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Nanoparticles Modified Electrodes: Synthesis, Modification, and Characterization—A review

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World Journal of Nano Science and Engineering 2022年第3期12卷 29-62页

作者： Temitayo o. Falola Department of Chemistry Illinois State University Normal Illinois USA

Nanoparticles offer unique features such as a larger surface area and enhanced electrochemical performance compared to their contemporary matters. These properties make them suitable to be considered in bridging the lacunae associated with the use of bare electrodes in electrochemical sensors. Nanomaterials enhance the redox reversibility on the electrodes’ surfaces, hence, improving the reproducibility, sensitivity, and limit of detection of the electrodes/sensors. Their methods of synthesis (top-to-bottom and bottom-to-to-top) are tailored toward manipulating their sizes, shapes, and preventing their agglomeration. This review paper provides a synopsis on research done in synthesizing nanoparticles, modifying electrodes, and pinpointing the improved performances of the modified electrodes via known characteristic techniques, namely: cyclic voltammetry, differential pulse voltammetry, and electrochemical impedance spectroscopy. In addition, a perspective is given in terms of increasing the lifespan of the working electrodes and the need for non-faradaic sensors.

关键词： Nanoparticles Turkevich Method Modification Characterization Limit of Detection redox reversibility Electrochemical Properties

A Comparative Study of Two Spatial Discretization Schemes for Advection Equation

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International Journal of Modern Nonlinear Theory and Application 2016年第1期5卷 59-66页

作者： Huda o. Bakodah Department of Mathematics Faculty of Science Al Faisaliah Campus King Abdulaziz University Jeddah Saudi Arabia

In this paper, we describe a comparison of two spatial discretization schemes for the advection equation, namely the first finite difference method and the method of lines. The stability of the methods has been studied by Von Neumann method and with the matrix analysis. The methods are applied to a number of test problems to compare the accuracy and computational efficiency. We show that both discretization techniques approximate correctly solution of advection equation and compare their accuracy and performance.

关键词： Advection Equation Finite Difference Method The Method of Lines Von Neumann Method

Dysphagia after vertical sleeve gastrectomy: Evaluation of risk factors and assessment of endoscopic intervention

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World Journal of Gastroenterology 2016年第47期22卷 10371-10379页

作者： Anand Nath Sayali Yewale Tung Tran John S Brebbia Timothy r Shope Timothy r Koch Department of Medicine Med Star-Washington Hospital Center and Georgetown University School of Medicine Washington DC 20010 United States Unterberg Children’s Hospital at Monmouth Medical Center Long Branch NJ07740 United States Center for Advanced Laparoscopic General and Bariatric Surgery MedS tar-Washington Hospital Center and Georgetown University School of Medicine Washington DC 20010 United States

AIM To evaluate the risks of medical conditions, evaluate gastric sleeve narrowing, and assess hydrostatic balloon dilatation to treat dysphagia after vertical sleeve gastrectomy(VSG).METHoDS VSG is being performed more frequently worldwide as a treatment for medically-complicated obesity, and dysphagia is common post-operatively. We hypothesize that post-operative dysphagia is related to underlying medical conditions or narrowing of the gastric sleeve. This is a retrospective, single institution study of consecutive patients who underwent sleeve gastrectomy from 2013 to 2015. Patients with previous bariatric procedures were excluded. Narrowing of a gastric sleeve includes: inability to pass a 9.6 mm gastroscope due to stenosis or sharp angulation or spiral hindering its *** of 400 consecutive patients, 352 are included; the prevalence of dysphagia is 22.7%; 33 patients(9.3%) have narrowing of the sleeve with 25(7.1%) having sharp angulation or a spiral while 8(2.3%) have a stenosis. All 33 patients underwent balloon dilatation of the gastric sleeve and dysphagia resolved in 13 patients(39%); 10 patients(30%) noted resolution of dysphagia after two additional dilatations. In a multivariate model, medical conditions associated with post-operative dysphagia include diabetes mellitus, symptoms of esophageal reflux, a low whole blood thiamine level, hypothyroidism, use of non-steroidal anti-inflammatory drugs, and use of *** Narrowing of the gastric sleeve and gastric sleeve stenosis are common after VSG. Endoscopic balloon dilatations of the gastric sleeve resolves dysphagia in 69% of patients.

关键词： obesity Bariatric surgery Vertical sleeve gastrectomy Dysphagia Stomach dilatation

Elaboration of a road Material Based on Clayey Soil and Crushed Sand

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Fluid Dynamics & Materials Processing 2022年第6期18卷 1595-1605页

作者： H.G.r.Sekloka C.P.Yabi r.Cloots M.Gibigaye Group of research in Energy and Environment from Materials(GrEENMAT) LiègeBelgium Laboratory of Energetics and Applied Mechanics(LEMA) CotonouBenin Laboratory of Tests and Studies in Civil Engineering(L2EGC) AbomeyBenin

To contribute to the enhancement of unconventional local materials used for road construction,this study characterizes a crushed sand 0/5,a clayey soil and the litho-stabilized material without and with hydraulic binder and determines their use in accordance with some reference specifications(CEBTP 1984).It is shown that the different components are not usable alone in pavement ***,the plasticity index obtained for the clayey soil is 21%,a value higher than the imposed *** addition,the grading of the 0/5 crushed sand does not fit into the range proposed by CEBTP.A combination of these two(02)components is therefore considered to obtain a suitable material usable for the *** new material does not enter any class of the CEBTP lateritic *** order to be used in base layer,a treatment with hydraulic binder is carried out with the intention to improve its mechanical *** optimal dosage of hydraulic binder to achieve the desired mechanical performance is obtained by studying the evolution of the mechanical characteristics of the *** this treatment,the Bearing ratio index of the mix increases from 37 to 223 for the optimal dosage and the dry compaction density decreases from 2.11 to 2.06 g/cm3 while the optimal water content increases from 9%to 10.1%.

