexistence of numerous species even in homogeneous environments is a stunning feature of natural communities and has been summarized under the term ‘paradox of plankton’. Up to now, there are several mechanisms discussed, which may contribute to local and global diversity of organisms. Several interspecific trade offs have been identified maintaining the coexistence of species like their abilities regarding competition and predator avoidance, their capability to disperse in space and time, and their ability to exploit variable resources. Further, micro-evolutionary dynamics supporting the coexistence of species have been added to our knowledge, and deriving from theoretical deterministic models, non-linear dynamics which describe the temporal fluctuation of abundances of organisms. Whereas competition and predation seem to be clue structural elements within interacting organisms, the intrinsic dynamic behavior – by means of temporal changes in abundance - plays an important role regarding coexistence within a community. The present work sheds light on different factors affecting the coexistence of species using experimental microbial model systems consisting of a bacterivorous ciliate as the predator and two bacteria strains as prey organism. Additionally, another experimental setup consisting of two up to five bacteria species competing for one limiting resource was investigated. Highly controllable chemostat systems were established to exclude extrinsic disturbances. According to theoretical analyses I was able to show - experimentally and theoretically - that phenotypic plasticity of one species within a microbial one-predator-two-prey food web enlarges the range of possible coexistence of all species under different dynamic conditions, compared to a food web without phenotypic plasticity. This was accompanied by non-linear (chaotic) population dynamics within all experimental systems showing phenotypic plasticity. The experiments on the interplay of competition, predation and invasion showed that all aspects have an influence on species coexistence. Under undisturbed controlled conditions all aspects were analyzed in detail and in combination. Populations showed oscillations which were shown by quasi-chaotic attractors in phase space diagrams. Competition experiments with two up to five bacteria species competing for one limiting resource showed that all organisms were able to coexist which was mediated by species oscillations entering a regime of chaos. Besides that fact it was found, that the productivity (biomass) as well as the total cell numbers – under the same nutrition supply – increased by an increasing number of species in the experimental systems. Up to now, the occurrence of non-linear dynamics in well controlled experimental studies has been recognized several times and this phenomenon seemed to be more common in natural systems than generally assumed.
N2  - Biodiversität und die Koexistenz von Arten fasziniert und verblüfft Biologen seit Jahr-zehnten und stellen einen Schwerpunkt in der heutigen Umweltforschung dar. Der Schutz und die Konservierung dieser Mannigfaltigkeit stellen eine große Herausfor-derung dar, da die natürlichen Lebensräume sowie die Umwelt enormen Verände-rungen unterworfen sind, welche meist in einem anthropogenen Ursprung wurzeln. Die Koexistenz vieler Arten, auch in relativ homogenen Habitaten ist ein faszinieren-des Charakteristikum natürlicher Lebensgemeinschaften und wird als ‚Paradox des Planktons‘ bezeichnet. Gegenwärtig werden diverse Ursachen diskutiert, welche vermutlich zur lokalen und globalen Diversität von Organismen beitragen. Einige die-ser möglichen Ursachen, die zur Aufrechterhaltung der Koexistenz der Arten beitra-gen, wurden identifiziert: Das Vermögen der Konkurrenz- und Prädationsvermeidung, die Fähigkeit räumlicher sowie zeitlicher Verteilung, sowie das Vermögen variable Ressourcen zu nutzen. Des Weiteren wurden mikro-evolutionäre Phänomene und Dynamiken identifiziert, sowie, von theoretischen deterministischen Modellen ausge-hend, nichtlineare Dynamiken, welche die zeitlichen Schwankungen der Abundanzen von Organismen beschreiben. Diese Aspekte stellen die Schlüsselkomponenten zwi-schen interagierenden Organismen dar, wobei das intrinsiche, nicht lineare dynami-sche Verhalten in Form von zeitlichen Veränderungen in Abundanzen eine zusätzli-che entscheidende Rolle bezüglich der Koexistenz von Arten spielen kann. Einige dieser Aspekte wurden in der vorliegenden Arbeit untersucht. In Anlehnung an theoretische Analysen konnte experimentell sowie theoretisch gezeigt werden, dass phänotypische Plastizität in einer Bakterienart in einem mikrobiellen Ein-Räuber-zwei-Beute-Nahrungsgewebe den Bereich der möglichen Koexistenz unter sich än-dernden experimentellen Bedingungen (Änderungen der Durchflussraten der Chemostate) – im direkten Vergleich zu einem experimentellen Nahrungsgewebe ohne phänotypische Plastizität – erweitern kann. Dies wurde begleitet durch nicht lineare Abundanzschwankungen in den Populationen aller untersuchten Versuchs-ansätze. In weiteren Untersuchungen wurde das Zusammenspiel von Konkurrenz, Prädation und Invasion in einer experimentellen mikrobiellen Gemeinschaft untersucht. Unter kontrollierten Bedingungen konnten diese Aspekte detailliert untersucht werden und es konnten Aufschlüsse darüber gewonnen werden, welche Reaktionen (Interaktionen) innerhalb der untersuchten Gemeinschaften stattfinden. Im Versuchsverlauf wurden Veränderungen in den Abundanzen sowie chaotische Schwankungen der Zellzahlen festgestellt. In Konkurrenzexperimenten von zwei bis zu fünf um eine limitierende Ressource konkurrierende Bakterienarten konnte gezeigt werden, dass alle Arten – vermittelt durch chaotische Abundanzschwankungen – nebeneinander koexistieren konnten. Begleitend dazu wurde herausgefunden, dass die Produktivität (Biomasse) sowie die Gesamtzellzahl bei gleicher Nahrungsverfügbarkeit der experimentellen Systeme mit steigender Artenzahl zunehmen. Gegenwärtig ist das Auftreten von Chaos in gut kontrollierten experimentellen Studien vereinzelt beobachtet worden, wobei dieses Phänomen jedoch häufiger in der Natur aufzutreten scheint als generell vermutet.
