TY  - JOUR
A1  - Wagner, Torsten
A1  - Yoshinobu, T.
A1  - Rao, C.
A1  - Otto, R.
A1  - Schöning, Michael Josef
T1  - „All-in-one“ solid-state device based on a lightaddressable potentiometric sensor platform
JF  - Transducers '05 : the 13th International Conference on Solid-State Sensors, Actuators and Microsystems ; Seoul, Korea, [June 5 - 9, 2005] ; digest of technical papers / sponsored by Korean Sensors Society. Technical co-sponsors: IEEE Electron Devices Society
Y1  - 2005
SN  - 0-7803-83995-6
N1  - International Conference on Solid State Sensors, Actuators and Microsystems ; (13, 2005, Seoul)
SP  - 1872
EP  - 1875
PB  - IEEE Operations Center
CY  - Piscataway, NJ
ER  - 
TY  - JOUR
A1  - Waldvogel, Janice
A1  - Freyler, Kathrin
A1  - Helm, Michael
A1  - Monti, Elena
A1  - Stäudle, Benjamin
A1  - Gollhofer, Albert
A1  - Narici, Marco V.
A1  - Ritzmann, Ramona
A1  - Albracht, Kirsten
T1  - Changes in gravity affect neuromuscular control, biomechanics, and muscle-tendon mechanics in energy storage and dissipation tasks
JF  - Journal of Applied Physiology
N2  - This study evaluates neuromechanical control and muscle-tendon interaction during energy storage and dissipation tasks in hypergravity. During parabolic flights, while 17 subjects performed drop jumps (DJs) and drop landings (DLs), electromyography (EMG) of the lower limb muscles was combined with in vivo fascicle dynamics of the gastrocnemius medialis, two-dimensional (2D) kinematics, and kinetics to measure and analyze changes in energy management. Comparisons were made between movement modalities executed in hypergravity (1.8 G) and gravity on ground (1 G). In 1.8 G, ankle dorsiflexion, knee joint flexion, and vertical center of mass (COM) displacement are lower in DJs than in DLs; within each movement modality, joint flexion amplitudes and COM displacement demonstrate higher values in 1.8 G than in 1 G. Concomitantly, negative peak ankle joint power, vertical ground reaction forces, and leg stiffness are similar between both movement modalities (1.8 G). In DJs, EMG activity in 1.8 G is lower during the COM deceleration phase than in 1 G, thus impairing quasi-isometric fascicle behavior. In DLs, EMG activity before and during the COM deceleration phase is higher, and fascicles are stretched less in 1.8 G than in 1 G. Compared with the situation in 1 G, highly task-specific neuromuscular activity is diminished in 1.8 G, resulting in fascicle lengthening in both movement modalities. Specifically, in DJs, a high magnitude of neuromuscular activity is impaired, resulting in altered energy storage. In contrast, in DLs, linear stiffening of the system due to higher neuromuscular activity combined with lower fascicle stretch enhances the buffering function of the tendon, and thus the capacity to safely dissipate energy.
KW  - electromyography
KW  - locomotion
KW  - overload
KW  - stretch-shortening cycle
KW  - ultrasound
Y1  - 2023
U6  - https://doi.org/10.1152/japplphysiol.00279.2022
SN  - 1522-1601 (Onlineausgabe)
SN  - 8750-7587 (Druckausgabe)
VL  - 134
IS  - 1
SP  - 190
EP  - 202
PB  - American Physiological Society
CY  - Bethesda, Md.
ER  - 
TY  - JOUR
A1  - Waldvogel, Janice
A1  - Ritzmann, Ramona
A1  - Freyler, Kathrin
A1  - Helm, Michael
A1  - Monti, Elena
A1  - Albracht, Kirsten
A1  - Stäudle, Benjamin
A1  - Gollhofer, Albert
A1  - Narici, Marco
T1  - The Anticipation of Gravity in Human Ballistic Movement
JF  - Frontiers in Physiology
N2  - Stretch-shortening type actions are characterized by lengthening of the pre-activated muscle-tendon unit (MTU) in the eccentric phase immediately followed by muscle shortening. Under 1 g, pre-activity before and muscle activity after ground contact, scale muscle stiffness, which is crucial for the recoil properties of the MTU in the subsequent push-off. This study aimed to examine the neuro-mechanical coupling of the stretch-shortening cycle in response to gravity levels ranging from 0.1 to 2 g. During parabolic flights, 17 subjects performed drop jumps while electromyography (EMG) of the lower limb muscles was combined with ultrasound images of the gastrocnemius medialis, 2D kinematics and kinetics to depict changes in energy management and performance. Neuro-mechanical coupling in 1 g was characterized by high magnitudes of pre-activity and eccentric muscle activity allowing an isometric muscle behavior during ground contact. EMG during pre-activity and the concentric phase systematically increased from 0.1 to 1 g. Below 1 g the EMG in the eccentric phase was diminished, leading to muscle lengthening and reduced MTU stretches. Kinetic energy at take-off and performance were decreased compared to 1 g. Above 1 g, reduced EMG in the eccentric phase was accompanied by large MTU and muscle stretch, increased joint flexion amplitudes, energy loss and reduced performance. The energy outcome function established by linear mixed model reveals that the central nervous system regulates the extensor muscles phase- and load-specifically. In conclusion, neuro-mechanical coupling appears to be optimized in 1 g. Below 1 g, the energy outcome is compromised by reduced muscle stiffness. Above 1 g, loading progressively induces muscle lengthening, thus facilitating energy dissipation.
