全文获取类型
收费全文 | 176篇 |
免费 | 7篇 |
专业分类
化学工业 | 49篇 |
金属工艺 | 2篇 |
机械仪表 | 2篇 |
建筑科学 | 9篇 |
矿业工程 | 1篇 |
能源动力 | 7篇 |
轻工业 | 22篇 |
无线电 | 8篇 |
一般工业技术 | 27篇 |
冶金工业 | 39篇 |
自动化技术 | 17篇 |
出版年
2024年 | 3篇 |
2023年 | 2篇 |
2022年 | 4篇 |
2021年 | 10篇 |
2020年 | 4篇 |
2019年 | 8篇 |
2018年 | 3篇 |
2017年 | 3篇 |
2016年 | 2篇 |
2015年 | 6篇 |
2014年 | 5篇 |
2013年 | 18篇 |
2012年 | 7篇 |
2011年 | 7篇 |
2010年 | 10篇 |
2009年 | 7篇 |
2008年 | 8篇 |
2007年 | 6篇 |
2006年 | 6篇 |
2005年 | 6篇 |
2004年 | 10篇 |
2003年 | 4篇 |
2002年 | 4篇 |
2001年 | 2篇 |
1999年 | 2篇 |
1998年 | 3篇 |
1997年 | 5篇 |
1996年 | 5篇 |
1995年 | 1篇 |
1994年 | 3篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1987年 | 4篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1965年 | 1篇 |
排序方式: 共有183条查询结果,搜索用时 15 毫秒
71.
Cole Jason C.; Rabin Adele S.; Smith Tom L.; Kaufman Alan S. 《Canadian Metallurgical Quarterly》2004,16(4):360
The current study presents a Rasch-derived short form of the Center for Epidemiologic Studies-Depression scale (CES-D) for use as a depression screening tool in the general population. In contrast to short forms developed with reliance on classical measurement techniques, those developed using techniques based on item response theory produce a measure that offers true interval scaling, provide enhanced information about responders with extreme scores, and expand understanding of the underlying latent structure. Cross-validation of the Rasch-derived CES-D short form supported its utility and structural validity across samples. Tests of structural validity using latent variable modeling methodology indicated that a hierarchical, single-factor model of depression had the best fit for the original full form and the Rasch-derived short form of the CES-D. This finding challenges depression researchers and theorists to reconsider the interfactor relationships in the study and assessment of depression. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
72.
Isara Wattananapakasem Hein J. F. van Valenberg Vincenzo Fogliano Adele Costabile Prisana Suwannaporn 《Food and Bioprocess Technology》2018,11(6):1111-1124
Lactobacillus plantarum was encapsulated by slowly digestible hydrolyzed heat-moisture-treated (hydrolyzed-HMT) black waxy rice and applied in yoghurt. Incorporating these microcapsules in yoghurt resulted in higher viability of Lactobacillus bulgaricus C49 and Streptococcus thermophilus C44, especially in prolonged storage. The viability of L. bulgaricus and S. thermophilus (7.98 and 8.28 Log CFU/g) in synbiotic yoghurt was higher than in the control (7.81 and 7.96 Log CFU/g). Thirty-two aromatic compounds were detected and classified into 4 groups: alcohols, carbonyls, organic acids, and sulfur. Synbiotic yoghurt produced higher carbonyl compounds, particularly acetaldehyde and diacetyl. On the other hand, higher organic acid especially hexanoic, dodecanoic, acetic, butanoic, and pentanoic acids was observed at the end of fermentation but did not differ from control after storage. Ethanol was also higher in the synbiotic yoghurt due to the breakdown of glucose from starch and acetaldehyde by lactic acid bacteria. Weak correlation was found concerning sulfur compounds. Rice starch granules were aggregated and still retained its hexagonal shape, indicating high resistance to acid fermentation during 28 days of storage. The resistant starch coating from rice could provide a good prebiotic ingredient and allow the design of synbiotic yoghurt with enhanced aroma. 相似文献
73.
Fondelli MC Bavazzano P Grechi D Gorini G Miligi L Marchese G Cenni I Scala D Chellini E Costantini AS 《The Science of the total environment》2008,392(1):41-49
OBJECTIVE: Personal exposure to airborne benzene is influenced by various outdoor and indoor sources. The first aim of this study was to assess the benzene exposure of a sample of urban inhabitants living in an inner-city neighborhood of Florence, Italy, excluding exposure from active smoking. The secondary objective was to differentiate the personal exposures according to personal usage patterns of the vehicles. METHODS: A sample of 67 healthy non-smokers was monitored by passive samplers during two 4-weekday campaigns in winter and late spring. Simultaneously, benzene measurements were also taken for a subset of participants, inside and outside their houses. A 4-day time microenvironment activity diary was completed by each subject during each sampling period. Other relevant exposure data were collected by a questionnaire before the sampling. Additional data on urban ambient air benzene levels were also available from the public air quality network. The passive samplers, after automated thermal desorption, were analyzed by GC-FID. RESULTS: Benzene personal exposure levels averaged 6.9 (SD=2.1) and 2.3 (SD=0.7) microg/m(3) in winter and spring, respectively. Outdoor and indoor levels showed high correlation in winter and poor in spring. In winter the highest benzene personal exposure levels were for people traveling by more public transport, followed by users of only car and by users of only bus respectively. CONCLUSIONS: The time spent in-transport for work or leisure makes a major contribution to benzene exposure among Florentine non-smoking citizens. Indoor pollution and transportation means contribute significantly to individual exposure levels especially in winter season. 相似文献
74.
