Physical Sciences and Technology最新文献_第5页

Calculation of ionization and runaway electrons characteristics in helium with iron vapor 氦与铁蒸气中电离和失控电子特性的计算

Physical Sciences and Technology Pub Date : 2020-05-17 DOI: 10.26577/phst.2020.v7.i1.02

R. Golyatina, S. Maiorov, G. B. Raghimkhanov, Z. Khalikova

引用次数: 0

Simple, contrast based, compartmentalization in 3D reconstruction from CT images 简单，基于对比度的CT图像三维重建分区

Physical Sciences and Technology Pub Date : 2020-05-17 DOI: 10.26577/phst.2020.v7.i1.06

A. Kussainov, N. Saduev, M. Em, M. Mukhatay, Y. Myrzabek

{"title":"Simple, contrast based, compartmentalization in 3D reconstruction from CT images","authors":"A. Kussainov, N. Saduev, M. Em, M. Mukhatay, Y. Myrzabek","doi":"10.26577/phst.2020.v7.i1.06","DOIUrl":"https://doi.org/10.26577/phst.2020.v7.i1.06","url":null,"abstract":"We are interested in different procedures and techniques to preprocess and postprocess the data in computedtomography reconstruction methods to achieve the better contrast, resolution or other types of the functionalanalysis of the data. We report the straightforward application of the imaging artifacts treating technique,that is the elimination of the overexposure artifact due to the presence of the metal object, for producingthe elementary image compartmentalization results with the artificial bone sample CT data. Thus, the highabsorption artifacts removal technique is given the complimentary function of the structural analysis andrevealing the metal pins scaffolding skeleton. The basic multilevel thresholding is used to reveal thetargeted structures. The results could be extremely useful for the noisy, unfiltered X-ray source, single rundata sets. The data have been supplied by the homemade CT scanner assembly and processed with thecustom reconstruction software developed specifically for this setup. OpenCV package tools for the C/C++libraries compiled with the MS Visual Studio IDE compiler were extensively used.","PeriodicalId":321102,"journal":{"name":"Physical Sciences and Technology","volume":"126 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134097285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Symplectic coherent-state bases in the OCM calculations of nuclear cluster systems 核团系OCM计算中的辛相干态基

Physical Sciences and Technology Pub Date : 2020-05-17 DOI: 10.26577/phst.2020.v7.i1.07

K. Katō, V. Vasilevsky, N. Takibayev

引用次数: 0

Feasibility study of Tritium recoil barrier forneutron reflectors 中子反射器用氚反冲势垒的可行性研究

Physical Sciences and Technology Pub Date : 2019-12-26 DOI: 10.26577/phst-2019-2-p8

E. Ishitsuka, N. Sakamoto

引用次数: 1

Polymorphic phase transitions and recombination luminescence in ammonium halide crystals 卤化铵晶体的多态相变与复合发光

Physical Sciences and Technology Pub Date : 2019-12-26 DOI: 10.26577/phst-2019-2-p10

T. A. Koketayev, A. Tussupbekova

{"title":"Polymorphic phase transitions and recombination luminescence in ammonium halide crystals","authors":"T. A. Koketayev, A. Tussupbekova","doi":"10.26577/phst-2019-2-p10","DOIUrl":"https://doi.org/10.26577/phst-2019-2-p10","url":null,"abstract":"Spectral-luminescent properties of ammonium halide crystals were studied in this work. The properties of the peak of thermally stimulated luminescence (TSL) in the region of the phase transition temperature were studied and the basic laws were established. A sequential thermal annealing isolated the TSL peak with a maximum at 240 K for ammonium chloride activated with rare-earth ions (RI). It was found that an order-disorder phase transition occurs for activated RI of ammonium chloride at a temperature of 240 K. An appearance of TSL peak with a maximum at 240 K causes because of exposure to ionizing radiation upon activation of ammonium halides by thallium and tin ions. This phenomenon is observed when ammonium halides are activated by europium, ytterbium, neodymium, praseodymium, copper, cadmium and potassium ions. The introduction of impurity homologous anions into the crystal lattice does not give a similar effect. Therefore, it can be argued that observed phenomenon is associated with the presence of impurities in the cationic sublattice and its appearance does not depend on the parameters of the impurity center. On the one hand, the TSL peak is not impurity, since its position is determined by the properties of matrix and on the other hand, its appearance is associated only with substitution ions in the cationic sublattice. The obtained results allow studying the crystals response under exposition to ionizing radiation.","PeriodicalId":321102,"journal":{"name":"Physical Sciences and Technology","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129239090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of Cu impurities and surface temperature to the formation of thin a-C:H(Me) film Cu杂质和表面温度对a-C:H(Me)薄膜形成的影响

