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Volume 71 (2008)
- Issue 6 Pages 400-
- Issue 5 Pages 308-
- Issue 4 Pages 219-
- Issue 3 Pages 127-
- Issue 2 Pages 50-
- Issue 1 Pages 3-
Volume 71, Issue 5
Displaying 1-11 of 11 articles from this issue
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Tadaaki TANI2008 Volume 71 Issue 5 Pages 308-317
Published: October 25, 2008
Released on J-STAGE: January 04, 2011
JOURNAL FREE ACCESSNuclear emulsions including those for OPERA and dark matter detection are characterized in the overview of photographic emulsions with respect to the grain size dependence of their sensitivity, which is proportional to the product of the light absorbance and efficiency of latent image formation in silver halide grains in the emulsions. The emulsions are classified into three groups. The grains in Class I, which are larger than 0.5μm in diameter, are highly sensitive owing to their large light absorbance and used for color films. The grains in Class II, which are 0.1-0.5μm in diameter and include those for OPERA films, are principally defect-free and therefore afford efficient latent image formation. The grains in Class III, which are smaller than 0.1eV and expected to be available for dark matter detection, are still poorly understood and interesting to study from the viewpoints of the formation and characterization of quantum-sized grains together with their sensitivities in the presence of very small number of sensitization centers, impurity ions, and fog centers in each grain.View full abstractDownload PDF (3297K) -
Hiroyuki TANAKA2008 Volume 71 Issue 5 Pages 318-323
Published: October 25, 2008
Released on J-STAGE: January 04, 2011
JOURNAL FREE ACCESSWe have developed the novel emulsion imaging system to survey the internal structure of a volcano. We successfully obtained the high resolution radiographic image of conduits of Mt. Asama and 1944 lava dome of Usu by analyzing the data as obtained with a few-month observation. The portable, cost-effective and completely power-free photographic system can be a very powerful tool for cosmic-ray muon radiography of a volcano.View full abstractDownload PDF (1808K) -
Yoshitaka TAIRA, Kunihiro MORISHIMA, Kaname HAMADA, Toshiyuki NAKANO, ...2008 Volume 71 Issue 5 Pages 324-326
Published: October 25, 2008
Released on J-STAGE: January 04, 2011
JOURNAL FREE ACCESSNuclear Emulsion is a detector that have high position resolution, sub-micron. Nuclear Emulsion can measure particle ID, angle distribution, momentum distribution and flux. We measured radiations scattering around accelerator UVSOR. Emulsion could measure the source and the propagation of radiations. So we got the result that Emulsion is very effective to measure radiations around accelerator.View full abstractDownload PDF (5548K) -
Yoshifumi TAKASHIMA, Masahiro KATOH, Masahito HOSAKA, Naoto YAMAMOTO, ...2008 Volume 71 Issue 5 Pages 327-331
Published: October 25, 2008
Released on J-STAGE: January 04, 2011
JOURNAL FREE ACCESSNagoya University has been promoting a project to construct a new synchrotron radiation facility since 1991. The project is now developed to “Central Japan Synchrotron Radiation Research Facility” as the principal facility of the project of Aichi prefecture, “Knowledge Hub”, to establish a new research center for technological innovations. We introduce accelerators of the facility and its applications for nuclear emulsion experiments.View full abstractDownload PDF (1011K) -
Jun KAWARABAYASHI, Kunihiro MORISHIMA, Tatsuhiro NAKA, Kenichi WATANAB ...2008 Volume 71 Issue 5 Pages 332-334
Published: October 25, 2008
Released on J-STAGE: January 04, 2011
JOURNAL FREE ACCESSNuclear emulsion is an excellent three-dimensional position sensitive charged particle detector. We proposed two kind of new applications of this nuclear emulsion to nuclear engineering region. One is a standard detector as a fluence monitor of several keV neutrons. The other is an evaluation of sub-criticality of spent fuel for the purpose of critical safety. Development of the nuclear emulsion in the engineering area will actively be done in near future.View full abstractDownload PDF (629K) -
Marcos DRACOS2008 Volume 71 Issue 5 Pages 335-337
Published: October 25, 2008
Released on J-STAGE: January 04, 2011
JOURNAL FREE ACCESSNeutrino nature and absolute mass scale are major questions in particle physics which cannot be addressed by the present neutrino oscillation program. To answer these two questions, several neutrinoless double beta decay experiments are underway or planed for the near future. These experiments, mainly use bolometric techniques or gaseous counters coupled with scintillator detectors. The energy resolution is better in bolometric experiments but experiments coupling tracking with calorimetry have the advantage of observing the two electron tracks and remove many background sources. Here, we present a proposal of using nuclear emulsions to observe double beta decays. This technique has the advantage of precise tracking and vertexing even for low energy electrons.View full abstractDownload PDF (1220K) -
[in Japanese], Mark AKSELROD, Jeff SYKORA, Eric BENTON, Nakahlro YASUD ...2008 Volume 71 Issue 5 Pages 338-340
Published: October 25, 2008
Released on J-STAGE: January 04, 2011
JOURNAL FREE ACCESSA novel Al2O3 fluorescent nuclear track detector (FNTD) has demonstrated sensitivity and functionality superior to that of existing nuclear track detectors. Non-destructive readout of the detector is performed using a confocal fluorescence microscope and can be imaged as similar image to that of nuclear emulsion. This detector has no fading and has capability of multi time readout. We have verified a linear response of detector signal ranging from 1 to 1, 000 keV/μm. This detector and readout system can be used for various new radiation fields such as space radiation circumstance.View full abstractDownload PDF (1219K) -
Tatsuhiro NAKA, Mitsuhiro NAKAMURA, Osamu SATO, Toshiyuki NAKANO, Kimi ...2008 Volume 71 Issue 5 Pages 341-348
Published: October 25, 2008
Released on J-STAGE: January 04, 2011
JOURNAL FREE ACCESSWe got understanding that about 80% matter in the universe was unknown Matter from observed precise data for universe inrecent year. We know that unknown matter exist in our galaxy. We call this “Dark Matter” and expect to exist as WIMP (Weakly Interacting Massive Particle).
