Search for: ansari--r
Article Proceedings of Science, 18 August 2008 through 22 August 2008, Stockholm ; 2008 ; 18248039 (ISSN) ; Ansari, R ; Habibi, F ; Sharif University of Technology
Considering the results of baryonic compact massive objects searches through microlensing , cool molecular hydrogen (H2 - He) clouds should now be seriously considered as a possible major component of the Galactic hidden matter. It has been suggested that a hierarchical structure of cold H 2 could fill the Galactic thick disk  or halo , providing a solution for the Galactic hidden matter problem. This gas should form transparent "clumpuscules" of ∼ 10 AU size, with a column density of 1024-25cm-2, and a surface filling factor smaller than 1%. The OSER project (Optical Scintillation by Extraterrestrial Refractors) is proposed to search for scintillation of extra-galactic sources...
Article Astronomy and Astrophysics ; Volume 552, Article No. A93 , 2013 ; 00046361 (ISSN) ; Moniez, M ; Ansari, R ; Rahvar, S ; Sharif University of Technology
Aims. Stars twinkle because their light propagates through the atmosphere. The same phenomenon is expected on a longer time scale when the light of remote stars crosses an interstellar turbulent molecular cloud, but it has never been observed at optical wavelengths. The aim of the study described in this paper is to fully simulate the scintillation process, starting from the molecular cloud description as a fractal object, ending with the simulations of fluctuating stellar light curves. Methods. Fast Fourier transforms are first used to simulate fractal clouds. Then, the illumination pattern resulting from the crossing of background star light through these refractive clouds is calculated...
Searching for galactic hidden gas through interstellar scintillation: Results from a test with the NTT-SOFI detector, Article Astronomy and Astrophysics ; Volume 525, Issue 6 , 2010 ; 00046361 (ISSN) ; Moniez, M ; Ansari, R ; Rahvar, S ; Sharif University of Technology
Aims. Stars twinkle because their light propagates through the atmosphere. The same phenomenon is expected at a longer time scale when the light of remote stars crosses an interstellar molecular cloud, but it has never been observed at optical wavelength. In a favorable case, the light of a background star can be subject to stochastic fluctuations on the order of a few percent at a characteristic time scale of a few minutes. Our ultimate aim is to discover or exclude these scintillation effects to estimate the contribution of molecular hydrogen to the Galactic baryonic hidden mass. This feasibility study is a pathfinder toward an observational strategy to search for scintillation, probing...
Article Astronomy and Astrophysics ; Volume 412, Issue 1 , 2003 , Pages 81-90 ; 00046361 (ISSN) ; Moniez, M ; Ansari, R ; Perdereau, O ; Sharif University of Technology
EDP Sciences 2003
In this article, we have investigated the possibility to distinguish between different galactic models through microlensing parallax studies. We show that a systematic search for parallax effects can be done using the currently running alert systems and complementary photometric telescopes, to distinguish between different lens distance distributions. We have considered two galactic dark compact object distributions, with total optical depths corresponding to the EROS current upper limits. These models correspond to two extreme hypotheses on a three component galactic structure made of a thin disk, a thick disk, and a spherically symmetric halo. Our study shows that for sub-solar mass...
Article Astronomy and Astrophysics ; Volume 604 , 2017 ; 00046361 (ISSN) ; Sajadian, S ; Karami, M ; Rahvar, S ; Ansari, R ; Sharif University of Technology
EDP Sciences 2017
Aims. EROS (Expérience de Recherche d'Objets Sombres) has searched for microlensing toward four directions in the Galactic plane away from the Galactic center. The interpretation of the catalog optical depth is complicated by the spread of the source distance distribution. We compare the EROS microlensing observations with Galactic models (including the Besançon model), tuned to fit the EROS source catalogs, and take into account all observational data such as the microlensing optical depth, the Einstein crossing durations, and the color and magnitude distributions of the catalogued stars. Methods. We simulated EROS-like source catalogs using the HIgh-Precision PARallax COllecting Satellite...
