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Aims: The environmental crisis in today's world is one of the biggest challenges facing modern man, which requires urgent attention. With the power of wide influence and in-depth analysis, the media can play an important role in raising awareness and shaping the public attitude and behavior about this crisis.. This research aims to represent the relationship between modern humans and the environment in cinema.
Materials & Methods: By reviewing the Iranian films related to the environment, the film “So Far, So Close" was examined as a case study. In this research, Roland Barthes' semiotics method has been used to analyze the complexity and depth of hidden meaning in the film.

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Given the global epidemic of COVID-19, it is important to design a vaccine for prevention. The virus belongs to the beta-coronavirus family and forms appendages on the surface of the glycoprotein spike virus membrane. Studies on SARS-CoV-1 and related MERS-CoV vaccines have shown that the spike protein on the virus surface is a suitable target for the vaccine. In this experimental study, we compare the recombinant fragment of spike protein (rfsp) expressed in the eukaryotic host CHO-K1 cell and prokaryotic  E. coli in terms of immunogenicity, neutralizing activity, and epitopes recognition Similar to the virus strain and the ability to bind to the serum of improved patients, in two types of alpha and delta variants. The results showed that both rfSP proteins are a potential new antigen candidate for the development of the Covid 19 vaccine, but the CHO cell maintains the biological activity of the protein by performing post-translational modification processes such as glycolysis. This increases the present likelihood of developing virus-like epitopes and increases the titer of rfsp-specific antibodies in the serum of immunized mice. Therefore, priority is given to rfsp expressed in CHO cells to evaluate vaccine efficacy.

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The purpose of this paper is to reach the maximum energy recovery or maximum cold stream outlet terminal temperature in a plate fin heat exchanger (PFHE) with constant volume and heat transfer area for a specified maximum pressure drop. This paper presents a methodology in surface selection and design of PFHE where full pressure drop utilization is taken as a design objective in constant heat exchanger volume and heat transfer area. Several kinds of PFHE with different fin type and geometries and different heat exchanger width, length and height could satisfy the constant volume and area condition. Setting maximum pressure drop could reduce these several heat exchangers. While the fin type and dimension of each heat exchanger is extracted due to constant volume-area and pressure drop conditions respectively, the terminal temperature of the heat exchanger would be calculated utilizing thermo-hydraulic modeling of the PFHE. A typical gas turbine regenerator is chosen as case study. The methodology is applied to this case study and results are shown. The surfaces which result maximum energy recovery are specified. In the cases that energy recovery of some surfaces would be approximately the same, other parameters such as frontal area and flow length will be considered

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The modeling and optimization of a rectangular finned multi stream plate-fin heat exchangers is presented in this paper. The proposed method for thermal modeling of this type of heat exchangers is based on uniform heat distribution along the plates. So, the heat streams are distributed along the multi stream heat exchanger based on two principles: equal quantity of stream channel distribution and uniform heat distribution in each of the channels. The geometric, thermal and hydraulic modeling and design of the multi stream heat exchanger is carried out based on rectangular fin specifications. The total annual cost (TAC), the summation of capital investment and operating and maintenance costs are regarded as objective function to be minimized. The main variables are heat exchanger core dimension such as length, width, height and the fin geometric parameters such as fin pitch and height. The genetic algorithm is utilized as optimization tool to minimize the total annual cost of the multi stream plate fin heat exchanger. The proposed method is applied to a case study. The results of the current method is compared with the literatures.

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In contrast with two stream heat exchangers, the three stream ones owns much more complexity in design and rating and a comprehensive rating method has not been proposed, yet. In this paper, a new rating method is presented in order to be used in three stream plate – fin heat exchangers. Rating, in heat exchangers, means finding out the heat load of the heat exchanger or in the other words calculating the outlet temperature of each stream and furthermore, finding out the pressure drops of each stream. In this paper, the differential equations of energy conservation and heat balance of each steam is extracted and a set of differential equations in terms of outlet temperatures in constructed. The general solution of this set of equations is then extracted. In order to expand the general solution to plate – fin heat exchangers, the geometric, thermal and hydraulic modeling are applied based on fin geometric specification which used rectangular type in this paper without losing generality. Based on all of the extracted equation, a comprehensive algorithm of rating of the three stream plate – fin heat exchangers is presented. In order to evaluate the presented algorithm, a case study is used and the results will be shown. Furthermore. A parametric study is applied to the case study to evaluate the effects of the geometric parameters of the fins such as height and frequency on heat load and pressure drop of the heat exchanger.