查询词典 attenuation factor

One of the most important parameters that scale the degree of attenuation is Q-factor.

反演品质因子的方法有多种，常用的是谱模拟频谱比法。

On the point of structure optimization, focusing on the optimization to the quantity factor of silicon cantilever, three kind of power attenuation which effect the Q value and the measure taken to lower the power loss are analysed systematically, and finally a high Q value silicon cantilever resonator with an actual Q reaches 540 is developed.

在结构的优化方面，着重对硅梁谐振器的品质因数进行了优化设计，系统地分析了影响Q值的三种能量损耗形式，研究了为减小其能量损耗而采取的措施，最终设计出在检测条件下实际Q值达540的高Q值硅梁谐振器。

By the attenuation of the scattering factor, UV reaching the Earth′s surface is 23.89 W·m-2 which contributes about 62.55% of surface UV.

华北地区受水汽因子和散射因子影响损失于大气中的UV分别为19.30、35.31 W·m-2，这一能量损失表现出明显的季节变化和地区差异。

Based on basic theory of elastic wave propagation, wave equation forpropagation of elastic wave in 2 dimension vertical inhomogeneous mediumof similar concrete cutoff wall model is developed. 2 dimension elastic sheetof concrete cutoff wall is established to research law and energy distributionrelations between propagation, attenuation, reflection and transmission ofelastic wave in concrete cutoff wall; Based on the concept of resolution, thecontent of vertical reflection method used to inspect concrete cutoff wallresolution is raised and factors will have influences on resolution are analyzed,expression of defective layer composite reflection factor and detectabledefective layer maximum thickness are developed; Relations between allsteps of sampling system of vertical reflection are build, the influence ofcentrum characteristics and receiving sensor on testing results are analyzed,therefore parameter requirements for testing instrument and parameter selection principle of collected parameters are raised.

2从弹性波传播的基本理论研究出发，推导了弹性波在类似混凝土防渗墙模型的二维垂向不均匀介质中传播的波动方程式；建立了混凝土防渗墙二维弹性薄板模型，研究弹性波在混凝土防渗墙中的传播、衰减、反射、透射规律及能量分配关系；从分辨率的概念出发，提出了垂直反射法检测混凝土防渗墙分辨率的内涵，对影响分辨率的因素进行了分析，推导出了缺陷层复合反射系数、可检测缺陷层极限厚度的表达式；建立了垂直反射法采样系统各环节之间的关系，研究分析了震源特性、接收传感器对测试结果的影响，提出了对测试仪器参数的要求及采集参数的选择原则。

It shows that the presence of concentration gradient in the process of dissolving is the main factor influencing the underwater sound attenuation.

结果表明，梯度高分子溶液浓度梯度的形成是声衰减效果好坏的关键。

Using fluid dynamics FEM (two dimensional, three dimensional andaxisymmetric) and three dimensional acoustic FEM in meticulous analysis ofexpansion muffler structure, this paper studies the influences of each mufflercomponents' position, dimension, form and quantity on the fluid dynamic andacoustic performances;therefore the paper indicates that the end of the intruding tubeis the linchpin of the fluid dynamic performance of the whole muffler structure, thespringhead of muffler fluid dynamic performance is the smoothness of air current, themain factor which affects the acoustic attenuation value of expansion chamber muffleris the grade of saltation of the section of air conducting access, and the attenuationvalue of specific frequency can be dramatically enhanced by carefully designing thelength of expansion chamber.

本文通过流体力学有限元方法和三维声学有限元方法对扩张腔消声结构的参数化模型进行了细致的分析，研究了这种结构的各个组成部份的位置、大小、形状和数量对其流体力学与声学性能的影响，指出插入管端口是影响整个结构流体力学性能的关键，消声结构流体力学性能的根源是气流通过时的平稳程度；影响扩张腔消声量的主要因素为声波传播通路截面突变的程度，并可以通过精细的设计扩张腔轴向长度获得宽频或指定频率消声量的大幅度提高。

Experiments show that Ang Ⅱ activates JNK mediated by AT〓, and JNK increases transcription activity of c-Jun by phosphorylating c-Jun amido-terminal, and induces expression of c-Fos gene. c-Jun and c-Fos form transcriptional factor activated protein-1 complex. AP-1 may stimulates genes which correlate with cardiovascular remodeling expression, such as transforming growth factor, collagen type Ⅰ and Ⅲ, skeletal muscle α-actin,β-MHC, atrial natriuretic factor.

