@phdthesis{Albracht2010, author = {Albracht, Kirsten}, title = {Influence of mechanical properties of the leg extensor muscletendon units on running economy}, publisher = {Deutsche Sporthochschule K{\"o}ln}, address = {K{\"o}ln}, pages = {X, 1221 Bl. : graph. Darst.}, year = {2010}, language = {en} } @inproceedings{BorggraefeDachwald2010, author = {Borggr{\"a}fe, Andreas and Dachwald, Bernd}, title = {Mission performance evaluation for solar sails using a refined SRP force model with variable optical coefficients}, series = {2nd International Symposium on Solar Sailing}, booktitle = {2nd International Symposium on Solar Sailing}, pages = {1 -- 6}, year = {2010}, abstract = {Solar sails provide ignificant advantages over other low-thrust propulsion systems because they produce thrust by the momentum exchange from solar radiation pressure (SRP) and thus do not consume any propellant.The force exerted on a very thin sail foil basically depends on the light incidence angle. Several analytical SRP force models that describe the SRP force acting on the sail have been established since the 1970s. All the widely used models use constant optical force coefficients of the reflecting sail material. In 2006,MENGALI et al. proposed a refined SRP force model that takes into account the dependancy of the force coefficients on the light incident angle,the sail's distance from the sun (and thus the sail emperature) and the surface roughness of the sail material [1]. In this paper, the refined SRP force model is compared to the previous ones in order to identify the potential impact of the new model on the predicted capabilities of solar sails in performing low-cost interplanetary space missions. All force models have been implemented within InTrance, a global low-thrust trajectory optimization software utilizing evolutionary neurocontrol [2]. Two interplanetary rendezvous missions, to Mercury and the near-Earth asteroid 1996FG3, are investigated. Two solar sail performances in terms of characteristic acceleration are examined for both scenarios, 0.2 mm/s2 and 0.5 mm/s2, termed "low" and "medium" sail performance. In case of the refined SRP model, three different values of surface roughness are chosen, h = 0 nm, 10 nm and 25 nm. The results show that the refined SRP force model yields shorter transfer times than the standard model.}, language = {en} } @incollection{Dachwald2010, author = {Dachwald, Bernd}, title = {Solar sail dynamics and control}, series = {Encyclopedia of Aerospace Engineering}, booktitle = {Encyclopedia of Aerospace Engineering}, publisher = {Wiley}, address = {Hoboken}, doi = {10.1002/9780470686652.eae292}, year = {2010}, abstract = {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.}, language = {en} } @article{AkimbekovZhubanovaMansurovetal.2010, author = {Akimbekov, N. Sh. and Zhubanova, A. A. and Mansurov, Z. A. and Digel, Ilya and Artmann, Gerhard and Temiz Artmann, Ayseg{\"u}l}, title = {Use of Carbonized Rise Shell for the local treatment of wounds}, series = {Eurasian ChemTech Journal}, volume = {12}, journal = {Eurasian ChemTech Journal}, number = {2}, publisher = {Institute of Combustion Problems}, address = {Almaty}, issn = {2522-4867}, doi = {10.18321/ectj35}, pages = {133 -- 138}, year = {2010}, abstract = {On the model of musculocutaneous wound in rats, the effect of applicative sorption by carbonized rise shell (CRS) on the healing of festering wound was studied. It has been shown, that cytological changes end with rapid scar formation. The use of CRS at the period of severe purulent wound contributes to its favorable course, prevents the development of complications of the animals from sepsis.}, language = {en} } @article{AggeloussisGiannakouAlbrachtetal.2010, author = {Aggeloussis, Nickos and Giannakou, Erasmia and Albracht, Kirsten and Arampatzis, Adamantios}, title = {Reproducibility of fascicle length and pennation angle of gastrocnemius medialis in human gait in vivo}, series = {Gait and Posture}, volume = {31}, journal = {Gait and Posture}, number = {1}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0966-6362}, doi = {10.1016/j.gaitpost.2009.08.249}, pages = {73 -- 77}, year = {2010}, abstract = {The purpose of the current study was to examine the reproducibility of fascicle length and pennation angle of gastrocnemius medialis while human walking. To the best of our knowledge, this is the first study of the reproducibility of fascicle length and pennation angle of gastrocnemius medialis in vivo during human gait. Twelve males performed 10 gait trials on a treadmill, in 2 separate days. B-mode ultrasonography, with the ultrasound probe firmly adjusted in the transverse and frontal planes using a special cast, was used to measure the fascicle length and the pennation angle of the gastrocnemius medialis (GM). A Vicon 624 system with three cameras operating at 120 Hz was also used to record the ankle and knee joint angles. The results showed that measurements of fascicle length and pennation angle showed high reproducibility during the gait cycle, both within the same day and between different days. Moreover, the root mean square differences between the repeated waveforms of both variables were very small, compared with their ranges (fascicle length: RMS = ∼3 mm, range: 38-63 mm; pennation angle: RMS = ∼1.5°, range: 22-32°). However, their reproducibility was lower compared to the joint angles. It was found that representative data have to be derived by a wide number of gait trials (fascicle length ∼six trials, pennation angle more than 10 trials), to assure the reliability of the fascicle length and pennation angle in human gait.