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6. Review of theoretical, experimental, and numerical studies on rotary percussive rock drilling.

Author

Hashiba, K. and Fukui, K.

Subjects
*STRESS waves, *THEORY of wave motion, *RESEARCH personnel, *MINING engineering, *CIVIL engineers, *CIVIL engineering, *DRILLING & boring
Abstract

Rotary percussion rock drills have been widely used in mining and civil engineering fields, and their performance needs to be further improved. To deeply understand the mechanisms of the rock drills, this article reviews the previous studies from fundamental theories to state-of-the-art techniques on the rotary percussive rock drilling processes, including stress wave propagation, dynamic bit penetration, and factors affecting drilling efficiency and penetration rates. An enormous variety of research approaches and their findings are provided to related researchers and engineers. In addition, important future issues are presented for discussing the further progress of rotary percussive rock drilling. [ABSTRACT FROM AUTHOR]

Published
2024
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8. Phobos Environment Model and Regolith Simulant for MMX Mission

Author

Miyamoto, H, Niihara, T, Wada, K, Ogawa, K, Baresi, N, Abell, Paul A, Asphaug, E, Britt, D, Dodbiba, G, Fujita, T, Fukui, K, Grott, M, Hashiba, K, Hemmi, R, Hong, P, Imada, T, Kikuchi, H, Michel, P, Mogi, K, and Nakamura, T

Subjects
Lunar And Planetary Science And Exploration
Abstract

Phobos and Deimos, the two moons of Mars, are considered to be scientifically important and potential human mission's target. Martian Moons eXplorer (MMX) is the JAXA's mission to explore Phobos (and/or Deimos), which is scheduled to be launched in 2024. The main spacecraft of MMX will perform in-situ observations of both Phobos and Deimos, land on one of them (most likely, Phobos), and bring samples back to Earth. Small landing modules may be included in the mission as for the Hayabusa-2 mission. The designs of both the landing and sampling devices depend largely on the surface conditions of the target body and on how this surface reacts to an external action in the low gravity conditions of the target. Thus, the Landing Operation Working Team (LOWT) of MMX, which is composed of both scientists and engineers, is studying Phobos' surface based on previous observations and theoretical/experimental considerations. Though engineering motivation initiated this activity, the results will be extremely useful for scientific purposes.

Published
2018

23. 1992 Scientific Session of the Society of American Gastrointestinal Surgeons (SAGES) Washington, D.C., USA, April 11–12, 1992