John G Hagedorn Judith E Terrill Adele P Peskin James J Filliben 《Journal of research of the National Institute of Standards and Technology》2008,113(4):221-238
We present methods for measuring errors in the rendering of three-dimensional points, line segments, and polygons in pixel-based computer graphics systems. We present error metrics for each of these three cases. These methods are applied to rendering with OpenGL on two common hardware platforms under several rendering conditions. Results are presented and differences in measured errors are analyzed and characterized. We discuss possible extensions of this error analysis approach to other aspects of the process of generating visual representations of synthetic scenes. 相似文献
75.
Ivan Casaburi Francesco Puoci Adele Chimento Rosa Sirianni Carmen Ruggiero Paola Avena Vincenzo Pezzi 《Molecular nutrition & food research》2013,57(1):71-83
Olive oil is a common component of Mediterranean dietary habits. Epidemiological studies have shown how the incidence of various diseases, including certain cancers, is relatively low in the Mediterranean basin compared to that of other European or North America countries. Current knowledge indicates that the phenolic fraction of olive oil has antitumor effects. In addition to the ability to be chemopreventive, with its high antioxidant activity, the antitumor effects of olive oil phenols (OO‐phenols) has been studied because of their capacity to inhibit proliferation and promote apoptosis in several tumor cell lines, by diverse mechanisms. This review will summarize and discuss the most recent relevant results on the antitumor effect of OO‐phenols on leukemia tumor cells, colorectal carcinoma cells, and breast cancer (BC) cells. In particular, very recent data will be reported and discussed showing the molecular signaling pathways activated by OO‐phenols in different histopathological BC cell types, suggesting the potential use of OO‐phenols as adjuvant treatment against several subsets of BC. Data summarized here represent a good starting point for more extensive studies for better insight into the molecular mechanisms induced by OO‐phenols and to increase the availability of chemopreventive or therapeutic drugs to fight cancer. 相似文献
76.
Andrea Colantoni Efstathios Grigoriadis Adele Sateriano Efthymia Sarantakou 《International Planning Studies》2017,22(3):173-188
This study assesses trends (1960–2010) in forest cover over a Mediterranean metropolitan region (Attica, Greece) with the aim to investigate the role of local contexts promoting changes in the use of land. Forest cover decreased in a spatially heterogeneous manner over the study period determining a land-use structure coherent with the Von Thunen mono-centric model. We used a multivariate exploratory analysis of 26 contextual variables to identify changes in the urban spatial structure at the local scale. The shift from a land-use structure based on urban–rural and cropland-forest polarizations in the early 1960s to a pattern based on the polarization in medium-density, mixed urban/agricultural areas and low-density, sparse forest land has been observed in the last 50 years. Urban expansion into rural land and the establishment of protected areas in economically marginal and remote districts has been identified as relevant drivers of landscape transformation in the area. Our study demonstrates that land-use changes driven by expansion of dispersed settlements may consolidate mono-centric urban structures. A concentric land-use distribution around the central city is compatible with urban sprawl and may be indirectly supported by ‘green belt’ regional planning and environmental policies protecting high-quality natural land. 相似文献
77.
Diamond Adele; Churchland Anne; Cruess Loren; Kirkham Natasha Z. 《Canadian Metallurgical Quarterly》1999,35(6):1507
Delayed nonmatching to sample (DNMS) is used to test the recognition memory function dependent on the medial temporal lobe. Children cannot succeed on this task until about 21 months. Because robust recognition is present well before then, the late emergence of another ability must account for the late success on DNMS. Evidence is presented here that the critical late-maturing confidence is the ability to grasp the relation between stimulus and reward—that is, to understand that the stimulus is a symbol or marker for the reward. Infants of 9 and 12 months were tested on 3 conditions of DNMS. A sample object was presented. After a delay, the sample and a novel object appeared; choice of the novel object was rewarded. In the standard task, the reward was in a well beneath the stimulus. In the verbal-reward condition the reward was not a separate object but was praise and applause. In the Velcro condition, the reward, although a separate and separable object, was attached to the base of the stimulus. Most infants at both ages succeeded in the verbal-reward and Velcro conditions but not in the standard condition. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
78.
Ilaria Cela Maria Concetta Cufaro Maurine Fucito Damiana Pieragostino Paola Lanuti Michele Sallese Piero Del Boccio Adele Di Matteo Nerino Allocati Vincenzo De Laurenzi Luca Federici 《International journal of molecular sciences》2022,23(14)
Nucleostemin (NS; a product of the GNL3 gene) is a nucleolar–nucleoplasm shuttling GTPase whose levels are high in stem cells and rapidly decrease upon differentiation. NS levels are also high in several solid and hematological neoplasms, including acute myeloid leukaemia (AML). While a role in telomere maintenance, response to stress stimuli and favoring DNA repair has been proposed in solid cancers, little or no information is available as to the role of nucleostemin in AML. Here, we investigate this issue via a proteomics approach. We use as a model system the OCI-AML 3 cell line harboring a heterozygous mutation at the NPM1 gene, which is the most frequent driver mutation in AML (approximately 30% of total AML cases). We show that NS is highly expressed in this cell line, and, contrary to what has previously been shown in other cancers, that its presence is dispensable for cell growth and viability. However, proteomics analysis of the OCI-AML 3 cell line before and after nucleostemin (NS) silencing showed several effects on different biological functions, as highlighted by ingenuity pathway analysis (IPA). In particular, we report an effect of down-regulating DNA repair through homologous recombination, and we confirmed a higher DNA damage rate in OCI-AML 3 cells when NS is depleted, which considerably increases upon stress induced by the topoisomerase II inhibitor etoposide. The data used are available via ProteomeXchange with the identifier PXD034012. 相似文献
79.
80.