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Journal articles on the topic 'Half-wave potential'

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Published: 4 June 2021
Last updated: 1 February 2022

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1

Touhami, Imen, and Djelloul Messadi. "QSER study for half wave potential of some PAHs." Energy Procedia 157 (January 2019): 522–32. http://dx.doi.org/10.1016/j.egypro.2018.11.216.

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2

Durst, R. "Effect of ionic strength on the polarographic half-wave potential." Analytica Chimica Acta 250, no. 2 (October 21, 1991): 3–12. http://dx.doi.org/10.1016/0003-2670(91)85002-a.

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3

Durst, Richard A., and David N. Hume. "Effect of ionic strength on the polarographic half-wave potential." Analytica Chimica Acta 251, no. 1-2 (October 1991): 3–12. http://dx.doi.org/10.1016/0003-2670(91)87109-k.

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4

Farwaha, Hardeep S., Götz Bucher, and John A. Murphy. "A novel neutral organic electron donor with record half-wave potential." Organic & Biomolecular Chemistry 11, no. 46 (2013): 8073. http://dx.doi.org/10.1039/c3ob41701h.

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5

Noorizadeh, Hadi, and Abbas Farmany. "Theoretical prediction for the half wave reduction potential of organic molecules." Russian Journal of Electrochemistry 50, no. 6 (February 4, 2014): 579–86. http://dx.doi.org/10.1134/s102319351401008x.

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6

Pak, R. Y. S. "Asymmetric Wave Propagation in an Elastic Half-Space by a Method of Potentials." Journal of Applied Mechanics 54, no. 1 (March 1, 1987): 121–26. http://dx.doi.org/10.1115/1.3172945.

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A method of potentials is presented for the derivation of the dynamic response of an elastic half-space to an arbitrary, time-harmonic, finite, buried source. The development includes a set of transformed stress-potential and displacement-potential relations which are apt to be useful in a variety of wave propagation problems. Specific results for an embedded source of uniform distributions are also included.
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7

NI, DONGDONG, and ZHONGZHOU REN. "SYSTEMATIC CALCULATION OF α-DECAY HALF-LIVES WITHIN GENERALIZED DENSITY-DEPENDENT CLUSTER MODEL." International Journal of Modern Physics E 19, no. 08n09 (September 2010): 1592–602. http://dx.doi.org/10.1142/s0218301310016004.

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An improved version of the generalized density-dependent cluster model is presented to describe an α particle tunneling through a microscopic potential barrier. The microscopic potential is numerically constructed in the double folding model for both the Coulomb potential and the nuclear potential. The decay width is computed using the integral of the quasibound state wave function, the scattering state wave function, and the difference of potentials. We perform a systematic calculation of α-decay half-lives for even-even, odd-A, and odd-odd nuclei ranging from N = 84 to N = 126. The calculated α-decay half-lives are found to be in good agreement with the experimental values.
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8

Schultz, William W., Jin Huh, and Owen M. Griffin. "Potential energy in steep and breaking waves." Journal of Fluid Mechanics 278 (November 10, 1994): 201–28. http://dx.doi.org/10.1017/s0022112094003678.

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We find that the RMS wave height (square root of the potential energy) rather than peak-to-peak wave height is a better experimental and analytic criterion for determining when a regular, two-dimensional deep-water wave will break. A spectral algorithm for two-dimensional potential flow is developed and used to compare breaking onset criteria for energy input from (i) converging sidewalls, (ii) a submerged disturbance, and (iii) wave focusing. We also find that wave-breaking criteria (potential energy or the more classical peak-to-peak wave height) are a function of the rate of energy input. Large plunging waves occur when energy input rates are large. As energy input rates become smaller there is a smooth transition to smaller spilling waves. The various energy input methods show similar breaking trends in the limit as the energy input rate becomes small - waves break when the potential energy becomes approximately 52 % of the energy for the most energetic Stokes wave, with the formation of a singularity immediately before the crest. The effects of wave modulation and reflection are briefly discussed and shown not to affect the potential energy breaking criterion significantly. The experimental scatter of the RMS wave height is shown to be half that of wave steepness during incipient breaking in wave packets.
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9

Eskandari-Ghadi, Morteza, and Amirhossein Amiri-Hezaveh. "Wave propagations in exponentially graded transversely isotropic half-space with potential function method." Mechanics of Materials 68 (January 2014): 275–92. http://dx.doi.org/10.1016/j.mechmat.2013.09.009.

