Commercial operating systems have recently introduced mandatory access controls (MAC) that can be used to ensure system-wide data confidentiality and integrity. These protections rely on restricting the flow of information between processes based on security levels. The problem is, there are many applications that defy simple classification by security level, some of them essential for system o...

صفحه‌­ی مینیاتوری LEU پرتودهی شده در رآکتور تحقیقاتی تهران که برای تولید رادیوایزوتوپ مولیبدن-99 استفاده می‌شود، منبع پرتوزایی متشکل از رادیوایزوتوپ‌های مختلف است. محاسبه و تخمین آهنگ دز تابش‌های گامای گسیلی این منبع، به منظور مقایسه با مقادیر مجاز توصیه حمل‌ونقل مواد پرتوزا حفاظت پرتویی کارکنان حین انجام تست‌های آزمایشگاهی داغ، پیش هر اقدام عملی، امری ضروری مقاله، اعتبار یک روش پیشنهادی جهت هد...

The SIESTA suite of programs allows periodic density functional theory calculations to be carried out on system sizes of several hundred atoms. Here we make use of this to study the interface between Au and MgO surfaces. Atomic Au on MgO(100) shows preferential binding over surface anion sites, while the binding energy at a surface anion vacancy is significantly higher than on the stoichiometri...

The spin-polarization at the V~001! surface has been studied by using different local @local spin-density approximation ~LSDA!# and semilocal @generalized gradient approximation ~GGA#! approximations to the exchange-correlation potential of DFT within two ab initio methods: the all-electron tight-binding linear muffin-tin orbital atomic-sphere approximation and the pseudopotential linear combin...

A programmable simulation environment for semiconductor technology analysis is presented. The SIESTA project sets out to combine the advantages of a comfortable, intuitive visual user interface with the flexibility and versatility of a high-level programming language. It is designed to provide a set of framework services to ensure a straight-forward definition of complex technology analysis tas...