动态电路的混合时序分析方法

本文基于四事件周期波形模型,提出了一般动态门、LO-CMOS、NTP动态门和N-C2MOS锁存器正确工作的时序约束.将混合时序分析方法应用于动态电路的延时计算,提出了动态门延时测试波形的生成算法,能有效处理多个输入同时翻转对延时的影响.本文的研究成果已在SpiceTime中实现,并且应用于一个32位动态加法器的设计,取得了良好效果,如果不考虑伪路径的影响,求值延时和预充延时的最大误差分别为3.62%和8.26%.

基于混合时频分析方法的风电机组故障诊断

针对风电机组传动链系统振动信号非高斯、非平稳性的特点,提出了一种基于混合时频分析的风电机组故障诊断方法。该方法首先采用参数优化Morlet小波消噪方法对原始振动信号进行分析,滤除强大的背景噪声干扰;进而通过自项窗方法抑制时频面的干扰项,增强信号特征成分,提取故障特征以实现故障诊断。在Morlet小波参数优化过程中,采用交叉验证法优化波形参数及连续小波变换的尺度参数;在自项窗的设计过程中,采用基于平滑伪魏格纳分布的函数进行设计,并通过两次阈值处理以减少运算量、提高运算效率。通过对风电机组监测振动数据分析,证明了该方法可以有效地实现背景噪声的消除和故障诊断。

基于混合动态主元分析的故障检测方法

针对基于动态主元分析的故障检测方法存在的主元个数较多以及计算效率低等问题,本文提出基于混合动态主元分析(Hybrid Dynamic Principal Component Analysis,HDP-CA)的复杂过程故障检测方法。该方法采用分步策略消除数据之间的自相关和互相关性,提高了故障检测的精度和效率。对TE过程典型故障和热连轧过程中断带故障检测结果表明:HDPCA方法提取的主元个数少于DPCA方法提取的主元个数。并且,基于HDPCA的T2和SPE统计量的检测性能和检测精度都由于基于DPCA的统计量。因此,本文提出的方法可以准确有效地检测出故障。

中巴资源一号卫星水体信息提取方法研究

选取中巴资源一号卫星(CBERS-1)CCD数据南京幅典型地区作为研究区,其范围为1 262×1 295像元区域.通过分析不同水体在不同波段的光谱特征,及山区阴影对水体提取的影响,提出了一种新的水体遥感信息提取方法一迭代混合分析方法,适合于亮度值偏低的中巴资源一号卫星数据.利用该方法进行了水体信息提取实验,实验效果良好.因此,通过水体信息提取,中巴资源一号卫星数据可为洪涝灾害评估预测提供基础数据.

基于文献计量学的科学结构及其演化的研究方法述评

首先介绍几种主要的基于文献计量学的科学结构及演化研究方法,包括基于引文分析的方法、基于文本挖掘的内容词分析方法以及基于引文和内容词的混合分析方法,然后对这几种方法的优劣进行对比,最后建议将混合方法进一步应用于科学结构及演化研究及新兴趋势的探测,同时加强方法对比研究,以便针对不同的研究领域或者数据范围选择适当的方法,希望不同的混合方法能为情报学带来新的研究思路和方法,促进情报学的发展。

数字式自动驾驶仪控制回路仿真分析与设计

介绍了数字式导弹自动驾驶仪控制回路分析与设计的三种方法 ,即连续化方法、离散化方法和连续 /离散混合系统设计方法 .讨论了这三种设计方法各自的优缺点及在设计过程中需要注意的问题 ,并通过一个具体的仿真实例验证了所得出的结论 .

