The exchange bias of bilayer magnetic films consisting of ferromagnetic （FM） and antiferromagnetic （AFM） layers in an uncompensated case is studied by use of the many-body Green＇s function method of quantum stati...The exchange bias of bilayer magnetic films consisting of ferromagnetic （FM） and antiferromagnetic （AFM） layers in an uncompensated case is studied by use of the many-body Green＇s function method of quantum statistical theory. The effects of the layer thickness and temperature and the interracial coupling strength on the exchange bias HE are investigated. The dependence of the exchange bias HE on the FM layer thickness and temperature is qualitatively in agreement with experimental results. When temperature varies, both the coercivity HC and HE decrease with the temperature increasing. For each FM thickness, there exists a least AFM thickness in which the exchange bias occurs, which is called pinning thickness.展开更多
BACKGROUND Case studies(CS)are relevant for the development of theoretical and practical competencies in psychotherapy.Despite rapid progress in the development of methods and principles for establishing CS in the las...BACKGROUND Case studies(CS)are relevant for the development of theoretical and practical competencies in psychotherapy.Despite rapid progress in the development of methods and principles for establishing CS in the last three decades,research into the aims of CS,especially in training,or how CS are to be conducted is rare.AIM To elucidate the form and methodology of CS,the objectives of CS used in training institutions(TI),and if/how TIs handle therapist allegiance.Also,this preliminary investigation will suggest avenues for further research and attempt to establish certain guidelines.METHODS In order to counteract researcher bias and enlarge the question-pool,a focus group was established.The recorded and transcribed text was analyzed with Mayring’s method of qualitative content analysis,and the generated categories were formulated as questions.The resulting questionnaire with both qualitative and quantitative queries was sent out(after pre-testing)to all 39 Austrian TIs that provide professional psychotherapy training.The answers and text passages received were then also categorized with qualitative content analysis.Data analysis was discussed by a peer group consisting of three psychotherapists trained in differing schools of psychotherapeutic methods.RESULTS 94%of Austrian institutes use CS as part of their psychotherapeutic training.Understanding of the term“case study”is inconsistent and has a wide variety of interpretations.CS serve mainly:(1)For observation of training/progress in therapeutic practice and knowledge/acquisition of the theory specific to each psychotherapeutic school;(2)To improve(self-)reflection capabilities;and(3)To expand theoretical knowledge.Most of the CS written are not accessible for students nor for the research community.More than two thirds of the CS take only the position of the author into account(the client’s position is not described).15.5%of the TIs do not consider researcher or therapist allegiance at all.CONCLUSION A more precise formulation of the term case study is needed in psychotherapeutic training.The training therapists play a key function,as they exemplify and teach how to deal with distorting factors.General guidelines as to how to conduct CS in training institutions would provide more direction to students,increase scientific rigor,and enhance synergistic effects.展开更多
This paper proposes a unified semiparametric method for the additive risk model under general biased sampling. By using the estimating equation approach, we propose both estimators of the regression parameters and non...This paper proposes a unified semiparametric method for the additive risk model under general biased sampling. By using the estimating equation approach, we propose both estimators of the regression parameters and nonparametric function. An advantage is that our approach is still suitable for the lengthbiased data even without the information of the truncation variable. Meanwhile, large sample properties of the proposed estimators are established, including consistency and asymptotic normality. In addition, the finite sample behavior of the proposed methods and the analysis of three groups of real data are given.展开更多
基金Project supported by the National Natural Science Foundation of China （Grant Nos 10574121, 90406024 and 10025420）, Chinese Education Ministry and Chinese Academy of Sciences.
文摘The exchange bias of bilayer magnetic films consisting of ferromagnetic （FM） and antiferromagnetic （AFM） layers in an uncompensated case is studied by use of the many-body Green＇s function method of quantum statistical theory. The effects of the layer thickness and temperature and the interracial coupling strength on the exchange bias HE are investigated. The dependence of the exchange bias HE on the FM layer thickness and temperature is qualitatively in agreement with experimental results. When temperature varies, both the coercivity HC and HE decrease with the temperature increasing. For each FM thickness, there exists a least AFM thickness in which the exchange bias occurs, which is called pinning thickness.
文摘BACKGROUND Case studies(CS)are relevant for the development of theoretical and practical competencies in psychotherapy.Despite rapid progress in the development of methods and principles for establishing CS in the last three decades,research into the aims of CS,especially in training,or how CS are to be conducted is rare.AIM To elucidate the form and methodology of CS,the objectives of CS used in training institutions(TI),and if/how TIs handle therapist allegiance.Also,this preliminary investigation will suggest avenues for further research and attempt to establish certain guidelines.METHODS In order to counteract researcher bias and enlarge the question-pool,a focus group was established.The recorded and transcribed text was analyzed with Mayring’s method of qualitative content analysis,and the generated categories were formulated as questions.The resulting questionnaire with both qualitative and quantitative queries was sent out(after pre-testing)to all 39 Austrian TIs that provide professional psychotherapy training.The answers and text passages received were then also categorized with qualitative content analysis.Data analysis was discussed by a peer group consisting of three psychotherapists trained in differing schools of psychotherapeutic methods.RESULTS 94%of Austrian institutes use CS as part of their psychotherapeutic training.Understanding of the term“case study”is inconsistent and has a wide variety of interpretations.CS serve mainly:(1)For observation of training/progress in therapeutic practice and knowledge/acquisition of the theory specific to each psychotherapeutic school;(2)To improve(self-)reflection capabilities;and(3)To expand theoretical knowledge.Most of the CS written are not accessible for students nor for the research community.More than two thirds of the CS take only the position of the author into account(the client’s position is not described).15.5%of the TIs do not consider researcher or therapist allegiance at all.CONCLUSION A more precise formulation of the term case study is needed in psychotherapeutic training.The training therapists play a key function,as they exemplify and teach how to deal with distorting factors.General guidelines as to how to conduct CS in training institutions would provide more direction to students,increase scientific rigor,and enhance synergistic effects.
基金supported by National Institutes of Health of USA (Grant No. R01 HL113548)National Natural Science Foundation of China (Grant Nos. 11271155, 11371168, J1310022, 11571138, 11501241 and 71271128)+3 种基金Science and Technology Research Program of Education Department in Jilin Province for the 12th Five-Year Plan (Grant No. 440020031139)Jilin Province Natural Science Foundation (Grant Nos. 20130101066JC, 20130522102JH and 20150520053JH)the State Key Program of National Natural Science Foundation of China (Grant No. 71331006)National Center for Mathematics and Interdisciplinary Sciences and Shanghai University of Finance and Economics through Project 211 Phase IV and Shanghai Leading Academic Discipline Project A
文摘This paper proposes a unified semiparametric method for the additive risk model under general biased sampling. By using the estimating equation approach, we propose both estimators of the regression parameters and nonparametric function. An advantage is that our approach is still suitable for the lengthbiased data even without the information of the truncation variable. Meanwhile, large sample properties of the proposed estimators are established, including consistency and asymptotic normality. In addition, the finite sample behavior of the proposed methods and the analysis of three groups of real data are given.
