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Khadem, M.,Penkov, O.V.,Pukha, V.E.,Maleyev, M.V.,Kim, D.E. Pergamon Press ; Elsevier Science Ltd 2014 Carbon Vol.80 No.-
The wear resistance and optical properties of ultra-thin diamond-like carbon (DLC) coatings deposited on glass substrates at room temperature were investigated. The coatings were deposited using a C<SUB>60</SUB> ion beam. A sequence of surface treatments including ion-beam etching, molecular-beam deposition and ion-beam deposition were used for production of ultra-thin DLC coatings with a nano-patterned surface. The goal of the surface nano-patterning was to improve the wear resistance of the DLC coatings while maintaining a low thickness to obtain a high optical transparency. The experimental results demonstrated the excellent ability of the ultra-thin DLC coatings to improve the wear resistance of the glass substrates. A comparison between the wear rate for the DLC coating with nano-patterns and that of a more smooth coating revealed that the nano-patterned surface shows a 39% higher wear resistance. Furthermore, the coatings demonstrated a high transparency (94-97%) in the visible-light wavelength range.
Khadem, Mahdi,Park, Tae-Lim,Penkov, Oleksiy V.,Kim, Dae-Eun Elsevier 2018 SOLAR ENERGY -PHOENIX ARIZONA THEN NEW YORK- Vol.171 No.-
<P><B>Abstract</B></P> <P>Degradation of the performance and efficiency of organic solar cells (OSC) due to surface damage, caused by exposure to harsh environments, continues to be a major problem. Therefore, protective coatings must be developed that minimize damage to the outer surface of OSCs, without compromising their transparency and flexibility. For this purpose, ultra-thin, micro-patterned, single/bi-layer coatings comprised of H-free diamond-like-carbon (DLC) and indium tin oxide (ITO) were fabricated. The coatings were deposited onto polyethylene terephthalate (PET) substrates, using magnetron sputtering. The goal of the micro-patterning was to improve the wear resistance of the coatings, while maintaining the high optical transparency of PET. Optical properties, wear resistance, erosion resistance, and flexibility of the coatings were investigated. Furthermore, the performance of a pre-fabricated OSC with and without the proposed protective coating before and after the wear and erosion tests was investigated. The experimental results demonstrated that the wear resistance and transparency (of the single layer micro-patterned DLC coating), was superior to both bi-layer and continuous DLC coatings. The micro-patterned DLC coating caused very little change in transparency (less than 1.7% reduction in the visible spectrum), and reduced the wear rate (mm<SUP>3</SUP>/N·mm) of PET by ∼75%. The erosion resistance of the PET was improved, and its degree of flexibility was unaffected. Overall, the results of OSC performance analysis demonstrated the functionality and potential application of the proposed micro-patterned protective coating for flexible solar cells.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Micro-patterned functional protective coating was fabricated onto PET. </LI> <LI> Magnetron sputtering deposition technique was used. </LI> <LI> Transparency, wear and erosion resistance, and flexibility were assessed. </LI> <LI> Using micro-patterning, PET transparency and flexibility remained unaffected. </LI> <LI> The functional protective coating can improve the durability of PET-based OSCs. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Md. Khadem Ali,Md. Alamgir Hossain,신차균 한국유전학회 2013 Genes & Genomics Vol.35 No.4
Transportin 3 (TNPO3 or TRN-SR2) is a key host cellular factor involved in the early steps of several lentiviral replications. In the present study, we cloned the TNPO3 gene from CV-1 cells of African green monkey (AGM) using a homologue based cloning technology,analyzed the sequence, and evaluated the cellular expression of the proteins by western blotting and immunostaining assays. DNA sequencing of TNPO3 showed homologies of 99 % with human, rhesus monkey, chimpanzee,and baboon; the predicted protein sequence differed in only one amino acid (leucine in place of methionine). The deduced sequence revealed that AGM is phylogenetically related to human, chimpanzee, rhesus monkey, orangutan and baboon rather than bovine, rate and mouse. Western blot analysis demonstrated immunoreactive proteins in both the cytoplasmic and nuclear fractions. A similar expression pattern was observed in human and baby hamster cells. The specific detection of TNPO3 was also confirmed in the cytoplasm and nucleus by immunostaining. The present findings conclusively demonstrate that AGM-TNPO3 is genetically and physiologically almost identical with that of humans and could be a good candidate for HIV and AGM research as well as an ideal system for a TNPO3 vaccine trial.
Free vibration behavior of viscoelastic annular plates using first order shear deformation theory
Saeed Khadem Moshir,Hamidreza Eipakchi,Fatemeh Sohani 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.62 No.5
In this paper, an analytical procedure based on the perturbation technique is presented to study the free vibrations of annular viscoelastic plates by considering the first order shear deformation theory as the displacement field. The viscoelastic properties obey the standard linear solid model. The equations of motion are extracted for small deflection assumption using the Hamilton’s principle. These equations which are a system of partial differential equations with variable coefficients are solved analytically with the perturbation technique. By using a new variable change, the governing equations are converted to equations with constant coefficients which have the analytical solution and they are appropriate especially to study the sensitivity analysis. Also the natural frequencies are calculated using the classical plate theory and finite elements method. A parametric study is performed and the effects of geometry, material and boundary conditions are investigated on the vibrational behavior of the plate. The results show that the first order shear deformation theory results is more closer than to the finite elements with respect to the classical plate theory for viscoelastic plate. The more results are summarized in conclusion section.
Electrodeposition of Cu2O particles on reinforced concrete substrate
Zahra Khadem Modaresi,Fereshteh Bakhtiari,Esmaeel Darezereshki,Seyed Ahmad Ataei 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-
Cu2O as an antimicrobial agent was electrodeposited on reinforced concrete with the aim to control microbial corrosion in concrete sewers. Alkalize Cu(II) lactate were used as electrolyte and the concentration of copper sulfate was decreased from 0.6 M to 0.1 M and for lactic acid from 3 M to 0.75 M. The results showed the formation of Cu2O particles on concrete substrate. The investigation of electrodeposition time on the purity of Cu2O was revealed that increasing in the time of electrodeposition and depletion of OH ions close to the substrate caused to co-deposit of Cu or CuO with Cu2O.
Mahdi Khadem,Won-Bin Kang,Dae-Eun Kim 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.11 No.2
The use of lubricants to lower friction and wear in mechanical systems has been established for centuries. Growing concerns about the hazardous effects of conventional mineral lubricants on the environment have motivated scientists to search for biodegradable substitutes. This threat is particularly at a critical level in ecologically sensitive regions. Despite their lower eco-toxicity, the inherent shortcomings of biodegradable lubricants (e.g., high pour point, and poor oxidative and thermal stability, etc.) have prevented their full application in different industries. This review intends to (1) introduce various sources of biodegradable lubricants, their properties, and applications; (2) discuss the current state and most recent advances from the tribology perspective; and (3) discuss future trends regarding improving the tribological properties and overall performance of biodegradable lubricants.