Y1  - 2012
N1  - Köln, Univ., Diss., 2012
ER  - 
TY  - THES
A1  - Geenen, Eva-Maria
T1  - Studies of Epstein-Barr virus EBNA2 and its interactions with host cell factors
T1  - Etude de la protéine EBNA2 du virus Epstein-Barr et ses interactions avec les facteurs de la cellule hôte
Y1  - 2013
N1  - Thesis
PB  - Université de Grenoble
CY  - Grenoble
ER  - 
TY  - JOUR
A1  - Zerlin, Kay
A1  - Kasischke, Nicole
A1  - Digel, Ilya
A1  - Maggakis-Kelemen, Christina
A1  - Temiz Artmann, Aysegül
A1  - Porst, Dariusz
A1  - Kayser, Peter
A1  - Linder, Peter
A1  - Artmann, Gerhard
T1  - Structural transition temperature of hemoglobins correlates with species’ body temperature
JF  - European Biophysics Journal. 37 (2007), H. 1
Y1  - 2007
SN  - 1432-1017
SP  - 1
EP  - 10
ER  - 
TY  - JOUR
A1  - Pressler, Axel
A1  - Esefeld, Katrin
A1  - Scherr, Johannes
A1  - Ali, Mohammad
A1  - Hanssen, Henner
A1  - Kotliar, Konstantin
A1  - Lanzl, Ines
A1  - Halle, Martin
A1  - Kaemmerer, Harald
A1  - Schmidt-Trucksäss, Arno
A1  - Hager, Alfred
T1  - Structural alterations of retinal arterioles in adults late after repair of aortic isthmic coarctation
JF  - The American Journal of Cardiology
N2  - Patients after coarctation repair still have an increased risk of cardiovascular or cerebrovascular events. This has been explained by the persisting hypertension and alterations in the peripheral vessels. However, involvement of the central vessels such as the retinal arteries is virtually unknown. A total of 34 patients after coarctation repair (22 men and 12 women; 23 to 58 years old, age range 0 to 32 years at surgical repair) and 34 nonhypertensive controls underwent structural and functional retinal vessel analysis. Using structural analysis, the vessel diameters were measured. Using functional analysis, the endothelium-dependent vessel dilation in response to flicker light stimulation was assessed. In the patients after coarctation repair, the retinal arteriolar diameter was significantly reduced compared to that of the controls (median 182 μm, first to third quartile 171 to 197; vs 197 μm, first to third quartile 193 to 206; p <0.001). These findings were independent of the peripheral blood pressure and age at intervention. No differences were found for venules. The functional analysis findings were not different between the patients and controls (maximum dilation 3.5%, first to third quartile 2.1% to 4.5% vs 3.6%, first to third quartile 2.2% to 4.3%; p = 0.81), indicating preserved autoregulative mechanisms. In conclusion, the retinal artery diameter is reduced in patients after coarctation repair, independent of their current blood pressure level and age at intervention. As a structural marker of chronic vessel damage associated with past, current, or future hypertension, retinal arteriolar narrowing has been linked to stroke incidence. These results indicate an involvement of cerebral microcirculation in aortic coarctation, despite timely repair, and might contribute to explain the increased rate of cerebrovascular events in such patients.
Y1  - 2010
U6  - http://dx.doi.org/10.1016/j.amjcard.2009.10.070
SN  - 0002-9149
VL  - 105
IS  - 5
SP  - 740
EP  - 744
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Frotscher, Ralf
A1  - Staat, Manfred
T1  - Stresses produced by different textile mesh implants in a tissue equivalent
JF  - BioNanoMaterials
N2  - Two single-incision mini-slings used for treating urinary incontinence in women are compared with respect to the stresses they produce in their surrounding tissue. In an earlier paper we experimentally observed that these implants produce considerably different stress distributions in a muscle tissue equivalent. Here we perform 2D finite element analyses to compare the shear stresses and normal stresses in the tissue equivalent for the two meshes and to investigate their failure behavior. The results clearly show that the Gynecare TVT fails for increasing loads in a zipper-like manner because it gradually debonds from the surrounding tissue. Contrary to that, the tissue at the ends of the DynaMesh-SIS direct may rupture but only at higher loads. The simulation results are in good agreement with the experimental observations thus the computational model helps to interpret the experimental results and provides a tool for qualitative evaluation of mesh implants.
Y1  - 2014
U6  - http://dx.doi.org/10.1515/bnm-2014-0003
SN  - 2191-4672 (E-Journal); 2193-066X (E-Journal); 0011-8656 (Print); 1616-0177 (Print); 2193-0651 (Print)
VL  - 15
IS  - 1-2
SP  - 25
EP  - 30
PB  - De Gruyter
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Staat, Manfred
A1  - Tran, Ngoc Trinh
T1  - Strain based brittle failure criteria for rocks
T2  - Proceedings of (NACOME2022) The 11th National Conference on Mechanics, Vol. 1. Solid Mechanics, Rock Mechanics, Artificial Intelligence, Teaching and Training, Hanoi, December 2-3, 2022
N2  - When confining pressure is low or absent, extensional fractures are typical, with fractures occurring on unloaded planes in rock. These “paradox” fractures can be explained by a phenomenological extension strain failure criterion. In the past, a simple empirical criterion for fracture initiation in brittle rock has been developed. But this criterion makes unrealistic strength predictions in biaxial compression and tension. A new extension strain criterion overcomes this limitation by adding a weighted principal shear component. The weight is chosen, such that the enriched extension strain criterion represents the same failure surface as the Mohr–Coulomb (MC) criterion. Thus, the MC criterion has been derived as an extension strain criterion predicting failure modes, which are unexpected in the understanding of the failure of cohesive-frictional materials. In progressive damage of rock, the most likely fracture direction is orthogonal to the maximum extension strain. The enriched extension strain criterion is proposed as a threshold surface for crack initiation CI and crack damage CD and as a failure surface at peak P. Examples show that the enriched extension strain criterion predicts much lower volumes of damaged rock mass compared to the simple extension strain criterion.
KW  - Extension fracture
KW  - Extension strain criterion
KW  - Mohr–Coulomb criterion
KW  - Evolution of damage
Y1  - 2023
SN  - 978-604-357-084-7
SP  - 500
EP  - 509
PB  - Nha xuat ban Khoa hoc tu nhien va Cong nghe (Verlag Naturwissenschaft und Technik)
CY  - Hanoi
ER  - 
TY  - BOOK
A1  - Artmann, Gerhard
T1  - Stem cell engineering : principles and applications / Gerhard M. Artmann ... eds.
Y1  - 2011
SN  - 978-3-642-11864-7
PB  - Springer
CY  - Berlin [u.a.]
ER  - 
TY  - JOUR
A1  - Kappmeyer, K.
A1  - Kotliar, Konstantin
A1  - Lanzl, I. M.
T1  - Spielen von Blasinstrumenten und Augeninnendruck
JF  - Zeitschrift für praktische Augenheilkunde & augenärztliche Fortbildung : ZPA
Y1  - 2009
SN  - 1436-0322
VL  - Bd. 30
SP  - 169
EP  - 171
ER  - 
TY  - JOUR
A1  - Turaliyeva, M.
A1  - Yeshibaev, A.
A1  - Saparbekova, A.
A1  - Akynova, L.
A1  - Abildayeva, R.
A1  - Sadenova, M.
A1  - Sartayeva, K.
