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Search Results: 1 - 10 of 120451 matches for " Wang Zhenyu "
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ρ Graph: Rendezvous ordering graph for Ada concurrent programs
ρ Graph: Rendezvous Ordering Graph forAda Concurrent Programs

Wang Zhenyu,
wang
,Zhenyu

计算机科学技术学报 , 1998,
Abstract:
A Left-Handed, Stem-Twining Plant from the Miocene Shanwang Formation of Eastern China  [PDF]
Qi Wang, Si Shen, Zhenyu Li
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.45A003
Abstract:

Twining stems of plants are very common in extant tropical and subtropical forests, and the climbing growth habit of plants may be an evolutionary innovation and ecological adaptation to either closed, shady or open, edge environments. However, the origin of handedness in climbing plants remains unclear. Here we report a Miocene (ca. 16 million years ago) macrofossil from the Shanwang Formation of Shandong Province, Eastern China, unequivocally exhibiting the first direct fossil evidence for a left-handed, stem-twining growth habit in plants. This fossil plant bears a thicker, slightly curved supporting stem (2 - 3.5 mm wide), which is loosely, spirally twined by a thinner stem (1.5 - 2 mm wide), possibly representing part of distal branches from a liana or vine.

A Comparative Study on Several Anti-Corrosion Materials for Power FGD System  [PDF]
Zhenyu Wang, Dongsheng Mei, Weitao Zhang, Enhou Han, Yushan Wang
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.36078
Abstract: In the study organic-inorganic hybrid composite, epoxy modified silicone coating and vinyl ester flake mastic were comparatively used as several anti-corrosion materials that provided protection for flue gas desulfu-rization (FGD). The relationship between curing conversion rate of hybrid polymer and temperature was investigated by differential scanning calorimeter (DSC). The adhesion strength, coefficient of thermal expansion and flame retardant properties of three anti-corrosion materials were measured and analyzed. A corrosion test in 8% H2SO4 and 5% HCl at temperature cycle of 40°C~ 160°C was applied to study corrosion resistance of several anti-corrosion materials. Gravimetric measurement and morphological observation of three materials before and after corrosion test were comparatively analyzed in the paper. The small weight change and good morphological structure of hybrid composite during corrosion test demonstrate that hybrid composite has better anti-corrosion properties than epoxy modified silicone coating and vinyl ester flake mastic.
High-temperature phases of pyrophyllite and their evolutionary characteristics
Ling Wang,Zhenyu Zhang
Chinese Science Bulletin , 1997, DOI: 10.1007/BF03182788
Abstract: Pyrophyllites from various locations and with different polytype have similar high-temperature phases and evolutionary features. Range from indoor temperature to melting point can commonly be divided into seven stages. Phases and their evolutionary features in both cristobalite and its former stages differ distinctly from phase diagram of SiO2-Al2O3 system, but are in agreement with the diagram in later stages.
Orientating structure of hydroxyls in 2:1 phyllosilicate
Ling Wang,Zhenyu Zhang
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882472
Abstract:
Principles and methods of quantitative analysis onb-axis disorder in 2:1 dioctahedral phyllosilicate
Ling Wang,Zhenyu Zhang
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882789
Abstract:
Fixed points and limit cycles in the population dynamics of lysogenic viruses and their hosts
Zhenyu Wang,Nigel Goldenfeld
Quantitative Biology , 2010, DOI: 10.1103/PhysRevE.82.011918
Abstract: Starting with stochastic rate equations for the fundamental interactions between microbes and their viruses, we derive a mean field theory for the population dynamics of microbe-virus systems, including the effects of lysogeny. In the absence of lysogeny, our model is a generalization of that proposed phenomenologically by Weitz and Dushoff. In the presence of lysogeny, we analyze the possible states of the system, identifying a novel limit cycle, which we interpret physically. To test the robustness of our mean field calculations to demographic fluctuations, we have compared our results with stochastic simulations using the Gillespie algorithm. Finally, we estimate the range of parameters that delineate the various steady states of our model.
Theory of cooperation in a micro-organismal snow-drift game
Zhenyu Wang,Nigel Goldenfeld
Quantitative Biology , 2010, DOI: 10.1103/PhysRevE.84.020902
Abstract: We present a mean field model for the phase diagram of a community of micro-organisms, interacting through their metabolism so that they are, in effect, engaging in a cooperative social game. We show that as a function of the concentration of the nutrients glucose and histidine, the community undergoes a phase transition separating a state in which one strain is dominant to a state which is characterized by coexisting populations. Our results are in good agreement with recent experimental results, correctly predicting quantitative trends and the phase diagram.
The Dosimetric Characteristics and Potential Limitation in Clinical Application of a Low Energy Photon Intra-Operative Radiotherapy System  [PDF]
Zhenhua Xiao, Ouyang Bin, Zhenyu Wang, Botian Huang, Bixiu Wen
International Journal of Medical Physics,Clinical Engineering and Radiation Oncology (IJMPCERO) , 2015, DOI: 10.4236/ijmpcero.2015.42023
Abstract:
Purpose: To investigate the dosimetric characteristics of a low energy photon intra-operative radiotherapy (IORT) system and explore its potential limitation in clinical application. Methods: A special water phantom, a parallel-plate ionization chamber and an electrometer were used to measure the depth dose rate, isotropy of dose distribution in X/Y plane, dosimetry reproducibility of bare probe and spherical applicators of different size which were used in comparison with the system data. Results: The difference in depth dose rate between the measurement and system data for bare probe is -2.16% ± 1.36%, the range of the relative deviation for isotropy in the X/Y plane is between -1.9% and 2.1%. The difference in depth dose rate, transfer coefficient, isotropy in X/Y plane between the measurement and system data for the whole set of spherical applicators is -10.0% - 2.3%, -8.9% - 4.2% and -1.6% - 2.6%, respectively. Higher surface dose rate and steeper gradient depth dose are observed in smaller spherical applicators. The depth dose rate and isotropy for bare probe and spherical applicators have been shown good reproducibility. The uncertainty of measurement is associated with the positioning accuracy, energy response, noise current and correction function f’(R). Conclusions: Thorough commissioning of the low energy photon IORT system helps us better understand the dosimetry characteristics, verify the system data, obtain adequate data for clinical application and routine quality assurance. The steep gradient depth dose and limited treatment range may restrain its potential in clinical application.
Orientating structure of hydroxyls in 2 : 1 phyllosilicate

Wang Ling,Zhang Zhenyu,

科学通报(英文版) , 1997,
Abstract:
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