JaLCDOI 10.18926/15466
フルテキストURL Mem_Fac_Eng_OU_24_1_1.pdf
著者 吉田 彰| 大上 祐司| 藤井 正浩|
抄録 To clarify the effects of a drive system lubricant additive upon rolling fatigue of rollers manufactured from carburized and hardened steel, three types of oil were used as lubricants: one mineral base oil and the other two mineral base oils to which an S-P additive package and ATF additive package were added, respectively. These specimens were tested for sliding/rolling fatigue and examined for failure on the surface, rolling fatigue strength, and other properties. Roller surface temperatures and inter-roller frictional coefficients were found scarcely affected by the type of oil used. Irrespective of the difference in oil type, failure on the surface was found to be entirely spalling attributable to cracks generated in the subsurface. The depth at which spalling cracks had taken place was found nearly coincident with the depth at which a ratio of reversing orthogonal shear stress to hardness had amplitude A(Tyz/Hv) maximized. These depths were larger as Hertz stress became more prominent. Nevertheless, they were found hardly affected by the type of oil. Although rolling fatigue strength did not show a significant difference dependent upon the type of oil, it may be said that fatigue life would be somewhat negatively affected by an extreme pressure coated film with a content of sulfur and phosphorus.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1989-11-29
開始ページ 1
終了ページ 12
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307588
JaLCDOI 10.18926/15261
タイトル(別表記) 現像温度および時間のマンモフイルム特性に与える影響
フルテキストURL 008_2_121_129.pdf
著者 丸山 敏則| 後藤 佐知子| 東 義晴| 中桐 義忠| 渋谷 光一| 杉田 勝彦| 竹内 知行| 本田 貢| 吉田 彰|
抄録 The influence for developing temperature and processing time within film processing conditions was investigated using four mammographic films, Konica New CM, Fuji UM-MA HC, Kodak Min-R M and Kodak EB/RA (for rapid system). And Fuji UR-2, a double-emulsion film, was used as a control. Those sensitometric strips exposed by a sensitometer were processed in the different combinations of developing temperatures ranging from 28 to 36℃, processing times from 45 to 210 sec. Average gradient, relative speed and base plus fog obtained from the measured film characteristic curves were evaluated for the different developing temperatures and times. Fuji UR-2 was scarcely affected and mammographic films were greatly affected in the different combinations without an increase in base plus fog except EB/RA. In New CM, UM-MA HC and Min-R M, the average gradients and the relative speeds increased as the developing temperature was higher and the developing time was longer, but the increases were limit on the combination of 36℃ and 210 sec in New CM and UM-MA HC. In EB/RA, the average gradients were almost constant and the relative speeds increased slightly like the double-emulsion film. These results suggested that it would be possible to contribute to dose reduction and advancement of contrast in New CM, UM-MA HC and Min-R M by changing these processing parameters.
