全文获取类型
收费全文 | 1430篇 |
免费 | 28篇 |
专业分类
电工技术 | 7篇 |
化学工业 | 225篇 |
金属工艺 | 6篇 |
机械仪表 | 27篇 |
建筑科学 | 93篇 |
矿业工程 | 4篇 |
能源动力 | 54篇 |
轻工业 | 147篇 |
水利工程 | 13篇 |
石油天然气 | 4篇 |
无线电 | 82篇 |
一般工业技术 | 145篇 |
冶金工业 | 437篇 |
原子能技术 | 5篇 |
自动化技术 | 209篇 |
出版年
2023年 | 8篇 |
2022年 | 29篇 |
2021年 | 32篇 |
2020年 | 25篇 |
2019年 | 24篇 |
2018年 | 18篇 |
2017年 | 19篇 |
2016年 | 32篇 |
2015年 | 31篇 |
2014年 | 37篇 |
2013年 | 72篇 |
2012年 | 56篇 |
2011年 | 84篇 |
2010年 | 64篇 |
2009年 | 67篇 |
2008年 | 69篇 |
2007年 | 60篇 |
2006年 | 63篇 |
2005年 | 35篇 |
2004年 | 37篇 |
2003年 | 30篇 |
2002年 | 44篇 |
2001年 | 28篇 |
2000年 | 15篇 |
1999年 | 31篇 |
1998年 | 17篇 |
1997年 | 12篇 |
1996年 | 18篇 |
1995年 | 24篇 |
1994年 | 25篇 |
1993年 | 29篇 |
1992年 | 24篇 |
1990年 | 23篇 |
1989年 | 13篇 |
1988年 | 19篇 |
1987年 | 22篇 |
1986年 | 15篇 |
1985年 | 24篇 |
1984年 | 20篇 |
1983年 | 15篇 |
1982年 | 17篇 |
1980年 | 12篇 |
1979年 | 12篇 |
1978年 | 10篇 |
1977年 | 9篇 |
1976年 | 7篇 |
1975年 | 11篇 |
1974年 | 9篇 |
1973年 | 10篇 |
1969年 | 6篇 |
排序方式: 共有1458条查询结果,搜索用时 15 毫秒
81.
It is generally argued that parental use of specific discipline techniques (e.g., reasoning vs power assertion) differentially affects a child's internalization. This article offers an expanded formulation. Internalization as a result of discipline is proposed to be based on a child's accurate perception of the parental message and acceptance or rejection of it. Mechanisms promoting acceptance are perceptions of the parent's actions as appropriate, motivation to accept the parental position, and perception that a value has been self-generated. Features of the misdeed, discipline technique, child, and parent that affect accurate perception and acceptance–rejection are outlined. Other goals besides internalization, such as movement beyond the parent's position, maintenance of the child's self-esteem, and maintenance of the parent–child relationship, are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
82.
83.
ABSTRACT This paper reviews the results obtained by studying the dual-temperature ion-exchange fractionation (DTIXF) technique. The DTIXF is based on the use of different affinity at different temperatures of ion exchangers towards ions to be separated. This technique allows to design absolutely reagentless and, as a result, wasteless fractionation technology. The review considers the temperature dependencies of selectivity of commercially available ion-exchange (LX) resins towards components of ionic mixtures of different complexity starting from binary model systems up to naturally existing nonacomponent effluents. A novel approach for predicting the temperature sensitivity of a given LX system is presented and discussed. The same approach has been shown to be applicable for the design of IX resins with temperature-dependent selectivity. The paper also reports the results obtained in the practical application of DTIXF technique for concentration of magnesium from seawater and copper from acidic mine waters. The flowsheets of DTLXF processes are proposed and discussed. 相似文献
84.
85.
