选择系数

基本解释 (translations)

selectance

与选择系数相关的网络例句 [注：此内容来源于网络，仅供参考]

This conclusion can also be proved by spectrum-warping audio watermarking algorithm in MCLT domain. To discuss further deeply on why spectrum-warping technique does not have the required robustness, the studies are carried out upon the essentials of bilinear transformation. All the theoretical analysis and experiments results put the robustness of the spectrum-warping audio watermarking under questioning.

四、提出了基于量化的变换域音频水印算法中关于量化参数的选择方法量化变换系数的音频水印算法是以修改谱分量幅值为基础，算法的主要问题是如何选择量化参数以确保算法的鲁棒性和不可感知性，另外量化系数的区域选择也会影响算法的性能。

The energy required to replicate even large amounts of nonfunctional DNA is in fact relatively insignificant on the cellular or organismal scale, so no selective pressure results selection coefficients less than one over the population size are effectively neutral

需要用来复制即使大量的非功能性DNA的能量事实上在细胞或生物体范围内相对地没有意义，因此没有选择的压力结果超过人口大小的选择系数小于一是有效中性的

The parameters are :① reservoir effective thickness;② reservoir porosity;③ reservoir volume efficiency;④ fair pay ′ s reservoir volume efficiency;⑤ distance to the fault;⑥ reciprocal of the square root of the distance to the fault ）;⑦ apparent fold strength coefficient;⑧ maximum principal curvature of structural plane;⑨ transversal section line curvature;and ⑩ longitudinal section line curvature.

摘 要 介绍了气井产能的确定方法及地质参数的选择与计算方法：采用初始二项式无阻流量、稳定产量及初始采气指数作为气井产能评价的指标；10项参数分别是①储层有效厚度；②储层孔隙度；③储容系数；④好储层的储容系数；⑤与断层的距离；⑥与断层距离开方的倒数；⑦视褶皱强度系数；⑧构造面最大主曲率；⑨横向剖面线曲率；⑩纵向剖面线曲率。

X-ray radiography, X-ray radioscopy and X-ray computed tomography were performed to the C preforms and C/SiC composites made by chemical vapor infiltration method. Elementary research of the simulation of X-ray nondestructive testing of C preforms and C/SiC composites was conducted. The main contents and conclusions are summarized as follows:(1) The equivalent absorption coefficients of graphite and SiC to Al (KAl/sic, KAI/C) were measured. It was found that in 35-45KV, KAl/sic=1.1~1.2 and KAl/c=0.08~0.12. That means X-ray radiography was much less sensitive to fiber defects than to SiC matrix. It was suggested that Al Image Quality Indicator would be used to evaluate the quality of X-ray radiographs of C/SiC.

本文选择X射线照相、X射线实时成像和X射线CT等三种方法对C纤维预制体及C／SiC复合材料进行了检测和研究，并对C／SiC复合材料X射线检测的计算机模拟做了初步的探索，主要研究内容和结果如下：(1)测定了C和SiC的X射线照相等效系数，在35～45KV的条件下，Al对SiC的等效系数K_为1.1～1.2，Al对C的等效系数K_为0.08～0.12，所以X照相射线检测C／SiC对C纤维缺陷不敏感，而对SiC基体缺陷敏感。

The traits selected were average daily gain after weaning and backfat thickness at 100 kg live weight. Breeding pigs were selected according to multiple-trait BLUP, and economic weight of BF was set as 2.5 times of that of ADG.

选择的性状为一般父系猪的选择性状，即断奶后生长速度和达100 kg体重时的活体背膘厚，利用多性状BLUP估计性状的育种值，选择指数中后一性状的经济加权系数是前一个的2.5倍，选择共进行了5个世代。

According to the absolute value of the coefficient in 3 the principal components,Marmot habitat selection'main factors were elevation、slope gradient、longitude(the absolute value of the coefficient respective were:0.860、0.740、0.712)and so on geography factor.Vegetation height and aboveground biomass have synergistic effect with geography factor.Distance from human disturbance and distance from road(the absolute value of the coefficient respective were:0.814 and 0.820) human activity factor were secondary factor.Vegetation coverage would named vegetation factor (the absolute value of the coefficient was:0.816) have very important influence to Marmota habitat selection.

