全文获取类型
收费全文 | 277篇 |
免费 | 13篇 |
专业分类
电工技术 | 2篇 |
综合类 | 1篇 |
化学工业 | 61篇 |
金属工艺 | 1篇 |
机械仪表 | 9篇 |
建筑科学 | 10篇 |
能源动力 | 8篇 |
轻工业 | 39篇 |
水利工程 | 2篇 |
石油天然气 | 1篇 |
无线电 | 9篇 |
一般工业技术 | 43篇 |
冶金工业 | 7篇 |
原子能技术 | 3篇 |
自动化技术 | 94篇 |
出版年
2023年 | 3篇 |
2022年 | 5篇 |
2021年 | 26篇 |
2020年 | 5篇 |
2019年 | 13篇 |
2018年 | 18篇 |
2017年 | 14篇 |
2016年 | 11篇 |
2015年 | 8篇 |
2014年 | 16篇 |
2013年 | 37篇 |
2012年 | 21篇 |
2011年 | 25篇 |
2010年 | 18篇 |
2009年 | 10篇 |
2008年 | 11篇 |
2007年 | 6篇 |
2006年 | 8篇 |
2005年 | 4篇 |
2004年 | 2篇 |
2003年 | 2篇 |
2002年 | 5篇 |
2001年 | 3篇 |
2000年 | 4篇 |
1999年 | 3篇 |
1998年 | 4篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1994年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1968年 | 2篇 |
排序方式: 共有290条查询结果,搜索用时 15 毫秒
31.
Gorgievski-Duijvesteijn Marjan J.; Giesen Carin W. M.; Bakker Arnold B. 《Canadian Metallurgical Quarterly》2000,5(3):359
Over a 10-year period, this survey study of 91 Dutch dairy farm couples investigated both causal and reversed causal relationships between couples' financial problems and husbands' and wives' mental and physical health complaints, as well as crossover effects of mental and physical health complaints between spouses. These relationships were tested simultaneously using structural equation modeling analyses. Results showed that financial problems were not predictive of health complaints for either spouse but that husbands' health complaints did predict both couples' financial problems and wives' health complaints 10 years later. These findings emphasize the importance of mental and physical health as resources for both the business and the family. For wives, these effects were not found, which may reflect the different positions of husbands and wives at the farm and, hence, the different ways they allocate their resources. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
32.
An implantable closedloop asynchronous drug delivery system for the treatment of refractory epilepsy
Salam MT Mirzaei M Ly MS Nguyen DK Sawan M 《IEEE transactions on neural systems and rehabilitation engineering》2012,20(4):432-442
In this paper, we present an implantable device for intra-cerebral electroencephalography (icEEG) data acquisition and real-time epileptic seizure detection with simultaneous focal antiepileptic drug injection feedback. This implantable device includes a neural signal amplifier, an asynchronous seizure detector, a drug delivery system (DDS) including a micropump, and a hybrid subdural electrode (HSE). The asynchronous detection algorithm is based on data-dependent analysis and validated with Matlab tools. The detector and DDS have a power saving mode. The HSE contacts are made of Platinum (Pt) encapsulated with polydimethylsiloxane (PDMS). Given the heterogeneity of electrographic seizure signals and seizure suppression threshold, the implantable device provides tunable parameters facility through an external transmitter to adapt to each individual's neurophysiology prior to clinical deployment. The proposed detector and DDS were assembled in ? 50 mm and ? 30 mm circular printed circuit boards, respectively. The detector was validated using icEEG recordings of seven patients who had previously undergone an intracranial investigation for epilepsy surgery. The triggering of the DDS was tested and a predefined seizure suppression dose was delivered ~16 s after electrographical seizure onsets. The device's power consumption was reduced by 12% in active mode and 49% in power saving mode compared to similar seizure detection algorithms implemented with synchronous architecture. 相似文献
33.
34.
