全文获取类型
收费全文 | 366篇 |
免费 | 30篇 |
专业分类
电工技术 | 47篇 |
化学工业 | 90篇 |
金属工艺 | 7篇 |
机械仪表 | 5篇 |
建筑科学 | 2篇 |
能源动力 | 8篇 |
轻工业 | 28篇 |
石油天然气 | 1篇 |
无线电 | 44篇 |
一般工业技术 | 65篇 |
冶金工业 | 70篇 |
原子能技术 | 9篇 |
自动化技术 | 20篇 |
出版年
2023年 | 4篇 |
2022年 | 11篇 |
2021年 | 16篇 |
2020年 | 3篇 |
2019年 | 5篇 |
2018年 | 13篇 |
2017年 | 9篇 |
2016年 | 18篇 |
2015年 | 7篇 |
2014年 | 6篇 |
2013年 | 18篇 |
2012年 | 17篇 |
2011年 | 20篇 |
2010年 | 14篇 |
2009年 | 12篇 |
2008年 | 15篇 |
2007年 | 14篇 |
2006年 | 9篇 |
2005年 | 7篇 |
2004年 | 5篇 |
2003年 | 16篇 |
2002年 | 13篇 |
2001年 | 13篇 |
2000年 | 6篇 |
1999年 | 3篇 |
1998年 | 31篇 |
1997年 | 16篇 |
1996年 | 6篇 |
1995年 | 6篇 |
1994年 | 7篇 |
1993年 | 10篇 |
1992年 | 2篇 |
1991年 | 3篇 |
1990年 | 3篇 |
1989年 | 3篇 |
1988年 | 2篇 |
1987年 | 4篇 |
1986年 | 6篇 |
1985年 | 4篇 |
1984年 | 3篇 |
1983年 | 3篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 3篇 |
1978年 | 1篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1968年 | 1篇 |
1966年 | 1篇 |
排序方式: 共有396条查询结果,搜索用时 781 毫秒
71.
72.
Md. Obaidullah Takeshi Furusawa Iqbal Ahmed Siddiquey Masahide Sato Noboru Suzuki 《Advanced Powder Technology》2017,28(10):2678-2686
Alumina (Al2O3) coated ZnO core-shell structures were synthesized by a novel, fast, and facile route utilizing microwave (MW) irradiation to control photocatalytic property of ZnO. The phase analysis and the core–shell structure development were corroborated by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), X-ray fluorescence (XRF), transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray (EDX) analysis and Fourier transform infrared spectroscopy (FT-IR). The XPS results affirmed that elements on the coated surface were Al and O. Zeta potential analysis predicted the presence of Al2O3 layer on ZnO due to almost similar zeta potential curve for pure Al2O3 and Al2O3 coated ZnO nanoparticles. There was no significant change in band gap energy of ZnO after amorphous Al2O3 coating as obtained from derived data of the reflectance spectra but gradual decreasing of reflectance in the visible range, measured by UV–vis spectroscopy, of the prepared core-shell nanoparticle may be due to the coating of amorphous Al2O3 on ZnO. The photocatalytic efficiency of ZnO was reduced after amorphous Al2O3 layer as confirmed by the photodegradation of methylene blue under UV irradiation. 相似文献
73.
74.