A1  - Schieffer, Andre
A1  - Digel, Ilya
T1  - Species composition and injuriousness of stranger xylophilous fauna affecting indigenous urban dendroflora of Central Asia
JF  - Asian journal of microbiology, biotechnology & environmental sciences : AJMBES
N2  - At the present time, one of the most serious environmental problems of Central Asia and South Kazakhstan is the ongoing large-scale deterioration of principal urban tree populations. Several major centers of massive spread of invasive plant pests have been found in urban dendroflora of this region. The degree of damage of seven most wide-spread aboriginal tree species was found to range from 21.4±1.1 to 85.4±1.8%. In particular, the integrity of the native communities of sycamore (Platanus spp.), willow (Salix spp.), poplar (Populus spp.) and elm (Ulmus spp.) is highly endangered. Our taxonomic analysis of the most dangerous tree pests of the region has revealed them as neobiontic xylophilous insects such as Cossus cossus L. (Order: Lepidoptera L.) Monochamus urussovi Fisch., Monochamus sutor L., Acanthocinus aedelis L. and Ñetonia aureate L. (Order: Coleoptera L.). We relate the origin of this threatening trend with the import of industrial wood in the mid 90’s of the last century that was associated with high degree of the constructional work in the region. Because of the absence of efficient natural predators of the pest species, the application of microbiological methods of the pest control and limitation is suggested.
Y1  - 2016
SN  - 0972-3005
VL  - 18
IS  - 2
SP  - 359
EP  - 366
PB  - EM International
ER  - 
TY  - JOUR
A1  - Grundmann, Jan Thimo
A1  - Dachwald, Bernd
A1  - Grimm, Christian D.
A1  - Kahle, Ralph
A1  - Koch, Aaron Dexter
A1  - Krause, Christian
A1  - Lange, Caroline
A1  - Quantius, Dominik
A1  - Ulamec, Stephan
T1  - Spacecraft for Hypervelocity Impact Research – An Overview of Capabilities, Constraints and the Challenges of Getting There
JF  - Procedia Engineering
Y1  - 2015
U6  - http://dx.doi.org/10.1016/j.proeng.2015.04.021
SN  - 1877-7058
N1  - Proceedings of the 2015 Hypervelocity Impact Symposium (HVIS 2015)
VL  - Vol. 103
SP  - 151
EP  - 158
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - CHAP
A1  - Digel, Ilya
A1  - Temiz Artmann, Aysegül
A1  - Nojima, H.
A1  - Artmann, Gerhard
T1  - Some peculiarities of application of cluster ions generated by plasma in respect of indoor air purification :[abstract]
N2  - Recently, the SHARP Corporation, Japan, has developed the world’s first "Plasma Cluster Ions (PCI)" air purification technology using plasma discharge to generate cluster ions. The new plasma cluster device releases positive and negative ions into the air, which are able to decompose and deactivate harmful airborne substances by chemical reactions. Because cluster ions consist of positive and negative ions that normally exist in the natural world, they are completely harmless and safe to humans. The amount of ozone generated by cluster ions is less than 0.01 ppm, which is significantly less than the 0.05-ppm standard for industrial operations and consumer electronics. This amount, thus, has no harming effects whatsoever on the human body. But particular properties and chemical processes in PCI treatment are still under study. It has been shown that PCI in most cases show strongly pronounced irreversible killing effects in respect of airborne microflora due to free-radical induced reactions and can be considered as a potent technology to disinfect both home, medical and industrial appliances.
KW  - Clusterion
KW  - Raumluft
KW  - Luftreiniger
KW  - Plasmacluster ion technology
KW  - Air purification
Y1  - 2003
ER  - 
TY  - CHAP
A1  - Konstantinidis, K.
A1  - Kowalski, Julia
A1  - Martinez, C. F.
A1  - Dachwald, Bernd
A1  - Ewerhart, D.
A1  - Förstner, R.
T1  - Some necessary technologies for in-situ astrobiology on enceladus
T2  - Proceedings of the International Astronautical Congress
Y1  - 2015
SN  - 978-151081893-4
N1  - 6th International Astronautical Congress 2015: Space - The Gateway for Mankind's Future, IAC 2015; Jerusalem; Israel; 12 October 2015 through 16 October 2015
SP  - 1354
EP  - 1372
ER  - 
TY  - JOUR
A1  - Staat, Manfred
T1  - Some Achievements of the European Project LISA for FEM Based Limit and Shakedown Analysis
JF  - Computational mechanics : developments and applications, 2002 : presented at the 2002 ASME Pressure Vessels and Piping Conference, Vancouver, British Columbia, Canada, August 5 - 9. / Badie, N. [ed]
Y1  - 2002
SN  - 0791846520
N1  - Serie PVP ; vol. 441.
SP  - 177
EP  - 185
PB  - American Society of Mechanical Engineers
CY  - New York
ER  - 
TY  - CHAP
A1  - Peloni, Alessandro
A1  - Ceriotti, Matteo
A1  - Dachwald, Bernd
T1  - Solar-Sailing Trajectory Design for Close-up NEA Observations Mission
T2  - 4th IAA Planetary Defense Conference - PDC 2015, 13-17 April 2015, Frascati, Roma, Italy
Y1  - 2015
N1  - IAA-PDC-15-P-19
ER  - 
TY  - JOUR
A1  - Peloni, Alessandro
A1  - Ceriotti, Matteo
A1  - Dachwald, Bernd
T1  - Solar-sail trajectory design for a multiple near-earth-asteroid rendezvous mission
JF  - Journal of Guidance, Control, and Dynamics
N2  - The scientific interest for near-Earth asteroids as well as the interest in potentially hazardous asteroids from the perspective of planetary defense led the space community to focus on near-Earth asteroid mission studies. A multiple near-Earth asteroid rendezvous mission with close-up observations of several objects can help to improve the characterization of these asteroids. This work explores the design of a solar-sail spacecraft for such a mission, focusing on the search of possible sequences of encounters and the trajectory optimization. This is done in two sequential steps: a sequence search by means of a simplified trajectory model and a set of heuristic rules based on astrodynamics, and a subsequent optimization phase. A shape-based approach for solar sailing has been developed and is used for the first phase. The effectiveness of the proposed approach is demonstrated through a fully optimized multiple near-Earth asteroid rendezvous mission. The results show that it is possible to visit five near-Earth asteroids within 10 years with near-term solar-sail technology.
Y1  - 2016
U6  - http://dx.doi.org/10.2514/1.G000470
SN  - 0731-5090
VL  - 39
IS  - 12
SP  - 2712
EP  - 2724
PB  - AIAA
CY  - Reston, Va.
ER  - 
TY  - JOUR
A1  - Dachwald, Bernd
A1  - Seboldt, W.
T1  - Solar Sails — Propellantless Propulsion for Near- and Medium-Term Deep-Space Missions  / W. Seboldt ; B. Dachwald
JF  - Advanced Propulsion Systems and Technologies, Today to 2020 / Claudio Bruno (ed.) ... - (Progress in Astronautics and Aeronautics Series ; 223)
Y1  - 2008
SN  - 978-1-56347-929-8
N1  - ISBN 10: 1-56347-929-X  ; American Institute of Aeronautics and Astronautics <New York, NY>
PB  - AIAA
CY  - Reston, Va.
