查询词典 temperature coefficient

Experimental accuracy and repetition of FBG temperature sensitivity and compensation were discussed.have selected several materials which has bigger coefficient of expansion to do packaging components, have made many temperature experiments, there have not flaws, such as aging, crackle, absciss layer, packaging materials have good temperature sensitivity and compatibility with optical fiber;have designed the simple and practical packaging components, have performed a serials of experiments about accuracy and repetition of FBG wave-length, have obtained the first step conclusion;have analyzed the result and made comparison between the result of different experiment, have summarized the best packaging effect and several rules to reduce mistskes.

本文所做的主要工作包括以下几个内容：一、选取了常见的热膨胀系数大的材料制作封装元件，经过多次一80℃到80℃反复测试，封装元件没有出现老化开裂、封装裂纹、空洞、离层等缺陷，封装材料具有良好的温敏稳定性及复用性，与光纤相容性较好；二、对光纤光栅进行简单、实用的封装处理，就封装效果的优劣性、波长测量的准确度、重复性和封装时产生的波长损失等方面进行了一系列的实验，得出了初步的结论；三、对温敏和温度补偿式封装的实验数据进行了详细的分析和对比，从数字上对温变过程中光纤光栅中心波长的改变及温变曲线进行了定量的分析，在大量实验数据分析结果的基础上，总结出哪种材料封装效果更好，以及如何有效的减小实验误差。

In the real bake-out process, it suggests that the air excess coefficient of burning should be controlled within 1 in order to avoid electrode being oxidized by high temperature fume; when the temperature is below 700 C, it rises slowly in temperature to bake out thoroughly and uniformly; when above 700 C, it speeds up in heating-up to reduce the electrode oxidation.

在实际焙烧过程中，为了减少高温烟气对电极的氧化，建议燃烧的空气过剩系数控制在1以下；700℃以前缓慢升温，以达到焙烧彻底、均匀的目的；在700℃以后，加快升温速度，以减少电极的氧化。

In the one half part, according to the strontium nature, thermodynamic calculation of correlative reaction and the principle of the vacuum aluminothermy reduction process, with the laboratory findings of preparation strontium by vacuum aluminothermy reduction compared and analyzed in different parameter conditions, a variety of factors which effect the decomposition rate of SrCO_3 and the percent reduction of strontia are gotten out. The factors include that the decomposition rate of SrCO_3 is influenced by different addition and pressure. They also include that the percent reduction of strontia is influenced by excess coefficient of reducing agent aluminium powder, the particle size of raw material or reducing agent, the pressure of barbecuing, temperature and reduction time. According to those, we can draw the conclusion as follows:(1) Decomposition temperature of SrCO_3 is decreased by adding carbon and alumina in different degree.(2) With quantitative carbon added under the vacuum condition, the decomposition temperature of SrCO_3 is decreased obviously, which can fall 150℃ compared with atmospheric pressure.(3) In keeping 1150℃ of 2.5h, under the 5Pa vacuum condition, the decomposition rate of SrCO_3 nearly keeps in 99% steadily.

在前半部分的真空铝热还原法中，根据锶的性质、相关反应的热力学计算及真空铝热还原法原理，通过对不同参数条件下的真空铝热还原法生产金属锶的实验结果的分析比较，得出了影响SrCO_3的分解率和氧化锶的还原率的种种因素，具体因素包括不同添加剂、不同气压对SrCO_3分解率的影响，还原剂铝粉的过量系数、原料与还原剂的粒度、制团压力、温度和还原时间等对氧化锶还原率的影响，得出具体结论如下：(1)添加碳和Al_2O_3能不同程度的降低SrCO_3的分解温度；(2)真空条件下加入一定量的碳可显著降低SrCO_3的分解温度，比之常压下可降低150℃之多；(3)在1150℃恒温2.5h、真空度达到5Pa的条件下，SrCO_3的分解率几乎保持稳定在99％；(4)氧化锶的还原率随还原剂过量系数的增大而增大，但是趋势越来越小，当过量系数超过25％后，氧化锶的还原率几乎不再增加；(5)氧化锶的还原率随原料与还原剂的粒度的变细而增加；(6)氧化锶的还原率随制团压力的增加而增加，但超过一定值后，氧化锶的还原率反而会下降；(7)氧化锶的还原率随还原温度的升高而增加；(8)氧化锶的还原率随还原时间延长而增加，在本实验条件下，超过2.5h趋于稳定。

