GPI Journal
Online ISSN : 2433-4510
Print ISSN : 2189-3373
Current issue
Displaying 1-21 of 21 articles from this issue
  • 2024Volume 10Issue 1 Pages 1-6
    Published: December 31, 2024
    Released on J-STAGE: September 10, 2025
    JOURNAL OPEN ACCESS
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  • 2024Volume 10Issue 1 Pages 7-10
    Published: December 31, 2024
    Released on J-STAGE: September 10, 2025
    JOURNAL OPEN ACCESS
    The constituent material of the FRP tube consists of a composite material with a tensile strength of up to 70 MPa allowable elongation of 12% and an interfacial shear strength of about 7 MPa with reinforced glass fiber, and a tensile strength of about 50% Vol orthogonal lamination compared to circumferential and axial glass fiber 2:1 and a tensile strength of about 4500/2250 MPa with a permissible elongation of 2%. Here, we will explain the GPI standard for the lamination design that is 80% effective of unidirectional reinforcing fiber, the primer design of the binding matrix, and the basic design standard of the corrosion-resistant tube that obtains a pipe application limit of 100 MPa.
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  • 2024Volume 10Issue 1 Pages 11-16
    Published: December 31, 2024
    Released on J-STAGE: September 10, 2025
    JOURNAL OPEN ACCESS
    The constituent material of the FRP tube consists of a composite material with a tensile strength of up to 70 MPa allowable elongation of 12% and an interfacial shear strength of about 7 MPa with reinforced glass fiber, and a tensile strength of about 50% Vol orthogonal lamination compared to circumferential and axial glass fiber 2:1 and a tensile strength of about 4500/2250 MPa with a permissible elongation of 2%. Here, we will explain the GPI standard for the lamination design that is 80% effective of unidirectional reinforcing fiber, the primer design of the binding matrix, and the basic design standard of the corrosion-resistant tube that obtains a pipe application limit of 100 MPa.
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  • 2024Volume 10Issue 1 Pages 17-20
    Published: December 31, 2024
    Released on J-STAGE: September 10, 2025
    JOURNAL OPEN ACCESS
    GPI standard products are in the form of products with couplings and pin caps. The applicable quality evaluation is based on API, ISO, ASTM, and AWWA standards, and all shipped products are passed or rejected by non-destructive load tests. Two types of test equipment are required: a quality performance confirmation test for multiple combined loads leading to failure, and a non-destructive test facility. The non-destructive test before shipment is based on a visual pass/fail judgment that is held for 2 minutes at 1.5 times the working load and no damage has occurred. Unlike the destructive test jig, the jig used for the test withstands hydraulic load with a rubber ring packing on the inner surface of a simple tube, and breakage or leakage is determined by a pressure meter for 2 minutes. The following is an explanation of the GPI standard test apparatus and test evaluation method.
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  • 2024Volume 10Issue 1 Pages 21-25
    Published: December 31, 2024
    Released on J-STAGE: September 10, 2025
    JOURNAL OPEN ACCESS
    GPI standard products are in the form of products with couplings and pin caps. The applicable quality evaluation is based on API, ISO, ASTM, and AWWA standards, and all shipped products are passed or rejected by non-destructive load tests. Two types of test equipment are required: a quality performance confirmation test for multiple combined loads leading to failure, and a non-destructive test facility. The non-destructive test before shipment is based on a visual pass/fail judgment that is held for 2 minutes at 1.5 times the working load and no damage has occurred. Unlike the destructive test jig, the jig used for the test withstands hydraulic load with a rubber ring packing on the inner surface of a simple tube, and breakage or leakage is determined by a pressure meter for 2 minutes. The following is an explanation of the GPI standard test apparatus and test evaluation method.
