3D Printing Conductive Composites with Poly(ionic liquid) as a Noncovalent Intermedia to Fabricate Carbon Circuits

In this study, a kind of imidazole type poly(ionic liquid) ([PEP-MIM]Cl) is synthesized, which can disperse carbon effectively. [PEP-MIM]Cl is used as an intermediate to coat carbon on the poly(acrylic acid)(PAA-co-MBA) via ion exchange to obtain conductive polymer composite (CPC). A series of characterizations are performed. Experiments show that carbon can be coated on the PAA-co-MBA uniformly, and compared with using carbon as filler, this method requires less carbon to achieve good conductive performance. The carbon layer on the polymer's surface is enriched via the swelling-shrinking properties of PAA-co-MBA according to the SEM images. Furthermore, in combination with 3D printing technology, PAA-co-MBA can be designed into different shapes to achieve various functions such as pressure-sensing element. Finally, a new type of CPC named carbon clad polymeric laminate (CCPL) is prepared by using the carbon coating method and 3D printing technology. It has the potential to replace copper clad laminate (CCL) and printed circuit board (PCB), to a certain extent. This technology expands the preparation method and application of the CPC such as flexible and wearable conductive fabrics.     

面向对象的液压与气压回路工作原理仿真软件开发

详细介绍了用于液压与气压传动课程教学的“面向对象的液压与气压回路工作原理仿真软件”的开发，该软件采用VB6．0、AutoCAD及Microsoft Visio在Win2000操作系统上开发而成，采用了面向对象的建模技术，实现了液压与气压原理图的自动识别及工作原理仿真。     

印制板化学镀镍

介绍了采用金属Zn粒子悬浮液活化要镀镍的印制板(PCB)Cu电路表面,使其可以进行化学镀镍的工艺方法,它可以克服Pd-Sn活化的缺点.     

LM339在数控电路中的应用

本文介绍了LM339在数控电路中的应用，并对其电路进行了分析。     

机械加工设备中满足人机安全的典型控制电路分析

介绍了机械加工设备中人机安全的等级标准，详细分析了满足不同安全等级标准的典型控制电路。     

我国电机保护现状与发展趋势

电动机的保护在企业生产中是非常重要的一项内容，其保护方式及过程有一定的规范要求，其发展趋势要遵循可靠、稳定的原则。     

X波段85W功率放大模块微带电路设计

针对X波段50 W GaN功放管电路进行改进设计,在满足原有指标的条件下,同时提高电路工作稳定性;巧妙改变微波电路结构,去除了原电路所用的电感,并在不影响电路指标的前提下适当减少了电容、电阻的用量,为整个电路的设计节约了成本。同时,仿真并制作了Wilkinson功分功合器。最终得到85 W功率放大模块,并给出了测试结果。     

通用循环水冷却器延时关闭控制联动电路设计

目前许多大型仪器的循环冷却水系统，都没有提供相应的自动化延时关闭装置，给工作带来不便。经过分析，将主机供电系统与循环冷却水供电系统进行关联，设计了联动电路，实现了正常关机，循环冷却水系统自动延时20min后关闭。既节约了工作时间，又提高了工作效率。     

The Effects of Phenyltrimethoxysilane Coupling Agents on the Properties of PTFE/Silica Composites

A study on PTFE reinforced with SiO₂ was described. This study included the manufactural process of SiO₂-reinforced PTFE and the effects of the content of silane (Z6124) on the properties of the composites material, such as thermal, dielectric properties, tensile strength and morphology, etc. PTFE/silica composites of 60 wt% SiO₂ loaded with a different coupling agent content were mixed by a high-speed dispersion machine and prepared by a two-roll milling machine. Our results show that the sample treated with 3 wt% silane has the highest tensile strength and optimum dielectric properties. Furthermore, the tensile strength and coefficient of thermal expansion (CTE) increase, and the water absorption decreases, with an increasing silane content. These experiments reveal that silane treatment can reduce the overall hydrophilicity of the composites. Finally, predictions on dielectric and CTE properties are discussed. It has been found that experimental values of the dielectric constant agree well with those predicted by the rule of mixture.     

推行清洁生产的战略意义及途径

介绍了清洁生产的内容,分析了推行清洁生产的意义,并对我国实施清洁生产的途径进行了讨论.