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SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)最新文献

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Design of an efficient crank shaft for four wheeler passenger vehicle by using FEA 用有限元法设计四轮乘用车高效曲轴
N. Prabhakar, S. S. Kumar, K. Rao
Crankshaft plays a vital role to transform reciprocating motion into rotary motion. The design and analysis of the crankshaft is very important to improve the performance of I.C. Engine. In general the crankshaft is subjected to different pressure loads with respect to crank angle, therefore design and analysis of the crankshaft is important to increase the life of the four stroke engine. The main objective of this paper is to increase the life of the crankshaft of four stroke diesel engine by changing the main bearing diameter and crank web height in the existing design. The design was done by using CATIA software and analysis was done by using ANSYS. Two types of analysis, i.e. modal analysis and fatigue analysis have been carried out.
曲轴是将往复运动转化为旋转运动的关键。曲轴的设计与分析对提高内燃机的性能具有重要意义。一般情况下,曲轴承受不同曲轴角的压力载荷,因此对曲轴的设计和分析对提高四冲程发动机的寿命具有重要意义。本文的主要目的是通过改变现有设计中的主轴承直径和曲柄腹板高度来提高四冲程柴油机曲轴的寿命。采用CATIA软件进行设计,ANSYS软件进行分析。进行了两种分析,即模态分析和疲劳分析。
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引用次数: 0
Analysis of composite adsorber with graphite nanofiber based nanofluid as coolant 以石墨纳米纤维基纳米流体为冷却剂的复合吸附剂分析
Vaibhav N. Deshmukh, S. Radhakrishnan, R. Kulkarni
The use of composite adsorbent with nano particle additives having high surface area can lead to enhanced heat transfer, higher adsorption capacity and faster rate leading to better adsorber performance. The objectives of the present study were to investigate the effectiveness of nanofluid as a cooling fluid of a composite adsorber by carrying out nanofluid characterization and to investigate adsorption-desorption characteristics of a composite adsorbent for ammonia as an adsorbate.An experimental set up with tube-in-tube type configuration was constructed to monitor the thermal characteristics (heat transfer from and to the adsorber) and ammonia adsorption/desorption rates. The composite of calcium chloride with activated carbon and expanded graphite nanoparticles was made having different concentrations of CaCl2 ranging from 40 % to 80 % in the composite and expanded natural graphite (ENG) content ranging from 0-3 % by weight. The desorption characteristics were studied at different temperatures from 70° C to 110° C. The cooling fluid with and without graphite nanofibers (GNF) was circulated in the inner tube at different flow rates from 5 LPH to 25 LPH.From the experimentation on adsorption-desorption characteristics, it was found that the total amount of ammonia adsorbed increased from 133 g for 50:50 composition of CaCl2:AC to 156 g for CaCl2:AC composition of 50:50 with the addition of 3 % ENG nanoparticles. Also the adsorption process time reduced from 22 minutes to 18 minutes. For 50 % CaCl2 in the composite the temperature at which the maximum desorption occurred was 70°C.So, desorption could occur at lower temperature, which is advantageous as it increases the number of options for heat sources to be used. When nanofluid was used as a cooling fluid of the composite adsorber, the total amount of ammonia adsorbed increased from 79.411 g for basefluid to 90.206 g for 0.4 % graphite nanofiber nanofluid for flow rate of 25 LPH. With the use of composite adsorbent of CaCl2:AC of 50:50 composition and addition of expanded natural graphite (ENG) by 3% and when 0.4 % graphite nanofiber nanofluid was used as a cooling fluid, the maximum ammonia was adsorbed up to the bed length of 600 mm only out of the total bed length of 1 m indicating the possibility of reduction in the size of an adsorber.
