首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   222篇
  免费   22篇
各国政治   7篇
工人农民   3篇
世界政治   1篇
外交国际关系   8篇
法律   150篇
中国共产党   3篇
中国政治   24篇
政治理论   18篇
综合类   30篇
  2023年   9篇
  2022年   3篇
  2021年   3篇
  2020年   15篇
  2019年   6篇
  2018年   6篇
  2017年   6篇
  2016年   7篇
  2015年   6篇
  2014年   22篇
  2013年   35篇
  2012年   29篇
  2011年   28篇
  2010年   26篇
  2009年   8篇
  2008年   7篇
  2007年   7篇
  2006年   6篇
  2005年   4篇
  2004年   2篇
  2003年   3篇
  2002年   1篇
  2001年   1篇
  2000年   2篇
  1999年   2篇
排序方式: 共有244条查询结果,搜索用时 15 毫秒
121.
跨国低碳投资已经形成了相当的规模,随着世界经济向低碳经济转变,其潜力将不可限量,我国低碳投资也方兴未艾。本文在总结和介绍目前国际碳交易市场机制下低碳投资的趋势与投资模式的基础上,重点分析了我国低碳投资现金流模型与投资风险管理。  相似文献   
122.
当今社会,低碳理念在国际贸易中已然形成一种新风尚。但是,当我们提倡发展低碳经济的同时,也不得不正视国际贸易中低碳壁垒的快速发展。在此背景下我们可以清楚地看到,低碳壁垒作为一种新型非关税壁垒正在逐步成为中国开展对外贸易的新障碍。对这一问题进行探讨具有重大的理论和现实意义。本文在介绍低碳经济时代背景的基础上,剖析了低碳壁垒形成的主要原因,并进一步阐明了其主要表现形式和对我国出口贸易的影响,在此基础上,提出了健全我国应对低碳壁垒的法律机制的意见与建议,以期对我国在实践中应对低碳壁垒有所帮助和启发。  相似文献   
123.
在线浏览等低碳阅读方式已经成为了用户方向,我们有必要重新审视纸本期刊在图书馆的馆藏定位。有感于此,对期刊在馆藏策略方面存在的结构性缺失进行了分析,文章数据凸显的是期刊馆藏与用户认可度的巨大反差,进而从低认可度导致的期刊高闲置率描述了低碳阅读与网络环境背景下期刊馆藏的内在趋势,以期能够进一步理顺电子期刊与传统期刊的馆藏比例,合理配置资源、降低成本。  相似文献   
124.
追溯与寻明:国际法视角下的碳排放权单位研究   总被引:1,自引:0,他引:1  
自以《京都议定书》为基础的市场化机制建立以来,经过近20年的发展,全球碳金融市场呈现蓬勃发展的态势,交易量大幅提升,成交金额不断攀升,市场化机制在夯实中不断完善和发展。同时,争端与纠纷日益增加,国际多边环境公约调整下的碳排放权机制部分地在WTO体制下进行规制,成为众多学者的憧憬。碳排放权单位体现的既不是GATT框架下的"产品",也不是GATS框架下的"服务",而是在经济上反映出特殊的金融衍生产品的属性。然而,碳排放权单位交易商提供服务的行为契合GATS金融服务要求,因此交易商可依据GATS享受跨国服务领域中的最惠国待遇,并可将与WTO规则相关的争端诉诸WTO争端解决机制,实现环境争端解决的规范化、法制化。  相似文献   
125.
血液样品中防腐剂对碳氧血红蛋白稳定性的影响   总被引:1,自引:0,他引:1  
目的研究临床上常用8种试剂对血液样品中碳氧血红蛋白(HbCO)稳定性的影响。方法将血液样品分为高、低两个HbCO浓度组,选用临床常用的甲醛、氟化钠、乙二胺四乙酸二钠、亚硝酸钠、草酸钾、肝素钠、柠檬酸钾及氟化钠与草酸钾混合物(1:3)8种试剂,按常用浓度分别添加到血样品中,并于添加后0h、2h、8h、24h、3d、7d用紫外可见光分光光度法检测其中HbCO饱和度,用统计学方法进行结果分析。结果本实验选用的8种试剂只有甲醛和亚硝酸钠对HbCO的稳定性影响较为显著,而其余6种对HbCO稳定性的影响无统计学意义。结论在检验疑似CO中毒并经甲醛或亚硝酸钠防腐的检材时应慎重,以免导致错误的鉴定结论。  相似文献   
126.
