卷绕式镀膜机的电气控制

卷绕式镀膜机的电气控制包括真空机组、蒸发、送铝丝及薄膜传动等四部分， 此外还增设了方阻法测厚装置。本文对上述的电气控制作了粗浅的介绍与分析．其重点 是电气控制的可靠性并力求电路简单，使用方便．可为用户维修该设备提供理论指导．     

航改型燃气轮机蜂窝封严真空钎焊技术研究

该文针对某航改型燃气轮机气封蜂窝组件磨损修复,总结蜂窝封严真空钎焊维修开发工艺实践经验,重点介绍了试修环形蜂窝封严结构件各工艺流程质量控制方法和钎焊蜂窝封严结构件关键技术难点,结合生产实际提出了操作技巧,为燃气轮机自主维修提供一定的技术支持。     

怎样选择常用真空泵油

介绍常用真空泵油的选择考虑和应用实例，供用户，有关厂商和维修人员参考。     

真空清洗原理及清洗剂

真空设备装配、使用及维修过程中,有一重要环节往往被人们所忽视,这就是真空清洗工艺。笔者在已往的论著中,已做过某些论述。在实践中可见,真空设备由于清洗不佳,致使真空度抽不上去的现象是屡见不鲜的.真空设备零件是经切削加工、冷热成形、焊接、粘接等工艺而制成的。在此过程中,零     

创新材料改进型周转箱在烟草加工行业真空回潮系统中的应用

本文介绍了烟草加工行业真空回潮系统烟叶加工过程中使用的创新材料改进型周转箱在制丝线真空回潮系统中的高效应用，通过采用创新尼龙网带＋带孔的四氟板的材料组合安装，创新材料改进型的烟叶加工周转箱，在高温高湿环境对烟叶进行加工使用的过程中，杜绝了内衬材料易烂、更换频繁的弊病。不但降低了生产成本，减少了维修费用，而且提高了在线加工质量，降低了生产线原料的消耗。取得了“一创多利”的显著实用效果，具有广泛推广应用的价值。     

透射电子显微镜高压电子枪的真空检漏

喷射氟里昂是真空检漏中一种简单而实用的方法。日本ＨＩＴＡＣＨＩ透射电子显微镜经维修后，其高压电子枪的真空度达到１．３３＊１０＾－３Ｐａ，灯丝的帮ｈ为ＨＩＴＡＣＨＩ公司所给指标的两倍。     

简析真空断路器工作原理与维修

真空断路器工作原理与其他断路器相比之是灭弧介质不同罢了,真空不存在导电介质,使电弧快速熄灭,因此该断路器的动静触头之间的间距很少。该断路器一般用于电压等级相对低的厂用电配置中!随着电力系统的迅猛发展,10KV真空断路器在我国已经大批量地生产和使用。对于检修人员来说,提高对真空断路器的认识,加强维护保养,使其安全运行,成了一个迫在眉睫的问题。本文以ZW27-12为例,简要说明真空断路器的原理与维修。     

GDQ—JQ63带充气气动及其应用

在真空抽气系统中,增压泵与维持泵之间常用电磁气阀来对维持泵进行停泵充气,但电磁充气阀工作可靠性低,生产和使用费用高,且容易被烧坏,本文介绍了一种带充气气动阀的结构原理及应用,它除具有电磁充气阀的功能外,还具有结构简单,制造成本低,维修简便,工作可靠性高等优点。     

合肥同步辐射光源直线加速器真空系统

国家同步辐射实验室的合肥光源为了适应科学研究的发展,自2009年开始进行重大维修改造项目。新的合肥光源注入器要求工作在800 MeV,为满足注入器的性能提升,直线加速器的真空系统进行了重新设计及安装调试,指标达到设计要求,目前运行状态良好,为合肥光源的满能量模式调试提供必要的技术支持。     

真空计量的需求与发展

综述了对真空计量的需求与发展,其中包括对全压力、分压力、气体微流量、真空泵抽速、空间真空测量和特殊条件下对真空测量的需求,还包括对真空计量标准和测试设备的需求.     

