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排序方式: 共有97条查询结果,搜索用时 15 毫秒
1.
Wireless Networks - Key generation leveraging wireless channel reciprocity can establish secret keys from unauthenticated broadcast channels and thus protect the communication of wireless networks.... 相似文献
2.
Fumin Li Chong Chen Furui Tan Gentian Yue Liang Shen Weifeng Zhang 《Nanoscale research letters》2014,9(1):240
We report that the efficiency of ITO/nc-TiO2/P3HT:PCBM/MoO3/Ag inverted polymer solar cells (PSCs) can be improved by dispersing CdS quantum dot (QD)-sensitized TiO2 nanotube arrays (TNTs) in poly (3-hexylthiophene) and [6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PCBM) layer. The CdS QDs are deposited on the TNTs by a chemical bath deposition method. The experimental results show that the CdS QD-sensitized TNTs (CdS/TNTs) do not only increase the light absorption of the P3HT:PCBM layer but also reduce the charge recombination in the P3HT:PCBM layer. The dependence of device performances on cycles of CdS deposition on the TNTs was investigated. A high power conversion efficiency (PCE) of 3.52% was achieved for the inverted PSCs with 20 cyclic depositions of CdS on TNTs, which showed a 34% increase compared to the ITO/nc-TiO2/P3HT:PCBM/MoO3/Ag device without the CdS/TNTs. The improved efficiency is attributed to the improved light absorbance and the reduced charge recombination in the active layer. 相似文献
3.
随天然气井开发趋于高温、高压,油气集输系统设计要求愈加严格。管道埋设深度是管道设计的基本参数,通常根据地质情况、地表荷载和经济成本等因素考虑取值。近年来,由于应力过高、形变过大等问题已对管道稳定造成了极大威胁,采取有效的手段缓解集输管道的应力问题势在必行。文章通过分析现有集输管道埋设深度的规定,结合集输管道轴向和纵向失稳规律,综合探讨了集输管道埋设深度设计思路,并通过典型案例计算对探讨内容进行了验证。研究结果表明,依靠规范设置的最小埋设深度不足以保证管道的轴向和纵向稳定性,文章提出的集输管道埋设深度设计方案具有较高的理论性与实用性,可为设计人员进行安全的集输管道设计提供实用的参考与借鉴。 相似文献
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针对涂装高温烘干室车辆连续进出操作的需求,在进口处设计一种隔断内外空气泄漏的顶吹式风幕.利用数值仿真的方法,研究某顶吹风幕热力参数对密封效果和节能特性的影响规律.研究结果表明:随着风幕入射角度的增大,实现密封效果所需要的最小风速有所降低;尽管提高风幕入射角度,所对应的最小密封风速较低,但是车间入口处的温度明显提高,热能浪费严重;此外,相比入射风速变化的影响,风幕入射角变化对密封效果的影响更为显著.在无车辆进出条件下,风幕入射速度为12 m/s、入射角度为45°时,可以同时达到较好的密封和节能效果. 相似文献
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Shuji Furui Hisashi Umekawa Kouichi Hayashi Mamoru Ozawa Nobuyuki Takenaka 《亚洲传热研究》2003,32(8):727-739
Fluidized bed combustion is one of the advantageous technologies for coal and/or incineration firing especially with respect to the environmental protection of emissions, such as NOx/SOx. Bed material movement in such a fluidized bed has a prime importance in the heat transfer process. Thus, quantitative measurement of the bed material movement and the void fraction are indispensable for better understanding of the fluidized bed. In this investigation, neutron radiography is applied to visualize the bed material movement in a simulated fluidized bed heat exchanger installed with vertical tubes. Bubble behavior and void fraction profile are obtained by the image processing technique. Bubble movement is highly restrained by these vertical tubes, so that the bubbles rise up along the tube. The bubble diameter is well correlated by the modified Mori and Wen's correlation taking into account the pitch of the tube arrangement. The bubble rise velocity and void fraction are well correlated by applying the drift‐flux model. © 2003 Wiley Periodicals, Inc. Heat Trans Asian Res, 32(8): 727–739, 2003; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/htj.10127 相似文献
9.
