The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform

Bahattin Çelik - One of the best experts on this subject based on the ideXlab platform.

  • A new Pre-Pottery Neolithic site in Southeastern Turkey: Ayanlar Höyük (Gre Hut)
    Documenta Praehistorica, 2018
    Co-Authors: Bahattin Çelik
    Abstract:

    Ayanlar Hoyuk (Gre Hut), located 30km west of Şanliurfa, was discovered during surface surveys conducted in 2013. Ayanlar Hoyuk dated to the Pre-Pottery Neolithic Period, is a large- scale mound like Gobekli Tepe and Karahan Tepe, covering an overall surface area of 14 hectares. It was learned recently that three artefacts dated to the Pre-Pottery Neolithic period which are held by Şanliurfa Museum were brought from Ayanlar Hoyuk. The artefacts in Şanliurfa Museum and the finds recovered from Ayanlar Hoyuk during a surface survey have been identified as having characteristics similar to those from Kortik Tepe, Gobekli Tepe, Nevali Cori and Karahan Tepe. Con­sequently, Ayanlar Hoyuk should be dated between the early Pre-Pottery Neolithic Period B (EPPNB) and the mid-Pre-Pottery Neolithic Period B (MPPNB).

  • NEW PRE-POTTERY NEOLITHIC SETTLEMENTS FROM VùRANşEHùR DISTRICT
    2012
    Co-Authors: Mustafa Güler, Bahattin Çelik, Gül Güler
    Abstract:

    In the present study, the Neolithic Period settlements at Bauaran Hoyuk, Bauaran-Herzo Tepe and Kocanizam Tepe located within the provincial borders of sanliurfa province Viranuehir district. The properties of all settlements pertaining to the Pre-Pottery Neolithic period are unearthed and significant findings are encountered as regards the civil architecture of that era. Arranged in the north-south direction and founded with 3-5 km intervals, such settlements revealed a unique property never encountered in the region before. Sefer Tepe settlement, which is already discovered and possessing identical properties with the Pre-Pottery Neolithic Period settlements, such as Nevali Cori, Gobekli Tepe and Karahan Tepe, containing “T” shaped pillars, is further examined under the scope of the present study. Bauaran Hoyuk, Bauaran-Herzo Tepesi and Kocanizam Tepe are discovered recently during the cultural inventory studies conducted in 2011

C.l. Purdy - One of the best experts on this subject based on the ideXlab platform.

  • Prelaunch performance of the NASA altimeter for the TOPEX/Poseidon project
    IEEE Transactions on Geoscience and Remote Sensing, 1993
    Co-Authors: P.c. Marth, G.s. Hayne, D.w. Hancock, C.l. Purdy, C. C. Kilgus, J.r. Jensen, J.a. Perschy, J.l. Macarthur, L. C. Rossi, C.j. Koblinsky
    Abstract:

    The TOPEX/Poseidon radar altimeter satellite applies advances in remote sensing instrumentation to reduce long wavelength measurement errors to dramatically lower levels. The TOPEX altimeter measures the range to the ocean surface with 2-cm precision and accuracy through the use of both Ku- and C-band radars, a high pulse repetition frequency, an agile tracker, and absolute internal height calibration. Dual pulse bandwidths for both frequencies make it possible to quickly acquire the surface and begin tracking after crossing the land/ocean boundary. The altimeter requirements and the elements of the altimeter design that have resulted in meeting these requirements are presented. Prelaunch test data, based on the use of a radar altimeter system evaluator to simulate the backscatter from the ocean surface, are presented to demonstrate that the TOPEX altimeter will meet these requirements and provide the data necessary to the understanding of basin scale mean circulation. >

  • NASA radar altimeter for the TOPEX/POSEIDON Project
    Proceedings of the IEEE, 1991
    Co-Authors: A.r. Zieger, G.s. Hayne, D.w. Hancock, C.l. Purdy
    Abstract:

    The TOPEX/POSEIDON Project is a joint US and French mission to develop and operate an Earth-orbiting satellite with sensors capable of making accurate measurements of sea level. The NASA radar altimeter (NRA), a fifth-generation US Altimeter, will provide the primary measurement for the TOPEX/POSEIDON Project altimetric mission. The authors present the requirements, altimeter fundamentals, design description, integration and test program, primary elements of ground processing, and assessment for the dual-frequency NASA radar altimeter. >

