Konu "Astronomy & Astrophysics" için Elektrik - Elektronik Mühendisliği Bölümü listeleme

Toplam kayıt 19, listelenen: 1-19

    • A New Algorithm for High-Quality Ionogram Generation and Analysis 

      Arikan, F; Arikan, O; Salous, S (Amer Geophysical Union, 2002)
      Standard digital ionograms that are generated by fast Fourier transform or autoregressive modeling suffer from high interference levels due to other users of the HF channel which produce artifacts and distortion, hence ...

    • A New Technique for Direction of Arrival Estimation for Ionospheric Multipath Channels 

      Güldogan, Mehmet B.; Arıkan, Orhan; Arıkan, Feza (Elsevier Sci Ltd, 2009)
      A novel array signal processing technique is proposed to estimate HF channel parameters including number of paths, their respective direction of arrivals (DOA), delays, Doppler shifts and amplitudes. The proposed technique ...

    • A Search for Pair Production of New Light Bosons Decaying Into Muons 

      Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Eroe, J.; Flechl, M.; Friedl, M.; Fruehwirth, R.; Ghete, V. M.; Hartl, C.; Hoermann, N.; Hrubec, J.; Jeitler, M.; Knuenz, V.; Koenig, A.; Krammer, M.; Kraetschmer, I.; Liko, D.; Matsushita, T.; Mikulec, I.; Rabady, D.; Rahbaran, B.; Rohringer, H. (Elsevier, 2016)
      A search for the pair production of new light bosons, each decaying into a pair of muons, is performed with the CMS experiment at the LHC, using a dataset corresponding to an integrated luminosity of 20.7 fb(-1) collected ...

    • Angular Analysis Of The Decay B+ -> K+Mu(+)Mu(-) In Proton-Proton Collisions At Root S=8 Tev 

      Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Ero, J.; Del Valle, A. Escalante; Flechl, M.; Fruhwirth, R.; Ghete, V. M.; Hrubec, J.; Jeitler, M.; Krammer, N.; Kratschmer, I.; Liko, D.; Madlener, T.; Mikulec, I.; Rad, N.; Rohringer, H.; Schieck, J.; Schofbeck, R.; Spanring, M.; Spitzbart, D.; Taurok, A.; Waltenberger, W.; Wittmann, J.; Wulz, C. -E.; Zarucki, M.; Chekhovsky, V.; Mossolov, V.; Gonzalez, J. Suarez; De Wolf, E. A.; Di Croce, D.; Janssen, X.; Lauwers, J.; Pieters, M.; Van De Klundert, M.; Van Haevermaet, H.; Van Mechelen, P.; Van Remortel, N.; Abu Zeid, S.; Blekman, F.; D'Hondt, J.; De Bruyn, I.; De Clercq, J.; Deroover, K.; Flouris, G.; Lontkovskyi, D.; Lowette, S.; Marchesini, I.; Moortgat, S.; Moreels, L.; Python, Q.; Skovpen, K.; Tavernier, S.; Van Doninck, W.; Van Mulders, P.; Van Parijs, I.; Beghin, D.; Bilin, B. (Amer Physical Soc, 2018)
      The angular distribution of the flavor-changing neutral current decay B+ -> K+mu(+)mu(-) is studied in proton-proton collisions at a center-of-mass energy of 8 TeV. The analysis is based on data collected with the CMS ...

    • Angular Analysis Of The Decay B-0 -> K*(0)Mu(+)Mu(-) From Pp Collisions At Root S=8 Tev 

      Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Eroe, J.; Flechl, M.; Friedl, M.; Fruehwirth, R.; Ghete, V. M.; Hartl, C.; Hoermann, N.; Hrubec, J.; Jeitler, M.; Knuenz, V.; Koenig, A.; Krammer, M.; Kraetschmer, I.; Liko, D.; Matsushita, T.; Mikulec, I.; Rabady, D.; Rahbaran, B.; Rohringer, H.; Schieck, J.; Schoefbeck, R.; Strauss, J.; Treberer-Treberspurg, W.; Waltenberger, W.; Wulz, C. -E.; Mossolov, V.; Shumeiko, N.; Gonzalez, J. Suarez; Alderweireldt, S.; Cornelis, T.; De Wolf, E. A.; Janssen, X.; Knutsson, A.; Lauwers, J.; Luyckx, S.; Ochesanu, S.; Rougny, R. (Elsevier, 2016)
      The angular distributions and the differential branching fraction of the decay B-0 -> K*(892)(0)mu(+)mu(-) are studied using data corresponding to an integrated luminosity of 20.5 fb(-1) collected with the CMS detector at ...

    • Association of Ionospheric Storms and Substorms of Global Electron Content with Proxy Ae Index 

      Yenen, S. D.; Gulyaeva, T. L.; Arikan, F.; Arikan, O. (Elsevier Sci Ltd, 2015)
      Storm time modeling of Global Electron Content (GEC) calculated from GIM-TEC for 1999-2013 is associated with new proxy of Auroral Electrojet variability expressed as a smoothed and normalized Auroral Electrojet index ...

