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2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)最新文献

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Estimation of time Parameters of Coal Particle Combustion in Air Flow under Thermal Radiation 热辐射作用下气流中煤颗粒燃烧时间参数的估计
Pub Date : 2020-09-14 DOI: 10.1109/EFRE47760.2020.9242108
A. Ponomareva, K. Tcoi, K. Shtym
In this work, thermal behavior and combustion properties of a coal dust of Pavlovskiy brown coal were studied. The investigation was focused on the estimation of time parameters of fine coal particle combustion using the data obtained during the experiments on the constructed laboratory-made setup. The advantage of the constructed laboratory setup is that the experimental conditions are as close as possible to the conditions of the existing boiler units. In such conditions a significant part of the heat flow in the combustion chamber is supplied to the fuel in the form of radiant energy, in contrast to many experimental installations where convection heating is occurred. Experimental research parameters were applied for theoretical and numerical investigation. Calculated time parameters, such as heating-up time, yield and burning time of volatile, and burning time of char were compared with experimental data. Preliminary analysis of our experimental results on combustion of fine coal particles demonstrates that empirical equations for simulation of time-depended coal combustion process can provide reasonable agreement with experimental data.
对巴甫洛夫褐煤煤粉的热行为和燃烧特性进行了研究。研究了在自制实验装置上利用实验数据对细粒煤燃烧时间参数的估计。所建实验室装置的优点是实验条件尽可能接近现有锅炉机组的条件。在这种情况下,燃烧室中很大一部分热流以辐射能的形式提供给燃料,这与许多发生对流加热的实验装置不同。采用实验研究参数进行理论和数值研究。计算的时间参数,如加热时间、挥发分产率和燃烧时间、焦炭燃烧时间,与实验数据进行了比较。对细粒煤燃烧实验结果的初步分析表明,煤燃烧过程随时间变化的经验方程与实验数据吻合较好。
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引用次数: 0
Velocity Distribution Around an Isolated Dust Particle 孤立尘埃粒子周围的速度分布
Pub Date : 2020-09-14 DOI: 10.1109/EFRE47760.2020.9242052
M. Salnikov, G. Sukhinin
This paper presents a numerical model in which selfconsistent distributions of plasma space charge, ion velocity and potential are calculated in the proximity of an isolated spherical dust particle. In the presented model this dust particle is under the influence of an external electric field. As a result of calculation spatial distribution of ions radial velocity around the isolated dust particles is obtained, as well as the ion velocity distribution function along an axis aligned with the vector of the external electric field. The obtained results make it possible to establish the intervals of parameters (i.e., the electric field strength, the ion mean free path, and the distance between the ion and the dust particle) within the boundaries of which the approximation that the ion velocity distribution function coincides with the shifted Maxwell distribution is correct.
本文提出了一个计算等离子体空间电荷、离子速度和电势在孤立球形尘埃粒子附近自洽分布的数值模型。在所提出的模型中,这种尘埃粒子受到外电场的影响。计算结果得到了离子在被隔离尘埃粒子周围径向速度的空间分布,以及沿与外电场矢量对齐的轴方向的离子速度分布函数。得到的结果可以建立参数(即电场强度、离子平均自由程和离子与尘埃粒子之间的距离)的区间,在该区间内离子速度分布函数与移位的麦克斯韦分布重合的近似是正确的。
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引用次数: 0
A New Method for the Synthesis of Coatings of HA-Gelatin on Titanium 合成ha -明胶钛膜的新方法
Pub Date : 2020-09-14 DOI: 10.1109/EFRE47760.2020.9242072
O. Golovanova
The paper discusses an alternative method - the synthesis of biomimetic composite coatings on a titanium alloy. With this method of obtaining materials, the bond of the implant with the bone develops due to the biomimetic formation of an active layer of hydroxyapatite on the surface of the titanium alloy. This layer is formed as a result of the transition of calcium ions from the implant material into the intercellular fluid, the composition of which is similar, for example, to the composition of the simulated human body fluid. In this study, we tried to synthesize a biomimetic composite based on a gelatin-calcium-phosphate coating on a titanium alloy VT1-0 and determine its structure, composition, and physicochemical properties. Synthesis of composite coatings on titanium alloy implants consisting of hydroxyapatite powder and 1%, 2% and 3% gelatin was conducted. The samples of titanium implants were immersed in the hydroxyapatite suspension with the addition of gelatin, while the pH value was 7.4, which corresponds to physiological. In the study, a titanium alloy of the VT1-0 grade was used, and its surface was preliminarily subjected to processing: it was polished, etched, and exposed to a powerful ion beam. The XRD data showed that samples synthesized in simulated body solution at different concentrations of gelatin are single-phase and represent hydroxyapatite. It has been established that the crystallization rate depends on the method of pretreatment of the titanium implant surface. A faster growth of crystals was observed on thin sections of polished specimens, while on etched specimens, dendritic growth occurred in bulk defects caused by etching. The consolidation of the composite layer was observed after exposure to a powerful ion beam.
