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Positronium Annihilation in Freshly Defrosted Thawed Water 刚解冻的解冻水中正电子湮灭
IF 1.4 4区 物理与天体物理
Physics of Wave Phenomena Pub Date : 2023-05-02 DOI: 10.3103/S1541308X23020115
L. I. Zemskaya, O. V. Ilyukhina, M. V. Karpov, S. V. Stepanov
{"title":"Positronium Annihilation in Freshly Defrosted Thawed Water","authors":"L. I. Zemskaya,&nbsp;O. V. Ilyukhina,&nbsp;M. V. Karpov,&nbsp;S. V. Stepanov","doi":"10.3103/S1541308X23020115","DOIUrl":"10.3103/S1541308X23020115","url":null,"abstract":"<p>Variation in the parameters of the positron annihilation lifetime spectra in pure water presubjected to freeze–thaw processes is studied. It is shown that in freshly defrosted water (at 1–2°С), the ortho-positronium lifetime and formation probability tend to the corresponding values in ice (near its melting point), and after about 10 h they reach the values corresponding to ordinary water at the same temperature. It indicates that no complete (at molecular level) defragmentation of the ice lattice occurs immediately after ice melting, and rigid ice-like clusters, in which positronium formation is also possible remain in the liquid phase for several hours.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"31 2","pages":"105 - 109"},"PeriodicalIF":1.4,"publicationDate":"2023-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4098419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Laser Synthesis of Gold Nanochains from Hydrochloroauric Acid Aqueous Solutions 激光合成氢氯金酸水溶液中的金纳米链
IF 1.4 4区 物理与天体物理
Physics of Wave Phenomena Pub Date : 2023-03-27 DOI: 10.3103/S1541308X23010016
K. K. Ashikkalieva, V. V. Kononenko, N. R. Arutyunyan, E. V. Akhlyustina, E. V. Zavedeev, A. L. Vasiliev, A. L. Golovin, V. I. Konov
{"title":"Laser Synthesis of Gold Nanochains from Hydrochloroauric Acid Aqueous Solutions","authors":"K. K. Ashikkalieva,&nbsp;V. V. Kononenko,&nbsp;N. R. Arutyunyan,&nbsp;E. V. Akhlyustina,&nbsp;E. V. Zavedeev,&nbsp;A. L. Vasiliev,&nbsp;A. L. Golovin,&nbsp;V. I. Konov","doi":"10.3103/S1541308X23010016","DOIUrl":"10.3103/S1541308X23010016","url":null,"abstract":"<p>The dynamics of the reduction of hydrochloroauric acid (HAuCl<sub>4</sub>) aqueous solutions and the formation and disintegration of gold nanoparticles under high-intensity irradiation by Ti׃Al<sub>2</sub>O<sub>3</sub> laser pulses (τ = 130 fs, <i>f</i> = 1 kHz, <i>N</i> = 6 × 10<sup>4</sup>–3 × 10<sup>6</sup> pulses, average radiation power of 0.8 W) has been investigated by optical absorption spectroscopy. This high-intensity irradiation is found to cause formation (both during irradiation and after it), along with single gold nanoparticles several ten nanometers in diameter, elongated (chain) submicron structures, consisting of individual nanoelements of different shape. Specific features of the mechanisms of formation and evolution of nanostructures, caused by the multiphoton ionization of a liquid, its heating, and modification of nanostructures as a result of intense impact of an ultrashort laser pulse, as well as liquid heating by radiation with a high average power, are discussed.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"31 1","pages":"44 - 50"},"PeriodicalIF":1.4,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5054222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synthetic Opals in Laser-Induced Breakdown Spectroscopy Problems 激光诱导击穿光谱中的合成蛋白石问题
IF 1.4 4区 物理与天体物理
Physics of Wave Phenomena Pub Date : 2023-03-27 DOI: 10.3103/S1541308X23010077
A. V. Skrabatun, S. F. Umanskaya, M. A. Shevchenko, A. A. Matrokhin, A. N. Maresev, N. V. Tcherniega
