Search Results 1-20 of 727

  • Modelling of Hydrogen Diffusion in a Weld Cold Cracking Test: Part 2, Numerical Calculations

    Kasuya Tadashi , Yokobori A. Toshimitsu , Ozeki Go , Ohmi Toshihito , Enoki Manabu

    … We firstly conducted a y groove weld cracking test using 980 MPa grade steel and 780 MPa grade welding consumable to observe HAZ cracking. …

    ISIJ International, 2021

    J-STAGE 

  • Modelling of Hydrogen Diffusion in a Weld Cold Cracking Test: Part 1, Experimental Determinations of Apparent Diffusion Coefficient and Boundary Condition

    Kasuya Tadashi , Yokobori A. Toshimitsu , Ozeki Go , Ohmi Toshihito , Enoki Manabu

    … <p>Weld cold cracking is a kind of hydrogen embrittlement and is a serious problem when high strength steel is concerned. … Cold cracking usually occurs at the area where hydrogen locally accumulates, and hence hydrogen diffusion modelling is important to understand the hydrogen distribution in a welded joint. …

    ISIJ International, 2021

    J-STAGE 

  • Development of an appropriate simple suspension method for valganciclovir medication

    Masaoka Yasuyuki , Kawasaki Yoichi , Kikuoka Ryo , Ogawa Atsushi , Esumi Satoru , Wada Yudai , Ushio Soichiro , Kitamura Yoshihisa , Sendo Toshiaki

    … The VGC concentrations of suspensions produced using different preparation methods were also determined using HPLC.</br>Results</br>Cracking the surfaces of VGC tablets and suspending them in water at an initial temperature of 55 °C was effective at dissolving the tablets. … The VGC concentration of the suspension remained stable for at least 80 min. Furthermore, the VGC concentration remained stable for 48 h during cold dark storage. …

    Journal of Pharmaceutical Health Care and Sciences 6(1), 16, 2020-07-07

    IR 

  • The Effect of Cold Cracking Prevention of FCAW by the Welding Process for Reducing Diffusible Hydrogen  [in Japanese]

    迎井 直樹 , 井上 芳英 , 田代 真一 , 菅 哲男 , 田中 学

    スマートプロセス学会誌 = Journal of smart processing 9(1), 33-37, 2020-01

  • Studies on Long-term Stress Corrosion Cracking Resistance for TT Alloy 690  [in Japanese]

    Yonezawa Toshio

    Materia Japan 59(12), 654-661, 2020

    J-STAGE 

  • Study of Shieldability of the Low Hydrogen Welding Process by Numerical Simulation  [in Japanese]

    MUKAI Naoki , TASHIRO Shinichi , MURPHY Anthony B. , INOUE Yoshihide , SUGA Tetsuo , TANAKA Manabu

    … Cold cracking sensibility is severe problem in the welding fabrication of large-scale steel structures. …

    Journal of Smart Processing 9(4), 199-207, 2020

    J-STAGE 

  • A STUDY ON WELDABILITY OF HIGH STRENGTH REINFORCING BARS (PART 1): EVALUATION BY WELD CRACKING  [in Japanese]

    YABE Yoshitaka , NARIHARA Hiroyuki , NAKAGOMI Tadao

    … weldability of reinforcing bars, it is considered that the weld cracks in welds do not occur and the heat-affected zone fractures which lead to decline the joint performance do not occur.</p><p> In this study (part1), at first, focusing on weld cracking, we investigated experimentally the effect of changes of indices such as the carbon content, the carbon equivalent, and the weld cracking susceptibility composition of high strength reinforcing bars on occurrence of weld cracking at …

    Journal of Structural and Construction Engineering (Transactions of AIJ) 85(770), 455-461, 2020

    J-STAGE 

  • Prevention of Cold Cracking by the Welding Process for Reducing Diffusible Hydrogen in High-Tensile Thick Plate Welding  [in Japanese]

    MUKAI Naoki , INOUE Yoshihide , SASAKURA Shuji , KINOSHITA Yuta

    … Cold cracking sensibility is severe problem in the welding fabrication of large-scale steel structures. … It is well-known that diffusible hydrogen content in the weld metal strongly influences this cracking. … In this study, the effect of cold cracking prevention and required preheating temperature reduction by new welding process were confirmed. … The window type restraint weld cracking test was applied. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(1), 41-51, 2020

