著者
山口 作太郎
出版者
社団法人 プラズマ・核融合学会
雑誌
プラズマ・核融合学会誌 (ISSN:09187928)
巻号頁・発行日
vol.78, no.1, pp.19-35, 2002 (Released:2005-12-08)
参考文献数
39
被引用文献数
1

Thermoelectric system has various merits for use in energy conversion because the temperature difference is only required to generate electric power and there are not movable parts in the system. However, thermoelectric system is not so popular in civil use because its energy conversion efficiency is not high in the present time. But if we consider the exergy flow even in a conventional turbine generator, the turbine generator system can not use energy completely, and a symbiotic and/or hybrid system can be applied, which is introduced in the present study. On the other hand, in fusion reactor there are many parts having large temperature difference because plasma temperature is high and superconducting magnets are used. One of the applications for superconducting system is mentioned and is called Peltier current lead. This can reduce heat leak to low-temperature system, and improve the efficiency of the whole system. Recently, material study has progressed, and various kinds of materials are proposed and studied. The magnetic field effect is introduced as investigated by the author's research group. Magnetic field effect was divided into three levels of the categories. One is in the macroscopic level, and this is characterized by the generalized Ohm's equation. The second level is characterized by Boltzmann equation, and in this level we can discuss the macroscopic transport parameters. The third level is the microscopic level and we discuss the band structure to solve the carriers themselves, for example Schrödinger equation. In this paper, our recent activities are mentioned in these fields.
著者
重光 司
出版者
社団法人 プラズマ・核融合学会
雑誌
プラズマ・核融合学会誌 (ISSN:09187928)
巻号頁・発行日
vol.75, no.6, pp.659-665, 1999-06-25 (Released:2001-04-26)
参考文献数
19
被引用文献数
7 11

This paper briefly reviews the effects of electric fields, air ions, and corona discharge on plants. From the middle of the eighteenth century, electric fields and air ions have been applied to plants both in the field and under laboratory conditions. Although many studies have reported beneficial effects, the results have been inconsistent, and the electrical conditions leading to definite benefits cannot so far be predicted. High electric fields have been reported to damage plants by flowing the induced currents caused by corona discharge from the tips. Since the investigations have been continued, the results have been controversial and contradictory. There remains no firm theory governing electrophysiology in plants.
著者
一政 祐輔
出版者
社団法人 プラズマ・核融合学会
雑誌
核融合研究 (ISSN:04512375)
巻号頁・発行日
vol.64, no.6, pp.461-481, 1990-12-20 (Released:2010-10-22)
参考文献数
88

Recent topics in the following studies of biological effects of tritium are reviewed: 1) tritium level in the environment, 2) mechanism of biological conversion of environmental molecular tritium, 3) tritium content of Japanese bodies and foods, 4) uptake and metabolism of molecular tritium in mammals, 5) absorption rate of tritiated water in mammals, 6) metabolism of organically bound tritium in animals, 7) enhanced excretion of tritium from body, 8) RBE of tritium.
著者
河崎 善一郎
出版者
社団法人 プラズマ・核融合学会
雑誌
プラズマ・核融合学会誌 (ISSN:09187928)
巻号頁・発行日
vol.80, no.7, pp.589-596, 2004 (Released:2005-03-16)
参考文献数
24
被引用文献数
1 1

Investigation of lightning discharges has about 250 years history. During these 250 years we have accumulated the knowledge, and the understanding of lightning physics has been done qualitatively. According to the author's understanding our interpretation and understanding about lightning physics is not sufficient. Moreover still we have newly discovered phenomena related with lightning discharge, like discharges from thundercloud top to the ionosphere named RedSprite. The investigation on lightning physics can be concluded as one of the attractive subjects, though it has long history.
著者
嶋田 隆一
出版者
社団法人 プラズマ・核融合学会
雑誌
プラズマ・核融合学会誌 (ISSN:09187928)
巻号頁・発行日
vol.80, no.7, pp.572-577, 2004 (Released:2005-03-16)
参考文献数
9
被引用文献数
1 2

Kinetic energy has been the energy well known since ancient times. The generator with a flywheel is an electric power amplifier that stores electric power and is made to generate large electric power at the short time, and used to be in a nuclear fusion institution. In recent years, the flywheel has been recognized an electric power tool for power stabilization. An example of application in the industry and in an electric power community is introduced. In addition, a characteristic application is developed despite the fact the energy efficiency of compressed air energy storage is generally poor.
著者
時松 宏治
出版者
社団法人 プラズマ・核融合学会
雑誌
プラズマ・核融合学会誌 (ISSN:09187928)
巻号頁・発行日
vol.78, no.11, pp.1186-1191, 2002 (Released:2005-12-08)
参考文献数
15

This paper outlines the use of nuclear fusion as a global warming mitigation technology. Life cycle CO2 emission from a nuclear fusion plant is quite low; it is comparable to that of nuclear fission. Nuclear fusion has the potential to contribute future energy systems and environment. The technological feasibility of nuclear fusion should be demonstrated in order to begin clarifying the potential contribution of nuclear fusion as well as to educate those outside of the fusion community about its potential.
著者
阪上 正信
出版者
社団法人 プラズマ・核融合学会
雑誌
核融合研究 (ISSN:04512375)
巻号頁・発行日
vol.54, no.5, pp.498-511, 1985-11-20 (Released:2011-03-04)
参考文献数
10
被引用文献数
1