Gravel constitutes the filter medium in subsurface flow constructed wetlands (SSF CWs) and its porosity and hydraulic conductivity decrease over time (clogging), limiting the lifespan of the systems. Using gravel of poor quality accelerates clogging in wetlands. In this study, gravel samples from six different wetland systems were compared with regards to their mineral composition and mechanical resistance properties. Results showed that both mineralogy and texture are related to mechanical resistance. Accordingly, gravel with high content of quartz (> 80%) showed a lower percentage of broken particles (0.18-1.03%) than those with lower content of quartz (2.42-4.56% media broken). Although granite is formed by high durability minerals, its non-uniform texture results in a lower resistance to abrasion (ca. 10% less resistance than calcareous gravel). Therefore, it is recommended to use gravels composed mainly of quartz or, when it is not available, limestone gravels (rounded and uniform) are recommended instead. The resistance to abrasion (LAA test) seems to be a good indicator to determine the mechanical properties of gravels used in CWs. It is recommended to use gravels with LAA below 30% in order to avoid a rapid clogging due to gravel crumbling and subsequent mineral solids accumulation. 相似文献
86.
Phantipha Charoenthaikij Kamolwan Jangchud Anuvat Jangchud Witoon Prinyawiwatkul Hong Kyoon No Joan M. King 《Journal of food science》2010,75(6):S333-S339
Abstract: Selected physicochemical properties and consumer acceptance of bread prepared from composite flour (wheat:germinated brown rice:germinated glutinous brown rice flours at 60:30:10 ratio) were evaluated during storage for 0, 3, and 5 d, and compared with wheat bread (0 d, control). During storage, color profiles and water activity (from 0.947 to 0.932) of crumbs of composite flour breads slightly changed, but moisture content drastically decreased along with increasing crumb hardness (from 4.16 N to 10.37 N). Higher retrogradation in bread crumb was observed particularly for 5-d stored bread (ΔH = 2.24 J/g) compared to that of the fresh composite bread and the control (ΔH = 0.70 and 0.51 J/g, respectively). Mean (n = 116) overall liking score of the fresh composite flour bread (0 d) was slightly lower than that of the control (7.1 compared with 7.6 based on a 9-point hedonic scale). At least 76% of consumers would purchase the fresh composite flour bread if commercially available. Breads were differentiated by textural (moistness, smoothness, and softness) acceptability with canonical correlation of 0.84 to 0.87. The signal-to-noise ratio values of the 5-d stored breads were lower than the control, due mainly to the non-JAR (not-enough) intensity responses for moistness, smoothness, and softness; the mean drop of liking scores for these attributes ranged from 2.42 to 2.98. Flavor acceptability and overall liking were factors influencing consumers’ purchase intent of composite flour breads based on logistic regression analysis. This study demonstrated feasibility of incorporating up to 40% germinated brown rice flour in a wheat bread formulation. Practical Application: Our previous study revealed that flours from germinated brown rice have better nutritional properties, particularly gamma-aminobutyric acid (GABA), than the nongerminated one. This study demonstrated feasibility of incorporating up to 40% germinated brown rice flour in a wheat bread formulation. In the current U.S. market, this type of bread may be sold as frozen bread that would have a longer shelf life, or may be supplied as a food-service product that would be made-to-order or made fresh daily as currently practiced in some major grocery stores. 相似文献
87.
Joan Papavasiliou George Avgouropoulos Theophilos Ioannides 《Applied catalysis. B, Environmental》2007,69(3-4):226-234
Steam reforming of methanol was carried out over a series of doped CuO–CeO2 catalysts prepared via the urea–nitrate combustion method. XRD analysis showed that at least part of the dopant cations enter the ceria lattice. The addition of various metal oxide dopants in the catalyst composition affected in a different way the catalytic performance towards H2 production. Small amounts of oxides of Sm and Zn improved the performance of CuO–CeO2, while further addition of these oxides caused a decrease in catalyst activity. XPS analysis of Zn- and Sm-doped catalysts showed that increase of dopant loading leads to surface segregation of the dopant and decrease of copper oxide dispersion. The addition of oxides of La, Zr, Mg, Gd, Y or Ca lowered or had no effect on catalytic activity, but led to less CO in the reaction products. Noble-metal modified catalysts had slightly higher activity, but the CO selectivity was also significantly higher. 相似文献
88.
