全文获取类型
收费全文 | 5597篇 |
免费 | 479篇 |
国内免费 | 271篇 |
专业分类
电工技术 | 147篇 |
综合类 | 324篇 |
化学工业 | 1709篇 |
金属工艺 | 295篇 |
机械仪表 | 186篇 |
建筑科学 | 478篇 |
矿业工程 | 678篇 |
能源动力 | 201篇 |
轻工业 | 187篇 |
水利工程 | 112篇 |
石油天然气 | 1052篇 |
武器工业 | 16篇 |
无线电 | 370篇 |
一般工业技术 | 294篇 |
冶金工业 | 189篇 |
原子能技术 | 8篇 |
自动化技术 | 101篇 |
出版年
2024年 | 11篇 |
2023年 | 54篇 |
2022年 | 115篇 |
2021年 | 144篇 |
2020年 | 166篇 |
2019年 | 134篇 |
2018年 | 119篇 |
2017年 | 149篇 |
2016年 | 211篇 |
2015年 | 175篇 |
2014年 | 308篇 |
2013年 | 298篇 |
2012年 | 422篇 |
2011年 | 460篇 |
2010年 | 326篇 |
2009年 | 332篇 |
2008年 | 297篇 |
2007年 | 362篇 |
2006年 | 387篇 |
2005年 | 319篇 |
2004年 | 269篇 |
2003年 | 222篇 |
2002年 | 201篇 |
2001年 | 188篇 |
2000年 | 133篇 |
1999年 | 126篇 |
1998年 | 101篇 |
1997年 | 86篇 |
1996年 | 66篇 |
1995年 | 55篇 |
1994年 | 23篇 |
1993年 | 21篇 |
1992年 | 16篇 |
1991年 | 7篇 |
1990年 | 9篇 |
1989年 | 6篇 |
1988年 | 6篇 |
1987年 | 11篇 |
1986年 | 3篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 4篇 |
1980年 | 1篇 |
1951年 | 1篇 |
排序方式: 共有6347条查询结果,搜索用时 31 毫秒
1.
Jiangyou Long Qingfa Peng Gaopan Chen Yuliang Zhang Xiaozhu Xie Guoshun Pan Xiaofeng Wang 《Ceramics International》2021,47(16):23134-23143
Femtosecond (fs) lasers have been proved to be reliable tools for high-precision and high-quality micromachining of ceramic materials. Nevertheless, fs laser processing using a single-mode beam with a Gaussian intensity distribution is difficult to obtain large-area flat and uniform processed surfaces. In this study, we utilize a customized diffractive optical element (DOE) to redistribute the laser pulse energy from Gaussian to square-shaped Flat-Top profile to realize centimeter-scale low-damage micromachining on single-crystal 4H–SiC substrates. We systematically investigated the effects of processing parameters on the changes in surface morphology and composition, and an optimal processing strategy was provided. Mechanisms of the formation of surface nanoparticles and the removal of surface micro-burrs were discussed. We also examined the distribution of subsurface defects caused by fs laser processing by removing a thin surface layer with a certain depth through chemical mechanical polishing (CMP). Our results show that laser-induced periodic surface structures (LIPSSs) covered by fine SiO2 nanoparticles form on the fs laser-processed areas. Under optimal parameters, the redeposition of SiO2 nanoparticles can be minimized, and the surface roughness Sa of processed areas reaches 120 ± 8 nm after the removal of a 10 μm thick surface layer. After the laser processing, micro-burrs on original surfaces are effectively removed, and thus the average profile roughness Rz of 2 mm long surface profiles decreases from 920 ± 120 nm to 286 ± 90 nm. No visible micro-pits can be found after removing ~1 μm thick surface layer from the laser-processed substrates. 相似文献
2.
