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From Electrojet to ITER: India's Journey in Experimental Plasma Physics 从电射流到ITER:印度实验等离子体物理学之旅
Pub Date : 2017-02-01 DOI: 10.13189/UJPA.2017.110104
P. I. John
India has an international presence in Plasma Physics and its diverse applications such as thermonuclear fusion, material processing, strategic and environmental applications and plasma devices. From a modest start in the early 1970s, we have made great strides in the field of experimental plasma physics. Capacity building in techniques relevant to plasma production, manipulation and parameter control, pulsed power, creation of magnetic fields of complex geometries, clean vacuum and pumping systems, development and deployment of diagnostics to enable understanding of fundamental processes in plasmas and computer simulation to model plasma phenomena have been truly remarkable. Parallel to this, a community of physicists, engineers and computer experts has grown and matured. Funding mechanisms and financial support essential to broad base the research and development activity by drawing in Universities and education institutes have been nucleated. It is through these activities that the human resource and technology development essential to sustain India's ambitious forays into magnetic confinement fusion and industrial and strategic plasma applications has taken place. This paper is an attempt to give a historical perspective to this journey, which started at the Physical Research Laboratory, Ahmedabad and later, involved the Institute for Plasma Research at Gandhinagar, many DAE Institutions, IITs and Universities.
印度在等离子体物理及其各种应用领域拥有国际影响力,如热核融合、材料加工、战略和环境应用以及等离子体设备。从20世纪70年代早期的一个不起眼的开端,我们已经在实验等离子体物理学领域取得了巨大的进步。在等离子体生产、操作和参数控制、脉冲功率、复杂几何磁场的创建、清洁真空和泵送系统、诊断技术的开发和部署以了解等离子体的基本过程和计算机模拟以模拟等离子体现象等相关技术方面的能力建设确实非常显著。与此同时,一个由物理学家、工程师和计算机专家组成的社区也在成长和成熟。通过吸引大学和教育机构来广泛开展研究和发展活动所必需的筹资机制和财政支助已经形成核心。正是通过这些活动,人力资源和技术发展对维持印度在磁约束聚变和工业和战略等离子体应用方面的雄心壮志至关重要。这篇论文试图从历史的角度来看待这段旅程,它始于艾哈迈达巴德的物理研究实验室,后来涉及甘地纳加尔的等离子体研究所,许多DAE机构,印度理工学院和大学。
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引用次数: 0
Light in the Service of Mankind 为人类服务的光
Pub Date : 2017-02-01 DOI: 10.13189/UJPA.2017.110101
J. Connerade
Understanding the nature of light has stimulated scientific research over many centuries and progress in the description of electromagnetic radiation has been key in the development of modern science. Some highlights in this story are celebrated in the context of the International Year of Light YL2015 declared by UNESCO, which were the backdrop for scientific meetings held in Caceres (Spain) and in Poland (Wroclaw) involving the European Academy of Sciences Arts and Letters. It is emphasised that this long history of research on Light is by no means over, and has resulted in many important advances, including such applications as the laser and the harnessing of solar energy for electric power generation, of great importance for the economic development of Southern regions such as North Africa. Cultural aspects of the importance of light (in the Arts, in literature and in philosophy) are also mentioned.
几个世纪以来,对光的本质的理解刺激了科学研究,而对电磁辐射描述的进步一直是现代科学发展的关键。这个故事的一些亮点是在联合国教科文组织宣布的2015年国际光年的背景下庆祝的,这是在卡塞雷斯(西班牙)和波兰(弗罗茨瓦夫)举行的科学会议的背景下,欧洲科学艺术与文学院参加了会议。它强调,光的研究的这一悠久的历史绝不是结束,并导致了许多重要的进步,包括激光和利用太阳能发电的应用,对南部地区,如北非的经济发展非常重要。光在文化方面的重要性(在艺术、文学和哲学中)也被提及。
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引用次数: 0
Renormalization the Energy of Elementary Excitations in Solids by the Strong (Nuclear) Interaction 用强(核)相互作用重整固体中基本激发的能量
Pub Date : 2017-01-01 DOI: 10.13189/UJPA.2017.110102
V. Plekhanov
The experimental evidence of renormalization the energy of the elementary excitations in solids which are differ by term of one neutron from each other by the strong (nuclear) interaction has been presented for the first time. This evidence is based on two independent results: 1) The increase exciton energy on 103 meV is caused by the adding of one neutron (using LiD crystals instead LiH ones); 2) After increasing the amounts by one neutron the energy of LO phonons has decreased by 36 meV. The last one is directly seen from luminescence and scattering spectra. As far as the gravitation, electromagnetic and weak interactions are the same in both of kind crystals, it only changes the strong interaction. Therefore a logical conclusion is made that the renormalization of the energy of electromagnetic excitations (excitons, phonons) is carried out by the strong (nuclear) interaction.