And then the effects of compositions on the mechanical performance, characteristic temperatures, thermal expansion and chemical stability of the glass were discussed. Researches on lead borate sealing glasses show that PbO/B2O3 ratio exerts the most important effect on glass network. ZnO is beneficial to stabilize the glass against devitrification . Bi2O3 has little effects on the sealing temperature, while it helps to adjust the thermal expansion coefficient of lead borate glasses in a definitive range. When 0.5～4 mol% GeO2 is introduced, the glass possesses the highest stability and lowest sealing temperature (400 ?C), which is desirable for low-temperature sealing.

通过对含铅的硼酸盐封接玻璃研究得出，PbO/B2O3比是影响玻璃网络最主要的因素；添加ZnO有助于增强玻璃的稳定性，抑制析晶；Bi2O3对高铅系列配方玻璃的封接温度影响不大，但可使铅硼系列玻璃体系的热膨胀系数在一定范围内可调；在高铅系列配方中，引入0.5～4mol%的GeO2可有效地抑制玻璃析晶，降低封接温度；最终获得了两种性能较好的低熔点铅硼酸盐封接玻璃配方，G3封接温度低达400℃，其PbO含量为54mol%左右，BL10玻璃的封接温度为440℃，但其铅含量大大降低，仅为36mol%。

The interference of ambient temperature and external electromagnetism with Rogowskicoil were investigated by mathematical models. The relations between relative measurementerror resulting from temperature and heat distensibility coefficient of coil's framework andwindingcoilwerecarriedout. Theinfluenceofelectromagnetisminterferenceontheaccuracyof Rogowski coil, as well as the effect of temperature on integraph, were studied.

利用建立的Rogowski线圈的数学模型对温度和外界干扰磁场的影响进行了分析，得出了温度造成的相对误差与线圈骨架和绕组线圈热膨胀系数之间的关系；从两个方向上分析了干扰磁场对线圈精度的影响；分析了温度对积分器的影响等。

As the widely used resin matrix and composites, two kinds of epoxy matrix and its CF/epoxy composite and GF/composite have different mechanics property under different temperature. The result shows that the thermal property of the composite mainly depends on the matrix. If the matrix can resist high temperature, its composite can also have high strength under high temperature. resin matrix composite, thermal resistance, thermal deformation coefficient, severity retentivity ratio

多年来 ，人们一直致力于耐高温复合材料的研究工作，在耐高温树脂中能经受长期高温氧化的热固性树脂只有聚酰亚胺，本文主要研究三种树脂基复合材料在不同温度下的性能，即以聚酰亚胺为基体的复合材料以及两种环氧基复合材料在不同温度的性能。2 实验2 。1 材料选择研究中所用的增强材料选用英国考陶尔兹公司T30 0型碳纤维和进口UM - 40碳纤维以及南玻院S2高强玻璃纤维

The simulative model of temperature field and stress field in concrete , Heat and moisture coupling、Parallel simulative calculation of concrete with water pipe cooling、 Parallel feedback analysis of thermal characteristic parameters, and stress intensity factor of induced joint, which are the sixty-four-dollar questions, are studied in this dissertation. The main contents of this dissertation are as follows:(1)Based on the past and current research work, the calculation theory of the transient temperature field and creep stress field of mass concrete which self temperature influence is considered is deduced. The couple effect between the temperature field and humidity field of concrete, is considered on the basis of conservation law of water and energy, and the coupled formulation which coefficient is not constant of the heat and moisture in concrete is deduced. The calculation theory and model which is theoretically strict for solution to thermal problem in concrete with water-cooling pipes are recommended.