Physical Sciences and Technology Pub Date : 2019-12-26 DOI: 10.26577/phst-2019-2-p9

Ž. Rutkūnienė

{"title":"Influence of Cu impurities and surface temperature to the formation of thin a-C:H(Me) film","authors":"Ž. Rutkūnienė","doi":"10.26577/phst-2019-2-p9","DOIUrl":"https://doi.org/10.26577/phst-2019-2-p9","url":null,"abstract":"The aim of this experimental work is identify most important physical and chemical processes on the surface during amorphous carbon films formation on the silicon surface with copper nanoclusters (Cu). Duration of films deposition on n type silicon (100) surface by using different substrate temperatures (25 °C, 100 oC and 250 °C) was 45s. Velocity of film growth from C 2 H 2 gas plasma depended on surface temperature and was variable (0.2-0.5 nm/s). Data of null ellipsometry, Raman spectroscopy and element analysis showed that formation of amorphous carbon film is in the early stage and mixture of Si-C, Si-COH and GLC fragments is dominant on the surface. The experimental RS curves were fitted by few Gaussian-shape lines in the spectral range from 500 cm -1 to 700 cm -1 , from 700 cm -1 to 900 cm -1 , from 900 cm -1 to 1100 cm -1 and from 1100 cm -1 to 1900 cm -1 and analysis of the additional peaks in all ranges confirmed complexes of different carbons structures in the film. Carbon films with more ordered C-C bonds grows during film formation at higher temperatures (>100 o C) on the silicon surface with Cu particles, because atoms of copper penetrate into the deeper layers of silicon. The substrate temperature influenced the surface amorphisation because of active oxygen and hydrogen diffusion into deeper layers and formation of hydrogenated silicon carbon with fragments of amorphous carbon films becomes not significant.","PeriodicalId":321102,"journal":{"name":"Physical Sciences and Technology","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124973258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Generation of ultrahigh fields by microbubble implosion 微泡内爆产生超高场

Physical Sciences and Technology Pub Date : 2019-12-26 DOI: 10.26577/phst-2019-2-p4

M. Murakami, A. Arefiev, M. A. Zosa, J. Honrubia

{"title":"Generation of ultrahigh fields by microbubble implosion","authors":"M. Murakami, A. Arefiev, M. A. Zosa, J. Honrubia","doi":"10.26577/phst-2019-2-p4","DOIUrl":"https://doi.org/10.26577/phst-2019-2-p4","url":null,"abstract":"Breaking the 100-MeV barrier for proton acceleration will help elucidate fundamental physics and advancepractical applications from inertial confinement fusion to tumor therapy. A novel concept of “microbubbleimplosion (MBI)” is proposed. In the MBI concept, bubble implosion combines micro-bubbles and ultraintenselaser pulses of 1020 – 1022 Wcm-2 to generate ultrahigh fields and relativistic protons. The bubblewall protons are subject to volumetric acceleration toward the center due to the spherically symmetricelectrostatic force generated by hot electrons filling the bubble. Such an implosion can generate an ultrahighdensity proton core of nanometer size on the collapse, which results in an ultrahigh electrostatic field toemit energetic protons in the relativistic regime. Laser intensity scaling is investigated for acceleratedproton energy and attainable electrostatic field using MBI. Three-dimensional particle-in-cell andmolecular dynamics simulations are conducted in a complementary manner. As a result, underlying physicsof MBI are revealed such as bubble-pulsation and ultrahigh energy densities, which are higher by orders ofmagnitude than, for example, those expected in a fusion-igniting core of inertially confined plasma. MBIhas potential as a plasma-optical device, which optimally amplifies an applied laser intensity by a factor oftwo orders of magnitude; thus, MBI is proposed to be a novel approach to the Schwinger limit.","PeriodicalId":321102,"journal":{"name":"Physical Sciences and Technology","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127717844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantum methods in the development of new materials 新材料开发中的量子方法

Physical Sciences and Technology Pub Date : 2019-12-26 DOI: 10.26577/phst-2019-2-p1

E. Son, I. Abrikosov, A. Khvan, P. Levashov

引用次数: 0

Simulation of Coulomb particles collisions and calculation of Lyapunov exponent for bound orbits 库仑粒子碰撞模拟及束缚轨道Lyapunov指数计算

Physical Sciences and Technology Pub Date : 2019-12-26 DOI: 10.26577//phst-2019-2-p2

K. Turekhanova, A. Murat

引用次数: 0

On distribution function of free and bound electrons in equilibrium Coulomb system 平衡库仑系统中自由电子和束缚电子的分布函数

Physical Sciences and Technology Pub Date : 2019-07-30 DOI: 10.26577/phst-2019-1-p1

S. Maiorov, А.L. Khomkin

引用次数: 0