全文获取类型
收费全文 | 7189篇 |
免费 | 408篇 |
国内免费 | 410篇 |
专业分类
林业 | 2918篇 |
农学 | 286篇 |
基础科学 | 200篇 |
527篇 | |
综合类 | 2761篇 |
农作物 | 341篇 |
水产渔业 | 33篇 |
畜牧兽医 | 307篇 |
园艺 | 379篇 |
植物保护 | 255篇 |
出版年
2024年 | 20篇 |
2023年 | 77篇 |
2022年 | 150篇 |
2021年 | 172篇 |
2020年 | 162篇 |
2019年 | 233篇 |
2018年 | 153篇 |
2017年 | 238篇 |
2016年 | 286篇 |
2015年 | 260篇 |
2014年 | 392篇 |
2013年 | 409篇 |
2012年 | 582篇 |
2011年 | 520篇 |
2010年 | 450篇 |
2009年 | 441篇 |
2008年 | 382篇 |
2007年 | 431篇 |
2006年 | 382篇 |
2005年 | 321篇 |
2004年 | 216篇 |
2003年 | 208篇 |
2002年 | 174篇 |
2001年 | 193篇 |
2000年 | 138篇 |
1999年 | 140篇 |
1998年 | 127篇 |
1997年 | 96篇 |
1996年 | 89篇 |
1995年 | 94篇 |
1994年 | 94篇 |
1993年 | 77篇 |
1992年 | 72篇 |
1991年 | 62篇 |
1990年 | 63篇 |
1989年 | 39篇 |
1988年 | 37篇 |
1987年 | 16篇 |
1986年 | 3篇 |
1985年 | 4篇 |
1983年 | 1篇 |
1978年 | 1篇 |
1963年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有8007条查询结果,搜索用时 31 毫秒
61.
Considering the character of slope resistant engineering invest benefit, in line with security and economy balmaced, combining initial investment and anticipated hazard loss, disaster resistant engineering should be satisfied with the criterion of minimum cost. Decision tree model is adopted as analyzing means, and risk decision-making of slope design is carried out. Project input-output radio adopting dynamic analysis can reflect project investment benefit more accurately. At last this paper analyzes some questions in process of slope resistant engineering with benefits enumerate. 相似文献
62.
针对国内汽车企业不具备整车齐全的三维CAD模型的实际情况,提出一种基于动态装配图热点和产品结构树结点双向驱动的备件数据可视化管理方案,在Delphi开发平台上将Action Script技术和ActiveX技术集成到可视化备件管理系统中。详细阐述了图热点驱动和树结点驱动的程序实现流程.给出了动态装配图、装配结构树和界面数据窗三者之间的联动关系,实现两种驱动的等效性。为了便于用递归算法遍历结构树,对复杂网状结构的零部件从属依赖关系进行规范化处理.使之成为树形结构。采用约束递归迭代,对一次性加载零部件的层数和范围进行约束,用统一的虚拟临时结点代替当前非叶子结点的子结点,实现整车装配关系结构树构造过程的优化。 相似文献
63.
64.
Three trickle irrigation schedules, two of which were scheduled according to soil water potential ( soil) (tensiometer method) and daily stem contraction (DSC) (dendrometer method) respectively and the other one was a schedule of restricted water supply, were applied to a mature peach orchard.The annual water application based on soil was greater than that based on DSC. However, tree growth, fruit size and leaf water potential (leaf) on the trees in the dendrometer scheduling plot did not differ from those in the tensiometer scheduling plot while the premature fruit drop and fruit bud initiation were greatly different. The restricted water supply treatment limited significantly both tree and fruit growth. In addition, the lower leaf was observed on the trees in this plot.Further study shows that use of the dendrometer method for scheduling irrigation satisfies the water needs of the plant and that the tensiometer method is less accurate.Abbreviations leaf
leaf water potential
- soil
soil water potential
- DSC
daily stem contraction
- LVDT
linear variable displacement transducer
- PET
potential evapotranspiration 相似文献
65.
