Reactions of CuBr with equimolar PyHBr orγMePyHBr afforded two novel one dimensional bromocuprate?polymers{(PyH)_(3)[Cu_(3)Br_(6)]}_(∞)(1)and{(γMePyH)_(2)[Cu_(2)Br_(4)]}_(∞)(2),respectively.Both 1 and 2 were chara...Reactions of CuBr with equimolar PyHBr orγMePyHBr afforded two novel one dimensional bromocuprate?polymers{(PyH)_(3)[Cu_(3)Br_(6)]}_(∞)(1)and{(γMePyH)_(2)[Cu_(2)Br_(4)]}_(∞)(2),respectively.Both 1 and 2 were characterized by IR,elemental analysis,and X ray crystallography.Crystal data for 1:monoclinic,space group P2_(1)/n,a=0.93262(12)nm,b=1.3497(2)nm,c=1.9149(2)nm,β=93.465(7)°,V=2.4060(5)nm^(3),Z=4.Crystal data for 2:orthorhombic,space group Pbcm,a=0.8659(4)nm,b=1.5669(6)nm,c=1.2849(5)nm,V=1.7432(2)nm^(3),Z=4.The structure of 1 has a unique helical chain composed of units andμbromide anions while that of 2 shows a linear chain consisted of[Cu_(2)(μBr)_(2)]units bridged by pairs ofμBr atoms.CCDC:1,208412;2,208413.展开更多
Cross sections of the 10B(n,α)7Li reaction(including the total,the“leaking”alpha,forward alpha and backward alpha parts)at En=4.0 and 5.0 MeV were measured using an asymmetrical twin gridded ionization chamber and ...Cross sections of the 10B(n,α)7Li reaction(including the total,the“leaking”alpha,forward alpha and backward alpha parts)at En=4.0 and 5.0 MeV were measured using an asymmetrical twin gridded ionization chamber and two back−to-back 10B samples.Measurements were performed at the 4.5 MV Van de Graaff accelerator of Peking University.Monoenergetic neutrons were produced through the ^(2)H(d,n)3He reaction with a deuterium gas target.Absolute neutron flux was determined by a ^(238)U sample set inside the gridded ionization chamber and a BF_(3) long counter was employed as a neutron flux monitor and for normalization.The present results are compared with previous measurements and evaluations.展开更多
Cross sections of <sup>64</sup>（n,γ） <sup> </sup>（65）Zn reaction are measured in the energy range from 156to 1150 keV by the activation technique. The activities of the products are counte...Cross sections of <sup>64</sup>（n,γ） <sup> </sup>（65）Zn reaction are measured in the energy range from 156to 1150 keV by the activation technique. The activities of the products are counted with a highresolution HPGe γ-ray spectrometer. The neutron fluence is determined by <sup> </sup>（197）Au（n,γ） <sup> </sup>（198）Aucross section. Experimental activation cross sections are given for the first time. The errors ofthe measured results are 5%-8%.展开更多
Reaction of a preformed cluster [Et4N]4[Mo2O2S6Cu6I6] with bis（3,5-dimethylpyrazolyl）methane （dmpzm） in acetonitrile afforded the title compound [MoOS3Cu3I（dmpzm）2]·2（MeCN）0.5 1. The single-crystal X-ray ...Reaction of a preformed cluster [Et4N]4[Mo2O2S6Cu6I6] with bis（3,5-dimethylpyrazolyl）methane （dmpzm） in acetonitrile afforded the title compound [MoOS3Cu3I（dmpzm）2]·2（MeCN）0.5 1. The single-crystal X-ray diffraction study shows that 1 （C24H35Cu3IMoN9OS3, Mr = 975.25） crystallizes in triclinic, space group P1^- with a = 11.442（2）, b = 11.644（2）, c = 16.211（3） A, α = 99.26（3）, β= 102.22（3）, γ = 118.51（3）°, V = 1766.5（10） A^3, Z = 2, Dc = 1.834 g/cm^3, T = 193（2） K, F（000） = 960, μ = 32.12 cm^-1, λ = 0.71073A^3, R = 0.0355 and wR = 0.0915 for 5686 observed reflections with Ⅰ 〉 2σ（Ⅰ）. In the molecular structure of 1, the [MoOS3]^2- anion acts as a tridentate ligand to bind one CuI group and two [Cu（dmpzm）]^＋ units to form a nido-like [MoOS3Cu3] core with an approximate C2v symmetry. The Mo…Cu contacts are in the range of 2.6460（12）～2.6798（11）A.展开更多
Reaction of CuBr2 with TabHPF6/Et3N in methanol followed by dissolving the resulting precipitate in hydrobromic acid yielded purple blocks of the title complex [Tab-Tab][CuBr4] 1 （C18H26CuBraN2S2）. 1 crystallizes in...Reaction of CuBr2 with TabHPF6/Et3N in methanol followed by dissolving the resulting precipitate in hydrobromic acid yielded purple blocks of the title complex [Tab-Tab][CuBr4] 1 （C18H26CuBraN2S2）. 1 crystallizes in the monoclinic system, space group P2 1/n with a = 9.686（3）, b = 19.257（5）, c = 13.399（4） ,A, β= 93.610（9）°, V= 2494.2（13） ,A^3, Z= 4, Dc = 1.911 g/cm^3, T= 193（2） K, Mr = 717.71, F（000） = 1396,μ = 74.58 cm^-1, S = 1.126, R = 0.0748 and wR = 0.1736 for 2921 observed reflections with 1 〉 2σ（I）. The structure of 1 contains a discrete [CuBr4]^2- dianion and a [Tab-Tab]^2＋ dication. In the dianion, the Cu atom is coordinated to four Br atoms forming a distorted tetrahedral coordination geometry. The bromides of the dianion interact with the H atoms of the phenyl and methyl groups of the dications to form a 1D hydrogen-bonded chain.展开更多
