Godo Shigen Sangyo Co.

Chūō-ku, Japan

Godo Shigen Sangyo Co.

Chūō-ku, Japan
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Nakagawa T.,Kanto Natural Gas Development Co. | Suzuki I.,INPEX Corporation | Manabu N.,Godo Shigen Sangyo Co. | Ogatsu T.,Kanto Natural Gas Development Co. | Higuchi T.,Kanto Natural Gas Development Co.
IAHS-AISH Publication | Year: 2010

For four years from 1996 to 1999, the former Japan National Oil Corporation and eight companies developed the JARAS/3D simulator. This simulator is characterized by its ability to express two types of gas production performance in the Southern Kanto Natural Gas Field, and evaluate amounts of land subsidence associated with gas production. This simulator has already been used in several studies by the Environment Committee. This paper introduces this simulator. Copyright © 2010 IAHS Press.


Molla M.Z.,Kyushu Institute of Technology | Mizukoshi N.,Godo Shigen Sangyo Co. | Furukawa H.,Kyushu Institute of Technology | Ogomi Y.,Kyushu Institute of Technology | And 3 more authors.
Progress in Photovoltaics: Research and Applications | Year: 2015

Transparent conductive oxide-less (TCO-less) dye-sensitized solar cells (DSSCs) have been fabricated and characterized using nanoporous TiO2-coated stainless steel metal mesh as flexible photoanode and cobalt bipyridyl complex (Co(bpy))-based one electron redox shuttle electrolyte. Attempts have been made towards enhancing the efficiency of TCO-less DSSCs to match with their TCO-based DSSC counterparts. It has been found that surface protection of metal mesh is highly required for enhancing the efficiency of TCO-less DSSCs specially using cobalt electrolytes as confirmed by dark current-voltage characteristics. Photocurrent action spectra clearly reveal that TCO-based DSSCs using (Co(bpy)) electrolyte exhibits photon harvesting (incident photon to current conversion efficiency (IPCE) 52%) in the 370-450 nm wavelength region as compared to photon harvesting at peak absorption of the dye (IPCE 56% at 550 nm), which is almost the same (IPCE 47%) in the 400-610 nm wavelength region for TCO-less DSSCs. Under similar experimental conditions, replacing indoline dye D-205 to porphyrin-based dye YD2-o-C8 led to the enhancement in the photoconversion efficiency from 3.33% to 4.84% under simulated solar irradiation. Copyright © 2014 John Wiley & Sons, Ltd.


Sugai Y.,Kyushu University | Sasaki K.,Kyushu University | Wakizono R.,Kyushu University | Higuchi Y.,Godo Shigen Sangyo Co. | Muraoka N.,Godo Shigen Sangyo Co.
International Biodeterioration and Biodegradation | Year: 2013

Brine produced from water-dissolved natural gas reservoirs should be returned to the reservoirs after the resources are recovered to prevent land subsidence. However, the ability to re-inject the brine gradually decreases and is only rectified by carrying out backwashing treatment of re-injection wells. Because the brine contains high levels of iodine also, it is also recovered from the brine using sulfuric acid and oxidizing agents. These chemicals may stimulate the growth of microorganisms that may cause the clogging. In this study, we used column experiments to investigate the possibility of the microbial clogging.Significant clogging was observed on the columns that were treated by the brine containing both indigenous microorganisms and dissolved oxygen. In particular, iodide-oxidizing bacteria were detected from the columns and original brine dominantly; therefore, it was assumed to have an important influence on the clogging. Iodine that was produced by iodide-oxidizing bacteria corroded iron in the sand under the presence of dissolved oxygen. Eluted Iron formed ferric hydroxide colloid in the brine and it caused the clogging of the pore spaces.We also demonstrated that deoxidized brine inhibited the iodide-oxidizing bacteria from becoming dominant and the column from the clogging through the column experiments. From these results, we can suggest removing dissolved oxygen as the most feasible countermeasures for the clogging. © 2012 Elsevier Ltd.


Kitakaze A.,Yamaguchi University | Itoh H.,Yamaguchi University | Komatsu R.,Yamaguchi University | Higuchi Y.,Godo Shigen Sangyo Co.
Canadian Mineralogist | Year: 2012

Baumstarkite, ideally AgSbS2, was found as aggregates of euhedral crystals in the Koryu mine, Hokkaido, Japan. The optical properties, chemical composition, and cell parameters of this mineral are presented. The compositional ranges are from 1.8 to 7.0 at.% As (7.4 to 28.2 mol.% AgAsS 2). The unit cell of a sample with 10 mol.% AgAsS 2 is triclinic, P1̄ with a 7.778(1), b 8.326(1), c 8.814(1) Å, α 100.90(1), β 104.01(1), γ 90.06(1)°, and V 543.2(1) Å3; these values are in very good accordance with those of the type mineral as well as those of synthetic material.


