Relationship between the enzymatic determination of starch and the starch iodine index in two varieties of cider apple

Monitoring the hydrolysis or disappearance of starch by the starch iodine test is a simple procedure for determining the maturity of cider apples, but it does not indicate the exact amount of starch present. So far, studies of starch in apples have dealt exclusively with dessert apples. In this paper the relationship between the visual starch index, the dark‐coloured surface area and the real starch content was studied in two varieties of cider apple commonly used in Normandy (France). Starch determination in cider apples required adapting the protocol provided by the Boehringer enzymatic kit. The work led to proposing a simplified index with five scales instead of 10. This index gives the correspondences between the new and old scales as well as the probable starch contents for each new scale. © 2002 Society of Chemical Industry     

浅谈给水管聚丁烯PB、聚乙烯PE与铜管的选择

比较了铜管与聚丁烯PB管、聚乙烯PE管的综合材料性能、施工性能和经济性能,认为PB管、PE管的性价比高于铜管,更适用于全装修住宅或高品质住宅小区.     

战役战术导弹目标价值排序的模糊综合评判法

针对现代战争中战役战术导弹运用的特点，确定了战役战术导弹所打击目标价值的评判指标体系，并从分析目标价值的角度出发，用模糊综合评判法对战役战术导弹所打击目标进行价值分析，建立了打击先后顺序的评判模型．最后，用实例证明了，评判模型对战役战术导弹所打击目标进行价值排序的实用性和可行性。     

从限额设计谈投资控制

文章根据设计阶段投资控制的现状及存在问题,提出只有在设计行业全面推行限额设计,深化设计阶段的投资控制工作,才能从根本上体现全过程投资控制的理念,提高投资控制效果,节约建设工程总投资。     

Solar radiation climate in Malawi

Recently, Diabaté et al. [Diabaté, L., Blanc, Ph., Wald, L., 2004. Solar climate in Africa. Solar Energy 76, 733–744] created a map of solar radiation climate in Africa using clearness index for 62 sites. They established a solar climate class II located in Malawi and Madagascar. However, their analysis did not include any irradiation data from a site in Malawi. In this study, the solar radiation climate of Malawi has been studied using long-term global radiation data from a local site. The mean monthly (K_tm) and seasonal (K_ts) daily clearness indices for the site were computed. It is observed that K_tm has two maxima in a year (K_tm = 0.58 in May and K_tm = 0.64 in September), in close conformity with findings of Diabaté et al. (2004). Other results are presented and discussed.     

松嫩平原洪涝旱碱综合治理及水土资源可持续利用问题

文章依据松嫩平原洪、涝、旱、碱综合治理和在水土资源中存在的问题，提出必须加大科研力度，提高技术含量，从保护生态环境可持续开发利用自然资源的战略角度出发，综合治理洪、涝、旱、碱灾害，并提出了一些具体作法。     

在用航空润滑油可靠性评估方法的研究

介绍航空润滑油可靠性评估的相关质量指标及几种航空润滑油可靠性评估方法,分析了几种单参数航空润滑油可靠性评估方法,并提出两种基于油液多参数融合的油液工作状态分析方法,为提高航空润滑油的可靠性和按质换油提供有效的分析手段。     

模糊综合评价技术在住宅综合性能评估中的应用研究

依据《商品住宅性能评定方法和指标体系》正确地对商品住宅地性能进行评价 ,是评定商品住宅质量等级的重要依据。本文主要论述如何运用数学方法分析和处理住宅综合质量评定中大量存在的模糊问题以及如何建立相应的等级评价准则和进行等级评判     

DZX-2B型电子学综合实验装置常见故障与分析

介绍DZX-2B综合实验装置的组成、常见故障，及如何快速、准确的判断并排除故障的方法。     

Adsorption and decomposition of H2S on Pd(1 1 1) surface: a first-principles study

Gradient-corrected density functional theory was used to investigate the adsorption of H₂S on Pd(1 1 1) surface. Molecular adsorption was found to be stable with H₂S binding preferentially at top sites. In addition, the adsorption of other S moieties (SH and S) was investigated. SH and S were found to be preferentially bind at the bridge and fcc sites, respectively. The reaction pathways and energy profiles for H₂S decomposition giving rise to adsorbed S and H were determined. Both H₂S_(ad) → SH_(ad) + H_(ad) and SH_(ad) → S_(ad) + H_(ad) reactions were found to have low barriers and high exothermicities. This reveals that the decomposition of H₂S on Pd(1 1 1) surface is a facile process.