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    Synthesize of Graphene Nanoribbons with a Non-Zero Energy Band Gap for Inactivation of Alive Cells Using Infrared Irradiation

    , M.Sc. Thesis Sharif University of Technology Emamy, Hamed (Author) ; Akhavan, Omid (Supervisor)
    Graphene is a one layer atom thickness and zero energy gap so for using it in nano electronic and transistors baised on graphene it's energy gap should be opened.one of the methods for opening graphene band gap is creating nano scale boundaries or synthesize graphene nanoribbons. One of the new methods for graphene nanoribbon synthesize is longitudinal opening of carbon nanotube. In this thesis graphene nanoribbons synthesize with this method and analyze with AFM and Raman spectroscopy. Carbon nanotubes also have energy gap and IR absorption recently they used for living cell destruction. In this thesis we synthesize graphene nanoribbons and analyzing their optical absorption and use it for... 

    Synthesis and X-ray structural characterization of unsymmetrical tetradentate complexes of Ni(II) and Cu(II)

    , Article Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry ; Volume 32, Issue 2 , 2002 , Pages 345-355 ; 00945714 (ISSN) Lashanizadegan, M ; Boghaei, D. M ; Sharif University of Technology
    The unsymmetrical tetradentate Schiff base H2L was prepared by the reaction of salicylaldehyde with the mono Schiff base derived from o-phenylenediamine and o-hydroxyacetophenone (HL1). NiL and CuL complexes were prepared and characterized by 1H NMR, IR and single crystal X-ray structure determination. Crystal data for NiL: triclinic space group P-1, a = 7.190 (2) Å, b = 13.059 (4) Å, c = 17.867 (10) Å, α = 74.888 (10)°, β = 84.206 (10)°, γ = 86.542 (2)° and z = 4. Crystal data for CuL: monoclinic space group P2I/n, a = 12.8209 (6) Å, b = 6.988 (3) Å, c = 18.601 (9) Å, β = 105.15° and z = 4. The Ni and Cu atoms have a slightly distorted square-planar coordination geometry  

    Applying Infrared Thermography for Monitoring the Condition and Failure Diagnosis of Power Network

    , M.Sc. Thesis Sharif University of Technology Seyed Shobeiri, Pooya ; Toossi, Amir (Author) ; Ghodrati, Behzad (Supervisor)
    Temperature and the resulting thermal behavior of electric power generation and distribution equipment and industrial electrical systems and processes are the most critical factors in the reliability of any operation or facility. Temperature is by far the most measured quantity in any industrial environment. For these reasons, monitoring the thermal operating condition of electrical and electromechanical equipment is considered to be a key factor to increasing operational reliability. Infrared thermography (IR/T) as a condition monitoring technique is used to remotely gather thermal information for monitoring the condition of virtually all of the electrical components on an entire system and... 

    Design and Construction of a Vein Display Device by Near Infrared Wave

    , M.Sc. Thesis Sharif University of Technology Rezaei, Alireza (Author) ; Vosoghi Vahdat, Bizhan (Supervisor)
    The process of vein is a simple yet important process. This process may, in some cases, have problems that can cause the patient to be harmed as well as in some cases.In this project, we were able to imagine the veins by designing and manufacturing a device with a near -infrared wave and a handle of Razbari Pie and the anatomy of the hand, as well as processing this image and becoming a suitable image for nurses. do . First, the image of the veins was captured by infrared LEDs with infrared LEDs with an infrared camera and then processed by the Python Camera Picture program, which is based on anatomy -based process using morphological operations. And we've displayed. The video is taken and... 

    Iterative method for fusion of infrared and visible images

    , Article 9th International Symposium on Telecommunication, IST 2018, 17 December 2018 through 19 December 2018 ; 2019 , Pages 652-657 ; 9781538682746 (ISBN) Zamani, H ; Zarmehi, N ; Marvasti, F ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2019
    This paper proposes a novel fusion method for visible and infrared images. The infrared and visible samples are obtained by a sampling pattern such as star and spiral. Then, the samples are fused according to fusion rules. Finally, the proposed method is applied to fuse the infrared and visible samples. The proposed method is iterative and a significant advantage of it, besides its superior performance, is that it is faster than the previous compressive sensing based fusion methods. The simulation results confirm the success of the proposed method for fusion of infrared and visible images. © 2018 IEEE  