ER  - 
TY  - CHAP
A1  - Grundmann, Jan Thimo
A1  - Bauer, Wlademar
A1  - Borchers, Kai
A1  - Dumont, Etienne
A1  - Grimm, Christian D.
A1  - Ho, Tra-Mi
A1  - Jahnke, Rico
A1  - Koch, Aaron D.
A1  - Lange, Caroline
A1  - Maiwald, Volker
A1  - Meß, Jan-Gerd
A1  - Mikulz, Eugen
A1  - Quantius, Dominik
A1  - Reershemius, Siebo
A1  - Renger, Thomas
A1  - Sasaki, Kaname
A1  - Seefeldt, Patric
A1  - Spietz, Peter
A1  - Spröwitz, Tom
A1  - Sznajder, Maciej
A1  - Toth, Norbert
A1  - Ceriotti, Matteo
A1  - McInnes, Colin
A1  - Peloni, Alessandro
A1  - Biele, Jens
A1  - Krause, Christian
A1  - Dachwald, Bernd
A1  - Hercik, David
A1  - Lichtenheldt, Roy
A1  - Wolff, Friederike
A1  - Koncz, Alexander
A1  - Pelivan, Ivanka
A1  - Schmitz, Nicole
A1  - Boden, Ralf
A1  - Riemann, Johannes
A1  - Seboldt, Wolfgang
A1  - Wejmo, Elisabet
A1  - Ziach, Christian
A1  - Mikschl, Tobias
A1  - Montenegro, Sergio
A1  - Ruffer, Michael
A1  - Cordero, Federico
A1  - Tardivel, Simon
T1  - Solar sails for planetary defense & high-energy missions
T2  - IEEE Aerospace Conference Proceedings
N2  - 20 years after the successful ground deployment test of a (20 m) 2 solar sail at DLR Cologne, and in the light of the upcoming U.S. NEAscout mission, we provide an overview of the progress made since in our mission and hardware design studies as well as the hardware built in the course of our solar sail technology development. We outline the most likely and most efficient routes to develop solar sails for useful missions in science and applications, based on our developed `now-term' and near-term hardware as well as the many practical and managerial lessons learned from the DLR-ESTEC Gossamer Roadmap. Mission types directly applicable to planetary defense include single and Multiple NEA Rendezvous ((M)NR) for precursor, monitoring and follow-up scenarios as well as sail-propelled head-on retrograde kinetic impactors (RKI) for mitigation. Other mission types such as the Displaced L1 (DL1) space weather advance warning and monitoring or Solar Polar Orbiter (SPO) types demonstrate the capability of near-term solar sails to achieve asteroid rendezvous in any kind of orbit, from Earth-coorbital to extremely inclined and even retrograde orbits. Some of these mission types such as SPO, (M)NR and RKI include separable payloads. For one-way access to the asteroid surface, nanolanders like MASCOT are an ideal match for solar sails in micro-spacecraft format, i.e. in launch configurations compatible with ESPA and ASAP secondary payload platforms. Larger landers similar to the JAXA-DLR study of a Jupiter Trojan asteroid lander for the OKEANOS mission can shuttle from the sail to the asteroids visited and enable multiple NEA sample-return missions. The high impact velocities and re-try capability achieved by the RKI mission type on a final orbit identical to the target asteroid's but retrograde to its motion enables small spacecraft size impactors to carry sufficient kinetic energy for deflection.
Y1  - 2019
U6  - http://dx.doi.org/10.1109/AERO.2019.8741900
N1  - AERO 2019; Big Sky; United States; 2 March 2019 through 9 March 2019
SP  - 1
EP  - 21
ER  - 
TY  - CHAP
A1  - Seboldt, Wolfgang
A1  - Dachwald, Bernd
T1  - Solar sails for near-term advanced scientific deep space missions
T2  - Proceedings of the 8th International Workshop on Combustion and Propulsion
N2  - Solar sails are propelled in space by reflecting solar photons off large mirroring surfaces, thereby transforming the momentum of the photons into a propulsive force. This innovative concept for low-thrust space propulsion works without any propellant and thus provides a wide range of opportunities for highenergy low-cost missions. Offering an efficient way of propulsion, solar sailcraft could close a gap in transportation options for highly demanding exploration missions within our solar system and even beyond. On December 17th, 1999, a significant step was made towards the realization of this technology: a lightweight solar sail structure with an area of 20 m × 20 m was successfully deployed on ground in a large facility at the German Aerospace Center (DLR) at Cologne. The deployment from a package of 60 cm × 60 cm × 65 cm with a total mass of less than 35 kg was achieved using four extremely light-weight carbon fiber reinforced plastics (CFRP) booms with a specific mass of 100 g/m. The paper briefly reviews the basic principles of solar sails as well as the technical concept and its realization in the ground demonstration experiment, performed in close cooperation between DLR and ESA. Next possible steps are outlined. They could comprise the in-orbit demonstration of the sail deployment on the upper stage of a low-cost rocket and the verification of the propulsion concept by an autonomous and free flying solar sail in the frame of a scientific mission. It is expected that the present design could be extended to sail sizes of about (40 m)2  up to even (70 m)2 without significant mass penalty. With these areas, the maximum achievable thrust at 1 AU would range between 10 and 40 mN – comparable to some electric thrusters. Such prototype sails with a mass between 50 and 150 kg plus a micro-spacecraft of 50 to 250 kg would have a maximum acceleration in the order of 0.1 mm/s2 at 1 AU, corresponding to a maximum ∆V-capability of about 3 km/s per year. Two near/medium-term mission examples to a near-Earth asteroid (NEA) will be discussed: a rendezvous mission
and a sample return mission.
KW  - solar sail
KW  - low-thrust
KW  - near-Earth asteroid
KW  - sample return
KW  - solar system
Y1  - 2003
N1  - Proceedings of the 8th International Workshop on Combustion and Propulsion. Pozzuoli, Italy, 16 - 21 June 2002.
ER  - 
TY  - JOUR
A1  - Dachwald, Bernd
A1  - Seboldt, W.
T1  - Solar Sails for Near- and Medium-Term Scientific Deep Space Missions / W. Sebolt ; B. Dachwald
JF  - In-space propulsion : edited book of proceedings of the 10-IWCP, the 10th International Workshop on Combustion and Propulsion held in Lerici, La Spezia, Italy, 21-25 September 2003 / [ed.: Luigi T. DeLuca]
Y1  - 2005
N1  - Paper 31 ; International workshop on combustion and propulsion <10, 2003, Lerici>
PB  - SP Lab, Politecnico di Milano
CY  - Milano
ER  - 
TY  - JOUR
A1  - Dachwald, Bernd
A1  - Kahle, Ralph
A1  - Wie, Bong
T1  - Solar Sailing Kinetic Energy Impactor (KEI) Mission Design Tradeoffs for Impacting and Deflecting Asteroid 99942 Apophis
JF  - AIAA Guidance, Navigation, and Control Conference & Exhibit - AIAA Atmospheric Flight Mechanics Conference & Exhibit - AIAA Modeling and Simulation Technologies Conference & Exhibit - AIAA/AAS Astrodynamics Specialist Conference & Exhibit : [21 - 24 August 2006, Keystone, Colorado ; papers]. - (AIAA meeting papers on disc ; [11.]2006,19-20 )
Y1  - 2006
SN  - 1-56347-802-1
N1  - American Institute of Aeronautics and Astronautics <Reston, Va.> ; American Astronautical Society ; AIAA/AAS Astrodynamics Specialist Conference & Exhibit <2006,  Keystone, Colo.> ; AIAA paper number: AIAA-2006-6178
SP  - 1
EP  - 20
PB  - American Institute of Aeronautics and Astronautics
CY  - Reston, Va.
