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超高效液相色谱-串联质谱法对动物源食品中13种林可胺类及大环内酯类药物残留的检测 总被引:3,自引:1,他引:2
建立了动物源食品中林可霉素、克林霉素、吡利霉素、红霉素、泰乐菌素、螺旋霉素、替米考星、竹桃霉素、吉他霉素、克拉霉素、阿奇霉素、罗红霉素和交沙霉素13种林可胺类和大环内酯类药物残留检测的超高效液相色谱-串联质谱分析方法.动物组织样品经乙腈提取后,用正己烷去除脂肪等杂质,然后用Waters Acquity UPLC BEH C18色谱柱分离,以乙腈和50 mmol/L乙酸铵水溶液为流动相进行梯度洗脱,电喷雾正离子(ESI+)模式电离,多反应监测模式检测.结果表明:13种药物在5 ~200 μg/L范围内呈现良好的线性关系,相关系数R2均大于0.990,13种药物在动物组织中的检出限均为1 μg/kg,定量下限均为2.5 μg/kg.以2.5、25、100 μg/kg 3个水平进行回收实验,13种药物的回收率为72% ~104%,批内批间相对标准偏差为4.8% ~14.3%. 相似文献
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Co-doped TiO2 thin films are grown on TiN buffered silicon substrates by the pulsed laser deposition method and then hydrogenated. Transmission electron microscopy and high-angle annular dark-field scanning transmission electron microscopy measurements have shown that the TiN buffer layer can suffer a 400℃ deposition temperature and prevent the growth of silicon dioxide on silicon. After that, the room temperature ferromagnetism behaviors are observed in the hydrogenated samples, which are measured by the alternating gradient magnetometer. X- ray photoelectron spectroscopy and x-ray absorption fine structure measurements have revealed the existence of cobalt clusters. According to the material analysis, the magnetic behavior after hydrogenation is suggested to be induced by the enhancement of cobalt dusters. 相似文献
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肖特基二极管是2.45 G弱能量密度无线能量收集系统的核心器件,其性能决定了系统整流效率的上限.从材料设计角度出发,利用晶向优化技术和Sn合金化技术,提出并设计了一种大有效质量、大亲和能和高电子迁移率的Ge基复合半导体.在此基础上,进一步利用器件仿真工具,设定合理的器件材料物理参数与几何结构参数,实现了一种2.45 G弱能量微波无线输能用Ge基肖特基二极管.基于该器件SPICE模型的ADS整流电路仿真表明:与传统Ge肖特基二极管相比,该新型Ge基肖特基二极管在输入能量为–10—–20 d Bm的弱能量工作区域,能量转换效率提升约10%.本文技术方案及相关结论,可为解决2.45 G弱能量密度无线能量收集系统整流效率低的问题提供有益的参考. 相似文献
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采用固相反应法,将ZnO和Co2O3粉末按不同的成分配比混合,制备了稀磁半导体Zn1-xCoxO (x=0.02,0.06,0.10)材料.并使用H2气氛退火技术对样品进行了处理,得到了具有室温铁磁性的掺Co氧化锌稀磁半导体.利用全自动X射线衍射仪、X射线光电子能谱仪、高分辨透射电子显微镜和超导量子干涉器件磁强计对样品的结构、晶粒的尺寸、微观形貌以及磁性等进行了测量和标度.
关键词:
稀磁半导体
氧化锌
掺杂
固相反应法 相似文献
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超高效液相色谱-串联质谱法对动物源性食品中13种β-内酰胺类药物残留的检测 总被引:5,自引:3,他引:5
建立了动物源性食品中青霉素G、青霉素V、阿莫西林、羧苄西林、氨苄西林、苯唑西林、氯唑西林、萘夫西林、头孢喹肟、头孢氨苄、头孢拉定、头孢唑啉和头孢哌酮13种β-内酰胺类药物残留检测的超高效液相色谱-串联质谱(UPLC-MS/MS)分析方法.样品经水和乙腈提取后,用正己烷去除脂肪,再用C18固相萃取柱净化,浓缩后用BEH C18色谱柱(50 mm×2.1 mm,1.7 μm)分离 ,以0.1%甲酸乙腈溶液和0.1%甲酸水溶液为流动相进行梯度洗脱,电喷雾正离子(ESI+)模式电离,多反应监测(MRM)模式检测.结果表明:在5 ~500 μg/L的基质匹配标准溶液内13种β-内酰胺类药物均有良好的线性关系,相关系数(r)均大于0.998;样品中13种β-内酰胺类药物的检出限(LOD)均为1 ng/g,定量下限(LOQ)均为2 ng/g;在5 ~50 ng/g的加标范围内13种β-内酰胺类药物的平均回收率为79% ~99%,相对标准偏差(RSD)小于13.5%. 相似文献
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In this paper, we propose a novel Schottky barrier MOSFET structure,
in which the silicide source/drain is designed on the buried metal
(SSDOM). The source/drain region consists of two layers of silicide
materials. Two Schottky barriers are formed between the silicide
layers and the silicon channel. In the device design, the top barrier
is lower and the bottom is higher. The lower top contact barrier is
to provide higher {on-state} current, and the higher bottom contact
barrier to reduce the off-state current. To achieve this, ErSi is
proposed for the top silicide and CoSi2 for the bottom in the
n-channel case. The 50~nm n-channel SSDOM is thus simulated to
analyse the performance of the SSDOM device. In the simulations, the
top contact barrier is 0.2e~V (for ErSi) and the bottom barrier is
0.6eV (for CoSi2. Compared with the corresponding conventional
Schottky barrier MOSFET structures (CSB), the high on-state
current of the SSDOM is maintained, and the off-state current is
efficiently reduced. Thus, the high drive ability (1.2mA/μm
at Vds=1V,
Vgs=2V) and the high Ion/Imin ratio (106)
are both achieved by applying the SSDOM
structure. 相似文献
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超高效液相色谱-串联质谱法测定猪肝中有机磷农药残留量的研究 总被引:2,自引:0,他引:2
建立了猪肝组织中敌百虫、敌敌畏、马拉硫磷、巴胺磷、倍硫磷、二嗪农和辛硫磷7种有机磷农药残留的超高效液相色谱-串联质谱(UPLC-MS/MS)测定方法。样品经乙酸乙酯提取后,用Carb/PSA(碳黑/乙二胺-N-丙基)复合萃取柱净化,经超高效液相色谱仪和C18色谱柱分离,以甲醇和10 mmol/L乙酸铵水溶液为流动相进行梯度洗脱。电喷雾正离子模式(ESI+)电离,多反应监测模式(MRM)检测,外标法定量。结果表明:7种有机磷农药标准溶液在10~1 000μg/L范围内呈现良好的线性关系,r2均不小于0.995 0,方法检出限为5μg/kg,定量下限为10μg/kg;7种有机磷农药在10~50μg/kg添加水平范围内的回收率为70%~92%,批内、批间RSD均小于16%。该方法具有简便、快捷、灵敏度高、定性准确等优点,满足食品安全检测有关法规的要求。 相似文献