信息家电控制接口电路设计及其FPGA实现

介绍了用于信息家电控制接口电路的一种实现方案，主要功能是自动接收串行数据并存入片内RAM，进行误码检测，并对控制码进行译码处理，发出对家电的开关控制指令。综合、仿真与测试结果表明设计的系统能完成预定的功能。     

Pore-level numerical simulation of methane-air combustion in a simplified two-layer porous burner

A simplified two-dimensional model of two-layer porous burner based on pore level is developed.The heat transfer of solid phase in porous burner is seen as the synergistic effects of conduction through con-necting bridges and surface radiation between the solid particles in the model.A numerical simulation study on the characteristics of flow,combustion and heat transfer in the two-layer porous burner is car-ried out using the pore level model,and the effects of the control parameters such as the inlet velocity and solid thermal conductivity on thermal non-equilibrium are investigated.The results show that the flame structure is highly two-dimensional based on pore level.Obvious thermal non-equilibrium in the burner for the two phases and solid phase are observed,the largest temperature difference between the gas and solid phases is observed in combustion zone,while the temperature difference inside the solid particles is largest near the flame front.The results also reveal that thermal non-equilibrium of por-ous burner is much affected by the inlet velocity and solid thermal conductivity.     

Modeling and global trajectory tracking control for an over-actuated MAV

This paper deals with an original micro aerial vehicle (MAV) design, the Omnicopter MAV. It has two central coaxial rotors with fixed-pitch propellers and three perimeter mounted ducted fans with servo motors performing thrust vectoring. Compared with traditional rotary wing MAVs that have inherent underactuation, the Omnicopter possesses some advantages in mobility, for example, lateral translation with zero attitude and hover with nonzero attitude. The trajectory tracking control design, global stability analysis, and control allocation are demonstrated through numerical simulation. The advantage of zero attitude translation is illustrated through experimental results.     

杭州市城西地区洪水出路研究

杭州市城西地区地势低洼,上承山水,下受杭嘉湖平原河流水位顶托,为易受洪涝灾害地区。以抵挡2007年"罗莎"台风洪水为目标,根据城西地区水系分布、城市布局,初步提出了洪水外排、湿地调蓄、建圩挡水的排涝布局及10种洪水出路方案。对10个方案从水位、水量、工程投资、对周边地区影响、政策处理等方面进行比较,最终提出以建设西溪湿地至钱塘江的地下排水通道、西溪湿地内部调蓄、分区建圩的组合方案为推荐方案。经分析认为,推荐方案可有效减轻杭州市城西地区的洪涝问题。     

电气检测领域电源稳定性核查方法

产品检测中电源具有十分重要的作用,本文以电动机检测实验室为例,介绍了电器领域中电源稳定性的核查方法。     

自动轴承加工车床控制器设计

系统设计的是一个自动轴承加工车床的控制器,以STC89C52HR单片机为控制器设计核心,辅助于8路输入控制电路、位置传感电路、电磁阀控制电路和显示电路,完成对车床加工动作的控制。信号的输入输出均以光耦隔离来实现,以提高单片机系统的抗干扰能力。系统通过测试和运行达到原设计要求,并具有高可靠性和实用性。     

Analytical Model for the Piecewise Linearly Graded Doping Drift Region in LDMOS

提出了体硅LDMOS漂移区杂质浓度分布的一种二维理论模型,根据该模型,如果要使带有场极板的LDMOS得到最佳的性能,那么LDMOS漂移区的杂质浓度必须呈分段线性分布.用半导体专业软件Tsuprem-4和Medici模拟证明了该模型十分有效,根据该模型优化得到的新型LDMOS的击穿电压和导通电阻分别比常规LDMOS增加58.8%和降低87.4%.     

Baseline Models for Bridge Performance Monitoring

A baseline model is essential for long-term structural performance monitoring and evaluation. This study represents the first effort in applying a neural network-based system identification technique to establish and update a baseline finite element model of an instrumented highway bridge based on the measurement of its traffic-induced vibrations. The neural network approach is particularly effective in dealing with measurement of a large-scale structure by a limited number of sensors. In this study, sensor systems were installed on two highway bridges and extensive vibration data were collected, based on which modal parameters including natural frequencies and mode shapes of the bridges were extracted using the frequency domain decomposition method as well as the conventional peak picking method. Then an innovative neural network is designed with the input being the modal parameters and the output being the structural parameters of a three-dimensional finite element model of the bridge such as the mass and stiffness elements. After extensively training and testing through finite element analysis, the neural network became capable to identify, with a high level of accuracy, the structural parameter values based on the measured modal parameters, and thus the finite element model of the bridge was successfully updated to a baseline. The neural network developed in this study can be used for future baseline updates as the bridge being monitored periodically over its lifetime.     

民国省会时期镇江的城市规划

民国时期,镇江作为江苏省的省会长达十一年之久。其中,抗日战争前的八年是镇江作为省会进行全面城市规划和建设的时期。本文以这一时期镇江的诸多城市规划文件及政策为研究对象,力图还原这一段由中国人自己主导的地方城市规划的历史。在此基础上,本文对这一时期的规划进行总结和评价,并提出对当前城市建设的可资借鉴之处。     

252Cf裂变γ射线伴随飞行时间法刻度液体闪烁体中子探测效率

宏观检验实验是检验核数据正确性的重要实验方法之一。液体闪烁体中子探测器是中子核数据宏观检验实验中快中子能谱测量的主要探测器，其探测效率曲线的准确性关系到实验结果的精度。本文采用²⁵²Cf中子源的伴随γ射线和飞行时间法测得了液体闪烁体对2.0～10.0 MeV中子的相对探测效率曲线，同时利用飞行时间法和400 kV脉冲中子发生器的d-D反应中子源测得了2.9 MeV单能中子的绝对探测效率。将相对探测效率曲线归一到单能点的绝对效率，得到探测器在这一能区的绝对探测效率曲线。使用蒙特卡罗程序NEFF模拟相同参数的液体闪烁体探测器对10.0 MeV以下中子的探测效率曲线。最后将实验结果与模拟结果对比，结果表明实验得到的探测效率曲线合理、准确。