ER  - 
TY  - JOUR
A1  - Dachwald, Bernd
A1  - Seboldt, Wolfgang
T1  - Solar sailcraft of the first generation technology development / Seboldt, Wolfgang ; Dachwald, Bernd
Y1  - 2003
N1  - 54th International Astronautical Congress of the International Astronautical Federation, the International Academy of Astronautics, and the International Institute of Space Law 29 September - 3 October 2003, Bremen, Germany IAC-03-S.03
ER  - 
TY  - JOUR
A1  - Dachwald, Bernd
A1  - Seboldt, Wolfgang
T1  - Solar sailcraft of the first generation mission applications to near-earth asteroids
Y1  - 2003
N1  - 54th International Astronautical Congress of the International Astronautical Federation, the International Academy of Astronautics, and the International Institute of Space Law 29 September - 3 October 2003, Bremen, Germany IAC-03-Q.5.06
ER  - 
TY  - JOUR
A1  - Dachwald, Bernd
A1  - Ohndorf, A.
A1  - Wie, Bong
T1  - Solar Sail Trajectory Optimization for the Solar Polar Imager (SPI) Mission
JF  - AIAA Guidance, Navigation, and Control Conference & Exhibit - AIAA Atmospheric Flight Mechanics Conference & Exhibit - AIAA Modeling and Simulation Technologies Conference & Exhibit - AIAA/AAS Astrodynamics Specialist Conference & Exhibit : [21 - 24 August 2006, Keystone, Colorado ; papers]. - (AIAA meeting papers on disc ; [11.]2006,19-20 )
Y1  - 2006
SN  - 1-56347-802-1
N1  - American Institute of Aeronautics and Astronautics <Reston, Va.> ; American Astronautical Society ; AIAA/AAS Astrodynamics Specialist Conference & Exhibit <2006,  Keystone, Colo.> ; AIAA paper number: AIAA-2006-6177
PB  - American Institute of Aeronautics and Astronautics
CY  - Reston, Va.
ER  - 
TY  - JOUR
A1  - Dachwald, Bernd
A1  - Wie, Bong
T1  - Solar Sail Trajectory Optimization for Intercepting, Impacting, and Deflecting Near-Earth Asteroids
JF  - AIAA Guidance, Navigation and Control Conference and Exhibit - AIAA Modeling and Simulation Technologies Conference and Exhibit - AIAA Atmospheric Flight Mechanics Conference and Exhibit : [San Francisco, California, 15 - 18 August 2005 ; papers]. - (AIAA meeting papers on disc ; [10.]2005,16-17)
Y1  - 2005
SN  - 1-56347-765-3
N1  - American Institute of Aeronautics and Astronautics <Reston, Va.> ; AIAA Guidance, Navigation, and Control Conference and Exhibit <2005, San Francisco, Calif.> ; AIAA paper number: AIAA-2006-6176
PB  - American Institute of Aeronautics and Astronautics
CY  - Reston, Va.
ER  - 
TY  - JOUR
A1  - Dachwald, Bernd
A1  - Seboldt, W.
A1  - Lämmerzahl, W.
T1  - Solar Sail Propulsion: An Enabling Technology for Fundamental Physics Missions
JF  - Lasers, Clocks and Drag Free Control : Exploration of Relativistic Gravity in Space / by Hansjörg Dittus ..., eds. - ( Astrophysics and Space Science Library ; 349)
Y1  - 2008
SN  - 978-3-540-34376-9
SP  - 379
EP  - 398
PB  - Springer
CY  - Berlin [u.a.]
ER  - 
TY  - CHAP
A1  - Dachwald, Bernd
T1  - Solar sail performance requirements for missions to the outer solar system and beyond
T2  - 55th International Astronautical Congress 2004
N2  - Solar sails enable missions to the outer solar system and beyond, although the solar
radiation pressure decreases with the square of solar distance. For such missions, the solar sail may gain a large amount of energy by first making one or more close approaches to the sun. Within this paper, optimal trajectories for solar sail missions to the outer planets and into near interstellar space (200 AU) are presented. Thereby, it is shown that even near/medium-term solar sails with relatively moderate performance allow reasonable transfer times to the boundaries of the solar system.
Y1  - 2004
U6  - http://dx.doi.org/10.2514/6.IAC-04-S.P.11
N1  - 55th International Astronautical Congress 2004 - Vancouver, Canada
SP  - 1
EP  - 9
ER  - 
TY  - JOUR
A1  - Dachwald, Bernd
A1  - Wi, Bong
T1  - Solar Sail Kinetic Energy Impactor Trajectory Optimization for an Asteroid-Deflection Mission
JF  - Journal of Spacecraft and Rockets. 44 (2007), H. 4
Y1  - 2007
SN  - 0022-4650
N1  - 2. ISSN: 1533-6794
SP  - 755
EP  - 764
ER  - 
TY  - CHAP
A1  - Dachwald, Bernd
A1  - Kahle, Ralph
A1  - Wie, Bong
T1  - Solar sail Kinetic Energy Impactor (KEI) mission design tradeoffs for impacting and deflecting asteroid 99942 Apophis
T2  - AIAA/AAS Astrodynamics Specialist Conference and Exhibit
N2  - Near-Earth asteroid 99942 Apophis provides a typical example for the evolution of asteroid orbits that lead to Earth-impacts after a close Earth-encounter that results in a resonant return. Apophis will have a close Earth-encounter in 2029 with potential very close subsequent Earth-encounters (or even an impact) in 2036 or later, depending on whether it passes through one of several so-called gravitational keyholes during its 2029-encounter. Several pre-2029-deflection scenarios to prevent Apophis from doing this have been investigated so far. Because the keyholes are less than 1 km in size, a pre-2029 kinetic impact is clearly the best option because it requires only a small change in Apophis' orbit to nudge it out of a keyhole. A single solar sail Kinetic Energy Impactor (KEI) spacecraft that impacts Apophis from a retrograde trajectory with a very high relative velocity (75-80 km/s) during one of its perihelion passages at about 0.75 AU would be a feasible option to do this. The spacecraft consists of a 160 m x 160 m, 168 kg solar sail assembly and a 150 kg impactor. Although conventional spacecraft can also achieve the required minimum deflection of 1 km for this approx. 320 m-sized object from a prograde trajectory, our solar sail KEI concept also allows the deflection of larger objects. In this paper, we also show that, even after Apophis has flown through one of the gravitational keyholes in 2029, solar sail Kinetic Energy Impactor (KEI) spacecraft are still a feasible option to prevent Apophis from impacting the Earth, but many KEIs would be required for consecutive impacts to increase the total Earth-miss distance to a safe value. In this paper, we elaborate potential pre- and post-2029 KEI impact scenarios for a launch in 2020, and investigate tradeoffs between different mission parameters.
