An all-optical phase detector by amplitude modulation of the local field in a Rydberg atom-based mixer

Recently, a Rydberg atom-based mixer was developed to measure the phase of a radio frequency (RF) field. The phase of the signal RF (SIG RF) field is down-converted directly to the phase of a beat signal created by the presence of a local RF (LO RF) field. In this study, we propose that the Rydberg atom-based mixer can be converted to an all-optical phase detector by amplitude modulation (AM) of the LO RF field; that is, the phase of the SIG RF field is related to both the amplitude and phase of the beat signal. When the AM frequency of the LO RF field is the same as the frequency of the beat signal, the beat signal will further interfere with the AM of the LO RF field inside the atom, and then the amplitude of the beat signal is related to the phase of the SIG RF field. The amplitude of the beat signal and the phase of the SIG RF field show a linear relationship within the range of 0 to π/2 when the phase of the AM is set with a difference π/4 from the phase of the LO RF field. The minimum phase resolution can be as small as 0.6° by optimizing the experimental conditions according to a simple theoretical model. This study will expand and contribute to the development of RF measurement devices based on Rydberg atoms.     

火焰原子吸收法测定中草药海金沙茎中五种金属元素的含量

目的运用火焰原子吸收光谱法测定中草药海金沙茎中的Fe、zn、Mg、Ca、Cu5种微量元素的含量。方法用浓HNO3-HCIO4消解样品,采用标准曲线法测定其5种金属元素含量。结果所测的样品中含有丰富的人体必需微量元素。方法回收率在98.68％～104.4％之间,样品相对偏差小于5％。结论该法快速简便、重复性好、准确度好,适用于同类生物样品中微量元素的测定,结果令人满意。     

石菖蒲根中微量元素的含量分析

目的：运用火焰原子吸收光谱法测定中药石菖蒲根中的 Fe、 Zn、 Mg、 Ca、 Cu 5种金属元素的含量。方法用浓 HNO3-HClO4消解样品,采用标准曲线法测定其5种金属元素含量。结果所测的样品中含有丰富的人体必需微量元素,尤其是 Fe 含量极高。方法回收率在98．60％～104．60％之间,样品相对偏差小于5％。结论该法简单、准确,结果令人满意。     

基于硝基咪唑衍生物的Cu（Ⅱ）、Ag（Ⅰ）配合物的合成、晶体结构及生物活性

设计、合成了硝基咪唑衍生物N,N'-二甲基-5-硝基-2,2'-联咪唑(L)的过渡金属配合物[Cu(L)(Ac)_2]_2(1)和[Ag(L)(NO_3)·H_2O(2)。X射线单晶衍射分析表明配合物1是一个醋酸根桥联的五配位双核Cu(Ⅱ)浆轮笼型配合物。通过元素分析、紫外光谱、红外光谱、固体荧光光谱、电喷雾质谱、摩尔电导率及热重分析等测试手段对配合物2进行了性质表征,初步确定了其结构可能为二配位的线型单核配合物。紫外可见光谱、荧光光谱及黏度法分析表明配合物1与小牛胸腺DNA(ct-DNA)相互作用强于配体及配合物2。以2倍稀释法研究了配体L及配合物的抗厌氧菌活性,发现配体对伴放线放线杆菌(ATCC 29523)的抑菌活性最强(最低抑菌浓度MIC=0.625～1.25 μg·mL~(-1)),这甚至要强于经典抗厌氧菌药物甲硝唑的抗菌性。     

Anti-tumor Metastasis and Crystal Structure of N1（1,3,4-Thiadiazole-2-yl）-N3-m-chlorobenzoyl-urea

The title compound N 1-(1,3,4-thiadiazole-2-yl)-N 3-m-chlorobenzoyl-urea (C 9 H 7 N 4 OSCl,M r=254.70) was prepared by the reaction of m-chlorophenyl isocyanate with 2-amino-1,3,4-thiadiazole in dry acetonitrile.The effect of the title compound on tumor metastasis was analyzed by Lewis-lung-carcinoma model.The bioassay showed that the title compound significantly reduced the number of lung metastasis.The crystal structure has been determined by X-ray diffraction.The crystal belongs to the monoclinic system,space group P2 1 /c with a=11.565(2),b=9.5616(19),c=10.221(2),β=111.75(3)°,Z=4,V=1049.8(4)3,D c=1.612 Mg/m 3,F(000)=520,μ(MoKa)=0.544 mm-1,R=0.0468 and wR=0.0922 for 1236 observed reflections (I > 2σ(I)).     

