Tunable enhanced spatial shifts of reflective beam on the surface of a twisted bilayer of hBN

We investigated Goos-Hänchen (GH) and Imbert-Fedorov (IF) shifts of a reflective beam on a twisted bilayer of hexagonal boron nitride (hBN), where a left circularly polarized beam was incident on the surface. Our results demonstrate that the twist angle between the two optical axes plays an important role in obtaining large shifts with a high reflectivity. The GH shift with 10λ₀ is achieved, while the reflectivity is near 100% by tuning the twist angle. The maximum of the IF shift is found in the certain condition satisfied by the reflective coefficients, and the shift strongly depends on the twist angle between the optical axes of the two slabs. The spatial shifts obtained directly from the GH and IF shift definitions were provided, which indicate that the theoretical results from the stationary phase method are believable. These results may open up a new way for developing the nano-optical devices.     

免疫质谱法检测肝癌血清多肽标志物

建立免疫亲和富集分离与质谱分析相结合的免疫质谱法用于血清多肽标志物pep5的检测。多克隆抗体与蛋白A琼脂糖颗粒偶联用于捕获pep5,基质辅助激光解析电离飞行时间质谱检测标志物。本方法的线性范围为1～48 nmol/L,检出限0.2 nmol/L;回收率为93.0%～103.1%,相对标准偏差(RSD)为6.4%～11.8%;反复冻融3次pep5,检测结果稳定;检测临床肝癌/正常血清样本灵敏度为78.0%、特异度为90%。该方法方便、快速、准确,适用于临床样本中低浓度标志物的检测研究,对于癌症的早期诊断具有重要意义。     

High temperature thermoelectric properties of highly c-axis oriented Bi2Sr2Co2Oy thin films fabricated by pulsed laser deposition

High-temperature thermoelectric transport property measurements have been performed on the highly c-axis oriented Bi2Sr2Co20v thin films prepared by pulsed laser deposition on LaA1Oa （001）. Both the electric resistivity p and the seebeck coefficient S of the film exhibit an increasing trend with the temperature from 300 K-1000 K and reach up to 4.8 m. cm and 202 V/K at 980 K, resulting in a power factor of 0.85 mW/mK which are comparable to those of the single crystalline samples. A small polaron hopping conduction can be responsible for the conduction mechanism of the film at high temperature. The results demonstrate that the Bi2Sr2Co2Oy thin film has potential application has high temperature thin film thermoelectric devices,     

High temperature thermoelectric properties of highly c-axis oriented Bi₂Sr₂Co₂O_y thin films fabricated by pulsed laser deposition

High-temperature thermoelectric transport property measurements have been performed on the highly c-axis oriented Bi2Sr2Co2Oy thin films prepared by pulsed laser deposition on LaAlO3(001).Both the electric resistivity ρ and the seebeck coefficient S of the film exhibit an increasing trend with the temperature from 300 K-1000 K and reach up to 4.8 m·Ω· cm and 202 μV/K at 980 K,resulting in a power factor of 0.85 mW/mK which are comparable to those of the single crystalline samples.A small polaron hopping conduction can be responsible for the conduction mechanism of the film at high temperature.The results demonstrate that the Bi2Sr2Co2Oy thin film has potential application in high temperature thin film thermoelectric devices.     

X射线衍射双峰的Voigt峰形函数拟合

给出了Voigt函数的一种计算方法,同时给出了一种用Voigt峰形函数拟合由Kα1、Kα2引起的晶体X射线双峰衍射谱的一种算法,此算法可同时对多个衍射双峰进行拟合和分峰,从而给出较准确的衍射峰宽度,用于计算晶体颗粒尺寸和应力等.用此算法计算了纳米GSGG的颗粒度,结果表明:在低角度,双峰叠加对衍射峰的半高全宽的影响可忽略,而在高角度双峰的衍射间隔加宽,使计算获得的粒度明显偏小.     

基于同伦分析方法的一种改进的试位法

应用同伦分析方法,提出了一种求解非线性方程改进的试位法．给出的一些数值例证显示了该运算法则的有效性．     

课堂观察视野下的科学探究活动——安徽省高中化学优质课评析及反思

制作观察量表,用“课堂观察”的方法对新课程倡导的科学探究活动中学生自主学习的情况进行观察和研究,能够更加客观地评价探究活动的有效性问题,为教师的个人反思提供方向,探寻更加合理的科学探究模式。     

聚甲醛在强磁场下结晶的形貌分析

采用电子显微分析、X射线衍射法、傅里叶红外光谱法及差示扫描量热法分析强磁场对聚甲醛的结晶形态与片晶分布的影响, 探讨了微观组织特征与晶体学取向之间的关系. 研究结果表明, 聚甲醛(POM)在强磁场(12 T)作用下, 片晶厚度以及片晶间距都发生了明显的增大, 熔点升高, 分子链受到磁场的诱导而趋于定向结晶, 产生了沿磁场方向排列的类似漩涡状的结晶形貌.     

假丝酵母和白地霉的原生质体融合研究

对影响假丝酵母和白地霉原生质体制备与再生的因素:菌龄、破壁酶的种类和浓度、酶解时间、脱壁促进剂、渗透压稳定剂进行了研究。在综合比较原生质体制备率和再生率基础上,确定了制备原生质体的优化条件为:选用对数生长中期的菌体,用0.05%EDTA进行预处理,以0.7 mol/L NaCl为渗     

二(μ-叠氮)二[N,N'-二(2-吡啶甲基)乙二胺]合二镍(Ⅱ)配 合物的结构与磁性

合成并通过元素分析、红外光谱、电子光谱等方法表征了叠氮桥联的双核配合物[Ni2(bispicen)2(μ-N3)2](ClO4)2[bispicen=N,N'-二(2-吡啶甲基)乙二胺].用单晶X射线衍射技术测定了配合物的晶体结构,晶体属正交晶系,P212121空间群,镍(Ⅱ)离子处于变形八面体配位环境,并采取cis-α构型,两个以μ-1,3桥联方式配位的叠氮离子之间呈罕见的交错式非平面排列。变温磁化率测定表明配合物两个镍(Ⅱ)离子之间存在反铁磁相互作用,基于H^=-2JS1^S2^的磁性分析表明磁交换积分J=-28.1cm^-1。