Y1  - 2021
U6  - https://doi.org/10.3389/fphys.2021.614060
SN  - 1664-042X
PB  - Frontiers
CY  - Lausanne
ER  - 
TY  - JOUR
A1  - Waller, Mark P.
A1  - Braun, Heiko
A1  - Hojdis, Nils
A1  - Bühl, Michael
T1  - Geometries of Second-Row Transition-Metal Complexes from Density-Functional Theory
JF  - Journal of Chemical Theory and Computation
Y1  - 2007
U6  - https://doi.org/10.1021/ct700178y
SN  - 1549-9626
VL  - 3
IS  - 6
SP  - 2234
EP  - 2242
ER  - 
TY  - JOUR
A1  - Walther, T.
A1  - Gerthsen, D.
A1  - Carius, Reinhard
A1  - Förster, Arnold
T1  - AlAs/GaAs Quantum well structures: Interface properties investigated by high-resolution transmission electron microscopy and photoluminescence spectroscopy / T. Walther ; D. Gerthsen ; R. Carius ; A. Förster ...
JF  - Microscopy of semiconducting materials 1993 : proceedings of the Royal Microscopical Society Conference held at Oxford University, 5 - 8 April 1993 / ed. by A. G. Cullis ... - (Conference series / Institute of Physics ; 134)
Y1  - 1993
SN  - 0-7503-0290-9
N1  - Royal Microscopical Society Conference on Microscopy of Semiconducting Materials <8, 1993, Oxford> ; MSM <8, 1993, Oxford>
SP  - 449
EP  - ff.
PB  - Institute of Physics
CY  - Bristol [u.a.]
ER  - 
TY  - JOUR
A1  - Wang, J.
A1  - Krause, R.
A1  - Block, K.
A1  - Musameh, M.
A1  - Mulchandani, A.
A1  - Schöning, Michael Josef
T1  - Flow injection amperometric detection of OP nerve agents based on organophosphorus-hydrolase biosensor detector
JF  - Biosensors & Bioelectronics. 18 (2003), H. 2-3
Y1  - 2003
SN  - 0956-5663
SP  - 255
EP  - 260
ER  - 
TY  - JOUR
A1  - Wang, Mao
A1  - Anik, Sabri
A1  - Frohberg, Martin G.
T1  - Experiments on the electrochemical determination of the sulphur activities in the system copper-silver at 1200°C
JF  - Zeitschrift für Metallkunde
Y1  - 1988
SN  - 0044-3093
VL  - 79
IS  - 5
SP  - 336
EP  - 339
ER  - 
TY  - JOUR
A1  - Wang, Mao
A1  - Anik, Sabri
A1  - Frohberg, Martin G.
T1  - Thermodynamics of oxygen in the lead-antimony system at 1173 K
JF  - Erzmetall : Rohstoffgewinnung, Verarbeitung, Recycling, Umwelttechnik
Y1  - 1987
SN  - 0044-2658
VL  - 40
IS  - 6
SP  - 316
EP  - 319
ER  - 
TY  - JOUR
A1  - Wang, Ren-Qi
A1  - Druckenmüller, Katharina
A1  - Elbers, Gereon
A1  - Guenther, Klaus
A1  - Croué, Jean-Philippe
T1  - Analysis of aquatic-phase natural organic matter by optimized LDI-MS method
JF  - Journal of mass spectrometry
N2  - The composition and physiochemical properties of aquatic-phase natural organic matter (NOM) are most important problems for both environmental studies and water industry. Laser desorption/ionization (LDI) mass spectrometry facilitated successful examinations of NOM, as humic and fulvic acids in NOM are readily ionized by the nitrogen laser. In this study, hydrophobic NOMs (HPO NOMs) from river, reservoir and waste water were characterized by this technique. The effect of analytical variables like concentration, solvent composition and laser energy was investigated. The exact masses of small molecular NOM moieties in the range of 200–1200 m/z were determined in reflectron mode. In addition, spectra of post-source-decay experiments in this range showed that some compounds from different natural NOMs had the same fragmental ions. In the large mass range of 1200–15 000 Da, macromolecules and their aggregates were found in HPO NOMs from natural waters. Highly humic HPO exhibited mass peaks larger than 8000 Da. On the other hand, the waste water and reservoir water mainly had relatively smaller molecules of about 2000 Da. The LDI-MS measurements indicated that highly humic river waters were able to form large aggregates and membrane foulants, while the HPO NOMs from waste water and reservoir water were unlikely to form large aggregates. Copyright © 2014 John Wiley & Sons, Ltd.
