全文获取类型
收费全文 | 1068篇 |
免费 | 36篇 |
国内免费 | 10篇 |
专业分类
林业 | 104篇 |
农学 | 21篇 |
基础科学 | 24篇 |
23篇 | |
综合类 | 776篇 |
农作物 | 5篇 |
水产渔业 | 5篇 |
畜牧兽医 | 83篇 |
园艺 | 73篇 |
出版年
2024年 | 2篇 |
2023年 | 16篇 |
2022年 | 32篇 |
2021年 | 29篇 |
2020年 | 23篇 |
2019年 | 19篇 |
2018年 | 13篇 |
2017年 | 20篇 |
2016年 | 73篇 |
2015年 | 89篇 |
2014年 | 114篇 |
2013年 | 93篇 |
2012年 | 101篇 |
2011年 | 96篇 |
2010年 | 83篇 |
2009年 | 81篇 |
2008年 | 58篇 |
2007年 | 62篇 |
2006年 | 37篇 |
2005年 | 11篇 |
2004年 | 9篇 |
2003年 | 10篇 |
2002年 | 7篇 |
2001年 | 8篇 |
2000年 | 8篇 |
1999年 | 7篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1995年 | 4篇 |
1994年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1988年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有1114条查询结果,搜索用时 0 毫秒
1.
Assessing hygiene proficiency on organic and conventional pig farms regarding pork safety: A pilot study in Finland 总被引:1,自引:0,他引:1
K.-M. Siekkinen L. Nuotio J. Ranta R. Laukkanen S. Hellstrm H. Korkeala R. Maijala 《Livestock Science》2006,104(1-2):193-202
A key element in the EU Common Agricultural Policy (CAP) will be a single farm payment system that is linked to compliance with rules on, for instance hygiene standards. However, there are no recommended methods for assessing the hygiene proficiency of pig production farms. The present study was undertaken to develop a method for this purpose. A first implementation was done on pilot scale; with a set of both conventional and organic pig farms (N = 15). Fifty hygiene-related factors were selected, especially with reference to the possible proliferation of enteric pathogens Listeria monocytogenes, Yersinia enterocolitica and Yersinia pseudotuberculosis. The factors were allocated into 8 evaluation categories: (1) general production management, (2) animal density, (3) the outdoor area for pigs, (4) pest and pet animals, (5) general hygiene in the piggery, (6) pen hygiene, (7) feed production hygiene, and (8) feeding hygiene. A farm questionnaire and a supplementary on-site observation form were devised, and one arbitrary scale of hygiene points assigned for each factor. In addition to the mailed questionnaires, one person subsequently visited all the farms, perused the questionnaire with the owners and completed the observation form. The hygiene scores of the farms in each evaluation category were compared both without weighting and with weighting based on expert opinions. The method proved to be feasible and applicable to different types of production. 相似文献
2.
Bruno Belmonte Silveira Erick Candiota Souza Matheus Damasceno Nunes dos Santos Marcelo Lameiro Porciuncula Marcos da Silva Azevedo Claudia Acosta Duarte Amarílis Díaz de Carvalho Paulo de Souza Junior 《Anatomia, histologia, embryologia》2020,49(6):728-736
Criollo horse breeding is an important economic activity in South America. Because of their athletic performance, these animals tend to show great incidence of musculoskeletal disorders, many of them diagnosed by means of perineural blocks. However, incorrect interpretation of these blocks may be due to anatomical differences in nerve distribution. The objective of this study was to describe the innervation of the digit region of thoracic limbs in Criollo horses, in order to improve the interpretation of tests for claudication diagnosis based on nerve block. Thirty thoracic limbs from Criollo horses were dissected. It could be observed that in 90% of the limbs, dorsal branches of the palmar nerve originated proximally to the proximal sesamoid bone. In 93% of the cases, the palmar digital nerve and the dorsal branches communicated; in 87% of the cases, communication between branches of the dorsal branch was observed; and in 27% (8/30) of the limbs, the palmar metacarpal nerve and the dorsal branch presented communications. None of the specimens showed complete symmetry in the distribution of nerves in contralateral limbs. The high frequency of communication between the nerves may be a particularity of the Criollo breed that may interfere with the interpretation of perineural blocks. Based on the anatomical position, it may be inferred that divergent results in Criollo horses may occur when abaxial sesamoid nerve block is used. Palmar digital nerve block may be less influenced by these variations, provided it is performed as distal as possible from the ungular cartilage. 相似文献
3.
