全文获取类型
收费全文 | 1498篇 |
免费 | 5篇 |
专业分类
电工技术 | 4篇 |
综合类 | 1篇 |
化学工业 | 56篇 |
金属工艺 | 10篇 |
机械仪表 | 13篇 |
建筑科学 | 11篇 |
能源动力 | 9篇 |
轻工业 | 57篇 |
水利工程 | 3篇 |
无线电 | 29篇 |
一般工业技术 | 78篇 |
冶金工业 | 1195篇 |
原子能技术 | 1篇 |
自动化技术 | 36篇 |
出版年
2022年 | 3篇 |
2021年 | 3篇 |
2020年 | 2篇 |
2019年 | 4篇 |
2017年 | 3篇 |
2016年 | 4篇 |
2015年 | 4篇 |
2014年 | 2篇 |
2013年 | 15篇 |
2012年 | 12篇 |
2011年 | 18篇 |
2010年 | 15篇 |
2009年 | 9篇 |
2008年 | 16篇 |
2007年 | 11篇 |
2006年 | 19篇 |
2005年 | 10篇 |
2003年 | 13篇 |
2002年 | 8篇 |
2001年 | 12篇 |
2000年 | 7篇 |
1999年 | 37篇 |
1998年 | 318篇 |
1997年 | 190篇 |
1996年 | 142篇 |
1995年 | 79篇 |
1994年 | 70篇 |
1993年 | 72篇 |
1992年 | 10篇 |
1991年 | 20篇 |
1990年 | 19篇 |
1989年 | 24篇 |
1988年 | 31篇 |
1987年 | 31篇 |
1986年 | 26篇 |
1985年 | 22篇 |
1984年 | 9篇 |
1983年 | 8篇 |
1982年 | 12篇 |
1981年 | 17篇 |
1980年 | 19篇 |
1979年 | 7篇 |
1978年 | 10篇 |
1977年 | 35篇 |
1976年 | 75篇 |
1975年 | 8篇 |
1974年 | 2篇 |
1972年 | 5篇 |
1971年 | 4篇 |
1970年 | 2篇 |
排序方式: 共有1503条查询结果,搜索用时 15 毫秒
101.
ABSTRACT: Quality assessment results of cooked meat can be significantly affected by sample preparation with different cooking techniques. A combi oven is a relatively new cooking technique in the U.S. market. However, there was a lack of published data about its effect on quality measurements of chicken meat. Broiler breast fillets deboned at 24‐h postmortem were cooked with one of the 3 methods to the core temperature of 80 °C. Cooking methods were evaluated based on cooking operation requirements, sensory profiles, Warner–Bratzler (WB) shear and cooking loss. Our results show that the average cooking time for the combi oven was 17 min compared with 31 min for the commercial oven method and 16 min for the hot water method. The combi oven did not result in a significant difference in the WB shear force values, although the cooking loss of the combi oven samples was significantly lower than the commercial oven and hot water samples. Sensory profiles of the combi oven samples did not significantly differ from those of the commercial oven and hot water samples. These results demonstrate that combi oven cooking did not significantly affect sensory profiles and WB shear force measurements of chicken breast muscle compared to the other 2 cooking methods. The combi oven method appears to be an acceptable alternative for preparing chicken breast fillets in a quality assessment. 相似文献
102.
Joseph Chen Mandara Savage Jie James Zhu 《The International Journal of Advanced Manufacturing Technology》2008,36(1-2):43-52
This paper describes the development of an artificial neural network-based in-process mixed-material-caused flash monitoring
system (ANN-IPMFM) in the injection molding process. This proposed system integrates two sub-systems. One is the vibration
monitoring sub-system that utilizes an accelerometer sensor to collect and process vibration signals during the injection
molding process. The other, a threshold prediction sub-system, predicts a control threshold based on the process parameter
settings, thus allowing the system to adapt to changes in these settings. The integrated system compares the monitored vibration
signals with the control threshold to predict whether or not flash will occur. The performance of the ANN-IPMFM system was
determined by using varying ratios of polystyrene (PS) and low-density polyethylene (LDPE) in the injection molding process,
and comparing the number of actual occurrences of flash with the number of occurrences predicted by the system. After a 180
trials, results demonstrated that the ANN-IPMFM system could predict flash with 92.7% accuracy. 相似文献
103.
