在光无线通信系统中,调制与解调技术是其中关键部分。在常用的调制解调技术中,脉冲位置调制(PPM)技术具有良好的传输性能、比较好的抗干扰能力。在深入研究脉冲位置调制(PPM)技术的原理后,为了进一步提高系统的传输能力和抗干扰能力,提...在光无线通信系统中,调制与解调技术是其中关键部分。在常用的调制解调技术中,脉冲位置调制(PPM)技术具有良好的传输性能、比较好的抗干扰能力。在深入研究脉冲位置调制(PPM)技术的原理后,为了进一步提高系统的传输能力和抗干扰能力,提出了在脉冲位置调制(PPM)技术基础上的改进方案,即差分脉冲调制(DPPM)技术。使用ALTERA公司生产的CYCLONE IV系列的FPGA作为编程芯片,使用Verilog HDL语言在Quartus II 11.0软件上编写程序。展开更多
The heterotrinuclear compound [PdCu2(tdt)(μ-dppm)2(MeCN)4](ClO4)2?2/3H2O 1 (tdt = 3,4-toluenedithiolate, dppm = bis(diphenylphosphino)methane) has been prepared and characterized by X-ray structural analysis. Compoun...The heterotrinuclear compound [PdCu2(tdt)(μ-dppm)2(MeCN)4](ClO4)2?2/3H2O 1 (tdt = 3,4-toluenedithiolate, dppm = bis(diphenylphosphino)methane) has been prepared and characterized by X-ray structural analysis. Compound 1 crystallizes in trigonal system, space group R3c with a = b = 34.4275(3), c = 32.6700(5) ?, V = 33534.4(7) ?3, Mr = 1527.21, Z = 18, Dc = 1.361 g/cm3, F(000) = 13974, μ(MoKα) = 1.069 mm-1, the final R = 0.0703 and wR = 0.1389 for 8375 observed reflections with I>2σ(I). The dithiolate tdt displays a chelating and bridging coordination mode, which chelates a PdII and bridges two Cu? atoms. The PdII center is located in an approximate square-planar environment with S2P2 donors, and each Cu? center exhibits a tetrahedral geometry.展开更多
The silver-dppm complex, [Ag2（dppm）2（NMP）2]（SbF6）2-4H2O-3CH2Cl2 1 （NMP = 2- （4-dimethylaminophenyl）imidazo（4,5-f）（1,10）phenanthroline, dppm = diphenylphosphinomethane）, was synthesized and its structure ...The silver-dppm complex, [Ag2（dppm）2（NMP）2]（SbF6）2-4H2O-3CH2Cl2 1 （NMP = 2- （4-dimethylaminophenyl）imidazo（4,5-f）（1,10）phenanthroline, dppm = diphenylphosphinomethane）, was synthesized and its structure was determined by X-ray diffraction. The crystal belongs to monoclinic, space group C2/c, Mr = 2461.61, a = 21.57（10）, b = 22.48（6）, c = 22.53（6）A, β= 101.29（2）°, V= 10713（64）A^3, Z= 4, Dc= 1.526 g/cm^3,μ= 1.141mm^-1, F（000） = 4920, R =0.0664 and wR = 0.1774 for 8524 observed reflections （1 〉 2σ（I））. Complex 1 exists as a centrosymmetric dimmer. The two dppm molecules bridge two AgNMP moieties to form an eight-membered Ag2P4C2 metallacyclic ring with ligand NMP chelating to each Ag. It appears photoluminescence （λmax = 625 nm） at room temperature and makes red shift compared with free ligand NMP （λmax = 522 nm）. DFF calculation indicates that the emission of 1 originates from singlet metal-perturbed ILCT excited state.展开更多
Two binuclear copper(I) complexes with novel structures and novel bonding,Cu_2(Ph_2PCH_2PPh_2)Cl_2 (Ph_2PCH_2PPh_2=dppm) and Cu_2(Ph_2P-CH_2CH_2PPh_2)Cl_2 (Ph_2PCH_2CH_2PPh_2=dppe), were prepared and characterized thr...Two binuclear copper(I) complexes with novel structures and novel bonding,Cu_2(Ph_2PCH_2PPh_2)Cl_2 (Ph_2PCH_2PPh_2=dppm) and Cu_2(Ph_2P-CH_2CH_2PPh_2)Cl_2 (Ph_2PCH_2CH_2PPh_2=dppe), were prepared and characterized through elemental analyses, ICP, IR(4000-200 cm^(-1), CsI disc.), ^(31)P-NMR spectra. Their electronic conductivities, oxidation and reduction potentials were measured. Preliminary studies show that both of the two complexes have chlorobridging and phosphorus-bridging structures.展开更多
3D NAND中工艺结构是导致器件失效的重要因素之一,其中,选择性外延生长(SEG)的生长高度也是导致失效的一个重要参数。因此,提出了一种新的关于SEG高度引起器件失效的模型、失效概率的计算方法,并由此计算预测每百万缺陷数(DPPM)。该算...3D NAND中工艺结构是导致器件失效的重要因素之一,其中,选择性外延生长(SEG)的生长高度也是导致失效的一个重要参数。因此,提出了一种新的关于SEG高度引起器件失效的模型、失效概率的计算方法,并由此计算预测每百万缺陷数(DPPM)。该算法涉及多种数学模型如泊松分布、正态分布等,同时对3D NAND中不同层次的失效概率进行计算。根据该算法可以得到DPPM与SEG高度的关系,并对SEG高度最优值、DPPM对不同区域的SEG高度的敏感性进行了研究。展开更多
