Tokyo, Japan
Tokyo, Japan

Hazama Corporation , or Hazama , is one of the 10 biggest construction companies in Japan. It has overseas networks in Asia, especially in the South Asian countries like Nepal, as well as in the USA, Mexico, Central and South America. Hazama was established in 1889. Wikipedia.

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Utsuki S.,Hazama | Nakaya M.,Hazama
50th US Rock Mechanics / Geomechanics Symposium 2016 | Year: 2016

In bedrock construction projects such as dams and tunnels, it is important to have a detailed grasp of the geological structure at the project site and to perform planning and construction appropriate to the situation. To that end, in recent years there have been investigations of various construction information modeling (CIM) management methods that realize 3D modeling of the presumed geological situation and the results of actual geographic observations. This paper describes the creation of a construction site support system for geological risk, in particular issues related to geological information CIM management system development, system content, and application to actual tunnel and dam excavation projects.

Tomioka S.,Hazama | Yoda T.,Waseda University
Structural Engineering International: Journal of the International Association for Bridge and Structural Engineering (IABSE) | Year: 2016

The Kintai-kyo Bridge is a unique, five-span wooden bridge with three arches across the Nishiki River, the largest river of the Yamaguchi Prefecture, Japan. The central wooden rib arch is very rare in the world. The bridge has become a famous landmark because of its elegant structure and its aesthetic appearance that is in harmony with the surrounding picturesque landscape. It is a popular historical site and attracts many tourists. The wooden bridge has been rebuilt several times since its inauguration in 1673. The latest rebuilding was done in 2004 which was almost 50 years after the previous one. The original span length of the Kintai-kyo Bridge was close to the limit allowed for construction of wooden bridges during that time. In order to strengthen the bridge against floods, the best combination of wood and stone was used. Arch structure was adopted for the superstructure, and hollow stone piers of spindle-shaped cross-section were adopted in the substructure. This paper studies the origin of the arch structure of the Kintai-kyo Bridge because this arch is unique and different from the voussoir arch or the corbel arch, and its resulting elegant appearance. In addition, as a unique feature, periodical inspections of the Kintai-kyo Bridge have been conducted by the Waseda University every 5 years since 1953, where the weight of local high-school students is used as the load for testing.

Ando A.,Tohoku University | Sugaya H.,Hazama | Hagiwara Y.,Tohoku University | Takahashi N.,Hazama | And 3 more authors.
International Orthopaedics | Year: 2013

Purpose: This study evaluated prognostic factors for the nonoperative treatment of stiff shoulder. Methods: Between June 2005 and May 2010, 497 stiff shoulders treated at our institute were included in this study. Multivariable analysis for recovery with Cox proportional hazard model was performed. The chief determining variable was pathogenesis (idiopathic, diabetic, post-traumatic) and confounding variables were age (49 or less, 50-59, 60 and above), sex, onset to visit interval (three months or less, four months or more), and external rotation (under 0, 0 or more) or forward flexion (less than 90, 90 or more) or internal rotation on the first visit. Results: There were 356 idiopathic, 61 diabetic, and 80 post-traumatic stiff shoulders. Hazard ratio (HR) and 95 % confidence interval (CI) for recovery (lower HR means poor prognosis) was 0.54 (0.36-0.96) in the diabetic group (p = 0.007), and 0.92 (0.67-1.25) in the post-traumatic group (p = 0.58) compared with the idiopathic group. A positive correlation was observed in ages of 60 or over (HR 1.46, 95 % CI 0.86-1.65, p-value 0.02) and external rotation under 0 on the first visit (0.71, 0.53-0.96, 0.03). No correlations were observed in sex (p = 0.78) or onset to visit interval (p = 0.99). Similar results were obtained when forward flexion or internal rotation was used as a confounding variable. Conclusions: Diabetes mellitus and severely restricted joint motion on the first visit were poor prognostic factors and ages of 60 or over was a better prognostic factor. © 2013 Springer-Verlag Berlin Heidelberg.

Sukegawa A.M.,Japan Atomic Energy Agency | Anayama Y.,NEO Tech | Okuno K.,Hazama | Sakurai S.,Japan Atomic Energy Agency | Kaminaga A.,Japan Atomic Energy Agency
Journal of Nuclear Materials | Year: 2011

A flexible heat resistant neutron shielding material has been developed, which consists of polymer resin with 1 wt% boron. The neutron shielding performance of the developed resin, examined by the 252Cf neutron source, is almost the same as that of the polyethylene. The outgas of H 2, H 2O, CO and CO 2 from the resin have been measured at ∼250 °C environment. The resin will be applied around the port of the vacuum vessel as an additional shielding material and reduce the neutron streaming from a superconducting tokamak device such as JT-60SA. © 2011 Elsevier B.V. All rights reserved.

Shimizu H.,Kyoto University | Koyama T.,Kyoto University | Ishida T.,Kyoto University | Chijimatsu M.,Hazama | And 2 more authors.
International Journal of Rock Mechanics and Mining Sciences | Year: 2010

In this study, the radial strain control method for uniaxial compression tests was introduced in the distinct element method (DEM) codes and the Class II behavior of rocks was simulated. The microscopic parameters used in the DEM models were determined based on laboratory uniaxial compression tests and Brazilian tests carried at Äspö Hard Rock Laboratory, Sweden. The numerical simulation results show good agreement with the complete stress-strain curves for Class II obtained from the laboratory experiments. These results suggest that the DEM can reproduce the Class II behavior of the rock successfully. The mechanism of the Class II behavior was also discussed in detail from the microscopic point of view. The loading condition and microscopic structure of rocks will play an important role for the Class II behavior. © 2009 Elsevier Ltd. All rights reserved.

Sukegawa A.M.,Japan Atomic Energy Agency | Okuno K.,Hazama
IEEE Transactions on Plasma Science | Year: 2015

In this study, a comparison between simulations using the Particle and Heavy Ion Transport code System (PHITS) code and activated material analysis of JT-60U have been performed. Neutron transport has been simulated using the Monte Carlo method PHITS to determine the neutron fluency at the irradiation position. The activated analysis has been complemented by the foil-activation technique. The preliminary accuracy assessment of these PHITS simulations has been confirmed by comparing the reaction rates of gold, cobalt, and nickel foil activation. The simulation results by PHITS consistent with the measured reaction rate of each foil near the device. © 1973-2012 IEEE.

Kirino M.,Hazama | Tomita I.,Tokyo Institute of Technology
Macromolecules | Year: 2010

As a novel thermal latent anionic initiator for lower temperature applications, a new class of aminimide, 1,1-dimethyl-1-(2-hydroxypropyl)amine benzoylformimide (BFI), was synthesized from benzoylformic acid methyl ester in 95% yield, and its thermal rearrangement behavior was studied in detail. Thermal rearrangement of BFI proved to take place on heating above 80 °C via the Curtius rearrangement mechanism, generating the corresponding isocyanate, hydroxyamine, and their further reaction products. BFI proved to catalyze the polymerization of epoxides and epoxide/thiol system on heating above 80 °C. They exhibit both the long pot life and the low-temperature rapid polymerization in the presence of BFI which supported the promising applications of BFI as an efficient thermal latent base catalyst for anionically polymerizable/curable systems. © 2010 American Chemical Society.

Ueda T.,Hokkaido University | Arai S.,Hazama
Advances in Concrete Structural Durability - Proceedings of the 2nd International Conference on Durability of Concrete Structures, ICDCS 2010 | Year: 2010

This paper presents the experimental method to obtain the deformational behavior of mortar in meso scalc under arbitrary moisture and temperature history, including freeze thaw cycles (FTC), and examples of the deformational behavior under FTC and constant ambient relative humidity. The experimental data indicated that the presented method is reliable. The remaining expansion or tensile strain, as evidence of frost damage, steadily increased with FTC and was approximately a half of the maximum expansion during freezing. The remaining expansion was not observed for the cases of moisture content less than 91%. Based on the experimental fact observed in this study, the concept of the meso-scalc deformational model for mortar is presented, which consists of expansive and contraction components. The way to predict structural performance of concrete members with frost damage is explained using the meso-scale deformational model. ©2010 by Hokkaido University Press All rights reserved.

Kirino M.,Hazama | Tomita I.,Tokyo Institute of Technology
Journal of Polymer Science, Part A: Polymer Chemistry | Year: 2012

An aminimide possessing a benzoyl substituent, 1,1-dimethyl-1-(2- hydroxypropyl)amine benzoylformimide (BFI), proved to serve as an excellent photobase catalyst. BFI decomposes smoothly by the UV irradiation to give products containing tertiary amines. The effective nature of BFI as a photo/thermal dual-base catalyst was convinced by the thermal and photoinduced polymerization of epoxide/thiol system. Based on the facts that the mixture of BFI and epoxide/thiol exhibit a long pot life in dark and that it undergoes smooth polymerization by UV irradiation and heating, it was supported that BFI serves as an efficient photo/thermal latent dual-base catalysts. It was also found that BFI initiates the free radical polymerization of vinyl monomers such as 2-hydroxylethyl methacrylate (HEMA) under the UV irradiation while the mixture of BFI and HEMA also exhibit a long pot life in dark, indicating the excellent ability of BFI as a photoradical initiator. © 2012 Wiley Periodicals, Inc.

Matsuki K.,Hazama | Sugaya H.,Hazama
Current Reviews in Musculoskeletal Medicine | Year: 2015

Arthroscopic labral repair is a widely performed and safe technique for anterior or posterior shoulder instability; however, complications have been reported in the literature. Postoperative injection of local anesthetic via an intra-articular pain pump should be avoided to prevent chondrolysis of the glenohumeral joint. Postoperative stiffness of the shoulder can be treated with physiotherapy, and a surgical treatment is indicated in shoulders that failed a conservative treatment. Although nerve injury is relatively rare, the axillary nerve should be given careful attention. Recurrent shoulder instability is the most common complication after labral repair, but most reported rates of recurrent instability after arthroscopic Bankart repair are less than 10 %. Augmentations, such as rotator interval closure and Hill-Sachs remplissage, have a potential to reduce the rate of recurrence. A better understanding of these possible complications, including their pathology and treatment, is essential for optimization of outcomes after arthroscopic labral repair. © 2014, Springer Science+Business Media New York.

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