全文获取类型
收费全文 | 1205篇 |
免费 | 104篇 |
专业分类
各国政治 | 18篇 |
工人农民 | 8篇 |
世界政治 | 13篇 |
外交国际关系 | 228篇 |
法律 | 666篇 |
中国共产党 | 14篇 |
中国政治 | 36篇 |
政治理论 | 93篇 |
综合类 | 233篇 |
出版年
2024年 | 7篇 |
2023年 | 18篇 |
2022年 | 11篇 |
2021年 | 27篇 |
2020年 | 66篇 |
2019年 | 47篇 |
2018年 | 37篇 |
2017年 | 33篇 |
2016年 | 27篇 |
2015年 | 34篇 |
2014年 | 58篇 |
2013年 | 51篇 |
2012年 | 68篇 |
2011年 | 60篇 |
2010年 | 53篇 |
2009年 | 94篇 |
2008年 | 116篇 |
2007年 | 154篇 |
2006年 | 82篇 |
2005年 | 53篇 |
2004年 | 62篇 |
2003年 | 36篇 |
2002年 | 25篇 |
2001年 | 19篇 |
2000年 | 15篇 |
1999年 | 10篇 |
1998年 | 4篇 |
1997年 | 3篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 3篇 |
1993年 | 1篇 |
1992年 | 7篇 |
1991年 | 4篇 |
1990年 | 3篇 |
1989年 | 8篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 3篇 |
排序方式: 共有1309条查询结果,搜索用时 15 毫秒
81.
The Narrative Policy Framework (NPF) focuses on the role of narratives, drawing from a rich scholarship in narrative, language, and culture. Despite the understanding that narratives are constructions of language and that narrative construction differs across languages, NPF studies have not focused on policy narratives in languages other than English. Language characteristics of narratives are important to assess the stability of policy narratives when there are multiple dominant languages in a political system. This study investigates the use of narrative elements in policy narratives in agricultural biotechnology policy in India across Hindi and English media coverage to examine the NPF assumption that narratives have generalizable narrative elements irrespective of variation in linguistic context and, specifically, tests the transportability of narrative elements. Findings validate the transportability of narrative elements in Hindi narratives, indicate variation in the use of narrative elements over time, and have implications for applying NPF across languages. 相似文献
82.
Seismologists have reported that a majority of recent earthquakes in Oklahoma have been triggered by the activities of oil and gas companies. Despite this fact, there is evidence of strong opposition toward earthquake mitigation policy. In this article, we argue that how individuals define issues affect their policy choice. Furthermore, we incorporate the concept of venue shopping from the literature on macro theories of the policy process to investigate the effect of problem definition in shaping individual venue preference for policy choice. Using unique survey data, we find that problem definition, particularly issue causality and issue image, is strongly related to individual support for earthquake mitigation policy. However, a more nuanced relationship between individual problem definition and venue preference is observed. Our findings contribute to scholarly endeavors to understand the politics of problem definition at an individual level, which may be the precursor of understanding policy choices at the institutional level. 相似文献
83.
Since its inception in 2009, Uber has grown into a technology behemoth, with operations in over 70 countries and 500 cities around the world. Along the way, it has successfully forced regulatory upheaval in hundreds of local taxi markets controlled by municipal authorities. In this sense, Uber is not only a market disruptor, but also a policy disruptor. This paper examines the nature of such policy disruption at the local level by reviewing regulatory responses to Uber in ten North American cities. We find that regulatory outcomes are a function of two factors: Uber’s government relations strategy, either cooperative or confrontational, and the degree to which local governments perceive Uber as complementary or harmful to the existing marketplace. We conclude by proposing a typology of regulatory responses to Uber as a basis to identify patterns in the behavior of municipal regulatory authorities and political leaders. 相似文献
84.
Over the past decade, directional drilling and hydraulic fracturing enabled an unconventional oil and gas extraction (UOGE) boom in many regions of the United States, including parts of Pennsylvania. This revolution has created serious concerns about the capability of existing institutions to govern important societal outcomes associated with UOGE. We present a conceptual framework for assessing key societal outcomes influenced by UOGE governance. In applying this framework to Pennsylvania, we discern certain institutional strengths that have allowed the Commonwealth to reap appreciable short‐term economic growth from rich resource endowments. We also find, however, that several institutional weaknesses have allowed costs externalized to the environment, public health, and community integrity to offset some proportion of those economic benefits. Likewise, we find that governance of UOGE in Pennsylvania has contributed to a bifurcated sociopolitical landscape wherein adversarial coalitions dispute the legitimacy of the industry and its governance. 相似文献
86.
