Determination of the field of a permanent-magnet disk machine using the concept of magnetic charge

An analytical solution of the dependence of the field distribution on the three-spatial coordinates in a permanent-magnet (PM) disk machine is obtained using the concept of magnetic charge and the method of images. A good correlation between the analytical solution and experimental data validates the method described. It is further indicated how this method can be extended to more complex problems. It is applicable to other PM machines, such as permanent-magnet linear synchronous motors.<>     

Fractionation and characterisation for antioxidant activity of hydrolysed whey protein

Whey protein isolate (WPI) was hydrolysed for 1 h using Alcalase, Protamex and Flavourzyme. Native WPI, hydrolysed WPI and two commercial WPI hydrolysates were subjected to fractionation by size exclusion chromatography. Antioxidant activity of WPI fractions was measured with a liposome‐oxidising system (50 µM FeCl₃/0.1 µM ascorbate, pH 7.0). Lipid oxidation was measured as thiobarbituric acid‐reactive substances (TBARS). Gel electrophoresis and amino acid analysis were run to identify the peptide composition. The influence of amino acid composition on antioxidant activity was evaluated using multivariate analysis methods (correlation analysis, principal component analysis, multiple linear regression and discriminant analysis). TBARS assays indicated the presence of antioxidant activity in all protein fractions, including non‐hydrolysed WPI. For native and hydrolysed WPI samples the first fraction (> 45 kDa) showed a higher TBARS inhibition effect (24–27%) when compared with lower‐molecular‐weight fractions and hydrolysate mixtures. In contrast, for commercial WPI hydrolysates a higher inhibitory effect was found in most of the lower‐molecular‐weight fractions (30–55%). The ability of WPI fractions to delay lipid oxidation was found to be related to the prevalence of histidine and hydrophobic amino acids. Copyright © 2004 Society of Chemical Industry     

预热预分解系统设备的设计(一)

对预热器、分解炉、热风管道附属设备的结构尺寸、计算公式、改进方法等方面作了详细阐述。     

Preparation of branched polyacrylonitrile through self‐condensing vinyl copolymerization

Branched polyacrylonitrile (PAN) was prepared through a self‐condensing vinyl copolymerization of acrylonitrile and 2‐(2‐bromopropionyloxy)ethyl acrylate (BPEA). The branched architecture of the product was confirmed by NMR spectra and the average degree of branching (DB ) was estimated. Through a comparison of the intrinsic viscosity of the product with that of its linear analogue, the contraction factor g′ was calculated. It was found that the viscosity of the branched PAN was obviously lower that that of linear PAN. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

SN388地震仪道间感应分析及排除方法

通过分析SN388地震仪所得的地震记录，发现炮点的能量越强，炮点附近的地震道感应越大。通过实验得出结论，炮点附近的感应是由道间串音引起的，采取适当措施就可解决这种问题。     

一种网络服务自动部署方法

为满足网络服务使用者对网络服务部署的功能性和非功能性需求,运用Petri网的方法进行了互联网动态多变环境下的网络服务自动部署的研究,建立了一种基于Petri网的网络服务部署网模型,从形式化的角度描述了网络服务功能的部署情况,提出了一种按照服务质量来选择最优网络服务部署的算法。仿真的结果表明,与目前常用的固定部署算法和随机部署算法相比,按照该方法得到的网络服务部署能最好地满足服务使用者对服务的非功能性方面的需求。     

碱熔法氯化法制备氯氧化锆的技术经济比较

由于我国核电工业的发展对金属锆、铪的需求将大幅增加,根据国家规划,至2020年我国将再建30座核电站,届时核电装机容量将由目前的57×105 kW增到约34×106 kW.核级海绵锆、海绵铪的用量将达到103t.以国内公司的生产运行指标为例,比较了碱熔法、碳化氯化法和沸腾氯化法3种制备氯锆方法的技术经济指标.比较结果表明,3种方法中沸腾氯化法成本最低,其单耗成本依次为沸腾氯化法为8 345元,碱熔法为9 117元,碳化氯化法为12 505元.     

套管井声波成像测井资料的采集与应用

过套管利用偶极子声波成像测量获得地层横波资料，在理论上讲是可行的。但此项目不仅国内测井公司未进行过现场作业，就连美国哈里伯顿公司也没有此项目的现场作业经验。新疆测井公司通过认真制订测井方案，克服了各种困难，首次顺利获得了优质的地层横渡资料，开创了测井技术史上在套管井中获得横波资料的先例。     

P2井特殊烃组分气测异常显示层探讨

正常的油气显示层气测组分分布遵循一定的规律，而准噶尔盆地西北部的P2井在钻探过程中发现了不符合正常气测分布规律的气测异常显示层，由此引起多方关注与争议。在简述该井气测异常特点及特殊性基础上，对其产生原因进行了探讨，认为第一气测异常层无C1、C2值是由于该层原油为未成熟原油，裂解、降解不彻底所致，第二、第三显示层只有C1则是由于该层为稠油层，C1是微生物降解的结果。通过对相邻区块资料分析，进一步提出了以气测全烃曲线形态为主结合垒烃相对幅度与全烃饱满程度图板的气测异常显示解释评价方法，对于指导其他区块类似情况的研究具有参照作用。     

论江西省农村饮水安全工程规划

本文通过参与江西省农村饮水安全工程规划的工作的实践经验，重点介绍了江西省农村饮水安全工程规划的一些工作方法和过程，并对其江西省农村饮水安全工程规划进行了总结。