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    Colorimetric fingerprints of gold nanorods for discriminating catecholamine neurotransmitters in urine samples

    , Article Scientific Reports ; Volume 7, Issue 1 , 2017 ; 20452322 (ISSN) Jafarinejad, S ; Ghazi Khansari, M ; Ghasemi, F ; Sasanpour, P ; Hormozi Nezhad, MR ; Sharif University of Technology
    Catecholamine neurotransmitters, generally including dopamine (DA), epinephrine (EP) and norepinephrine (NE) are known as substantial indicators of various neurological diseases. Simultaneous detection of these compounds and their metabolites is highly recommended in early clinical diagnosis. To this aim, in the present contribution, a high performance colorimetric sensor array has been proposed for the detection and discrimination of catecholamines based on their reducing ability to deposit silver on the surface of gold nanorods (AuNRs). The amassed silver nanoshell led to a blue shift in the longitudinal localized surface plasmon resonance (LSPR) peak of AuNRs, creating a unique pattern... 

    Examining the level and strength of technology in the industries of the country iran by using escap model and introducing solutions for developing technology

    , Article Australian Journal of Basic and Applied Sciences ; Volume 4, Issue 10 , October , 2010 , Pages 4638-4649 ; 19918178 (ISSN) Rahmani, K ; Behravesh, M ; Behravesh, M ; Karegar, N ; Fereidooni, A ; Sharif University of Technology
    The economic growth or asset of country basically depends on the amount of goods which can be produced by the combination of land, capital, manpower and natural resources. Therefore, changing natural resources into production is the new process of economical development, and technology is the brain of this type of transformational activities. This tool not only makes the changing operation possible but also, in the world economy makes the survival and growth foundation of business enterprises. The Development of today's technology has caused some change in the productivity and costs, and because of this, the global and national structure in the areas of production, business and employment... 

    Spanning trees in random satisfiability problems

    , Article Journal of Physics A: Mathematical and General ; Volume 39, Issue 18 , 2006 , Pages 4901-4909 ; 03054470 (ISSN) Ramezanpour, A ; Moghimi Araghi, S ; Sharif University of Technology
    Working with tree graphs is always easier than with loopy ones and spanning trees are the closest tree-like structures to a given graph. We find a correspondence between the solutions of random K-satisfiability problem and those of spanning trees in the associated factor graph. We introduce a modified survey propagation algorithm which returns null edges of the factor graph and helps us to find satisfiable spanning trees. This allows us to study organization of satisfiable spanning trees in the space spanned by spanning trees. © 2006 IOP Publishing Ltd  

    Seismic analysis of Tehran Telecommunication Tower using complex fractional modulus

    , Article Structural Design of Tall Buildings ; Volume 11, Issue 5 , 2002 , Pages 353-373 ; 10628002 (ISSN) Horr, A. M ; Safi, M ; Asadpour, N ; Sharif University of Technology
    Seismic response of large concrete tower structures with passive or active damping is important in terms of performance under earthquake loads. The conventional finite element method has been used successfully in linear and nonlinear analyses in large concrete structures. The method can be performed by subdividing the large structure into small uniform elements having approximate shape functions. Although this replaces a single complicated structural system with a number of simple uniform elements, in cases of tall concrete tower structures with cracking and crushing behaviour in the concrete material and yielding in the reinforcement, the computer time and memory can be large. Hence, it is... 

    Toward green revolution in concrete industry: The role of nanotechnology (A review)

    , Article Australian Journal of Basic and Applied Sciences ; Volume 5, Issue 12 , 2011 , Pages 2768-2782 ; 19918178 (ISSN) Hosseini, P ; Mohamad, M. I ; Nekooie, M. A ; Taherkhani, R ; Booshehrian, A ; Sharif University of Technology
    Nowadays, the development of nanotechnology is faster than before due to its interdisciplinary nature. Other branches of engineering have started employing this technology in the process of their development; one example would be concrete science and technology. Nearly a decade has passed since the first application of nano-particles in a matrix of concrete products. During this time period, two directions have formed in the process of researchers' investigations. The first route is the precise monitoring of the microstructure and macrostructure of concrete products with the help of nanotechnology tools and methods. The second route is the development of concrete products with... 