本文讨论了一种替代方法——在钛合金表面合成仿生复合涂层。通过这种获得材料的方法,由于钛合金表面羟基磷灰石活性层的仿生形成,植入物与骨的结合得以发展。这一层是由于钙离子从植入材料过渡到细胞间液而形成的,细胞间液的组成类似于模拟人体体液的组成。在本研究中,我们试图在钛合金VT1-0上合成一种基于明胶-磷酸钙涂层的仿生复合材料,并测定其结构、组成和理化性质。制备了羟基磷灰石粉末和1%、2%、3%明胶在钛合金种植体上的复合涂层。将钛种植体样品浸泡在加入明胶的羟基磷灰石悬浮液中,pH值为7.4,符合生理要求。本研究采用了VT1-0级钛合金,对其表面进行了初步的加工:抛光、蚀刻、强离子束照射。XRD数据表明,在不同明胶浓度的模拟体溶液中合成的样品均为单相,为羟基磷灰石。结果表明,钛种植体的结晶速率与钛种植体表面的预处理方法有关。在抛光试样的薄片上观察到晶体生长更快,而在蚀刻试样上,由于蚀刻引起的大块缺陷中出现了枝晶生长。在强离子束照射下观察到复合材料层的固结。
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引用次数: 0
Shunting Z-Pinch by Load by Plasma Switch Installed in a Magnetically Isolated Transmission Line 安装在磁隔离传输线上的等离子体开关按负载分流z -箝位
Pub Date : 2020-09-14 DOI: 10.1109/EFRE47760.2020.9241936
V. Kokshenev
A planar plasma source based on a high-current discharge in a dielectric capillary has been created, which allows the formation of high-speed plasma flows with a density of at least 10−7g/cm3. Using a metal plasma duct, a uniform planar flow was obtained, having a speed of $9 text{cm}/ mumathrm{s}$ and an angle of opening of the plasma jet of ∼ 20°. A switch based on the created planar plasma source made it possible to implement a controlled mode of shunting the inductive load with a mega-ampere current from the discharge circuit of the primary energy storage device.
基于介质毛细管中大电流放电的平面等离子体源已经被创建,它允许形成密度至少为10−7g/cm3的高速等离子体流。利用金属等离子体管道,获得了均匀的平面流,速度为$9 text{cm}/ mu mathm {s}$,等离子体射流的开口角为~ 20°。基于所创建的平面等离子体源的开关使得实现从初级储能装置的放电电路中以兆安培电流分流感应负载的控制模式成为可能。
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引用次数: 0
Comparative Studies of the Irradiation Effects of ZrWN Coating with Helium and Krypton Ions at Low and High Temperatures 低温和高温下氦、氪离子ZrWN涂层辐照效果的比较研究
Pub Date : 2020-09-14 DOI: 10.1109/EFRE47760.2020.9242161
S. Kislitsin, A. Potekaev, T. Aldabergenova, A. Klopotov
The effect of irradiation with low-energy helium and krypton ions on the surface structure, hardness, and corrosion resistance of ZrWN coatings was studied. Magnetron sputtering was used to form ZrWN coatings on structural steel substrates. Irradiation was carried out at room temperature and 600 °C. It was shown that the structure and properties of coatings degrade under irradiation with helium and krypton ions. Irradiation temperature affects the degree of degradation – with increasing temperature, corrosion resistance and strength characteristics of the coating decrease.
