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Search Results: 1 - 10 of 178326 matches for " ZHANG Xiao-Y "
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Research on multimedia co-processor unit based on AltiVec technology
支持 AltiVec技术的多媒体协处理单元的研究 *

HUANG Xiao-ping,FAN Xiao-y,ZHANG Sheng-bing,

计算机应用研究 , 2008,
Abstract: To speed up the processing on the multimedia information, a multimedia co-processor unit can be imported into the embedded processor. The paper presented a method to implement AltiVec technology on the Longtium processor, it mainly fo-cused on the research of the AltiVec technology, dynamic instruction scheduling and pipeline. It was demonstrated the archi-tecture could upgrade the performance of the Longtium processor.
Polarization fatigue in poly(vinylidene fluoride (78%)-trifluoroethylene (22%)) ferroelectric thin films: a pulse train study

Luo Xiao-Y,Zhang Ji-Hao,Yan Xue-Jian,Zhu Guo-Dong,

中国物理 B , 2010,
Abstract: This paper investigates the influences of polarization fatigue on remanent polarization and switching time by pulse train measurements in ferroelectric poly(vinylidene fluoride (78%) and trifluoroethylene (22%)) thin films. Fatigue was carried out by a series of bipolar switching pulses with constant pulse width (on-time) and various interval times between pulses (off-time). The experimental observations indicated that the off-time period showed no obvious influence on fatigue rate and the switching time increased with the increase of fatigue cycles. The origination of these phenomena was discussed according to the charge injection model.
Stream-oriented fine-grain asynchronous memory access schedule

ZHANG Yu-xuan,WEI Ting-cun,FAN Xiao-y,ZHANG Meng,

计算机应用研究 , 2012,
Abstract: This paper focused on the asynchronous schedule mechanism, and presented a fine-grain solution to improve further efficiency. This solution involved semaphore and spinlock, to enable the cooperation of heterogeneous cores and the promotion of local speedup. This solution was experimented on the stream prototype system with a set of testbench, to evaluate the performance of the schedule solution, and analyzed related factors.
Establishment of molecular ID in 11 Ganoderma lucidum strains

ZHANG Xiao-Y,XU Xiu-Hong,LIU Hua-Jing,

微生物学通报 , 2013,
Abstract: Objective] Eleven Ganoderma lucidum strains were collected as materials for classifying them at the molecular level and establishing the molecular ID. Methods] Internal transcribed spacer (ITS) and simple sequence repeat (SSR) markers were used for the molecular identification of eleven Ganoderma lucidum strains. Results] 99% similarity in ITS sequence between the tested strains and the Ganoderma lucidum registered in GenBank, meaning that the tested strains were Ganoderma lucidum species. The cluster analysis by NTSYS revealed that eleven Ganoderma lucidum strains were divided into four groups at similarity coefficients of 0.62. GL-2 and GL-4 were in two clades respectively. According to fragment size of allele variation, the agarose gel electrophoresis bands were analyzed by the software ID Analysis 1.0. Five primer pairs could be used to identify all the tested strains and accomplish the establishment of molecular ID. Conclusion] Establishment of molecular ID in Ganoderma lucidum based on SSR were feasibly.
Differences in water use efficiency and aquaporin gene expression in waxy maize varieties under different stress conditions

ZHENG Xiao-Y,ZHANG Zheng-Bin,XU Ping,YANG Yin-Fu,

中国生态农业学报 , 2011,
Abstract: Aquaporin (AQP) is critical in coupling water and nutrients, which is an important mechanism of crop water (WUE) and nutrient (NUE) use efficiency. Differences in leaf water use efficiency (LWUE) and in aquaporin gene expression in waxy maize varieties were tested under various stress conditions. The stress conditions used in the study included low nitrogen (0.5N, half dose nitrogen of 0.5 Hoagland solution), high nitrogen (1.5N, 1.5 times nitrogen of 0.5 Hoagland solution), drought (10% PEG with -0.1 MPa water potential ) and salt (200 mmol·L-1 NaCl). Expressions of three AQP genes in the roots of waxy maize were tested by the RT-PCR method. The results showed that LWUE in three waxy maize varieties was less under 0.5N treatment than that under CK. It was, however, higher than that of CK under 1.5N and PEG treatments. TIP2a, TIP2b and TIP3.1 genes expressions were partially or completely suppressed under 0.5N stress treatment. The gene expressions were, however, amplified under 1.5N (for 6 h) and PEG (for 9 h) treatments. This suggested that TIP gene family was enhanced by nitrogen, drought and salt stress. Furthermore, the expression of TIP and LWUE were weaker under 0.5N treatment than under CK, but stronger on different degrees under PEG and 1.5N treatments than under CK. Close relations were noted between TIP gene expression and change in WUEL. These findings indicated that WUE was largely controlled by the levels of TIP expression, which was different among waxy maize varieties.
Using new DPSO algorithm to solve assignment problem