设计中白与空的物自性应用研究

目的探寻设计的"物自性",研究"白"和"空"在设计中物自性的应用表现。方法通过对"物自性"本身的探究,了解其与设计本质的关系;通过追寻"白"和"空"的产生,及其在设计中的应用,了解设计中的"白"和"空"在"物自性"上的表现。结论设计中的"白"与"空"是策画的减法,而禅中的"物自性"则是生活的减法。通过研究"物自性"及其与设计的关系,发现设计原本并不是为了要给世界增添什么新的额外的东西,它可能只是回归到了原始的状态,通过物体本身展现其本质的一面。清理多余的杂乱后出现的"白"与"空",不再是无意义,而是一种不存在的强烈存在,是一种全新意义上的创新性表现。     

“红色”视觉符号生产与建构研究

目的 对“红色”视觉符号生产与建构在文创产品设计中的内在逻辑和文化表征进行研究,探索具体的实践方法与路径。方法 以《新华日报》视觉衍生文创产品设计实践中所诞生的经典“红色”范式为研究对象,从“质料”“生产方式”等层面探索“红色”视觉符号的生产与建构,总结和归纳“红色”符号生产与建构的方法。结果 对经典“红色”形象进行分析得出,“红色”视觉符号构建需要依靠文字的效能、重复的力量,以及媒介的想象力,在“红色”视觉符号系统中展开视觉表意的实践,并且从生产的技术分析层面递进到观念层面,通过媒介赋能与融合创新实现“红色”文创产品的诞生。结论 “红色”视觉符号作为传承“红色”基因的媒介载体之一,具有形象的“光晕”,其视觉符号生产与建构需要遵循其自身的内在逻辑。“红色”视觉符号的生产与建构也是一种叙事化的建构,驱动“红色”文创产品视觉符号形象的诞生。     

Elevated temperature deformation behaviour of multi-phase Ni-20 at % Al-30 at % Fe and its constituent phases

The mechanical behaviour of the multi-phase ( + /) alloy Ni-20 at % Al-30 at % Fe and alloys similar to its constituent and / phases, Ni-30 at % Al-20 at % Fe and Ni-12 at % Al-40 at % Fe, respectively, were investigated. When tested in tension at 300 K, the alloys exhibited 20%, 2% and 28% elongation, respectively. At elevated test temperatures (700, 900 and 1100 K), the multi-phase alloy exhibited increased ductility, reaching an elongation in excess of 70% at 1100 K without necking or fracture. Similarly, the alloy demonstrated increased ductility with increasing test temperatures. In contrast, the / alloy showed greatly reduced ductility with increasing temperature and was quite brittle both at 900 and 1100 K. Thus, whilst at room temperature the / phase improved the ductility of the + / aggregate, at elevated temperatures the phase alleviated the brittleness of the / phase, thereby preventing any embrittlement of the multi-phase alloy over the temperature range 300–1100 K. Also, whilst the phase improved the room-temperature strength of the multi-phase alloy, at elevated temperatures where the phase is known to be weak, the / phase improved the strength of the multi-phase alloy up to 900 K, beyond which the strength deteriorated due to disordering and lack of anomalous strengthening in the / component.     

Phase relationship between β′- and O′-sialon at 1623 K

-sialon whiskers and co-products of synthesis, such as -sialon powders and O-sialon powders, were annealed at 1623 K for 8 h in a closed graphite reaction tube under 1 atm nitrogen. Phase stabilities, Si/Al ratios, and crystallographic features were investigated. The O-sialon phase, which formed in the early stage of synthesis when oxygen partial pressure was relatively high, became less stable in the present annealing condition and decomposed. The majority of released aluminium and possibly oxygen from the decomposed O-powder was incorporated into -sialon whiskers with little change in its lattice parameters, when the -sialon whiskers were included in annealing. The aluminium contents were always lower in the -whiskers than in the powders even after increasing its aluminium content during 8 h annealing. The lattice parameters of both -whiskers and powders increased with increasing aluminium content and became closer after annealing. The lattice parameters of -whiskers remained the same before and after annealing despite the increased aluminium content, while the lattice parameters of -powders decreased despite its aluminium content remaining unchanged. The lattice parameters of O-sialon increased with increasing aluminium content, and the increase in thea direction is the largest when compared with other parameters.     

Bone formation induced by calcium phosphate ceramics in soft tissue of dogs: a comparative study between porous α-TCP and β-TCP

Two kinds of tri-calcium phosphate ceramics (Ca/P = 1.50), -TCP and -TCP, which has the same macrostructure and microstructure, but different phase composition, were implanted in dorsal muscles of dogs. The samples were retrieved at 30, 45 and 150 days, respectively, after implantation, and were analyzed histologically. There were critically different tissue responses between -TCP ceramic and -TCP ceramic. Higher cell populations were observed inside the pores of -TCP than those of -TCP, bone tissue was found in -TCP at 45 and 150 days, but no bone formation could be detected in any -TCP implants in this study. On the other hand, the bone tissue in -TCP seemed to degenerate at 150 days. The results indicate that porous -TCP can induce bone formation in soft tissues of dogs; while the rapid dissolution of the ceramic and the higher local Ca²⁺, PO ₄ ^3- concentration due to the rapid dissolution of -TCP may resist bone formation in -TCP and the less rapid dissolution of -TCP may be detrimental to already formed bone in -TCP.     