为验证siRNAs对猪繁殖与呼吸综合征病毒复制的抑制效果,构建了猪繁殖与呼吸综合征病毒NSP9基因与增强型绿色荧光蛋白基因GFP的融合表达质粒,并在Marc145细胞中进行了表达。通过RT-PCR方法扩增猪繁殖与呼吸综合征病毒NSP9基因,将其克隆入表达载体pEGFP-N1,并进行双酶切、PCR及测序鉴定。将阳性重组质粒转染Marc145细胞,检测绿色荧光蛋白的表达和NSP9基因转录水平。结果显示,经双酶切及PCR鉴定,目的基因的大小与预期相符。荧光显微镜和流式细胞仪均检测到细胞内绿色荧光蛋白的表达,荧光定量PCR检测到细胞内有NSP9基因的转录。本研究成功构建的猪繁殖与呼吸综合征病毒NSP9基因GFP融合表达质粒,为在细胞水平快速筛选有效的siRNAs提供了工具。 相似文献
87.
调查了广东省和福建省3 个市的6 个鸡场库蠓( Culicoids) 的种类、库蠓活动的季节动态及荒川库蠓( C.arakaw ai) 的夜间活动规律。共采集了2574 只库蠓,经鉴定共有6 个种,即荒川库蠓、尖喙库蠓( C.schultzei) 、奄美库蠓( C.am amiensis) 、大熊库蠓( C.okumensis) 、端斑库蠓( C.erairai) 和有须库蠓( C.palpifer) 。其中荒川库蠓和尖喙库蠓为所调查鸡场的优势蠓种,分别占总数的53 .70 % 和45 .92 % 。3 ~11 月是荒川库蠓和尖喙库蠓的活动季节,它们的活动高峰期分别是3 ~6 月和7 ~9 月。荒川库蠓7 月份整夜都活动,并在19∶00 ~21∶00 和03∶00 ~05∶00 呈现2 个活动高峰。 相似文献
88.
为建立检测非洲猪瘟病毒(African swine fever virus,ASFV)的快速诊断方法,本研究根据ASFV SY18株p17蛋白的编码基因D117L的保守序列设计并合成引物和探针,建立了基于ASFV p17蛋白的编码基因D117L的TaqMan荧光定量PCR检测方法,并验证其特异性、灵敏性和重复性。结果显示,本研究建立的TaqMan荧光定量PCR检测方法的C_t值与标准品在1×10^9~1×10^1copies/μL范围内呈良好的线性关系,相关系数为0.998,斜率为-3.192,检测下限为10 copies/μL,且与其他能引起相似症状的猪源病毒无交叉反应。重复性试验结果显示,组间与组内变异系数均小于1.920 7%,重复性好。此方法可用于ASF的早期诊断和ASFV快速检测。 相似文献
89.
我国《立法法》预设了最高人民法院提请全国人大常委会进行合宪性审查的路径。从现有裁判文书来看,最高人民法院在实践中并未遵循我国《立法法》所预设的路径,而是在绝大多数案件中回避了合宪性审查诉求,同时又在个别案件中进行了合宪性审查,陷入了完全回避与直接审查的两难困境。造成这种困境的原因在于,我国《立法法》对最高人民法院在合宪性审查中的权力基础、权力行使程序缺乏清晰的规定。对此,亟待通过法律解释进行明确和细化,否则最高人民法院将无章可循,无法贸然提请全国人大常委会进行合宪性审查。为了化解最高人民法院面对的这一困境,有必要对我国《立法法》第99条第1款进行解释,推导出该条款在授予最高人民法院提请审查权时,还隐含着另一项未被释明的权力即预审权,其共同构成最高人民法院在合宪性审查中的权力基础;同时,为了使预审权与提请审查权的行使制度化,有必要对其行使程序进行细化,建立起预审-提请审查机制。 相似文献
90.
以纯化的牛分枝杆菌重组MPT83蛋白为包被抗原,建立了检测牛分枝杆菌抗体的间接ELISA方法。确定了间接ELISA各组分的最适反应条件:抗原包被浓度为1μg/mL,酶标二抗稀释度为1∶1600,血清稀释度为1∶60,抗原和血清、血清和二抗均在37℃反应30 min,底物在37℃显色15 min,D655 nm阴性、阳性临界值为0.5。经阻断试验、交叉试验、重复性试验,表明该方法特异性强、重复性好。用该方法对18份结核菌素试验阳性牛血清和36份结核菌素试验阴性牛血清进行检测,结果显示,阳性血清的符合率为27.8%,阴性血清的符合率为91.7%。 相似文献