Sharif Digital Repository

Distribution of goods by vehicle routing with split delivery and effective usage of trucks are two important problems which are useful separately and could be applied for different kinds of depots with different trucks to satisfy customers’ demand. Combination of these two NP-hard problems can play a great role to decrease transportation cost. Complexity of this problem is so much that we cannot solve big-size problems by exact methods or branch and bound method in limited time. We introduce metaheuristics methods such as Tabu Search, Simulated Annealing and Ant Colony Optimization which have been presented before, concisely. We present various constraints in routing and distribution,... 

The most important sources in container terminals are berth and quay cranes. The main purpose in the container terminals is reducing delay times of vessels. This will be obtained with planning of terminal sources. This research addresses simultaneous berth and quay crane scheduling problem. A mixed integer linear mathematical model is proposed to minimize sum of completion time of vessels. Since the proposed research problem is NP-hard, two methahuristic algorithms based on Tabu Search (TS) and Particle Swarm Optimization (PSO) are presented to heuristically solve the problem. After parameter tuning, PSO and TS algorithms are compared with experimental design methods. The results indicate... 

In this study, the determination of the distribution and the differences concentration of hydrogen in containment of Bushehr power plant by modeling of containment and Hydrogen removal system of Bushehr power plant during LB-LOCA accident is accomplished. In Bushehr nuclear power plant, which has a unique design, the containment is similar to PWR power plants with a metal sphere, but the installed reactor is a VVER-1000. After a full study on the containment and its systems, the required data for modeling is gathered and afterwards, the engineering handbook is prepared for MELCOR input code and then the modeling and size classification of the containment is done in 4 different ways,... 

Heterocyclic compounds participate in a wide range of reactions, and a large number of them are known. These compounds differ in size and number of rings, type and number of heteroatoms and position of heteroatoms. In the meantime, nitrogen-containing heterocyclic compounds have been widely used in the pharmaceutical and agricultural industries due to their high biological activity. Thioxindole, a cyclic thioamide compound, has been recognized as a biologically active compound and its importance and impact in the development of chemistry are growing. In this thesis, 2-chloroquinoline-3-carbaldehyde is synthesized on acetanilide via Vilsmeier-Haack reaction, a classical reaction in organic... 

In the first part of this thesis provided an efficient and easy method for the synthesis of 3-alkylidin-2-oxindoles containing tetrahydropyrazine structure in the absence of catalysts under green conditions. The oxindole unit represents an important structural motif found in natural products and biologically relevant compounds. On the other hand, pyrazines are important and well-known compounds found in nature and many medicinal compounds. According to the aforementioned, it seems that the oxindole compounds containing the pyrazine rings exhibit high biological activity.In the second chapter of this thesis, an efficient study to synthesize thiopyrano [2,3-b] quinoline containing indole... 

In this study, a 1,2,3-triazole-containing ligand and the subsequent zinc-based MOF were synthesized. Then, in order to investigate the role of structural similarity of analytes and sorbent on sorption efficiency, the sorption capability of triazole-containing MOF along with several other well-known sorbents toward selected triazole fungicides were tested using dispersive micro solid phase extraction (d-μSPE). In order to further investigate the role of structural similarity on the sorption efficiency, the performance of synthesized MOF in the extraction of other compounds such as triazine herbicides, organochlorine, and organophosphorous pesticides was also evaluated. As expected, the... 

In this research, a novel nanofiltration membrane was used to separate nitrate from water as a nitrogen-containing compound. The membrane was fabricated by interfacial polymerization on the modified polysulfone substrate. To improve the efficiency of nitrate removal, several surface and bulk modifiers were used. As modified with LiCl and PVP polymer, the substrate matrix was modified to have the highest porosity to reduce the mass transfer resistance and the much surface area to form a polyamide layer on it. The polyamide layer was then synthesized by interfacial polymerization using a blend of MPD and PIP in different ratios (1: 1 optimum ratio) in reaction with TMC (optimum concentration... 

This study addresses the simultaneous berth and quay crane (QC) scheduling problem in a container terminal. The berths are considered as a continuous area and the vessels arrive dynamically. QCs are allowed to move to other vessels before completing the process on an assigned vessel.The objective function is determined based on the practical applications of the problem. It deals with minimization of sum of the completion time of vessels. In this research, a mathematical model has been developed for the research problem. According to NP-hardness of the research problem, two meta heuristic algorithms based on Tabu Search are proposed. To solve the problem, these methods have two layers with... 

In the first section, a novel and efficient multicomponent reaction for the synthesis of polysubstituted pyrrolidine derivatives is described under catalyst-free conditions using unltrasonic irradiation. The reactions were performed via a one-pot four-component condensation of secondary amines, carbon disulfide, isocyanides, and gem-dicyano olefins at room temperature to afford polysubstituted pyrrolidines diastereoselectively in 56-96% yields. This is the first report of Mumm-type rearrangement with dithiocarbamates followed by intramolecular cyclization which lead to the preparation of the key structure of pyrrolidine.In the second section, an efficient and unprecedented green protocol... 