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10

OHISHI, YOSHITAKA, KIYOSHI KURIYAMA, YOSHIO DOI, and TERUO NAKANISHI. "Antibacterial activity and polarographic half-wave reduction potential of 2-nitrobenzo(b)furans." CHEMICAL & PHARMACEUTICAL BULLETIN 33, no. 7 (1985): 2854–61. http://dx.doi.org/10.1248/cpb.33.2854.

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11

Nesmerak, Karel, Andrey A. Toropov, Alla P. Toropova, Petra Kohoutova, and Karel Waisser. "SMILES-based quantitative structure–property relationships for half-wave potential of N-benzylsalicylthioamides." European Journal of Medicinal Chemistry 67 (September 2013): 111–14. http://dx.doi.org/10.1016/j.ejmech.2013.05.031.

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12

Zhang, Qiang, Xuan-Zhang Wang, Shu-Fang Fu, Jing Bai, and Sheng Zhou. "MnF2/SiO2Transport Properties of Quasiperiodic Photonic Crystals for Potential Catalytic Applications." Journal of Nanomaterials 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/798272.

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Magnetically recyclable materials should be ideal support in photocatalytic system because they permit the photocatalysts to be recovered rapidly and efficiently by applying an external magnetic field such as, MnF2. In this paper, MnF2and SiO2layers constitute a one-dimensional quasiperiodic photonic crystal according to Fibonacci. When the electromagnetic wave irradiates obliquely, the transmission peak moves to higher frequency direction with the angle increasing. Both the number of transmission peaks and the transmission peaks of double-forked structure increase with the increase of structural progression. We also found that the polarization of electromagnetic waves has influence on the transmission properties; TM wave transmission peak half wide is significantly greater than TE wave transmission peak half wide. The band gap near antiferromagnetic (AF) resonance frequency becomes narrow as the intensity of the applied static magnetic field increases. The as-prepared photonic crystal has tremendous potential practical use to eliminate organic pollutants from wastewater.
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13

Yang, Hai-Feng, Yao-Hua Hu, and Yong-Gang Tan. "Transfer of a wave packet in double-well potential." International Journal of Modern Physics B 32, no. 11 (April 16, 2018): 1850131. http://dx.doi.org/10.1142/s021797921850131x.

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Energy potentials with double-well structures are typical in atoms and molecules systems. A manipulation scheme using Half Cycles Pulses (HCPs) is proposed to transfer a Gaussian wave packet between the two wells. On the basis of quantum mechanical simulations, the time evolution and the energy distribution of the wave packet are evaluated. The effect of time parameters, amplitude, and number of HCPs on spatial and energy distribution of the final state and transfer efficiency are investigated. After a carefully tailored HCPs sequence is applied to the initial wave packet localized in one well, the final state is a wave packet localized in the other well and populated at the lower energy levels with narrower distribution. The present scheme could be used to control molecular reactions and to prepare atoms with large dipole moments.
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14

Zhao, Jujiao, Bo Shang, and Jun Zhai. "N-Doped Graphene as an Efficient Metal-Free Electrocatalyst for Indirect Nitrate Reduction Reaction." Nanomaterials 11, no. 9 (September 17, 2021): 2418. http://dx.doi.org/10.3390/nano11092418.

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N-doped graphene samples with different N species contents were prepared by a two-step synthesis method and evaluated as electrocatalysts for the nitrate reduction reaction (NORR) for the first time. In an acidic solution with a saturated calomel electrode as reference, the pyridinic-N dominant sample (NGR2) had an onset of 0.932 V and a half-wave potential of 0.833 V, showing the superior activity towards the NORR compared to the pyrrolic-N dominant N-doped graphene (onset potential: 0.850 V, half-wave potential: 0.732 V) and the pure graphene (onset potential: 0.698 V, half-wave potential: 0.506 V). N doping could significantly boost the NORR performance of N-doped graphene, especially the contribution of pyridinic-N. Density functional theory calculation revealed the pyridinic-N facilitated the desorption of NO, which was kinetically involved in the process of the NORR. The findings of this work would be valuable for the development of metal-free NORR electrocatalysts.
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15

Mücke, Philipp, Rainer F. Winter, and Konrad Kowalski. "Lack of electronic coupling despite half-wave potential splittings in ferrocenylvinyl-substituted [2.2]-paracyclophanes." Journal of Organometallic Chemistry 735 (July 2013): 10–14. http://dx.doi.org/10.1016/j.jorganchem.2013.03.024.

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16

Dai, Yi-min, Hui Liu, Lan-li Niu, Cong Chen, Xiao-qing Chen, and You-nian Liu. "Estimation of half-wave potential of anabolic androgenic steroids by means of QSER approach." Journal of Central South University 23, no. 8 (August 2016): 1906–14. http://dx.doi.org/10.1007/s11771-016-3246-2.

