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Suman,C.S.Pundir 한국물리학회 2003 Current Applied Physics Vol.3 No.2, 3
Commercially available cholesterol esterase, cholesterol oxidase and peroxidase have been co-immobilized onto alkylamine glassinitial activity. The co-immobilized enzyme system showed maximum activity at pH 7.0, when incubated at 37.C for 12 min. Amethod was developed for total serum cholesterol determination employing co-immobilized enzymes. There was a linear rela-tionship betweenA520 and cholesteryl acetate concentration ranging from 5mg to 50 mg/dl reaction mixture. The minimum de-tection limit of the method is 50 mg/dl. Within day and between day coecient of variation were< 1.0% and < 6%, respectively. Ar¼ 0:83) was found between the total serum cholesterol obtained by the present method and commercial Enzo-kitmethod employing free enzymes. Among the various serum substances tested at their physiological concentrations; Testosterone, vitD and progesterone caused 59%, 41% and 39% inhibition, while NaCl, KCl, CuSO4, creatinine, NaHCO3, albumin and estrogenhad practically no eect.. 2002 Elsevier Science B.V. All rights reserved.
Suman Laxmi Narayan,De Souvik,Sharma Gaurav,Mandal Udita,Bhattacherjee Rashmi,Banerjee Dhriti,Suman Devi Shankar 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.3
Biological control of larval mosquitoes is in great demand due to the development of resistance against synthetic insecticides, environmental toxicity and the inability to protect habitats from further oviposition. In the present study, three botanical essential oils (BEOs) – citronella, eucalyptus, and pine oils – were formulated for the assessment of larvicidal and oviposition repellent efficacies against Culex quinquefasciatus Say, the filaria vector. The GC–MS profiling of BEOs showed the presence of 16 – 19 compounds covering 87.7–93% of oil composition. The resistance status of Culex quinquefasciatus population was evaluated with temephos (LC 50 = 0.001 ppm, LC 90 = 0.01 ppm). Larval bioassay of emulsifiable concentrate (EC) formulations prepared from eucalyptus and pine oils showed promising efficacy (LC 50 = 22.7 and 23.2 ppm) and LC 90 (63.8 and 62.4 ppm) compared to citronella oil EC (LC 50 = 43.4 ppm and LC 90 = 199.0 ppm). The field trials of eucalyptus + pine (1:1 ratio) EC showed 100% larval mortality for 3 weeks at 300 ppm compared to 2 weeks of individual oils. Further, the oviposition attraction index (OAI) for ECs of eucalyptus, pine, and their combination showed complete protection of breeding habitats from oviposition at 1st week and − 0.9 to − 1.0 OAI at 2nd week with slight reduction to − 0.5 at 3rd week. Citronella EC provided shortest larvicidal and oviposition repellent efficacy under the field con ditions. The promising mosquitocidal activities of EC formulations of eucalyptus and pine or their combination suggest them as potential biocontrol vector control candidates over citronella oil.
Measurement and correlation of thermodynamic properties of ternary mixtures of oxygenated fuel
Suman Gahlyan,Rekha Devi,Sweety Verma,Manju Rani,박소진,Sanjeev Maken 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.7
Oxygenated fuels are of great interest as these are more energy efficient and environment friendly. Therefore, thermodynamic properties like density, ultrasonic speed and refractive indices of diisopropyl ether+benzene+nhexane mixtures were measured experimentally at 298.15 K, 308.15 K and 318.15 K. Excess properties like volume (Vm E ), isentropic compressibility (KS E), intermolecular free length (Lf E) as well as deviation in ultrasonic speed (u) and refractive index (n) of these mixtures were derived from experimental data. The Vm E values were also fitted to the Singh, Cibulka and Nagata equations, and the same were also predicted using Prigogine-Flory-Patterson theory and four geometrical models from constituent binary Vm E data. The u data were correlated by Nomato, van Dael, impedance dependence correlations and CFT theory at 298.15 K. Lf E and Va E were also calculated using Jacobson free length theory at 298.15 K. The n data were also predicted by Arago-Biot, Gladstone-Dale, Weiner, Heller, Newton, Eyring and John mixing rules.