关键词： Clayey sand crushed sand hydraulic binder road base

A New High Performance realization of Hyperchaotic Modified Canonical Chua Circuit Using JFETs

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Chinese Physics Letters 2008年第8期25卷 2803-2805页

作者： Prem Bhushan Mital Umesh Kumar r.S. Prasad IEC College of Engineering and Technology GB Nagar Pin-201 306 India Indian Institute of Technology Delhi Pin-110016 India Inderprastha Eng. College Sahibabad Ghaziabad (UP) India

A new implementation of hyperchaotic modified canonical Chua circuit using junction field-effect transistors （JFETs） is proposed. The design is based on a source coupled JFET circuit to approximate a smooth cubic nonlinearity and a two-terminal negative resistance element containing a p-n-p silicon transistor and an n-channel JFET. The realization is supported by orcad Pspice simulation and numerical MATLAB results. The hyperchaotic nature is confirmed by two positive Lyapunov exponents associated with the attractor which is a fractal with a Lyapunov dimension between 3 and 4.

关键词： oSCILLATor

EXPErIMENTAL rESEArCH oF EQUILIBrIUM AND NoNEQUILIBrIUM DYNAMIC ADSorPTIoN oF Cd^(++) IN SoIL--EFFECT oF DIFFErENT ACIDITIES AND SATUrATIoN

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Journal of Hydrodynamics 1992年第2期4卷 1-9页

作者： Huang Jun-qi Xie Xi-na Bai Yiao-dong, Institute of Porous Flow and Fluid Mechanics, NPCC and Academia Sinica, P.o.BoX 44, Langfang Hebei 102801, P.r.China

This paper studies water and solute transport in soil. It mainly deals with the adsorption behavior of heavy metal Cd^(++) in soil at different P^H values and the dynamic charac- ters of adsorption process in unsaturated state. Through theoretical analysis and experimental re- search, the adsorption isotherm and the equations of dynamic adsorption in saturated and unsatu- rated states are proposed.

关键词： soil adsorption dynamics unsaturation experiment

Unusual Polarization Properties of Supernova remnant G4.8＋6.2 at 1400MHz

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Chinese Physics Letters 2003年第6期20卷 969-971页

作者： ZHANGXi-Zhen r.G.Strom W.reich NationalAstronomicalobservatories ChineseAcademyofSciencesBeijing100012 AstronomicalInstitute UniversityofAmsterdamNetherlands Max-Planck-Institutfuerradioastronomie Postfach202453010BonnGermany

Unusual polarization properties of the high galactic latitude supernova remnant (SNr) G4.8+6.2 are reported. The percentage polarization is larger than 70% over the two main shells of G4.8+6.2 at 1400MHz. It is the second SNr with such high polarization at such a low frequency among the known 225SNrs. We show that this is very unusual for an SNr. Its morphology and polarization are very similar to those of the supernova remnant DA530 (G93.0+6.5), which is another high Galactic latitude SNr.

关键词： Polarization

Loss of Exchange Symmetry in Multiqubit States under Ising Chain Evolution

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Chinese Physics Letters 2011年第2期28卷 39-42页

作者： Sudha B.G.Divyamani A.r.Usha Devi Department of Physics Kuvempu UniversityShankaraghattaShimoga-577451India DAMTP Centre for Mathematical SciencesWilberforce RoadCambridgeCB3OWAUK Department of Physics Bangalore UniversityBangalore-560056India Inspire Institute Inc. McLeanVA 22101USA.

Keeping in view of importance of exchange symmetry aspects in studies on spin squeezing of multiqubit states,we show that the one-dimensional Ising Hamiltonian with nearest neighbor interactions does not retain the exchange symmetry of initially symmetric multiqubit *** we show that among 4-qubit states obeying exchange symmetry,all states except W class(and their linear combination)lose their symmetry under time evolution with Ising *** the loss of symmetry of the initially symmetric states to rotational asymmetry of the one-dimensional Ising Hamiltonian with more than 3 qubits,we indicate that all N-qubit states(N>5)obeying permutation symmetry lose their symmetry after time evolution with Ising Hamiltonian.

关键词： symmetry Ising qubit

Mode filtering based on ponderomotive force nonlinearity in a plasma filled rectangular waveguide

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Plasma Science and Technology 2017年第10期19卷 70-74页

作者： H SoBHANI H r SABoUHI S FEILI E DADAr Young researchers and Elite Club Qom Branch Islamic Azad University Department of Electrical Engineering Hormoz Branch Islamic Azad University Department of Physics Shahid Bahonar University Faculty of Economic Mofid University

Here a new scheme for mode filtering is proposed. Based on the ponderomotive force effect,propagation of the microwave dual-mode through a plasma-filled metallic rectangular waveguide is investigated. To excite the TE_（20） mode in a rectangular waveguide, the existence of fundamental modes is unavoidable. To filter the destructive mode（TE_（10））, the waveguide is filled with a collisional plasma. Based on the coupling effect, the energy of this destructive TE_（10） mode is transferred to the TE_（20） mode. The proposed structure acts like a mode convertor. The TE_（10） mode become more attenuated and instead the TE_（20） mode is amplified. The plasma filled rectangular waveguide acts as a mode filtering tool.

关键词： mode filtering mode convertor collisional plasma ponderomotive force