}, language = {en} } @article{ArampatzisPeperBierbaumetal.2010, author = {Arampatzis, Adamantios and Peper, Andreas and Bierbaum, Stefanie and Albracht, Kirsten}, title = {Plasticity of human Achilles tendon mechanical and morphological properties in response to cyclic strain}, series = {Journal of Biomechanics}, volume = {43}, journal = {Journal of Biomechanics}, number = {16}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0021-9290}, doi = {10.1016/j.jbiomech.2010.08.014}, pages = {3073 -- 3079}, year = {2010}, abstract = {The purpose of the current study in combination with our previous published data (Arampatzis et al., 2007) was to examine the effects of a controlled modulation of strain magnitude and strain frequency applied to the Achilles tendon on the plasticity of tendon mechanical and morphological properties. Eleven male adults (23.9±2.2 yr) participated in the study. The participants exercised one leg at low magnitude tendon strain (2.97±0.47\%), and the other leg at high tendon strain magnitude (4.72±1.08\%) of similar frequency (0.5 Hz, 1 s loading, 1 s relaxation) and exercise volume (integral of the plantar flexion moment over time) for 14 weeks, 4 days per week, 5 sets per session. The exercise volume was similar to the intervention of our earlier study (0.17 Hz frequency; 3 s loading, 3 s relaxation) allowing a direct comparison of the results. Before and after the intervention ankle joint moment has been measured by a dynamometer, tendon-aponeurosis elongation by ultrasound and cross-sectional area of the Achilles tendon by magnet resonance images (MRI). We found a decrease in strain at a given tendon force, an increase in tendon-aponeurosis stiffness and tendon elastic modulus of the Achilles tendon only in the leg exercised at high strain magnitude. The cross-sectional area (CSA) of the Achilles tendon did not show any statistically significant (P>0.05) differences to the pre-exercise values in both legs. The results indicate a superior improvement in tendon properties (stiffness, elastic modulus and CSA) at the low frequency (0.17 Hz) compared to the high strain frequency (0.5 Hz) protocol. These findings provide evidence that the strain magnitude applied to the Achilles tendon should exceed the value, which occurs during habitual activities to trigger adaptational effects and that higher tendon strain duration per contraction leads to superior tendon adaptational responses.}, language = {en} } @article{KozhalakovaZhubanovaMansurovetal.2010, author = {Kozhalakova, A. A. and Zhubanova, Azhar A. and Mansurov, Z. A. and Digel, Ilya and Tazhibayeva, S. M. and Artmann, Gerhard and Temiz Artmann, Ayseg{\"u}l}, title = {Adsorption of bacterial lipopolysaccharides on carbonized rice shell}, series = {Science of Central Asia (2010)}, journal = {Science of Central Asia (2010)}, pages = {50 -- 54}, year = {2010}, language = {en} } @article{Digel2010, author = {Digel, Ilya}, title = {In-situ biological decontamination of an ice melting probe}, year = {2010}, language = {en} } @article{KurzLinderTrzewiketal.2010, author = {Kurz, R. and Linder, Peter and Trzewik, J{\"u}rgen and R{\"u}ffer, M. and Artmann, Gerhard and Digel, Ilya and Rothermel, A. and Robitzki, A. and Temiz Artmann, Ayseg{\"u}l}, title = {Contractile tension and beating rates of self-exciting monolayers and 3D-tissue constructs of neonatal rat cardiomyocytes}, series = {Medical and Biological Engineering and Computing}, volume = {48}, journal = {Medical and Biological Engineering and Computing}, number = {1}, publisher = {Springer Nature}, address = {Cham}, issn = {1741-0444}, doi = {10.1007/s11517-009-0552-y}, pages = {59 -- 65}, year = {2010}, abstract = {The CellDrum technology (The term 'CellDrum technology' includes a couple of slightly different technological setups for measuring lateral mechanical tension in various types of cell monolayers or 3D-tissue constructs) was designed to quantify the contraction rate and mechanical tension of self-exciting cardiac myocytes. Cells were grown either within flexible, circular collagen gels or as monolayer on top of respective 1-mum thin silicone membranes. Membrane and cells were bulged outwards by air pressure. This biaxial strain distribution is rather similar the beating, blood-filled heart. The setup allowed presetting the mechanical residual stress level externally by adjusting the centre deflection, thus, mimicking hypertension in vitro. Tension was measured as oscillating differential pressure change between chamber and environment. A 0.5-mm thick collagen-cardiac myocyte tissue construct induced after 2 days of culturing (initial cell density 2 x 10(4) cells/ml), a mechanical tension of 1.62 +/- 0.17 microN/mm(2). Mechanical load is an important growth regulator in the developing heart, and the orientation and alignment of cardiomyocytes is stress sensitive. Therefore, it was necessary to develop the CellDrum technology with its biaxial stress-strain distribution and defined mechanical boundary conditions. Cells were exposed to strain in two directions, radially and circumferentially, which is similar to biaxial loading in real heart tissues. Thus, from a biomechanical point of view, the system is preferable to previous setups based on uniaxial stretching.