根据三个主成分中载荷系数绝对值的大小可以判断影响旱獭生境选择的主要生态因子是海拔、坡度、纬度(载荷系数绝对值分别为：0.860、0.740、0.712)等地理因子，草高、地上生物量与地理因子又具有协同效应；距人为干扰距离、距公路距离(载荷系数绝对值分别为：0.814和0.820)人类活动因素是次要因子；盖度(载荷系数绝对值为：0.816)将其命名为植被因子，对旱獭的生境选择也具有重要的影响作用。

With the support of a major research grant of Zhejiang Province (No. 001101027) and the Plan of Promoting Education of Excellence of Zhejiang University in the 21st Century, this dissertation is devoted to address the above problems and fabricate an L-band EDFA with low cost, high performance and technological innovation.First the mechanism of an erbium doped fiber amplifier is introduced. Various theoretical models based on classical rate propagation equations are summarized and compared for their applications. We use a modified numerical model based on the Giles model, which agrees with the experimental results well. This serves as the theoretical base for the whole thesis and will be used to optimize the characteristics of EDFAs. A novel method based on a map of noise figure and gain is proposed to analyze efficiently the dependence of the noise figure and gain for EDFAs on the EDF length and the pump power. The characteristics of various EDFAs are studied and compared.Secondly, some important parameters are introduced to describe the characteristics of EDFAs. The methods and the experimental setups for measuring the gain and noise figure of an EDFA are emphasized. We introduce how to measure the characteristics of each component of an EDFA, especially the gain and absorption coefficient of an erbium doped fiber.Thirdly, four types of simple and novel L-band EDFA structures with low noise, high gain and low gain ripple are proposed to satisfy the requirement of a DWDM system. They can be classified into two categories. In the first category, a single ASE pumping is served asa secondary pump. This category includes the following three types. Type: a new construction using a fiber Bragg grating in an unpumped EDF section at the input side. Type: a new structure of L-Band EDFA with two-stage pumps, which utilizes the forward ASE as a second pump.

本论文本着科技创新、服务于生产实践的精神，以设计价格低廉，性能优越、结构合理简单的L-band EDFA为目标，依托浙江省科技厅重大科学基金资助项目(001101027)和浙江大学振兴教育计划资助的全光网络的搭建—《光通信技术》课程实验建设项目，展开了如下工作：首先，介绍了掺铒光纤放大器的工作原理，归纳总结了基于速率方程基础的EDFA的各种理论模型，分析比较了各个模型的特点和适用场合，最终选择完善的Giles理论模型作为本论文分析设计EDFA的理论基础；针对实际实验条件提出了修正的EDFA模型的数值计算方法；创新地提出了增益—噪声系数全局分析法，直观有效地分析了EDFA的增益和噪声系数与掺铒光纤长度和泵浦功率的依赖关系，并对各种EDFA的性能作了全面的比较；第二，介绍了掺铒光纤放大器特性参数的定义与测量方法，重点介绍了噪声系数和增益系数的测量方法及实验装置；介绍了组成掺铒光纤放大器各组件的特性测量方法，重点介绍了测量掺铒光纤参数的方法和实验装置；第三，针对WDM系统对L-band EDFA谱平坦、低噪声、高增益的要求，我们创新地提出了四种不同的L-band EDFA结构，按设计思路可以分为两大类：一类是基于单抽运二级泵浦法，这一类包括在未泵浦掺铒光纤的输入端插入一根布拉格光纤光栅的两段L-band的EDFA的新结构；基于前向ASE光作为二级泵浦源推动下一级EDF工作的泵浦分配、两段级联L-band的EDFA的新结构；基于单根光纤光栅、泵浦分配、两段级联的EDFA；另一类则是基于同时应用前后向C-band ASE作二级泵浦源的双抽运法，如基于前后向ASE光作为二级泵浦源的三段级联L-band的EDFA的新结构。

The utility function of the integrated model was divided into two stages, choice set and alternative choice. The specification of factor structure was used to capture the individual heterogeneity and marketing positioning of the alternatives in the second stage, and the effects of new modes on choice behavior and market structure were studied by hypothesizing coefficients' specifications in the joint estimation process.