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17

Zanotto, F. M., R. A. Fernández, and S. A. Dassie. "Facilitated proton transfer reactions via water autoprotolysis across oil|water interfaces. Half-wave potential." Electrochimica Acta 332 (February 2020): 135498. http://dx.doi.org/10.1016/j.electacta.2019.135498.

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18

Attanayake, N. Harsha, Aman Preet Kaur, T. Malsha Suduwella, Corrine F. Elliott, Sean R. Parkin, and Susan A. Odom. "A stable, highly oxidizing radical cation." New Journal of Chemistry 44, no. 42 (2020): 18138–48. http://dx.doi.org/10.1039/d0nj04434b.

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19

Mahmoodi Kordkheili, Hamidreza, Gholamreza Ghodrati Amiri, and Mahmood Hosseini. "Axisymmetric wave propagation of thermoelastic transversely isotropic half-space under buried loading using potential functions." Waves in Random and Complex Media 28, no. 4 (May 4, 2018): 760–83. http://dx.doi.org/10.1080/17455030.2018.1468120.

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20

Niyazymbetov, M. E., and V. A. Petrosyan. "The half-wave oxidation potential as a criterion for estimating the reactivity of anionic nucleophiles." Bulletin of the Academy of Sciences of the USSR Division of Chemical Science 40, no. 11 (November 1991): 2149–53. http://dx.doi.org/10.1007/bf00961027.

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21

Pahlavani, Mohammadreza, and Behnam Firoozi. "Study of Electromagnetic Multipole Transition Half-Lives of One-Hole 15O–15N and One-Particle 17O–17F Mirror Nuclei." Zeitschrift für Naturforschung A 68, no. 10-11 (November 1, 2013): 709–14. http://dx.doi.org/10.5560/zna.2013-0056.

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Energy spectrum and wave functions are obtained numerically with a potential consisting of Woods-Saxon, Coulomb, and spin-orbit coupling parts for the nuclei 15O, 15N, 17O, and 17F. The radial parts of the wave functions are used to calculate some matrix elements of electromagnetic transitions. These results are applied to calculate half-lives of low-lying exited states in the one-particle 17O and 17F as well as in the one-hole 15O and 15N isotopes. The calculated half-lives are compared with available experimental and theoretical results based on harmonic oscillator wave functions and Weisskopf units. In comparison with the results calculated from the other methods, our results based on the Woods-Saxon potential indicate a satisfactory agreement with accessible experimental data.
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22

Zhong, Haobin, Changwei Shi, Jiantao Li, Ruohan Yu, Qiang Yu, Haoyun Liu, Yao Yao, Jinsong Wu, Liang Zhou, and Liqiang Mai. "Cobalt decorated nitrogen-doped carbon bowls as efficient electrocatalysts for the oxygen reduction reaction." Chemical Communications 56, no. 32 (2020): 4488–91. http://dx.doi.org/10.1039/c9cc10036a.

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23

Xie, Zu Feng, Qing Bang Han, and Chang Ping Zhu. "Research of Porous Solid - Fluid Interface Scholte Wave." Advanced Materials Research 538-541 (June 2012): 2175–80. http://dx.doi.org/10.4028/www.scientific.net/amr.538-541.2175.

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This paper establishes the theoretical model of Scholte wave velocity on the fluid-porous medium interface based on the Biot theory of porous media. We firstly simulates and analysis sound propagation characteristics of fluid-saturated porous, and then we deduces the secular equation of fluid-solid interface wave on semi-infinite half-space applying potential function method. This study will provide a theoretical guidance of detecting the interface wave between fluid and porous media.
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24

Filimonov, Dmitry A., Tatyana F. Yudina, Ilya V. Bratkov, Nikolai A. Leontiev, and Tatiana V. Ershova. "ELECTROCHEMICAL PROPERTIES OF THERMALLY EXPANDED GRAPHITES AND OXIDIZED GRAPHITES MODIFIED WITH TRANSITION METAL SALTS." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 59, no. 3 (July 12, 2018): 55. http://dx.doi.org/10.6060/tcct.20165903.5308.

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The data were presented on study by electrochemical properties (the redox potential, the effective number of electrons, half-wave potential, current density) of thermally expanded graphite and oxidized graphite modified with metal salts (Fe2+, Co2+, Ni2+, Cu2+, Zn2+) in alkaline environment.
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25

Zhang, Jingrui, and Yanyan Li. "A Two-Dimensional Generalized Electromagnetothermoelastic Diffusion Problem for a Rotating Half-Space." Mathematical Problems in Engineering 2014 (2014): 1–12. http://dx.doi.org/10.1155/2014/964218.