Various studies about the behavior of tritium in the environment are reviewed with comments on several origins of their occurances. For atmospheric tritium, different chemical species and their seasonal variation have been studied. The average tritium concentration in river waters was found to be 1.5-2 times higher than that of precipitations at various sites of Japan.The vertical distribution of tritium in ground water has raised an interest for the samples collected from different wells in depth. The effect of the accidental release of tritium and the tritium level around nuclear facilities are also mentioned.
著者
渡辺 二太
出版者
社団法人 プラズマ・核融合学会
雑誌
核融合研究 (ISSN:04512375)
巻号頁・発行日
vol.35, no.3, pp.235-242, 1976 (Released:2011-08-16)
参考文献数
3
被引用文献数
1

この報告は, プラズマ研究所の計算機「HITAC-8500」のための1つのプログラムの報告である。このプログラムは空心円筒コイル群によって作られる磁場を計算し, 1) 磁場のr成分 (=Br), z成分 (=Bz), 磁場の強さ (=√B2r+B2z), ベクトルポテンシアルのφ-成分と軸迄の距離の積 (=rAφ) をラインプリンターに出力し, 2) 磁力線を, コイルの断面図と共に, プロッターで描かせ, 更に3) 磁場の強さが等しい点を結んだ線 (等磁気圧線) もプロッターで描かせることが出来るように製作されている。
著者
渡辺 二太
出版者
社団法人 プラズマ・核融合学会
雑誌
核融合研究 (ISSN:04512375)
巻号頁・発行日
vol.63, no.6, pp.482-507, 1990-06-20 (Released:2011-03-04)
参考文献数
9
被引用文献数
2 4

A highly accurate numerical procedure and its computer program is presented for the calculation of magnetic field produced by body current coils of various shapes.
著者
等々力 二郎
出版者
社団法人 プラズマ・核融合学会
雑誌
核融合研究 (ISSN:04512375)
巻号頁・発行日
vol.57, no.5, pp.318-324, 1987-05-20 (Released:2011-03-04)
参考文献数
3
被引用文献数
6 5

Method to calculate the magnetic field produced by finite size helical coils with an rectangular cross section is derived. The uniform current density across the cross section is assumed. The double integral across the cross section is carried out analytically, and the integral along the axis of the helical coils is carried out numerically. An example of the helical coil wound around a toroid is shown, under the assumption that the edge of the coil is tangential to the toroid.
著者
仁田 旦三
出版者
社団法人 プラズマ・核融合学会
雑誌
プラズマ・核融合学会誌 (ISSN:09187928)
巻号頁・発行日
vol.80, no.7, pp.578-581, 2004 (Released:2005-03-16)
参考文献数
2

The principle, the structure, the features, the history, the state of art development, and the application of Superconducting Magnetic Energy Storage (SMES) are described.
著者
國友 新太
出版者
社団法人 プラズマ・核融合学会
雑誌
プラズマ・核融合学会誌 (ISSN:09187928)
巻号頁・発行日
vol.79, no.1, pp.31-34, 2003 (Released:2005-09-28)
参考文献数
11
被引用文献数
3 3

Cryptosporidium contaminates most surface waters around the world. It is difficult to remove through conventional treatment processes, and is extremely resistant to the method of chemical disinfection typically used to inactivate these microorganisms. We have developed a new technology for inactivating Cryptosporidium oocysts by using a pulsed arc discharge in water, which creates shock waves, UV emissions, and radicals. The pulsed arc is generated between two cylindrical stainless steel rod electrodes, 6 mm in diameter, and 2 mm apart. We applied this method to the inactivation of oocysts in backwash water from a sand-filter unit of a drinking water plant. The results indicate that the major factor influencing inactivation is UV emissions, and that more than 99% of the oocysts in the high turbidity backwash water (80 NTU) are inactivated with an energy of 0.24 kWh/m3.
著者
北川 米喜 千徳 靖彦 田中 和夫 児玉 了祐 西村 博明 中井 光男 乗松 孝好 砂原 淳
出版者
社団法人 プラズマ・核融合学会
雑誌
プラズマ・核融合学会誌 (ISSN:09187928)
巻号頁・発行日
vol.81, no.5, pp.384-390, 2005 (Released:2005-07-29)
参考文献数
24
被引用文献数
1 1