整合性模式的效用函数区分为选择集合及方案选择两阶段，而於方案选择效用函数中以因素结构的指定方式，考量个体偏好的异质性与方案的市场定位，并藉由联合估计过程中的系数假设，分析新运具对於旅运选择行为及市场结构的影响。

In construction design, there is still no a reasonable uniform cost about the rigidity amplification coefficient of center beam and boundary beam.

在结构设计中，选择一个合理的中梁、边梁刚度放大系数和选择一个合理的梁端弯矩调幅系数一直没有得到一个统一的值。

The temperature gradient is larger in case ofussual half-zone model which has a uniform temperature distribution on the hot rod,andmodified half-zone model which has a non-uniform temperature distribution in the hotrod and negative radial temperature gradient near the axis of the hot rod.

模拟半浮区模型提出选择热传导系数与试验液体相当的材料作为热端棒材，使得热端内侧的轴向温度梯度接近于零。模拟半浮区模型的温度分布更接近于全浮区温度分布的一半。对于改型半浮区模型，选择热传导系数高于试验液体值一个数量级的材料作为热端棒材，使得热端温度分布不均匀，并且热端内侧温度高于外侧温度。

与选择系数相关的网络解释 [注：此内容来源于网络，仅供参考]

codon usage：密码子使用,密码子选择

codon type 密码子型 | codon usage 密码子使用,密码子选择 | coefficient of coincidence 并发系数

Coefficient of Variation Rule：离差系数法:选择具有最小离差系数决策的决策方法

Mean-Variance Analysis 均方差分析:同时应用均值和方差来做决... | Coefficient of Variation Rule 离差系数法:选择具有最小离差系数决策的决策方法. | Expected Utility Theory 预期效用理论:考虑管理者对待风险态...

distribution coefficient：分配系数

至於液相的选择则视样品的组成而定,大抵液相与混合物中之成分的化学结构应彼此相似,因液相的分离效果,系基於对成分的溶解力不同,即分配系数(distribution coefficient)不同而得,结构相似可以增加溶解力,以免冲提(elution)过快,分离不易.

form factor：形状系数

在PC卡中对无线模块的形状系数(form factor)都作了选择. 因此,只要带有同样形状系统的任何无线调制解调器都能使用. NS小组在今年春季德国召开的CEBIT贸易展上,成功地展示了使用DECT的WebPad. 开发小组也开发用户的形状系统,

modulus：系数

如果需要产生的数字不是非常的大,RandIntGenerator 在默认情况下会以10,000为系数(modulus)产生随机数,但是重载的构造函数允许你选择更小的值作为系数.

selective radiator：选择[性]辐射体

选择[性]辐射压[力] selective radiation pressure | 选择[性]辐射体 selective radiator | 选择[性]辐射系数 selective scattering coefficient

selectivity coefficient：选择系数

Ecalculated=Eleft-Eright当选择系数(selectivity coefficient)大於1时,则电极对干扰离子之反应性比分析离子之反应大0.1MX3PO4溶液之离子强度是0.6极谱法(polarography)可表现电流与电位间之关系半波电位(half-wave potential)当做定性工具,

selectivity coefficient：选择性系数

selectivity 选择性 | selectivity coefficient 选择性系数 | selector 选择器

self-absorption：自吸

selectivity coefficient 选择系数 | self-absorption 自吸 | self-actuated regulator 自力式调节阀

selective radiation pressure：选择[性]辐射压[力]

选择[性]辐射压[力] selective radiation pressure | 选择[性]辐射体 selective radiator | 选择[性]辐射系数 selective scattering coefficient