石墨相C3N4的高温高压研究

为了得到超硬相的C3N4,利用石墨相C3N4(gC3N4)为实验的初始原料,利用六面顶压机高温高压实验技术,对gC3N4进行了高温高压研究.实验结果表明,在5.2 GPa、600 ℃和5.2 GPa、800 ℃两个压力和温度点,制备的样品经过X射线衍射(XRD)分析,样品仍然为gC3N4,当温度升到1000 ℃时,发现样品发生了变化,经XRD和X光电子能谱（XPS）分析,gC3N4完全分解为石墨.     

工作激情影响员工创造性绩效的中介机制

员工创造性绩效影响机制的研究缺乏对认知、动机和情感机制交互作用的探讨,工作激情是进行3种影响机制融合研究的最佳变量.以204名企业员工及其对应主管为研究对象,采用两时点滞后的纵向研究方法,以激情二元模型为基础,以认知投入、成就目标导向和情绪调节作为代表变量,对员工工作激情影响创造性绩效的认知、动机和情感机制的整合路径进行研究.结果表明:和谐的工作激情同时通过动机通道(掌握趋近目标导向)和情感通道(认知重评与表达抑制两种情绪调节策略)作用于认知机制(认知投入),进而影响创造性绩效;强迫的工作激情仅通过动机通道(绩效趋近目标导向与绩效回避目标导向)作用于认知机制(认知投入),进而影响创造性绩效.     

氮化碳的高压同步辐射研究

 采用金刚石对顶砧及原位同步辐射实验技术,对高温高压有机催化反应制备的氮化碳材料,进行了室温及直到44 GPa压力条件下的原位高压同步辐射X射线衍射研究,并用最小二乘法拟合了样品的Murnaghan型等温状态方程。结果表明,在室温及直到44 GPa压力条件下,石墨相C₃N₄和待定的正交相CN材料都是稳定的,没有发生明显的相变,推测正交相CN材料可能是原始材料三聚氰胺和三聚氰氯在高温高压条件下催化热解产生的某种高分子有机聚合物。     

不同力学激励形式探索La基非晶合金微观结构非均匀性

非晶合金力学行为与其微观结构非均匀性之间本征关联,是固体力学研究领域至今未能很好解决的重要科学问题之一.单一力学激励形式并不能有效地描述非晶合金微观结构非均匀性,特别是结构与动力学的关联.如何探索非晶合金结构信息,须将诸多因素综合,在不同力学激励下研究非晶合金微观结构非均匀性与变形机理.本研究以La₆₂Cu₁₂Ni₁₂Al₁₄非晶合金为模型体系,利用动态力学分析仪研究非晶合金动态弛豫行为.基于准点缺陷模型,对模型合金体系α弛豫和β弛豫进行了分离.借助于拉伸应变率跳实验,探索非晶合金高温流变行为.确定非晶合金塑性流变过程中弹性、滞弹性以及塑性变形的贡献.本研究从非晶合金动态力学弛豫行为和宏观塑性流变行为出发,尝试揭示微观非均匀性对非晶合金在不同激励形式中缺陷的激活、扩展和融合的物理本质.     

PMMA掺杂对P3HT/P(VDF-TrFE)复合薄膜阻变性能影响研究

Organic semiconducting/ferroelectric blend films attracted much attention due to their elec-trical bistability and rectification properties and thereof the potential in resistive memory devices. Blend films were usually deposited from solution, during which phase separation oc-curred, resulting in discrete semiconducting phase whose electrical property was modulated by surrounding ferroelectric phase. However, phase separation resulted in rough surface and thus large leakage current. To further improve electrical properties of such blend films, poly(methyl metacrylate) (PMMA) was introduced as additive into P3HT/P(VDF-TrFE) semiconducting/ferroelectric blend films in this work. It indicated that small amount of PMMA addition could effectively enhance the electrical stability to both large electrical stress and electrical fatigue and further improve retention performance. Overmuch PMMA addition tended to result in the loss of resistive switching property. A model on the con-figuration of three components was also put forward to well understand our experimental observations.