KW  - Solar Sail
KW  - Asteroid Deflection
KW  - Planetary Protection
KW  - Trajectory Optimization
Y1  - 2006
U6  - http://dx.doi.org/10.2514/6.2006-6178
N1  - AIAA/AAS Astrodynamics Specialist Conference and Exhibit, 21 August 2006 - 24 August 2006, Keystone, Colorado(USA).
SP  - 1
EP  - 20
ER  - 
TY  - CHAP
A1  - Dachwald, Bernd
T1  - Solar sail dynamics and control
T2  - Encyclopedia of Aerospace Engineering
N2  - Solar sails are large and lightweight reflective structures that are propelled by solar radiation pressure. This chapter covers their orbital and attitude dynamics and control. First, the advantages and limitations of solar sails are discussed and their history and development status is outlined. Because the dynamics of solar sails is governed by the (thermo-)optical properties of the sail film, the basic solar radiation pressure force models have to be described and compared before parameters to measure solar sail performance can be defined. The next part covers the orbital dynamics of solar sails for heliocentric motion, planetocentric motion, and motion at Lagrangian equilibrium points. Afterwards, some advanced solar radiation pressure force models are described, which allow to quantify the thrust force on solar sails of arbitrary shape, the effects of temperature, of light incidence angle, of surface roughness, and the effects of optical degradation of the sail film in the space environment. The orbital motion of a solar sail is strongly coupled to its rotational motion, so that the attitude control of these soft and flexible structures is very challenging, especially for planetocentric orbits that require fast attitude maneuvers. Finally, some potential attitude control methods are sketched and selection criteria are given.
KW  - solar sail
KW  - sailcraft
KW  - orbital dynamics
KW  - orbit control
KW  - attitude dynamics
Y1  - 2010
U6  - http://dx.doi.org/10.1002/9780470686652.eae292
PB  - Wiley
CY  - Hoboken
ER  - 
TY  - CHAP
A1  - Grundmann, Jan Thimo
A1  - Boden, Ralf
A1  - Ceriotti, Matteo
A1  - Dachwald, Bernd
A1  - Dumont, Etienne
A1  - Grimm, Christian D.
A1  - Lange, Caroline
A1  - Lichtenheldt, Roy
A1  - Pelivan, Ivanka
A1  - Peloni, Alessandro
A1  - Riemann, Johannes
A1  - Spröwitz, Tom
A1  - Tardivel, Simon
T1  - Soil to sail-asteroid landers on near-term sailcraft as an evolution of the GOSSAMER small spacecraft solar sail concept for in-situ characterization
T2  - 5th IAA Planetary Defense Conference
KW  - multiple NEA rendezvous
KW  - solar sail
KW  - GOSSAMER-1
KW  - MASCOT
KW  - asteroid sample return
Y1  - 2017
N1  - 5th IAA Planetary Defense Conference – PDC 2017
15-19 May 2017, Tokyo, Japan
ER  - 
TY  - JOUR
A1  - Staat, Manfred
A1  - Baroud, G.
A1  - Topcu, M.
A1  - Sponagel, Stefan
T1  - Soft Materials in Technology and Biology – Characteristics, Properties, and Parameter Identification
JF  - Bioengineering in Cell and Tissue Research / Artmann, Gerhard M. ; Chien, Shu (Eds.)
Y1  - 2008
SN  - 978-3-540-75408-4
SP  - 253
EP  - 315
PB  - Springer
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Staat, Manfred
A1  - Duong, Minh Tuan
T1  - Smoothed Finite Element Methods for Nonlinear Solid Mechanics Problems: 2D and 3D Case Studies
T2  - Proceedings of the National Science and Technology Conference on Mechanical - Transportation Engineering (NSCMET 2016), 13th October 2016, Hanoi, Vietnam, Vol.2
N2  - The Smoothed Finite Element Method (SFEM) is presented as an edge-based and a facebased techniques for 2D and 3D boundary value problems, respectively. SFEMs avoid shortcomings of the standard Finite Element Method (FEM) with lower order elements such as overly stiff behavior, poor stress solution, and locking effects. Based on the idea of averaging spatially the standard strain field of the FEM over so-called smoothing domains SFEM calculates the stiffness matrix for the same number of degrees of freedom (DOFs) as those of the FEM. However, the SFEMs significantly improve accuracy and convergence even for distorted meshes and/or nearly incompressible materials.
Numerical results of the SFEMs for a cardiac tissue membrane (thin plate inflation) and an artery (tension of 3D tube) show clearly their advantageous properties in improving accuracy particularly for the distorted meshes and avoiding shear locking effects.
Y1  - 2016
SP  - 440
EP  - 445
ER  - 
TY  - CHAP
A1  - Grundmann, Jan Thimo
A1  - Bauer, Waldemar
A1  - Borchers, Kai
A1  - Dumont, Etienne
A1  - Grimm, Christian D.
A1  - Ho, Tra-Mi
A1  - Jahnke, Rico
A1  - Lange, Caroline
A1  - Maiwald, Volker
A1  - Mikulz, Eugen
A1  - Quantius, Dominik
A1  - Reershemius, Siebo
A1  - Renger, Thomas
A1  - Riemann, Johannes
A1  - Sasaki, Kaname
A1  - Seefeldt, Patric
A1  - Spietz, Peter
A1  - Spröwitz, Tom
A1  - Toth, Norbert
A1  - Wejmo, Elisabet
A1  - Biele, Jens
A1  - Krause, Christian
A1  - Cerotti, Matteo
A1  - Peloni, Alessandro
A1  - Dachwald, Bernd
T1  - Small Spacecraft Solar Sailing for Small Solar System Body Multiple Rendezvous and Landing
T2  - 2018 IEEE Aerospace Conference : 3-10 March 2018
Y1  - 2018
SN  - 978-1-5386-2014-4
ER  - 
TY  - CHAP
A1  - Grundmann, Jan Thimo
A1  - Meß, Jan-Gerd
A1  - Biele, Jens
A1  - Seefeldt, Patric
A1  - Dachwald, Bernd
A1  - Spietz, Peter
A1  - Grimm, Christian D.
