We propose an ion-trap scheme for one-step generation of a special configuration of W-class state which has recently been shown to be better than canonical W states for several quantum-information processing tasks. We...We propose an ion-trap scheme for one-step generation of a special configuration of W-class state which has recently been shown to be better than canonical W states for several quantum-information processing tasks. We also present a method for one-step realization of a nontrivial collective operation which can transform a canonical W state into a fully separable state. Such a transformation plays a key role in recently proposed quantum protocols. The operation speed in our schemes increases with the number of qubits. This is contrary to usual entanglement generation and quantum manipulation schemes which take more and more time with the increase of the number of qubits.展开更多
The new chiral clusters [h5-C5H4C(NR)CH3]RuNiM(CO)5(m3-S) (R = NH-C6H3-2,4- (NO2)2, M = Mo, 3; M = W, 4) were synthesized and the structure of cluster 3 was determined by single-crystal X-ray analysis. Crystal data: C...The new chiral clusters [h5-C5H4C(NR)CH3]RuNiM(CO)5(m3-S) (R = NH-C6H3-2,4- (NO2)2, M = Mo, 3; M = W, 4) were synthesized and the structure of cluster 3 was determined by single-crystal X-ray analysis. Crystal data: C23H16O9N4MoNiRuS, Mr = 780.18, orthorhombic, space group Pbca with the following crystallographic parameters: a = 13.207(4), b = 16.036(5), c = 25.513(8) , Z = 8, V = 5403(3) 3, Dc = 1.918 g/cm3, m = 1.834 mm-1 and F(000) = 3072. The final R = 0.0512 and wR = 0.1132 for 2525 reflections with I > 2.00s(I).展开更多
The solubility of ammonium tungstate in a special hydrothermal condition is exploited to synthesize uniform microspheres of Ce-Cu-W-O oxides.Compared to their W-undoped counterparts,they possess more Ce^3+ and oxygen ...The solubility of ammonium tungstate in a special hydrothermal condition is exploited to synthesize uniform microspheres of Ce-Cu-W-O oxides.Compared to their W-undoped counterparts,they possess more Ce^3+ and oxygen vacancies,thereby promoting oxygen mobility.The formed rich WO3 surface can effectively provide acid sites,which is helpful for adsorption of vinyl chloride and interrupting the C-Cl bond.In addition,the presence of WO3 induces the formation of finer CuO nanoparticles with respect to the traditional coprecipitation method,thereby resulting in a better reducibility.Benefiting from both the enhanced acidity and reducibility,the Ce-Cu-W-O microspheres deliver excellent low-temperature vinyl chloride oxidation activity(a reaction rate of 2.01×10^-7 mol/(gcat·s)at 250℃)and high HCl selectivity.Moreover,subtle deactivation occurs after the three cycling activity tests,and a stable vinyl chloride conversion as well as mineralization are observed during the 72-h durability test at 300℃,which demonstrates good thermal stability.Our strategy can provide new insights into the design and synthesis of metal oxides for catalytic oxidation of chlorinated volatile organic compounds.展开更多
穿透硅通孔(Through Si via interconnect)是3D IC集成中的一种重要工艺。钨化学气相淀积在半导体工业中被广泛应用,其在接触孔/通孔填充中出色的台阶覆盖能力。但采用其作为填充金属时,会产生巨大的拉应力(tensile stress)。这是一种...穿透硅通孔(Through Si via interconnect)是3D IC集成中的一种重要工艺。钨化学气相淀积在半导体工业中被广泛应用,其在接触孔/通孔填充中出色的台阶覆盖能力。但采用其作为填充金属时,会产生巨大的拉应力(tensile stress)。这是一种钨淀积与刻蚀在同一反应腔内连续作业的填充高深宽比硅通孔工艺的方法。主要研究了反应腔压力、喷淋头与基座之间的距离、氩气流量主要工艺参数对钨刻蚀工艺的影响,最终获得了一种深硅通孔无缝填充的稳定工艺。展开更多
基金Supported by the Natural Science Foundation of Hunan Province under Grant No.06JJ50015
文摘We propose an ion-trap scheme for one-step generation of a special configuration of W-class state which has recently been shown to be better than canonical W states for several quantum-information processing tasks. We also present a method for one-step realization of a nontrivial collective operation which can transform a canonical W state into a fully separable state. Such a transformation plays a key role in recently proposed quantum protocols. The operation speed in our schemes increases with the number of qubits. This is contrary to usual entanglement generation and quantum manipulation schemes which take more and more time with the increase of the number of qubits.
基金This work was supported by the National Natural Science Foundation of China
文摘The new chiral clusters [h5-C5H4C(NR)CH3]RuNiM(CO)5(m3-S) (R = NH-C6H3-2,4- (NO2)2, M = Mo, 3; M = W, 4) were synthesized and the structure of cluster 3 was determined by single-crystal X-ray analysis. Crystal data: C23H16O9N4MoNiRuS, Mr = 780.18, orthorhombic, space group Pbca with the following crystallographic parameters: a = 13.207(4), b = 16.036(5), c = 25.513(8) , Z = 8, V = 5403(3) 3, Dc = 1.918 g/cm3, m = 1.834 mm-1 and F(000) = 3072. The final R = 0.0512 and wR = 0.1132 for 2525 reflections with I > 2.00s(I).
文摘The solubility of ammonium tungstate in a special hydrothermal condition is exploited to synthesize uniform microspheres of Ce-Cu-W-O oxides.Compared to their W-undoped counterparts,they possess more Ce^3+ and oxygen vacancies,thereby promoting oxygen mobility.The formed rich WO3 surface can effectively provide acid sites,which is helpful for adsorption of vinyl chloride and interrupting the C-Cl bond.In addition,the presence of WO3 induces the formation of finer CuO nanoparticles with respect to the traditional coprecipitation method,thereby resulting in a better reducibility.Benefiting from both the enhanced acidity and reducibility,the Ce-Cu-W-O microspheres deliver excellent low-temperature vinyl chloride oxidation activity(a reaction rate of 2.01×10^-7 mol/(gcat·s)at 250℃)and high HCl selectivity.Moreover,subtle deactivation occurs after the three cycling activity tests,and a stable vinyl chloride conversion as well as mineralization are observed during the 72-h durability test at 300℃,which demonstrates good thermal stability.Our strategy can provide new insights into the design and synthesis of metal oxides for catalytic oxidation of chlorinated volatile organic compounds.
文摘穿透硅通孔(Through Si via interconnect)是3D IC集成中的一种重要工艺。钨化学气相淀积在半导体工业中被广泛应用,其在接触孔/通孔填充中出色的台阶覆盖能力。但采用其作为填充金属时,会产生巨大的拉应力(tensile stress)。这是一种钨淀积与刻蚀在同一反应腔内连续作业的填充高深宽比硅通孔工艺的方法。主要研究了反应腔压力、喷淋头与基座之间的距离、氩气流量主要工艺参数对钨刻蚀工艺的影响,最终获得了一种深硅通孔无缝填充的稳定工艺。
