新型防火GF系列绝缘材料的研制及应用

绝缘材料质量的好坏是冶金电炉安全运行的重要因素之一,开发新型绝缘材料是当务之急。介绍了新型耐高温绝缘材料的生产工艺及绝缘性能,应用效果证明其具有推广价值。     

我国铁合金电炉绝缘现状及发展概况

介绍了铁合金电炉绝缘材料的特点、使用状况及新型绝缘材料的优势，简述了绝缘材料的耐热等级及今后的发展方向。     

敞口矿热炉电极把持筒的改造与新型绝缘材料的作用

收于旧式把持筒自身的结构缺陷，使铜瓦与把持筒绝缘处材质的工作环境恶劣，寿命很短，频繁热停炉更换绝缘件，选用新型绝缘材料，并采用新结构把持筒后，绝缘材料寿命提高１０倍以上，效果良好。     

敞口炉把持筒改造与新绝缘材料使用的实践

广西八一铁合金厂电炉中的电极把持器的结构存在一些缺陷，绝缘材料的耐高温性能较差，需要经常检修。通过对把持筒结构进行改造，并使用新型绝缘材料，减少了停炉时间，提高了设备作业率，取得了较好的经济效益。     

敞口矿热炉电极把持筒的改造与新型绝缘材料的使用

由于旧式把持简自身的结构缺陷．使钢瓦与把持筒绝缘处材质的工作环境恶劣，寿命很短，频繁热停炉更换绝缘件．选用新型绝缘材料，并采用新结构把持筒后，绝缘材料寿命提高10倍以上．效果良好．     

使用新型绝缘材料改进下线工艺提高热电厂3#发电机容量

本文简述了热电厂3#发电机大修中引用新型绝缘材料和进行工艺改进，以及实施改进措施后取得的效果。     

新型熔铸云母绝缘材料在矿热炉中的应用研究

介绍了一种新型合成熔铸云母材料，它具有电绝缘、耐高温、耐腐蚀、抗氧化、抗蠕变、有弹性、可切削加工等特点，克服了普通云母材料不耐高温、抗压强度低、易粉碎、易分剥和一次性使用的弊端，是矿热炉的理想绝缘材料，对矿热电炉的综合节能降耗很有意义，值得推广应用.     

抗电晕漆包线的研制及机理探讨

近年来国外交流电机变频调速技术正在迅速发展,在冶金、矿山、机电、石化、铁路、电梯、水泵、家电等诸多领域都需应用。因此交流高频电机绝缘结构和新型绝缘材料的研制成为各国的前沿研究课题。抗电晕漆包线可使交流高频电机的寿命提高数十倍以上,适用于交流高频电机使用的抗电晕漆包线将是很有发展前途的漆包线新品种。介绍了抗电晕线的研制,主要包括涂料、母材、涂覆工艺的研制,同时探讨了耐电晕机理。     

电机滑动轴承绝缘处理新工艺

近几年来，国外许多电机厂家和国内各大电机制造厂的滑动轴承的绝缘均采用聚四氟乙烯，但该绝缘材料不宜粘贴，为此我们对该绝缘材料进行了表面活化处理后用环氧树脂粘贴，满足了绝缘修理的要求。     

新型绝缘材料在冶金电炉上应用效益显著

绝缘材料是冶金电炉、有色电解设备中必不可少的关键材料，这类材料要求耐温度高、抗弧度强，阻燃性好、且有一定的抗热温性，并能长期经受高温、高辐射的考验，能在明火焰中可靠使用，但长期以来，我国冶金电炉、有色电解设备所用的绝缘材料大部分是虫胶云母制品。虫胶云母制品瞩Ｂ级绝缘材料，其耐热、耐湿、阻燃等项物理性能指标较低，耐温在１３０℃以下，当外界温度达到１０５℃时，虫胶开始软化，熔解。外界温度达１３０℃以上时逐步焦化，结构很快疏松、风化，进而导致表面碳化为导体引起打弧。而且这类材料耐热湿性能也很差，机械强…     

Integrated chip-based capillary electrophoresis

Integrated capillary electrophoresis (ICE) is emerging as a new analytical tool allowing fast, automated, miniaturized and multiplexed assays, thus meeting the needs of the pharmaceutical industry in drug development. The current state-of-the-art of ICE is described with an emphasis on the choice of the support material (glass or polymeric materials), electrokinetic fluid handling, and injection and detection issues. Strategies and chip designs for pre- or post-column derivatization, DNA sequencing, on-line PCR analysis, on-chip enzymatic sample digestion, fraction isolation, and immunoassays are presented. The review concludes with a brief outlook.     

Genetic control of isolating mechanisms in the genus Drosophila]

Published data on the genetic control of isolating mechanisms in the genus Drosophila are discussed. The main isolation types of genetic mechanisms (ecological isolation, behavioral isolation, hybrid sterility, and the inviability or impaired development of interspecific hybrids) are considered. It is shown that each of the isolation barriers between different species is controlled by a small number of genes. However, as each pair of sibling species is usually separated by several barriers, the total number of isolation genes is about 20 to 30. The probable sequence of events in the appearance of isolation barriers during the divergence of novel species is discussed. A concept of the consolidation of a new species is proposed. This concept is based on the assumption of the genetic determination of behavior that promotes crossing between individuals of the new genotype and constrains their crosses with individuals of the ancestral genotype.     

