h. moghadam

Solar panels are always installed at an angle in which receive the maximum amount of energy. Small and even 1-degree changes in the angle of the installed panel have a significant impact on the annual energy received. The objective of this study was to study the evaluation of change in the sun's radiant energy on the surface perpendicular to the radiation during the day. Calculations of changes in the intensity of radiation on the surface of the panel are generally performed by assuming that the intensity of solar radiation is constant on the surface perpendicular to the radiation during the day (choosing the solar constant) and multiplying it by the cosine of the azimuth angle (which varies during the day). Since the sun's rays travel different lengths in the atmosphere at different times of the day, the intensity of the sun's radiation on the surface perpendicular to the radiation varies throughout the day. In this study, the effect of daily changes in the intensity of solar radiation on the surface perpendicular to the radiation, on the optimal angle of the solar panel has been investigated. The results showed that the daily optimal angle difference reported in this study compared to previous studies is more than 5 degrees in some cases. Also, installing the panel under the optimal daily angle (for day number 100) and the correct yearly angle resulted in receiving 128.56 kilowatts per square meter and 2.977 megawatts per square meter more energy, respectively. According to the results of this research, the annual optimal angle for a geographic latitude of 30 degrees, taking into account the changes in solar radiation energy on the surface perpendicular to the radiation, is 26 degrees, which is 4 degrees different from the geographic latitude. Also, the results show that if the panel is installed at an angle of 30 degrees, the energy received annually is 16.122 megawatts per square meter less than if the panel is installed at an angle of 26 degrees.

In this study, molecular docking, quantum mechanics and molecular dynamics methods were used to investigate protein-ligand interactions of the epidermal growth factor receptor 2 (HER2 ). The virtual screening was performed by docking among 2000 chemicals derived from the ZINC library to find specific inhibitors. Trastuzumab is the active site in the HER2 extracellular domain and the target area. The scoring function was used to calculate the binding affinity of the found inhibitors to the active site of the HER2. Among the found inhibitors, six ligands were chosen based on suitable electronic structure and energy. The H-bond interaction energies between six ligands and HER2 were investigated and bond critical points were determined for each bond path between the two corresponding atoms by the quantum theory of atoms in molecules. Root mean square deviation, root mean square fluctuation, the radius of gyration and binding free energy were calculated to check and evaluate the stability and mobility of the simulated system using molecular dynamics simulation.

Cannabis (Cannabis sativa L.), commonly known as hemp, is an annual herb belongs to the family Cannabacea. The seeds of this plant have considerable content of oil and unsaturated fatty acids, and its fiber is used in the paper and textile industries. Tetrahydrocannabinol and cannabidiol are main cannabinoid compounds of this plant, which have high importance for their well-known pharmaceutical properties. Therapeutic effects of secondary metabolites of hemp on different diseases, such as cancer, Multiple Sclerosis (M.S.), and AIDS and their anxiety and palliative characteristics have been reported in several studies. Considering oil content, and therapeutic and industrial properties of the hemp as well as, its high diversity in Iran, more studies are needed to better recognize this plant and the economic production of its therapeutic compounds. In the present paper, a comprehensive review of agronomic, therapeutic and phytochemical characteristics of hemp is presented.

Electro-spraying is a process in which the electric field is applied as an external force to the surface of a liquid capillary to control the size and size distribution of produced droplets. Electric filed exert an external force on the surface of a conductive liquid at nozzle tip in addition of gravitational force. These forces overcome surface tension and leading to elongation of meniscus and consequently separation of droplets. Smaller droplets could be overcoming on surface tension force using a higher electric force. On the other hand, it is possible to produce droplets with desire size and uniform size distribution by changing the external applied electric force. Electro-spraying is one of the known process which able to spraying the liquids into the very small droplets in range of micrometer and nanometer. The aim of this paper is the reviewing of droplets production in electro-spraying method and investigation on the effect of different parameters on the modes of this process.

A Field experiment was conducted to determine the effect of five plant densities (10, 15, 20, 25 and 30 plants m-2) on yield and yield components of three sorghum cultivars (Local, Payman and Kimyia) in Sistan region in South East of Iran, using a split design based on randomized complete block design. The results showed that the plant density had a significant effect on number of seeds per panicle, 1000 kw, grain yield and grain yield per plant. The highest grain yield (3830 kg ha-1) was obtained from the density of 30 plants m-2. Grain yield per plant, number of seeds per panicle and 1000 kw were significantly decreased by increase in plant density. Local cultivar produced the highest number of panicles and number of seeds per panicle than other cultivars. The interaction effects of treatments on measured traits were not significant. According to the obtained results, density of 30 plants m-2 are more appreperiate and recommendable for the region.