Swarnalakshmi Raman Arief Waskitho Resmi Raju Takuma Iwasa Daisuke Ikutame Kazuo Okura Masamitsu Oshima Yoshizo Matsuka 《International journal of molecular sciences》2022,23(11)
Trigeminal neuralgia is unilateral, lancinating, episodic pain that can be provoked by routine activities. Anticonvulsants, such as carbamazepine, are the drugs of choice; however, these possess side-effects. Microvascular decompression is the most effective surgical technique with a higher success rate, although occasionally causes adverse effects. The potential treatment for this type of pain remains unmet. Increased tetrahydrobiopterin (BH4) levels have been reported in association with axonal injury. This study aimed to evaluate the effect of tranilast on relieving neuropathic pain in animal models and analyze the changes in BH4 synthesis. Neuropathic pain was induced via infraorbital nerve constriction. Tranilast, carbamazepine, or saline was injected intraperitoneally to assess the rat’s post-intervention pain response. In the von Frey’s test, the tranilast and carbamazepine groups showed significant changes in the head withdrawal threshold in the ipsilateral whisker pad area. The motor coordination test showed no changes in the tranilast group, whereas the carbamazepine group showed decreased performance, indicating impaired motor coordination. Trigeminal ganglion tissues were used for the PCR array analysis of genes that regulate the BH4 pathway. Downregulation of the sepiapterin reductase (Spr) and aldoketo reductase (Akr) genes after tranilast injection was observed compared to the pain model. These findings suggest that tranilast effectively treats neuropathic pain. 相似文献
75.
Naw Rutha PAW Takuma KIMURA Tatsuo ISHIJIMA Yasunori TANAKA Yusuke NAKANO Yoshihiko UESUGI Shiori SUEYASU Shu WATANABE Keitaro NAKAMURA 《等离子体科学和技术》2021,23(10):105505-203
Titanium dioxide (TiO2) nanopowder (P-25;Degussa AG) was treated using dielectric barrier discharge (DBD) in a rotary electrode DBD (RE-DBD) reactor.Its electrical and optical characteristics were investigated during RE-DBD generation.The treated TiO2 nanopowder properties and structures were analyzed using x-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR).After RE-DBD treatment,XRD measurements indicated that the anatase peak theta positions shifted from 25.3° to 25.1°,which can be attributed to the substitution of new functional groups in the TiO2 lattice.The FTIR results show that hydroxyl groups (OH) at 3400 cm-1 increased considerably.The mechanism used to modify the TiO2 nanopowder surface by air DBD treatment was confirmed from optical emission spectrum measurements.Reactive species,such as OH radical,ozone and atomic oxygen can play key roles in hydroxyl formation on the TiO2 nanopowder surface. 相似文献
76.
Organic–Inorganic Hybrid Hollow Nanoparticles Suppress Oxidative Stress and Repair Damaged Tissues for Treatment of Hepatic Fibrosis 下载免费PDF全文
Koichiro Hayashi Takuma Maruhashi Wataru Sakamoto Toshinobu Yogo 《Advanced functional materials》2018,28(13)
Current therapeutic options for the treatment of liver fibrosis are limited, and transplantation is often the only effective option for end‐stage fibrotic diseases. To overcome this problem, a nanoparticle‐based treatment as an alternative to transplantation is developed. Multifunctional organic–inorganic hybrid hollow nanoparticles (HNPs) containing silibinin are synthesized by mixing precursors in ammonia water at 60 °C for 1 min. The HNPs are mainly composed of siloxanes and disulfides and have surface thiols. The disulfides are cleaved by intracellular glutathione and reduced to thiols, leading to the deformation of the HNPs. Silibinin molecules are released through the cracks formed by HNP deformation. Furthermore, the HNPs suppress the generation of hydroxyl radicals, a major cause of liver fibrosis, via sulfenylation reactions of HNP thiols. Retinol‐modified HNPs target Kupffer cells and hepatic stellate cells, which are essential for hepatic fibrogenesis. The combined suppression of hydroxyl radical generation and release of silibinin using the HNPs decreases the proportion of fibrotic tissues and improves hepatic function. The therapeutic efficacy is greater than can be achieved by the suppression of hydroxyl radical generation alone and the injection of silibinin alone. Thus, HNPs are promising for the treatment of liver fibrosis. 相似文献
77.
The reduction of nitric oxide during combustion of coal char in a fluidized-bed combustor was examined with respect to two reactions : a char-catalysed reaction; and a char-consuming reaction, which control nitric oxide emissions. The relative importance of the two reactions was investigated by measuring detailed material balances for the reactions. The product distribution was explained in terms of three fundamental parallel reaction paths. Reaction rates were investigated with a fixed-bed flow reactor over the temperature range 883–1194 K, the same as the fluidized bed combustor. 相似文献
78.