“中国野生动物之乡”命名活动 总被引:1,自引:0,他引:1
野生动物是自然生态系统的重要组成部分,在促进人与自然和谐发展、维护生态平衡等方面发挥着重要作用。为了加强野生动物资源的保护,调动野生动物栖息地地区公众保护鸟类的积极性,提高公众野生动物保护的意识,促进人口、资源、环境和经济的协调发展,中国野生动物保护协会自2004年起在全国组织开展了“中国野生动物之乡”命名活动,受到了社会各界的广泛欢迎。截止2011年8月,中国野生动物保护协会共在全国23个省(区、市)命名了50个“中国野生动物之乡”。作为野生动物保护宣传的新模式,“中国野生动物之乡”对于加大提高公众的保护意识,树立地方的生态品牌,调动社会各界的保护积极性起到了促进作用。 相似文献
4.
5.
6.
案例教学的理念在于"以学生为中心"。在整个教学活动组织过程中,以教学案例为媒介、以教师的有效策划和学生的积极参与为前提,全面提升学生应用理论创新性解决实际问题的能力。通过对公共管理类专业学生实施案例教学的效果进行分析,结果表明:案例教学受到缺乏职业经历的公共管理类学生的推崇,且其受欢迎的程度不因学生的成绩优劣、专业和学历而有显著差别;相对于传统的教学方法,案例教学更能增强学生识别问题、分析问题和解决问题的能力,还有助于学生深化对理论的理解和把握,也有利于学生增强合作意识、提高沟通技巧、克服心理障碍等。 相似文献
7.
The literature to date has mainly explored the impact on public mental health of green spaces around residential areas, large urban parks, family gardens, blue spaces, national parks, etc., while few studies have examined the association of Small Urban Green Spaces (SUGS) with public mental health. The role, function, and service radius of SUGS in urban people’s lives are quite different from those of general green spaces, and the relationship and mechanism linking general green spaces to mental health cannot be fully applied to small parks. This work was conducted to: 1) investigate the relationship between SUGS and mental health; 2) understand what factors affect mental health; 3) determine what kind of SUGS is more conducive to improving mental health. SUGS’ designs and physical characteristics were evaluated with the Natural Environment Scoring Tool (NEST) and user information for 10 SUGS (1–5 ha) in Shanghai in 2021 was collected via a questionnaire. We developed a multilevel model for exploring the factors affecting mental health from two aspects: the individual level and the park level. This study found that SUGS and mental health were positively associated. In addition to individual–level variables like income, marital status, social cohesion, and use frequency, park–level variables such as usability, aesthetics–natural features, and civilized environment are also conducive to improving mental health, while entertainment facilities in SUGS have a negative association with mental health. There was no evidence that visit frequency, stay time, social cohesion, or physical exercise act as a mediator between park features and mental health. This study provides empirical evidence for the positive correlation between SUGS and mental health and presents a means of promoting public mental health with efficient SUGS planning and management. 相似文献
8.
渔业公共资源管理既是一个国际性难题,也是我国渔业现代化和市场经济进程中,必须面对和妥善解决的渔业公共资源问题.本文重点分析了当前我国渔业公共资源存在的冲突矛盾,揭示其内在共性特征,总结了福建省渔业公共资源管理的经验和管理模式,结合渔业公共资源管理现状,提出了进一步完善我国渔业公共资源管理的制度设计思路和体制机制设计的原则,研究了适应我国社会主义市场经济条件下的渔业公共资源管理思路. 相似文献
9.
当今网络正深刻地影响着人们的学习和工作,与此同时也带来了“浅阅读”、“阅读危机”等现象。本文在此背景下阐述了提倡“亲近阅读”、“亲近图书馆”的价值和意义,以及图书馆在全民阅读活动中应扮演的角色。 相似文献
10.
农村公共物品供给是解决三农问题、提高农民生产生活水平的关键之一,根据公共物品供给的相关理论和科学发展观的要求,在农村公共物品供给中,充分发挥村民委员会作为自治组织的作用.对解决农村公共物品供给有一定的帮助。 相似文献