全文获取类型
收费全文 | 975篇 |
免费 | 58篇 |
国内免费 | 31篇 |
专业分类
电工技术 | 61篇 |
综合类 | 100篇 |
化学工业 | 125篇 |
金属工艺 | 40篇 |
机械仪表 | 34篇 |
建筑科学 | 103篇 |
矿业工程 | 32篇 |
能源动力 | 33篇 |
轻工业 | 204篇 |
水利工程 | 37篇 |
石油天然气 | 45篇 |
武器工业 | 5篇 |
无线电 | 29篇 |
一般工业技术 | 79篇 |
冶金工业 | 68篇 |
原子能技术 | 10篇 |
自动化技术 | 59篇 |
出版年
2023年 | 8篇 |
2022年 | 21篇 |
2021年 | 19篇 |
2020年 | 13篇 |
2019年 | 15篇 |
2018年 | 21篇 |
2017年 | 24篇 |
2016年 | 36篇 |
2015年 | 25篇 |
2014年 | 46篇 |
2013年 | 38篇 |
2012年 | 69篇 |
2011年 | 78篇 |
2010年 | 56篇 |
2009年 | 60篇 |
2008年 | 46篇 |
2007年 | 69篇 |
2006年 | 61篇 |
2005年 | 53篇 |
2004年 | 56篇 |
2003年 | 35篇 |
2002年 | 34篇 |
2001年 | 34篇 |
2000年 | 26篇 |
1999年 | 19篇 |
1998年 | 19篇 |
1997年 | 12篇 |
1996年 | 7篇 |
1995年 | 11篇 |
1994年 | 7篇 |
1993年 | 15篇 |
1992年 | 6篇 |
1991年 | 9篇 |
1990年 | 3篇 |
1989年 | 6篇 |
1988年 | 1篇 |
1987年 | 4篇 |
1985年 | 1篇 |
1984年 | 1篇 |
排序方式: 共有1064条查询结果,搜索用时 15 毫秒
1.
2.
Emaeyak N Ukpong C S Odoemena G Ekpo 《Journal of the science of food and agriculture》1994,64(4):449-453
Aspergillus niger (strain UUF9202) significantly reduced the dormancy period and boosted aggregate germination percentage (AGP) in seeds of Tetrapleura tetraptera. A net reduction in mean germination time (MGT) to 12 days and an increase from 0 to 42% AGP were obtained in 32 days. The optimal spore inoculum of the fungus was 8.5 × 10≥10 ml?1 per 100 seeds in 96 h pregermination incubation. The potential of some physical factors in combination with this fungal concentration in enhancing AGP was evaluated. The treatments were as follows: (i) hot water scarification at 30°C, 50°C, 80°C and 100°C plus A niger; and (ii) nicking by decoating at either the micropylar or chalazal ends plus A niger. Micropylar scarification plus A niger gave the highest AGP (94%) followed by chalazal scarification plus A niger (86%) and hot water dip at 80°C + A niger (82%). The control seeds which were soaked in presterilised (by autoclaving at 121°C for 15 min) A niger spore suspension at 30°C gave zero germination. 相似文献
3.
Results from long-term field experiments in south-western Australia are presented in the form of relationships between yield, expressed as a percentage of the maximum yield, and soil test for phosphorus (P) values. Maximum yields were not always indicated by well defined yield plateaux. Different methods have been used to estimate the maximum yield value which is used to calculate yield as a percentage of the maximum yield so as to remove interseasonal variation. For all of these methods and for the same site, the same P fertilizer (superphosphate), and the same plant species, the relationship between yield and soil test P differed for different years. Consequently fertilizer recommendations based on the assumption that this relationship is constant are likely to be incorrect. We therefore question the validity of the common practice in soil testing programmes of using percentage yield values to remove interseasonal variation. 相似文献
4.
