全文获取类型
收费全文 | 247篇 |
免费 | 9篇 |
专业分类
电工技术 | 6篇 |
化学工业 | 121篇 |
金属工艺 | 13篇 |
机械仪表 | 2篇 |
建筑科学 | 8篇 |
轻工业 | 26篇 |
石油天然气 | 1篇 |
无线电 | 6篇 |
一般工业技术 | 50篇 |
冶金工业 | 6篇 |
原子能技术 | 10篇 |
自动化技术 | 7篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 3篇 |
2020年 | 2篇 |
2019年 | 2篇 |
2018年 | 4篇 |
2017年 | 2篇 |
2016年 | 3篇 |
2015年 | 2篇 |
2014年 | 2篇 |
2013年 | 8篇 |
2012年 | 7篇 |
2011年 | 14篇 |
2010年 | 9篇 |
2009年 | 13篇 |
2008年 | 7篇 |
2007年 | 9篇 |
2006年 | 11篇 |
2005年 | 2篇 |
2004年 | 3篇 |
2003年 | 5篇 |
2002年 | 7篇 |
2001年 | 7篇 |
2000年 | 4篇 |
1999年 | 10篇 |
1998年 | 5篇 |
1997年 | 4篇 |
1996年 | 3篇 |
1995年 | 5篇 |
1994年 | 4篇 |
1993年 | 5篇 |
1992年 | 4篇 |
1991年 | 14篇 |
1990年 | 8篇 |
1989年 | 4篇 |
1988年 | 8篇 |
1987年 | 13篇 |
1986年 | 8篇 |
1985年 | 10篇 |
1984年 | 7篇 |
1983年 | 3篇 |
1982年 | 4篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1973年 | 2篇 |
1970年 | 1篇 |
1968年 | 1篇 |
1967年 | 2篇 |
排序方式: 共有256条查询结果,搜索用时 671 毫秒
31.
32.
33.
Improvement of poly(vinyl alcohol)/poly(vinylpyrrolidone) blended hydrogel by radiation crosslinking
1IntroductionHydrogelisapolymericmaterial(syntheticornaturaJ)whichswellswhenplacedincontactwithwaterbutisnotsolubleandhastheabililtytoretainwaterwithinitsstructare.InIecentyears,muchattentionhasbeenfocusedontheresearchanddevelopmentofthepolymerhydIogelsforbiomaterials,suchascontactlenses,wounddressing,enzymeimmunoassay,cathetersanddIugdeliverysystems[1~3].Adressingisoftencoveredonthewotmdtoaccelerateitshealing.TheIearetwokindsofdiessings:drytypeandwettype.Ithasbeenreportedthatheallngwithawe… 相似文献
34.
Keizo Uematsu Masaki Takagi Tsunehiro Honda Nozomu Uchida Katsuichi Saito 《Journal of the American Ceramic Society》1989,72(8):1476-1478
Hydroxyapatite powder was synthesized and formed into a compact in an aqueous medium using a filter-cake method. The compact was hot isostatically pressed at 700° to 1000°C and 100 MPa for 2 h. Fully dense, transparent materials were obtained above 800°C. Both forming and densification methods were found to be important in obtaining transparent materials. 相似文献
35.
Processability of thermoplastic elastomer (TPE) prepared by radiation-induced grafting of methyl methacrylate (MMA) onto radiation vulcanized natural rubber latex (RVNRL) has been evaluated using a kneader and a hot roll mill at 150°C. It was found that mixing time and revolution rate (rpm) of the kneader have significantly affected the processability. The longer mixing time and the higher revolution rate result in better processability. In such processing conditions, however, the mechanical properties were found to be inferior because the molecular chain scissions occurred during the mixing. A considerable improvement of mechanical properties was obtained when the mixing was carried out without added process oils. Blends of the grafted vulcanized natural rubber latex (RVNRL-g-PMMA) and MMA grafted on unvulcanized natural rubber latex (NRL-g-PMMA) improved processability where the better processability could be achieved at a shorter mixing time and a lower revolution rate. In addition, a comparable value of mechanical properties was obtained. 相似文献
36.