复合吸附剂与具有高表面积的纳米颗粒添加剂的使用可以增强传热,提高吸附容量和更快的吸附速率,从而获得更好的吸附性能。本研究的目的是通过纳米流体表征来研究纳米流体作为复合吸附剂冷却流体的有效性,并研究复合吸附剂作为吸附物对氨的吸附-解吸特性。建立了一个管中管型的实验装置,以监测热特性(从吸附器到吸附器的传热)和氨吸附/解吸速率。制备了氯化钙、活性炭和纳米膨胀石墨的复合材料,复合材料中CaCl2的浓度为40% ~ 80%,膨胀天然石墨(ENG)的含量为0 ~ 3%(重量计)。在70℃~ 110℃的不同温度下,研究了石墨纳米纤维(GNF)和不含石墨纳米纤维(GNF)的冷却液在管内以5 ~ 25 LPH的不同流速循环。通过吸附-解吸特性实验发现,添加3% ENG纳米颗粒后,CaCl2:AC比例为50:50时,氨的吸附总量由133 g增加到156 g。吸附过程时间由22分钟缩短至18分钟。当CaCl2含量为50%时,复合材料的最大解吸温度为70℃。因此,解吸可以在较低的温度下进行,这是有利的,因为它增加了可供选择的热源的数量。当纳米流体作为复合吸附器的冷却流体时,当流量为25 LPH时,基液的氨吸附总量从79.411 g增加到0.4%石墨纳米纤维纳米流体的90.206 g。采用50:50的CaCl2:AC复合吸附剂,添加3%的膨胀天然石墨(ENG),并以0.4%的石墨纳米纤维纳米流体作为冷却液,在1 m的总床长中,最大氨被吸附到600 mm,这表明吸附器尺寸有缩小的可能性。
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引用次数: 1
Design and analysis of head expander of electrodynamic shaker for vibration testing 振动试验用电动振动筛头部膨胀器的设计与分析
Vinod Kumar Bandu, Venkata Narayana Yenugula, B. Shirish
Design of Head Expander (HE) for environmental vibration testing components with a required test frequency range has become very important, because it is an interface between electrodynamics vibration shaker and test specimen. The HE subjected to resonant and anti-resonant frequencies due to limitations of mass/stiffness properties. The random vibration and harmonic analysis of existing Head Expander was carried out and validated with tested results in the present work. The proposed new features Head Expander is designed by introducing three different hole-patterns which accommodates the different configurations of work pieces for vibration testing. Modal analysis, random vibration and harmonic analysis were carried out using generalized finite element software, ANSYS. The GRMS values of proposed HE design are compared with GRMS values of NAVMAT P-9492 work and found satisfactory.
环境振动试验部件的头部膨胀器(HE)是电动力激振器与试验试样之间的接口,其设计具有要求的测试频率范围变得非常重要。由于质量/刚度特性的限制,HE受到谐振和反谐振频率的影响。本文对现有膨胀机进行了随机振动和谐波分析,并与试验结果进行了验证。提出的新功能头部膨胀机的设计引入了三种不同的孔模式,以适应不同配置的工件进行振动测试。采用通用有限元软件ANSYS进行了模态分析、随机振动分析和谐波分析。将提出的HE设计的GRMS值与NAVMAT P-9492工作的GRMS值进行了比较,结果令人满意。
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引用次数: 0
The data intactness of efficient audit service outsourcing for data integrity in clouds 将数据完整性高效的审计服务外包给云中的数据完整性
U. Veeresh, G. Kumar, S. Asif
The cloud is the web-based computer which allows services to be exchanged. It enables users to use the application on any device with internet or intranet access without having an application installed and allows users to access their personal files and applications. Many people have recently used databases to store their data in the cloud. This is useful because it helps users to save data and allows users to access it anywhere and anywhere. The cloud has changed the way applications and databases are saved. Nowadays, running computing servers are stored in cloud computing. The main consideration of cloud information storage is the protection of cloud-specified information. The modern phenomenon used to store and handle data without investments in resources created many security problems that do not seem fully understood. This article focuses on cloud server information security and integrity. A third-party investigator is completed with the verification of data integrity who can sporadically check data integrity on behalf of his consumers.
