The Damped Ly-α (DLA) absorber at redshift zabs = 4.383 observed toward QSO BRI 1202-0725 is studied by means of high resolution (FWHM ≈ 7 km s) VLT-UVES spectra. We refine a previously determined Si abundance and derive with confidence abundances for C, N and O which are poorly known in DLAs. The [O/Fe] ratio is ∼ 0.6, but we cannot establish if iron is partially locked into dust grains. The [...

در این مقاله یک مدل ریاضی برای مسئله سیستم تولیدی همکارانه ساخت بر اساس سفارش با رعایت انصاف تخصیص بار‌های تولید طراحی شده است. اهداف اصلی مدل، کمینه‌سازی هزینه‌‌های کل و حداکثر استفاده از منابع به‌منظور عادلانه شرایط عدم­قطعیت کنترل پارامتر‌های غیرقطعی روش برنامه‌ریزی فازی ‌شده نتایج نشان می‌دهد افزایش نرخ عدم‌قطعیت، می­یابد. ازآنجاکه ظرفیت کارخانه‌ها ثابت است، مقدار تقاضا، هر کارخانه نیز می­ی...

Abstract The Belt and Road Initiative (BRI) mobilizes Chinese construction investment in developing countries. Ethiopia is Africa's “model” BRI country, due to China's elaborate infrastructure financing building its many manufacturing enterprises. Based on field documentary research, we examine the BRI's meaning, as understood from perspective of Ethiopia, comparison China-oriented studies. We ...

In recent years, the “Belt and Road Initiative” (BRI) promoted by Chinese government has attracted a significant amount of international trade transnational investment other businesses. Accordingly, country risk assessment should be granted priority in decision-making process for these projects. Based on comprehensive consideration important relevant countries availability data along BRI, this ...

In this paper, we investigate the usage of machine learning in the detection and recognition of double stars. To do this, numerous images including one star and double stars are simulated. Then, 100 terms of Zernike expansion with random coefficients are considered as aberrations to impose on the aforementioned images. Also, a telescope with a specific aperture is simulated. In this work, two k...