全文获取类型
收费全文 | 1279篇 |
免费 | 32篇 |
国内免费 | 6篇 |
专业分类
电工技术 | 76篇 |
综合类 | 2篇 |
化学工业 | 342篇 |
金属工艺 | 54篇 |
机械仪表 | 19篇 |
建筑科学 | 22篇 |
能源动力 | 59篇 |
轻工业 | 117篇 |
水利工程 | 3篇 |
无线电 | 95篇 |
一般工业技术 | 215篇 |
冶金工业 | 103篇 |
原子能技术 | 31篇 |
自动化技术 | 179篇 |
出版年
2024年 | 2篇 |
2023年 | 8篇 |
2022年 | 25篇 |
2021年 | 27篇 |
2020年 | 19篇 |
2019年 | 16篇 |
2018年 | 36篇 |
2017年 | 32篇 |
2016年 | 33篇 |
2015年 | 21篇 |
2014年 | 44篇 |
2013年 | 80篇 |
2012年 | 66篇 |
2011年 | 87篇 |
2010年 | 53篇 |
2009年 | 75篇 |
2008年 | 82篇 |
2007年 | 53篇 |
2006年 | 42篇 |
2005年 | 48篇 |
2004年 | 46篇 |
2003年 | 44篇 |
2002年 | 37篇 |
2001年 | 29篇 |
2000年 | 14篇 |
1999年 | 29篇 |
1998年 | 48篇 |
1997年 | 25篇 |
1996年 | 26篇 |
1995年 | 25篇 |
1994年 | 16篇 |
1993年 | 15篇 |
1992年 | 13篇 |
1991年 | 9篇 |
1990年 | 8篇 |
1989年 | 12篇 |
1988年 | 8篇 |
1987年 | 7篇 |
1986年 | 5篇 |
1985年 | 6篇 |
1984年 | 10篇 |
1983年 | 6篇 |
1982年 | 5篇 |
1980年 | 4篇 |
1979年 | 5篇 |
1977年 | 6篇 |
1976年 | 3篇 |
1973年 | 2篇 |
1971年 | 1篇 |
1970年 | 2篇 |
排序方式: 共有1317条查询结果,搜索用时 0 毫秒
31.
Thermoelectric Detection of Multi‐Subband Density of States in Semiconducting and Metallic Single‐Walled Carbon Nanotubes
下载免费PDF全文
![点击此处可从《Small (Weinheim an der Bergstrasse, Germany)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
32.
Single-heterostructure crystals of a series of halogen-bridged quasi-one- dimensional mixed-valence transition metal complexes (HMMCs) were fabricated by selective coordination epitaxial growth (SCE growth). The overgrowth crystals of the HMMC were grown on the columnar crystals of the substrate HMMC in solution. The single-heterostructure crystals were epitaxially grown only when the two HMMCs had similar crystal structures. If their crystal structures were different, no heterostructure crystal was grown. This result suggests that the degree of mismatch between the crystal structures of the substrate and the overgrowth is the predominant factor which determines the SCE growth of the HMMCs. 相似文献
33.
A novel packet bit error rate (BER) and loss measurement method and system is proposed. A proposed 40 Gbit/s packet BER and loss measurement system is expressed in detail. A 40 Gbit/s BER and loss measurement with various conditions is demonstrated experimentally. In real time, only the payload part of a packet and burst stream with fluctuated guard time is evaluated. The BER and packet loss of a randomly received packet sequence due to routing and buffering can be also evaluated by the measurement system. A 10 Gbit/s packet BER and loss measurement with optical label switching, buffering, and preamble-free optical packet 3R are demonstrated experimentally. 相似文献
34.
Kazuhiro Maeta Manal Farea Hisahide Nishio Masafumi Matsuo 《International journal of molecular sciences》2022,23(9)
Antisense oligonucleotides (ASOs) are agents that modulate gene function. ASO-mediated out-of-frame exon skipping has been employed to suppress gene function. Myostatin, encoded by the MSTN gene, is a potent negative regulator of skeletal muscle growth. ASOs that induce skipping of out-of-frame exon 2 of the MSTN gene have been studied for their use in increasing muscle mass. However, no ASOs are currently available for clinical use. We hypothesized that ASOs against the splicing enhancer sequence within exon 1 of the MSTN gene would inhibit maturation of pre-mRNA, thereby suppressing gene function. To explore this hypothesis, ASOs against sequences of exon 1 of the MSTN gene were screened for their ability to reduce mature MSTN mRNA levels. One screened ASO, named KMM001, decreased MSTN mRNA levels in a dose-dependent manner and reciprocally increased MSTN pre-mRNA levels. Accordingly, KMM001 decreased myostatin protein levels. KMM001 inhibited SMAD-mediated myostatin signaling in rhabdomyosarcoma cells. Remarkably, it did not decrease GDF11 mRNA levels, indicating myostatin-specific inhibition. As expected, KMM001 enhanced the proliferation of human myoblasts. We conclude that KMM001 is a novel myostatin inhibitor that inhibits pre-mRNA maturation. KMM001 has great promise for clinical applications and should be examined for its ability to treat various muscle-wasting conditions. 相似文献
35.
