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Development of low power non-thermal plasma jet and optimization of operational parameters for treating dyes and emerging contaminants

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Plasma Science and technology 2022年第10期24卷 86-97页

作者： Deepchandra JOSHI g Veda PRAKASH Shaikh Ziauddin AHAMMAD Satyananda KAR t R SREEKRISHNAN Department of Biochemical Engineering and Biotechnology Indian Institute of Technology DelhiNew Delhi 110016India Department of Energy Science and Engineering Indian Institute of Technology DelhiNew Delhi 110016India

Non-thermal plasma has emerged as an effective treatment system against the latest class of highly recalcitrant and toxic environmental pollutants termed emerging contaminants(ECs).In the present work,a detailed experimental study is carried out to evaluate the efficacy of a non-thermal plasma jet with two dyes,Rd.B and ***,as model *** plasma jet provided a complete dye decoloration in 30 min with an applied voltage of 6.5 kV_(p-p).·OH,having the highest oxidation potential,acts as the main reactive species,which with direct action on contaminants also acts indirectly by getting converted into H_(2)O_(2)and O_(3).Further,the effect of critical operational parameters viz,sample pH,applied voltage(4.5–6.5 kV_(p-p)),conductivity(5–20 mS cm^(-1)),and sample distance on plasma treatment efficacy was also *** of all the assessed parameters,the applied voltage and sample conductivity was found to be the most significant operating parameters.A high voltage and low conductivity favored the dye decoloration,while the pH effect was not that *** understand the influence of plasma discharge gas on treatment efficacy,all the experiments are conducted with argon and helium gases under the fixed geometrical *** the gases provided a similar dye decoloration *** DBD plasma system with complete dye removal also rendered maximum mineralization of 73%for Rd.B,and 60%for ***,the system's efficiency against the actual ECs(four pharmaceutical compounds,viz,metformin,atenolol,acetaminophen,and ranitidine)and microbial contaminant(***)was also *** system showed effectivity in the complete removal of targeted pharmaceuticals and a log2.5 *** *** present systematic characterization of dye degradation could be of interest to large communities working towards commercializing plasma treatment systems.

关键词： advanced oxidation processes(AOPs) non-thermal plasma dye-degradation ECs treatment reactive species quantification mineralization

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Investigation of the ^(121)Sb(α,γ)^(125)I reaction cross-section calculations at astrophysical energies

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Nuclear Science and techniques 2023年第11期34卷 85-92页

作者： M.Eroğlu C.Yalcın R.t.güray Department of Physics Kocaeli UniversityUmuttepe41001 KocaeliTurkey Department of Electronics and Automation Piri Reis University34940 TuzlaIstanbulTurkey

Proton-rich nuclei are synthesized via photodisintegration and reverse *** examine this mechanism and reproduce the observed p-nucleus abundances,it is crucial to know the reaction rates and thereby the reaction cross sections of many *** that the number of experiments on the reactions in astrophysical energy regions is very rare,the reaction cross sections are determined by theoretical methods whose accuracy should be *** this study,given that ^(121)Sb is a stable seed isotope located in the region of medium-mass p-nuclei,we investigated the cross sections and reaction rates of the ^(121)Sb(α,γ)^(125)I reaction using the tALYS computer code with 432 different combinations of input parameters(OMP,LDM,and SFM).the optimal model combinations were determined using the threshold logic unit *** theoretical reaction cross-sectional results were compared with the experimental results reported in the *** reaction rates were determined using the two input parameter sets most compatible with the measurements,and they were compared with the reaction rate databases:StARLIB and REACLIB.

关键词： Cross section Astrophysical S-factor Astrophysical reaction rate p-process nucleosynthesis threshold logic unit method

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System-Level Performance Evaluation of Very High Complexity Media Applications : A H264/AVC Encoder Case Study

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International Journal of Communications, Network and System Sciences 2011年第7期4卷 436-446页

作者： Hajer Krichene Zrida Abderrazek Jemai Ahmed C ammari Mohamed Abid 不详

given the substantially increasing complexity of embedded systems, the use of relatively detailed clock cycle-accurate simulators for the design-space exploration is impractical in the early design stages. Raising the abstraction level is nowadays widely seen as a solution to bridge the gap between the increasing system complexity and the low design productivity. For this, several system-level design tools and methodologies have been introduced to efficiently explore the design space of heterogeneous signal processing systems. In this paper, we demonstrate the effectiveness and the flexibility of the Sesame/Artemis system-level modeling and simulation methodology for efficient peformance evaluation and rapid architectural exploration of the increasing complexity heterogeneous embedded media systems. For this purpose, we have selected a system level design of a very high complexity media application;a H.264/AVC (Advanced Video Codec) video encoder. the encoding performances will be evaluated using system-level simulations targeting multiple heterogeneous multiprocessors platforms.