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In the context of the theory of generalized thermoelastic diffusion, a two-dimensional generalized electromagnetothermoelastic problem with diffusion for a rotating half-space is investigated. The rotating half-space is placed in an external magnetic field with constant intensity and its bounding surface is subjected to a thermal shock and a chemical potential shock. The problem is formulated based on finite element method and the derived finite element equations are solved directly in time domain. The nondimensional temperature, displacement, stress, chemical potential, concentration, and induced magnetic field are obtained and illustrated graphically. The results show that all the considered variables have a nonzero value only in a bounded region and vanish identically outside this region, which fully demonstrates the nature of the finite speeds of thermoelastic wave and diffusive wave.
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26

Bhoi, Swagatika, and Basudeb Sahu. "Unearthing radial independence for prediction of alpha-decay half-lives." International Journal of Modern Physics E 27, no. 06 (June 2018): 1850048. http://dx.doi.org/10.1142/s0218301318500489.

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Nuclear radial distance is a prerequisite for generating any alpha-decay half-life formula by taking a suitable effective potential. We study the emission process of alpha particles from an isolated quasi-bound state generated by an effective potential to a scattering state. The effective potential is expressed in terms of Frahn form of potential which is exactly solvable and an analytical expression for half-life is obtained in terms of Coulomb function, wave function and the potential. We then derive a closed-form expression for the decay half-life in terms of the parameters of the potential, Q-value of the system, mass and proton numbers of the nuclei valid for alpha-decay as well as proton-decay. From the nature of variations of half-life as a function of radial distance, we trace the radial independence region where decay time is almost constant. Finally, by overviewing our results and picking that particular radial distance, we predict the half-lives of a series of nuclei by using the closed-form expression. We also predict the half-lives of isotopes of nuclei with [Formula: see text] and 120.
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27

Teymouri, Hamid, Ali Khojasteh, Mohammad Rahimian, and Ronald Y. S. Pak. "Wave motion in multi-layered transversely isotropic porous media by the method of potential functions." Mathematics and Mechanics of Solids 25, no. 3 (October 24, 2019): 547–72. http://dx.doi.org/10.1177/1081286519883925.

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Wave propagation in a multi-layered transversely isotropic porous medium has been considered in this paper, which consists of n parallel layers overlying on a half-space. Potential functions are used to solve elastodynamic differential equations of the poroelastic medium. Time-harmonic excitation is assumed and the procedure of solution is performed in the frequency domain. Generalized reflection and transmission matrices are generated for compressional and shear waves separately. By means of the Hankel transformation method, coupled differential equations are altered to ordinary ones and Riemann surfaces are used to establish the path of integrations. A closed-form solution is described to reach Green’s functions of displacements and stresses. Some special cases of excitations are discussed and verification of the solution is presented. The numerical results of a three-layered medium on a porous half-space are determined and discussed.
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28

Fatemi, Mohammad Hossein, Mohammad Reza Hadjmohammadi, Kamyar Kamel, and Poriya Biparva. "Quantitative Structure–Property Relationship Prediction of the Half-Wave Potential for Substituted Nitrobenzenes in Five Nonaqueous Solvents." Bulletin of the Chemical Society of Japan 80, no. 2 (January 15, 2007): 303–6. http://dx.doi.org/10.1246/bcsj.80.303.

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29

Calbo, Joaquín, Rafael Viruela, Enrique Ortí, and Juan Aragó. "Relationship between Electron Affinity and Half-Wave Reduction Potential: A Theoretical Study on Cyclic Electron-Acceptor Compounds." ChemPhysChem 17, no. 23 (September 28, 2016): 3881–90. http://dx.doi.org/10.1002/cphc.201600778.

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30

CHEN, WEN-LI, GAO-FENG WEI, and WEN-CHAO QIANG. "THE APPROXIMATE ANALYTICAL SOLUTIONS OF THE KLEIN–GORDON EQUATION WITH THE SECOND PÖSCHL–TELLER LIKE POTENTIAL FOR NONZERO ANGULAR MOMENTUM." Modern Physics Letters A 24, no. 17 (June 7, 2009): 1371–82. http://dx.doi.org/10.1142/s0217732309028825.

