The elimination of zig-zag defects in polyimide-coated surface-stabilized ferroelectric liquid crystal(SSFLC) cells is carried out by applying a low-frequency electric field. It has been achieved when the thickness of...The elimination of zig-zag defects in polyimide-coated surface-stabilized ferroelectric liquid crystal(SSFLC) cells is carried out by applying a low-frequency electric field. It has been achieved when the thickness of SSFLC cell is 3 μm. The optical spectral transmittance measurement confirmed that there is no change of layer structure, and the memory capability was not improved. The different effects of low-frequency electric field applied on the different thickness FLC cells have been observed, and experimental results were presented.展开更多
The band structures of a new two-dimensional triangle-shaped array geometry of 4340 steel cylinders of square cross section in an epoxy resin were studied by the plane-wave expansion and supercell calculation method. ...The band structures of a new two-dimensional triangle-shaped array geometry of 4340 steel cylinders of square cross section in an epoxy resin were studied by the plane-wave expansion and supercell calculation method. The band gaps of this type of phononic crystals with different defects were calculated such as defect-free, 60° crystal linear defect states, 120° crystal linear defect states, and 180° crystal linear defect states. It was found that the band gap will emerge in different linear defects of the phononic crystals and the bandwidth of linear defect states is larger than that of the free-defect crystal by about 2.14 times within the filling fraction F = 0.1-0.85. In addition, the influence of the filling fraction on the relative width of the minimum band gap is discussed.展开更多
目的应用高通量测序的染色体组拷贝数分析技术分析先天性心脏病胎儿基因组拷贝数变异(copy number variation,CNV),初步探讨高通量测序技术在胎儿先心病中的应用价值。方法对超声发现胎儿先天性心脏病患者进行脐血染色体检查,对于染色...目的应用高通量测序的染色体组拷贝数分析技术分析先天性心脏病胎儿基因组拷贝数变异(copy number variation,CNV),初步探讨高通量测序技术在胎儿先心病中的应用价值。方法对超声发现胎儿先天性心脏病患者进行脐血染色体检查,对于染色体核型正常者进而行高通量测序基因组拷贝数分析,相关CNV到相应数据库查找分析。结果共检测先心病胎儿28例:染色体异常者7例;染色体核型正常者21例。正常者中10例行高通量测序基因组拷贝数分析,未发现拷贝数变异者2例;有CNV改变的占8例,能检测到13处250 kb^13M染色体片段的CNV。其中4处存在临床意义不明确的CNV。结论高通量测序技术用于先天性心脏病遗传分析是可行的,所检测的CNV变异可以作为胎儿先心病遗传学数据的积累。展开更多
文摘The elimination of zig-zag defects in polyimide-coated surface-stabilized ferroelectric liquid crystal(SSFLC) cells is carried out by applying a low-frequency electric field. It has been achieved when the thickness of SSFLC cell is 3 μm. The optical spectral transmittance measurement confirmed that there is no change of layer structure, and the memory capability was not improved. The different effects of low-frequency electric field applied on the different thickness FLC cells have been observed, and experimental results were presented.
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 10764005 and 11164034)the New Century Training Program Foundation for Talents from the Ministry of Education of China (Grant No. NCET-08-0926)
文摘The band structures of a new two-dimensional triangle-shaped array geometry of 4340 steel cylinders of square cross section in an epoxy resin were studied by the plane-wave expansion and supercell calculation method. The band gaps of this type of phononic crystals with different defects were calculated such as defect-free, 60° crystal linear defect states, 120° crystal linear defect states, and 180° crystal linear defect states. It was found that the band gap will emerge in different linear defects of the phononic crystals and the bandwidth of linear defect states is larger than that of the free-defect crystal by about 2.14 times within the filling fraction F = 0.1-0.85. In addition, the influence of the filling fraction on the relative width of the minimum band gap is discussed.
文摘目的应用高通量测序的染色体组拷贝数分析技术分析先天性心脏病胎儿基因组拷贝数变异(copy number variation,CNV),初步探讨高通量测序技术在胎儿先心病中的应用价值。方法对超声发现胎儿先天性心脏病患者进行脐血染色体检查,对于染色体核型正常者进而行高通量测序基因组拷贝数分析,相关CNV到相应数据库查找分析。结果共检测先心病胎儿28例:染色体异常者7例;染色体核型正常者21例。正常者中10例行高通量测序基因组拷贝数分析,未发现拷贝数变异者2例;有CNV改变的占8例,能检测到13处250 kb^13M染色体片段的CNV。其中4处存在临床意义不明确的CNV。结论高通量测序技术用于先天性心脏病遗传分析是可行的,所检测的CNV变异可以作为胎儿先心病遗传学数据的积累。
