Comparative kinetic study of functionalized carbon nanotubes and magnetic biochar for removal of Cd2+ ions from wastewater

Manimaran Ruthiraan,Nabisab Mujawar Mubarak,Raj Kogiladas Thines,Ezzat Chan Abdullah,Jaya Narayan Sahu,Natesan Subramanian Jayakumar,Poobalan Ganesan 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.3

We did a comparative study between functionalized multiwall carbon nanotube (FMWCNTs), and magneticbiochar was carried out to determine the most efficient adsorbent to be employed in the Cd2+ ion removal. Weoptimized parameters such as agitation speed, contact time, pH and adsorbent dosage using design expert vrsion 6.08. The statistical analysis reveals that optimized condition for highest removal of Cd2+ are at pH 5.0, with dosage 1.0 g,agitation speed and contact time of 100 rpm and 90 minutes, respectively. For the initial concentration of 10mg/l, theremoval efficiency of Cd2+ using FMWCNTs was 90% and and 82% of magnetic biochar. The maximum Cd2+ adsorptioncapacities of both FMWCNTs and magnetic biochar were calculated: 83.33mg/g and 62.5mg/g. The Langmuirand Freundlich constants for FMWCNTs were 0.056 L/mg and 13.613 L/mg, while 0.098 L/mg and 25.204 L/mg formagnetic biochar. The statistical analysis proved that FMWCNTs have better adsorption capacity compared to magneticbiochar and both models obeyed the pseudo-second-order.

A new framework for Person Re-identification: Integrated level feature pattern (ILEP)

( V. Manimaran ),( K. G. Srinivasagan ),( S. Gokul ),( I. Jeena Jacob ),( S. Baburenagarajan ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.12

The system for re-identifying persons is used to find and verify the persons crossing through different spots using various cameras. Much research has been done to re-identify the person by utilising features with deep-learned or hand-crafted information. Deep learning techniques segregate and analyse the features of their layers in various forms, and the output is complex feature vectors. This paper proposes a distinctive framework called Integrated Level Feature Pattern (ILFP) framework, which integrates local and global features. A new deep learning architecture named modified XceptionNet (m-XceptionNet) is also proposed in this work, which extracts the global features effectively with lesser complexity. The proposed framework gives better performance in Rank1 metric for Market1501 (96.15%), CUHK03 (82.29%) and the newly created NEC01 (96.66%) datasets than the existing works. The mean Average Precision (mAP) calculated using the proposed framework gives 92%, 85% and 98%, respectively, for the same datasets.

Chemical Composition and Antimicrobial Activity of Cone Volatile oilof Cupressus macrocarpa Hartwig from Nilgiris, India

S.Manimaran,S.Themozhi,M.J.Nanjan,B. Suresh 한국생약학회 2007 Natural Product Sciences Vol.13 No.4

aim of the present study was to investigate the various chemical components present in the conevolatile oil of Cupresus macrocarpa and also determine its antimicrobial activity. Totally 13 compounds wereidentified with 99.99% by GC-MS analysis. The major compounds identified were terpinene-4-ol (19.42%),dinopol (15.63%), α-pinene (13.58%), and β-pinene (12.16%). The antimicrobial activity was carried out for theorganisms used were Bacillus subtilis, Staphylococcus aureus, Bacillus megaterium, and Bacillus cogulans. Thegram negative organisms used were Escherichia coli, Kleibseilla pneumonia, Pseudomonas aeruginosa andSalmonella typhi. In vitro antifungal studies were also carried out by using organisms, Candida albicans,Aspergillus flavus, Trichoderma lignorum and Cryptococcus neoformans. The standard drugs used were penicillinbacteria and fungi respectively. Both oil and cream formulation showed good activity against fungi than bacteria.This study is being reported for the first time on cone volatile oil of this plant. KeywordsVolatile oil, antimicrobial, terpinene-4-ol, dinopol, α and β-pinene, Cupressus macrocarpa.

