Modeling and Simulation Analysis of the Electromechanical Coupling Facts about Precision Transmission System

Electro-mechanical coupling facts about transmission system influence dynamic characteristic and response characteristic of servo system. The coupling factors of precision transmission system are put forward, and the modelling methods of electro-mechanical system are analyzed. Based on the large-scale precise horizontal machining center, the dynamic chart of servo feed system is gained through analyzing mathematical model of the taehes, and the influence on transmission stiffness and transmission error is simulated in precision transmission system. Through changing parameters in servo feed system, the influence on dynamic characteristic and response characteristic is analyzed, so it provides a mathematical model for parameter optimization.     

Coupled Vibration of Saturated Fractional Derivative Type Viscoelastic Soil of a Circular Tunnel with Partially Sealed Shell Lining

Considering the compression of medium and fluid, coupled vibration of saturated fractional derivative type viscoelastic soil and a circular tunnel with partially sealed shell lining in the frequency domain is investigated according to theories of Biot and elastic shell. The stress and displacement constitutive behavior of the soil skeleton is described by fractional derivative model which reflects the rheological properties of the medium while regarding soil as a liquid-solid saturated porous medium. The expressions of displacement, stress and pore water pressure are obtained while the inner boundary of circular tunnel is subjected to axially symmetric radial traction and axially symmetric fluid pressure respectively by introducing a partially permeable boundary condition. With the parameter analysis, it is revealed that the order of fractional derivative model on the responses for the system subjected to the symmetric radial traction is much greater than that of the system under the axially symmetric fluid pressure. And resonance phenomenon occurs obviously. Nevertheless the system responses do not have remarkable resonance phenomenon under axially symmetric fluid pressure.     

β-谷甾醇和γ-谷维素的结晶行为研究

利用X-射线衍射和扫描电子显微镜分析了β-谷甾醇、γ-谷维素及其混合物的结晶行为,从X-射线衍射分析可以看出快速冷却结晶可以促进β-谷甾醇、γ-谷维素及其混合物形成晶体。通过偏光显微镜观察发现,β-谷甾醇和γ-谷维素的添加量对油脂中的结晶体有明显的影响,且随着混合甾醇的添加量增加,晶体形成的尺寸也呈现增大的趋势,当混合甾醇的添加量为1%~3%时,晶体的形状呈现出细长的管状结晶,当添加量增大到3%以上时,晶体的结构呈现出互相交错的四瓣形聚集态,形似绣球菊,最终形成结构稳定的油脂凝胶。     

Analysis of Loosely Coupled Inductive Power Transfer System

In LCIPT system, the selection of system operation frequency has a relationshi Pwith the cost and power transfer capability of the power supply. Due to the development of Power device and system efficiency requirement , it is restricted to increase the system operation frequency . This paper presentes a topology which transfers power through LC oscillation. When the voltage of the capacitor is less than reference voltage, the switch is turned off and the capacitor is charged, which makes the switching frequency far less than the syntonic frequency. Thus the system efficiency is improved, and the system cost is reduced. This is verified by the time domain and frequency domain simulations of Saber. This topology not only can be used in LCIPT, but also in other convertors.     

Attractors of Partly Dissipative Reaction-diffusion Equation on Rn

We discuss the problem related to the long time behavior of solutions of the partly dissipative reaction-diffusion equations in unbounded domain,and prove the existence of the compact attractors.The coefficient of the reaction-term depends on space variables,which extend Wang B and Marion M's results.     

Application domain ontology to the construction of FDI effect evaluation system model

As a semantic foundation, ontology is extensively applied in areas such as information retrieval, artificial intelligence, semantic web and knowledge management and so on. This study adopts the ideas of reuse in software system model to combine the construction of an evaluation system and ontology against the static drawbacks in current construction of an evaluation system. It takes advantage of the concepts in domain ontology to make a domain stipulation and model mapping. Besides, it is the first time to apply the concepts to the construction of FDI evaluation system. It has important significance for socio-economic areas and it provides exploratory methods and routes for how component library can be reasonably adaptive and assemble the required components.     

