论FDI对西部制度变迁的影响及对策

本文首先对我国西部地区利用FDI的现状进行了描述 ,然后运用回归分析的方法分析了FDI和制度变迁的关系 ,指出FDI是影响区域制度变迁的重要因素 ,FDI在区域分布上的不均衡严重制约着西部地区制度变迁的进程。西部地区应该加快体制改革的步伐 ,改善投资环境 ,吸引FDI ,进而通过FDI带动西部地区制度变迁的进程 ,最终形成FDI和制度变迁相互推动、相互促进的良性循环。     

Holocene lake deposits of Bosten Lake, southern Xinjiang, China

A 9.25-m-long sediment core from Bosten Lake,Xinjiang, provides detailed information about changes in the water budget and biological acticity over the last 8400 cal-endar years. The chronology is constructed from six AMS radiocarbon dates on the terrestrial plant remains. Based onanalyses of TOC, CO3, detrital compounds and biogenic SiO2,lake level fluctuations and periods of remarkably-negative water budget appeared at 8.4-8.2 cal ka, 7.38-7.25 cal ka,5.7-5.5 cal ka, 3.7-3.4 cal ka and 3.3-2.9 cal ka, respec-tively. As they are in-phase with low lake levels at Sumxl Co and Bangong Co in western Tibet Plateau and with paleo-lakes in Inner Mongolia, a climate-induced change to some-what drier and warmer conditions is inferred. A further drop in lake level after 1320 AD of about 200 yr duration may heattributed to a negative water balance prior to the main phase of the Little Ice Age. Deep and stable lake phases of 1500 yr and 1800 yr duration at 7.2-5.7 cal ka and 5.5-3.7cal ka coincide with maximum moisture during the Holocene Megathermai in China. The long term trend towards aridity since about 4.3 cal ka can dearly be recognised. The reduced water budget of Bosten Lake from 640-1200 AD may be attributed to local effects.     

Temperature variations on the Tibetan Plateau over the last two millennia

The paleoclimate data recovered from ice cores,tree rings and lake sediments indicate regional features of cfimatic change on the Tibeta n Plateau (TP) during the last 2000 years. The composite temperature reconstructions in-dicate that several main climatic episodes, such as the “LittleIce Age“ between 1400 and 1900, the “Medieval Warm Pe-riod“ in 1150-1400, a less warm period in 800-1100, and an earlier cold period between the 3rd and 5th centuries,occurred in the TP. In addition, temperature varied from region to region. The period from AD 800 to 1100, which waswarm in northeastern TP, was contemporaneous with cool-ing in the western and southern TP. The southern TP ex-perienced warming between 1150 and 1400. For western TP,the δ^18O records of the Guliya ice core indicate that the pe-Hod 1250-1500 witnessed a clear warming. Large-scaletrends in the temperature history from northeastern TP aremore similar to those in eastern China than are the trendsfrom the Guliya ice cap far to the west and southern TP. The most prominent similarities between the temperature varia-tions of the TP and eastern China are such cold phases as 1100-1150, 1500-1550, 1650-1700 and 1800-1850, andthe latter three cold events match with three widespreadg lacial advances which occurred on the TP during the Little Ice A2e.     

改变水分子簇的结构及诱发的生物效应研究

概述了水分子簇理论研究的基本状况,以及改变水分子团簇结构的4种方法,包括外加磁场、外加电场、激光辐射以及直接加热法;最后简要介绍了改变水分子团簇结构所诱发的生物效应.     

并联电压负反馈输入、输出电阻的讨论

电路中引入负反馈,使输入、输出电阻均发生变化,并且输入、输出电阻对放大电路有很大的影响.从并联电压负反馈的角度,对输入电阻和输出电阻给出了下列4种方法的定量讨论.     

供需网环境下企业动态结构建模研究

针对传统供应链管理中存在的弊端，提出了多功能开放型供需网概念，在此基础上分析了多功能开放型企业供需网环境下企业动态结构的需求与特点，并建立了基于Multi-agent的企业动态结构及其协作模型．在此动态结构及协作模型中，系统的构成单元具有决策智能、自治、自组织和协作能力，支持企业动态重构，从而使企业具有以内部变化适应外部快速变化的能力．     

烟草中多酚氧化酶的生理生化特征及其活性控制的研究

对烟草叶中的多酚氧化酶(PPO)进行了部分纯化，对比了叶中PPO在苗期和田间的活性差异，研究了其活性变化规律，发现生长旺盛期PPO活性高于其他时期，研究了烟叶在不同水势条件下PPO活性变化规律，发现水势过高、过低，PPO活性均较低，在一872．78kPa水势条件下，PPO活性最高，所以细胞中的含水量是影响PPO活性的因素之一．研究了PPO在35℃、40℃、45℃、50℃、55℃、60℃、65℃、70℃和75℃等烘烤温度条件下的热敏感性，发现：酶的最适反应温度为35℃；温度由35℃升至75℃，活性逐渐下降，在每一温度下保持5min，活性趋于稳定，用回归法得出了烟叶中PPO的下降百分数与温度之间的关系式．用双倒数作图法比较了NaDiCa、EDTA、巯基乙醇和硫脲4种常用抑制剂对烟叶中PPO活性的抑制强度，结果表明：同一浓度下它们对PPO的抑制强度依次递减，而NaDiCa抑制效率明显高于其他3种抑制剂；CuCl2可以促进PPO活性，用回归法得出了活力增加百分数与二价铜离子浓度的关系式。     

人类活动与环境演变的关系--1949年以前户县冲积平原区研究

户县冲积平原区，区位环境优越，农业生产条件良好，周秦至今，一直是关中乃至全国发达的农耕文化区。人类活动使区内自然环境产生了重大变化，秦都咸阳，结束了区内自然环境的纯粹自然演变史，自此，区域生态系统不断退化，环境质量渐趋恶化。人类社会演变的许多重大事件，在环境演变过程中留下了深深的印记。畿辅地位变化、人口数量增减是本区环境演变的关键因子；政府行为对自然环境演变具有导向性作用。     

玉米秸秆直接还田配施促腐剂效应研究Ⅰ.对土壤氮素时空动态变化和作物产量的影响

通过2年田间定位试验,研究了冀东地区玉米秸秆连续直接还田对土壤氮素养分时空动态变化和作物产量的影响.结果表明,玉米秸秆直接还田可明显提高土壤氮素供应水平,增产作用显著.在秸秆C/N15∶1～35∶1范围内,调节秸秆不同C/N未改变秸秆还田后的转化进程,其转化对土壤氮素时空动态变化的影响亦无明显差异,增产幅度大致相当.在调节秸杆C/N的前提下配施促腐剂,使秸秆还田后的转化进程明显加快,与秸秆直接还田未配施促腐剂处理比较,可有效提高土壤供氮能力,显著增加作物产量.调节玉米秸秆C/N为35∶1并配施促腐剂是冀东地区小麦-玉米一年两熟种植制度下,玉米秸秆直接还田较好的施肥方式.     

论网络环境下高校图书馆用户需求的满足

从网络环境下高校图书馆信息用户的需求特点入手。分析了现阶段高校图书馆在传统文献服务、电子文献资源的利用、网络资源开发及信息咨询服务等方面存在的问题和障碍，并有针对性地提出了解决这些问题和障碍的对策和途径。