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Study of the Optical Properties and Structural Fluxionallity of a New Cu(I) Complex Containing Bis(diphenylphosphino)methane and Phthalazine
, M.Sc. Thesis Sharif University of Technology ; Jamali, Sirous (Supervisor)
Abstract
In the current study, the dinuclear copper(I) complex ,[Cu2(μ-phthalazine)(phthalazine)2(μ-dppm)2](PF6)2,(1), has been prepared by the reaction of two equiv of [Cu(CH3CN)4]PF6, three aquiv of phthalazine, and two equiv of bis(diphenylphosphino)methane (dppm). However a mixture of two four coordinated copper(I) complex,1, and a three and four-coordinated copper(I) complex ,[Cu2(μ-phthalazine)(phthalazine)(μ-dppm)2](PF6)2,(2), have been prepared when the reaction has been carried out with equal ratio of the reactants. The structure of 1 and 2 determined using. X-ray crystallography in solid state and the structure of 1, further characterized by multinuclear NMR spectroscopy in solution....
Design and fabrication of an ubiquitous, low-cost, and wearable respiratory bio-sensor using ionic soft materials
, Article 26th National and 4th International Iranian Conference on Biomedical Engineering, ICBME 2019, 27 November 2019 through 28 November 2019 ; 2019 , Pages 55-59 ; 9781728156637 (ISBN) ; Mirzaei, I ; Esmaeili Dokht, P ; Fardmanesh, M
Institute of Electrical and Electronics Engineers Inc
2019
Abstract
The respiratory system is a vital organ system which makes breathing and gas exchange possible for human's body. The loss of functionality in this system is due to either genetical problems or environmental issues like pollution or toxic gases which in many cases is inevitable. These circumstances may cause different respiratory diseases which may not be curable presently but their side effects can be partly controlled by careful and timely analysis improving the quality of patient's life. So, an appropriate device for conducting different analysis can be effective for people who suffer from respiratory diseases such as chronic obstructive pulmonary disease (COPD), asthma, occupational lung...
Design and Fabrication of Impedance Flowcytometric based Microfluidic Sorter
, M.Sc. Thesis Sharif University of Technology ; Fardmanesh, Mehdi (Supervisor)
Abstract
Microfluidic technology is a field of science that deals with the design, fabrication, and experimental tests of small-scale fluid systems and has made great strides over the past decade. As an interdisciplinary field, this growing field of technology has many applications in medicine, diagnostics, chemical analysis, electronics industry, etc. One of the primary applications of the microfluidic devices is the development of " laboratory on-chip (LOC)" tools as point-of-care (POC) diagnostic tools, such as, rapid detection during surgery. A LOC device includes various application modules, sample transfer and preparation modules, separation modules, and detection and analysis modules. The...
Optimal Design of Cascade Stilling Basins using Metaheuristic Algorithms
, M.Sc. Thesis Sharif University of Technology ; Sheikholeslami, Razi (Supervisor)
Abstract
The country's increasing demand for water makes effective dam management essential. Beyond environmental concerns, constructing new dams and their components involves relatively high costs. One of the most critical components of a dam is its spillway, which accounts for a significant portion of the total construction costs and plays a vital role in water resource management. To reduce spillway construction costs, a specific type of spillway that combines a stepped spillway with cascading basins can be employed. Designing this type of spillway can be considered as an optimization problem, requiring the use of optimization methods. Metaheuristic algorithms, which have gained significant...
A novel, low cost, and accessible method for rapid fabrication of the modifiable microfluidic devices
, Article Scientific Reports ; Volume 10, Issue 1 , 2020 ; Esmaeili Dokht, P ; Fardmanesh, M ; Sharif University of Technology
Nature Research
2020
Abstract
As microfluidic chips are evolving to become a significant analysis tool toward POCT devices, it is crucial to make the cost and the time required for the fabrication process of these chips as low as possible. Because of the multidisciplinary nature of these systems and the collaboration of many different laboratories and organizations from vastly various fields with unequal types of equipment, it is essential to develop new techniques and materials to make the integration of disparate systems together more straightforward, accessible, and economical. In this paper, we present ethylene–vinyl acetate (EVA) as a new polymer-based material for the fabrication of different microfluidic chips,...
Analysis of generalized optical orthogonal codes in optical wireless local area networks
, Article IEEE Journal on Selected Areas in Communications ; Volume 27, Issue 9, Article number 5342317 , December , 2009 , Pages 1572-1581 ; Pakravan, M. R. (Mohammad Reza) ; Sharif University of Technology
2009
Abstract
In this paper we propose and analyze the application of generalized optical orthogonal codes (GOOC) in the optical wireless local area networks (OWLAN). A system deploying GOOC can support more users and achieve better BER performance. We evaluate the system performance of GOOC noting practical constraints of OWLAN applications. We consider average and peak power limitations of free space infrared sources, arising from eye safety and device non-linearity restriction. We include the impact of various noises including background-light induced noise in system evaluation. Proper system design requires appropriate selection of GOOC code parameters. We analyze the influence of code parameters on...
