Investigation of synergistic effect of nano sized Ag/TiO2 particles on antibacterial, physical and mechanical properties of UV-curable clear coatings by experimental design

, Article Progress in Organic Coatings ; Vol. 77, issue. 2 , February , 2014 , pp. 502-511 ; ISSN: 03009440 Labbani-Motlagh, A ; Bastani, S ; Hashemi, M. M ; Sharif University of Technology

2014

Abstract

The synergistic effect of nano titanium dioxide (10 and 30 nm) and nano silver (10 nm) as antibacterial agents were investigated on UV curable clear coating. Antibacterial and physical-mechanical properties of coating were optimized using experimental design in response surface method. Twenty different samples of nano Ag and nano TiO2 were prepared in this method. Antibacterial properties on Gram-negative bacteria (Escherichia coli) were investigated. The results revealed that using equal amounts of two sizes of nano TiO2 promote the antibacterial activity of nano Ag. So, the coating shows strong activity against E. coli. Physical-mechanical properties such as surface hardness, abrasion...

Optimization Model of Water-energy Nexus in the Cooling Towers

, M.Sc. Thesis Sharif University of Technology Shokri Motlagh, Shamim (Author) ; Avami, Akram (Supervisor)

Abstract

One of the best ways to reduce water consumption is using air cooled heat exchangers, because they work in a completely closed cycle which does not require makeup water. However because of their high surface area and high-technology production method, their production cost is significantly high. Air cooled heat exchangers have relatively high exergy destruction because of low U heat-transfer coefficient. In present research, single-objective and multiple objective optimization problems are developed to minimize total annual cost and exergy destruction. Also the influence of temperature changes on these two objective functions have been evaluated by Monte Carlo simulation. In next step,...

Study of Some Effective Parameters on Uv Curable Coating Containing Nano Silver

, M.Sc. Thesis Sharif University of Technology Labbani Motlagh, Akram (Author) ; Mahmoodi Hashemi, Mohammed (Supervisor) ; Bastani, Saeed (Co-Advisor)

Abstract

Antibacterial coatings are a branch of paints and coatings industry that has a wide application from Clothing and Textiles to Floor and Medical instrument. Different antibacterial agents such as silver, titanium dioxide, zinc oxide, gold, chitosan, Silicon dioxide, Magnesium hydroxide and carbon nanotubes have been used. UV curable coatings are economic and environmentally friendly coatings and they are one of the fastest growing segments in the paint and coatings industry. Many studies have been conducted on UV curable coatings and their properties. Among different resins, The UV curable polyurethane offer properties such as: Excellent hardness, High gloss, good chemical and weather...

A note on isometries of Lipschitz spaces

, Article Journal of Mathematical Analysis and Applications ; Vol. 411, Issue. 2 , 2014 , Pages 555-558 ; ISSN: 0022247X Ranjbar Motlagh, A ; Sharif University of Technology

2014

Abstract

The main purpose of this article is to generalize a recent result about isometries of Lipschitz spaces. Botelho, Fleming and Jamison [2] described surjective linear isometries between vector-valued Lipschitz spaces under certain conditions. In this article, we extend the main result of [2] by removing the quasi-sub-reflexivity condition from Banach spaces

An integral type characterization of constant functions on metric-measure spaces

, Article Journal of Mathematical Analysis and Applications ; Volume 385, Issue 1 , January , 2012 , Pages 194-201 ; 0022247X (ISSN) Ranjbar Motlagh, A ; Sharif University of Technology

2012

Abstract

The main purpose of this article is to generalize a characterization of constant functions to the context of metric-measure spaces. In fact, we approximate a measurable function, in terms of a certain integrability condition, by Lipschitz functions. Then, similar to Brezis (2002) [2], we establish a necessary and sufficient condition in order that any measurable function which satisfies an integrability condition to be constant a.e. Also, we provide a different proof for the main result of Pietruska-Pałuba (2004) [7] in the setting of Dirichlet forms

Generalized rademacher-stepanov type theorem and applications

, Article Zeitschrift fur Analysis und ihre Anwendung ; Volume 28, Issue 3 , 2009 , Pages 249-275 ; 02322064 (ISSN) Ranjbar Motlagh, A ; Sharif University of Technology

2009

Abstract

The main purpose of this article is to generalize a theorem of Stepanov which provides a necessary and sufficient condition for almost everywhere differentiability of functions over Euclidean spaces. We state and prove an Lp-type generalization of the Stepanov theorem and then we extend it to the context of Orlicz spaces. Then, this generalized Rademacher-Stepanov type theorem is applied to the Sobolev and bounded variation maps with values into a metric space. It is shown that several generalized differentiability type theorems are valid for the Sobolev maps from a Lipschitz manifold into a metric space. As a byproduct, it is shown that the Sobolev spaces of Korevaar-Schoen and Reshetnyak...

