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area mass
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  面积质量
     When the armor plate is compared with the tightly arrayed corundum spheres, and penetrated by the same long-rod projectile, we find that the anti-penetration performance of corundum spheres is better than that of the armor plate when the unit area mass is uniform, the penetration depth of the unit energy for long-rod projectiles reduced by 8.73% for average.
     将装甲钢板与密排刚玉球层作比较,对同种弹形的长杆弹的侵彻,发现单位面积质量相等的刚玉球层抗侵彻性能要明显优于装甲钢板,平均减少长杆弹单位能量侵彻深度8.73%;
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     Results showed that the stretch recovery,the compression recovery and the unit area mass of fabrics had more influence on the vertical rising size of turn-over collar than the other properties.
     结果表明:面料拉伸回弹性、压缩回弹性及单位面积质量对直上尺寸的影响较大;
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     the larger the unit area mass,the larger the vertical rising size.
     单位面积质量越大,直上尺寸越大.
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  “area mass”译为未确定词的双语例句
     Currently there exist two problems in BPR area : mass expert experiences in BPR practices are difficult to be accumulated and reused.
     当前该领域存在两个问题:大量BPR实施应用中的专家经验难于积累和复用;
短句来源
     Currently there exist two problems in BPR area: mass expert experiences in BPR practices are difficult to be accumulated and reused.
     当前该领域存在两个问题:大量BPR实施应用中的专家经验难于积累和重用;
短句来源
     Examples show that the piston velocity and compressed-gas property depend strongly on the unit area mass of the piston,σ,and the initial pressure on both sides of the piston ,p0 and p1,but the effect of the sliding friction between the piston and compress tube on the piston motion is very small in the range of sliding friction coefficients from 0.4 to 1.2.
     和活塞两侧的初始压力p0和p1; 活塞与管壁之间的滑动摩擦力是次要因素,在滑动摩擦系数f=0.4~1.2范围内,摩擦力对活塞运动速度的影响很小.
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     The result showed that the linear correlation lay between particulates numerial concentration, total surface area, mass concentration and particle diameters, and the peak value of airborne particulate concentration lay between 1 and 2 μ m.
     测定结果表明:颗粒物的数量浓度、总表面积、质量浓度与颗粒物粒径在双对数坐标图上均呈直线关系,颗粒物浓度峰值在粒径1~2μm处。
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     (4) For Model MSIS 90, we found that the value of adjusted area mass ratio was 1.09 times that of it's theoretical one, we thought that at the altitude about 120km, the value of density given by MSIS 90 might be less than that of real density.
     4对于MSIS - 1 990模式 ,我们发现调整后的面质比要比理论的面质比大 1 .0 9倍 ,也许这是MSIS - 1 990模式在1 2 0公里附近密度偏小的缘故。
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     In the area, J.
     这方面,J.
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     Mass.
     Mass .
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     Survey of Mass Fitness in Urban Area
     汉中市周边地区小城镇居民体育健身情况的研究
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     Mass Screening of Phenylketonuria in Shenang Area
     沈阳地区20万例新生儿苯丙酮尿症的筛查
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     The Appendiceal Mass
     阑尾包块
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  area mass
Balance laws connected with "area" mass and momentum transportation for δ-shocks are derived.
      
New York area mass transit systems were also set to receive $17.5 million to improve security.
      


In this paper, a new method to compute the air-drag perturbation of artificial earth satellite is proposed, and the air density model is exponential. The main points are: (1) The orbital eccentricity e is replaced by parameter β, (2) The radicals appeared in the integrand are expanded in terms of Legendre polynomials: Where E is the orbital eccentric anomaly. (3) Based on the properties of legendre polynomial and the definition of Bessel function: The integral results can be written in the form of linear combination...