Global Estimates of Manure and Synthetic Fertilizer Phosphorus Loss in Runoff and the Quantification of Data Uncertainities
, M.Sc. Thesis Sharif University of Technology ; Sheikholeslami, Razi (Supervisor)
Abstract
The increasing rate of population and agricultural development over the past few decades has led to a significant rise in the pollution of surface and groundwater. The application of animal and synthetic fertilizers containing phosphorus, which increases the levels of this element in the soil, can be considered one of the factors endangering the environment, especially the quality of surface waters. The transport of phosphorus, which is one of the pollutants in agricultural runoff, can lead to the degradation of aquatic ecosystems and reduce the quality and usability of water resources. Accordingly, various numerical models have been developed to simulate phosphorus loss from the soil. They...
Homogeneous Einstein Spaces with Negative Scalar
, M.Sc. Thesis Sharif University of Technology ; Fannaei, Hammid Reza (Supervisor)
Abstract
All known examples of homogeneous Einstein spaces with negative scalar curvature (non compact) are isometric to standard Einstein solvmanifolds . we prove that any nilpotent Lie algebra having a codimension-one abelian ideal is the nilradical of a rank –one Einstein solvmanifold . In other words this nilpotent Lie algebra admits a rank-one solvable extension which can be endowed with an Einstein left invariant Riemannian metric . also a curve of pairwise non-isometric 8-dimensional rank-one Einstein solvmanifold is given .
Design and Development of an Alternative System of Recycling Exhaust Gas of a Direct Iron Reduction Furnace based on the Criterion of Minimum Destruction of Exergy and Water Usage
, M.Sc. Thesis Sharif University of Technology ; Sobouhi, Yadollah (Supervisor) ; Ashjari, Mohammad Ali (Co-Advisor)
Abstract
Enormous amounts of water and energy are lost by scrubber utilization for furnace exhaust gas washing during direct iron reduction process. Hence, the aim of the current research is design and construction of a system which could be employed instead of scrubber within direct iron reduction process considering the equipment size constraints.To this end, the substitute system was manufactured after dimensional analysis and simulation of lab model compared to the prototype regarding the implementation limitations. The model has been tested in different operating conditions and empirical relations have been extracted for general analysis of direct iron reduction process. The case study here is...
Analysis of power control for indoor optical wireless CDMA networks using OOK and BPPM
, Article IET Communications ; Volume 4, Issue 16 , November , 2010 , Pages 1919-1933 ; Pakravan, M. R. (Mohammad Reza) ; Gohari, A ; Sharif University of Technology
2010
Abstract
Wireless infrared optical code-division multiple access (W-OCDMA) is a new developing technique with many useful applications. Noting the limitation on power consumption and eye-safety requirements, wireless optical systems are power limited. Therefore control and efficient use of optical power is a key issue in analysis and design of these systems. Also, multi-user interference is the major source of impairment in these systems and power control is required to control and reduce this interference. Power control and the inevitable errors in its algorithms play an important role in design and implementation of these systems. In this article the authors study the uplink performance of W-OCDMA...
NAFAS: non-rigid air flow active sensor, a cost-effective, wearable, and ubiquitous respiratory bio-sensor
, Article IEEE Sensors Journal ; Volume 21, Issue 7 , 2021 , Pages 9530-9537 ; 1530437X (ISSN) ; Esmaeili Dokht, P ; Khazaee Nejad, S ; Fardmanesh, M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2021
Abstract
A Non-rigid Air Flow Active Sensor (NAFAS) to detect the respiratory patterns is introduced in this paper. The main part of NAFAS is an ionic electroactive polymer-based ( ${i}$ -EAP) soft sensor. It can accurately detect breathing patterns and has promising features to develop low cost, wearable, and ubiquitous spirometers. Patients with respiratory diseases need to take pulmonary function tests consistently. Hence, it is time-consuming and expensive. To address these problems, NAFAS presents point-of-care testing (POCT) of the respiratory system's function. The proposed ${i}$ -EAP based sensor is a small strip of Ionic Polymer Metal Composite (IPMC) that has been fabricated using a Nafion...
Stabilization of robots with actuator constraints via interconnection and damping assignment
, Article IEEE Transactions on Control Systems Technology ; Volume 31, Issue 6 , 2023 , Pages 2945-2952 ; 10636536 (ISSN) ; Namvar, M ; Dokht Taghirad, H. R ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2023
Abstract
Actuator limitations hinder high-performance control of robotic manipulators. The problem is particularly challenging in case of underactuated robots where the issue has received less attention. In this brief, we investigate stabilization of manipulators under input constraints via total energy shaping. For this purpose, we use interconnection and damping assignment passivity-based control (IDA-PBC) together with an optimization technique to keep actuator torque close to allowable limits. Using a subsequent technique, the actuator torques are ensured to stay within the specified bounds for special classes of manipulators. The results are verified through simulations on a 2 degree-of-freedom...
