铁人精神在高校学生党建工作中的功能与运用

铁人精神是我国工人阶级不畏艰辛,勇于开拓进取的民族奋进精神,体现了社会主义核心价值体系的根本要求,将其运用在高校学生党建工作上则具有理想信念教育、榜样激励教育和文化传播教育的功能。因此,我们必须以铁人精神为思想政治教育载体,通过党课教学、校园文化和网络舆论等形式创新高校学生党建工作的方法和手段,不断增强高校党组织的创造力,探寻高校学生党建工作的新思路。     

非英语专业大学生英语口语输出“动机缺失”研究分析

动机缺失是二语学习领域中一个相对较新的研究课题。国内研究以描述性、解释性居多,实证性研究较少。通过问卷调查和数据,分析造成学生英语口语输出“动机缺失”的主要原因、不同原因对“动机缺失”的作用力差异以及这些原因对非英语专业大学生口语输出动机的不同影响。     

高校成人思想政治教育校园文化的缺失与重构

新的时代背景下,高校成人教育面临转型与改革的巨大挑战,其思想政治教育与校园文化建设作为引领成人教育转变发展的先导已经出现了不和谐现象。分析当前高校成人思想政治教育需求特性以及与校园文化建设的特殊关联性,探讨高校成人思想政治教育校园文化的缺失与重构策略,有利于对二者关系的正确认识,为高校成人教育的转型发展服务,促进其可持续发展。     

Cellulose degradation in the Vasa: The role of acids and rust

Abstract

The oak timbers of the Swedish warship Vasa are deteriorating. High amounts of oxalic acid have been found along with a low pH and low molecular weight cellulose deep in the wood timbers. The iron-rich surface wood differs from the interior wood in that it displays higher pH and cellulose with higher molecular weight. The objective of this study was to determine why there is a difference in cellulose degradation, pH, and oxalic acid amount between the surface region and the interior of the Vasa timbers. Analysis of cellulose weight average molecular weight by size exclusion chromatography was performed, as well as quantification of oxalic acid and iron by high-performance anion exchange chromatography and atomic emission spectroscopy, respectively. It was found that a decrease in iron content coincides with an increase in oxalic acid concentration and a drop in pH at a certain depth from the wood surface. When iron-rich surface wood samples from the Vasa were mixed with an aqueous solution of oxalic acid, a fast increase of pH over time was observed. Neither interior wood poor in iron nor the fresh oak reference showed the same neutralizing effect during the time of measurement. This indicates that the presence of iron (rust) causes a neutralization of the wood, through the formation of iron(III) oxalato complexes, thus protecting the wood from oxalic acid hydrolysis. This effect was not observed to the same extent for other acids observed in Vasa wood (sulfuric, formic, glycolic, and acetic acids).     

Iron removal from waterlogged wood: Extraction by electrophoresis and chemical treatments

Abstract

The presence of iron oxides (lepidocrocite, goethite) in archeological wood may result in a degradation of the wood matrix. Extraction of these iron oxides is largely dependent on their solubility. In this study, balsa wood samples were impregnated with iron oxides to test extraction treatments. Additionally, archeological wood samples were also examined to determine treatment efficiency. Electrophoresis and simple immersion treatments were performed using various chemical solutions: a neutral and a conductive substance (potassium nitrate), an acid (acetic acid), three alkaline chelating agents (tri-ammonium and tri-sodium citrate and sodium oxalate), three acidic and slightly acidic chelating agents (ethylenediaminetetraacetic acid (EDTA), citric acid, and oxalic acid), and a reductant (sodium dithionite). Potassium nitrate did not extract sufficient amounts of iron, irrespective of whether the treatment was conducted by electrophoresis or simple immersion; any observable dissolution was attributed to protonation because of the acidic pH around the anode (as low as 3). Dissolution in acetic acid did not extract iron with either treatment. Strong chelating agents improved extraction, and these compounds gave the best results for simple immersion, particularly EDTA. This chemical is well adapted for use on archeological objects because of its chemical properties (stability constant, speciation based on pH). The addition of sodium dithionite to the solution improved dissolution. Even though electrophoresis improved extraction (in particular for tri-ammonium citrate), none of the tested chelating chemicals were suitable for electrophoresis because of a significant increase in temperature as well as high anode corrosion. The presence of iron sulfide in the archeological wood limited the effectiveness of the tested chemicals. A pre-treatment in sodium persulfate was expanded to include oxidized iron sulfide in oxy/hydroxide iron, which improved the extraction rate.     

