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NUCLEAR ENERGY MATERIALS PREDICTION: APPLICATION OF THE MULTI-SCALE MODELLING PARADIGM
Samaras, Maria,Victoria, Maximo,Hoffelner, Wolfgang Korean Nuclear Society 2009 Nuclear Engineering and Technology Vol.41 No.2
The safe and reliable performance of fusion and fission plants depends on the choice of suitable materials and an assessment of long-term materials degradation. These materials are degraded by their exposure to extreme conditions; it is necessary, therefore, to address the issue of long-term damage evolution of materials under service exposure in advanced plants. The empirical approach to the study of structural materials and fuels is reaching its limit when used to define and extrapolate new materials, new environments, or new operating conditions due to a lack of knowledge of the basic principles and mechanisms present. Materials designed for future Gen IV systems require significant innovation for the new environments that the materials will be exposed to. Thus, it is a challenge to understand the materials more precisely and to go far beyond the current empirical design methodology. Breakthrough technology is being achieved with the incorporation in design codes of a fundamental understanding of the properties of materials. This paper discusses the multi-scale, multicode computations and multi-dimensional modelling undertaken to understand the mechanical properties of these materials. Such an approach is envisaged to probe beyond currently possible approaches to become a predictive tool in estimating the mechanical properties and lifetimes of materials.
NUCLEAR ENERGY MATERIALS PREDICTION: APPLICATION OF THE MULTI-SCALE MODELLING PARADIGM
Samaras, Maria,Victoria, Maximo,Hoffelner, Wolfgang Korean Nuclear Society 2009 Nuclear Engineering and Technology Vol.41 No.1
The safe and reliable performance of fusion and fission plants depends on the choice of suitable materials and an assessment of long-term materials degradation. These materials are degraded by their exposure to extreme conditions; it is necessary, therefore, to address the issue of long-term damage evolution of materials under service exposure in advanced plants. The empirical approach to the study of structural materials and fuels is reaching its limit when used to define and extrapolate new materials, new environments, or new operating conditions due to a lack of knowledge of the basic principles and mechanisms present. Materials designed for future Gen IV systems require significant innovation for the new environments that the materials will be exposed to. Thus, it is a challenge to understand the materials more precisely and to go far beyond the current empirical design methodology. Breakthrough technology is being achieved with the incorporation in design codes of a fundamental understanding of the properties of materials. This paper discusses the multi-scale, multi-code computations and multi-dimensional modelling undertaken to understand the mechanical properties of these materials. Such an approach is envisaged to probe beyond currently possible approaches to become a predictive tool in estimating the mechanical properties and lifetimes of materials.
NUCLEAR ENERGY MATERIALS PREDICTION: APPLICATION OF THE MULTI-SCALE MODELLING PARADIGM
MARIA SAMARAS,MAXIMO VICTORIA,WOLFGANG HOFFELNER 한국원자력학회 2009 Nuclear Engineering and Technology Vol.41 No.1
The safe and reliable performance of fusion and fission plants depends on the choice of suitable materials and an assessment of long-term materials degradation. These materials are degraded by their exposure to extreme conditions; it is necessary, therefore, to address the issue of long-term damage evolution of materials under service exposure in advanced plants. The empirical approach to the study of structural materials and fuels is reaching its limit when used to define and extrapolate new materials, new environments, or new operating conditions due to a lack of knowledge of the basic principles and mechanisms present. Materials designed for future Gen IV systems require significant innovation for the new environments that the materials will be exposed to. Thus, it is a challenge to understand the materials more precisely and to go far beyond the current empirical design methodology. Breakthrough technology is being achieved with the incorporation in design codes of a fundamental understanding of the properties of materials. This paper discusses the multi-scale, multicode computations and multi-dimensional modelling undertaken to understand the mechanical properties of these materials. Such an approach is envisaged to probe beyond currently possible approaches to become a predictive tool in estimating the mechanical properties and lifetimes of materials.
