查询词典 metric coefficient

Then the influence of flow, pipe length, setting pressure of relief valve and stiffness coefficient of main valve spring on the water hammer peak pressure at the instant of fuel pistol closing was studied according to the detected pressure signals. Finally, the relatively accurate gas-liquid separation value and critical cavitation pressure value of the system was obtained by frequency analysis and wavelet analysis.

根据测得的压力信号，对燃料枪关闭瞬间流量、管长、溢流阀调定压力以及主阀弹簧刚度对水击效应引起的峰值压力的影响进行研究，并通过频率分析方法和小波分析方法较精确地获得系统的气液分离值和临界汽蚀压力点。

Then the influence of flow,pipe length,setting pressure of relief valve and stiffness coefficient of main valve spring on the water hammer peak pressure at the instant of fuel pistol closing was studied according to the detected pressure signals.

该测试平台不仅能实时可靠地对系统压力进行定量诊断与识别，同时还可以为燃料泵送系统的性能优化提供依据。

Compared to figleaf gourd, cucumber and sponge gourd showed higher net CO_2 assimilation, actual quantum yield of PSII electron transport Φ_(PSII, photochemical quenching coefficient, the efficiency of excitation capture by open PSII centers, rate of energy dissipation via light-independent thermal processes and fluorescence J_(f,D, energy flux via linear electron transport J_(PSII and electron flux for photosynthetic carbon reduction all the time during the measuring day.

黄瓜与丝瓜在净二氧化碳同化速率、光系统Ⅱ光化学量子效率Φ_(PSⅡ、光化学猝灭系数、开放的光系统Ⅱ中心激发能捕获效率、不依赖于光的热能与荧光耗散光能J_(f，D、PSⅡ总的光合电子流量J_(PSⅡ及用于光合碳还原的电子流量等参数上均表现出比黑籽南瓜更高的数值。

Spiral-grooved tube ; intensification of heat exchange ; numerical simulation ; ANSYS ; convective heat exchange coefficient

螺旋槽管；强化换热；数值模拟； ANSYS ；对流换热系数

Idlers use stamped bearing house. Using wide clearance bearing and multi-layer labyrinth seal improves service life, reduces rotation resistance and friction coefficient. Cast welding and keyless connection has been used for pulley, Hydraulic coupling and hard surface cone cylinder gear speed reducer for drive unit, angle type structure for head frame, so these improve starting performance, drive efficiency, load capacity and service life, reduce floor area and weight of equipment.

托辊采用了35°槽型前倾结构，辊子为冲压轴承座结构，大游隙轴承和册层迷宫密封，提高了寿命，降低了旋转阻力和摩擦系数，滚筒采用了铸焊结构和无健联接，驱动单元采用了液力耦合器和硬齿面圆锥圆柱齿轮减速机，头架采用角型结构，从而改善了启动性能，传动效率，承载能力和使用寿命，减少了占地面积和设备重量。

One new auto-optimized fuzzy control model of car-engines based on genetic arithmetic was introduced aiming at the problem that the parameters of car-engine are of the discreteness, the nonlinear and the uncertain characteristics, with which it is difficult to control accurately the excess air coefficient and the spark advance angle in dynamic procedure when using a conventional control model.

针对汽车发动机参数具有离散性、非线性和不确定性，采用传统控制模型难以精确控制瞬态过程的过量空气系数和点火时刻的问题，提出了一种基于遗传算法的发动机自寻优模糊控制模型。设计了实现该控制模型的嵌入式控制器，讨论了实时在线仿真基础上，采用遗传算法对模糊控制参数的自动寻优。

This paper presented the relationships between roof shapes and form coefficient under wind loads, drainage and corresponding loads caused by rain. The paper also discussed the relationship between roof shape and roof structural height and span and the relationship between roof shape and connection styles. These relationships will influence both safety and price of roof structure.

阐述了屋面形状与风载体型系数、屋面排水及相应雨水荷载的关系问题，讨论了屋面结构形式与屋面跨度和厚度的关系问题、屋面形状与钢结构节点形式的关系问题，这些问题对大型场馆钢结构屋面的安全性、经济性均有显著影响。

It is important to reduce the span of the hard roof to avoid its impact load on supports. However, at longwall top coal caving face, the periodical weight of roof is a main factor that crushes the top coal, which is beneficial to the top coal recovery. How to use the roof pressure safely is of crucial importance in top coal caving. Based on field monitoring, theoretical analysis of strata movement, the numerical model of compound structure of hard roof stepped cantilever and the top coal cantilever beam is built, and the parameters of the model are also determined. The elasto-plastic finite element method is used to analyze the effect of hard coal fracture under the abutment pressure of hard roof, and the cracking coefficient is defined according to the stress state of the element.

通过对岩层移动的现场观测，建立了&两硬&条件综放采场台阶悬臂—悬臂梁组合的煤岩组合结构力学模型，并以此煤岩结构为基础，建立&两硬&条件综放采场顶煤压裂的有限元数值模型，分析了坚硬顶板不同来压步距对坚硬顶煤的压裂效应，并确定了合理的支架阻力，从而对坚硬顶板进行有效的控制，消除坚硬项板对采场的冲击隐患，同时保证采场矿压对坚硬顶煤的有效压裂，达到提高顶煤回收率之目的，由此形成了坚硬顶煤、坚硬顶板条件下综放采场围岩控制的基本理论和方法。

Based on space-charge effect,I choose different diode model when diodes have different base doping concentration,analyzing the main factors impacting temperature coefficient of the diode,testing diodes with different angle lap,analysis of the blocked characteristics of diode in high temperature.

快恢复二极管的生产中发现大量的反向耐压呈现负温度系数的管芯，本文从空间电荷效应的角度，对基区掺杂浓度不同的管芯采用不同的二极管模型，分析管芯在高温情况下影响二极管反向耐压主要因素；并且对不同磨角的管芯进行测试，分析对二极管高温阻断特性的影响。

It will obtain the relationship between sound-absorbing coefficient and the effective parameters, and draw the relationship figures with MatLab.

用Matlab程序实现吸声系数、反射系数与各个参量变化关系的模拟，绘制关系曲线。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48