全文获取类型
收费全文 | 831篇 |
免费 | 15篇 |
国内免费 | 7篇 |
专业分类
电工技术 | 5篇 |
综合类 | 3篇 |
化学工业 | 140篇 |
金属工艺 | 27篇 |
机械仪表 | 14篇 |
建筑科学 | 10篇 |
能源动力 | 39篇 |
轻工业 | 89篇 |
水利工程 | 5篇 |
石油天然气 | 33篇 |
无线电 | 58篇 |
一般工业技术 | 132篇 |
冶金工业 | 226篇 |
原子能技术 | 7篇 |
自动化技术 | 65篇 |
出版年
2023年 | 13篇 |
2022年 | 12篇 |
2021年 | 18篇 |
2020年 | 17篇 |
2019年 | 23篇 |
2018年 | 21篇 |
2017年 | 20篇 |
2016年 | 35篇 |
2015年 | 22篇 |
2014年 | 47篇 |
2013年 | 74篇 |
2012年 | 47篇 |
2011年 | 48篇 |
2010年 | 36篇 |
2009年 | 34篇 |
2008年 | 17篇 |
2007年 | 21篇 |
2006年 | 10篇 |
2005年 | 8篇 |
2004年 | 16篇 |
2003年 | 7篇 |
2002年 | 6篇 |
2001年 | 10篇 |
2000年 | 7篇 |
1999年 | 18篇 |
1998年 | 72篇 |
1997年 | 45篇 |
1996年 | 20篇 |
1995年 | 18篇 |
1994年 | 18篇 |
1993年 | 14篇 |
1992年 | 5篇 |
1991年 | 1篇 |
1990年 | 6篇 |
1989年 | 5篇 |
1988年 | 6篇 |
1987年 | 5篇 |
1986年 | 5篇 |
1985年 | 4篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 4篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1977年 | 4篇 |
1976年 | 24篇 |
1974年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有853条查询结果,搜索用时 0 毫秒
61.
Dual crosslinked carboxymethyl sago pulp/pectin hydrogel beads as potential carrier for colon‐targeted drug delivery 下载免费PDF全文
Hui Li Tan Li Shan Tan Yeon Yin Wong Saravanan Muniyandy Kamaruddin Hashim Janarthanan Pushpamalar 《应用聚合物科学杂志》2016,133(19)
Carboxymethyl sago pulp (CMSP)/pectin hydrogel beads were synthesized by calcium crosslinking and further crosslinked by electron beam irradiation to form drug carrier for colon‐targeted drug. Sphere‐shaped CMSP/pectin 15%/5% hydrogel beads is able to stay intact for 24 h in swelling medium at pH 7.4. It shows pH‐sensitive behavior as the swelling degree increases as pH increases. Fourier transform infrared spectroscopy analysis confirmed the absence of chemical interaction between hydrogel beads and diclofenac sodium. Differential scanning calorimetric and X‐ray diffraction studies indicate the amorphous nature of entrapped diclofenac sodium. The drug encapsulation efficiency is up to about 50%. Less than 9% of drug has been released at pH 1.2 and the hydrogel beads sustain the drug release at pH 7.4 over 30 h. This shows the potential of CMSP/pectin hydrogel beads as carrier for colon‐targeted drug. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43416. 相似文献
62.
63.
R. Hashim O. Sulaiman R.N. Kumar P.F. Tamyez R.J. Murphy Z. Ali 《Journal of Materials Processing Technology》2009,209(2):635-640
Medium density fiberboard (MDF) is one of the widely used wood-based panels to manufacture building components such as furniture units for interior applications. Although MDF is an excellent product it is prone to fire hazard which should be enhanced using flame retardants during its manufacture. Properties of the flame retardant urea formaldehyde (UF) MDF made using a dry process from rubberwood fibers were investigated. Flame retardant chemicals that were evaluated include sodium aluminate, zinc borate and aluminum trihydrate, which were incorporated with rubberwood fibers to manufacture experimental MDF. Four concentration levels, 10%, 15%, 20% and 30% of fire retardants and 15% urea formaldehyde resin based on oven dry fiber weight were used to manufacture experimental panels. Physical and mechanical properties including thickness swelling, water absorption, bending characteristics, and internal bond strength of the samples were determined. Flame retardant properties of the panels were also investigated using a Cabinet Method along with char index, weight loss and size of ellipse area. Finally, thermogravimetry method was employed to analyze thermal properties of the MDF panels. The results showed that thickness swell and water absorption decreased as the flame retardant increased. The MOR was not affected by the flame retardant treatment for boards bonded with urea formaldehyde resin. The internal bond strength showed a small reduction compared with the controls as the flame retardant chemicals increased but not for boards treated with 5% aluminum trihydrate. When the concentration of flame retardant chemicals increased to 30%, the internal bond generally decreased. Char index, area of ellipse and weight loss reduced as the percentage of flame retardant increased. Sodium aluminate showed the best performance in reducing thermal degradation followed by aluminum trihydrate and zinc borate. Aluminum trihydrate cured closely resemble that of the control during the gelation test. 相似文献
64.
