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双k
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  double-k
     Discussion on the initial fracture toughness K_(IC)~(ini) in the double-K criterion
     双K准则中起裂韧度K_(IC)~(ini)的讨论
短句来源
     Besides, the double-K fracture parameters for self-compacting concrete with four different strengths of M20, M60, M100, MHO, is determined.
     本文还研究了M20,M60,M100,M140四个强度等级自密实混凝土的双K断裂参数。
短句来源
     Study on Double-K Fracture Parameters of Self-Compacting Super-Strength Concrete
     自密实超高强混凝土双K断裂参数研究
短句来源
     Through the double-K fracture criterion and fracture model of three point bending beam,the effect of crack cohesive force on the fracture process is analyzed.
     通过双K断裂判据,以带切口的三点弯曲梁为断裂力学模型,分析了裂纹黏聚阻力对断裂过程的影响规律,计算该弯曲梁结构断裂试样的最大承担载荷;
短句来源
     1. Study on the TPFM and double-K in theory and determining parameters and experiment method.
     1.对混凝土双参数模型和双K断裂准则在理论上、参数确定方法上、试验方法上进行了比较研究。
短句来源
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  double k
     Double k Type Ridge Estimation and Its Applications in GPS Rapid Positioning
     双k型岭估计及其在GPS快速定位中的应用
短句来源
     Influence of specimen initial crack length on double K fracture parameter of concrete
     试件初始缝长对混凝土双K断裂参数的影响
短句来源
     Using three point bending beams of concrete and the maximum load P max and the corresponding crack mouth opening displacement CMOD c measured in experiments, the precritical crack propagation length Δa c , initiation fracture toughness K ini IC , unstable fracture toughness K un IC (double K fracture parameter) and the critical crack tip opening displacement CTOD c were analytically determined based on the fictitious crack model.
     本文采用三点弯曲梁试件利用在试验中测得的最大荷载 Pm ax及对应的裂缝口张开位移CMODc等参数 ,根据虚拟裂缝模型求得了砼裂缝亚临界扩展量 Δac、起裂断裂韧度 KiniIC、失稳断裂韧度 KunIC(即双 K断裂参数 )及临界裂缝尖端张开位移 CTODc。
短句来源
     This paper reviews the experimental base for double K criterion of concrete firstly, then according to the configuration, size, thickness, and initial notch of specimens, it analyzes the relationship between initial fracture toughness and unstable fracture toughness, as well as initial fracture load and peak load.
     本文首先简要地介绍了混凝土双 K断裂准则。 通过对不同试件形式、不同试件尺寸、不同厚度、不同体积、不同初始裂缝长度下起裂荷载、起裂韧度与最大荷载、断裂韧度关系的统计分析发现 :起裂韧度与断裂韧度并不是两个独立的材料参数。
短句来源
     fracture parameters. Part 3, through two kinds of rock material specimens, both of them for three points bending and compact tension experiments, with the result of cohesive force and double K fracture parameters mode, it is studied that the variation law of fracture parameters with specimen size and loading manners.
     (3) 通过两种岩石材料的三点弯曲和紧凑拉伸断裂试件的实验,结合粘聚力分析的结果和双K断裂的模型,研究了岩石的断裂参数随试件尺寸和加载方式的变化,探讨了岩石断裂的尺寸效应。
短句来源
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  “双k”译为未确定词的双语例句
     G~1 Continuous Conditions for a kind of k×k-degree B-sp line Surfaces
     一类双k次B样条曲面的G~1连续性条件
短句来源
     4. By using the wedging splitting specimens of which dimensions are 200 X 200 X 200 (SX hXf) with ratio of the initial crack length a0 against h are 0.2, 0.3 , 0.4, 0.5, 0.6 test, to study the difference in the methods of calculating the effective crack length ac.
     4.采用尺寸为200×200×200(S×h×t),缝高比分别为0.2,0.3,0.4,0.5,0.6的楔入劈拉试件,比较研究了双参数模型与双K断裂准确定等效裂缝扩展长度α_c方法的不同。
短句来源
     3.By using the three-point bending beam of which dimensions are 800X200X200 (SX h X f) with ratio of the initial crack length ao against h are 0.2,0.3 , 0.4, 0.5, 0.6 test, to study the difference in the methods of calculating the effective crack length ac.
     3.采用尺寸为800×200×200(S×h×t),缝高比分别为0.2,0.3,0.4,0.5,0.6的标准三点弯曲梁试件,比较研究了双参数模型与双K断裂准确定等效裂缝扩展长度α_c方法的不同。
短句来源
     Application of thin bed resistivity logging in SK313 well
     薄层电阻率测井在双K313井的应用
短句来源
     CALCULATION OF BEARING CAPACITY OF TWIN-K SPACE PIPE JOINTS OF A PROJECT
     某工程双K型空间管节点承载力计算
短句来源
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  double-k
Experimental measurement of double-K fracture parameters of concrete with small-size aggregates
      
The double-K fracture model can well describe the development of cracks undergoing during the entire fracture process in concrete.
      