云是一种基于网络的计算机,它允许服务交换。它使用户可以在任何具有internet或intranet访问的设备上使用该应用程序,而无需安装应用程序,并允许用户访问他们的个人文件和应用程序。最近,许多人使用数据库将数据存储在云中。这很有用,因为它可以帮助用户保存数据,并允许用户随时随地访问数据。云改变了应用程序和数据库的保存方式。如今,运行的计算服务器都存储在云计算中。云信息存储的主要考虑因素是对云指定信息的保护。用于存储和处理数据而不投资资源的现代现象造成了许多似乎尚未完全理解的安全问题。本文主要关注云服务器信息的安全性和完整性。第三方调查员完成了数据完整性的验证,他可以代表他的消费者偶尔检查数据完整性。
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引用次数: 0
COVID-19 image classification techniques in medical analysis using deep representations 医学分析中基于深度表征的COVID-19图像分类技术
Morarjee Kolla, H. R. Rao, N. Kumar
Covid-19 is a fast-growing disease that affects human health with contacts nowadays. The medical community has not found any vaccine for immediate use, and some countries recently released vaccines. The human health and financial status of various countries spoiled recently with this virus. COVID-19 vaccine research is at the clinical trial stage in many countries. Mainly this disease affects the lungs of the patients. Recently deep learning approaches are widely using in radiographic image classifications with large-scale data. Convolutional Neural Networks (CNN) are widely used to diagnose COVID-19 pneumonia classification on Chest radiographic images to help radiologists in medical analysis. Recently some researchers developed tools to detect the virus, and they reduce the time of chest X-ray interpretation. This article discusses methods that can help protect themselves from those already infected with the virus by classifying the large-scale radiographic images with deep learning models. This study compares various methodologies and observes exciting insights for future research directions. © 2021 Author(s).
Covid-19是当今一种快速发展的疾病,通过接触影响人类健康。医学界还没有找到任何可以立即使用的疫苗,一些国家最近发布了疫苗。最近,这种病毒破坏了各国的人类健康和财政状况。COVID-19疫苗研究在许多国家处于临床试验阶段。这种疾病主要影响患者的肺部。近年来,深度学习方法被广泛应用于具有大规模数据的放射图像分类中。卷积神经网络(CNN)被广泛用于胸片图像上的COVID-19肺炎分类诊断,以帮助放射科医生进行医学分析。最近,一些研究人员开发了检测这种病毒的工具,减少了胸部x光检查的时间。本文讨论了通过深度学习模型对大规模放射图像进行分类,可以帮助保护自己免受已经感染病毒的人的方法。本研究比较了各种研究方法,并对未来的研究方向提出了令人振奋的见解。©2021作者。
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引用次数: 0
Finite element analysis of composite beams 组合梁有限元分析
T. Kumar, G. Harsha
In Finite Element analysis the size of mesh plays a critical role. It is closely said that accuracy and number of mesh required for the meshing of the element. This paper presents the effect of the von misses and various constraints on the accuracy of the result. On the basis of the papers referred and guidelines obtained for choosing the appropriate mesh size in finite element analysis has been provided and explained about the von misses stress occurred in the model. The web reinforcement should be strengthened enough to carry tension forces as well as compression forces so that the compression wrinkling is avoided. Von mises proves to be the perfect safe value for the designing of composite structures which involves various stress theories and failure criteria.
在有限元分析中,网格的大小起着至关重要的作用。严格地说,单元的网格划分要求精度和网格数。本文讨论了von miss和各种约束对结果精度的影响。在参考文献的基础上,给出了有限元分析中选择合适网格尺寸的准则,并对模型中出现的von miss应力进行了解释。腹板加固应加强到足以承受拉力和压缩力,以避免压缩起皱。在涉及各种应力理论和破坏准则的复合材料结构设计中,Von mises被证明是一个完美的安全值。
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引用次数: 0
Plasma electrode shape suitable for plasma electrode performance study 等离子体电极形状适合于等离子体电极性能的研究
K. Bito, M. Sasao, M. Kisaki, M. Wada
A compact ECR ion source was used to investigate the effect that the shape of the plasma electrode (PE) has on the surface production of negative hydrogen (H−) ions. A C12A7 electride PE produced ten times more H-ion current compared with a molybdenum (Mo) PE of the identical design. Four times more H- ion current was obtained when the ion source plasma faces the 45-degree tapered hole opened on the surface of the electride PE as compared to the current obtained from a plasma facing the flat side of the PE. This enhancement in H- ion current may indicate larger surface production of H− ions by the enlarged surface area. A Mo PE also showed a similar effect but with less pronounced H- ion current enhancement. A beam trajectory study showed that the beam divergence was larger when the source plasma faced against the tapered side of the PE.