基于Kriging代理模型的中频结构振动可靠性分析

本文通过Kriging代理模型开展了中频振动的结构可靠性分析。复杂结构在动态激励下会出现长、短波变形共存的中频振动现象。混合有限元-统计能量分析方法是一种有效的中频振动响应分析方法。在短波组件采用统计能量分析建模的基础上,本文通过概率模型将长波组件建立为随机子系统。考虑到混合模型单次响应分析的计算量过大,本文采用拉丁超立方抽样结合Kriging插值建立代理模型取代原物理模型求解可靠度。数值算例表明,较之对物理模型进行直接蒙特卡洛模拟的方法,代理模型的计算效率可以提高上百倍。

滇-型杂交水稻质核雄性不育恢复基因的SSR分子标记

用混合品集分析方法 (BL A) ,在保持系和恢复系中的 DNA各取 2 0个样混合 ,对 PMRF、OSR- 33、RM2 94、RG30 4、RG2 5 7和 RM2 2 8六对引物进行筛选 ,结果发现 PMRF、OSR- 33和 RM2 2 8三对 SSR引物在保持系和恢复系的混合之间有遗传差异。用这三对引物分别对不同的 4 0个保持系和 6 0个恢复系 DNA样品进行扩增。另外 ,用滇 -型杂交粳稻的保持系 4 0份和恢复系 6 0份与不育系进行测交 ,杂种 F1 花粉的育性经 1 %的 I- KI染色 ,其花粉的可育率有高有低。用扩增出的带型与 F1 花粉的育性进行相关分析 ,结果表明扩增出带型与花粉的育性呈显著正相关 ,两种带型对应的花粉可育率均值经 t测验差异极显著 ,表明 PMRF、OSR- 33和 RM2 2 8标记与滇 -型细胞质雄性不育育性恢复基因连锁 ,并且PMRF、OSR- 33SSR和 RM2 2 8引物是设计在第 1 0染色体长臂的中部 ,所以 ,滇 -型细胞质雄性不育育性恢复的一个基因可初步定位于第 1

药品专利反向支付协议反垄断分析模式的重构——以我国首例反向支付协议审查案为中心

“首例反向支付协议审查案”的落槌,标志着药品专利反向支付协议的涉垄断问题正式进入我国有关部门的视野。然而,任何单一的分析模式均难以准确识别药品专利反向支付协议的违法性,占据主流的合理原则概莫能外。最高人民法院在该案中运用的混合分析模式兼具可塑性和确定性,有望成为我国规制药品专利反向支付协议的新范式。鉴于此,本文从最高人民法院的审理思路出发,梳理了该模式在效果分析、效力审查和豁免条款方面的难点,并依据药品专利反向支付协议的特性和我国知识产权反垄断领域的规则提出了矫正和完善的建议。

药品专利反向支付协议的反垄断规制——欧美的经验与启示

反向支付协议客观上具有维持药品价格超竞争水平的效果,极易构成以牺牲消费者利益为代价的横向垄断协议。我国横向垄断协议的规制原则不明确,援引至反向支付协议反垄断规制时存在重大分歧,而反向支付协议的特殊性使该问题进一步复杂化。比较法视野下,欧盟混合分析方法侧重于审查价值转移的合理性,其假定前提因未考虑基础专利的强阻碍作用而存有瑕疵。美国合理原则将专利诉讼的可能结果和反向支付的必要性作为考量因素,可有效弥补混合分析方法的缺陷。因此,对反向支付协议反垄断规制时,可将药品专利依据专利强度一分为二:基础专利和次级专利,结合我国反垄断法制度体系、实施体制和药品产业现状综合判断,分别借鉴美国合理原则和欧盟混合分析方法,以实现竞争利益的内部平衡。在外部平衡层面,缔约方可基于个案豁免原则适用比例原则限制下的公共政策抗辩。

Dynamic analysis and experimental study of vibro-acoustic system with uncertainties at middle frequencies

