The title complex [NH4]n [WAgS4]n crystallizes in the tetragonalspace group I4 with crystallographic parameters: a = b = 7. 994 (2 ), c = 5. 855 (2 ):A,V = 373. g(2) A3, Z=2, Dc= 3. 89 g/cm3, F(000) = 392, μ= 19. 27 ...The title complex [NH4]n [WAgS4]n crystallizes in the tetragonalspace group I4 with crystallographic parameters: a = b = 7. 994 (2 ), c = 5. 855 (2 ):A,V = 373. g(2) A3, Z=2, Dc= 3. 89 g/cm3, F(000) = 392, μ= 19. 27 mm-l , A(MoKα) = 0. 71069, Mr = 438. 01, and the convergence factors R = 0. 045, Rw =0. 055 for 341 observed reflections (I>3σ(I)). The anion structure can be viewed as apolymeric single chain consisting of unlimited extended rhombic fragruents of -AgS2W-which are alternately perpendicular to each other. Additionally, influence of di- and tri-valent complex cations on the assembIy of WS2-4 and Ag+ is briefly discussed.展开更多
激光引信以体积小、分辨率高等优势,广泛应用于弹药领域,其动态探测能力决定毁伤效能。当前激光探测已经从单点探测转向线阵扫描开展,但仿真研究多限于单一场景,动态模拟能力和实时计算效率不足,为此提出动态扫描探测模型、多材质散射...激光引信以体积小、分辨率高等优势,广泛应用于弹药领域,其动态探测能力决定毁伤效能。当前激光探测已经从单点探测转向线阵扫描开展,但仿真研究多限于单一场景,动态模拟能力和实时计算效率不足,为此提出动态扫描探测模型、多材质散射模型与高效并行计算方法,并基于此设计全链路激光线阵成像仿真系统。通过建立激光线阵推扫模型和弹目交会模型,实现弹目动态交会场景下推扫成像;构建迷彩涂层、沙漠等多目标双向反射分布函数(Bidirectional Reflectance Distribution Function,BRDF)散射模型,基于实验数据标定关键参数,有效降低BRDF平均误差;为实现对动态弹目交会场景的高效仿真,在前述动态扫描探测模型与多材质散射模型的基础上设计并行计算架构,通过采用图形处理器和包围盒层次结构结合方法,优化光线与场景面元相交判断逻辑,提高面元场景的仿真效率。新方法在不同地面背景下的回波功率仿真结果与BRDF背景关系一致,体现了模型的准确性。展开更多
A multi-nucleon transfer and cluster decay experiment,^(7)Li(^(11)B,^(14)C^(*)→α+^(10)Be)α,is conducted at an incident beam energy of 55 MeV.This reaction channel has a significantly large 0-value,which favors popu...A multi-nucleon transfer and cluster decay experiment,^(7)Li(^(11)B,^(14)C^(*)→α+^(10)Be)α,is conducted at an incident beam energy of 55 MeV.This reaction channel has a significantly large 0-value,which favors populating the high lying resonant states in ^(14)C.The decay paths,from these resonances to various states of the final nucleus ^(10) Be,can be selected,owing to the experimentally achieved optimal resolution of the Q-value spectrum.A number of resonant states are reconstructed from the forward emitting 10Be+α fragments,and their major molecular structures can be detected according to the selective decay paths and relative decay widths.A state at 22.4(2)MeV validates the previously measured and theoretically predicted band head of the positive-parity σ-bond linear-chain mo-lecular band.Two additional resonances at 22.9(2)and 24.2(2)MeV are identified and consistent with the predicted 2^(+) and 4^(+) members of the same molecular band,thus providing novel evidences for the existence of the exotic clustering chain structure in neutron-rich carbon isotopes.A few high energy resonances,which also indicate the presence of the σ-bond molecular structure,are observed;however,further studies are still required to clarify their ascription in band systematics.展开更多
文摘The title complex [NH4]n [WAgS4]n crystallizes in the tetragonalspace group I4 with crystallographic parameters: a = b = 7. 994 (2 ), c = 5. 855 (2 ):A,V = 373. g(2) A3, Z=2, Dc= 3. 89 g/cm3, F(000) = 392, μ= 19. 27 mm-l , A(MoKα) = 0. 71069, Mr = 438. 01, and the convergence factors R = 0. 045, Rw =0. 055 for 341 observed reflections (I>3σ(I)). The anion structure can be viewed as apolymeric single chain consisting of unlimited extended rhombic fragruents of -AgS2W-which are alternately perpendicular to each other. Additionally, influence of di- and tri-valent complex cations on the assembIy of WS2-4 and Ag+ is briefly discussed.
文摘激光引信以体积小、分辨率高等优势,广泛应用于弹药领域,其动态探测能力决定毁伤效能。当前激光探测已经从单点探测转向线阵扫描开展,但仿真研究多限于单一场景,动态模拟能力和实时计算效率不足,为此提出动态扫描探测模型、多材质散射模型与高效并行计算方法,并基于此设计全链路激光线阵成像仿真系统。通过建立激光线阵推扫模型和弹目交会模型,实现弹目动态交会场景下推扫成像;构建迷彩涂层、沙漠等多目标双向反射分布函数(Bidirectional Reflectance Distribution Function,BRDF)散射模型,基于实验数据标定关键参数,有效降低BRDF平均误差;为实现对动态弹目交会场景的高效仿真,在前述动态扫描探测模型与多材质散射模型的基础上设计并行计算架构,通过采用图形处理器和包围盒层次结构结合方法,优化光线与场景面元相交判断逻辑,提高面元场景的仿真效率。新方法在不同地面背景下的回波功率仿真结果与BRDF背景关系一致,体现了模型的准确性。
基金Supported by the National Key research and development Program of China(2018YFA0404403)the National Natural Science Foundation of China(11875074,11875073,12027809,11635015,11961141003)the Continuous Basic Scientific Research Project(WDJC-2019-13)。
文摘A multi-nucleon transfer and cluster decay experiment,^(7)Li(^(11)B,^(14)C^(*)→α+^(10)Be)α,is conducted at an incident beam energy of 55 MeV.This reaction channel has a significantly large 0-value,which favors populating the high lying resonant states in ^(14)C.The decay paths,from these resonances to various states of the final nucleus ^(10) Be,can be selected,owing to the experimentally achieved optimal resolution of the Q-value spectrum.A number of resonant states are reconstructed from the forward emitting 10Be+α fragments,and their major molecular structures can be detected according to the selective decay paths and relative decay widths.A state at 22.4(2)MeV validates the previously measured and theoretically predicted band head of the positive-parity σ-bond linear-chain mo-lecular band.Two additional resonances at 22.9(2)and 24.2(2)MeV are identified and consistent with the predicted 2^(+) and 4^(+) members of the same molecular band,thus providing novel evidences for the existence of the exotic clustering chain structure in neutron-rich carbon isotopes.A few high energy resonances,which also indicate the presence of the σ-bond molecular structure,are observed;however,further studies are still required to clarify their ascription in band systematics.
