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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。

Hydrostatic transmission is widely used in construction machine. The research of one of its hard cores, low speed high torque radial piston motor, is very important. To directly estimate the life of this kind of motor, and to design a orbit curve with the longest life at same condition, this paper gives theoretic research of the equal contact stress inner curve of radial piston motor. The research is divided into four parts:1 Taken all forces the piston endured into consideration when radial piston motor working, the force between roller and orbit is deduced.

静压传动技术在各类工程机械中得到广泛的应用,对作为其核心部件的径向柱塞式低速大扭矩液压马达的研究显得十分重要,为了能直接对这种马达进行寿命估计,并能在相同工况下求得寿命最长的轨道曲线,本文从设计等接触应力内曲线的角度对这类马达作探讨性的研究,主要从以下四个方面进行:(1)综合考虑径向柱塞式液压马达工作时的各种主要受力状况,对柱塞组件进行受力分析,并通过仿真分析影响轨道和滚动体间正压力的各个因素,得到正压力的简化表达式。

In this thesis, I summarize the theoretical calculation method, applied scope and notice of siphonic drainage system, and point out the advantage of siphonic drainage system compared with gravitation drainage system. In the archetype experiment study of siphonic drainage tube, I adopt different tube diameter and different structural height to survey the drainage volume and press in different place. I observe various kinds of flow state, and get chief factors which influence hydraulic peculiarity of system as the tube diameter or structural height, and find out the relevance of factor to flux. I apply CFD Fluent software and adopt standard k-ε model and RNG k-ε model, then use finite volume method and second-order upwind scheme to discrete numerical model, while coupling numeration of velocity field and press is based on SIMPLE. In the numerical simulation of curved part of tube, siphonic drainage tube experiment system and multi-outlet siphonic drainage system, I make research on internal velocity and press of system in different project condition by changing the tube diameter of curved part, negative press value in tube export and improving the quantity of water gutter. This thesis first adopts a method of combining archetype experiment and numerical simulation to study the siphonic drainage system, test and verify the validity of experiment and numerical simulation, and makefurther study on system, it solves the problems of limited testing conditions, and has a logical results, it can provide a valid method for optimizing and designing the drainage tube-net system. The conclusion have referring value for study and design of siphonic drainage system.

本文首先对虹吸式排水系统理论计算方法、适用范围以及注意事项做出总结,并分析了虹吸式排水系统的优势;再对虹吸式排水管道进行原型试验研究,采用不同管径不同立管高度,对系统流量、管道压强进行量测,观察了各种工况下的流态,对其水力特性进行研究分析,找出影响水力特性的落差、管径主要因素以及与排水量的关系;进一步应用计算流体力学Fluent软件,采用标准κ-ε模型与RNGκ-ε模型,计算过程应用有限体积法和二阶迎风格式对数值模型进行离散,速度和压力的耦合采用SIMPLE算法,分别对系统弯管段、虹吸排水管道试验系统、多斗虹吸式排水系统进行数值模拟分析,通过改变管段弯头处半径、管段出口负压值、增加雨水斗数对不同工况下系统内部的速度和压力进行研究;本文首次采用结合原型试验与数值模拟相结合的方法,对虹吸式屋面雨水排水系统进行研究,试验与模拟相互验证,并进行拓展,很好地解决了虹吸式屋面雨水排水系统由于试验条件限制问题,结果正确合理,为排水管网系统设计和优化研究提供了有效的方法,对工程设计有较好的参考价值。

Through the theory analyse, we gave the concept of broad sense and the formula of drag force, then analysed main facts of drag force; based on existing experiment datas and theory results, the thesis discussed calculate method for hydrodynamic pressure and pulsating pressure which effect on soleplate, at the same time, based on special structure of local material dam overshot spillway and essentiality of safe flowing, we gave advice on fixing parameter.

通过理论分析,提出了广义拖曳力的概念并推导出拖曳力的计算公式,分析了影响拖曳力的主要因素;根据已有的试验资料及理论成果对作用于底板的动水压力和脉动压力的确定方法进行了探讨,并依据当地材料坝坝体溢洪道的结构特殊性和泄水安全的重要性,对有关参数的合理取值提出了建议。

In this paper, utilizing somatology theories, skin hygienic, non-linear theories and contemporary statistics methods, objective testing and researching on pressure comfortable for a style of brassiere are made, in order to develop a series of evaluation indices, evaluation apparatuses and experimental methods, which based on scientific evaluations wil...

本文对某固定款式常规女性胸衣进行了服装压的客观测试与评价,利用人体工程学理论、皮肤卫生学、非线性理论和现代数理统计方法,客观描述了女胸衣压力的大小和分布规律。其目的在于建立科学的客观评价指标,指导评价仪器的开发和实验方法的设计。从而使服装压力舒适性客观评价建立在科学的、系统的基础之上,为服装设计和生产提供量化的理论指导。

To obtain precise result, itis necessary, in the aspect of hardware, to set up one stable optics system with highSNR, only if so, can we do the measurement with the steady NIR. To do so, we designthe optics system using AOTF, and take some measures to increase the light energyand the system SNR, which includes the three layers structure of the light chamber,the equipments to cover the useless light, polarizing to reduce the influence of 0 gradelight and focalize the light with lens. Apart from the hardware aspect, according to theexperiments, we can see that the different temperatures between at setting up themodels and at predicting the results will affect the prediction results in a way, and theaffection extent will be increased along with the increase of the temperaturedifference. Moreover, the light energy that can be detected will be different with thecontact pressure, and the match of the refractive indexes between the tissue and thesurroundings will enhance the light transmission depth, which will take moreinformation of the tissue. So, during the measurement, we should ensure the sametemperature between measuring and predicting, the same contact pressure at everymeasurement and the match of the indexes between the tissue and the surroundings aspossible as we can.

