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排序方式: 共有71条查询结果,搜索用时 15 毫秒
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Przemysław J. Dereń Dagmara Stefańska Maciej Ptak Mirosław Mączka Wiktoria Walerczyk Grzegorz Banach 《Journal of the American Ceramic Society》2014,97(6):1883-1889
ZnAl2O4 doped with Ti4+ (2%) was synthesized by the hydrothermal method at 220°C at pressure of 25 bars. An average grain size of the as‐prepared sample was 3 nm, the samples with biggest grain size were obtained after annealing at 300°C, 500°C, 600°C, 700°C, and 900°C, diameter of the latter was about 33 nm. IR spectroscopy indicated that ZnAl2O4 was partially inverted. The degree of the inversion decreases with increase in the annealing temperature but increases with increasing Ti4+ content. Absorption and emission spectra as well as emission decay profiles were recorded at 300 and 77 K. The observed spectra are due to charge‐transfer O2??Ti4+ transitions. Color of the emission depends on the nanocrystal size and with increase in its diameter changes from violet to blue, accordingly the absorption bands exhibit redshift. The calculations based on Density Functional Theory confirmed the experimental results. 3d electrons of titanium ions form the bottom of the ZnAl2O4:Ti4+ conduction band, oxygen, aluminum or zinc vacancies create additional levels in the gahnite energy band gap. It was also found that in ZnAl2O4 aluminum or zinc vacancy induces magnetism with relatively high magnetic moment close to 1 μB per vacancy. 相似文献
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Roman Cichon Krystyna Elkowicz Halina Kozlowska Antoni Rutkowski Willem C. Sauer 《Journal of the science of food and agriculture》1980,31(7):677-684
The nutritive value of protein of blends consisting of meat and soya bean protein products, which replaced either 20 or 40 % of protein of meat, were determined in rat feeding experiments. Protein efficiency ratio (PER) and net protein utilisation (NPU) were significantly lower (P<0.05) in blends containing either 20% protein from soya isolate or 40% protein from soya concentrate or soya flakes than blends containing sirloin only. However, there were no significant differences in PER and NPU when model meat (consisting of 70 and 30% protein from sirloin and connective tissue, respectively) was replaced by up to 20% protein from soya isolate or up to 40% protein from soya concentrate. 相似文献
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Protein concentrates were obtained on the laboratory scale from pea and faba bean, using waste effluents of potato, whey or water for protein extraction. The concentrates were analysed in order to determine their content of basic components and anti-nutritive substances. It was found that the concentrates obtained with waste effluents of potato were characterized by higher protein content than those obtained with whey. On the other hand, amino acid content was similar in all concentrates. Phytic phosphorus content and activity of trypsin inhibitors in the protein concentrates should not constitute any danger for animals and human beings. 相似文献
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Barbara Raab Halina Leman K. D. Schwenke Halina Kozlowska 《Molecular nutrition & food research》1992,36(3):239-247
Seven rapeseed varieties were characterized by investigation of the patterns of buffer soluble proteins using polyacrylamide gel electrophoresis and high-performance liquid chromatography (size-exclusion and cation-exchange chromatography). Most pronounced differences were found in proteins not belonging to 12 S and 2 S storage proteins having presumably metabolic functions. Quantitative variations dominate within the low molecular mass 2 S storage proteins. 相似文献
9.
Time dependence of bioactive compounds and antioxidant capacity during germination of different cultivars of broccoli and radish seeds 总被引:2,自引:0,他引:2
Cristina Martinez-Villaluenga Elena Peñas Ewa Ciska Mariusz K. Piskula Halina Kozlowska Concepción Vidal-Valverde Juana Frias 《Food chemistry》2010
Optimisation of the germination process of different cultivars of broccoli (Brassica oleracea var. italica cv. Lucky, cv. Tiburon and cv. Belstar) and radish (Raphanus sativus cv. Rebel and cv. Bolide) seeds in relation to the content of glucosinolates (GLS), vitamin C and total antioxidant capacity was carried out in order to maximise the health-promoting properties of Brassica sprouts. The content of total and individual GLS varied between species, among cultivars, and germination time. Glucoraphanin in broccoli and glucoraphenin in radish were the predominant GLS in raw seeds (61–77 and 63–129 μmol/g DM, respectively) and, although their content decreased during germination, they were maintained in rather large proportions in sprouts. Vitamin C was not detected in raw seeds and its content increased sharply in broccoli and radish sprouts (162–350 and 84–113 mg/100 g DM, respectively). Raw brassica seeds are an excellent source of antioxidant capacity (64–90 and 103–162 μmol Trolox/g DM in broccoli and radish, respectively) and germination led to a sharp increase. Germination of broccoli cv. Belstar and radish cv. Rebel for 4 days provided the largest glucoraphanin and glucoraphenin content, respectively, and also brought about large amounts of vitamin C and antioxidant capacity. 相似文献
10.
Isabel Sierra Concepción Vidal-Valverde Halina Kozlowska 《European Food Research and Technology》1998,206(2):126-129
Seeds of yellow pea lupin (Lupinus luteus L., cv. Juno), pea (Pisum sativum L., cv. Ergo) and faba bean (Vicia faba sp. minor Harz., cv. Tibo) were harvested at different stages of seed maturity. Changes in thiamin and riboflavin levels
during growth and maturation were studied. The results obtained showed that thiamin and riboflavin were found in high abundance
early in the development of lupins and peas, but that their content decreased during maturation. The thiamin content of faba
bean seeds increased from 33 to 47 days after flowering (DAF), then a decrease was observed until 61 DAF; however, no significant
differences between these levels in faba bean seeds harvested from 61 to 89 DAF were found. The riboflavin content of faba
beans increased after 54 DAF, and no significant changes were observed between then and 89 DAF. The thiamin and riboflavin
contents in lupin, pea and faba bean seeds during development were fitted to modelling curves in order to predict the vitamin
content at different stages of maturity.
Received: 17 July 1997 相似文献