Methane production from anaerobic co-digestion of poultry manure

, Article Journal of Environmental Studies ; Volume 38, Issue 62 , Sep , 2012 , Pages 83-88 ; 10258620 (ISSN) Roshani, A ; Shayegan, J ; Babaee, A ; Sharif University of Technology

2012

Abstract

According to the results, anaerobic co-digester appeared to be feasible with the loading rate of 3.0 kg VS/ m 3.d at 34°C and biogas production rate of 44.8 1/d, which can be used as a fuel resource. It should be mentioned that more heat input is required to achieve the correct operational temperature. This increase in energy may not be outweighed by the increase in the outputs of biogas from the system. Therefore, it is important to consider an energy balance for these systems

Bed mixing and leachate recycling strategies to overcome pressure drop buildup in the biofiltration of hydrogen sulfide

, Article Bioresource Technology ; Volume 109 , 2012 , Pages 26-30 ; 09608524 (ISSN) Roshani, B ; Torkian, A ; Aslani, H ; Dehghanzadeh, R ; Sharif University of Technology

2012

Abstract

The effects of leachate recycling and bed mixing on the removal rate of H 2S from waste gas stream were investigated. The experimental setup consisted of an epoxy-coated three-section biofilter with an ID of 8cm and effective bed height of 120cm. Bed material consisted of municipal solid waste compost and PVC bits with an overall porosity of 54% and dry bulk density of 0.456gcm -3. Leachate recycling had a positive effect of increasing elimination capacity (EC) up to 21gSm -3 bedh -1 at recycling rates of 75mld -1, but in the bed mixing period EC declined to 8g Sm -3bedh -1. Pressure drop had a range of zero to 18mm H 2Om -1 in the course of leachate recycling. Accumulation of sulfur reduced...

Design and Synthesis of a Drug Delivery System Based on Mesoporous Bioactive Glass

, M.Sc. Thesis Sharif University of Technology Mirsafaie, Sahar Sadat (Author) ; Abdekhodaie, Mohammad Jafar (Supervisor)

Abstract

The aim of this research is to develop a smart mesoporous bioactive glass-based carrier for targeted drug delivery to cancer cells, particularly bone cancer cells. To achieve this, mesoporous bioactive glass nanoparticles were first synthesized, followed by surface modification with amine groups. To prevent premature drug release before reaching the target tissue and to introduce pH sensitivity, the nanoparticle pores were coated with oxidized hyaluronic acid via Schiff-base bonding with the amine groups on the surface. The use of hyaluronic acid facilitates active targeting of CD44 receptors, which are overexpressed on the surface of cancer cells compared to healthy cells. This process...

Electrodeposition of Pt nanostructures and its Application as Glucose Sensor

, Ph.D. Dissertation Sharif University of Technology Mahshid, Sahar Sadat (Author) ; Dolati, Abolghasem (Supervisor) ; Ghorbani, Mohammad (Supervisor)

Abstract

The present work describes sensing application of modified Pt nanostructures towards detection of glucose. Modified Pt nanostructured electrodes were prepared using electrodeposition method such as chronoampermetry and potentiostatic pulse methods. The electrodeposition of Pt nanostructures was first studied by voltammetry and amperommetry techniques and then potentiostatic pulse method has been used to produce the alloyed structures of platinum. In this regard, the first electrode was proposed based on alloyed Pt/Ni nanowire arrays (NWAs) for the non-enzymatic detection of glucose. The Pt/Ni NWAs were prepared by pulse electrodeposition of Pt and Ni within a nano-pore polycarbonate (PC)...

Quantum Estimation of Open Systems Using Extended Cramer-Rao Bounds

, M.Sc. Thesis Sharif University of Technology Mehboudi, Mohammad (Author) ; Rezakhani, Ali (Supervisor) ; Alipour, Sahar (Co-Advisor)

Abstract

Any physical system is characterized with some set of quantities or parameters, knowing which, is equivalent to estimation of the system. Evaluating such parameters is usually done using tomography methods. An important question to ask, is how to increase the precision of measurement, being able to do some specific set of physical operations, say, measurement?
this question is more important in parameter estimation in quantum meanical systems. It has been shown that, quantum meanics causes a fundamental limit, on precision of estimating su parameters, escribed by the so called “antum Cramér-Rao bound”.We must note that almost all quantum meanical systems are interacting with the...

Behaviour of End-Plate Connections in 3D Frames Under Fire Conditions: Experimental Study

, Article International Journal of Steel Structures ; Volume 18, Issue 3 , 2018 , Pages 734-749 ; 15982351 (ISSN) Khonsari, S.V ; Vosough Grayli, P ; Ghorbani, A ; Roshani Moghaddam, A ; Sharif University of Technology

Korean Society of Steel Construction 2018

Abstract

Due to high vulnerability of steel structures to elevated temperatures and the need for taking adequate and effective measures to reduce human and financial losses in fires, a thorough understanding of such behaviour is of utmost importance. In this research, a half-scale 3D model, comprising moment-resisting frames, equipped with flush end-plate connections, in one direction, and braced frames in the other, was subjected to a scaled ISO 834 standard fire. The maximum attained temperature was 1055 °C. The results showed that the structure tolerates high temperatures for an appreciable amount of time before collapsing. Moreover, for thick flush end-plates, which were used in this study, the...