    J-STAGE 

  • Evaluation of Mechanical and Shrinkage Behavior of Cold-weather Cementitious Mortars Mixed with Nitrite-Nitrate Based Accelerator

    TOMITA Yusuke , YONEYAMA Akira , CHOI Heesup , INOUE Masumi , KIM Jihoon , CHOI Hyeonggil , SUDOH Yuhji

    … Recently, calcium nitrite (Ca(NO2)2) and calcium nitrate (Ca(NO3)2) have been increasingly used as the main components of salt- and alkali-free anti-freezing agents, for promoting concrete hydration in cold-weather concreting. … The result confirmed that, as the amount of nitrite-based accelerator was increased, the shrinkage was increased, and cracking in early age was more likely to occur, compared to the cases without the addition of this accelerator. …

    MATERIALS 13(17), 2020

    IR 

  • Effect of Adjacent Weld-Bead on Cold Cracking and Fatigue Strength  [in Japanese]

    米澤 隆行 , 大川 鉄平 , 橋場 裕治 , 堤 駿 , 内野 一成

    日本船舶海洋工学会講演会論文集 Conference proceedings, the Japan Society of Naval Architects and Ocean Engineers (29), 355-357, 2019-11

  • Pluto's ocean is capped and insulated by gas hydrates

    Kamata Shunichi , Nimmo Francis , Sekine Yasuhito , Kuramoto Kiyoshi , Noguchi Naoki , Kimura Jun , Tani Atsushi

    … On the other hand, to maintain large variations in ice shell thickness, Pluto's ice shell needs to be cold. … Clathrate hydrates act as a thermal insulator, preventing the ocean from complete freezing while keeping the ice shell cold and immobile. … The most likely clathrate guest gas is methane either contained in precursor bodies and/or produced by cracking of organic materials in the hot rocky core. …

    Nature Geoscience 12(6), 407-410, 2019-05-20

    IR 

  • Demonstration of Year-Round Production of Tomato Fruits with High Soluble-Solids Content by Low Node-Order Pinching and High-Density Planting  [in Japanese]

    岩崎 泰永 , 山根 陽弘 , 伊藤 瑞穂 , 後藤 千彩音 , 松本 浩一 , 高市 益行

    寒冷地である宮城県の太平洋沿岸地域において，低段密植栽培を利用して高糖度トマト生産の栽培実証を行った．本実験では，実際の生産に近い1730m2 のハウスを利用し，栽培管理責任者と作業者を配置して，生産および販売を行いトマトの収量や経費，販売に関するデータを収集した．その結果，1 年間の可販果収量は15.3kg ／ m2 で，糖度6 未満は19％（3.0 kg ／ m2），糖度6 以上7 未満は36 …

    農研機構研究報告　野菜花き研究部門 = BULLETIN OF THE NARO, CROP SCIENCE (3), 41-51, 2019-03-31

    IR  DOI 

  • FIELD INVESTIGATION FOR REHABILITATION OF SEVERELY DETERIORATED CRCP ON BAN-ETSU EXPRESSWAY IN JAPAN  [in Japanese]

    小池 海 , 佐藤 勉 , 大脇 真也 , 佐藤 定夫 , 西澤 辰男

    土木学会論文集. E1, 舗装工学 = J.JSCE. 土木学会舗装工学委員会 編 75(2), 123-131, 2019

  • Stress Corrosion Cracking Resistance and Microstructure of Cu-Zn Alloys  [in Japanese]

    松野下 裕貴 , 久保田 賢治 , 伊藤 優樹 , 森 広行 , 森川 健二 , 牧 一誠

    銅と銅合金 : 銅及び銅合金技術研究会誌 = Copper and copper alloy : journal of Japan Research Institute for Advanced Copper-Base Materials and Technologies 58(1), 309-314, 2019

  • SCC Potential Assessment in Butt Welded Zone of Medium-Diameter Pipe  [in Japanese]

    NAKANO Yosuke , TOYOSHIMA Yoshiteru , ISHII Yuya , MIYATA Yuka , YANAGIDA Nobuyoshi

