Search Results - (Author, Cooperation:W. Ren)
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1Latest Papers from Table of Contents or Articles in PressM. Qu ; D. D. Lefebvre ; Y. Wang ; Y. Qu ; D. Zhu ; W. Ren
American Association for the Advancement of Science (AAAS)
Published 2014Staff ViewPublication Date: 2014-10-11Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: China ; Cyanobacteria/*growth & development ; *Harmful Algal Bloom ; Lakes/*microbiologyPublished by: -
2Latest Papers from Table of Contents or Articles in PressZ. Ma ; D. S. Melville ; J. Liu ; Y. Chen ; H. Yang ; W. Ren ; Z. Zhang ; T. Piersma ; B. Li
American Association for the Advancement of Science (AAAS)
Published 2014Staff ViewPublication Date: 2014-11-22Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Animal Migration ; Animals ; *Biodiversity ; Birds ; China ; *Conservation of Natural Resources ; *WetlandsPublished by: -
3Latest Papers from Table of Contents or Articles in PressS. Xu ; Z. Yan ; K. I. Jang ; W. Huang ; H. Fu ; J. Kim ; Z. Wei ; M. Flavin ; J. McCracken ; R. Wang ; A. Badea ; Y. Liu ; D. Xiao ; G. Zhou ; J. Lee ; H. U. Chung ; H. Cheng ; W. Ren ; A. Banks ; X. Li ; U. Paik ; R. G. Nuzzo ; Y. Huang ; Y. Zhang ; J. A. Rogers
American Association for the Advancement of Science (AAAS)
Published 2015Staff ViewPublication Date: 2015-01-13Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
4Latest Papers from Table of Contents or Articles in PressX. Zhang ; W. Ren ; P. DeCaen ; C. Yan ; X. Tao ; L. Tang ; J. Wang ; K. Hasegawa ; T. Kumasaka ; J. He ; D. E. Clapham ; N. Yan
Nature Publishing Group (NPG)
Published 2012Staff ViewPublication Date: 2012-06-09Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Alphaproteobacteria/*chemistry ; Amino Acid Sequence ; Bacterial Proteins/*chemistry/metabolism ; Crystallization ; Crystallography, X-Ray ; HEK293 Cells ; Humans ; *Ion Channel Gating ; Models, Molecular ; Molecular Sequence Data ; Protein Conformation ; Sodium Channels/*chemistry/metabolism ; Structure-Activity RelationshipPublished by: -
5Latest Papers from Table of Contents or Articles in PressStaff View
Publication Date: 2013-05-24Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsPublished by: -
6Latest Papers from Table of Contents or Articles in PressD. Deng ; P. Sun ; C. Yan ; M. Ke ; X. Jiang ; L. Xiong ; W. Ren ; K. Hirata ; M. Yamamoto ; S. Fan ; N. Yan
Nature Publishing Group (NPG)
Published 2015Staff ViewPublication Date: 2015-07-16Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsPublished by: -
7Latest Papers from Table of Contents or Articles in PressRen, W., Ye, X., Su, H., Li, W., Liu, D., Pirmoradian, M., Wang, X., Zhang, B., Zhang, Q., Chen, L., Nie, M., Liu, Y., Meng, B., Huang, H., Jiang, W., Zeng, Y., Li, W., Wu, K., Hou, Y., Wiman, K. G., Li, Z., Zhang, H., Peng, R., Zhu, S., Pan-Hammarström, Q.
American Society of Hematology (ASH)
Published 2018Staff ViewPublication Date: 2018-06-15Publisher: American Society of Hematology (ASH)Print ISSN: 0006-4971Electronic ISSN: 1528-0020Topics: BiologyMedicineKeywords: Lymphoid NeoplasiaPublished by: -
8Latest Papers from Table of Contents or Articles in PressRen, W., Liu, N., Sang, C., Shi, D., Zhou, M., Chen, C., Qin, Q., Chen, W.
The American Society for Microbiology (ASM)
Published 2018Staff ViewPublication Date: 2018-05-18Publisher: The American Society for Microbiology (ASM)Print ISSN: 0099-2240Electronic ISSN: 1098-5336Topics: BiologyPublished by: -
9Latest Papers from Table of Contents or Articles in PressRen, W., Liu, Y., Wang, X., Piao, C., Ma, Y., Qiu, S., Jia, L., Chen, B., Wang, Y., Jiang, W., Zheng, S., Liu, C., Dai, N., Lan, F., Zhang, H., Song, W.-c., Du, J.