抄録(別表記) フィルム処理条件において,現像温度と処理時間に対する影響を4種類のマンモグラフィ用フィルムKonica New CM, Fuji UM-MA HC,Kodak Min-R M,迅速処理用Kodak EB/RAについて調べた。そして,比較基準用として両面乳剤フィルムFuji UR-2を用いた。感光計で露光したフィルムを現像温度28~36℃,処理時間45~210秒で処理した。特性曲線から得られたフィルム特性(平均階調度,相対感度,カブリ濃度)を異なる現像温度,現像時間に対して評価した。UR-2はほとんど影響を受けず,マンモグラフィ用フィルムは,カブリ濃度が上昇することなく,現像条件の影響を大きく受けた。New CM, UM-MA HC,Min-R Mは現像温度の上昇,処理時間の延長に伴い,平均階調度と相対感度は増加した。しかし,New CM, UM-MA HCの36℃,210秒で増加は限度に達した。EB/RAの平均階調度は一定で,相対感度は両面乳剤フイルムと同 様にわずかな増加であった。これらの結果は,New CM, UM-MA HC, Min-R Mにおいて,処理条件を変化させることにより,被曝低減,コントラスト向上に貢献できる可能性を示唆していた。
キーワード マンモグラフィ (Mammography) 現像処理パラメータ (Processing Parameter) 特性曲線 (Characteristic Curve) 平均階調度 (Average Gradient) 相対感度 (Relative Speed)
出版物タイトル 岡山大学医療技術短期大学部紀要
発行日 1998-01-31
開始ページ 121
終了ページ 129
ISSN 0917-4494
言語 English
論文のバージョン publisher
NAID 120002307943
JaLCDOI 10.18926/14134
フルテキストURL Mem_Fac_Eng_39_1_1.pdf
著者 Vladimir I. Klochikhin| 藤井 正浩| 吉田 彰|
抄録 Improvement of wear resistance and durability of machine elements with sliding friction pairs is the important tribological problems. The wear resistance has been determined with many configurative parameters, technological parameters, and operational parameters. In this study kinematics of cylindrical joint (CJ), whose motion is reciprocating and rotating, and influence of various parameters on wear resistance of friction pair was investigated.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2005-01
開始ページ 1
終了ページ 6
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308183
著者 吉田 彰|
発行日 1999-08-31
出版物タイトル 岡山医学会雑誌
資料タイプ 学術雑誌論文
JaLCDOI 10.18926/11934
タイトル(別表記) Granularity of Asymmetric Screen-Film System
フルテキストURL 005_105_110.pdf
著者 本田 貢| 吉田 彰| 中村 伸枝| 三村 誠一| 門久 繁文| 三上 泰隆| 東 義晴| 竹内 知行| 杉田 勝彦| 平木 祥夫|
抄録 非対称増感紙フィルム系について、両面乳剤フィルムのウィナースペクトル測定に及ぼす影響を検討した。濃度0.5~2.5のノイズ試料のフロント乳剤、バック乳剤、支持体層それぞれで測定したスペクトルの和と、両面同時に測定した全スペクトルとを比較した。その結果、全ウィナースペクトルの値は、フロント乳剤、バック乳剤の和より高くなった。また、試料濃度が高いほど、その差は大きくなった。これらは、マイクロデンシトメータの光学系の配置と両面乳剤フィルムの構造に起因している。したがって、非対称システムのようにフィルムの前面と後面で特性を分けて考える場合、注意を要する。
抄録(別表記) We have examined a factor affecting the Wiener spectrum measurement of double-emulsion film. An asymmetric screen-film system (Kodak HC/INSIGHT system) was used in this study. The results indicated that the total Wiener spectra of double-emulsion films are higher than the sum of spectra obtained with the front emulsion and back emulsion separately. These differences are attributed to the arrangement of the optical system of the microdensitometer used to measure and the structure of double-emulsion film.
キーワード 非対称増感紙フィルム系 (asymmetric screen-film system) 両面乳剤フィルム (double-emulsion film) ウィナースペクトル (Wiener spectrum) 粒状性 (granularity) マイクロデンシトメータ (microdensitometer)
出版物タイトル 岡山大学医療技術短期大学部紀要
発行日 1995-01-31
開始ページ 105
終了ページ 110
ISSN 0917-4494
言語 Japanese
論文のバージョン publisher
NAID 120002313805
JaLCDOI 10.18926/11849
タイトル(別表記) Physical Image Quality of Rapid Processing Films
フルテキストURL 003_099_104.pdf
著者 吉田 彰| 本田 貢| 中村 伸枝| 有岡 匡| 小橋 利美| 竹内 知行| 三上 泰隆| 杉田 勝彦| 平木 祥夫|
抄録 The imaging properties of Konica "new" SR series films and "old" MG-SR series films for rapid processing were measured in combination with green-emitting intensifying screens. The measured image quality prarameters include: characteristic curve, modulation transfer function (MTF) and Wiener spectrum. The relative speeds of the new SR series systems were slower than those of the old MG-SR series systems from 10 to 25%. The MTF's of the new systems were generally comparable to those of the old systems, except that SR-G system was improved with an increase of approximately 10%. In the Wiener spectrum measurement, however, the new systems showed from 10 to 35% decrease in low-frequency noise.