It is acknowledged that diphenylphosphinomethane （dppm=ph<sub>2</sub>PCH<sub>2</sub>Pph<sub>2</sub>）is a phosphine ligand which is inclined to form polynuclear metal complexes by ...It is acknowledged that diphenylphosphinomethane （dppm=ph<sub>2</sub>PCH<sub>2</sub>Pph<sub>2</sub>）is a phosphine ligand which is inclined to form polynuclear metal complexes by reacting with metal ions. The title complex was prepared by adding 1 mmol dppm and 1 mmol AgClO<sub>4</sub> to pyridine with stirring. The solution was allowed to evaporate for an week, and it gave展开更多
文摘在光无线通信系统中,调制与解调技术是其中关键部分。在常用的调制解调技术中,脉冲位置调制(PPM)技术具有良好的传输性能、比较好的抗干扰能力。在深入研究脉冲位置调制(PPM)技术的原理后,为了进一步提高系统的传输能力和抗干扰能力,提出了在脉冲位置调制(PPM)技术基础上的改进方案,即差分脉冲调制(DPPM)技术。使用ALTERA公司生产的CYCLONE IV系列的FPGA作为编程芯片,使用Verilog HDL语言在Quartus II 11.0软件上编写程序。
基金This work was supported by NSF of Fujian Province (E0310029 and E0420002)
文摘The heterotrinuclear compound [PdCu2(tdt)(μ-dppm)2(MeCN)4](ClO4)2?2/3H2O 1 (tdt = 3,4-toluenedithiolate, dppm = bis(diphenylphosphino)methane) has been prepared and characterized by X-ray structural analysis. Compound 1 crystallizes in trigonal system, space group R3c with a = b = 34.4275(3), c = 32.6700(5) ?, V = 33534.4(7) ?3, Mr = 1527.21, Z = 18, Dc = 1.361 g/cm3, F(000) = 13974, μ(MoKα) = 1.069 mm-1, the final R = 0.0703 and wR = 0.1389 for 8375 observed reflections with I>2σ(I). The dithiolate tdt displays a chelating and bridging coordination mode, which chelates a PdII and bridges two Cu? atoms. The PdII center is located in an approximate square-planar environment with S2P2 donors, and each Cu? center exhibits a tetrahedral geometry.
基金This work was support by National Basic Research Program of China (No: 2004CB720605) and the Natural Science Foundation of China (No. 20173064 and 90203017).
文摘The silver-dppm complex, [Ag2（dppm）2（NMP）2]（SbF6）2-4H2O-3CH2Cl2 1 （NMP = 2- （4-dimethylaminophenyl）imidazo（4,5-f）（1,10）phenanthroline, dppm = diphenylphosphinomethane）, was synthesized and its structure was determined by X-ray diffraction. The crystal belongs to monoclinic, space group C2/c, Mr = 2461.61, a = 21.57（10）, b = 22.48（6）, c = 22.53（6）A, β= 101.29（2）°, V= 10713（64）A^3, Z= 4, Dc= 1.526 g/cm^3,μ= 1.141mm^-1, F（000） = 4920, R =0.0664 and wR = 0.1774 for 8524 observed reflections （1 〉 2σ（I））. Complex 1 exists as a centrosymmetric dimmer. The two dppm molecules bridge two AgNMP moieties to form an eight-membered Ag2P4C2 metallacyclic ring with ligand NMP chelating to each Ag. It appears photoluminescence （λmax = 625 nm） at room temperature and makes red shift compared with free ligand NMP （λmax = 522 nm）. DFF calculation indicates that the emission of 1 originates from singlet metal-perturbed ILCT excited state.
文摘Two binuclear copper(I) complexes with novel structures and novel bonding,Cu_2(Ph_2PCH_2PPh_2)Cl_2 (Ph_2PCH_2PPh_2=dppm) and Cu_2(Ph_2P-CH_2CH_2PPh_2)Cl_2 (Ph_2PCH_2CH_2PPh_2=dppe), were prepared and characterized through elemental analyses, ICP, IR(4000-200 cm^(-1), CsI disc.), ^(31)P-NMR spectra. Their electronic conductivities, oxidation and reduction potentials were measured. Preliminary studies show that both of the two complexes have chlorobridging and phosphorus-bridging structures.
文摘It is acknowledged that diphenylphosphinomethane （dppm=ph<sub>2</sub>PCH<sub>2</sub>Pph<sub>2</sub>）is a phosphine ligand which is inclined to form polynuclear metal complexes by reacting with metal ions. The title complex was prepared by adding 1 mmol dppm and 1 mmol AgClO<sub>4</sub> to pyridine with stirring. The solution was allowed to evaporate for an week, and it gave
