建设工程项目管理浅析

对建设工程项目管理进行研究，通过对工程管理的模式，与项目管理学密切相关的基础学科（组织论）的讨论。分析实现项目目标的组织工具的优缺点分别进行分析，体现了在工程建设实践活动中运用科学的管理对工程目标实现的重要意艾。     

三维悬线式力矩器的等效刚度模型

三维悬线式力矩器是高密度光学头系统中的核心组件,其等效平动刚度和转动刚度直接决定着光学头克服和补偿系统误差的能力。该文根据三维悬线式力矩器的悬浮支撑模型,依据外力作用下悬线的变形协调关系,利用卡氏最小功原理建立了三维悬线式力矩器在各个有效运动方向上的等效刚度模型。进而由等效刚度可计算出三维悬线式力矩器的固有频率。最后利用Doppler激光测振仪对实验样品进行固有频率测试,实验结果与理论结果相比,最大误差不超过8.5%。该等效刚度模型对力矩器可动部的设计具有重要的理论指导作用。     

Improved partial response maximum likelihood method combining modulation code for signal waveform modulation multi-level disc

In this paper, we describe an improved adaptive partial response maximum likelihood （PRML） method combining modulation code tbr signal waveform modulation multi-level disc. This improved adaptive PRML method employs partial response equalizer and adaptive viterbi detector combining modulation code. Compared with the traditional adaptive PRML detector, the improved PRML detector additionally employs illogical sequence detector and corrector. Illogical sequence detector and corrector can aw）id the appearance of illogical sequences effectively, which do not follow the law of modulation code for signal waveform modulation multi-level disc, and obtain the correct sequences. We implement the improved PRML detector using a DSP and an FPGA chip. The experimental results show good performance. The higher efficient and lower complexity can be obtained by using the improved PRML method than by using the previous PRML method. Meanwhile, resource utilization of the improved PRML detector is not changed, but the bit error rate （BER） is reduced by more than 20%.     

谈谈飞机结构的抗疲劳细节设计

本文根据本人飞机结构设计中的具体经验,介绍了影响飞机结构细节的抗疲劳性主要影响因素,重点阐述了飞机结构细节的抗疲劳设计方法和具体实例,希望能给广大的飞机结构设计人员带来一些帮助。     

A Three—dimensional Network Topology in [Mn（N3）2（4,4‘—bipy）]n,Generat

Compound [Mn(N3)2(4, 4'-bipy)]n having three-dimensional structure was obtained with crystallographic data: C10H8N8Mn (Mr=295.16), tetragonal, space group P412121(#99), a=8.220(2), c=16.918(5)(), V=1143.1(5)()3, Z=4, Dc=1.715 g/cm-3, μ=11.07 cm-1, F(000)=596, R=0.042, Rw=0.051, for 590 observable reflections. The special topology structure in the compound occurs from the helical chain consisting of the -Mn-N-N-N-Mn'-unit. The value of χmT decreases with the decreasing of temperature     

可记录光盘染料旋涂工艺的流动机制研究

染料旋涂是可记录光盘复制中的核心工艺，依据实验给出旋涂工艺的简化模型，并运用旋转圆盘理论分析流体流动，考虑基片上的预刻槽对流动的影响，考虑基片表面和流体间的滑移效应，导出运动方程、边界方程和连续方程，最终导出染料旋涂的控制方程。     

一个非晶硅薄膜太阳能电池制备用激光刻线系统

 非晶硅薄膜太阳能电池制备过程中的激光刻线工艺要求刻线宽度在30 μm～50 μm之间,死区范围小于300 μm,刻线深度符合工艺要求。这不仅要求激光器具有较高的光束质量,而且要求光学系统具有较高的成像质量和较宽的焦深。设计了单激光器四分光路的激光刻线系统。采用设计的激光刻线装置,在1 400 mm×1 100 mm×3.2 mm玻璃基板上进行刻线试验,分别得到刻线P1,P2,P3的线宽为35 μm,50 μm和45 μm,死区范围（P1至P3的距离）为287 μm,最终深度分别为0.98 μm,0.24 μm和0.58 μm,刻线宽度和深度均符合薄膜太阳能电池制备工艺要求。     

Pit Depth and Width Modulation Multilevel Run-Length Limited Read-Only Optical Storage

When the techniques of integrating the variation of the conventional DVD,the high-density multilevel run-length pit depth and width simultaneously are adopted to limited read-only optical storage method is achieved. The dynamic range of readout signal is greatly enlarged in comparison with keeping one parameter varied, and the recording levels number can be obviously increased. The discs can be manufactured using standard photoresist mastering and replication techniques with great compatibility to conventional binary read-only discs. Experimental results show that eight-level read-only optical disc can be realized and the capacity can be increased to 20 GB.     

悬线式物镜力矩器动态特性的仿真实验研究

悬线式物镜力矩器是目前光学头系统中使用最为广泛的力矩器,其动态特性直接决定了光学头的读写性能。基于ANSYS参数化设计语言(APDL)建立了悬线式光学头物镜力矩器的仿真设计平台。通过仿真平台进行了力矩器一阶共振频率和峰值、二阶共振频率和峰值、扭转共振频率、静态灵敏度、动态灵敏度和相位等动态特性参数的仿真实验,仿真计算的结果与实际测量的结果相比,最大相对误差为4.2%。该仿真平台对于二维乃至三维悬线式物镜力矩器的设计和评价都具有重要的指导意义。     

浅析房建项目施工阶段的成本控制

企业经营的目的就在于获取最大的经营效益,如何减少投资并获取较大的利润是企业管理中的重要主题。目前,有很多的施工企业都进行了深度的项目开发,实施多元化的发展。但对于项目开发单位而言,房建项目工程成本涉及到多个方面,其中涉及到建设期的决策阶段、设计以及后来的施工阶段。文章站在开发单位对施工阶段的工程成本控制展开了论述。