To take into account the influence of uncetainties on the dynamic response of the vibro-acousitc structure, a hybrid modeling technique combining the finite element method（FE）and the statistic energy analysis（SEA） is proposed to analyze vibro-acoustics responses with uncertainties at middle frequencies. The mid-frequency dynamic response of the framework-plate structure with uncertainties is studied based on the hybrid FE-SEA method and the Monte Carlo（MC）simulation is performed so as to provide a benchmark comparison with the hybrid method. The energy response of the framework-plate structure matches well with the MC simulation results, which validates the effectiveness of the hybrid FE-SEA method considering both the complexity of the vibro-acoustic structure and the uncertainties in mid-frequency vibro-acousitc analysis. Based on the hybrid method, a vibroacoustic model of a construction machinery cab with random properties is established, and the excitations of the model are measured by experiments. The responses of the sound pressure level of the cab and the vibration power spectrum density of the front windscreen are calculated and compared with those of the experiment. At middle frequencies, the results have a good consistency with the tests and the prediction error is less than 3. 5dB.

身份约束、动机驱动或寻求资本:企业家缘何政治参与

政治参与对民营企业家发挥企业家精神,促进社会政治经济发展具有重要作用。随着亲清政商关系理念的提出,企业家在政治参与中的主体地位越来越凸显。本研究基于现有文献,构建出政治身份、亲社会动机与社会资本三位一体的影响理论模型,运用混合研究方法分析变量间的相关性和组态效应,从企业家的主体视角厘清企业家政治参与意愿的影响机制。研究发现,政治身份、亲社会动机与社会资本对企业家的政治参与意愿有着显著的正向影响,而社会资本是其核心条件,即只要存在较强的社会资本,无论是否具有政治身份和亲社会动机,企业家的政治参与意愿会更强。本研究探讨了企业家政治参与的归因,为相关部门建设多元化政企互动渠道、促进企业家参与政企互动提供理论启示与实践建议。

Security analysis of access control model in hybrid cloud based on security entropy

To resolve the problem of quantitative analysis in hybrid cloud,a quantitative analysis method,which is based on the security entropy,is proposed.Firstly,according to the information theory,the security entropy is put forward to calculate the uncertainty of the system' s determinations on the irregular access behaviors.Secondly,based on the security entropy,security theorems of hybrid cloud are defined.Finally,typical access control models are analyzed by the method,the method's practicability is validated,and security and applicability of these models are compared.Simulation results prove that the proposed method is suitable for the security quantitative analysis of the access control model and evaluation to access control capability in hybrid cloud.

Optimization of machining parameters in drilling hybrid aluminium metal matrix composites

Taguchi method with grey relational analysis was used to optimize the machining parameters with multiple performance characteristics in drilling hybrid metal matrix A1356/SiC-mica composites. Experiments were conducted on a computer numerical control vertical machining centre and Lzs orthogonal array was chosen for the experiments. The drilling parameters namely spindle speed, feed rate, drill type and mass fraction of mica were optimized based on the multiple performance characteristics including thrust force, surface roughness, tool wear and burr height （exit）. The results show that the feed rate and the type of drill are the most significant factors which affect the drilling process and the performance in the drilling process can be effectively improved by using this approach.

Analytical Algorithms for the Blend Ratios by Fibre-bundle Tensile Curves Part I: Typical Tensile Curve and the Strength and Work Methods

The blend ratio and tensile properties are vital important characteristics of blended fibre bundles. Fibre-bundle tensile behaviour has been measured by means of the Sirolan-Tensor in order to derive a typical specific stress — extension curve. According to the typical tensile curve, the relationships between the blend ratio and the tensile parameters are discussed and established. Two new algorithms, so-called the strength method and the work method, have been developed for the blend-ratio estimation of blended fibre bundles. The relevant blend-ratios and calculations of the two methods are defined in detail. Also, the characteristics have been explained for every calculation and compared to each others. The experimental results show that the blend ratios estimated from the theoretical methods are high coincidence with the measured results. Meanwhile, the specific stress — extension curve of blended fibre bundles depends directly on the blend ratios of the fibre bundles.