An uniformly imploded deuterated polystyrene (CD) shell target is fast-heated by a Petawatt (PW) laser without cone guide. The best illumination timing is found to be in a narrow region around 80±20 picoseconds from the onset of the stagnation phase, where thermal neutrons are enhanced four to five times by the PW laser of energy less than 10% of the implosion laser. The timing agrees with the timings of enhancement of the X-ray emission from the core and reduction of the Bremsstrahlung radiation from scattered hot electrons. The PW laser, focused to the critical density point, generates the energetic electrons within so narrow angle as 30º, which heats the imploded CD shell, of which the internal energy is 50 J, to enhance thermal neutrons. The increment of the internal energy is 15 J, which seems to agree with the energy reduction of the hot electrons. These results first show that the PW laser directly heats the imploded core without any cone-like laser guide.
著者
中村 幸治 芳野 隆治 Robert GRANETS Gabriella PAUTASSO Otto GRUBER Stephen JARDIN
出版者
社団法人 プラズマ・核融合学会
雑誌
プラズマ・核融合学会誌 (ISSN:09187928)
巻号頁・発行日
vol.78, no.4, pp.347-355, 2002 (Released:2005-12-08)
参考文献数
31

Validation studies of a neutrally balanced vertical plasma position, so-called ”neutral point”, have been carried out by computational simulations and experiments under trilateral Japan-US-EU collaborations. It was clarified that the neutral point, where VDEs (Vertical Displacement Events) are hardly occurred, does exit in the Alcator C-Mod and ASDEX-Upgrade tokamaks as well as the JT-60U, consistent with the simulations. Meanwhile, precise details of the VDE behavior exhibit their own characters according to the individual ofthe tokamaks such as an up-down asymmetry of plasma shape. Sensitivity of the neutral point to the plasma shape and current profile was also addressed in detail.
著者
吉田 善章
出版者
社団法人 プラズマ・核融合学会
雑誌
プラズマ・核融合学会誌 (ISSN:09187928)
巻号頁・発行日
vol.78, no.8, pp.788-791, 2002 (Released:2005-12-08)
参考文献数
2

The Navier-Stokes (NS) system of equations is a central paradigm of nonlinear partial differential equations describing nonintegrable dynamics. The mathematical analysis of the NS system invokes a priori estimates for the energy and enstrophy. The difficulty stemming from the vortex-tube stretching effect is explained. By replacing the convective nonlinear term by a random noise term, one can develop a statistical model of turbulence. The mathematical framework of such modeling is also reviewed.
著者
神野 雅文 本村 英樹
出版者
社団法人 プラズマ・核融合学会
雑誌
プラズマ・核融合学会誌 (ISSN:09187928)
巻号頁・発行日
vol.81, no.10, pp.807-809, 2005 (Released:2005-11-28)
参考文献数
12
被引用文献数
1 1

As interests in environmental friendly products, demands from market for mercury-free fluorescent lamps become stronger. Xenon is the most expected material as a substitution for mercury for fluorescent lamps. So many researches have been done by so many researchers and recently by using external electrode with conventional discharge tube with internal electrodes droved by pulsed discharge has achieved 90 lm/W and 12000 cd/m2. Another effort is using molecular gas as discharge medium. For example Ar-N2 mixture and CO are proposed.
著者
竹田 辰興 彌政 敦洋
出版者
社団法人 プラズマ・核融合学会
雑誌
プラズマ・核融合学会誌 (ISSN:09187928)
巻号頁・発行日
vol.78, no.9, pp.842-856, 2002 (Released:2005-12-08)
参考文献数
57

Applications of neural networks to data analysis and control of fusion plasmas are reviewed. First, a brief introduction to the general features of a neural network is presented, where the neural network is considered as a continuous mapping device, a classification device, a statistical processing device, and a time series predicition device. Then, the applications of neural networks to the research field are explained where the problems to be solved are classified a sfitting function, shaping an experimentally obtained spectrum, analyzing equilibrium quantity, prediction, tomography, and control problems. Throughout the article, we restrict ourselves to description of applications of multi-layer neural networks.
著者
高橋 亮人
出版者
社団法人 プラズマ・核融合学会
雑誌
核融合研究 (ISSN:04512375)
巻号頁・発行日
vol.68, no.4, pp.360-367, 1992-10-25 (Released:2010-10-22)
参考文献数
14
被引用文献数
1

Recent progress of “cold fusion” research is reviewed.Accumulated experimental results in these three years since March 1989 are classified as 1) weak neutron emission, 2) tritium generation with anomalous n/T ratio, 3) charged particle emission with anomality, 4) He-4 generation, 5) large excess heat generation and 6) anomalous enhancement of D/Pd ratio.Resutls of 1) through 4) suggest the existence of unclarified nuclear reactions in Pd (or Ti) /Deuterium systems.Relation between excess heat and nuclear products is yet to be clarified.Subjectives of further research are mentioned.
著者
堀田 栄喜 ポンチャイ カーンパーニット 林 泉
出版者
社団法人 プラズマ・核融合学会
雑誌
核融合研究 (ISSN:04512375)
巻号頁・発行日
vol.44, no.2, pp.115-124, 1980

Dynamic stabilization of high beta plasmas by axial rf current has been theoretically investigated. It is shown that higher-number modes are very easy to be stabilized. In case of m=1 mode, if there is no conducting shell, the shorter wave-length instabilities can be stabilized, but the stabilized wave-number region is very narrow. When the plasma column is surrounded by a concentric conducting shell, however, the stabilizing force of the rf image current induced in the conducting shell is so effective that the long wave-length m=1 mode can be perfectly stabilized by very small rf current.