全文获取类型
收费全文 | 859篇 |
免费 | 58篇 |
国内免费 | 16篇 |
专业分类
林业 | 128篇 |
农学 | 46篇 |
基础科学 | 27篇 |
21篇 | |
综合类 | 538篇 |
农作物 | 47篇 |
水产渔业 | 27篇 |
畜牧兽医 | 65篇 |
园艺 | 13篇 |
植物保护 | 21篇 |
出版年
2024年 | 5篇 |
2023年 | 7篇 |
2022年 | 21篇 |
2021年 | 24篇 |
2020年 | 28篇 |
2019年 | 34篇 |
2018年 | 22篇 |
2017年 | 18篇 |
2016年 | 41篇 |
2015年 | 33篇 |
2014年 | 44篇 |
2013年 | 57篇 |
2012年 | 81篇 |
2011年 | 66篇 |
2010年 | 70篇 |
2009年 | 66篇 |
2008年 | 51篇 |
2007年 | 56篇 |
2006年 | 51篇 |
2005年 | 43篇 |
2004年 | 30篇 |
2003年 | 15篇 |
2002年 | 23篇 |
2001年 | 12篇 |
2000年 | 5篇 |
1999年 | 10篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1996年 | 2篇 |
1995年 | 3篇 |
1993年 | 1篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1988年 | 2篇 |
1985年 | 1篇 |
排序方式: 共有933条查询结果,搜索用时 15 毫秒
71.
渔船碰撞事故责任分析中应注意的若干问题 总被引:1,自引:0,他引:1
随着海洋渔业的发展,渔船数量不断增多,船舶间碰撞事故的发生也就难以避免了。渔港监督部门作为主管机关在受理碰撞事故后,必然要进行责任分析,明确双方当事船舶的责任分摊。本文依据《1972年国际海上避碰规则》,提出了渔船碰撞事故责任分析中应注意的若干问题,以便有关部门参考。 相似文献
72.
郑远民 《湖南农业大学学报(自然科学版)》2002,(6)
随着市场经济全球化趋势的不断增强 ,现代商人法在国际商事仲裁中的运用越来越多。本文探讨和研究了现代商人法与国际仲裁法的关系问题 ,认为国际商事仲裁制度的发展推动了现代商人法作为一个相对独立的法律体系的形成 ,而国际商事仲裁制度也因为现代商人法的运用 ,从中获取了新的活力 ,并在这种新的法律体系或法律部门的影响下 ,逐渐趋向于完善。 相似文献
73.
Douglas Pearce 《Asia Pacific viewpoint》2001,42(1):75-84
The development of tourism in New Zealand during the 1990s reflects an intensification of many of the trends that were beginning to emerge in the latter part of the preceding decade, notably in terms of growth and change. The environment for tourism in the 1990s, however, was more fluid and challenging than it had been earlier. Growth continued, despite some major perturbations due to such factors as the Asian economic crisis. The industry proved its resilience and ability to adapt to changing conditions, institutional restructuring occurred and tourism in New Zealand generally became more diverse and complex. Increasing attention, but not much action, was directed at some of the externalities that the growth of tourism was generating. 相似文献
74.
Francis Leo Collins 《Asia Pacific viewpoint》2006,47(2):217-234
Abstract: In recent years, international education has become a source of considerable political, academic and media debate in New Zealand. This is nowhere more the case than with regards to Auckland, the New Zealand city that has hosted the greatest number of international students. This paper focuses on the media debates around international students in Auckland with particular emphasis on the representations of the largest group of international students, those who originate from countries within the North‐East Asian region. The media representations of these students have fixed a diverse group of individuals within a singular racial identity that is known by stereotypical economic, cultural and social characteristics. As a result, these representations have further problematised the interaction between international students and the host population in Auckland while simultaneously implicating a cohort of young New Zealand citizens and permanent residents who are of similar descent within the same discourses. This process of othering the Asian student, regardless of citizenship, has consequences not simply for the practice of exporting education in this city but also for the future of a multicultural Auckland and New Zealand. 相似文献
75.
