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Some investigations on protease enzyme production kinetics using bacillus licheniformis BBRC 100053 and effects of inhibitors on protease activity
, Article International Journal of Chemical Engineering ; 2014 ; ISSN: 1687806X ; Yaghmaei, S ; Moghadam, N ; Sadeghein, B ; Sharif University of Technology
Abstract
Due to great commercial application of protease, it is necessary to study kinetic characterization of this enzyme in order to improve design of enzymatic reactors. In this study, mathematical modeling of protease enzyme production kinetics which is derived from Bacillus licheniformis BBRC 100053 was studied (at 37°C, pH 10 after 73 h in stationary phase, and 150 rpm). The aim of the present paper was to determine the best kinetic model and kinetic parameters for production of protease and calculating K i (inhibition constant) of different inhibitors to find the most effective one. The kinetic parameters K m (Michaelis-Menten constant) and V m (maximum rate) were calculated 0.626 mM and...
Diffusion induced isothermal solidification during transient liquid phase bonding of cast IN718 superalloy
, Article Canadian Metallurgical Quarterly ; Vol. 53, issue. 1 , 2014 , p. 38-46 ; Ekrami, A ; Kokabi, A. H ; Sharif University of Technology
Abstract
In transient liquid phase (TLP) bonding for commercial applications, one of the important key parameters is the holding time required for complete isothermal solidification tIS, which is a prerequisite for obtaining a proper bond microstructure. The objective of the study is to analyse the isothermal solidification kinetics during TLP bonding of cast IN718 nickel based superalloy. Experiments for TLP bonding were carried out using a Ni-7Cr-4.5Si-3Fe-3.2B (wt-%) amorphous interlayer at several bonding temperatures (1273-1373 K). The time required to obtain TLP joints free from centreline eutectic microconstituents was experimentally determined. Considering the solidification behaviour of...
Alkaline protease production by immobilized cells using B. licheniformis
, Article Scientia Iranica ; Volume 20, Issue 3 , 2013 , Pages 607-610 ; 10263098 (ISSN) ; Kazemi, A ; Nahid, P ; Yaghmaei, S ; Sabzevari, M. A ; Sharif University of Technology
2013
Abstract
In recent years there has been potential increase in the use of alkaline protease as industrial catalysts. Many major industrial and commercial applications, such as food and textile industries, and medical diagnoses, are highly dependent on the protease enzyme. In the cell immobilization technique, the free movement of microorganisms is restricted in the process, and a continuous system of fermentation can be used. In the present work, this technique has been used for alkaline protease production using different carriers, such as chitosan, corn cob and corn tassel. Enzyme activity before immobilization (72 h) was 78.3 U/ml. Corn cob, with 65% immobilization capacity and the highest enzyme...
Co channel interference cancellation by the use of iterative digital beam forming method
, Article Progress in Electromagnetics Research ; Volume 87 , 2008 , Pages 89-103 ; 10704698 (ISSN) ; Sadeghi, K. H ; Jafargholi, A ; Marvasti, F ; Sharif University of Technology
Electromagnetics Academy
2008
Abstract
This paper deals with the possibilities of cancellation of unwanted signals by steering nulls of the pattern in the direction of arrival of signal while keeping the main beam to the desired direction. New iterative adaptive digital beam forming technique is presented here to enhance the conventional effectiveness of beam forming in common commercial application. Simulation and measurement results confirm that this algorithm can achieve effective Co-Channel Interference (CCI) suppression, while increasing the strength of the desired signal
Mixed oxide nanotubes in nanomedicine: A dead-end or a bridge to the future?
, Article Ceramics International ; Volume 47, Issue 3 , 2021 , Pages 2917-2948 ; 02728842 (ISSN) ; Nasiri Tabrizi, B ; Yeong, C. H ; Madaah Hosseini, H. R ; Saber-Samandari, S ; Basirun, W. J ; Tsuzuki, T ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
Nanomedicine has seen a significant rise in the development of new research tools and clinically functional devices. In this regard, significant advances and new commercial applications are expected in the pharmaceutical and orthopedic industries. For advanced orthopedic implant technologies, appropriate nanoscale surface modifications are highly effective strategies and are widely studied in the literature for improving implant performance. It is well-established that implants with nanotubular surfaces show a drastic improvement in new bone creation and gene expression compared to implants without nanotopography. Nevertheless, the scientific and clinical understanding of mixed oxide...