In this paper, a new method to compute the air-drag perturbation of artificial earth satellite is proposed, and the air density model is exponential. The main points are: (1) The orbital eccentricity e is replaced by parameter β, (2) The radicals appeared in the integrand are expanded in terms of Legendre polynomials: Where E is the orbital eccentric anomaly. (3) Based on the properties of legendre polynomial and the definition of Bessel function: The integral results can be written in the form of linear combination of I_m~*(v). (4) According to the demand that the relative error must be less than 1%, and order of magnitude analysis of terms appeared in the integral results, the simplified computational formulae of the secular term coefficient σ_(22) for semi-major axis a and eccentricity e are obtained as following: Where b is the product of the resistance coefficient C_D and the area-mass ratio s/m; ρ_0~* is the product of exp [-(a(1-e)-a_0(1-e_0)/H)]and ρ_0 which is the air density at the perigee r_0=a_0(l—e_0) of satellite initial orbit; H_1 is the scale height at the same point; and I*_m is the simplified form of I*_m(v). Those formulae are applicable to compute the orbit with any eccentricity. With those formulae, the computational results of satellites with any eccentricity shows: the relative errors for satellite with perigee heights of 160, 250, 400, and 1000 km are no more than 0.08%, 0.16%, 0.21% and 0.72% respectively. The method proposed in this paper can be not only easily extended to the more complicated exponential model of air densi ty, but also used to save storage and machine time as well. Therefore, it is significant both in theory and practice. The effect is obvious.

本文对大气密度的指数函数分析模型,提出了一种新的计算人造卫星大气阻力摄动的方法。它适用于任意偏心率的轨道。用本文简化公式计算,对近地点地面高度160,250,400,1000公里的任意偏心率的卫星,其相对误差分别不大于0.08%,0.16%,0.21%,0.72%。本方法,便于推广到较复杂的大气密度的指数函数分析模型。因此,不仅在理论上是有意义的,而且在实用上可以节省计算机的内存和计算时间,效果是显著的。

Design of a turbocharger compressor stage was formulated as a multiobjective nonlinear mathematical programming problem with the objectives of miniming aerodynamic losses and maximizing specific area (mass flow rate / flow path area of impeller inlet). Aerodynamic as well as mechanical constraints were considered in the problem formulation. A prediction method for performances of compressor stage was presented. Examples for maximum efficiency, maximum specific area, and weighted optimum...

Design of a turbocharger compressor stage was formulated as a multiobjective nonlinear mathematical programming problem with the objectives of miniming aerodynamic losses and maximizing specific area (mass flow rate / flow path area of impeller inlet). Aerodynamic as well as mechanical constraints were considered in the problem formulation. A prediction method for performances of compressor stage was presented. Examples for maximum efficiency, maximum specific area, and weighted optimum between efficiency and specific area were given and showed the presented optimization technique is valid and practical.

本文将离心增压压气机的设计问题表述为其空气动力学损失极小化,比面积(质量流率/动叶进口面积)最大化的多目标非线性数学规划问题.求优中考虑了多种气动与机械约束条件.文中介绍了压气机性能估算模型,给出了最大效率、最大比面积以及效率、比面积权衡最优条件下的算例.结果表明,本方法是有效且实用的.

A new method of calculating exactly Performance parameters of a heavy piston compressor has been investigated in this paper. From the theory of unsteady flow,the processes of the heavy piston motion and the variation of the compressed gas property have been obtained under various circumstances. The numerical method is a development from the operating principle of a heavy piston compressor and the utility program is very important to the design and calibration of a free-piston shock tunnel.Examples show that...

A new method of calculating exactly Performance parameters of a heavy piston compressor has been investigated in this paper. From the theory of unsteady flow,the processes of the heavy piston motion and the variation of the compressed gas property have been obtained under various circumstances. The numerical method is a development from the operating principle of a heavy piston compressor and the utility program is very important to the design and calibration of a free-piston shock tunnel.Examples show that the piston velocity and compressed-gas property depend strongly on the unit area mass of the piston,σ,and the initial pressure on both sides of the piston ,p0 and p1,but the effect of the sliding friction between the piston and compress tube on the piston motion is very small in the range of sliding friction coefficients from 0.4 to 1.2.

给出了一种精确计算重活塞压缩器性能参数的新方法,利用该方法可得到不同运行条件下自由重活塞运动的全过程和被压缩气体状态参数变化的全过程.该方法是对自由活塞激波风洞运行理论的发展,形成的计算软件可直接应用于自由活塞激波风洞的设计和状态调试.算例表明,活塞运动速度和被压缩气体特性主要依赖于活塞的单位面积质量。和活塞两侧的初始压力p0和p1;活塞与管壁之间的滑动摩擦力是次要因素,在滑动摩擦系数f=0.4~1.2范围内,摩擦力对活塞运动速度的影响很小.

 
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