    A novel multi-sender algorithm based on multi-cast concept for P2P networks

    , Article 2006 International Symposium on Communications and Information Technologies, ISCIT, Bangkok, 18 October 2006 through 20 October 2006 ; 2006 , Pages 143-147 Firooz, M. H ; Ronasi, K ; Pakravan, M. R ; Avanaki, A. N ; Sharif University of Technology
    Unlike those on Internet, the media providers on P2P networks are ordinary nodes whose contribution bandwidth is limited. Multi-sender methods are the best solutions known to video streaming on P2P networks. In this paper, we propose use of a multi-cast method on the top of an arbitrary multi-sender method so that all requesting peers receive almost the same expected bit-rate. That is while the existing multi-sender methods maximize the bit-rate delivered to the first receiver and cannot provide acceptable bit-rates to the next requesting nodes. © 2006 IEEE  

    Near field differential interference contrast microscopy

    , Article Scientific Reports ; Volume 10, Issue 1 , 15 June , 2020 Heydarian, H ; Yazdanfar, P ; Zarif, A ; Rashidian, B ; Sharif University of Technology
    Nature Research  2020
    Near field scanning optical microscopy exploiting differential interference contrast enhancement is demonstrated. Beam splitting in the near field region is implemented using a dual color probe based on plasmonic color sorter idea. This provides the ability to illuminate two neighboring points on the sample simultaneously. It is shown that by modulating the two wavelengths employed in exciting such a probe, phase difference information can be retrieved through measuring the near field photoinduced force at the difference of the two modulation frequencies. This difference in frequency is engineered to correspond to the first resonant frequency of the cantilever, resulting in improved SNR, and... 

    Adaptive control of structures by LMS algorithm: A comparative study

    , Article Proceedings of the Institution of Civil Engineers: Structures and Buildings ; Volume 152, Issue 2 , 2002 , Pages 175-191 ; 09650911 (ISSN) Golafshani, A. A ; Mirdamadi, H. R ; Sharif University of Technology
    ICE Publishing Ltd  2002
    By using the normalised least mean squared (NLMS) algorithm, a semi-active multi-variable adaptive controller is designed for a seismically excited structure. There is no need for a large power supply. A number of valves and battery size low-power supplies will suffice. The valves control the amount of flow of a fluid through bypass on-off orifice channels in installed energy dissipating mechanisms. Each mechanism is composed of a piston attached to a A-shaped chevron wind-bracing on each floor and to a cylinder attached to the upper floor. Adaptive controller parameters are estimated by the LMS optimiser, in order to search for optimal non-classical damping coefficients of the dissipating... 

    Elaborating Religious Guidelines for Technological Development

    , Ph.D. Dissertation Sharif University of Technology Ravanbakhsh, Rostam (Author) ; Taqavi, Mostafa (Supervisor)
    Some philosophers and thinkers have made serious criticisms of modern technology, considering it the cause of major problems. These critiques and problems have motivated some philosophers to think of alternatives for technology. Andrew Feenberg, one of the scholars seeking alternatives for technology, argues that the modern technical system is derived from the values of capitalism and serves a select few. As a diagnosis, Feenberg considers the capitalistic values to be the root of modern technological crises and as a prescription, he recommends a “democratic technological design system”. Feenberg has proposed no criteria for evaluating the values that could be incorporated into the... 

    Technological learning in large firms: mechanism and processes

    , Article Interactive Learning Environments ; 2021 ; 10494820 (ISSN) Ghazinoory, S ; Mohajeri, A ; Kiamehr, M ; Danaeefard, H ; Sharif University of Technology
    Routledge  2021
    The prerequisite of developing countries’ economic growth is to move along the technological development trajectory through technological learning, and large firms as hubs of technological knowledge, play an important role in this transition. In this paper, we tried to bridge two main taxonomies in the field of technological development, one of them referring to taxonomies of firms, and the other one referring to technological learning processes. We have identified technological learning processes in several post catch-up large firms through content analysis and then by employing a survey approach, we explore technological learning processes of Iranian large firms. The results indicate that... 