  • Engineering performance analysis of the TOPEX radar altimeter
    Proceedings of IGARSS '94 - 1994 IEEE International Geoscience and Remote Sensing Symposium, 1
    Co-Authors: G.s. Hayne, D.w. Hancock, C.l. Purdy
    Abstract:

    Describes the Wallops Flight Facility continuing work in engineering performance analysis for the NASA radar altimeter of the TOPEX/POSEIDON mission (referred to simply as the TOPEX altimeter). Because an altimeter measuring range at two frequencies allows the ionosphere-caused error to be corrected, the TOPEX altimeter comprises a primary radar altimeter at Ku-band (13.6 GHz) and a secondary radar altimeter at C-band (5.3 GHz). For the TOPEX Ku and C altimeters the authors report performance and calibration results for range and for the radar surface backscattering cross-section /spl sigma//sup 0/. Except for the antenna the TOPEX altimeter has two redundant systems, sides A and B. Only side A has been operated since launch, and this paper discusses only side A. >

Mohsen Zeidi-kulehparcheh - One of the best experts on this subject based on the ideXlab platform.

  • Plant use in three Pre-Pottery Neolithic sites of the northern and eastern Fertile Crescent: a preliminary report
    Vegetation History and Archaeobotany, 2012
    Co-Authors: Simone Riehl, Marion Benz, Nicholas J. Conard, Hojjat Darabi, Katleen Deckers, Hassan Fazeli Nashli, Mohsen Zeidi-kulehparcheh
    Abstract:

    The beginnings of agriculture throughout the Fertile Crescent are still not completely understood, particularly at the eastern end of the Fertile Crescent in the area of modern Iran. Archaeobotanical samples from Epipalaeolithic/PPNA Körtik Tepe in southeastern Turkey and from the Pre-Pottery Neolithic sites of Chogha Golan and East Chia Sabz in south western Iran were studied in order to define the status of cultivation at these sites. Preliminary results show the presence of abundant wild progenitor species of crops at the Iranian sites before 10600 cal. b.p. , and very few wild progenitor species at Körtik Tepe dated to 11700–11250 cal. b.p. The Iranian sites also indicate size increase of wild barley grain across a sequence of 400 years through either cultivation or changing moisture conditions.

G.s. Hayne - One of the best experts on this subject based on the ideXlab platform.

  • Prelaunch performance of the NASA altimeter for the TOPEX/Poseidon project
    IEEE Transactions on Geoscience and Remote Sensing, 1993
    Co-Authors: P.c. Marth, G.s. Hayne, D.w. Hancock, C.l. Purdy, C. C. Kilgus, J.r. Jensen, J.a. Perschy, J.l. Macarthur, L. C. Rossi, C.j. Koblinsky
    Abstract:

    The TOPEX/Poseidon radar altimeter satellite applies advances in remote sensing instrumentation to reduce long wavelength measurement errors to dramatically lower levels. The TOPEX altimeter measures the range to the ocean surface with 2-cm precision and accuracy through the use of both Ku- and C-band radars, a high pulse repetition frequency, an agile tracker, and absolute internal height calibration. Dual pulse bandwidths for both frequencies make it possible to quickly acquire the surface and begin tracking after crossing the land/ocean boundary. The altimeter requirements and the elements of the altimeter design that have resulted in meeting these requirements are presented. Prelaunch test data, based on the use of a radar altimeter system evaluator to simulate the backscatter from the ocean surface, are presented to demonstrate that the TOPEX altimeter will meet these requirements and provide the data necessary to the understanding of basin scale mean circulation. >

  • NASA radar altimeter for the TOPEX/POSEIDON Project
    Proceedings of the IEEE, 1991
    Co-Authors: A.r. Zieger, G.s. Hayne, D.w. Hancock, C.l. Purdy
    Abstract:

    The TOPEX/POSEIDON Project is a joint US and French mission to develop and operate an Earth-orbiting satellite with sensors capable of making accurate measurements of sea level. The NASA radar altimeter (NRA), a fifth-generation US Altimeter, will provide the primary measurement for the TOPEX/POSEIDON Project altimetric mission. The authors present the requirements, altimeter fundamentals, design description, integration and test program, primary elements of ground processing, and assessment for the dual-frequency NASA radar altimeter. >