本文对模拟的含酚废水,采用新型技术对乳状液膜法脱酚进行了进一步的探讨。对所采用的制乳设备———撞击流-旋转填料床对制乳率、提取设备———旋转填料床对脱酚率、破乳设备———无机微孔膜法破乳的重要参数(如透过压方式、膜孔径等对膜通量和破乳率的影响)进行了研究。并且讨论了破乳后的油相回用情况。实验结果表明:撞击流-旋转填料床的制乳效率可达99.90 %以上,脱酚率可达99%左右,且瞬间完成;膜孔径越小,破乳率越高,膜通量越小;外压内抽方式的破乳效果优于单外压方式的破乳效果。对于粒径为5~2 5 μm乳液,用膜孔径为2 .0 μm的SiC微孔膜,在外压为6 0kPa、内负压为30kPa的外压内抽破乳方式下破乳,破乳率可达96 .4 % ,膜通量可达90 0L·(m2 ·h) -1。 相似文献
5.
6.
7.
Poly(acrylamide‐co‐itaconic acid) (PAAmIA) and poly(acrylic acid‐co‐itaconic acid) (PAAIA) copolymeric hydrogels were prepared with different compositions via free‐radical polymerization. Ethylene glycol dimethacrylate (EGDMA) was used as an original crosslinker for these monomers. Gelation percentages of the monomers were studied in detail and it was found that addition of IA into the monomer mixture decreased the gelation percentage. The variation in swelling values (%) with time, temperature, and pH was determined for all hydrogels. PAA, which is the most swollen hydrogel, has the swelling percentage value of 2000% at pH = 7.4, 37°C. Swelling behaviors were explained with detailed SEM micrographs, which show the morphologic differences between dry and swollen hydrogels. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 5994–5999, 2006 相似文献
8.
高温后再生混凝土的残余抗折强度 总被引:1,自引:0,他引:1
完成了150块不同再生粗骨料取代率(0%、30%、50%、70%、100%)下再生混凝土棱柱体试块在20℃~800℃下的高温试验。通过对高温中和高温后试验现象与数据的对比,研究了高温后再生混凝土的残余抗折强度,分析了高温后再生混凝土的残余抗折强度与经历温度之间的相互关系与变化特点,同时与已有高温后再生混凝土的残余抗压强度进行了对比分析。最后,提出了基于试验统计的再生混凝土残余抗折强度与经历温度之间的建议公式。结果表明:随经历温度的升高,高温后再生混凝土的残余抗折强度整体上逐渐下降;与残余抗压强度相比,再生粗骨料取代率对高温后再生混凝土的残余抗折强度影响不明显。 相似文献
9.
Model test of the cutting properties of a shearer drum 总被引:1,自引:1,他引:0
According to similarity theory, we carded out a dimensional analysis of the shearer drum correlation parameters and built similarity criteria. Based on these, similarity models of shearer drums were developed. Simultaneously, based on an estab-lished cutting testbed of the coal and rock, cutting tests of different pick arrangements of the drum models were carried out, where the compressive strength of the analogous cutting material was 2.48 MPa and the drum rotary speed 67.5 r/min. The variance, the mean values, maxima and mean maxima of the torque load were analyzed for different type drum models. Moreover, the relation-ships between the type of pick arrangements and the cutting lump coal percentage were studied. The results indicate that the load fluctuation of the sequence drum is larger than that of the punnett square drum in the cutting process and the lump coal percentage and economic benefits of the sequence drum are inferior to the punnett square drum. We conclude that the punnett square drum is superior to the sequence drum. 相似文献
10.
双氧水氧化橡实淀粉的实验研究 总被引:1,自引:1,他引:0
以双氧水为氧化剂,Cu2+为催化剂制备橡实氧化淀粉,考察pH值、氧化剂用量、催化剂用量、反应温度及反应时间对橡实氧化淀粉的羰基和羧基质量分数的影响.结果表明,最佳反应条件为:反应温度45℃,反应时间3 h,pH=8,H2O2用量为20%(相对于淀粉干重质量,下同),在此条件下,当催化剂用量为0.052 4%(相对于淀粉干重的质量)时,制得羧基质量分数为0.914 0%的橡实氧化淀粉;在催化剂用量为0.124 4%时,制得羰基质量分数为0.918 3%的橡实氧化淀粉. 相似文献