Sharif Digital Repository

Using mixed building system of structural steel and reinforced concrete improves the resistance of the structure in comparison with using either material alone. Coupled shear walls is one of these new systems. Coupled shear walls by definition is a series of walls coupled by beams as a central core structure with opening to accommodate doors, elevator wells, windows and corridors. Coupled shear walls can provide an efficient structural system to resist horizontal force due to axial and seismic loads. One type of coupled beams is Steel Coupling Beams (SCB) which consists of steel beams and reinforced concrete shear walls which represents a cost and time-effective type of construction. Some... 

Nowadays best using of fossil fuels sources of the country (and) importance of comparison against lack of capacity in petrol production make determined the programmers and the directors to foresee and design expanded programs of the goals, to use natural gas for car fuels. To reach fulfillment of these programs, the confirmed needs of the natural gas cylinders are improved and make it essential to invest on producing compressive natural gas cylinders. In this way economical and technical change researches has been done in order to construct on department to produce 200,000 compressive natural gas cylinders in a year during two sets.(shifts) According to the results of technical researches... 

Different molybdenum oxide nano/micro structure thin films were synthesized by thermal evaporation method under various growth conditions such as deposition time, temperature and evaporation source-substrate distance. Molybdenum oxide nanostructures grown on Si(100) such as nanowalls, nanostars and nanowires were characterized with scanning electron microscopy (SEM), x-ray photoelectron spectroscopy (XPS), x-ray diffraction (XRD), atomic force microscopy (AFM) and high resolution transmission electron microscopy (HRTEM). Shape and type of nanostructures were determined with SEM, AFM and HRTEM analysis. XPS analysis showed that the synthesized nanostructures contained Mo6+, Mo5+, Mo4+ and... 

ZnO is a wide and direct band gap (3.37 eV) semiconducting material with a large exciton binding energy (60 meV). It has been extensively studied in the last few years owing to its potential applications in various fields such as surface acoustic wave devices (SAW), transparent electrode, solar cell windows, photovoltaic devices, gas sensors and photoelectrochemical cells. Recently, much attention has been paid to rare-earth (RE) doped ZnO for possible applications in visible emitting phosphors in displays, high power lasers, and other optoelectronic devices. In this thesis, initially ZnO thin films were deposited on glass and ITO substrates using sol-gel dip-coating method. Optical and... 

It is believed that intramolecular hydrogen bonding and also conjugation can affect the acidity power of organic molecules. But simultaneous effects of intramolecular hydrogen bonding and conjugation have not investigated systematically yet. In this project, we choose Ascorbic acid as a basic structure. Then we have changed its structure conveniently, and have explored the roles of hydrogen bonding and conjugation on the acidity of this molecule by using B3LYP functional with the 6-311++G(d,p) basis set. After that we similarly investigate these effects on the acidity of three different systems, including enols, enamines and alcohols. In this project we probe the effect of different hydrogen... 

Over the Recent Decade, the embedded systems have expanded to include a wide variety of products, ranging from digital cameras, to medical systems, to Radar and telecommunication systems, to sensor networks. Engineers strive to create ever smaller and faster products, many of which, such as battery operated systems, have stringent power requirements. Coupled with increasing pressure to decrease costs and time-to-market, the design constraints of embedded systems pose a serious challenge to embedded systems designers. Dynamic reconfigurable hardware can provide a flexible and efficient platform for satisfying the area, performance, cost, and power requirements of many embedded systems.... 

An interesting theoretical and practical set of problems in computer science is concerned with the study of spatial relations among objects in a geometric space. Examples of such problems for a set of points P are finding the closest pair of the points P, partitioning space into regions such that all points of a region have minimum distance to the same point in P, and computing the Euclidean minimum spanning tree on P. Moreover, we need mechanisms to efficiently update these properties when the points P are allowed to move or may be inserted or deleted. This is to avoid re-computation of these properties from scratch. Here, we consider the Euclidean minimum spanning tree (EMST) of a set of... 

The purpose of this study was to find out the effective factors on customer satisfaction and its consequences in Kish Island (IRAN).In this research the researcher had used two different kind of sample the first sample is customers of three different hotels of 3 star, 4 star, 5 star and The second sample are managers of these hotels. The sample size was 285 of hotel customers and 11 of hotel managers. The first purpose of this study was to identify the drivers and results of customer satisfaction and also identifying there relationship with customer satisfaction. The second goal of this study was to propose a customer satisfaction model for hotel industry in kish island (IRAN). In this... 

Synthesis, characterization and photocatalytic applications of core-shell like ZnO@CdS nanorods have been studied in this research. The synthesis of core-shell like ZnO@CdS nanorods was carried out in three different steps. At first, ZnO seed layer was formed on glass substrate via sol-gel process under optimum conditions using absolute ethanol solution containing zinc acetate and a stabilizer ( either Monoethanolamine (MEA) or diethanolamine (DEA)). When MEA used as stabilizer, the optimum concentration of sol was found 0.2 M, while increasing the sol concentration caused the seed layer to be grown in a string-like structure. The RMS surface roughness of seed layer prepared by 0.2 M sol... 

