首页 | 官方网站   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   358篇
  免费   47篇
  国内免费   41篇
农业科学   11篇
艺术   4篇
地球科学   225篇
航空航天   1篇
生物科学   15篇
文化教育   22篇
经济   15篇
环境安全   2篇
自然科学   14篇
社会科学   20篇
历史地理   11篇
工业技术   42篇
语言文字   7篇
文学   4篇
数理化   5篇
医药卫生   10篇
军事   2篇
哲学宗教   18篇
政治法律   17篇
交通运输   1篇
  2024年   1篇
  2023年   1篇
  2022年   8篇
  2021年   10篇
  2020年   9篇
  2019年   18篇
  2018年   12篇
  2017年   17篇
  2016年   10篇
  2015年   13篇
  2014年   17篇
  2013年   31篇
  2012年   12篇
  2011年   17篇
  2010年   12篇
  2009年   19篇
  2008年   21篇
  2007年   14篇
  2006年   27篇
  2005年   24篇
  2004年   23篇
  2003年   13篇
  2002年   14篇
  2001年   9篇
  2000年   10篇
  1999年   12篇
  1998年   9篇
  1997年   7篇
  1996年   8篇
  1995年   8篇
  1994年   3篇
  1993年   7篇
  1992年   6篇
  1991年   4篇
  1990年   8篇
  1989年   2篇
  1988年   2篇
  1986年   2篇
  1985年   1篇
  1983年   1篇
  1979年   1篇
  1963年   1篇
  1961年   2篇
排序方式: 共有446条查询结果,搜索用时 15 毫秒
11.
贫困与相对贫困:影响青少年越轨与犯罪的因素   总被引:1,自引:0,他引:1  
贫困不是青少年越轨和犯罪的必然原因,因贫困产生的社会问题和主体变异却是青少年越轨和犯罪的重要原因。在社会转型期,最大限度地实现社会公平,并形成健康的社会心理环境,是预防青少年越轨与犯罪的关键因素。  相似文献   
12.
Abstract

In this article we examine the interplay between the severity of a brand transgression, consumers’ prior awareness of the firm’s corporate social responsibility (CSR) initiatives, and the firm’s response (apology vs. apologia) on the rates of forgiveness among consumers. Results of two experiments show that consumers’ prior awareness of the firm’s CSR initiatives significantly differentiates apologia from apology, with the effect of apology on consumer forgiveness being more apparent when brand transgression severity is mild. Results also show that consumer forgiveness mediates the effect of brand transgression severity, firm response, and consumer awareness on repurchase intentions. In this way, the study enables managers to determine whether or not an apology or apologia will be sufficient to solicit consumer forgiveness, using information about the levels of awareness of CSR among consumers.  相似文献   
13.
As soon as Zhu Yuanzhang, the founder of the Ming Dynasty, assumed the throne, he and his Confucian assistants imposed a system of clothing regulation on the court and society in order to create a hierarchical power structure. As an important aspect of Chinese civilization, the clothing system functioned to form a social hierarchy, to regulate people’s activities, to harmonize the relations among the people, and finally to make a stable society under the close control of the state. The state control in the Ming remained effective until the reigns of Hongzhi (1488–1506) and Zhengde (1506–1521), when commercialization released people’s consumption desires and economic dynamics and caused deregulation of the Ming clothing system, which eventually undermined the state authority.  相似文献   
14.
15.
福建晚更新世海侵问题探讨   总被引:1,自引:0,他引:1  
福建沿海在晚更新世大约距今90—80ka、70—60ka、44—39ka和34—20ka期间分别发生过4次海侵。最末一次海侵(距今34—20Ka)期间有过明显的海面下降波动,时间大约在距今28ka前后。  相似文献   
16.
The Paleogene sections of Kutch are the reference for the regional chronostratigraphic units of India. The ages of these dominantly shallow marine carbonates are mainly based on larger benthic foraminifera (LBF). The taxonomic revisions of the LBF and the progressively refined shallow benthic zonations (SBZ) have necessitated the present study on updating the stratigraphy of the area. The sedimentation in Kutch commenced with the deposition of volcaniclastics in terrestrial environments in the Paleocene. The marine transgression in SBZ 5/6 deposited finer clastics and carbonates, designated as Naredi Formation, in early Eocene. There is no evidence of marine Paleocene in Kutch. A major hiatus spanning SBZ 12 to SBZ 16 was followed by the development of a carbonate platform and deposition of Harudi Formation – Fulra Limestone during the Bartonian, SBZ 17. The hiatus corresponds to a widespread stratigraphic break in Pakistan and India to Australia, referred as the ‘Lutetian Gap.’ The Maniyara Fort Formation is assigned to SBZ 22 B and SBZ 23, and its age is revised to Chattian. Climate played a major role in building up of the Paleogene stratigraphic succession of Kutch, the carbonates formed during the warming intervals and the stratigraphic gaps were in the intervening cooling periods.  相似文献   
17.