Arash Ajoudani Andrea Maria Zanchettin Serena Ivaldi Alin Albu-Schäffer Kazuhiro Kosuge Oussama Khatib 《Autonomous Robots》2018,42(5):957-975
Recent technological advances in hardware design of the robotic platforms enabled the implementation of various control modalities for improved interactions with humans and unstructured environments. An important application area for the integration of robots with such advanced interaction capabilities is human–robot collaboration. This aspect represents high socio-economic impacts and maintains the sense of purpose of the involved people, as the robots do not completely replace the humans from the work process. The research community’s recent surge of interest in this area has been devoted to the implementation of various methodologies to achieve intuitive and seamless human–robot-environment interactions by incorporating the collaborative partners’ superior capabilities, e.g. human’s cognitive and robot’s physical power generation capacity. In fact, the main purpose of this paper is to review the state-of-the-art on intermediate human–robot interfaces (bi-directional), robot control modalities, system stability, benchmarking and relevant use cases, and to extend views on the required future developments in the realm of human–robot collaboration. 相似文献
36.
Issei Fujimoto Nini Wang Rie Saito Yugo Miseki Takahiro Gunji Kazuhiro Sayama 《International Journal of Hydrogen Energy》2014
We report on the improvement in the water splitting efficiency of a WO3/BiVO4 composite photoelectrode by the application of an improved auto-combustion method to the preparation of porous BiVO4 thin films. The unique feature of this preparation method is the addition of both NH4NO3, as a strong oxidizing agent, and an organic additive into BiVO4 precursor solution. The local decomposition heat of the organic additive and oxidizing agent created a porous film with small, highly crystalline BiVO4 particles. The photoelectrode has many advantages over existing ones, such as the high light-harvesting efficiency (LHE), a single BiVO4 phase, the facile access of the holes to the photoelectrode/electrolyte interface, and the ease of water and oxygen diffusion. The maximum incident photon-to-current efficiency (IPCE) was estimated to be 64% (at 440 nm, 1.23 V vs. RHE) and the applied bias photon-tocurrent efficiency (ABPE) reached as high as 1.28%. This ABPE value is highest among all oxide semiconductor photoelectrodes reported previously, except for the case of a stacking photoelectrode system. 相似文献
37.
Mingtao Li Li Yang Shaohua Fang Siming Dong Shin‐ichi Hirano Kazuhiro Tachibana 《Polymer International》2012,61(2):259-264
Polymerized ionic liquids (PILs) having guanidinium cations with different counter‐anions, such as PF6? and N(CF3SO2)2? (TFSI?), were synthesized by copolymerization of a guanidinium ionic liquid monomer with methyl acrylate followed by an anion exchange reaction. Furthermore, incorporating a guanidinium ionic liquid, LiTFSI salt and nano‐size SiO2, a quaternary gel polymer electrolyte based on one of the PILs as the polymer host was prepared. The quaternary gel polymer electrolyte was chemically stable even at a higher temperature of 80 °C in contact with the lithium anode. In particular, the electrolyte exhibited high lithium ion conductivity, wide electrochemical stability window and good lithium stripping/plating performance. Li/LiFePO4 batteries with the quaternary gel polymer electrolyte at 80 °C had capacities of 140 and 130 mA h g?1 respectively at 0.1 and 0.2 C current rates. Copyright © 2011 Society of Chemical Industry 相似文献
38.
In vivo measurement of swallowing by monitoring thyroid cartilage movement in healthy subjects using thickened liquid samples and its comparison with sensory evaluation
下载免费PDF全文
![点击此处可从《Journal of texture studies》网站下载免费的PDF全文](/ch/ext_images/free.gif)
39.
Koreyoshi Imamura Kohshi Kinugawa Ryo Kagotani Mayo Nomura Kazuhiro Nakanishi 《Journal of food engineering》2012
Amorphous matrices made up of sugar molecules, are frequently used in food and pharmaceutical industries. A drawback to their use is that they are susceptible to collapse, as a result of water uptake and an increase in temperature and subsequently crystallize. Herein, the crystallization characteristics of amorphous sugar (sucrose and α-lactose) preparations were analyzed, with the purpose of obtaining knowledge that could lead to the prediction of how long the amorphous state is retained under various conditions. The impact of compression, physical aging and freezing rate on the induction period (tind) for crystallization were examined. Freeze-dried sugar samples were compressed at 74 or 443 MPa (5 min) and then rehumidified at specified RHs. Some freeze-dried sucrose samples were physically aged, and alternatively freeze-drying was conducted under different conditions. The isothermal crystallization of the prepared samples at different temperatures (T), the glass transition and the crystallization temperature (Tcry) were measured, using differential scanning calorimetry. The compression markedly decreased the tind, while significantly lowered the hygroscopicity. Physical aging and slower-freezing also shortened the tind. The tind was found to be correlated exclusively with (Tcry–T), regardless of rehumidification, compression, sugar type, physical aging and freezing rate in the freeze-drying process. 相似文献
40.
Microsystem Technologies - This paper describes the fabrication of a vertically-allocated SU-8 cantilever in a closed fluidic channel. The difficulties to fabricate the vertically-allocated SU-8... 相似文献