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Search Results: 1 - 10 of 130546 matches for " ZHANG Xue-ping "
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Research on concurrency control mechanism for collaborative of virtual prototype
虚拟样机协同设计并发控制策略研究 *

ZHANG Xue-ping,YIN Guo-fu,

计算机应用研究 , 2008,
Abstract: To contrapose such problems as large volume of data, long-term transaction process and nested layer in collabora-tive of virtual prototype, this paper established a new strategy of collaborative design. Then discussed the relationships among structure, transaction submission, the inter-lock mechanism and conflict harmonization. According data requirements to repli-cate contents, other stations can read data and show the graph when data are changed. It is verified that the concurrency con-trol strategy not only enabled the collaborative users handle shared resources freely, but also ensured the agility concurrency control and the consistency of real-time data by an application example.
Effects of nerve growth factor on the action potential duration and repolariz-ing currents in a rabbit model of myocardial infarction
Yun-Feng Lan,Jian-Cheng Zhang,Jin-Lao Gao,Xue-Ping Wang
老年心脏病学杂志(英文版) , 2013,
Abstract: Objectives To investigate the effect of nerve growth factor (NGF) on the action potential and potassium currents of non-infarcted myocardium in the myocardial infarcted rabbit model. Methods Rabbits with occlusion of the left anterior descending coronary artery were prepared and allowed to recover for eight weeks (healed myocardial infarction, HMI). During ligation surgery of the left coronary artery, a polyethylene tube was placed near the left stellate ganglion in the subcutis of the neck for the purpose of administering NGF 400 U/d for eight weeks (HMI + NGF group). Cardiomyocytes were isolated from regions of the non-infarcted left ventricular wall and the action potentials and ion currents in these cells were recorded using whole-cell patch clamps. Results Compared with HMI and control cardiomyocytes, significant prolongation of APD50 or APD90 (Action potential duration (APD) measured at 50% and 90% of repolarization) in HMI + NGF cardiomyocytes was found. The results showed that the 4-aminopyridine sensitive transient outward potas sium current (Ito), the rapidly activated omponent of delayed rectifier potassium current (IKr), the slowly activated component of delayed rectifier potassium current (IKs), and the L-type calcium current (ICaL) were significantly altered in NGF + HMI cardiomyocytes compared with HMI and control cells. Conclusions Our results suggest that NGF treatment significantly prolongs APD in HMI cardiomyocytes and that a decrease in outward potassium currents and an increase of inward Ca2+ current are likely the underlying mechanism of action.
Convergence properties of the kernel-type density estimator under WOD dependent samples

HU Xue-ping
, ZHANG Hong-mei

- , 2017, DOI: 10.6040/j.issn.1671-9352.0.2016.329
Abstract: 摘要: 设{Xn,n≥1}为同分布的WOD随机序列, f(x)为共同的概率密度函数。利用WOD序列的Rosenthal-型矩不等式和Bernstein-型指数不等式, 对密度函数f(x)的核估计进行了探讨, 在适当条件下得到了核估计的r 阶相合性、逐点强相合性和依概率一致收敛性。
Abstract: Let {Xn,n≥1} be an identically distributed WOD random sequence with a commen density functiong f(x). Based on the Rosenthal-type inequality and Bernstein-type inequality for WOD sequence, the kernel estimator for density function f(x)was investigated under suitable conditions, and the consistency in r order mean, the pointwise strong consistency and uniform consistency in L1 were obtained

LU Jian,ZHANG Xue-Ping,MENG Xiao-Qi,

微生物学通报 , 2000,
Abstract: To understand the antagomism of Clostridium butyricm and Bifidobacterium infants to v. cholera. Either Clostridium butyricum LCL166 or Bifidobacterium infants LCL172 or both of them co-cultured with V. cholera of, 0139, counting the number of V. cholera in constant intervals and performing statistics analysis. The inhibition results are probably same when combination of LCL166 and LCL172 were compared with LCL166 alone. The antagonism to V. cholera results mainly from Clostridium butyricum LCL166 which has the inhibition effect to V.cholera.
Ultrastructure of the Spermatozoon of the Northern Grass Lizard (Takydromus septentrionalis) with Comments on the Variability of Sperm Morphology Among Lizard Taxa

ZHANG Yong-pu,YING Xue-ping,JI Xiang,

动物学研究 , 2005,
Abstract: We studied the ultrastructure of the spermatozoon of northern grass lizards ( Takydromus septentrionalis , n = 5) collected in April 2003 from a population in Wenzhou, Zhejiang, eastern China. The mature spermatozoa are characterized by: A circular acrosome; an acrosomal vesicle divided into cortex and medulla; the unilateral ridge of the acrosome vesicle divided into cortex and medulla, the electron-lucent zone between them; a prenuclear perforatorium, absence of the perforatorium base plate; presence of the subacrosomal space; an elongated nucleus, absence of a endonuclear canal; absence of epinuclear lucent zone; rounded nuclear shoulders. A bilateral stratified laminar structure within the neck region. A short midpiece; absence of multilaminar membranes; in longitudinal section, two tiers of mitochondria, in transverse section, six mitochondria with linear cristae; the presence of two dense body groups, the ring structure consisting of the complete ring; the arrangement pattern of the ring structure and mitochondria in rsl/mil and rs2/mi2; a fibrous sheath in the midpiece; presence of an annulus. A thin granular zone of cytoplasm at the anterior portion of the principal piece; the enlarged fiber 3 and fiber 8 disappearing at the anterior portion of the principal piece; the axoneme complex having an usual 9 + 2 pattern. Within lacertid lizards, sperms differ among species in the number of mitochondria, but in all species studied so far, there are two groups of dense bodies. However, lizards of different taxa differ, in various degrees, in such sperm morphological traits as acrosome vesicle, subacrosomal space, epinuclear lucent zone, perforatorium base plate, nuclear shoulder and number and arrangement of mitochondria and dense bodies. These differences suggest that sperm morphology provides additional information which one may use to study the phylogeny of lizards.
Research on Testing Strategies and Methods for Java Multithread

