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Volume 57 (1994)
- Issue 6 Pages 392-
- Issue 5 Pages 298-
- Issue 4 Pages 215-
- Issue 3 Pages 139-
- Issue 2 Pages 69-
- Issue 1 Pages 1-
Volume 57, Issue 2
Displaying 1-7 of 7 articles from this issue
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Yang-Hwan Lim, Hiroyuki KOBAYASHI, Hideo OHNO, Naoki OKA, Yusuke OKAWA ...1994 Volume 57 Issue 2 Pages 69-71
Published: April 25, 1994
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSCarbon tissues were exposed in the dichromate solutions adjusted to desired pH values on the range 2.1 to 7.0. Sensitivity decreased with increasing pH value. In strong acidic pH range the sensitivity increased with the increasing ratio of higher molecular weight component (fH) than γ, while in neutral pH range it was independent of fH. With acid-processed pigskin gelatins higher sensitivities were obtained in any case than with lime-processed cattle-bone gelatins.View full abstractDownload PDF (343K) -
Takuji KANEDA1994 Volume 57 Issue 2 Pages 72-77
Published: April 25, 1994
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSTriboluminescence of silver iodobromide (AgBrI) microcrystals was observed at 530nm when insulating vessels and rods were used for the mechanical abrasion of the microcrystals at liquid nitrogen temperature, but was not observed when electroconductive vessels and rods were used. The triboluminescence of the microcrystals was ascribed to be the recombination between electronsand positive holes which were produced by static electricityformed on the surface of the microcrystals during the abrasion.View full abstractDownload PDF (721K) -
Estimation for spectral reflectance of skin with the HDTV color imageNobutoshi OJIMA, Hideaki HANEISHI, Yoichi MIYAKE1994 Volume 57 Issue 2 Pages 78-83
Published: April 25, 1994
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSA new method is introduced to estimate spectral reflectance of skin color used HDTV camera. The output levels RGB from HDTV camera is transformed to tristimulus values XYZ by using polynomial equation. The coefficients of a transformation matrix were determined to minimize the summation of difference between measured and calculated XYZ for 39 kinds of skin color charts by using the least square method.
Principal component analysis for spectral reflectance of 108 facial skin was done, and the result showed that the spectral reflectance of skin color can be calculated by using the only three components, namely tristimulus values XYZ. In this paper, the processing method mentioned above and the experimental results are described.View full abstractDownload PDF (604K) -
Yang-Hwan LIM, Hiroyuki KOBAYASHI, Hideo OHNO, Naoki OKA, Yusuke OKAWA ...1994 Volume 57 Issue 2 Pages 84-85
Published: April 25, 1994
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSGelatin tissues were exposed in the dichromate solutions adjusted to desired pH values in the range of 2.1 to 7.0. From the exposure dependence of the molecular weight distribution of the washed-off gelatin and its pH dependence, was elucidated that in strong acid region the higher molecular weight components have the higher sensitivity, while neutral region the sensitivity is independent of the molecular weight.View full abstractDownload PDF (253K) -
Ikuzo NISHIGUCHI1994 Volume 57 Issue 2 Pages 87-98
Published: April 25, 1994
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSAromatic heterocyclic compounds are known as useful organic materials possessing principle molecular structures for important function of record and display of information.
In this study, novel and convenient methods for synthesis of some benzoheterocyclic compounds from easily available 2-substituted nitrobenzenes were successfully developed through electroreduction, zinc-promoted reduction, reductive carbonylation, and acid-catalyzed intermolecular cyclization.
Thus, useful aromatic heterocyclic compounds, including oxyindoles, 1, 4-benzodiazepinones, 3, 1-dihydrooxazinones, and pridone carboxylic acid derivatives, were efficiently prepared from easily available 2-chloronitrobenzenes and 2-nitrobenzoic acids through electroreduction and zinc-promoted reducton. Furthermore, facile one-pot synthesis of benzazolones, such as benzimidazolones, benzoxazolones and benzthiazolones, and hydroxycoumarines was originally developed by sufur-assisted reductive carbonylation of 2-substituted nitrobenzenes and 2-hydroxylacetophenone, respectively. Finally, acid-catalyzed reaction of propargylic and allylic alcohols with ringsubstituted thiophenols led to selective intermolecular cycloaddition to give readily tetrahydrobenzothiepines and thiochromanes, respectively.View full abstractDownload PDF (1216K) -
Tetsuya ITOH1994 Volume 57 Issue 2 Pages 99-107
Published: April 25, 1994
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSThis paper gives an overview of the challenges of Image Quality Improvement in digital full-color copiers, which represent electorophotographic imaging, and presents prospects for the future. Appling Image Processing Technology and Digital Control of electrophotographic process brought the full-color image quality, which pleased users generally.View full abstractDownload PDF (3434K) -
Kitakyushu Polytechnic Colleoe and An Example of Education for Image TechnologyHiroshi HIRASAWA1994 Volume 57 Issue 2 Pages 108-114
Published: April 25, 1994
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSDownload PDF (981K)
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