A non-existence theorem for isometric immersions

, Article Journal of Geometry and Physics ; Volume 59, Issue 3 , 2009 , Pages 263-266 ; 03930440 (ISSN) Ranjbar Motlagh, A ; Sharif University of Technology

2009

Abstract

Let f : M {long rightwards arrow} over(M, -) be an isometric immersion between Riemannian manifolds. For certain conditions on M and over(M, -) in terms of curvatures and external diameter, we extend the non-embedding theorem of Chern and Kuiper to the isometric immersions of non-compact manifolds. Also, our results generalize and improve the main results of Jorge and Koutroufiotis [L. Jorge, D. Koutroufiotis, An estimate for the curvature of bounded submanifolds, Amer. J. Math. 103 (4) (1981) 711-725] and Veeravalli [A. R. Veeravalli, A sharp lower bound for the Ricci curvature of bounded hypersurfaces in space forms, Bull. Austral. Math. Soc. 62 (1) (2000) 165-170]. © 2008 Elsevier B.V....

An integral type characterization of lipschitz functions over metric-measure spaces

, Article Journal of Mathematical Analysis and Applications ; Volume 479, Issue 2 , 2019 , Pages 1708-1714 ; 0022247X (ISSN) Ranjbar Motlagh, A ; Sharif University of Technology

Academic Press Inc 2019

Abstract

The main purpose of this article is to generalize a characterization of Lipschitz functions in the context of metric-measure spaces. The results are established in the class of metric-measure spaces which satisfy a strong version of the doubling (Bishop-Gromov regularity) condition. Indeed, we establish a necessary and sufficient condition in order that any measurable function which satisfies an integrability condition to be essentially Lipschitzian. © 2019 Elsevier Inc

Isometries of Lipschitz type function spaces

, Article Mathematische Nachrichten ; Volume 291, Issue 11-12 , 2018 , Pages 1899-1907 ; 0025584X (ISSN) Ranjbar Motlagh, A ; Sharif University of Technology

Wiley-VCH Verlag 2018

Abstract

In this article, we describe isometries over the Lipschitz spaces under certain conditions. Indeed, we provide a unified proof for the main results of and in a more general setting. Finally, we extend our results for some other functions spaces like the space of vector-valued little Lipschitz maps and pointwise Lipschitz maps. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

A remark on the bourgain-brezis-mironescu characterization of constant functions

, Article Houston Journal of Mathematics ; Volume 46, Issue 1 , 2020 , Pages 113-115 Ranjbar Motlagh, A ; Sharif University of Technology

University of Houston 2020

Abstract

A remark on isometries of absolutely continuous spaces

, Article Journal of Function Spaces ; Volume 2020 , 2020 Ranjbar Motlagh, A ; Sharif University of Technology

Hindawi Limited 2020

Abstract

The purpose of this article is to study the isometries between vector-valued absolutely continuous function spaces, over compact subsets of the real line. Indeed, under certain conditions, it is shown that such isometries can be represented as a weighted composition operator. © 2020 Alireza Ranjbar-Motlagh

Generalizations of the Liouville theorem

, Article Differential Geometry and its Application ; Volume 26, Issue 3 , 2008 , Pages 339-345 ; 09262245 (ISSN) Ranjbar-Motlagh, A ; Sharif University of Technology

2008

Abstract

The purpose of this paper is to generalize the Liouville theorem for functions which are defined on the complete Riemannian manifolds. Then, we apply it to the isometric immersions between complete Riemannian manifolds in order to obtain an estimate for the size of the image of immersions in terms of the supremum of the length of their mean curvature vector in a quite general setting. The proofs are based on the Calabi's generalization of maximum principle for functions which are not necessarily differentiable. © 2007 Elsevier B.V. All rights reserved

Isometries between spaces of vector-valued differentiable functions

, Article Journal of Function Spaces ; Volume 2021 , 2021 ; 23148896 (ISSN) Ranjbar Motlagh, A ; Sharif University of Technology

