查询词典 section modulus

The modal tests of PCB and PCB assembly (free boundary condition and fixed boundary condition) were carried out. The equivalent elastic modulus and damping parameters of PCB can be gained, and the fixed boundary condition of finite element model was also determined. These will help to the following work.Second, drop impact tests of three different heights were carried out. Strains and acceleration responses of PCB were measured. Failed BGA packages of different test conditions were dyeing, and cross section analysis of failed solder joints was conducted.

针对JEDEC标准试件的局限性，提出了设计便于统计学研究焊点可靠性的试验试件的构想，利用有限元模态分析方法确定并验证了用圆形PCB组件替代JEDEC标准试件的可行性；通过一系列模态试验和有限元模态分析，确定了圆形PCB组件的相关试验参数，这不仅为跌落碰撞下PCB组件有限元模拟确定了较为合理准确的有限元模型，而且为正确地评价跌落碰撞下PCB组件的可靠性问题奠定了基础。2。

The modal tests of PCB and PCB assembly (free boundary condition and fixed boundary condition) were carried out. The equivalent elastic modulus and damping parameters of PCB can be gained, and the fixed boundary condition of finite element model was also determined. These will help to the following work. Second, drop impact tests of three different heights were carried out. Strains and acceleration responses of PCB were measured. Failed BGA packages of different test conditions were dyeing, and cross section analysis of failed solder joints was conducted. It was found in our drop tests that the root cause of lead-free solder joints under drop impact was the combined effect of mechanical shock and PCB bending vibration.

针对JEDEC标准试件的局限性，提出了设计便于统计学研究焊点可靠性的试验试件的构想，利用有限元模态分析方法确定并验证了用圆形PCB组件替代JEDEC标准试件的可行性；通过一系列模态试验和有限元模态分析，确定了圆形PCB组件的相关试验参数，这不仅为跌落碰撞下PCB组件有限元模拟确定了较为合理准确的有限元模型，而且为正确地评价跌落碰撞下PCB组件的可靠性问题奠定了基础。

Large numbers of test data which is systemic, credible, exact and detailed was acquired during the processing of these two scientific research item and settlement value and theoretical analysis on trial section was done together with the test and research on the site. The connection between the rule of settlement in the transition zone and the parameter such as groundsill, transmogrification modulus, material and density was studied based on comparing true settlement value in trial section with settlement value of theoretical calculation by frame analysis software. And it will help the farther research on design and construction about road-bridge transition zone.

同时在两个科研项目开展过程中，取得了大量系统、详实、可靠的试验数据，并结合现场试验研究工作，在室内开展了深入细致的过渡段沉降变形数值计算和理论分析研究，运用有限元分析软件，对过渡段的沉降变形进行了仿真数值模拟计算，与现场实测数据进行了对比分析，全面考察了过渡段地基土层与变形模量、路堤填料与压实密度等参数对过渡段沉降变形的影响规律，为进一步研究路桥过渡段的设计和施工可以提供借鉴。

The research contents include: slip distribution rules; slip effect on deflection in service stage; the impact of the interface friction, the paper fitting calculation formulae of cross section flexural Stiffness break subtract modulus, on the base of experimental study and ANSYS FE result, in addition to, present some significative advice for practical design.

本文在试验数据和有限元分析的基础上回归得出了组合梁截面抗弯刚度折减公式，并为实际设计提出了几点参考建议。

The paper focuses on the load distribution and load transfer among soil, pile-core and pile-socket, the interactive behavior of cement-soil ring and reinforced concrete core and some corresponding factors influencing the displacement of the pile which include the various core length, the section radius, the elastic modulus of soil and cement–soil etc.