Article Proceedings of the International Astronomical Union ; Volume 7, Issue S285 , 2011 , Pages 376-378 ; 17439213 (ISSN) ; 9781107019850 (ISBN) ; Ansari, R ; Habibi, F ; Rahvar, S ; Griffin R. E ; Hanisch R. J ; Seaman R. L ; Sharif University of Technology
Stars twinkle because their light propagates through the atmosphere. The same phenomenon is expected when the light of remote stars crosses a Galactic - disk or halo - refractive medium such as a molecular cloud. We present the promising results of a test performed with the ESO-NTT, and consider its potential
The global, regional, and national burden of colorectal cancer and its attributable risk factors in 195 countries and territories, 1990–2017: a systematic analysis for the global burden of disease study 2017, Article The Lancet Gastroenterology and Hepatology ; Volume 4, Issue 12 , 2019 , Pages 913-933 ; 24681253 (ISSN) ; Sepanlou, S. G ; Ikuta, K. S ; Bisignano, C ; Salimzadeh, H ; Delavari, A ; Ansari, R ; Roshandel, G ; Merat, S ; Fitzmaurice, C ; Force, L. M ; Nixon, M. R ; Abbastabar, H ; Abegaz, K. H ; Afarideh, M ; Ahmadi, A ; Ahmed, M. B ; Akinyemiju, T ; Alahdab, F ; Ali, R ; Alikhani, M ; Alipour, V ; Aljunid, S. M ; Almadi, M. A. H ; Almasi Hashiani, A ; Al Raddadi, R. M ; Alvis Guzman, N ; Amini, S ; Anber, N. H ; Ansari Moghaddam, A ; Arabloo, J ; Arefi, Z ; Asghari Jafarabadi, M ; Azadmehr, A ; Badawi, A ; Baheiraei, N ; Bärnighausen, T. W ; Basaleem, H ; Behzadifar, M ; Behzadifar, M ; Belayneh, Y. M ; Berhe, K ; Bhattacharyya, K ; Biadgo, B ; Bijani, A ; Biondi, A ; Bjorge, T ; Borzi, A.M ; Bosetti, C ; Bou-Orm, I. R ; Brenner, H ; Briko, A. N ; Briko, N. I ; Carreras, G ; Carvalho, F ; Castaneda-Orjuela, C. A ; Cerin, E ; Chiang, P. P. C ; Chido Amajuoyi, O. G ; Daryani, A ; Davitoiu, D. V ; Demoz, G. T ; Desai, R ; Dianati Nasab, M ; Eftekhari, A ; El Sayed, I ; Elbarazi, I ; Emamian, M. H ; Endries, A. Y ; Esmaeilzadeh, F ; Esteghamati, A ; Etemadi, A ; Farzadfar, F ; Fernandes, E ; Fernandes, J. C ; Filip, I ; Fischer, F ; Foroutan, M ; Gad, M. M ; Gallus, S ; Ghaseni Kebria, F ; Ghashghaee, A ; Gorini, G ; Hafezi Nejad, N ; Haj Mirzaian, A ; Hasanpour Heidari, S ; Hasanzadeh, A ; Hassanipour, S ; Hay, S. I ; Hoang, C. L ; Hostiuc, M ; Househ, M ; Ilesanmi, O. S ; Ilic, M. D ; Innos, K ; Irvani, S. S. N ; Islami, F ; Jaca, A ; Jafari Balalami, N ; Jafari Delouei, N ; Jafarinia, M ; Jahani, M. A ; Jakovljevic, M ; James, S. L ; Javanbakht, M ; Jenabi, E ; Jha, R. P ; Joukar, F ; Kasaeian, A ; Kassa, T. D ; Kassaw, M. W ; Kengne, A. P ; Khader, Y. S ; Khaksarian, M ; Khalilov, R ; Khan, E. A ; Khayamzadeh, M ; Khazaee-Pool, M ; Khazaei, S ; Khosravi Shadmani, F ; Khubchandani, J ; Kim, D ; Kisa, A ; Kisa, S ; Kocarnik, J. M ; Komaki, H ; Kopec, J. A ; Koyanagi, A ; Kuipers, E. J ; Kumar, V ; La Vecchia, C ; Lami, F. H ; Lopez, A. D ; Lopukhov, P. D ; Lunevicius, R ; Majeed, A ; Majidinia, M ; Manafi, A ; Manafi, N ; Manda, A. L ; Mansour Ghanaei, F ; Mantovani, L. G ; Mehta, D ; Meier, T ; Meles, H. G ; Mendoza, W ; Mestrovic, T ; Miazgowski, B ; Miazgowski, T ; Mir, S. M ; Mirzaei, H ; Mohammad, K. A ; Mohammad Gholi Mezerji, N ; Mohammadian Hafshejani, A ; Mohammadoo Khorasani, M ; Mohammed, S ; Mohebi, F ; Mokdad, A. H ; Monasta, L ; Moossavi, M ; Moradi, G ; Moradpour, F ; Moradzadeh, R ; Nahvijou, A ; Naik, G ; Najafi, F ; Nazari, J ; Negoi, I ; Negru, S ; Nguyen, C. T ; Nguyen, T. H ; Ningrum, D. N. A ; Ogbo, F. A ; Olagunju, A. T ; Olagunju, T. O ; Pana, A ; Pereira, D. M ; Pirestani, M ; Pourshams, A ; Poustchi, H ; Qorbani, M ; Rabiee, M ; Rabiee, N ; Radfar, A ; Rahmati, M ; Rajati, F ; Raoofi, S ; Rawaf, D. L ; Rawaf, S ; Reiner, R. C ; Renzaho, A. M. N ; Rezaei, N ; Rezapour, A ; Saad, A. M ; Saadatagah, S ; Saddik, B ; Salehi, F ; Zahabi, S. S ; Salz, I ; Samy, A. M ; Sanabria, J ; Santric Milicevic, M. M ; Sarveazad, A ; Satpathy, M ; Schneider, I. J. C ; Sekerija, M ; Shaahmadi, F ; Shabaninejad, H ; Shamsizadeh, M ; Sharafi, Z ; Sharif, M ; Sharifi, A ; Sheikhbahaei, S ; Shirkoohi, R ; Siddappa Malleshappa, S. K ; Silva, D. A. S ; Sisay, M ; Smarandache, C. G ; Soofi, M ; Soreide, K ; Soshnikov, S ; Starodubov, V. I ; Tabares Seisdedos, R ; Sullman, M ; Taherkhani, A ; Tesfay, B. E ; Topor Madry, R ; Traini, E ; Tran, B. X ; Tran, K. B ; Ullah, I ; Uthman, O. A ; Vacante, M ; Vahedian Azimi, A ; Valli, A ; Varavikova, E ; Vujcic, I. S ; Westerman, R ; Yazdi Feyzabadi, V ; Yisma, E ; Yu, C ; Zadnik, V ; Zahirian Moghadam, T ; Zaki, L ; Zandian, H ; Zhang, Z. J ; Murray, C. J. L ; Naghavi, M ; Malekzadeh, R ; GBD 2017 Colorectal Cancer Collaborators ; Sharif University of Technology
Elsevier Ltd 2019
Background: Data about the global, regional, and country-specific variations in the levels and trends of colorectal cancer are required to understand the impact of this disease and the trends in its burden to help policy makers allocate resources. Here we provide a status report on the incidence, mortality, and disability caused by colorectal cancer in 195 countries and territories between 1990 and 2017. Methods: Vital registration, sample vital registration, verbal autopsy, and cancer registry data were used to generate incidence, death, and disability-adjusted life-year (DALY) estimates of colorectal cancer at the global, regional, and national levels. We also determined the association...