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Effect of Entrepreneurship Activities on the Well-Being of People; Considering Personal Values as a Mediator
, M.Sc. Thesis Sharif University of Technology ; Tasavori, Misagh (Supervisor)
Abstract
Entrepreneurial activities have always been considered and investigated due to the economic and social effects they have on societies. In research, in addition to the effects of entrepreneurship at the country level, attention has also been paid to its outputs for entrepreneurs. Since people choose this path according to their goals, values , and personal criteria, it is important and necessary to study people and examine the effects of this activity on them. Well-being is one of the concepts that has been considered in this regard. Well-being in general means experiencing positive emotions, avoiding negative ones, and evaluating life positively. Therefore, well-being is one of the things...
Mineral Rights Auction’s Valuation Paradigms: Case Study, The Gulf of Mexico
, M.Sc. Thesis Sharif University of Technology ; Fatemi Ardestani, Farshad (Supervisor)
Abstract
Auction literature and economic theories advocate common valuation among bidders in mineral rights auctions. In this study, we have tried to examine the assumption of common valuation between bidders in a first price sealed bid auction. It examines the common valuation hypothesis by assuming the information symmetry and the exogenous entry of bidders. The findings of this study suggest that bidders’ valuation in a first price sealed bid auction of natural resources may be private or common value. We use the non-parametric estimation model to find that after the federal government imposed Area-wide Leasing in the Gulf of Mexico, bidders’ valuations changed from private valuation to common...
Effects of MR-fluid on low-velocity impact response of MR-laminated beams
, Article 2017 2nd International Conference on Smart Materials Technologies, ICSMT 2017, 19 May 2017 through 21 May 2017 ; Volume 1858 , 2017 ; 0094243X (ISSN); 9780735415324 (ISBN) ; Selk Ghafari, A ; Yadegari, A ; Rashidi, D ; Sharif University of Technology
American Institute of Physics Inc
2017
Abstract
Laminated composite structures are vulnerable to failure when subjected to impact and vibration. The present work investigates the impact response of laminated composite structures filled with MR-fluid segments. The mathematical modelling of a composite plate is presented using finite element method with MATLAB® software to study the vibration response due to impact loads. A proof-of-the-concept experimental work has been set up in order to illustrate the performance and functionality of the MR-fluid on damping vibration for MR-laminated composite structures. © 2017 Author(s)
Improvement of Routing Approaches in Delay-Tolerant Mobile Networks
, M.Sc. Thesis Sharif University of Technology ; Hemmatyar, Ali mohammad Afshin (Supervisor)
Abstract
Delay Tolerant Networks are types of mobile Ad-hoc networks, in where because of the high node mobility, low node density and node diversity, there is not full connection between nodes in the whole network; therefore, the probability of existence of end-to-end path between source and destination is low. Due to these properties, message routing in delay tolerant networks has turned to be a challenge, this type of networks work based on the concept of store, carry, forward; for instance, a node may store a message in the buffer for a long time and carry it along until meeting an appropriate contact opportunity. Delay tolerant networks are capable of providing communication services in...
Intelligent Fault Diagnosis using Multiple Sensor Data Fusion for Detecting Misalignment and Unbalance
, M.Sc. Thesis Sharif University of Technology ; Behzad, Mehdi (Supervisor) ; Arghand, Hesam Al-Din (Co-Supervisor)
Abstract
Intelligent predictive maintenance is recognized as a cornerstone of Industry 4.0, where intelligent software is employed for the early detection of faults and the prevention of unexpected failures. Recent research indicates that the integration of multi-sensor data for fault diagnosis of gearboxes and bearings, using artificial intelligence models, has been successful. However, conventional methods face several challenges. These include an over-reliance on the signal characteristics of a single sensor and the impracticality of applying intelligent learning methods, particularly deep learning, despite their high potential, due to the unavailability of sufficiently large and diverse...
Investigating the Effect of Similarity and Complementarity of Companies’ Knowledge on the Formation of Strategic Alliance: a Case Study of the Biotechnology Industry
, M.Sc. Thesis Sharif University of Technology ; Arasti, Mohammad Reza (Supervisor) ; Farazi, Mohammad Saleh (Supervisor)
Abstract
The aim of this research is to investigate the relationship between "knowledge relatedness" and “strategic alliance formation”. The tendency to cooperate has been increasing among companies in recent decades. Strategic alliances are considered one of the main types of cooperation. In a complex environment (especially in knowledge-based industries), there are few companies that prefer to rely only on their knowledge and technical capabilities to achieve innovation goals. It seems that the degree of relatedness of knowledge base between two firms influences their decision to enter into a strategic alliance. Knowledge relatedness is evaluated through the complementarity or similarity of the...
Bottom-up synthesis of nitrogen and oxygen co-decorated carbon quantum dots with enhanced DNA plasmid expression
, Article Colloids and Surfaces B: Biointerfaces ; Volume 184 , 2019 ; 09277765 (ISSN) ; Khezri, J ; Esfandiari, S ; Mahdavi, H ; Karkhane, A. A ; Rahighi, R ; Heidarimoghadam, R ; Tayebi, L ; Hashemi, E ; Farmany, A ; Sharif University of Technology
Elsevier B.V
2019
Abstract
In this paper, a bottom-up hydrothermal route is reported for the synthesis of oxygen and nitrogen co-decorated carbon quantum dots (CQDs) using ammonium hydrogen citrate (AHC) as a single precursor. DLS data approved the formation of 4.0 nm (average size) CQDs. XRD pattern shows the interlayer spacing (002) of 3.5 Å for CQDs, which is exactly the same as that of crystalline graphite. XPS and FTIR spectra verified the formation of oxygen and nitrogen functional groups on the CQDs surface. Co-decorated carboxyl, hydroxyl and amine groups on the CQDs surfaces make them as promising polyelectrolyte for gene delivery. Toxicity assay showed a survival rate of 70% under different incubation times...