Effects of added artificial substrate on the growth and survival of juvenile Indian white prawn (Penaeus indicus)

The effects of added artificial substrates on juveniles of Indian white prawn (Penaus indicus) were evaluated. Three replicate tanks were randomly assigned to receive added substrate to increase available surface 20, 40, 60 and 80 percent. Control tanks received no added substrate. Juveniles with mean weight of 0.42±0.027gwere raised for 90 days in 5000 lit concrete tanks filled with 4000 lit of water and stocked at a density of 30 ind/m2. Growth and survival of P. indicus juveniles were studied during the culture period. Results showed that substrates significantly (P0.05)

A multi-period location-allocation model for nursing home network planning under uncertainty

This paper proposes a multi-period location- allocation problem arising in nursing home network planning. We present a strategic model in which the improvement of service accessibility through the planning horizon is appropriately addressed. Unlike previous research, the proposed model modifies the allocation pattern to prevent unacceptable deterioration of the accessibility criterion. In addition, the problem is formulated as a covering model in which the capacity of facilities as well as the demand elasticity are considered. The uncertainty in demands within each time period is captured by adopting a distributionally robust approach. The model is then applied to a real case study for nursing home planning network in Shiraz city, Iran

Some recommendations for applying gPC (generalized polynomial chaos) to modeling: An analysis through the Airy random differential equation

In this paper we study the use of the generalized polynomial chaos method to differential equations describing a model that depends on more than one random input. This random input can be in the form of parameters or of initial or boundary conditions. We investigate the effect of the choice of the probability density functions for the inputs on the output stochastic processes. The study is performed on the Airy¿s differential equation. This equation is a good test case since its solutions are highly oscillatory and errors can develop both in the amplitude and the phase. Several different situations are considered and, finally, conclusions are presented.This work has been partially supported by the Spanish M.C.Y.T. and FEDER Grants MTM2009-08587, DPI2010-20891-C02-01 as well as the Universitat Politecnica de Valencia Grants PAID-00-11 (Ref. 2751) and PAID-06-11 (Ref. 2070).Chen Charpentier, BM.; Cortés López, JC.; Romero Bauset, JV.; Roselló Ferragud, MD. (2013). Some recommendations for applying gPC (generalized polynomial chaos) to modeling: An analysis through the Airy random differential equation. Applied Mathematics and Computation. 219(9):4208-4218. https://doi.org/10.1016/j.amc.2012.11.007S42084218219

Effect of spark plasma sintering and high-pressure torsion on the microstructural and mechanical properties of a Cu–SiC composite

This investigation examines the problem of homogenization in metal matrix composites (MMCs) and the methods of increasing their strength using severe plastic deformation (SPD). In this research MMCs of pure copper and silicon carbide were synthesized by spark plasma sintering (SPS) and then further processed via highpressure torsion (HPT). The microstructures in the sintered and in the deformed materials were investigated using Scanning Electron Microscopy (SEM) and Scanning Transmission Electron Microscopy (STEM). The mechanical properties were evaluated in microhardness tests and in tensile testing. The thermal conductivity of the composites was measured with the use of a laser pulse technique. Microstructural analysis revealed that HPT processing leads to an improved densification of the SPS-produced composites with significant grain refinement in the copper matrix and with fragmentation of the SiC particles and their homogeneous distribution in the copper matrix. The HPT processing of Cu and the Cu-SiC samples enhanced their mechanical properties at the expense of limiting their plasticity. Processing by HPT also had a major influence on the thermal conductivity of materials. It is demonstrated that the deformed samples exhibit higher thermal conductivity than the initial coarse-grained samples

Antibacterial activities of the ultrasound assisted extracts of Laurus nobilis, Peganum harmala and rosemary

The present study was aimed to investigate the antibacterial activities of the Laurus nobilis,Peganumharmala and rosemary extracts against Staphylococcus aureus and Escherichia coli. Thus, the ultrasonic extracts were performed using the aqueous, ethanol, hydro-alcoholic or chloroform phases. The microdilution technique was used to evaluate the antibacterial activities which was finally reported as the MIC and MBC values. All the extracts showed the antibacterial activities against the bacteria at the concentration of 6.25%. However, the metalonic extract exert a maximum antibacterial activity. The extract of three plants revealed the same antibacterial activity against E. coli, but the ethanoloic extract from P. harmala showed a maximum antibacterial activity against S. aureus at the concentration of 6.25%. Results of the current study showed the similar antibacterial activities of the extracts against E. coli; meanwhile, the maximum antibacterial effect on S. aureus was observed by applying alcohol or water as a solvent. In general, this paper proposed that ultrasound assisted extraction was quick and cost effective approach to extract the plants. In addition, ethanolic solvent was found as the best selection among the aqueous, hydro-alcoholic or chloroform solvents

Role of manganese in the soldering reaction in magnesium high pressure die casting

The results of dip tests involving the immersion of samples made from H13 tool steel into molten magnesium alloys with different aluminium and manganese contents are presented. The primary aim of the experiments are to understand the role of manganese on the soldering reaction. In addition, results from the high pressure die casting (HPDC) trials are also reported

Determination of energy gain time dependent in D+T mixture with calculating total energy deposited of deuteron beam in hot spot

The fast ignition (FI) mechanism, in which a pellet containing the thermonuclear fuel is first compressed by a nanosecond laser pulse, and then  irradiated by an intense "ignition" beam, initiated by a  high power picosecond laser pulse,  is one of the promising approaches to the realization of the inertial confinement fusion (ICF). If the ignition beam is composed of deuterons, an additional energy is delivered to the target, coming from fusion reactions of the beam-target type, directly initiated by particles from the ignition  beam .In this work, we choose the D+T fuel and  at first step we compute the average reactivity in terms of temperature for first time at second step we use the obtained results of step one and calculate the total deposited energy of deuteron beam inside the target fuel at available physical condition then in  third step we introduced the dynamical balance equation of D+T mixture and solve these nonlinear  differential coupled  equations versus time .In forth step we compute the power density and energy gain under physical optimum conditions and at final step we concluded that  maximum  energy deposited  in the target from D+T and D+D reaction are equal to  to19269.39061 keV and 39198.58043 keV respectively. &nbsp