Initial Maclaurin Coefficient Bounds for New Subclasses of Analytic and m-Fold Symmetric Bi-Univalent Functions Defined by a Linear Combination

Srivastava, Hari M.,Wanas, Abbas Kareem Department of Mathematics 2019 Kyungpook mathematical journal Vol.59 No.3

In the present investigation, we define two new subclasses of analytic and m-fold symmetric bi-univalent functions defined by a linear combination in the open unit disk U. Furthermore, for functions in each of the subclasses introduced here, we establish upper bounds for the initial coefficients ${\mid}a_{m+1}{\mid}$ and ${\mid}a_{2m+1}{\mid}$. Also, we indicate certain special cases for our results.

Microcredit for rural poverty alleviation and social well-being: A study of Sabah, Malaysia

Haris Abd. Wahab,William Bunyau,M. Rezaul Islam 한국사회복지학회 2018 Asian Social Work and Policy Review Vol.12 No.1

Microcredit is an influential intervention used to alleviate poverty and improve social well-being in rural communities in Sabah, Malaysia. This study examined the effects of a microcredit scheme, Amanah Ikhtiar Malaysia (AIM), on the well-being of these communities. Using a survey method, a pre-tested interview schedule was administered to 277 AIM recipients in Sabah, Malaysia. Social well-being was examined based on the three indicators of Midgley’s social development approach: the management of problems, the fulfillment of basic needs, and social opportunities provided. AIM microcredit schemes were successful in improving the well-being of AIM recipients, although the recipients faced a number of problems, including unemployment, lack of education, and access to public services and healthcare facilities. The findings of this study represent a useful guideline to the AIM authority, development practitioners, policymakers, and governmental organization and nongovernmental organization workers

Current-driven Domain Wall Motion in Artificial Magnetic Domain Structures

M. Hari,K. Wang,S. J. Bending,E. Arac,D. Atkinson,S. Lepadatu,J. S. Claydon,C. H. Marrows 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10

We report progress towards optimisation of artificial magnetic domain structures for efficient spin transfer torque domain wall (DW) motion. Co/Pt multilayer samples have been sputtered on (100)Si/SiO2 substrates and perpendicular magnetic anisotropy confirmed using polar magneto-optical Kerr effect (MOKE) measurements. The influence of the thickness of Co and Pt layers on the coercivity and switching behaviour was systematically investigated and the conditions established for realising well-suited structures with medium coercivity (∼100 Oe) and sharp switching fields. Optimised Co/Pt multilayer films have been lithographically patterned into nanowire devices for time-resolved extraordinary Hall effect (EHE) measurements. Our devices are based on 50 Ω coplanar waveguides incorporating single and double Hall cross structures. The coercivity of the region surrounding the Co/Pt Hall crosses was reduced by local focussed ion beam (FIB) irradiation allowing the controlled nucleation of domain walls at the edges of these regions by application of an appropriate field sequence. We describe polar MOKE experiments that show how DC currents lead to asymmetric switching of these artificial domains due to current-assisted DW motion across them.

Study of stainless steel electrodes after electrochemical analysis in sea water condition

Kovendhan, M.,Kang, Hari,Jeong, Sangmin,Youn, Jong-Sang,Oh, Inhwan,Park, Young-Kwon,Jeon, Ki-Joon Academic Press 2019 Environmental research Vol.173 No.-