A1  - Spröwitz, Tom
A1  - Lange, Caroline
A1  - Ulamec, Stephan
T1  - Small spacecraft in small solar system body applications
T2  - IEEE Aerospace Conference 2017, Big Sky, Montana, USA
Y1  - 2017
SN  - 978-1-5090-1613-6
U6  - http://dx.doi.org/10.1109/AERO.2017.7943626
SP  - 1
EP  - 20
ER  - 
TY  - CHAP
A1  - Grundmann, Jan Thimo
A1  - Lange, Caroline
A1  - Dachwald, Bernd
A1  - Grimm, Christian
A1  - Koch, Aaron
A1  - Ulamec, Stephan
T1  - Small Spacecraft in Planetary Defence Related Applications–Capabilities, Constraints, Challenges
T2  - IEEE Aerospace Conference
N2  - In this paper we present an overview of the characteristics and peculiarities of small spacecraft missions related to planetary defence applications. We provide a brief overview of small spacecraft missions to small solar system bodies. On this background we present recent missions and selected projects and related studies at the German Aerospace Center, DLR, that contribute to planetary defence related activities. These range from Earth orbit technology demonstrators to active science missions in interplanetary space. We provide a summary of experience from recently flown missions with DLR participation as well as a number of studies. These include PHILAE, the lander recently arrived on comet 67P/Churyumov-Gerasimenko aboard ESA’s ROSETTA comet rendezvous mission, and the Mobile Asteroid Surface Scout, MASCOT, now underway to near-Earth asteroid (162173) 1999 JU3 aboard the Japanese sample-return probe HAYABUSA-2. We introduce the differences between the conventional methods employed in the design, integration and testing of large spacecraft and the new approaches developed by small spacecraft projects. We expect that the practical experience that can be gained from projects on extremely
compressed timelines or with high-intensity operation phases on a newly explored small solar system body can contribute significantly to the study, preparation and realization of future planetary defence related missions. One is AIDA (Asteroid Impact & Deflection Assessment), a joint effort of ESA,JHU/APL, NASA, OCA and DLR, combining JHU/APL’s DART (Double Asteroid Redirection Test) and ESA’s AIM (Asteroid Impact Monitor) spacecraft in a mission towards
near-Eath binary asteroid (65803) Didymos.
KW  - small spacecraft
KW  - planetary defence
KW  - asteroid lander
KW  - solar sail
KW  - flotilla missions
Y1  - 2015
N1  - 2015 IEEE Aerospace Conference, 7.-13. Mar. 2015, Big Sky, Montana, USA.
SP  - 1
EP  - 18
ER  - 
TY  - CHAP
A1  - Grundmann, Jan Thimo
A1  - Biele, Jens
A1  - Dachwald, Bernd
A1  - Grimm, Christian
A1  - Lange, Caroline
A1  - Ulamec, Stephan
T1  - Small spacecraft for small solar system body science, planetary defence and applications
T2  - IEEE Aerospace Conference 2016
N2  - Following the recent successful landings and occasional re-awakenings of PHILAE, the lander carried aboard ROSETTA to comet 67P/Churyumov-Gerasimenko, and the launch of the Mobile Asteroid Surface Scout, MASCOT, aboard the HAYABUSA2 space probe to asteroid (162173) Ryugu we present an overview of the characteristics and peculiarities of small spacecraft missions to small solar system bodies (SSSB). Their main purpose is planetary science which is transitioning from a ‘pure’ science of observation of the distant to one also supporting in-situ applications relevant for life on Earth. Here we focus on missions at the interface of SSSB science and planetary defence applications. We provide a brief overview of small spacecraft SSSB missions and on this background present recent missions, projects and related studies at the German Aerospace Center, DLR, that contribute to the worldwide planetary defence community. These range from Earth orbit technology demonstrators to active science missions in interplanetary space. We provide a summary of experience from recently flown missions with DLR participation as well as a number of studies. These include PHILAE, the lander of ESA’s ROSETTA comet rendezvous mission now on the surface of comet 67P/Churyumov-Gerasimenko, and the Mobile Asteroid Surface Scout, MASCOT, now in cruise to the ~1 km diameter C-type near-Earth asteroid (162173) Ryugu aboard the Japanese sample-return probe HAYABUSA2. We introduce the differences between the conventional methods employed in the design, integration and testing of large spacecraft and the new approaches developed by small spacecraft projects. We expect that the practical experience that can be gained from projects on extremely compressed timelines or with high-intensity operation phases on a newly explored small solar system body can contribute significantly to the study, preparation and realization of future planetary defence related missions. One is AIDA (Asteroid Impact & Deflection Assessment), a joint effort of ESA, JHU/APL, NASA, OCA and DLR, combining JHU/APL’s DART (Double Asteroid Redirection Test) and ESA’s AIM (Asteroid Impact Monitor) spacecraft in a mission towards near-Earth binary asteroid system (65803) Didymos. DLR is currently applying MASCOT heritage and lessons learned to the design of MASCOT2, a lander for the AIM mission to support a bistatic low frequency radar experiment with PHILAE/ROSETTA CONSERT heritage to explore the inner structure of Didymoon which is the designated impact target for DART.
Y1  - 2016
SP  - 1
EP  - 20
ER  - 
TY  - CHAP
A1  - Grundmann, Jan Thimo
A1  - Bauer, Waldemar
A1  - Biele, Jens
A1  - Boden, Ralf
A1  - Ceriotti, Matteo
A1  - Cordero, Federico
A1  - Dachwald, Bernd
A1  - Dumont, Etienne
A1  - Grimm, Christian D.