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  • 2024Volume 10Issue 1 Pages 26-30
    Published: December 31, 2024
    Released on J-STAGE: September 10, 2025
    JOURNAL OPEN ACCESS
    Aircraft that use fossil fuels emit large amounts of carbon dioxide and need to be improved. At the core of this is a hydrogen fuel cell-powered airplane. By using an argon flute tank with a two-layer tank structure with an aircraft frame of -253°C ~ room temperature, pressure resistance ~ 90MPa, the system that drives the power motor by discharging vaporized hydrogen gas by heating from the argon float tank filled with ultra-low temperature liquefied hydrogen gas and generating electricity by reacting with oxygen in the atmosphere is the maximum functional efficiency. GPI pipe tanks made of carbon fiber and VE resin are the best for weight reduction, and since a tank that can store 1 kg of hydrogen fuel can be made with 10 kg, it has been found to be the top efficiency that can achieve a cruising range of 20,000 km for large aircraft.
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  • 2024Volume 10Issue 1 Pages 31-36
    Published: December 31, 2024
    Released on J-STAGE: September 10, 2025
    JOURNAL OPEN ACCESS
    Aircraft that use fossil fuels emit large amounts of carbon dioxide and need to be improved. At the core of this is a hydrogen fuel cell-powered airplane. By using an argon flute tank with a two-layer tank structure with an aircraft frame of -253°C ~ room temperature, pressure resistance ~ 90MPa, the system that drives the power motor by discharging vaporized hydrogen gas by heating from the argon float tank filled with ultra-low temperature liquefied hydrogen gas and generating electricity by reacting with oxygen in the atmosphere is the maximum functional efficiency. GPI pipe tanks made of carbon fiber and VE resin are the best for weight reduction, and since a tank that can store 1 kg of hydrogen fuel can be made with 10 kg, it has been found to be the top efficiency that can achieve a cruising range of 20,000 km for large aircraft.
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  • 2024Volume 10Issue 1 Pages 37-40
    Published: December 31, 2024
    Released on J-STAGE: September 10, 2025
    JOURNAL OPEN ACCESS
    GPI-standard FRP pipes have different topcoat specifications for underground pipes and above-ground piping. Ground piping materials are required to have a topcoat to prevent deterioration of ultraviolet rays on the outer surface. In order to prevent deterioration of the reinforced layer, it is necessary to add a material that prevents ultraviolet deterioration to the topcoat layer. In the GPI standard centrifugal molding method, the addition of a material lamination that serves as a topcoat layer and an ultraviolet shielding material that centrifuges is the technical standard for ground piping. In addition, the technical standard for on-site lamination work, such as the joint construction of above-ground piping, requires a topcoat lamination to prevent ultraviolet rays of the GPI technical standard construction.
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  • 2024Volume 10Issue 1 Pages 41-44
    Published: December 31, 2024
    Released on J-STAGE: September 10, 2025
    JOURNAL OPEN ACCESS
    GPI-standard FRP pipes have different topcoat specifications for underground pipes and above-ground piping. Ground piping materials are required to have a topcoat to prevent deterioration of ultraviolet rays on the outer surface. In order to prevent deterioration of the reinforced layer, it is necessary to add a material that prevents ultraviolet deterioration to the topcoat layer. In the GPI standard centrifugal molding method, the addition of a material lamination that serves as a topcoat layer and an ultraviolet shielding material that centrifuges is the technical standard for ground piping. In addition, the technical standard for on-site lamination work, such as the joint construction of above-ground piping, requires a topcoat lamination to prevent ultraviolet rays of the GPI technical standard construction.
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  • 2024Volume 10Issue 1 Pages 45-48
    Published: December 31, 2024
    Released on J-STAGE: September 10, 2025
    JOURNAL OPEN ACCESS
    The durability of steel pipes used in casing pipes for deep wells such as oil wells and hot spring wells is said to be around 10 years, and FRP casing tubes with semi-flush contact with GPI standards that do not corrode are often used to repair corrosion damage. Research and development of efficient lifting functions such as pulling out interior pipes necessary for the maintenance of these interior corrosion-resistant FRP pipes is required, and we have been able to propose a jig with a lifting function for falling interior pipes and solidified interior pipes, which has been difficult in the past.
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  • 2024Volume 10Issue 1 Pages 49-54
    Published: December 31, 2024
    Released on J-STAGE: September 10, 2025
    JOURNAL OPEN ACCESS
    The durability of steel pipes used in casing pipes for deep wells such as oil wells and hot spring wells is said to be around 10 years, and FRP casing tubes with semi-flush contact with GPI standards that do not corrode are often used to repair corrosion damage. Research and development of efficient lifting functions such as pulling out interior pipes necessary for the maintenance of these interior corrosion-resistant FRP pipes is required, and we have been able to propose a jig with a lifting function for falling interior pipes and solidified interior pipes, which has been difficult in the past.