Shear wall has been widely used in RC structures due to high initial stiffness and lateral load capacity. Hence, the behavior and effectiveness of retrofitting technique on shear wall are needed to be investigated widely. Among several available techniques for retrofitting RC structures, fiber reinforced polymer (FRP) is quite effective because of its high strength-weight ratio, high resistance to corrosion and easy handling and installation. Several researchers have investigated on the behavior of retrofitted RC members with FRP jackets like columns. However, application of FRP laminates on RC walls has attracted less attention by researchers. In this study a numerical investigation on... 

Dealing with uncertainty in demand, Seasonal product retailers have to make two important decisions. The first one is pricing of the products during their selling season and the second issue is the inventory level and also reordering decisions during the aforementioned period. It is worth mentioning that all products are using a shared capacity which left us barehanded with the pricing and optimizing inventory levels independently. In this thesis, a new model for retailers is presented which includes demand learning and determines optimal prices and inventory policies for multiproduct industries  

Many embedded processors are used in harsh environments and their behavior should be investigated against the incidence of common faults. Fault Injection is a prevalent method to do this investigation. Simulation-based fault injection is one of the most prominent forms of fault injection. A fault model is required to do simulation-based fault injection. Simulated faults should have the most similarity to the real faults. Temperature variation and in the extreme case thermal shock is one of the probable faults in harsh environment. In this thesis, we want to propose fault models for thermal shock in various abstraction levels, evaluate and compare these fault models and present methods to use... 

Liquid storage tanks as part of the lifeline facilities play an important role in the rescuer work and drinking water supply after earthquakes. Importance of these structures demonstrates the need for investigating their dynamic behavior under dynamic loading. To assure the safety of liquid storage tanks, the dynamic response of liquid storage tanks has been studied intensively in the past. Housner proposed a widely used analytical model in which the hydrodynamic pressures are separated into impulsive and convective components. This model is mostly used for the horizontal groud motion. In this study, considering soil-structure interaction (SSI), nonlinear dynamic behavior of concrete... 

The main scope of this article is to identify Floer homology invariantsby means of Heegaard splitting of a 3-dimensional orientable manifoldY . Here by ” Heegaard splitting ” for Y , we mean decomposition Y =U ? U , where U and U are two balls with orientable g?handles,? ? ? ? ?gwich attached together on a closed oriented surface ? of boundary.gOne can identify this splitting by specifying two sets of oriented closedcurves ? = (? , ? , · · · , ? ) and ? = (? , ? , · · · , ? ) which live on ? .1 2 g 1 2 g gDesired invariants will be obtained by investigating g?order symmetricproducts of ? , denoted by SPg(? ) . in factT = ? × · · · × ? andg g ? 1 gT = ? × · · · × ? will play the role of... 

It has been passed more than half a century from the application of value methodology (including value analysis, value engineering, value management and value planning) to improve the project value and so far, thousands of value studies (VSs) have been performed all over the world. Because of the nature of this method, in all of data value studies, new approaches and valuable knowledge – which is called “study outcomes (OS)” in this study – are produced by specialists. However, nearly all of the new VSs as well as planning, designing or performing of new project is performed regardless of previous VS repeatable outcomes whereas presence of some previous VS members can be useful to enhance... 

Wall-Frame interaction under lateral load has been considered in studies, and it is concluded that interaction lateral forces of rigid frame and shear wall varies at different stories. This is resulted from of different mode shape of rigid frame and shear wall under lateral loads which are shear and bending mode, respectively. However most codes recommend a minimum strength for frame, equal to 25% of total lateral force, as an acceptance criterion of shear wall-frame dual action; otherwise this minimum strength does not fully comply with horizontal distribution of lateral load according to relative stiffness of components.The purpose of this article is to study nonlinear seismic response of... 

Due to the growth of population and the increasing number of auto-manufacturing plants in the world, governments have to find ways to decrease traffic, environmental pollution, etc. Providing parking lots is another problem with which we have to deal. It seems that designing and building multi-storey reinforced concrete parking structures is one of the ways to resolve this problem. According to complex behavior of concrete in compression and tension, it was so important to use an appropriate behavior model. In this research damage concept is used instead of crack concept which could models concrete behavior appropriately which causes acceptable results. According to uni-axial, bi-axial and... 

In this thesis, we consider various Make-to-Order systems as a version of integrated production-inventory systems. Most Make-to-order systems can be sufficiently modeled by a queueing system with inventory in which completing each service in the queueing system requires an on-hand inventory. Unlike most researches in this field, we present an analytical approach. In all systems we embed a stochastic process with joint state space that can entirely describe the state of system. Then steady state distributions are derived. Those distributions are applied to compute performance measures and long-run average cost function which can be used for optimization. In our Make-to-Order models, demands... 

Planar visibility computing is defined as determining the region of the plane that is visible from a specific observer. This concept has many applications in computer graphics, robotic and computer games. In this thesis we consider two visibility problems: the visibility testing problem which checks the inter-visibility of two objects and the visibility counting problem which counts the number of visible objects from an observer. For these problems we propose new algorithms which have some improvements compare to the previous ones  

Memory organization plays an important role in embedded systems. Among the various component, memories as principle of consumption large amount of energy, are more important in power consumption, real time feature and fault tolerant of system.so that depend on system application, various configuration of memory organization are used…………. Memory organization issues include memory size, memory management methods, hardware management unit, cache, SPM and theirs subject and so on. This thesis discussed important topics related to energy consumption, real time and fault tolerant feature in memory organization and purposed a Configurable Description of Memory Organization for Low-Energy and...