<P><B>Abstract</B></P> <P>For water electrolysis, a rare earth material (eg., platinum) is often used as an electrode, but because of the high cost and toxicity of chemicals, researchers are searching for cost effective and eco-friendly alternative materials. Various alloys and metals have been long explored for use as electrode materials in different media. Stainless steel (SS 304) electrodes are cost effective and have a large surface area; further their catalytic performance is comparable to that of carbon coated noble metals cathodes. Stainless steel has good mechanical properties and durability so it is widely used in desalination plants, oil and gas industries, ship building, etc. However, over a period of time it corrodes very quickly in saline water. To improve the stability and durability of the electrodes (i.e., to minimize corrosion), we anneal the samples under two different sets of conditions and test the electrodes in 3.5% NaCl solution. The anodic peak (−0.25 V) observed for bare stainless steel result from the formation of iron (II) hydroxide [Fe(OH)<SUB>2</SUB>]. The Raman bands observed at 210 and 274 cm<SUP>−1</SUP> for bare stainless steel result from the formation of α-Fe<SUB>2</SUB>O<SUB>3</SUB> owing to partial, anodic, and cathodic reactions occurring on the electrode which disrupts the surface layers. High intensity X-ray diffraction (XRD) and Raman peaks of Cr<SUB>2</SUB>O<SUB>3</SUB> and MnCr<SUB>2</SUB>O<SUB>4</SUB> observed in argon and hydrogen annealed sample after cyclic voltammetry reveal that this sample is more stable than bare and air annealed samples. XRD reveals mixed oxide phases in addition to eskolaite and magnetite phases. Scanning electron microscope (SEM) images show that although the air-annealed sample has a soft, spongy structure, Na and Cl ions are adsorbed in the voids on the outer surface of the electrode leading to quick degradation. For the air-annealed sample the oxide appears to adhere poorly to the stainless steel. Oxygen (ie., oxide composition) may play a key role in adherence and growth of Cr<SUB>2</SUB>O<SUB>3</SUB> formed at high temperature. X-ray photoelectron spectroscopy (XPS) reveals that large amounts of Cr and Mn are dissolved/corroded into the electrolyte for air annealed sample which is in good agreement with the Raman and SEM results.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The anodic peak (−0.25 V) observed in bare stainless steel (BS) is due to the formation of iron (II) hydroxide (Fe(OH)<SUB>2</SUB>). </LI> <LI> For bare stainless steel due to NaCl adsorption elongation of a large number of pits and patches was observed from SEM image. </LI> <LI> Air Annealed sample corrodes very quickly due to the presence of high amount of oxygen. </LI> <LI> XRD and Raman confirmed the sample annealed in “argon and hydrogen” environment is highly stable. </LI> <LI> The adsorption intensity of NaCl decreased and follows the trend RE > AA sample. </LI> </UL> </P>

Performance Evaluation of Multi-hop Relaying over Non-Gaussian PLC Channels

Khaled M. Rabie,Bamidele Adebisi,Haris Gacanin,Galymzhan Nauryzbayev University,Augustine Ikpehai 한국통신학회 2017 Journal of communications and networks Vol.19 No.5

Relaying over power line communication (PLC) channelscan considerably enhance the performance and reliability ofPLC systems. This paper is dedicated to study and analyze theenergy efficiency of multi-hop cooperative relaying PLC systems. Incremental decode-and-forward (IDF) relying is exploited to reducethe transmit power consumption. The PLC channel is assumedto experience log-normal fading with impulsive noise. Theperformances of single-hop and conventional DF relaying systemsare also analyzed in terms of outage probability and energy efficiencyfor which analytical expressions are derived. Results showthat using more relays can improve the outage probability performance;however, this is achieved at the expense of increased powerconsumption due to the increased static power of the relays, especiallywhen the total source-to-destination distance is relativelysmall. Results also demonstrate that the IDF PLC system has betterenergy efficiency performance compared to the other schemes.

Molecular Characterisation of Nilagiri Sheep (Ovis aries) of South India Based on Microsatellites

Girish, Haris,Sivaselvam, S.N.,Karthickeyan, S.M.K.,Saravanan, R. Asian Australasian Association of Animal Productio 2007 Animal Bioscience Vol.20 No.5

