Showing papers by "Chiba Institute of Technology published in 1987"
TL;DR: In this paper, the authors introduce the present situation of sheet metal forming with hydraulic counter pressure and some examples of the formed parts in Japan, and some advantages are higher forming limit, higher accuracy of drawn parts, achievement of complicated shape and adoption of simplified drawing die.
79 citations
TL;DR: In this article, the equilibrium positions of a superconducting magnetic levitation system which substitutes an electromagnetic energy for a mechanical energy is studied for the absolute determination of the magnetic flux quantum Φ 0.
Abstract: A study of the equilibrium positions of a superconducting magnetic levitation system which substitutes an electromagnetic energy for a mechanical energy is in progress for the absolute determination of the magnetic flux quantum Φ 0 . The study on a preliminary system at ppm-level resolution has been done and the reproducibility of the trajectory turned out to be of the order of 10 ppm. The problems of the present system and ideas for the next system at the sub-ppm level are discussed.
35 citations
Journal Article•
TL;DR: In this paper, a numerical method of solving fully nonlinear MHD equation is described, in particular, the formulation based on the newly developed method of projected characteristics (Nakagawa, 1981) suitable to study the evolution of magnetic arches due to motions of their foot-points is presented.
Abstract: A numerical method of solving fully nonlinear MHD equation is described. In particular, the formulation based on the newly developed method of projected characteristics (Nakagawa, 1981) suitable to study the evolution of magnetic arches due to motions of their foot-points is presented. The final formulation is given in the form of difference equations; therefore, the analysis of numerical stability is also presented. Further, the most important derivation of physically self-consistent, time-dependent boundary conditions (i.e. the evolving boundary equations) is given in detail, and some results obtained with such boundary equations are reported.
30 citations
21 citations
15 citations
TL;DR: In this article, the surface analysis, surface hardness, wear, and corrosion of chromium films with nitrogen and argon ions were characterized by surface analysis and X-ray photo-electron spectroscopy, and the near-surface hardness of nitrogen-implanted chromium was measured with a Vickers microhardness test and a dynamic ultramicrohardness tester.
15 citations
TL;DR: The protection of the O 6 -amide and N 2 -amino groups of guanosine with the (butylthio)carbonyl group is described and could be rapidly introduced in good yields and removed very easily under the conventional deprotective condition for the exo -aminoside bases.
11 citations
TL;DR: In this paper, the authors investigated the hot-hardness and the indentation creep characteristics of polycrystalline pure metals at elevated temperatures and found that the hot hardness started to decrease quickly with increasing temperature in the range from 0.35 to 0.68 Tm (where Tm was melting point on the absolute scale).
Abstract: Synopsis : In this study, eighteen kinds of polycrystalline pure metals were provided to investigate the hot-hardness and the indentation creep characteristics at elevated temperatures. The inflection temperatures where the.hot-hardness started to decrease quickly with increasing temperature were observed in the range from 0.35 to 0.68 Tm (where Tm was melting point on the absolute scale), and were calculated as 0.49 Tm on the average. However, in some semi-conductor metals such as Si or Ge, the second inflection temperature appeared. The slope of the plot of logHV-logt (t was indentation creep time in sec.) which was defined as "indentation creep rate" was the largest in Mo and the smallest in Si at 0.60 Tm. There was a tendency for the indentation creep rate to increase linearly with increasing homologous temperature, and the slope of the line was the largest in bcc and it became smaller with fcc and cph systems. On the other hand, in the case of semiconductors the indentation creep rate decreased with increasing temperature up to the second inflection temperature. The activation energies of pure metals calculated from the indentation creep were close to those for selfdiffusion.
9 citations
TL;DR: The protection of the O6-amide group of guanosine and the N3-imide group of uridine with the (butylthio) carbonyl group is described.
Abstract: We describe the protection of the O6-amide group of guanosine and the N3-imide group of uridine with the (butylthio) carbonyl group. This group is introduced in good yields and is cleaved under mild conditions.
7 citations
TL;DR: In this paper, single crystals of gallium analogs of K + - and NH + 4 -β-β-alumina (K + -β″-gallate) were synthesized by ion exchanging Na + − β − β-nodes for Ga 3+ ions at the middle of spinel block.
7 citations
TL;DR: In this article, the dependence of electrical characteristics of copolymer complexes on ambient humidity was studied for quaternized 4-vinylpyridine-styrene copolymers/perchlorate complexes.
Abstract: The dependence of electrical characteristics of copolymer complexes on ambient humidity was studied for complexes of quaternized 4-vinylpyridine-styrene copolymer/perchlorate complexes. When the 4-vinylpyridine content in the copolymer increased, a linear decrease in resistivity was found. From this behaviour, it is concluded that the resistivity can be freely set by variation of the 4-vinylpyridine content in the design of a sensor material. Furthermore, the resistivity was the smallest in the HClO4 complex and successively became large in the order of the KClO4 complex and the LiClO4 complex. From the electrochemical aspect, it was cleared that the degree of dissociation of the counterion exerted influence upon the resistivity of these complexes.
