后平衡

Adoption of high-performance single chip, especially chips with DSP function and continuous enhancement of users technical requirement have made functions of signal analyzer more and more perfect. The development of single chips and analyzers at home and that of overseas compared, a kind of pocketable dual-channel and multi-function signal analyzer, based on DSP, are researched with the functions of dynamic analyzer, data logging acquisitor, start-up/ coast-down analyzer and dynamic balancer, etc.

高性能单片机尤其是DSP功能芯片的采用及用户技术要求的不断提高，使得信号分析仪的功能越来越完善，在比较了国内外单片机和信号分析仪的发展现状后，开发研制了一种基于浮点DSP芯片TMS320C32的便携式双通道多功能信号分析仪，兼有动态信号分析仪、巡检数采器、起停车分析仪、动平衡仪等多种仪器的功能。

Therefore liquid CO_2 avoids gas-solid multiphase flow, and supplies continuous low temperature gas for cryoprobe. Experimental results show that the 2-dimension temperature distribution for the first time, it includes:(1) The cooling velocity and freezing zone increases along the flux up at certain size of the cryoprobe in the same biological tissue.(2) As the diameter of cryoprobe increases, the temperature will descend faster, freezing zone will be broader obviously, and ice ball become larger. Until it arrives heat balance, the temperature keeps invariability.(3) Single freezing-thaw results in biggish mechanical injury already for loosen tissue such as pork liver; Successive freeze-thaw circle could quicken freezing and thaw velocity for compact tissue, and it has proved the more mechanical injury of successive freeze-thaw circle than the single freezing-thaw treatment.

文中首次对生物组织进行了二维温度场分布实验研究，得出：(1)当刀头大小一定，对同一组织冷冻时，流量越大，降温速度越快，降温影响区域越大；(2)随着冷刀直径的增加，降温速度随着增加；温度影响区域明显增大；冰球直径也随着增大，热量平衡后温度几乎不随时间变化；(3)对于结构疏松组织比如猪肺脏，单次冻融对组织已造成较大的机械破损；对于结构较致密组织，多次反复冻融可以使降温和复温速率增加，单次冻融的热应力造成的机械破损较小，多次冻融后造成的机械破损比单次冻融所造成的机械破损大；(4)直喷式刀头比导热式节能约15％。

The simulation results of the cylinder-block model were given in the article, consistent with that of Middlemen"s. It was shown that the block part could improve the uniformity of the flow distribution. The analysis of the flow field of some materials with different power-law factor in the die designed by Mckelvey was close to that of Mckelvey"s. It was shown that the flow distribution was uniform in the die that can producesheets with 1200mm in width. During the analysis the flow channel was divided into several parts to get the details about the fluid flow in each area. A conclusion was drawn after analyzing the influence of the die pressure on the flow distribution, that the higher pressure is good for the output and bad for the uniformity of the distribution. Simulation of the die applying the cylindrical main runner showed the fact that when the cylinder replaced the cone the change of uniformity was trivial. The uniformity of the non-block flow channel was so poor that the block in the proper position of the die channel was necessary. The project of the die for the wider sheet was put forth, and the analysis of the fluid flow in the die was shown.

本文模拟了圆柱管缝隙流模型的三维流动场，得到了与Middlemen结论一致的流动均匀性，并通过模拟直观地展示了采用阻尼块可以改善挤出均匀性的现象；分析了多种幂率指数的流体在Mckelvey等人设计的流道模型中的流动分布，得到了与Mckelvey的分析结果接近的压力降和流量偏差；本文建立了1200mm幅宽机头流道的三维有限元模型，并逐个分析各个区域和多个截面的流动分布状况，由此揭示了1200mm幅宽L-型机头流道内的流北京化工大学硕士学位论文动分布基本均匀，并在分析了机头压力对于挤出流动分布的影响后得出结论：较高的机头压力可以获得较大的产量，但是不利于物料均匀分布；模拟了采用圆柱管主流道时机头流道内的流动分布，得出结论：主流道由圆锥管改为圆柱管时对流动均匀性影响不大，通过设置适当的阻尼仍然可以达到挤出平衡；模拟了两端进料式圆柱管无阻尼流道的流动均匀性后得到结论：两端进料式无阻尼结构的流动均匀性较差，宽机头中仍然有必要设置阻尼块；确定宽幅机头流道的基本方案，并设计了一种宽幅防水卷材挤出机头流道的结构，通过流动模拟表明该种结构的流动均匀性较好；考察了宽幅机头对于不同厚度片材的挤出适应性，得到结论：当生产不同厚度的片材时，阻尼块高度需要调整。

One gram of Cu-saturated selective ion exchange resin was horizontally embedded in saturated soil pastes and recovered after various time ( 1、2、3、4 days) intervals, and the amounts of Cr adsorbed on the ion exchange resin were measured in order to determine the time needed for equilibrium.

将装有铜饱和树脂(DOWEX M4195)之树脂袋埋入已制备好之水饱和土壤中，分别於1、2、3及4天后取出树脂，振荡后测定树脂抽出土壤中有效性六价铬之含量，以确定抽出水田土壤中有效性六价铬所需平衡之时间。

A lot of experiments were finished to gain musks two components phase equilibrium data of many solvents,and these data were used to fit UNIFAC model's interaction parameter to endow UNIFAC model modified with better prediction function.

