论Lab-Corder测量太阳电池伏安特性的实验技巧

在Lab-Corder测量太阳电池伏安特性实验中,只要改变二个可变电位器的负载大小,就可以完成本实验的数据测量.但Lab-Corder采集到的数据及图形往往不是很理想,达不到预期的结果.在实验过程中如何进行才能得到我们想要的实验结果呢？在本实验中实验的技巧是至关重要的一环,本文重点探讨其实验的技巧及方式方法对实验的结果影响.     

大型钢模壳的开发与施工技术

中国建筑文化中心展厅及以上的楼层 ,设计采用了适合公共建筑的无粘结预应力双向密肋板结构体系 ,取得了很好的综合效益。施工在选用支模方案时 ,开发了大型钢模壳 ,代替了现常用的塑料模壳、玻璃钢模壳 ,不仅为本工程降低了投资、提高了外观质量 ,且为今后推广这类结构时 ,提供了实践经验     

产业结构调整中家具质量安全风险评估技术的探讨

我国是家具制造大国,经济转型中,我国要逐步完善家具服务业,建立家具质量安全风险评估机制,确保障我国家具产品质量安全。     

浅析互感器校验仪的使用技术要点

由于铁心磁阻的存在,互感器在传变电流的过程中就会产生误差,各种类型的互感器的基本误差是通过互感器校验仪完成的。所以互感器校验仪是电力系统中不可或缺的重要设备。但是由于它的工作线路比较复杂,要求必须合理使用。本文就互感器校验仪的使用技术谈几点看法。     

活性二氧化锰制备技术研究进展

文章综述了近年活性二氧化锰制备技术的研究进展,介绍了几种常用的活性二氧化锰制备技术。     

Elicitation of Expert Opinion in Benefit Transfer of Environmental Goods

Benefit transfer is a method for estimating the value of environmental goods that involves the use of past information on identical or similar goods. This paper considers the extent to which benefit transfer can be based on prior distributions elicited from expert opinion. We propose two alternative methods to elicit the parameters of a prior distribution from experts on environmental valuation. An experiment is carried out on the value of National Parks in Spain. The results from the elicited distributions are compared with the information provided by onsite samples of visitors. The results indicate that individual experts made different predictions about the potential value of the policy areas that were diverse and unable to accurately predict the value for each policy site. However, the average across the elicited distributions approaches the estimated distribution with empirical data and accurately predicts the relative values for the two policy sites considered.     

图像三维重建技术

基于图像的三维重建属于计算机视觉中的一个重要的研究方向,从提出到现在已有十多年的历史。文章首先对三维重建技术做了详细阐述,并着重从计算机图形学的研究角度对基于图像建模技术进行了综述,介绍了具有代表性的基于图像建模的方法及其最新研究进展,给出了这些方法的基本原理,并对这些方法进行分析比较,最后对基于图像建模技术的未来研究给出了一些建议和应解决的问题。     

Reduced-bias tail index estimation and the jackknife methodology

In the context of regularly varying tails, we first analyze a generalization of the classical Hill estimator of a positive tail index, with members that are not asymptotically more efficient than the original one. This has led us to propose alternative classical tail index estimators, that may perform asymptotically better than the Hill estimator. As the improvement is not really significant, we also propose generalized jackknife estimators based on any two members of these two classes. These generalized jackknife estimators are compared with the Hill estimator and other reduced-bias estimators available in the literature, asymptotically, and for finite samples, through the use of Monte Carlo simulation. The finite-sample behaviour of the new reduced-bias estimators is also illustrated through a practical example in the field of finance.     

金属矿山酸性废水治理技术现状与展望

对金属矿山酸性废水的来源、危害和治理技术进行了分析,对普遍采用的中和沉淀法的各种处理工艺进行了重点比较、分析,同时简单介绍了生物处理法、人工湿地法、氧化还原法、萃取电积法等矿山酸性废水治理方法,并对金属矿山酸性废水源头控制技术进行了展望。