磺基水杨酸铜络离子稳定常数的测定

本文采用pH电位滴定法测定磺基水杨酸铜络离子的稳定常数,得到了比较准确的结果(与文献值比较)。该法适用于弱酸根离子或弱碱分子作配位体的单核络合物稳定常数的测定。     

太行山区典型植被下降水入渗的稳定同位素特征分析

本研究以位于太行山区北部的河北易县崇陵流域为对象,对流域内三种典型植被（荒草、刺槐林、侧柏林）下不同深度土层的土壤水及流域内降水进行同步观测及取样,室内进行稳定同位素氘和氧-18含量测定,以^18O为例对降水入渗过程中的稳定同住素变化进行了研究。通过对2004年的数据进行分析,获得崇陵流域当地大气降水线（δD=6．244δ^18 O—7．158,R^2=0．7727,n=55）,其降水中稳定同位素时间变化波动较大且缺少规律性,降水中稳定同位素含量同降水量呈二次相关关系,大于15mm的降水雨量效应较显著。土壤水中的稳定同位素较降水普遍富集,其中荒草地土壤水中稳定同位素值较刺槐林地和侧柏林地整体偏高,表现出较强的蒸发分馏作用。土壤水中的δ^18O的时间变化波动较大,表层10cm土壤水δ^18O受降水中的δ^18O直接影响,呈现一定的响应关系。深层次土壤水中δ^18O变化则有一定滞后性。不同植被覆盖下δ^18O的时间变化的活跃层深度不同,同其土壤特征和植被覆盖类型有关。δ^18O的剖面垂向空间变化上有两种类型,随深度增加基本都呈富集的趋势。土壤水中稳定同位素的时间变化和垂向空间分布,反映了一种降水入渗和蒸散发的平衡关系,其垂向空间变化很好地记录了降水从地表向下入渗的过程。     

南宁市房地产业对经济发展的影响及应对措施

房地产业的运行不仅关系到国民经济的发展,还和人民群众生活息息相关。近几年来,我国很多地区房价快速飙升,远远超过了居民收入的增长,南宁市亦不例外。虽政府多有调控,但因刚需的存在,房地产价格仍只升不降。诚然,房地产能通过拉动建筑行业、金属业、家电业、金融业、建材行业等多行业的发展短期内极大的刺激经济的快速增长,但长期来说,房价的高涨挤压了人们的消费能力,不利于经济的稳健运行,同时,房价过高存在泡沫的风险,一旦泡沫破灭,经济和社会都会产生动荡。所以,政府应维持房地产的健康运行,将住房价格控制在与人均可支配收入水平相适应的程度,打击房地产投机炒作,挤出泡沫,引导房价回归理性,实现经济社会的长期稳定。     

Characterization of (68)Zn uptake, translocation, and accumulation into developing grains and young leaves of high Zn-density rice genotype

Zinc (Zn) is an essential micronutrient for humans, but Zn deficiency has become serious as equally as iron (Fe) and vitamin A deficiencies nowadays. Selection and breeding of high Zn-density crops is a suitable, cost-effective, and sustainable way to improve human health. However, the mechanism of high Zn density in rice grain is not fully understood, especially how Zn transports from soil to grains. Hydroponics experiments were carried out to compare Zn uptake and distribution in two different Zn-density rice genotypes using stable isotope technique. At seedling stage, IR68144 showed higher ⁶⁸Zn uptake and transport rate to the shoot for the short-term, but no significant difference was observed in both genotypes for the long-term. Zn in xylem sap of IR68144 was consistently higher, and IR68144 exhibited higher Zn absorption ratio than IR64 at sufficient (2.0 μmol/L) or surplus (8.0 μmol/L) Zn supply level. IR64 and IR68144 showed similar patterns of ⁶⁸Zn accumulation in new leaves at seedling stage and in developing grains at ripening stage, whereas ⁶⁸Zn in new leaves and grains of IR68144 was consistently higher. These results suggested that a rapid root-to-shoot translocation and enhanced xylem loading capacity may be the crucial processes for high Zn density in rice grains.     

基于局部敏感哈希算法的语音文档主题分类

对识别后的语音文档进行了向量空间模型的建立,针对得到的高维稀疏矩阵提出了基于局部敏感哈希的语音文档分类算法,算法能够直接在高维稀疏矩阵上进行分类,无需降维。此外,在构建局部敏感哈希函数的时候结合了稳定分布。实验证明,局部敏感哈希算法能够对语音文档进行合理有效的分类,同时获得了较小的时间复杂度。     

Molecule matters

Divalent carbon compounds which were once considered as highly reactive organic intermediates have been tamed by the modern day synthetic chemist in the form of N-heterocyclic carbenes. The land marks in the history of development of these compounds and their applications as ligands in the Nobel Prize winning work on olefin metathesis catalysts are described. Anil J Elias is a professor at the Department of Chemistry, Indian Institute of Technology, Delhi.     

Apparent Decline As A Sign Of Improvement? or,Can Less Be More?

Improvement of a system need not be the usual growth expected of dynamic systems. Decreasing variability, an important index of improvement, is discussed. The disappearance of 0.400 hitters from professional baseball can be better understood under such an assumption. Other examples illustrating the apparent paradox are also mentioned.     

企业稳定人才队伍对策研究

人才是兴国之源，创业之基。有了人才就有了资本，失去了人才就失去了财富。就企业而言，企业的竞争从根本上说是人才的竞争，企业的兴衰存亡关键在人才。随着完全市场化的到来，经济竞争日趋激烈，企业发展对人才的依赖越来越强。而目前相当一部分国有企业面临着较为严峻的人才危机，人才队伍不稳，人才流失严重。在激烈的人才竞争中，企业如何吸引人才、留住人才，保持人才队伍的稳定，是一个关系国家、企业发展命运的大事。本文通过分析国有企业人才流失的基本现状及人才流失的主要原因，针对目前企业在稳定人才方面存在的问题和不足，就如何吸引、留住和用好人才，稳定人才队伍提出以下对策建议：①要以能力和业绩为导向，建立公平竞争、优胜劣汰的人才使用机制；②要建立完善持续高效的人才培养机制；③要注重业绩和贡献，建立完善人才激励机制；④要充分发挥市场配置人才资源的基础性作用，建立能上能下、能进能出、人尽其才的人才流动机制；⑤要建立以人为本的企业文化。     

铜陵狮子山铜金矿田成矿流体成分及稳定同位素地球化学

Shizishan ore-field is a nonferrous and noble metal ore-field which is most rich in copper and gold. There are many types of fluid inclusions in minerals of the deposits. The homogeneous temperatures and the salinities of the fluid inclusions in main mine     

科技创新团队成员两人非对称冲突博弈演算应用研究

随着科技的发展,以科技创新团队进行科研和工作的形式已经成为现代创新社会生产条件下的内在要求,然而在科技创新团队迅速发展中,团队内部表现出了各种形式的冲突。以A公司科技创新团队的真实案例为例,以博弈模型中团队成员在工作中自身得益的计算结果为基础,通过调整科技创新团队成员间的奖金分配额度,选择冲突策略的惩罚力度以及适当的补偿等措施,使科技创新团队成员在工作过程中逐渐产生建设性冲突,达到使团队成员在工作过程中保持积极合作的目的,从而为科技创新团队管理者提供一种可量化的团队管理方式。