    Cultural conflict in technology transfer to non-industrial communities: A critique of ihde's ideas

    , Article IEEE Technology and Society Magazine ; Volume 39, Issue 4 , 2020 , Pages 71-81 Monadi Nouri, S ; Taqavi, M ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2020
    Societies today have come closer together as a result of the development of communication technologies and the greater ease with which business is transacted. Consequently, technological tools and devices are being transferred from industrial societies to other countries at dazzling speeds the transfer of technology to non-industrialized societies with their own histories, civilizations, and backgrounds has led to the emergence of cultural issues and conflicts that are specific to the modern period and that had not existed prior to this period. In this article, we have reviewed the ideas of Don Ihde, a leading contemporary philosopher who has done much work in the field of the philosophy of... 

    Technology planning system for the Iranian petroleum industry: lessons learned from sanctions

    , Article Technological Forecasting and Social Change ; Volume 122 , 2017 , Pages 170-178 ; 00401625 (ISSN) Hoshdar, F ; Ghazinoory, S ; Arasti, M ; Fassihi, S. F ; Sharif University of Technology
    Iran's petroleum industry is facing challenges including maturity of hydrocarbon fields, growing population of the nation that demands additional revenues from petroleum exports, and international economic sanctions that have limited access to technology sources. Restrictions from international technology providers have led managers of the industry enterprises to try to develop their needed technologies inside the country. The Ministry of Petroleum has supervised this and as a result, a technology planning systems has been developed and implemented since 2009. In this paper, an overview of the Iranian petroleum industry is provided from a technology planning perspective. The focus has been... 

    Applying of Hax Model in Development of Sectoral Technology Strategy
    Iran Fuel Cell Technology Strategy Case Study

    , M.Sc. Thesis Sharif University of Technology Bagheri Moghaddam, Nasser (Author) ; Arasti, Mohammad Reza (Supervisor)
    This thesis is a part of national studies of “attractiveness analysis and strategy formulation of fuel cell technology in Iran" that was done during more than two years with the guidance of fuel cell steering committee. In this thesis, first of all the possibility of applying the technology strategy model of Arnold Hax in national level was investigated. For this purpose, with regard to the fuel cell technology specifications and status in the country, from the perspectives of national need to the technology, capabilities of technology in the country and new applications of technology, the technology strategy models of positioning school were studied and from the models of this approach,... 

    Explore Reasons for Rejection of Agricultural Technologies in Underdeveloped Areas with Water Scarcity Problem

    , M.Sc. Thesis Sharif University of Technology Choobchian, Pooria (Author) ; Kiamehr, Mehdi (Supervisor) ; Maleki, Ali (Supervisor)
    Respect to increasing water scarcity in the world, it is necessary to ameliorate agriculture methods in order to efficiency enhancement. However, it seems that in underdeveloped counties faced with the water problem, barriers exist which prevent farmers from adopting new technologies. For researching this problem, drop pressure technology studied in Salmas County locate in West Azerbaijan state in Iran. The purpose of this research is to explore factors of lack of diffusion of new agricultural technologies in underdeveloped areas with water scarcity problem. The research problem is that notwithstanding government facilities, the diffusion rate of drop pressure technology in this area is very... 

    Design and implementation of three different methods for announcing exam grades on the web

    , Article 8th IEEE International Conference on Advanced Learning Technologies, ICALT 2008, Santander, 1 July 2008 through 5 July 2008 ; 2008 , Pages 335-337 ; 9780769531670 (ISBN) Shirali Shahreza, M ; Sharif University of Technology
    After the emergence of modern technologies in the field of information technologies (IT), virtual learning has attained a new form. The way of announcing exams' grades is an important topic in e-learning. For announcing exams' grades on the web, various methods have been proposed. In this paper, first some common methods for announcing students' grades are reviewed, then three new methods which are named "Virtual Grade", "Steganography Grades", and "Grade HIP" are introduced and the result of implementing these methods for announcing the grades of some courses at the some Iranian universities are provided. Also these methods and their results are analyzed. Finally these three new methods are... 

