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Search Results: 1 - 10 of 64414 matches for " WU Xiu-Fang "
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Investigating of electrons bunching in a Penning trap and accelerating process for CO2 gas mixture active medium
Xiu-fang Tian,Cong-feng Wu,Qika Jia
Physics , 2014,
Abstract: In the presence of an active medium incorporated in a Penning trap, the moving electrons can become bunched, as they get enough energy, they escape the trap forming an optical injector. These bunched electrons can enter next PASER section filled with the same active medium to be accelerated. In this paper, electron dynamics in the presence of gas mixture active medium incorporated in a penning trap is analyzed by developing an idealized 1D model. We further evaluate the energy exchange occurring as the train of electrons traversing the next PASER section. The results show that the oscillating electrons can be bunched at the resonant frequency of the active medium. The influence of the trapped time and the population inversion are analyzed, which shows that the longer the electrons are trapped, the more energy from the medium the accelerated electrons get, and with the increase of the population inversion, the decelerated electrons virtually unchanged but the accelerated electrons more than double their peak energy values. What is more, the simulation results show that the gas active medium need lower population inversion to bunch the electrons compared to the solid active medium. So the experimental condition is easy to be achieved.
Electrical Properties of CuO―doped SrFe0.9Sn0.1O3― δ Thick Film NTC Thermistors
YUAN Chang-Lai,WU Xiu-Fang,LIU Xin-Yu,HUANG Jing-Yue,LI Bo,LIANG Mei-Fang,MO Chong-Gui
无机材料学报 , 2011, DOI: 10.3724/sp.j.1077.2011.00387
Abstract: CuO―doped SrFe0.9Sn0.1O3― δ (CSFS) thick―film negative temperature coefficient (NTC) thermistors ( 20mol%, 30mol%, 40mol%, 50mol% ) were prepared by the screen printing method. The microstructures and electrical prop erties of CSFS thick films were determined. With the increase of CuO content, the surface morphology of thick films becomes denser. The room―temperature resistance values gradually decreases to about 0.46 M Ω and the thermistor― constant values are basically constant at around 3300 K. After the addition of CuO, SrFe0.9Sn0.1O3― δ is decomposed into various SrFe1― xSn xO3― δ ( 0.1< x<1 ) phases. By two― RQ series equivalent circuit model, impedance characteristics of the thick film containing 40mol% CuO content are investigated over the measured temperature range of 25–250 It is found that the total thick―film resistance is mainly attributed to the contribution of grain and grain boundary resistances, both of which show the typical NTC thermistor characteristics. Furthermore, the complete match of peak frequencies between the imaginary parts of impedance and electric modulus suggests that delocalized conduction is the main conduction mechanism in the thick―film NTC thermistors.
Liquid--Liquid Structure Transition in Metallic Melts: Experimental Evidence by Viscosity Measurement
Liquid-Liquid Structure Transition in Metallic Melts: Experimental Evidence by Viscosity Measurement

WANG Yu-Qing,WU Yu-Qin,BIAN Xiu-Fang,

中国物理快报 , 2007,
Abstract: Temperature dependence of viscosity for more than ten kinds of metallic melts is analysed based on viscosity measurements. An obvious turning point is observed on the Arrhenius curves. Since viscosity is one of the physical properties sensitive to structure, its discontinuous change with temperature reveals the possible liquidliquid structure transition in the metallic melts. Furthermore, an integrated liquid structure transition diagram of the Sn-Bi system is presented. The universality of liquid-liquid structure transition is also discussed simply.
Synthesis of P-Zeolite from Alkli-activated Kaolinite and Its Adsoption to K+

