全文获取类型
收费全文 | 11610篇 |
免费 | 1015篇 |
国内免费 | 505篇 |
专业分类
电工技术 | 887篇 |
技术理论 | 2篇 |
综合类 | 750篇 |
化学工业 | 1941篇 |
金属工艺 | 652篇 |
机械仪表 | 705篇 |
建筑科学 | 746篇 |
矿业工程 | 313篇 |
能源动力 | 305篇 |
轻工业 | 710篇 |
水利工程 | 229篇 |
石油天然气 | 636篇 |
武器工业 | 105篇 |
无线电 | 1364篇 |
一般工业技术 | 1475篇 |
冶金工业 | 618篇 |
原子能技术 | 183篇 |
自动化技术 | 1509篇 |
出版年
2024年 | 32篇 |
2023年 | 212篇 |
2022年 | 277篇 |
2021年 | 498篇 |
2020年 | 390篇 |
2019年 | 298篇 |
2018年 | 353篇 |
2017年 | 391篇 |
2016年 | 349篇 |
2015年 | 462篇 |
2014年 | 595篇 |
2013年 | 653篇 |
2012年 | 689篇 |
2011年 | 829篇 |
2010年 | 651篇 |
2009年 | 644篇 |
2008年 | 697篇 |
2007年 | 688篇 |
2006年 | 645篇 |
2005年 | 565篇 |
2004年 | 395篇 |
2003年 | 395篇 |
2002年 | 460篇 |
2001年 | 372篇 |
2000年 | 260篇 |
1999年 | 222篇 |
1998年 | 189篇 |
1997年 | 169篇 |
1996年 | 168篇 |
1995年 | 137篇 |
1994年 | 125篇 |
1993年 | 64篇 |
1992年 | 66篇 |
1991年 | 36篇 |
1990年 | 22篇 |
1989年 | 35篇 |
1988年 | 22篇 |
1987年 | 18篇 |
1986年 | 9篇 |
1985年 | 9篇 |
1984年 | 7篇 |
1983年 | 5篇 |
1982年 | 9篇 |
1980年 | 2篇 |
1976年 | 6篇 |
1975年 | 2篇 |
1967年 | 2篇 |
1963年 | 1篇 |
1961年 | 1篇 |
1957年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
101.
教育信息化是我国信息化建设的重要组成部分,推进教育行业的信息化已是大势所趋。如何合理、高效地进行信息化校园建设是目前校园信息化建设过程中迫切需要解决的问题。作者多年来积极参与学校的信息化建设,对信息化校园建设深入的进行了思考,提出了信息化校园建设内容、建设过程中存在的困难与顾虑及建设思路。 相似文献
102.
The paper proposes a new approach to find semantic meanings in visual object class structure, in line with the Gestalt laws
of proximity. Micro level semantic structures are formed by line segments (arcs also approximated into line segments based
on pixel deviation threshold) which are in close proximity. These structures are hierarchically combined till a semantic label
can be assigned. The algorithm extracts semantic groups, their inter-relations and represents these using a graph. Invariant
geometrical properties of the groups and relations are used as vertex and edge labels. A graph model captures the inter class
variability by analyzing the repetitiveness of structures and relations and uses it as a weighting factor for classification.
The algorithm has been tested on a standard benchmark database and compared with existing approaches. 相似文献
104.
105.
106.
针对目前网络地理信息系统体系结构难以实现Internet环境下的异构空间信息的互操作问题,深入分析其主要原因,在对现有网络地理信息系统的三层体系结构进行深入分析的基础上,提出一种基于Web services的网络地理信息系统体系结构(Web-based geographical information services visualization architecture,WebGISVisA).WebGISVisA体系结构通过Web services对各个地理信息系统组件进行包装,实现各个组件的跨平台操作,从技术上使得客户端和服务端达到了负载平衡,完成了WebGIS三维的虚拟现实,实现了在Internet下空间数据互操作和跨平台的功能,最大限度地达到数据共享. 相似文献
107.
