有关CATIA软件的几个使用技巧

在使用CATIA过程中,由于此软件的功能繁多,经常会遇到一些使用问题.针对工作过程中经常遇到的几个问题,提出了不同的解决技巧供相关人员参考,以便在工作中可以针对实际情况而有所选择.     

积极开展高校情报服务提高高校情报的利用率

论述了高等院校科技情报工作者应如何提高开展高校情报工作和如何提高高校情报的利用率.如提高图书馆管理人员情报意识,积极开展定期定向跟踪服务,进行文献利用统计等.     

Effect of non-narcotic analgesics on anticoagulant-induced hypoprothrombinemia in rats

Résumé Chez le rat, un traitement à l'acide acétylsalicilique, au salicilate sodique et au phénylbutazone fait remonter le taux de protrombine abaissé par la bishydrocoumarine.     

Arabidopsis boron transporter for xylem loading

Boron deficiency hampers the productivity of 132 crops in more than 80 countries. Boron is essential in higher plants primarily for maintaining the integrity of cell walls and is also beneficial and might be essential in animals and in yeast. Understanding the molecular mechanism(s) of boron transport is crucial for alleviating boron deficiency. Here we describe the molecular identification of boron transporters in biological systems. The Arabidopsis thaliana mutant bor1-1 is sensitive to boron deficiency. Uptake studies indicated that xylem loading is the key step for boron accumulation in shoots with a low external boron supply and that the bor1-1 mutant is defective in this process. Positional cloning identified BOR1 as a membrane protein with homology to bicarbonate transporters in animals. Moreover, a fusion protein of BOR1 and green fluorescent protein (GFP) localized to the plasma membrane in transformed cells. The promoter of BOR1 drove GFP expression in root pericycle cells. When expressed in yeast, BOR1 decreased boron concentrations in cells. We show here that BOR1 is an efflux-type boron transporter for xylem loading and is essential for protecting shoots from boron deficiency.     

非化学专业“分析化学”课程教学现状与改革措施探析

为更好地培养学生的化学素质和创新能力,结合目前高校非化学专业"分析化学"课程的教学现状,从激发学生兴趣、优化教学内容、强化实验环节、科学评价学生成绩等方面提出了改革的思路,探索出了一些可行的方法.     

原子核电四极矩跃迁强度新经验公式

通过分析8≤Z≤100偶偶原子核电四极矩跃迁强度B(E2:0+→2+)与2+态激发能E(2+)实验数据,提出了原子核电四极矩跃迁强度新经验公式B(E2:0+→2+)=33.65Z2 A-0.71 E-1(2+).     

基于智能手机的移动学习在大学生中的应用研究

随着移动通信技术的快速发展和智能手机功能的显著提升,丰富多样的学习资源为大学生群体实现移动学习提供了便利,学习者可根据实际需求随时随地进行移动学习,摆脱时间和空间的束缚,适应现代生活节奏的加快.该文运用文献、调查、经验总结和行动等研究法,从移动学习的角度出发并结合智能手机的特点,探讨了基于智能手机的移动学习在大学生群体中的应用情况,并对未来生活中大学生利用智能手机进行移动学习的趋势进行了展望.     

都江堰市土地利用／覆盖变化研究

借鉴使用土地利用类型净变化量、交换变化量和总变化量的计算方法,以都江堰市中心城区2005年和2009年土地利用数据为基础(2005年数据为土地利用现状数据、2009年数据为土体利用规划数据),对都江堰市中心城区土地覆被变化过程进行了分析研究,得出都江堰市中心城区农用地、园林地、建设用地以及其他土地的覆被变化情况.     

紫外荧光法水中油在线检测系统的研究

采用独特的"溢流式采样"技术结合非接触式荧光光谱技术来实现水中油的在线检测,样品无需萃取、分离等预处理.测量过程中水样和传感器没有直接接触,独特的采样方法最大限度地减少了水中悬浮颗粒对测量产生的影响.实验结果表明,本方法能实现连续在线检测,无需药剂,无消耗品,无污染、真正环保.测量精度0.1 mg/L,相对标准偏差＜1.5%.     

Investigating the influence of habitat type and weather conditions on the population dynamics of land snails Vertigo angustior Jeffreys, 1830 and Vertigo moulinsiana (Dupuy, 1849). A case study from western Poland

The conservation of land snails has become an urgent issue because of the current global decline of this group. Detailed knowledge of population dynamics is needed to develop an appropriate strategy for conservation. We investigated the population dynamics of two threatened European land snail species: Vertigo angustior and Vertigo moulinsiana. Although the species may be found at the same site, V. moulinsiana is more tolerant of wetter conditions than is V. angustior. Abundance data for the two species were collected at two sites (one drier and one wetter) in western Poland biweekly during the spring and summer months in 2008 and 2009. In the drier year, snail abundance was similar between the drier and wetter sites. In the wetter year, snail abundances were generally higher than in the dry year, except that the inundation-intolerant V. angustior became less abundant at the wetter site. We conclude that weather affects different species differently and therefore should be considered along with the habitat features in interpreting survey results for land snails.