Phase Behavior of W/O Microemulsion

The phase behavior of W/O microemulsion employed blend NPE4.2 and NPE10 as surfactants was studied. The influence of blend surfactant proportion, surfactant dose co-surfactant dose, various cations and temperature on W/O microemulsion phase behavior was examined by way of electric conductivity with the maximum dissolve water (solution) being the target. Experiments indicated that as the NPE 4.2 :NPE 10 is about 1.2:1 and (S+A):O is about 3:7, the maximum dissolve water was acquired. When the water was substituted by other cations solution or the temperature was increased, the effect to the microemulsion was resemble to the water. But the domain of W/O microemulsion is decreased.     

基于碳晶电热膜的温室育苗保温加温系统研究

为解决冬春季温室育苗环境温度低的问题,设计基于碳晶电热膜的温室育苗保温加温系统,并于冬季最冷时段在河北省永清县的连栋玻璃温室内对系统的保温加温性能进行实际测试.以无加温育苗试验区作为对照,研究分析碳晶电热膜根区加温对基质温度和空气温度的影响,探讨苗床上保温覆盖的保温作用和加温的均匀性.结果表明,单层膜保温覆盖可使加温育...     

基于压电效应的简易型细胞力学测试仪

针对传统的细胞力学研究方法的非无损性,不能对细胞力学参数连续、长期监测的特点,研制出一种基于石英晶体压电效应的简易型细胞力学测试仪。该测试仪以STM32 103C8 为核心,设计有石英晶体在液相环境下的起振电路、稳定振荡电路,采用了频率/电压转换电路。系统实现了对石英晶体频率变化的高精度采集,对与传感器耦合的界面层（细胞）的质量、粘弹性和表面应力多参数敏感,能对细胞黏附过程和细胞力学性能进行动态监测。通过整机在细胞培养液环境下的实验,验证了测试仪系统的可行性与稳定性。     

对铜绿丽金龟幼虫有活性的苏云金芽孢杆菌菌株的分离及鉴定

为了发掘新的斑资源,从3种不同土壤类型的样品中分离得到了285株苏云金芽孢杆菌菌株。采用杀虫活性测定方法从中获得了13株对铜绿丽金龟幼虫具有高毒力的菌株。利用PCR—RFLP鉴定体系和SDS-PAGE蛋白分析法,研究了这13株苏云金芽孢杆菌的杀虫晶体蛋白基因类型和晶体蛋白表达情况。结果显示,有12株均含有编码毒杀铜绿丽金龟幼虫毒素蛋白的cry8Ca基因,而FTL53没有鉴定到已有的基因类型。这13株菌的伴孢晶体都含有分子量为130kDa的蛋白。本研究为不断发现新型的、具有高毒力的cry毒素基因奠定了基础。     

Application on Extracting Feature in State Monitoring and Fault Diagnosis

With the development and application of information and internet and virtual instrument technology ,the virtual globular company based on internet arises .To study remote state monitoring, remote fault detection and diagnosis about large scale, complicated and integrative equipment become very important. In the whole fault diagnosis system , the detecting ,data acquisition is original ,processing; transform and extracting features with the signal detected is a key factor. The theories and methods used in mechanical fault diagnosis is stated. The application of signal process and its feature extracting methods is introduced which are time domain, frequency domain and time frequency domain analysis, in state monitoring and fault diagnosis with its signal analysis. The processing method of random time variant special signal is given also.     

白琵鹭(Platalea leucorodia)繁殖期行为谱及PAE编码系统

为了了解白琵鹭的行为特征以便于更好的保护,本研究采用焦点动物取样法和所有事件记录法对七星河保护区白琵鹭繁殖期的行为进行了观察,建立其繁殖期行为谱及PAE编码系统。本研究中共分辨并记录了白琵鹭的10种姿势、51种动作和92种行为;并将繁殖期白琵鹭的行为依其功能的不同分为16类,在PAE编码系统中把各种行为的相对发生频次与性别、年龄、季节的关系直接对应。结果表明：雌雄行为差别不大,只是雄性在繁殖期会出现求偶炫耀行为,雏鸟行为比较简单;繁殖期行为和个体行为中温度调节行为、通讯行为和杂项行为表现出季节性特点。     

Detecting EEG Sleep Spindles by Digital Filtering with Zero Phase Error

EEG signal is a kind of very complex non stationary signal. It is of important clinical values for using EEG most efficiently to distinguish all kinds of components in EEG or getting needed components to judge some pathology features effectively. The phase moving of the system can change the relative phase relation between the components in the inputed signal, so there can be a great change of the feature in time domain of inputed signal. The FRR and RRF digital filtering methods and their realization are discussed. By using these methods, the system can be of the feature of zero phase error, and the filtering of EEG signals with zero phase error can be realized. Based on the definition of sleep spindles, we can detect sleep spindles in time domain directly by using digital filtering with zero phase error.     

