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Volume 60 (1997)
- Issue 6 Pages 348-
- Issue 5 Pages 293-
- Issue 4 Pages 228-
- Issue 3 Pages 140-
- Issue 2 Pages 75-
- Issue 1 Pages 2-
Volume 60, Issue 4
Displaying 1-5 of 5 articles from this issue
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Nucleation of silver halide grains by dihydropyridinesNaoki OBI, Jun TAKEUCHI, Yasuhiko KOJIMA, Yasuo SHIGEMITSU1997 Volume 60 Issue 4 Pages 228-231
Published: August 25, 1997
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSNucleation mechanism of a high contrast system using pyridinium salts was studied. 1-Benzyl-1, 4-dihydronicotinamide (BNAH) was used as a model compound of dihydropyridine derivatives. It was found that BNAH itself does not nucleate silver halide grains but that the oxidation product of BNAH by Fe (CN) 63- is able to reduce (nucleate) silver halide grains to make them developable. The results support the hypothesis that dihydropyridine is an intermediate for the nucleation.View full abstractDownload PDF (488K) -
Yukio OKANO1997 Volume 60 Issue 4 Pages 232-240
Published: August 25, 1997
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSMTF (Modulation Transfer Function) is one the most important characteristics of digital still cameras. Imaging characteristics of 3-CCD digital still camera which has dual-green system are analyzed from the view point of MTF.
The designed MTF for 3-CCD camera in which the MTF values are higher than unity are compared with measured MTF. The measured MTF by slanted edge method show the similar curve with calculated MTF. The measured MTF using sin-wave chart shows the low MTF value because of low-contrast chart.View full abstractDownload PDF (4749K) -
Hiroko ARAI, Masuo TANAKA, Souichi KUBO1997 Volume 60 Issue 4 Pages 241-247
Published: August 25, 1997
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSAutochrome plate is the first commercial color process and was used during 1907-1933. Today, the colors of the plates showing several differences due to deterioration of the filter dyes. In this study, the colors of the additive primary micro grain filters of Autochrome Plates were examined spectromicroscopically. It was found that the color fading of the plate occurred mainly in the blue primary color. On the other hand, little color fading in the green and red primary colors were observed. By the result, a significant suggestion for conservation of faded Autochrome Plate was obtained. It was also found that the display primaries of Autochrome Plate close to those of modern color television system.View full abstractDownload PDF (6008K) -
Yoshiro YONEZAWA, Kenji ASAMI, Hideaki ISHIZAWA1997 Volume 60 Issue 4 Pages 248-256
Published: August 25, 1997
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSWe have taken up several cyanine dyes capable of forming the J-aggregate in the monolayer assemblies (LB films); thiacarbocyanine dye (Th (φ)), naphthothiacarbocyanine dyes (Nap (Et), Nap (φ)), quinocyanine dyes (Pic, Sch), oxacyanine dye (Oxa), thiacyanine dye (Tha). We have fabricated the mixed J-aggregate in the LB films incorporating two kinds of dyes having similar molecular structure; Th (φ) +Nap (φ), Oxa+Tha, Nap (Et) + Nap (φ), Pic + Sch. A single J-band was evident in the Th (φ)/Nap (φ)/C20 LB film and the Nap (Et)/Nap (φ)/C20 LB film. On the other hand, two J-bands were observed in the Oxa/Tha/HD LB film and the Pic/Sch/C20 LB film. A coherent potential approximation (CPA) has been introduced to examine absorption spectra of the mixed J-aggregates. It has been proposed that the combinations: Th (φ) + Nap (φ) and Nap (Et) + Nap (φ) yield an amalgamation-type (HA) aggregate, while the combination: Oxa + Tha could form a persistence-type (HP) aggregate. The combination: Pic+ Sch seems to have an ambiguous character between the HA- and the HP-aggregates.View full abstractDownload PDF (948K) -
Shohei AOYAGI, Hiroyuki MATSUDA, Yoshiaki UENO, Keisuke HASHIGUCHI1997 Volume 60 Issue 4 Pages 257-262
Published: August 25, 1997
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSIt has been believed that intermolecular structure of gelatin in solution were stable to dilution at constant temperature. This significant factor for CD measurements was examined: 0.25% solution was matured at constant temperature and measured (1) directly or (2) after dilution to 0.01%. The comparison of the intensities of 221 nm peak after normalization by concentration and cell length has been shown a slight dissociation of gelatin structures. More dissociation has been found when the maturation temperature was lower. Furthermore at 5°C, the intensity of the original 0.01% solution has overtaken the value of the 0.01% solution prepared by dilution and approached even to that of 0.25% solution. The difference in the temperature dependence found for different concentrations may be a CD indication for a differentiation of single-chain from inter-chain triple-helix.View full abstractDownload PDF (676K)
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