}, language = {en} } @article{GarhoferBekBoehmetal.2010, author = {Garhofer, Gerhard and Bek, Toke and Boehm, Andreas G. and Gherghel, Doina and Grundwald, Juan and Jeppesen, Peter and Kergoat, H{\´e}l{\`e}ne and Kotliar, Konstantin and Lanzl, Ines and Lovasik, John V. and Nagel, Edgar and Vilser, Walthard and Orgul, Selim and Schmetterer, Leopold}, title = {Use of the retinal vessel analyzer in ocular blood flow research}, series = {Acta Ophthalmol}, volume = {88}, journal = {Acta Ophthalmol}, number = {7}, publisher = {Wiley-Blackwell}, address = {Oxford}, issn = {1755-3768}, doi = {10.1111/j.1755-3768.2009.01587.x}, pages = {717 -- 722}, year = {2010}, abstract = {The present article describes a standard instrument for the continuous online determination of retinal vessel diameters, the commercially available retinal vessel analyzer. This report is intended to provide informed guidelines for measuring ocular blood flow with this system. The report describes the principles underlying the method and the instruments currently available, and discusses clinical protocol and the specific parameters measured by the system. Unresolved questions and the possible limitations of the technique are also discussed.}, language = {en} } @article{PresslerEsefeldScherretal.2010, author = {Pressler, Axel and Esefeld, Katrin and Scherr, Johannes and Ali, Mohammad and Hanssen, Henner and Kotliar, Konstantin and Lanzl, Ines and Halle, Martin and Kaemmerer, Harald and Schmidt-Trucks{\"a}ss, Arno and Hager, Alfred}, title = {Structural alterations of retinal arterioles in adults late after repair of aortic isthmic coarctation}, series = {The American Journal of Cardiology}, volume = {105}, journal = {The American Journal of Cardiology}, number = {5}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0002-9149}, doi = {10.1016/j.amjcard.2009.10.070}, pages = {740 -- 744}, year = {2010}, abstract = {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.}, language = {en} } @article{KotliarNagelVilseretal.2010, author = {Kotliar, Konstantin and Nagel, Edgar and Vilser, Walthard and Seidova, Seid-Fatima and Lanzl, Ines}, title = {Microstructural alterations of retinal arterial blood column along the vessel axis in systemic hypertension}, series = {Investigative Ophthalmology \& Visual Science, IOVS}, volume = {51}, journal = {Investigative Ophthalmology \& Visual Science, IOVS}, number = {4}, publisher = {ARVO}, address = {Rockville, Md.}, issn = {0146-0404}, doi = {10.1167/iovs.09-3649}, pages = {2165 -- 2172}, year = {2010}, abstract = {Purpose: Image analysis by the retinal vessel analyzer (RVA) observes retinal vessels in their dynamic state online noninvasively along a chosen vessel segment. It has been found that high-frequency diameter changes in the retinal artery blood column along the vessel increase significantly in anamnestically healthy volunteers with increasing age and in patients with glaucoma during vascular dilation. This study was undertaken to investigate whether longitudinal sections of the retinal artery blood column are altered in systemic hypertension. Methods: Retinal arteries of 15 untreated patients with essential arterial hypertension (age, 50.9 ± 11.9 years) and of 15 age-matched anamnestically healthy volunteers were examined by RVA. After baseline assessment, a monochromatic luminance flicker (530-600 nm; 12.5 Hz; 20 s) was applied to evoke retinal vasodilation. Differences in amplitude and frequency of spatial artery blood column diameter change along segments (longitudinal arterial profiles) of 1 mm in length were measured and analyzed using Fourier transformation. Results: In the control group, average reduced power spectra (ARPS) of longitudinal arterial profiles did not differ when arteries changed from constriction to dilation. In the systemic hypertension group, ARPS during constriction, baseline, and restoration were identical and differed from ARPS during dilation (P < 0.05). Longitudinal arterial profiles in both groups showed significant dissimilitude at baseline and restoration (P < 0.05). Conclusions: The retinal artery blood column demonstrates microstructural alterations in systemic hypertension and is less irregular along the vessel axis during vessel dilation. These microstructural changes may be an indication of alterations in vessel wall rigidity, vascular endothelial function, and smooth muscle cells in this disease, leading to impaired perfusion and regulation.