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Measuring the fermion Yukawa coupling constants is important for understanding the origin of the fermion masses and their relationship with spontaneously electroweak symmetry breaking.In contrast,some new physics(NP)models change the Lorentz structure of the Yukawa interactions between standard model(SM)fermions and the SM-like Higgs boson,even in their decoupling limit.Thus,the precise measurement of the fermion Yukawa interactions is a powerful tool of NP searching in the decoupling limit.In this work,we show the possibility of investigating the Lorentz structure of the bottom-quark Yukawa interaction with the 125 GeV SM-like Higgs boson for future e^+e^- colliders. 相似文献
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Conductive perovskite BaPb03 (BPO) films as a potential electrode material of PZT capacitors used in ferroelectric random access memory are prepared by rf magnetron sputtering. An x-ray diffractometer and standard four probe method are employed to investigate the dependence of growth conditions on crystal structure and conductivity of BPO films. It is found that BPO films with perovskite phase can be obtained at substrate temperatures above 425℃, and the sample with the lowest resistivity is obtained at 450℃ under pure argon atmosphere. Using this BPO film as electrode, ferroelectric properties of BPO/PZT/BPO and Pt/PZT/BPO sandwiched structures are evaluated. Their remanent polarization and coercive field are 36.6 ℃/cm^2 (81.3 k V/cm) and 36.9℃/cm^2 (89.1 kV/cm), respectively. The coercive field of the former structure is lower than that of the latter, but remanent polarizations are almost the same. In addition, the results imply that BPO electrode is helpful to improve the fatigue resistance of PZT. The reasons are discussed. 相似文献
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李先和杨加桂张晓天高俊江陈冉冉 《理化检验(化学分册)》2018,(1):69-72
样品(0.400 0 g)置于50 mL样品管中,加入盐酸-硝酸-水(3+1+4)混合液10 mL,饱和氟化氢铵溶液1.0 mL,经石墨消解仪斜坡升温进行消解。消解液冷却10 min,用水定容至50 mL。分取10.0 mL,用水稀释至20 mL,所得溶液采用电感耦合等离子体质谱法测定其中银及铂族元素(钌、铑、钯、铱、铂、金)的含量。以标准加入法补偿基体效应制作标准曲线。在质谱分析中采用标准模式。7种元素的检出限(3s)在0.01~0.80μg·L^(-1)之间。按标准加入法进行回收试验,回收率在94.0%~105%之间,相对标准偏差(n=11)在0.70%~2.1%之间。按上述方法分析铜冶炼渣尾矿样品,结果与石墨炉原子吸收光谱法测定结果基本一致。 相似文献
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高岭土合成4A沸石晶化历程 总被引:6,自引:0,他引:6
4A沸石是广泛用于催化、污水处理、洗涤剂助剂等领域的一种人工合成沸石分子筛[1,2].采用化学合成法,沸石分子筛是在无定形凝胶和水溶液共存的体系中生成[3].以高岭土为原料,在低温水热条件下进行4A沸石的合成时,由于高岭土并不完全溶解于碱性溶液中,因而这一固液两相体系的反应过程,可能是在偏高岭土无定形的表面上完成.本文通过对合成过程液相成分的变化和固相特征分析,探索了该条件下4A沸石晶核生成及其成长历程.81999-04-19收稿,1999-06-25修回内蒙古自然科学基金资助课题(971302-2)合成原料为n(StQ):n(AI。O。)一2.06:1的… 相似文献
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光抽运亚稳态稀有气体激光器利用放电等离子体作为激光的增益介质.为掌握容性射频放电的放电参数对等离子体各项参数的影响的基本规律,利用等离子体发射光谱法研究了氦氩混合气体在不同装置、不同Ar组分、不同气压和不同射频注入功率下的等离子体参数.利用残留水蒸气产生的OH自由基A~2Σ~+→X~2Π的转动光谱分析获得气体温度;利用电子态光谱的玻尔兹曼做图法获得电子激发温度,利用Ar原子696.5 nm谱线的斯塔克展宽获得电子密度.结果表明:气体温度随气压增加略微上升,在一个大气压下改变组分和放电功率,气体温度变化不大;电子激发温度随总气压的下降而上升,且随着Ar组分的增加而略微下降;目前放电条件下的电子密度均在10~(15)cm~(-3)量级;长时间放电监测表明,残留的水蒸气会导致电子温度的下降,从而降低Ar亚稳态的产率. 相似文献
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