Performance analysis of slotted ALOHA random access Packet-Switching optical CDMA networks using generalized optical orthogonal codes and M-ary overlapping PPM signaling
, Article Journal of Optical Communications and Networking ; Volume 3, Issue 7, Article number 5910463 , July , 2011 , Pages 568-576 ; Khazrae, S. (Simin) ; Pakravan, M. R. (Mohammad Reza) ; Sharif University of Technology
2011
Abstract
In this paper we study slotted ALOHA random access optical code division multiple access packet-switching networks with a chip-level receiver structure. We use generalized optical orthogonal codes (GOOCs) and the overlapping pulse position modulation (OPPM) signaling technique to improve system performance. The impact of physical layer parameters such as the GOOC cross-correlation value and the OPPM overlapping index on key performance benchmarks such as network throughput and delay are analyzed. We also study the stability of the network based on the number of backlogged users, using the expected state drift. It has been shown that using GOOC instead of strict optical orthogonal codes...
Optimized design of water-saving system in-slab cooling plant of Mobarakeh steel complex
, Article Journal of Cleaner Production ; Volume 335 , 2022 ; 09596526 (ISSN) ; Bazofti, M. M ; Golkar, B ; Saboohi, Y ; Mokhtari, H ; Milani, B ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
The aim of this paper is to provide a solution to decrease water consumption in the slab-cooling unit of Mobarakeh Steel Complex in Iran. The plan should give an hourly decline in water consumption during a one-year operation period to calculate the annual reduction in water consumption of the proposed process. Recommended solutions for the conversion scheme of an existing wet cooling tower to a dry or hybrid cooling system require modeling of the slab cooling process. The curves of temperature drop in slabs are extracted in this paper by modeling the transient heat transfer of the slabs in the cooling process. This will reduce the computational volume. Then, the design and optimization of...
Multiphysics analysis and practical implementation of a soft μ-actuator- based microfluidic micromixer
, Article Journal of Microelectromechanical Systems ; Volume 29, Issue 2 , 2020 , Pages 268-276 ; Azizmohseni, S ; Esmaeili Dokht, P ; Bagheri, N ; Aghassizadeh, A ; Fardmanesh, M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2020
Abstract
Electroactive-Polymers (EAPs) are one of the best soft $mu $ -actuators with great biomedical applications. Ionic ones (i-EAPs) have more promising features and have adequate potential for using in the active microfluidic devices. Here, as a case study, we have designed and fabricated a microfluidic micromixer using an i-EAP named Ionic Polymer-Metal Composite (IPMC). In microfluidics, active devices have more functionality but due to their required facilities are less effective for Point of Care Tests (POCTs). In the direction of solving this paradox, we should use some active components that they need minimum facilities. IPMC can be one of these components, hence by integrating the IPMC...
Shape Optimization of Wind Turbine Jacket
, M.Sc. Thesis Sharif University of Technology ; Tabeshpour, Mohammad Reza (Supervisor) ; Mehdigholi, Hamid (Co-Supervisor)
Abstract
Due to the higher wind speed in the seas and the lack of barriers in front of the turbine, and the lack of residents next to them, the noise of the turbine makes them uncomfortable, and the lack of a limit to the turbine's dimensions, has made the offshore wind turbines receive a lot of attention. And the jacket platform also costs much less to build and maintain than floating platforms. Given that these structures are built on the codes of oil rigs, most of them are designed overdesigned, so it is essential to optimize these rigs so that they are less costly and less material is used to build them. In this thesis, we considered shape optimization by considering a real jacket wind turbine...
Water-energy nexus approach for optimal design of hybrid cooling system in direct reduction of iron plant
, Article Journal of Cleaner Production ; Volume 287 , 2021 ; 09596526 (ISSN) ; Morad Bazofti, M ; Akbari Mohammadi, A ; Mokhtari, H ; Saboohi, Y ; Golkar, B ; Ghandi, A. H ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
Direct reduction of iron process in steel industry has special production conditions. Low quality cooling water, low cold and high hot cooling water temperature, space limitation for new equipment installation, high value-added of product and severe effect of cooling water temperature on production rate are of these conditions. Considering technical and economic constraints and limitations, this situation makes this process an attractive case study for converting the existing wet cooling tower to hybrid cooling system. In this paper, based on integration of process, dry and wet cooling system and ambient conditions profiles, a new method for designing hybrid cooling system has been proposed....
A new 3D, microfluidic-oriented, multi-functional, and highly stretchable soft wearable sensor
, Article Scientific Reports ; Volume 12, Issue 1 , 2022 ; 20452322 (ISSN) ; Esmaeili Dokht, P ; Olyanasab, A ; Orouji, N ; Alipour, Z ; Sayad, M. H ; Rajabi, K ; Mazzolai, B ; Fardmanesh, M ; Sharif University of Technology
Nature Research
2022
Abstract
Increasing demand for wearable devices has resulted in the development of soft sensors; however, an excellent soft sensor for measuring stretch, twist, and pressure simultaneously has not been proposed yet. This paper presents a novel, fully 3D, microfluidic-oriented, gel-based, and highly stretchable resistive soft sensor. The proposed sensor is multi-functional and could be used to measure stretch, twist, and pressure, which is the potential of using a fully 3D structure in the sensor. Unlike previous methods, in which almost all of them used EGaIn as the conductive material, in this case, we used a low-cost, safe (biocompatible), and ubiquitous conductive gel instead. To show the...