着重分析了砼芯水泥土搅拌桩的竖向荷载在桩身内外芯和桩土各部分间的分配，砼内芯桩与水泥土外芯桩在荷载传递过程中的相互作用和共同工作特性，以及影响单桩沉降的因素包括砼内芯的直径和长度、水泥土和桩周土体的弹性模量等。

The results were as follows the airdried density ( moisture content of wood is 12%), the basic density and the ovendry density were 0.583 g·cm-3, 0.462 g·cm-3 and 0.507 g·cm-3 respectively, the airdried density was at the medium level in domestic wood species;the shrinkage coefficient of radial, tangential and volumetric were 0.099%, 0.183% and 0.296% respectively, the maximum swelling were 4.106%, 7.958% and 12.627% respectively;the ratio of tangential shrinkages to radial shrinkages was 1.5-1.9;the toughness was 52.12 kJ·m-2;the hardness of cross, radial and tangential section were 41.53 MPa, 31.41 MPa and 35.51 MPa respectively;the compressive strength parallel to grain was 44.50 MPa ;the modulus of elasticity in static bending and the bending strength were 12.63GPa and 127.31 MPa respectively;the shearing strength parallel to grain of radial and tangential were 8.76 MPa and 10.54 MPa respectively;the cleavage strength to grain of radial and tangential were 124.3 N·mm-1 and 138.6 N·mm-1 respectively.

结果表明大叶栎木材的气干密度（含水率为12％）、基本密度和全干密度分别为0.583 g·cm-3、0.462 g·cm-3和0.507 g·cm-3，气干密度属于国产木材的中等级水平；径向、弦向和体积干缩系数分别为0.099%、0.183%、0.296%，湿胀率依次为4.106%、7.958%和12.627%，差异干缩为1.5-1.9，其尺寸稳定性较好；冲击韧性为52.12 kJ·m-2，端面、径面和弦面硬度分别为41.53 MPa、31.41 MPa和35.51 MPa，顺纹抗压强度为44.50 MPa，抗弯弹性模量和抗弯强度分别为12.63 GPa和127.31 MPa，径面和弦面顺纹抗剪强度分别为8.76 MPa和10.54 MPa，抗劈强度依次为124.3 N·mm-1和138.6 N·mm-1。

The size of section, elasticity modulus, temperature, delay of construction and the length of cantilever are taken as import vectors, the neural network is developed with the graphic user＇s interface to realize the construction control for this kind of bridge.

以截面尺寸、弹性模量、温度、与零号块浇筑的时间差以及悬臂端的悬臂长度作为输入矢量，借助图形用户界面，构建了神经网络，实现了对大跨径PC连续刚构桥施工过程的预测控制。

The results show that, with the increase of the structure stiffness, the vertical displacement decreases. Owing to the small depth of a box-typed VLFS, compared with the expense caused by increasing structure stiffness, the decrease of vertical displacement is not valuable. It can be deduced that the flexibility of VLFS is caused by its principal dimensions . The increase of transverse section modulus does little good to the whole stiffness.

研究发现，随着浮体结构刚度的增加，结构的垂向位移值随之减小，但由于箱式超大型浮体结构的型深较小，与结构刚度增加所付出的代价相比，结构垂向位移减小的效果不明显，由此可知，超大型浮体结构的总体柔性是由于其巨大的主尺度造成的，横剖面剖面模数的增加对结构整体刚度的改善作用不明显。

Sparse conditions, the changes of the basal internode moment only depend on the number of stem materials to be achieved; in dense-planting conditions, the changes of the basal internode breaking moment are through the changes of section modulus and bending stress two factors together to be acheieved.

稀植条件下，基节折断弯矩的变化单靠构成茎秆材料的数量来实现；密植条件下，基节折断弯矩的变化是通过断面模数和弯曲应力两因素共同实现的。

A series of structural variables,including femoral neck cross-sectional area,cross-sectional moment of inertia, HAL,section modulus and FSI were assessed automatically with hip strength analysis DXA software.

其中90名女性受试者(年龄20～71岁，平均49.6岁)同时行定量超声跟骨强度测量，测量参数包括超声传播速度、宽频超声衰减值和跟骨强度指数。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