全文获取类型
收费全文 | 641篇 |
免费 | 14篇 |
专业分类
655篇 |
出版年
2025年 | 1篇 |
2024年 | 4篇 |
2023年 | 5篇 |
2022年 | 13篇 |
2021年 | 8篇 |
2020年 | 17篇 |
2019年 | 18篇 |
2018年 | 24篇 |
2017年 | 18篇 |
2016年 | 22篇 |
2015年 | 15篇 |
2014年 | 13篇 |
2013年 | 45篇 |
2012年 | 30篇 |
2011年 | 60篇 |
2010年 | 31篇 |
2009年 | 47篇 |
2008年 | 47篇 |
2007年 | 65篇 |
2006年 | 57篇 |
2005年 | 40篇 |
2004年 | 10篇 |
2003年 | 15篇 |
2002年 | 17篇 |
2001年 | 12篇 |
2000年 | 7篇 |
1999年 | 6篇 |
1998年 | 1篇 |
1997年 | 3篇 |
1996年 | 1篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有655条查询结果,搜索用时 15 毫秒
21.
22.
The quick and accurate identification of post-earthquake rescue objects can minimize the casualties and property loss caused by earthquakes. With the rapid development of remote sensing technology, rescue objects can be identified through high-resolution remote sensing images. There are two main categories of approaches to identify rescue object through high-resolution images: automatic extraction by a computer and visual judgment by professionals. Although results can be obtained quickly by using automatic extraction, the accuracy of the results is unacceptably low. For visual judgment, the large demands for time and professionals restrict its wide practical application. In this study, we introduce crowdsourcing into the identification of post-earthquake rescue objects. First, we integrate the advantages of the computer and crowdsourcing, which means that the computer takes advantage of the speed of information processing, while crowdsourcing makes full use of human recognition capabilities. Second, we take visual judgment tasks out of the hands of professionals and entrust the tasks to workers in a crowdsourcing platform. Not only are the human resources infinite, but we can also improve the efficiency of identifying rescue objects. Third, we propose a crowdsourcing model that improves the quality of the results and saves human resources. Finally, experimental results demonstrate that our solution is feasible. 相似文献
23.
芥川龙之介一生共创作了148个短篇作品,涉猎女性形象的作品共76篇,其中女性形象色彩浓重38篇,涵盖知识女性、劳动女性、农妇甚至妓女等多个层面。这些形形色色的女性形象不仅如实地反映了作者的审美指向及其女性观,也浓缩了当时女性所处的社会地位和境遇。本文将其女性形象分为古典、现代与中国题材三大类,在分析芥川对女性所持态度的同时,考察作为大正时期知识分子的精英,其笔下诸多女性形象的文化内涵。 相似文献
24.
Lulu Zhang Jingjing Zang Yuhong Wang Liguang Sun 《Interdisciplinary science reviews : ISR》2019,44(3-4):387-401
ABSTRACTAlong with its modernization process, China has developed many interests in polar ecology and has connected the significance of the Antarctic and Arctic to its national interests. We present an in-depth analysis and assessment of the state of the art of China’s polar research from following points of view, mechanism of policy making on polar affairs, science diplomacy and polar governance, on-spot research expedition management, allocation of scientific funds, forming polar scientific team, especially on the management system of CHINARE. From an integrated perspective of social and natural sciences, we present a vision for future reform and development of polar affairs of China: to establish a macro and long term policy for the polar regions, to promote and establish a government-led, diversified polar scientific management system, to establish a reasonable and rule based evaluation system, to train, stabilize and expand polar scientific research teams, and to attract and encourage talents for polar science communication. 相似文献
25.
Percy Ngonyama 《African Historical Review》2017,49(2):72-101
Adopting the broad inter-disciplinary concept of “memory” and its construction in a public sphere, I examine some of the ways in which memories of Jabulani Nobleman Nxumalo, known as “Comrade Mzala” in liberation struggle circles, have been constructed and kept alive since his passing. A leading activist of the ANC, MK and the SACP, Mzala succumbed to an illness in a London hospital on February 22, 1991. A number of commemorative events and other activities, including grass-roots and branch-level initiatives, media releases, memorial lectures, colloquia and speeches and tributary statements, are analysed. Their tone, emotion, style and implicit objectives are explored. Notwithstanding the ubiquitous recognition of Mzala's liberation struggle credentials and intellectual prowess, there is no homogeneity in the manner he is remembered and celebrated; nor is there agreement in the reading of Mzala in a post-apartheid South Africa and its associated political and socio- economic context. Moreover, whilst it is predominantly organisations and individuals within the Tripartite Alliance who have been the main proponents of remembering, honouring and memorialising Mzala, there are others, outside of the Alliance and even antagonistic, who find inspiration in his radical world outlook, work and persona; and often use their memory of Mzala to critique the current political and economic conjuncture. 相似文献
26.