ZHANG Xue-ping,BAO Dan,WANG Jia-yao,

计算机应用研究 , 2006,
Abstract: Based on analyzing the features of Java multithread,testing strategies and methods are discussed in this paper.Java multithread testing is consist of class testing,integration block testing and system testing.The main testing methods for Java multithread are proposed,such as inherit testing,synchronization testing and synchronization efficiency testing.
Morphological variation in three geographical populations of Estellarca olivacea

ZHANG Yong-pu,YING Xue-ping,WANG Tie-gan,CHAI Xue-liang,

海洋科学 , 2009,
Abstract: Based on nine morphological characters of populations of Estellarca olivacea from Zhejiang Lingkun, Zhejiang Sanmen and Jiangsu Tongzhou, the morphological variations of three geographical populations were studied by means of multivariate morphometrics. The results of cluster analysis and principal component analysis revealed that the morphological characters of E. olivacea from Zhejiang Sanmen population and Zhejiang Lingkun population were similar to each other but were much more different from the character of Jiangsu Tongzhou population. In the principal component analysis, two principal components were constructed. The contributory ratios of the two principal components were 47.73% and 13.56% respectively and the cumulative contributory ratio was 61.29%. The shell protrusion or flat, shell thick and fore-and-aft shape determined the morphological variations of different geographical populations of E. olivacea, which were related with the water temperature and substrate.
On the Up-and-Down Threshold Measurement Method of Fatigue Crack Propagation in Sheet Metal

ZHANG Jian-yu,LI Cui-ping,HAO Xue-ping,

实验力学 , 2008,
Abstract: 测定疲劳裂纹扩展门槛值传统方法的整个过程只测出裂纹扩展门槛值的一个观测值,而由于材料不均匀等客观因素的限制,传统试验法的结果具有一定的随机性.本文利用升降法的原理,提出一种测定疲劳裂纹扩展门槛值的升降法:预制裂纹并逐级降载使裂纹扩展速率接近门槛值速率,设定应力强度因子的级差,按照设定级差逐级降载,直至裂纹扩展速率低于门槛值速率,然后开始升载,直至裂纹扩展速率高于门槛值速率,再开始降载,如此重复进行即可以在疲劳裂纹扩展门槛值附近测得多对相反的数据点.运用小子样升降法数据处理方法,就可得到疲劳裂纹扩展门槛值的均值和方差.最后通过某型铝合金薄板疲劳裂纹扩展门槛值的测定试验验证了此方法的可行性.
Eco-geographical analysis of soil animals in burned forest areas in Greater Hinggan Mountains

ZHANG Xue-ping,ZHANG SHU-hua,LI Jing-ke,

地理研究 , 2006,
Abstract: Based on researches on soil animals in burned forest areas and contrast sample lands around Tahe County in Heilongjiang Province during different years,we analyze the category and quantity of soil animals in order to take them as a biological indicator to reflect the environmental conditions and the restoration after fire.In October,2003,we chose six burned forest areas in different years from 1987 within the study area and a sample land which wasn't destroyed by fire.Separating soil animals by the methods of picking up,Tullgren and Baerman,we obtained 4 phyla,7 classes and 22 orders in all.In addition,soil animals in burned forest areas differ obviously during different years. (1)The category and quantity of macro-soil faunas prove to be very few,especially Enchytraeidae,which takes up a lower proportion in macro-soil faunas the first one to three years after fire,however,some macro-soil faunas which have strong moving abilities,such as centipedes,spiders etc.,account for higher proportions.Furthermore,the number of Enchytraeidae gradually increases and tends to be stable after burning three to five years. (2)Of all the meso-and micro-soil animals,Protura only appears in burned forest areas after burning 16 years and the contrast sample lands,thus,we can conclude that Protura is a fauna which can indicate stable habitat. (3)After burning,the first species which are able to invade and restore are those macro-soil animals possessing strong moving abilities,and then the meso-and micro-soil animals,which are in the prosperous period six to seven years after fire,when the category and quantity begin to decrease and tend to be stable. (4)The intensity of fire influences the restoration of soil animals community to a certain extent,that is,soil animals restore at a higher speed in the areas which suffered from mild burning,after six to seven years,toth the category and the quantity can even surpass those in regions not affected by fire. (5)However,the speed of restoration is relatively low in the moderately and seriously affected areas,which may take longer than 16 years to restore to a normal level.
Effect of potassium compounds on the catalytic activity of V_2O_5/AC for SCR of NO by NH_3 at low temperatures:NH_3 adsorption and oxidation
燃煤烟气中碱金属化合物对V2O5/AC催化剂低温脱硝的影响: NH3的吸附与氧化

ZHANG Xian-long,WU Xue-ping,HUANG Zhang-gen,LIU Zhen-yu,

燃料化学学报 , 2009,
Abstract: K2O and K2SO4 are loaded on the catalyst V2O5(1%)/AC(V1/AC) by the method of wet immersing followed by drying.The effect of potassium compounds on the catalytic performance of V1/AC for the low temperature SCR of NO by NH3 was investigated.It was found that both K2O and K2SO4 as ultra-fine particles loaded in V1/AC can cause the catalyst deactivation.The adsorption of NH3 on the catalyst,especially the portion of weakly adsorbed NH3,is inhibited remarkably by the loading of potassium compounds.The inhibitio...
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