The conventional long-offset nonhyperbolic moveout equation is derived for the transverse isotropic media with a vertical symmetric axis（VTI）.It cannot be extended to the transverse isotropic media with an arbitrary...The conventional long-offset nonhyperbolic moveout equation is derived for the transverse isotropic media with a vertical symmetric axis（VTI）.It cannot be extended to the transverse isotropic media with an arbitrary spatial orientation of symmetry axis（ATI）.In this paper,we optimize a modified long-offset nonhyperbolic moveout equation for ATI media based on the conventional nonhyperbolic moveout equation and the exact analytical solution of the quartic moveout coefficient（A_4） and NMO velocity for ATI media that were derived in our previous work.Compared with the exact traveltimes of the ray-tracing algorithm for anisotropic media,this optimized equation can be used to calculate the traveltime varying with survey line azimuth in arbitrary strong or weak ATI media.It can replace the time-consuming, multi-offset,and multi-azimuth ray tracing method for forward modeling of long-offset reflection traveltimes in ATI media,which is useful to further anisotropic parameter inversion using long-offset nonhyperbolic moveout.展开更多
More than 4,000,000 immigrants traveled from Italy to the United States between 1880 and 1924. Most were peasants, largely illiterate, and with no sense of an Italian identity as their ancestral home had only been lib...More than 4,000,000 immigrants traveled from Italy to the United States between 1880 and 1924. Most were peasants, largely illiterate, and with no sense of an Italian identity as their ancestral home had only been liberated from centuries of foreign rule in 1861. This study utilizes primary and secondary documents, as well as archival sources and interviews to determine the role of sport in the transition to an Italian identity, and then an American identity within the assimilation process. Second generation youth adopted American sport forms, and some became national heroes in contrast to the stereotype of Italian gangsters. By the 1950s Italians had become icons of popular culture, yet negative stereotypes persisted and assimilation remained fragmented.展开更多
We give a study on the general Moiler transformation and emphatically introduce its differential form. In this paper, a definition of acceleration is given in spacetime language and the inertial reference frame is als...We give a study on the general Moiler transformation and emphatically introduce its differential form. In this paper, a definition of acceleration is given in spacetime language and the inertial reference frame is also settled. With a discussion of the geodesic equations of motion, the differential form of the general MФller transformation at arbitrary direction is presented.展开更多
We study entanglement dynamics of three-qubit system via negativity. Three atoms A, B, and C interact isolatedly with their own Jaynes-Cummings cavities a, b, and c. Aa system is prepared entangled with Bb and Cc, how...We study entanglement dynamics of three-qubit system via negativity. Three atoms A, B, and C interact isolatedly with their own Jaynes-Cummings cavities a, b, and c. Aa system is prepared entangled with Bb and Cc, however, their mutual isolations forbid Aa interacting with system Bb and Cc. It is the same for system Bb and Cc. We show entanglement evolution of different three-qubit systems ABC, abc, Abc, and aBC and find entanglement sudden death effect.展开更多
This paper reports on a series of Consciousness-Raising （C-R） activities focusing on prefabricated verbs chunks and verb patterns. An 18-week experiment was carried out incorporating the C-R activities into a Compre...This paper reports on a series of Consciousness-Raising （C-R） activities focusing on prefabricated verbs chunks and verb patterns. An 18-week experiment was carried out incorporating the C-R activities into a Comprehensive English Course. A writing task and semi-structured interviews were administered after the experiment. Results indicated that （1） the frequency and accuracy of verb patterns used by Experimental Group （EG） were higher than those in the Control Group （CG）; （2） C-R activities promoted the use of the students’ reference material and their ability to notice gaps in meaning, enhanced their interest and confidence in learning English, and guided their personal learning of vocabulary; （3） the EG generally liked the activities.展开更多
基金the National Natural Science Foundation of China(Grant No.40874028)the Special Fund (Grant No.2008ZX05008-006-004).
文摘The conventional long-offset nonhyperbolic moveout equation is derived for the transverse isotropic media with a vertical symmetric axis（VTI）.It cannot be extended to the transverse isotropic media with an arbitrary spatial orientation of symmetry axis（ATI）.In this paper,we optimize a modified long-offset nonhyperbolic moveout equation for ATI media based on the conventional nonhyperbolic moveout equation and the exact analytical solution of the quartic moveout coefficient（A_4） and NMO velocity for ATI media that were derived in our previous work.Compared with the exact traveltimes of the ray-tracing algorithm for anisotropic media,this optimized equation can be used to calculate the traveltime varying with survey line azimuth in arbitrary strong or weak ATI media.It can replace the time-consuming, multi-offset,and multi-azimuth ray tracing method for forward modeling of long-offset reflection traveltimes in ATI media,which is useful to further anisotropic parameter inversion using long-offset nonhyperbolic moveout.
文摘More than 4,000,000 immigrants traveled from Italy to the United States between 1880 and 1924. Most were peasants, largely illiterate, and with no sense of an Italian identity as their ancestral home had only been liberated from centuries of foreign rule in 1861. This study utilizes primary and secondary documents, as well as archival sources and interviews to determine the role of sport in the transition to an Italian identity, and then an American identity within the assimilation process. Second generation youth adopted American sport forms, and some became national heroes in contrast to the stereotype of Italian gangsters. By the 1950s Italians had become icons of popular culture, yet negative stereotypes persisted and assimilation remained fragmented.
文摘We give a study on the general Moiler transformation and emphatically introduce its differential form. In this paper, a definition of acceleration is given in spacetime language and the inertial reference frame is also settled. With a discussion of the geodesic equations of motion, the differential form of the general MФller transformation at arbitrary direction is presented.
文摘We study entanglement dynamics of three-qubit system via negativity. Three atoms A, B, and C interact isolatedly with their own Jaynes-Cummings cavities a, b, and c. Aa system is prepared entangled with Bb and Cc, however, their mutual isolations forbid Aa interacting with system Bb and Cc. It is the same for system Bb and Cc. We show entanglement evolution of different three-qubit systems ABC, abc, Abc, and aBC and find entanglement sudden death effect.
文摘This paper reports on a series of Consciousness-Raising （C-R） activities focusing on prefabricated verbs chunks and verb patterns. An 18-week experiment was carried out incorporating the C-R activities into a Comprehensive English Course. A writing task and semi-structured interviews were administered after the experiment. Results indicated that （1） the frequency and accuracy of verb patterns used by Experimental Group （EG） were higher than those in the Control Group （CG）; （2） C-R activities promoted the use of the students’ reference material and their ability to notice gaps in meaning, enhanced their interest and confidence in learning English, and guided their personal learning of vocabulary; （3） the EG generally liked the activities.