{"title":"Synthetic Opals in Laser-Induced Breakdown Spectroscopy Problems","authors":"A. V. Skrabatun,&nbsp;S. F. Umanskaya,&nbsp;M. A. Shevchenko,&nbsp;A. A. Matrokhin,&nbsp;A. N. Maresev,&nbsp;N. V. Tcherniega","doi":"10.3103/S1541308X23010077","DOIUrl":"10.3103/S1541308X23010077","url":null,"abstract":"<p>Laser-induced breakdown spectroscopy (LIBS) is first used to identify small impurity amounts in a three-dimensional ordered submicron dielectric structure exemplified by a synthetic opal matrix (SOM). A possibility of detecting metal-containing substances infiltrated in a SOM is demonstrated. The effect of the photonic bandgap and the excitation wavelength on the LIBS spectrum is shown.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"31 1","pages":"51 - 58"},"PeriodicalIF":1.4,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5052683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical Simulation Method for Prediction of HIFU Induced Lesions in Human Tissue: FDTD-LBM 预测HIFU诱导人体组织病变的数值模拟方法:FDTD-LBM
IF 1.4 4区 物理与天体物理
Physics of Wave Phenomena Pub Date : 2023-03-27 DOI: 10.3103/S1541308X2301003X
S.-J. Kim, J.-Y. Hwang, Y.-J. Kim, K.-N. Pae
{"title":"Numerical Simulation Method for Prediction of HIFU Induced Lesions in Human Tissue: FDTD-LBM","authors":"S.-J. Kim,&nbsp;J.-Y. Hwang,&nbsp;Y.-J. Kim,&nbsp;K.-N. Pae","doi":"10.3103/S1541308X2301003X","DOIUrl":"10.3103/S1541308X2301003X","url":null,"abstract":"<p>High-intensity focused ultrasound (HIFU) is a therapy method to treat the tumors in prostate, liver, kidney, pancreas, bone, breast, and uterine fibroids. In the HIFU therapy process, the ultrasound generated in an ultrasonic transducer concentrates on a focal zone. At the zone, the temperature rises locally up to 56°C to provoke the necrosis of human tissue. Therefore, to control the therapy process, it is essential to perceive the main principle of heat generation in human tissue. We study FDTD-LBM (finite difference time domain—lattice Boltzmann method) as a method of predicting the temperature distribution in human tissue during HIFU therapy. The nonlinear Westervelt wave equation is employed for computing the pressure distribution in human tissue during ultrasound propagation, while the Pennes bio-heat transfer equation is used for calculating the temperature distribution in the tissue. Finite difference time domain (FDTD) is applied to solving the nonlinear Westervelt wave equation, and the lattice Boltzmann method can solve the Pennes bio-heat transfer equation. Simulation results have shown that the numerical simulation method proposed has improved the accuracy in analyzing the temperature field in human tissue.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"31 1","pages":"30 - 35"},"PeriodicalIF":1.4,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5054233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Simulation of Acoustical Field of Ballistic Shock Therapy Device by the Lattice Boltzmann Method 用晶格玻尔兹曼方法模拟弹道冲击治疗装置的声场
IF 1.4 4区 物理与天体物理
Physics of Wave Phenomena Pub Date : 2023-03-27 DOI: 10.3103/S1541308X23010053
K.-N. Pae, Y.-J. Kim, W.-J. Kim, S.-J. Kim
{"title":"Simulation of Acoustical Field of Ballistic Shock Therapy Device by the Lattice Boltzmann Method","authors":"K.-N. Pae,&nbsp;Y.-J. Kim,&nbsp;W.-J. Kim,&nbsp;S.-J. Kim","doi":"10.3103/S1541308X23010053","DOIUrl":"10.3103/S1541308X23010053","url":null,"abstract":"<p>The pressure field distribution of a ballistic shock wave (BSW) therapy device is a crucial factor for clarifying its treatment mechanism. We developed a lattice Boltzmann model (LBM) to describe the propagation of BSW. Based on the assumption that the propagation of BSW causes weak compressible flow, our simulaton was performed by coupling Tait equation of state. For a two-dimensional LBM, we used the density initial condition for initial turbulent region near the applicator. We first compared our simulation results with previous experimental measurements. Then we predicted the temporal and spatial distribution of pressure field. The pressure field of ballistic shock wave has a primary compressive region followed by a primary expansive region with the other disturbances. A secondary pressure pulse consists of a positive phase followed by a negative phase. Our results agree well with previous experimental data and provide additional data on the pressure field of BSW. Our model encourages further investigation to clear the biological mechanism of BSW therapy and to design more effective device.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"31 1","pages":"36 - 43"},"PeriodicalIF":1.4,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5054208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Particle Concentration Measurements during Fast Recording of Absorption Spectra 吸收光谱快速记录中粒子浓度的测量