采用紧凑型ECR离子源研究了等离子体电极(PE)形状对负氢离子(H−)表面生成的影响。与相同设计的钼(Mo) PE相比,C12A7电极PE产生的氢离子电流多十倍。当离子源等离子体面向电极PE表面的45度锥形孔时,获得的氢离子电流是面向PE平侧等离子体获得的电流的四倍。这种氢离子电流的增强可能表明,由于表面积的扩大,氢离子的表面产量增加了。A Mo PE也表现出类似的效果,但氢离子电流增强不明显。束流轨迹研究表明,当源等离子体朝向PE的锥形侧时,束流发散更大。
{"title":"Plasma electrode shape suitable for plasma electrode performance study","authors":"K. Bito, M. Sasao, M. Kisaki, M. Wada","doi":"10.1063/5.0057489","DOIUrl":"https://doi.org/10.1063/5.0057489","url":null,"abstract":"A compact ECR ion source was used to investigate the effect that the shape of the plasma electrode (PE) has on the surface production of negative hydrogen (H−) ions. A C12A7 electride PE produced ten times more H-ion current compared with a molybdenum (Mo) PE of the identical design. Four times more H- ion current was obtained when the ion source plasma faces the 45-degree tapered hole opened on the surface of the electride PE as compared to the current obtained from a plasma facing the flat side of the PE. This enhancement in H- ion current may indicate larger surface production of H− ions by the enlarged surface area. A Mo PE also showed a similar effect but with less pronounced H- ion current enhancement. A beam trajectory study showed that the beam divergence was larger when the source plasma faced against the tapered side of the PE.","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90620430","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
Recent achievements in studies of negative beam formation and acceleration in the tandem accelerator at Budker Institute 巴德克研究所串列加速器负束形成与加速研究的最新成果
A. Ivanov, A. Sanin, Y. Belchenko, I. Gusev, I. Emelev, V. Rashchenko, V. Savkin, I. Shchudlo, I. Sorokin, S. Taskaev, P. Zubarev, A. Gmyrya
The source for epithermal neutron production, based on vacuum insulated tandem accelerator (VITA) is under operation at the Budker Institute of Nuclear Physics since 2006. The accelerator provides a high current DС proton beam with energy up to 2 MeV. Numerous improvements to achieve stable tandem work and increase the accelerated proton current were made in more than a decade of experimental operation. These improvements include reduction of the accelerator dark current, modifications for the secondary particles suppression in the tandem gaps, vacuum improvement, upgrades of negative ion source, introduction of additional diagnostics to control and adjust the beam injection and transport. These measures provide the upgraded tandem operation with the accelerated proton current of up 9 mA. Two new schemes of negative ion injection into the tandem were designed and tested. New schemes use the upgraded version of a Penning surface-plasma negative ion source with DС H− beam current of up 15 mA and beam pre-acceleration before injection to tandem. The recent experimental results and its comparison with numerical modelling are presented and discussed.
基于真空绝缘串列加速器(VITA)的超热中子生产源自2006年以来一直在Budker核物理研究所运行。加速器提供高电流DС质子束,能量高达2兆电子伏。在十多年的实验操作中,为了实现稳定的串联工作和增加加速质子电流,进行了许多改进。这些改进包括减少加速器暗电流,改进串联间隙中的二次粒子抑制,改进真空,升级负离子源,引入额外的诊断来控制和调整光束注入和传输。这些措施提供了升级的串联操作,加速质子电流高达9毫安。设计并测试了两种新的负离子注入方案。新方案使用升级版的Penning表面等离子体负离子源,其DС H -束电流高达15 mA,并在注入串联之前进行束预加速。介绍并讨论了最近的实验结果及其与数值模拟的比较。
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引用次数: 0
A 10 mA, steady-state, charge exchange negative ion beam source 一个10毫安,稳态,电荷交换负离子束源
I. Shikhovtsev, V. Amirov, K. Anikeeva, V. Davydenko, I. Emelev, A. Ivanov, V. Mishagin, V. Rashchenko, I. Maslakov, E. Shubin
A negative ion source, which utilizes a conversion of primary high current proton beam into negative ions in a gas target via charge-exchange collisions, is under development in Budker Institute, Novosibirsk. The proposed beam will be used for injection into a tandem accelerator, which is a part of the neutron source dedicated for boron-neutron capture therapy (BNCT). The ion source is designed to produce a beam that contains ≥50% of molecular ions. The initial ion beam current is about 1 A at 30 keV energy. After molecular ion dissociation in a gas target, which produces protons with an energy of 15 keV, and further charge-exchange collisions, the beam after the target will contain about 2% of negative ion species with a current in excess of 10 mA. The negative ion beam is then separated by the magnetic field, accelerated up to an energy of 105 keV and enters the tandem accelerator. This paper presents the results of simulations of the beam formation, acceleration and transport. The arrangement of the ion source and corresponding high voltage power supply are also discussed.
