Nowadays, the precise modeling of a nuclear reactor core is a challenge. This task involves several aspects, from the computational power needed to perform simulations, to the physics and analysis of the outcome. The need to better understand the physical phenomena is critical in order to quantify and qualify nuclear safety parameters. Currently, substantial research has been done in order to o...

This paper describes and illustrates a methodology for identifying the correctness of software functional requirements on the basis of a logic-based dynamic framework. It focuses on the issues related to user and/or system functional requirements; quality attributes, measures and analysis methods, and integrates the core concepts of the Graphical Requirement Analysis (GRA) and COSMIC-FFP techni...

Since its advent, thèjust{in{time'{paradigm has considerable innu-ence on production planning and control. While originally employed for high{volume production, `just{in{time'{concepts are meanwhile documented for low{volume, make{to{order production as well. An example is the assembly of multiple customer{speciic products as recently considered by Agrawal et al. The problem has been inspired b...

In 1997 the most prestigious high school science fair in the United States—the Westinghouse Science Competition [Berger 94] —was won by Adam Cohen, then a senior at Hunter High School in New York City. Cohen's project, "Near-Field Photolithography", involved the construction of a home-built scanning tunneling microscope (or STM—a high-resolution microscope that uses the extent of quantum tunnel...

In a pressurized water reactor (PWR) nuclear power plants (NPPs) the pressure control in the primary loop is very important for keeping the reactor in a safety condition and improve the generation process efficiency. The main component responsible for this task is the pressurizer. The pressurizer pressure control system (PPCS) utilizes heaters and spray valves to maintain the pressure within an...

Aluminum-containing phases represent the most prevalent solids that can appear or disappear during the processing of radioactive tank wastes. Processes such as sludge washing and leaching are designed to dissolve Al-containing phases and, thereby, minimize the volume of high-level waste glass required to encapsulate radioactive sludges. Unfortunately, waste-processing steps that include evapora...

In this research accumulative roll bonding process as sever plastic deformation process was applied up to 8 cycles to produce the ultrafine grain copper. Microstructure of cycle 1, cycle 4 and cycle 8 investigated by TEM images. By analyzing TEM images the grain size measured below 100 nm in cycle 8 and it was with an average grain size of 200 nm. Corrosion resistance of rolled copper stri...


 The original method for the nuclear safety analysis is given. based on an adequate interpretation of conditions changes temperature fuel elements and claddings in process power plants modernization. limitations cladding made structural material are analyzed. A conservative criteria proposed. according to element its obtained. proposed does not require modeling all possible sequences usin...

cytotoxicity evaluation of daphne mucronata (thymelaeaceae) extract and one of its active purified components, using seven different cancerous cell lines, revealed the strong antiproliferative activity of the plant. using flow cytometry technique, it was found that treatment of the most responsive cells (k562) with the plant extract or the active component inhibited the progression of cells thr...

background: various uterine disorders lead to infertility in women of reproductive ages. this study was performed to describe common uterine causes of infertility and sonographic evaluation of them for midwives.   methods:to study the literatures, manuscripts published at “pubmed”, “elsevier”, “google scholar”, “sid” and original text books, between 1985 and 2015, were carefully reviewed, using...