本文主要针对混凝土的温度场应力场仿真计算模型、热湿耦合、水管冷却问题的并行仿真、混凝土温度参数并行反演分析以及诱导缝应力强度因子计算等混凝土大坝温度应力数值仿真的关键技术进行了较为深入的研究，全文主要内容如下：(1)在现有研究基础上，推导了考虑自身温度影响的混凝土非稳定温度场和徐变应力场的计算理论；基于水分质量守恒和能量守恒原理考虑混凝土温度场和湿度场的耦合作用，推导了混凝土的变系数热湿耦合方程，并建立了相应的计算模型；引用严密的水管冷却混凝土温度场的计算理论和计算模型，比较了两种简化计算方法用于水管冷却混凝土仿真计算的不足。

It is well known that the large lattice mismatch (16%) and thermal expansion coefficient mismatch between GaN and sapphire substrate are the main origins of TDs. By new growing technique of LEO, we acquired high quality GaN films almost free of TDs. The stress characteristics in GaN films with MLTB growing technique is dependent on growing systems and conditions, and the changes of stress and dislocation density are rightabout; Combining buffer layers of high temperature and low temperature is first developed to growing GaN films with low dislocation density, and the mechanism of lowering TDs density is that the first buffer layer of high temperature can make nuclear in second buffer layer of low temperature bigger. This technique also can restrain yellow luminescence effectively.

众所周知，晶格失配和热应力失配是GaN异质外延中位错产生的主要原因；为此，我们对几种降低缺陷的MOCVD外延生长方法进行了新的尝试，其中尝试了侧向外延生长技术，得到了低位错密度（小于10〓/cm〓）、高质量的GaN外延层；尝试多低温缓冲层法，发现材料中的应力特性与生长系统和生长条件有关，材料中的应力与位错密度按相反方向变化；首次尝试高低温联合缓冲层法，材料中高温缓冲层可以使随后的低温缓冲层中成核颗粒增大，从而导致随后高温GaN外延膜中位错密度降低，并且能够有效地抑制黄光峰。

A process for manufacturing seamless flux-cored welding wires 0.8 to 4 mm in diameter with excellent cracking resistance and primer proof quality and containing very little diffusible hydrogen suited for the welding of high-tensile steels and steel structures subjected to large restraining forces by dehydrogenating by high-temperature heating comprises the steps of heating a straight wire 8-15 mm in diameter by direct electric heating through a first and a second pair of roll electrodes spaced 2 to 5 m apart and a ring transformer disposed therebetween to a temperature between 620 and 1100 degrees Centigrade, cooling the heated wire to a temperature not higher than 500 degrees Centigrade with a coefficient of heat transfer not higher than 250 kcal/m2 h degree Centigrade, and drawing to the desired diameter.

一种用来制造直径0.8至4mm的、具有优异的抗裂缝力和底层涂料防护质量并含有非常少的扩散氢的、适合于焊接高强度钢和承受大约束力的钢结构的无缝药芯焊丝，通过用高温加热进行脱氢处理来制造的工艺包括步骤：通过经布置成相隔2至5m的第一和第二对辊电极并经布置在它们之间的环心变压器的直接电加热，把直径8至15mm的直焊丝加热到620与1100℃之间的温度；用不高于250kcal／m2h℃的传热系数把已加热焊丝冷却到不高于500℃；以及拉伸到想要的直径。

The second one: we studied the effect of temperature on performance of LDs. It was found that threshold current increase exponentially, outpower and slope efficiency decrease parabola and exponentially respectively. Coefficient of temperature shift is 0.24/K, whereas characteristic temperature also decrease with rise of temperature.

研究了温度对激光器各参数的影响，随着温度的增加，阈值电流呈指数增加，输出功率和斜率效率分别呈抛物线和指数关系递减，同时特征温度也减少，波长随温度的漂移系数为0.24nm/°C，并且总结了一些温度和结构设计方面的关系。3。

Methods: Five patients with parkinsonism or dystonia were assigned to general anesthesia using an modified endotracheal tube.

本实验依照人体实验之相关规定进行，五位患有帕金森氏症或肌张力异常的病人接受神经立体定位手术。

If you can benefit from this book, it is our honour.

如果您能从本书获益，这将是我们的荣幸。