通过试验测定了合成硝基麝香二元体系的固液平衡数据，回归并修正了 UNIFAC 模型的相互作用参数，使 UNIFAC 模型具有更高的预测功能；为了评价修正后的 UNIFAC 模型对合成硝基麝香三元体系的预测功能，利用试验测定的溶解度数据和修正后的 UNIFAC 模型计算值进行了比较，结果表明相互作用参数的修正是理想的。

The thermal stabilities of dithioesters, trithiocarbonates and xanthates were also compared,indicating that trithiocarbonates and xanthates are more stabile than dithioesters,while the chain transfer abilities of the latter are usually better than that of the former.So how to balance the chain transfer ability and the thermal stability of RAFT agents is a big challenge.

另外我们比较了双硫酯、三硫酯和磺原酸酯的热稳定性，发现后两者的热稳定性要远远好于前者，但前者的链转移能力一般要大于后两者，所以如何平衡链转移剂的链转移能力和其热稳定性之间的矛盾仍然是个很大的挑战。

If these abnormities were laid according as frequency among 2-6 months,reflex abnormities are knee tendon reflex, palmar grasp reflex,...

其中 2— 6个月组，4个方面的异常项目按出现多少分别排列为：①反射异常：膝反射、手持握反射、巴氏征、非对称性颈肢反射、踝阵挛、坐位平衡反应、踏步反射、交叉伸展反射、紧张性迷路反射、躯干侧弯反射、拥抱反射；②姿势异常：仰卧翻成侧卧头后仰≥ 15°、立位悬垂、平卧颈后空隙≥1cm、俯卧悬垂、侧位悬垂、拉起、紧张性头偏斜、自发姿势异常；③肌张力异常：足背屈角、上肢围颈、手握拳、扶立足跟抬起≥ 3 0°、拇指交叉达掌心、窝角、内收角、跟耳角；④其他异常：头围≤ x -2s、斜视、主动运动减少/异常、听觉异常、视觉异常、眼颤、癫痫。

After successful starting, the control box will control the switch of the ATS to switch electric circuits of power supply.

从电网发生故障到备用机组向用电设备供电的时间为8-12S ，在市电恢复正常后，控制箱控制转换开关再次切换供电电路，恢复由电网供电，同时控制发动机空载运行发动机温度平衡并降低后，自动停机。

The new circumstances that the discrete manufacturing enterprise is confronted with are analyzed; the function and configuration of production system is expounded; the research actuality and contents about production system capacity in the discrete manufacturing enterprise are summarized; the main research contents in this paper are developed.2. The calculating and analytical methods about production system capacity are studied systemically, a model to calculate rough-cut capacity instantly in "excel" table style is designed, the means to analyze production capacity in different production mode are brought forth, and the balance tactics of production capacity versus load are put forward.3. The application characteristics used in production system about the methods of Computer simulation and CRP in the MRPII/ERP are analyzed and compared; the advantages of Computer simulation method are pointed out; and the simulation researches aiming at production system capacity are implemented by Ithink simulation software.4. A simulation model is founded under the analysis of production system capacity in the production system background of a firm; the change instances of yield, output rate and WIP in the production system are simulated by the action of procurement cycle, machining time, setup time and so on. 5. The change instances of production capacity in the assembly stage are simulated , and rational employees are obtained.

本文主要进行了以下几个方面的研究：1、分析离散型制造企业面临的新情况，阐明生产系统的功能和结构，对离散型制造企业生产系统生产能力的研究内容和现状进行分析，提出本课题的主要研究内容。2、在系统地研究生产系统生产能力的计算和分析方法后，设计了用Excel表快速计算粗能力的方法；给出不同生产方式下的产能分析方法，并提出产能与负荷平衡的策略。3、比较和分析了MRPII/ERP的能力需求计划方法与计算机仿真方法在生产系统中的应用特点，指出计算机仿真方法的优势，并用Ithink仿真软件对企业生产系统生产能力进行了仿真研究。4、以A公司的生产系统为背景，在对生产系统生产能力分析的基础上建立了仿真模型，模拟了在采购周期、加工时间、调整时间以及返工率、废品率、机械开工率等因素作用下生产系统的产量、产出率和在制品数量的变化情况。5、研究在装配阶段生产能力的变化情况，通过仿真优化后确定合理作业人员数量。

In order to analyze the relationship between radiation heat transfer and thermo-efficiency, the radiant heat flux of the cylinder and thermal balance are measured. The results show that: The reduction of thermal radiant flux in the cylinder is the primary cause of the improvement of thermal efficiency of the engine.

为了研究发动机热效率和辐射传热量变化之间的关系，利用辐射传感器测量了柴油机燃用DMC柴油混合燃料后缸内辐射传热量，进行了热平衡实验，分析结果表明，添加含氧燃料后，发动机缸内辐射传热量的减少是导致其有效热效率的提高的主要原因。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。