Y1  - 2014
U6  - https://doi.org/10.1002/jms.3321
SN  - 1096-9888
VL  - 49
IS  - 2
SP  - 154
EP  - 160
PB  - Wiley
CY  - Bognor Regis
ER  - 
TY  - JOUR
A1  - Wardoyo, Arinto Y.P.
A1  - Noor, Johan A.E.
A1  - Elbers, Gereon
A1  - Schmitz, Sandra
A1  - Flaig, Sascha T.
A1  - Budianto, Arif
T1  - Characterizing volcanic ash elements from the 2015 eruptions of bromo and raung volcanoes, Indonesia
JF  - Polish Journal of Environmental Studies
N2  - The volcanic eruptions of Mt. Bromo and Mt. Raung in East Java, Indonesia, in 2015 perturbed volcanic materials and affected surface-layer air quality at surrounding locations. During the episodes, the volcanic ash from the eruptions influenced visibility, traffic accidents, flight schedules, and human health. In this research, the volcanic ash particles were collected and characterized by relying on the detail of physical observation. We performed an assessment of the volcanic ash elements to characterize the volcanic ash using two different methods which are aqua regia extracts followed by MP-AES and XRF laboratory test of bulk samples. The analysis results showed that the volcanic ash was mixed of many materials, such as Al, Si, P, K, Ca, Ti, V, Cr, Mn, Fe, Ni, and others. Fe, Si, Ca, and Al were found as the major elements, while the others were the trace elements Ba, Cr, Cu, Mn, P, Mn, Ni, Zn, Sb, Sr, and V with the minor concentrations. XRF analyses showed that Fe dominated the elements of the volcanic ash. The XRF analysis showed that Fe was at 35.40% in Bromo and 43.00% in Raung of the detected elements in bulk material. The results of aqua regia extracts analyzed by MP-AES were 1.80% and 1.70% of Fe element for Bromo and Raung volcanoes, respectively.
Y1  - 2020
U6  - https://doi.org/10.15244/pjoes/99101
SN  - 2083-5906
VL  - 29
IS  - 2
SP  - 1899
EP  - 1907
PB  - HARD
CY  - Olsztyn
ER  - 
TY  - JOUR
A1  - Warerkar, Shashikant
A1  - Schmitz, Stefan
A1  - Göttsche, Joachim
A1  - Hoffschmidt, Bernhard
A1  - Reißel, Martin
A1  - Tamme, Rainer
T1  - Air-Sand Heat Exchanger for High-Temperature Storage
JF  - Journal of Solar Energy Engineering. 133 (2011), H. 2
Y1  - 2011
SN  - 0199-6231
N1  - 7 pages
SP  - 021010
PB  - ASME
CY  - New York
ER  - 
TY  - JOUR
A1  - Warmer, Johannes
A1  - Wagner, Patrick
A1  - Schöning, Michael Josef
A1  - Kaul, Peter
T1  - Detection of triacetone triperoxide using temperature cycled metal-oxide semiconductor gas sensors
JF  - Physica status solidi (a)
Y1  - 2015
U6  - https://doi.org/10.1002/pssa.201431882
SN  - 1862-6319
VL  - 212
IS  - 6
SP  - 1289
EP  - 1298
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Weber, Hans-Joachim
A1  - Bhuju, S.
A1  - Chandra, S.
A1  - Mo, X.
T1  - Fabrication of biodegradable nanofibers for tubular scaffolds in regenerative medicine / Weber, H.-J. ; Bhuju, S. ; Chandra, S. ; Mo, X.
JF  - Biomedizinische Technik. 49 (2004), H. Erg.-Bd. 2, Teil 2
Y1  - 2004
SP  - 1016
EP  - 1017
ER  - 
TY  - JOUR
A1  - Weber, Hans-Joachim
A1  - Hekmat, K.
