The basic equations of the representation of plasticity at an interface crack by an inclined strip yield superdislocation model are derived. With a special combination of the material properties and small-scale yieldi...The basic equations of the representation of plasticity at an interface crack by an inclined strip yield superdislocation model are derived. With a special combination of the material properties and small-scale yielding case, the problem is reduced to an algebraic equation in an unknown, the ratio of the plastic zone size. Some discussions on the limitations of this model are presented.展开更多
Two topics were focused. The first one was about the gamma-ray scintillator, Pr^3＋：Lu3Al5O12 （LuAG）. The second one was about neutron scintillator, Ce^3＋：^6LiCaAlF6 and Eu^2＋：^6LiCaAlF6 （^6LiCAF）. Those scin...Two topics were focused. The first one was about the gamma-ray scintillator, Pr^3＋：Lu3Al5O12 （LuAG）. The second one was about neutron scintillator, Ce^3＋：^6LiCaAlF6 and Eu^2＋：^6LiCaAlF6 （^6LiCAF）. Those scintillators have been developed very recently for modem imaging applications in the medical and homeland security fields. In both cases, the rare earth ions are playing the crucial role as emission centers. Pr^3＋ in LuAG provided fast 5d→4f transition providing noticeably shorter decay time than that of Ce^3＋. Among several candidate hosts, LuAG showed the best performance. Bulk crystal growth, basic scintillation properties, two-dimensional gamma-ray imaging and positron emission mammography （PEM） application were demonstrated. Due to the international situation, the homeland security was compromized by illicit traffic of explosives, drugs, nuclear materials, etc. and the ways to its improvement became an important R＆D topic. For this purpose the Ce and Eu doped LiCAF appeared competitive candidates. Especially, when substitution of 3He neutron detectors was considered, the discrimination ability of gamma-ray from alpha-ray was important. Bulk crystal growth, basic scintillation properties and two-dimensional neutron imaging were demonstrated.展开更多
The present work deals with the integration of remote-sensing,surface-geology and gravity-survey data to improve the structural knowledge of the Tarhunah area,northwest Libya.Geological information and remote-sensing ...The present work deals with the integration of remote-sensing,surface-geology and gravity-survey data to improve the structural knowledge of the Tarhunah area,northwest Libya.Geological information and remote-sensing data provided information about the surface structure.A gravity survey was conducted to decipher the subsurface structure.The results revealed that a basin having a width of 39 to 48 km trends NE.A two-dimensional(2-D)schematic model shows that the basin gradually deepens toward the southwest.Faults determined from a horizontal gradient,tilt derivative,and Euler deconvolution show a depth range of 2.5 to 7.5 km.The integration and interpretation of the results indicate that volcanic activity was related to the tectonic activity of an anticlinal structure called the Jabal Uplift.展开更多
基金Visiting Research Fellow in Institute of Industrial Science.University of Tokyo,supported by Japan Society for the Promotion of Science.
文摘The basic equations of the representation of plasticity at an interface crack by an inclined strip yield superdislocation model are derived. With a special combination of the material properties and small-scale yielding case, the problem is reduced to an algebraic equation in an unknown, the ratio of the plastic zone size. Some discussions on the limitations of this model are presented.
基金Project supported by Japan Science and Technology Agency,Regional Research and Development Resources Utilization Program,Ministry of Education,Culture,Sports,Science and Technology of Japanese government,Grant-in-Aid for Young Scientists (A)the joint project between JSPS and ASCR (19686001 (AY))+2 种基金Czech GAAV Project (M100100910)the Funding Program for Next Generation World-Leading ResearchersJapan Society for Promotion of Science
文摘Two topics were focused. The first one was about the gamma-ray scintillator, Pr^3＋：Lu3Al5O12 （LuAG）. The second one was about neutron scintillator, Ce^3＋：^6LiCaAlF6 and Eu^2＋：^6LiCaAlF6 （^6LiCAF）. Those scintillators have been developed very recently for modem imaging applications in the medical and homeland security fields. In both cases, the rare earth ions are playing the crucial role as emission centers. Pr^3＋ in LuAG provided fast 5d→4f transition providing noticeably shorter decay time than that of Ce^3＋. Among several candidate hosts, LuAG showed the best performance. Bulk crystal growth, basic scintillation properties, two-dimensional gamma-ray imaging and positron emission mammography （PEM） application were demonstrated. Due to the international situation, the homeland security was compromized by illicit traffic of explosives, drugs, nuclear materials, etc. and the ways to its improvement became an important R＆D topic. For this purpose the Ce and Eu doped LiCAF appeared competitive candidates. Especially, when substitution of 3He neutron detectors was considered, the discrimination ability of gamma-ray from alpha-ray was important. Bulk crystal growth, basic scintillation properties and two-dimensional neutron imaging were demonstrated.
文摘The present work deals with the integration of remote-sensing,surface-geology and gravity-survey data to improve the structural knowledge of the Tarhunah area,northwest Libya.Geological information and remote-sensing data provided information about the surface structure.A gravity survey was conducted to decipher the subsurface structure.The results revealed that a basin having a width of 39 to 48 km trends NE.A two-dimensional(2-D)schematic model shows that the basin gradually deepens toward the southwest.Faults determined from a horizontal gradient,tilt derivative,and Euler deconvolution show a depth range of 2.5 to 7.5 km.The integration and interpretation of the results indicate that volcanic activity was related to the tectonic activity of an anticlinal structure called the Jabal Uplift.