Determination of double-Determination of double-K criterion for crack propagation in quasi-brittle fracture Part I: experimental
      
In order to predict the crack propagation during the fracture process in quasi-brittle materials a double-K criterion is proposed.
      
The double-K criterion consists of two size-independent parameters.
      
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  double k
Double K-shell ionization of atoms by a single photon
      
We investigate the double K-shell ionization of heliumlike ions by a single photon.
      
Another proof for the bulk interaction at high vertical velocity is the first observation of the two electron - one photon double Kα (or Kαα) emission with low energy MCIs.
      
Single and double K-vacancy fractions at sulphur ions inside Gd are measured for ion velocities between 7v0 and 14v0 (v0=c/137) using the probe layer technique.
      
Single and double K-vacancy fractions at sulphur ions in Fe and Ni are measured for ion velocities between 7v0 and 14v0 (v0=c/137) using the probe layer technique.
      
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It is shown that the 40Ca20 is unstable against the process 40Ca20 + 2e- →40Ar18hh=2vc, its half lifetime is about 1.2×1033 yr.

本文计算表明通常认为高稳定的双满壳层核~(40)Ca_(20)其实并不稳定。~(40)Ca_(20)将可能通过双K层电子俘获的机制而转化为~(40)Ar_(18),其半衰期约为1.2×10~33年。

On the basis of tests by use of laser speckle photography,photoelastic coat-ing and strain gauge technique and large size compact tension specimens. Itwas found that a K_R-resistance curve can be taken as a fracture criterion inthe analysis of crack propagation in concrete structures. As a result, a doub-le-K fracture criterion equivalent to the K-resistance curve, but moresimpler and practical is proposed in this paper. K_(IC)~S is taken as a fractureparameter to describe the beginning of the main crack in...

On the basis of tests by use of laser speckle photography,photoelastic coat-ing and strain gauge technique and large size compact tension specimens. Itwas found that a K_R-resistance curve can be taken as a fracture criterion inthe analysis of crack propagation in concrete structures. As a result, a doub-le-K fracture criterion equivalent to the K-resistance curve, but moresimpler and practical is proposed in this paper. K_(IC)~S is taken as a fractureparameter to describe the beginning of the main crack in the concrete struc-ture and K_(rc)~r is taken to describe the unstable fracture in the structure.

本文在对大型紧凑拉伸试件断裂实验和光弹性贴片法观察结果进行分析的基础上,寻找到适合于裂缝扩展问题的K_R阻力曲线断裂准则,提出了与此相等价且更为简单实用的双K断裂准则。

In this paper we propose the Stein estimate _(sL)(c)and the double k-class Stein-type estimate _(sL)(k_1,k_2)for coefficient of regression in linear constrained regression model.Both are nonlinear and biased constrained estimates for β,the coefficient of regres- sion.Under the criteria of mean square error,we obtain that _(sL)(c)and _(sL)(k_1,k_2)uniform- ly improve the constrained least squares estimate _L of when c and k_1,k_2satisfy some condi- tions for all β and o~2.Finally we extend the results to more...

In this paper we propose the Stein estimate _(sL)(c)and the double k-class Stein-type estimate _(sL)(k_1,k_2)for coefficient of regression in linear constrained regression model.Both are nonlinear and biased constrained estimates for β,the coefficient of regres- sion.Under the criteria of mean square error,we obtain that _(sL)(c)and _(sL)(k_1,k_2)uniform- ly improve the constrained least squares estimate _L of when c and k_1,k_2satisfy some condi- tions for all β and o~2.Finally we extend the results to more gerenalized linear constrained re- gression model.

本文提出线性约束模型下回归系数的 stein 估计和双k类 stein 型估计的概念,二者均为回归系数β的非线性约束有偏估计。在均方误差意义下,证明了:当所含参数满足一定条件时,对一切β和σ~2,它们一致地优于β的约束最小二乘估计(?)_L。最后,将结果推广到较一般的线性约束模型。

 
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