Author

Salky, Barry, Bauer, Joel, Easter, D. W., Cuschieri, A., Lavelle-Jones, M., Nathanson, L., Brandt, C. P., Priebe, P. P., Eckhauser, M. L., Henriques, III, Horace F., Deziel, Daniel J., Millikan, Keith W., Staren, Edgar D., Economou, Steven G., Lexer, G. W., Lexer, G. Ch., Lehofer, F., Meiser, G., Boeckl, O., Williams, Mark D., Murr, Peter C., Shimomura, Kazuyuki, Ohtomo, Yumiko, Ishizaki, Yoichi, Noie, Tamaki, Abe, Hideki, Nayeem, Sarder Abdun, Bandai, Yasutsugu, Idezuki, Yasuo, Kam, David, Scheeres, David, Nagai, Hideo, Kondo, Yasuo, Yasuda, Toshihiko, Kasahara, Kogoro, Kanazawa, Kyotaro, Wittgen, C. M., Andrus, J. P., Andrus, C. H., Kaminski, D. L., Fried, G. M., Sigman, H. H., Meakins, J. L., Hinchey, E. J., Garzon, J., Barkun, J. S., Mamazza, J., Wexler, M. J., Bordelon, B. M., Hobday, K. A., Hunter, J. G., Saunders, C. J., Gardiner, B., Leary, B. F., F. N. P., Frey, C. F., Wolfe, B. M., Kozarek, R. A., Traverso, L. W., Ball, T. J., Brandabur, J., Jolly, P. C., Patterson, D. J., Ryan, J. A., Thirlby, R. C., Wechter, D. G., Hunter, J. A., Fletcher, D. P., Molnar, Robert G., Apelgren, Keith N., Kisala, John M., Way, Lawrence W., Wetter, Albert, Pietrafitta, Joseph J., Schultz, Leonard S., Graber, John N., Hickok, David F., Congreve, D., Zinnecker, H., Lohmuller, J., Legrand, M., Detroz, B., Honore, P., Jacquet, N., Yamamoto, M., Stiegmann, G., Durham, J., Berguer, R., Fujiyama, Y., Oba, Y., Downey, J., Miho, O., Green, P., Satava, R., Hill, J., Simon, I., Brodish, R. J., Soper, Nathaniel J., Dunnegan, Deanna L., Peters, Jeffrey H., Innes, Jeffrey T., Front, Mary E., Ellison, E. Christopher, Swanstrom, Lee, Sangster, William, Stoker, Mark E., Phillips, E., Carroll, B., Fallas, M., Daykhovsky, L., Murphy, B., Miller, S., Keiter, N., Halpern, Norman B., Escudero-Fabre, Angel, Sack, Jonathan, Himal, H. S., Luchette F., Doerr R., Kulaylat M., Stephan R., Kelly K., Fowler, Dennis L., White, Sharon A., Church, James M., De Paula, A. L., Hashiba, K., Ambroze, Jr, W. L., Nezhat, C., Nezhat, F., Orangio, G., Brooks, D. C., Becker, J. M., Connors, P. J., Carr-Locke, D. L., Adams, D. B., Borowicz, M. R., Wootton, III, F. T., Cunningham, J. T., Cirocco, W. C., Rusin, L. C., Franceschi, Dido, Pritchard, Timothy, Eckhauser, Marc, Estes, J. M., Szabo, Z., Harrison, M. R., Krishnan, S. M., Goh, P. M. Y., Ambroze, Jr., W. L., Orangio, G. R., Tucker, J. G., Baird, D., Herndon, M., Lucas, G. W., Bell, R. C. W., Stiegmann, G. V., Sun, J., Kim, J., Lucia, M. S., Bender, J. S., Talamini, M. A., Bessler, Marc, Treat, Michael