电气电子非金属材料质量认证探究

电气电子材料(塑料、印制电路板和印制电路板用基材)在电气电子产业链中处于关键环节,上游是石化合成树脂,下游为塑料加工和最终的电气电子产品,电气电子材料的各种性能(如:阻燃性能、热性能、电气性能、物理性能和老     

第三方认证材料数据库在电子电气产品认证中的应用

随着技术进步,电子电气产品使用到越来越多的非金属材料(包括塑料、橡胶和印制电路板等),如何对材料进行有效的质量控制,是制造商和认证机构共同面临的问题,建立材料认证和相应的第三方认证材料数据库系统是一个有效手段。     

覆铜箔层压板的粘合性能分析及其行业展望

印制电路板（Printed Circuit Board，简称PCB）是电子电气产品中不可缺少的重要部件，主要为电子元器件提供机械和电气连接。近年来，电子信息产业高速发展，印制电路板广泛地运用于信息、通讯、军事、航天和消费性电子等领域，出现了前所未有的高涨需求。覆铜箔层压板（Copper Clad Laminate，简称覆铜板或CCL）是印制电路制造行业的重要基础材料，主要由增强材料、树脂、铜箔和粘合剂构成，是由高分子合成树脂和增强材料组成绝缘层板，     

浅谈电子级玻璃纤维纱、布生产中的若干技术问题

电子级玻璃纤维纱、布（以下简称“电子纱与电子布”）是电绝缘玻璃纤维系列产品中的一支新秀，是覆铜板及印制电路板必不可少、不可替代的基础材料。     

官能化聚苯醚

本发明的目的是提供用于聚合物合金或电气或电子材料如印刷电路板或绝缘密封材料的官能化聚苯醚。     

我国电子布生产现状与CCL发展的新需求

电子级玻璃纤维布(简称"电子布")是生产覆铜箔板(CCL)必不可少的材料,也是生产印制电路板(PCB)的基础材料。电子布、CCL及PCB是电子电路产业链上3个紧密相连的上下游基础材料行业。这3个领域上下呼应、密不可分,其中CCL又在整条产业链上,发挥着承上启下的重要支撑作用。多年来,我国CCL与PCB工业的持续飞跃发展,其总产量已稳居全球第1位,加之我国早已是世界贸易组     

电子电路产业基础材料市场最新动态

电子玻纤布、覆铜板及印制电路板，是电子电路产业链上三个紧密相连、唇齿相依的上下游基础材料行业。     

青海高档电解铜箔产业化关键技术取得突破

从青海省科技厅获悉,青海电子材料产业发展有限公司承担的年产10000吨高档电解铜箔产业化关键技术研究项目近日通过验收,参加评审的专家一致认为,这项研究成果达到国内领先水平。电解铜箔是电子工业领域不可替代的关键性基础材料,主要应用于覆铜板、印制电路板以及锂离子电池制造等领域。作为     

欧盟关于处理电气和电子废弃物的政策

1.电气和电子废弃物处理的难题电气和电子废物是产生废弃物的一个巨大的来源,他们包括小型和大型家用电器、信息和电讯设备、照明设备及各种消费品,如收音机、电视机、摄像机及高保真音响系统等,这些设备的制造是选用多种不同材料组合而成,有一些甚至是危险品,这就是为什么讲对电气和电子废弃物如果不进行适当处理、采用特殊的如垃圾掩埋和焚化,就会对废弃物倾倒造成主要的环境污染问题。实事上,每一个电气和电子元件都是基于各种化合物组合装配而成的,例如:电路板/装配、电缆、导线护套、塑料阻燃剂、水银开关,显示设备如:阴极显示器和液晶…     

我国电子化学品的现状和发展前景

1 现状 电子化学品,一般是指为电子工业配套的专用化学品,主要包括集成电路和分立器件用化学品、印制电路板配套用化学品、表面组装用化学品和显示器件用化学品等。目前电子化学品的品种已达上万种,它具有质量要求高、用量少、对生产及使用环境洁净度要求高和产品更新换代快等特点。 我国历来十分重视电子化学品的研制、开发和生产,现在的产品已能部分满足我国信息产业的生产需求。现将2类比较重要的电子化学品的现状简要介绍如下:     

检定和校准证书的异同与应用

本文介绍了检定和校准以及证书的两点相同、五点不同之处,说明了对检定证书和校准证书的正确应用。     

Synthesis and luminescent properties of alkali-metal and ammonium fluorosulfatozirconates and fluorosulfatohafnates

We have synthesized a variety of alkali-metal and ammonium fluorosulfatometallates (titanates, zirconates, and hafnates). The alkali fluorosulfatozirconates and fluorosulfatohafnates have been shown to exhibit efficient roentgenoluminescence (RL) in the UV through visible spectral region, with a maximum at 390–440 nm. Their RL spectra depend significantly on their composition (cation, anion, and water content), coordination of KF and K₂SO₄, and relative amounts of fluorine and SO₄ groups. We have examined the effect of heat treatment on the RL of these compounds. The rubidium and cesium fluorosulfatozirconates Rb₃Zr₂F₉SO₄ · 2H₂O, Cs₂ZrF₂(SO₄)₂ · 2H₂O, Cs₈Zr₄F₂(SO₄)₁₁ · 16H₂O, and Cs₂ZrF₄SO₄ offer the most efficient RL.     