本文首次给出了固体中因强(核)相互作用而存在一个中子项差异的元素激发能量重整化的实验证据。这一证据是基于两个独立的结果:1)103 meV上激子能量的增加是由添加一个中子引起的(使用LiD晶体而不是LiH晶体);2)每增加一个中子,LO声子的能量降低了36 meV。最后一种是直接从发光和散射光谱中看到的。就两种晶体的引力、电磁和弱相互作用相同而言,它只改变了强相互作用。由此得出一个逻辑结论:电磁激发(激子、声子)能量的重整化是由强(核)相互作用进行的。
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引用次数: 1
Investigation of Optical Properties on BaSnO 3 Materials basno3材料光学性质的研究
Pub Date : 2017-01-01 DOI: 10.13189/UJPA.2017.110603
D. T. Anh, N. T. Thanh
Perovskite BaSnO 3 materials were synthesized under hydrothermal condition followed heat treatment at variable temperature 423 - 673 K. Phase structure and morphology and optical properties were characterized. Result showed band gap about 3.31 eV and highly optical transparency in the visible spectral region and average particles size 40 -45 nm. Thermal annealing process has affected on phase structure and luminescence in BaSnO 3 material.
采用水热法合成了钙钛矿型basno3材料,并在423 ~ 673 K的变温条件下进行热处理。表征了相结构、形貌和光学性质。结果表明,该材料的带隙约为3.31 eV,在可见光区具有较高的光学透明度,平均粒径为40 ~ 45 nm。热退火工艺对basno3材料的相结构和发光性能有影响。
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引用次数: 2
Challenges of Superdense Coding with Accelerated Fermions 用加速费米子进行高密度编码的挑战
Pub Date : 2017-01-01 DOI: 10.13189/UJPA.2017.110501
Mehrnoosh Farahmand, H. Mohammadzadeh
Two particles, even being far from each other have quantum correlation as a result of the existence of entanglement between them. Therefore, information can be shared by entangled particles, sitting in separate places. Superdense coding is one of the quantum protocols that rely on entanglement. In this paper, we review superdense coding with a non-inertial observer in the beyond single mode approximation and investigate the probability of success for superdense coding. We analyze the mutual information due to the effects of acceleration on the quantum and classical correlations of the state. Entanglement behavior is studied considering an entanglement measure the so-called the concurrence. Comparing the mutual information and the concurrence with the probability of superdense coding is shown that quantities have different behaviors, particularly, when the beyond single mode approximation plays a powerful role.
两个粒子即使相距遥远,由于它们之间存在纠缠而具有量子相关性。因此,信息可以由位于不同位置的纠缠粒子共享。超密编码是依赖于纠缠的量子协议之一。本文讨论了超单模近似下非惯性观测器的超密编码,并研究了超密编码成功的概率。我们分析了由于加速度对量子态和经典态相关的影响而产生的互信息。考虑到纠缠度量即并发度,对纠缠行为进行了研究。通过对互信息和并发性与超密编码概率的比较表明,数量具有不同的行为,特别是当超单模近似发挥强大作用时。
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引用次数: 0
Industrial Use of HiPIMS up to Now and a Glance into the Future, A Review by a Manufacturer Introduction of the hiP-V hiPlus Technology hiims的工业应用现状及未来展望,一家制造商的回顾介绍hiP-V hiPlus技术
Pub Date : 2017-01-01 DOI: 10.13189/UJPA.2017.110301
G. Eichenhofer, I. Fernandez, A. Wennberg
It has been demonstrated by several groups that HiPIMS is a state of the art tool for applying demanding coatings with superior film properties. The real industrial breakthrough for the HiPIMS-technology has not yet happened. On the other hand, the up till now available HiPIMS-PS were mainly been up-scaled “prototypes”, far away from industrial work horses. With the hiP-V HiPIMS power system, a direct derivative of a robust power supply technology already in commercial use for public transportation systems, another milestone is set to make the HiPIMS technology go mainstream. HiPIMS is not a revolution that will make all other technologies obsolete, yet it is a very powerful complement. With a reliable, multi-functional power supply and with a rapid arc-handling, it could possibly be a start of a new era in thin film production. Just consider the possibility of etching and implantation to increase cleanliness and adhesion of the samples. Until now, most of the R&D work done in HiPIMS, has been dedicated to hard coatings and tool coatings. Here, HiPIMS is surely useful but not the expected technological breakthrough. For the future, the implementation of the new pos. reverse pulse, the hiP-V hiPlus HiPIMS technology, is opening a whole new field of possible applications for i.e. nonconductive substrates where no bias can be applied. Glass and plastics can be processed with remarkable results in hardness, enhanced film properties and additionally, it is achieved at lower substrate temperatures. It has been a slow start for HiPIMS, but the future looks bright.