キーワード Rapid Processing Films Image Quality Characteristic Curve MTF Wiener Spectrum
出版物タイトル 岡山大学医療技術短期大学部紀要
発行日 1993-01-31
開始ページ 99
終了ページ 104
ISSN 0917-4494
言語 Japanese
論文のバージョン publisher
NAID 120002314046
JaLCDOI 10.18926/11808
フルテキストURL 002_081_088.pdf
著者 竹内 知行| 吉田 彰| 東 義晴| 杉田 勝彦| 中村 伸枝| 岸 幹二| 平木 祥夫|
抄録 We have developed a new technique for measuring the modulation transfer function (MTF) of a cathode ray tube (CRT) monitor. The "nominal" MTF was measured by displaying a line image of a width of one pixel on the CRT monitor using the pattern generator. We also measured the effective pixel width. In order to obtain the "actual" MTF, the nominal MTF was divided by the sinc function which is the Fourier transform of the effective pixel width. The results indicate that the corrected MTF converges to the constant value as the effective pixel width is narrower. Thus, the actual MTFs were determined and compared in the horizontal direction for two CRT monitors.
キーワード CRT Monitor Resolution Effective Pixel Width Modulation Transfer Function (MTF)
出版物タイトル 岡山大学医療技術短期大学部紀要
発行日 1992-02-05
開始ページ 81
終了ページ 88
ISSN 0917-4494
言語 Japanese
論文のバージョン publisher
NAID 120002313719
JaLCDOI 10.18926/11755
タイトル(別表記) New Stepwedge for Bootstrap Sensitometry in Medical Radiography
フルテキストURL 001_019_027.pdf
著者 吉田 彰| 小橋 利美| 大川 義弘| 三上 泰隆| 平木 祥夫| 東 義晴| 山田 俊治| 杉田 勝彦|
抄録 A new stepwedge has been developed for bootstrap sensitometry, which is used for determining the characteristic curve of radiographic screen/film systems. Since each step of the stepwedge is separated by the lead septum, flare generated under one step will not penetrate the region of another step. The metal of the stepwedge can be changed with various materials. Characteristic curves obtained with new stepwedge bootstrap (NSB) and conventional stepwedge bootstrap (CSB) techniques were compared with those obtained for screen/film systems with inverse sqare sensitometry. The inverse square method was used as the reference standard for accuracy. The NSB method provided characteristic curves that agreed well with those obtained using the inverse square method. The slope of the curve in the CSB method was lower than that in the inverse square or NBS method, because of scatter radiation. The shape of the characteristic curve from the NSB method did not vary with the materials of step metals (aluminum and copper). The cumulative error involved when using the bootstrap method is also discussed.
キーワード Stepwedge Bootstrap Characteristic curves Sensitometry Radiographic screen/film systems
出版物タイトル 岡山大学医療技術短期大学部紀要
発行日 1991-03-25
開始ページ 19
終了ページ 27
ISSN 0917-4494
言語 Japanese
論文のバージョン publisher
NAID 120002313394
JaLCDOI 10.18926/11733
タイトル(別表記) Physical Properties of Screen-Film Systems - New System for Chest Radiography -
フルテキストURL 006_007_013.pdf
著者 後藤 佐知子| 吉田 彰| 中村 伸枝| 丸山 敏則| 東 義晴| 渋谷 光一| 中桐 義忠| 杉田 勝彦| 本田 貢|
抄録 胸部専用の新しい増感紙/フィルムシステムについて物理的画質特性を測定し、従来のシステムと比較を行った。測定した新システムは、日本コダックのインサイトシステムからHC/IT-1、富士メディカルシステムのADシステムからHG-M/UR-1、コニカのEXシステムからXG-S/ES-C である。従来のシステムとして富士メディカルシステムのHR-4/Super HR-S を使用した。その結果、新システムは22~73%感度は高く、特性曲線においては低濃度部を持ち上げ、最大コントラストは高濃度側にシフトしていた。空間周波数2cycles/mmで相対鮮鋭度を比較すると、新システムが10~30%程度の低下となっていた。ノイズは、濃度1.0で新システムが35~46%の減少となった。以上より、新システムは、縦隔部の濃度を上げ、粒状性の改善を重視した設計となっていることが分かった。
抄録(別表記) The new three screen-film systems, Kodack INSIGHT system HC/IT-1, Fuji AD system HG-M/UR-1, and Konica EX system XG-S/ES-C for chest radiography were evaluated. In addition, the conventional system Fuji HR-4/Super HR-S was measured for comparison with new systems. The evaluation method is as follows. The image quality characteristics, speed, contrast, resolution and granularity were measured. The sensitivity and contrast were determined by measuring the MTF (modulation transfer function) and NCTF (normalized contrast transfer function). The granularity was estimated by measuring the Wiener spectrum. The speed of the new systems were improved by 22% to 73%. The dinsities at the maximum gradient value were shifted to high density (2.0-2.7). However, they had 10% to 30% less resolution. The other hand, the granularities were improved by 21% to 37% at 1.0 density. These results suggested that the emphasis of new systems was put on improving the image quality of mediastinum region, maintaining performance of the conventional system.
