著者

井上 薫 山崎 正之

出版者

東海大学

雑誌

東海大学紀要. 工学部 (ISSN:05636787)

巻号頁・発行日

vol.45, no.2, pp.19-22, 2006-03-31

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Some students in their study of wave motion have asked us "could you explain the contradiction that exists between the principles of superposition of waves and the energy conservation law?" We will answer the question in this paper. This question arises from their focusing only on either the constructive or destructive aspect of superposition of waves. They must pay attention to both aspects of superposition.

著者

横地 明

出版者

東海大学

雑誌

東海大学紀要. 工学部 (ISSN:05636787)

巻号頁・発行日

vol.34, no.1, pp.159-167, 1994

被引用文献数

3

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Polystyrene latex (PSL) particles are the most widely used as the particle size standards for the calibration of light scattering particle sizing instruments (Optical Particle Counter). Size measurement of PSL particles in the size range from 0.100 to 1.001 μm were taken by Laser Particle Counter (LPC) (PMS : LAS-X, ASAS-X) and Differential Mobility Analyzer (DMA). It was found that, for some particles, there were differences between particle size measured by LPC or DMA, and that of nominal diameters given by the manufacture of the latex particles.

著者

森田 定市

出版者

東海大学

雑誌

東海大学紀要. 工学部 (ISSN:05636787)

巻号頁・発行日

vol.1968, no.2, pp.213-225, 1968

著者

東 保男 野上 勝憲 大島 信男

出版者

東海大学

雑誌

東海大学紀要. 工学部 (ISSN:05636787)

巻号頁・発行日

vol.33, no.1, pp.153-160, 1993

被引用文献数

1

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The monodispered ferric oxide (ferric oxyhydrate) particles were synthesized by the hydrolysis of ferric nitrate in an aqueous nitric acid solution at high temperature. The precipitated particles were examined by TEM, XRD, TG-DTA and S_BET. The ferric nitrate solutions of different concentration dissolved in 0.01 mol/l nitric acid were aged for 24hr at 95℃, and the morphologies of the precipitated particles were observed, and it was found that the shapes of the particles precipitated from 0.5,0.2,0.005∿0.1,0.003 and 0.001 mol/l of ferric nitrate solutions were cubic, ellipsodial, fine grain, spherical and irregular, respectively. The cubic particles (by-products : ellipsodial particles) precipitated from the 0.3 mol/l ferric nitrate solution containing 0.05 mol/l nitric acid were goethite, and the ellipsodial particles from 0.03 mol/l solution were hematite. The latter particles were porous, and its specific surface area was calculated as 52∿98m^2/g. The ferric ion concentration of 0.05 mol/l ferric nitrate solution was decreased at one step with aging time, but as for 0.3 mol/l solution the ferric ion concentration was decreased at two steps, and the pH values of the solutions were shifted to acidic. ⊿G_desovl. were calculated as 115 and 135 kJ/mol by Bourne's equation. When the concentration of ferric nitrate was high, the precursors of iron aquacomplex were formed, and then goethite was precipitated by the polymerization of precursors, but in the case of low concentration of ferric nitrate, hematite was obtained immediately.

著者

岩田 利枝 フェルズ マルティナ フォーデン マリナス ファン デル

出版者

東海大学工学部

雑誌

東海大学紀要. 工学部 (ISSN:24343633)

巻号頁・発行日

vol.39, no.1, pp.137-142, 1999-10-30

著者

岩田 利枝 フェルズ マルティナ フォーデン マリナス ファン デル

出版者

東海大学

雑誌

東海大学紀要. 工学部 (ISSN:05636787)

巻号頁・発行日

vol.39, no.1, pp.137-142, 1999

被引用文献数

1

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In order to examine the validity of the existing glare evaluation methods, an experiment with 40 Dutch subjects was conducted using artificial sky and actual sky. First the difference in the sensitivity to glare caused by artificial sky between light colored eye and dark colored eye was examined. The variance analysis showed that there was no significant difference in the evaluation between light colored and dark colored eyes. The result was also compared with PGSV, a glare index derived from an experiment using judgements of Japanese subjects. The evaluation by the Dutch subjects was lower than PGSV in the case of lower source luminance, but it was higher in the case of higher luminance. Further study is required to identify the effect of the cultural difference on sensitivity to glare. Secondly the difference in evaluation between artificial sky and actual sky was examined. Glare sensation against the actual sky was lower than that against artificial sky and PGSV. Luminance distribution of actual sky was less uniform than that of artificial sky and the average color temperature of actual sky was higher than that of artificial sky. However, the difference in luminance distribution and color temperature between the actual sky and the artificial sky did not explain the difference in glare sensation between both skies.