CAO Ji-lin,LIU Xiu-wu,JU Yin-xuan,LIU Xiu-fang,TIAN Li-na,

过程工程学报 , 2007,
Abstract: 为降低开发制备P型沸石新工艺的能耗,进行了氢氧化钠碱熔活化高岭土合成P型沸石的研究,分析了活化反应的机理,确定高岭土碱熔活化的适宜条件为:高岭土与氢氧化钠按质量比1:0.94在400℃焙烧碱熔反应2 h,活化物料用水玻璃和水调整摩尔配比为Al2O3:SiO2:NaO:H2O=1:3.2:3.7:220,得到的P型沸石料液体系在80℃下老化反应3 h,然后加少量4A沸石作晶种在95℃晶化30 h,可合成性能良好的P型沸石.以P型沸石作吸附剂对水中K 的吸附实验表明,其对模拟海水的K 吸附量为10.5 mg/g.

YANG Guang,GONG Kai,JIANG Wu-ling,GONG Yan-dao,ZHANG Xiu-fang,ZHAO Nan-ming,

生物物理学报 , 2003,
Abstract: The complex three-dimensional (3D) shapes of most neurons are difficult to observe. With laser scanning confocal microscopy, the shapes of labeled neurons in three dimensions can be reconstructed rapidly, but identification of subtle structures requires electron microscopy. Through serial sections electron microscopy and computer-based SD-reconstruction technique subtle 3D structure of neurons can be obtained. EM 3D-reconstruction technique was introduced, and the key procedures and skills were emphasized. Using this technique, the dendritic spines of pyramidal cell in hippocampus of both young and mature mice were analyzed. The results provide important information for the study of structure, function and plasticity of dendritic spines.
Study on Mutation of ATM/PI3K Region in NPC Cell Lines with Different Radiosensitivity
CNE1、CNE2鼻咽癌细胞株中ATM/PI3K区基因突变的检测 Study on Mutation of ATM/PI3K Region in NPC Cell Lines with Different Radiosensitivity

Hong-Mei Wang,Xin-Yao Wu,Yun-Fei Xia,Yan-Mei Huang,Xiu-Fang Liu,

遗传 , 2003,
Abstract: 为了探讨具有不同放射敏感性的CNE1、CNE2鼻咽癌细胞株中ATM/PI3K区基因突变的情况,采用反转录聚合酶链式反应(RTPCR)技术和PCR产物直接测序方法(荧光标记的ddNTPs循环测序),对CNE1、CNE2中ATM的PI3K关键区域进行突变检测。结果表明,所测CNE1、CNE2中的ATM/PI3K区序列中没有发生突变,认为鼻咽癌细胞株CNE1、CNE2间内在的放射敏感性的差异可能与ATM/PI3K区基因突变不相关。
Effects of Radix et Rhizoma Rhodiolae Kirilowii on expressions of von Willebrand factor, hypoxia-inducible factor 1 and vascular endothelial growth factor in myocardium of rats with acute myocardial infarction
Xiu-fang GAO,Hai-ming SHI
Zhong Xi Yi Jie He Xue Bao , 2009,
Abstract: Objective: To investigate the effects of Radix et Rhizoma Rhodiolae Kirilowii on angiogenesis and expressions of hypoxia-inducible factor 1α (HIF-1α), hypoxia-inducible factor 1β (HIF-1β) and vascular endothelial growth factor (VEGF) in myocardium of rats with acute myocardial infarction (AMI), to elucidate the possible mechanism of Radix et Rhizoma Rhodiolae Kirilowii in promoting angiogenesis, and to investigate that whether or not salidroside could be considered as the effective component of Radix et Rhizoma Rhodiolae Kirilowii with regard to the effects mentioned above.Methods: Thirty-six male Wistar rats had the anterior descending branch of coronary artery ligated as AMI model. Rats were fed with normal saline (untreated group), Radix et Rhizoma Rhodiolae Kirilowii solution (Radix et Rhizoma Rhodiolae Kirilowii group) or salidroside solution (salidroside group) from 7 days before until 7 days after the operation, with twelve rats in each group. All rats were sacrificed 7 days after the operation. Immunohistochemical assay (IHC) was used for detecting the expression of von Willebrand factor (vWF); TaqMan real-time quantitative polymerase chain reaction (PCR) assay was employed for detection of the levels of HIF-1α, HIF-1β and VEGF mRNAs; Western blot analysis was used for detection of the corresponding protein levels. Results: Results of IHC index showed that both at infarct border zone and non-infarct zone, the expressions of vWF were significantly increased in Radix et Rhizoma Rhodiolae Kirilowii group as compared with the untreated group (P<0.05). The expressions of HIF-1α, HIF-1β and VEGF mRNAs and the expressions of HIF-1α and VEGF proteins were significantly increased in the Radix et Rhizoma Rhodiolae Kirilowii group as compared with the untreated group (P<0.01). The level of HIF-1β protein in the Radix et Rhizoma Rhodiolae Kirilowii group was also higher than that in the untreated group but the difference was not statistically significant (P>0.05). All the expression levels, including those of vWF, HIF-1α, HIF-1β and VEGF, in the salidroside group were higher than those in the untreated group while lower than those in the Radix et Rhizoma Rhodiolae Kirilowii group.Conclusion: Radix et Rhizoma Rhodiolae Kirilowii may promote angiogenesis in myocardium of rats with AMI through elevating the expressions of HIF-1α, HIF-1β, and VEGF. Salidroside may be one of the effective components in Radix et Rhizoma Rhodiolae Kirilowii, which increases the expressions of HIF-1α, HIF-1β and VEGF during ischemia or hypoxia.
Existence of Positive Solution of a Class of Semi-linear Sub-elliptic Equation in the Entire Space $H^n$
Zhu-Jun Zheng,Xiu-Fang Feng
Mathematics , 2002,
Abstract: In this paper, we study the following problem $$ \{{ll} \Delta_{H^n} u-u+u^p=0 & in H^n u>0& in H^n u(x)\to 0 &\rho(x)\to\infty}. $$ where $1

