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Basavaraj, E.,Ramaraj, B.,Lee, Joong‐,Hee,Siddaramaiah, Wiley Subscription Services, Inc., A Wiley Company 2013 Polymer engineering and science Vol.53 No.8
<P><B>Abstract</B></P><P>With an objective to investigate the influence of molybdenum disulphide (MoS<SUB>2</SUB>) on physico–mechanical and tribological properties of polyamide 66 (PA 66), was compounded with MoS<SUB>2</SUB> in the presence of carbon black (CB). The compounded material was injection molded to make test specimens to evaluate physico–mechanical, thermal, and tribological (wear, friction, and laser etching) characteristics. It was found that tensile strength, percentage elongation at break, and tensile modulus of PA 66/CB/MoS<SUB>2</SUB> composite increased linearly with increase in MoS<SUB>2</SUB> content. The impact strength of the PA 66 matrix increased from 37.2 to 43.2 J/m with an increase in MoS<SUB>2</SUB> content. The wear behavior of PA 66/CB/MoS<SUB>2</SUB> composites have been investigated under dry sliding conditions at different normal loads, sliding distances, and sliding velocities at room temperature. It was found that the introduction of MoS<SUB>2</SUB> in the presence of CB has certainly reduced the friction, wear behavior of PA 66 with improvement in laser etching resistance. MoS<SUB>2</SUB> could increase the adhesion between the transfer film and the counterface surface. The ability of the synergistic fillers in helping the formation of thin, uniform, and continuous transfer film would contribute to enhance the wear resistance of PA 66 composites. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers</P>
Basavaraj S. Anami,Naveen N. M.,N. G. Hanamaratti 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.4
Computer vision applications in the field of agriculture science are gaining importance. The paper presents a method for recognition of paddy varieties from bulk paddy grain image samples based on color texture features extracted from color co-occurrence matrices. The color texture features are obtained from H, S and I color planes and their combinations. The feature set is reduced based on contribution of features to the recognition accuracy. The reduced feature set of the HS plane includes Energy, Entropy and Correlation features from Hue plane and Energy, Entropy, Contrast, and Correlation features from Saturation plane. The paddy grain images are recognized using a multilayer feed-forward artificial neural network. The considered fifteen paddy varieties have given the recognition accuracy of 92.33%. The work is useful in developing a machine vision system for agriculture produce market and developing multimedia applications in agriculture sciences.
Development and evaluation of psyllium seed husk polysaccharide based wound dressing films
Basavaraj S. Patil,Vinayak S. Mastiholimath,Anandrao R. Kulkarni 경희대학교 융합한의과학연구소 2011 Oriental Pharmacy and Experimental Medicine Vol.11 No.2
In the present study, wound dressing films were fabricated using Seed Husk of Psyllium (SHP) complexed with povidone iodine and were evaluated for various physicochemical properties as well as wound healing activity in albino rats. The required film properties for the successful wound dressings, such as film elongation (elasticity), tensile strength, water uptake and water vapor transmission rates (WVTR) were examined. Results indicated that SHP films showed good elasticity (80.27–116.24%) and acceptable tensile strengths (8.33–22.13 N/mm2). SHP films were evaluated for water absorption pattern as well as permeation to water vapours and results showed that films were able to swell in water upto 167 to 191% w/w and WVTR were in the range between 8.23×10−3 to 1.12×10−4 g.cm2/day. Selected formulation of SHP films with optimum characteristics were loaded with Povidone iodine (PI) solution by soaking method and were evaluated for antimicrobial and wound healing activity on excision wound model. Results indicated that PI loaded films showed significant antibacterial activity against both gram positive and gram negative selected bacteria. PI loaded SHP films showed comparatively better wound healing property to control group with faster epithelialization and greater rates of wound contraction.
