全文获取类型
收费全文 | 27071篇 |
免费 | 2957篇 |
国内免费 | 1978篇 |
专业分类
电工技术 | 2178篇 |
技术理论 | 1篇 |
综合类 | 2647篇 |
化学工业 | 3847篇 |
金属工艺 | 1738篇 |
机械仪表 | 1779篇 |
建筑科学 | 2550篇 |
矿业工程 | 728篇 |
能源动力 | 1046篇 |
轻工业 | 1721篇 |
水利工程 | 590篇 |
石油天然气 | 1145篇 |
武器工业 | 286篇 |
无线电 | 3184篇 |
一般工业技术 | 2928篇 |
冶金工业 | 1031篇 |
原子能技术 | 458篇 |
自动化技术 | 4149篇 |
出版年
2024年 | 150篇 |
2023年 | 425篇 |
2022年 | 805篇 |
2021年 | 1131篇 |
2020年 | 839篇 |
2019年 | 697篇 |
2018年 | 803篇 |
2017年 | 812篇 |
2016年 | 743篇 |
2015年 | 1080篇 |
2014年 | 1369篇 |
2013年 | 1495篇 |
2012年 | 1732篇 |
2011年 | 1768篇 |
2010年 | 1749篇 |
2009年 | 1554篇 |
2008年 | 1529篇 |
2007年 | 1440篇 |
2006年 | 1279篇 |
2005年 | 1047篇 |
2004年 | 1187篇 |
2003年 | 1634篇 |
2002年 | 2172篇 |
2001年 | 1862篇 |
2000年 | 872篇 |
1999年 | 540篇 |
1998年 | 258篇 |
1997年 | 205篇 |
1996年 | 194篇 |
1995年 | 146篇 |
1994年 | 103篇 |
1993年 | 80篇 |
1992年 | 79篇 |
1991年 | 42篇 |
1990年 | 41篇 |
1989年 | 35篇 |
1988年 | 26篇 |
1987年 | 15篇 |
1986年 | 8篇 |
1985年 | 12篇 |
1984年 | 7篇 |
1983年 | 6篇 |
1982年 | 8篇 |
1981年 | 2篇 |
1980年 | 7篇 |
1979年 | 6篇 |
1959年 | 9篇 |
1951年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 11 毫秒
1.
2.
3.
4.
陕南山地烟田不同植烟年限土壤养分的变化 总被引:1,自引:0,他引:1
为给陕南山地烟草生产布局及有针对性的施肥措施提供依据,分析了陕南山地烟田不同植烟年限(0~15年)与土壤养分含量的关系。结果表明:随着植烟年限延长,有机质线性下降,全氮和速效钾显著上升,有效磷先上升后下降;氯、有效铁、有效锰、有效硼和有效铜无显著变化或变化很小,有效锌则在第1年急剧下降,之后保持稳定,10年后再次显著下降。认为陕南山地烟区烟叶生产中应适当增加有机肥的施用而合理控制氮肥、磷肥和钾肥的施用,并要注意锌肥的补充。 相似文献
5.
【摘要】 目的 研究和探讨125I粒子条联合胆道支架植入治疗恶性梗阻性黄疸的临床疗效。方法 2011年6月—2013年9月收治恶性梗阻性黄疸患者40例。行胆道支架植入术治疗患者18例,为对照组;采用125I粒子条联合胆道支架植入患者22例,为观察组。两组均采用经皮肝穿刺胆道引流(PTCD)并胆道支架植入。结果 观察组与对照组的平均胆道开通时间分别为(8.7 ± 0.7)和(6.2 ± 0.4)个月,两组比较差异有统计学意义(P < 0.05)。观察组与对照组术后平均生存时间分别为(11.4 ± 0.8)和(8.7 ± 0.5)个月,生存时间的差异有统计学意义(P < 0.05)。术后近期疗效及并发症两组之间的比较无明显差异(P > 0.05),但是远期疗效有显著差异(P < 0.05)。结论 与对照组相比,观察组的术后生存时间及胆道开通时间明显延长,对于125I粒子条联合支架治疗恶性梗阻性黄疸值得进一步临床研究。
相似文献
相似文献
6.
