CNTs／Al2O3复合材料嵌入型显微结构的设计及影响因素分析

为获得好的强韧化效果,提出了适合碳纳米管强韧化陶瓷基复合材料的嵌入型显微结构模型,应用杂凝聚法,分别采用单壁、多壁及定向碳纳米管复合,制备了具有该种结构特征的复合材料。对比研究了上述三种CNTs/Al2O3复合材料显微结构的差异及对复合材料性能的影响。结果表明,碳纳米管种类、形态及分散性对嵌入型显微结构的形成有影响,细且直的单壁碳纳米管有利于形成嵌入型显微结构。

学习型组织创建效果评价指标体系的构想

笔者从构筑学习环境及学习机制的角度出发,创建了学习型组织的测评指标体系。指标体系各部分呈“人”型结构。其中,企业文化是组织学习的环境,指导观念是“组织学习人”的“大脑”,组织学习机制是“组织学习人”的“身体”,领导者和组织成员是“组织学习人”的“双脚”,组织结构和信息技术是“组织学习人”的“双手”。这七个部分为组织学习构筑了良好的学习环境和学习机制,构成了测评学习型组织创建效果的指标体系。

Optimization method of reef structure design based on hydrodynamic model

Artificial fish reef is a kind of artificial structure in water,which provides a necessary and safe place for aquatic life such as fish to inhabit,grow,and breed,and creates an environment suitable for fish growth,so as to protect and multiply fishery resources.In a large time scale,the physical process of sea area can deeply affect the chemical process and biological process,so the structure characteristics of artificial reef are the key factors affecting the flow field effect around the reef.In this study,through the hydrodynamic experiments of four kinds of reef models,including big windows box reef,big and small windows box reef,"(卐)"shaped reef and double-layer shellfish breeding reef,the influence of single reef structure on the flow field effect is analyzed,and the force conditions of different reefs under the same incoming current velocity are obtained.According to the simulation results,the safety research and calculation of five kinds of reef models are carried out,and the volumes of vortex area and upwelling area behind four kinds of reef are obtained.Using hydrodynamic model to simulate the flow field effect of reef area,optimizing the reef structure design,improving the maximum biological trapping and proliferation effect of reef,can provide theoretical guidance and scientific and technological support for the construction of reef area.

Design and Realization of CPW Circuits Using EC-ANN Models for CPW Discontinuities

Novel accurate and efficient equivalent circuit trained artificial neural-network （EC-ANN） models,which inherit and improve upon EC model and EM-ANN models＇ advantages,are developed for coplanar waveguide （CPW） discontinuities. Modeled discontinuities include ： CPW step, interdigital capacitor, symmetric cross junction, and spiral inductor, for which validation tests are performed. These models allow for circuit design, simulation, and optimization within a CAD simulator. Design and realization of a coplanar lumped element band pass filter on GaAs using the developed CPW EC-ANN models are demonstrated.

On the ways of cultivating the creativity of talents

The creative talents are of constructive significance to the development of the country. Starting from the early exploration and the scientific definition of the creativity of the talents, this article summarizes the research achievements of the creativity of talents in China from three aspects of the determination of the nature and the research of the structural model, the research of the relationship between creativity and other factors, and the development and research of the cross cultural creativity. And from the perspective of the theory and the practice, the author puts forward the ways to cultivate the creativity of the talents from the five dimensions of optimizing the development of the brain functions, improving the abilities of the thinking, judgment and control, debugging the emotional stability and the creative personality, striving to improve the teachers＇ creativity, and drawing lessons from the practical experience of training innovative talents in western countries.

Religion as Conscious Cognition and Behavior

Cognitive and behavioral research on religion has focused most in the last years on aspects which could be deemed ＂unconscious＂： inner mechanisms, innate patterns, or hidden cognitive structures broadly shared by humans. Very often, the ongoing research programs resort to computational models of mind in which the conscious side of that experience is mainly ignored. It becomes urgent to fill in the perceived gap, suggesting some lines of study that are able to account for the conscious dimensions of religion. An opportunity is offered by the new paths recently opened by extensive experimental research on conscious aspects of human experience and the value that leads authors to attribute to these features. Seizing on this opportunity, the paper reviews the state of the question and the available literature on conscious and unconscious aspects of mind and behavior. Taking it a step further, the paper tries to apply these general principles to the specific study of religious mind and behavior. Furthermore, some lines for future research are proposed as a result of the suggested program.