    • Estimation Of Single Station Interfrequency Receiver Bias Using Gps-Tec 

      Arikan, F.; Nayir, H.; Sezen, U.; Arikan, O. (Amer Geophysical Union, 2008)
      Dual-frequency Global Positioning System (GPS) receivers present a plausible and cost-effective way of computing Total Electron Content (TEC). For accurate estimates of TEC, frequency-dependent satellite and receiver ...

    • Investigation of Total Electron Content Variability Due to Seismic and Geomagnetic Disturbances in the Lonosphere 

      Karatay, Secil; Arikan, Feza; Arikan, Orhan (Amer Geophysical Union, 2010)
      Variations in solar, geomagnetic, and seismic activity can cause deviations in the ionospheric plasma that can be detected as disturbances in both natural and man-made signals. Total electron content (TEC) is an efficient ...

    • Mode Separation And Direction Of Arrival Estimation In Hf Links 

      Arikan, F; Yilmaz, N; Arikan, O; Miled, MKBH (Amer Geophysical Union, 2003)
      [1] Estimation of arrival angles and incoming signals is a challenging problem for HF channels where the signals are correlated and the separation between the signals can be as low as a couple of degrees. In this paper, a ...

    • Multipath Separation-Direction Of Arrival (Ms-Doa) With Genetic Search Algorithm For Hf Channels 

      Arikan, Feza; Koroglu, Ozan; Fidan, Serdar; Arikan, Orhan; Guldogan, Mehmet B. (Elsevier Sci Ltd, 2009)
      Direction-of-Arrival (DOA) defines the estimation of arrival angles of an electromagnetic wave impinging oil a set of sensors. For dispersive and time-varying HF channels, where the propagating wave also suffers from the ...

    • Online User-Friendly Slant Total Electron Content Computation From Iri-Plas: Iri-Plas-Stec 

      Tuna, Hakan; Arikan, Orhan; Arikan, Feza; Gulyaeva, Tamara L.; Sezen, Umut (Amer Geophysical Union, 2014)
      Slant total electron content (STEC), the total number of free electrons on a ray path, is an important space weather observable. STEC is the main input for computerized ionospheric tomography (CIT). STEC can be estimated ...

    • Regional Model-Based Computerized Ionospheric Tomography Using Gps Measurements: Ionolab-Cit 

      Tuna, Hakan; Arikan, Orhan; Arikan, Feza (Amer Geophysical Union, 2015)
      Three-dimensional imaging of the electron density distribution in the ionosphere is a crucial task for investigating the ionospheric effects. Dual-frequency Global Positioning System (GPS) satellite signals can be used to ...

    • Regional Tec Mapping with Random Field Priors and Kriging 

      Sayin, I.; Arikan, F.; Arikan, O. (Amer Geophysical Union, 2008)
      Total Electron Content ( TEC) is an important parameter in monitoring ionospheric variability. In a given region, TEC can be obtained only by interpolation of measurements due to sparsity of the useful data. The lack of a ...

    • Regularized Estimation of Tec from Gps Data for Certain Midlatitude Stations and Comparison with the Iri Model 

      Ankan, Feza; Arikan, Orhan; Erol, Cemil B. (Elsevier Sci Ltd, 2007)
      Regularized estimation of Total Electron Content (Reg-Est) is a novel technique which can combine signals from all the satellites for a given instant and given station and estimate the vertical TEC (VTEC) values for any ...

    • Regularized Estimation of Vertical Total Electron Content from Global Positioning System Data 

      Arikan, F; Erol, CB; Arikan, O (Amer Geophysical Union, 2003)
      A novel regularization technique which can combine signals from all Global Positioning System (GPS) satellites for a given instant and a given receiver is developed to estimate the vertical total electron content (VTEC) ...

    • Regularized Estimation of Vertical Total Electron Content From Gps Data For A Desired Time Period 

      Arikan, F; Erol, CB; Arikan, O (Amer Geophysical Union, 2004)
      In this paper a new algorithm for short-term regularized estimation of vertical total electron content (VTEC) from Global Positioning System (GPS) data is developed. The regularization technique can combine signals, from ...

    • Spatio-Temporal Interpolation Of Total Electron Content Using A Gps Network 

      Deviren, M. N.; Arikan, F.; Arikan, O. (Amer Geophysical Union, 2013)
      Constant monitoring and prediction of Space Weather events require investigation of the variability of total electron content (TEC), which is an observable feature of ionosphere using dual-frequency GPS receivers. Due to ...

    • Tomographic Reconstruction Of The Ionospheric Electron Density As A Function Of Space And Time 

      Erturk, Onur; Arikan, Orhan; Arikan, Feza (Elsevier Sci Ltd, 2009)
      Electron density distribution is the major determining parameter of the ionosphere. Computerized Ionospheric Tomography (CIT) is a method to reconstruct ionospheric electron density image by computing Total Electron Content ...

    • Total Electron Content Estimation With Reg-Est 

      Nayir, H.; Arikan, F.; Arikan, O.; Erol, C. B. (Amer Geophysical Union, 2007)
      Total Electron Content ( TEC) constitutes one of the key elements for observing the variable structure of the ionosphere. GPS provides a cost- effective alternative in TEC estimation through earth- based receivers. In this ...