IF 1.4 4区 物理与天体物理
Physics of Wave Phenomena Pub Date : 2023-03-27 DOI: 10.3103/S1541308X23010089
A. I. Volkova, V. V. Lagunov, V. N. Ochkin
{"title":"Particle Concentration Measurements during Fast Recording of Absorption Spectra","authors":"A. I. Volkova,&nbsp;V. V. Lagunov,&nbsp;V. N. Ochkin","doi":"10.3103/S1541308X23010089","DOIUrl":"10.3103/S1541308X23010089","url":null,"abstract":"<div><div><h3>\u0000 <b>Abstract</b>—</h3><p>The applicability of the light absorption method for measuring particle concentrations during fast recording of absorption spectra in different ranges of frequency tuning rates and in different measurement schemes has been considered. If the molecular resonance time is shorter than the decay times of induced particle polarization in the open space of the medium, scanning of the transmission radiation frequency is accompanied by well-known transient coherent effects, the stationary spectrum is distorted, and oscillations arise. In this case the conventional total absorption methods can hardly be applied directly. A method based on reconstructing the stationary spectrum from the wing of the experimentally observed absorption line is proposed. When carrying out highly sensitive measurements of absorption in the medium inside of a high-<i>Q</i> external optical cavity, absorption line distortions arise as well, but at much lower frequency tuning rates. The observed spectra exhibit asymmetry, oscillations are not observed, and the violation mechanism is related in this case to the limitation of the probe-light coherence length (in comparison with the effective optical path length) and finite photon lifetime in the cavity. It is shown that direct application of the classical relations linking the total absorption with the particle concentration yields adequate results in this situation. The role of instrumental distortions in integral measurements is discussed.</p></div></div>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"31 1","pages":"1 - 14"},"PeriodicalIF":1.4,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5488544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Holographic Processing of Electrocardiograms 心电图全息处理
IF 1.4 4区 物理与天体物理
Physics of Wave Phenomena Pub Date : 2023-03-27 DOI: 10.3103/S1541308X23010065
N. P. Stadnaya, S. P. Lukinskikh, S. A. Pereselkov, A. S. Pereselkov, V. M. Kuz’kin
{"title":"Holographic Processing of Electrocardiograms","authors":"N. P. Stadnaya,&nbsp;S. P. Lukinskikh,&nbsp;S. A. Pereselkov,&nbsp;A. S. Pereselkov,&nbsp;V. M. Kuz’kin","doi":"10.3103/S1541308X23010065","DOIUrl":"10.3103/S1541308X23010065","url":null,"abstract":"<p>Holographic processing of electrocardiograms is proposed on the basis of the windowed Fourier transform of the electrocardiosignal that converts it from the time representation to the frequency–time representation, to the modulus squared of which the two-dimensional frequency–time Fourier transform is applied. At the integrated transformation output the spectral density of the signal is localized in the form of focal spots containing information on the temporal distribution of spectral densities of separate waves in the electrocardiogram. Experimental results of holographic processing of electrocardiograms are presented, which are obtained for patients with a normal heart and with congestive heart failure.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"31 1","pages":"21 - 29"},"PeriodicalIF":1.4,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5049411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dynamic Stimulated Low-Frequency Light Scattering in a Nanodispersed Liquid Medium 纳米分散液体介质中的动态受激低频光散射
IF 1.4 4区 物理与天体物理
Physics of Wave Phenomena Pub Date : 2023-03-27 DOI: 10.3103/S1541308X23010028
