1999年7月。教育部部长陈至立在网上笞考生及家长提问。问:未来5年我国最紧缺的人才是什么?答:计算机人才。问:未来10年我国最缺乏的人才是什么、答:还是计算机人才。零点公司最近的一项调查显示:加入WTO后.中国最缺的人才排名前三位依...1999年7月。教育部部长陈至立在网上笞考生及家长提问。问:未来5年我国最紧缺的人才是什么?答:计算机人才。问:未来10年我国最缺乏的人才是什么、答:还是计算机人才。零点公司最近的一项调查显示:加入WTO后.中国最缺的人才排名前三位依次是:1.IT人才 2.外贸谈判人才 3.法律人才美国国际数据公司(International Data Cor-poration)研究报告称,目前IT技术人员极度短缺。展开更多
The proton ceramic electrochemical cell(PCEC),distinguished by its robust all-solid-state construction,emerges as a particularly promising contender in the realm of hydrogen production technologies.However,inadequate ...The proton ceramic electrochemical cell(PCEC),distinguished by its robust all-solid-state construction,emerges as a particularly promising contender in the realm of hydrogen production technologies.However,inadequate water-storage capability(hydration)and limited proton mobility within conventional PCEC oxygen electrodes hinder the efficiency of water splitting to oxygen,thereby restricting the broader application of PCECs.Here,we report a Ni-doped perovskite oxygen electrode Sr_(2)Fe_(1.4)Ni_(0.1)Mo_(1.5)O_(6-δ)(SFNM),where the incorporation of nickel can effectively amplify the concentration of oxygen vacancies while synergistically enhancing the hydration interaction between water molecules and the perovskite lattice.The enhanced hydration capacity facilitates proton-defect formation and lowers the energy barrier for proton migration.Benefiting from these synergistic enhancements,SFNM demonstrates a substantially reduced polarization resistance of approximately 0.078Ωcm^(2)at700℃under humidified conditions(pH_(2)O=0.1 atm).A PCEC utilizing the SFNM electrode achieves a remarkable current density of 2.60 A cm^(2)with an applied voltage of 1.3 V at 700℃.Furthermore,the PCEC exhibits favorable stability over a duration of 200 h.These outstanding results emphasize the potential of Ni doping to substantially improve both the hydration efficiency and proton mobility within perovskite electrode materials,positioning them as excellent candidates for high-performance PCECs.展开更多
目的制备中药血痛定喷雾剂,并考察其对体外凝血指标的影响。方法通过高分子材料PCEC合成、制备可同时传输疏水性(独一味、祖师麻)和亲水性药物(三七)的高效透皮给药的中药外用喷雾剂——血痛定喷雾剂。结果制备的血痛定喷雾剂纳米粒呈...目的制备中药血痛定喷雾剂,并考察其对体外凝血指标的影响。方法通过高分子材料PCEC合成、制备可同时传输疏水性(独一味、祖师麻)和亲水性药物(三七)的高效透皮给药的中药外用喷雾剂——血痛定喷雾剂。结果制备的血痛定喷雾剂纳米粒呈圆形颗粒状分布,峰形单一,平均粒径32.86 nm,带负电荷,电位-1.79 m V。随着喷雾剂浓度的增加,体外凝血酶时间、部分激活的凝血酶时间降低,凝血酶原时间呈不规律性变化,纤维蛋白原呈先递减后递增的趋势。结论成功制备血痛定喷雾剂,明确其对体外凝血指标的止血作用。展开更多
