排序方式： 共有83条查询结果，搜索用时 125 毫秒
1.
动态空心圆柱扭剪仪(HCA)是目前国内外公认的最复杂、最尖端的室内土动力学试验设备。为了配合空心圆柱扭剪仪重塑样的制样,依据传统三轴重塑样击实器的原理,研制了空心圆柱重塑试样的击实器,来控制重塑样的相对密度和均匀度。实践证明,击实器可以满足重塑样制样的需要。 相似文献
2.
We describe an activity that introduces students to population modelling, enables them to use estimates obtained from a sample to infer back to the population, and understands how the findings are translatable via penguins and their poo! 相似文献
3.
小样本测量值正态分布的检验与可疑值的取舍 总被引：1，自引：0，他引：1
当消除了系统误差时，则量值的分布遵正态分布。根据这一基本原理，本文对小样本可疑值的取舍提出了一种新方法。该方法先检验小样本是否遵从正态分布。凡遵从正态分布的小样本，全部则量值都应该保留；对不遵从正态分布的小样本，再用统计量Ｆ进行舍弃，舍弃后的新样本，若遵从正态分布，余下的则量值都应该保留；若不遵从正态分布，还得继续舍弃，如果舍弃的则量值个数较多，仍不遵从正态分布，说明则量过程存在较大的系统误差或样本来自非正态总体。本文最后对小样本可疑值的取舍进行了评价 相似文献
4.
Walter G. Guder 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2014,24(1):25-30
In the 70ies of the last century, ther term “preanalytical phase” was introduced in the literature. This term describes all actions and aspects of the “brain to brain circle” of the medical laboratory diagnostic procedure happening before the analytical phase. The author describes his personal experiences in the early seventies and the following history of increasing awareness of this phase as the main cause of “laboratory errors”. This includes the definitions of influence and interference factors as well as the first publications in book, internet, CD-Rom and recent App form over the past 40 years. In addition, a short summary of previous developments as prerequesits of laboratory diagnostic actions is described from the middle age matula for urine collection to the blood collection tubes, anticoagulants and centrifuges. The short review gives a personal view on the possible causes of missing awareness of preanalytical causes of error and future aspects of new techniques in regulation of requests to introduction of quality assurance programs for preanalytical factors. 相似文献
5.
对比分析了5大社会阶层的体育消费意愿和行为。抽取10个国内城市为城市样本开展大样本调查,共收集4 372个有效样本,并使用SPSS16.0软件进行统计分析。有以下主要发现::1)社会上层的体育消费意愿显著高于其他阶层;2)社会上层的体育消费行为显著高于其他阶层;3)5大社会阶层的体育消费意愿大于体育消费行为;4)体育消费意愿与体育消费行为差异最大的是康复型消费和培训型消费。因此,不同社会阶层对于参与型、实物型和康复型消费意愿与行为差距有不同的差异。这对社会阶层与体育消费的关系研究提供参考。 相似文献
6.
This article demonstrates how to fit a statistical model to historical data, test whether the model can accurately predict enrollment out-of-sample, and use the results to segment admitted students into groups so that different recruitment and marketing interventions can be applied. Conceptual and practical issues are discussed, as well as policy considerations. 相似文献
7.
王平 《安徽职业技术学院学报》2003,2(1):9-10
本文对原棉含杂率试验方法中获取杂质的科学性提出了异议、分析了原因、并阐明了解决的方法 ,指出了努力的方向 相似文献
8.
虚拟仪器系统的软、硬件设计 总被引：1，自引：0，他引：1
叶娅 《长江工程职业技术学院学报》2005,22(3):25-26
阐述了虚拟仪器系统的设计与开发过程,并对系统进行了评估和说明. 相似文献
9.
刘媚 《宁夏师范学院学报》2010,31(3):19-22
应用EM算法之ECM算法,研究了混合分布在截尾数据场合下的参数估计问题,并给出具体的算式．说明EM算法是一种行之有效的方法． 相似文献
10.
Peter Denner Antony Norman Shu-Yuan Lin 《Educational Assessment, Evaluation and Accountability》2009,21(3):235-254
Acknowledging the necessity to establish the fairness and consequential validity of teacher candidate performance assessments
when they are used to make high-stakes decisions impacting entry into the profession, we investigated whether there were any
adverse results from the use of the Renaissance Teacher Work Sample (TWS) assessment at two universities as a consequence
of the age, gender, or race/ethnicity of teacher candidates. We also investigated education program and program entrance requirements,
such as Praxis I scores, and measures of grade point average, as general predictors of TWS success. The findings indicated
no disparate impact or adverse consequences based on the gender, age, or race/ethnicity of the teacher candidates. Selected
variables did predict a moderate amount of the variance of the TWS total scores of both preinterns and student-teaching interns.
The process used to determine the value implications of the results was also discussed. 相似文献