全文获取类型
收费全文 | 10147篇 |
免费 | 1205篇 |
国内免费 | 615篇 |
专业分类
电工技术 | 164篇 |
综合类 | 761篇 |
化学工业 | 3539篇 |
金属工艺 | 697篇 |
机械仪表 | 315篇 |
建筑科学 | 1651篇 |
矿业工程 | 514篇 |
能源动力 | 281篇 |
轻工业 | 300篇 |
水利工程 | 481篇 |
石油天然气 | 683篇 |
武器工业 | 51篇 |
无线电 | 313篇 |
一般工业技术 | 1539篇 |
冶金工业 | 342篇 |
原子能技术 | 187篇 |
自动化技术 | 149篇 |
出版年
2024年 | 30篇 |
2023年 | 151篇 |
2022年 | 264篇 |
2021年 | 383篇 |
2020年 | 338篇 |
2019年 | 337篇 |
2018年 | 334篇 |
2017年 | 405篇 |
2016年 | 367篇 |
2015年 | 415篇 |
2014年 | 551篇 |
2013年 | 733篇 |
2012年 | 644篇 |
2011年 | 755篇 |
2010年 | 522篇 |
2009年 | 601篇 |
2008年 | 564篇 |
2007年 | 616篇 |
2006年 | 594篇 |
2005年 | 524篇 |
2004年 | 515篇 |
2003年 | 387篇 |
2002年 | 340篇 |
2001年 | 243篇 |
2000年 | 235篇 |
1999年 | 203篇 |
1998年 | 165篇 |
1997年 | 161篇 |
1996年 | 124篇 |
1995年 | 94篇 |
1994年 | 77篇 |
1993年 | 57篇 |
1992年 | 60篇 |
1991年 | 50篇 |
1990年 | 32篇 |
1989年 | 22篇 |
1988年 | 12篇 |
1987年 | 7篇 |
1986年 | 9篇 |
1985年 | 13篇 |
1984年 | 4篇 |
1983年 | 9篇 |
1982年 | 4篇 |
1981年 | 5篇 |
1980年 | 2篇 |
1979年 | 9篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
21.
22.
An efficient method for preparation of semiconductor quantum rod films for robust lasing in a cylindrical microcavity is reported. A capillary tube, serving as the laser cavity, is filled with a solution of nanocrystals and irradiated with a series of intense nanosecond laser pulses to produce a nanocrystal film on the capillary surface. The films exhibit intense room‐temperature lasing in whispering‐gallery modes that develop at the film–capillary interface as corroborated from the spacing detected for the lasing modes. Good lasing stability is observed at moderate pump powers. The method was applied successfully to several quantum‐rod samples of various sizes. 相似文献
23.
分别利用Ga2O3粉末和Ga2O3凝胶作为Ga源,采用NH3为N源,在950℃下,分别将两种反应物与流动的NH3反应20 min合成了GaN微晶。用X射线衍射(XRD)、扫描电子显微镜(SEM)、选择区电子衍射(SAED)对微晶进行结构、形貌的分析,特别是对两种不同途径合成GaN微晶的XRD进行了分析比较。结果表明,当Ga源温度为950℃时两种不同的合成途径均可得到六方纤锌矿结构的GaN单晶颗粒,在氮化温度为850℃和900℃时,利用Ga2O3粉末作为Ga源,仅有少量的Ga2O3转变为GaN;而采用Ga2O3凝胶作为Ga源,在相同的温度下,大部分凝胶经过高温氨化反应均可转化为GaN。 相似文献
24.
用两种方法——取代法和共聚法合成了一系列羟基镍铝交联蒙托石(GNiAl-CLM和NiAl-CLM),首次利用两种方法,交联前和交联后高温老化处理,对交联蒙托石的热稳定性进行改进。结果表明:取代法合成的羟基镍铝交联蒙托石具有均一的(001)面衍射,底面间距d(001)值均为1.8nm左右,而共聚法合成的羟基镍铝交联蒙托石出现两个(001)面衍射,d(001)值分别为1.8nm和1.55nm;高温处理后,热稳定性得到明显改进,热稳定性可高达700℃以上。 相似文献
25.
氢电弧等离子体法制备的纳米镍铈粒子的催化特性 总被引:3,自引:0,他引:3
利用氢电弧等离子法制备具有储氢特性纳米镍铈粒子,并在气相苯加氢反应中研究了其催化特性,发现其催化活性与储氢特性及表面层中NiCe合金存在有关,且具有高的选择性和热稳定性,这与纳米粒子独特的结构及铈的加入有关。 相似文献
26.
