فصلنامه علوم و فناوری دریا
سال بیست و سوم شماره 90 (تابستان 1398)

Nowadays, the new generation's guided weapons and their control systems play a very important role on the battlefield. Information excellence is one of the most important parameters in controlling and directing new-generation weapons. The core of the information system is based on the capabilities of sensors, command, control and weapons systems. Achieving this goal is an impressive dominance in military operations by creating a central network of state parameters. The purpose of this research is to attack the structure of the network at designated points in order to disrupt its weapon control system using a scenario-based approach. For this purpose, firstly, descriptors and effective variables were extracted using various and up-to-date sources. The panel of experts was formed and the cross-sectional matrix of descriptors was rated. The mean scores were applied to the scenario wizard software and a portfolio of scenarios was extracted. Finally, two optimistic scenarios and two pessimistic scenarios were extracted as a product.

One of the ways to gain competitive advantage is to focus on the supply chain and improving it. The suppliers are an important component of the supply chain, which is why the quality of the final product depends heavily on the raw material of the product and the supplier's performance. In addition, with increasing global awareness regarding the issue of sustainability and governmental orientation, companies can not ignore sustainability issues in business, therefore organisations gradually begin to attract the concept of sustainability in their companies, in order to guarantee competitive advantage. In fact, organizations add all aspects of sustainability involving economic, environment and society, to their entire business processes in order to maximize the value of their business. The appropriate operation of the suppliers will ensure the continuity of the supply chain. Considering the importance of sustainability and choice of suppliers in recent years, as well as the dependence of the sustainability and survival of today's advanced societies on the chemical industry, selecting appropriate criteria of supplier with a sustainability is set as the goal of this study.Firstly, the criteria related to the studied industry have been identified by Delphi Fuzzy questionnaire, then the Weight of each criterion calculated using the Grey DEMATEL technique.

With regard to environmental goals, the use of renewable energy in energy production is increasing. Given the geographic location of each region, choosing the right method for producing renewable energy leads to increase efficiency and economic benefit. In this paper, the feasibility and capacity of the coast and port of Noshahr in order to achieve optimal renewable energy production method is carried out. In this study, according to various references, the situation in the country of Iran and the coast and the port of Noshahr, in terms of the amount of solar radiation, wind speed and capacity, geothermal energy capacity, biomass and various types of marine energy production, including wave, tidal, ocean thermal, ocean current, and salinity gradient energy have been studied and evaluated. Each of these methods is also compared in terms of cost. According to feasibility studies and evaluations, Noshahr port is a suitable place for energy production by ocean thermal, because at a low depth of water it is possible to reach a difference of at least 20 degrees between the surface water and the deep water. Also, this method, according to an economic survey, has the lowest cost among the methods available in the port of Noshahr.

Arvand River is the result of the combination of three rivers: Karun (from Iran), Tigris and Euphrates (from Iraq). In this research, the location of the plume of Arvand River has been identified by using temperature, salinity and density data of the ROPME (Regional Organization for the Protection of the Marine Environment) expedition during March, 1992, in the north of Persian Gulf region with Python programing along the vertical line. ETOPO2 was used in the Python environment to create topography of the region. Results clearly illustrate that the plume of Arand River in terms of temperature is near the coast of Saudi Arabia (150 km on bottom and 212 km on the surface), and, in terms of its salinity characteristic, the effects of Arand River are sharply limited to the coast of Kuwait (37 km), which is related to the more rapid mixing of temperatures compared with salinity.

Coastal cliff retreat is a serious problem threating such shorelines worldwide, and may be defined as the change in position of the shoreline. Retreat effects on natural coast demolition is required the recognition of the retreat mechanism and it’s influenced factors. In many cases, undercutting of the cliff toe by wave action and subsequent mass failure, is the mechanism by which most cliffs are eroded. This paper has reviewed retreat of coastal cliffs and some models to estimate it. The main cause of retreat is wave run up; as a result physical components such as width of beach, slope angle of the cliff, existence of berms, indentations and outcroppings can be effective on retreat. But then again lithology is a key constituent of rate of recession. To achieve accurate results, cliff retreat models must be attained due to dissipation of wave energy, debris accumulation and discharge at the cliff toe, with exact studies of coast dynamic behavior and wave energy in it’s significant period, based on geotechnical, probabilistic, statistical, mathematical scientific principles and hybrid models.

Abstract Bioengineering is a new therapeutic approach for patients with tissue or organ damage. In this method, tissue or organ function is returned or retained. The first effective factor in tissue repair is the construction of scaffold for cell attachment, proliferation, and differentiation. Marine environments are a huge source of bioactive compounds and substances that are used in medicine. Marine polysaccharides such as agarose, alginate, carrageenans, Fucoidan, chitin and chitosan, glycosaminoglycans, and marine proteins and ceramics have unique properties that make them suitable for tissue regeneration. Marine compounds and scaffolds made from them in bone tissue engineering , cartilage, neural tissue and wound healing have satisfactory results and improved tissue function in vivo and in vitro conditions.