The American Association of Immunologists (AAI)
Published 2018Staff ViewPublication Date: 2018-02-21Publisher: The American Association of Immunologists (AAI)Print ISSN: 0022-1767Electronic ISSN: 1550-6606Topics: MedicinePublished by: -
10Latest Papers from Table of Contents or Articles in PressLi, X., Bamba, M., Yuan, N., Zhang, Q., Zhao, Y., Xiang, M., Xu, K., Jin, Z., Ren, W., Ma, G., Cao, S., Turchinovich, D., Kono, J.
American Association for the Advancement of Science (AAAS)
Published 2018Staff ViewPublication Date: 2018-08-24Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyGeosciencesComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: PhysicsPublished by: -
11Latest Papers from Table of Contents or Articles in PressC. L. Zhang, H. D. Cheng, S. Y. Ren, W. P. Zhang, Zhuo Chen, Y. Wang, J. H. Ma, C. S. Zhang and Z. Y. Guo
Institute of Physics (IOP)
Published 2018Staff ViewPublication Date: 2018-12-20Publisher: Institute of Physics (IOP)Print ISSN: 1755-1307Electronic ISSN: 1755-1315Topics: GeographyGeosciencesPhysicsPublished by: -
12Latest Papers from Table of Contents or Articles in PressStaff View
Publication Date: 2018-11-06Publisher: Institute of Physics (IOP)Print ISSN: 1755-1307Electronic ISSN: 1755-1315Topics: GeographyGeosciencesPhysicsPublished by: -
13Articles: DFG German National LicensesXu, F. ; Trolier-McKinstry, S. ; Ren, W. ; Xu, Baomin
[S.l.] : American Institute of Physics (AIP)
Published 2001Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: In this article, domain wall motion and the extrinsic contributions to the dielectric and piezoelectric responses in sol–gel derived lead zirconate titanate (PZT) films with compositions near the morphotropic phase boundary were investigated. It was found that although the films had different thicknesses, grain sizes, and preferred orientations, similar intrinsic dielectric constants were obtained for all films between 0.5 and 3.4 μm thick. It was estimated that about 25%–50% of the dielectric response at room temperature was from extrinsic sources. The extrinsic contribution to the dielectric constant of PZT films was mainly attributed to 180° domain wall motion, which increased with both film thickness and grain size. In studies on the direct and converse longitudinal piezoelectric coefficients of PZT films as a function of either stress or electric driving field, it was found that the ferroelastic non-180° domain wall motion was limited. Thus extrinsic contributions to the piezoelectric response were small in fine grain PZT films (especially those under 1.5 μm in thickness). However, as the films became thicker (〉5μm), nonlinear behavior between the converse piezoelectric coefficient and the electric driving field was observed. This indicated that there was significant ferroelectric non-180° domain wall motion under high external excitation in thicker films. The activity of the non-180° domain walls was studied through non-180° domain switching. For fine grain films with film thicknesses less than 2 μm, non-180° switching was negligible. Transmission electron microscopy plan-view micrographs evidenced non-180° domain fringes in these films, where the vast majority of grains were 50–100 nm in diameter and showed a single set of domain fringes. Taken together, these measurements suggest that the pinning of non-180° domain walls is very strong in films with thickness less than 2 μm. In thicker films, non-180° domain switching was evidenced when the poling field exceeded a threshold field. The threshold field decreased with an increase in film thickness, suggesting more non-180° domain wall mobility in thicker films. Non-180° domain switching in large grained PZT films was found to be much easier and more significant than in the fine grained PZT films. © 2001 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
14Articles: DFG German National LicensesRen, W. ; Bauer, S. ; Yilmaz, S¸. ; Wirges, W. ; Gerhard-Multhaupt, R.
