Scattering and Bound State Solutions of the Yukawa Potential within the Dirac Equation

In the presence of spin symmetry case, we obtain bound and scattering states solutions of the Dirac equation for the equal scalar and vector Yukawa potentials for any spin-orbit quantum number κ. The approximate analytical solutions are presented for the bound and scattering states and scattering phase shifts

Evaluation of in vitro antiviral activity of a brown alga (Cystoseira myrica) from the Persian Gulf against herpes simplex virus type 1

The hot water extract of a brown marine alga, Cystoseira myrica, from the Persian Gulf was evaluated as an antiviral compound against KOS strain of HSV-1 in cell culture. The extract exhibited antiviralactivity against herpes simplex virus type 1 (HSV-1) not only during absorption of virus to the cells, but also on post attachment stages of virus replication. The water extract of C. myrica was sterilized byfiltration and autoclaving, respectively. The IC50 for filtered extract was 99 ìg/ml and the IC50 for autoclaved extract was 125 ìg/ml. Based on resulted selectivity index (SI) values of the extracts, whichwere 33.4 and 28.2 for filtered and autoclaved extracts, respectively, we found that the antiviral compound(s) in the water extract of C. myrica to be heat stable. Also, the SI values for inhibition of thepost attachment stages of HSV-1 replication were 23.1 and 21.7 for filtered and autoclaved extracts, respectively. The IC50 in this phase of study were 143 and 162 ìg/ml for filtered and autoclaved extracts,respectively. Therefore, C. myrica could be a good candidate as a natural source for anti-HSV-1 compound(s) isolation

Synthesis of Nano-Structured Polyaniline by Direct Emulsion Polymerization

A direct emulsion process was performed for the synthesis of an emeraldine salt of polyaniline (PANI) us-ing a novel surfactant, namely cetyl dimethyl ammonium phenyl chloride (CDAPhCl). HCl was used as do-pant and potassium persulfate (KPS)was used as an oxidizing agent. Variation of polymer yield was recorded using conventional gravimetric method and resulting polymer salt was analyzed by FTIR. Average particle size and latex morphology was studied using dynamic light scattering (DLS) and scanning electron microsco-py (SEM).Furthermore, the influence of the reaction time followed by polymer yield on the conductivity of re-sulted PANI salt was investigated. SEM images showed a nanostructured polyaniline and conductivity of the polyaninle film found to be 1.65 S cm-1. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3563

Earthquake risk modeling for the evaluation of losses to property owners in the metropolitan area of Shiraz

Natural disasters can cause huge human and economic losses, and subsequent operation efforts in disaster relief, recovery and construction by the government, the private sector stakeholders as well as international donors can significantly drain their resources from other non-disaster related pre-planned investments. As a consequence, there is now a paradigm shift for dealing with extremes from after the event approaches to more pro-active ones, the later one including risk reduction and risk financing options. However, reliable and quantitative up-to-date estimation of the underlying risks is of outmost importance towards developing effective risk management strategies as well as risk reduction activities. This is even more so the case for countries that are highly exposed to natural hazards, such as earthquake risk in Iran. This paper focuses on earthquake risk for Shiraz, the 4th largest city in Iran located in a high seismic active hazard zone with high socio-economic and historical importance for the country. It is for the first time that such an assessment for the region is performed and therefore the results should shed some light on potential risks with a probability based setting which could guide current earthquake related policy processes in the region. A catastrophe modeling approach is adopted to assess risk and a detailed analysis of potential economic losses as well as vulnerability assessments for assets within district 1 is performed. Via combining the hazard, exposure and vulnerability an Exceedance Probability (EP) curve for assets as well as human losses are constructed. The EP curve represents a powerful tool for the assessment of feasible risk reduction strategies as well as cost-benefit analysis for these strategies. An approach is suggested how this could be achieved within an integrative framework

Risk management strategies for managing natural disaster risks: A case study in Shiraz City, Iran

Almost all parts of Iran are seismic hazard prone areas and due to the low quality of constructions as well the increase of exposure in urban areas, recent earthquake events caused unacceptable huge losses, both in human and economic terms. To assess the resilience of various risk bearers, including the government as well as private sector entities, the resources to cope with potential future events as well as possible interdependencies during the occurrence have to be analyzed in detail. Furthermore, to pro-actively act against possible future extremes with risk hedging instruments such as insurance, the underlying risk has to be determined in quantitative manner. This paper suggest how to combine both, the coping dimension as well as the risk dimension, to determine possible risk management strategies which may be feasible in the Iranian context. The focus is specifically on risk instruments, such as insurance, for the Shiraz region in Iran, where the newly produced probabilistic loss estimates are available which are subsequently used to analyze possible insurance schemes and for determining corresponding premium payments as well as affordability. The paper discusses how such risk instruments can be embedded within an integrated framework and which additional options, such as risk reduction or risk pooling, would be beneficial to lower premiums to affordable levels

A Soft Switched DC-DC Boost Converter for Use in Grid Connected Inverters

This paper presents a soft-switching DC-DC boost converter, which can be utilized in renewable energy systems such as photovoltaic array, and wind turbine connections to infinite bus of a big power network, using grid connected inverters. In the proposed topology for the DC-DC boost converter, the main and the auxiliary power switches are turned on and turned off with zero voltage switching (ZVS) and zero current switching (ZCS), respectively. Furthermore, by applying soft-switching techniques to driving power switches, the power losses and stresses associated with commutation of power devices decrease significantly. The efficiency of the proposed soft-switched DC-DC converter at various output powers is compared with that of the traditional DC-DC converter and a few topologies proposed in recent literature. This comparison indicates that the proposed DC-DC boost converter is much more efficient around the rated power (1 kW). The power topology and the control strategy applied to the proposed soft-switched DC-DC boost converter, which is connected to a grid-tied inverter, are analyzed theoretically by simulation studies. Moreover, an experimental prototype is implemented to verify the theoretical analysis and the simulation studies

Comparison of the virulence of some Iranian isolates of Beauveria bassiana to Eurygaster integriceps (Hem.: Scutelleridae) and production of the selected isolate

The virulence of four Iranian isolates and one exotic isolate of Beauveria bassiana on the fifth instar nymphs and also five Iranian isolates and one exotic isolate of it on the adults of Eurygaster integriceps Puton was studied using dipping and topical micro-application techniques, respectively. Nymphs were highly susceptible to the isolates. Comparison of LC50 values showed no significant difference among the isolates to nymphs. In case of the adults, LD50 values of DEBI 002, DEBI 006 and DEBI 008 were comparatively lower than those of other isolates (0.05% Tween 80® solution treatment). Coincidentally, DEBI 002 showed the lowest LD50 value among the others (odorless kerosene treatment). In addition, DEBI 002 showed the lowest LT50 value to adults. In production phase, the effects of different liquid culture media (microbiological glucose, biochemical glucose, chemistry sucrose and sugar) supplemented with yeast extract and solid media (rice, wheat and barley) were studied on blastospore and conidial production, respectively. The highest total yield was obtained 0.801 à 107 blastospores/ml media after 4 days for microbiological glucose plus yeast extract. Maximum conidial production was achieved 1.17 à 109 conidia/gr substrate using rice as medium. Viability of produced conidia on different solid media showed no significant difference among treatments