Sharif Digital Repository

Different types of morphologies and phase structures of crystalline TiO2 were synthesized by hydrothermal methods. For the first time, dandelion-like rutile TiO2 powder composed of numerous single crystalline nanorods was synthesized using TiCl4 as the main precursor. TiO2 Nanoparticles were produced using TTIP and 2-propanol, as precursor and solvent, respectively. Field emission scanning electron microscopy analyses revealed that the synthesized TiO2 nanoparticles had average crystallite size in the range 21–70 nm, whereas dandelion-like TiO2 showed diameter in the range 2-10 µm. According to the significant refractive index of TiO2, in particular rutile phase, it can be used in the... 

Condition monitoring and operation optimization framework of water and energy hybrid systems has been developed in the present research work, by taking into account the variation in behavior of the system over time under changing environmental conditions. System modeling is performed using the physical laws governing the behavior hybrid energy-water system. In addition, machine learning has been used to estimate the deviation of the mathematical model from system operation, which may be due to the effect of depreciation of machinery parts and other uncertain parameters. Using machine learning and mathematical modeling together results in increased accuracy in predicting system behavior over... 

During recent decade huge number of new malware samples and their complexity have caused challenges to malware detection procedure. additionally the use of kernel level rootkit has been grew up. while rootkits usually defeat current security products which are cheifly relied on Operating system for gathering information and also running, existing nti-rootkit solutions can not cover all kinds of rootkits.In this work we have studied the problem of kernel-level rootkits in Windows operating system. we believe that focusing on kernel drivers features, will result in an overall view needs for monitoring kernel activity of the rootkits. Thus with regards to proves for lower volume of obfuscation... 

Butadiene is one of the most widely used materials in the Iran polymer industry. In order to use this material in the first step, the inhibitor must be separated. Consequently, at the start of the project, the separation of Tert butylcatechol inhibitors from butadiene was studied by the adsorption process on active alumina. The results of the condensed butadiene gas chromatography–mass spectrometry test indicate that, by using the active alumina as an adsorbent, the tert butylcatechol will be removed completely. In the next step, 1,3 butadiene, acrylonitrile, acrylic acid acid terpolymer, which one of its applications is manufacturing of artificial teeth, was synthesized by emulsion... 

This thesis presents the results of three tests to evaluate cyclic behavior of special moment resisting frames (SMRFs) with slitted web section. Typically, in SMRFs energy is dissipated by formation of plastic hinges at the beam ends. Nevertheless, based on the codes, the span-to-depth ratio of beams in SMRFs should be larger than a minimum value to assure the development of plastic hinges with sufficient length at beam ends, reducing application of short span beams. Reduced beam section (RBS) was developed to improve the performance of steel moment frame connections by weakening the flanges at a short distance from the columns. In this thesis, an alternative approach is proposed for short... 

In this study, an electroactive membrane with a PES substrate and coating layers of CNT-COOH, FeOCl nanoparticles, and polyaniline (PANI) was designed and synthesized to investigate its performance in the removal of the antibiotic ciprofloxacin and the reduction of the chemical oxygen demand (COD) pollution index from water. To evaluate the membrane’s structure and performance, characterization tests including FTIR, XRD, SEM, EDX-Mapping, contact angle measurement, four-point probe conductivity, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) were employed.The results showed that surface modification significantly improved the physical properties and performance of... 

Noise or noise pollution, is defined as an unwanted sound, produced mostly by motor vehicles in urban areas. If the noise exceeds its limit, adverse effects on users and citizens are expected. Thus the assessment of the noise level and its comparison with allowable values is mandatory. Traffic induced noise depends upon different factors such as traffic, weather, and, sound barriers. Noise pollution study has a long history all over the world. Many studies, mostly representing the outdoor noise pollution models, have been done in recent years. This paper presents an assessment of traffic-induced noise in a heavily traveled tunnel, locally referred to as Resalat tunnel, which is located in... 

Data collected from street networks show that travel time in urban street networks is a stochastic variable, whose range of variation increases with the congestion level. Work and school trips comprise the major part of morning peak volumes, whose common characteristic is that they need to be made on time. For this reason, these travelers are pessimistic in their route choice, and try to choose routes which are more reliable. Travel time standard deviation is one of the common measures for estimating travel time reliability that is related to properties of day-to-day travel time distribution on a particular route. Based on the empirical data collected from Tehran street network, this paper... 

With the advancement of automotive industry, the number of electronic systems that need to communicate with each other has increased. An effective strategy to meet these growing demands is using bus-based protocols, which can establish safe communication among numerous nodes with reasonable cost, weight, and space requirements. The objective of this thesis is the design and implementation of a transceiver based on the FlexRay protocol. The significance of this protocol lies in its ability to provide higher data transmission rates compared to other protocols like CAN and LIN, and its role as the foundational communication medium among various domains in modern vehicle architectures. In this... 

In this thesis, we introduce a novel Artificial Intelligence (AI) system inspired by the philosophical and psychoanalytical concept of imagination as a ``Re-construction of Experiences". Our AI system is equipped with an imagination-inspired module that bridges the gap between textual inputs and other modalities, enriching the derived information based on previously learned experiences. A unique feature of our system is its ability to formulate independent perceptions of inputs. This leads to unique interpretations of a concept that may differ from human interpretations but are equally valid, a phenomenon we term as ``Interpretable Misunderstanding". We employ large-scale models,... 

Quantum entanglement is an essential resource in quantum information processing, such as quantum communication and quantum computing. Although entanglement is critical for practical implementations in these fields, creating and transmitting entanglement without altering the states is challenging. External noise may destroy or weaken the entanglement. Consequently, there is a need for methods to improve entanglement. Entanglement distillation is an effort to address this issue. It is a process where, probabilistically, a smaller number of strongly entangled states are created from a fixed number of noisy entangled states. This process is carried out using only local operations and classical... 

Isopropanol purifying denotes dehydration of it to utilize in industries become important these days. Conventional process like distillation could not produce this product in high purity. Using membrane-based process, pervaporation, to dehydrate Isopropanol and other organic compound has been noticed in the last years. Among all type of membranes to dehydrate alcohols, poly (vinyl alcohol) is more effective due to its high hydrophilic characteristic. But it swallows in aqueous solutions and decrease its selectivity. To enhance structural and separation properties Chitosan, TiO2 and glurataldehyde added to polymeric membranes. Nine membranes have been made in this study that can be grouped in... 

There are different types of sensors for measuring the concentration of gases that usually have high prices because of their complicated method of production. We can produce much cheaper sensors in special conditions by using polymer membranes. Different gases can be separated by using appropriate polymer membranes and the difference between diffusion rate of these gases is the basis of the separation method and gases pass through the membrane with different flow rates in the specific entrance pressure. The flow rate of total gas which flows will be different for a binary gaseous mixture at specific temperature and pressure with different concentrations because the flow rate is relative to... 

composite membranes with PVC as the matrix, Alumina nanoparticles as filler and PVP as additives, were optimized and built. First, the interaction of PVC, PVP and alumina particles on the membrane structure and its performance was investigated by using Design expert software. The membranes which the software proposed were prepared and pure water permeability and flux decline tests were done according to evaluate the membranes performance in membrane bioreactor (MBR). And the results were imported in software and material effects on the performance of each membrane were analyzed. In order to better assess the efficiency and effectiveness of alumina nanoparticles on membrane, different values...