Sadaoki Furui 《The Journal of VLSI Signal Processing》2005,41(3):245-254
The principal cause of speech recognition errors is a mismatch between trained acoustic/language models and input speech due
to the limited amount of training data in comparison with the vast variation of speech. It is crucial to establish methods
that are robust against voice variation due to individuality, the physical and psychological condition of the speaker, telephone
sets, microphones, network characteristics, additive background noise, speaking styles, and other aspects. This paper overviews
robust architecture and modeling techniques for speech recognition and understanding. The topics include acoustic and language
modeling for spontaneous speech recognition, unsupervised adaptation of acoustic and language models, robust architecture
for spoken dialogue systems, multi-modal speech recognition, and speech summarization. This paper also discusses the most
important research problems to be solved in order to achieve ultimate robust speech recognition and understanding systems.
Dr. Sadaoki Furui is currently a Professor at Tokyo Institute of Technology, Department of Computer Science. He is engaged in a wide range
of research on speech analysis, speech recognition, speaker recognition, speech synthesis, and multimodal human-computer interaction
and has authored or coauthored over 450 published articles. From 1978 to 1979, he served on the staff of the Acoustics Research
Department of Bell Laboratories, Murray Hill, New Jersey, as a visiting researcher working on speaker verification. He is
a Fellow of the IEEE, the Acoustical Society of America and the Institute of Electronics, Information and Communication Engineers
of Japan (IEICE). He was President of the Acoustical Society of Japan (ASJ) from 2001 to 2003 and the Permanent Council for
International Conferences on Spoken Language Processing (PC-ICSLP) from 2000 to 2004. He is currently President of the International
Speech Communication Association (ISCA). He was a Board of Governor of the IEEE Signal Processing Society from 2001 to 2003.
He has served on the IEEE Technical Committees on Speech and MMSP and on numerous IEEE conference organizing committees. He
has served as Editor-in-Chief of both Journal of Speech Communication and the Transaction of the IEICE. He is an Editorial
Board member of Speech Communication, the Journal of Computer Speech and Language, and the Journal of Digital Signal Processing.
He has received the Yonezawa Prize and the Paper Awards from the IEICE (1975, 88, 93, 2003), and the Sato Paper Award from
the ASJ (1985, 87). He has received the Senior Award from the IEEE ASSP Society (1989) and the Achievement Award from the
Minister of Science and Technology, Japan (1989). He has received the Technical Achievement Award and the Book Award from
the IEICE (2003, 1990). He has also received the Mira Paul Memorial Award from the AFECT, India (2001). In 1993 he served
as an IEEE SPS Distinguished Lecturer. He is the author of “Digital Speech Processing, Synthesis, and Recognition” (Marcel
Dekker, 1989, revised, 2000) in English, “Digital Speech Processing” (Tokai University Press, 1985) in Japanese, “Acoustics
and Speech Processing” (Kindai-Kagaku-Sha, 1992) in Japanese, and “Speech Information Processing” (Morikita, 1998) in Japanese.
He edited “Advances in Speech Signal Processing” (Marcel Dekker, 1992) jointly with Dr. M.M. Sondhi. He has translated into
Japanese “Fundamentals of Speech Recognition,” authored by Drs. L.R. Rabiner and B.-H. Juang (NTT Advanced Technology, 1995)
and “Vector Quantization and Signal Compression,” authored by Drs. A. Gersho and R. M. Gray (Corona-sha, 1998). 相似文献
10.
K Takeshita S Furui S Ban A Harasawa H Kohtake T Yamauchi Y Sasaki T Shirai Y Kikuchi 《Canadian Metallurgical Quarterly》1996,56(11):744-746
Helical computed tomography was performed with intravenous contrast material administration in ten patients with hepatic tumors (metastatic tumor, n = 6; hepatocellular carcinoma, n = 4). Maximum intensity projection (MIP) images of intrahepatic portal venous branches and hepatic veins, and shaded surface display (SSD) images of the hepatic tumors were reconstructed for each patient. The MIP image and SSD image were fitted to overlap on a single display to obtain three-dimensional (3-D) images showing both the hepatic vessels and hepatic tumors. Subsegmental localization of the tumors determined from the 3-D images proved to be correct in all of the six patients who received hepatic resection after examination. 3-D images seem to be useful for preoperative assessment of hepatic tumors. 相似文献