R., Canady, J., Nicolo, E., Jagdeo, C., McQueen, J., Fontana, F., Dewitty, R., Castellano, M., Elmann, E. M., Lobbato, V. J., Cosgrove, John M., Franklin, Howard, Margolis, Irving B., de la Torre, R., Donahue, PE, Schlesinger, P., Sluss, K., Attar, B., Nyhus, L. M., Anan, K., Fletcher, D. R., Flowers, J. L., Zucker, K. A., Graham, S. M., Scovill, W. A., Imbembo, A. L., Bailey, R. W., Gagner, M., Rheault, M., Dubuc, J., Ghobrial, Rafik, MacFadyen, Jr., Bruce V., Catalano, Mark, Raijman, Isaac, Haicken, Barry N., Daijo, Hashimoto, Shuji, Kajiwara, Takanobu, Hoshino, Fukuyo, Tsuneo, Kitano, S., Moriyama, M., Sugimachi, K., Kudo, Shin-ei, Kusaka, Takashi, Nakajima, Kouji, Kimata, Hiroyuki, Miura, Kouji, Takano, Yukio, Lamphier, Jonathan B., Diflo, Thomas, Kondi, Edward S., Larson, G. M., Vitale, G. C., Voight, W., Cheadle, W., Miller, F., Leahy, P. F., Pennino, R. P., Furman, R. H., Libutti, Steven K., Williams, Mathew R., Litwin, D., Johnson, D., Osachoff, J., Gallagher, C., Church, D., Mansour, M. A., Martin, Matt B., Abrams, Arkin, Ballen, Blievernicht, Bowman, Davis, Farley, Hoxworth, Ingram, Leone, Lindsey, Newman, Price, Streck, Weatherly, Young, Miscusi, Route G., Masoni, L., Gasparrini, M., Montori, A., Montori, A., Munakata, Y., Kawasaki, S., Hashikura, Y., Hashimoto, S., Hayashi, K., Numata, M., Makuuchi, M., Mustafa, I. A., Reed, W. P., Coe, N. P. W., Leigh H., Nadler, Nelson, M. T., Nakashima, M., Mulvihill, S. J., Olsen, Douglas O., Corbitt, John D., Edleman, David S., Unger, Stephen, Unger, Harold, Orkin, B. A., Smith, L. E., Paz-Partlow, M., Berci, G., Sackier, J. M., Miller, John, Kieth E., Nichols, Ollila, David, Gibbons, Gregory E., Davanzo, Mark A., Polacek, Michael A., Pons, R., Grannan, K., Welling, R., Pritchard, Timothy J., Richards, William O., Unger, S. W., Rosenbaum, G., Unger, H. M., Edelman, D. S., Schirmer, B. D., Dix, J., Schmieg, Jr., R. E., Aguilar, M., Schirmer, B. D., Dix, J., Scott, T. R., Zucker, K. A., Bailey, R. W., Bergstein, J. M., Seone, D., Wittmann, D. H., Quebbeman, E. J., Aprahamian, C., McGrath, Michael, Shapiro, Stephen, Gordon, Leo, Adashek, Kenneth, Daykhovsky, Leon, Shoop, Stephen A., Sackier, Jonathan, Meakin, J. L., Snyder, Samuel K., Symmonds, Richard E., Roberts, John W., Hendricks, John C., Smith, Randall W., Frazee, Richard C., Soper, Nathaniel J., Brunt, L. Michael, Fleshman, James, Meininger, Thomas A., Dunnegan, Deanna L., RN, Sudan, Debra, Mellinger, John, Miller, Sidney, Sugawa, C., Lucas, C. E., Szabo, Zoltan, Berci, George, Hunter, John G., Unger, S. W., Unger, H. M., Edelman, D. S., Weaver, Donald W., Bouwman, David, Tyburski, James, and Wierson, T. A.

