HPM作用下27系列EPROM存储器失效的实验研究

在高功率微波辐射下，２７系列ＥＰＲＯＭ存储器呈现出暂时失效及永久失效两种情况。进一步的研究表明，在较低功率密度电磁波辐射下，器件失效的主要原因是场的作用；     

基于零折射率超材料的新型匹配高增益贴片天线

针对基于零折射率超材料的矩形贴片天线的快速设计,提出了应用微遗传算法的自动优化方案,建立了利用Visual Basic语言编程调用时域有限差分方法对该天线的参数进行自动优化的计算机仿真程序,并成功计算出了优化的参数数据.采用优化数据加工制作了天线实物并进行了测量,仿真和实测结果吻合良好,零折射率材料对矩形贴片天线增益提升超过10 dB,实现了最高16.2 dBi的增益,并且在11.7 GHz到12.6 GHz的频带范围内阻抗匹配良好,证明了该方案的有效性和可靠性.     

A Review of Computer-Generated Simulation in the Pedagogy of Cataract Surgery Training and Assessment

Virtual reality simulation is no longer an unusual term due to its application in aviation, industry, medicine, and military. The limitation of animal model in wet-lab training has necessitated the discovery of new training tools. Criteria-based surgical training can be simulated in a protected environment virtually by using computer for medical assessment and evaluation. This article reviews the pedagogical value of various virtual reality cataract surgery simulators developed, in surgical skill education and evaluation. Literature searches were conducted in ACM, IEEE Xplore, PubMed, Taylor & Francis, SciVerse, and Springer Link, covering the period from 1990 to the present. The published literature that presents methodological approach in the creation of simulation and feasibility study on performance evaluation system were examined. Evidence from the study proves that high-fidelity simulation is capable of providing objective surgical training and distinguishing the level of competency between students, residents, and surgeons in cataract surgery. Standardization and classification of training module according to the proficiency of surgical skills are considered necessary in improving validity of simulators as part of curriculum in medical education.     

Inter-Municipal Landfill Site Selection Using Analytic Network Process

Selecting the most suitable landfill site is important to prevent any negative ecological and socio-economic effects. Spatial analysis takes into consideration local environmental regulations and adopted acceptance criteria that are important considerations in site selection. This paper is a case study to determine the suitability of an inter-municipal solid waste landfill site for the city of Khomeynishahr and its six adjacent cities, with a total population of half a million people. A multi-criteria evaluation method emphasising geographical information systems (GIS) techniques was used to identify suitable landfill sites. A combination of Boolean logic, Fuzzy logic and Analytic Network Process (ANP) was used for prioritising the associated criteria and selecting a suitable landfill site. This method is capable of being applied to complex problems with uncertainty and non-hierarchical structure and allows for the consideration of interdependence relationships of decision criteria within and between levels. Taking advantage of the ANP method, the selected landfill site priorities can be identified by considering the variation and relative importance of decision criteria for each site, which cannot be considered in other decision-making methods, such as Analytic Hierarchy Process (AHP). The results showed the significant importance of residential area and water resources protection in landfill site selection. This study indicates that the integrated method can provide environmental decision makers and planners with a promising tool.     

Study on the key problems of interaction between microwave and chemical reaction

Microwave has been found as an efficient heating method in chemical industry. However, in present days the interaction between microwave and chemical reactions has not been deeply understood, which restricts a wider application of high power microwave in chemical industry. In this paper, the key problems of interaction between microwave and chemical reaction are investigated, such as complex effective permittivity of chemical reaction, simulation of microwave heating on chemical reaction and non-thermal effect of microwave, which will enhance further knowledge of the mechanism of interaction between microwave and chemical reaction. Moreover, such an analysis is beneficial for handling with difficulties in application of microwave chemical industry. __________ Translated from Chinese Journal of Radio Science, 2006, 21(5): 802–809 [译自: 电波科学学报]     

CFD insight of the flow dynamics in a novel swirler for gas turbine combustors

We describe the flow dynamics inside a novel swirler conceptualized for gas turbine combustors. The supreme advantage in this swirler is the ability to vary the swirl number for the same value of Reynolds number. The significance of such advantage against contemporary configurations, which have constant swirl number, is quite evident at low turbine operating loads. The novel geometry and flow pattern are described in details in the present work. The results of four numerical simulations are presented and discussed to study the central recirculation zone, turbulence intensity, and pressure drop at different swirl numbers. The new concept is deemed to enhance the combustion efficiency because of its ability to adjust the swirl number according to the turbine operating load. The current study reports preliminary results which verify the concept behind the proposed swirler. However, intensive numerical and experimental studies are necessary to be carried out in order to characterize the flow dynamics produced by the novel swirler and its impact on the combustion process.     

A simple method for calculating electric and magnetic fields inGTEM cell

A method based on coordinate transformation is presented to calculate the electric and magnetic field distributions in gigahertz TEM cells (GTEM cells). Here quasi-static approximations are employed, therefore the results are valid once operational frequencies well below the cutoff frequency of the cell. The method is illustrated by calculating the fields in a typical test structure. The results indicated here are useful in radiated emission and susceptibility studies     

应用电磁波剔除早期失效的半导体器件

本文根据在横电磁波作用下半导体中载流子运动方程的解说明了电磁波对半导体器件同时具有热与非热效应作用。用实验证实了电磁波对半导体器件参数的影响,并给出了一批产品的早期失效曲线。说明了应用电磁波剔除早期失效半导体器件具有时间短,安全的优点。最后介绍了试验的系统和设备。     

Design and implement of the signal generator in the magnetic focused conductivity tomography system

To improve stability and performance of the signal source and sweeping detection, as well as to extract abundant and reliable signal, the direct digital synthesis technology was employed to design the generator of the source which formed sweeping frequencies of sine wave output from 1 to 20 MHz. The planar spiral coil was connected as an amplitude modulation circuit. The same coil adopted differential architecture for signal detection and extraction. The MC1595 was utilized to compose a phase detector in which difference of phases varies with the change of frequencies. A low pass filter was designed to filter the carry waves of the sweeping source. Thereby the system gained abundant data and its stability was improved. Further, the spatial resolution of the system was enhanced. All of the above favors the use of software in the magnetic focused conductivity tomography system (MFCT) to reconstruct the image of conductivity within the human body. Translated from Journal of Sichuan University (Engineering Science Edition), 2006, 3(2): 155–158 [译自: 四川大学学报 (工程科学版)]