[S.l.] : American Institute of Physics (AIP)
Published 1994Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Nonlinear optical polymers contain molecular dipoles with very large hyperpolarizabilities in a glassy polymer matrix. Two typical examples—a guest-host system with dispersed polar dye molecules and a side-chain material with chemically attached molecular dipoles—were investigated by means of poling experiments, dielectric spectroscopy, thermally stimulated depolarization, and electro-optical thermal analysis. The dielectric behavior of both polymers can be described by the phenomenological Havriliak–Negami equation, and the existence of master curves for both materials demonstrates the validity of the time-temperature superposition principle above the respective glass transitions. Temperature-dependent mean relaxation times and relaxation-time distributions calculated from the dielectric data allow for an optimization of poling times. The dielectric relaxation strengths obtained from poling current and field, from dielectric measurements, and from thermally stimulated depolarization are in very good agreement and thus represent a useful measure of the polarization in poled polymers. From the temperature dependence of the polarization, optimal poling temperatures may be derived. Electro-optical thermal analysis yields the same temperature-stability curves as thermally stimulated depolarization and is therefore a valuable tool for investigating the stability of poled polymers, especially since it is not sensitive to charge effects. Optimal poling fields and currents must be selected as a compromise between high dipole mobilities (short relaxation times) and low bulk conductivities.Type of Medium: Electronic ResourceURL: -
15Articles: DFG German National LicensesBauer, S. ; Ren, W. ; Yilmaz, S¸. ; Wirges, W. ; Molzow, W.-D. ; Gerhard-Multhaupt, R. ; Oertel, U. ; Hänel, B. ; Häussler, L. ; Komber, H. ; Lunkwitz, K.
Woodbury, NY : American Institute of Physics (AIP)
Published 1993Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: Stable polymers with nonlinear optical side groups were synthesized from maleic anhydride copolymers and the azo dye Disperse Red 1 via esterification. After electrode poling under 135 V/μm at 185 °C, thermal stabilities were measured by pyroelectric and electro-optic thermal analysis and compared to a guest/host polymer of polymethylmethacrylate and the same dye. The pyroelectrically detected dipole orientation and the electro-optic activity of the side-chain polymers decreased only above 150 °C, and electro-optic r33 coefficients of up to 6 pm/V were achieved at 780 nm even without optimizing the dye content.Type of Medium: Electronic ResourceURL: -
16Articles: DFG German National LicensesYang, G.-M. ; Bauer-Gogonea, S. ; Sessler, G. M. ; Bauer, S. ; Ren, W. ; Wirges, W. ; Gerhard-Multhaupt, R.
Woodbury, NY : American Institute of Physics (AIP)
Published 1994Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: Electron beams with an energy of 10 keV were employed for selectively poling only the lower part of a typical nonlinear optical guest/host polymer at a temperature of 90 °C. The resulting dipole orientation was examined by means of electro-optical measurements and thermally stimulated depolarization, while the nonuniform charge and polarization profiles were probed with laser-induced pressure pulses and thermal waves. The concept of nonlinear optical frequency conversion with simultaneous mode conversion is described as an example for the advantages of such a selective poling process.Type of Medium: Electronic ResourceURL: -
17Articles: DFG German National LicensesRen, W. ; Liu, S-F. ; Mukherjee, B. K.
Woodbury, NY : American Institute of Physics (AIP)
Published 2002Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: Electric-field-induced phase transitions and piezoelectric properties of 〈001〉-oriented Pb(Zn1/3Nb2/3)O3–xPbTiO3 single crystals for x=4.5% and 8% (PZN–4.5%PT and PZN–8%PT) have been investigated as a function of temperature. It was found that the piezoelectric properties and phase transitions for both crystals are strongly dependent on temperature. The measurements of polarization and strain as a function of unipolar electric field show that the field for the rhombohedral–tetragonal phase transition decreases linearly with temperature in the range between 25 and 105 °C. Thus, raising the temperature can stabilize the tetragonal phase in 〈001〉-oriented PZN–PT crystals. Longitudinal piezoelectric constant d33 in the rhombohedral phase increases with temperature for both crystals; in PZN–4.5%PT the slope itself increases significantly at temperatures over 60 °C. In the field-induced tetragonal phase, there is little change in d33 for PZN–8%PT within the temperature range investigated, while in PZN–4.5%PT a slight increase of d33 with temperature was observed at temperatures above 80 °C. © 2002 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
18Articles: DFG German National LicensesStaff View
ISSN: 0022-0248Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: Chemistry and PharmacologyGeosciencesPhysicsType of Medium: Electronic ResourceURL: -
19Articles: DFG German National LicensesStaff View
ISSN: 0006-291XSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyPhysicsType of Medium: Electronic ResourceURL: -
20Articles: DFG German National LicensesNew formalism for the SCF-Xα-SW model with application to large molecular systems or atomic clustersStaff View
ISSN: 0009-2614Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: Chemistry and PharmacologyPhysicsType of Medium: Electronic ResourceURL: