Investigation of Ionic Transport Through Track-Etched Conical Nanopores of PET Membrane

Sushil Kumar,Rajesh Kumar,Sushil Kumar,Narinder Kumar,S. K. Chakarvarti 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.1

The control of ionic transportation inside the multi asymmetric conical nanopores in polyethylene terephthalate (PET) membrane was investigated. The conical nanopores were prepared by chemical etching in irradiated PET foil using etchant (9 M NaOH) and stopping solution (1 M NaCl + 1 M HCOOH). The behavior of ionic current was recorded under stepping voltage - 2 V to +2 V at different molar concentrations of potassium halides (KCl, KBr and KI) under symmetric bathing condition in electrochemical cell. It is found that the presence of multiple ionic species and the occurrence of counterion condensation of charge regulated polyelectrolyte play an effective role in ionic current rectification (ICR). The electrical conductance of conical nanopores may be estimated by measuring the ionic current rectification properties of track-etched nanopores. The charge transport properties vary with molar concentration and pH of electrolyte. Moreover, ICR may be used as a voltage gating phenomena with wide technological applications.

Protective efficacy of Coriandrum sativum seeds against arsenic induced toxicity in Swiss albino mice

Kumar Arun,Kumar Vikas,Akhouri Vivek,Kumar Ranjit,Ali Mohammad,Rashmi Tuhin,Chand Gyanendra Bahadur,Singh Sushil Kumar,Ghosh Ashok Kumar 한국독성학회 2022 Toxicological Research Vol.38 No.4

Arsenic poisoning in ground water is one of the most sensitive environmental pollutant causing serious pollution all over the world. Chronic arsenic exposure through drinking water to humans leads to major public health related issues. There have been very meagre studies which reported that, the plant constituents proved to exhibit protective effect from arsenicosis. Therefore, the present study aims to evaluate the protective efficacy of Coriandrum sativum seeds extract against sodium arsenite induced toxicity in Swiss albino mice. In the present study twenty-four male healthy Swiss albino mice (30 ± 5 g) were divided into four groups (n = 6), where the control group received normal diet and water; group II and group III treated with sodium arsenite (2 mg per kg body weight per day) for 2 and 4 weeks respectively. The group IV mice were administered with C.sativum seeds extract at the dose of 150 mg per kg body weight per day for 4 weeks upon sodium arsenite pretreated (2 mg/kg body weight for 4 weeks per day) mice. After the complete dose duration, all the treatment group animals were sacrificed same day for haematological, biochemical and histopathological study. In the arsenic treated mice, there were significant (p < 0.0001) changes in the serum levels of ALT, AST, ALP, urea, uric acid and creatinine as well as in the haematological parameters. In contrast, after the administration with C.sativum seeds extract upon arsenic pretreated mice, there was significant (p < 0.0001) improvement observed in the hepatic and renal biomarker parameters as well as haematological variables. In the arsenic intoxicated mice, after administration with C.sativum seeds extract there was significant (p < 0.0001) reduction in the arsenic concentration in blood, liver and kidney tissues as well as in the serum LPO levels. Furthermore, the histopathological study showed that, C.sativum seeds extract administrated group of mice significantly restored the liver and kidney at cellular level against arsenic induced toxicity. The entire study concludes that C.sativum seeds extract possesses the ameliorative effect against arsenic induced liver and kidney intoxication.

Investigations of Biocompatible Systems for Reactive Extraction of Propionic Acid Using Aminic Extractants (TOA and Aliquat 336)

Sushil Kumar,B V Babu,Kailas L Wasewar 한국생물공학회 2012 Biotechnology and Bioprocess Engineering Vol.17 No.6

This paper presents the reactive extraction of propionic acid from aqueous solution by amine based extractants such as tri-n-octylamine and Aliquat 336,dissolved in a mixture of n-dodecane and 1-decanol. Equilibrium experiments were carried out to investigate the effects of various parameters such as modifier (1-decanol)concentration, extractant type, extractant composition,diluent composition, and initial acid concentration on the extraction efficiency. The extraction efficiency was found to be increased with an increase in modifier composition and extractant composition, and decreased with increases in initial acid concentration. Different biocompatible extractant/diluent systems such as (1) 20% TOA, 20% 1-decanol and 60% n-dodecane, (2) 20% TOA, 30% 1-decanol and 50% n-dodecane, (3) 30% TOA, 20% 1-decanol and 50% n-dodecane and (4) 25% Aliquat 336,25% 1-decanol and 50% n-dodecane are developed and used in this study. A mathematical model based on mass action law and a population-based search algorithm (differential evolution, DE) is proposed, and is used to estimate the extraction equilibrium constant (KE) and stoichiometry of reactive extraction. Individual equilibrium constants for the simultaneous formation of (1:1) and (2:1)acid:amine complexes are also determined. The extraction system comprised of 20% TOA, 30% 1-decanol, and 50%n-dodecane was found to be the best among the four biocompatible extractant/diluent systems studied. The loading ratios found in the range of 0.113 ~ 1.05 indicated the simultaneous formation of 1:1 and 2:1 complexes between acid and TOA. This paper presents the reactive extraction of propionic acid from aqueous solution by amine based extractants such as tri-n-octylamine and Aliquat 336,dissolved in a mixture of n-dodecane and 1-decanol. Equilibrium experiments were carried out to investigate the effects of various parameters such as modifier (1-decanol)concentration, extractant type, extractant composition,diluent composition, and initial acid concentration on the extraction efficiency. The extraction efficiency was found to be increased with an increase in modifier composition and extractant composition, and decreased with increases in initial acid concentration. Different biocompatible extractant/diluent systems such as (1) 20% TOA, 20% 1-decanol and 60% n-dodecane, (2) 20% TOA, 30% 1-decanol and 50% n-dodecane, (3) 30% TOA, 20% 1-decanol and 50% n-dodecane and (4) 25% Aliquat 336,25% 1-decanol and 50% n-dodecane are developed and used in this study. A mathematical model based on mass action law and a population-based search algorithm (differential evolution, DE) is proposed, and is used to estimate the extraction equilibrium constant (KE) and stoichiometry of reactive extraction. Individual equilibrium constants for the simultaneous formation of (1:1) and (2:1)acid:amine complexes are also determined. The extraction system comprised of 20% TOA, 30% 1-decanol, and 50%n-dodecane was found to be the best among the four biocompatible extractant/diluent systems studied. The loading ratios found in the range of 0.113 ~ 1.05 indicated the simultaneous formation of 1:1 and 2:1 complexes between acid and TOA.

SHARP ESTIMATES ON THE THIRD ORDER HERMITIAN-TOEPLITZ DETERMINANT FOR SAKAGUCHI CLASSES

Kumar, Sushil,Kumar, Virendra Korean Mathematical Society 2022 대한수학회논문집 Vol.37 No.4

In this paper, sharp lower and upper bounds on the third order Hermitian-Toeplitz determinant for the classes of Sakaguchi functions and some of its subclasses related to right-half of lemniscate of Bernoulli, reverse lemniscate of Bernoulli and exponential functions are investigated.

Quantum Communication Technology for Future ICT - Review

( Sushil Kumar Singh ),( Abir El Azzaoui ),( Mikail Mohammed Salim ),( Jong Hyuk Park ) 한국정보처리학회 2020 Journal of information processing systems Vol.16 No.6

In the last few years, quantum communication technology and services have been developing in various advanced applications to secure the sharing of information from one device to another. It is a classical commercial medium, where several Internet of Things (IoT) devices are connected to information communication technology (ICT) and can communicate the information through quantum systems. Digital communications for future networks face various challenges, including data traffic, low latency, deployment of high-broadband, security, and privacy. Quantum communication, quantum sensors, quantum computing are the solutions to address these issues, as mentioned above. The secure transaction of data is the foremost essential needs for smart advanced applications in the future. In this paper, we proposed a quantum communication model system for future ICT and methodological flow. We show how to use blockchain in quantum computing and quantum cryptography to provide security and privacy in recent information sharing. We also discuss the latest global research trends for quantum communication technology in several countries, including the United States, Canada, the United Kingdom, Korea, and others. Finally, we discuss some open research challenges for quantum communication technology in various areas, including quantum internet and quantum computing.

CONFORMAL HEMI-SLANT SUBMERSIONS FROM ALMOST HERMITIAN MANIFOLDS

Kumar, Sumeet,Kumar, Sushil,Pandey, Shashikant,Prasad, Rajendra Korean Mathematical Society 2020 대한수학회논문집 Vol.35 No.3

In this paper, our main objective is to introduce the notion of conformal hemi-slant submersions from almost Hermitian manifolds onto Riemannian manifolds as a generalized case of conformal anti-invariant submersions, conformal semi-invariant submersions and conformal slant submersions. We mainly focus on conformal hemi-slant submersions from Kähler manifolds. During this manner, we tend to study and investigate integrability of the distributions which are arisen from the definition of the submersions and the geometry of leaves of such distributions. Moreover, we tend to get necessary and sufficient conditions for these submersions to be totally geodesic for such manifolds. We also provide some quality examples of conformal hemi-slant submersions.