Vibration Analysis of Vehicle Floor Panel Using Hybrid Method of FEM and SEA

In order to improve the mass efficiency of an automotive soundproof package, it is important to predict the middle to high frequency range of noise and vibration during vehicle operation. A hybrid method of experimental and analytical SEA （statistical energy analysis） has been applied for the prediction of air-borne noise. However, for predicting structure-borne noise, there are no definitive simulation methods that can address the soundproof specifications in an actual vehicle. Thus, in this paper, a FEM （finite element method）＇SEA hybrid method is used. The FEM＇SEA hybrid method predicts structure-borne noise in the middle to high frequency range. First, we explain the basic concept of the FEM＇SEA hybrid method; Second, we describe our experiment to verify the analytical results of the FEM＇SEA hybrid method; Third, we provide the details of the FEM model versus the FEM＇SEA hybrid model; Finally, we verify the validity and availability of the FEM＇SEA hybrid method through comparisons of the FEM analysis results, FEM-SEA analysis results and measured results.

Towards an Egyptian Mobile Banking Era

Banks have moved towards technology-based customer services such as mobile banking （m-banking）; as an alternative to traditional inter-personal services. However, M-banking still faces resistance that may hamper customers＇ adoption in Egypt. Following a mixed method approach, this study involves two main phases. First, a quantitative Consumer survey is conducted in the form of 350 structured questionnaires to identify the main barriers towards m-banking. Then, decision makers in 5 different public and private banks are interviewed in order to find similarities and difference, and identify service providers＇ roles regarding these barricrs. Questionnaire data was statistically analysed using independent T-Test, Chi-squares, frequencies and cross tabulations, while interview data was interpretively analysed. Results enabled the researchers to identify the risk, usage, and tradition as the most m-banking barriers that discourage m-banking adoption in Egypt as seen by the two main players.

Convergence Study of Chinese Carbon Intensity

This paper establishes the theoretical hypothesis of carbon intensity convergence, and through statistics to analyze and describe the whole country and the eastern and western regions with the use of mixed regression model and fixed effects regression method, and test σ -convergence, absolute convergence and conditional convergence in order to have an empirical study on carbon convergence hypothesis.

Hybrid method of limit equilibrium and finite element internal force for analysis of arch dam stability against sliding

A hybrid method of limit equilibrium and finite element internal force for analysis of arch dam stability against sliding is presented.The finite element internal force method(FEIFM) is used to provide more accurate thrust forces acting on the faces of a slip body,and the limit equilibrium method(LEM) is employed to evaluate the factor of safety of the slip body.The method presented can deal with a slip body with large amount of geometrically complex slip faces.In addition,compared with the traditional LEM,it can meet the balance condition of the forces in the slip faces.An example shows that the factor of safety obtained by the method presented agrees well with the theoretical solution.A practical example is also presented to demonstrate the application of the method in the stability analysis of an arch dam project.The results from the examples show that the method is promising in analysis of arch dam stability against sliding.

Uniform analysis of a stabilized hybrid finite element method for Reissner-Mindlin plates

This paper presents a low order stabilized hybrid quadrilateral finite element method for ReissnerMindlin plates based on Hellinger-Reissner variational principle,which includes variables of displacements,shear stresses and bending moments.The approach uses continuous piecewise isoparametric bilinear interpolations for the approximations of the transverse displacement and rotation.The stabilization achieved by adding a stabilization term of least-squares to the original hybrid scheme,allows independent approximations of the stresses and moments.The stress approximation adopts a piecewise independent 4-parameter mode satisfying an accuracy-enhanced condition.The approximation of moments employs a piecewise-independent 5-parameter mode.This method can be viewed as a stabilized version of the hybrid finite element scheme proposed in [Carstensen C,Xie X,Yu G,et al.A priori and a posteriori analysis for a locking-free low order quadrilateral hybrid finite element for Reissner-Mindlin plates.Comput Methods Appl Mech Engrg,2011,200:1161-1175],where the approximations of stresses and moments are required to satisfy an equilibrium criterion.A priori error analysis shows that the method is uniform with respect to the plate thickness t.Numerical experiments confirm the theoretical results.