Based on the analysis of in - situ monitoring data and the numerical simulation of the deformation of sheng - hong - qing tunnel along wujiu railway , it is testified that using back fill along riverside to prevent the creep is reasonable 摘要通过对武九客运专线盛洪卿隧道施工现场监测资料的研究，结合数值分析论证了该隧道河侧采取回填反压变更设计的科学性，并探讨了隧道施工监测的新方法。
With the development of doping technology , the formation of the base region in high - voltage transistor can be made by b diffusion technology , b - a1 paste - layer diffusion technology , close - tube ga - diffusion technology and open - tube gallium - diffusion technology 随着掺杂工艺的不断发展，高反压晶体管基区的形成经历了扩硼工艺、硼铝涂层扩散工艺、闭管扩镓工艺到开管扩镓工艺的发展。
This article introduces the silt geology platform afterwards uses the powder spurts and the plastics drain off water the board and grille and back pressure protects etc design and the construction control of measure , the construction has the guidance meaning to the construction of the bridge abutment soft base 摘要介绍了淤泥地质台后采用粉喷桩、塑料排水板、土工格栅、反压护道等措施的设计与施工控制，对台后软基处治工程的施工有指导意义。
Focusing on the performance evaluating and the design of tripropellant injector , adopting the cold test rig with background pressure supply , malvem particle analyzer , ccd photography system , tripropellant hot test - bed , numerical simulation software and auxiliary theoretical a nalysis , the d ischarge c haracteristic a s w ell a s a tomization p erformance o f the injector and the combustion performance as well as the mode - transition characteristic of thrust chamber are studied detailedly based on the 3 different structures of coaxial tripropellant injector , large numbers of important conclusions are gained 本文围绕三组元喷嘴的性能评定及设计方法。采用反压冷试台、马尔文测粒仪、 ccd高速摄影系统、三组元发动机热态试验台、数值仿真程序及辅助理论分析等多种技术手段和研究方法，对三种结构的同轴式三组元喷嘴深入进行了喷嘴流量特性和雾化特性、推力室燃烧性能和转工况性能研究，得到了大量重要结果。
In this paper , the authors introduced the engineering geology , design and time limit of the project of piled mountain , put forward some prevention and cure measures to improve the groundsill stability , including clearing silt , mounting stress platform , accelerating drainage , controlling piled velocity , and so on 通过对堆山造景工程的工程地质条件分析，结合工程设计、施工工期等条件，提出了清理淤泥、设置反压平台、排水、控制堆填速率等促进地基稳定的防治措施。
The company is specialized in the production of small diameter valve suitable for electrical station as well as sampling device and automatic feeding device for firepower electric plant , stop valve for high temperature and high pressure condition , throttle valve for high temperature and high pressure condition , counter - pressure high efficiency cooler , bi - screw reducer , fine adjustment valve together with pipe break , stop valve , diaphragm valve , plug - in speedy connector , ball valve and various special valves in addition to meter connector 公司主要专业生产小口径电站阀门及火力发电厂的炉内化学检测集中取样装置、炉内自动加药装置，高温高压截止阀，高温高压限流阀，反压式高效冷却器，双螺杆减压阀、微调阀等取样装置件和石油化工行业使用的管道闸阀，截止阀，隔膜阀，承插式快速接头，球阀及各种特殊阀门，仪表接头等。
At the initial stage of planar technique , b was employed as ideal diffusion impurity in base - region of npn si planar devices because of the match of its solid - solubility and diffusion coefficient in si with those of p in emission - region , and the good shield effect of sio2 film to b . but because of the relatively large solubility ( 5 1020 / cm3 at 1000 ) and the small diffusion coefficient , the linear slowly - changed distribution of acceptor b in pn junction can not be formed , which could not cater to the requirement of high - reversal - voltage devics . thereafter b - a1 paste - layer diffusion technology and close - tube ga - diffusion technology had been developed , while the former can lead to relatively large the base - region deviation and abruptly varied region in si , which caused severe decentralization of current amplification parameter , bad thermal stability and high tr ; the latter needed the relatively difficult pack technique , with poor repeatability , high rejection ratio , and poor diffusion quality and productio n efficiency 在平面工艺初期，由于b在硅中的固溶度、扩散系数与n型发射区的磷相匹配， sio _ 2对其又有良好的掩蔽作用，早被选为npn硅平面器件的理想基区扩散源，但b在硅中的固溶度大( 1000时达到5 10 ~ ( 20 ) ，扩散系数小， b在硅中的杂质分布不易形成pn结中杂质的线性缓变分布，导致器件不能满足高反压的要求，随之又出现了硼铝涂层扩散工艺和闭管扩镓工艺，前者会引起较大的基区偏差，杂质在硅内存在突变区域，导致放大系数分散严重，下降时间t _ f值较高，热稳定性差；后者需要难度较大的真空封管技术，工艺重复性差，报废率高，在扩散质量、生产效率诸方面均不能令人满意。
What banker applies at most is tall open quotation , amount of gather contest price is very large , but share price rushs on the powerful momentum for afterwards eve hard , turn around downward , to the limit of one ' s capacity drops broken all valence , although dish in your writing accepts the order , but share price goes cast apparent be enslaved to be enslaved to all of valence press instead , point of price of before one day of closing quotation also does not have a bit resistance , all the speed of price be issued to lower levels and share price keep basically consistent , because be banker concentration , shipment causes 庄家运用得最多的是高开盘，集合竞价量很大，但股价难以为继前日的强劲势头上冲，掉头向下，放量跌破均价，虽然盘中有大笔接单，但股价走抛明显受制于均价的反压，前一日收盘价处也没有丝毫反抗力，均价下行的速度与股价基本保持一致，因为是庄家集中出货造成的。
To ensure the charging pump working reliably , the following measures should be adopted : ( 1 ) adopting modified circular casing to reduce the radial force of the impeller and decrease the seal clearance ; ( 2 ) using radical ribs on impeller and helical sealing on shaft to realize minor pressure differential ; ( 3 ) using back pressure stuffing box to ensure sealing under small packing force ; ( 4 ) adopting self - lubricant flexible graphite stuffing for absorption of solids entering in the graphite in case of leaking 为确保灌注泵可靠工作，提出改进措施： ( 1 )采用改型环形泵体降低叶轮的径向力，减小轴封间隙，抑制泄漏； ( 2 )采用背叶片降低叶片根部压头，获得微压，使轴封两端承受较小压差； ( 3 )采用螺旋密封降低轴封两端压差，在保持微压的同时避免出现负压，密封效果更好； ( 4 )采用反压式填料密封结构，在很小的压紧力下，即可保证密封； ( 5 )采用具有润滑功效的柔性石墨填料，即使发生轴封泄漏，进入石墨内部的固相颗粒也将随着石墨的消耗而被钻井液吸收。
Under the result of the inverter ' s steady sate study , the limitation limited by two factors : the minimum time of opposing voltage and the ajustive range of power factor can be gained . a qualitative analysis method based on energy decomposing is applied to study the initialized energy 在讨论串并联逆变器稳态工况的基础上，从最小反压时间和功率因数调节范围两个限制条件，求出允许的稳态运行极限负载，启动电路在此极限负载下能可靠地启动就足够了，追求更高的启动能力没有实际意义。