}, language = {en} } @inproceedings{ArinkinDigel2009, author = {Arinkin, Vladimir and Digel, Ilya}, title = {Water bridge phenomenon : [abstract]}, year = {2009}, abstract = {One of interesting but not well known water properties is related to appearance of highly ordered structures in response to strong electrical field. In 1893 Sir William Armstrong placed a cotton thread between two wine glasses filled with chemically pure water. When high DC voltage was applied between the glasses, a connection consisting of water formed, producing a "water bridge"}, subject = {Hydrodynamik}, language = {en} } @inproceedings{ElBashirDigel2009, author = {ElBashir, Rasha and Digel, Ilya}, title = {Effect of nitric oxide gas on hydrogels : [abstract]}, year = {2009}, abstract = {The results support our theory that the NO gas has an influence in increasing the translational diffusion of hydrogels and it accelerates the melting process of the gels.}, subject = {Stickstoffmonoxid}, language = {en} } @inproceedings{O'HerasDigelTemizArtmann2009, author = {O\'Heras, Carlos and Digel, Ilya and Temiz Artmann, Ayseg{\"u}l}, title = {Nanostructured carbon-based column for LPS/protein adsorption : [abstract]}, year = {2009}, abstract = {The absence of a general method for endotoxin removal from liquid interfaces gives an opportunity to find new methods and materials to overcome this gap. Activated nanostructured carbon is a promising material that showed good adsorption properties due to its vast pore network and high surface area. The aim of this study is to find the adsorption rates for a carboneous material produced at different temperatures, as well as to reveal possible differences between the performance of the material for each of the adsorbates used during the study (hemoglobin, serum albumin and lipopolysaccharide, LPS).}, subject = {Kohlenstofffaser}, language = {en} } @inproceedings{BassamDigelArtmann2009, author = {Bassam, Rasha and Digel, Ilya and Artmann, Gerhard}, title = {Effect of nitric oxide on protein thermal stability : [abstract]}, year = {2009}, abstract = {As a deduction from these results, we can conclude that proteins mainly in vitro, denaturate totally at a temperature between 57°C -62°C, and they also affected by NO and different ions types. In which mainly, NO cause earlier protein denaturation, which means that, NO has a destabilizing effect on proteins, and also different ions will alter the protein denaturation in which, some ions will cause earlier protein denaturation while others not.}, subject = {Stickstoffmonoxid}, language = {en} } @inproceedings{DigelDachwaldArtmannetal.2009, author = {Digel, Ilya and Dachwald, Bernd and Artmann, Gerhard and Linder, Peter and Funke, O.}, title = {A concept of a probe for particle analysis and life detection in icy environments}, year = {2009}, abstract = {A melting probe equipped with autofluorescence-based detection system combined with a light scattering unit, and, optionally, with a microarray chip would be ideally suited to probe icy environments like Europa's ice layer as well as the polar ice layers of Earth and Mars for recent and extinct live.}, subject = {Sonde}, language = {en} } @article{DachwaldOhndorfGill2009, author = {Dachwald, Bernd and Ohndorf, A. and Gill, E.}, title = {Optimization of low-thrust Earth-Moon transfers using evolutionary neurocontrol / Ohndorf, A. ; Dachwald, B. ; Gill, E.}, series = {IEEE Congress on Evolutionary Computation, 2009. CEC '09.}, journal = {IEEE Congress on Evolutionary Computation, 2009. CEC '09.}, isbn = {978-1-4244-2958-5}, pages = {358 -- 364}, year = {2009}, language = {en} } @article{TranKreissigStaat2009, author = {Tran, Thanh Ngoc and Kreißig, R. and Staat, Manfred}, title = {Probabilistic limit and shakedown analysis of thin plates and shells}, series = {Structural safety. 31 (2009), H. 1}, journal = {Structural safety. 31 (2009), H. 1}, publisher = {-}, isbn = {0167-4730}, pages = {1 -- 18}, year = {2009}, language = {en} } @article{TranPhamVuetal.2009, author = {Tran, Thanh Ngoc and Pham, Phu Tinh and Vu, D. K. and Staat, Manfred}, title = {Reliability Analysis of Inelastic Shell Structures Under Variable Loads}, series = {Limit States of Materials and Structures : Direct Methods / Hrsg. Dieter Weichert; Hrsg. Alan Ponter}, journal = {Limit States of Materials and Structures : Direct Methods / Hrsg. Dieter Weichert; Hrsg. Alan Ponter}, publisher = {Springer Netherland}, address = {Berlin}, isbn = {978-1-4020-9633-4}, pages = {135 -- 156}, year = {2009}, language = {en} } @article{ArtmannDigelZerlinetal.2009, author = {Artmann, Gerhard and Digel, Ilya and Zerlin, Kay and Maggakis-Kelemen, Christina and Linder, Peter and Porst, Dariusz and Kayser, Peter and Stadler, David and Dikta, Gerhard and Temiz Artmann, Ayseg{\"u}l}, title = {Hemoglobin senses body temperature}, series = {European Biophysics Journal}, volume = {38}, journal = {European Biophysics Journal}, number = {5}, isbn = {0175-7571}, pages = {589 -- 600}, year = {2009}, language = {en} } @article{SadykovDigelTemizArtmannetal.2009, author = {Sadykov, Rustam and Digel, Ilya and Temiz Artmann, Ayseg{\"u}l and Porst, Dariusz and Linder, Peter and Kayser, Peter and Artmann, Gerhard and Savitskaya, Irina and Zhubanova, Azhar}, title = {Oral lead exposure induces dysbacteriosis in rats}, series = {Journal of Occupational Health. 