全文获取类型
收费全文 | 2302篇 |
免费 | 31篇 |
国内免费 | 17篇 |
专业分类
电工技术 | 114篇 |
综合类 | 7篇 |
化学工业 | 693篇 |
金属工艺 | 112篇 |
机械仪表 | 49篇 |
建筑科学 | 31篇 |
矿业工程 | 2篇 |
能源动力 | 90篇 |
轻工业 | 129篇 |
水利工程 | 6篇 |
石油天然气 | 8篇 |
武器工业 | 1篇 |
无线电 | 202篇 |
一般工业技术 | 413篇 |
冶金工业 | 248篇 |
原子能技术 | 48篇 |
自动化技术 | 197篇 |
出版年
2022年 | 20篇 |
2021年 | 24篇 |
2019年 | 18篇 |
2018年 | 20篇 |
2017年 | 17篇 |
2016年 | 42篇 |
2015年 | 15篇 |
2014年 | 37篇 |
2013年 | 112篇 |
2012年 | 68篇 |
2011年 | 78篇 |
2010年 | 83篇 |
2009年 | 96篇 |
2008年 | 108篇 |
2007年 | 90篇 |
2006年 | 73篇 |
2005年 | 77篇 |
2004年 | 56篇 |
2003年 | 71篇 |
2002年 | 64篇 |
2001年 | 64篇 |
2000年 | 51篇 |
1999年 | 45篇 |
1998年 | 122篇 |
1997年 | 96篇 |
1996年 | 76篇 |
1995年 | 61篇 |
1994年 | 52篇 |
1993年 | 54篇 |
1992年 | 29篇 |
1991年 | 45篇 |
1990年 | 22篇 |
1989年 | 35篇 |
1988年 | 26篇 |
1987年 | 38篇 |
1986年 | 30篇 |
1985年 | 22篇 |
1984年 | 36篇 |
1983年 | 30篇 |
1982年 | 28篇 |
1981年 | 28篇 |
1980年 | 23篇 |
1979年 | 26篇 |
1978年 | 14篇 |
1977年 | 20篇 |
1976年 | 19篇 |
1975年 | 13篇 |
1974年 | 11篇 |
1973年 | 15篇 |
1972年 | 10篇 |
排序方式: 共有2350条查询结果,搜索用时 15 毫秒
91.
92.
93.
94.
Jomjai Peerapattana Kuniko Otsuka Yusuke Hattori 《Drug development and industrial pharmacy》2015,41(3):515-521
The objective of this research was to quantify the α-mangostin content in mangosteen pericarp (MP) ointment as a colloidal dispersion using near-infrared (NIR) spectroscopy. Various concentrations of MP (IP and EP) ointments containing both internal and external pericarps were prepared and the NIR spectra of these ointments were measured. The NIR spectrum of each ointment was correlated with α-mangostin concentration by partial least square (PLS) regression. Validation of the models was performed and their predictive ability was also investigated. The equation and R2 value for the prediction of α-mangostin concentration in IP ointment were y?=?0.9843x?+?0.4441 and 0.9730 and those in EP ointment were y?=?0.9569x?+?0.1142 and 0.9136, respectively. The biases of the IP and EP ointment models were 0.23 and 0.00, respectively. The results showed that NIR could be a useful tool for the quality control of herbal medicine in hydrophilic ointment without any sample preparation. It could predict α-mangostin content in hydrophilic ointment at very low concentration with sufficient accuracy. 相似文献
95.
96.
