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

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Design, analysis and development of antimicrobial ventilator splitters for four patients 4例患者抗菌呼吸机分离器的设计、分析与研制
D. Singh, T. Mahender, Shaik Shashavali
3D Printers produce physical 3D objects by printing layer by layer from digital data. The digital data in the form of CAD models can be obtained either from any advance CAD packages or scanned models from a 3D Scanner. Due to the extreme shortage of ventilators available in India and continues increase of corona virus patients’ day by day there is a need of more ventilators. Five percent of patients who are suffering from corona virus need ventilator support for breathing. To overcome the shortage of ventilators, ventilator splitters were developed and it can be shared by many patients for oxygen supply.It can able to control flow of oxygen from the ventilator splitters to different patient’s lung sizes. So in this research a ventilator splitter, design in CATIA software, Computational Fluid Dynamic (CFD) analysis was done using ANSYS16.0 and fabricated by process of Fused Deposition Modeling (FDM) using antimicrobial PLA material. Antimicrobial PLA is biodegradable plastic integrated with copper nano-particles, which will restrict the 3D printed parts contaminating bacteria’s. So, copper nano-particles PLA can be used for producing ventilator splitters for splitting oxygen to the four patients at a time emergency situation in hospitals. From the CFD analysis it is observed that the oxygen maximum static pressure (1.058e +002Pa) is at inlet of the ventilator and minimum static pressure (-2.17e+002Pa) at outlet of the ventilator splitters. The maximum oxygen flow velocity is 2.121e+001m/s and there is no change of temperature of the flow. It is also seen that net mass flow rate and net heat transfer rate are 0.0032676226kg/s and -0.051416769w respectively.
3D打印机从数字数据中逐层打印出3D实物。以CAD模型形式的数字数据可以从任何先进的CAD软件包或从3D扫描仪扫描的模型中获得。由于印度可用的呼吸机极度短缺,加上冠状病毒患者每天都在增加,因此需要更多的呼吸机。5%的冠状病毒患者需要呼吸机辅助呼吸。为了克服呼吸机短缺的问题,研制出了呼吸机分配器,可以供多名患者共用。它可以控制氧气从呼吸机分离器流向不同病人的肺大小。为此,本研究采用CATIA软件设计了通风机分离器,采用ANSYS16.0软件进行了计算流体动力学(CFD)分析,并采用抗菌PLA材料采用熔融沉积建模(FDM)工艺进行了制造。抗菌PLA是一种生物可降解的塑料,与铜纳米颗粒结合在一起,这将限制3D打印部件污染细菌。因此,纳米铜颗粒聚乳酸可用于制造呼吸机分离器,在医院紧急情况下为四名患者一次分氧。通过CFD分析可知,氧气的最大静压(1.058e +002Pa)出现在通风机入口,最小静压(-2.17e+002Pa)出现在通风机分离器出口。最大氧气流速为2.121e+001m/s,气流温度无变化。净质量流量为0.0032676226kg/s,净换热率为-0.051416769w。
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引用次数: 2
A study of prevention and detection analysis of SQL injection attack SQL注入攻击的防范与检测分析研究
G. S. Rani, S. Sarika, P. Rupa
In the contemporary world, Web applications have turned out as a crucial element. Everything became easy, simpler, and can meet its aim speedy with web applications. These applications help to reach consumers, patrons, and stakeholders throughout the world easily. The web applications made it easier to keep a proper communication channel between business consortium and consumers. The web applications store the decisive information in its databases which it receives from users. The web application and database are accessible through the internet which gets affected by all the kinds of security threads, leads to misuse of the important information of the user by attackers. Among those attacks, the SQL Injection attack been placed under the top ten susceptibilities. By this type of attack, the hacker can steal important and confidential information from the database which will affect any business or consumer’s establishments. The paper here provides quintessential information on the functions of Machine learning, Predictive Analytics, and development of the consequential web that precisely calculates and avoids SQLIA with experiential valuation presented in the Receiver operating curve and Confusion matrix.
在当今世界,Web应用程序已成为一个至关重要的元素。一切都变得容易、简单,并且可以通过web应用程序快速实现其目标。这些应用程序有助于轻松地接触到世界各地的消费者、赞助人和利益相关者。web应用程序使得在商业联盟和消费者之间保持适当的沟通渠道变得更加容易。web应用程序将从用户那里接收到的决定性信息存储在数据库中。web应用程序和数据库是通过internet访问的,受到各种安全线程的影响,导致用户的重要信息被攻击者滥用。在这些攻击中,SQL注入攻击被列为十大易感性攻击之一。通过这种类型的攻击,黑客可以从数据库中窃取重要和机密的信息,这将影响任何企业或消费者的机构。本文提供了机器学习、预测分析和相应网络的功能的典型信息,该网络精确地计算和避免了SQLIA,并在接收者操作曲线和混淆矩阵中给出了经验评估。
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引用次数: 2
Numerical modeling of electron confinement in a multicusp magnetic trap 多轴磁阱中电子约束的数值模拟
V. Klenov
A charge-exchange target for neutralizing a negative ion beam with energies up to 10 MeV and higher requires the development of a highly efficient plasma trap which allows plasma to form and be confined with a linear density up to 1017 cm−2 and higher. The magnetic systems in which the condition of magnetohydrodynamic stability of the plasma is satisfied are of most interest when pursuing a high-density plasma. The electron confinement efficiency in a magnetic trap with a quasi-spherically symmetric multicusp magnetic field geometry with a "minimum B" at the center of the system, in which all cusps are point-type cusps is studied using numerical methods. The results of numerical experiments are compared with a collisionless model of particle motion in a trap.