51 (2009) (2009), H. 1}, journal = {Journal of Occupational Health. 51 (2009) (2009), H. 1}, isbn = {1348-9585}, pages = {64 -- 73}, year = {2009}, language = {en} } @article{DemirciKurulganDemirciTrzewiketal.2009, author = {Demirci, Taylan and Kurulgan Demirci, Eylem and Trzewik, J{\"u}rgen and Linder, Peter and Digel, Ilya and Artmann, Gerhard and Sakizli, Meral and Temiz Artmann, Ayseg{\"u}l}, title = {Gene expression profile analysis of 3T3/NIH fibroblasts after one hour mechanical stress}, series = {IUBMB Life. 61 (2009), H. 3}, journal = {IUBMB Life. 61 (2009), H. 3}, publisher = {Wiley-VCH}, address = {Weinheim}, isbn = {1521-6543}, pages = {311 -- 312}, year = {2009}, language = {en} } @article{DachwaldCarnelliVasile2009, author = {Dachwald, Bernd and Carnelli, Ian and Vasile, Massimiliano}, title = {Evolutionary Neurocontrol: A Novel Method for Low-Thrust Gravity-Assist Trajectory Optimization / Carnelli, Ian ; Dachwald, Bernd ; Vasile, Massimiliano}, series = {Journal of guidance control and dynamics. 32 (2009), H. 2}, journal = {Journal of guidance control and dynamics. 32 (2009), H. 2}, publisher = {AIAA}, address = {Reston, Va.}, isbn = {0731-5090}, pages = {616 -- 625}, year = {2009}, language = {en} } @article{DachwaldBallUlamecetal.2009, author = {Dachwald, Bernd and Ball, Andrew J. and Ulamec, Stephan and Price, Michael E.}, title = {A small mission for in situ exploration of a primitive binary near-Earth asteroid / Ball, Andrew J. ; Ulamec, Stephan ; Dachwald, Bernd ; Price, Michael E. ; [u.a.]}, series = {Advances in Space Research. 43 (2009), H. 2}, journal = {Advances in Space Research. 43 (2009), H. 2}, publisher = {Elsevier}, address = {Amsterdam}, isbn = {0273-1177}, pages = {317 -- 324}, year = {2009}, language = {en} } @article{AminTemizArtmannArtmannetal.2009, author = {Amin, Rashid and Temiz Artmann, Ayseg{\"u}l and Artmann, Gerhard and Lazarovici, Philip and Lelkes, Peter I.}, title = {Permeability of an In Vitro Model of Blood Brain Barrier (BBB)}, series = {13th International Conference on Biomedical Engineering / Lim, Chwee Teck [Ed.]}, journal = {13th International Conference on Biomedical Engineering / Lim, Chwee Teck [Ed.]}, isbn = {978-3-540-92841-6}, pages = {81 -- 84}, year = {2009}, language = {en} } @article{BehbahaniBehrHormesetal.2009, author = {Behbahani, Mehdi and Behr, M. and Hormes, M. and Steinseifer, U. and Arora, D. and Coronado, O. and Pasquali, M.}, title = {A Review of Computational Fluid Dynamics Analysis of Blood Pumps}, series = {European Journal of Applied Mathematics. 20 (2009), H. 4}, journal = {European Journal of Applied Mathematics. 20 (2009), H. 4}, publisher = {Cambridge Univ. Press}, address = {Cambridge}, pages = {363 -- 397}, year = {2009}, language = {en} } @article{BehbahaniFinocchiaroHeinkeetal.2009, author = {Behbahani, Mehdi and Finocchiaro, Thomas and Heinke, Stefanie and Leßmann, Marc}, title = {Methods of design, simulation, and control for the development of new VAD/TAH concepts = Methoden zur Konstruktion, Simulation und Regelung f{\"u}r die Entwicklung von neuen VAD/TAH-Konzepten / Finocchiaro, Thomas ; Heinke, Stefanie ; Behbahani, Mehdi ; Leßma}, series = {Biomedizinische Technik / Biomedical Engineering. 54 (2009), H. 5}, journal = {Biomedizinische Technik / Biomedical Engineering. 54 (2009), H. 5}, isbn = {0013-5585}, pages = {269 -- 281}, year = {2009}, language = {en} } @article{SteinseiferKashefiHormesetal.2009, author = {Steinseifer, Ulrich and Kashefi, Ali and Hormes, Marcus and Schoberer, Mark and Orlikowsky, Thorsten and Behbahani, Mehdi and Behr, Marek and Schmitz-Rode, Thomas}, title = {Miniaturization of ECMO Systems : Engineering Challenges and Methods}, series = {Artificial Organs. 33 (2009), H. 5}, journal = {Artificial Organs. 33 (2009), H. 5}, isbn = {1525-1594}, pages = {A55 -- A55}, year = {2009}, language = {en} } @article{BehbahaniTranWalugaetal.2009, author = {Behbahani, Mehdi and Tran, L. and Waluga, C. and Behr, M. and Oedekoven, B. and Mottaghy, K.}, title = {Model-based Numerical Analysis of Platelet Adhesion, Thrombus Growth and Aggregation for Assist Devices}, series = {The International Journal of Artificial Organs. 32 (2009), H. 7}, journal = {The International Journal of Artificial Organs. 32 (2009), H. 7}, isbn = {0391-3988}, pages = {398 -- 398}, year = {2009}, language = {en} } @article{BehbahaniWalugaStocketal.2009, author = {Behbahani, Mehdi and Waluga, C. and Stock, S. and Mai, A. and Bergmann, B. and Behr, M. and Tran, L. and Vonderstein, K. and Scheidt, H. and Oedekoven, B. and Mottaghy, K.}, title = {Modelling and Numerical Analysis of Platelet Reactions and Surface Thrombus Growth}, year = {2009}, language = {en} } @article{StadlerDigelEmbsetal.2009, author = {Stadler, Andreas M. and Digel, Ilya and Embs, Jan P. and Unruh, Tobias and Tehei, M. and Zaccai, G. and B{\"u}ldt, G. and Artmann, Gerhard}, title = {From powder to solution : Hydration dependence of human hemoglobin dynamics correlated to body temperature}, series = {Biophysical Journal. 96 (2009), H. 12}, journal = {Biophysical Journal. 96 (2009), H. 12}, publisher = {Cell Press}, address = {Cambridge, Mass.