著者

石井 壮一郎 片山 恵一

出版者

東海大学

雑誌

東海大学紀要. 工学部 (ISSN:05636787)

巻号頁・発行日

vol.41, no.2, pp.65-70, 2002-03-31

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Rechargeable batteries are in fashion as energy sources for electronic appliances such as mobile phones and lap-top computers. Lithium ion secondary batteries are one of the most promising energy devices. In this review, the current research on lithium ion secondary batteries was briefly described, and especially, the problems and future prospects of the cathode materials were presented.

著者

中本 健二郎 福本 秀夫 室谷 裕志 若木 守明

出版者

東海大学

雑誌

東海大学紀要. 工学部 (ISSN:05636787)

巻号頁・発行日

vol.44, no.2, pp.13-18, 2005-03-31

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Microlenses were formed directly on the surface of a glass plate by using a CO_2 laser. This method has the merit of enabling completely dry processing and presents a simple means of microlens fabrication. We discuss the formation process and mechanism on the basis of the characterization of irradiation parameters and the glass composition. When the surface of a glass plate is heated locally to the working point of the glass material with a focused CO_2 laser beam, a microlens is formed owing to surface tension. It was found to be possible to fabricate microlenses easily by controlling the laser power and irradiation time. The shape of the fabricated microlenses was found to be dependent on laser irradiation energy (laser power x irradiation time) and irradiated position. When a Corning 7059 glass plate was used, a convex microlens was obtained at an energy density less than approximately 100 (μJ/μm^2 ). The dynamical stress change of the microlenses was measured in situ by T-FDP (four detectors polarimeter of transmission type) type ellipsometry analysis to elucidate their formation process.

著者

シンドゥパック アカディ 村上 俊太郎 和田 努

出版者

東海大学

雑誌

東海大学紀要. 工学部 (ISSN:05636787)

巻号頁・発行日

vol.32, no.2, pp.151-157, 1992

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The transmission loss of silencers composed of Helmeholtz type resonators are computed on the basis of the one-dimensional linearized theory. The theoretical transmission loss characteristics in the middle frequency range are verified experimentally. The performance of these multiple resonators improves with increasing of the number of resonators, and it is unaffected by the flow which has the central velocity below 20 m/s.

著者

鈴木 裕一 山﨑 俊裕

出版者

東海大学工学部

雑誌

東海大学紀要. 工学部 (ISSN:05636787)

巻号頁・発行日

vol.53, no.2, pp.49-55, 2013

著者

岡崎 健伍 中村 勲 磯村 雅夫

出版者

東海大学

雑誌

東海大学紀要. 工学部 (ISSN:05636787)

巻号頁・発行日

vol.46, no.2, pp.47-54, 2006

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We have developed an optical simulation method to predict the performance of heterojunction with intrinsic thin layer (HIT) solar cells. In this simulation, the energies of reflected and absorbed light in each layer are calculated using the wave equations of electromagnetic waves. The HIT solar cells have combined structures with thin and thick layers. Therefore, we have developed a simulation technique, in which interference effects occur only in thin layers and average intensity is considered in thick layers. The simulation predicts the amount of absorbed light in each layer of the HIT solar cells. The results show that TiO_2, antireflective (AR) layers enhance the current density by about 1.3mA/cm^2, and that one of the problems of HIT solar cells is the optical absorption in p, i and n-type amorphous silicon (a-Si) layers. In accordance with the simulation results, we have developed wide-gap hydrogenated a-Si by reactive sputtering using Ar-H_2 mixture gases. The simulation predicted that the current density of HIT solar cells can be improved by 1.5mA/cm^2 using the developed a-Si, compared with using the conventional wide-gap a-Si.

