Novel N-hit single event transient mitigation technique via open guard transistor in 65 nm bulk CMOS process

In this paper,we proposed a new n-channel MOS single event transient(SET) mitigation technique,which is called the open guard transistor(OGT) technique.This hardening scheme is compared with several classical n-channel MOS hardening structures through 3-D TCAD simulations.The results show that this scheme presents about 35% improvements over the unhardened scheme for mitigating the SET pulse,and its upgrade,the 2-fringe scheme,takes on even more than 50% improvements over the unhardened one.This makes significant sense for the semi-conductor device reliability.     

城镇地籍调查控制网的布设探讨

结合漳州市城镇地籍调查控制网的布设,介绍采用GPS技术进行静态布网以及采用RTK进行等级较高控制网观测的具体实施方法、技术要求以及精度分析.提出在城镇调查控制布网中采用GPS结合常规导线测量作业方法的可行性.同时针对在布网过程中遇到的问题提出几点建议.     

混凝土搅拌站的安装与调试

介绍了混凝土搅拌站的结构和安装方法;论述了混凝土搅拌站的安装调试是确保设备安全运行的重要环节;强调了安装调试人员技术水平和技术素养是保证设备安装质量的关键所在。     

Research on anti-contact fatigue performance of grease containing nano SbSbS4 particles

The rise of nano-technology has recently madenano-tribology a rapidly developing area of study[1].Nano-tribology is the mostup-to-date partof tribology[2].Nanoparticles as an additive to grease can create a solid-liquid fluid lubricant, which surprisingly improves the ca-pability of the grease. Manyscholars have investigated thefriction and wear capability of nano-additives[3-8].SbSbS4is a type of extreme pressure and anti-frictionadditive with excellent capabilities. The addition of asmall …     

Changes in the sediment load of the Lancang-Mekong River over the period 1965-2003

Changes in the sediment load of a river can have important impacts on river channel evolution,nutrient fluxes,aquatic ecology and delta erosion and sedimentation,and the possibility of changes in the sediment load of the Lancang-Mekong River has attracted increasing concern in recent years.Existing studies present conflicting findings regarding the nature and magnitude of recent changes in the sediment load of the Lancang-Meking River and the authors have attempted to assemble the most reliable data on annual sediment loads for the period 1965-2003,to assess recent trends in the sediment load of the river.The changes in annual sediment load at 7 stations on the river are analyzed.Important sediment contributing areas are found in the reaches between Gajiu and Yunjinghong,Chiang Saen and Luang Prabang and downstream of Nong Khai.The sediment load increased at Gajiu,Yunjinghong and Chiang Saen over the period 1985-1992 because of serious soil erosion caused by the expansion of cultivation,the replacement of natural forest by plantations and land disturbance associated with hydropower dam construction.A marked reduction in sediment load occurred at Gajiu after the impoundment of the Manwan Hydropower dam on the Lancang River,but this reduction was not evident downstream at Yunjinghong and the stations further downstream.Significant increases in sediment load appeared at Mukdahan and Khong Chiam.These contrasting patterns of change reflect the influence of sediment contributions from the intervening catchment areas and channel systems as well as storage and remobilization of sediment from the channel system and the impact of hydraulic works such as irrigation systems.The long term mean annual sediment load of the Mekong River at its mouth is estimated to be ca.145×106ta-1,which is lower than previously reported values and it seems likely that this will be reduced in the foreseeable future.     

S-粗集与新金属材料发现（Ⅰ）

给出遗传知识，S-粗集的遗传概念；提出S-粗集的F-遗传定理，-↑F-遗传定理，（F，-↑F）-遗传定理；讨论了（F，-↑F）-遗传与F遗传的关系，（F，-↑F）-遗传与-↑F-遗传的关系，利用这些结果，本文给出属性值遗传的概念，提出属性值遗传链定理和属性遗传定理，这些结果是研究金属遗传特性的重要理论准备，这些结果在讨论金属遗传特性（本文第Ⅱ部分）中得到了应用，S-粗集的遗传特性与金属的遗传特性之间潜藏着密切的联系。     

A multiphase mesostructure mechanics approach to the study of the fracture-damage behavior of concrete

A multiphase mesostructure mechanical model is proposed to study the deformation and failure process of concrete considering its heterogeneity at the meso scopic level. Herein, concrete is taken as a type of three-component composite material composed of mortar matrix, aggregates and interfaces on the meso-scale. First, an efficient approach to the disposition of aggregates of concrete and a state matrix method to generate mesh coordinates for aggregates are proposed. Secondly, based on the nonlinear continuum damage mechanics, a meso-scale finite element model is presented with damage softening stress-strain relationship for describing the mechanical behavior of different components of concrete. In this method, heterogeneities of each component in the concrete are considered by assuming the material properties of three components conform to the Weibull distribution law. Finally, based on this multiphase meso-mechanics model, a simulation analysis of fracture behavior of a rock-fill concrete (RFC) beam is accomplished. The study includes experimental tests for determining basic mechanical parameters of three components of RFC and four-point flexural beam tests for verification of the model. It is preliminarily shown that the numerical model is applicable to studying failure mechanisms and process of concrete type material.

     

Research on assessment method of intrasystem and intersystem of the global navigation satellite system

The global navigation satellite system(GNSS) has become an important space infrastructure. Following GPS and GLONASS, Europe and China have been building their own global navigation satellite system, respectively, GALILEO and Compass. In order to consolidate the leadership of GPS in the globe, United States is gradually upgrading the traditional GPS. Simultaneously, Russia is also intensively restoring full performance of GLONASS. With the advancement of international satellite navigation system, satellite navigation frequency resources are already in short supply, and the design and use of the navigation signals are more sophisticated and complex due to commercial, disaster relief and other reasons. Since there may be many navigation signals in the same basic bandwidth, the coexistence of multiple systems and the combined application make intersystem mutual interference become the focus research. Under this background, the satellite navigation system mutual interference evaluation system needs to be established urgently to meet and support the compatibility and interoperability of the GNSS system. In the paper, through the performance analysis of the GNSS signal acquisition, carrier tracking, data demodulation and code tracking, the equivalent carrier to noise ratio model based on spectrum isolation coefficient is established, and the theoretical system of the GNSS signal mutual interference is proposed according to the mechanism, and the mutual interference of GPS, GALILEO and Compass system is analyzed and assessed.     

生物特征识别标准化概述

系统介绍了生物特征识别的国际标准化状况．简要描述了国内生物特征识别标准的现状．并对我国生物特征识别标准化的进一步发展提出了个人建议，