Stability analysis of BAM neural networks with time-varying delays

Some new criteria for the global asymptotic stability of the equilibrium point for the bi-directional associative memory neural networks with time varying delays are presented. The obtained results present the structure of linear matrix inequality which can be solved efficiently. The comparison with some previously reported results in the literature demonstrates that the results in this paper provide one more set of criteria for determining the stability of the bi-directional associative memory neural networks with delays.     

利用电导法测定离子液体的CMC值

利用电导法分别测定了咪唑类离子液体C12mimBr、C14mimBr、C16mimBr和季铵盐类表面活性剂C16H33N (CH3)3Br-在不同的溶剂水、乙醇、乙酸中的临界胶束浓度(CMC).发现离子液体的CMC值具有一定的规律性:其CMC值随疏水基团中碳氢链的增长而减小,离子液体在不同溶剂中的电导率的变化规律,其顺序为:k(水作溶剂)＞k(乙醇作溶剂)＞k(乙酸作溶剂).在相同温度下,离子液体的电导率随浓度的增大而增大.在相同的测定条件下,离子液体的电导率随着其侧链基团中碳氢链的增长而减小.C12mimBr、C14mimBr、C16mimBr在不同溶剂中的CMC值顺序为:CMC(水作溶剂)＞CMC(乙醇、乙酸作溶剂)     

Efficient Statistical Leakage Power Analysis Method for Function Blocks Considering All Process Variations

With technology scaling into nanometer regime, rampant process variations impact visible influences on leakage power estimation of very large scale integrations (VLSIs). In order to deal with the case of large inter- and intra-die variations, we induce a novel theory prototype of the statistical leakage power analysis (SLPA) for function blocks. Because inter-die variations can be pinned down into a small range but the number of gates in function blocks is large(>1000), we continue to simplify the prototype. At last, we induce the efficient methodology of SLPA. The method can save much running time for SLPA in the low power design since it is of the local-updating advantage. A large number of experimental data show that the method only takes feasible running time (0.32 s) to obtain accurate results (3 σ-error <0.5% on maximum) as function block circuits simultaneous suffer from 7.5%(3 σ/mean) inter-die and 7.5% intra-die length variations, which demonstrates that our method is suitable for statistical leakage power analysis of VLSIs under rampant process variations.     

Hierarchical Neural Networks Method for Fault Diagnosis of Large-Scale Analog Circuits

A novel hierarchical neural networks (HNNs) method for fault diagnosis of large-scale circuits is proposed. The presented techniques using neural networks(NNs) approaches require a large amount of computation for simulating various faulty component possibilities. For large scale circuits, the number of possible faults, and hence the simulations, grow rapidly and become tedious and sometimes even impractical. Some NNs are distributed to the torn sub-blocks according to the proposed torn principles of large scale circuits. And the NNs are trained in batches by different patterns in the light of the presented rules of various patterns when the DC, AC and transient responses of the circuit are available. The method is characterized by decreasing the over-lapped feasible domains of responses of circuits with tolerance and leads to better performance and higher correct classification. The methodology is illustrated by means of diagnosis examples.     

战略联盟下的分布式库存系统建模和仿真

考虑多厂商多仓库的分布式库存系统,根据总成本最小原则,建立基于战略联盟的系统数学优化模型.模型允许不同厂商的多个仓库联合订货,以享受价格折扣,所有仓库之间库存完全共享,可进行调拨.利用遗传算法确定各仓库的订货点和期望补货水平等决策变量,并将其作为仿真模型的输入数据,在eM-plant软件上进行仿真,对调拨量和调拨点进行决策.通过对不同的控制策略仿真的数据统计分析可知,基于战略联盟的联合订货和允许调拨的库存共享策略,可以获得较高的客户服务水平和较低的总费用.     

Discussion of gas enrichment mechanism and natural gas origin in marine sedimentary basin,China

There are abundant natural gas resources in Chinese marine sedimentary basin. The exploration hot shots of natural gas are the Palaeozoic marine strata here in recent years, and several large scale gas fields have been discovered. Chinese Palaeozoic high-post matured and coal measure hydrocarbon source rocks are mainly prone to gas generation in the present. This research considered that gas source rocks and TSR are the key cause of gas enrichment of marine strata. High-quality argillaceous and coal measure hydrocarbon rocks are distributed widely in the Palaeozoic marine strata, which have been in highly matured phase in the present. The argillaceous source rock generally contains various sulfates that could accelerate crude oil cracking to gas for TSR occurrence, and coal measure source rock mainly generates gas, so Chinese marine basin gives priority to accumulating gas. Marine strata have not founded oil reservoirs in the Sichuan Basin and Ordos Basin, and they consist mainly of dry gas. Marine natural gases are the mixed gases of oil cracking gas and coal-formed gas in a general way, oil cracking gases contain usually some H2S and CO2. Hydrocarbon carbon isotopes are very complicated, and methane and ethane isotopic values bear apparent reversal caused by thermal evolution and mixing among different genetic types of natural gas. Coal-formed gases are the main component of Chinese marine natural gas. The Upper Permian of the Sichuan Basin and the Carboniferous-Permian of the Ordos Basin coal measure hydrocarbon source rock present large hydrocarbon generation potential, which are the prospecting highlight of marine natural gas hereafter. Oil cracking gas exploration will be paid much attention to in the Tarim Basin because of the lack of coal measure hydrocarbon source rock.     

体素模型在Monte Carlo模拟计算中的描述

体素模型与Monte Carlo模拟计算方法相结合已开始应用于辐射防护的研究中.然而,通常的模拟计算需要很长的时间,这限制了体素模型的广泛应用.该文对模拟计算中体素模型的描述进行研究,实现了把三维体素合并算法用在MCNP(Monte Carlo N-particle)程序描述体素模型的方法.结果表明,使用该方法描述体素模型,粒子输运过程要比传统的方法快32%,但是对粒子在组织器官中沉积能量的纪录需要更多时间.     

N-(1,1-二甲基-3-氧代丁基)-2-丙烯酰胺的合成

以丙烯酰胺和二丙酮醇为原料,以浓硫酸为催化剂,合成了N-(1,1-二甲基-3-氧代丁基)-2-丙烯酰胺.采用红外光谱、核磁共振、熔点测定等方法对产物进行了表征.得到最佳反应条件为n(丙烯酰胺)∶n(二丙酮醇)∶n(浓硫酸)=2∶4∶1,反应温度为60℃,反应时间为6 h.得到产物的产率为20.0%,熔点为51~53℃.     

Banach空间若干凸性的一种等价刻画

用统一且简洁形式处理Banach空间的一致凸、局一致凸、弱一致凸、弱局一致凸、严格凸及(M)性质和(WM)性质,给出了它们的一种等价刻画.     

猪圆环病毒的分子生物学特性及诊断方法

猪圆环病毒(PCV)病是近年来阻碍养猪业发展的重要传染病,PCV因而成为各国学者的研究热点.本文就猪圆环病毒的基因组结构与功能,主要的编码蛋白质及其功能,分子生物学诊断方法等领域的最新研究进展进行了综述.