  • Engineering performance analysis of the TOPEX radar altimeter
    Proceedings of IGARSS '94 - 1994 IEEE International Geoscience and Remote Sensing Symposium, 1
    Co-Authors: G.s. Hayne, D.w. Hancock, C.l. Purdy
    Abstract:

    Describes the Wallops Flight Facility continuing work in engineering performance analysis for the NASA radar altimeter of the TOPEX/POSEIDON mission (referred to simply as the TOPEX altimeter). Because an altimeter measuring range at two frequencies allows the ionosphere-caused error to be corrected, the TOPEX altimeter comprises a primary radar altimeter at Ku-band (13.6 GHz) and a secondary radar altimeter at C-band (5.3 GHz). For the TOPEX Ku and C altimeters the authors report performance and calibration results for range and for the radar surface backscattering cross-section /spl sigma//sup 0/. Except for the antenna the TOPEX altimeter has two redundant systems, sides A and B. Only side A has been operated since launch, and this paper discusses only side A. >

D.w. Hancock - One of the best experts on this subject based on the ideXlab platform.

  • Prelaunch performance of the NASA altimeter for the TOPEX/Poseidon project
    IEEE Transactions on Geoscience and Remote Sensing, 1993
    Co-Authors: P.c. Marth, G.s. Hayne, D.w. Hancock, C.l. Purdy, C. C. Kilgus, J.r. Jensen, J.a. Perschy, J.l. Macarthur, L. C. Rossi, C.j. Koblinsky
    Abstract:

    The TOPEX/Poseidon radar altimeter satellite applies advances in remote sensing instrumentation to reduce long wavelength measurement errors to dramatically lower levels. The TOPEX altimeter measures the range to the ocean surface with 2-cm precision and accuracy through the use of both Ku- and C-band radars, a high pulse repetition frequency, an agile tracker, and absolute internal height calibration. Dual pulse bandwidths for both frequencies make it possible to quickly acquire the surface and begin tracking after crossing the land/ocean boundary. The altimeter requirements and the elements of the altimeter design that have resulted in meeting these requirements are presented. Prelaunch test data, based on the use of a radar altimeter system evaluator to simulate the backscatter from the ocean surface, are presented to demonstrate that the TOPEX altimeter will meet these requirements and provide the data necessary to the understanding of basin scale mean circulation. >

  • NASA radar altimeter for the TOPEX/POSEIDON Project
    Proceedings of the IEEE, 1991
    Co-Authors: A.r. Zieger, G.s. Hayne, D.w. Hancock, C.l. Purdy
    Abstract:

    The TOPEX/POSEIDON Project is a joint US and French mission to develop and operate an Earth-orbiting satellite with sensors capable of making accurate measurements of sea level. The NASA radar altimeter (NRA), a fifth-generation US Altimeter, will provide the primary measurement for the TOPEX/POSEIDON Project altimetric mission. The authors present the requirements, altimeter fundamentals, design description, integration and test program, primary elements of ground processing, and assessment for the dual-frequency NASA radar altimeter. >

  • Engineering performance analysis of the TOPEX radar altimeter
    Proceedings of IGARSS '94 - 1994 IEEE International Geoscience and Remote Sensing Symposium, 1
    Co-Authors: G.s. Hayne, D.w. Hancock, C.l. Purdy
    Abstract:

    Describes the Wallops Flight Facility continuing work in engineering performance analysis for the NASA radar altimeter of the TOPEX/POSEIDON mission (referred to simply as the TOPEX altimeter). Because an altimeter measuring range at two frequencies allows the ionosphere-caused error to be corrected, the TOPEX altimeter comprises a primary radar altimeter at Ku-band (13.6 GHz) and a secondary radar altimeter at C-band (5.3 GHz). For the TOPEX Ku and C altimeters the authors report performance and calibration results for range and for the radar surface backscattering cross-section /spl sigma//sup 0/. Except for the antenna the TOPEX altimeter has two redundant systems, sides A and B. Only side A has been operated since launch, and this paper discusses only side A. >