AC impedance spectroscopic studies of transport properties in metal oxide doped α-NPD
Suman, C.K.,Yun, Jinyoung,Kim, Seohee,Lee, Sin-Doo,Lee, Changhee Elsevier 2009 Current Applied Physics Vol.9 No.5
<P><B>Abstract</B></P><P>The potential application of molecular organic semiconductor needs the control adjustment of conductivity. The hole transport materials (HTL) α<B>-</B>NPD (<I>N</I>,<I>N′</I>-di(1-naphthyl)-<I>N</I>,<I>N</I>′-diphenylbenzidin) has been doped with metal oxide (molybdenum oxide) for the study of transport phenomena. Impedance spectroscopic measurements were performed with the applied external electric filed. The activation energy calculated (0.55, 0.48 and 0.50eV) decreases with doping of metal oxide. There is a clear indication of space charge limited (SCL) conduction in the doped and undoped thin films. The cole–cole plot indicates the device can be represented by a parallel resistance and capacitance network in series with a series resistance (of 70Ω). At high frequency; the conduction follows the universal power law for both doped–undoped α-NPD with MoO<SUB>3</SUB> and the onset frequency increases with increasing bias voltages. The conduction mechanism can be explained by classical hopping barriers (CHB) mechanism for the system.</P>
Suman Gahlyan,Manju Rani,Inkyu Lee,문일,Sanjeev Kumar Maken 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.1
Excess molar volumes (VmE) have been measured at 303.15 K for 1-propanol+benzene or toluene or o- orm- or p-xylene mixtures using V-shape dilatometer. The VmEvalues, for an equimolar composition, vary in the order:benzene>toluene~m-xylene>o-xylene>p-xylene. The VmEdata have been used to calculate partial molar volumes,excess partial molar volumes, and apparent molar volumes of 1-propanol and aromatic hydrocarbons over the entirerange of composition. The excess volume data have also been interpreted in terms of graph-theoretical approach andPrigogine-Flory-Patterson theory (PFP). While PFP theory fails to predict the VmEvalues for systems with s-shaped VmEversus x1 graph, the VmEvalues calculated by graph theory compare reasonably well with the corresponding experimen-tal values. This graph theory analysis has further yielded information about the state of aggregation of pure compo-nents as well as of the mixtures.
Suman Kalyan Sardar(수만 칼얀 사르다르),Naveen Kumar(나빈 쿠마르),Seul Chan Lee(이슬찬) 대한인간공학회 2021 대한인간공학회 학술대회논문집 Vol.2021 No.11
Objective: The purpose of this study is to evaluate the importance of major research areas by identifying different machine learning techniques that influence key research fields on Human Status Detection (HSD). Background: HSD is concerned with the study of human-system interactions that uses theory, concepts, data, and techniques to design in order to improve human well-being and total performance. The basic premise of HSD is that effective performance comes from user-centered design and a comprehensive understanding of the user’s skills, needs, and preferences. Several machine learning algorithms have been used in the literature to measure the cognitive and physical workload status of the users. Method: In this research, PRISMA model has been applied to gather articles from three databases namely, ScienceDirect, IEEE Xplore, and Association for Computing Machinery (ACM). Sixteen keywords has been selected for collecting the articles from the databases. The following criterion is considered to develop protocol: (1) inclusion/exclusion criteria, (2) study selection, (3) data extraction, (4) data synthesis. Results: A total number of 82 articles were identified using an iterative collaboration of 80 keyword combinations addressing issues in different physical workloads and cognitive loads. A list of important occurrences was identified that may have an impact on the publication pattern. Conclusion: Recent publications on human status detection appear to be primarily concerned with cognitive load whereas previous articles were on detecting physical workload. Application: This study helps domain researchers to identify HSD techniques for their experimental studies.
Suman Gahlyan,Sweety Verma,Manju Rani,Sanjeev Maken 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.5
The deviation in viscosity was coupled with respective excess molar volume data to study the molecular interaction in binary mixtures with one associated component. This approach was applied to the experimentally measured viscosity and excess molar volume data of the 2-propanol+hydrocarbons at 298.15 K and 308.15 K. It was suggested that depolymerization power of aromatic hydrocarbon toward 2-propanol as well as strength of intermolecular interactions (electron-donor-acceptor type) between monomer of 2-propanol and aromatics depend on -electron density of the aromatic hydrocarbon. These interactions were further confirmed by FTIR spectroscopy. The viscosity of these binary mixtures was best predicted by Gruenberg-Nissan correlation among the four correlations applied.
Suman Chauhan,Sandeep Techno-Press 2023 Advances in environmental research Vol.12 No.1
In developing countries, solid waste is typically disposed of inappropriately, which has a negative impact on the environment and healthcare. One of the most serious environmental issues is the management of municipal solid waste because of the huge increase in waste generation brought on by industrialization, economic development, urbanization, and the exponential growth of Gurugram City's population. Municipal Corporation Gurugram (MCG) handles solid waste collection, transportation, and disposal. The city generates over 1100 tons of solid waste per day. In consideration of this, the current study employed the strengths, weaknesses, opportunities, and threats framework called SWOT analysis to critically examine the city's current methods for the management of municipal solid waste to provide more effective policy solutions. For conducting the analysis, the questionnaires and other interviews were conducted to gather information from households and officials in the city, and the observation made during field visits were recorded. The analysis shows that the waste management issue is getting worse for a variety of causes, including a lack of regulatory enforcement, insufficient technical and financial resources, insufficient people's participation, inadequate execution of policies, a lack of political priorities, and poor coordination between authorities.