}, isbn = {0006-3495}, pages = {5073 -- 5081}, year = {2009}, language = {en} } @article{BaumannSchwarzKotliaretal.2009, author = {Baumann, Marcus and Schwarz, Sonja and Kotliar, Konstantin and Eynatten, Maximilian von and Trucksaess, Arno and Burckhardt, Klaus and Lutz, Jens and Heemann, Uwe and Lanzl, Ines}, title = {Non-diabetic chronic kidney disease influences retinal microvasculature}, series = {Kidney and Blood Pressure Research}, volume = {32}, journal = {Kidney and Blood Pressure Research}, number = {6}, publisher = {-}, isbn = {1423-0143}, pages = {428 -- 433}, year = {2009}, language = {en} } @article{BurkhardtSchwarzPanetal.2009, author = {Burkhardt, Klaus and Schwarz, Sonja and Pan, Chengrui and Stelter, Felix and Kotliar, Konstantin and Eynatten, Maxilian von and Sollinger, Daniel and Lanzl, Ines and Heemann, Uwe and Baumann, Marcus}, title = {Myeloid-related protein 8/14 complex describes microcirculatory alterations in patients with type 2 diabetes and nephropathy}, series = {Cardiovascular Diabetology}, volume = {8}, journal = {Cardiovascular Diabetology}, number = {10}, publisher = {-}, isbn = {1475-2840}, pages = {1 -- 8}, year = {2009}, language = {en} } @article{KotliarKozlovaLanzl2009, author = {Kotliar, Konstantin and Kozlova, Tatiana V. and Lanzl, Ines M.}, title = {Postoperative aqueous outflow in the human eye after glaucoma filtration surgery: biofluidmechanical considerations}, series = {Biomedizinische Technik = Biomedical Engineering}, volume = {54}, journal = {Biomedizinische Technik = Biomedical Engineering}, number = {1}, publisher = {-}, isbn = {1862-278X}, pages = {14 -- 22}, year = {2009}, language = {en} } @article{SeidovaKotliarFoergeretal.2009, author = {Seidova, Seid-Fatima and Kotliar, Konstantin and Foerger, Frauke and Klopfer, Matthias and Lanzl, Ines}, title = {Functional retinal changes in Gaucher disease}, series = {Documenta Ophthalmologica}, volume = {118}, journal = {Documenta Ophthalmologica}, number = {2}, publisher = {Springer}, address = {Berlin}, isbn = {1573-2622}, pages = {151 -- 154}, year = {2009}, language = {en} } @article{KurulganDemirciLinderDemircietal.2009, author = {Kurulgan Demirci, Eylem and Linder, Peter and Demirci, Taylan and Trzewik, J{\"u}rgen and Digel, Ilya and Artmann, Gerhard and Temiz Artmann, Ayseg{\"u}l}, title = {Contractile tension of endothelial cells: An LPS based in-vitro sepsis model}, series = {IUBMB Life. 61 (2009), H. 3}, journal = {IUBMB Life. 61 (2009), H. 3}, publisher = {Wiley}, address = {Weinheim}, isbn = {1521-6543}, pages = {307 -- 308}, year = {2009}, language = {en} } @article{DigelDachwaldArtmannetal.2009, author = {Digel, Ilya and Dachwald, Bernd and Artmann, Gerhard and Linder, Peter and Funke, O.}, title = {A concept of a probe for particle analysis and life detection in icy environments}, pages = {1 -- 24}, year = {2009}, language = {en} } @article{KotliarKharoubiSchmidtTrucksaessetal.2009, author = {Kotliar, Konstantin and Kharoubi, A. and Schmidt-Trucks{\"a}ß, A. and Halle, M. and Lanzl, I.}, title = {Does internal longitudinal microstructure of retinal veins change with age in medically healthy persons?}, series = {Acta Ophthalmologica}, volume = {Vol. 87}, journal = {Acta Ophthalmologica}, number = {Suppl. S244}, publisher = {Wiley}, address = {Weinheim}, issn = {1600-0420 (E-Journal); 1755-3768 (E-Journal); 0001-639X (Print); 1395-3907 (Print); 1755-375X (Print)}, pages = {0}, year = {2009}, language = {en} } @article{ArampatzisKaramanidisMademlietal.2009, author = {Arampatzis, Adamantios and Karamanidis, Kiros and Mademli, Lida and Albracht, Kirsten}, title = {Plasticity of the human tendon to short and long-term mechanical loading}, series = {Exercise and Sport Sciences Reviews}, volume = {37}, journal = {Exercise and Sport Sciences Reviews}, number = {2}, issn = {1538-3008}, doi = {10.1097/JES.0b013e31819c2e1d}, pages = {66 -- 72}, year = {2009}, language = {en} } @inproceedings{GehlerOberBloebaumDachwald2009, author = {Gehler, M. and Ober-Bl{\"o}baum, S. and Dachwald, Bernd}, title = {Application of discrete mechanics and optimal control to spacecraft in non-keplerian motion around small solar system bodies}, series = {Procceedings of the 60th International Astronautical Congress}, booktitle = {Procceedings of the 60th International Astronautical Congress}, publisher = {Elsevier}, address = {Amsterdam}, isbn = {978-161567908-9}, pages = {1360 -- 1371}, year = {2009}, abstract = {Prolonged operations close to small solar system bodies require a sophisticated control logic to minimize propellant mass and maximize operational efficiency. A control logic based on Discrete Mechanics and Optimal Control (DMOC) is proposed and applied to both conventionally propelled and solar sail spacecraft operating at an arbitrarily shaped asteroid in the class of Itokawa. As an example, stand-off inertial hovering is considered, recently identified as a challenging part of the Marco Polo mission. The approach is easily extended to stand-off orbits. We show that DMOC is applicable to spacecraft control at small objects, in particular with regard to the fact that the changes in gravity are exploited by the algorithm to optimally control the spacecraft position. Furthermore, we provide some remarks on promising developments.