Effect of samarium oxide on the electrical conductivity of plasma-sprayed SOFC anodes
, Article JOM ; Volume 68, Issue 10 , 2016 , Pages 2569-2573 ; 10474838 (ISSN) ; Samadi, H ; Nemati, A ; Sharif University of Technology
Minerals, Metals and Materials Society
Abstract
Solid oxide fuel cells (SOFCs) are rapidly becoming recognized as a new alternative to traditional energy conversion systems because of their high energy efficiency. From an ecological perspective, this environmentally friendly technology, which produces clean energy, is likely to be implemented more frequently in the future. However, the current SOFC technology still cannot meet the demands of commercial applications due to temperature constraints and high cost. To develop a marketable SOFC, suppliers have tended to reduce the operating temperatures by a few hundred degrees. The overall trend for SOFC materials is to reduce their service temperature of electrolyte. Meanwhile, it is...
Deep cross altitude visual interpretation for service robotic agents in smart city
, Article 2018 6th Iranian Joint Congress on Fuzzy and Intelligent Systems ; Volume 2018-January , 2018 , Pages 79-82 ; 9781538628362 (ISBN) ; Majidi, B ; Manzuri, M. T ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2018
Abstract
Multi-agent robotic platforms are increasingly used for various commercial applications. In this paper, a cross altitude visual analytic framework for a group of robots, singularly referred to as MOdular RApidly Deployable Decision Support Agent (MORAD DSA), used for decision support and various services in the smart city environment is presented. The robotic subsystem consists of two agents operating in different altitudes. These agents give the decision support system the ability to have encompassing view of the operating environment. The visual analytic system which is the focus of this paper uses a deep convolutional neural network to learn the complex patterns required by the urban...
Mixed oxide nanotubes in nanomedicine: A dead-end or a bridge to the future?
, Article Ceramics International ; 2020 ; Nasiri Tabrizi, B ; Yeong, C. H ; Madaah Hosseini, H. R ; Saber Samandari, S ; Basirun, W. J ; Tsuzuki, T ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
Nanomedicine has seen a significant rise in the development of new research tools and clinically functional devices. In this regard, significant advances and new commercial applications are expected in the pharmaceutical and orthopedic industries. For advanced orthopedic implant technologies, appropriate nanoscale surface modifications are highly effective strategies and are widely studied in the literature for improving implant performance. It is well-established that implants with nanotubular surfaces show a drastic improvement in new bone creation and gene expression compared to implants without nanotopography. Nevertheless, the scientific and clinical understanding of mixed oxide...
Electrochemical performance and elevated temperature properties of the TiO2-Coated Li[Ni0.8Co0.1Mn0.1]O2 cathode material for high-safety li-ion batteries
, Article ACS Applied Energy Materials ; Volume 4, Issue 5 , 2021 , Pages 5304-5315 ; 25740962 (ISSN) ; Azar, M. K ; Esmaeili, M ; Malekpour, N ; Hosseini Hosseinabad, S. M ; Moakhar, R. S ; Dolati, A ; Ramakrishna, S ; Sharif University of Technology
American Chemical Society
2021
Abstract
Nowadays, the LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode material has attracted great research interest due to its high energy density and less usage of costly raw materials. However, the high nickel content of NCM811 brings about an extremely unstable interface between the electrode and electrolyte and therefore inferior cyclic stability. Herein, we have proposed a straightforward method to deliver 1, 2, and 4 wt % of TiO2 nanoparticles (NPs) on the surface of the NCM811 cathode material and to improve its properties at room and high temperatures. Based on scanning electron microscopy and transmission electron microscopy observations, the coating thickness varies from 10 to 35 nm and the 2 wt %...