Teresa Auguet Alba Berlanga Esther Guiu-Jurado Salomé Martinez José Antonio Porras Gemma Aragonès Fátima Sabench Mercé Hernandez Carmen Aguilar Joan Josep Sirvent Daniel Del Castillo Cristóbal Richart 《International journal of molecular sciences》2014,15(12):22173-22187
Lipid accumulation in the human liver seems to be a crucial mechanism in the pathogenesis and the progression of non-alcoholic fatty liver disease (NAFLD). We aimed to evaluate gene expression of different fatty acid (FA) metabolism-related genes in morbidly obese (MO) women with NAFLD. Liver expression of key genes related to de novo FA synthesis (LXRα, SREBP1c, ACC1, FAS), FA uptake and transport (PPARγ, CD36, FABP4), FA oxidation (PPARα), and inflammation (IL6, TNFα, CRP, PPARδ) were assessed by RT-qPCR in 127 MO women with normal liver histology (NL, n = 13), simple steatosis (SS, n = 47) and non-alcoholic steatohepatitis (NASH, n = 67). Liver FAS mRNA expression was significantly higher in MO NAFLD women with both SS and NASH compared to those with NL (p = 0.003, p = 0.010, respectively). Hepatic IL6 and TNFα mRNA expression was higher in NASH than in SS subjects (p = 0.033, p = 0.050, respectively). Interestingly, LXRα, ACC1 and FAS expression had an inverse relation with the grade of steatosis. These results were confirmed by western blot analysis. In conclusion, our results indicate that lipogenesis seems to be downregulated in advanced stages of SS, suggesting that, in this type of extreme obesity, the deregulation of the lipogenic pathway might be associated with the severity of steatosis. 相似文献
89.
The production of a lead glaze with galena: Thermal transformations in the PbS–SiO2 system 下载免费PDF全文
Roberta Di Febo Judit Molera Trinitat Pradell Joan C. Melgarejo Josep Madrenas Oriol Vallcorba 《Journal of the American Ceramic Society》2018,101(5):2119-2129
Galena, also known as PbS, was widely used in the production of lead glazes from the beginning of the 18th century to the second half of the 20th century. Although the PbO‐SiO2 system has been studied for years, the PbS–SiO2 phase diagram, involved in the formation of a glaze with galena, has not yet been investigated. Temperature transformations for the system 75 wt% PbS‐25 wt% SiO2 are investigated in a high‐temperature resolved X‐ray diffraction experiment with synchrotron radiation and compared to those of the equivalent system 70 wt% PbO‐30 wt% SiO2. Lanarkite, PbO·PbSO4, is the phase predominantly formed as soon as galena decomposes during the heating. The results show that the system melts at a temperature higher than the PbO–SiO2 system, but far lower than those expected for the PbO–PbSO4–PbS system. A historical misfired lead glaze produced with galena is also studied. The presence of galena, lanarkite, and mattheddleite, Pb10(SiO4)3.5(SO4)2Cl2, is determined and discussed in terms of the composition of the galena mineral used and the firing conditions in light of the high‐temperature transformations previously obtained. 相似文献
90.
The tightly localized noradrenergic neurons (NA) in the locus coeruleus (LC) are well recognized as essential for focused arousal and novelty-oriented responses, while many children with autism spectrum disorder (ASD) exhibit diminished attention, engagement and orienting to exogenous stimuli. This has led to the hypothesis that atypical LC activity may be involved in ASD. Oxytocin (OXT) neurons and receptors are known to play an important role in social behavior, pair bonding and cognitive processes and are under investigation as a potential treatment for ASD. However, little is known about the neurotransmission from hypothalamic paraventricular (PVN) OXT neurons to LC NA neurons. In this study, we test, in male and female rats, whether PVN OXT neurons excite LC neurons, whether oxytocin is released and involved in this neurotransmission, and whether activation of PVN OXT neurons alters novel object recognition. Using “oxytocin sniffer cells” (CHO cells that express the human oxytocin receptor and a Ca indicator) we show that there is release of OXT from hypothalamic PVN OXT fibers in the LC. Optogenetic excitation of PVN OXT fibers excites LC NA neurons by co-release of OXT and glutamate, and this neurotransmission is greater in males than females. In male, but not in female animals, chemogenetic activation of PVN OXT neurons increases attention to novel objects. 相似文献