研究了低能氦离子和氪离子辐照对ZrWN涂层表面结构、硬度和耐蚀性的影响。采用磁控溅射技术在结构钢基体上制备ZrWN涂层。在室温和600℃下进行辐照。结果表明,在氦离子和氪离子的照射下,涂层的结构和性能会发生降解。辐照温度影响降解程度——随着温度的升高,涂层的耐腐蚀性和强度特性降低。
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引用次数: 0
Pentamode Metamaterials under Dynamic Loading 动态加载下的五模超材料
Pub Date : 2020-09-14 DOI: 10.1109/EFRE47760.2020.9242159
V. Skripnyak, M. Chirkov, E. Skripnyak, V. Skripnyak
The field of metamaterials has grown considerably in the last few decades due to the advances in new manufacturing technologies. Metamaterials currently are of interest for a wide variety of applications including damping systems. This work is aimed to evaluate dissipative effect of pentamode metamaterials subjected to dynamic loading. The results of numerical modelling of the mechanical behavior of pentamode metamaterials from alpha titanium alloys are received and compared with available experimental data. The model of inelastic deformation and ductile damage criterion are used to describe the ductility of the unit cell of metamaterials in a wide range of strain rates, temperature and stress triaxiality. A methodology for analyzing the energy dissipation due to inelastic deformation of metamaterials at high strain rates is presented. It is shown that the values of the energy dissipation coefficient during uniaxial dynamic compression of the pentamode metamaterial are 1.5 times higher than for the bulk alloy counterpart.
在过去的几十年里,由于新的制造技术的进步,超材料领域有了相当大的发展。目前,超材料在包括阻尼系统在内的广泛应用中引起了人们的兴趣。研究了五模超材料在动态载荷作用下的耗散效应。对α钛合金五模超材料的力学行为进行了数值模拟,并与已有的实验数据进行了比较。采用非弹性变形模型和延性损伤准则来描述超材料在应变速率、温度和应力三轴范围内的延性。提出了一种分析超材料在高应变率下非弹性变形所引起的能量耗散的方法。结果表明,在单轴动态压缩过程中,五模态超材料的能量耗散系数比块体合金高1.5倍。
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引用次数: 0
Analysis of Structure and Microhardness AlSi5Cu2 and AlSi10Cu2 Cast Alloys Subjected to Electron Beam Surface Melting 电子束表面熔化AlSi5Cu2和AlSi10Cu2铸造合金的组织和显微硬度分析
Pub Date : 2020-09-14 DOI: 10.1109/EFRE47760.2020.9242140
D. Zaguliaev, Ilya Chumachkov, Y. Ivanov, A. Abaturova, A. Ustinov, A. Semin
The research deals with the modification of AlSi5Cu2and AlSi10Cu2 alloy surfaces by the method of electron beam processing. It is established that the irradiation of the alloys by concentrated energy flow is accompanied by the increase in microhardness and covering the surface defects. Due to a great temperature difference between two media the surface melts at a superhigh rate and crystallizes again, because of it a grain size decreases resulting in the increase in microhardness. The arising tensile stresses contribute to the covering of the surface defects.