中和能量高达10 MeV或更高的负离子束的电荷交换目标需要开发一种高效的等离子体陷阱,该陷阱允许等离子体形成并被限制在高达1017 cm - 2或更高的线性密度。在追求高密度等离子体时,满足等离子体磁流体动力学稳定性条件的磁系统是最感兴趣的。用数值方法研究了具有准球对称多尖点磁场几何形状的磁阱中所有尖点都为点型尖点的电子约束效率。数值实验结果与阱中粒子运动的无碰撞模型进行了比较。
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引用次数: 0
VHDL implementation of FPGA synthesizable ARM7 processor for mobile and embedded applications VHDL实现的FPGA可合成ARM7处理器,用于移动和嵌入式应用
G. Lakshminarayana, L. Suneel, M. Shabazkhan, Munipraveena Rela
Now a day’s very high speed processors play an important role in different applications like smart phones, embedded soc, robotics and IOT. In this paper all the instructions of ARM7 processor will be implemented using VHDL code and ARM7 data path will be implemented with multiplexer based design and it contains multiplier, Barrel shifter, ALU, current program status register, address buffer and data buffer. This design provides single cycle execution of instructions, low code density and also consumes less power, hence it is used in high speed, low power consumption applications like PDA, smart cards, internet of things, multimedia and wearable machines. All the instructions will be simulated using Modelsim and Xilinx XST tool will be used for FPGA synthesis.
现在,每天的高速处理器在智能手机,嵌入式soc,机器人和物联网等不同应用中发挥着重要作用。本文将采用VHDL代码实现ARM7处理器的所有指令,并采用基于多路复用器的设计实现ARM7数据路径,它包括乘法器、桶移位器、ALU、当前程序状态寄存器、地址缓冲区和数据缓冲区。本设计指令单周期执行,代码密度低,功耗低,适用于PDA、智能卡、物联网、多媒体、可穿戴设备等高速、低功耗应用。所有指令将使用Modelsim进行模拟,Xilinx XST工具将用于FPGA合成。
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引用次数: 0
Axial crushing behaviour of Kevlar polymer composite tubular structures under quasi-static compression 准静态压缩下Kevlar聚合物复合材料管状结构的轴向破碎行为
A. P. Kumar, M. Shunmugasundaram, D. Mishra, Maneiah, M. G. Rao
The present research article is aimed to study the impact of tube section on the buckling characteristics of Kevlar fabric reinforced epoxy polymer composite tubular structures exposed to quasi-static axial compressive load. A simple hand layup technique has been used in fabrication of the different composite tube specimens. Fabricated tube samples experimented under quasi-static compressive load consists of three different sections such as circular, square and pentagon. The effects of various geometry on the energy absorbing abilities and crushing characteristics were examined through quasi-static crushing load and the results are related with the conventional aluminium tube to validate the proficiency of Kevlar composite tubular structures for energy absorption application. The proposed Kevlar composite tube with different sections perceived the best geometry to improve the energy absorber performance in automotive collision applications.
本文旨在研究在准静态轴向压缩载荷作用下,管材截面对凯夫拉纤维增强环氧聚合物复合材料管状结构屈曲特性的影响。一种简单的手工铺层技术被用于制作不同的复合管样品。拟静态压缩载荷下的预制管试样由圆形、方形和五边形三种不同截面组成。通过准静态破碎载荷测试不同几何形状对吸能性能和破碎特性的影响,并与常规铝管进行对比,验证了凯夫拉复合材料管状结构吸能性能的可行性。所提出的不同截面的凯夫拉复合材料管具有最佳的几何形状,以提高汽车碰撞应用中的能量吸收性能。
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引用次数: 0
A novel implementation for brain MRI noise reduction 一种新的脑MRI降噪方法
G. Devi, S. Velliangiri, S. Alagumuthukrishnan
In this paper proposed algorithm is based on Dual Tree-CWT and Nonlocal Mean filtering processes is used to eliminate Rician noise from the brain magnetic resonance images. The noise reduction is done using two stage processes, first sparse DT-CWT is applied, which allows for distinction of data directionality in the transform space and then Rotational invariant version of Non-Local Mean filter is applied. The proposed algorithm is tested with different Rician noise levels of brain MR Images. Even the Image is degraded by 15% Rician noise the PSNR and SSIM obtained are 23dB and 0.93 which is a better performance as compared to Anisotropic Diffusion Filter (ADF), Non local Maximum Likelihood (NLML), Nutrosophic Set Median Filter (NS median).