Sustained hydrogen production from formate using immobilized recombinant Escherichia coli SH5

Seol, E.,Manimaran, A.,Jang, Y.,Kim, S.,Oh, Y.K.,Park, S. Pergamon Press ; Elsevier Science Ltd 2011 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.36 No.14

Biohydrogen is an ideal energy carrier for mobile chemical fuel cells, but its use is often limited by unavailability of sustained H<SUB>2</SUB> production system(s). Here, we developed a compact system for H<SUB>2</SUB> production from formate based on immobilized cells of recombinant Escherichia coli SH5. Three different matrices were tested as immobilization medium, among which agar showed the best performance in mechanical stability and permeability of substrate(s) and/or gaseous products (H<SUB>2</SUB> and CO<SUB>2</SUB>). To explore and optimize the H<SUB>2</SUB> production capability of the immobilized cells, the conditions for cell immobilization including cell loading and agar concentration as well as the factors affecting H<SUB>2</SUB> production rate such as temperature, pH, and substrate concentration were studied in detail. A maximum volumetric production rate of 2.4 L H<SUB>2</SUB> L<SUP>-1</SUP> h<SUP>-1</SUP> was obtained when the immobilized cells were incubated with 350 mM sodium formate at pH 6.5 and 37 <SUP>o</SUP>C. Periodic supplementation of 200 mM formate with 20 mM glucose at pH 6.5 maintained the high H<SUB>2</SUB> production rate for a prolonged period of 10 h. We believe that our process can be developed for sustained H<SUB>2</SUB> production and is applicable to the operation of fuel cells in small-scale.

Implementation of a Sliding Mode Controller for Single Ended Primary Inductor Converter

Subramanian, Venkatanarayanan,Manimaran, Saravanan The Korean Institute of Power Electronics 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.1

This paper presents the regulation of the output voltage and inductor currents in a Single Ended Primary Inductor Converter (SEPIC), operating in the continuous conduction mode (CCM) using a sliding mode controller. Owing to the time varying nature of the SEPIC converter, designing a feedback controller is a challenging task. In order to improve the dynamic performance of the SEPIC, a Sliding Mode Controller (SMC) is developed. The developed SMC is designed by using a state space average model. The performance of the developed controller with the SEPIC converter is validated at different working conditions through Matlab simulations. It is also compared with the performance while using a PI controller. The results show that the designed controller gives very good output voltage regulation under different operating conditions such as a varying input voltage, changes in the load and component variations. A 48V, 46W experimental setup for has been developed in an analog platform to validate the performance of the proposed SMC.

Design of Parallel-Operated SEPIC Converters Using Coupled Inductor for Load-Sharing

Subramanian, Venkatanarayanan,Manimaran, Saravanan The Korean Institute of Power Electronics 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.2

This study discusses the design of a parallel-operated DC-DC single-ended primary-inductor converter (SEPIC) for low-voltage application and current sharing with a constant output voltage. A coupled inductor is used for parallel-connected SEPIC topology. Generally, two separate inductors require different ripple currents, but a coupled inductor has the advantage of using the same ripple current. Furthermore, tightly coupled inductors require only half of the ripple current that separate inductors use. In this proposed work, tightly coupled inductors are used. These produce an output that is more efficient than that from separate inductors. Two SEPICs are also connected in parallel using the coupled inductors with a single common controller. An analog control circuit is designed to generate pulse width modulation (PWM) signals and to fulfill the closed-loop control function. A stable output current-sharing strategy is proposed in this system. An experimental setup is developed for a 18.5 V, 60 W parallel SEPIC (PSEPIC) converter, and the results are verified. Results indicate that the PSEPIC provides good response for the variation of input voltage and sudden change in load.

