We propose and investigate a novel metal/SiO_2/Si_3N_4/SiO_2/SiGe charge trapping flash memory structure（named as MONOS）, utilizing Si Ge as the buried channel. The fabricated memory device demonstrates excellent pr...We propose and investigate a novel metal/SiO_2/Si_3N_4/SiO_2/SiGe charge trapping flash memory structure（named as MONOS）, utilizing Si Ge as the buried channel. The fabricated memory device demonstrates excellent programerasable characteristics attributed to the fact that more carriers are generated by the smaller bandgap of Si Ge during program/erase operations. A flat-band voltage shift 2.8 V can be obtained by programming at ＋11 V for 100 us. Meanwhile, the memory device exhibits a large memory window of ~7.17 V under ±12 V sweeping voltage, and a negligible charge loss of 18% after 104 s＇ retention. In addition, the leakage current density is lower than 2.52 × 10^（-7） A·cm^（-2） below a gate breakdown voltage of 12.5 V. Investigation of leakage current-voltage indicates that the Schottky emission is the predominant conduction mechanisms for leakage current. These desirable characteristics are ascribed to the higher trap density of the Si_3N_4 charge trapping layer and the better quality of the interface between the SiO_2 tunneling layer and the Si Ge buried channel. Therefore, the application of the Si Ge buried channel is very promising to construct 3 D charge trapping NAND flash devices with improved operation characteristics.展开更多
The monosized macroporous-polymer beads based on cross-linked poly(glycidylmethacrylate) have been synthesized by a new improving method-combining dispersionpolymerization with swelling polymerization and polymeric so...The monosized macroporous-polymer beads based on cross-linked poly(glycidylmethacrylate) have been synthesized by a new improving method-combining dispersionpolymerization with swelling polymerization and polymeric solution porogens. The structure and gel chromatographic properties of the resins have been studied. The resins as matrix materials of various types of high performance liquid chromatography (HPLC) packings possess excellent separation展开更多
Monosize, 1.6 μm, magnetic beads of poly（glycidyl methacrylate） [M-poly（GMA）], were prepared by dispersion polymerization in the presence of Fe3O4 nano-powder. Monosize M-poly（GMA） beads were characterized by s...Monosize, 1.6 μm, magnetic beads of poly（glycidyl methacrylate） [M-poly（GMA）], were prepared by dispersion polymerization in the presence of Fe3O4 nano-powder. Monosize M-poly（GMA） beads were characterized by swelling tests, density measurements, electron spin resonance （ESR）, vibrating sample magnetometer （VSM） and scanning electron microscopy （SEM）. The characteristic functional groups of M-poly（GMA） beads were analyzed by Fourier transform infrared spectrometer （FTIR）. The M-poly（GMA） beads are highly uniform in size and have a spherical shape and non-porous structure. Polydispersity index （PDI） of M-poly（GMA） beads was calculated to be around 1.008. The hydrated density of the M-poly（GMA） beads measured at 25 ℃ was 1.14 g/cm^3. The content of oxirane groups on the surface of the M-poly（GMA） sample was found to be 3.46 mmol/g by using perchloric acid titration. The specific surface area of the M-poly（GMA） beads was determined to be 3.2 m^2/g. The equilibrium swelling ratio was 52%. The volume fraction of magnetite nanopowder in the M-poly（GMA） beads was found to be 4.5%. The g factor, that can be considered as a quantity characteristic of the molecules in which the unpaired electrons are located, was found to be 2.28 for M-poly（GMA）. The external magnetic field at resonance was calculated to be 2055 Gs which was found sufficient to excite all of the dipole moments present in 1.0 g of M-poly（GMA） sample.展开更多
建立了同时测定糖苷类表面活性剂产品中单糖和多糖含量的高效液相色谱法。采用Zorbax Eclipse Plus C_(18)色谱柱(4.6mm×100mm,3.5μm)分离,甲醇-水梯度洗脱,流速1.0 mL/min,蒸发光散射检测器检测。用葡萄糖和麦芽三糖为对照品,外...建立了同时测定糖苷类表面活性剂产品中单糖和多糖含量的高效液相色谱法。采用Zorbax Eclipse Plus C_(18)色谱柱(4.6mm×100mm,3.5μm)分离,甲醇-水梯度洗脱,流速1.0 mL/min,蒸发光散射检测器检测。用葡萄糖和麦芽三糖为对照品,外标两点法同时测定糖苷产品中单糖和多糖的含量。结果表明,单糖和多糖的检出限分别约为1.5和2.0μg/L,回收率分别为100.4%和99.1%。与既有方法相比,此方法可以同时分析产品中残留原料糖和副产物多糖的含量,且在分析非还原性单糖方面具有独特优势。展开更多
