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Search Results: 1 - 10 of 55683 matches for " Xu Bei-Xue "
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THEORETICAL DEPENDENCE OF LONG WAVELENGTH PHOTOEMISSION UPON THE SIZE OF Ag NANOPARTICLES EMBEDDED IN BaO SEMICONDUCTOR THIN FILM

Yang Hai,Cai Wu-de,Xu Bei-xue,Wu Jin-lei,

中国物理 B , 2001,
Abstract: The dependence of long wavelength photoemission upon the size of Ag nanoparticles embedded in a BaO semiconductor is predicted and discussed theoretically. The calculated results show that the increase in the diameter of the Ag nanoparticle, in the range from 1.5 to 37.0nm, leads to the emergence of a roughly Gaussian form of the photoemission spectra and the peaks become markedly narrower. The results also show that the increase in the diameter of the Ag nanoparticle leads to the decrease of the long wavelength threshold. The incident light wavelength corresponding to the peak value of the photoemission gets bigger with the increase of the size of Ag nanoparticles, thus showing a redshift.
Intermetallic combination of lanthanum and silver nanoparticles prepared by vacuum deposition
镧与真空沉积银纳米粒子的金属间化合

Xu Bei-Xue,Wu Jin-Lei,Hou Shi-Min,Zhang Xi-Yao,Liu Wei-Min,Xue Zheng-Quan,Wu Quan-De,
许北雪
,吴锦雷,侯士敏,张西尧,刘惟敏,薛增泉,吴全德

物理学报 , 2002,
Abstract: The tendency of intermetallic combination between silver and lanthanum is analyzed based on the Hume Rothery rule, and the possibility of forming intermetallic compounds between silver and lanthanum in vacuum deposition is analyzed according to the condition of vacuum deposition. The X ray photoelection spectroscopy method is used to analyze the thin films of silver and lanthanum formed by vacuum deposition. The results confirm the existence of intermetallic compounds between silver and lanthanum.
ENHANCED PHOTOEMISSION FROM METAL NANOPARTICLE COMPOSITE THIN FILMS (Ag-BaO) DOPED WITH RARE-EARTH ELEMENTS
稀土对金属纳米粒子-介质复合薄膜(Ag-BaO)光电发射性能的增强

XU BEI-XUE,WU JUN-LEI,LIU WEI-MIN,YANY HAI,SHAO QING-YI,LIU SHENG,XUE ZENG-QUAN,WU QUAN-DE,
许北雪
,吴锦雷,刘惟敏,杨海,邵庆益,刘盛,薛增泉,吴全德

物理学报 , 2001,
Abstract: A metal nanoparticles-composite thin film (Ag-BaO), doped by rare-earth elements, was grown by vacuum deposition. Compared with the normal Ag-BaO thin film, the photoemission current of the doped Ag-BaO thin film increases by about 40%. The transmission electron micrograph indicated that Ag nanoparticles become smaller when doped with rare-earth. With the smaller size of Ag nanoparticles, photoelectrons are easier to transgress from Ag nanoparticles via tunnel effect. Thus the photomission current increases.
Miniaturization of lanthanum on silver nanoparticles in thin films
稀土镧对薄膜中银纳米粒子的细化作用

Xu Bei-Xue,Wu Jin-Lei,Shao Qing-Yi,Zhang Zhao-Xiang,Liu Wei-Min,Xue Zeng-Quan,Wu Quan-De,
许北雪
,吴锦雷,邵庆益,张兆祥,刘惟敏,薛增泉,吴全德

