Macrozoobenthos of floodplain waters of the rivers rhine and meuse in the Netherlands: A structural and functional analysis in relation to hydrology

The river systems of the Rhine and Meuse include a large number of floodplain waters showing differences in hydrology and geomorphology. A classification of 100 water bodies based on their macroinvertebrate communities has been worked out as a tool for ecological management. Analyses were performed on structural (species composition) and functional (trophic relations) aspects of macrozoobenthos in relation to hydrological, vegetational, and physicochemical parameters. Based on the classification of macroinvertebrate communities, three major groups of water bodies can be distinguished, which are related to the frequency of inundation. The flood frequency constitutes the major environmental gradient which structures the zoobenthos communities in the Dutch floodplain waters. Faunal composition is mediated by substrate availability, water chemistry, and the availability of nutritional resources. This typology serves as a basis for the prediction of the impact of hydrology changes on the macrozoobenthic communities of floodplain waters of highly eutrophic and polluted rivers.     

论云南磷矿的地位与发展

本文阐述了云南磷矿资源在经济建设和农业发展中的地位和作用，并对影响其发展的制约因素，机遇与对策作了探讨。     

An enumeration scheme to generate constrained exact checkerboard patterns

Checkerboard patterns belong to a special class of 2-stage guillotine patterns that require less machine time to be cut. In this paper we propose an enumerative algorithm to generate exact constrained checkerboard patterns. At each node of the enumeration tree a constructive procedure is used to generate a feasible pattern. In addition, an upper bound on the objective function value is calculated to decide whether further branching from the node is worth. The algorithm was implemented and computational tests were performed. The test results indicate that the proposed scheme outperforms previous methods of the literature in terms of execution times.     

Parsing with restricted quantification: an initial demonstration1

The primary goal of this paper is to illustrate how smaller deductive search spaces can be obtained by extending a logical language with restricted quantification and tailoring an inference system to this extension. The illustration examines the search spaces for a bottom-up parse of a sentence with a series of four strongly equivalent grammars. The grammars are stated in logical languages of increasing expressiveness, each restatement resulting in a more concise grammar and a smaller search space. A secondary goal is to point out an area where further research could yield results useful to the design of efficient parsers, particularly for grammatical formalisms that rely heavily on feature systems.     

基于遥感技术的聊城市主要水域变化分析

利用遥感技术和地理信息系统相关软件对聊城市1987年和2000年两期遥感影像进行处理，提取水体分类图，计算出两个时期主要水域面积变化，重点分析了东昌湖6个湖区的水域面积变化数据。研究表明聊城市的主要水域减少了20．59％，湖泊水域面积增加了10．97％。     

Restricted randomization and multiple responses in industrial experiments

Two issues regarding designed experiments are discussed; restrictions on randomization and multiple responses. The former is typically related to hard‐to‐vary factors and factors appearing in separate stages of a process experiment. Randomization restrictions should be taken into account in the construction of the design as well as in the statistical modelling. In the paper, a case study of sausage production is discussed, having a split‐plot model with correlated multiple responses. Multiple responses are handled in two ways, by principal component analysis (PCA) followed by ANOVA of the principal components, and by a newly developed alternative, the ‘50–50 MANOVA’. Multiple tests of correlated response variables are also described. Practical aspects of the planning, performing, response measurements, and statistical analysis are emphasized throughout. Hence, the paper aims to extend the utility of statistical methods in industry by linking design of experiments to multivariate analysis of the responses. Copyright © 2007 John Wiley & Sons, Ltd.     

Preliminary Investigation into the Microbiological Quality of a Freshwater Bathing Site: A Case for Official Identification?

The quality of recreational waters has become of increasing importance and, where water-based activities are permitted, such waters should be required to comply with minimum standards to protect public health. At present, there are no freshwater sites in the UK which are identified as official bathing areas, despite a significant proportion being identified in other EU Member States and the increasing use of such waters for bathing. This paper presents a case for the official identification of three freshwater bathing sites which, traditionally, have been used for bathing for more than ninety years.     

某建筑上部高耸构筑物拆除施工工艺

既有建筑高耸构筑物部分的拆除不同于一般破碎拆除,为避免对下部结构的破坏,需采用保护性静力拆除,同时受周边环境及空间的影响,拆除施工及废物清运过程中须用到大型且相对灵活的机械和车辆。既有建筑物一般周边环境相对复杂,受相邻建筑物影响,场地空间局限性较大,对各种机械及车辆的约束较多,采用常规机械及拆除方式难以实施。本文以某建筑上高耸构筑物部分拆除工程为例,介绍复杂工况下的高耸构筑物保护性拆除关键施工工艺。