几个小组已经证明hiims是一种最先进的工具,用于应用具有优异薄膜性能的苛刻涂层。hipims技术的真正工业突破尚未发生。另一方面,迄今为止可用的HiPIMS-PS主要是放大的“原型”,距离工业工作马很远。hiP-V HiPIMS电力系统是一种已经用于公共交通系统的强大电源技术的直接衍生产品,它将使HiPIMS技术成为主流的又一个里程碑。HiPIMS不是一场革命,它将使所有其他技术过时,但它是一个非常强大的补充。有了可靠的多功能电源和快速的电弧处理,它可能是薄膜生产新时代的开始。只需考虑蚀刻和注入的可能性,以增加样品的清洁度和附着力。到目前为止,hihiims的大部分研发工作都致力于硬质涂层和刀具涂层。在这里,HiPIMS肯定是有用的,但不是预期的技术突破。对于未来,新的正反脉冲,hiP-V hiPlus hiims技术的实施,正在为无偏置的非导电基板开辟一个全新的应用领域。玻璃和塑料可以在硬度,增强薄膜性能方面取得显著的效果,另外,它可以在较低的基材温度下实现。对HiPIMS来说,这是一个缓慢的开始,但前景一片光明。
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引用次数: 10
Quality Control of Intensity Modulated Radiation Therapy (IMRT) 调强放射治疗(IMRT)质量控制
Pub Date : 2017-01-01 DOI: 10.13189/ujpa.2017.110201
M. Mahfuzur, A. Golam, Md. Anwarul
The aim of this study is to ensure the MLC positional and leaf speed accuracy. To check the MLC positional and leaf speed accuracy picket fence and synchronized segmented stripes test pattern were performed. The relative and absolute dosimetric verification were analyzed in this study. This project was followed by Quality control for Intensity-Modulated Radiation Therapy, as in the Recommendation No.15 from SGSMP. For relative dosimetric verification test such as different dose in same depth, same dose in different depth, chair test and inhomogeneous test were performed. All the plans were followed by Gamma index. To verify absolute dose 0.3 cc SemiFlex chamber along with a PTW solid water phantom was used. In picket fence and synchronized segmented stripes test, match-lines appear at -10.0, -5.0, 0.0, 5.0, 10.0 and -12.0, -8.0, -4.0, 0.0, 4.0, 8.0, 12.0 cm respectively from the center of the field. The Gamma Index for the different dose in same depth, same dose in different depth, chair test and inhomogeneous test were 99.48% & -0.52%, 99.35% & -0.65%, 99.04% & -1.96% and 98.34% & -1.66% at the pixel range of -1.00 to 1.00 & 1.00 to 2.00 respectively. Calculated and measured absolute dose for three cases were 2.050 &1.970 (% deviation 4.06), 1.728 & 1.730 (% deviation -0.011) and 1.270 & 1.250 (% deviation 1.6).
本研究的目的是确保MLC的位置和叶片速度精度。为验证MLC定位和叶片速度的准确性,采用桩栅和同步分段条纹试验模式。本研究分析了相对剂量学和绝对剂量学的验证。根据SGSMP第15号建议,该项目之后是调强放射治疗的质量控制。进行了同深度不同剂量、不同深度相同剂量、椅子试验和不均匀试验等相对剂量学验证试验。所有的计划都有伽马指数。为了验证绝对剂量,使用0.3 cc的SemiFlex腔室和PTW固体水模体。在桩栅栏和同步分段条纹测试中,匹配线分别出现在距场地中心-10.0、-5.0、0.0、5.0、10.0和-12.0、-8.0、-4.0、0.0、4.0、8.0、12.0 cm处。在-1.00 ~ 1.00和1.00 ~ 2.00像素范围内,相同深度不同剂量、相同深度不同剂量、chair试验和非均匀试验的伽马指数分别为99.48% & -0.52%、99.35% & -0.65%、99.04% & -1.96%和98.34% & -1.66%。计算和测量的3例绝对剂量分别为2.050和1.970(%偏差4.06)、1.728和1.730(%偏差-0.011)和1.270和1.250(%偏差1.6)。
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引用次数: 0
Study on Discharge Dynamics in an Atmospheric Pressure Dielectric Barrier Discharge 常压介质阻挡放电放电动力学研究
Pub Date : 2017-01-01 DOI: 10.13189/UJPA.2017.110302
W. Tay, S. S. Kausik, S. Yap, C. S. Wong
In this work, the discharge dynamics in an atmospheric pressure dielectric barrier discharge (DBD) is studied in a DBD reactor having parallel plate electrodes geometry. The DBD reactor is powered by a 50 Hz ac high voltage power source through a ballast resistor. The images of filaments occurring in the discharge gap are captured using a high speed intensified charge coupled device camera. The occurrence of frequent synchronous breakdown of micro discharges has been observed across the discharge gap when the electron avalanche happens in the direction from the dielectric surface towards the opposite electrode. The discharge gap dependence on synchronous breakdown is studied by changing the discharge gap. The shape of the filaments has been found to be strongly dependent on the direction of the electron avalanche. It is demonstrated that the diffusion of electrons occurs when the electron avalanche happens in the direction towards the dielectric from the opposite electrode. A smaller diffusion leading to narrower filaments is observed when the electron avalanche happens in the direction from the dielectric to the opposite electrode. This can be explained by the existence of memory charge on the dielectric surface.