}, language = {en} } @inproceedings{DachwaldWurm2009, author = {Dachwald, Bernd and Wurm, P.}, title = {Design concept and modeling of an advanced solar photon thruster}, series = {Advances in the Astronautical Sciences}, booktitle = {Advances in the Astronautical Sciences}, publisher = {American Astronautical Society}, address = {San Diego, Calif.}, isbn = {978-087703554-1}, issn = {00653438}, pages = {723 -- 740}, year = {2009}, abstract = {The so-called "compound solar sail", also known as "Solar Photon Thruster" (SPT), holds the potential of providing significant performance advantages over the flat solar sail. Previous SPT design concepts, however, do not consider shadowing effects and multiple reflections of highly concentrated solar radiation that would inevitably destroy the gossamer sail film. In this paper, we propose a novel advanced SPT (ASPT) design concept that does not suffer from these oversimplifications. We present the equations that describe the thrust force acting on such a sail system and compare its performance with respect to the conventional flat solar sail.}, language = {en} } @inproceedings{DachwaldWurm2009, author = {Dachwald, Bernd and Wurm, P.}, title = {Mission analysis for an advanced solar photon thruster}, series = {60th International Astronautical Congress 2009, IAC 2009}, volume = {Vol. 8}, booktitle = {60th International Astronautical Congress 2009, IAC 2009}, publisher = {Elsevier}, address = {Amsterdam}, isbn = {978-161567908-9}, pages = {6838 -- 6851}, year = {2009}, abstract = {The so-called "compound solar sail", also known as "Solar Photon Thruster" (SPT), is a solar sail design concept, for which the two basic functions of the solar sail, namely light collection and thrust direction, are uncoupled. In this paper, we introduce a novel SPT concept, termed the Advanced Solar Photon Thruster (ASPT). This model does not suffer from the simplified assumptions that have been made for the analysis of compound solar sails in previous studies. We present the equations that describe the force, which acts on the ASPT. After a detailed design analysis, the performance of the ASPT with respect to the conventional flat solar sail (FSS) is investigated for three interplanetary mission scenarios: An Earth-Venus rendezvous, where the solar sail has to spiral towards the Sun, an Earth-Mars rendezvous, where the solar sail has to spiral away from the Sun, and an Earth-NEA rendezvous (to near-Earth asteroid 1996FG3), where a large orbital eccentricity change is required. The investigated solar sails have realistic near-term characteristic accelerations between 0.1 and 0.2mm/s2. Our results show that a SPT is not superior to the flat solar sail unless very idealistic assumptions are made.}, language = {en} } @inproceedings{SchartnerLoebDachwaldetal.2009, author = {Schartner, Karl-Heinz and Loeb, H. W. and Dachwald, Bernd and Ohndorf, Andreas}, title = {Perspectives of electric propulsion for outer planetary and deep space missions}, series = {European Planetary Science Congress 2009}, booktitle = {European Planetary Science Congress 2009}, pages = {416 -- 416}, year = {2009}, abstract = {Solar-electric propulsion (SEP) is superior with respect to payload capacity, flight time and flexible launch window to the conventional interplanetary transfer method using chemical propulsion combined with gravity assists. This fact results from the large exhaust velocities of electric low-thrust propulsion and is favourable also for missions to the giant planets, Kuiper-belt objects and even for a heliopause probe (IHP) as shown in three studies by the authors funded by DLR. They dealt with a lander for Europa and a sample return mission from a mainbelt asteroid [1], with the TANDEM mission [2]; the third recent one investigates electric propulsion for the transfer to the edge of the solar system. All studies are based on triple-junction solar arrays, on rf-ion thrusters of the qualified RIT-22 type and they use the intelligent trajectory optimization program InTrance [3].}, language = {en} } @inproceedings{SpurmannOhndorfDachwaldetal.2009, author = {Spurmann, J{\"o}rn and Ohndorf, Andreas and Dachwald, Bernd and Seboldt, Wolfgang and L{\"o}b, Horst and Schartner, Karl-Heinz}, title = {Interplanetary trajectory optimization for a sep mission to Saturn}, series = {60th International Astronautical Congress 2009}, booktitle = {60th International Astronautical Congress 2009}, isbn = {9781615679089}, pages = {5234 -- 5248}, year = {2009}, abstract = {The recently proposed NASA and ESA missions to Saturn and Jupiter pose difficult tasks to mission designers because chemical propulsion scenarios are not capable of transferring heavy spacecraft into the outer solar system without the use of gravity assists. Thus our developed mission scenario based on the joint NASA/ESA Titan Saturn System Mission baselines solar electric propulsion to improve mission flexibility and transfer time. For the calculation of near-globally optimal low-thrust trajectories, we have used a method called Evolutionary Neurocontrol, which is implemented in the