Wenjia Jing Baoqiang Hou Jinxiao Wang Qiang Zhi Jianfeng Yang Bo Wang 《Journal of the American Ceramic Society》2022,105(5):3141-3146
Photocatalysts often show excellent performances on the basis of their surface state of exposed faces with high reactivity, but unfortunately surfaces of this type are usually concealed into the interior of crystals for their high surface energy. We report here a possibility that for fluorine-terminated surfaces of monoclinic ZrO2, these higher-energy surfaces could be retained and exposed. Urchin-like ZrO2 hollow microspheres (UZHS) composed of nanoribbons with exposed (010) facets are obtained through a fluoride mediately solvothermal method. We prove the stabilization effect of fluorine adsorption on (010) facets by density functional theory calculations. More interestingly, UZHS exhibit tunable photocatalytic selectivity in dye degradation. The fluorinated UZHS exhibit good performances both on decomposing Congo red (CR) and methylene blue, while the surface-modified UZHS by calcination only favor decomposition of CR. 相似文献
7.
Zhang Huawei Yang Zhi Wu Zhaoyu Hong Xiaoyu Li Zhong Xu Yulai Li Jun Ni Gaojin Xiao Xueshan 《Oxidation of Metals》2019,92(1-2):49-65
Oxidation of Metals - The isothermal oxidation behavior and oxide-scale evolution on a newly developed Ni–Fe-based superalloy were investigated. Three oxidation stages were generally... 相似文献
8.
Mingzhi Zhao Jianwei Cao Zhi Wang Guohua Li 《Journal of the European Ceramic Society》2019,39(7):2427-2435
The crystallization phenomena of spinel in CaO-MgO-Al2O3-SiO2-Fe2O3 glass have received much attention due to the particular role in preparation of glass-ceramic materials, which represent an effective option to manage hazardous waste. In this study, both preliminary spinel and secondary spinel were precipitated in the precursor glass. The formation of these spinel was meticulously assessed by a combination of X-ray diffractometry and scanning electron microscopy. The structure of the microenvironment in the precursor glass was characterized by Raman spectrums. These advanced techniques highlight the potential for one-step crystallization of the glass. The investigation, which focused on one-step crystallization, demonstrated the growth of pyroxene on spinel accompanying a migration of chromium. The results also show the microstructure of the obtained glass-ceramic was very dependent on the heat-treat temperature. This study not only unambiguously reveals the precipitation mechanisms of spinel but also provides more documentation for one-step crystallization in the glass-ceramics field. 相似文献
9.
10.
Hong Wei Li Li Ya‐Li Ma Ru‐Xue Liu Shuang‐Yan Meng Li‐Tong Niu Zhe Zhang Zhi‐Wang Yang 《火与材料》2019,43(7):868-879
Through the simple precipitation of palygorskite (PGS) by zinc borate (ZB) (to make PGS@ZB) and the decoration of PGS@ZB by dodecylamine (N), a novel organic‐inorganic@inorganic hybrid flame retardant of PGS@ZB‐N was prepared and was incorporated with ethylene vinyl acetate copolymer (EVA) to improve its flame retardance. The structure and morphology of PGS@ZB‐N were characterized by Fourier transform infrared (FTIR) spectroscopy, X‐ray diffraction (XRD), and scanning electron microscopy (SEM), and it was confirmed that the PGS@ZB‐N hybrid had been successfully prepared. The flame retardancy and burning behavior of EVA/PGS@ZB‐N/EG (EG = expandable graphite) composite were studied through thermogravimetric analysis (TGA), limiting oxygen index (LOI), UL‐94 (by the vertical burning test), and cone calorimeter test (CCT) characterizations. The prepared EVA/PGS@ZB‐N/EG composite obtained an LOI value of 41.2% with the addition of 30 wt% PGS@ZB‐N/EG. It was found that EVA/PGS@ZB‐N/EG was protected through a gas phase and condensed phase alternating synergistic effect mechanism. 相似文献