全文获取类型
收费全文 | 464篇 |
免费 | 40篇 |
专业分类
电工技术 | 2篇 |
综合类 | 1篇 |
化学工业 | 143篇 |
金属工艺 | 3篇 |
机械仪表 | 19篇 |
建筑科学 | 23篇 |
能源动力 | 24篇 |
轻工业 | 134篇 |
水利工程 | 1篇 |
石油天然气 | 5篇 |
无线电 | 17篇 |
一般工业技术 | 51篇 |
冶金工业 | 6篇 |
原子能技术 | 3篇 |
自动化技术 | 72篇 |
出版年
2024年 | 2篇 |
2023年 | 9篇 |
2022年 | 26篇 |
2021年 | 29篇 |
2020年 | 19篇 |
2019年 | 24篇 |
2018年 | 12篇 |
2017年 | 14篇 |
2016年 | 21篇 |
2015年 | 20篇 |
2014年 | 31篇 |
2013年 | 30篇 |
2012年 | 46篇 |
2011年 | 42篇 |
2010年 | 27篇 |
2009年 | 36篇 |
2008年 | 28篇 |
2007年 | 14篇 |
2006年 | 6篇 |
2005年 | 17篇 |
2004年 | 9篇 |
2003年 | 9篇 |
2002年 | 6篇 |
2001年 | 4篇 |
2000年 | 1篇 |
1999年 | 3篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 3篇 |
1995年 | 3篇 |
1994年 | 3篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1985年 | 3篇 |
排序方式: 共有504条查询结果,搜索用时 11 毫秒
1.
Gabriela Pitolli Lyra Valdemir Santos Eliria Maria de Jesus Agnolon Pallone Ruth Herta Goldschmidt Aliaga Kiminami Bruno Carlos De Santis João Adriano Rossignolo 《International Journal of Applied Ceramic Technology》2021,18(3):705-715
This work aimed to examine the performance of the hybrid sintering of clay ceramic in a microwave furnace, compared to the sintering process in a conventional furnace. The raw materials were subjected to X-ray fluorescence, loss on ignition (LOI), X-ray diffraction, particle size distribution, real specific mass, and thermogravimetric analyses. The red clay ceramic mass was prepared, extruded, pre-sintered in a conventional furnace at 600°C/60 min, and sintered at temperatures between 700 °C and 1100 °C. The sintering conventional (resistive oven) was carried out for 60 min with a heating rate of 10°C/min. In the microwave furnace, the sintering times were 5, 10, and 15 min, with a heating rate of 50°C/min, with a sintering chamber coated with silicon carbide (susceptor). The sintered specimens were characterized according to linear shrinkage, water absorption, apparent porosity, apparent specific mass, X-ray diffraction, Raman spectroscopy analysis, spectroscopy analysis in the ultraviolet and visible regions, microhardness, and scanning electron microscopy. The results showed that microwave sintering promoted an increase in the microhardness and apparent specific mass, and reduction in water absorption and apparent porosity values, due to greater densification in the microstructure. The best results occurred for specimens sintered at 1100°C. 相似文献
2.
Adriano Gomes Alexandre Mota Augusto Sampaio Felipe Ferri Edson Watanabe 《International Journal on Software Tools for Technology Transfer (STTT)》2012,14(6):673-702
The aerospace industry still uses fault trees to perform reliability analysis. This is because fault-tree modeling and analysis (FTA) seems easier to practical engineers when compared with Markov models, even though FTA provides a weaker form of analysis. In this paper, we propose an automatic strategy for generating Markov-based models and corresponding analysis formulations, according to ARP 4761, directly from Simulink diagrams annotated with failure information. The generated Markov-based models are expressed in the formal language PRISM, and the analysis is carried out by the PRISM model checker. The strategy is compositional and based on a comprehensive set of translation rules from Simulink to PRISM. We briefly address soundness and completeness of the rules and, to illustrate the application of the strategy, we apply it to a classical avionics case study: an actuator control system. 相似文献
3.
Marcos R. Guilherme Adriano V. Reis Alexandre T. Paulino André R. Fajardo Edvani C. Muniz Elias B. Tambourgi 《应用聚合物科学杂志》2007,105(5):2903-2909
This contribution describes the absorption percentage of Pb2+ and Cu2+ from water by a superabsorbent hydrogel matrix (SH) made from an anionic polysaccharide copolymerized with acrylic acid (AAc) and acrylamide (AAm). Metal‐absorption tests, upon sequential pH variation, indicated that the SH has pH‐sensitivity for the absorption of both metals from solution, attributed to the functional ionic groups (? COOH) present in the AAc and arabic gum (AG) segments. At the pH 5.0, the SH exhibited good absorption capacity: 73.10% for Pb2+, 81.99% for Cu2+ in water and 63.64% for Pb2+, and 76.67% for Cu2+ in saline water with 0.1 mol kg?1 ionic strength. A replicated 22 full factorial design with a central point was built to evaluate the maximum absorption capacity of the metals into the SH. It was found that both the interaction and main effects of the pH and the initial concentration of metal solution on absorption percentage of the metals were statistically significant. Surface response plots indicated that the absorption capacity of both metals into the SH may be appreciably improved by using the solutions with lower initial concentration of metal and with higher pH values. Metal‐absorption results demonstrated that the SH is a convenient material for absorption of Pb2+ and Cu2+ from pure aqueous and saline aqueous environments. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007 相似文献
4.
Massa Lucas Barbosa Adriano Oliveira Krerley Vieira Thales 《Multimedia Tools and Applications》2021,80(4):5517-5537
Multimedia Tools and Applications - Measuring and analyzing the flow of customers in retail stores is essential for a retailer to better comprehend customers’ behavior and support... 相似文献
5.
