The crystal structure of the title compound, 1,1 dichloro 3 dichloro 3 dichloromethyl 1a,3 diphenyl 1a,2,3,4 tetrahydro 1H azirino 1,2 a 1,5 benzodiazepine (C 23 H 18 Cl 4N 2, M r =4...The crystal structure of the title compound, 1,1 dichloro 3 dichloro 3 dichloromethyl 1a,3 diphenyl 1a,2,3,4 tetrahydro 1H azirino 1,2 a 1,5 benzodiazepine (C 23 H 18 Cl 4N 2, M r =464.22) was crystallized in triclinic, space group P 1, with cell dimensions a=9.621(7), b=9.694(9), c=12.669(6) , α=107.99(5)°, β=101.42(5)°, γ=69.94(6)°, V=1050.2(4) 3, Z=2, D c =1.468 g/cm 3 , Cu Kα(λ=1.5418 ). F(000)=1816, μ =2.44 mm -1 . The structure was solved by direct methods and refined by full matrix least squares method, and the final crystallographic discrepancy factor is 0.063 for 2555 observed reflections. The molecular backbone is a tricyclic system with the central seven membered 1,5 diazepine ring in twisted boat like conformation and cis fused to both aziridine ring and benzene ring.展开更多
The variation of carbon composition in undercooled austenite during bainitic incubation period has been investigated in 40CrMnSiMoVA by scanning auger microprobe (SAM). The results show that the outstanding diffusion ...The variation of carbon composition in undercooled austenite during bainitic incubation period has been investigated in 40CrMnSiMoVA by scanning auger microprobe (SAM). The results show that the outstanding diffusion and redistribution of carbon occur in isothermally reacted specimens. This leads to the formation of carbon-poor regions (CPR) near austenite grain boundaries and in austenite grains. The carbon content in CPR exceeds the equilibrium carbon composition of ferrite. Furthermore, it is indicated that the existence of CPR is thermodynamically possible.展开更多
The buckling and post-buckling of clamped circular plate subjected to distributed radial compressed load is presented by using the high-order perturbation analysis and shooting method. The sixth-order solution shows g...The buckling and post-buckling of clamped circular plate subjected to distributed radial compressed load is presented by using the high-order perturbation analysis and shooting method. The sixth-order solution shows good agreement with the FEM results in [11]. The results in this paper are applied to investigate the buckling and growth of pressed thin film delamination in the film/substrate system. Under a certain residual pressure in the thin film, two characteristic blister radii R(c) and R(g), the critical radius and growing radius respectively, are obtained. The numerical result shows that the growth criterion of delamination in [9,10] is not perfect. In variant residual stress or interface toughness, the conditions of no growth, stable growth and unstable growth of the delamination are obtained by comparing the driving force at the interface crack tip with the interface toughness.展开更多
The characteristics of molecular motion of ferroelectric copolymer VDF(73)/TrFE(27) have been investigated by means of dielectric relaxation. With the rise in crystallinity, the Curie point decreases and the dielectri...The characteristics of molecular motion of ferroelectric copolymer VDF(73)/TrFE(27) have been investigated by means of dielectric relaxation. With the rise in crystallinity, the Curie point decreases and the dielectric constant increases in the region of ferroelectric-to-paraelectric phase transition. The frequency spectra of the copolymer below room temperature consist of low-frequency component ascribed to the micro-Brownian motions of molecular segments in the noncrystalline regions and high-frequency component associated with the local motions of small-scale segments. By using the fitting results with one or two Cole-Cole functions, and calculating with WLF equation acid Arrhenius formula,the glass transition temperature and the activation energy of local relaxation are obtained. the distribution of relaxation time in the molten and ferroelectric phases is located at a Same line, acid complies with Arrhenius rule, which suggests that the elementary motions are of same type for molecular motions provided by the high-temperature process and the low-temperature local mode process.展开更多