Andreas Wesener 《International Journal of Heritage Studies》2017,23(2):141-155
The paper discusses notions and experiences of authenticity of place in relation to intangible cultural heritage. Drawing on qualitative informant interviews with representatives of traditional and new businesses in the Jewellery Quarter in Birmingham (UK), it analyses authenticity of place with regard to three key dimensions: the experience of origins, the experience of continuity and the experience of potentiality and actuality. Findings suggest that intangible cultural heritage activates and facilitates experiences of authenticity, often related to people’s individual identity constructs and associated benefits or detriments. Some heritage concepts have evolved from their narrowly defined historic context and inform experiences of authenticity in the present. 相似文献
27.
Marta Portillo Terry B. Ball Michael Wallace Charlene Murphy Sebastián Pérez-Díaz Mónica Ruiz-Alonso 《Environmental Archaeology》2020,25(2):246-256
ABSTRACTMorphometric analysis offers an alternative or augmentation to traditional archaeobotanical methods to address differences within and between plant species and their remains, refining and enhancing taxonomic resolution. Morphometrics, the measurement of size and shape, and the multivariate statistical analysis of generated quantitative variables, have long played a major role in biological research, including plant taxonomy and systematics, although its application in archaeobotany is relatively recent. Over the last few decades, there has been an increasing interest in the use of morphometrics for analysing a varied range of archaeological plant materials (mainly seeds, pollen, phytoliths, and starch grains). In particular, morphometrics have contributed to the study of the domestication and spread of many cereals world-wide, as well as that of other taxa including legumes, underground storage organs (USO), and fruits (such as olives, grapes, and dates). This paper reviews current methodologies, recent applications, and advances in the use of morphometrics in archaeobotanical research, discusses its role in exploring major research questions, and suggests possible future directions for its use. 相似文献
28.
Jun-Hua Lin 《Gender, place and culture : a journal of feminist geography》2018,25(1):118-133
As social and cultural contexts change and globalization spreads, the number of transnational-marriage migrants mainly from Southeast Asia has increased in Taiwan. Using institutional ethnography, this article investigates the roles of local non-governmental organizations (NGOs) and projects aimed at helping foreign spouses to adapt to their new life. I mainly elaborate that NGOs emerge as important actors in assisting and empowering transnational spouses to ‘become locals’. In empowerment projects, foreign spouses are given a voice to elaborate themselves. However, this article elaborates that these projects are a scheme of education to shape each such migrant into a proper ‘Taiwanese wife/mother/daughter-in-law’. Also, these projects particularly promote ‘exoticism’ of migrants and become key sources of how local people understand the images of ‘foreign spouses’. As a result, though NGOs play positive roles in empowering foreign spouses, we need to be aware that NGOs’ efforts may ironically become a mechanism to strengthen transnational spouses’ gender roles and cultural stereotypes. 相似文献
29.
The original fineness of coins is very important information that can help us to understand the commercial situation in a wide historical context. This paper deals with a comparison of analytical methods suitable for the evaluation of the actual and original fineness of coins based on a detailed case study of a medieval coin sample. Both non‐destructive (i.e., scanning electron microscopy/energy‐dispersive X‐ray spectroscopy, X‐ray fluorescence, atomic force microscopy and hydrostatic weighing) and destructive (i.e., inductively coupled plasma – mass spectrometry and the Volhard titration method) techniques were used. The original fineness can be also deduced from knowledge of the internal structure of the coin (limited miscibility of copper and silver). A new analytical method based on a combination of a micrograph of the metallographic cross‐section with consequent image analysis was developed for determination of the original fineness. The proposed approach is relatively simple and provides reliable values. Sample heterogeneity and its impact on the determination of fineness are also discussed. 相似文献
30.