    An investigation on electrochromic properties of (WO3)1-x-(Fe2O3)x thin films

    , Article Thin Solid Films ; Volume 515, Issue 2 SPEC. ISS , 2006 , Pages 644-647 ; 00406090 (ISSN) Azimirad, R ; Akhavan, O ; Moshfegh, A. Z ; Sharif University of Technology
    Elsevier  2006
    In this research, the effect of Fe2O3 content on the electrochromic properties of WO3 in thermally evaporated (WO3)1-x-(Fe2O3)x thin films (0 ≤ x ≤ 0.4) has been studied. The atomic composition of the deposited metal oxides was determined by X-ray photoelectron spectroscopy analysis. The surface morphology of the thin films has been examined by atomic force microscopy. The surface roughness of all the films was measured about 1.3 nm with an average lateral grain size of 30 nm showing a smooth and nanostructured surface. The electrochromic properties of (WO3)1-x-(Fe2O3)x thin films deposited on ITO/glass substrate were studied in a LiClO4 + PC electrolyte by using ultraviolet-visible... 

    Satellite Orbit and Attitude Estimation Using Temperature Data

    , M.Sc. Thesis Sharif University of Technology Nasihati Gourabi, Forough (Author) ; Pourtakdoust, Hossein (Supervisor) ; Kiani, Maryam (Supervisor)
    The problem of concurrent attitude and orbit estimation (CAOE) of satellite using its surface thermal data is studied and investigated in the present dissertation. Considering various uncertainties associated with the satellite system and its surrounding with regards to thermal issues, the dissertation subject and its application to CAOE is challenging and of importance. To this aim, the space thermal model for low Earth orbiting (LEO) satellite is initially reviewed and presented. Since the Sun and the Earth are considered as significant sources of radiation for near Earth space systems, the view factor is a key parameter for orbit observability and estimation via surface thermal data.... 

    Enhanced solar still condensation by using a radiative cooling system and phase change material

    , Article Desalination ; Volume 467 , 2019 , Pages 43-50 ; 00119164 (ISSN) Amarloo, A ; Shafii, M. B ; Sharif University of Technology
    Elsevier B.V  2019
    In this study, an experimental investigation of using the radiative cooling potential in a solar still was studied. Instead of using an auxiliary radiative panel, an integrated collector was utilized for both processes of absorption of solar radiations and emission of infrared radiations for radiative cooling. At night-time, the coldness was stored in the PCM inside the PCM-condenser. While during the day, the water was evaporated in an evaporation tank, the produced vapor was directed to the PCM-condenser and the air cooled-condenser. Different condenser configurations were tested to evaluate the effect of radiative cooling on daily yield and solar still efficiency. The lower temperature of... 

    Substrate and device pattern dependence of the thermal crosstalk in y Ba 2Cu 3O 7-δ transition edge bolometer arrays

    , Article IEEE Transactions on Applied Superconductivity ; Volume 16, Issue 4 , 2006 , Pages 1953-1958 ; 10518223 (ISSN) Bozbey, A ; Fardmanesh, M ; Schubert, J ; Banzet, M ; Sharif University of Technology
    Using YBa 2Cu 3O 7-δ (YBCO) thin films, pulsed laser deposited on 1-mm-thick LaAlO 3 or SrTiO 3 substrates, we made 4 × 1 pixel arrays of transition edge bolometers with separations between neighboring pixels ranging from 40 μm to 170 μm for testing purposes. We investigated the effects of the YBCO film thickness (200 and 400 nm), substrate material, and back-etching of the substrate, on the crosstalk between the pixels of the arrays. The investigation was based on the analysis of the voltage response of the dc current biased bolometers versus the modulation frequency of a near-infrared laser source. We observed that the bolometer arrays made of 400-nm-thick films had less interpixel thermal... 

    Intermittency of height fluctuations in stationary state of the Kardar-Parisi-Zhang equation with infinitesimal surface tension in 1+1 dimensions

    , Article Physical Review E - Statistical, Nonlinear, and Soft Matter Physics ; Volume 70, Issue 3 1 , 2004 , Pages 031101-1-0311011-3 ; 15393755 (ISSN) Tabei, S. M. A ; Bahraminasab, A ; Masoudi, A. A ; Mousavi, S. S ; Tabar, M. R. R ; Sharif University of Technology
    Intermittency of height fluctuations in stationary state of the Kardar-Parisi-Zhang (KPZ) equation with infinitesimal surface tension in 1+1 dimensions was discussed. Stochastic differential equations were used for the study. It was found that the probability density function [in 1+1] is independent of the coefficient of the linear term. When the random force with smooth spatial correlation was considered, the problem changed to a more complicated one  

