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131.
金宗俊 《安徽农业大学学报(社会科学版)》2001,10(3):41-42
在科学技术高速发展的今天,必须推进农业科学技术的转化与应用。全椒县建立了以科技示范户为辐射点的农技推广新路子,使科技示范户成为科技引进的尖兵、科技推广的桥梁、科技示范的骨干、科技试验的助手、科技致富的样楹;成为农技推广体系中的重要组成部分。同时本文也探讨了科技示范户的形成与发展、教育与培训、管理与扶持等问题,籍以引起在实际操作中的思考。 相似文献
132.
Nick Allum 《Risk analysis》2007,27(4):935-946
Few scholars doubt the importance of trust in explaining variation in public perception of technological risk. Relatively little, however, is known about the particular types of judgments that people use in granting or withholding trust. This article presents findings from an empirical study that explores several dimensions of trust relevant for citizens' judgments of scientists involved in the development of GM food. The relationship between particular dimensions of trust and perceptions of GM food risk is also explored, using structural equation modeling. Results suggest that trust judgments based on the perception of shared values are most important in relation to GM food risk, but that judgments about scientists' technical competence are also important. 相似文献
133.
Yi-Hau Chen & Hung Chen 《Journal of the Royal Statistical Society. Series B, Statistical methodology》2000,62(3):449-460
We propose a unified approach to the estimation of regression parameters under double-sampling designs, in which a primary sample consisting of data on the rough or proxy measures for the response and/or explanatory variables as well as a validation subsample consisting of data on the exact measurements are available. We assume that the validation sample is a simple random subsample from the primary sample. Our proposal utilizes a specific parametric model to extract the partial information contained in the primary sample. The resulting estimator is consistent even if such a model is misspecified, and it achieves higher asymptotic efficiency than the estimator based only on the validation data. Specific cases are discussed to illustrate the application of the estimator proposed. 相似文献
134.
刘成有 《湛江师范学院学报》1999,(2)
本文用统计的方法导出范德瓦尔斯方程及修正值的具体表达式,并讨论修正量与状态量的关系,给出刚性球分子对气体体积、压强所造成的影响. 相似文献
135.
136.
Peter Congdon 《Journal of applied statistics》2011,38(4):745-767
Recent analyses seeking to explain variation in area health outcomes often consider the impact on them of latent measures (i.e. unobserved constructs) of population health risk. The latter are typically obtained by forms of multivariate analysis, with a small set of latent constructs derived from a collection of observed indicators, and a few recent area studies take such constructs to be spatially structured rather than independent over areas. A confirmatory approach is often applicable to the model linking indicators to constructs, based on substantive knowledge of relevant risks for particular diseases or outcomes. In this paper, population constructs relevant to a particular set of health outcomes are derived using an integrated model containing all the manifest variables, namely health outcome variables, as well as indicator variables underlying the latent constructs. A further feature of the approach is the use of variable selection techniques to select significant loadings and factors (especially in terms of effects of constructs on health outcomes), so ensuring parsimonious models are selected. A case study considers suicide mortality and self-harm contrasts in the East of England in relation to three latent constructs: deprivation, fragmentation and urbanicity. 相似文献
137.
In this article, we propose a class of additive transformation models for recurrent event data, which includes the additive rates model as a special case. The new models offer great flexibility in formulating the effects of covariates on the mean function of recurrent events. Estimating equation approaches are developed for the model parameters, and asymptotic properties of the resulting estimators are established. In addition, a model checking procedure is presented to assess the adequacy of the model. The finite sample performance of the proposed estimators is examined through simulation studies, and an application to a bladder cancer study is presented. 相似文献
138.
孙仁斌 《长江大学学报(社会科学版)》2000,(5)
证明半线性抛物型方程柯西问题的解在一定条件之下在有限时刻熄灭 ,并在不同条件之下对解的熄灭时间分别进行估计 相似文献
139.
本文应用通用函数Y及其变分原理,为求解具有自由面流动问题提出了一种新方法。将物理平面变换成映象平面。在映象平面上,引出通用函数Y,并且写出关于Y的变分原理。用这个变分原理及有限元法求解自由面流动可克服边界未知的困难。文中以水坝闸门出流问题为例进行了计算,结果表明,该方法是非常有效的。 相似文献
140.