质体醌库和细胞色素b6f参与调控蓝细菌 Synechocystis sp. PCC 6803的状态转换

MAO Hai-bin,LI Guo-fu,RUAN Xiang,WU Qing-yu,GONG Yan-dao,ZHANG Xiu-fang,ZHA O Nan-ming,

生物物理学报 , 2002,
Abstract: The effects of 1,4-benzoquinone (BQ) and 2,5-dibromo-3-methy l- 6-isopropyl-p-benzoquinone (DBMIB) on the state transitions of Synechocyst is sp. PCC 6803 were investigated by using modulated chlorophyll fluores cence. Both BQ and DBMIB are benzoquinone analogues and can accept el ectrons from plastoquinone. DBMIB also can bind to the Qo site of th e cytochrome b 6 f complex with high affin-ity. In the absence of actinic light, B Q induced a transition from state 2 to state 1 in dark-adapted cells. To the contrary, DBMIB induced transition to state 2 in the presence of BQ or DCMU (3-(3',4'-dichlorophenyl)-1,1-dimethylurea). These results imply that the redox state of plastoquinone pool con-trols the state transitions and cytochrome b 6 f is involved in these processes.

LI Xun-hu,WANG Hong-wu,GONG Hai-peng,GONG Yan-dao,ZHAO Nan-ming,ZHANG Xiu-fang,

生物物理学报 , 2001,
Abstract: In this paper four types of chitosan with different molecular weight and deacetylation degree were used, and their effects on the growth of fetal mouse cerebral cortex (FMCC) cells were studied. Adsorption amounts of albumin and fibronectin on chitosan membranes were measured by means of Enzyme Linked Immunosorbent Assay (ELISA), and the circular dichroism (CD) spectra of albumin adsorbed on chitosan membranes were also measured. Results indicated that in these four types of chitosan, the higher degree of deacetylation, the more protein adsorbed on membranes. The secondary structure of albumin adsorbed on the first type of chitosan was significantly different from that on the other three types of chitosan.Axons growed faster on the two types of chitosan with higher molecular weight.
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