塔克拉玛干沙漠腹地参考作物蒸散量与蒸发皿蒸发量的对比分析

利用2005-2010年塔克拉玛干沙漠腹地气象资料计算了极端干旱区塔克拉玛干沙漠腹地参考作物蒸散量(ET0),并与气象站蒸发皿蒸发量(Ep)进行了对比分析及影响因素的灰色关联度排序。结果表明:极端干旱区ET0最大值出现于7月,最小值则出现在1月;Ep最大值分别出现在6月,最小值出现在12月。灰色关联分析表明,在年时间尺度上与ET0关系最为紧密的气象因子是Umean,其次是Tmax,而影响Ep气象因子最为紧密的气象因子是Tmax,其次是Umean;在春、夏、秋、冬四个季节尺度上夏季对影响ET0和Ep的气象因子差异最大。ET0与Ep在春、秋、冬三个季节都成极显著关系,而在夏季呈显著线性关系,因此在不同时间尺度上二者可以进行互相替换。     

本科教学工作水平评估——二级学院资料室发展的新机遇

普通高等学校本科教学工作水平评估，给二级学院资料室的发展带来了一线生机。阐述了评估前二级学院资料室的现状及存在的问题；评估中，抓住机遇积极开展文献资源的组织建设工作；提出了资料室评估后的发展方向。     

基于腾讯通RTX网络即时通信平台信息咨询服务探讨

本文阐述了广州铁路职业技术学院图书馆基于腾讯通RTX网络即时通信平台信息咨询的服务方式和具体应用的五个方面,探讨了图书馆使用该通信平台在信息咨询服务方面的长处。     

Marker assisted recurrent selection for cumulating QTLs for bread-making related traits

We used a computer program to manage marker data in a recombinantinbred line population. The objective was to select pairs of inbred lines tobe intercrossed, in order to cumulate all favourable alleles, either withadditive effects or with interactive effects. The population size required tohave 95% chance of obtaining the best line from a given cross iscomputed, taking into account the number of QTLs and the probability thatno recombination event occurs in any QTL confidence intervals. It is shownthat the accuracy of QTL location greatly affects selection efficiency andthat a recurrent selection scheme is highly preferable for pyramiding manyQTLs. Dough strength (W) was chosen to illustrate the use of this method.In a population of 187 DH lines from the cross Courtot × Chinese Spring,W was found to be controlled by 8 additive QTLs and two pairs ofinteractive QTLs. None of the 187 DH lines possess all favourable allelesor combination of alleles. The best possible line could be produced by asingle cycle of crossing followed by line extraction, but several thousandlines needed to be produced to achieve this goal. Alternatively, a recurrentcrossing scheme allows to obtain the best line in two generations, andrequires less than 150 lines per cycle.     

浅谈新世纪对高等学校专业资料室及管理人员的要求

本文分析了伴随新世纪一起到来的信息时代中，面对“知识爆炸”大量科技文献的出现，对高等院校专业资料室的新要求。在此基础上提出了专业资料室管理人员应具备的综合素质，以供专业资料室管理人员参考。     

网络环境下的图书馆参考咨询工作

网络的迅速发展，使图书馆参考咨询工作发生了巨大的变化。具备了传统图书馆咨询服务工作所不具备的某些特点。在网络环境下，积极组织馆藏信息资源；提供网络导航服务；开展多形式的网络参考咨询服务是图书馆参考咨询工作在网络环境下的对策。     

联盟管道阴极保护设计要点及其借鉴意义

联盟管道（Alliance Pipeline）阴极保护系统设计内容主要包括两个部分，即干线管道阴极保护和加压站阴保护。前者的设计依据是沿线土壤的电阻率及输电线路与管道交叉等参数，后者主要是加压站内深井阳极地床、整流器以及测试站等参数。介绍了这些参数的选取过程、确定方法和阴极保护系统的设计要点。对我国西气东输管道阴极保护系统有关设计参数与联盟管道阴极保护系统实际使用的参数进行了比较，结果表明，西气东输管道阴极保护选取的设计参数是合理的，认为联盟管道阴极保护系统的设计经验对指导我国长输管道的设计具有重要的借鉴意义。     

Confidence intervals on catch estimates from a recreational fishing survey: a comparison of bootstrap methods

Bootstrap methods are often used for confidence intervals on recreational fish catch estimates, because they are relatively robust and straightforward to implement. Such data are typically highly skewed and zero‐inflated, presenting difficulties for many estimation methods. However, bootstrap performance in many situations is not well understood. Inaccurate confidence intervals can cause management errors, and biased intervals can promote errors in one direction. Although the analyses originate from recreational fisheries data, the conclusions are generally applicable to similarly distributed data from other sources. Using simulation, non‐parametric bootstrap confidence intervals (bootstrap normal, bootstrap percentile, hybrid, bootstrap‐t, BC, and BCa) on catch rate and total catch estimates from a recreational fishing survey were compared. The intervals' coverage (proportion of times the ‘true’ mean fell within the confidence intervals) and relative bias were also compared. The bootstrap‐t, using a resample size of slightly less than n/2, provided confidence intervals with the most correct coverage for both parameters. Intervals were biased, usually substantially, for all other methods, with the commonly used bootstrap percentile among the more biased methods.     

有限长信号线性卷积计算的统一数学方法

引入有限长信号存在区间的上、下限及移动信号、参考信号概念，本文提出了简单直观、规律性强的有限长信号连续或离散时域线性卷积直接计算的统一数学方法与模型。     

电子文献资源与参考服务的调查与分析

通过对本校读者的问卷调查，分析中国科学技术大学科研人员对电子文献资源的使用及需求情况。针对读者对图书馆参考咨询工作的意见反馈，提出了一些相关改进的建议和对策。最后，对这次调查活动本身做了总结。