キーワード 増感紙フィルム系 (screen-film system) 物理特性 (physical properties) 感度 (speed (film sensitivity)) コントラスト (contrast) 鮮鋭度 (resolution) 粒状性 (granularity)
出版物タイトル 岡山大学医療技術短期大学部紀要
発行日 1996-02-29
開始ページ 7
終了ページ 13
ISSN 0917-4494
言語 Japanese
論文のバージョン publisher
NAID 120002313511
JaLCDOI 10.18926/11719
タイトル(別表記) Influence on the character of films used for density control of an automatic processor by the difference in the way of preserving
フルテキストURL 010_1_023_028.pdf
著者 大野 誠一郎| 吉田 彰| 井上 龍也| 小橋 利美| 森岡 泰樹| 中桐 義忠|
抄録 自動現像機の濃度管理に用いられるフィルムの保存については,種々の報告がなされており,最良の方法が確立されているとは言い難い。さらに,レギュラフィルムとオルソフィルムの保存方法の違いによる濃度管理への影響,あるいはこれらの比較については,これまでほとんど報告されていない。本論文では,われわれは,レギュラフィルム,フジnew-RXとオルソフィルム,コニカSR-G,SR-VおよびSR-Hを用い,開封後,室温,冷蔵,冷凍の3種類の保存方法を採用した。われわれは,35週間3種類の保存方法で4種類 のフィルムのgross fog,speed indexとaverage gradientへの影響を調査した。その結果レギュラフィルムは,3種類の保存方法による差が認められなかった。オルソフィルムでは,冷蔵・冷凍保存に大きな特性変動が認められた。その原因として,オルソフィルムは増感色素が結露に対して敏感に影響を受けたと考えられた。
抄録(別表記) Though there are various reports on the way of preserving films used for density control of the automatic processor, it is hard to say that the best method isestablished. In addition, the influences on density control or their comparisons by the difference way of preserving film between regular and orthochromatic films have been hardly reported until now. In this paper, three ways of preserving films were employed, which were at a room temperature, in a refrigeration and in a freezer after the films were opened, using a regular film, Fuji new-RX and three orthochromatic films, Konica SR-G, SR-V and SR-H. We investigated the influences on gross fog, speed index and average gradient of four films on three different ways of preserving film for 35 weeks. As a result, new-RX film wasn't influenced by the ways of the preservation. On the other hand, the orthochromatic films were so influences sensitively that the films couldn't be used for density control. It was considered that sensitizing dye stuff got denatured by dew condensation.
キーワード 自動現像機 (automatic processor) 濃度管理 (density control) フィルム保存 (film preservation) 結露 (dew condensation)
出版物タイトル 岡山大学医学部保健学科紀要
発行日 1999-12-20
開始ページ 23
終了ページ 28
ISSN 1345-0948
言語 Japanese
論文のバージョン publisher
NAID 120002313437