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Arumugam, Nandhini,Kim, JongSung Elsevier 2018 Materials science & engineering. C, Materials for Vol.92 No.-
<P><B>Abstract</B></P> <P>Water-soluble fluorescent carboxyl-functionalized CdSe-ZnS quantum dots (QDs) were immobilized on graphene oxide (GO) and used for sensitive detection of ascorbic acid in aqueous solutions. QDs were attached to the surface of graphene oxide using the EDC/NHS-sulfo coupling reaction. Ascorbic acid is known as an antioxidant. It plays a crucial role in health maintenance, bio synthetic pathways such as formation of collagen and regulates immune system. The photoluminescence (PL) intensity of as-prepared GO-QD hybrids in water was quenched by ascorbic acid at ambient temperature. Based on this photoluminescence quenching phenomenon, a simple, rapid, and sensitive procedure is developed. In this study we are successful in detecting ascorbic acid due to its biological significance and the limit of detection is 568 pM.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Sensing platform based on quantum dots attached to graphene oxide (GO) was established. </LI> <LI> The preparation of GO-QD hybrids is simple and inexpensive. </LI> <LI> As-prepared GO-QD hybrids are successful in detecting ascorbic acid. </LI> <LI> Simple and sensitive detection of ascorbic acid at picomolar level </LI> </UL> </P>
( Arumugam Sekar ),김상훈,이석,라현욱,한윤봉 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
Catalysts free ZnO nanowires were grown on Si (100) substrates using rapid thermal chemical vapour deposition (RTCVD) at various growth conditions using metallic Zn powder as the source material. Further examinations of the growth conditions of ZnO nanowires observed in electron microscopy implied that the ZnO nanowire growth was favoured by high flow rate of oxygen gas supply and high growth temperature (Tg = 600 C). The structural, surface morphology and optical properties of ZnO nanowires were systematically investigated by means of x-ray diffraction, Field Emission Scanning Electron Microscope (FE-SEM) and Photoluminescence (PL) respectively. Photoluminescence spectroscopy showed that nanowires have better optical qualities. These results indicate that one can obtain ZnO nanowires by selecting the growth temperature and oxygen flow rate.
The Impact of Property Management Services on Tenants’ Satisfaction with Industrial Buildings
Arumugam Seetharaman,A. S. Saravanan,Nitin Patwa,Jiann Ming Bey 한국유통과학회 2017 The Journal of Asian Finance, Economics and Busine Vol.4 No.3
In the current competitive marketplace of real estate business, tenant satisfaction measurement is one of the important indicators to monitor competitiveness in industrial property development. It has become an industry standard to measure tenant satisfaction, commonly called customer satisfaction. Customer satisfaction has become the widely used metric to manage customer loyalty (Keiningham, Gupta, Aksoy, & Buoye, 2014). The aim of this research is to determine the impact of property management services on tenants’ satisfaction with the three identified variables i.e. facility management, perceived quality and lease management. Structural equation modeling (SEM) is applied to build constructs and test the hypotheses with the collected survey samples. Of the three variables, facility management is the most influential factor that leads to tenant satisfaction with industrial buildings. Next, perceived quality is another important factor that contributes to tenants’ pleasure. Compared with these two, lease management fares worse, having the least extensive effect on tenant satisfaction, and could be disregarded. The ultimate impact of tenant satisfaction is about tenant retention and recommendation. The overall findings of this research will potentially help real estate developers to develop a better property management system, leasing program and tenant retention strategy.
