全文获取类型
收费全文 | 281篇 |
免费 | 9篇 |
学科分类
工业技术 | 290篇 |
出版年
2024年 | 1篇 |
2023年 | 4篇 |
2022年 | 4篇 |
2021年 | 14篇 |
2020年 | 12篇 |
2019年 | 10篇 |
2018年 | 14篇 |
2017年 | 9篇 |
2016年 | 16篇 |
2015年 | 8篇 |
2014年 | 15篇 |
2013年 | 19篇 |
2012年 | 16篇 |
2011年 | 28篇 |
2010年 | 16篇 |
2009年 | 14篇 |
2008年 | 11篇 |
2007年 | 7篇 |
2006年 | 10篇 |
2005年 | 6篇 |
2003年 | 3篇 |
2002年 | 2篇 |
2000年 | 3篇 |
1999年 | 7篇 |
1998年 | 7篇 |
1997年 | 3篇 |
1996年 | 4篇 |
1995年 | 3篇 |
1994年 | 3篇 |
1993年 | 7篇 |
1992年 | 1篇 |
1991年 | 3篇 |
1989年 | 2篇 |
1986年 | 4篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有290条查询结果,搜索用时 31 毫秒
1.
Anjan Biswas Sonmezoglu Abdullah Ekici Mehmet Alzahrani Abdullah Khamis Belic Milivoj R. 《Journal of Communications Technology and Electronics》2020,65(12):1384-1398
Journal of Communications Technology and Electronics - This paper implements mathematically rigorous extended trial function algorithm to address cubic–quartic optical solitons in... 相似文献
2.
Shank S. Kulkarni Kyoo Sil Choi Wenbin Kuang Nalini Menon Bernice Mills Ayoub Soulami Kevin Simmons 《International Journal of Hydrogen Energy》2021,46(36):19001-19022
The use of hydrogen as a fuel is increasing exponentially, and the most economical way to store and transport hydrogen for fuel use is as a high-pressure gas. Polymers are widely used for hydrogen distribution and storage systems because they are chemically inert towards hydrogen. However, when exposed to high-pressure hydrogen, some hydrogen diffuses through polymers and occupies the preexisting cavities inside the material. Upon depressurization, the hydrogen trapped inside polymer cavities can cause blistering or cracking by expanding these cavities. A continuum mechanics–based deformation model was deployed to predict the stress distribution and damage propagation while the polymer undergoes depressurization after high-pressure hydrogen exposure. The effects of cavity size, cavity location, and pressure inside the cavity on damage initiation and evolution inside the polymer were studied. The stress and damage evolution in the presence of multiple cavities was also studied, because interaction among cavities alters the damage and stress field. It was found that all these factors significantly change the stress state in the polymer, resulting in different paths for damage propagation. The effect of adding carbon black filler particles and plasticizer on the damage was also studied. It was found that damage tolerance of the polymer increases drastically with the addition of carbon black fillers, but decreases with the addition of the plasticizer. 相似文献
3.
4.
Effect of modified atmosphere packaging on the shelf-life of coated, whole and sliced mushrooms 总被引:2,自引:0,他引:2
Whole and sliced fresh mushrooms (Agaricus bisporus) were packaged with PVC wrap or two polyolefins (PD-941 and PD-961) films after coating with CaCl2 and chitosan. Package gas composition, color, weight loss and maturity were measured during storage at 12 °C and 80%RH. For PD-961, the highest in-package concentration occurred during the first day of storage regardless of treatments, while wrap and PD-941 showed varying degrees in-package concentration with different processes and coatings. The whiteness of whole mushrooms varied significantly with the type of coating, but not with the type of films. The extent of darkening was greater in coated whole mushrooms than in sliced ones. Weight loss occurred in all packages and varied from 3 (g/100 g) to about 7 (g/100 g) after 6 days of storage. Due to a lower permeability, PD-961 packages had the lowest weight loss. The type of packaging films significantly affected the maturity index, where PD-961 most effectively lowered maturity index for both whole and sliced mushrooms, thus extending the shelf-life. The type of coating did not appear to affect maturity index except for the wrap package where chitosan coating markedly lowered the maturity index of sliced mushrooms. 相似文献
5.
Young Sil Jeon Jing Lei Ji-Heung Kim 《Journal of Industrial and Engineering Chemistry》2008,14(6):726-731
This study examined the removal of some basic dyes, such as Methylene Blue, Malachite Green and Methyl Orange, using alginate or alginate/polyaspartate composite gel beads. The adsorption of dyes from aqueous solutions at 25 °C was examined using a batch sorption technique. The effects of CaCl2 and the dye concentration on the adsorption were examined. Type-S adsorption isotherms were obtained, which is characteristic of a weak solute–solid interaction. The ionic interaction between the dye molecule and gel matrix appears to be responsible for the efficient adsorption of cationic dyes in this system. These results suggest that an alginate/polyaspartate gel can be used as an effective sorbent for water pollutants such as dyes, and the immobilization of these organic contaminants in the hydrogels from wastewater can solve one of the most important environmental problems in the related industry. 相似文献
6.
7.
8.
The 1,3-specific lipase-catalyzed interesterified fats were distinguished from chemically catalyzed products by the fatty
acids in the 2-position. The fatty acid contents in the 2-position of the 1,3-lipase-catalyzed and the original triglycerides
were similar but different from that of chemically interesterified fat. Also, the saturated-to-unsaturated fatty acid ratio
in the 2-monoglycerides was lower for the 1,3-specific lipase-catalyzed interesterified fats than for the corresponding chemical
products. 相似文献
9.
V. V. Sil’vestrov A. V. Plastinin I. V. Yakovlev V. V. Pai 《Combustion, Explosion, and Shock Waves》1997,33(3):360-377
Results of a study of hypervelocity impact in model disperse-reinforced composites with an epoxy or aluminum matrix with metallic
(Al and Pb) or ceramic (SiO2) inclusions are reported. The goal of the present study is to find materials that possess a higher resistance to penetration
of a high-velocity projectile compared with materials of separate components. This resistance is characterized by the ratio
of the depth of a crater in a sufficiently thick target to the diameter of a spherical projectile. For two composites studied,
we show that in impact of a steel particle with a velocity ranging from3 to11km/sec, the crater depth is approximately one projectile diameter smaller than that for lead or aluminum targets.
Lavrent’ev Institute of Hydrodynamics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090. Translated from
Fizika Goreniya i Vzryva, Vol. 33, No. 3, pp. 139–151, May–June, 1997. 相似文献
10.
Experimental investigations were performed to see how the die exit geometry and the extrusion velocity influence on extrudate
swell and melt fracture for several polymer melts [low-density polyethylene, styrene-butadiene rubber (SBR) and SBR/HAF (carbon
black) compound]. Four different types of die exit geometry were considered; 0° (symmetric. usual capillary die), and 30°,
45° and 60° (asymmetric dies) were chosen for the die exit angle. Extrudate diameters were measured without draw-down under
isothermal condition. Polymer melts were extruded into an oil that has the same density and temperature as those of the extrudate.
Extrudate swells from dies with different diameters were correlated with volumetric flow rates. It was observed that the extrudate
swell increases with increasing volumetric flow rate and exhibits through a minimum value at about 45° die exit angle. As
to the fracture phenomena, it was observed that the critical shear for the onset of melt fracture increases with the increasing
die exit angle up to 45°. However, for 60° die exit angle, the onset of melt fracture is again similar to that of 0° exit
angle. 相似文献