Deep-sea vessels use various navigational aids like AIS (automatic identification system), ECDIS (electronic chart display and information system), radar, GPS (global positioning system), and etc. vessels use AIS to communicate their navigational characteristics, destinations, and load information. Such data are very helpful for vessel officers; therefore, AIS can be used for communicating the name and position of the vessel as well as navigational signs in the port area. So, this system is very helpful in improving the quality of pilotage as well as improving the safety of navigation in canals like Khur Musa.

Background and Objective: Colon cancer is one of the most prevalent cancers among different societies around the world for which some diagnostic modalities have been developed. With CT colonography there is the possibility of observing extracolonic findings which might have significant clinical importance. Here we evaluated the frequencies of extracolonic findings. Subjects and Methods: This cross sectional study was performed from 2016 to 2019 in Isfahan on 402 patients with colon problems who had CT colonography imaging. Data regarding on extracolonic findings with moderate to significant importance were collected by questionnaire from patients ct reports and analyzed. Results: There were significant relationships between total extracolonic findings and findings with moderate importance like: (Abdominal aortic aneurysm below5, Ovarian lesion possibly just a cyst, Lung nodule. Hydronephrosis likely chronic puj, Mesenteric penniculitis, Pancreas cysts, Psoas asymmetry Small pericardial effusion, Small kidney possible renal artery stenosis, Mild porcelain gallbladder) as well as with age These findings were more frequent at older ages (P <0. 001). Discussion: Generally, these results indicated that CT colonography in patients with colon problems especially patients at older ages might lead to find extracolonic findings with high importance like: ( Possible malignancy e, g lung or solid organ mass lymphadenopathy, Abdominal aortic aneurysm more than 5, Bone fracture, Adrenal hemmorhage, Pneumonia, Considerable hydronephrosis, Bone lesion Appendix mucinous tumour, Diverticulitis with abcess or perfusion, Severe porcelain gall bladder).

A common method for controlling a group of parallel converters in decentralized control strategy structure in an island microgrid, the use is the droop-down characteristics of frequency ω-P and voltage E-Q. However, the problem with using this method is that the reactive power is not properly distributed (in proportion to the capacity of the micronutrients) between the micronutrients, which may lead to overload in the converters. Microgrids may also suffer from dynamic stability problems such as power fluctuations, which can be increased by switching between active and reactive power control. To avoid this problem, the X / R ratio of transmission lines is an important parameter that should be carefully considered in the design of micronutrient controllers. By linearizing and simplifying conditions, the control system conversion function model becomes a single input-single output system, which is efficient enough to show the relationship between control parameters such as slope of droop characteristics and derivative sentences, virtual impedance, and voltage controllers. Using this model, stability conditions for different parameters are analyzed. Also, to improve power distribution stability, common droop strategies are modified by adjusting the slope as well as adding nonlinear sentence sections. This approach reduces the coupling between active and reactive power control and reduces the dependence of power distribution on grid parameters such as the X / R ratio. To evaluate the reliability of the proposed model, the simulation results in a sample island microgrid in MATLAB software are presented.

Given the current situation in the world, affected by COVID‑ 19 pandemic, the only solution for educa-tional program in all countries, especially high-risk ar-eas, is virtual education. . . .

Introduction: Library is one of the essential elements of universities which provide some important educational needs of students. virtual education cannot be exempted and virtual libraries are important support for virtual training programs. The purpose of this study is to evaluate the viewpoint of administrators and students in virtual education centers about the virtual library, its role and resources.Methods: This study was a descriptive survey. The research instrument was a researcher made questionnaire that its validity and reliability was confirmed. The study population consisted of 19 virtual training centers in Tehran city. Out of 19 centers, simple randomized sampling was done in five Centers. The sample size was 360 students. Data collection was conducted online and descriptive statistics using SPSS 18 and Excel software were used.Results: The results showed that viewpoints of administrators and students about the mission and services of virtual libraries in some cases were similar and in some cases were different. One of the administrators’ reasons for setting up a virtual learning system was lifelong learning, and lack of knowledge about virtual libraries was the reason for inadequate use of virtual libraries. The best format of virtual library from the administrators’ and students’ viewpoint, was portal document format (PDF).Conclusion: One of the most important function of a virtual library, is lifelong learning and empowering users to provide information and educational needs. The main reason for not setting up a virtual library is t lack of knowledge about it.

Cerebral Ischemia is a neural disease which causes dying of a number of people every year. The disease usually exposures since stopping the blood pressure and also arresting of heart muscle. HMGB1 is a member of High Mobility Group superfamily proteins which all have a common DNA binding. HMGB1 is released as an extracellular signaling molecule and it binds to Toll like receptors at the cell membrane in the brain cells inflammations. Totally it leads to increase the cytokines and it also intensifies the inflammation. More inflammation can cause the brain cells apoptosis such as neurons and neuroglia cells. Rosamirinic acid, Tanshinone A and Tricin-7 Glucoside which were used for inhibition of HMGB1, they were studied using the Molegro virtual Docker ans LiganScout softwares in this study. According to the scores, results showed that Tricin- 7 Glucoside had better physical and spatial interactions with HMGB1 and TLR2 than others and also Tanshinone A had the best interaction with TLR4.