Published
1992
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27. Twenty-Year Creep Test with Tuff under Uniaxial Compression

Author

Hashiba, K. and Fukui, K.

Abstract

A creep test is a helpful method for investigating the long-term deformation of rock. However, most previous creep tests on rock were carried out for less than a few weeks, and only a handful were performed for longer time periods. This article reports an ongoing long-term creep test that was started in 1997 and reached its twentieth year in 2017. This uniaxial compressive creep test has been conducted with tuff under water at a creep stress of 30 % of its short-term strength. An overview of the creep test is described first in this article, including the test method and long-term maintenance. Daily maintenance and countermeasures against possible problems are indispensable so as to not require halting of the test. During the test, the test apparatus was transferred twice due to the reconstruction of the building containing the laboratory, but the test was not halted during the transfers. The recorded creep strain over a period of 20 years included a variety of environmental noise such as slight changes in the air pressure in the cylinder and in temperature and humidity. Hence, annual averages of the strain were used for understanding the long-term trend, and the trend was found to be approximated by a power function of time. The recorded creep strain was compared with the results of short-term creep tests and the stress-strain curves in strength tests. The authors believe that the test in this study is the longest uniaxial compressive creep test with a rock specimen that has been carried out.

Published
2020
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28. Abnormal atrial endocardial electrograms in aging patients with idiopathic paroxysmal atrial fibrillation

Author

Centurión, OA, Shimizu, A, Isomoto, S, Konoe, A, Yano, K, and Hashiba, K

Subjects
miocardio auricular, advancing age, atrial myocardium, tercera edad, mapeo auricular endocárdico con catéter, fibrilación auricular paroxística idiopática, idiopathic paroxysmal atrial fibrillation, sense organs, atrial endocardial catheter mapping
Abstract

Los pacientes de la tercera edad están particularmente predispuestos a desarrollar episodios de fibrilación auricular paroxística (FAP), pudiendo ser los cambios que experimenta el miocardio auricular un factor contribuyente a la aparición de este fenómeno con el correr de los años. Por ende, diseñamos este trabajo con la idea de investigar los cambios que se producen en los electrogramas auriculares endocárdicos registrados por medio de un mapeo intraauricular con catéter en pacientes con FAP idiopática en la tercera edad. Realizamos un mapeo endocárdico con catéter de la aurícula derecha en ritmo sinusal en 72 pacientes con FAP idiopática para evaluar la influencia de la edad avanzada en los electrogramas auriculares endocárdicos. Los electrogramas bipolares fueron registrados de 12 sitios de la aurícula derecha, y un electrograma endocárdico auricular anormal fue definido como aquel que posee una duración ≥100 ms, y/o 8 o más deflexiones fragmentadas. Se registraron 864 electrogramas auriculares endocárdicos que fueron analizados cuantitativamente. El número de electrogramas auriculares anormales, así como la máxima duración y el mayor número de deflexiones fragmentadas de los electrogramas auriculares endocárdicos en los pacientes con FAP idiopática tuvo una correlación significativamente positiva con la edad. Se observó que la edad avanzada altera las propiedades electrofisiológicas del miocardio auricular haciéndolo más susceptible a desarrollar episodios de FAP. Estos cambios electrofisiológicos son más extensos conforme aumenta la edad. Existe un aumento progresivo en la extensión de la anormalidad electrofisiológica del miocardio auricular en pacientes de la tercera edad con fibrilación auricular paroxística idiopática. There is a predisposition to develop paroxysmal atrial fibrillation (PAF) in aging patients, and the atrial muscle changes due to the aging process could be a contributing factor to the development of this tachyarrhythmia. Thus, we designed this study to investigate the changes observed in the recorded atrial endocardial electrograms by means of an intra-atrial catheter mapping in patients with idiopathic PAF. We performed an endocardial mapping of the right atrium in 72 patients with idiopathic PAF during sinus rhythm to evaluate the influence of advancing age on the atrial endocardial electrograms. The bipolar electrograms were recorded at 12 sites of the right atrium and an abnormal atrial electrogram was defined as having a duration ≥100 ms, and/or eight or more fragmented deflections. We recorded 864 atrial endocardial electrograms that were quantitatively analyzed. The number of abnormal atrial electrograms, as well as the wider duration and the greater number of fragmented deflections of the atrial endocardial electrograms, showed a significant positive correlation with aging in patients with idiopathic PAF. It was observed that aging alters the electrophysiological properties of the atrial muscle increasing the susceptibility to develop episodes of PAF. These electrophysiological changes are more extensive in advancing age. There is a progressive increase in the extension of the electrophysiologically altered atrial muscle in aging patients with idiopathic PAF.

Published
2014

33. Endoscopic suprapapillary blunt dissection of the distal common bile duct in cases of difficult cannulation: a pilot series

Author

Hashiba K, Hassegawa Rt, Saverio T. N. Armellini, Cappellanes Ca, Marco A. D'Assuncao, and Daniel Moribe

Subjects
Adult, medicine.medical_specialty, Ampulla of Vater, Biliary Tract Diseases, Perforation (oil well), Forceps, Pilot Projects, Dissection (medical), Catheterization, Distal Common Bile Duct, Sphincterotomy, Endoscopic, Postoperative Complications, Blunt dissection, medicine, Electrocoagulation, Humans, Aged, Aged, 80 and over, Cholangiopancreatography, Endoscopic Retrograde, Common Bile Duct, Common bile duct, business.industry, Dissection, Gastroenterology, Middle Aged, medicine.disease, Surgery, Major duodenal papilla, medicine.anatomical_structure, Treatment Outcome, Biliary tract, Female, Safety, business
Abstract