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The approximate analytical bound and scattering state solutions of the arbitrary l-wave Klein–Gordon equation for the second Pöschl–Teller like potential are carried out by a new approximation to the centrifugal term. The analytical radial wave functions of the l-wave Klein–Gordon equation with the second Pöschl–Teller like potential are presented and the corresponding energy equations for bound states and phase shifts for scattering states are derived. It is well shown that the poles of S-matrix in the complex energy plane correspond to bound states for real poles and scattering states for complex poles in the lower half of the energy plane. Some numerical results are calculated to show the improved accuracy of our results and the special case for s-wave is also studied briefly.
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31

Song, JingYu, Xuan Xie, Kanjun Sun, Mingxin Zhang, HaiKuo Lei, Hui Peng, and Guofu Ma. "Uniform nickel–cobalt nanoparticles embedded in nitrogen-doped carbon nanofibers for highly active and durable oxygen reduction electrocatalysts." New Journal of Chemistry 45, no. 18 (2021): 8210–16. http://dx.doi.org/10.1039/d0nj06191c.

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Novel nickel–cobalt bimetallic nanoparticles uniformly embedded in nitrogen-doped carbon nanofibers (NiCo@NCNFs) have been fabricated via a facile electrospinning and subsequent carbonization process, which exhibits a high half-wave potential and excellent long-term stability.
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32

HE, TIANHU, YANYAN LI, and SHUANHU SHI. "FINITE ELEMENT METHOD TO A GENERALIZED ELECTROMAGNETO-THERMOELASTIC PROBLEM WITH DIFFUSION." International Journal of Applied Mechanics 04, no. 04 (December 2012): 1250046. http://dx.doi.org/10.1142/s1758825112500469.

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In the context of the theory of generalized thermoelastic diffusion, a two-dimensional generalized electromagneto-thermoelastic problem with diffusion for a half-space is investigated. The half-space is placed in an external magnetic field with constant intensity and its bounding surface is subjected to a thermal shock and a chemical potential shock. The governing equations of the problem are formulated and solved numerically by means of finite element method. The derived finite element equations are solved directly in time domain. The nondimensional temperature, displacement, stress, chemical potential, concentration and induced magnetic field are obtained and illustrated graphically. The results show that all the considered variables have a nonzero value only in a bounded region and vanish identically outside this region, which fully demonstrates the nature of the finite speeds of thermoelastic wave and diffusive wave.
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33

SAHU, BASUDEB, Y. K. GAMBHIR, and C. S. SHASTRY. "S-MATRIX AND WAVE FUNCTION METHODS FOR THE CALCULATION OF SMALL DECAY WIDTHS." Modern Physics Letters A 25, no. 07 (March 7, 2010): 535–47. http://dx.doi.org/10.1142/s0217732310032056.

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Most of the decaying systems namely α-decay and proton radio activity have extremely narrow widths and hence are termed as quasi-bound states. There are three methods available for the computation of very narrow widths. First, the analytic S-matrix method which treats resonance as a pole in complex energy plane with its real part representing resonance energy and the imaginary part the half width. Another two methods namely (i) direct (D) method and (ii) distorted wave (DW) method are based on the property of the quasi-bound state wave function which is quite similar to a bound state wave function in the interior region and is matched with an outgoing spherical wave representing decaying behavior. We make a comparative study of these methods by applying them to the α-decay systems whose experimental results of Q-value and decay half-lives are known recently. It is observed that all the three methods give practically the same results for widths calculated at the same Q-value and explain the experimental results of Q-values and half-lives in several α-decaying nuclei quite well with a proper Coulomb nuclear interaction potential for the α+daughter nucleus system.
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34

Li, Kaili, Daohao Li, Liangkui Zhu, Zhuangzhuang Gao, Qianrong Fang, Ming Xue, Shilun Qiu, and Xiangdong Yao. "Bimetallic ZIF derived Co nanoparticle anchored N-doped porous carbons for an efficient oxygen reduction reaction." Inorganic Chemistry Frontiers 7, no. 4 (2020): 946–52. http://dx.doi.org/10.1039/c9qi01487j.

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A high-performance electrocatalytic material was derived from a new bimetallic ZIF precursor, exhibiting excellent oxygen reduction reaction performance with a half-wave potential (E1/2) of 0.849 V, superior to that of commercial Pt/C.
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35

Tran, Thai T. H., Yan-Ru Chang, Tuan K. A. Hoang, Ming-Yu Kuo, and Yuhlong O. Su. "Electrochemical Behavior of meso-Substituted Porphyrins: The Role of Cation Radicals to the Half-Wave Oxidation Potential Splitting." Journal of Physical Chemistry A 120, no. 28 (July 12, 2016): 5504–11. http://dx.doi.org/10.1021/acs.jpca.6b03538.

