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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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.

Nakano K.,Hazama | Matsushima S.,Kyoto University | Kawase H.,Kyoto University
Bulletin of the Seismological Society of America | Year: 2015

The objective of this study is to investigate in detail the characteristics of strong ground motions separated from acceleration Fourier spectra of ground motions observed by K-NET, KiK-net, and the Japan Meteorological Agency (JMA) Shindokei network in Japan using the generalized spectral inversion method. The separation method used here is the same as that proposed by Kawase and Matsuo (2004), with the same reference bedrock site at YMGH01. We include events with magnitude equal to or larger than 4.5 observed from 1996 to 2011. Our results are in good agreement with previous results regarding source, path, and site characteristics, but with higher stability thanks to the increased amount of data. We obtain site amplification factors common to all source types but with different Q-values for three source categories: crustal earthquakes (type C), subducting plate-boundary earthquakes (type B), and intraplate earthquakes (type I). We find that our frequency-dependent Q-values are comparable to those of previous studies, and that the obtained Q-values depend on the traveling regions. As for the geometric spreading factor n, we find that for type B and type I earthquakes, the value is close to 1.0 as expected, but type C earthquakes show apparent frequency dependence. From the corner frequencies of source spectra, we calculate Brune’s stress parameters and find a clear magnitude dependence, in which smaller events tend to spread over a wider range while maintaining the same maximum value. This means that stress drops for larger events would be maximal.We confirm that this is exactly the case for several mainshock–aftershock sequences. The average stress parameters are 5.1 and 6.0 MPa for types B and I, and 0.8 MPa for type C. This large difference between types B and I and type C can be explained primarily by the depth dependence of stress parameters. © 2015, Seismological Society of America. All rights reserved.

Utsuki S.,Hazama | Mito Y.,Kyoto University
ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014 | Year: 2014

Grouting is performed to mechanically improve the deformation and strength characteristics of bedrock by filling cracks with cement so that the entire bedrock is integrated and homogenized. For verifying the improvement, however, only permeability is currently considered because it is difficult to track other mechanical properties. For this reason, today dam foundation design cannot fully account for improvements, even though many construction activities are carried out to improve the mechanical properties of dam foundations. Against this background, we compared the results of borehole loading tests and indoor shear tests, before and after grouting. Based on the test results, the mechanical improvement of bedrock by grouting was characterized in order to develop a way to account for the mechanical improvement of bedrock in dam foundation design. © 2014 by Japanese Committee for Rock Mechanics.

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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