关键词： System-Level Performance Evaluation Embedded Systems Design Space Exploration tools the Sesame/Artemis Design tool a Parallel H.264/AVC Video Encoder

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Optoelectronic and thermoelectric properties of Zintl YLi_(3)A_(2)(A = Sb,Bi) compounds through modified Becke-Johnson potential

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Chinese Physics B 2016年第10期25卷 428-435页

作者： t Seddik g Ugur R Khenata S Ugur F Soyalp g Murtaza D P Rai A Bouhemadou S Bin Omran Department of Physics and Astronomy College of ScienceKing Saud UniversityP.O.Box 2455Riyadh 11451Saudi Arabia

In the present work,we investigate the structural,optoelectronic and thermoelectric properties of the YLi3X2(X = Sb,Bi) compounds using the full potential augmented plane wave plus local orbital(FP-APW+lo) *** exchangecorrelation potential is treated with the generalized gradient approximation/local density approximation(ggA/LDA) and with the modified Becke-Johnson potential(tB-mBJ) in order to improve the electronic band structure *** addition,the estimated ground state properties such as the lattice constants,external parameters,and bulk moduli agree well with the available experimental *** band structure calculations with ggA and LDA predict that both compounds have semimetallic ***,the band structure calculations with the ggA/tB-mBJ approximation indicate that the ground state of the YLi3Sb2compound is semiconducting and has an estimated indirect band gap(Γ-L) of about 0.036 eV while the ground state of YLi3Bi2compound is *** the LDA/tB-mBJ calculations indicate that both compounds exhibit semiconducting characters and have an indirect band gap(Γ-L) of about 0.15 eV and 0.081 eV for YLi3Sb and ***,the optical properties reveal strong responses of the herein materials in the energy range between the IR and extreme UV *** properties such as thermal conductivity,electrical conductivity,Seebeck coefficient,and thermo power factors are also calculated.

关键词： Zintl compounds tB-mBJ electronic band-structure optical properties thermoelectric properties

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An Intrusion Detection System for SDN Using Machine Learning

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Intelligent Automation & Soft Computing 2023年第1期35卷 867-880页

作者： g.Logeswari S.Bose t.Anitha Department of Computer Science and Engineering College of EngineeringGuindyAnna UniversityChennaiTamilnaduIndia

Software Defined Networking(SDN)has emerged as a promising and exciting option for the future growth of the *** has increased the flexibility and transparency of the managed,centralized,and controlled *** the other hand,these advantages create a more vulnerable environment with substantial risks,culminating in network difficulties,system paralysis,online banking frauds,and *** issues have a significant detrimental impact on organizations,enterprises,and even ***,high performance,and real-time systems are necessary to achieve this *** a SDN to extend intelligent machine learning methodologies in an Intrusion Detection System(IDS)has stimulated the interest of numerous research investigators over the last *** this paper,a novel HFS-LgBM IDS is proposed for ***,the Hybrid Feature Selection algorithm consisting of two phases is applied to reduce the data dimension and to obtain an optimal feature *** thefirst phase,the Correlation based Feature Selection(CFS)algorithm is used to obtain the feature *** optimal feature set is obtained by applying the Random Forest Recursive Feature Elimination(RF-RFE)in the second phase.A LightgBM algorithm is then used to detect and classify different types of *** experimental results based on NSL-KDD dataset show that the proposed system produces outstanding results compared to the existing methods in terms of accuracy,precision,recall and f-measure.

关键词： Intrusion detection system light gradient boosting machine correlation based feature selection random forest recursive feature elimination software defined networks

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Effect of Pressure on Intermediate Valence States in Cerium Kondo Compounds

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Journal of Rare Earths 2004年第1期22卷 7-12页

作者： Oomi g Kagayama t Smith J L Lacerda A H Kaji S Ohashi M Department of Physics Kyushu University Ropponmatsu Fukuoka 810-8560 Japan Department of Mechanical Engineering and Materials Sciences Kumamoto University Kumamoto 860-8555 Japan Materials Science and technology Los Alamos National Laboratory Los Alamos NM 87545 USA

Electrical resistance, thermal expansion, lattice constants of the intermediate valence materials, α-Ce and CeBe 13, were measured at high pressure. It is found that the grüneisen parameters of Kondo temperature t K are 13 and 42 for α-Ce and CeBe 13, respectively, and it decreases with increasing pressure. the magnetoresistance of α-Ce shows H2 dependence and its coefficient increases with pressure below 1 gPa, but becomes nearly constant above 1 gPa. the results indicate that the intermediate valence states are enhanced at high pressure indicating the enhancement of hybridization between the 4f electron and conduction band.