Tilted and Crossing Vortex Chains in Layered Superconductors

No Heading In presence of the Josephson vortex lattice in layered superconductors, small c-axis magnetic field penetrates in the form of vortex chains. In general, structure of a single chain is determined by the ratio of the London [] and Josephson [_J] lengths, = /_J. The chain is composed of tilted vortices at large s (tilted chain) and at small s it consists of crossing array of Josephson vortices and pancake-vortex stacks (crossing chain). We study chain structures at the intermediate s and found two types of phase transitions. For 0.6 the ground state is given by the crossing chain in a wide range of pancake separations a [2–3]_J. However, due to attractive coupling between deformed pancake stacks, the equilibrium separation can not exceed some maximum value depending on the in-plane field and . The first phase transition takes place with decreasing pancake-stack separation a at a = [1 – 2]_J, and rather wide range of the ratio , 0.4 0.65. With decreasing a, the crossing chain goes through intermediate strongly-deformed configurations and smoothly transforms into the tilted chain via the second-order phase transition. Another phase transition occurs at very small densities of pancake vortices, a [20 – 30]_J, and only when exceeds a certain critical value 0.5. In this case small c-axis field penetrates in the form of kinks. However, at very small concentration of kinks, the kinked chains are replaced with strongly deformed crossing chains via the first-order phase transition. This transition is accompanied by a very large jump in the pancake density.PACS numbers: 74.25.Qt, 74.25.Op, 74.20.De     

基于CI战略的张大千文化品牌形象构建

分析了CI的历史、"大千"文化品牌CI的内涵和在"大千"品牌中导入CI的意义,并结合内江城市品牌形象发展的现状,论述了"大千"CI是"大千"品牌形象构建的战略选择。进一步分析了构成"大千"CI的三大要素:"大千"品牌理念识别、"大千"品牌行为识别、"大千"品牌视觉识别。从现实的角度提出了如何通过CI战略的理念、方法来建构"大千"文化品牌形象。     

论数字时代背景下互动展示的“微”趣味

以"趣味"美学思想为启示,结合数字时代的"微"影响,分析了互动展示中的"微"趣味,论述了"微"趣味在互动展示活动中所彰显的"微"特征,并从主题思维、形态、情感交流、个体互动4个角度进行论述。在此基础上,总结出"微"时代背景下互动展示设计的"微"效应。     

Thermal shock resistance of miniaturized multilayer ceramic capacitors

The thermal shock resistance of miniaturized multilayer ceramic capacitors (MLCs), of sizes 0402, 0603, 0805 and 1206, was investigated by comparing the leakage currents before and after thermal shock. It was generally found that smaller capacitors have a higher thermal shock resistance than larger ones. The 0402 MLC possesses a thermal shock resistance in excess of 420 C. The linear interdependence of thermal shock resistance and reciprocal of half thickness, as predicted by conventional thermal shock analysis, was not observed. Instead, the thermal shock resistance of an MLC was found to be inversely proportional to the total area of its ceramic surface. This confirms that pre-existing flaws on the ceramic surface dominate the crack initiation process and are therefore primarily responsible for determining the thermal shock resistance of an MLC.     

The effect of Ag additions on the microstructure of aluminium–lithium alloys

Minor quantities of Ag have been added to Al–Li–Cu–Mg–Zr alloys. Their microstructure has been studied by means of optical metallography, transmission electron microscopy and X-ray diffraction. In the high Li, low Cu:Mg ratio alloys the main phases found were , , S and T1, while fewer T2 and Al7Cu2Fe precipitates were also observed. The addition of up to 0.5 wt% Ag diminishes the and T1 precipitates size. This is attributed to a small increase of Li solubility in the matrix. In the low Li, high Cu:Mg ratio alloy the addition of 0.2 wt% Ag resulted in the precipitation of phase simultaneously with , , S and T1 phases. Due to the low Li concentration an unusual growth of the / precipitates at the expense of the precipitates was also observed. © 1998 Kluwer Academic Publishers