Although there has been increasing research on the adoption of agroforestry technologies over the last decade, few such studies have assessed uptake over a long period and many are based on a single snapshot in time. Furthermore, most of these studies have mainly looked at non-adopters and adopters: only recently have social scientists considered testers. A further category of users neglected in adoption studies has been re-adopters of technologies. Studying this group provides an interesting and more nuanced understanding of adoption and re-adoption. Methodologically, most adoption studies use quantitative methods and fail to link their findings to wider socio-economic, political and institutional settings. This paper presents a study of the dynamics of improved tree fallow use by farmers in Siaya and Vihiga districts of western Kenya over a period of eight years. It uses both qualitative and quantitative data to critically discuss the motivations of adopters, testers/rejecters and re-adopters. The results show that the process of adoption is highly dynamic and variable with farmers planting improved fallows and discontinuing or re-adopting them due to a whole range of factors, of which soil fertility improvement is just one. These factors included incentives from projects, the tying of adoption to credit programmes, prestige, participation in seminars/tours and the availability of a seed market from projects promoting improved fallows. Farmers planting improved fallows for such reasons may be termed ‘pseudo-adopters’. There were significant differences in adoption between the two districts, with more farmers in Siaya planting improved fallows than in Vihiga. A majority of farmers in Vihiga (53%) who were given seed never planted improved fallows, even though they had been exposed to the technology. Some 40% of farmers in Siaya and 38% in Vihiga planted improved fallows but later rejected them. This has some important implications for research and development. For improved fallow technologies to be attractive to farmers, they must provide other tangible economic benefits besides soil fertility improvement. This presents a challenge to researchers who must better attune themselves to the needs and demands of farmers if they wish to see their research findings widely adopted. 相似文献
66.
自压式树状管网的两级优化设计模型与神经优化设计 总被引:4,自引:0,他引:4
建立了自压式树状管网两级优化设计模型,并用人工神经网络法实现树状管网非线性规划模型的快速求解。采用的人工神经网络技术的两级优化设计模型在适用范围、求解速度和获得最优解能力上,均优于单一的非线性规划模型和线性规划模型,是实现树状管网全局优化设计的一条新途径。 相似文献
67.
故障树分析法(FTA)是一种将系统故障形成的原因由总体到部分按倒立树形状逐级细化的分析方法,是一种对系统设计、故障分析和排除非常有效的方法。为此,应用故障树分析方法对联合收割机液压系统进行了分析,根据液压系统结构以及组件与系统之间的逻辑关系,绘制了系统的故障树,并通过结构函数表示了各种因素对系统状态的影响。 相似文献
68.
69.
LeeJongKyu ChoNamSeok LeeJongKyu ChoNamSeok 《华中农业大学学报》2004,23(1):113-117
棘胫小囊树皮甲虫(Coleopterla:Scolytidae)是一种与树木或新鲜木材兰染真菌相关的昆虫。本研究用不同种的松树制备的圆木诱捕、采集棘胫小囊树皮甲虫,并对其种类进行了比较。自4月至7月,从Pinus.rigida和Pinus.korniensis诱捕圆木上收集昆虫,共获得了10种树皮甲虫,其中Hylurgops interstitialis是P.koraiensi上最常见的甲虫,而Tomicus piniperda则在P.rigida上最常见。5月是H.interstitialis出现的高峰期,T.piniperda出现的高峰期是在4月。在6月上旬,新的成虫自蛹中孵化而出。为了研究树皮甲虫的种群与树木兰染真菌分离获得的频率的相关性,采用选择性培养基自成虫、卵/幼虫和树皮甲虫的虫道分离真菌。研究发现在越冬成虫和虫道上兰染真菌出现的频率分别是100%和94%,但在孵化的卵或刚孵出的幼虫上出现的频率相对较低。从兰染真菌分离出现的频率上看,收集的时间与树皮甲虫的种群没有显著的相关性。于4月20日可以首次观察到在虫道的下面出现变色现象,2周内,木材变色迅速增长,100%变色。对这些分离获得真菌进行鉴定,发现Leptographium spp出现频率高于Ophiostoma spp.。 相似文献
70.