•Neutronic modeling and calculation of the C5G7 Benchmark.•Analysis of the C5G7 Benchmark using the Characteristics Methods (MOC).•Study the effect of differents MOC parameters on the results.•Study ...the effect of type and number of angular quadrature sets on the results.•The Monte Carlo code OpenMC was used to verify and validate the results obtained by DRAGON5 code.
This work uses the Characteristics Methods (MOC) implemented in the lattice DRAGON5 code to analyze the 2D C5G7 MOX Benchmark. This method was performed using the MCCGT: module of DRAGON5, this module includes parameters that affect the results. So, a sensitivity study was necessary to find the optimum parameters. The eigenvalues calculated by DRAGON5 code agree well with the reference Monte Carlo code MCNP, and also with the OpenMC code with a percent error of just 0.001% and 0.004% respectively. Compared to the Monte Carlo code OpenMC, the maximum percentage error of assembly power, the maximum and the average percentage error of pin power are 0.07%, 0.85% and 0.13%, respectively.
Based on the accuracy of the results and on the computational cost, the sensitivity study of various MOC parameters reveals that the 2D C5G7 benchmark problem requires: between 16 and 32 for the azimuthal angles, more than 10 cm-1 for the ray density and 8 × 8 for the special mesh.
One‐point correlation analysis on upper‐level meridional wind identified the existence of a teleconnection pattern in July, which emerges from North Africa to East Asia along the westerly jet in the ...middle latitudes. We examined the spatial and temporal structures of this teleconnection pattern, and found the unique characteristics rather different from the patterns in other elements such as geopotential height, streamfunction and vorticity. We also investigated the relationship between this teleconnection and precipitation, and suggested that the teleconnection is a possible linkage of the EASM to the Indian monsoon, and even to subtropical heating anomalies over Atlantic.
Neutrons are produced in accelerators by irradiating heavy targets with an electron or proton beam. Produced neutrons are of high energy. The purpose of our work is optimization the neutron flux by ...MCNP-6 code for production the thermal neutron flux using a moderator and for convertation the fast neutron flux into a thermal neutron flux. In this article, we are interested in a thermal neutron flux due it is useful for method of neutron activation analysis. In conventional sources, the moderator is usually a large volume of water or paraffin around the source. Initially, fast neutrons have energy above 1 MeV, and then slow down to energies below 1 eV.
Due to its complex geometry and neutron spectrum, the GenIV Molten Salt Fast Reactor was largely studied using the “one-step” calculation scheme, based on the Monte Carlo method. However, for ...whole-core simulations, this method requires a long computing time to get accurate results. A deterministic “two-step” calculation scheme must be considered and applied to minimize the computational resources. In general, the first step is to obtain multi-group homogenized and condensed cross-sections, while the second step is using those multi-group cross-sections to perform the whole-core simulations. The treatment of the resonance cross-section behavior is one of the biggest problems that affect the accuracy of the multi-group cross-section and handling such a problem is required before proceeding to the second step calculation. So, it is essential to choose a proper and accurate self-shielding model. In this paper, the different self-shielding models are performed with the deterministic code DRAGON5, using ENDF/B-VIII.0 with various energy group libraries on which the self-shielding model is implemented. The infinite multiplication factor Kinf and the radial distribution of absorption, nu-fission, and capture rates were calculated at the low temperature to demonstrate the rim effect. To guarantee accurate predictions of the results revealed by the self-shielding models, the temperature was increased in the range 893 K–1123 K, and a series of different parameters, such as Kinf, average percent error (AVG), root mean square (RMS), and mean relative error (MRE), were calculated as functions of temperature. The calculation’s accuracy is determined by comparing the results with the stochastic transport code OpenMC. It was found that the deterministic transport code DRAGON5 can accurately treat the effect of self-shielding behavior in the MSFR; hence, DRAGON5 code can be utilized as a tool to generate the multi-group homogenized cross-sections of MSFR for whole-core calculations.
•The feasibility of different self-shielding models for MSFR analysis was assessed.•Both the equivalence in dilution and the subgroup approaches were used.•To treat the rim effect, the spatial distribution of self-shielding was considered.•The effect of increasing the fuel temperature was considered.•The OpenMC Monte Carlo code was used to verify and validate the results.
This paper presents identification of fault location based on coherency of Diesel Generators (DG) rotor angle in distribution system. Coherent behavior of DGs is identified by similar characteristics ...and modelled using network reduction technique and performs stability analysis. Modelling of coherency based network reduction method for transient stability study of distribution system is developed using MiPower simulation package. Performance of proposed method has been tested on a Basaveshwar Engineering College (A), Bagalkot (BEC) 11-Bus distribution system and carried out a fault point/fault area identification. Proposed method is verified for connected load of BEC 11 bus distribution system. Further, analysis has been carried out for hourly load data measured on 6th May 2019, SCADA for Distribution Automation Research Laboratory, BEC. Three phase to ground fault is considered as a disturbance at different buses in BEC 11 Bus distribution system and correlation factors of DGs rotor angle is identified. It is observed from results that, time frame of small signal stability is within 20 seconds and fault location is identified. The outcome/characteristics of proposed method aids for operation and secure maintenance of existing distribution system.
This study aims to investigate the relationship between five factors (employer branding strategy, salary and benefits, training and career development, job flexibility, and supervisor support) and ...employee retention in the semiconductor industry in Penang, Malaysia. Data was gathered using questionnaires distributed via email and social media and was analysed. Based on the responses from 152 employees, the results showed that employer branding strategy and supervisor support contributed significantly to employee retention. The findings highlight the importance of semiconductor companies maintaining a strong employer branding strategy and supervisors providing full support to employees as strategies for employee retention.
Objective Evaluation of Fabric Hand Kim, Jai O.; Slaten, B. Lewis
Textile research journal,
01/1999, Letnik:
69, Številka:
1
Journal Article
Recenzirano
A simple extraction method effectively measures the changes in hand resulting from different fabric types, flame retardant (FR) finishes, and fabric wetness. The effects of FR finishes and wetness on ...the original fabric hand are inconsistent in terms of the direction of increase or decrease depending on the fabric and finish. When FR finished fabrics are wetted, hand forces increase for all fabrics tested. In investigating the re lationships between hand values and selected hand-related physical and surface prop erties, flexural rigidity, drape, and static friction are the major properties that influence hand force measured by the extraction method. This simple method appears to closely approximate the fabric tactile response the human hand feels when touching and grab bing. Hand values objectively measured by this method simultaneously reflect the phys ical and surface properties of the fabric that are important in determining overall hand.
The production of neutrons can be carried out with the bombardment of the nuclei of heavy atoms, with accelerated and energetic particles (generally electrons). The electron collides with the target ...nuclei, so, 20 to 30 neutrons are produced by a process called "spallation". Several countries begin to develop neutron sources especially in the United States, Europe and Japan. The development of new measuring instruments and methods has generally increased the demand for neutron utilization in several areas, such as accelerator proton-based, where protons bombard a heavy metal target. The atoms of the target are excited, resulting in neutron emission.
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