Madhev B. Subramaniam Norman Blakebrough Mohd A. Hashim 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1990,48(1):41-60
Colloidal gas aphrons (CGAs), generated from dilute solutions of four surfactants, were used to clarify palm oil mill effluent (POME), suspensions of microalgae and suspensions of three inorganic minerals. In POME and the algal suspensions, each CGA was most effective at a pH value close to the pK value of the surfactant concerned. This effect was not tested in the inorganic suspensions. The efficiency of air utilization was directly related to the concentration of solids in the suspensions, the size, density and nature of the solids having secondary effects. Comparison with data in the literature led to a general correlation embracing a variety of suspensions and flotation systems. Shedding of collected material from the foam layer was also a direct function of solids concentration. CGAs offer advantages over other systems of air-assisted flotation in relation to the requirements for equipment and to the management of process operations. 相似文献
65.
Almuashi Mohammed Hashim Siti Zaiton Mohd Yusoff Nooraini Syazwan Khairul Nizar Ghabban Fahad 《Multimedia Tools and Applications》2022,81(27):39311-39342
Multimedia Tools and Applications - Analysis of facial images decoding familial features has been attracting the attention of researchers to develop a computerized system interested in determining... 相似文献
66.
Sofie Zarina Lamaming Junidah Lamaming Nurul Fazita Mohammad Rawi Rokiah Hashim Mohamad Haafiz Mohamad Kassim Mohd Hazwan Hussin Yazmin Bustami Othman Sulaiman Mohd Hazim Mohamad Amini Salim Hiziroglu 《Polymer Engineering and Science》2021,61(10):2393-2405
Soy protein is known for its eco-friendly, sustainable, and biodegradable qualities that are likely used as raw material in producing bioadhesive. However, soy protein-based adhesive are lacking in terms of adhesive strength and water-resistance compared to commercial formaldehyde-based adhesives such as phenol and urea-formaldehyde resin. Therefore, continuous research has been done to improve adhesive performance. This can be done via physical or modification methods, including the usage of cross-linking agents, structural modification, enzymatic modification, and the addition of additives. This review will cover these modification methods that give significant enhancement to the water-resistance and adhesive strength of soy protein-based adhesives. 相似文献
67.
68.
The interpretation of way-finding symbols for healthcare facilities in a multicultural community was assessed in a cross-sectional study. One hundred participants recruited from Al Ain city in the United Arab Emirates were asked to interpret 28 healthcare symbols developed at Hablamos Juntos (such as vaccinations and laboratory) as well as 18 general-purpose symbols (such as elevators and restrooms). The mean age was 27.6 years (16–55 years) of whom 84 (84%) were females. Healthcare symbols were more difficult to comprehend than general-purpose signs. Symbols referring to abstract concepts were the most misinterpreted including oncology, diabetes education, outpatient clinic, interpretive services, pharmacy, internal medicine, registration, social services, obstetrics and gynecology, pediatrics and infectious diseases. Interpretation rates varied across cultural backgrounds and increased with higher education and younger age. Signage within healthcare facilities should be tested among older persons, those with limited literacy and across a wide range of cultures. 相似文献
69.
70.
Kharidah Muhammad Feri Kusnandar Dzulkifly Mat Hashim & Russly AbD. Rahman 《International Journal of Food Science & Technology》1999,34(3):275-280
Summary Characteristics of potato starch noodles substituted with native, phosphorylated and commercial phosphorylated (MTS283) tapioca starches were evaluated. Substitution of up to 17% with phosphorylated tapioca starch or up to 35% with MTS283 improved the quality of potato starch noodles. The resulting noodles were transparent and less brittle when uncooked, and were moderately elastic, less sticky and experienced lower cooking loss and less swelling when cooked. Substitution with native tapioca starch of up to 17% was also possible, but the uncooked noodles were less transparent and the cooked noodles swelled more and were less elastic. 相似文献