Heat and Mass Transfer and Modeling and Prediction of Environmental Catastrophes

Basic definitions and concepts of the physicomathematical theory of natural catastrophes are given. Possibilities of mathematical modeling of natural and technogenic catastrophes are discussed in the context of the theory of heat and mass transfer and the mechanics of reacting media. The importance of taking into account conjugate heat and mass exchange in modeling catastrophes is emphasized. A formula for evaluating the probability of a collisional catastrophe is given.     

凝固科学技术与材料

从凝固科学与实践发展的角度介绍了当前凝固材料体系的基本框架和凝固科学主要发展阶段的基本理论。作为材料科学与工程的基本组成，凝固科学技术正在现代科学理论的基础上针对传统材料的改性提高和新材料的发展需求，以控形、控构、控性为目标开展优质铸件的定向、晶体生长、快凝、深过冷及各种新型和超常领域凝固过程的研究，并介绍了其中某些方面和展望了可能的发展趋势。     

Multi-ferroic and magnetoelectric materials and interfaces

The existence of multiple ferroic orders in the same material and the coupling between them have been known for decades. However, these phenomena have mostly remained the theoretical domain owing to the fact that in single-phase materials such couplings are rare and weak. This situation has changed dramatically recently for at least two reasons: first, advances in materials fabrication have made it possible to manufacture these materials in structures of lower dimensionality, such as thin films or wires, or in compound structures such as laminates and epitaxial-layered heterostructures. In these designed materials, new degrees of freedom are accessible in which the coupling between ferroic orders can be greatly enhanced. Second, the miniaturization trend in conventional electronics is approaching the limits beyond which the reduction of the electronic element is becoming more and more difficult. One way to continue the current trends in computer power and storage increase, without further size reduction, is to use multi-functional materials that would enable new device capabilities. Here, we review the field of multi-ferroic (MF) and magnetoelectric (ME) materials, putting the emphasis on electronic effects at ME interfaces and MF tunnel junctions.     

CellML and associated tools and techniques

We have, in the last few years, witnessed the development and availability of an ever increasing number of computer models that describe complex biological structures and processes. The multi-scale and multi-physics nature of these models makes their development particularly challenging, not only from a biological or biophysical viewpoint but also from a mathematical and computational perspective. In addition, the issue of sharing and reusing such models has proved to be particularly problematic, with the published models often lacking information that is required to accurately reproduce the published results. The International Union of Physiological Sciences Physiome Project was launched in 1997 with the aim of tackling the aforementioned issues by providing a framework for the modelling of the human body. As part of this initiative, the specifications of the CellML mark-up language were released in 2001. Now, more than 7 years later, the time has come to assess the situation, in particular with regard to the tools and techniques that are now available to the modelling community. Thus, after introducing CellML, we review and discuss existing editors, validators, online repository, code generators and simulation environments, as well as the CellML Application Program Interface. We also address possible future directions including the need for additional mark-up languages.     

The shape and stability of wall-bound and wall-edge-bound drops and bubbles

The behavior of wall-bound drops and bubbles is fundamental to many natural and industrial processes. Key characteristics of such capillary systems include interface shape and stability for a variety of gravity levels and orientations. Significant solutions are in hand for axisymmetric pendent drops for a variety of uniform boundary conditions along the contact line with gravity acting normal to a planar wall. The special case of a wall-bound drop or bubble that is also pinned at an edge (i.e. a ‘wall-edge-bound’ drop) is considered here where numerical solutions are obtained for interface shape and stability as functions of drop volume, contact angle, fluid properties, and uniform gravity vector. For a semi-infinite zero-thickness planar wall (plate), a critical contact angle is identified below which wall-edge-bound drops are always stable. The critical contact angle is computed as a function of the gravity vector. The numerical procedure, which makes no account for contact angle hysteresis, predicts that such wall-edge-bound drops are unconditionally unstable for any gravity field with a component that is tangent to the wall while inwardly normal to the edge. Select experiments are conducted that support the conclusions drawn from the numerical results.