Excited states of ^(206)Rn have been examined via the 197 Au(^(14)N,5n)^(206)Rn fusion reaction at a beam energy of 78 MeV.A number of transitions and levels are identified by the γ-γ coincidence measurement,further...Excited states of ^(206)Rn have been examined via the 197 Au(^(14)N,5n)^(206)Rn fusion reaction at a beam energy of 78 MeV.A number of transitions and levels are identified by the γ-γ coincidence measurement,further enriching the level scheme of ^(206)Rn.The fullconfiguration shell model and nucleon-pair approximation(NPA)were utilized to investigate the single-particle configurations and seniority structures in ^(206)Rn.The results of these two calculations suggest that 2_(1)^(+) and 4_(1)^(+) states exhibit only a 50%component of a seniority-two state associated with a broken neutron pair.The collectivity of these two states primarily arises from configuration mixing due to residual proton-neutron interactions.Furthermore,6_(1)^(+) and 8_(1)^(+) states are predominantly characterized by a seniority-two state marked by a broken proton pair.展开更多
文摘联合循环(Combined Cycle, CC)机组具有能源利用效率高、温室气体排放量低和运行方式灵活等特性,在电力系统中得到了越来越广泛的应用,积极参与到电力市场的竞价中。为了研究CC机组在日前电量市场中的竞价行为,文中提出了一种日前电量市场中CC机组竞价策略双层模型。上层模型为基于模式的CC机组竞价模型,下层模型为日前电量市场出清模型。该模型中的CC机组和独立系统运营商(Independent System Operator, ISO)通过电量市场出清得到的节点边际电价(Locational Marginal Prices, LMP)相互影响。CC机组向ISO提交报价同时影响电量市场的出清结果,并根据ISO进行的下层市场出清结果安排发电计划。利用Karush-Kuhn-Tucker(KKT)条件和对偶理论,将所提出的双层优化模型转化为均衡约束数学规划问题(Mathematical Program With Equilibrium Constraint, MPEC)。结果显示,文中所提出的竞价策略提高了CC机组在电量市场中的收益12.28%,降低市场的运行成本25.37%,验证了所提出模型的有效性。
基金Supported partially by the National Natural Science Foundation of China (10975191,U1867210,11375023,11475014,11575018,12075169,12322506)the National Key R&D program of China (2016YFA0400504)。
文摘Excited states of ^(206)Rn have been examined via the 197 Au(^(14)N,5n)^(206)Rn fusion reaction at a beam energy of 78 MeV.A number of transitions and levels are identified by the γ-γ coincidence measurement,further enriching the level scheme of ^(206)Rn.The fullconfiguration shell model and nucleon-pair approximation(NPA)were utilized to investigate the single-particle configurations and seniority structures in ^(206)Rn.The results of these two calculations suggest that 2_(1)^(+) and 4_(1)^(+) states exhibit only a 50%component of a seniority-two state associated with a broken neutron pair.The collectivity of these two states primarily arises from configuration mixing due to residual proton-neutron interactions.Furthermore,6_(1)^(+) and 8_(1)^(+) states are predominantly characterized by a seniority-two state marked by a broken proton pair.