物理学报 , 2002,
Abstract: 通过更换基底材料,证实了稀土镧对AgBaO薄膜中银纳米粒子的细化作用.用LewisCampbell的薄膜理论分析表明,稀土镧对银纳米粒子的细化作用机理是,基底吸附稀土镧增强了基底对银原子的等效吸附能和基底表面徙动激活能,使镧和银结合形成的复合小银粒子在基底表面的徙动扩散运动受到削弱,进而减少了相互团聚所致.基底表面徙动激活能增量在0.04—0.07eV之间,相应的基底对银原子的等效吸附能增量在0.08—0.42eV之间
Dietary sea cucumber cerebroside alleviates orotic acid-induced excess hepatic adipopexis in rats
Bei Zhang, Changhu Xue, Xiaoqian Hu, Jie Xu, Zhaojie Li, Jingfeng Wang, Teruyoshi Yanagita, Yong Xue, Yuming Wang
Lipids in Health and Disease , 2012, DOI: 10.1186/1476-511x-11-48
Abstract: Male Wistar rats were randomly divided into four groups including normal control group, NAFLD model group, and two SCC-treated groups with SCC at 0.006% and 0.03% respectively. The fatty liver model was established by administration of 1% orotic acid (OA) to the rats. After 10d, serum and hepatic lipid levels were detected. And the serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) activities were also determined. Besides, to gain the potential mechanism, the changes of key enzymes and gene expressions related to the hepatic lipid metabolism were measured.Dietary SCC at the level of 0.006% and 0.03% ameliorated the hepatic lipid accumulation in fatty liver rats. SCC administration elevated the serum triglyceride (TG) level and the ALT, AST activities in OA-fed rats. The activities of hepatic lipogenic enzymes including fatty acid synthase (FAS), malic enzyme (ME) and glucose-6-phosphatedehydrogenase (G6PDH) were inhibited by SCC treatment. And the gene expressions of FAS, ME, G6PDH and sterol-regulatory element binding protein (SREBP-1c) were also reduced in rats fed SCC. However, dietary SCC didn't affect the activity and mRNA expression of carnitine palmitoyltransferase (CPT) in liver. Besides, suppression of microsomal triglyceride transfer protein (MTP) activity was observed in SCC-feeding rats.These results suggested that dietary SCC could attenuate hepatic steatosis due to its inhibition of hepatic lipogenic gene expression and enzyme activity and the enhancement of TG secretion from liver.
An investigation of cellular distribution of manganese in hyperaccumlator plant Phytolacca acinosa Roxb. using SRXRF analysis
XU Xiang-hu,SHI Ji-yan,CHEN Ying-xu,XUE Sheng-guo,WU Bei,HUANG Yu-ying,
XU Xiang-hu
,SHI Ji-yan,CHEN Ying-xu,XUE Sheng-guo,WU Bei,HUANG Yu-ying

环境科学学报(英文版) , 2006,
Abstract: Phytolacca acinosa Roxb. (P. acinosa) is a recently discovered mangane se hyperaccumulator plant from southern China. It is a good candidate for phytor emediation of manganese(Mn) polluted soil for its high biomass and fast growth. Knowledge of the tissue localization and identification of heavy metals can prov ide essential information on metal toxicity and bioaccumulation mechanisms. Sync hrotron radiation X-ray fluorescence spectroscopy (SRXRF) microprobe was used in this study to investigate the cellular distributions of Mn and other elements i n root, stem, leaf, petiole and midrib of P. acinosa. The highest Mn content was found in the vascular tissues of root, stem, petiole and midrib. Cortex in root played a key role in Mn absorption and Mn was limited in the vascular bundle du ring the process of transportation in stem. Moreover, Mn content in leaf epiderm is was higher than that in mesophyll, which suggested that the sequestration of Mn in leaf epidermis might be one of the detoxification mechanisms of P. acinosa . The significance of other elemental (such as P, S, K, Ca, Fe, Zn and Cu) distr ibution patterns and the correlation with Mn were also discussed.
Grey relational analysis of soil moisture under different landuses in the Loess Hilly Region
黄土丘陵区不同土地利用的土壤水分灰色关联度