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  • (Applicable standards for adverse effects and their resolution) (J)
    2024Volume 10Issue 1 Pages 55-59
    Published: December 31, 2024
    Released on J-STAGE: September 10, 2025
    JOURNAL OPEN ACCESS
    Rice bran, rice husks, and rice straw, which are by-products of rice, are used as food, except for rice bran oil, which is squeezed out of rice bran. There is no direct food use. The main applications are carbonized fuels such as dried and solidified biomass pellets and biomass coke, compost fertilizer for agricultural crops from carbohydrates, and tatami matrix as dry material. On the other hand, as a measure against pests related to rice from pest control in agriculture and fisheries, all secondary processed products derived from rice are prohibited from being imported, and biomass pellets, which are ISO standard for fuel, are no exception. This is regarded as a problem by international convention and also poses a barrier to domestic industry. The GUBS Society's International Standardization Promotion Study Group will publish the results of a case study of ISO biomass pellets, which conducted research to eliminate the harms of regulation without benefits and standardize applicable standards for increasing social benefits.
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  • (Applicable standards for adverse effects and their resolution) (E)
    2024Volume 10Issue 1 Pages 60-67
    Published: December 31, 2024
    Released on J-STAGE: September 10, 2025
    JOURNAL OPEN ACCESS
    Rice bran, rice husks, and rice straw, which are by-products of rice, are used as food, except for rice bran oil, which is squeezed out of rice bran. There is no direct food use. The main applications are carbonized fuels such as dried and solidified biomass pellets and biomass coke, compost fertilizer for agricultural crops from carbohydrates, and tatami matrix as dry material. On the other hand, as a measure against pests related to rice from pest control in agriculture and fisheries, all secondary processed products derived from rice are prohibited from being imported, and biomass pellets, which are ISO standard for fuel, are no exception. This is regarded as a problem by international convention and also poses a barrier to domestic industry. The GUBS Society's International Standardization Promotion Study Group will publish the results of a case study of ISO biomass pellets, which conducted research to eliminate the harms of regulation without benefits and standardize applicable standards for increasing social benefits.
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  • 2024Volume 10Issue 1 Pages 68-72
    Published: December 31, 2024
    Released on J-STAGE: September 10, 2025
    JOURNAL OPEN ACCESS
    Water-soluble amorphous silica, said to be a representative health food, is contained in rice husks at about 20%. To avoid the formation of glassy crystalline silica when rice husks are fired at high temperatures, rice husks were traditionally fired for long periods of time in sealed electric furnaces. In this study, the authors succeeded in developing an amorphous silica firing rotary kiln that enables energy-saving self-ignition firing by controlling the amount of combustion oxygen and electrically heating the rotary kiln body.
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  • 2024Volume 10Issue 1 Pages 73-79
    Published: December 31, 2024
    Released on J-STAGE: September 10, 2025
    JOURNAL OPEN ACCESS
    Water-soluble amorphous silica, said to be a representative health food, is contained in rice husks at about 20%. To avoid the formation of glassy crystalline silica when rice husks are fired at high temperatures, rice husks were traditionally fired for long periods of time in sealed electric furnaces. In this study, the authors succeeded in developing an amorphous silica firing rotary kiln that enables energy-saving self-ignition firing by controlling the amount of combustion oxygen and electrically heating the rotary kiln body.
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  • 2024Volume 10Issue 1 Pages 80-83
    Published: December 31, 2024
    Released on J-STAGE: September 10, 2025
    JOURNAL OPEN ACCESS
    One way to solve the problem is to develop assistive devices that enable the elderly to perform manual tasks that cannot be done by machines. This study reports the results of research on agricultural work aids for vegetable cultivation. Agricultural work such as cultivating vegetables, growing seedlings, cultivating fruits, and pruning, which cannot be done by machines such as cultivators, rice planters, and threshers, is not suitable for the elderly, such as moving, transporting, and moving up and down. In order to make these tasks possible for the elderly, we report on the results of research and development of a tentative name [Rakuchin 4-Wheeled Bicycle], which is a sitting work for wheelchair mobility that does not require walking or standing work. [Rakuchin] means easy in Japanese.
