The self-assembly reactions of [MOS3]^2- （M = W, Mo） with CuS2COCH3 in DMF produced two novel dodecanuclear Mo（W）/Cu/S heterometallic clusters, [Et4N]4[{MOS3}3Cu6S2- （CuS2COCH3）3]·H2O （1： M = W; 2： M = M...The self-assembly reactions of [MOS3]^2- （M = W, Mo） with CuS2COCH3 in DMF produced two novel dodecanuclear Mo（W）/Cu/S heterometallic clusters, [Et4N]4[{MOS3}3Cu6S2- （CuS2COCH3）3]·H2O （1： M = W; 2： M = Mo）. Cluster 1 crystallizes in hexagonal, space group P-62c with a = 16.5612（3）, b = 16.5612（3）, c = 16.4660（5）A, Z = 2, V = 3911.13（16）A^3, Dc = 1.935 g/cm^3, μ（MoKα） = 7.269 mm^-1, F（000） = 2192, the final R = 0.0289 and wR = 0.0789 for 2425 observed reflections （I 〉 2σ（I））. Cluster 2 is isomorphous to 1 with similar crystal parameters. X-ray analysis reveals that both clusters consist of three incomplete cubane-like cluster units {MOS3Cu3S2COCH3}, which are linked together by two μ3-S atoms.展开更多
This paper presents the synthetic and structure studies of molybdenum（tungsten）-copper-sulphur-dialkyldithiocarbamate cluster compounds.The reactions of（M=Mo,W;n=0,2）,CuCl,and R<sub>2</sub>dtc￣-（R<...This paper presents the synthetic and structure studies of molybdenum（tungsten）-copper-sulphur-dialkyldithiocarbamate cluster compounds.The reactions of（M=Mo,W;n=0,2）,CuCl,and R<sub>2</sub>dtc￣-（R<sub>2</sub>=Me<sub>2</sub>,Et<sub>2</sub>,C<sub>4</sub>H<sub>8</sub>,C<sub>5</sub>H<sub>1</sub>0） yield a series of tetra-,hexa-,and heptanuclear cluster compounds.Their spectroscopic properties and the synthetic reaction mechanism are discussed.展开更多
Solvothermal reaction of [WS4]2-with CuCN and trithiocyanuric acid（L1） in orga-nic solvents gave rise to a new W/Cu/S polymer with a 2D anionic network,namely [Et4N]2[WS4Cu3（C3N3S3H1.5）2]（1）.The anionic layer of...Solvothermal reaction of [WS4]2-with CuCN and trithiocyanuric acid（L1） in orga-nic solvents gave rise to a new W/Cu/S polymer with a 2D anionic network,namely [Et4N]2[WS4Cu3（C3N3S3H1.5）2]（1）.The anionic layer of 1 is constructed by the T-shaped {WS4Cu3} subunits as nodes and L1 as linkers and features a（4,4） topology.Both 1 and its isomorphous compound [Et4N]2[MoS4Cu3（C3N3S3H1.5）2]（2） have been fully characterized by X-ray crystal analysis,IR and microanalyses.Compounds 1 and 2 show optical transitions with band gaps of 2.17 and 1.84 eV,respectively.展开更多
This paper compares the internal structures of the manufacturing industries in China and the U.S. from 1998 to 2005 and leads to three major discoveries: First, the gaps between China and the U.S.'s manufacturing ...This paper compares the internal structures of the manufacturing industries in China and the U.S. from 1998 to 2005 and leads to three major discoveries: First, the gaps between China and the U.S.'s manufacturing capacity have been narrowing at a high speed in the last seven years, during which the share of added value of China's manufacturing industry to that of the U.S. increased from 13% to 52%, and then reached 76% in 2007. Second, the labor force employed in China's manufacturing industry increased by 50%, of which the increase in capital and technology-intensive production sectors exceeded that in labor-intensive sectors. Meanwhile, the labor force employed in the U.S. manufacturing industry decreased. Third, labor productivity in China's manufacturing industry increased by 2.78 times, and profits increased by 2.21 times, much higher than the U.S. growth rates of 18.2% and 49.5%. Obviously, the narrowing gaps between China and the U.S.'s production capacities mean China's industrial progress and the hierarchy of world industrial powers will be rearranged.展开更多
On December 2015,a new restaurant opened next to the University of Arizona campus,in Tucson.Its name was“Illegal Pete’s”and it sold Mexican food.The presence of this establishment led to an intense backlash between...On December 2015,a new restaurant opened next to the University of Arizona campus,in Tucson.Its name was“Illegal Pete’s”and it sold Mexican food.The presence of this establishment led to an intense backlash between several University of Arizona students and the owner of the restaurant as they argued over the use of the world“illegal”.This paper reflects on the construction of“illegality”,its meaning and consequences on lived experiences.Drawing on Bakhtin’s analysis of words and his concepts of“single-voiced”and“double-voiced”discourses,I examine how the word“illegal”perpetuates and normalizes discrimination,criminalization,and racism towards Mexican-origin people and leads to feelings of anxious belonging.展开更多
Planck’s radiation law provides an equation for the intensity of the electromagnetic radiation from a physical body as a function of frequency and temperature. The frequency that corresponds to the maximum intensity ...Planck’s radiation law provides an equation for the intensity of the electromagnetic radiation from a physical body as a function of frequency and temperature. The frequency that corresponds to the maximum intensity is a function of temperature. At a specific temperature, for the frequencies correspond to much less than the maximum intensity, an equation was derived in the form of the Lambert <em>W</em> function. Numerical calculations validate the equation. A new form of solution for the Euler’s transcendental equation was derived in the form of the Lambert <em>W</em> function with logarithmic argument. Numerical solutions to the Euler’s equation were determined iteratively and iterative convergences were investigated. Numerical coincidences with physical constants were explored.展开更多
基金supported by CAS (SZD08002-2)973 Program (2007CB815306)+1 种基金the NNSFC (20733003 and 20673117)the Young Scientist’s Foundation of Fujian Province (2006F3136)
文摘The self-assembly reactions of [MOS3]^2- （M = W, Mo） with CuS2COCH3 in DMF produced two novel dodecanuclear Mo（W）/Cu/S heterometallic clusters, [Et4N]4[{MOS3}3Cu6S2- （CuS2COCH3）3]·H2O （1： M = W; 2： M = Mo）. Cluster 1 crystallizes in hexagonal, space group P-62c with a = 16.5612（3）, b = 16.5612（3）, c = 16.4660（5）A, Z = 2, V = 3911.13（16）A^3, Dc = 1.935 g/cm^3, μ（MoKα） = 7.269 mm^-1, F（000） = 2192, the final R = 0.0289 and wR = 0.0789 for 2425 observed reflections （I 〉 2σ（I））. Cluster 2 is isomorphous to 1 with similar crystal parameters. X-ray analysis reveals that both clusters consist of three incomplete cubane-like cluster units {MOS3Cu3S2COCH3}, which are linked together by two μ3-S atoms.