We present a detailed luminescence chronology of the loess-palaeosol sequences in the Lower Volga region of Russia at the Leninsk site – an important palaeogeographic archive describing the climate and environmental conditions of regressive stages of the Caspian Sea. The chronology of these sediments has received very little attention compared to the under- and overlying marine deposits. The degree of bleaching was addressed by making use of the differential resetting rates of quartz and feldspar. Our results show that the quartz OSL and feldspar pIRIR50,290 signals were sufficiently bleached before deposition and uncertainties in bleaching have a negligible impact on the reliability of the luminescence ages. The combined quartz OSL and K-feldspar pIRIR50,290 chronology constrains the main stages of the Northern Caspian Lowland evolution during the Late Quaternary. During early MIS 5 (130–120 ka), the northern part of the Lower Volga was covered by a shallow brackish water estuary of the warm Late Khazarian Caspian Sea transgression. After ∼122 ka, the Volga incised the Northern Caspian Lowland surface following sea-level decrease and the start of subaerial conditions at Leninsk. Loess accumulation rate increased towards the end of MIS 5 and two palaeosols of presumably MIS 5с and MIS 5a age formed, exhibiting features evidencing a dry, cold climate, influenced by long seasonal flooding by the Volga River. Cryogenesis affecting the MIS 5a soil is a regional phenomenon and is dated to between ∼70 and 90 ka. The overlying thick Atelian loess unit formed during the cold periods of MIS 4 and MIS 3. Clear erosional features at the top of the Atelian loess are constrained by luminescence to ∼35 to ∼24 ka, allowing reconstruction of erosion of 150–200 cm of loess.  相似文献   
18.
The Ben Lewin film The Sessions has drawn attention again to the potential role for sexual surrogate partners and sex workers in enabling persons with disabilities and impairments to give expression to their sexual needs and desires. However, away from the big screen, the ethics of registered health practitioners in themselves engaging in such therapies are highly problematic. Difficult too is the role of such practitioners in being ‘the therapist’ responsible for enabling or brokering sexual contact between their patients and those offering such services for financial reward. In some jurisdictions, arrangements involving sexual surrogate therapy (especially where the therapist benefits from it financially) may not be lawful. Further, in spite of many assertions one way and the other, there are no data enabling evaluation of the success rates of the interventions of sexual surrogates or sex workers. Whether positive outcomes to such interactions are likely in most circumstances, given that the provision of services is predicated upon idealised attachments, is questionable. It is also unclear whether sexual surrogates’ adherence to an ethical code effectively ameliorates the potential for counter-therapeutic consequences from the commodification of intimacy, and it is far from straightforward to identify what steps should be taken by the referring health practitioner to select a suitable provider of sexual services to their patient or client, and then to monitor whether the arrangement is achieving its objectives.  相似文献   
19.
To trace environmental changes in water hydrology and salinity in the Late Glacial to Holocene of the Gulf of Gdańsk, a south‐eastern bay of the Baltic Sea within the maritime zone of Poland, the distribution of ostracod valves was studied in 20 sediment cores collected from both the shallow‐ and deep‐water zones (depth 10.9–67.5 m). The studied sediment sequences yielded ca. 3000 valves of 21 ostracod species, of which only five are known to live today in the Gulf, which has a present maximum depth of 118 m and water salinity up to 7–8‰. The majority of the studied sediment layers that contained ostracod valves corresponded to the period of the Late Glacial to Mid‐Holocene and was dominated by non‐marine species, of which the most common were Candona neglecta (present in 17 cores), Cytherissa lacustris (15 cores) and Candona candida (14 cores). By clustering classification five major ostracod assemblage types were recognised in the studied cores. Initial assemblage types dominated mostly by inhabitants of the profundal/sub‐littoral zones of modern oligo‐mesotrophic lakes (C. lacustris and C. neglecta) in some sediment sequences were replaced in stratigraphical order by the assemblages dominated by brackish‐water species (Cyprideis torosa or Cytheromorpha fuscata). The structure and species composition of the distinguished ostracod assemblage types as well as their successional transitions indicate that the studied sediments were deposited initially in the Late Glacial in freshwater lacustrine conditions, and subsequently, during the Holocene marine transgression, covered by marine sands. The present results confirm and consolidate inferences based on previously published data on ostracods from the western part of the Gulf of Gdańsk as well as on other biotic (molluscs, diatoms) and abiotic (seismoacoustic) indices from this area (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)  相似文献   
20.
Bataille’s work of the 1930s on the sacred has strong echoes of Walter Benjamin’s writing on space and messianic time. In bringing together Bataille’s theoretical and fictional writings, alongside key Benjamin texts, this article seeks to develop our understanding of a perversely grounded sacred.  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-23

京公网安备 11010802026262号