Arumugam, P.,Samson, A.,Ki, J.,Song, J. M. Springer Science + Business Media 2017 Cell biology and toxicology Vol.33 No.3
<P>The existence of a well-established drug resistance mechanism in cancer stem cells (CSC) complicates the cancer treatment. Clusterin (CLU) plays a key role in maintaining the integrity of endoplasmic reticulum (ER) during drug-induced stress. Hence, silencing the CLU could significantly reduce the inherent drug resistance mechanism of CSC. The combination of drug-induced cytotoxicity, as well as the suppression of drug resistance in CSC, could circumvent the recurrence capability of the tumor. In the present study, camptothecin (CPT)-induced apoptosis and necrosis in CSC with and without siCLU treatment were simultaneously measured using Qdot-based total internal reflection fluorescence microscope (TIRF). In addition, to elucidate the mechanism of CPT-induced cytotoxicity in CLU-suppressed CSC, expression of Bcl-2, Bax, Bak, and PARP and mitochondrial permeability transition pore (MPTP) were studied. EC50 values of CPT-induced apoptosis and necrosis were significantly reduced (p < 0.01) in CLU-suppressed MCF-7 and CSC. Significantly increased MPTP (p < 0.001) and cytosolic Ca2+ (p < 0.001) were observed in CPT-treated CLU-suppressed CSC as compared to the normal CSC. Elevated expression of Bax, Bak, and cleaved PARP and reduced expression of Bcl-2 and cytosolic ATP were observed in CPT-treated CLU-suppressed CSC. Observed results indicate that silencing the expression of CLU could improve the anticancer efficacy of CPT at 128.4-nM concentration by equally inducing necrotic signals along with apoptosis. Furthermore, the developed high content TIRF assay based on the CLU-suppressed CSC could be an ideal and beneficial tool for rapidly analyzing the cytotoxicity of anti-cancer agents.</P>
Arumugam, Sivaprakasam,Thathan, Manigandan The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.6
The Direct Torque Control (DTC) technique for Permanent Magnet Synchronous Motors (PMSM) is receiving increased attention due to its simplicity and robust dynamic response when compared with other control techniques. The classical switching table based DTC results in large flux and torque ripples in the motors. Several studies have been reported in the literature on classical DTC. However, there are only limited studies that actually discuss or evaluate the classical DTC. This paper proposes, novel switching table / DTC methods for PMSMs to reduce torque ripples. In this paper, two DTC schemes are proposed. The six sector and twelve sector methodology is considered in DTC scheme I and DTC scheme II, respectively. In both DTC schemes a simple modification is made to the classical DTC structure. The two level inverter available in the classical DTC is eliminated by replacing it with a three level Neutral Point Clamped (NPC) inverter. To further improve the performance of the proposed DTC scheme I, the available 27 voltage vectors are allowed to form different groups of voltage vectors such as Large - Zero (LZ), Medium - Zero (MZ) and Small - Zero (SZ), where as in DTC scheme II, all of the voltage vectors are considered to form a switching table. Based on these groups, a novel switching table is proposed. The proposed DTC schemes are comparatively investigated with the classical DTC and existing literatures through theory analysis and computer simulations. The superiority of the proposed DTC method is also confirmed by experimental results. It can be observed that the proposed techniques can significantly reduces the torque ripples and improves the quality of current waveform when compared with traditional and existing methods.
Arumugam Jayamani,Vijayan Thamilarasan,Venketasan Ganesan,Nallathambi Sengottuvelan 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.12
A nickel(II) complex [Ni(H2biim)2(H2O)2](ClO4)2·H2O (1) of biimidazole ligand has been synthesized and characterized (Where H2biim = 2,2'-biimidazole). The single crystal X-ray diffraction of the complex shows a dimeric structure with six coordinated psudo-octahedral geometry. The cyclic voltammograms of complex exhibited one quasireversible reduction wave (Epc = −0.61 V) and an irreversible oxidation wave (Epa = 1.28 V) in DMF solution. The interaction of the complex with Calf-Thymus DNA (CT-DNA) has been investigated by absorption and fluorescence spectroscopy. The complex is an avid DNA binder with a binding constant value of 1.03 × 105 M−1. The results suggest that the nickel(II) complex bind to CT-DNA via intercalative mode and can quench the fluorescence intensity of EB bind to CT-DNA with Kapp value of 3.2 × 105 M−1. The complex also shown efficient oxidative cleavage of supercoiled pBR322 DNA in the presence of hydrogen peroxide as oxidizing agent. The DNA cleavage by complex in presence of quenchers; viz. DMSO, KI, NaN3 and EDTA reveals that hydroxyl radical or singlet oxygen mechanism is involved. The complex showed invitro antimicrobial activity against four bacteria and two fungi. The antimicrobial activity was nearer to that of standard drugs and greater than that of the free ligand.
Growth of Bulk Single Crystals of Urea for Photonic Applications
Arumugam Saranraj,Sathiyadhas Sahaya Jude Dhas,Michael Jose,Sathiyadhas Amalapusham Martin Britto Dhas 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.1
We report the growth of technologically important urea crystals of record size (48 ×16 × 8 mm3) by doping sulfuric acid and employing slow evaporation technique. Thegrown crystal was identified by single crystal X-Ray diffraction and FTIR spectralanalysis. Optical properties of the grown crystal were analyzed by UV-Vis spectrumand the presence of H2SO4 was confirmed by EDAX analysis. Thermogravimetricanalysis, Differential Scanning Calorimetry and Photo acoustic studies were alsocarried out to determine the thermal properties of the grown crystal. The dielectricproperties for wide range of frequencies (1 Hz to 1 MHz) at different temperatures(35, 40, 60, 80, 100 °C) were analyzed. The second harmonic conversion efficiencyof the grown H2SO4 doped urea crystal was found to be 3.75 times higher than thecommercially available KDP crystals.