Abstract: Variations in gunshot residue (GSR) compositions are used in the reconstruction of shooting incidents. In this study, GSR samples taken from seven different locations around and in the firearm were collected and analyzed using scanning electron microscopy/energy dispersive X‐ray analysis. Four different types of ammunition were applied. Very low correlations were found when different ammunition were used. This clearly shows that it is possible to differentiate between ammunition types. When the same ammunition was used, high correlations were found between samples taken from external positions (such as hands of shooter, bullet‐entrance holes) but poor correlation was found between internal samples (such as firearm barrel, cartridge case) and external samples. A high degree of association was found between samples that simulated victim and shooter. These findings clearly demonstrate that GSR comparison studies are meaningful but care needs to be taken when choosing suitable exhibits. External samples (such as hands of shooter, bullet‐entrance holes) are more suitable candidates than internal samples (barrel of the firearm, cartridge case).  相似文献   
127.
Abstract: A comprehensive review of the scientific literature on gunshot residue (GSR) is presented. Aspects of both inorganic and organic GSR are discussed, from formation and distribution, to sample collection, preparation, and analysis using a variety of techniques. The interpretation of GSR results is also considered including issues surrounding the contamination, distribution, and transfer of GSR. Potential problems with ulterior sources of GSR like particles have been reported in the literature. For example, particles from environmental and occupational sources have been highlighted as exhibiting similar chemical and morphological characteristics to GSR. These findings are put into context with regard to interpreting samples. A move toward a “case by case” approach is argued to be more preferable to a “formal” classification system where possible. The analysis of both inorganic and organic compositions of residue samples as well as morphological considerations is considered to be a more ideal approach to GSR analysis, whereever practicable.  相似文献   
128.
Isotopic data obtained from human remains can provide information about an individual's origin, migration, and diet. We evaluate the usefulness of carbon, oxygen, strontium, and lead isotopes for forensic investigations by comparing data from Bulgarian teeth with data from other regions. Geo‐referencing based on oxygen or strontium isotopes can be misleading due to overlap with other countries in Europe and other continents. Carbon and lead isotopes, in combination with oxygen and strontium isotopes, provide the most useful information for identification of local vs foreigner status. In particular, high‐precision Pb isotopes show a distinct “Bulgarian” range; however, it is possible that individuals from other countries in Eastern Europe and/or central to western Asia could have overlapping isotopic values. Additional high‐precision multi‐isotope data from modern humans from different regions in the world are required to transition from speculative to more quantitative estimation of a geographical place of origin for unidentified human remains.  相似文献   
129.
The defendant, the driver of the questioned car, allegedly extended his right arm over the passenger seat and fired a single shot from a 380 pistol out the passenger window with the pistol's breech within the car. A simulation of this shooting scenario using the same model car, but different year, was conducted to quantitate gunshot residue (GSR) contamination of interior surfaces within the car. The test car's dash and headliner/window frame above the pistol had the heaviest GSR contamination. The dash GSR from airborne deposition documents a firearm discharge within the vehicle. Transfer from GSR‐contaminated hands or clothing to the dash is unlikely. The heavy GSR contamination of the headliner/window frame above the pistol likely documents the window from which the pistol was fired, but additional experiments are needed to verify.  相似文献   
130.
气候的异常、能源的紧缺掀起了低碳经济的浪潮,作为煤炭占能源主导地位的国家,由于高碳的性质,使得我国煤炭行业节能减排的任务繁重,而且现在煤炭行业存在产业整体性差、资源浪费严重、后备资源不足、煤矿规模结构不合理、环境污染严重等一系列问题,为了做好节能减排工作,煤炭行业要从系统节能、资源耦合、企业转型、融资租赁等方面着手,由高碳向低碳转变,促进煤炭行业低碳经济的发展。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号