A1  - Herčík, David
A1  - Ho, Tra-Mi
A1  - Jahnke, Rico
A1  - Koch, Aaron D
A1  - Koncz, Alexander
A1  - Krause, Christian
A1  - Lange, Caroline
A1  - Lichtenheldt, Roy
A1  - Maiwald, Volker
A1  - Mikschl, Tobias
A1  - Mikulz, Eugen
A1  - Montenegro, Sergio
A1  - Pelivan, Ivanka
A1  - Peloni, Alessandro
A1  - Quantius, Dominik
A1  - Reershemius, Siebo
A1  - Renger, Thomas
A1  - Riemann, Johannes
A1  - Ruffer, Michael
A1  - Sasaki, Kaname
A1  - Schmitz, Nicole
A1  - Seboldt, Wolfgang
A1  - Seefeldt, Patric
A1  - Spietz, Peter
A1  - Spröwitz, Tom
A1  - Sznajder, Maciej
A1  - Tardivel, Simon
A1  - Tóth, Norbert
A1  - Wejmo, Elisabet
A1  - Wolff, Friederike
A1  - Ziach, Christian
T1  - Small spacecraft based multiple near-earth asteroid rendezvous and landing with near-term solar sails and ‘Now-Term ‘technologies
T2  - 69 th International Astronautical Congress (IAC)
N2  - Physical interaction with small solar system bodies (SSSB) is the next step in planetary science, planetary in-situ resource utilization (ISRU), and planetary defense (PD). It requires a broader understanding of the surface properties of the target objects, with particular interest focused on those near Earth. Knowledge of composition, multi-scale surface structure, thermal response, and interior structure is required to design, validate and operate missions addressing these three fields. The current level of understanding is occasionally simplified into the phrase, ”If you’ve seen one asteroid, you’ve seen one asteroid”, meaning that the in-situ characterization of SSSBs has yet to cross the threshold towards a robust and stable scheme of classification. This would enable generic features in spacecraft design, particularly for ISRU and science missions. Currently, it is necessary to characterize any potential target object sufficiently by a dedicated pre-cursor mission to design the mission which then interacts with the object in a complex fashion. To open up strategic approaches, much broader in-depth characterization of potential target objects would be highly desirable. In SSSB science missions, MASCOT-like nano-landers and instrument carriers which integrate at the instrument level to their mothership have met interest. By its size, MASCOT is compatible with small interplanetary missions. The DLR-ESTEC Gossamer Roadmap Science Working Groups‘ studies identified Multiple Near-Earth asteroid (NEA) Rendezvous (MNR) as one of the space science missions only feasible with solar sail propulsion. The Solar Polar Orbiter (SPO) study showed the ability to access any inclination, theDisplaced-L1 (DL1) mission operates close to Earth, where objects of interest to PD and for ISRU reside. Other studies outline the unique capability of solar sails to provide access to all SSSB, at least within the orbit of Jupiter, and significant progress has been made to explore the performance envelope of near-term solar sails for MNR. However, it is difficult for
sailcraft to interact physically with a SSSB. We expand and extend the philosophy of the recently qualified DLR Gossamer solar sail deployment technology using efficient multiple sub-spacecraft integration to also include landers for one-way in-situ investigations and sample-return missions by synergetic integration and operation of sail and lander. The MASCOT design concept and its characteristic features have created an ideal counterpart for thisand has already been adapted to the needs of the AIM spacecraft, former part of the NASA-ESA AIDA missionDesigning the 69th International Astronautical Congress (IAC), Bremen, Germany, 1-5 October 2018. IAC-18-F1.2.3 Page 2 of 17 combined spacecraft for piggy-back launch accommodation enables low-cost massively parallel access to the NEA population.
KW  - multiple NEA rendezvous
KW  - solar sail
KW  - GOSSAMER-1
KW  - MASCOT
KW  - small spacecraft
Y1  - 2018
N1  - 69th International Astronautical Congress (IAC), Bremen, Germany, 1-5 October 2018.
https://www.bho-legal.com/1-5-october-2018-69th-international-astronautical-congress-2018-in-bremen-germany/
SP  - 1
EP  - 18
ER  - 
TY  - CHAP
A1  - Grundmann, Jan Thimo
A1  - Biele, Jens
A1  - Dachwald, Bernd
A1  - Grimm, Christian D.
A1  - Lange, Caroline
A1  - Ulamec, Stephan
A1  - Ziach, Christian
A1  - Spröwitz, Tom
A1  - Ruffer, Michael
A1  - Seefeldt, Patric
A1  - Spietz, Peter
A1  - Toth, Norbert
A1  - Mimasu, Yuya
A1  - Rittweger, Andreas
A1  - Bibring, Jean-Pierre
A1  - Braukhane, Andy
A1  - Boden, Ralf Christian
A1  - Dumont, Etienne
A1  - Jahnke, Stephan Siegfried
A1  - Jetzschmann, Michael
A1  - Krüger, Hans
A1  - Lange, Michael
A1  - Gomez, Antonio Martelo
A1  - Massonett, Didier
A1  - Okada, Tatsuaki
A1  - Sagliano, Marco
A1  - Sasaki, Kaname
A1  - Schröder, Silvio
A1  - Sippel, Martin
A1  - Skoczylas, Thomas
A1  - Wejmo, Elisabet
T1  - Small landers and separable sub-spacecraft for near-term solar sails
T2  - The Fourth International Symposium on Solar Sailing 2017
N2  - Following the successful PHILAE landing with ESA's ROSETTA probe and the launch of the MINERVA rovers and the Mobile Asteroid Surface Scout, MASCOT, aboard the JAXA space probe, HAYABUSA2, to asteroid (162173) Ryugu, small landers have found increasing interest. Integrated at the instrument level in their mothership they support small solar system body studies. With efficient capabilities, resource-friendly design and inherent robustness they are an attractive exploration mission element. We discuss advantages and constraints of small sub-spacecraft, focusing on emerging areas of activity such as asteroid diversity studies, planetary defence, and asteroid mining, on the background of our projects PHILAE, MASCOT, MASCOT2, the JAXA-DLR Solar Power Sail Lander Design Study, and others. The GOSSAMER-1 solar sail deployment concept also involves independent separable sub-spacecraft operating synchronized to deploy the sail. Small spacecraft require big changes in the way we do things and occasionally a little more effort than would be anticipated based on a traditional large spacecraft approach. In a Constraints-Driven Engineering environment we apply Concurrent Design and Engineering (CD/CE), Concurrent Assembly, Integration and Verification (CAIV) and Model-Based Systems Engineering (MBSE). Near-term solar sails will likely be small spacecraft which we expect to harmonize well with nano-scale separable instrument payload packages.
KW  - Small Solar System Body Lander
KW  - Small Spacecraft
KW  - PHILAE
KW  - MASCOT
KW  - Solar Power Sail
Y1  - 2017
N1  - The Fourth International Symposium on Solar Sailing 2017, 17-20 January 2017. Kyoto Research Park, Kyoto, Japan
SP  - 1
EP  - 10
ER  - 
TY  - CHAP
A1  - Kolditz, Melanie
A1  - Albin, Thivaharan
A1  - Fasse, Alessandro
A1  - Brüggemann, Gert-Peter
A1  - Abel, Dirk
A1  - Albracht, Kirsten
T1  - Simulative Analysis of Joint Loading During Leg Press Exercise for Control Applications
T2  - IFAC-PapersOnLine
Y1  - 2015
U6  - http://dx.doi.org/10.1016/j.ifacol.2015.10.179
N1  - IFAC-PapersOnLine 48-20;
Conference Paper Archive
VL  - 48
IS  - 20
SP  - 435
EP  - 440
ER  - 
TY  - CHAP
A1  - Behbahani, Mehdi
A1  - Rible, Sebastian
A1  - Moulinec, Charles
A1  - Fournier, Yvan
A1  - Nicolai, Mike
A1  - Crosetto, Paolo
T1  - Simulation of the FDA Centrifugal Blood Pump Using High Performance Computing
T2  - World Academy of Science, Engineering and Technology International Journal of Mechanical and Mechatronics Engineering
Y1  - 2015
VL  - 9
IS  - 5
ER  -