Hindawi Limited 2021

Abstract

A note on the Poincaré inequality

, Article Studia Mathematica ; Volume 154, Issue 1 , 2003 , Pages 1-11 ; 00393223 (ISSN) Ranjbar Motlagh, A ; Sharif University of Technology

Instytut Matematyczny 2003

Abstract

The Poincaré inequality is extended to uniformly doubling metric-measure spaces which satisfy a version of the triangle comparison property. The proof is based on a generalization of the change of variables formula

Besov type function spaces defined on metric-measure spaces

, Article Journal of Mathematical Analysis and Applications ; Volume 505, Issue 2 , 2022 ; 0022247X (ISSN) Ranjbar Motlagh, A ; Sharif University of Technology

Academic Press Inc 2022

Abstract

The purpose of this article is to study the Besov type function spaces for maps which are defined on abstract metric-measure spaces. We extend some of the embedding theorems of the classical Besov spaces to the setting of abstract spaces. © 2021 Elsevier Inc

Poincaré inequality for abstract spaces

, Article Bulletin of the Australian Mathematical Society ; Volume 71, Issue 2 , 2005 , Pages 193-204 ; 00049727 (ISSN) Ranjbar-Motlagh, A ; Sharif University of Technology

Australian Mathematical Publishing Association 2005

Abstract

The Poincaré inequality is generalised to metric-measure spaces which support a strong version of the doubling condition. This generalises the Poincaré inequality for manifolds whose Ricci curvature is bounded from below and metric-measure spaces which satisfy the measure contraction property. Copyright Clearance Centre, Inc

A banach—stone type theorem for space of vector-valued differentiable maps

, Article Analysis Mathematica ; Volume 49, Issue 3 , 2023 , Pages 841-854 ; 01333852 (ISSN) Ranjbar Motlagh, A ; Sharif University of Technology

Akademiai Kiado ZRt 2023

Abstract

Feasibility and Supply an Optimal Integrated Model of the Energy and Exergy for Producing of Biogas and Ethanol from Solid Waste and wastewaters flows: in Tehran

, M.Sc. Thesis Sharif University of Technology Vali, Fatemeh (Author) ; Avami, Akram (Supervisor)

Abstract

In recent years, access to clean energy sources is the major instruments for sustainable development. Limitation of energy resources and the problems resulting from the use of fossil fuels was caused attention to biomass in different countries as a stable source of renewable energy. Organic waste in municipal solid waste and domestic wastewater are biomasses that can be used as a raw material used in the production of energy. Practical studies show that quality and quantity of municipal solid waste to produce biogas and bioethanol in Iran is very appropriate. In this process, the household solid waste and wastewater are in the anaerobic digestion reactors and fermentation systems without any...

Techno-Economical Analysis and Modeling of Carbon Capturing from Flue Gas by Adsorption

, M.Sc. Thesis Sharif University of Technology Rostami, Fatemeh (Author) ; Avami, Akram (Supervisor)

Abstract

Population growth require increasing demand of Energy. The fossil fuels are the main source of energy. However, they are main source of carbon dioxide emissions. Considerable amount of fossil fuels is used in the power plants. Increasing trend of electricity consumption as well as the lack of alternative fuels such as renewables in the short time will increase the consumption of fossil fuels and emissions. The most important greenhouse gas emitted from the power plants is carbon dioxide. That's why the separation of carbon dioxide from the gas stream of power plants is necessary.Separation of the carbon dioxide by adsorption is considered in this project both experimentally and...

Development of Cement Production Model to Reduce and Capture CO2 Emissions

, M.Sc. Thesis Sharif University of Technology Baramaki, Morteza (Author) ; Avami, Akram (Supervisor)

Abstract

Energy consumption and pollutions especially carbon dioxide emissions are two of the main challenges in the cement industry. 5-7 percent of world’s carbon dioxide emissions is due to cement production while 900 kg of carbon dioxide is emitted for the production of a tone of cement. The main source of carbon dioxide emissions in a cement plant is the combustion of fuel to provide heating demands and also converting the ore into clinker. Therefore, any improvement in energy efficiency in a cement plant could reduce carbon dioxide emissions resulting from the combustion. Important ways of energy recovery in a cement plant are using the energy recovered from the exhaust gas in the preheater...