Genetic variation in Nilagiri sheep, the only apparel wool breed in South India was studied using 25 FAO recommended ovine-specific microsatellite markers. The number of observed alleles ranged from 3 to 8 with a mean of 5 across all loci. The size of alleles ranged from 72 to 228 bp. The frequency of alleles ranged from 0.0104 to 0.5781. In total, 125 alleles were observed at the 25 loci studied. The effective number of alleles ranged from 2.18 to 6.49. The mean number of effective alleles was 3.84 across all loci. All the 25 loci were found to be highly polymorphic. The PIC values ranged from 0.4587 to 0.8277 with a mean of 0.6485. Of 25 microsatellites studied, 17 were in Hardy-Weinberg Equilibrium proportions. The observed heterozygosity ranged from 0.4222 to 1.000 with a mean value of 0.7610 whereas the expected heterozygosity ranged from 0.5415 to 0.8459 with a mean value of 0.7213. Except six loci, the other loci revealed negative within-population inbreeding estimates (FIS) indicating excess of heterozygotes in the population of Nilagiri sheep.

<i>Duganella</i> <i>sacchari</i> sp. nov. and <i>Duganella</i> <i>radicis</i> sp. nov., two novel species isolated from rhizosphere of field-grown sugar cane

Madhaiyan, M.,Poonguzhali, S.,Saravanan, V. S.,Hari, K.,Lee, K.-C.,Lee, J.-S. International Union of Microbiological Societies 2013 International journal of systematic and evolutiona Vol.63 No.3

<P>Two strains, designated Sac-22<SUP>T</SUP> and Sac-41<SUP>T</SUP>, were isolated from rhizosphere soil and rhizoplane of field-grown sugar cane clone Co86032. Comparative 16S rRNA gene sequence analysis showed a clear affiliation of these two bacteria with the class <I>Betaproteobacteria</I>, their closest relatives being <I>Pseudoduganella violaceinigra</I> and <I>Duganella zoogloeoides</I> with 16S rRNA gene sequence pairwise similarities of 96.4–97.2 % to the two novel strains. Strains Sac-22<SUP>T</SUP> and Sac-41<SUP>T</SUP> shared a 16S rRNA gene sequence similarity value of 97.6 %. Cells of the two strains were Gram-reaction-negative, aerobic, motile and rod-shaped. Ubiquinone (Q-8) was the respiratory quinone and the predominant polar lipids consisted of phosphatidylglycerol and phosphatidylethanolamine. The main cellular fatty acids were C<SUB>16 : 0</SUB>, C<SUB>16 : 1</SUB>ω7<I>c</I>/iso-C<SUB>15 : 0</SUB> 2-OH, C<SUB>17 : 0</SUB> cyclo, C<SUB>10 : 0</SUB> 3-OH and C<SUB>12 : 0</SUB>. The DNA G<I>+</I>C content of the genomic DNA was 56.4 mol% for strain Sac-22<SUP>T</SUP> and 54.9 mol% for strain Sac-41<SUP>T</SUP>. Based on the results of 16S rRNA gene sequence analysis and physiological and biochemical characterization, that differentiated strains Sac-22<SUP>T</SUP> and Sac-41<SUP>T</SUP> from all recognized species of the genus <I>Duganella</I>, it was concluded that strains represent two novel species in the genus <I>Duganella</I> for which the names <I>Duganella</I> <I>sacchari</I> sp. nov. (type strain Sac-22<SUP>T</SUP> = KCTC 22381<SUP>T</SUP> = NCIMB 14475<SUP>T</SUP>) and <I>Duganella</I> <I>radicis</I> sp. nov. (type strain Sac-41<SUP>T</SUP> = KCTC 22382<SUP>T</SUP> = NCIMB 14476<SUP>T</SUP>) are proposed.</P>

Role of Transesophageal Echocardiography in the Diagnosis of Paradoxical Low Flow, Low Gradient Severe Aortic Stenosis

Muaz M. Abudiab,Anil Pandit,Hari P. Chaliki 대한심장학회 2017 Korean Circulation Journal Vol.47 No.1