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36

Beltrán, Diana E., and Shawn Litster. "Half-Wave Potential or Mass Activity? Characterizing Platinum Group Metal-Free Fuel Cell Catalysts by Rotating Disk Electrodes." ACS Energy Letters 4, no. 5 (April 24, 2019): 1158–61. http://dx.doi.org/10.1021/acsenergylett.9b00790.

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37

Winter, Rainer F. "Half-Wave Potential Splittings ΔE1/2as a Measure of Electronic Coupling in Mixed-Valent Systems: Triumphs and Defeats." Organometallics 33, no. 18 (June 24, 2014): 4517–36. http://dx.doi.org/10.1021/om500029x.

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38

Castanheira, J. M., J. A. Añel, C. A. F. Marques, J. C. Antuña, M. L. R. Liberato, L. de la Torre, and L. Gimeno. "Increase of upper troposphere/lower stratosphere wave baroclinicity during the second half of the 20th century." Atmospheric Chemistry and Physics Discussions 9, no. 5 (September 9, 2009): 18597–619. http://dx.doi.org/10.5194/acpd-9-18597-2009.

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Abstract. A strengthening of the equatorward temperature gradient in the upper troposphere/lower stratosphere (UTLS), at subtropics and midlatitudes, is consistently reproduced in several modelling studies of the atmospheric response to the increase of greenhouse gas radiative forcing. Some of those studies suggest an increase of the baroclinicity in the UTLS region because of the enhanced meridional temperature gradient. This study presents observational evidence of an increase of UTLS wave baroclinicity, during the second half of the 20th century. The evidence is given by significant positive trends in the energy of baroclinic normal modes of the NCEP/NCAR reanalysis, and significant positive trends in the eddy available potential energy of the ERA-40 reanalysis as well as in the eddy available potential energy of the JRA-25 reanalysis. Significant positive trends in the frequency of double tropopause events in radiosonde data are also interpreted as a manifestation of an increase of the UTLS wave baroclinicity.
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39

Li, Ke, Shuangxi Jing, Jiangong Yu, and Bo Zhang. "Complex Rayleigh Waves in Nonhomogeneous Magneto-Electro-Elastic Half-Spaces." Materials 14, no. 4 (February 21, 2021): 1011. http://dx.doi.org/10.3390/ma14041011.

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The complex Rayleigh waves play an important role in the energy conversion efficiency of magneto-electro-elastic devices, so it is necessary to explore the wave propagation characteristics for the better applications in engineering. This paper modifies the Laguerre orthogonal polynomial to investigate the complex Rayleigh waves propagating in nonhomogeneous magneto-electro-elastic half-spaces. The improved method simplifies the calculation process by incorporating boundary conditions into the constitutive relations, shortens the solving time by transforming the solution of wave equation to an eigenvalue problem, and obtains all wave modes, including real and imaginary and complex wavenumbers. The three-dimensional curves of full frequency spectrum and phase velocities are presented for the better description of the conversion from complex Rayleigh wave modes to real wave ones; besides, the displacement distributions, electric and magnetic potential curves are obtained in thickness and propagation directions, respectively. Numerical results are analyzed and discussed elaborately in three cases: variation of nonhomogeneous coefficients, absence of magnetism, and absence of electricity. The results can be used to optimize and fabricate the acoustic surface wave devices of the nonhomogeneous magneto-electro-elastic materials.
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40

Antonov, A. M., and V. I. Erofeev. "DISTRIBUTION OF THE RAYLEIGH WAVE ALONG THE BORDER OF THE HALF-SPACE, DESCRIBED BY THE SIMPLIFIED MODEL OF THE COSSERAT." Problems of strenght and plasticity 81, no. 3 (2019): 333–44. http://dx.doi.org/10.32326/1814-9146-2019-81-3-333-344.

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We consider a simplified (reduced) dynamic model of a Cosserat medium, which occupies an intermediate position between the classical dynamic theory of elasticity and the proper Cosserat medium model, which has asymmetry in the stress tensor and the presence of moment stresses. In contrast to the latter, in the simplified model, three of the six elastic constants are zero and, as a result, there is no moment stress tensor. In the two-dimensional formulation for the model of a reduced medium, the problem of the propagation of an elastic surface wave along the half-space boundary was solved. The solution of the equations was described as the sum of the scalar and vector potentials, and only one component of the vector potential is nonzero. It is shown that such a wave, in contrast to the classical surface Rayleigh wave, has a dispersion. In the plane “phase velocity-frequency” for such waves there are two dispersion branches: the lower (acoustic) and upper (optical). With increasing frequency, the phase velocity of the wave related to the lower dispersion branch decreases. The phase velocity of the wave related to the upper dispersion branch increases with increasing frequency. The phase velocity of the surface wave in the entire frequency range exceeds the phase velocity of the bulk shear wave. The stresses and displacements arising in the zone of propagation of the surface wave are calculated.
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41

Ruiz-Morales, Juan Carlos, Jesús César Rodríguez Placeres, Manuel Barrera Niebla, and Mariana Cuesta Sánchez. "A New Method of Analysis of Polarographic Waves." Collection of Czechoslovak Chemical Communications 68, no. 6 (2003): 1055–64. http://dx.doi.org/10.1135/cccc20031055.