6.
Felix M. Escalante Andres L. Jutinico Marco H. Terra Adriano A. G. Siqueira 《Asian journal of control》2023,25(4):2564-2576
The natural instability of an inverted pendulum and its dynamics richness, in terms of nonlinearity, provide a nice apparatus to reproduce behaviors of analogous systems. In this way, it is useful to perform benchmark tests for new control approaches developed. In this paper, we address the main inverted pendulum problems: pendulum stabilization, tracking, and catching swing-up control. We show how robust recursive, control and filtering, techniques improve the system performance. They are developed to solve stochastic problems based on deterministic approaches, in order to decrease the worst influence of uncertainties. Experimental results of the proposed robust approach provide robust stability and performance despite parametric uncertainties, disturbances, and noise effects. 相似文献
7.
Coordination components for collaborative virtual environments 总被引:1,自引:0,他引:1
Alberto B. Raposo Adailton J. A. da Cruz Christian M. Adriano Lo P. Magalhes 《Computers & Graphics》2001,25(6):1025-1039
This paper deals with the behavior of virtual environments from the collaboration point-of-view, in which actors (human or virtual beings) interact and collaborate by means of interdependent tasks. In this sense, actors may realize tasks that are dependent on tasks performed by other actors, while the interdependencies between tasks (through resource management and temporal relations) delineate the overall behavior of a virtual environment. Our main goal is to propose an approach for the coordination of those behaviors. Initially a generic study of possible interdependencies between collaborative tasks is presented, followed by the formal modeling (using Petri Nets) of coordination mechanisms for those dependencies. In order to implement such mechanisms, an architecture of reusable and pluggable coordination components is also introduced. These components are used in an implementation of a multi-user videogame. The presented approach is a concrete step to create virtual societies of actors that collaborate to reach common goals without the risk of getting involved in conflicting or repetitive tasks. 相似文献
8.
Summary We assessed the contribution of Brazilian limnologists (freshwater ecologists) in international journals in the period 1970-2004.
Brazilian contribution was low and regular in the 1970's, but increased steeply after 1980 with no signs of stabilization
until the present. Articles authored by Brazilians tend to be less cited than articles authored by non-Brazilians, although
this difference is reduced in co-authored articles with international researchers. Brazilian articles are not distributed
homogenously among the sub-areas of Limnology, but present some biases that can be explained by intellectual legacy. Brazil
has invested since the 1970's in establishing postgraduate courses in Brazil and in the last years has turned the focus to
a better qualification of these courses. We believe these are the main reasons for the conspicuous development of Brazilian
Limnology. 相似文献
9.
Giulia Minniti Letícia Maria Pescinini-Salzedas Guilherme Almeida dos Santos Minniti Lucas Fornari Laurindo Sandra Maria Barbalho Renata Vargas Sinatora Lance Alan Sloan Rafael Santos de Argollo Haber Adriano Cressoni Araújo Karina Quesada Jesselina F. dos Santos Haber Marcelo Dib Bechara Katia Portero Sloan 《International journal of molecular sciences》2022,23(21)
Sarcopenia is a disease that becomes more prevalent as the population ages, since it is directly linked to the process of senility, which courses with muscle atrophy and loss of muscle strength. Over time, sarcopenia is linked to obesity, being known as sarcopenic obesity, and leads to other metabolic changes. At the molecular level, organokines act on different tissues and can improve or harm sarcopenia. It all depends on their production process, which is associated with factors such as physical exercise, the aging process, and metabolic diseases. Because of the seriousness of these repercussions, the aim of this literature review is to conduct a review on the relationship between organokines, sarcopenia, diabetes, and other metabolic repercussions, as well the role of physical exercise. To build this review, PubMed-Medline, Embase, and COCHRANE databases were searched, and only studies written in English were included. It was observed that myokines, adipokines, hepatokines, and osteokines had direct impacts on the pathophysiology of sarcopenia and its metabolic repercussions. Therefore, knowing how organokines act is very important to know their impacts on age, disease prevention, and how they can be related to the prevention of muscle loss. 相似文献
10.
Mariana Toledo Gonalves Moreira Patricia Ribeiro Pereira Adriano Aquino Carlos Adam Conte-Junior Vania Margaret Flosi Paschoalin 《International journal of molecular sciences》2022,23(22)
Aldehydes, particularly acetaldehyde, are carcinogenic molecules and their concentrations in foodstuffs should be controlled to avoid upper aerodigestive tract (UADT) and liver cancers. Highly reactive, acetaldehyde forms DNA and protein adducts, impairing physiological functions and leading to the development of pathological conditions. The consumption of aged beer, outside of the ethanol metabolism, exposes habitual drinkers to this carcinogen, whose concentrations can be over-increased due to post-brewing chemical and biochemical reactions. Storage-related changes are a challenge faced by the brewing industry, impacting volatile compound formation and triggering flavor instability. Aldehydes are among the volatile compounds formed during beer aging, recognized as off-flavor compounds. To track and understand aldehyde formation through multiple pathways during beer storage, consequent changes in flavor but particularly quality losses and harmful compound formation, this systematic review reunited data on volatile compound profiles through gas chromatography analyses from 2011 to 2021. Conditions to avoid flavor instability and successful methods for reducing beer staling, and consequent acetaldehyde accumulation, were raised by exploring the dynamic conversion between free and bound-state aldehydes. Future research should focus on implementing sensory analyses to investigate whether adding aldehyde-binding agents, e.g., cysteine and bisulfite, would contribute to consumer acceptance, restore beer flavor, and minimize acetaldehyde-related health damage. 相似文献