نتایج جستجو برای: leo
تعداد نتایج: 5601 فیلتر نتایج به سال:
تابش های موجود در محیط پرتوی فضا در مدار leo که پروتون ها سهم عمدۀ آن ها را تشکیل می دهند، آثار مخربی بر روی قطعات الکترونیکی بر جای می گذارند. در این مقاله، اثر آسیب یونیزان پروتون ها بر روی قطعات الکترونیکی ماهواره ای که در مدار leo حرکت می کند، بررسی شد. با بررسی های انجام شده بر روی مدارهای leo توسط نرم افزار shieldose، بدترین سناریوی مطرح برای یک ماهواره، مورد ارزیابی قرار گرفت. با توجه به...
Low Earth Orbit (LEO) satellite networks will play an important role in the evolving information infrastructure. Satellites in the low earth orbits provide communication with shorter end-to-end delays and efficient frequency usage. However, some problems need to be solved before LEO satellite systems can be successfully deployed. One of these problems is the handover management. The objective o...
1 Editorial: Dentin Leo Tjäderhane 3 Dentin basic structure and composition—an overview Leo Tjäderhane, Marcela R. Carrilho, Lorenzo Breschi, Franklin R. Tay & David H. Pashley 30 Microstructure and mechanical behavior of radicular and coronal dentin Dwayne Arola, Juliana Ivancik, Hessam Majd, Ashraf Fouad, Devendra Bajaj, Xiu-Yin Zhang & Naomi Eidelman 52 The dentin–pulp border: a dynamic inte...
In this paper, we survey techniques for routing and performance analysis of Low Earth Orbit (LEO) systems. We first review the basic structure of LEO satellite communications and present the main characteristics of LEO systems. The dynamic characteristics of LEO systems make the performance analysis and routing problem quite complicated. In this study, we review some of the proposed solutions t...
Four in vitro experiments (Exp.) were conducted to evaluate lavender essential oil (LEO) effects at 0 (control), 250 (low dose), 500 (medium dose), 750 and 1000 µL per L (high doses) of incubation medium on rumen gas production kinetics (Exp.1), ruminal digestibility and fermentation (Exp.2), methane production (Exp.3) and rumen acidosis (Exp.4). The asymptote of gas production (A) increased qu...
Abstmct Satellite networks provide global coverage and support a wide range of services. Low Earth Orbit (LEO) satellites provide short round trip delays and are becoming increasingly important. One of the challenges in LEO satellite networks is the development of specialized and efflcient routing algorithms. In this work, a datagram routing algorithm for LEO satellite networks is introduced. T...
We report the discovery of a new Milky Way satellite in the constellation Leo, identified in data from the Sloan Digital Sky Survey. It lies at a distance of ∼ 180 kpc, and is separated by . 3 from another recent discovery, Leo IV. We present follow-up imaging from the Isaac Newton Telescope and spectroscopy from the Hectochelle fiber spectrograph at the Multiple Mirror Telescope. Leo V’s helio...
Low Earth Orbit (LEO) satellites are used for public networking and for scientific purposes. Communication via satellite begins when the satellite is positioned in its orbital position. Ground stations can communicate with LEO satellites only when the satellite is in their visibility region. The duration of the visibility and the communication vary for each LEO satellite pass over the station, ...
A change in brand suppliers of heparin at our institution resulted in a number of anecdotal reports of possible differences in potency. Both products are marketed as heparin sodium extracted from porcine intestinal mucosa. Heparin Leo is 1000 international units (British Pharmacopeia) per ml. while Hepalean is 10,000 United States Pharmacopeia (U.S.P) units per ml. Perfusion records were retros...
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