本文提出了一种基于对偶树cwt和非局部均值滤波的脑磁共振图像去噪算法。降噪采用两阶段过程,首先应用稀疏DT-CWT,该方法允许在变换空间中区分数据的方向性,然后应用非局部均值滤波器的旋转不变版本。用不同噪声水平的脑磁共振图像对该算法进行了测试。在噪声降低15%的情况下,得到的PSNR和SSIM分别为23dB和0.93,优于各向异性扩散滤波(ADF)、非局部极大似然滤波(NLML)和营养集中值滤波(NS Median)。
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引用次数: 0
Impact of operational parameters on single beamlet deflection in a negative ion source for NBI applications NBI负离子源中操作参数对单束偏转的影响
A. Hurlbatt, F. Bonomo, G. Orozco, R. Nocentini, C. Wimmer, U. Fantz
For current and future large scale tokamaks, neutral beams for heating and current drive are generated from the neutralisation of large negative ion beams with energies up to 1 MeV and current of up to 40 A. To improve efficiency and prevent high heat loads on beamline components, permanent magnets are used to deflect co-extracted electrons out of the beam at a low energy. This field also affects the negative ions as they are accelerated, causing beamlets to exit the grid system with a residual offset and deflection angle. This adversely affects the overall divergence of the beam, and compensation is foreseen in future devices. Measurements of the residual deflection of a single beamlet have been carried out at the BATMAN Upgrade test facility by calculating relative beamlet angles from beam emission spectroscopy (BES) spectra, and through the use of one-dimensional carbon fibre composite (1D-CFC) tile calorimetry to find beamlet positions. It is described how these measurements can be made, and that they are limited to relative measurements only, for a single beamlet and for a single line of sight. The amount of beamlet deflection is shown to change significantly, by up to 0.6°(10 mrad), depending on the operational parameters used. As is to be expected the beamlet deflection angle is observed to be affected by changes to the voltages of the acceleration system. However, the beamlet deflection angle is also observed to change with RF power and other source parameters, which, to a first approximation, should only affect beamlet divergence, and not the deflection. These changes to beamlet deflection through parameters other than the grid voltages used may have consequences for systems planning to use suppression systems for the zig-zag deflection. The effectiveness of the suppression system may be reduced due to changes in the source parameters, which could lead to beam losses and high heat loads on downstream components.
对于当前和未来的大型托卡马克,用于加热和电流驱动的中性束是由能量高达1 MeV,电流高达40 A的大型负离子束中和产生的。为了提高效率并防止光束线组件的高热负荷,使用永磁体以低能量将共提取的电子从光束中偏转。当负离子被加速时,这个场也会影响它们,导致束流以剩余偏移和偏转角度退出网格系统。这对光束的整体发散有不利影响,在未来的设备中可以进行补偿。在BATMAN Upgrade测试设备上,通过计算光束发射光谱(BES)的相对光束角度,并通过使用一维碳纤维复合材料(1D-CFC)瓦量热法来确定光束位置,对单个光束的残余偏转进行了测量。它描述了这些测量是如何进行的,并且它们仅限于相对测量,对于单个光束和单个视线。根据所使用的操作参数,光束偏转的量变化显著,可达0.6°(10 mrad)。正如预期的那样,观察到束流偏转角度受到加速度系统电压变化的影响。然而,波束偏转角也随着射频功率和其他源参数的变化而变化,初步估计,这些参数只会影响波束发散,而不会影响波束偏转。这些通过除所使用的电网电压以外的参数对光束偏转的改变可能会对计划使用抑制系统来抑制之字形偏转的系统产生影响。由于源参数的变化,抑制系统的有效性可能会降低,这可能导致光束损失和下游组件的高热负荷。
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引用次数: 0
Preface: Seventh International Symposium on Negative Ions, Beams and Sources 第七届负离子、离子束和负离子源国际研讨会
BelchenkoYuri, FairclothDan, LawrieScott, TarvainenOlli, WadaMotoi
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引用次数: 0
Development of the directional Langmuir probe for the charged particle flow measurement 用于带电粒子流测量的定向朗缪尔探针的研制
S. Masaki, H. Nakano, M. Kisaki, E. Rattanawongnara, K. Nagaoka, K. Ikeda, Y. Fujiwara, M. Osakabe, K. Tsumori
The extraction mechanism of negative ion beams is affected by the behavior of positive and negative ions near the extraction apertures. Flow of the charged particles in a hydrogen discharge were measured with a newly developed directional photodetachment probe which has a single probe tip. Compared with our previous multiple-tip directional probe, the single-tip directional probe was able to measure fine flow structure of the positive and the negative ions without spatial ambiguity associated with electron deflection magnetic field and density gradient. The single-tip probe observed the turning of the flow of the negative hydrogen ion by increasing the bias voltage in the extraction region of the negative ion source.
负离子束的萃取机制受萃取孔附近正离子和负离子行为的影响。用一种新型的单探针头定向光分离探针测量了氢气放电中带电粒子的流动。与我们之前的多探针探针相比,单探针探针能够测量正负离子的精细流动结构,没有与电子偏转磁场和密度梯度相关的空间模糊性。单探针通过提高负离子源萃取区偏置电压,观察到负氢离子流动的转向。
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引用次数: 1
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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