A. F. Bunkin, M. A. Davydov, V. G. Mikhalevich, V. N. Streltsov, A. N. Fedorov, S. M. Pershin
{"title":"Dynamic Stimulated Low-Frequency Light Scattering in a Nanodispersed Liquid Medium","authors":"A. F. Bunkin,&nbsp;M. A. Davydov,&nbsp;V. G. Mikhalevich,&nbsp;V. N. Streltsov,&nbsp;A. N. Fedorov,&nbsp;S. M. Pershin","doi":"10.3103/S1541308X23010028","DOIUrl":"10.3103/S1541308X23010028","url":null,"abstract":"<p>For the first time, stimulated dynamic scattering of a light wave in a liquid nanodispersed medium is observed, which is caused by phase modulation of the dipole moment of the suspension nanoparticles subjected to acoustically induced vibrations in the electromagnetic field. Experiments have been carried out in an aqueous suspension of amorphous silicon dioxide SiO<sub>2</sub> nanospheres ≈100 and ≈350 nm in diameter under stimulated scattering excited by the second-harmonic radiation of the pulsed single-mode Nd<sup>3+</sup>:YAG laser. In addition to the first Stokes component of the stimulated Brillouin scattering with the frequency shift Ω typical of a solvent, a scattering line with the frequency shift ≈2Ω is observed in full agreement with the theory developed in the work.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"31 1","pages":"15 - 20"},"PeriodicalIF":1.4,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5049414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of the Metal–Nonmetal Transition on the Pressure Pulse in Laser Ablation of Mercury 金属-非金属转变对激光烧蚀汞压力脉冲的影响
IF 1.4 4区 物理与天体物理
Physics of Wave Phenomena Pub Date : 2023-01-09 DOI: 10.3103/S1541308X22060061
A. A. Samokhin, P. A. Pivovarov
{"title":"Effect of the Metal–Nonmetal Transition on the Pressure Pulse in Laser Ablation of Mercury","authors":"A. A. Samokhin,&nbsp;P. A. Pivovarov","doi":"10.3103/S1541308X22060061","DOIUrl":"10.3103/S1541308X22060061","url":null,"abstract":"<p>The quasi-stationary regime of laser metal ablation is investigated within a model with two density variation fronts arising from the density decrease in the bleaching wave with the preceding compression shock wave. The investigation allows qualitatively describing features of recoil pressure behavior recently observed in laser ablation of mercury, which are associated with occurrence of an additional pressure peak and a decrease in the time of arrival of the pressure signal at the sensor from the irradiated target. It is shown that the results of this approach are not in conflict with the available data on the shock compression of mercury.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"30 6","pages":"364 - 369"},"PeriodicalIF":1.4,"publicationDate":"2023-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4386235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optical Loss in Copper-Coated Multimode Optical Fibers of Different Diameters 不同直径铜包覆多模光纤的光损耗
IF 1.4 4区 物理与天体物理
Physics of Wave Phenomena Pub Date : 2023-01-09 DOI: 10.3103/S1541308X22060036
M. I. Bulatov, N. S. Grigoriev, A. F. Kosolapov, S. L. Semjonov
{"title":"Optical Loss in Copper-Coated Multimode Optical Fibers of Different Diameters","authors":"M. I. Bulatov,&nbsp;N. S. Grigoriev,&nbsp;A. F. Kosolapov,&nbsp;S. L. Semjonov","doi":"10.3103/S1541308X22060036","DOIUrl":"10.3103/S1541308X22060036","url":null,"abstract":"<p>Dependence of the initial optical loss in copper-coated silica–silica multimode optical fibers on the external fiber diameter and the optical cladding thickness is investigated. The results allow a conclusion that the best parameters in the long-wavelength spectrum region will be shown by copper-coated silica–silica multimode optical fibers with the diameter larger than 160 µm and the ratio of the optical cladding thickness to the working radiation wavelength larger than 6.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"30 6","pages":"397 - 400"},"PeriodicalIF":1.4,"publicationDate":"2023-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4384170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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