low-thrust trajectory optimization software InTrance. The studied solar electric propulsion scenario covers trajectory optimization of the interplanetary transfer including variations of the spacecraft's thrust level, the thrust unit's specific impulse and the solar power generator power level. Additionally developed software extensions enabled trajectory optimization with launcher-provided hyperbolic excess energy, a complex solar power generator model and a variable specific impulse ion engine model. For the investigated mission scenario, Evolutionary Neurocontrol yields good optimization results, which also hold valid for the more elaborate spacecraft models. Compared to Cassini/Huygens, the best found solutions have faster transfer times and a higher mission flexibility in general.}, language = {en} } @inproceedings{StaatTranPham2008, author = {Staat, Manfred and Tran, Thanh Ngoc and Pham, Phu Tinh}, title = {Limit and shakedown reliability analysis by nonlinear programming}, year = {2008}, abstract = {7th International Conference on Reliability of Materials and Structures (RELMAS 2008). June 17 - 20, 2008 ; Saint Petersburg, Russia. pp 354-358. Reprint with corrections in red Introduction Analysis of advanced structures working under extreme heavy loading such as nuclear power plants and piping system should take into account the randomness of loading, geometrical and material parameters. The existing reliability are restricted mostly to the elastic working regime, e.g. allowable local stresses. Development of the limit and shakedown reliability-based analysis and design methods, exploiting potential of the shakedown working regime, is highly needed. In this paper the application of a new algorithm of probabilistic limit and shakedown analysis for shell structures is presented, in which the loading and strength of the material as well as the thickness of the shell are considered as random variables. The reliability analysis problems may be efficiently solved by using a system combining the available FE codes, a deterministic limit and shakedown analysis, and the First and Second Order Reliability Methods (FORM/SORM). Non-linear sensitivity analyses are obtained directly from the solution of the deterministic problem without extra computational costs.}, subject = {Finite-Elemente-Methode}, language = {en} } @inproceedings{TranPhamStaat2008, author = {Tran, Thanh Ngoc and Pham, Phu Tinh and Staat, Manfred}, title = {Reliability analysis of shells based on direct plasticity methods}, year = {2008}, abstract = {Abstracts der CD-Rom Proceedings of the 8th World Congress on Computational Mechanics (WCCM8) and 5th Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2008) 30.06. - 04.07.2008 Venedig, Italien. 2 Seiten Zusammenfassung der Autoren mit graph. Darst. und Literaturverzeichnis}, subject = {Finite-Elemente-Methode}, language = {en} } @inproceedings{MansurovZhubanovaDigeletal.2008, author = {Mansurov, Zulkhair and Zhubanova, Azhar A. and Digel, Ilya and Artmann, Gerhard and Temiz Artmann, Ayseg{\"u}l and Savitskaja, Irina S. and Kozhalakova, A. A. and Kistaubaeva, Aida S.}, title = {The sorption of LPS toxic shock by nanoparticles on base of carbonized vegetable raw materials}, year = {2008}, abstract = {Immobilization of lactobacillus on high temperature carbonizated vegetable raw material (rice husk, grape stones) increases their physiological activity and the quantity of the antibacterial metabolits, that consequently lead to increase of the antagonistic activity of lactobacillus. It is implies that the use of the nanosorbents for the attachment of the probiotical microorganisms are highly perspective for decision the important problems, such as the probiotical preparations delivery to the right address and their attachment to intestines mucosa with the following detoxication of gastro-intestinal tract and the normalization of it's microecology. Besides that, thus, the received carbonizated nanoparticles have peculiar properties - ability to sorption of LPS toxical shock and, hence, to the detoxication of LPS.}, subject = {Kohlenstofffaser}, language = {en} } @article{TemizArtmannKayser2008, author = {Temiz Artmann, Ayseg{\"u}l and Kayser, Peter}, title = {Why is Sepsis an Ongoing Clinical Challenge? Lipopolysaccharide Effects on Red Blood Cell Volume / Temiz, Ayseg{\"u}l ; Kayser, Peter}, series = {Bioengineering in Cell and Tissue Research / Artmann, Gerhard M. ; Chien, Shu (Eds.)}, journal = {Bioengineering in Cell and Tissue Research / Artmann, Gerhard M. ; Chien, Shu (Eds.)}, publisher = {Springer}, address = {Berlin}, isbn = {978-3-540-75408-4}, pages = {497 -- 508}, year = {2008}, language = {en} } @article{ArtmannHueckRossiteretal.2008, author = {Artmann, Gerhard and Hueck, Isgard S. and Rossiter, Katharine and Schmid-Sch{\"o}nbein, Geert W.}, title = {Fluid Shear Attenuates Endothelial Pseudopodia Formation into the Capillary Lumen / Hueck, Isgard S. ; Rossiter, Katharine ; Artman, Gerhard M. ; Schmid-Sch{\"o}nbein, Geert W.}, series = {Microcirculation. 15 (2008), H. 6}, journal = {Microcirculation. 15 (2008), H. 6}, isbn = {1549-8719}, pages = {531 -- 542}, year = {2008}, language = {en} }