文摘This paper presents the synthetic and structure studies of molybdenum（tungsten）-copper-sulphur-dialkyldithiocarbamate cluster compounds.The reactions of（M=Mo,W;n=0,2）,CuCl,and R<sub>2</sub>dtc￣-（R<sub>2</sub>=Me<sub>2</sub>,Et<sub>2</sub>,C<sub>4</sub>H<sub>8</sub>,C<sub>5</sub>H<sub>1</sub>0） yield a series of tetra-,hexa-,and heptanuclear cluster compounds.Their spectroscopic properties and the synthetic reaction mechanism are discussed.
基金supported by the State Key Laboratory of Structural Chemistry (CAS,SZD08002-2)National Basic Research Program of China (973 Program,2007CB815306)+2 种基金the National Natural Science Foundation of China (20903096,20733003)Young Scientist’s Foundation of Fujian Province (2006F3163)Knowledge Innovation Program of the Chinese Academy of Sciences
文摘Solvothermal reaction of [WS4]2-with CuCN and trithiocyanuric acid（L1） in orga-nic solvents gave rise to a new W/Cu/S polymer with a 2D anionic network,namely [Et4N]2[WS4Cu3（C3N3S3H1.5）2]（1）.The anionic layer of 1 is constructed by the T-shaped {WS4Cu3} subunits as nodes and L1 as linkers and features a（4,4） topology.Both 1 and its isomorphous compound [Et4N]2[MoS4Cu3（C3N3S3H1.5）2]（2） have been fully characterized by X-ray crystal analysis,IR and microanalyses.Compounds 1 and 2 show optical transitions with band gaps of 2.17 and 1.84 eV,respectively.
基金sponsored by "Empirical Research Project on China's Industrial Innovation Strategies and Policy Options",which is a major project of a key humanities and social sciences research center of the Ministry of Educationfunded by the "regional" sub-project of China's International Economic Competitiveness Research and Innovation Center of Fudan University
文摘This paper compares the internal structures of the manufacturing industries in China and the U.S. from 1998 to 2005 and leads to three major discoveries: First, the gaps between China and the U.S.'s manufacturing capacity have been narrowing at a high speed in the last seven years, during which the share of added value of China's manufacturing industry to that of the U.S. increased from 13% to 52%, and then reached 76% in 2007. Second, the labor force employed in China's manufacturing industry increased by 50%, of which the increase in capital and technology-intensive production sectors exceeded that in labor-intensive sectors. Meanwhile, the labor force employed in the U.S. manufacturing industry decreased. Third, labor productivity in China's manufacturing industry increased by 2.78 times, and profits increased by 2.21 times, much higher than the U.S. growth rates of 18.2% and 49.5%. Obviously, the narrowing gaps between China and the U.S.'s production capacities mean China's industrial progress and the hierarchy of world industrial powers will be rearranged.
文摘On December 2015,a new restaurant opened next to the University of Arizona campus,in Tucson.Its name was“Illegal Pete’s”and it sold Mexican food.The presence of this establishment led to an intense backlash between several University of Arizona students and the owner of the restaurant as they argued over the use of the world“illegal”.This paper reflects on the construction of“illegality”,its meaning and consequences on lived experiences.Drawing on Bakhtin’s analysis of words and his concepts of“single-voiced”and“double-voiced”discourses,I examine how the word“illegal”perpetuates and normalizes discrimination,criminalization,and racism towards Mexican-origin people and leads to feelings of anxious belonging.
文摘Planck’s radiation law provides an equation for the intensity of the electromagnetic radiation from a physical body as a function of frequency and temperature. The frequency that corresponds to the maximum intensity is a function of temperature. At a specific temperature, for the frequencies correspond to much less than the maximum intensity, an equation was derived in the form of the Lambert <em>W</em> function. Numerical calculations validate the equation. A new form of solution for the Euler’s transcendental equation was derived in the form of the Lambert <em>W</em> function with logarithmic argument. Numerical solutions to the Euler’s equation were determined iteratively and iterative convergences were investigated. Numerical coincidences with physical constants were explored.