Investigating Merger and Acquisition Deal Process: A Case Study Research from an Emerging Market

, M.Sc. Thesis Sharif University of Technology Roshani, Sahar (Author) ; Talebian, Masoud (Supervisor) ; Abdoh Tabrizi, Hossein (Supervisor)

Abstract

Earlier research mainly have addressed to a part of the M&A phenomenon and rarely have conducted multi-aspect analysis of it. On the other hand, unfortunately a high percentage of M&A deals collapses before completion which implicates there is not a thorough understanding of all the variables involved in the M&A process. Therefore, we conducted a case study research which is better qualified at providing in-depth, multi-aspects and multidisciplinary understanding and therefore novel findings of this multifaceted and complex phenomenon, M&A, in an emerging market context. Our research aims to highlight these questions: 1. what are the underlying incentives behind M&A deals initiation? 2. What...

Selective Transfection of Smart Polymeric Nanoparticles Into Reactive Astrocytes in Animal Model of Spinal Cord Injury

, Ph.D. Dissertation Sharif University of Technology Sabourian, Parinaz (Author) ; Frounchi, Masoud (Supervisor) ; Mashayekhan, Shohreh (Co-Supervisor) ; Kiani, Sahar (Co-Supervisor)

Abstract

In this study, chitosan-based nanoparticles were prepared due to their biocompatibility, availability, high loading capacity of drug, stimulus responsive behavior and the presence of active functional groups. Chitosan was chemically functionalized with reactive oxygen species (ROS)-responsive moiety to respond to the oxidative stess and endosomal pH in nerve injuries. To prepare nanoparticles, functinalized chitosan ionically gelated with pH-responsive polyanions with ROS-scavenging properties such as polyacrylic acid and hyaluronic acid. Then, pH- and ROS-responsive nanoparticles were used for selective transfection into reactive astrocytes and axonal regeneration in spinal cord injuries....

QCM Investigation of Different Depositing Factors Effects on the Asphaltene Deposition

, M.Sc. Thesis Sharif University of Technology Roshani, Mohammad Mahdi (Author) ; Ghazanfari, Mohammad Hossein (Supervisor) ; Taghikhani, Vahid (Supervisor)

Abstract

Asphaltene deposition, the heaviest and most polar component of crude oil, which causes great economic damage inside the reservoir, near wells, pipelines and well equipment, is an important challenge in the production of oil reservoirs. The main purpose of this study is to prob the adsorption kinetics and the mechanism of asphaltene adsorption on the metal surface by a quartz crystal microbalance device under different conditions of temperature, flow rate and degree of asphaltene instability. In this study, indirect uv-vis spectroscopic method was used to determine the onset of asphaltene precipitation, then experiments were designed using Taguchi method. A new QCM device has been designed...

Applications of the quartz crystal microbalance in energy and environmental sciences: From flow assurance to nanotechnology

, Article Fuel ; Volume 313 , 2022 ; 00162361 (ISSN) Roshani, M. M ; Rostaminikoo, E ; Joonaki, E ; Mirzaalian Dastjerdi, A ; Najafi, B ; Taghikhani, V ; Hassanpouryouzband, A ; Sharif University of Technology

Elsevier Ltd 2022

Abstract

In the last decade, there has been a swift development in several scientific research works in which the quartz crystal microbalance (QCM) technique has played a critical role in unravelling different aspects of energy and environmental materials and biological substances as well as all corresponding molecular interactions within those media. We comprehensively review the numerous types of surface chemistries, including but not limited to hydrogen bonding, hydrophobic and electrostatic interactions, self-assembled monolayers and ionic bonding, that are monitored using QCMs in a variety of fields such as energy and chemical industries in addition to the biology, medicine and nanotechnology...

Nanogold imprinted starch bionanocomposites for food packaging applications

, Article Starch Based Nanomaterials for Food Packaging: Perspectives and Future Prospectus ; 2023 , Pages 209-226 ; 978-044318967-8 (ISBN); 978-044318968-5 (ISBN) Tariq, T ; Saleem, I. M ; Sahar, A ; Raza, N ; Sameen, A ; Nayik, G. A ; Ramniwas, S ; Sharif University of Technology

Elsevier 2023

Abstract

Food science researchers are concerned about global food wastage due to decreased shelf life. It has been shown that using approaches based on nanotechnology, including metal-based nanoparticles (NPs), can alleviate the issues with decreased shelf life and environmental problems. Gold nanoparticles (AuNPs) and their synthesis have seen notable advancements in the last several decades. AuNPs are now utilised more often in industrial and medicinal settings. AuNPs are being employed in the nanopackaging industry as a recently adopted technique because of their medicinal and antibacterial properties and their inert and hypoallergenic nature. When employed in the food industry, AuNPs have...