An electrochemical cell was devised to investigate corrosion electrochemical behavior of metal underneath thin electrolyte film in atmosphere. The Piontelli's type of Luggin-Haber capillary was inserted from the b...An electrochemical cell was devised to investigate corrosion electrochemical behavior of metal underneath thin electrolyte film in atmosphere. The Piontelli's type of Luggin-Haber capillary was inserted from the backward of working electrode. The results show that. cathodic process on Cu is mainly affected by the thickness of the electrolyte film of 0.5 mol/L HCl+1 mol/LNa2SO4 aqueous solution and its anodic dissolution changed from Tafel region to limiting diffusion current. Moreover, the corrosion potential of Cu in due media will increase with decrease of the thickness of the film.展开更多
文摘The crystal structure of the title compound, 1,1 dichloro 3 dichloro 3 dichloromethyl 1a,3 diphenyl 1a,2,3,4 tetrahydro 1H azirino 1,2 a 1,5 benzodiazepine (C 23 H 18 Cl 4N 2, M r =464.22) was crystallized in triclinic, space group P 1, with cell dimensions a=9.621(7), b=9.694(9), c=12.669(6) , α=107.99(5)°, β=101.42(5)°, γ=69.94(6)°, V=1050.2(4) 3, Z=2, D c =1.468 g/cm 3 , Cu Kα(λ=1.5418 ). F(000)=1816, μ =2.44 mm -1 . The structure was solved by direct methods and refined by full matrix least squares method, and the final crystallographic discrepancy factor is 0.063 for 2555 observed reflections. The molecular backbone is a tricyclic system with the central seven membered 1,5 diazepine ring in twisted boat like conformation and cis fused to both aziridine ring and benzene ring.
文摘The variation of carbon composition in undercooled austenite during bainitic incubation period has been investigated in 40CrMnSiMoVA by scanning auger microprobe (SAM). The results show that the outstanding diffusion and redistribution of carbon occur in isothermally reacted specimens. This leads to the formation of carbon-poor regions (CPR) near austenite grain boundaries and in austenite grains. The carbon content in CPR exceeds the equilibrium carbon composition of ferrite. Furthermore, it is indicated that the existence of CPR is thermodynamically possible.
文摘The buckling and post-buckling of clamped circular plate subjected to distributed radial compressed load is presented by using the high-order perturbation analysis and shooting method. The sixth-order solution shows good agreement with the FEM results in [11]. The results in this paper are applied to investigate the buckling and growth of pressed thin film delamination in the film/substrate system. Under a certain residual pressure in the thin film, two characteristic blister radii R(c) and R(g), the critical radius and growing radius respectively, are obtained. The numerical result shows that the growth criterion of delamination in [9,10] is not perfect. In variant residual stress or interface toughness, the conditions of no growth, stable growth and unstable growth of the delamination are obtained by comparing the driving force at the interface crack tip with the interface toughness.
文摘The characteristics of molecular motion of ferroelectric copolymer VDF(73)/TrFE(27) have been investigated by means of dielectric relaxation. With the rise in crystallinity, the Curie point decreases and the dielectric constant increases in the region of ferroelectric-to-paraelectric phase transition. The frequency spectra of the copolymer below room temperature consist of low-frequency component ascribed to the micro-Brownian motions of molecular segments in the noncrystalline regions and high-frequency component associated with the local motions of small-scale segments. By using the fitting results with one or two Cole-Cole functions, and calculating with WLF equation acid Arrhenius formula,the glass transition temperature and the activation energy of local relaxation are obtained. the distribution of relaxation time in the molten and ferroelectric phases is located at a Same line, acid complies with Arrhenius rule, which suggests that the elementary motions are of same type for molecular motions provided by the high-temperature process and the low-temperature local mode process.
文摘An electrochemical cell was devised to investigate corrosion electrochemical behavior of metal underneath thin electrolyte film in atmosphere. The Piontelli's type of Luggin-Haber capillary was inserted from the backward of working electrode. The results show that. cathodic process on Cu is mainly affected by the thickness of the electrolyte film of 0.5 mol/L HCl+1 mol/LNa2SO4 aqueous solution and its anodic dissolution changed from Tafel region to limiting diffusion current. Moreover, the corrosion potential of Cu in due media will increase with decrease of the thickness of the film.