研究了用电子束法对alsi5cu2和AlSi10Cu2合金表面进行改性的方法。结果表明,在集中能量流辐照下,合金的显微硬度增加,表面缺陷被覆盖。由于两种介质之间的巨大温差,表面以超高的速度熔化并再次结晶,因此晶粒尺寸减小,导致显微硬度增加。产生的拉伸应力有助于表面缺陷的覆盖。
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引用次数: 1
Higher Harmonics in the Output Spectrum of Microwave Sources Based on Nonlaminar Electron Beams (Analysis of the Effect of Transverse and Longitudinal Bunches of the Space Charge) 基于非层流电子束的微波源输出谱中的高次谐波(空间电荷横向束和纵向束影响的分析)
Pub Date : 2020-09-14 DOI: 10.1109/EFRE47760.2020.9242085
Y. Kalinin, A. Starodubov
Nowadays one of the actual problems of modern vacuum electronic devices is moving the operating frequencies towards the millimeter-wave and THz regime. Operation at the n-th harmonic could be one of the possible and well-known approaches to increase the operating frequency of vacuum electronic devices. Devices based on the nonlaminar electron beams (vircator-type devices) employ an intrinsic complicated dynamics of the electron beam and may serve as compact microwave sources owing to the simplicity of design and simple tunability of working regimes. In this work, we study the dependence of higher harmonics excitations on the transverse and longitudinal distribution of current density in nonlaminar electron beams. We have considered two types of spatial form of space charge bunches: solid and hollow (quasi-hollow). Fourier-analysis of these spatial forms of electrons bunches has shown that the hollow (quasi-hollow) form is most suitable for higher harmonics excitation. We have also revealed several factors that exert influence on the spatial form of electrons bunches: a considerable amount of electron velocity scatter, a convergence of electron beam, the presence of reflected electrons in the electron beam, a magnitude of the periodic magnetic field. Experimental studies were carried out with the help of a demountable vacuum setup. Experimental studies have shown that there was an excitation of 15-th harmonic (the main frequency was near the 1 GHz) in the case of hollow (quasi-hollow) electron bunches. We have formulated several recommendations for the excitation of higher harmonics in vacuum electronic devices based on the nonrelativistic nonlaminar electron beams.
目前,现代真空电子器件的实际问题之一是工作频率向毫米波和太赫兹频段移动。在n次谐波下工作可能是提高真空电子器件工作频率的一种可能和众所周知的方法。基于非层流电子束的器件(virator -type Devices)利用了电子束固有的复杂动力学特性,由于设计简单、工作机制易于调节,可以作为紧凑的微波源。本文研究了高次激励对非层流电子束中电流密度横向和纵向分布的依赖关系。我们考虑了两种类型的空间电荷束的空间形式:固体和空心(准空心)。这些空间形式的电子束的傅里叶分析表明,空心(准空心)形式最适合于高次激发。我们还揭示了影响电子束空间形态的几个因素:相当数量的电子速度散射、电子束的会聚、电子束中反射电子的存在、周期性磁场的大小。实验研究是在可拆卸真空装置的帮助下进行的。实验研究表明,在空心(准空心)电子束中存在15次谐波激发(主频率在1ghz附近)。在非相对论性非层流电子束的基础上,提出了几种激发真空电子器件中高次谐波的建议。
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引用次数: 0
Copyright 版权
Pub Date : 2020-09-14 DOI: 10.1109/efre47760.2020.9241949
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引用次数: 0
Development of a Mirror Energy Analyzer of Charged Particles Beams Based on a Modified Electrostatic Field 基于修正静电场的带电粒子束镜像能量分析仪的研制
Pub Date : 2020-09-14 DOI: 10.1109/EFRE47760.2020.9242029
Zh.T. Kambarova, A. Saulebekov
The plane-symmetrical electrostatic energy analyzer of charged particle beams based on a modified field is proposed. The optimal electron-optical scheme of the energy analyzer is determined. A “ring-ring” type second-order angular focusing scheme is found. The focusing properties of the proposed energy analyzer are calculated. The instrumental function of the modified electron mirror in the case of a point source was obtained. The optimal values of the entrance parameters of the charged particle beams are obtained. The relative energy resolution in energy and luminosity of device are estimated.
提出了一种基于修正场的平面对称带电粒子束静电能量分析仪。确定了能量分析仪的最佳电光方案。建立了一种“环-环”型二阶角聚焦方案。计算了该能量分析仪的聚焦特性。得到了改进后的电子镜在点源情况下的仪器功能。得到了带电粒子束入口参数的最优值。估计了器件的能量和光度的相对能量分辨率。
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引用次数: 3
期刊
2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)
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