The perturbations of ATP on oscillatory reactions of monose (fructose or glucose)-acetone-Mn 2+ -BrO - 3-H 2SO 4 systems were investigated. The experimental results show that the induced times and periods of the oscil...The perturbations of ATP on oscillatory reactions of monose (fructose or glucose)-acetone-Mn 2+ -BrO - 3-H 2SO 4 systems were investigated. The experimental results show that the induced times and periods of the oscillating reactions are increased with ATP concentration. The kinetics behaviour of the pertubation is explained by FKN mechanism.展开更多
基金Supported by the National Science and Technology Major Project of China under Grant No 2013ZX02303007the National Key Research and Development Program of China under Grant No 2016YFA0301701the Youth Innovation Promotion Association of the Chinese Academy of Sciences under Grant No 2016112
文摘We propose and investigate a novel metal/SiO_2/Si_3N_4/SiO_2/SiGe charge trapping flash memory structure（named as MONOS）, utilizing Si Ge as the buried channel. The fabricated memory device demonstrates excellent programerasable characteristics attributed to the fact that more carriers are generated by the smaller bandgap of Si Ge during program/erase operations. A flat-band voltage shift 2.8 V can be obtained by programming at ＋11 V for 100 us. Meanwhile, the memory device exhibits a large memory window of ~7.17 V under ±12 V sweeping voltage, and a negligible charge loss of 18% after 104 s＇ retention. In addition, the leakage current density is lower than 2.52 × 10^（-7） A·cm^（-2） below a gate breakdown voltage of 12.5 V. Investigation of leakage current-voltage indicates that the Schottky emission is the predominant conduction mechanisms for leakage current. These desirable characteristics are ascribed to the higher trap density of the Si_3N_4 charge trapping layer and the better quality of the interface between the SiO_2 tunneling layer and the Si Ge buried channel. Therefore, the application of the Si Ge buried channel is very promising to construct 3 D charge trapping NAND flash devices with improved operation characteristics.
文摘The monosized macroporous-polymer beads based on cross-linked poly(glycidylmethacrylate) have been synthesized by a new improving method-combining dispersionpolymerization with swelling polymerization and polymeric solution porogens. The structure and gel chromatographic properties of the resins have been studied. The resins as matrix materials of various types of high performance liquid chromatography (HPLC) packings possess excellent separation
文摘Monosize, 1.6 μm, magnetic beads of poly（glycidyl methacrylate） [M-poly（GMA）], were prepared by dispersion polymerization in the presence of Fe3O4 nano-powder. Monosize M-poly（GMA） beads were characterized by swelling tests, density measurements, electron spin resonance （ESR）, vibrating sample magnetometer （VSM） and scanning electron microscopy （SEM）. The characteristic functional groups of M-poly（GMA） beads were analyzed by Fourier transform infrared spectrometer （FTIR）. The M-poly（GMA） beads are highly uniform in size and have a spherical shape and non-porous structure. Polydispersity index （PDI） of M-poly（GMA） beads was calculated to be around 1.008. The hydrated density of the M-poly（GMA） beads measured at 25 ℃ was 1.14 g/cm^3. The content of oxirane groups on the surface of the M-poly（GMA） sample was found to be 3.46 mmol/g by using perchloric acid titration. The specific surface area of the M-poly（GMA） beads was determined to be 3.2 m^2/g. The equilibrium swelling ratio was 52%. The volume fraction of magnetite nanopowder in the M-poly（GMA） beads was found to be 4.5%. The g factor, that can be considered as a quantity characteristic of the molecules in which the unpaired electrons are located, was found to be 2.28 for M-poly（GMA）. The external magnetic field at resonance was calculated to be 2055 Gs which was found sufficient to excite all of the dipole moments present in 1.0 g of M-poly（GMA） sample.
文摘建立了同时测定糖苷类表面活性剂产品中单糖和多糖含量的高效液相色谱法。采用Zorbax Eclipse Plus C_(18)色谱柱(4.6mm×100mm,3.5μm)分离,甲醇-水梯度洗脱,流速1.0 mL/min,蒸发光散射检测器检测。用葡萄糖和麦芽三糖为对照品,外标两点法同时测定糖苷产品中单糖和多糖的含量。结果表明,单糖和多糖的检出限分别约为1.5和2.0μg/L,回收率分别为100.4%和99.1%。与既有方法相比,此方法可以同时分析产品中残留原料糖和副产物多糖的含量,且在分析非还原性单糖方面具有独特优势。
文摘The perturbations of ATP on oscillatory reactions of monose (fructose or glucose)-acetone-Mn 2+ -BrO - 3-H 2SO 4 systems were investigated. The experimental results show that the induced times and periods of the oscillating reactions are increased with ATP concentration. The kinetics behaviour of the pertubation is explained by FKN mechanism.