This study presents a developed successive boundary element method to determine the sloshing natural frequencies, mode shapes and equivalent mechanical models for multi baffled 2D and axisymmetric containers with arbitrary geometries. The developed fluid model is based on the Laplace equation and Green's theorem. The governing equations of fluid dynamic and free surface boundary condition are also applied to proposed model. A zoning method is presented to model arbitrary arrangement of baffles in multi baffled axisymmetric tanks. The influence of each zone on neighboring zones is applied by introducing interface influence matrix which correlates the velocity potential of interfaces to their... 

To obtain solutions containing Titanium, leaching of Ilmenite Concentrate of Kahnooj and its Slag by Sulfuric Acid 98% in various Conditions are Studied. Screening tests by Fractional Factorial method were designed, at this step effects of Temperature, Acid Concentration, Particle Size, Solid to liquid Ratio, Time and Stirring Speed were investigated and It was Concluded that Temperature, Time, Acid Concentration and Particle Size were the effective Parameters in both leaching process of Ilmenite and Slag. The Temperature, Time and Acid concentration had positive effect, whereas the Particle Size had negative effect. After screening step, effective parameters were optimized by Rotatable... 

PE pipes and specially PE100 are commonly used for the transportation of drinking water, transferred water was mostly disinfected by disinfectants such as chlorine, chlorine dioxide and chloramine. Long-term contact with water containing disinfectants led to morphological and mechanical changes and followed by oxidative degradation and failure. Antioxidants are stabilizers which are used in PE pipes to postpone oxidation and increase the durability of these pipes. Migration of antioxidants is possible during the terms of service, in this case antioxidants can be washed by water and left the pipe. As a result, the loss of antioxidants decreases the stability of pipes and leads to oxidative... 

The competitiveness of a port convinced shipping lines and shippers with a significant basis in selecting a port. Port authorities and port operators can make use of the competitive advantage as a parameter for counter measures by grasping the advantages and disadvantages of the ports and be a prime factor of opportunities and threats of the ports. Ports have a significant role in today’s networked business environment. They are being regarded as hubs that are part of various logistic systems. The very essence of a seaport is to link maritime networks and land network. These networks for the port are means of analyzing its competitiveness. A port overall competitiveness is determined by it’s... 

The aim of the present research is to analyse feasibility study of manufacturing the disposable (Biodegradable) plant containers in Iran. The population of the research consists of the whole capacity for manufacturing this product and the similar product producers which have been registered in the Ministry of Industry, Mines and Commerce. First, in this research, the environmental and anti-environmental impacts of non-plant Disposable Containers like: plastic, foam, paper and aluminum have been discussed and also their disadvantages have been examined to be compared with advantages of using plant Disposable Containers. Thereafter, collecting the required data about today society and market,... 

Nowadays, heterocycle compounds containing sulfur have become very important in various industries, especially the pharmaceutical industry; Therefore, these two projects aim to provide better and more efficient ways to synthesize these types of compounds. In the first project, we developed an efficient one-pot, four-component procedure for the synthesis of 2,6-diamino-4-Aryl-4H-Thiopyran-3,5-dicarbonitrile derivatives via a reaction between primary amines, carbon disulfide, malononitrile, and benzylidenemalononitrile in the presence of magnetic NH2.MIL-101(Fe)/ED as a basic metal-organic framework catalyst. Magnetic NH2.MIL-101(Fe)/ED was synthesized through anchoring FeCl3 on CoFe2O4... 

In this study the modeling of Bushehr power plant containment is considered. In Bushehr atomic power plant, which has a unique design, the containment is similar to PWR power plants with a metal sphere, but the installed reactor is a VVER-1000. After a full study on the containment and its systems, the required date for modeling is gathered and afterwards, the engineering handbook is prepared for MELCOR input code and then the modeling and size classification of the containment is done in 4 different ways, including the control volumes of 1, 9, 23 and 30 and then the temperature, pressure and density of hydrogen is examined. The result of studying control volume sensitivity reveals that 23... 

The transportation is one of the important components in the economies of different countries. In the maritime transportation network, the demand is usually not balanced in different routes, and this imbalance results to accumulation of containers in a node. In order to sustain the problem, firms have to reposition empty equipment from a surplus location to a shortage location, which causes the problem of “Empty Repositioning Problem”. In this study, pricing strategies in one transportation market with two locations are considered; while there is ERP problem in issue. The problem is solved by Bertrand game method. The research is divided into two parts of the monopoly network and the duopoly... 

In this study a systematic effort was made to investigate the poisoning effect of sulfur-containing materials on the electro- oxidation of methanol and ethanol on Ni and Cu electrodes in alkaline solutions by the methods of cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy. Activation energy of methanol electro-oxidation in the absence of Na2S was obtained 30.7 kJ/mol by cyclic voltammetric at different temperatures, and its values increased by increase in Na2S concentrations to 97kJ/mol. Na2S adsorption isotherms corresponded with Langmuire isotherm, equilibrium constants of adsorption – desorption and adsorption enthalpy (ΔHads= -62kJ/mol) were calculated for...