基于耗散结构理论的农业技术推广分析

农村社会是一个复杂的开放式的系统,农业技术推广所面向的对象正是农村社会这一复杂的系统。而耗散结构理论适合于揭示复杂、多变的现象,不论是自然科学领域,还是社会科学领域都可以应用耗散结构统一的理论来进行说明,因此试图结合耗散结构原理中开放、负熵流、非平衡、涨落等机理,分析农业技术推广系统中存在的问题,并且提出农业技术推广系统优化的建议。     

苏云金芽孢杆菌cry1Ea基因的克隆及 生物信息学分析

不同来源的苏云金芽孢杆菌能产生多种多样的晶体(Cry)蛋白。基于这个特性,人们可以通过基因工程的手段向工程菌中转入编码多种Cry毒素的基因来控制虫害。通过DNA重组技术,从Bt HZM2菌株中克隆出了cry1Ea基因,对其进行了生物信息学分析,同源比对结果表明,cry1Ea8基因的核苷酸序列与已知cry1Ea的同源性为99.77%~99.91%,对应的氨基酸序列同源性为99.49%~99.74%。对cry1Ea8基因的分析还揭示出了cry1Ea8及其编码蛋白的一些生物和理化性质。结构域预测表明,Cry1Ea8由3个结构域组成,其中N-末端螺旋状结构域与膜插入与孔隙形成有关,而第二和第三个结构域与受体的结合有关。该研究为转基因抗虫植物和微生物杀虫工程菌的构建提供了新的基因来源。     

Grain growth of continuous casting slab solidification based on cellular automata model

The cellular automaton (CA) method is coupled with finite difference method to establish a stochastic nucleation and growth model. According to the actual production conditions, the solidification structure of continuous casting slab is simulated and the evolution law of the inner structure is reconstructed. It is showed that grain transformation is from equiaxed crystal to columnar crystal and then to equiaxed crystal. Thickness of three crystal layers are different in various production technological systems, thickness of surface equiaxed crystal and inner equiaxed crystal are reduced, and the results of the columnar crystal thickness are contrary, while casting speed and superheat are increasing. The results show well agreement with the stochastic nucleation, preferred growth, competitive growth and random orientation of grain.     

Real-time Performance of Linux System

The standard Linux is a typical time-sharing system, it has a poor real-time performance. But according to the applications of the Linux OS are expanding on real-time domain, it becomes necessary to enhance the performance of the Linux system. This paper analyses the schedule policies and schedule algorithms of the Linux kernel, and discusses several different kinds of methods about enhancing real-time performance of the Linux system from the total Linux system. They authors summarizes the current research's developments of the Linux system.     

Analysis of IC Management System of Computer Room

This paper analyzes the features of existing IC management system of computer room, deficiencies and new orientation in this domain. The structure and realization of a new system developed by the authors was introduced. Meanwhile, this paper analyzes the electronic school schedule. Finally, the features of new IC management system of computer room are analyzed.     

Practical Method for Dynamical Analysis to the Interlayer Seismic Isolation Masonry Building with Frame Structure in the First Storey

Masonry buildings with R/C frame- shear wall in the bottom storey have been widely used in city construction, which include two kinds of lateral force resistant system. However, the seismic behavior of the building is poor. Based on the characteristics that the rigidity of the upper masonry structure is much bigger than the rigidity of laminated rubber bearings and frame structure. It can be referred to as system having a two degree of freedom. The dynamic behavior of this building is analyzed, the isolated vibration mode controls the response of system. The authors give apractical method for dynamical analysis to masonry building with frame structure in the first storey with laminated rubber bearings between the first and second storey , which submits efficient path to found applicable design means and to generalize interlayer seismic isolation structure.