Lei L.,Kyoto University | Tanishima M.,Kyoto University | Goto A.,Kyoto University | Kaji H.,Kyoto University | And 4 more authors.
Macromolecules | Year: 2014

Several low-molar-mass alkyl iodides were studied as initiating dormant species in living radical polymerization with organic catalysts. Primary, secondary, and tertiary alkyl iodides with different stabilizing groups (ester, phenyl, and cyano groups) were systematically studied for the rational design of initiating alkyl iodides. The activation rate constants of these alkyl iodides were experimentally determined for quantitative comparison. These alkyl iodides were used in the polymerizations of methyl methacrylate and butyl acrylate to examine their initiation ability in these polymerizations. A telechelic polymer was prepared using an alkyl iodide with a functional group. Alkyl iodides with multi-initiating sites were also studied. © 2014 American Chemical Society.


Tanishima M.,Kyoto University | Goto A.,Kyoto University | Lei L.,Kyoto University | Ohtsuki A.,Kyoto University | And 8 more authors.
Polymers | Year: 2014

Well-defined diblock and triblock copolymers, star polymers, and concentrated polymer brushes on solid surfaces were prepared using living radical polymerization with organic catalysts. Polymerizations of methyl methacrylate, butyl acrylate, and selected functional methacrylates were performed with a monofunctional initiator, a difunctional initiator, a trifunctional initiator, and a surface-immobilized initiator. © 2014 by the authors.


Shibayama A.,Akita University | Takasaki Y.,Akita University | William T.,Akita University | Yamatodani A.,Godo Shigen Sangyo Co. | And 3 more authors.
Journal of Hazardous Materials | Year: 2010

During pyro-metallurgical processing of non-ferrous metals, smelting residues such as smelter slag, flue gas, containing value metals and also harmful substances are inevitably generated as secondary product. For reduction of environmental loading and recovery of the value metals, such materials demand proper treatment options.In this research, some experimental steps were investigated to remove high arsenic (As: 19.5wt%) and recover copper (Cu: 3.1wt%) contained in such smelting residues. In the first-stage arsenic and other volatile materials were removed by pyro-metallurgical treatment and in the second-stage the treated residue from pyro-processing was treated in hydrometallurgical processing involving a two-stage leaching operation in H2SO4 solution to dissolve the metals followed by solvent extraction using LIX-84I as extractant to recover dissolved Cu in final leached solution.The results showed that over 90% of arsenic in smelting residue was removed by volatilization and recovered as As2O3 while copper content increased to 4.2wt%. In the two-stage leaching process, first up to 90% of arsenic was selectively dissolved in 0.25mol/L H2SO4 solution and second, the solids were further leached in 1.0mol/L H2SO4 solution giving 85% of copper dissolution. Over 90% of copper dissolved into solution was recovered by solvent extraction. Finally over 99% of arsenic dissolved in the first-stage leach solution was co-precipitated with iron dissolved in second-stage leach solution after copper recovery. © 2010 Elsevier B.V.


Wakizono R.,Kyushu University | Sugai Y.,Kyushu University | Sasaki K.,Kyushu University | Higuchi Y.,Godo Shigen Sangyo Co. | Muraoka N.,Godo Shigen Sangyo Co.
Society of Petroleum Engineers - SPE Asia Pacific Oil and Gas Conference and Exhibition 2011 | Year: 2011

The brine that has been produced from water-dissolved natural gas reservoirs should be returned into reservoirs after the resources have been extracted to prevent the subsidence. However, the re-injectivity of the brine declines gradually; therefore, re-injection wells should be maintained by backwashing treatments. Colloidal materials like biofilms can be observed in solid materials that have been produced by the backwashing from the re-injection wells. Because the brine contains not only dissolved natural gas but also high levels of iodine, the iodine is also extracted from the brine chemically using sulfuric acid and oxidizing agent; therefore, re-injected brine contains sulfate and dissolved oxygen abundantly. These chemicals may stimulate the metabolites of microorganisms that have influences on the clogging; therefore, we considered the influences of these materials on microorganisms that may cause the clogging in this study. Column experiments were carried out using sand and brine that were collected in the gas field. The columns that the brine including indigenous microorganisms, dissolved oxygen and sulfate was injected into were clogged significantly. Iodide-oxidizing bacteria, iron-oxidizing bacteria and sulfate-reducing bacteria were found specifically in clogged columns, suggesting these microorganisms had influences on the clogging. In particular, Iodide-oxidizing bacteria were also found in original brine; therefore, it was assumed to have an important influence on the clogging. Iodide-oxidizing bacteria convert iodide into iodine that corrodes iron in the sand under the presence of dissolved oxygen. Iron (II) ion that has been eluted from the sand is oxidized to iron (III) ion by iron-oxidizing bacteria under the presence of dissolved oxygen. Iron (III) ion forms ferric hydroxide colloid in the brine and it causes the clogging of the porous media. From these mechanisms of the clogging, we can suggest removing dissolved oxygen as the most feasible countermeasures for the clogging. Copyright 2011, Society of Petroleum Engineers.

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