ZHANG Bei-Ying,XU Xue-Xuan,LIU Wen-Zhao,DU Feng,
张北赢
,徐学选,刘文兆,杜峰

生态学报 , 2008,
Abstract: Based on the data collected by random survey of soil moisture in the Loess Hilly Region,the authors analyzed the dynamic characteristics of soil moisture under different landuses.The result showed that landuses made soil moisture in vertical layer quite different.In terrace land,the variational trend of soil moisture in different layers was accordant,that is,the fluctuation of soil moisture in vertical layer was little.Under different landuses,the variation of soil moisture between surface layer(0-30cm) and middle layer(30-100cm) was accordant,and landuse,in terms of the accordant degree,ranks in the descendant order of terrace land,pasture land,forestland,and shrub land.Except pasture land,the grey relational grade of the landuses between surface layer(0-30cm) and deep layer(100-200cm) was least,which means that soil moisture varied remarkably.The grey relational grade of soil moisture in each month was different.In shrub land,except December,the variational trend of soil moisture was similar.By contraries,grass land had the different trend,and the fluctuation of soil moisture in growth season was great.It can be seen that the different landuses resulted in the difference of dynamic characteristics of soil moisture.
Dynamic changes of soil moisture in loess hilly and gully region under effects of different yearly precipitation patterns.
黄土丘陵沟壑区不同降水年型下土壤水分动态

ZHANG Bei-ying,XU Xue-xuan,LIU Wen-zhao,CHEN Tian-lin,
张北赢
,徐学选,刘文兆,陈天林

应用生态学报 , 2008,
Abstract: Based on field determinations, the dynamic changes of soil moisture in dry farmland, Robinia pseudoacacia forestland, Hippophae shrubland and Bothriochloa ischaemum grassland in loess hilly and gully region under effects of different yearly precipitation patterns were analyzed. The results showed that yearly precipitation pattern had definite effects on the seasonal variation and profile distribution of soil moisture. In normal year, soil moisture in dry farmland had a gentle seasonal variation; in dry year, it decreased slowly before rainy season but increased markedly after rainy season; while in rainy year, it had an overall increase and the increment was remarkable after rainy season. The soil moisture in R. psendoacacia forestland, Hippophae shrubland, and B. ischaemun grassland decreased as a whole in normal year. In dry year, soil moisture in Hippophae shrubland decreased first and increased then, while that in R. psendoacacia forestland and B. ischaemun grassland varied in "W" type, with the minimum in June and August. In rainy year, the seasonal variation of soil moisture in R. psendoacacia forestland and Hippophae shrubland presented "V" type, and that in B. ischaemu grassland fluctuated markedly, with the minimum in August. In dry farmland, the active and sub-active layers of soil moisture were deeper in dry year than in normal year, and the sub-active layer disappeared in rainy year. In R. psendoacacia forestland and B. ischaemu grassland, the active layer of soil moisture was deeper in dry and rainy years than in normal year; while in Hippophae shrubland, this active layer was shallower in dry and rainy years than in normal year.
Study on the Decriminalization of the Abetment or Assistance in Suicidal Behavior
—Based on the Objective Imputation Theory
 [PDF]

Zongsheng Xu, Xue Jiang
Beijing Law Review (BLR) , 2016, DOI: 10.4236/blr.2016.74026
Abstract: Preferably Objectives: Study on whether abetting or assisting suicidal behavior constitutes a crime. Methods: With the Objective Imputation Theory to solve the causality relationship between the death results and abetment or assistance of suicidal behavior. Results: This paper discusses the abetment and assistance of suicidal behavior in the system of objective imputation theory. After a comprehensive analysis and demonstration, we get the results that the abetment and assistance behavior does not meet the three constituent conditions of objective imputation theory. Conclusions: The abetment and assistance of suicidal behavior does not constitute the crime of intentional homicide.
On the Origin of Early Jade Dagger-Axe: A Brief Analysis  [PDF]
Cheng Xue, Yingzhi Xu
Archaeological Discovery (AD) , 2017, DOI: 10.4236/ad.2017.53011
Abstract: The jade dagger-axe is a significant ritual artifact in prehistoric China and therefore has been the subject of much discussion among archaeologists and historians. The authors compare the jade dagger-axe and the axe in terms of the morphological features, the means of hafting, and the use in burial ritual. It appears that the shape of the jade dagger-axe is the result of improving the axe. The means of hafting the jade dagger-axe is generally identical to that of the axe. The ritualization of the jade dagger-axe follows that of the axe. Therefore, the jade dagger-axe may have originated from the axe.
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