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A method of analysis of polarographic waves of simple electrode processes is proposed. The quasi-reversible half-wave potential, Ec1/2, is involved in the determination of thermodynamic and kinetic parameters of electrode processes. This potential is determined very easily and with great precision. In order to facilitate the use of the method proposed, we have developed a computer program for Windows.
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42

Rai, D. P., and R. K. Thapa. "A First Principle Calculation of Full-Heusler Alloy Co2TiAl: LSDA+U Method." ISRN Condensed Matter Physics 2012 (August 16, 2012): 1–5. http://dx.doi.org/10.5402/2012/410326.

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We performed the structure optimization of Co2TiAl based on the generalized gradient approximation (GGA) and linearized augmented plane wave (LAPW) method. The calculation of electronic structure was based on the full-potential linear augmented plane wave (FP-LAPW) method and local spin density approximation exchange correlation LSDA+U. We also studied the impact of the Hubbard potential or onsite Coulomb repulsion (U) on electronic structure; the values are varied within reasonable limits to study the resulting effect on the physical properties of Co2TiAl system. The calculated density of states (DOS) shows that half-metallicity of Co2TiAl decreases with the increase in U values.
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43

Nakamura, Noboru, and Clare S. Y. Huang. "Local Wave Activity and the Onset of Blocking along a Potential Vorticity Front." Journal of the Atmospheric Sciences 74, no. 7 (July 1, 2017): 2341–62. http://dx.doi.org/10.1175/jas-d-17-0029.1.

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Abstract Interaction between a train of transient waves and a diffluent westerly jet is examined using a regional quasigeostrophic equivalent barotropic model with a (nearly) binary potential vorticity (PV) distribution. Unlike most previous studies, but consistent with the observed extratropical tropopause, cross-stream variation in the layer thickness is allowed to contribute to the discontinuity in PV. In all cases examined, short (i.e., barotropic) edge waves are continuously forced in the upstream, then migrate downstream, and eventually exit the domain. A quasilinear 1D theory based on the conservation of local wave activity predicts that no steady wave train can be maintained where the westerly zonal flow is decelerated below one-half of the initial value, at which point the wave envelope develops a migratory shock analogous to the Lighthill–Whitham–Richards traffic flow problem. Fully nonlinear high-resolution 2D calculations show that the wave train indeed undergoes a significant transformation once the zonal flow along the jet axis is decelerated below the threshold. The subsequent flow evolution depends on the nature of the discontinuity in the basic-state PV. When the discontinuity is entirely due to the vorticity profile, waves are compressed and partially deflected sideways but no complete blocking occurs. When the discontinuity in PV is augmented by the layer thickness variation, the incident wave train is blocked and split into two tracks at the stagnation point, eventually leading to a formation of a modon-like vortex pair, reminiscent of an atmospheric blocking. Implications for low-frequency variability of the atmosphere are discussed.
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44

Wu, Xiaoqiang, Fuyi Chen, Nan Zhang, Adnan Qaseem, and Roy L. Johnston. "A silver–copper metallic glass electrocatalyst with high activity and stability comparable to Pt/C for zinc–air batteries." Journal of Materials Chemistry A 4, no. 9 (2016): 3527–37. http://dx.doi.org/10.1039/c5ta09266c.

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A silver–copper metallic glass (AgCu-MG) electrocatalyst has been fabricated for rechargeable zinc–air batteries by pulsed laser deposition. The AgCu-MG exceptionally enhances the ORR catalytic activity to a half-wave potential of 0.78 V vs. RHE after 1000 CV treatments in 0.1 M KOH.
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45

Shao, Y., A. A. Stewart, and H. H. Girault. "Determination of the half-wave potential of the species limiting the potential window. Measurement of gibbs transfer energies at the water/1,2-dichloroethane interface." Journal of the Chemical Society, Faraday Transactions 87, no. 16 (1991): 2593. http://dx.doi.org/10.1039/ft9918702593.

