邻苯二甲酸二烯丙基酯树脂固化特性的研究

运用示差扫描量热(DSC)法研究了邻苯二甲酸二烯丙基酯(DAP)树脂的固化反应历程。讨论了引发剂对DAP固化特性的影响,并由DSC曲线得到了DAP树脂的固化工艺和动力学参数。通过固化度、FT-IR的测试对DAP树脂在中温条件下的固化情况进行了研究。结果表明:在过氧化二异丙苯(DCP)固化体系中引入BPO可以使DAP树脂在更低温度下引发固化;在BPO、DCP用量均为2%的条件下,确定了体系的凝胶温度、固化温度、后处理温度分别为:100.5℃,124.3℃,137.8℃,表观活化能为129.3 kJ/mol,反应级数为0.950。固化度、FTIR的测试结果表明:DAP树脂在中温条件下可以固化得较完全。     

液压施肥技术应用于大树复壮

2005年,针对区域绿化养护迫切需要改革的现状,由我局牵头组织调研;重点分析了土壤和植物的现状,选择了上海汉枫缓释肥料有限公司的缓释肥料技术及专有的液压注射施肥技术进行试点。经过2年的实践,证实了液压注射施肥技术对于大树复壮具有良好的效果,为行道树和绿地大型乔木的复壮和土壤改良提供了成熟的施肥新技术,提高了绿化养护作业的科技含量。     

太湖清淤底泥离心脱水处理技术的可行性研究

研究了卧螺离心机在太湖生态清淤工程应用中的脱水性能及可行性。分别对含水率97.5%和84.6%的生态清淤底泥进行脱水处理,实现了淤泥快速泥水分离。探讨了离心机转鼓转速、差转速,絮凝剂投加量、加药位置、液环层厚度、工作压力等工艺参数对淤泥脱水效果的影响。应用结果表明,离心脱水技术处理清淤底泥具有良好的实际效果和应用推广价值。     

电压比值差相位差对电能计量装置误差的影响

电压参数比值差、相位差是电能计量装置中引起电能计量误差的关键因素之一,通过电路分析和数学推导对电能计量相对误差εr与比值差f、相位差δ之间的关系进行分析.结果表明,f、δ是电压信号采集环节εr产生的直接原因;其中f与εr直接相关,δ通过tanφ与εr间接相关;f、δ、tanφ共同对εr数值产生影响.     

Modeling frequency-time synchronization systems that use signals of common sources

Article presents results of design and implementation of system model that uses signal of a common source to synchronize geographically distributed time and frequency standards (so-called general coverage algorithm). The use of various processing (mutual correlation and matched filtering) and estimation of time signal position methods as well as taking into consideration of multipath in channel are essential peculiarities of the model. The model may be used for estimating potential precision of a wide class of synchronization systems and the possibility of using various signals and processing techniques in such systems.     

HULL GESTURE AND RESISTANCE PREDICTION OF HIGH-SPEED VESSELS

Since trim and sinkage are significant while vessels are advancing forward with high speed, the predicted vessel resistance based on restrained model theory or experiment may not be real resistance of vessels during voyage. It is necessary to take the influence of hull gesture into account for oredicting the resistance of high-speed ship. In the present work the resistance problem of high speed ship is treated with the viscous flow theory, and the dynamic mesh technique is adopted to coincide with variation of hull gesture of high speed vessel on voyage. The simulation of the models of S60 ship and a trimaran moving in towing tank with high speed are conducted by using the above theory and technique. The corresponding numerical results are in good agreement with the experimental data. It indicates that the resistance prediction for high speed vessels should take hull gesture into consideration and the dynamic mesh method proposed here is effective in calculating the resistance of high speed vessels.     

关于纵火罪的新界定及意义

从火灾构成因素分析纵火罪,科学全面地界定纵火罪及相关罪名,对实际裁判和火灾勘查有重要意义。     

基于单片机的软起动器设计

从三相异步电动机的应用控制出发,介绍了基于单片机控制的电机软启动器原理,给出了基于单片机控制的电机软启动器设计方法。用此方法设计启动器具有控制结构简单、可靠性高、实用性强等优点。     

传输核心汇聚机房工艺布局规划研究

本文通过理论分析与实地测试,探究了当前传输核心汇聚机房普遍存在的局部温度过高问题,分析了造成该问题的主要原因,并提出了降低机房局部温度过高的工艺布局规划方法.