    Transabdominal fetal heart rate detection using NIR photopleythysmography: instrumentation and clinical results

    , Article IEEE Transactions on Biomedical Engineering ; Volume 56, Issue 8 , 2009 , Pages 2075-2082 ; 00189294 (ISSN) Gan, K. B ; Zahedi, E ; Mohd Ali, M. A ; Sharif University of Technology
    In obstetrics, fetal heart rate (FHR) detection remains the standard for intrapartum assessment of fetal well-being. In this paper, a low-power (<55 mW) optical technique is proposed for transabdominal FHR detection using near-infrared photoplesthys-mography (PPG). A beam of IR-LED (890 nm) propagates through to the maternal abdomen and fetal tissues, resulting in a mixed signal detected by a low-noise detector situated at a distance of 4 cm. Low-noise amplification and 24-bit analog-to-digital converter resolution ensure minimum effect of quantization noise. After synchronous detection, the mixed signal is processed by an adaptive filter to extract the fetal signal, whereas the PPG from the... 

    On-line orbit and albedo estimation using a strong tracking algorithm via satellite surface temperature data

    , Article IEEE Transactions on Aerospace and Electronic Systems ; 9 December , 2020 Nasihati Gourabi, F ; Kiani, M ; Pourtakdoust, S. H ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2020
    The Earth albedo factor (EAF) is a major required parameter for the thermal analysis of low Earth orbit (LEO) satellites. Satellites receive variable albedo radiation as they orbit around the Earth that is heavily dependent on the Earth's local terrain as well as the instantaneous cloud coverage. However, for satellite thermal balancing and control analysis, a constant mean EAF is usually taken based on the orbital parameters that could potentially introduce erroneous results. Recent advances in temperature-based orbit estimation (TBOE) algorithms have revealed a significant sensitivity concerning EAF giving rise to the idea of its on-line estimation for added accuracy. In this sense, a... 

    Satellite pose estimation using Earth radiation modeled by artificial neural networks

    , Article Advances in Space Research ; Volume 70, Issue 8 , 2022 , Pages 2195-2207 ; 02731177 (ISSN) Nasihati Gourabi, F ; Kiani, M ; Pourtakdoust, S. H ; Sharif University of Technology
    Elsevier Ltd  2022
    The thermal energy received by each surface of an Earth-orbiting satellite strongly depends on its position and orientation. In this sense, simultaneous orbit and attitude estimation (SOAE) using the surface temperature data has been focused in the present study. The Earth infrared (IR) radiation and the Earth's top-of-atmosphere (TOA) albedo are two key sources of radiation affecting the satellite surface temperature rate. The Earth's radiation information has been monitored for the past two decades by the Clouds and the Earth's Radiant Energy System (CERES) project, producing a comprehensive set of Earth radiation budget (ERB) data for climate, weather and applied science research. The... 

    Polyphenols attached graphene nanosheets for high efficiency NIR mediated photodestruction of cancer cells

    , Article Materials Science and Engineering C ; Volume 33, Issue 3 , 2013 , Pages 1498-1505 ; 09284931 (ISSN) Abdolahad, M ; Janmaleki, M ; Mohajerzadeh, S ; Akhavan, O ; Abbasi, S ; Sharif University of Technology
    Green tea-reduced graphene oxide (GT-rGO) sheets have been exploited for high efficiency near infrared (NIR) photothermal therapy of HT29 and SW48 colon cancer cells. The biocompatibility of GT-rGO sheets was investigated by means of MTT assays. The polyphenol constituents of GT-rGO act as effective targeting ligands for the attachment of rGO to the surface of cancer cells, as confirmed by the cell granularity test in flow cytometry assays and also by scanning electron microscopy. The photo-thermal destruction of higher metastatic cancer cells (SW48) is found to be more than 20% higher than that of the lower metastatic one (HT29). The photo-destruction efficiency factor of the GT-rGO is... 

    Determination of a suitable thin layer drying curve model for saffron (Crocus sativus L) stigmas in an infrared dryer

    , Article Scientia Iranica ; Volume 18, Issue 6 , 2011 , Pages 1397-1401 ; 10263098 (ISSN) Akhondi, E ; Kazemi, A ; Maghsoodi, V ; Sharif University of Technology
    The drying of saffron stigma was investigated in a laboratory infrared dryer. The effect of temperature on the drying rate of samples at various temperatures (60,70...110 °C) was studied. The drying time decreased with an increase in drying air temperature. The constant-rate period is absent from the drying curve. The drying of saffron occurred in the falling rate period. Four, thin-layer drying models, namely, Lewis, Handerson and Pabis, Page, and Midilli and Kucuk, were fitted to drying data. The performance of these models was investigated by comparing the determination of coefficient ( R2) and Root Mean Square Error (RMSE) between the observed and predicted moisture ratios. Among these... 

