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桩底注浆钻孔灌注桩承载力的研究 被引量:14
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作者 李连营 林波 邵建 《岩土工程技术》 2005年第1期24-27,共4页
通过天津地区几例钻孔灌注桩桩底注浆的静载荷试桩结果 。
关键词 钻孔灌注桩 桩底注浆 后压浆 计试比 水泥土
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预应力管桩单桩竖向极限承载力分析 被引量:23
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作者 李连营 路清 《岩土工程技术》 2003年第4期220-223,共4页
通过天津地区几例预应力管桩的静载荷试桩结果 ,分析天津地区预应力管桩单桩竖向极限承载力标准值的估算及与《建筑桩基技术规范》(JGJ 94— 94)和天津市《岩土工程技术规范》(DB 2 9— 2 0— 2 0 0 0 )
关键词 预应力管桩 计试比 “土塞”效应
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钻孔灌注桩抗拔承载力的估算 被引量:4
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作者 李连营 雷钢 刘东 《岩土工程技术》 2006年第2期91-93,共3页
通过天津市区五例钻孔灌注桩作为抗拔桩的静载荷试桩结果,分析天津地区钻孔灌注桩作为抗拔桩的单桩竖向极限承载力标准值的估算方法。
关键词 钻孔灌注桩 抗拔桩 计试比
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天津地区灌注桩桩底注浆承载力估算公式研究
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作者 聂细江 李连营 温煦 《山西建筑》 2015年第18期79-81,共3页
通过天津地区42个场地钻孔灌注桩桩底注浆的静载荷试桩结果,采用1st Opt曲线拟合软件对实测试桩数据进行拟合并建立回归计算公式,分析了天津地区钻孔灌注桩桩底注浆单桩竖向极限承载力估算值的估算方法和估算公式。
关键词 钻孔灌注桩 桩底注浆 曲线拟合 回归算公式 计试比
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Carbon Reduction Policies: A Regional Comparison of Their Contributions to CO_2 Abatement in Six Carbon Trading Pilot Schemes in China
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作者 XIU Jin-Feng CHOU Jie-Ming +2 位作者 DONG Wen-Jie YANG Zhi-Yong DAI Ru-Feng 《Atmospheric and Oceanic Science Letters》 CSCD 2015年第4期233-237,共5页
The contributions of carbon reduction policies were evaluated and compared for six carbon trading pilot schemes in China, in four municipalities(Beijing, Shanghai, Tianjin, and Chongqing) and two provinces(Guangdong a... The contributions of carbon reduction policies were evaluated and compared for six carbon trading pilot schemes in China, in four municipalities(Beijing, Shanghai, Tianjin, and Chongqing) and two provinces(Guangdong and Hubei). The carbon emissions accounting method of the Intergovernmental Panel on Climate Change was used to calculate the actual CO2 and the support vector machine model was used to predict CO2. Chinese carbon reduction policies abated CO2 in the six carbon trading pilot schemes after the comprehensive policies came into force. However, the contribution of policies to CO2 abatement varied among regions, and the effect of carbon reduction policy on municipality pilot schemes was greater than on provincial pilot schemes. The largest contribution of carbon reduction policy to CO2 abatement was 28.3%, for the pilot carbon trading scheme in Beijing, and the smallest contribution was 3.7%, for that in Hubei. It is crucial to consider "carbon leakage" and a carbon trading linking program in order to evaluate the effects of carbon reduction policies. 展开更多
关键词 CO2 abatement carbon trading pilot scheme support vector machine reduction contribution
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A Statistical Power Comparison of the Kolmogorov-Smirnov Two-Sample Test and the Wald Wolfowitz Test in Terms of Fixed Skewness and Fixed Kurtosis in Large Sample Sizes 被引量:1
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作者 Otuken SENGER 《Chinese Business Review》 2013年第7期469-476,共8页
In this study, the statistical powers of Kolmogorov-Smimov two-sample (KS-2) and Wald Wolfowitz (WW) tests, non-parametric tests used in testing data from two independent samples, have been compared in terms of fi... In this study, the statistical powers of Kolmogorov-Smimov two-sample (KS-2) and Wald Wolfowitz (WW) tests, non-parametric tests used in testing data from two independent samples, have been compared in terms of fixed skewness and fixed kurtosis by means of Monte Carlo simulation. This comparison has been made when the ratio of variance is two as well as with equal and different sample sizes for large sample volumes. The sample used in the study is: (25, 25), (25, 50), (25, 75), (25, 100), (50, 25), (50, 50), (50, 75), (50, 100), (75, 25), (75, 50), (75, 75), (75, 100), (100, 25), (100, 50), (100, 75), and (100, 100). According to the results of the study, it has been observed that the statistical power of both tests decreases