A1  - Zimmermann, T.
A1  - Kampe, S.
T1  - Impact of tranexamic acid vs. aprotinin on blood loss and transfusion requirements after cardiopulmonary bypass: a prospective, randomised, double-blind trial / Hekmat, K. ; Zimmermann, T. ; Kampe, S. ; Kasper, S. M. ; Weber, H. J. ; Geissler, H. J. ; Meh
JF  - Current Medical Research and Opinion. 20 (2004), H. 1
Y1  - 2004
SN  - 0300-7995
SP  - 121
EP  - 126
ER  - 
TY  - JOUR
A1  - Weber, Hans-Joachim
A1  - Laco, Filip
A1  - Kun, Ma
A1  - Ramakrishna, S.
T1  - The dose effect of human bone marrow-derived mesenchymal stem cells on epidermal development in organotypic co-culture / Laco, Filip ; Kun, Ma ; Weber, Hans Joachim ; Ramakrishna, S. ; Chan, Casey K.
JF  - Journal of Dermatological Science. 55 (2009), H. 3
Y1  - 2009
SN  - 0923-1811
SP  - 150
EP  - 160
ER  - 
TY  - JOUR
A1  - Weber, Hans-Joachim
A1  - Mo, Xiumei
T1  - Electrospinning P(LLA-CL) nanofiber: a tubular scaffold fabrication with circumferential alignment / Xiumei Mo, Hans-Joachim Weber
JF  - Contributions from 6th Austrian Polymer Meeting : Vienna, Austria, September 15 - 17, 2003 / Symposium ed.: W. H. Binder
Y1  - 2004
N1  - Österreichische Polymertage <6, 2003, Wien>. - (Macromolecular symposia ; 217,1)
SP  - 413
EP  - 416
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Weber, Hans-Joachim
A1  - Mo, Xiumei
A1  - Chen, Zonggang
T1  - Electrospun nanofibers of collagen-chitosan and P(LLA-CL) for tissue engineering / Mo Xiumei, Chen Zonggang, Hans J. Weber
JF  - Frontiers of materials science in China. 1 (2007), H. 1
Y1  - 2007
SN  - 1673-7377
SP  - 20
EP  - 23
PB  - -
ER  - 
TY  - JOUR
A1  - Weber, Hans-Joachim
A1  - Mo, Xiumei
A1  - Ramakrishna, S.
T1  - PCL-PGLA composite tubular scaffold preparation and biocompatibility investigation / X. Mo, H.-J. Weber, S. Ramakrishna
JF  - The International journal of artificial organs. 29 (2006), H. 8
Y1  - 2006
SP  - 790
EP  - 799
PB  - -
ER  - 
TY  - JOUR
A1  - Weber, Tobias
A1  - Arent, Jan-Christoph
A1  - Münch, Lukas
A1  - Duhovic, Miro
A1  - Balvers, Johannes M.
T1  - A fast method for the generation of boundary conditions for thermal autoclave simulation
JF  - Composites Part A
N2  - Manufacturing process simulation enables the evaluation and improvement of autoclave mold concepts early in the design phase. To achieve a high part quality at low cycle times, the thermal behavior of the autoclave mold can be investigated by means of simulations. Most challenging for such a simulation is the generation of necessary boundary conditions. Heat-up and temperature distribution in an autoclave mold are governed by flow phenomena, tooling material and shape, position within the autoclave, and the chosen autoclave cycle. This paper identifies and summarizes the most important factors influencing mold heat-up and how they can be introduced into a thermal simulation. Thermal measurements are used to quantify the impact of the various parameters. Finally, the gained knowledge is applied to develop a semi-empirical approach for boundary condition estimation that enables a simple and fast thermal simulation of the autoclave curing process with reasonably high accuracy for tooling optimization.
Y1  - 2016
U6  - https://doi.org/10.1016/j.compositesa.2016.05.036
SN  - 1359-835X
VL  - 88
SP  - 216
EP  - 225
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Weber, Tobias
A1  - Arent, Jan-Christoph
A1  - Steffen, Lucas
A1  - Balvers, Johannes M.
A1  - Duhovic, Miro
T1  - Thermal optimization of composite autoclave molds using the shift factor approach for boundary condition estimation
JF  - Journal of Composite Materials
Y1  - 2017
U6  - https://doi.org/10.1177/0021998317699868
SN  - 1530-793X
VL  - 51
IS  - 12
SP  - 1753
EP  - 1767
PB  - Sage
CY  - London
ER  -