双-(二烷硫基四硫富瓦烯二硫)金属配合物的合成及性质研究

合成了三种未见文献报道的双-(二烷硫基四硫富瓦烯二硫)金属配合物和三种新的四硫富瓦烯(TTF)桥联的双金属配合物,测定了它们的导电率,讨论了含Ni配合物的电导率优于含Cu,Hg配合物的原因。     

Solventless Formation of G‐Quartet Complexes Based on Alkali and Alkaline Earth Salts on Au(111)

Template cations have been extensively employed in the formation, stabilization and regulation of structural polymorphism of G‐quadruplex structures in vitro. However, the direct addition of salts onto solid surfaces, especially under ultra‐high‐vacuum (UHV) conditions, to explore the feasibility and universality of the formation of G‐quartet complexes in a solventless environment has not been reported. By combining UHV‐STM imaging and DFT calculations, we have shown that three different G‐quartet‐M (M: Na/K/Ca) complexes can be obtained on Au(111) using alkali and alkaline earth salts as reactants. We have also identified the driving forces (intra‐quartet hydrogen bonding and electrostatic ionic bonding) for the formation of these complexes and quantified the interactions involved. Our results demonstrate a novel route to fabricate G‐quartet‐related complexes on solid surfaces, providing an alternative feasible way to bring metal elements to surfaces for constructing metal–organic systems.     

后疫情时代微信融入无机化学实验教学的初探

针对后疫情时代的教学需要和地方高校的信息化教学资源的不足,通过创建微信公众号和微信群,初步探索了微信融入无机化学实验教学的新模式。课前通过公众号的推文引导学生进行有目标的预习,养成自主学习和独立思考的习惯。课堂中,先通过微信群进行预习测试,并基于测试反馈调整需要重点讨论的实验要点,再通过微信群共享师生在实验过程中对实验操作、实验现象和实验结果拍摄的照片或视频,充分激发学生兴趣,提升学生的能力。课后结合拍摄的错误操作的照片撰写公众号推文,进行实验反馈,帮助学生形成反思的习惯。     

GaAs与InP半导体光导开关特性实验研究

利用Ⅲ-Ⅴ族化合物半导体材料砷化镓(GaAs)和磷化铟(InP)及其掺杂材料制作的光导开关具有很好的时间响应及高功率输出特性.比较了这两种材料制作的不同电极间隙类型的光导开关的开关时间响应速度、导通光能与饱和触发激光能量、线性与非线性工作模式及触发稳定性等特性.结果表明,利用InP和GaAs两种材料制作的光导开关都具有达到皮秒级的超快时间响应,其对时间最佳响应与偏置电场有关.两种开关的多次触发时间抖动在几个皮秒范围,输出电压峰峰值抖动优于10%.GaAs开关的非线性工作电场阈值比InP开关低,更容易实现非线性输出.     

单级G-M 150制冷机性能实验研究

为满足高温超导和低温气体处理系统等工程应用项目的大冷量需求,单级大冷量G-M制冷机成为目前国内外的研究热点。文章中描述了以G-M150为基础的制冷机综合性能测试方法及实验平台,并对其制冷温度和制冷量两个主要性能的影响因素进行实验研究,为探讨20K单级大冷量G-M制冷机的研究提供参考。     

单极型马赫-曾德尔调制器的互调失真分析

针对单极型马赫曾德尔电光调制器在Radio over Fiber(RoF)和副载波复用系统中的应用,讨论了输入两路射频信号的情形,给出了电光调制器互调失真的严格通用解析解。该解析解可用于表示任意阶的互调失真项和谐波项。数值结果表明了该解析解的正确性。分析结果表明,调制器的三阶互调失真与调制器偏置相移无关,只与输入射频信号的调制系数有关,并且当外加偏置电压等于调制器的半波电压时,只存在偶数阶的失真项。根据该解析解,可方便地设计模拟光通信系统,精确地预计外调制器的非线性特征,优化系统性能。     

叶酸靶向复合脂质体中阿霉素和维拉帕米含量的测定

建立叶酸靶向复合脂质体中阿霉素和维拉帕米含量测定的反相高效液相色谱法。阿霉素在0.5—60μg/mL范围内呈良好线性关系,平均回收率97.3%;维拉帕米在1.0—50.0μg/mL范围内呈良好线性关系,平均回收率97.2%。本方法灵敏度高,专属性强,重现性好,操作简便,能准确测定叶酸靶向复合脂质体中阿霉素和维拉帕米的含量。     

Simultaneous measurement of curvature and temperature based on PCF-based interferometer and fiber Bragg grating

A sensor head consisting of a photonic crystal fiber (PCF)-based Mach-Zehnder interferometer (MZI) and a fiber Bragg grating (FBG) is proposed and experimentally demonstrated for simultaneous measurement of curvature and temperature. The MZI fabricated by splicing a short length of PCF between two single-mode fibers with the air-hole structure that completely collapsed near the splicing points, is sensitive to fiber bending and surrounding temperature, while the FBG is only sensitive to the later. Simultaneous measurement of curvature and temperature is therefore obtained. Sensitivities of 4.06 nm/m^− 1 and 6.30 pm/°C are achieved experimentally for curvature and temperature, respectively. And the corresponding resolutions are 5.2 × 10^− 4 m^− 1 and 1.25 °C for curvature and temperature, respectively, based on the wavelength measurement resolution of 10 pm.     

Investigation on the conformational changes of bovine serum albumin in a wide pH range from 2 to 12

The conformation of bovine serum albumin largely depends on its microenvironment pH and affects its physical functions and applications. In this study, we investigated the effects of pH (wide range 2–12) on the conformation of bovine serum albumin based on spectroscopic signals by various spectroscopic means including fluorescence, synchronous fluorescence, resonance light scattering, UV-visible absorption, and circular dichroism. The changes in spectroscopic signals, such as peak position and intensity, showed that the structure of bovine serum albumin varied significantly with pH. The conformation of bovine serum albumin was compact at pH 6–7, as indicated by the largest peak position values and peak intensities in the fluorescence, synchronous fluorescence, and RLS spectra. The structure of bovine serum albumin became loose in the acidic or alkaline environment, as indicated by the decreased peak position values and peak intensities. The microenvironment of the amino acid residues of bovine serum albumin also varied with pH, as indicated by the changing peak position values. At pH 7, the hydrophobicity of the tyrosine and tryptophan residues was the weakest, as indicated by the minimum synchronous fluorescence signals. In addition, the secondary structure of bovine serum albumin, especially α-helix, varied with pH. The content of α-helix reached the maximum value of 68% at pH 6–8, whereas it decreased in the acidic or alkaline environment. The study provides valuable details for studying the physiological function and applications of serum albumins.     

A controlled quantum teleportation scheme of an N-particle unknown state via three-particle W1 states

In this paper a controlled quantum teleportation scheme of an N-particle unknown state is proposed when N groups of three-particle W1 states are utilized as quantum channels. The quantum information of N-particle unknown state is transmitted from the sender to the recipient under the control of all supervisors. It can be realized with a certain probability. After the sender makes Bell-state measurements and the supervisors perform the computational basis measurements, the recipient will introduce auxiliary particles and carry out unitary transformations depending on classical information from the sender and the supervisors. Finally, the computational basis measurement will be performed by the recipient to confirm whether the teleportation succeeds or not. The successful completion of the scheme relies on all supervisors＇ cooperation. In addition, the fidelity and security of the scheme are discussed.