宝泉电站上水库工程施工监理工作

在河南国网宝泉抽水蓄能电站上水库工程监理过程中,中国水利水电建设工程咨询公司施工监理一部始终坚持以监理委托合同、施工承包合同和监理规范为依据,围绕"三控制、二管理、一协调"这一监理工作的核心内容,以安全为前提,以质量为中心,以进度为主线,以投资为重点,以效益为目标的监理原则,进行施工全过程全面的动态控制,使工程建设始终处于受控状态。     

Data space mapping for efficient I/O in large multi-dimensional databases

In this paper, we propose data space mapping techniques for storage and retrieval in multi-dimensional databases on multi-disk architectures. We identify the important factors for an efficient multi-disk searching of multi-dimensional data and develop secondary storage organization and retrieval techniques that directly address these factors. We especially focus on high dimensional data, where none of the current approaches are effective. In contrast to the current declustering techniques, storage techniques in this paper consider both inter- and intra-disk organization of the data. The data space is first partitioned into buckets, then the buckets are declustered to multiple disks while they are clustered in each disk. The queries are executed through bucket identification techniques that locate the pages. One of the partitioning techniques we discuss is especially practical for high dimensional data, and our disk and page allocation techniques are optimal with respect to number of I/O accesses and seek times. We provide experimental results that support our claims on two real high dimensional datasets.     

分布式多媒体系统通信平台及若干相关技术的探讨

近十年来，分布式多媒体系统得到了很快发展，在很多关键技术领域取得了重大进展，同时也面临着不断出现的新型应用提出了新的挑战，本文控制分布式多媒体系统通信平台及相关技术并展望今后的研究方向。     

Spray Drying of Skim Milk Mixed with Milk Permeate: Effect on Drying Behavior, Physicochemical Properties, and Storage Stability of Powder

The possibility of using milk permeate (MP) to lower the protein level of skim milk powder (SMP) in producing powders of 34% and lower protein is explored. Skim milk suspensions with various levels of MP were prepared by mixing SMP and MP powder (MPP) at the ratios of 1:0, 7:3, 3:7, and 0:1: from 34 to 5.3% protein. The suspensions were dried in a spray dryer with inlet and outlet temperatures of 180 and 80°C, respectively. Increasing permeate concentration in the mixture showed a greater tendency to stickiness manifested by lowered the cyclone recovery of the powder as more powder stuck on the wall of the dryer. Increasing permeate concentration in the resultant powder did not significantly affect the bulk density but led to a reduction in the particle size and also made the powder slight green and yellowish in color. It also found to lower the glass transition temperature (T_g) of the skim milk powder (SMP) and induce crystallization of lactose at lower water activity (a_w ≥ 0.328 for SMP:MPP of 3:7 and 0:1 compared to a_w ≥ 0.0.432 for SMP:MPP of 1:0 and 3:7). Addition of MP in SMP lowered the T_g values of the resulting powders. The permeate fraction in spray-dried SMP/MPP mixtures found to lower the critical a_w and moisture content, suggesting the SMP mixed with MPP is more likely to become sticky than SMP alone (at 34% protein) when stored at a similar water activity and moisture content.     

料仓清堵助流装置—空气炮的应用

料仓内物料起拱、堵塞是一较普遍存在的问题，采用空气炮破拱、清堵，改善料仓内物料的流动性是一种较理想的方法。本文介绍了国内外有关空气炮的开发研制和应用情况，以及空气炮的功能、特点和工作原理，给出了空气炮喷爆能量的计算方式，并对空气炮的选用方法及安装要点作了介绍，可供参考。     

Choosing Pipe Diameter to Maximize Inline Storage Volume

For a wastewater collection system, the maximum volume that can be attained with an inline storage pipe is shown to occur when the pipe diameter is chosen to be 2/3 of the thickness of soil profile available for burial of the storage pipe, irrespective of pipeline slope.     

Pattern of egg distribution by Adzuki bean beetle,Callosobruchus chinensis (L.) (Coleoptera: Chysomelidae) in stored chickpea under natural infestation

Under laboratory experimental condition female Adzuki bean beetles, Callosobruchus chinensis (L.) are known to evenly distribute their eggs over grains available for egg laying. However, currently there are no data on pattern of egg distribution by Adzuki bean beetle in large quantity of chickpea grain stored for extended period of time. The objective of this study was to determine the number and distribution of eggs among grains of chickpea stored in large quantity for 8 months and subjected to natural infestations. The experiment was conducted under room temperature and relative humidity at Debre Zeit Agricultural Research Center. The chickpea cultivars used were Natoli (desi type, 22 g per 100 seeds with Tuberculated seed coat texture) and Arerti (kabuli type, 26 g per 100 seeds with smooth seed coat texture) and for each cultivar there were 21 replicas of bags (40 cm wide and 70 cm high). From each bag, which contains 10 kg each, 25 chickpea grain samples were randomly selected at monthly intervals and examined for the presence or absence of Adzuki bean beetle eggs. Grains with eggs were categorized into frequency classes (i.e. 0, 1, 2, …, n) based on the number of eggs present on them. The variance to mean ratio was used to decide the type of egg dispersion pattern. In all the sampling dates and on both cultivars, the variance to mean ratios were highly significantly greater than one indicating that egg distribution by female Adzuki bean beetles on grains of chickpea was aggregated type. Moreover, further analysis of data had shown that the egg distribution pattern perfectly fits the negative binomial distribution, which confirms that the pattern of egg distribution on chickpea grains was aggregated/clumped type.     

张楚汉院士称:白鹤滩水电站综合技术指标居世界前列

从每一个单项来说,白鹤滩水电站的指标都不是最高的,但综合了库容等五个方面的指标,其综合难度就处于世界前列。在世界上,270 m到300 m等级的高拱坝设计建设中,遇到这么多的高指标,并不多见,白鹤滩工程必将带动我国高拱坝建设水平的进一步提高。     

天然气水合物储运技术综述

天然气是一种广泛应用的重要化工原料和绿色能源，具有广阔的开发利用前景。由于天然气资源分布不均，需要进行远距输送。NGH储运即以天然气水合物的方式储运天然气是一种新型的既安全可靠，又能大幅降低运输费用的储运方式，具有广阔的运用前景。从四个方面分析了水合物储运的相关技术，指出了存在的问题，并对应用前景进行了展望。     

SXBP：基于Pri—order编码的XML文档存储方法

随着XML技术的发展，如何利用现有的数据库技术存储和查询XML文档已成为XML数据管理领域研究的热点问题。本文介绍了一种新的文档编码方法，以及基于这种编码方式提出了一种新的XML文档存储方法。方法按照文档中结点类型将XML文档树型结构分解为结点，分别存储到对应的关系表中，这种方法能够将任意结构的文档存储到一个固定的关系模式中。同时为了便于实现数据的查询，将文档中出现的简单路径模式也存储为一个表。这种新的文档存储方法能够有效地支持文档的查询操作，并能根据结点的编码信息实现原XML文档的正确恢复。最后，对本文提出的存储方法和恢复算法进行了实验验证。