SUN Xiao-y,LIN Yan,

计算机应用研究 , 2009,
Abstract: Assignment problem is a NP-Complete problem in the field of combinatorial optimization. This paper proposed a discrete particle swarm algorithm to solve the problem. In the algorithm the location of each particle represented a feasible plan. The cross strategy and local search technology were adopted when updating the particle positions. These techniques could ensure the solution feasible in the iterative process, increase the diversity of particles and avoid premature during optimization. The simulation examples show that the DPSO algorithm is simple, and it can give better solution than other algorithms with fast convergence. The algorithm is able to solve the problem which the Hungary algorithm cannot do. For different issues it can achieve good convergence effects through adjusting the impact parameters.
Application of ISSR marker in the genetics analysis of monokaryons from Auricularia auricula

SONG Xiao-Y,XIAO Yang,BIAN Yin-Bing,

菌物学报 , 2007,
Abstract: Two parent monokaryons (T1, T2) and thirty-three of F1 sporulated monokaryons have been developed from cultivated strain XinKe 5 of Auricularia auricula by protoplast monokaryonization and single-spore isolation technique. Seventy-three ISSR primers were screened and thirteen which could differentiate T1 and T2 effectively were selected to amplify strain XinKe 5 and F1 sporulated monokaryons. A total of seventy fragments were amplified, among them sixty-three (accounting for 90.0% of the total) were polymorphic. Genetic similarity coefficient matrix (GS) among thirty-six strains ranged from 0.2500 for the lowest similarity coefficient between parent monokaryotic strains T1 and T2 to 0.8382 for the greatest extent of similarity. The ISSR dendrogram based on the similarity coefficient matrix was constructed by using NTsys 2.10e software. Tested strains could be classified into 2 major groups: T1 and twenty-four of F1 sporulated monokaryons fell into same group, while T2 and the rest of F1 sporulated monokaryons fell into the other group. Monokaryons were notclassified strictly based on mating types. The results showed that chromosome crossing-over in each basidia of fruitbody was complex and polymorphic during meiosis, and the most of F1 sporulated monokaryons resembled parental monokaryon T1. The potential applications of ISSR marker were discussed in cross breeding of Auricularia auricula.

Li Quan,Liu Xiao-y,Wang Rong,Zhu Zheng-he,Fu Yi-bei,Wang Xiao-lin,

中国物理 B , 2001,
Theoretical study on molecular reaction dynamics of the SiH2 system

Feng Xing,Zhu Zheng-He,Liu Xiao-Y,Yang Xiang-Dong,Huang Wei,

物理学报 , 2009,
Abstract: 基于多体展式方法所导出的SiH2(X1A1)分析势能函数,用准经典的Monte Carlo轨线法研究了Si(1Dg)+H2(0,0)和H(2Sg)+SiH(0,0)的原子与分子反应动力学过程.研究结果表明:Si(1Dg)与H2(0,0)的碰撞在低能时(小于209.20 kJ/mol)生成稳定的络合物SiH2(X1A1),该反应是无阈能反应;而H(2Sg)与SiH (0,0)碰撞不能生成稳定的络合物,主要发生交换反应H(2Sg)+SiH (0,0)→Si(1Dg)+H2(0,0),该反应也是无阈能反应.
An Optimal Approach in Design of Input/Output Subsystem of RISC Microprocessor

RAN Ji-quan,FAN Xiao-y,SUN Hua-jin,

计算机应用研究 , 2005,
Abstract: 低效率的访存操作是限制微处理器性能提高的一个关键因素。提出了I/O子系统(IOSS)设计中一种优化的模型,阐述了该模型提高访存效率的机制,分析了这种模型协调微处理器与存储器之间速度差异的作用。Verilog仿真、综合和静态时序分析的结果表明该设计达到了预定的要求。目前龙腾Ⅱ微处理器已经进入后端流程,不久将使用0.18μm的工艺进行流片。
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