Chemical looping gasification (CLG) of Ningdong coal by using Fe2O3 as the oxygen carriers (OCs) was studied, and the gasification characteristics were obtained. A computation fluid dynamics (CFD) model based on Eulerian‐-Lagrangian multiphase framework was established, and a numerical simulation the coal chemical looping gasification processes in fuel reactor (FR) was investigated. In addition, the heterogeneous reactions, homogeneous reactions and Fe2O3 oxygen carriers' reduction reactions were considered in the gasification process. The characteristics of gas flow and gasification in the FR were analyzed and it was found that the experiment results were consistent with the simulation values. The results show that when the O/C mole rate was 0.5:1, the gasification temperature was 900 ℃ and the water vapor volume flow rate was 2.2 ml·min-1, the mole fraction of syngas reached a maximum value of the experimental result and simulation value were 71.5% and 70.2%, respectively. When the O/C mole rate was 0.5:1, the gasification temperature was 900 ℃, and the water vapor volume flow was 1.8 ml·min-1; the gasification efficiency reached the maximum value was 62.2%, and the maximum carbon conversion rate was 84.0%. 相似文献
108.
109.
Shuzhen Liu Guoyan An Qing Cao Tong Li Xinyu Jia Lei Lei 《International journal of molecular sciences》2021,22(11)
Increasing numbers of miRNAs have been observed as oncogenes or tumor suppressors in colorectal cancer (CRC). It was recently reported that hsa-miR-106b-5p (miR-106b) promoted CRC cell migration and invasion. However, there were also studies showing contradictory results. Therefore, in the present study, we further explore the role of miR-106b and its downstream networks in the carcinogenesis of CRC. We observed that the expression of miR-106b is significantly increased in Pan-Cancer and CRC tissues compared with normal tissues from The Cancer Genome Atlas (TCGA) database. Furthermore, we used Transwell, Cell Counting Kit-8, and colony formation assays to clarify that miR-106b promotes the migratory, invasive, and proliferative abilities of CRC cells. For the first time, we systematically screened the target mRNAs and lncRNAs of miR-106b using TCGA database and the bioinformatics algorithms. Dual-luciferase reporter assay confirmed that NR2F2-AS1 and PLEKHO2 are the direct targets of miR-106b. Furthermore, NR2F2-AS1 acts as a competing endogenous RNA (ceRNA) to regulate PLEKHO2 expression by sponging miR-106b. The results of Gene set enrichment analysis (GSEA) and Western blot indicated that they play important roles in CRC progression by regulating MAPK pathway. Thus, miR-106b/NR2F2-AS1/PLEKHO2/MAPK signaling axis may suggest the potential usage in CRC treatment. 相似文献
110.
Shishan Xue Guanfei Liu Jingjuan Lai Peng An Yang Liu Yuanpeng Wu Yu Wang Zhiyong Ye Qiao Tang Hongwei Zhou 《大分子材料与工程》2021,306(11):2100415
Self-healing hydrogels often possess poor mechanical properties which largely limits their applications in many fields. In this work, boron nitride nanosheets are introduced into a network of the poly(vinyl alcohol)/borax (PVA/borax) hydrogels to enhance the mechanical properties of the hydrogel without compromising the self-healing abilities. The obtained hydrogels exhibit excellent mechanical properties with a tensile strength of 0.410 ± 0.007 MPa, an elongation at break of 1712%, a Young's Modulus of 0.860 ± 0.023 MPa, and a toughness of 3.860 ± 0.075 MJ m−3. In addition, the self-healing efficiency of the hydrogels is higher than 90% within 10 min at room temperature. Benefiting from the excellent self-healing properties, the shapeability of the hydrogel fragments is observed using different molds. In addition, the hydrogels display rapid pH-driven shape memory effects and can recover to their original shape within 260 s. Overall, this work provides a new approach to hydrogels with integrated excellent mechanical properties, self-healing abilities, and rapid pH-driven shape memory effects. 相似文献