实验表明，在心肌和血管平滑肌细胞Ang Ⅱ通过AT〓介导激活JNK；JNK通过磷酸化c-Jun氨基末端增加c-Jun的转录活性并诱导c-Fos基因表达，c-Jun和c-Fos蛋白形成转录因子复合物激活蛋白-1(AP-1)，并刺激各种心血管重塑相关基因如转化生长因子-β1(TGF-β1)、Ⅰ，Ⅲ型胶原、骨骼肌α-actin、β-MHC(β-myosin heavy chain，β-肌球蛋白重链)、心钠素的表达。

The study that comprehensive and systematic analyze the factor of links length, thickness of links flange, distance of links rib, thickness of links rib and angle of brace to be changed affect energy-dissipation capacity of D shape and K shape eccentrically braced steel frames have been some studied before. This paper fills the black in the filed factor of high-span ratio, brace stiffness and brace-to-beam connections to be changed affectenergy-dissipation capacity of D shape and K shape eccentrically braced steel trames and any factor to be changed affect energy-dissipation capacity of Y shape eccentrically braced steel frames.

对耗能梁段的长度、耗能梁段腹板的厚度、耗能梁段翼缘的厚度、耗能梁段加劲肋的间距、耗能梁段加劲肋的厚度、支撑的夹角等因素的改变对D形、K形偏心支撑钢框架耗能的影响，前人已有一些研究，本文对这些因素的影响进行了全面系统的分析，完善了理论分析的不足；而结构高跨比、支撑刚度、支撑与梁的连接形式等因素对D形、K形偏心支撑钢框架破坏机理的研究以及各种因素对Y形偏心支撑钢框架破坏机理的影响，则很少有人涉及，本文对此也进行了深入系统的分析，填补了这一研究空白。

As viewed from the composite scores of each factor, after the Asian financial crisis, China's capital inflow has been forwardly driven by the before-mentioned three factors, which is mainly decided by China's internal factor. And meanwhile, China's reform of exchange rate system and the changes of external factor also generated forward push on China's capital inflows.

从因子综合得分来看，在亚洲金融危机之后，中国资本流入受到上述三因素的正向影响，这主要是由中国经济的内部因素所决定的，同时我国汇率制度改革及外部经济因素变化产生的正向冲击也对中国的资本流入起到了一定的推动作用。

In this paper, firstly, the embeddability of near-triangular graphs on the orientable surface is studied. By using Petersen's Theorem about 1-factor, we first prove that for a near-triangulation on the orientable surface, its geometry dual graph has a 1-factor; then after a procedure of operation leaded by the 1-factor, we show that if a graph G triangulates some orientable surface S_g, then G has a near-triangular embedding in S_h for h = g,g + 1,...,β(G/2」, where β is the Betti number of G. Hence we obtain a conclusion: A near-triangulation of the orientable surface is upper-embeddable. As a generalization, a class of near-quadrangulation is studied, and similar results are obtained.

本文首先研究了近三角剖分图的可定向曲面嵌入性质，通过运用Petersen关于1-因子的定理，首先证明了对于可定向曲面上的三角剖分图，其几何对偶图具有1-因子；然后在1-因子的导向下，通过做一系列增加亏格的手术，证明了如果一个图G三角剖分可定向曲面S_g，那么G可以近三角剖分可定向曲面S_h，这里h=g，g+1，…，「β(G／2」，β是指图G的Betti数，从而得出推论：可定向曲面上的三角剖分图是上可嵌入的，作为推广，又研究了一类近四角剖分图的可定向曲面嵌入性质，并得到类似的结论。

The receding calculations and experiment analyses in this subject are built on the blood cast of pig tongue.

本研究课题的前期工作是采用猪舌血管铸型模拟人舌而进行的数值计算与实验分析。

"Each human infection constitutes an opportunity for genetic modification of the virus through reassortment, mutation, or both...."

&每一次人类的感染都暗藏着一次基因修改的机会，无论是通过病毒的整合、突变或者兼而有之。。。。&