Background and Objectives: Prior studies indicate that up to 35% of cases of severe aortic stenosis (AS) have paradoxical low flow, low gradient despite preserved left ventricular ejection fraction (LVEF). However, error in left ventricular outflow tract (LVOT) diameter may lead to misclassification. Herein, we determined whether measurement of LVOT diameter by transesophageal echocardiography (TEE) results in reclassification of cases to non-severe AS. Subjects and Methods: Patients with severe AS with aortic valve area (AVA) <1 cm2 by transthoracic echocardiography (TTE) within 6 months were studied. Paradoxical low flow, low gradient was defined as mean Doppler gradient (MG) <40 mm Hg and stroke volume index (SVI) ≤35 mL/m2. Preserved LVEF was defined as ≥0.50. Results: Among 108 patients, 12 (15%) had paradoxical low flow, low gradient severe AS despite preserved LVEF based on TTE measurement. When LVOT diameter by TEE in 2D was used, only 5 (6.3%) patients had low flow, low gradient severe AS (p<0.001). Coefficients of variability for intraobserver and interobserver measurement of LVOT were <10%. However, the limits of agreement between TTE and TEE measurement of LVOT ranged from 0.43 cm (95% confidence interval [CI]: 0.36 to 0.5) to -0.31 cm (95% CI: -0.38 to -0.23). Conclusion: TEE measured LVOT diameter may result in reclassification to moderate AS in some patients due to low prevalence of true paradoxical low flow, low gradient (PLFLG) severe AS.

Alternative cost-effective electrodes for hydrogen production in saline water condition

Kovendhan, M.,Kang, Hari,Youn, Jong Sang,Cho, Hyunwook,Jeon, Ki-Joon Elsevier 2019 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.44 No.11

<P><B>Abstract</B></P> <P>For the sustainable clean and green energy, hydrogen is considered as one of the prominent renewable energy source which attracted increasing interests in recent years. To produce this, one of the cheapest method is water electrolysis. But several challenges in water electrolysis are, to reduce the maintenance cost, energy consumption and high cost of platinum electrode material. So, in search of an alternative low cost and efficient electrode material, researchers are modifying various metals electrodes to replace the noble metal electrodes. Stainless steel (SS 304) is one of the types of carbon steel material commonly used for various applications. The aim of the work is to explore the stainless steel (SS 304), annealed at high temperature, with and without “hydrogen and argon” environment and tested the samples for hydrogen production in sea water condition (3.5% NaCl). Cr<SUB>2</SUB>O<SUB>3</SUB> and MnCr<SUB>2</SUB>O<SUB>4</SUB> spinel oxide formation was observed over the surface of the electrodes after annealing process. From Raman, X-ray Photoelectron Spectroscopy (XPS) and electrochemical measurements it was observed that, the sample prepared under hydrogen and argon environment is stable when compared with the rest of the samples. Decrease in relative amount of chromium oxide was observed for the sample annealed in air environment. The rate of production of hydrogen prepared under “hydrogen and argon” environment is higher and the results are discussed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Raman peaks at 550 cm<SUP>−1</SUP> and 640 cm<SUP>−1</SUP> for annealed sample, belongs to Cr<SUB>2</SUB>O<SUB>3</SUB> and MnCr<SUB>2</SUB>O<SUB>4</SUB> spinel respectively. </LI> <LI> Disordered hexagonal shaped, non-uniform, twisted oxide grain growth with pores and defects are observed. </LI> <LI> The Mn in the presence of oxygen supresses the growth of Cr<SUB>2</SUB>O<SUB>3</SUB> in the case of air annealed sample. </LI> <LI> The “H<SUB>2</SUB> and Ar” annealed sample looks highly stable and produces more hydrogen when compared with the rest. </LI> </UL> </P>

Study on the Effect of Nitrogen-Ion Implantation in Semi-Insulating InP by Using Scanning Tunneling Microscopy

Jayavel, P.,Haris, M.,Hayakawa, Y.,Santhakumar, K.,Lee, C. R.,Soga, T.,Asokan, K. Korean Physical Society 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2