John Bensted 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1985,35(4):181-184
Characterisation of raw materials for Portland cement manufacture by use of the methylene blue adsorption method is discussed. The method is shown to be a simple, convenient ‘rule of thumb’ procedure. It provides a guide to the quantity and type of argillaceous minerals present in a given raw material sample. 相似文献
27.
钨基催化剂上钨的分散性和加氢脱氮性能 总被引:3,自引:0,他引:3
采用浸渍法和干混法制备了一系列负载钨的层柱分子筛催化剂 (W /Al-CLM)和对比用的负载钨的γ -Al2 O3催化剂 (W/γ -Al2 O3 )。研究了W/Al-CLM和W /γ -Al2 O3 两种催化剂表面上钨的分散情况 ,测定了W /Al-CLM和W /γ -Al2 O3 两种催化剂的吡啶加氢脱氮微反活性 ,比较了W /Al-CLM和W /γ -Al2 O3 两种催化剂的钨的分散性和加氢脱氮活性 ,分析了规律性。氨水处理可以溶去催化剂上所有晶相钨物种 ,改善了钨物种在载体表面上的分散性 ,催化剂上不溶于氨水并呈单层分散的表面钨物种是加氢脱氮活性中心。 相似文献
28.
Yoshihiro Iida Toshikatsu Tsuyuki Takao Mashima Takeo Takashima Kunito Okuyama 《亚洲传热研究》2002,31(1):28-41
This paper presents a series of experimental results on a passive augmentation technique of boiling heat transfer by supplying solid particles in liquid. A cylindrical heater 0.88 mm in diameter is placed in saturated water, in which a lot of mobile particles exist, and the nucleate and film boiling heat transfer characteristics are measured. Particle materials used were alumina, glass, and porous alumina, and the diameter ranged from 0.3 mm to 2.5 mm. Particles are fluidized by the occurrence of boiling without any additive power, and the heat transfer is augmented. The maximum augmentation ratio obtained in this experiment reaches about ten times the heat transfer coefficient obtained in liquid alone. The augmentation ratio is mainly affected by the particle material, diameter, and the height of the particle bed set at no boiling condition. The augmentation mechanism is discussed on the basis of the experimental results. © 2001 Scripta Technica, Heat Trans Asian Res, 31(1): 28–41, 2002 相似文献
29.
Nanocomposites based on poly(butylene terephthalate) (PBT) and an organoclay (Cloisite 30B) were prepared by melt blending using a twin‐screw extruder. Two kinds of PBTs, ie PBT‐A and PBT‐B, with different inherent viscosities (ηinh), were used for this study (ηinh of PBT‐A and PBT‐B were 0.74 and 1.48, respectively). Dispersion of the clay layers in the PBT nanocomposites was characterized by using X‐ray diffraction (XRD) and transmission electron microscopy (TEM). Tensile and dynamic mechanical properties and non‐isothermal crystallization temperatures of the nanocomposites were also examined. Nanocomposites based on the higher‐viscosity PBT (PBT‐B) showed a higher degree of exfoliation of the clay and a higher reinforcing effect when compared to the composites based on the lower‐viscosity PBT (PBT‐A). The clay nanolayers dispersed in PBT matrices lead to increases in the non‐isothermal crystallization temperatures of the PBTs, with such increases being more significant for the PBT‐B nanocomposites than for the PBT‐A nanoocomposites. Copyright © 2004 Society of Chemical Industry 相似文献
30.
Cypriano G da Trindade Neto Ana LP Fernandes Ana IB Santos Waldenice A Morais Marcos VM Navarro Tereza NC Dantas Mrcia R Pereira Jos LC Fonseca 《Polymer International》2005,54(4):659-666
Complexation of chitosan in aqueous solutions by low molecular weight electrolytes is one of the simplest methods for the preparation of aqueous chitosan dispersions. In this work, the influence of storage time, sulfate concentration, method of preparation and surfactant content on some properties of the resultant chitosan dispersions (turbidity, viscosity and zeta potential) was analyzed. Turbidimetry was adequate to monitor the formation of particles, while viscometry was suitable to monitor changes in the dispersing phase. An analysis of the properties of these systems, mainly in terms of particle–particle and macromolecule–macromolecule interactions was carried out. Copyright © 2004 Society of Chemical Industry 相似文献