An improved method of high performance liquid chromatography (HPLC) has been developed for the separation and quantitation
of low levels of free fatty acids as they occur in mammalian tissues. The fatty acid analysis is based on the esterification
of the carboxylic group with 9-anthryldiazomethane (ADAM). HPLC separation and fluorescence measurement of fatty acid ADAM
esters allow the determination of pmole amounts of fatty acids.
The amounts of free fatty acids of resident and activated alveolar macrophages were determined by the fluorometric HPLC method.
There were approximately 2 μg/106 cells of free fatty acids. In resident macrophages, free 20∶4 was a minor component (0.8% of total free fatty acids), while
significant amounts of 20∶4 were found in the total glycerophospholipids, representing 16.6% of the total fatty acids. A marked
increase in amounts of 20∶4 (8 times) occurred in activated macrophages stimulated for 1 hr with opsonized zymosan. Small
but significant increases (1.5 times) also occurred in other fatty acids. These results show that the release reaction of
fatty acids was not selective for 20∶4 in alveolar macrophages after the challenge with opsonized zymosan. 相似文献
37.
Kazuya Nakata Keizo Udagawa Tsuyoshi Ochiai Hideki Sakai Taketoshi Murakami Masahiko Abe Akira Fujishima 《Materials Chemistry and Physics》2011
TiO2-polydimethylsiloxane (TiO2-PDMS) composite films are prepared using the sol–gel method from a Ti(OBu)4–benzoylacetone solution containing PDMS. The prepared films are cured by irradiation with ultraviolet (UV) light. Structural changes in the films after UV irradiation are confirmed by UV–vis absorption experiments, which show that an absorption band characteristic of the benzoylacetonate chelate rings disappears. This finding is ascribed to structural changes associated with the dissociation of the chelate rings. The IR spectra of the thin films exhibit a broad absorption band after UV irradiation, indicating that a Ti–O–Ti network forms in the thin film. Contact angles are measured for the TiO2-PDMS thin films, showing wettability conversion from hydrophobic to superhydrophilic states by irradiation with oxygen plasma for 1 s. This phenomenon is explained by XPS experiments which reveal that the number of carbon atoms decreases, whereas the number of oxygen atoms increases on the surface of the TiO2-PDMS composite films. Finally, hydrophobic–superhydrophilic patterns are fabricated based on a patterned TiO2-PDMS composite film. The film displays a rapid change to superhydrophilicity over the whole film surface upon plasma irradiation for 1 s, which means that the wettability patterns are rapidly erasable. 相似文献
38.
39.
Yamamoto K Miyake H Kusunoki M Osaki S 《Journal of Bioscience and Bioengineering》2011,112(6):545-550
The structures of the E277A isomaltase mutant from Saccharomyces cerevisiae in complex with isomaltose or maltose were determined at resolutions of 1.80 and 1.40 Å, respectively. The root mean square deviations between the corresponding main-chain atoms of free isomaltase and the E277Α-isomaltose complex structures and those of free isomaltase and the E277A-maltose complex structures were found to be 0.131 Å and 0.083 Å, respectively. Thus, the amino acid substitution and ligand binding do not affect the overall structure of isomaltase. In the E277A-isomaltose structure, the bound isomaltose was readily identified by electron densities in the active site pocket; however, the reducing end of maltose was not observed in the E277A-maltose structure. The superposition of maltose onto the E277A-maltose structure revealed that the reducing end of maltose cannot bind to the subsite + 1 due to the steric hindrance from Val216 and Gln279. The amino acid sequence comparisons with α-glucosidases showed that a bulky hydrophobic amino acid residue is conserved at the position of Val216 in α-1,6-glucosidic linkage hydrolyzing enzymes. Similarly, a bulky amino acid residue is conserved at the position of Gln279 in α-1,6-glucosidic linkage-only hydrolyzing α-glucosidases. Ala, Gly, or Asn residues were located at the position of α-1,4-glucosidic linkage hydrolyzing α-glucosidases. Two isomaltase mutant enzymes – V216T and Q279A – hydrolyzed maltose. Thus, the amino acid residues at these positions may be largely responsible for determining the substrate specificity of α-glucosidases. 相似文献
40.