RADIUS ESTIMATES OF CERTAIN ANALYTIC FUNCTIONS

( Sushil Kumar Pratima Rai ),( Asena C. Etinkaya ) 호남수학회 2021 호남수학학술지 Vol.43 No.4

Numerical techniques are used to determine the radius of convexity of the starlike functions related to cardioid shaped bounded domain. In addition, radius constants of certain starlikeness associated with right half plane of various starlike functions are computed.

Predicting users' intention to continue mobile internet services usage

Sushil Kumar Muna(수실 쿠마르 무나),Seung Woon Kim(김승운),Hee Taek Kang(강희택) 한국산업정보학회 2008 한국산업정보학회 학술대회논문집 Vol.2008 No.10

기대일치이론에 기초한 기대일치모형은 정보시스템 연구 분야에서 정보시스템의 지속적인 사용 혹은 사용의도를 설명하는 핵심 이론으로 언급되어 왔다. 이러한 기대일치모형과 더불어 최근에 정보시스템 분야에서 주목을 받고 있는 또 다른 개념은 자동화된 행동 경향을 의미하는 ‘습관’이다. 본 연구에서는 이러한 두 가지 개념들을 기초로 모바일 인터넷 서비스에 대한 지속적인 이용 상황에서 습관과 기대일치모형을 통합하는 시도를 하였다. 이에 일치, 지각된 유용성, 지각된 사용 용이성, 습관 등의 수용후 신념, 이용자 만족, 지속적 이용의도로 구성된 연구모형을 구성하고 이를 검증하였다. J도내 250명의 대학생들을 대상으로 설문자료를 수집하여 분석한 결과, 기대일치와 지각된 유용성이 모바일 인터넷 서비스의 이용자 만족에 대한 주요 요인으로서 나타났다. 또한 지각된 유용성, 이용자 만족, 습관은 모바일 인터넷 서비스에 대한 지속적 이용의도를 결정하는 주요 요인으로 나타났다. 반면에 지각된 이용 용이성은 이용자 만족과 지속적 이용의도 모두에 대하여 아무런 관련성이 없는 것으로 나타났다.

Studies on thin films of lead chalcogenides

Sushil Kumar,Zishan H. Khan,M.A. Majeed Khan,M. Husain 한국물리학회 2005 Current Applied Physics Vol.5 No.6

A good deal of information regarding the synthesis and optoelectro-structural properties of thin lms of lead chalcogenideshave been revealed. The development of laser technology had opened up new application for narrow gap lead salts and their alloys.The polycrystalline thin lms were deposited onto optically plane and chemically clean glass substrates by vacuum evaporation tech-nique. The lms were thin, uniform, smooth and tightly adherent to the substrates.Optical absorption spectroscopy, X-ray dirac-tion technique and currentvoltage characteristics method were used to characterize the lms. The absorption coecients andoptical band gaps of lms were determined by using FTIR spectrophotometer. The nature of sample, crystal structure and latticeparameters of lms were found from X-ray diractograms. The dc conductivities and activation energies of lms were measured intemperature range 300380K. Schottky junctions of PbS, PbSe and PbTe with indium metal were made. The barrier heights andideality factors of these metalsemiconductor junctions were determined by usingIV characteristics..

Spetroscopic ellipsometry study on electrical and elemental properties of Sb-doped ZnO thin films

Sushil Kumar Pandey,Vishnu Awasthi,Shruti Verma,Mukul Gupta,Shaibal Mukherjee 한국물리학회 2015 Current Applied Physics Vol.15 No.4

Room-temperature spectroscopic ellipsometry data has been analyzed to determine the complex dielectric functions, ε(E) = ε1(E) + iε2(E) of as-deposited Sb-doped ZnO (SZO) thin films grown on n- Si(100) substrates by dual ion beam sputtering deposition system for different growth temperatures (Tg). The dielectric functions have been obtained from ellipsometry data analyses using Cody-Lorentz oscillator in the GenOsc model. A gradual reduction in the value of electron concentration and finally the conversion of doping characteristics from donor type to acceptor type was observed with the rise in Tg. This, in turn, resulted in the decline of broadening of ε1 peaks, and hence in the increase of excitonic lifetime. Optical band-gap energy was observed to decrease with increase in Tg from 200 to 300℃, and then rise continuously with further increase in Tg. X-ray diffraction measurements showed that all SZO films had (002) preferred crystal orientation. Hall measurement and X-ray photoelectron spectroscopy analysis confirmed that the change in the electrical conduction from n-to p-type was due to the enhancement in the value of Sb5+/Sb3+ ratio and SbZn-2VZn complex formation in SZO films.