Now, many experiment groups are searching the WIMP by using the principle that detects the nuclear recoil from WIMP all over the world. And they try to confirm existence of WIMP from variation of signal has annual modulation by the earth's yearly round. However this way is difficult to get high reliability because variation is only few % and is needed long running time.
Here we consider directional WIMP search with Nuclear Emulsion. WIMP velocity is expected to have anisotropy at the earth. If we can detect the nuclear recoil track with nuclear emulsion, we can confirm existence of WIMP from daily modulation of direction anisotropy. We can expect high reliability search by this way.
We developed high resolution emulsion “NIT”, and checked it is able to detect the nuclear recoil track (-100nm) by using low velocity Kr ion, and confirmed the track by electron microscope. And we developed new way to recognize nuclear recoil track by optical microscope because WIMP search need big volume detector. Then we controlled sensitivity of NIT to reject electron background. By this way, rejection power of electron was estimated more than 10-5View full abstractDownload PDF (2262K) -
II. Color-Forming Development, Part 3. Kodak Built a Mass of Dominant Technologies in the 1940's and 50'sYasushi OISHI2008 Volume 71 Issue 5 Pages 349-367
Published: October 25, 2008
Released on J-STAGE: January 04, 2011
JOURNAL FREE ACCESSIn the 1940's and 50's Kodak focused on improving color reproduction of its coupler-incorporated color materials. New chemicals, such as developing agents and couplers, were sought systematically on basis of fundamental researches. The most remarkable results were the couplers of 3-acylamino-5-pyrazolone magenta and pivaloyl-acetanilide yellow, discovered by A. Weissberger, P. Vittum and others; and the color masking with colored coupler invented by W. Hanson, Jr. On the engineering side, the new technology of simultaneous multiple coating, invented by T. Russell and his colleagues, not only improved dramatically the productivity and uniformity of sensitized materials, but also expanded the dimension of materials design. About 1960 Kodak's technologies had reached the primary stage of completion and were to be followed by the industry.View full abstractDownload PDF (3484K) -
Naoya MATSUMOTO, Tokiya ABE, Hideaki HANEISHI2008 Volume 71 Issue 5 Pages 368-374
Published: October 25, 2008
Released on J-STAGE: January 04, 2011
JOURNAL FREE ACCESSWhen a color video system with highly accurate color reproduction is designed, a good measure for evaluating the image quality including the color reproduction is required. Especially, in codec of motion pictures a good measure is strongly desired to determine a proper compression rate (bit rate). In this paper, we focus on the image quality of motion pictures compressed by H.264/AVC codec which is receiving increased attention. In this study, we investigated the usefulness of SCIELAB. At first, S-CIELAB color difference calculation was applied to the frames of motion pictures after H.264/AVC codec. The performance was better than CIELAB color difference but not satisfactory. We then limited the region of calculation of CIELAB color difference to the smooth regions where compression error tends to attract attention of observers. Experimental results showing that the modification is promising were obtained.View full abstractDownload PDF (4683K) -
Naokazu AOKI, Daisuke OTANI, Hiroshi ARAI, Yuki MASUDA, Hiroyuki KOBAY ...2008 Volume 71 Issue 5 Pages 375-379
Published: October 25, 2008
Released on J-STAGE: January 04, 2011
JOURNAL FREE ACCESSThe portrait paintings of young ladies by Renoir are very popular, especially his expression of skin color. The aim of this research was to create a photographic portrait possessing Renoir's style expression in skin colors. His expression techniques of skin colors were analyzed and their mean and variance were measured separately for cheeks, lips, and the other facial skin color areas. These techniques were then applied to the corresponding areas of a photographic portrait. The cheek area could be differentiated from other areas of the face by a hue angle threshold without facial space information from the photographs or the paintings. The paper discusses problems in the direct application of the expression of skin color in a painting to a photograph and solutions to these problems, and an expression suitable for photographs is proposed.View full abstractDownload PDF (8160K)
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