干式充填采矿法采场铺垫材料的选择

干式充填采矿法回采过程中,为了防止崩落矿石混入充填料中而造成金属损失,均需在落矿作业前铺垫一层隔离材料。介绍了干式充填采矿法采场铺垫材料种类,并对各种铺垫材料进行了特点和经济技术分析及经典综合评价。采场铺垫材料选择为采矿方法试验及应用打下了良好基础。     

进口变频电机大修国产化技术

以275kW日立产变频电机为例，阐述了在现有工装设备和工艺条件下的电机大修施工方案、国产绝缘材料和绝缘结构的替代方案以及部分工艺难点的解决办法。     

用炼钢废渣作铁水脱硫扒渣板涂层材料的实践

文章主要介绍了将精炼炉白渣中间含有的胶凝性材料作为和扒渣板相粘结的粘结剂,添加了一些中间包弃渣成分的抗渣性材料,作为扒渣板的隔离膜材料。以及主要实施过程及其产生的工艺效益。     

Foundation Isolation for Seismic Protection Using a Smooth Synthetic Liner

Smooth synthetic materials placed underneath foundations of structures can provide seismic protection by absorbing energy through sliding. Cyclic and shaking table tests were conducted on a variety of synthetic interfaces to identify a suitable liner for use as foundation isolation. It was concluded that a high strength, nonwoven geotextile placed over an ultrahigh molecular weight polyethylene, UHMWPE (geotextile/UHMWPE) constitutes a liner that is well suited for this application. The static friction coefficient of the interface (between the geotextile and the UHMWPE) is about 0.1. The dynamic coefficient is about 0.07 and is insensitive to changes in slip rate and normal stress. A single-story structural model with and without foundation isolation was tested using a shaker table. The results demonstrate the role of foundation isolation in substantially reducing the seismic shear forces in the model. Accompanying this reduction in shear forces are slip displacements along the isolation liner. Permanent slip (final location of the structure relative to its initial position) can be reduced through the use of a small restoring force that could be provided through passive soil resistance. Peak-to-peak slip (maximum slip during shaking) needs to be permitted for foundation isolation to be effective. The experimental and analytical research results demonstrate the technical feasibility of using a smooth synthetic liner in earthquake hazard mitigation.     

Some aspects of deformation behavior of coarse multiphase metallic materials

The deformation behavior of several single-and two-phase coarse microstructures has been examined using microhardness measurements. It has been found that the strength response of a coarse phase in isolation is distinctly different from its response when it exists in a two-phase system. The second phase alters the mechanical state of the first one andvice versa even in the plastically undeformed condition. This phenomenon is explained in terms of the existence of an appreciable amount of residual stresses in two-phase coarse microstructures. These stresses primarily arise due to the difference in thermal expansion coefficients of the phases. The influence of elastic stress field on microhardness response is shown with a new type of experiment to support the proposed explanation. The present results question the existing expressions for deformation modeling of multiphase materials because of the uncertainties in the estimation of the average strength of the phases in a two-phase system.     

Some aspects of deformation behavior

The deformation behavior of several single- and two-phase coarse microstructures has been examined using microhardness measurements. It has been found that the strength response of a coarse phase in isolation is distinctly different from its response when it exists in a two-phase system. The second phase alters the mechanical state of the first one andvice versa even in the plastically undeformed condition. This phenomenon is explained in terms of the existence of an appreciable amount of residual stresses in two-phase coarse microstructures. These stresses primarily arise due to the difference in thermal expansion coefficients of the phases. The in- fluence of elastic stress field on microhardness response is shown with a new type of experiment to support the proposed explanation. The present results question the existing expressions for deformation modeling of multiphase materials because of the uncertainties in the estimation of the average strength of the phases in a two-phase system.     

Isolation and partial structure determination of a clonidine-displacing substance from bovine lung and brain

A large scale extraction and isolation method was developed for the purification of clonidine-displacing substance (CDS) activity from bovine lung or brain. This optimised method used direct freeze drying of tissue, hexane removal of lipids, and methanol extraction of CDS activity. Using a bioassay directed isolation strategy a new CDS compound was purified from an extract of bovine lung. The isolation strategy involved subsequent steps of flash C-18 chromatography, ion exchange, size exclusion, and C-18 HPLC. An HPLC detection method was developed and applied to show that the new CDS is present in both lung and brain tissue. Spectroscopic data for this new CDS indicates that it is related to guanosine, but is not noradrenaline, adrenaline, histamine, agmatine, guanosine, GMP, GDP or GTP.     

Some aspects of deformation behavior of Coarse Multiphase Metallic Materials

The deformation behavior of several single- and two-phase coarse microstructures has been examined using microhardness measurements. It has been found that the strength response of a coarse phase in isolation is distinctly different from its response when it exists in a two-phase system. The second phase alters the mechanical state of the first one andvice versa even in the plastically undeformed condition. This phenomenon is explained in terms of the existence of an appreciable amount of residual stresses in two-phase coarse microstructures. These stresses primarily arise due to the difference in thermal expansion coefficients of the phases. The in- fluence of elastic stress field on microhardness response is shown with a new type of experiment to support the proposed explanation. The present results question the existing expressions for deformation modeling of multiphase materials because of the uncertainties in the estimation of the average strength of the phases in a two-phase system.