M Durante L Cella Y Furusawa K George G Gialanella G Grossi M Pugliese M Saito TC Yang 《Canadian Metallurgical Quarterly》1998,73(3):253-262
Maternal pre-pregnancy obesity is a risk factor for pre-eclampsia (proteinuric hypertension in pregnancy) among North American and European women. We studied the relationship between maternal obesity and risk of pre-eclampsia among Zimbabwean women. A case-control study was conducted at Harare Maternity Hospital, Harare, Zimbabwe, between June 1995 and April 1996. Study participants were 144 women with pre-eclampsia and 194 normotensive women serving as controls. Maternal weight, height and mid-arm circumference were measured and recorded during study participants' postpartum hospital admission. Maternal mid-arm circumference, considered to be relatively stable during pregnancy among women of developing countries, was used as the primary indicator of maternal pre-pregnancy obesity. Logistic regression procedures were used to estimate odds ratios and 95% confidence intervals. There were linear trends in risk of pre-eclampsia with increasing mid-arm circumference, increasing weight and increasing body mass index. After adjusting for potential confounding factors, women in the highest quintile for mid-arm circumference (28-39 cm) were 4.4 times more likely to have had their pregnancy complicated by pre-eclampsia than women in the lowest quintile (21-23 cm). Odds ratios of similar magnitude were observed for the other anthropometric measures. To our knowledge, this is the first study to demonstrate a positive association between maternal obesity and pre-eclampsia risk in a black African population. Biological mechanisms thought to explain this relatively consistent epidemiological finding include endothelial cell injury, possibly resulting from hyperlipidaemia. 相似文献
79.
Monoclonal antibodies (mAbs) were prepared against the 8597/CV94 strain of turkey rhinotracheitis virus (TRTV). These mAbs were used to investigate antigenic relationships among three strains (8597/CV94, 1162/92 and CVL14/1 strain) of TRTV, together with polyclonal chicken and rabbit antisera to 8597/CV94 strain, and guinea pig antisera to each of the three strains. Thirty mAbs to the glycoprotein (G:3 clones), fusion (F1:6 clones), phosphorylated (P:6 clones), nucleocapsid (N:12 clones), and matrix (M:3 clones) proteins of viral antigen were obtained by cell fusion. Among these, two mAbs to F1 protein showed virus neutralizing activity. The results of ELISA test indicated that some mAbs only reacted to the 8597/CV94 strain, some reacted to 8597/CV94 and 1162/92 strains, and others reacted to all three viral strains. In neutralization tests with the three virus strains, polyclonal chicken and rabbit antisera against the 8597/ CV94 strain showed the same antibody titers. Results with four neutralizing mAbs including two previously reported mAbs [Ref. 21] indicated the titers of two mAbs (Pn2-2E and Pn3-2F) to 8597/CV94 were much higher than those to the other two viral strains. No differences were observed in the titers of the other two mAbs (Pn01-8E and Pn06-4D) against any viral strains. In cross-neutralization tests with polyclonal guinea pig antisera, there was some variations among viral strains. This work demonstrated that the Japanese isolate 8597/CV94 of TRTV is somewhat different in antigenicity from two British isolates from chickens and turkeys. 相似文献
80.
Recent advances in biomaterial technology have made alloplastic bone substitutes more predictable when used with the proper clinical methodology in carefully selected patients. In this animal study, early bone formation using a novel resorbable bioactive glass in the repair of surgically created bony defects in the rat mandible was investigated. Biopsies taken from the implanted sites after 1, 2, 3, 4, 8, and 16 weeks were examined histologically by means of standard cell-staining techniques. In addition, an electron probe microanalyzer was used to determine the presence and distribution of specific elements in samples taken after 16 weeks. Results indicated the early stage of osteoconductive bone growth after approximately 4 weeks. After 16 weeks, electron probe micro-analyzer scans indicated the formation of a calcium-phosphate shell formed in situ and the resorption of silica to background levels. 相似文献