一种负离子源,利用一次高电流质子束通过电荷交换碰撞在气体靶中转化为负离子,正在新西伯利亚的Budker研究所开发中。提议的光束将用于注入串联加速器,该加速器是专用于硼中子捕获治疗(BNCT)的中子源的一部分。离子源设计用于产生含有≥50%分子离子的光束。在30 keV能量下,初始离子束电流约为1 A。气体靶中的分子离子解离产生能量为15 keV的质子,再经过电荷交换碰撞,靶后的束流将含有约2%的负离子,电流超过10 mA。然后,负离子束被磁场分离,加速到105千伏特的能量,进入串联加速器。本文给出了光束形成、加速和输运的模拟结果。讨论了离子源的布置和相应的高压电源。
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引用次数: 0
Study on properties of foam concrete when cement is partially replaced by alccofine and filler material by fly ash 泡沫混凝土部分用乙醇替代水泥,部分用粉煤灰替代填充材料的性能研究
Gonugodugu Praveen Kumar, G. V. V. Satyanarayana
Concrete is a denser material and its thickness goes from 22-24 kn/m3. In this current world Foam concrete has gain part of significance as it has been effectively utilized and because of its lower thickness than typical cement. Because of the fast advancement around Globe, there is a quick development in the construction exercises. To meet this quick development in the construction exercises we are tremendously utilizing wide measure of sand and concrete. Because of this quick use of sand and concrete in huge sums, we are making normal unevenness. To kick sand we off mining of sand from waterway beds. which makes numerous characteristic dangers and become danger for people. As a mindful resident of world everybody should think and quit use of filler material& concrete in gigantic amount for Constructional exercises. Fly debris are extraordinary compared to other elective arrangement as a fractional supplanting filler material & concrete by Alccofine. The ongoing examination I had replaced filler material by fly debris and concrete by Alccofine. The usage of added supplicants in Foam Concrete we can accomplish great workability, strength and furthermore decrease by and large expense. By halting utilization of high amount of filler material&concrete in froth solid i preserve green house impact and furthermore other crude supplicants utilized in Concrete. Froth concrete is delivered when we consistently convey the Air Bubbles all overt the Concrete. Thickness of Foam Concrete is basically subject to Density of Foam used in Slurry & Strength diminishes as decline in densities. This test examination was intended for thickness of 1700 kg/m3. This examination was gathered to assurance of Workability, Plastic thickness & Compressive Strength of Foam Concrete. Samples were made & tried at 7,14 years old and 28 days.
混凝土是一种密度较大的材料,其厚度为22-24 kn/m3。在当今世界,泡沫混凝土由于其有效利用和比典型水泥更低的厚度而具有一定的意义。由于全球经济的快速发展,建筑演习也有了快速的发展。为了满足这种快速发展的施工练习,我们极大地利用了大量的沙子和混凝土。由于大量的沙子和混凝土的快速使用,我们正在制造正常的不平整。为了防沙,我们停止从水道河床开采沙子。这就产生了许多特有的危险,成为人们的危险。作为一个有意识的世界居民,每个人都应该思考和停止使用大量的填充物和混凝土进行建筑练习。与其他选择性安排相比,飞屑是非凡的,作为一种分数替代填充材料和混凝土。在正在进行的检查中,我用飞屑代替了填充物,用乙醇代替了混凝土。在泡沫混凝土中加入助剂,可获得良好的和易性和强度,并可大幅度降低成本。通过停止在泡沫固体中使用大量的填充材料和混凝土,可以保护温室效应和混凝土中使用的其他粗助剂。当我们始终如一地在混凝土表面输送气泡时,就会输送泡沫混凝土。泡沫混凝土的厚度基本上取决于浆料中所用泡沫的密度,强度随着密度的下降而降低。本试验检测的厚度为1700 kg/m3。为保证泡沫混凝土的工作性、塑性厚度和抗压强度,进行了试验。分别在7岁、14岁和28日龄时制作样品并进行试验。
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引用次数: 1
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SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)
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