    A modified strategy formulation model for management technologies in holding companies: A case study of an Iranian conglomerate

    , Article International Journal of Technology Intelligence and Planning ; Volume 9, Issue 1 , 2013 , Pages 57-73 ; 17402832 (ISSN) Moghaddam, N. B ; Nedaei, H ; Sahafzadeh, M ; Hosseini, S. H ; Sharif University of Technology
    Management Technologies Strategy formulation (MTS formulation) in holding companies is carried out with the aim of achieving competitive advantages in the market and fulfilment of strategic goals of the corporation. This paper presents a modified technology strategy formulation model for MTS in holding companies. Prior to present an integrated model of MTS formulation, a number of technology strategy formulation models are analysed and their suitability for the headquarter of a holding company is discussed. Through a case study research method, the paper documents how MTS formulation was implemented in an Iranian conglomerate tasked with managing diversified subsidiaries. We concluded that... 

    Muslim scholars and technological volition

    , Article Technology in Society ; Volume 61 , 2020 Ravanbakhsh, R ; Taqavi, M ; Sharif University of Technology
    Elsevier Ltd  2020
    What purpose, according to Muslim scholars, should technological development serve? To answer this question, first we explain the views of seven Muslim scholars who have theorized about technology from an Islamic viewpoint. We then set out Carl Mitcham's fourfold analysis of technology, and summarize the views of philosophers of technology on technological volition. This places us in a position to classify Muslim scholars' opinions on technological development under seven broad headings, namely: meeting human beings' needs, implementation of an Islamic culture and lifestyle, serving human beings, serving nature, understanding the splendor of creation, providing personal and social happiness,... 

    , M.Sc. Thesis Sharif University of Technology (Author) ; Golshani, M (Supervisor)
    Most of local thinkers ,who were influenced by Western philosophers of science, and have spoken about religious knowledge, have selected experimental science as standard science and Have tried to find a way trough cultural and other non-scientific channels of science to influence the field of human knowledge by religious teaching's .This expert's are generally opposed to positivist’s models of science, but because of the nature of the Western atmosphere that they breathe, consider the experimental science as the main model of knowledge and the experience as the main method of Acquisition of knowledge. Paya is also one of this thinkers who is influenced by Karl Popper's ideas about the... 

    An empirical study on factors influencing technology transfer using structural equation modelling

    , Article International Journal of Productivity and Quality Management ; Volume 23, Issue 3 , 2018 , Pages 273-288 ; 17466474 (ISSN) Chehrehpak, M ; Alizadeh, A ; Nazari Shirkouhi, S ; Sharif University of Technology
    Inderscience Enterprises Ltd  2018
    This paper aims to determine the factors influencing technology transfer (TT) in an empirical study using structural equation modelling (SEM). A sample of 100 experts working in the National Iranian Gas Company (NIGC) as empirical study is randomly selected. The data are collected through the questionnaire and then analysed using LISREL software. Results show that law and policy, companies’ capabilities, skilled human resource, localisation of technology, and characteristics of technology significantly influence on the technology transfer. In addition, it is shown that the highest correlation is between companies’ capabilities and technology transfer. Fit indices show that the model has an... 

    A dynamic view of technological regime concept: Toward a framework for industrial policies in developing countries

    , Article 2008 Portland International Center for Management of Engineering and Technology, Technology Management for a Sustainable Economy, PICMET '08, Cape Town, 27 July 2008 through 31 July 2008 ; 2008 , Pages 395-401 ; 9781890843175 (ISBN) Rezazadeh Mehrizi, M. H ; Mozafari, A ; Sharif University of Technology
    It is beyond dispute that technological change acts as a driver of economic growth. In developing countries where highly suffer from lack of this process, incremental innovation is considered as main source of technology capability building and development In moving toward this pass and to meet with time pressure of catching up, developing countries acquire the initial required knowledge base through technology absorption from outside sources; On the other hand as development is a lengthy process, it is important that the absorbed knowledge still has the potential of more advancement in future. Therefore a selection instrument with ability of assessing different knowledge base or...