Die Abhangigkeit der elektrischen Kennlinie von Copolymerkomplexen von der umgebenden Feuchtigkeit wurde fur quaternisierte 4-Vinylpyridin-Styrol-Copolymer/Perchlorat-Komplexe untersucht. Mit steigendem 4-Vinylpyridingehalt im Copolymeren wurde ein linearer Anstieg des elektrischen Widerstandes beobachtet. Aus diesem Verhalten wurde die Annahme abgeleitet, das der elektrische Widerstand durch Variation des 4-Vinylpyridingehalts frei gewahlt werden kann, um Sensormaterialien zu konzipieren. Auserdem ist die Leitfahigkeit beim HClO4-Komplex am geringsten und steigt in der Reihe HClO4-Komplex, LiClO4-Komplex sukzessive an. Den elektrochemischen Aspekt betreffend wurde festgestellt, das der Dissoziationsgrad des Gegenions einen Einflus auf den elektrischen Widerstand des Komplexes ausubt.
TL;DR: In this paper, the authors present a list of the most frequently used phrases: (1) 最も好むシートはどの段階のものが好まれた, (2) クッション性の柔らかさ, (3) 硬さの違いをどの程度まで区別できるか, の2項目について調査し
Abstract: この実験は, 自動車シートのクッション性について柔らかき, 硬さに差異のある5種類のシートを準備し, これにさまざまな属性をもつ被験者404人を腰かけさせ, (1) 最も好むシートはどの段階のものか, (2) クッション性の柔らかさ, 硬さの違いをどの程度まで区別できるか, の2項目について調査し, 今後のシート設計のための参考資料を求めようとするものである.試験の結果は次のとおりであった.(1) 硬いシートも柔らかいシートも好まれず, 中間の段階のものが好まれた.(2) 一般の人は, 静的な条件のもとでは柔らかさの違いをかなり細かい段階まで区別できる.(3) シートの柔らかさについての嗜好は, 職業別, 体形別などの属性によって差がみられる.
01 Jan 1987
TL;DR: In this article, the output power and electrical conversion efficiency of a closed-cycle subsonic flow cw CO transverse EDL were modeled using a multi-vibration-level model, a semi 1-dimensional flow model, and a plane parallel cavity model.
Abstract: A computer simulation has been carried out in order to parametrically analyze and predict the output performance characteristics of a closed-cycle subsonic flow cw CO transverse EDL. The simulation is based on a multi-vibration-level model, a semi 1-dimensional flow model, and a plane parallel cavity model. As a function of parameters such as gas temperature, pressure, flow velocity, discharge current, and cavity conditions, the output power and electrical conversion efficiency of CO EDL have been analyzed.
TL;DR: In this paper, Cadmium sulfide (CdS) was encapsulated in poly(methylmethacrylate), poly(styrene) or poly(vinyl carbazole) by the encapsulating polymerization process, and its photoconductivity was investigated.
Abstract: Cadmium sulfide (CdS) was encapsulated in poly(methylmethacrylate), poly(styrene) or poly(vinylcarbazole) by the encapsulating polymerization process, and its photoconductivity was investigated. As result, it was observed a remarkable light-sensitive effect. The light sensitive effect of CdS encapsulated in poly(methylmethacrylate) (C-MMA-CdS) is particularly marked and depends largely on the encapsulation rate. The photosensitive mechanisms of encapsulated cadmium sulfide (C-CdS), CdS material, and CdS/polymer dispersion composites were discussed and compared. Furthermore, the temperature dependence of the dark current and the initial rising rate of the sensitizing photocurrent were studied.
Die Photoleitfahigkeit von mit Poly(methylmethacrylat), Poly(styrol) oder Poly(vinylcarbazol) umhulltem Cadmiumsulfid wurde untersucht. Dabei konnte ein bemerkenswerter lichtempfindlicher Effekt festgestellt werden. Der lichtempfindliche Effekt von in Poly(methylmethacrylat) eingekapseltem Cadmiumsulfid ist besonders ausgepragt und hangt stark von der Einkapselungsgeschwindigkeit ab. Die Sensitiverungsmechanismen fur eingekapseltes Cadmiumsulfid (C-CdS), Cadmiumsulfid alleine und Cadmiumsulfid-Polymermischungen wurden erortert und miteinander verglichen. Weiterhin wurde die Abhangigkeit des Dunkelstroms und die Anstiegsgeschwindigkeit des Photostroms von der Temperature untersucht.
TL;DR: In this article, the thermal decomposition processes and ionic conductivities of NH 4 + -s′'-gallate and Zn 2+ -doped NH 4 − s′'-s′"-gallate were investigated.
TL;DR: In this article, the authors present the nonlinear boundary value problem, where Ω is a simply connected and bounded domain in R2 with smooth boundary, and discuss the possibility of the connectedness between the branch of minimal solutions and that of Weston-Moseley's large solutions.
Abstract: Publisher Summary This chapter presents the nonlinear boundary value problem, where Ω is a simply connected and bounded domain in R2 with smooth boundary. The chapter discusses the possibility of the connectedness between the branch of minimal solutions and that of Weston–Moseley's large solutions. The existence of a solution branch connecting them when Ω is close to a disk is shown.