Implementation of a Sliding Mode Controller for Single Ended Primary Inductor Converter

Venkatanarayanan Subramanian,Saravanan Manimaran 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.1

This paper presents the regulation of the output voltage and inductor currents in a Single Ended Primary Inductor Converter (SEPIC), operating in the continuous conduction mode (CCM) using a sliding mode controller. Owing to the time varying nature of the SEPIC converter, designing a feedback controller is a challenging task. In order to improve the dynamic performance of the SEPIC, a Sliding Mode Controller (SMC) is developed. The developed SMC is designed by using a state space average model. The performance of the developed controller with the SEPIC converter is validated at different working conditions through Matlab simulations. It is also compared with the performance while using a PI controller. The results show that the designed controller gives very good output voltage regulation under different operating conditions such as a varying input voltage, changes in the load and component variations. A 48V, 46W experimental setup for has been developed in an analog platform to validate the performance of the proposed SMC.

Design of Parallel-Operated SEPIC Converters Using Coupled Inductor for Load-Sharing

Venkatanarayanan Subramanian,Saravanan Manimaran 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.2

This study discusses the design of a parallel-operated DC-DC single-ended primary-inductor converter (SEPIC) for low-voltage application and current sharing with a constant output voltage. A coupled inductor is used for parallel-connected SEPIC topology. Generally, two separate inductors require different ripple currents, but a coupled inductor has the advantage of using the same ripple current. Furthermore, tightly coupled inductors require only half of the ripple current that separate inductors use. In this proposed work, tightly coupled inductors are used. These produce an output that is more efficient than that from separate inductors. Two SEPICs are also connected in parallel using the coupled inductors with a single common controller. An analog control circuit is designed to generate pulse width modulation (PWM) signals and to fulfill the closed-loop control function. A stable output current-sharing strategy is proposed in this system. An experimental setup is developed for a 18.5 V, 60 W parallel SEPIC (PSEPIC) converter, and the results are verified. Results indicate that the PSEPIC provides good response for the variation of input voltage and sudden change in load.

Grinding titanium Ti-6Al-4V alloy with electroplated cubic boron nitride wheel under cryogenic cooling

Elanchezhian J.,Pradeep Kumar. M,Manimaran G. 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.11

A grinding experiment was conducted with Ti-6Al-4V alloy in a wet and cryogenic coolant environment. An electroplated cubic boronnitride grinding wheel was used for this experiment. The input process parameters that were considered were depth of cut and nozzleinclination angle. The output response parameters that were considered were tangential forces, normal forces, grinding zone temperature,specific energy, and surface roughness (Ra). Experimental results indicate an 8% to 27% reduction in tangential force and 3% to 12%reduction in normal force when liquid nitrogen was used as coolant. Ra is reduced by a maximum of 38% over wet grinding, and grindingzone temperature is reduced by up to 55%. Surface modification and chip morphology were analyzed. Experimental results indicated thatthe nozzle angle at 45o has a significant effect on the grinding process.

Saffron Reduction of 7,12-Dimethylbenz[a]anthracene-induced Hamster Buccal Pouch Carcinogenesis

Manoharan, Shanmugam,Wani, Shamsul Afaq,Vasudevan, Krishnamoorthy,Manimaran, Asokan,Prabhakar, Murugaraj Manoj,Karthikeyan, Sekar,Rajasekaran, Duraisamy Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.2

Our aim was to investigate the chemopreventive potential of saffron in DMBA-induced hamster buccal pouch carcinogenesis. Assessment was by monitoring the percentage of tumor bearing hamsters, tumor size as well as the status of detoxification agents, lipid peroxidation and antioxidants. Oral squamous cell carcinomas were induced in the buccal pouch of Syrian golden hamsters by painting them with 0.5% DMBA in liquid paraffin three times a week for 14 weeks. We observed 100% oral tumor formation with severe histopathological abnormalities in all the hamsters treated with DMBA alone, activities of phase I and phase II detoxification enzymes, lipid peroxidation and antioxidants being significantly altered. Though oral administration of saffron completely prevented the formation of tumors, we noticed severe hyperplasia and dysplasia in hamsters treated with DMBA, suggesting that tumors might eventually develop. Oral administration of saffron return detoxification enzymes, lipid peroxidation and antioxidants to normal ranges. The chemopreventive potential of saffron thus is likely due to antioxidant properties and modulating effects on detoxification in favour of the excretion of carcinogenic metabolites during DMBA-induced hamster buccal pouch carcinogenesis.