In this paper, a fuzzy method called C-Means is used for division of a power system into different region. The extension of disturbance between these regions can be avoided by using a FACTS-embedded local controller in each region. Optimal location of FACTS devices (STATCOM) are determined by designing a voltage control method and using an optimization algorithm. This control method is a decentralized approach that prevents unallowable deviation of voltage during disturbances. To verify the performance of the proposed method, 118-bus IEEE power system is used. The simulation results show the desirable performance of the proposed method.

The main goal of this paper is to analytically analyze of the effect of the electric vehicle aggregators on the statistical behaviors of Locational Marginal Prices (LMPs) of busses, considering network congestion. In order to achieve this aim, at the first step, by extending the LMP decomposition into 6 sections in Lemma1, the sensitivities of LMPs to the power generation of aggregators in each bus are analyzed analytically. With the help of the coefficients of LMP decomposition, it can be possible to rank the busses to the presence of electric vehicle aggregators, based on the impact on the random behavior of electricity prices. It must be noted that this ranking does not same with the cap of electric vehicle aggregators. Finally, in order to confirm the analytical results, at second step,  the random behaviors of power generations of aggregators in each bus are simulated in the IEEE-24-bus system, and the STandard Deviations (STD) of LMPs are calculated for all basses. The correlation of STD with LMP decomposition coefficients indicates the accuracy of LMP decomposition in the prediction of the effect of the presence of electric vehicle aggregators on the random behavior of LMP.

Bus voltage stability is very important factor in power system reliability.Voltage instability and protection system malfunction can lead to voltage collapse. If power systems cannot meet reactive power demands on a bus, voltage starts to drop. Thus, reactive power compensation can reduce the risk of voltage collapse. In this paper, two new indices are introduced for weak bus identification; also, a method is proposed for reducing the collapse probability of placing capacitors. To this end, the networks of 30 IEEE standard buses were studied; buses were ranked according to the weakest bus identification indices. Network probabilities of being in normal, under-voltage, and risk-and-collapse zones were calculated. By the strategic placement of capacitors with PSO (Particle swarm optimization), the algorithm probability of networks in the collapse zone reduced significantly; also, the performance of proposed indices over other methods was illustrated.

Nowadays microinverter with power levels ranging from 150 to 300 W, has become the trend for some grid-connected PV systems specially for residential PV systems. Also, in marine industries, photovoltaic microinverters can be used to produce a part of the electrical energy required on ships. In single phase microinverters there is a double-frequency ripple on the DC bus voltage that causes harmonics and reduces power factor. In order to reduce this ripple, large electrolytic capacitors are often used at the DC bus that the drawback is short lifetime of these capacitors. To overcome this problem, it is necessary to replace electrolytic capacitors with thin film capacitors that have long life and low capacitance. By decreasing the capacitance the amplitude of double frequency ripple on the bus voltage increases so the common bus voltage controller (PI) can’t solve the tradeoff between the output current THD and bus voltage fluctuations (overshoot and undershoot). In this paper, by using the proposed control methods a microinverter is designed and simulated so that this tradeoff has been solved without using additional hardware. This microinverter is connected to the grid (220V, 50Hz). It has a very small 20µF bus capacitor. The bus voltage has negligible overshoot and undershoot in response to a 200W input power step. THD of the injected current to the grid is 0.44% at 250W output power. The effectiveness of the proposed method is validated by simulation results in Matlab-Simulink software.

In recent years, electrical networks have been subjected to harmonic pollution due to the expansion of nonlinear loads such as power electronic devices, electric arc furnaces and etc. In this paper, a new method is presented for identifying and determining the harmonic contribution of each feeder connected to a bus in the radial networks. In these networks, using this method, in the buses that has been subjected to the voltage harmonic distortion, it is possible; firstly, the responsible feeder to voltage harmonic could be identified from all feeders connected to the desired bus. Secondly, the harmonic contribution of each feeder could be quantified. In this method, the harmonic contribution of each feeder connected to a bus is separately determined in a voltage harmonic distortion for each harmonic order; in addition, the harmonic contribution of each feeder on total harmonic distortion of the bus is also determined. This method is based on the comparison of each feeder with the ideal feeder corresponding to them. Also, in this paper, a new method for harmonic modeling of each feeder connected to a bus (from a radial network) is also presented, which is based on linear regression between voltage and current samples and minimization of the sum of least mean squares (LMS) errors.

Streptococcus iniae is a gram-positive bacterium that causes invasive infections with severe septicemia and meningitis as well as high economic losses in freshwater and sea fish. It is one of the most infectious diseases in Asian sea bass. The purpose of the present study was to investigate the role of this bacterium in marine bass fish mortality in farmed cages on the northern coast of the Persian Gulf.  In this study, a number of 150 cultured Asian sea bass (60 fish suspected of bacterial infection and 90 apparently healthy fish) were selected and bacterial sampling were taken from head kidneys and brain of fish from sea bass cages of Bushehr, Khuzestan and Hormozgan provinces. After isolation and purification of the bacteria, the presence of Streptococcus iniae was evaluated and confirmed via biochemical tests and molecular methods (with specific primers of lctO gene). The PCR results and sequencing of the PCR product indicate high prevalence of Streptococcus iniae in Asian sea bass cages culturing in the Persian Gulf. Therefore, effective measures should be taken to prevent Streptococcosis (especially vaccination).