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46

Patil, S. H. "Hydrogenic System In Half Space." Zeitschrift für Naturforschung A 59, no. 7-8 (August 1, 2004): 455–66. http://dx.doi.org/10.1515/zna-2004-7-808.

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Some structural properties of the energy eigenfunctions of a hydrogenic system in half space, are analysed. Specifically, we have obtained the asymptotic behaviour when the electron is far away from the nucleus, the coalescence property when it is close to the nucleus, the inflection property when it is close to the potential barrier, the property when the nucleus is far away from the barrier, and a virial relation. Simple model wave functions are developed, incorporating these properties which give accurate values for the energies and some other physical quantities, and give a useful understanding of the physical structure of the system.
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47

Abd-alla, Abo-el-nour N., N. F. Hasbullah, and Hala M. Hossen. "The Frequency Equations for Shear Horizontal Waves in Semiconductor/Piezoelectric Structures Under the Influence of Initial Stress." Journal of Computational and Theoretical Nanoscience 13, no. 10 (October 1, 2016): 6475–81. http://dx.doi.org/10.1166/jctn.2016.5589.

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In this paper, we investigated analytically the frequency equations for shear horizontal wave propagation in a piezoelectric half space covered by a semiconductor film with initial stress effect. The semiconducting layer is influenced by initial stress and the interface between the piezoelectric substrate and the semiconductor layer. The governing equations of the mechanical displacement and electrical potential function under the effect of initial stress are obtained by solving the coupled electromechanical field equations of the piezoelectric half-space and the semiconductor film. Next, the numerical examples are presented to illustrate the influence of initial stress and electromagnetic boundary conditions for the different values of the film thickness and wave number. Furthermore, we studied in more details the effect of initial stress on the frequency equation for piezoelectric Barium Titanate (BaTiO3) and semiconductor silicon. The obtained results provide a predictable and theoretical basis for applications of piezoelectric and semiconductor composites to acoustic wave devices.
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48

Kubenko, V. D. "On the determination of the wave potential of a vibrating spherical particle in a half-infinite cylinder with liquid." Reports of the National Academy of Sciences of Ukraine, no. 9 (September 14, 2017): 41–47. http://dx.doi.org/10.15407/dopovidi2017.09.041.

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49

Liu, Huitao, Yingying Wen, Feng Luan, Yuan Gao, and Xiuyong Li. "QSPR study for the prediction of half-wave potentials of benzoxazines by heuristic method and radial basis function neural network." Open Chemistry 7, no. 3 (September 1, 2009): 439–45. http://dx.doi.org/10.2478/s11532-009-0033-z.

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AbstractThe half-wave potential (E1/2) is an important electrochemical property of organic compounds. In this work, a quantitative structure-property relationship (QSPR) analysis has been conducted on the half-wave reduction potential (E1/2) of 40 substituted benzoxazines by means of both a heuristic method (HM) and a non-linear radial basis function neural network (RBFNN) modeling method. The statistical parameters provided by the HM model (R2 =0.946; F=152.576; RMSCV=0.0141) and the RBFNN model (R2=0.982; F=1034.171 and RMS =0.0209) indicated satisfactory stability and predictive ability. The obtained models showed that benzoxazines with larger Min valency of a S atom (MVSA), lower Relative number of H atom (RNHA) and Min n-n repulsion for a C-H bond (MnnRCHB) and Minimal Electrophilic Reactivity Index for a C atom (MERICA) can be more easily reduced. This QSPR approach can contribute to a better understanding of structural factors of the organic compounds that contribute to the E1/2, and can be useful in predicting the E1/2 of other compounds.
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50

Tang, Jie, Long-De Wang, Ruo-Zhou Li, Qiang Zhang, and Tong Zhang. "Low half-wave voltage Y-branch electro-optic polymer modulator based on side-chain polyurethane-imide." Modern Physics Letters B 30, no. 17 (June 30, 2016): 1650228. http://dx.doi.org/10.1142/s0217984916502286.

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A Y-branch electro-optic (EO) polymer modulator has been designed and fabricated. High performance side-chain polyurethane-imide (PUI) with a high EO coefficient of larger than 50 pm/V and a moderate glass-transition temperature [Formula: see text] of 206[Formula: see text]C is used as EO polymer core layer of the modulator. The fabricated phase modulator exhibits a low half-wave voltage of 1.94 V at 1550 nm in single arm modulation with 1 cm EO interaction length and 2 cm total length. The results show that the modulator fabricated by side-chain PUI EO materials possesses potential applications in low driving voltage and low cost optical systems.
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