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  • 2024Volume 10Issue 1 Pages 84-89
    Published: December 31, 2024
    Released on J-STAGE: September 10, 2025
    JOURNAL OPEN ACCESS
    One way to solve the problem is to develop assistive devices that enable the elderly to perform manual tasks that cannot be done by machines. This study reports the results of research on agricultural work aids for vegetable cultivation. Agricultural work such as cultivating vegetables, growing seedlings, cultivating fruits, and pruning, which cannot be done by machines such as cultivators, rice planters, and threshers, is not suitable for the elderly, such as moving, transporting, and moving up and down. In order to make these tasks possible for the elderly, we report on the results of research and development of a tentative name [Rakuchin 4-Wheeled Bicycle], which is a sitting work for wheelchair mobility that does not require walking or standing work. [Rakuchin] means easy in Japanese.
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  • (Nuclear waste disposal in the natural circulation of the earth's crust is optimal)
    2024Volume 10Issue 1 Pages 90-97
    Published: December 31, 2024
    Released on J-STAGE: September 10, 2025
    JOURNAL OPEN ACCESS
    The universe was born 20 billion years ago, and the earth is said to have been born aboMyaut 4 billion years ago, and the natural world full of romance is full of romance, and the origin of life has been revealed from the generation of matter brought about by the macrocosm, and the birth of life from nuclear energy. Since the transformation of these materials originated from the enormous energy of nuclear fission and fusion, the basic law of nuclear energy that can be used by humankind is that the law of use in accordance with the natural cycle of the macrocosm is indispensable. In other words, since the Earth is also a natural reactor structure, the natural circulation of nuclear waste is indispensable for the use of artificial nuclear energy in accordance with the movement of the earth's structure of crustal circulation and regeneration.
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  • Nearly zero energy apartments
    2024Volume 10Issue 1 Pages 98-105
    Published: December 31, 2024
    Released on J-STAGE: September 10, 2025
    JOURNAL OPEN ACCESS
    With the spread of private solar power generation and the rise in public electricity rates, the need to use private electricity has increased, requiring the development of low-cost storage batteries and power supply controllers. This research study further deepens the research results reported in the previous GPI Journal Vol.8,No.1. We have discovered that by developing low-cost energy storage equipment for individual homes and apartment complexes with power generation panels installed over an area of 100 to 1,000 square meters, it is possible to reduce existing electricity costs to one-third or less.
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  • 2024Volume 10Issue 1 Pages 106-116
    Published: December 31, 2024
    Released on J-STAGE: September 10, 2025
    JOURNAL OPEN ACCESS
    This is a case study in which modern Japan, where excessive assertion of rights has become a social problem in a democratic society of rights and obligations, is evaluated as a biased and individualistic society in the eyes of the international community. Excessive assertion of rights (customer harassment) and reverse harassment (claims, fraudulent acts) are social problems that arise in the process of democratic development. In this study, we summarize and report the results of research on the problem of excessive demand for services and excessive claims of rights that are socially accepted by AI standards in the age of SNS, and excessive claims of rights that lead to fraudulent acts, based on cases encountered by the authors, and research results on how to deal with them, taking into account different international perceptions and academic analysis.
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  • 2024Volume 10Issue 1 Pages 117-128
    Published: December 31, 2024
    Released on J-STAGE: September 10, 2025
    JOURNAL OPEN ACCESS
    Based on the hypothesis that the future will be inherited from the ancient times of mankind, from the perspective of the physical sciences consisting of time, mass, and energy, which are said to make up the 20 billion year of the macrocosm, the 4 billion year of the Earth, and the 40,000 years of the birth of mankind, and the logical information science such as DNA, which does not have these unit systems, we will try to explore the universality of bold matter. As for the expected research results, it has been found that the formation of logic based on the scientific information of materials, such as carbon isotope analysis used for dating, and the historical information inherited by mankind are very effective in predicting the future of humankind, so further research development is expected.
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