Whole continuous a spectra of the p-^(11)B three-body sequential decay reaction have been measured by using a charge particle time-of-flight(TOF)spectrometer with the high-resolution passivated implanted planar silico...Whole continuous a spectra of the p-^(11)B three-body sequential decay reaction have been measured by using a charge particle time-of-flight(TOF)spectrometer with the high-resolution passivated implanted planar silicon detector.A characteristic shape of the saddle-type distribution was obtained.The Monte Carlo calculations show that observed a spectra can be interpreted by anisotropy sequential decay process of the intermediate nucleus ^(8)Be(1)for the p-^(11)B reaction.In the measurement,angular distributions were obtained for proton energies at 667 and 1370keV,respectively.Total cross-sections for the ^(11)B(p,α)^(8)Be(2α)reaction related to the clean fusion fuel were also reported at two bombarding energies.展开更多
High control performances cannot be obtained by most of the existing looper-tension control approaches through only considering controller designs based on continuous time models, which cannot meet the requirements of...High control performances cannot be obtained by most of the existing looper-tension control approaches through only considering controller designs based on continuous time models, which cannot meet the requirements of modern computer control systems with high control accuracy. In order to solve the above problems, a state feedback H∞ control method based on a discrete-time model for looper-tension control systems in hot rolling mills is presen- ted. The considered system is approximated by a discrete-time loope∞tension control system model. Based on a Lya- punov functional method, a state feedback H∞ control law is developed which makes the closed-loop system asymp totically stable with guaranteed H∞ performance. The controller gains are obtained by solving a set of linear matrix inequalities （LMIs）. In contrast to the existing results, the proposed approach can obtain good H∞ performance and effectively reduce external disturbances. The strip tension is also less affected by the change of looper angel, so good control performances can be obtained. Moreover, this control scheme is easy to implement, and can be applied to other linear systems. A simulation example with practical parameters is provided to illustrate the effectiveness of the developed method.展开更多
文摘Reactions of CuBr with equimolar PyHBr orγMePyHBr afforded two novel one dimensional bromocuprate?polymers{(PyH)_(3)[Cu_(3)Br_(6)]}_(∞)(1)and{(γMePyH)_(2)[Cu_(2)Br_(4)]}_(∞)(2),respectively.Both 1 and 2 were characterized by IR,elemental analysis,and X ray crystallography.Crystal data for 1:monoclinic,space group P2_(1)/n,a=0.93262(12)nm,b=1.3497(2)nm,c=1.9149(2)nm,β=93.465(7)°,V=2.4060(5)nm^(3),Z=4.Crystal data for 2:orthorhombic,space group Pbcm,a=0.8659(4)nm,b=1.5669(6)nm,c=1.2849(5)nm,V=1.7432(2)nm^(3),Z=4.The structure of 1 has a unique helical chain composed of units andμbromide anions while that of 2 shows a linear chain consisted of[Cu_(2)(μBr)_(2)]units bridged by pairs ofμBr atoms.CCDC:1,208412;2,208413.
基金by the National Natural Science Foundation of China under Grant No 10875006the National Basic Research Program of China under Grant No 2008CB717803China Nuclear Data Center and the Science and Technology on Nuclear Data Laboratory.
文摘Cross sections of the 10B(n,α)7Li reaction(including the total,the“leaking”alpha,forward alpha and backward alpha parts)at En=4.0 and 5.0 MeV were measured using an asymmetrical twin gridded ionization chamber and two back−to-back 10B samples.Measurements were performed at the 4.5 MV Van de Graaff accelerator of Peking University.Monoenergetic neutrons were produced through the ^(2)H(d,n)3He reaction with a deuterium gas target.Absolute neutron flux was determined by a ^(238)U sample set inside the gridded ionization chamber and a BF_(3) long counter was employed as a neutron flux monitor and for normalization.The present results are compared with previous measurements and evaluations.
基金The project supported by China National Nuclear Corporation
文摘Cross sections of <sup>64</sup>（n,γ） <sup> </sup>（65）Zn reaction are measured in the energy range from 156to 1150 keV by the activation technique. The activities of the products are counted with a highresolution HPGe γ-ray spectrometer. The neutron fluence is determined by <sup> </sup>（197）Au（n,γ） <sup> </sup>（198）Aucross section. Experimental activation cross sections are given for the first time. The errors ofthe measured results are 5%-8%.