Background and Study Aims: There is no consensus about the optimal alternative procedure in cases of failed cannulation of the common bile duct (CBD). The alternatives are usually considered to be high-risk procedures. This study describes endoscopic dissection of the distal biliary tract (EDBT) as a new technique in cases of difficult cannulation of the CBD. Patients and Methods: Out of a total of 1057 patients in whom cannulation was attempted, deep cannulation failed in 49 patients, and 48 of those underwent EDBT. The procedure consists of cutting the mucosa, and the partial isolation of the distal part of the biliary tract using catheters, a needle-knife papillotome, and thin forceps. Access to the biliary tract was achieved with an endoscopic needle or forceps with or without electrocoagulation. Results: EDBT was successful in all cases. In 46 patients EDBT was followed by standard sphincterotomy. Four patients developed clinical pancreatitis and hyperamylasemia occurred in 11 cases. Perforation, uncontrolled bleeding, and other complications did not occur in this series. Conclusions: EDBT is feasible, safe and constitutes a potential alternative for cannulation of the CBD. The endoscopic visualization of the wall structure and duodenal layers during the maneuvers at the papilla probably accounts for the absence of major complications.

Published
2004

38. FEM analysis of time-dependent behaviour and failure process of deep shaft.

Author

Hashiba K., Sato T., Hashiba K., and Sato T.

Abstract

Non-linear rheological constitutive equations for rock were used to simulate the time-dependent behaviour and the failure process of a deep shaft, with particular reference to the effect of gravity and the deformation behaviour parallel to the direction of excavation. The model was applied to a 1 000 m deep shaft to study the effect of rock properties and rock stress conditions. The results showed that the time-dependency, ductility, Poisson's ratio for the rock mass and ratio between the horizontal and vertical rock stresses affected the failure process around the bottom of the shaft. Simulations using vertically and horizontally loaded disc-shaped models were also carried out. The vertical deformation of the shaft wall was much smaller than the radial deformation just before failure, but the vertical rock stress and gravity had a significant effect on the failure process and the long-term stability of the shaft., Non-linear rheological constitutive equations for rock were used to simulate the time-dependent behaviour and the failure process of a deep shaft, with particular reference to the effect of gravity and the deformation behaviour parallel to the direction of excavation. The model was applied to a 1 000 m deep shaft to study the effect of rock properties and rock stress conditions. The results showed that the time-dependency, ductility, Poisson's ratio for the rock mass and ratio between the horizontal and vertical rock stresses affected the failure process around the bottom of the shaft. Simulations using vertically and horizontally loaded disc-shaped models were also carried out. The vertical deformation of the shaft wall was much smaller than the radial deformation just before failure, but the vertical rock stress and gravity had a significant effect on the failure process and the long-term stability of the shaft.

Published
2008

39. Improving hand hygiene adherence in an endoscopy unit

Author

Santos, L., additional, Souza Dias, M., additional, Borrasca, V., additional, Cavassin, L., additional, Deso di Lobo, R., additional, Bozza Schwenck, R., additional, Herrerias Puschiavo, T., additional, Toscano, C., additional, Hashiba, K., additional, and Bierrenbach, A., additional

Published
2013
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41. Capacitive micromachined ultrasonic transducer with driving voltage over 100 V and vibration durability over 1011 cycles

Author

Machida, S., primary, Kobayashi, T., additional, Degawa, M., additional, Takezaki, T., additional, Tanaka, H., additional, Migitaka, S., additional, Hashiba, K., additional, Enomoto, H., additional, Nagata, T., additional, Yoshimura, Y., additional, Asafusa, K., additional, Ishida, K., additional, Sano, S., additional, and Izumi, M., additional

Published
2009
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