著者

松沢 修一 平井 慶彦

出版者

東海大学

雑誌

東海大学紀要. 工学部 (ISSN:05636787)

巻号頁・発行日

vol.33, no.1, pp.49-57, 1993

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In this paper, the concepts of the exergy and of the mixture exergy are introduced. Based on these concepts, it is shown that the mixture exergy can convert to the electric energy electro-chemically. We named the device developed by the principle of exergy "mixture exergy cell" (MEC). The output characteristic of MEC is mesured. Form the experimental results, it is found that the energy density of MEC is superior to that of the concentration cell used at the circumstanced temperature.

著者

江口 智 平尾 邦雄 松尾 弘毅 石井 信明

出版者

東海大学

雑誌

東海大学紀要. 工学部 (ISSN:05636787)

巻号頁・発行日

vol.32, no.2, pp.187-197, 1992

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This paper describes the guidance strategies of solar sails which leave the circular orbit with 50,000km radius around the earth towards the moon. The solar sail is a spacecraft which is thrust by the light pressure (radiation pressure) of the sun. The design of the orbit targeting the moon using the solar sail is complicated due to reasons as follows : 1) The thrust obtained by the solar light pressure is so small that the long flight time is needed in the lunar mission. 2) As the thrust vector is determined by the relative angle between the sun and the sail, magnitude and direction cannot be controlled independently with a sail. One of the typical control method of the solar sail is "Maximum velocity increment control", where the sail direction is always kept along the instantaneous velocity of the spacecraft to get the maximum acceleration. It is efficient to increase the radius of orbit in the initial phase, but insufficient in the last phase to hit the moon. Therefore, other control procedure should be adopted to approach to the lunar orbit. In this approaching phase maneuver, the principle of "Maximum velocity increment control" is still used in conjunction with the control of the magnitude of acceleration between zero and 100% of the maximum level, which can be achieved by means of the specially designed sail. With this method, the apogee distance as well as the arrival time to the apogee can be adjusted to hit the moon. The most efficient time to switch from the initial to the approaching phase is also discussed with R-T (the apogee distance the apogee passage time) diagram proposed in this paper.

著者

林 義正 鍋島 久浩

出版者

東海大学

雑誌

東海大学紀要. 工学部 (ISSN:05636787)

巻号頁・発行日

vol.36, no.2, pp.187-195, 1996

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New technologies, acquired for race cars through rigorous pursuit of the three most important performance criteria of an automobile, are subsequently applied their ways to the actual production. Running performance of a battery powered electric vehicle was investigated based on informations associated with high performance endurance race vehicles. By utilizing newly developed circuit driving simulation program, the electric racing cars performance on the LeMans 24-hour endurance race was predicted : such race circuit requires vehicles to withstand durability equivalent to 500,000 km run on ordinary road. The layout of the electric race vehicle was also designed on the structural study of the race cars to achieve the performance goal. As a result, it was found that the electric vehicle, even with a disadvantage of heavy battery weight, has an equal running performance compared to gasoline engine powered race cars. Also, the electric vehicle's efficiency of energy conversion from crude oil was found to be 50% higher than the gasoline engine cars.

著者

尾身 朝子

出版者

東海大学

雑誌

東海大学紀要. 工学部 (ISSN:05636787)

巻号頁・発行日

vol.45, no.2, pp.11-17, 2006-03-31

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電子ジャーナルのオープンアクセスの動きは米国の国立衛生研究所(NIH)の助成研究成果論文公開の方針で新しい段階を迎えた。NIHは2004年9月に助成研究の成果については、論文刊行後6ヵ月以内にNIHの電子ジャーナルサービスPubMed Centralにその最終原稿の電子版を提供し、無料公開するように求める提案をおこない、同時に公開意見募集をおこなった。その結果を受け、2005年2月に最終方針を発表したが、そこでは出版社の意向を汲んで論文刊行後12ヵ月以内に変更され、この方針は2005年5月2日から実施された。本稿では、この方針が生まれるに至った経緯やこの提案・方針に関して関係団体や学会・出版社の意見などを解説した。さらにわが国の学会出版への影響についても論じた。