Results 31 to 40 of about 8,678 (295)

Equatorial plasma bubbles and L-band scintillations in Africa during solar minimum [PDF]

Annales Geophysicae, 2012
We report on the longitudinal, local time and seasonal occurrence of equatorial plasma bubbles (EPBs) and L band (GPS) scintillations over equatorial Africa.
V. V. Paznukhov, C. S. Carrano, P. H. Doherty, K. M. Groves, K. M. Groves, R. G. Caton, C. E. Valladares, G. K. Seemala, C. T. Bridgwood, J. Adeniyi, L. L. N. Amaeshi, B. Damtie, F. D'Ujanga Mutonyi, J. O. H. Ndeda, P. Baki, O. K. Obrou, B. Okere, G. M. Tsidu   +17 more
doaj   +1 more source

Broadband Meter-Wavelength Observations of Ionospheric Scintillation

, 2015
Intensity scintillations of cosmic radio sources are used to study astrophysical plasmas like the ionosphere, the solar wind, and the interstellar medium. Normally these observations are relatively narrow band. With Low Frequency Array (LOFAR) technology
Brentjens, M., Coles, W. A., de Reijer, J-P., Ebbendorf, N., Enell, C-F., Fallows, R. A., Gerbers, M., Grit, T., Gruppen, P., Iinatti, T., Kero, A., Lehtinen, M., McKay, D., Meulman, H., Norden, M., Orispää, M., Postila, M., Raita, T., Roininen, L., Schoenmakers, A., Stuurwold, K., Turunen, E., Ulich, Th., Vierinen, J., Virtanen, I. I.   +24 more
core   +1 more source

Estimation and Analysis of NavIC Receiver Tracking Jitter due to Amplitude and Phase Scintillations [PDF]

E3S Web of Conferences
An independent, stand-alone satellite navigation system called Navigation with Indian Constellation (NavIC) was created by an Indian space research organization (ISRO) for civilian position, navigation and time applications using mobile devices. Also, it
Swamy K.C.T., Pandurangaiah Y., Reddy Ammana Supraja   +2 more
doaj   +1 more source

The fast light of CsI(Na) crystals

, 2011
The responds of different common alkali halide crystals to alpha-rays and gamma-rays are tested in our research. It is found that only CsI(Na) crystals have significantly different waveforms between alpha and gamma scintillations, while others have not ...
An, Zhenghua, Cai, Xiao, Cao, Jun, Fang, Jian, Ge, Yongshuai, Hu, Tao, Liu, Yingbiao, Lu, Junguang, Lu, Qiwen, Ning, Feipeng, Sun, Xilei, Wang, Yifang, Wang, Zhigang, Xie, Yuguang, Xue, Zhen, Yu, Boxiang, Zhan, Liang, Zhang, Aiwu, Zhou, Li   +18 more
core   +1 more source

Effect of solar and magnetic activity on VHF scintillations near the equatorial anomaly crest [PDF]

Annales Geophysicae, 2004
The VHF amplitude scintillation recorded during the period January 1991 to December 1993 in the declining phase of a solar cycle and April 1998 to December 1999 in the ascending phase of the next solar cycle at Varanasi (geogr.
R. P. Singh, R. P. Patel, A. K. Singh
doaj   +1 more source

VHF and L-band scintillation characteristics over an Indian low latitude station, Waltair (17.7° N, 83.3° E) [PDF]

Annales Geophysicae, 2005
Characteristics of simultaneous VHF (244 MHz) and L-band (1.5 GHz) scintillations recorded at a low-latitude station, Waltair (17.7° N, 83.3° E), during the low sunspot activity year of March 2004 to March 2005, suggest that the occurrence of ...
P. V. S. Rama Rao, S. Tulasi Ram, K. Niranjan, D. S. V. V. D. Prasad, S. Gopi Krishna, N. K. M. Lakshmi   +5 more
doaj   +1 more source

Detection of Bursts from FRB 121102 with the Effelsberg 100-m Radio Telescope at 5 GHz and the Role of Scintillation [PDF]

, 2005
FRB 121102, the only repeating fast radio burst (FRB) known to date, was discovered at 1.4 GHz and shortly after the discovery of its repeating nature, detected up to 2.4 GHz.
L. G. Spitler, W. Herrmann, G. C. Bower, S. Chatterjee, J. M. Cordes, J. W. T. Hessels, M. Kramer, D. Michilli, P. Scholz, A. Seymour, A. P. V. Siemion, Bassa C. G., Cordes J. M., Cordes J. M., Cordes J. M., Cordes J. M., Cordes J. M., Cordes J. M., Desvignes G., Gajjar V., Law C. J., Lazarus P., Marcote B., Metzger B. D., Mikami R., Oostrum L. C., Ransom S. M., Scholz P., Scholz P., Spitler L. G., Spitler L. G., Tendulkar S. P.   +31 more
core   +6 more sources

Diffractive and refractive timescales at 4.8 GHz in PSR B0329+54

, 2011
We present the results of flux density monitoring of PSR B0329+54 at the frequency of 4.8 GHz using the 32-meter TCfA radiotelescope. The observations were conducted between 2002 and 2005.
Bhat, Cordes, Cordes, Esamdin, Gupta, Gupta, Gupta, Hewish, J. Kijak, K. Krzeszowski, Kaspi, Konacki, Kramer, Malofeev, Maron, Rickett, Rickett, Romani, Shishov, Sieber, Simonetti, Stinebring, Stinebring, Stinebring, W. Lewandowski, Wang, Wang, Y. Gupta   +27 more
core   +1 more source

Identifying transcription factors controlling the basal expression of human MRP4 highlights a substantial role for Sp1

FEBS Open Bio, EarlyView.
The MRP4 transporter exports several drugs and signaling molecules. Here, we identified key promoter elements regulating basal MRP4 expression. Using reporter assays, we defined a conserved region with essential Sp1 and contributory Ets sites, which controlled basal MRP4 expression.
Debora Singer, Angelique Kragl, Katrin Ziems, Juliane Glaubitz, Sophie Grammbauer, Susanne Hildebrandt, Mladen V. Tzvetkov, Gabriele Jedlitschky   +7 more
wiley   +1 more source

Hybrid MDM-MIMO radio-over-free space optical system for high-capacity 5G and beyond networks under strong and weak scintillation

Frontiers in Physics
IntroductionThe increasing demand for high-capacity, low-latency communication in 5G and Beyond networks necessitates innovative solutions to overcome the limitations of conventional wireless technologies.
Sushank Chaudhary, Sunita Khichar, Muhammad Saadi, Amir Parniarifard, Abhishek Sharma   +4 more
doaj   +1 more source