Oxygen plasma treated epitaxial ZnO thin films for Schottky ultraviolet detection
Angadi, Basavaraj,Park, H C,Choi, H W,Choi, J W,Choi, W K Institute of Physics [etc.] 2007 Journal of Physics. D, Applied Physics Vol.40 No.5
<P>The effects of oxygen plasma treatment on epitaxial ZnO thin films grown by molecular beam epitaxy were studied. The Au–ZnO–In junction exhibiting ohmic behaviour before the treatment gradually changes to a Schottky junction with the increase in oxygen plasma treatment time. The crystallinity and the surface microstructure did not change to any great extent after the treatment. However, the x-ray photoelectron spectroscopy studies show the removal of conductive OH layer from the surface of ZnO films and the current–voltage characteristics of Au–ZnO–In junction exhibit the rectifying behaviour after oxygen plasma treatment. The fabricated Au–ZnO–Au ultraviolet (UV) detector was successfully tested and was observed to be sensitive to the two UV sources used. The photoresponsivities of the UV detector for the irradiation of two different power densities 350 (λ = 356 nm) and 420 µW cm<SUP>−2</SUP> (λ = 254 nm) are 13.5 A W<SUP>−1</SUP>, 15.3 A W<SUP>−1</SUP> at 5 V and 128.9 A W<SUP>−1</SUP>, 160 A W<SUP>−1</SUP> at 10 V, respectively.</P>
Development and evaluation of psyllium seed husk polysaccharide based wound dressing films
Patil, Basavaraj S.,Mastiholimath, Vinayak S.,Kulkarni, Anandrao R. 경희한의학연구센터 2011 Oriental Pharmacy and Experimental Medicine Vol.11 No.2
In the present study, wound dressing films were fabricated using Seed Husk of Psyllium (SHP) complexed with povidone iodine and were evaluated for various physicochemical properties as well as wound healing activity in albino rats. The required film properties for the successful wound dressings, such as film elongation (elasticity), tensile strength, water uptake and water vapor transmission rates (WVTR) were examined. Results indicated that SHP films showed good elasticity (80.27-116.24%) and acceptable tensile strengths (8.33-22.13 N/$^mm2$). SHP films were evaluated for water absorption pattern as well as permeation to water vapours and results showed that films were able to swell in water upto 167 to 191% w/w and WVTR were in the range between $8.23{\times}10^{-3}$ to $1.12{\times}10^{-4}g.cm^2/day$. Selected formulation of SHP films with optimum characteristics were loaded with Povidone iodine (PI) solution by soaking method and were evaluated for antimicrobial and wound healing activity on excision wound model. Results indicated that PI loaded films showed significant antibacterial activity against both gram positive and gram negative selected bacteria. PI loaded SHP films showed comparatively better wound healing property to control group with faster epithelialization and greater rates of wound contraction.
Experimental Investigation on Absorption Performance of Nanofluids for CO2 Capture
Devakki Basavaraj,Thomas Shijo 대한설비공학회 2020 International Journal Of Air-Conditioning and Refr Vol.28 No.2
Lately, absorption of carbon dioxide using nanofluids has gained more attention as this acidic gas creates global warming effect. The absorption test was conducted in a custom designed high-pressure vessel made up of stainless steel 316 L, where CO2 and nanofluid are in direct contact at static state. The type of nanoparticles and influence of its concentration on absorption of carbon dioxide are analyzed. TiO2 and Al2O3 nanofluids at 0.02–0.14wt.% concentrations are prepared by dispersing in DI water. The CO2 absorption tests were carried out for the above-mentioned nanofluids at said concentrations with operating conditions being an initial pressure of 3 bar and initial temperature of 302K. The results show that relative absorption index (RAI) of CO2 absorption has increased to a maximum and then decreased with increase in nanoparticle concentration. The aqueous-based TiO2, Al2O3 nanofluids are found to be most effective at 0.1 and 0.14wt.%, respectively, with RAI showing 39.81% and 22.3% increase in CO2 absorption as compared to basefluid, respectively. The absorption test has also been conducted for saline-based TiO2 and Al2O3 nanofluids at 1, 2, 3 and 3.1wt.% of salt concentration. The stability of saline-based nanofluids was analyzed using turbidity meter. It was found that increase in salt concentration decreases the stability of nanofluids and also decreases the CO2 absorption rate because of unstability of nanoparticles in salt solutions. Absorption decreased by 11.93% for TiO2, and 5.68% for Al2O3, when salt concentration was increased from 1 to 3.1wt.%.