    Reduced polydopamine coated graphene for delivery of Hset1 antisense as A photothermal and gene therapy of breast cancer

    , Article Journal of Drug Delivery Science and Technology ; Volume 73 , 2022 ; 17732247 (ISSN) Babavalian, A ; Tekie, F. S. M ; Ayazi, H ; Ranjbar, S ; Varshochian, R ; Rad-Malelkshahi, M ; Akhavan, O ; Dinarvand, R ; Sharif University of Technology
    Editions de Sante  2022
    Breast cancer is the most prevalent type of cancer in women; hence, many researches have been focused on developing effective treatment protocols. In this study, a novel nanocarrier was fabricated for gene and photothermal combination cancer therapy by conjugating histone methyltransferase complex subunit SET1 (hSET1) on reduced polydopamine coated graphene oxide nanosheets (rGO-PDA). The rGO-PDA nanocarriers provide higher near-infrared absorption and further integrating with hSET1 antisense as an anticancer gene that down-regulates the amount of hSET1 overexpressed and suppresses the proliferation of cancer cells. The nanoplatform was prepared by polymerizing of dopamine, a mussel adhesive... 

    Improving mechanical properties and biocompatibility of 3D printed PLA by the addition of PEG and titanium particles, using a novel incorporation method

    , Article Bioprinting ; Volume 27 , 2022 ; 24058866 (ISSN) Asadollahi, M ; Gerashi, E ; Zohrevand, M ; Zarei, M ; Sayedain, S. S ; Alizadeh, R ; Labbaf, S ; Atari, M ; Sharif University of Technology
    Elsevier B.V  2022
    Polylactic acid (PLA) scaffolds produced by the fused deposition modeling (FDM) method have biocompatibility, close Young's modulus to that of bone, and the ability to make complex shapes. However, PLA has some drawbacks like brittleness, inappropriate mechanical strength and hydrophobicity, and a low degradation rate. In this study, polyethylene glycol (PEG) (5 and 10 wt%) by solving method and titanium (Ti) particles (5 wt%) by two different methods were mixed with PLA to address the mentioned problems. Extruded filaments were investigated by X-ray diffraction (XRD), differential scanning calorimetry (DSC), and fourier transform infrared (FTIR). Surface morphology of the produced filaments... 

    Feasibility of infrared tracking of beating heart motion for robotic assisted beating heart surgery

    , Article International Journal of Medical Robotics and Computer Assisted Surgery ; Volume 14, Issue 1 , February , 2018 ; 14785951 (ISSN) Mansouri, S ; Farahmand, F ; Vossoughi, G ; Ghavidel, A. A ; Rezayat, M ; Sharif University of Technology
    John Wiley and Sons Ltd  2018
    Background: Accurate tracking of the heart surface motion is a major requirement for robot assisted beating heart surgery. Method: The feasibility of a stereo infrared tracking system for measuring the free beating heart motion was investigated by experiments on a heart motion simulator, as well as model surgery on a dog. Results: Simulator experiments revealed a high tracking accuracy (81 μm root mean square error) when the capturing times were synchronized and the tracker pointed at the target from a 100 cm distance. The animal experiment revealed the applicability of the infrared tracker with passive markers in practical heart surgery conditions. Conclusion: With the current technology,... 

    Effective factors in the treatment of kerosene-water emulsion by using UF membranes

    , Article Journal of Hazardous Materials ; Volume 161, Issue 2-3 , 2009 , Pages 1216-1224 ; 03043894 (ISSN) Rezvanpour, A ; Roostaazad, R ; Hesampour, M ; Nyström, M ; Ghotbi, C ; Sharif University of Technology
    The effects of different parameters including membrane type (regenerated cellulose and polysulphone), transmembrane pressure (TMP), the content of oil in the feed, the flow velocity of the feed and pH on the ultrafiltration of an emulsion of kerosene in water were studied. It was found that the important factors affecting ultrafiltration were, in order, membrane type, pressure and oil concentration. The greatest flux at the optimum conditions here of 3 bar, an oil content of 3% (v/v) and with membrane type C30F was predicted as 108 L/(m2 h) that was within the range of the confidence limit of the measured value of 106 L/(m2 h). The normalised FTIR results of the virgin cellulosic membranes...