Effect of phytic acid–modified layered double hydroxide on flammability and mechanical properties of intumescent flame retardant polypropylene system 下载免费PDF全文
Ehsan Naderi Kalali Anabel Montes Xin Wang Lu Zhang Marjan E. Shabestari Zhi Li De‐Yi Wang 《火与材料》2018,42(2):213-220
Phytic acid–modified layered double hydroxide (Ph‐LDH) was synthesized via coprecipitation method and subsequently was used in polypropylene (PP) by combining with an ammonium polyphosphate (APP) via melt compounding method. The synergistic effect between APP and Ph‐LDH on the thermal stability, flammability, and mechanical properties of the resultant PP composites was investigated by thermogravimetric analysis, limiting oxygen index, vertical burning test (UL‐94), cone calorimeter tests, tensile test, and impact test. Morphologies of the chars obtained from the samples after the cone calorimeter tests were studied by scanning electron microscopy. The combination of APP and Ph‐LDH slightly influenced the impact and tensile properties of PP. Also, the synergistic effect between APP and Ph‐LDH occurred in the cone calorimeter test. Moreover, the combination of APP and Ph‐LDH produced better quality char that effectively suppressed the spread of the flame and volatile and finally extinguished the fire. 相似文献
35.
Moradi Marjan Rastakhiz Nahid Ghaedi Mehrorang Zhiani Rahele 《Catalysis Letters》2021,151(6):1653-1662
Catalysis Letters - Nitro-aromatic pollution in industrial waste streams threat wellbeing of water resources. This study investigates the performance of a copper-based nano catalyst to reduce... 相似文献
36.
The private rental sector (PRS) is growing in many Western countries after a period of decline. In Belgium, a renewed policy interest in the PRS emerges and the sector is believed to play an important role in addressing housing needs of low-income households. Steering these households to the PRS is however not without problems. The supply side of the market is not necessarily willing to accommodate vulnerable renters. Landlords and real estate brokers install mechanisms to exclude financially vulnerable households throughout the entire rental procedure. These in turn develop (counter)strategies to get round the obstacles and to increase their chances. In this article, we apply an interactional perspective to study the interplay of strategies developed by both sides of the market. The article is based on 58 in-depth interviews with landlords and brokers, testimonies of low-income tenants from 15 focus groups plus 5 in-depth interviews about the influence of different discrimination grounds on their private rental experiences. 相似文献
37.
38.
John Fredy Vélez Santa Svit Menart Marjan Bele Francisco Ruiz-Zepeda Primož Jovanovič Vasko Jovanovski Martin Šala Milutin Smiljanić Nejc Hodnik 《International Journal of Hydrogen Energy》2021,46(49):25039-25049
Developing a Pt-based electrocatalytic material able to selectively catalyze hydrogen oxidation (HOR) while supressing oxygen reduction (ORR) is beneficial for durability of the fuel cells. Namely, degradation of carbon supported Pt particles is dramatically influenced by the unwanted ORR enrolling at the anode due to the air penetration during start-up/shut-down events. We present an organic matrix tris(aza)pentacene (TAP), which belongs to π-functional materials with ladder-like conjugated nitrogen-containing units, as the support for Pt to form a “smart” fuel cell anode able to selectively catalyze HOR and to suppress ORR. “Switching-on/off” of the composite material activity is provided by reversible reduction/oxidation of the TAP in the low potential region which provokes TAP - HxTAP transition. Conductivity of the reduced HxTAP enables supported Pt particles to effectively run HOR. In contrast, restricted conductivity of oxidized TAP analogue leads to the substantial drop in the ORR activity with respect to benchmark Pt/C catalyst. 相似文献
39.
40.
Marjan Safarzadeh S. Ramesh C.Y. Tan Hari Chandran Ahmad Fauzi Mohd Noor S. Krishnasamy U. Johnson Alengaram S. Ramesh 《Ceramics International》2019,45(3):3473-3477
The effect of multi-ions (Mg2+, SiO44-, Zn2+, Cu2+) doping on the properties of carbonated hydroxyapatite (CHA) prepared by a wet chemical method has been investigated. Different combinations of ions were doped into the CHA and the as-synthesized compacts were sintered at 900?°C prior to body characterization. It was found that regardless of ions doping, the lattice structure of the CHA was not disrupted. In addition, secondary phases were not detected for all the multi-ions doped samples. The XRD and FTIR results further confirmed the presences of a B-Type CHA in the sintered samples. The XRD analysis revealed that the lattice parameters (c/a ratio) increased with dopant addition and resulted in a smaller crystallite size. The FESEM examination also showed the presences of smaller grain size for the multi-ions doped CHA samples thus indicating that the doping was beneficial in suppressing grain coarsening in carbonated hydroxyapatite. 相似文献