Ryuta Shigefuku Hideaki Takahashi Hiroyasu Nakano Tsunamasa Watanabe Kotaro Matsunaga Nobuyuki Matsumoto Masaki Kato Ryo Morita Yousuke Michikawa Tomohiro Tamura Tetsuya Hiraishi Nobuhiro Hattori Yohei Noguchi Kazunari Nakahara Hiroki Ikeda Toshiya Ishii Chiaki Okuse Shigeru Sase Fumio Itoh Michihiro Suzuki 《International journal of molecular sciences》2016,17(9)
The progression of chronic liver disease differs by etiology. The aim of this study was to elucidate the difference in disease progression between chronic hepatitis C (CHC) and nonalcoholic fatty liver disease (NAFLD) by means of fibrosis markers, liver function, and hepatic tissue blood flow (TBF). Xenon computed tomography (Xe-CT) was performed in 139 patients with NAFLD and 152 patients with CHC (including liver cirrhosis (LC)). The cutoff values for fibrosis markers were compared between NAFLD and CHC, and correlations between hepatic TBF and liver function tests were examined at each fibrosis stage. The cutoff values for detection of the advanced fibrosis stage were lower in NAFLD than in CHC. Although portal venous TBF (PVTBF) correlated with liver function tests, PVTBF in initial LC caused by nonalcoholic steatohepatitis (NASH-LC) was significantly lower than that in hepatitis C virus (C-LC) (p = 0.014). Conversely, the liver function tests in NASH-LC were higher than those in C-LC (p < 0.05). It is important to recognize the difference between NAFLD and CHC. We concluded that changes in hepatic blood flow occurred during the earliest stage of hepatic fibrosis in patients with NAFLD; therefore, patients with NAFLD need to be followed carefully. 相似文献
97.
Moo-Yeal Lee Kyung-Jin Hong Seung Pil Han Toshio Kajiuchi 《Korean Journal of Chemical Engineering》2014,31(2):188-193
Similar to what lipase does, a surface-active enzyme was developed by attaching peroxidase on combshaped polymaleic anhydride-alt-1-tetradecene (PMA-TD) in a microemulsion system composed of n-butyl acetate and buffer solution, and its catalytic characteristics of polyphenol synthesis were investigated in an aqueous solution. The modified peroxidase with PMA-TD tended to form self-assembled aggregates like micelles in the aqueous solution and could be concentrated at solvent/water interfaces without unfolding of the enzyme. The efficiency of conversion of 2,4-dichlorophenol to phenolic oligomers was approximately 2-fold improved with the modified peroxidase compared to native peroxidase. The K m and V max values for the modified peroxidase were 1.5-fold lower and 2-fold higher, respectively. The hydrodynamic diameter of the micelle on the modified peroxidase increased with the reaction time, indicating that phenolic products were accumulated in the hydrophobic interior of micelles. In addition, the molecular weight (MW) of phenolic polymers was much larger in the system with the modified peroxidase. These observations implied that the modified peroxidase with hydrophobic side chains formed micellar structures by solubilization of phenolic products and further polymerization reaction could occur in the hydrophobic interior of the micelles. 相似文献
98.
One-pot polymerization of polyimide from 3,3′,4,4′-biphenyl tetracarboxylic dianhydride (BPDA) and 4,4′-oxydianiline (ODA) was examined. The equilibrium in the polyimide with water was examined in detail in p-chlorophenol solution during the polymerization. The equilibrium constant was expressed by log K = 1.50 + 1433 (1/T). The polymerization reaction is exothermic. The molecular weight increased with decrease of temperature. © 1996 John Wiley & Sons, Inc. 相似文献
99.
A novel drawing method, vibrating hot drawing, was successfully applied to poly(ethylene terephthalate) fiber, which has a normal molecular weight (IV = 0.7 dL/g) and was prepared by melt spinning. The process was divided into three steps, with differing conditions in drawing temperature, applied tension, vibrating frequency, and amplitude. The drawing temperature and vibration frequency were decided by considering the αa dispersion of the polymer. In spite of a low draw ratio (7.7) and a low crystallinity (0.55), the birefringence and dynamic storage modulus at room temperature of the 3rd-step fiber reached 0.260 and 36 GPa, respectively. The modulus remains at a high level at elevated temperatures, for example, 29 GPa at 100°C and 17 GPa at 200°C. Further, it was found from temperature and intensity of the αa dispersion peak that the movements of amorphous chains are strongly inhibited. © 1996 John Wiley & Sons, Inc. 相似文献
100.
Various copolymides were prepared from two acid dianhydrides (BPDA, 3,3′,4,4′-biphenyl tetracarboxylic dianhydride; PMDA, pyromelitic dianhydride) and two diamines (PPD, p-phenylene diamine; ODA, 4,4′-oxydianiline). The thermal and mechanical properties of these polyimides were examined in detail. By appropriately selecting the ratios of the acid dianhydride component and the diamine component, polyimide films having desirable mechanical and thermal characteristics can be obtained. Further, it was proved that there is a correlation between the properties and the compositions of the copolyimides and that the properties could be estimated from the compositions by the use of multiple regression analysis. © 1996 John Wiley & Sons, Inc. 相似文献