全文获取类型
收费全文 | 185篇 |
免费 | 10篇 |
专业分类
电工技术 | 1篇 |
化学工业 | 26篇 |
金属工艺 | 8篇 |
机械仪表 | 4篇 |
建筑科学 | 14篇 |
能源动力 | 20篇 |
轻工业 | 3篇 |
水利工程 | 5篇 |
石油天然气 | 4篇 |
无线电 | 38篇 |
一般工业技术 | 23篇 |
冶金工业 | 13篇 |
原子能技术 | 1篇 |
自动化技术 | 35篇 |
出版年
2023年 | 5篇 |
2022年 | 8篇 |
2021年 | 13篇 |
2020年 | 3篇 |
2019年 | 3篇 |
2018年 | 9篇 |
2017年 | 2篇 |
2016年 | 7篇 |
2015年 | 10篇 |
2014年 | 5篇 |
2013年 | 17篇 |
2012年 | 6篇 |
2011年 | 18篇 |
2010年 | 7篇 |
2009年 | 17篇 |
2008年 | 8篇 |
2007年 | 7篇 |
2006年 | 2篇 |
2005年 | 5篇 |
2004年 | 6篇 |
2003年 | 3篇 |
2002年 | 3篇 |
2001年 | 1篇 |
2000年 | 4篇 |
1999年 | 2篇 |
1998年 | 4篇 |
1997年 | 4篇 |
1996年 | 1篇 |
1995年 | 6篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1984年 | 1篇 |
1983年 | 2篇 |
排序方式: 共有195条查询结果,搜索用时 0 毫秒
11.
Amir Alipour Skandani Ayoub Yari Boroujeni Roozbeh Kalhor Scott W. Case Marwan Al‐Haik 《Polymer Composites》2015,36(11):1967-1972
The insufficient viscoelastic resistance of fiber reinforced plastics can be retrofitted by the addition of more rigid nano fillers to the polymer matrix. In this study, carbon fibers plies were grafted with zinc oxide (ZnO) nano‐rods and the hybridized reinforcement was utilized in laminated composites. Flexural creep tests were carried out using dynamic mechanical analysis (DMA) and the time/temperature superposition principle was employed for accelerated testing. To verify the applicability of TTPS, prolonged stress relaxation tests were also carried out in flexural mode. Data from the DMA flexural creep tests revealed that the whiskerization of carbon fibers with ZnO nano rods reduced the creep compliance by 23% at elevated temperatures and prolonged durations. Also, the relaxation data confirmed the applicability of TTPS to these hybrid composites. The stress relaxation modulus improved by 65% in comparison to composites based on neat carbon fibers. POLYM. COMPOS., 36:1967–1972, 2015. © 2014 Society of Plastics Engineer 相似文献
12.
Hala Skayneh Batoul Jishi Rita Hleihel Maguy Hamie Rana El Hajj Carine Deleuze-Masquefa Pierre-Antoine Bonnet Marwan El Sabban Hiba El Hajj 《International journal of molecular sciences》2022,23(7)
Nucleophosmin-1 (NPM1) is a pleiotropic protein involved in numerous cellular processes. NPM1 shuttles between the nucleus and the cytoplasm, but exhibits a predominant nucleolar localization, where its fate and functions are exquisitely controlled by dynamic post-translational modifications (PTM). Sentrin/SUMO Specific Peptidase 3 (SENP3) and ARF are two nucleolar proteins involved in NPM1 PTMs. SENP3 antagonizes ARF-mediated NPM1 SUMOylation, to promote ribosomal biogenesis. In Acute Myeloid Leukemia (AML), NPM1 is frequently mutated, and exhibits an aberrant cytoplasmic localization (NPM1c). NPM1c mutations define a separate AML entity with good prognosis in some AML patients, rendering NPM1c as a potential therapeutic target. SENP3-mediated NPM1 de-SUMOylation induces resistance to therapy in NPM1c AML. Here, we demonstrate that the imidazoquinoxaline EAPB0503 prolongs the survival and results in selective reduction in the leukemia burden of NPM1c AML xenograft mice. Indeed, EAPB0503 selectively downregulates HDM2 expression and activates the p53 pathway in NPM1c expressing cells, resulting in apoptosis. Importantly, we unraveled that NPM1c expressing cells exhibit low basal levels of SUMOylation paralleled with high SENP3 and low ARF basal levels. EAPB0503 reverted these molecular players by inducing NPM1c SUMOylation and ubiquitylation, leading to its proteasomal degradation. EAPB0503-induced NPM1c SUMOylation is concurrent with SENP3 downregulation and ARF upregulation in NPM1c expressing cells. Collectively, these results provide a strong rationale for testing therapies modulating NPM1c post-translational modifications in the management of NPM1c AML. 相似文献
13.
The present study was carried out to asses performance of a Pd-monolith downflow bubble column (DBC) reactor, and compare it with that of the slurry and the fixed bed DBC. The selective hydrogenation of butyne-1,4-diol to cis-2-butene-1,4-diol over palladium catalyst was chosen as a model reaction. In principle, the monolith DBC allowed the reaction to take place under kinetic control regime. Comparison with DBC employing 5% Pd/C powder and 1% Pd-on-Raschig ring catalysts revealed a better performance of the monolith DBC (1% Pd loading) with advantage of smaller reaction volume and intensified reaction rate. In the monolith DBC, improved hydrogen transport was possible, as the interface between bubbles and the channel wall was very thin, thus, the length of the diffusion path was very short. In addition, the interfacial surface area at both gas–liquid and liquid–solid interface in the monolith was also very high. The reaction kinetics was well represented by the Langmuir–Hinshelwood mechanism. As an alternative to conventional three-phase reactors, the monolith DBC was simple due to its inherent characteristic operation and no specially designed device. 相似文献
14.