when the coefficient of kurtosis is held fixed and the coefficient of skewness is reduced while it increases when the coefficient of skewness is held fixed and the coefficient of kurtosis is reduced. When the ratio of skewness is reduced in the case of fixed kurtosis, the WW test is stronger in sample volumes (25, 25), (25, 50), (25, 75), (25, 100), (50, 75), and (50, 100) while KS-2 test is stronger in other sample volumes. When the ratio of kurtosis is reduced in the case of fixed skewness, the statistical power of WW test is stronger in volume samples (25, 25), (25, 75), (25, 100), and (75, 25) while KS-2 test is stronger in other sample volumes. 展开更多
关键词 Kolmogorov-Smimov Two-Sample (KS-2) test Wald Wolfowitz (WW) test statistical power SKEWNESS KURTOSIS
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The Generalized Clinical Trial Outcomes
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作者 Xi Chen 《Journal of Mathematics and System Science》 2013年第4期167-172,共6页
The clinical trial based on the likelihood ratio test has many preferred statistical properties such as asymptotic and self-adaptive properties. Along with the constant MCID (minimum clinical important difference), ... The clinical trial based on the likelihood ratio test has many preferred statistical properties such as asymptotic and self-adaptive properties. Along with the constant MCID (minimum clinical important difference), the conventional trial outcomes can be expanded into the strict, aggressive and conservative outcomes; it makes the interpretations of trial conclusion more flexible. Besides, it will show that the trial goal and trial outcome are different concept. The trial goal switching is not a statistical issue, but a clinical decision. 展开更多
关键词 Trial goal trial outcome STRICT aggressive and conservative outcomes.
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MOVING RATIO TEST FOR MULTIPLE CHANGES IN PERSISTENCE
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作者 Zhanshou CHEN Zheng TIAN 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2012年第3期582-593,共12页
This paper proposes a moving ratio test, which is a modified version of ratio test by involving a bandwidth parameter, to detect multiple changes in persistence, and to determine the direction of switch. The asymptoti... This paper proposes a moving ratio test, which is a modified version of ratio test by involving a bandwidth parameter, to detect multiple changes in persistence, and to determine the direction of switch. The asymptotic distribution as well as its consistency are established. In order to estimate the change points, the authors propose a two step estimate approach. Simulations illustrate the performance of the test and estimate procedures in finite samples. An application to the analysis of Sweden/US foreign exchange rate demonstrates the validity of the procedure in practice. 展开更多
关键词 BANDWIDTH multiple changes in persistence moving ratio test.
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Empirical Likelihood Approach for Treatment Effect in Pretest-Posttest Trial
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作者 Qixiang HE 《Chinese Annals of Mathematics,Series B》 SCIE CSCD 2012年第6期941-948,共8页
The empirical likelihood approach is suggested to the pretest-posttest trial based on the constrains, which we construct to summarize all the given information. The author obtains a log-empirical likelihood ratio test... The empirical likelihood approach is suggested to the pretest-posttest trial based on the constrains, which we construct to summarize all the given information. The author obtains a log-empirical likelihood ratio test statistic that has a standard chi-squared limiting distribution. Thus, in making inferences, there is no need to estimate variance explicitly, and inferential procedures are easier to implement. Simulation results show that the approach of this paper is more efficient compared with ANCOVA II due to the sufficient and appropriate use of information. 展开更多
关键词 Empirical likelihood Pretest-posttest trial Treatment effect
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