Sofia Johansson Geoffrey P. Savage 《International Journal of Food Science & Technology》2011,46(11):2232-2239
Silver beet (Beta vulgaris var. cicla) leaves contain oxalates, and the addition of yoghurt, a food rich in calcium, to stir‐fried leaves was investigated as a way of reducing the soluble oxalate content. Fourteen participants ingested 115 g stir‐fried silver beet leaves with or without standard yoghurt and low‐fat yoghurt, respectively. Stir‐fried silver beet leaves contained 209.1 ± 0.1 mg of total oxalates per meal fresh weight (FW) and 109.2 ± 0.1 mg of soluble oxalates per meal FW. The proportion of soluble oxalates was reduced from 52% to a mean of 30% of the total oxalates when standard yoghurt or low‐fat yoghurt was added. The mean absorption of oxalate was determined by measuring the output of oxalate in the urine over a 6‐h period following ingestion of the meals. The mean absorption of oxalate from stir‐fried silver beet leaves was 2.41%, which reduced to 1.10% and 0.89% when consumed with standard yoghurt and low‐fat yoghurt, respectively. 相似文献
104.
O Gaillot P di Camillo P Berche R Courcol C Savage 《Canadian Metallurgical Quarterly》1999,37(3):762-765
CHROMagar Salmonella (CAS), a new chromogenic medium, was retrospectively compared to Hektoen enteric agar (HEA) with 501 Salmonella stock isolates and was then prospectively compared to HEA for the detection and presumptive identification of Salmonella spp. with 508 stool samples before and after enrichment. All stock cultures (100%), including cultures of H2S-negative isolates, yielded typical mauve colonies on CAS, while 497 (99%) isolates produced typical lactose-negative, black-centered colonies on HEA. Following overnight incubation at 37 degreesC, a total of 20 Salmonella strains were isolated from the 508 clinical samples. Sensitivities for primary plating and after enrichment were 95% (19 isolates) and 100% (20 isolates), respectively, for CAS and 80% (16 isolates) and 100% (20 isolates), respectively, for HEA. The specificity of CAS (88.9%) was significantly higher than that of HEA (78.5%; P < 0.0001). On the basis of its good sensitivity and specificity, CAS medium can be recommended for use for primary plating when human stool samples are screened for Salmonella spp. 相似文献
105.
106.
Superantigens (SAgs) are extremely potent stimulants of T cell activity that have been implicated in the etiopathophysiology of inflammatory disease. Here, we tested the hypothesis that Staphylococcus aureus enterotoxin B (SEB), a model SAg, can alter epithelial transport and/or barrier functions via immune stimulation. Confluent monolayers of the human colonic T84 epithelial cell line, grown on filter supports, were cocultured with SEB +/- PBMC. Subsequently, T84 transport (consisting of baseline short-circuit current (Isc, indicates net ion transport) and secretory responses to carbachol and forskolin) and barrier functions (consisting of transepithelial resistance and fluxes of 3H-labeled mannitol and 51Cr-EDTA) were examined in Ussing chambers. T84 monolayers cocultured with SEB-activated PBMC displayed a time- and dose-dependent decrease in secretory responses to carbachol and forskolin and a significant increase in permeability. These dramatic changes in epithelial function were not due to reduced epithelial viability. Neutralizing Abs to IFN-gamma partially prevented the transport abnormalities, and Abs to TNF-alpha inhibited the increase in epithelial permeability. Abs to IL-1beta and IL-6 did not modulate the SEB-activated PBMC-induced T84 pathophysiology. Addition of TGF-beta2 to conditioned medium from SEB-activated PBMC partially inhibited the increase in T84 permeability but did not affect the transport abnormalities. We conclude that SAgs can elicit epithelial irregularities characteristic of enteric inflammation and that IFN-gamma and TNF-alpha are key mediators in this coculture model of epithelial dysfunction. Additionally, we would highlight the role that TGF-beta2 may play in preventing prolonged increases in epithelial permeability. 相似文献
107.
108.
109.
110.
JH Pruett KB Temeyer WF Fisher PK Beetham SE Kunz 《Canadian Metallurgical Quarterly》1998,35(5):861-871
In this study potential vaccine candidate immunogens were identified and evaluated in a vaccine challenge trial. Calves vaccinated with a partially purified fraction of Psoroptes ovis-soluble proteins had 8 of 14 calves free of palpable lesions 8 wk after a challenge infestation. A self-grooming behavioral response elicited by a pruritic immediate-type allergic reaction was believed to be an effector in protecting the vaccinated calves from a clinical P. ovis infestation. 相似文献