研究建立利用加压毛细管电色谱(p CEC)测定乳及乳制品中三聚氰胺的分析方法。样品采用2%三氯乙酸水溶液超声提取,阳离子固相萃取柱(MCX)净化,提取液经C18反相毛细管电色谱柱分离,流动相乙腈-10 mmol/L辛烷磺酸钠溶液(p H 3.0)=15+85,泵...研究建立利用加压毛细管电色谱(p CEC)测定乳及乳制品中三聚氰胺的分析方法。样品采用2%三氯乙酸水溶液超声提取,阳离子固相萃取柱(MCX)净化,提取液经C18反相毛细管电色谱柱分离,流动相乙腈-10 mmol/L辛烷磺酸钠溶液(p H 3.0)=15+85,泵流速0.05 m L/min,分离电压-2 k V,紫外检测器240 nm检测。该方法在1.0 mg/kg^100 mg/kg质量浓度范围内线性关系良好(R2=0.999),在牛奶和酸奶中的定量限为2.5 mg/kg,在奶粉中的定量限为10 mg/kg,加标回收率为78.9%~93.5%,相对标准偏差小于5%。展开更多
文摘1999年7月。教育部部长陈至立在网上笞考生及家长提问。问:未来5年我国最紧缺的人才是什么?答:计算机人才。问:未来10年我国最缺乏的人才是什么、答:还是计算机人才。零点公司最近的一项调查显示:加入WTO后.中国最缺的人才排名前三位依次是:1.IT人才 2.外贸谈判人才 3.法律人才美国国际数据公司(International Data Cor-poration)研究报告称,目前IT技术人员极度短缺。
基金financially supported by the National Key R&D Program of China(No.2022YFB4002501)the National Natural Science Foundation of China(No.52202208)
文摘The proton ceramic electrochemical cell(PCEC),distinguished by its robust all-solid-state construction,emerges as a particularly promising contender in the realm of hydrogen production technologies.However,inadequate water-storage capability(hydration)and limited proton mobility within conventional PCEC oxygen electrodes hinder the efficiency of water splitting to oxygen,thereby restricting the broader application of PCECs.Here,we report a Ni-doped perovskite oxygen electrode Sr_(2)Fe_(1.4)Ni_(0.1)Mo_(1.5)O_(6-δ)(SFNM),where the incorporation of nickel can effectively amplify the concentration of oxygen vacancies while synergistically enhancing the hydration interaction between water molecules and the perovskite lattice.The enhanced hydration capacity facilitates proton-defect formation and lowers the energy barrier for proton migration.Benefiting from these synergistic enhancements,SFNM demonstrates a substantially reduced polarization resistance of approximately 0.078Ωcm^(2)at700℃under humidified conditions(pH_(2)O=0.1 atm).A PCEC utilizing the SFNM electrode achieves a remarkable current density of 2.60 A cm^(2)with an applied voltage of 1.3 V at 700℃.Furthermore,the PCEC exhibits favorable stability over a duration of 200 h.These outstanding results emphasize the potential of Ni doping to substantially improve both the hydration efficiency and proton mobility within perovskite electrode materials,positioning them as excellent candidates for high-performance PCECs.
文摘目的制备中药血痛定喷雾剂,并考察其对体外凝血指标的影响。方法通过高分子材料PCEC合成、制备可同时传输疏水性(独一味、祖师麻)和亲水性药物(三七)的高效透皮给药的中药外用喷雾剂——血痛定喷雾剂。结果制备的血痛定喷雾剂纳米粒呈圆形颗粒状分布,峰形单一,平均粒径32.86 nm,带负电荷,电位-1.79 m V。随着喷雾剂浓度的增加,体外凝血酶时间、部分激活的凝血酶时间降低,凝血酶原时间呈不规律性变化,纤维蛋白原呈先递减后递增的趋势。结论成功制备血痛定喷雾剂,明确其对体外凝血指标的止血作用。
文摘研究建立利用加压毛细管电色谱(p CEC)测定乳及乳制品中三聚氰胺的分析方法。样品采用2%三氯乙酸水溶液超声提取,阳离子固相萃取柱(MCX)净化,提取液经C18反相毛细管电色谱柱分离,流动相乙腈-10 mmol/L辛烷磺酸钠溶液(p H 3.0)=15+85,泵流速0.05 m L/min,分离电压-2 k V,紫外检测器240 nm检测。该方法在1.0 mg/kg^100 mg/kg质量浓度范围内线性关系良好(R2=0.999),在牛奶和酸奶中的定量限为2.5 mg/kg,在奶粉中的定量限为10 mg/kg,加标回收率为78.9%~93.5%,相对标准偏差小于5%。