关键词： condensel physics intermediate valence materials cerium rare earths

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Numerical investigations on HCCI engine with increased induction induced swirl and engine speed

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Journal of Central South University 2015年第10期22卷 3837-3848页

作者： t.Karthikeya Sharma g.Amba Prasad Rao K.Madhu Murthy Department of Mechanical Engineering NIT

Homogeneous charge compression ignition(HCCI) mode of combustion is popularly known for achieving simultaneous reduction of NOx as well as soot emissions as it combines the compression ignition(CI) and spark ignition(SI) engine features. In this work, a CI engine was simulated to work in HCCI mode and was analyzed to study the effect of induction induced swirl under varying speeds using three-zone extended coherent flame combustion model(ECFM-3Z, compression ignition) of StAR-CD. the analysis was done considering speed ranging from 800 to 1600 r/min and swirl ratios from 1 to 4. the present study reveals that ECFM-3Z model has well predicted the performance and emissions of CI engine in HCCI mode. the simulation predicts reduced in-cylinder pressures, temperatures, wall heat transfer losses, and piston work with increase in swirl ratio irrespective of engine speed. Also, simultaneous reduction in CO2 and NOx emissions is realized with higher engine speeds and swirl ratios. Low speeds and swirl ratios are favorable for low CO2 emissions. It is observed that increase in engine speed causes a marginal reduction in in-cylinder pressures and temperatures. Also, higher turbulent energy and velocity magnitude levels are obtained with increase in swirl ratio, indicating efficient combustion necessitating no modifications in combustion chamber design. the investigations reveal a total decrease of 38.68% in CO2 emissions and 12.93% in NOx emissions when the engine speed increases from 800 to 1600 r/min at swirl ratio of 4. Also an increase of 14.16% in net work done is obtained with engine speed increasing from 800 to 1600 r/min at swirl ratio of 1. the simulation indicates that there is a tradeoff observed between the emissions and piston work. It is finally concluded that the HCCI combustion can be regarded as low temperature combustion as there is significant decrease in in-cylinder temperatures and pressures at higher speeds and higher swirl ratios.

关键词： HCCI engine ECFM-3Z swirl ratio emissions and performance

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Microstructure and mechanical properties of AZ61 Mg alloy prepared by multi directional forging

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transactions of Nonferrous Metals Society of China 2010年第7期20卷 1294-1298页

作者： H. MIURA g. YU X. YANg t. SAKAI Department of Mechanical Engineering and Intelligent Systems University of Electro-Communications Chofu Tokyo 182-8585 Japan School of Materials Science and Engineering Central South University Changsha 410083 China

AZ61Mg alloy was multi directionally forged(MDFed) during decreasing temperature condition from 643 K to 483 K at a true strain rate of 3×10-3 s-1 up to cumulative strain of∑△ε=4.0 at maximum.A pass strain of△ε=0.8 was *** average grain size decreased gradually with increasing cumulative strain,the evolution of fine-grained structure strongly depended on the MDF *** the condition where the temperature was higher than the most adequate one,grain coarsening partially took place during *** contrast,at lower temperature,inhomogeneous microstructure composed of the initial coarse and newly appeared fine grains was *** straining over∑△ε=3.2(i.e.,over 4 passes of MDF) ,equiaxed ultrafine grains(UFgs) having average size of about and lower than 1μm were uniformly *** the MDFed alloy to∑△ε=4.0 possessed relatively high hardness of HV 99,and it accepted further about 20%cold rolling almost without *** of the superior formability of the UFged AZ61Mg alloy,the hardness was further easily raised to HV 120 by following cold rolling.

关键词： AZ61 magnesium alloy ultrafine grain plastic deformation multi directional forging

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CONVERgENCE OF LOgARItHMIC MEANS OF MULtIPLE WALSH-FOURIER SERIES

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Analysis in theory and Applications 2005年第4期21卷 326-338页

作者： g.gát U.goginava g.tkebuchava College of Nyíregyháza Hungary tbilisi State University Georgia

Norlund logarithmic means of multiple Walsh-Fourier series acting from space L In^d-1 L （[0, 1）d）, d≥1 into space weak - LI（[0,1）^d） are studied. the maximal Orlicz space such that the Norlund logarithmic means... 详细信息

关键词： Multiple Walsh-Fourier series convergence in metric and in measure Norlund means

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AN APPLICAtION OF FOKKER-PLANCK EQUAtION tO JOSEPHSON JUNCtION

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Acta Mathematica Scientia 1989年第1期9卷 109-120页

作者： g.Liao A.F.Laurence A.t.Abawi Department of Mathematics University of Utah Salt Lake City UT 84112Center for Molecular Electronics Carnegie-Mellon University Pittsburg PA 15213Department of Physics University of California San Diego La Jolla CA 92093

A long Josephson junction can be modeled by a perturbed sine-gordon equation. Based on a soliton perturbation theory, the probability distribution of the velocity of a single soliton, at the presence of a white noise contained in bias current, is studied by the Fokker-Planck method. this approach can be extended to the study of multisolitons.

关键词： soliton perturbation perturbed junction contained modeled Planck normalized Langevin formal

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