Summary A series of international trials with the potato crop was conducted in eight countries representing widely differing environments. The purpose of the experiments was: (1) to develop a method for obtaining environmental indexes which measure productivity of diverse potato-growing areas, and (2) to construct performance models for individual genotypes based on the environmental indexes. Yield data of 32 genotypes obtained from a series of 13 experiments conducted in the eight countries in 1983 and 1984 were used in the study. The response pattern of the genotypes was studied by a multivariate analysis. Five genotypes were chosen as representatives for different response patterns to the environments and their data were used for calculating a series of independent indexes for each of the experimental sites based on principal component analysis. Performance models for each of the genotypes were constructed by stepwise regression analysis of yields of a genotype on the environmental indexes based on 1983 data. Yield data of 1984 experiments were used to verify the models. Satisfactory correspondence between observed and predicted yields was obtained for most of the genotypes. 相似文献
76.
By analyzing the achievements the TTX company and QI company gained on the basis of strategic alliance, this paper proves that strategic alliance is an effective mode of foreign market entry by Chinese enterprises, especially, private, small and medium enterprises, and they can actually promote their competence and acquire profit upon restricted resources by making an alliance with partners. This paper also discusses the problems exist in the alliance and the threat TTX faces, and put forward effective countermeasures. 相似文献
77.
LI Shi rong 《保鲜与加工》2001,(3):34-42
The paper deals with the concept of housing industrialisation, the importance of promoting industrialised housing in Chongqing. It analyses the current condition and the possible implementation approaches for developing industrialised housing in Chongqing. It addresses the aim, objectives, suggested organisation structure and the rules and responsibilities of each party in this project. The paper also mentions the importance for international cooperation and what overseas participants can offer for this project. 相似文献
78.
Summary Improved crop varieties developed at experimental stations are intended for release for production in farmers' fields which are not necessarily the test sites. Therefore, it is important to measure the inter-site transferability of the crop variety. This study was undertaken to establish a statistical measure of inter-site transferability of a variety. Data on grain yield from two sets of multi-locational trials on barley and four sets of the wheat trials conducted by the Cereal Program, International Center for Agricultural Research in the Dry Areas, Syria, were analyzed to evaluate the inter-site transferability of the varieties. Genotype × environment interaction was significant and experimental errors were heterogeneous in each set of trials. Correlations between the slope (of linear regression of variety mean on location mean) and variety mean were significant (P < 0.01) in all trials. Correlations between the developed inter-site transferability statistic and the variety mean were significant (P < 0.05) in only two trials. Correlations between mean yield and probability of the inter-site transferability statistic were insignificant in all trials. The inter-site transferability statistic and the associated probability of the transferability may be used to select varieties which are high yielding as well as transferable to a new environment. The strong association of slope with mean yield restricted the scope of varietal selection but the introduced statistic did not suffer from this drawback. 相似文献
79.
Juha I. Uitto 《Asia Pacific viewpoint》2005,46(2):143-151
Abstract: This article focuses on a significant paradigm shift in the approaches to biodiversity conservation in the developing countries that has affected important international organisations, including the Global Environment Facility (GEF). This paradigm shift marks a movement beyond protected areas to production landscapes. It is argued that one particular project, People, Land Management and Environmental Change (PLEC), developed under the leadership of Harold Brookfield has contributed significantly to the shift. The project was instrumental in introducing the term ‘agrodiversity’ that encompasses biological diversity as well as the management diversity found in smallholder agricultural systems at all levels. The article describes the evolution of PLEC into a major international collaborative project funded through the GEF. It highlights the project's main achievements and its influence on the policy‐making in the GEF relying on the findings of independent evaluations. 相似文献
80.
第8届国际雨水收集利用大会1997年4月21至25日在伊朗德黑兰召开,有40多个国家的1300余名代表参加,提交论274篇,出版论集4卷。会议内容丰富,有大会交流和10个专题报告,会后代表分6条路线对伊朗考察。我国到会19人,提交论12篇,考察西北冷凉半干旱区,下届国际雨水收集利用大会定于1999年在巴西召开。 相似文献