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Search Results: 1 - 10 of 78380 matches for " Weizhong Chen "
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Auto-amplifying dynamic behavior of heap and convection in granular material
Weizhong Chen,Rongjue Wei
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02883565
Abstract: Two experiments have been carried out to understand the physical characteristics of surface heap and internal convection of granular material subjected to vertical vibration. The results show that they have a clear auteamplifying behavior. An effective force leading to the heap and cunvection has been obtained, which includes the square and cubic terms of the local height.

XU Zuyao,CHEN Weizhong,

材料研究学报 , 1988,
Abstract: Effect of austenite strengthening on M_s and B_s temeratures in threeFe-Ni-C alloys and three commercial steels are studied.M_s temperature lo-wers linearly with the increase of the austenite strength,while B_s seems indepen-dent of the austenit estrength
Auto-amplifying dynamic behavior of heap and convection in granular material

Weizhong Chen,Rongjue Wei,

科学通报(英文版) , 1998,
Abstract: Two experiments have been carried out to understand the physical characteristics of surface heap and internal convection of granular material subjected to vertical vibration. The results show that they have a clear auteamplifying behavior. An effective force leading to the heap and cunvection has been obtained, which includes the square and cubic terms of the local height.
Modeling of ultrasound contrast agents bubble dynamics with modified surface tension coefficient
LuJie Zheng,Juan Tu,WeiZhong Chen
Chinese Science Bulletin , 2009, DOI: 10.1007/s11434-009-0431-9
Abstract: The current work proposes a model describing the dynamics of coated microbubbles, which simplifies the traditional three-layer model to a two-layer one by introducing a visco-elastic interface with variable surface tension coefficients to connect the gas zone and the liquid zone. In the modified model, the traditional two interfaces boundary conditions are combined into one to simplify the description of the bubble. Moreover, the surface tension coefficient is defined as a function of bubble radius with lower and upper limits, which are related to the buckling and rupture mechanisms of the bubble. Further discussion is made regarding the effects resulting from the change of the surface tension coefficient on bubble dynamics. The dynamic responses of Optison and Sonozoid microbubbles, measured experimentally based on light scattering technology (adapted from previously published work), are simulated using both classic three-layer models (e.g. Church’s model) and simplified model. The results show that our simplified model works as well as the Church’s model.
Protective behavior of an SO2/CO2 gas mixture for molten AZ91D alloy
Liang Weizhong,Gao Qiu,Chen Fu
China Foundry , 2012,
Abstract: The protective behavior for a molten AZ91D alloy in an open melting furnace was investigated under a protective gas mixture containing 3% SO2 and 97% CO2, and the protection mechanism was discussed. Experimental results show that the gas mixture provides effective protection for AZ91D melt in the temperature range from 680 ìC to 730 ìC. The microstructure, chemical composition and phase composition of the surface film formed on the molten AZ91D alloy were analyzed using scanning electron microscopy (SEM) with energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The SEM results demonstrate that the surface films with an average thickness between 0.5 レm and 2 レm are dense and coherent in the protected temperature range. The EDS results reveal that the surface film mainly contains elements S, C, O, Al and Mg. The XRD results show that the surface film consists of MgO, MgS and a small amount of C phase.
Cholangiocarcinoma Arising 38 Years after Surgical Resection of Hepatocellular Carcinoma  [PDF]
Jianguo Chen, Weizhong Lu, Lianxin Wang, Yixin Zhang, Nengjin Wang, Yongsheng Chen, Jian Zhu, Hongwei Zheng, Jun Yang, Fei Chen
Journal of Cancer Therapy (JCT) , 2013, DOI: 10.4236/jct.2013.45107

Background: Most of the reports on tumor relapse are recurrence of the same type of tumor after months to few years of a successful initial cancer treatment. It is generally unusual and unexpected that a different type of the second tumor occurs after several decades of the curative treatment of the original tumor. Case Presentation: We report a case of 74-year-old man with intrahepatic cholangiocarcinoma (ICC) diagnosed 38 years after curative resection of hepatocellular carcinoma (HCC). In addition to the uniqueness of longer survival and developed a new type of tumor, both the original HCC and the later occurred ICC were detected through a cancer surveillance program by screening alpha-fetoprotein (AFP) and ultrasonography of the liver for the general population and/or high risk group of people who were asymptomatic. Conclusion: This report provides evidence demonstrating occurrence of new type of tumor following initial curative therapy of the original tumor. In addition, this case report also highlights the importance of cancer surveillance program for earlier detection of the tumors to achieve a remarkably improved prognosis of the cancer patients for a prolonged cancer free survival time.

