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对三种天然气压缩因子计算方法：经典热力学法、SGERG-88法、SY／T6143—1996法进行了介绍并对计算结果进行了对比，第一种方法的计算精度远不能满足贸易结算的要求，我国现行的第二种计算方法与ISO标准方法相比，在10℃以上的温度范围内基本相符，但在10℃以下的低温段则偏差较大。由此说明，我国目前所实施的计量标准与国际上认可的ISO标准方法之间有较大的偏差；同时，对不需要在线计算的场合，提出了一套基于数据拟合的计算体积修正系数的高精度近似方法，可提高体积计量仪表的性价比。     

实用天然气可采储量标定软件的开发及应用

针对天然气的开发特点，优选出了方便实用的可采储量标定方法。以气田开发数据库为基础，采用面向对象的程序设计语言VC＋＋，编制了可采储量标定软件，该软件集数据处理、物性参数计算、可采储量标定、结果输出4个模块为一体，计算快捷、迅速、准确，运行稳定、安全、可靠，提高了天然气可采储量标定的精度和工作效率。     

Performance variability is related to change in cognition: Evidence from the Victoria Longitudinal Study.

Performance variability across repeated task administrations may be an important indicator of age-related cognitive functioning. In the present investigation, the authors examined whether age differences and change in inconsistency were related to 6-year (3 occasion) cognitive change. Inconsistency scores were computed from 4 reaction time tasks performed by 446 older adults (54-89 years). Replicating previous cross-sectional results, greater inconsistency was observed for older participants even after controlling for differences in response speed. New longitudinal results demonstrated (a) associations between inconsistency at baseline measurement and 6-year change in cognitive performance; (b) longitudinal change in inconsistency; and (c) intraindividual covariation between 6-year change in inconsistency and 6-year change in level of cognitive function. These findings support the view that performance variability serves as a marker of cognitive aging. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

某厂锆（Zr）生产流程中不同产物的天然放射性核素含量测定

本文报道了某厂锆(Zr)生产流程中原料(锆英砂,主要成份为 ZrSiO_4)、半成品(ZrC,ZrCl_4)、废渣和成品锆中天然放射性核素~(238)U、~(226)Ra、~(232)Th 和~(40)K 含量测定结果。采用 NaI(Tl)γ能谱法进行测定,结果表明,原料、半成品和废渣中都含有一定的放射性,各生产环节应采取适当的防护措施;成品锆中基本不含放射性,可安全地应用于各个生产和生活领域。     

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日本政府采取一整套行之有效的政策措施来促进天然气消费，这套政策措施是：以立法的形式促进天然气消费，大力发展燃气企业，支持与鼓励天然气发电，大力发展燃气空调，支持和资助天然气实用技术的开发，以各种方式会同各家公司建立某些机构促进日本天然气产业的发展，采取财政信贷措施支持天然气的进口。对我国的启示是：建立和完善与天然气相关约法律法规体系，成立一些中介机构，鼓励开拓天然气利用的新途径，采取优惠措施鼓励居民使用天然气，同时政府应积极参与和支持新技术的研究、开发、应用和推广。     

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由于天然气输气管线埋在地下，在通球清管过程中，球的运行情况不能直接观察，管线入口和出口压力在球运行过程中的变化也不能提前预测，也难准确控制进气量，使球能以１ｍ／ｓ的速度到达出口，为此进行了天然气输气管线清管通球计算机仿真系统的设计与实现的研制。该仿真系统是在深入分析和研究天然气输气管线清管通球运行规律的影响因素的基础上，以数据库管理、计算机仿真技术和人工智能等新技术为主要工具来开发的。着重介绍了该仿真系统的总体结构与功能设计，软件编程与调试。该仿真系统能真实仿真清管球在管线内运行，通过对靖边—榆林输气管线多次清管通球的运行过程实际模拟，其符合率在９３％以上。     

Combining natural language with direct manipulation: the conceptual framework for a hybrid human-computer interface

This paper describes the development of a conceptual model of an interaction system for future human-computer interaction. It is suggested that an integrated system is the most promising solution for diverse users and tasks. A ' hybrid interaction system' is considered, which tries to efficiently direct manipulation, menu selection, and natural language. The mechanism of the natural language interface module is described in more detail. Finally, the allocation of functionalities for generalized tasks on the conceptual model is considered from the taxonomic approach.     

Response time variability

Response time variability is a new optimization problem with a broad range of applications and a distinctive number of theoretic flavour. The problem occurs whenever events, jobs, clients or products need to be sequenced so as to minimize the variability of time for which they wait for the next turn in obtaining the resources necessary for their advance. The problem has numerous real-life applications. We study its computational complexity, present efficiency, polynomial time algorithms for some cases, and the NP-hardness proof for a general problem. We propose a position exchange heuristic and apply it to improve the total response time variability of an initial sequence. The latter is the optimum bottleneck sequence, Webster or Jefferson sequence of the apportionment, or a random sequence. We report on computational experiments with the heuristic.     

Air entrainment in fresh concrete with PFA

The results of a study into the influence of PFA on air entrainment in fresh concrete are discussed It is shown that the required dosage of AEA to produce an air content of 5.5 ± 0.5% in a PFA modified concrete mix is two-six times that required in the corresponding neat OPC concrete mix. The dosage of a vinsol based air entraining agent (AEA) required appears to be directly related to the PFA content of the mix. Similar direct relationships were obtained with a range of different PFAs. The dosage of an AEA based on the salt of a fatty acid appears to be sensitive to both PFA and OPC contents. For the type of PFA used, the variability of measured air content or the amount of air retained after continued agitation both indicated that vinsol based AEAs show the highest variability whilst fatty acid based AEAs show low variability. The between batch variability of air content was significantly improved by the addition of PFA regardless of the AEA used.     

GEOCHEMICAL CHARACTERISTICS OF THE COAL－FORMED GASES IH THE EAST OF THE CENTRAL－ASIA COAL－FORMED GAS ACCUMULATION DOMAIN──SERIES STUDY Ⅱ ON THE CENTRAL－ASIA COAL－FORMED GAS ACCUMULATION DOMAIN

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