基金This work was supported by the NSF of Jiangsu Province (No. BK2004205), the State Key Laboratory of Structural Chemistry (030066) and the Key Laboratory of Organic Synthesis of Jiangsu Province (No. JSK001).
文摘Reaction of a preformed cluster [Et4N]4[Mo2O2S6Cu6I6] with bis（3,5-dimethylpyrazolyl）methane （dmpzm） in acetonitrile afforded the title compound [MoOS3Cu3I（dmpzm）2]·2（MeCN）0.5 1. The single-crystal X-ray diffraction study shows that 1 （C24H35Cu3IMoN9OS3, Mr = 975.25） crystallizes in triclinic, space group P1^- with a = 11.442（2）, b = 11.644（2）, c = 16.211（3） A, α = 99.26（3）, β= 102.22（3）, γ = 118.51（3）°, V = 1766.5（10） A^3, Z = 2, Dc = 1.834 g/cm^3, T = 193（2） K, F（000） = 960, μ = 32.12 cm^-1, λ = 0.71073A^3, R = 0.0355 and wR = 0.0915 for 5686 observed reflections with Ⅰ 〉 2σ（Ⅰ）. In the molecular structure of 1, the [MoOS3]^2- anion acts as a tridentate ligand to bind one CuI group and two [Cu（dmpzm）]^＋ units to form a nido-like [MoOS3Cu3] core with an approximate C2v symmetry. The Mo…Cu contacts are in the range of 2.6460（12）～2.6798（11）A.
基金The project was supported by the National Natural Science Foundation of China (No. 20525101), the NSF of Jiangsu Province (No. BK2004205), State Key Laboratory of Structural Chemistry (No. 030066) and Key Laboratory of Organic Synthesis of Jiangsu Province (No. JSK001)
文摘Reaction of CuBr2 with TabHPF6/Et3N in methanol followed by dissolving the resulting precipitate in hydrobromic acid yielded purple blocks of the title complex [Tab-Tab][CuBr4] 1 （C18H26CuBraN2S2）. 1 crystallizes in the monoclinic system, space group P2 1/n with a = 9.686（3）, b = 19.257（5）, c = 13.399（4） ,A, β= 93.610（9）°, V= 2494.2（13） ,A^3, Z= 4, Dc = 1.911 g/cm^3, T= 193（2） K, Mr = 717.71, F（000） = 1396,μ = 74.58 cm^-1, S = 1.126, R = 0.0748 and wR = 0.1736 for 2921 observed reflections with 1 〉 2σ（I）. The structure of 1 contains a discrete [CuBr4]^2- dianion and a [Tab-Tab]^2＋ dication. In the dianion, the Cu atom is coordinated to four Br atoms forming a distorted tetrahedral coordination geometry. The bromides of the dianion interact with the H atoms of the phenyl and methyl groups of the dications to form a 1D hydrogen-bonded chain.
基金Supported in part by the National Natural Science Foundation of China under Grant Nos.19475006 and 19775065China National Nuclear Corporation.
文摘Whole continuous a spectra of the p-^(11)B three-body sequential decay reaction have been measured by using a charge particle time-of-flight(TOF)spectrometer with the high-resolution passivated implanted planar silicon detector.A characteristic shape of the saddle-type distribution was obtained.The Monte Carlo calculations show that observed a spectra can be interpreted by anisotropy sequential decay process of the intermediate nucleus ^(8)Be(1)for the p-^(11)B reaction.In the measurement,angular distributions were obtained for proton energies at 667 and 1370keV,respectively.Total cross-sections for the ^(11)B(p,α)^(8)Be(2α)reaction related to the clean fusion fuel were also reported at two bombarding energies.
基金Item Sponsored by National Natural Science Foundation of China(51374082)National High-Tech Research and Development Program(863Program)of China(2012AA050215)China Iron and Steel Research Foundation(12ZD0850A)
文摘High control performances cannot be obtained by most of the existing looper-tension control approaches through only considering controller designs based on continuous time models, which cannot meet the requirements of modern computer control systems with high control accuracy. In order to solve the above problems, a state feedback H∞ control method based on a discrete-time model for looper-tension control systems in hot rolling mills is presen- ted. The considered system is approximated by a discrete-time loope∞tension control system model. Based on a Lya- punov functional method, a state feedback H∞ control law is developed which makes the closed-loop system asymp totically stable with guaranteed H∞ performance. The controller gains are obtained by solving a set of linear matrix inequalities （LMIs）. In contrast to the existing results, the proposed approach can obtain good H∞ performance and effectively reduce external disturbances. The strip tension is also less affected by the change of looper angel, so good control performances can be obtained. Moreover, this control scheme is easy to implement, and can be applied to other linear systems. A simulation example with practical parameters is provided to illustrate the effectiveness of the developed method.