Khaled Sennah Marwan Saliba Nidal Jaalouk 《Journal of Constructional Steel Research》2009,65(5):1034-1042
The Canadian Standard for Antenna Towers and Antenna Supporting Structures, CSA-S37-01, specifies expressions for the compressive resistance of solid rounds based on the Structural Stability Research Council (SSRC) Column Curves for non-solid-round members and the results from experimental investigations on the compressive resistance of solid rounds carried out back to 1965. Similar Standard in USA (TIA/EIA-222-G.0) specifies design criteria for such members as derived from the superseded AISC-LRFD-94 Standard, which is independent of the shape of the member cross-section. The European Standard, Eurocode 3, provides column curves for the compressive resistance of various structural steel members, and assumes the applicability of one of them to solid rounds. As such, it is necessary to conduct an experimental study on solid round stress-relieved steel members to refine the available design equations for such members. This paper provides a summary of the literature review on solid rounds as well as a recent test program conducted on stress-relieved steel solid rounds. Correlation between the results from these tests and the current practice for the design of solid rounds is investigated. The paper concludes with a proposed compressive resistance equation for economical design of such members. 相似文献
15.
16.
Parental and familial factors and their association with adolescents’ mental health were examined among former Soviet Union (FSU) immigrants and nonimmigrants in Israel. Questionnaires regarding parental control, inconsistency, and rejection, in addition to adolescent–family connectedness and psychological disorders, were administered to 83 FSU immigrants and 106 nonimmigrant adolescents. According to the results, FSU adolescents are less connected to their families, experience their parents as less warm and more inconsistent in their childrearing behavior, report that their mothers subject them to a higher level of control, and the psychological disorders among them are more widespread than among nonimmigrant adolescents. Maternal control, maternal temporal inconsistency, and maternal and paternal rejection were associated with psychological disorders only among nonimmigrant adolescents. No such association was found among FSU adolescents, suggesting that FSU mental health problems are associated with immigration and cultural and social factors, rather than parental and familial factors. A comprehensive intervention program is required to provide support and assistance to help immigrants overcome their psychological distresses. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
17.
18.
We have evaluated the extent of public concerns about water management in the Palestinian Territory (PT) through a survey of the main Palestinian newspaper over the last thirteen years divided in three periods: pre (1984–1987), during (1988–1991), and post national uprising period (1992–1996). The public concern in the PT about various water management aspects was clear and influenced by the prevailing political conditions indicating (1) poor concerns in the first and second period where full Israeli military control of the PT and harsh practices prevailed with relatively more emphasis on regional water issues and (2) extensive-strong concerns in the third period when the peace process started and a partial lift of some of the Israeli water practices took place, along with an increased freedom in expressing public concerns which was granted with more emphasis on local issues and problems. Lack and limitation of water available to Palestinians, alternative solutions, and water quality and pollution control constituted the overwhelming majority of the topics of concern to the public for the three periods studied. Palestinian concerns were always greater than regional ones for the three periods and all of the topics considered. Public concern in the PT about all other water management aspects was poor and negligible especially in the first two periods. A massive increase in public concern has been observed in the third period in which the public expressed their concern over most water management aspects, indicating a possible change in public attitude toward water and water management and reflecting the change of the political status by the start of the peace process and the signing of the peace agreements. 相似文献
19.
Generating a Condensed Representation for Association Rules 总被引:1,自引:0,他引:1
Nicolas?PasquierEmail author Rafik?Taouil Yves?Bastide Gerd?Stumme Lotfi?Lakhal 《Journal of Intelligent Information Systems》2005,24(1):29-60
Association rule extraction from operational datasets often produces several tens of thousands, and even millions, of association rules. Moreover, many of these rules are redundant and thus useless. Using a semantic based on the closure of the Galois connection, we define a condensed representation for association rules. This representation is characterized by frequent closed itemsets and their generators. It contains the non-redundant association rules having minimal antecedent and maximal consequent, called min-max association rules. We think that these rules are the most relevant since they are the most general non-redundant association rules. Furthermore, this representation is a basis, i.e., a generating set for all association rules, their supports and their confidences, and all of them can be retrieved needless accessing the data. We introduce algorithms for extracting this basis and for reconstructing all association rules. Results of experiments carried out on real datasets show the usefulness of this approach. In order to generate this basis when an algorithm for extracting frequent itemsets—such as Apriori for instance—is used, we also present an algorithm for deriving frequent closed itemsets and their generators from frequent itemsets without using the dataset. 相似文献
20.
Fadi K. Abu-Farha Marwan K. Khraisheh 《Journal of Materials Engineering and Performance》2007,16(2):142-149
The simplest test in characterizing the behavior of superplastic materials is the uniaxial tensile test. Since superplasticity
is achieved at relatively high temperatures, heat involvement adds so many unpredictable problems to the simplest testing
technique. In spite of the vast number of research activities directed towards studying the various aspects of superplastic
deformation, there is a lack of a standardized testing procedure that can tackle the various issues associated with high temperature
testing. In this work, we attempt to shed some light on the controversial issues associated with high temperature superplastic
testing. The effects of various testing procedures and parameters on the accuracy of the results are investigated. We address
the issues related to gripping and test sample geometry, heat and temperature effects, and comment on the available testing
and analysis procedures. We hope that this study highlights the urgent need to develop a standardized testing approach that
takes into account all the important issues affecting high temperature testing.
This article was presented at the AeroMat Conference, International Symposium on Superplasticity and Superplastic Forming
(SPF) held in Seattle, WA, June 6–9, 2005. 相似文献