Design, Analysis, Fabrication, and Test for Low-Cost and Out-of-Autoclave Composite Airship Gondolas

Out-of-autoclave(OoA) processing has the advantages of low cost,light weight and environmental protection,and has become a hot spot in the field of composite materials worldwide. This paper investigates the application of OoA processing in the gondola of the AS700 civil manned airship. The production cost of gondolas is reduced by selecting low cost materials such as glass fiber,PVC foam and OoA processing. The porosity of parts is reduced and controlled at about 2% by optimizing the edge breathing of prepreg during curing. The maximum tensile strain of the glass fiber is 4 593 με;its maximum compressive strain is 3 680 με;and its maximum shear strain is4 884 με. The maximum Von Mises stress of the foam is 0.70 MPa. These settings all meet the margin requirement of safety. Finally,the ultimate load test of the gondola is carried out to verify the safety of the gondola structure. Our study presents critical parameters for the gondola design,including load,structure,strength,and manufacturing process test,and provides certain references for the design of similar products.

On the ways of cultivating the creativity of talents

The creative talents are of constructive significance to the development of the country. Starting from the early exploration and the scientific definition of the creativity of the talents, this article summarizes the research achievements of the creativity of talents in China from three aspects of the determination of the nature and the research of the structural model, the research of the relationship between creativity and other factors, and the development and research of the cross cultural creativity. And from the perspective of the theory and the practice, the author puts forward the ways to cultivate the creativity of the talents from the five dimensions of optimizing the development of the brain functions, improving the abilities of the thinking, judgment and control, debugging the emotional stability and the creative personality, striving to improve the teachers＇ creativity, and drawing lessons from the practical experience of training innovative talents in western countries.

Analysis and comparison of three leg models for bionic locust robot based on landing buffering performance

Good landing buffering performance can reduce impact and vibration for the bionic locust jumping robot; thus, a landing buffer is important in evaluating the motion performance of the bionic locust robot. In particular, the legs of the robot are the main structures that realize the buffer; thus, its structure affects buffering performance. Three typical leg structure models are established based on the physiological analysis of the locust leg and research status, namely, bionic leg, multi-constraint leg, and arc legs. Kinematic and force analyses are conducted for these types of legs. Particularly, flexible deformation of leg link is considered in the analysis to describe the movement process accurately. In order to compare the buffering performance of these types of legs quantitatively, the performance indices with maximum buffering distance, the energy absorption capability, and the mechanical property are presented. Based on the performance indices, the structure parameters are analyzed and optimized. The buffering performance of the three leg structures is compared with the comprehensive performance of different structures in each best state. This study offers a quantitative analysis and comparison for different legs of bionic locust jumping robot based on landing buffering performance. Furthermore, a theoretical basis for future research and engineering applications is established.

A review of heavy-duty legged robots

Heavy-duty legged robots have been regarded as one of the important developments in the field of legged robots because of their high payload-total mass ratio,terrain adaptability,and multitasking.The problems associated with the development and use of heavy-duty legged robots have motivated researchers to conduct many important studies,covering topics related to the mechanical structure,force distribution,control strategy,energy efficiency,etc.Overall,heavy-duty legged robots have three main characteristics:greater body masses,larger body sizes,and higher payload-total mass ratios.Thus,various heavy-duty legged robots and their performances are reviewed here.This review presents the current developments with regard to heavy-duty legged robots.Also,the main characteristics of high-performance heavy-duty legged robots are determined and conclusions are drawn.Furthermore,the current research of key techniques of heavy-duty legged robots,including the mechanical structure,force distribution,control method,and power source,is described.To assess the transportation capacity of heavy-duty legged robots,performance evaluation parameters are proposed.Finally,problems that need further research are addressed.

MODELING THE SPREAD OF HIV IN A STAGE STRUCTURED POPULATION： EFFECT OF AWARENESS

Human immunodeficiency virus （HIV） is a lenti-virus （a member of the retrovirus family） that causes acquired immunodeficieney syndrome （AIDS）, a critical condition in humans in which progressive failure of the immune system allows life-threatening opportunis- tic infections. Over the past few years HIV has been spreading rapidly in the popula- tion. Almost, everyday there are thousands of new human cases of HIV infection being recorded in the world and these occur in almost every country of the world. However, the spread of HIV is relatively faster in the developing countries as compared to developed countries because developing countries have limited resources. Worldwide, 70% of HIV infections in the adults have been transmitted through heterosexual contact and vertical transmission accounts for more than 90~ of global infection in infants and children. In this paper, we propose a nonlinear mathematical model to study the spread of HIV by considering transmission of disease by heterosexual contact and vertical transmission. A stage structured model is proposed and analyzed by considering the total population variable and dividing the whole population under consideration into three stages： chil- dren, adults and old. Also, in this paper it is assumed that the rates of recruitment are different in different groups of population. Equilibria of the model and their stability are also discussed. Using the stability theory of differential equations and computer simu- lation, it is shown that due to the increase in the awareness of the disease in the adult class the total infective population decreases in the region under consideration.