An experiment on multibubble sonoluminescence spectra in sodium chloride solution
Zhan Chen,JunFeng Xu,Wei Huang,WeiZhong Chen,GuoQing Miao
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0216-6
Abstract: We investigated experimentally the spectra of MBSL in sodium chloride water solution with krypton as dissolved gas. We observed and compared the spectra of hydroxyl ion at 310 nm and that of sodium atom at 589 nm. It has been found that under the same experimental condition, the intensity of sodium atom spectra is obviously higher than that of the hydroxyl ion spectra, and is more sensitive to the experimental condition. The krypton content, the concentration of sodium chloride solution, and the driving sound pressure obviously affect the spectra intensity in certain range.
PEG-Protein Interaction Induced Contraction of NalD Chains
Jiyan Yu, Weizhong Chen, Chi Wu, Hao Chen
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0096616
Abstract: In a recent attempt to crystallize a regulator of MexAB-OprM multi-drug efflux systems in Pseudomonas aeruginosa (NalD), we found that adding polyethylene glycol (PEG3350, Mw = 3,350 g/mol) into the protein solution increases the speed of NalD migration in gel electrophoresis, signaling a smaller hydrodynamic size. At first we conjectured that NalD was degraded unexpectedly by PEG; however, we found that there was no change in its molar mass by MALDI-TOF characterization. Moreover, we found that adding polyacrylic acid (PAA) into the solution mixture returned the NalD migration to its normal speed. Furthermore, our analytic ultracentrifugation and dynamic laser light scattering results directly reveal that NalD interacts with PEG so that individual NalD chains gradually shrink as more PEG chains are added in the range of 10–50 mg/mL. Size exclusion chromatography also confirms that the NalD chain shrinks in the presence of PEG. A combination of these results indicates that PEG3350 chains can complex with NalD to induce an intra-protein chain contraction, presumably via the formation of hydrogen bond between –C-O-C– on PEG and –COOH on NalD, resulting in a smaller hydrodynamic size (faster migration) and a higher apparent molar mass. Note that because the presence of PEG affects osmotic pressure, it is considered to be a precipitator of protein crystallization. Our current finding reveals that the interaction of PEG/protein may play a significant role in protein crystallization. The complexation potentially makes the protein chain segments less flexible, and consequently makes crystallization easier. Hopefully, our current results will stimulate further studies in this direction.
SNPs and TFBS Associated with High Altitude Sickness*  [PDF]
Norman E. Buroker, Xuehan Ning, Zhaonian Zhou, Kui Li, Weijun Cen, Xiufeng Wu, Weizhong Zhu, C. Ronald Scott, Shihan Chen
Open Journal of Blood Diseases (OJBD) , 2013, DOI: 10.4236/ojbd.2013.33018
Abstract: The rSNPs for the genes AKT3 (rs4590656), EGLN1 (rs480902), eNOS3 (rs1007311), and VEGFA (rs699947, rs13207311, rs1570360, rs2010963) have been significantly associated with the physiological parameters in high altitude sickness Han or Tibetan Chinese patients at the Qinghai-Tibetan plateau. The alleles of each rSNP have been found to create unique transcriptional factor binding sites for transcription factors that affect the process of hypoxia gene expression in this high altitude hypoxia environment.
Measuring the Pattern of High Temperature Areas in Urban Greenery of Nanjing City, China
Weizhong Su,Guishan Yang,Shuang Chen,Yinbao Yang
International Journal of Environmental Research and Public Health , 2012, DOI: 10.3390/ijerph9082922
Abstract: Most studies are concerned with the cooling effect of urban greenery, but some have also revealed that some patches changed from normal temperature areas (NTAs) into high temperature areas (HTAs). Landsat TM images and ArcGIS software are used to analyze the HTA patterns in Nanjing, China. The HTAs’ lower limit temperature was defined as the 30.26 °C and the percentage of the HTAs in all greenery was 24.87%. The disturbance on the cooling effect existed but not evidently. The average impervious ratio (IR) and surface temperature (ST) of HTAs, respectively, were 3.76 times and higher 2.86 °C than those of NTAs. The structure of NTAs’ IR levels was extremely uneven but the HTAs’ were relatively even. However, the co-coefficient between the IR and ST in the whole greenery was small. Sampling analysis with the same ST and IR revealed that the complex environment in green buffer affected temperature differences; The adjacent HTAs, with its 89.78% in the study area, largely along the green patch, were far more than independent HTAs and presented a ring shape. Thus, the significantly heterogeneous urban environment inevitably resulted in diverse factors forming HTAs.
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