本文在具有平行板电极结构的介质阻挡放电反应器中研究了大气压介质阻挡放电的放电动力学。DBD电抗器由50hz交流高压电源通过镇流器电阻供电。采用高速强化电荷耦合器件相机捕捉放电间隙内细丝的图像。当电子雪崩发生在从介电表面到相反电极的方向时,在放电间隙中经常发生微放电的同步击穿。通过改变放电间隙,研究了放电间隙对同步击穿的依赖关系。细丝的形状已被发现强烈地依赖于电子雪崩的方向。结果表明,当电子雪崩从对电极向介质方向发生时,会发生电子的扩散。当电子雪崩发生在从电介质到相反电极的方向时,观察到较小的扩散导致更窄的细丝。这可以用介质表面存在的记忆电荷来解释。
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引用次数: 0
Mass-spectrum of Charged Leptons from the Planck Mass 来自普朗克质量的带电轻子的质谱
Pub Date : 2016-12-01 DOI: 10.13189/ujpa.2016.100605
A. Kotkov
There are three generations of charged leptons - the electron, muon, and tau. Masses of elementary particles are considered as fundamental constants. Modern physics believes these masses could be calculated from more fundamental mass scale, e.g., the Planck mass. Scientists seek for such relationship for many years. However, a relation between mass-spectrum of charged leptons and the Planck mass is still unknown. Here we show a way to derive the mass-spectrum of charged leptons from the Planck mass.
有三代带电轻子——电子、介子和tau。基本粒子的质量被认为是基本常数。现代物理学认为,这些质量可以从更基本的质量尺度计算出来,例如普朗克质量。科学家们多年来一直在寻找这种关系。然而,带电轻子的质谱与普朗克质量之间的关系仍然是未知的。这里我们展示了一种从普朗克质量推导带电轻子质量谱的方法。
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引用次数: 0
Scale Independent Workable Model of Final Unification 最终统一的尺度独立可行模型
Pub Date : 2016-12-01 DOI: 10.13189/UJPA.2016.100604
U. Seshavatharam, S. Lakshminarayana
We show that, Schwarzschild radius of Planck mass plays a vital role in electroweak and strong interactions. With reference to the observed large proportionality ratio, , it seems appropriate to consider a large nuclear gravitational constant, . Qualitatively this idea is in agreement with 'Strong gravity' concept proposed by Abdus Salam and C.Sivaram [Mod. Phys. Lett., A8(4), 321- 326. (1993)]. We would like to suggest that, by replacing the Newtonian gravitational constant with the proposed nuclear gravitational constant, predicted high energy levels of String theory can be brought down to the current hadronic scale. Based on this idea, we defined the nuclear Planck mass, and proposed a quantized model mechanism for understanding the hadronic mass spectrum.
我们证明了普朗克质量的史瓦西半径在电弱和强相互作用中起着至关重要的作用。参考观察到的大比例比,,似乎可以考虑一个大的核引力常数,。从质量上讲,这个想法与Abdus Salam和C.Sivaram [Mod. physics]提出的“强引力”概念是一致的。列托人。, 8(4), 321- 326。(1993)]。我们想建议,通过用提出的核引力常数取代牛顿引力常数,可以将弦理论预测的高能级降至当前的强子尺度。基于这一思想,我们定义了核普朗克质量,并提出了理解强子质谱的量子化模型机制。
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引用次数: 8
期刊
Universal Journal of Physics and Application
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