    … <p>The purpose of this study is to evaluate the risk of Stress Corrosion Cracking (SCC) initiation to medium-diameter 200A and 250A low-carbon stainless steel piping. … The hardness got softened in heat affected zone and get hardened in the hardened layer which made by cold work. …

    The Proceedings of the Materials and Mechanics Conference 2019(0), OS1304, 2019

    J-STAGE 

  • FIELD INVESTIGATION FOR REHABILITATION OF SEVERELY DETERIORATED CRCP ON BAN-ETSU EXPRESSWAY IN JAPAN  [in Japanese]

    KOIKE Kai , SATO Tsutomu , OWAKI Shinya , SATO Sadao , NISHIZAWA Tatsuo

    <p>　磐越道で建設されたCRCPは，1990年10月の供用から継続的にひび割れ幅が広がり，横ひび割れ間隔は狭くなった．1996年からはコンクリート版表面が破砕するパンチアウトが発生した．損傷要因はセットフォーム工法による打継目及び塩害とされ，当該損傷箇所は2000年から超速硬コンクリートによる部分打換工とアスファルトオーバーレイ工による対策工を実施した．このことから損傷経緯及び得られ …

    Journal of Japan Society of Civil Engineers, Ser. E1 (Pavement Engineering) 75(2), I_123-I_131, 2019

    J-STAGE 

  • The Effect of Cold Cracking Prevention of FCAW by the Welding Process for Reducing Diffusible Hydrogen  [in Japanese]

    MUKAI Naoki , INOUE Yoshihide , TASHIRO Shinichi , SUGA Tetsuo , TANAKA Manabu

    … Cold cracking sensibility is severe problem in the welding fabrication of large-scale steel structures. … It is well-known that diffusiblehydrogen content in the weld metal strongly influences this cracking. … In this study,the effect of cold cracking prevention in FCAW by new low hydrogen process was confirmed. … The y-groove weld cracking test wasapplied. …

    Journal of Smart Processing 9(1), 33-37, 2019

    J-STAGE 

  • Cold Cracking Inhibition Effect by Welding Process for Reducing Diffusible Hydrogen 2nd report  [in Japanese]

    MUKAI Naoki , INOUE Yoshihide , KINOSHITA Yuta

    本研究は，ワイヤ周囲ガスを吸引しながら溶接を行うことで拡散性水素量を低減するプロセスによる低温割れ抑制効果に関する．第1報で780MPa級鋼85mmtの予熱パス間温度50℃での施工を対象として，従来法との比較により低温割れ抑制効果を示した．本報はより低温の追加試験に関する．25℃では割れは発生せず，0℃の試験では低温割れが発生した．本施工法により50℃程度の予熱低減効果があることが確認できた．

    Preprints of the National Meeting of JWS 2019f(0), 358-359, 2019

    J-STAGE 

  • P-27　Biodiesel production from animal fats using fixed bed reactor filled with nickel catalyst  [in Japanese]

    SHINOHARA Genta , ITO Takuya

    … However, the biodiesel of animal fats origin is not used in winter and cold regions because it contains a lot of saturated fatty acids with a high solidifying point. … Hence, the authors paid attention to the catalytic cracking method its biodiesel production. … The catalytic cracking method includes the generation of paraffin and olefin with a lower solidifying point than the fatty acid methyl ester. …

    Proceedings of the Conference on Biomass Science 15(0), 95-96, 2019

    J-STAGE 

  • Cold Cracking Inhibition Effect by Welding Process for Reducing Diffusible Hydrogen  [in Japanese]

    MUKAI Naoki , INOUE Yoshihide , SASAKURA Shuji , KINOSHITA Yuta

    ワイヤ周囲ガスを吸引しながら溶接を行うことで拡散性水素量を低減するプロセスが開発されている．しかしその低温割れ抑制効果はこれまで示されていない．780MPa 級鋼のGMAW 施工を対象に割れ抑制効果の検証を行った．板厚85mmt，予熱温度50℃における窓形拘束溶接割れ試験において，従来施工法では発生が見られた割れが、本プロセスでは見られず，低温割れの抑制に有効なプロセスであることが確認された．

    Preprints of the National Meeting of JWS 2019s(0), 94-95, 2019

    J-STAGE 

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