要提高测量精度,从硬件方面就必须有一个稳定的、信噪比较高的分光光路系统,以此得到稳定的近红外光来进行无创检测,针对这个目的,我们设计了 AOTF 分光光路系统,并在系统中采用一定的措施如三层灯室结构、遮光筒以减小杂散光、起偏和检偏来减小 0 级光影响、透镜汇聚等等来提高出射光的能量和系统的信噪比;从其他影响因素方面,通过实验,我们得到不同的建模温度对于预测结果有一定的影响,且影响随着温度的差值越大而越大,另外散反射光谱的能量也随着接触压力的不同而不同,组织的折射率与环境匹配将加大光的入射深度,从而能携带更多的组织信息,所以在测量时我们尽可能保证同一温度、保证同一接触压力以及利用物理或者化学的方法使组织与环境折射率匹配等。

"Although everyday levels of stress are necessary to stimulate normal brain development, excess levels can be harmful," said Carrion, likening the biological effects of increasing amounts of stress to an inverted U. One common treatment for PTSD is to help a sufferer develop a narrative of the traumatic experience.

&虽然每天的各级压力的人要激发正常的大脑发育,过量水平,可以有害的,说:&腐肉,论及生物效应的越来越多的压力,以一个倒美国一个共同的治疗创伤后应激障碍是,以帮助患者制定一种叙述的惨痛经历。

Gradually the repertoire is augmented - twinges and spasms to the eyes, nose, lips, strange tics, pains in the head, ringing in the ears, obstructions in the throat, pressure on the bowel and bladder causing incontinence; tingling in the fingers, feet, pressures on the heart, on breathing, dizziness, eye problems leading to cataracts; running eyes, running nose; speeding up of heart beats and the raising of pressure in the heart and chest; breathing and chest complaints leading to bronchitis and deterioration of the lungs; agonizing migraines; being woken up at night, sometimes with terrifying jolts ; insomnia; intolerable levels of stress from the loss of one's privacy.

逐渐地,常备剧目增加了--眼睛、鼻子、嘴唇的刺痛和痉挛;奇怪的面部痉挛;头部的疼痛;耳鸣;咽喉部的梗阻;导致失禁的对于肠子和膀胱的压迫;手指、脚的麻刺感;对心脏和呼吸的压迫;眩晕;导致白内障的眼睛问题;流泪、流涕;心跳加速;心脏和胸部压力的升高;导致支气管炎和肺部恶化的呼吸和胸部不适;折磨人的偏头疼;在夜晚被唤醒,有时是以可怕的震动;失眠;因失去个人隐私而导致的难以承受的压力水平。

Through the comparative analysis of the earth pressure calculated by the different calculation methods, it is known that when the earth pressure behind the abutment of the integral abutment bridge under the action of rising temperatures is calculated, it is not proper to use the m method to calculate the resistance coefficients of the abutment back wall and column earth while the resistance coefficient of the abutment back wall earth can be calculated by the Broms method. It is proper that the resistance coefficients of the earth of the abutment and pier piles should be considered by the p-y curve.

通过对不同方法计算的台后土压力的对比分析,得知:在计算升温引起的整体式桥台桥梁台后土压力时,桥台背墙及台柱土的水平抗力系数计算采用m法是不适合的;桥台背墙后填土的水平抗力系数可采用Broms法计算;土对台桩及墩桩侧的水平抗力系数按p-y曲线来考虑是适合的。

From theoretical analyses and calculations, it has been confirmed that the local strains around Cr〓 in SrTiO〓: Cr〓 are about twice the bulk ones. It is found that the change of Dq〓 with pressure makes main contribution to PS of ground-state g factor of SrTiO〓: Cr〓. It is the admixtures of basic wave functions that cause the strain-induced splittings of t〓E and t〓A〓 levels of SrTiO〓: Cr〓. It is found that there are non-vanishing matrix elements of operators C , C and C between wave functions with positive M〓 and those with negative M〓 and the shortcomings in previous literature have been overcome.

通过微观理论分析与计算,证实了SrTiO〓:Cr〓中Cr〓周围的局域应变大约为整体应变的两倍;阐明了基态g因子随压力的变化主要来源于Dq〓的变化;发现波函数的混合对单轴压力导致的SrTiO〓:Cr〓t〓E和t〓A〓态的分裂是至关重要的;C、C和C算符在Ms为正的波函数与M〓为负的波函数之间的矩阵元不为零,纠正了过去文献对此的错误处理。

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推荐网络例句

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了,排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意,我建议我们在价格上大家各让一半。

After an hour and no pup, look for continued contractions and arching of the back with no pup as a sign of trouble.

一个小时后,并没有任何的PUP ,寻找继续收缩和拱的背面没有任何的PUP作为一个注册的麻烦。