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| 1 | STUDY ON HARVESTED POPULATION WITH DIFFUSIONAL MIGRATION显示文摘This paper is devoted to the study of the dynamical behavior and harvesting problem of an exploited population with diffusional migration, for which a protective patch is established. We examine the effects of protective patch and harvest on the population resources and conclude that the protective patch is effective for the conservation of population resources and ecological environment, though in some cases the extinction can not be eliminated. The dangerous region, the parameters domains and the typical bifurcation curves of stability of steady states for the considered system are determined. The optimal harvest policy for the considered population is made also. The explicit expressions are obtained for the optimal harvesting effort, the maximum sustainable yield and the corre- sponding population density. Our results provide a theoretical evidence for the practical management of biological resources. | FAN Meng WANG Ke (Deportment of Mathematics, Northeast Normal University, Changchun 130024, China) ZHANG Yujuan ZHANG Shuwen LIU Huimin (Department of Mathematics, Anshan Teacher’s College, Anshan 114005, China) | 2001 | Journal of Systems Science & Complexity2001，14，2： | 7 |
| 2 | Influence of Mannan oligosaccharide,Ligustrum lucidum and Schisandra chinensis on parameters of antioxidative and immunological status of broflers显示文摘 | Deying M Qundao L Anshan S | 2006 | Archives of Auimal Nutrition2006，6，： | 1 |
| 3 | Effect of Ligustrum lucidum and Schisandra chinessis on the egg production, antioxidant status and immunity of laying hens during heat stress显示文摘 | Deying M Anshan S Zhihui C | 2005 | Archives of Animal Nutrition2005，59，6： | 1 |
| 4 | Perspectives on Socialization Factors in University Students in the People's Republic of China and the United States显示文摘This paper focuses on the socialization factors of undergraduate students that lead to the readiness for education.Factors such as parental socialization,student background characteristics,pre college normative pressures and influences,and non college refernce groups will be helpful in relating to reality of undergraduate students.This information will help both faculty and administrators meet the needs of students by understanding the processes of development and change in their college years. | Song Zhong Chi Fiona Mackinnon Slaney (Lecturer,Anshan Teachers College,Liaoning Province,Peoples Republic of China,114005) (Associate Professor,Bowling Green State University,Ohio,U.S.A.43403—0249) | 1999 | 鞍山师范学院学报1999，1，2： | 0 |
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