نتایج جستجو برای: star track
تعداد نتایج: 139036 فیلتر نتایج به سال:
During observations with the Rossi X-Ray Timing Explorer from 1997 June 31 to July 3 we discovered two simultaneous kHz quasi-periodic oscillations (QPOs) near 500 and 860 Hz in the low-mass X-ray binary and Z source Cygnus X-2. In the X-ray color-color diagram and hardness-intensity diagram (HID), a clear Z track was traced out, which shifted in the HID within 1 day to higher count rates at th...
the atom-bond connectivity index of graph is a topological index proposed by estrada et al.as abc (g) uve (g ) (du dv 2) / dudv , where the summation goes over all edges ofg, du and dv are the degrees of the terminal vertices u and v of edge uv. in the present paper,some upper bounds for the second type of atom-bond connectivity index are computed.
بیان مساله: اخیرا محققان روشهایی را برای کاهش انقباض پلیمریزاسیون ترمیم های کامپوزیتی ارائه نموده اند و مدعی هستند با قدرتهای بالاتر انرژی دستگاههای لایت کیور و تغییر الگوی تابش اشعه خواص مکانیکی ترمیم و بهبود می یابد و در عین حال ریزنشت آن نیز کاهش می یابد. هدف: این مطالعه با هدف بررسی اثر دو روش سخت کنندگی soft-start و pulse-delay بر میزان ریزنشت و درجه تبدیل ترمیم های کامپوزیتی انجام شد. روش...
The SchwartzReport tracks emerging trends that will affect the world, particularly the United States. For EXPLORE it focuses on matters of health in the broadest sense of that term, including medical issues, changes in the biosphere, technology, and policy considerations, all of which will shape our culture and our lives.
In Egypt, girls have traditionally been educationally disadvantaged. This disadvantage, however, has been focused on the failure to enter school. Increasingly it is recognized that girls who ever-enroll are at least as likely to complete primary and secondary education as boys. Still the belief persists that girls, especially those from poor families, will be disadvantaged in terms of school ex...
In this work, we carry out self –similar solutions of viscous-resistive accretion flows around a magnetized compact object. We consider an axi-symmetric, rotating, isothermal steady accretion flow, which contains a poloidal magnetic field of the central star. The dominant mechanism of energy dissipation is assumed to be the turbulence viscosity and magnetic diffusivity due to the magnetic field...
This paper provides a brief description of a constraint-based solver that was applied by the author to the problem instances in all three tracks of the International Timetabling Competition 2007.
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