Bauer, Francois,Eyraud, Lucien,Samara, George A.,Seung Tae Choi IEEE 2015 IEEE transactions on dielectrics and electrical in Vol.22 No.3
<P>In this paper, we will present electromechanical behavior of the poly(vinylidene fluoridetrifluoroethylene- 1,1-chlorofluoroethylene) [P(VDF-TrFE-CFE)] terpolymer under hydrostatic pressure. The dielectric data obtained under controlled hydrostatic pressure suggest a reversible pressure-induced crossover from the relaxor state to a ferroelectric state in the terpolymer (PVDF/TrFE/CFE 64.3/27.6/8.1 mol %). It was also observed that the P(VDF-TrFE-CFE) terpolymer quenched in ice water shows ferroelectric-like hysteresis loop. These results have led us to the theoretical analysis of a charged sphere, with which it was estimated that the change of a bipolar state of nanoparticles in a terpolymer matrix to a unipolar state due to a possible ionization of the medium under applied electric field could induce electrostatic pressure high enough to generate relaxor-to-ferroelectric crossover. The hysteresis loop of polymer-modified reduced graphene oxide/poly(vinylidene fluoride-trifluoroethylene-clorotrifluoroethylene) terpolymer nanocomposite was also measured to ensure that the relaxor-to-ferroelectric crossover may take place in the nanocomposite.</P>
The traditional Greek cheese Tsalafouti: history, technology, nutrition and gastronomy
Malissiova Eleni,Meleti Ermioni,Samara Antonia,Alexandraki Maria,Manouras Athanasios 한국식품연구원 2023 Journal of Ethnic Foods Vol.10 No.18
Tsalafouti is an ‘’unknown’’ Greek traditional cheese with great potential for getting Protected Designation of Origin accreditation and leading entrepreneurship in the area of origin. This study aimed to collect and comprehensively analyse valuable data on the history, technology, nutrition and gastronomy of Tsalafouti. A study survey was designed and 8 out of 13 Tsalafouti producers in Greece participated, providing data on Tsalafouti’s technology, quality, nutrition and history. It was revealed that there currently are some variations in Tsalafouti’s production, while the end product is of special nutritional (low in fat) and gastronomic attributes. In any case, it is apparent that food heritage and specifcally dairy products heritage can possibly act as a tool for entrepreneurship, given that the special attributes that Tsalafouti may hold will be highlighted and further evidenced.
Ghosh, Saptarshi,Sarkar, Shreyasee,Simhareddy, Samara,Kotne, Sivasankar,Rao, Pammidimukkala Bramh Ananda,Turlapati, Satya Prakash Venkatachalam Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.18
Background: Breast cancer is the most common malignancy in women worldwide and the second most common cancer in females in India. Receptor status may be important for survival. Objective: To analyse and correlate the clinical and morphological parameters with receptor status in breast carcinoma patients in a tertiary care institution in Southern India. Materials and Methods: This retrospective study involved 320 patients of breast cancer diagnosed in an oncology hospital over a period of $3^{1/2}$ years. Data was analysed using SPSS Version 21. Results: Some 60.6% patients with breast carcinomas belonged to the age group of 40 to 60 years. The most common histological type was infiltrating ductal carcinoma, not otherwise specified, accounting for 84.4% of patients. On immunohistochemistry, estrogen receptor (ER) and progesterone receptor (PR) were expressed in 56.3% and 53.1% of cases, respectively. Conclusions: Breast cancers in India, a developing country, occur in younger women and tend to be more aggressive with lower rates of ER and PR expression and higher histological tumor grades. Both ER and PR status of the tumors had significant associations with the patient age, pathological TNM stage and histological tumor grade.
Hamdi Riheb,Haik Yousef,Hayek Saleh S.,Samara Ayman,Mansour Said A. 한국물리학회 2021 Current Applied Physics Vol.28 No.-
Based on the evolution of the quantity of Sr in Pr0.63Dy0.37-xSrxMnO3 (x = 0.00 and x = 0.30) systems and the different heat treatments (500, 800 and 1300 ◦C), various physical changes are illustrated by these samples. Xray diffraction patterns were carried out revealing that the heat temperature can affect the structure of the systems. Zero-Field-Cooled and Field-Cooled magnetizations revealed the appearance of different magnetic transitions; from the paramagnetic state to the antiferromagnetic one. Once increasing the temperature of heat up to 1300 ◦C and for x = 0.30, the system presents a ferromagnetic order at Curie temperature that is around 200 K. Magnetic hysteresis loops confirm the transitions presented by the magnetic measurements. The heating temperature affected also the evolution of the magnetic entropy change. All samples show an important increase in the data values of the maximum of the magnetic entropy change while augmenting the applied magnetic field. We note an important result that is the refrigerant capacity of the x = 0.30 sample heated at 1300 ◦C is 725% compared to that at 500 ◦C.