Results 11 to 20 of about 3,665,886 (316)

Reconfigurable wideband patch antenna for cognitive radio [PDF]

, 2009
Cognitive radio communication is envisaged to be a new paradigm of methodologies for enhancing the performance of radio communication systems through the efficient utilization of radio spectrum.
AbuTarboush, HF, D. Budimir, Khan, S, Budimir, D, S. Khan, H. F. Abu Tarboush, R. Nilavalan, Nilavalan, R., Budimir, D., Khan, S., Nilavalan, R, Al-Raweshidy, H.S., AbuTarboush, H.F., Al-Raweshidy, H, H. S. Al-Raweshidy   +14 more
core   +1 more source

Frequency hopped CDMA for third generation mobile radio systems [PDF]

, 1993
Third generation mobile radio systems will provide unified mobile access to a wide range of services for the mass user market. Code division multiple access (CDMA) is one of the most viable access techniques to provide the flexible air interface required.
Purle, DJ, Swales, SC, McGeehan, JP, Beach, MA   +3 more
core   +1 more source

Frequencies for Radio Astronomy [PDF]

Nature, 1970
At present the scope of research in radio astronomy is limited by the allocation of frequencies, some of which have to be shared with other radio services. When the International Telecommunications Union reconsiders all frequency allocations next year, astronomers are hoping for an improvement.
openaire   +2 more sources

Multi-frequency HF radar measurements of artificial F-region field-aligned irregularities [PDF]

, 2004
International audienceWe present radar backscatter power measurements using the CUTLASS HF radar at Hankasalmi, Finland from F-region field-aligned irregularities induced by HF radio pumping with the EISCAT Heating facility.
A. Senior, Rietveld, Michael T., Kosch, M.J., Borisov, N. D., Honary, F., Rietveld, M. T., Senior, A., T. K. Yeoman, Borisov, N.D., M. T. Rietveld, Kosch, M. J., M. J. Kosch, F. Honary, Yeoman, T. K., N. D. Borisov, Yeoman, T.K.   +15 more
core   +2 more sources

Radio Frequency Learning Module [PDF]

, 2010
As technology constantly moves forward in its innovative ways to manage inventory in the supply chain, barcodes are becoming a technology of yesterday.
Weir, Erin
core   +1 more source

Construction of optical system for an atomic clock-beyond atomic fountain

Frontiers in Physics, 2022
We demonstrate the construction of the optical system in the atomic clock-beyond atomic fountain based on 87Rb atom. The optical system includes a high-stability laser system and an optical lattice.
Xiumei Wang, Xiumei Wang, Jin He, Yifei Wang, Yunjia Wang, Wenming Wang, Weili Wang, Shiguang Li, Xi Zhu, Guodong Liu, Shuo Liu, Ye Wang, Liang Wang, Yaxuan Liu, Tongmin Yang, Chunyan Cao, Yiqun Wei, Yutao Yue, Guoqing Hu, Zhenfeng Liu, Yimin Pan, Lianshan Gao   +21 more
doaj   +1 more source

Enhancement of Fungal Enzyme Production by Radio-Frequency Electromagnetic Fields

Journal of Fungi, 2022
Enzyme production by microorganisms on an industrial scale has demonstrated technical bottlenecks, such as low efficiency in enzyme expression and extracellular secretion.
Mayura Veerana, Nan-Nan Yu, Si-Jin Bae, Ikhwan Kim, Eun-Seong Kim, Wirinthip Ketya, Hak-Yong Lee, Nam-Young Kim, Gyungsoon Park   +8 more
doaj   +1 more source

Point spread function decoupling in computational fluorescence microscopy

Light: Science & Applications
Computational fluorescence microscopy constantly breaks through imaging performance through advanced optical modulation technologies; however, conventional theoretical modeling and experimental measurement approaches are challenging to meet the demand ...
Ziwei Wang, Wanyu Gu, Shaolei Xu, Yupei Miao, Zewei Cai, Xiang Peng, Xiaoli Liu, Liwei Liu, Qifeng Yu   +8 more
doaj   +1 more source

Size-Prior-Oriented Target Detection and Recognition for Automotive SAR

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Automotive SAR target detection, which involves interpreting scenes or distinguishing different objects from SAR images, is a fundamental and critical problem in intelligent driving. An increasing number of methods have been proposed in airbone-SAR image
Zekang Fan, Bo Zhao, Cuiqi Si, Fengming Huang, Qiuchen Liu, Lei Huang   +5 more
doaj   +1 more source

RFID – Radio Frequency Identification

Informatik-Spektrum, 2008
Der Radio Frequency Identification (RFID) wurde sowohl in der wissenschaftlichen als auch in der popularwissenschaftlichen Literatur in der letzten Zeit viel Aufmerksamkeit eingeraumt. Es handelt sich dabei um eine Technologie, mit der Objekte der Realwelt uber Funkwellen identifiziert werden konnen.
Melski, Adam, Thoroe, Lars, Schumann, Matthias   +2 more
openaire   +2 more sources