新四军文化建军管窥

抗战初期组建的新四军原本是一支文化缺乏的军队,后来因为新四军领导者大力延揽人才,善于使用人才,营造学习氛围,使新四军成为政治素质硬、文化素养高、军民关系密切的人民军队,新四军的成功的文化建军之路,对当今社会的文化建设具有较大的启示作用。     

递增负荷运动训练对大鼠红细胞及血红蛋白的影响

以大鼠为研究对象,通过跑台建立大鼠递增负荷的运动模型,探讨长期运动对机体血细胞参数和血红蛋白含量的影响。结果显示一次性运动后大鼠的红细胞破坏增多,红细胞计数减少,随着负荷的逐渐增加,RBC显著下降,在第五周运动后降至最低;平均红细胞容积的变化则与红细胞总数变化相似,说明可综合RBC、MCV与血红蛋白来评定运动性贫血。一次性运动后即刻,血红蛋白水平有所升高,然后逐渐恢复到正常水平,说明运动导致机体脱水,血浆减少,血液浓缩,但这只是一种相对升高。五周递增负荷运动后血红蛋白含量有逐渐降低,在第五周降至最低,且不能恢复到正常水平：说明长期坚持高强度大运动量训练,如果恢复时间不多,则会出现明显的血红蛋白下降,导致运动性贫血,严重影响运动员的运动能力和恢复能力．     

铁尾矿利用经济分析模型与应用

在技术及选矿工艺等因素的制约下,我国历史上铁矿资源回收率偏低,进而导致了大量铁尾矿的产生。目前,铁尾矿资源回收利用技术及设备问题已基本解决,而且铁精矿价格日益高涨,促使国内铁尾矿资源开发利用的外部条件日益成熟。尤其是在国内外铁矿石价格高企的今天,使得铁尾矿资源开发利用更加具有经济价值和可行性。在借鉴矿床经济品位计算原理的基础上,通过适当的类推及数学极限处理而导出了铁尾矿资源回收再选的经济分析模型。在广泛收集铁矿山相关经营参数及预计未来铁精矿价格走势的基础上,通过计算认为我国铁尾矿资源回收再选的临界品位定在7%是比较经济合理的,并提出了免除铁尾矿资源回收再选的税金及其基建投资贷款利息减半的政策优惠设想。     

Effect of oral ingestion of different forms of silver on tissue content of some essential elements in chicks

Silver is ingested in India in the form of varak, Ayurvedic bhasm and water contained in silver utensils, but nobody knows their effects. We have examined the effect of interaction of silver ingested in the form of varak (leaf), bhasm (ash) and water (colloidal solution) on some essential elements (Na, K, Ca, Mg, Cu, Fe and Zn) in blood, liver, spleen and kidneys of chicks. The results showed significant rise of silver in all the tissues and significant fall in copper in the blood. The greatest rise was obtained in blood silver by silver sol while it had the lowest amount of silver. Iron significantly increased in tissues but somewhat decreased in blood. Zinc content increased in all the tissues by leaf and ash but decreased by sol. No consistent pattern was seen in case of other elements.     

我国职业体育产业政府规制的动因分析

职业体育产业的垄断性、外部性、信息不对称等市场失灵问题会导致资源配置无法达到帕累托最优状态。同时,现阶段我国职业体育产业还存在着诸多市场欠缺问题。因此,在我国市场化导向的体育体制转轨过程中,政府规制扮演着重要的作用,不仅要解决市场失灵问题,还要解决市场欠缺问题。尤其是在市场机制不能到位的较长时期内,一定条件下,还需要政府实行积极的规制政策。