A large number of hadiths in Shia narrative texts contain the word "Nafi-e- ba~s". In jurisprudence and principles courses, Imami jurists have provided explanations regarding the meaning of this phrase; But there is no independent research about discovering the semantic truth of this phraze. Identifying the concept of "Nafi"(negation) and the scope of its implications play a significant role in explaining the contents of these narrations and choosing the correct ruling in the inference position. By looking at the literal meaning of "Ba~s", the Qur'anic usage of this word and the statements of Imami jurists about it, it is concluded that the meaning of "negation of B~as" is  the exclusion of Tahrimi  prohibition and punishment  in the area where they are suspected to exist.

The main goal of this paper is to structural and mathematical analysis of the network losses in different load levels. In order to achieve this aim, at the first step, the market is dispatched and the structural generation decomposition is proposed in lemma 1. This analytical decomposition reveals the sensitivity factor of marginal unit's generation to each bus load variation. At second step, in Lemma 2, the analytical relationship between the change of lines flow and load changes has been obtained. Finally the Loss Index for each bus, LIn and the network LIsys analytically is defined, using lemmas 1&2. LIn analytically indicates the variation of network losses by variation of load at bus n. It is expected that the LIn be the positive value. But, according to the market problem, load and generation disperse and congestion LIn may be the negative value, unexpectedly. In this paper, in view point of the losses, the critical load point of each bus and the network is defined as the bus load or the network load value that change the sign of the LIn and LIsys, respectively. Moreover, the critical area of the load in viewpoint of the losses is defined as the load area that leads the maximum network losses. These results can be useful to decision making on the location options of the DSM programs. Finally the three IEEE standard networks are analyzed.

In recent years, as most farms in the shrimp industry in Khuzestan have become semi-active or inactive due to the spread of white spot viral disease. Therefore, the Asian Seabass, due to its characteristics, has the ability to breed in such farms as an alternative. Also, the salinity of the water caused by the recent droughts is a threat to the province's freshwater pools. For this purpose, in June 1398, three pools were selected from the earthen pools of Choebodeh Shrimp Farms in Abadan and three pools from Khorramshahr freshwater pools. After transportation, prepared and adapted to the temperature, 10/000 Asian baby Seabass fishes weighing 45 grams, were stored in shrimp pools with an area of 7000 square meters. 1/000 Asian baby Seabass fishes were also stored in two-hectare freshwater pools with four species of farmed carp. Feeding is done according to standard tables of Seabass fish in salt water, but in freshwater pools with carp, no separate food was considered and the same diet of carp fish was sufficient. Physico-chemical factors of water including temperature, pH and oxygen continuously and biometric factors such as nutritional indicators and growth factors including specific growth factor (SGR), food conversion factor (FCR), weight gain, (WG), protein efficiency ( PER) and growth retardation percentage (SVR) were checked once every 3 weeks. After 170 days of breeding, the weight of fishes in saltwater pools reached an average of 760 grams and in freshwater reached an average of 710 grams. In the event that shrimp production is difficult, Asian Seabass can be used as a successful pattern in species diversity as an alternative crop. Also, when the price of carp is reduced or in cases of drought salinity, the joint cultivation of Asian Seabass with carp is recommended.

Vibrio harveyi is of the bacterial flora of omnivorous fish intestine that is considered as one of the main causes of the Asian seabass (Barramundi) fish vibriosis disease in many cage farms in the world. The purpose of this study was to investigate the role of this bacterium in the mortality of Asian seabass fish in southern regions of the Iran.  In this study, in 11 cases of Asian seabass mortality, a total of 110 Asian seabass fish (80 suspected vibriosis fishes and 30 healthy fish species) from southern provinces (Khuzestan, Bushehr and Hormozgan) were sampled and bacterial culture from the internal organs was done. Biochemical and molecular characteristics (with specific primers of genus and species) of isolates were investigated. Nine (81.81%) cases of vibrios (Vibriosp). Were diagnosed as causative of mortality.  The results showed that in fish with symptoms of vibriosis, 70.76% of the isolates were V. harveyi. Also, in the seasonal study, the prevalence of V.harveyi, the losses due to vibriosis and the highest prevalence of infection with this bacterium were observed in spring. The antimicrobial susceptibility test of 46 isolates of V. harveyi isolates was also investigated. The results of this study indicate the significant role of Vibrio harveyi in the mortality caused by vibriosis in Asian seabass fish farms in Iran. The results are important for prevention perspective (health management and vaccination) and the effective treatment of Vibriosis disease in Asian seabass fish, these results are important.