为提高准东露天煤的成浆性能,利用宽沟煤、乌东煤、北山煤、黑山煤、红沙泉煤5种煤与准东露天煤进行了混合制浆实验,考察了各单种煤的成浆性能以及单种煤最高成浆浓度条件下混合制浆的煤浆性能。单一准东露天煤浆的成浆性研究表明:准东露天煤单独制浆时,在添加剂添加率3‰下,煤浆最高质量分数为47%,黏度650 mPa·s,但煤浆流动性和稳定性一般。与不同种煤混合制浆研究表明:准东露天煤与宽沟煤、黑山煤容易混合成浆,煤浆的浓度、流动性、稳定性均有明显提高;在准东露天煤与宽沟煤、黑山煤质量比5∶5时,煤浆质量分数可达57%,可满足水煤浆气化炉生产对煤浆的要求。 相似文献
3.
4.
Chia En Liu Wen Chieh Lan Hao Ting Yu Han Lin Yang I. Tseng Liu Hsiao Ping Hsu Chung Wen Lan 《International Journal of Applied Ceramic Technology》2020,17(1):146-152
Silicon kerf loss during wafer slicing and the broken quartz crucibles after silicon casting are two major solid wastes from photovoltaic (PV) industry. Especially, the recycle of kerf-loss silicon has become an urgent issue because near 100 000 t of solid wastes are generated every year. One of the most meaningful recycle routes of the kerf-loss silicon is to make silicon nitride crucibles to replace the quartz crucibles. In this study, we demonstrated how this is feasible through acid leaching refining, slip casting, and nitridation. The reaction-bonded silicon nitride (RBSN) crucibles after oxidation were found pure enough for silicon ingot growth. More importantly, they could be reused after ingot growth. With the present examples, the potential of using the kerf-loss silicon for fine ceramics is prominent. 相似文献
5.
6.
水煤浆管道输送摩阻损失研究 总被引:1,自引:1,他引:0
以十二醇醚为分散剂,进行了水煤浆管道输送实验研究,分析了分散剂浓度和煤浆浓度变化对煤浆摩阻损失的影响。煤浆管道输送数据分析及理论计算结果表明: 分散剂浓度越大,煤浆摩阻损失值越小; 水煤浆浓度越大,摩阻损失值越大。实验数据拟合结果表明有效黏度与平均切变率成线性关系,从理论上给出了煤浆摩阻损失的计算公式,计算值与实测值偏差不大于18%。 相似文献
7.
《中国有色金属学会会刊》2020,30(2):318-332
The hot cracking tendency of 7075 semi-solid alloy under different conditions was studied by critical diameter method. The experiment and simulation results show that the dendrite arms of the rod grow from the edge to the center. The smaller the diameter of the rod is, the more obvious the directional growth of dendrite is, and the greater the tendency of hot cracking is. Compared with ordinary melt, for semi-solid slurry, increasing mould temperature or decreasing pouring temperature can significantly decrease hot cracking tendency of 7075 alloy, decreasing hot cracking grade from 256 to 100 mm2. Furthermore, based on the RDG criterion, the effects of solidification conditions on the hot cracking tendency were discussed combined with simulation. At the same time, the application and development of RDG criterion were also researched. 相似文献
8.
9.
为了分析不同筛鼓缝宽对烟草基片浆料分布和其物理性能的影响,采用中浓压力筛对烟草基片浆料进行处理,观察烟草基片筛前浆料、筛后良浆和尾浆的纤维组分分布,并分别检测其基片松厚度、抗张指数等物理性能。结果表明,与筛前浆料相比,筛后良浆16目以下组分占比明显降低,200目以上组分占比明显增加,纤维分布更加集中、均匀;筛后浆料基片的柔软性能有较大改善,松厚度有所提高,但抗张指数、撕裂指数分别下降。与旧筛(0.55 mm缝宽)相比,增大压力筛筛缝宽度后,筛后良浆纤维组分并未出现明显变化,但筛后浆料基片松厚度相比筛前基片提高了4.55%,大于采用旧筛时基片松厚度的提高幅度1.33%。尾浆纤维组分主要集中在16目以下范围,占比可达50%。尾浆基片松厚度优于筛前和筛后基片,但伸长率和柔软性能较差,抗张指数及撕裂指数与筛后基片相近,但低于筛前基片。 相似文献
10.