激光偏振拉曼的CVD多晶石墨烯表征

石墨烯具有优异的物理化学性质,在MEMS器件、光电检测材料、柔性显示屏、新能源电池、复合材料等方面成为研究热点。目前大面积石墨烯制备主要依赖于化学气相沉积技术(chemical vapor deposition, CVD),但其生长的晶体质量直接影响到电化学特性和实际应用,因此需要一种快速而准确的表征方法。实验利用背向散射的偏振激光散射装置测量CVD生长的石墨烯拉曼光谱。通过分析实验获得的300 nm SiO2/Si基底上的单层、五层和十层左右的石墨烯角分辨偏振拉曼光谱,发现单层生长的石墨烯偏振特性与机械剥离单晶石墨烯一致;随着层数的增加,G峰偏振响应差异更加明显,表现出明显的椭圆特性;在不同石墨烯层数上的D峰也呈现出一定的偏振响应差异性。偏振拉曼测试结果表明目前CVD生长的缺陷和多晶特性与石墨烯层数呈现正相关特征。     

基于模糊控制的中压异步电机软启动控制器的研究设计

本文介绍了一种基于模糊控制的中压异步电动机软起动器的原理和软硬件设计。根据对电动机起动特性的分析,提出了基于模糊控制的中压电动机软起动的设计方法。通过检测输入电流,在电动机起动过程中,在恒流平滑升压下有效的消除了启动过程中的电流振荡问题,以达到最佳的起动效果。     

The Golden Touch by Light: A Finely Engineered Luminogen Empowering High Photoactivatable and Photodynamic Efficiency for Cancer Phototheranostics

Photoactivatable agent is a powerful tool in biomedicine studies due to high-precision spatiotemporal control of light. However, those previously reported agents generally suffer from short wavelength, fluorescence self-quenching effect, and the lack of photosensitizing property, which severely restrict their practical applications. To address these issues, molecular engineering of 1,4-dihydropyridine derivatives is conducted to obtain an optimized agent, namely TPA-DHPy-Py, which exhibits low oxidation potential, high photoactivation efficiency, and excellent type I/II combined photodynamic activity. Concurrently, its photoactivated counterpart is featured by aggregation-induced near-infrared emission and remarkable reactive oxygen species (ROS) production efficiency. Upon photoactivation, TPA-DHPy-Py is capable of precisely identifying cancer cells from co-culturing cancer cells and normal cells without the assistance of any extra targeting units, and in situ monitoring lipid droplets and endoplasmic reticulum alteration under ROS stress, as well as achieving fluorescent visualization of tumor in vivo with supremely high imaging contrast. Furthermore, the unprecedented performance on photodynamic cancer therapy is demonstrated by the significant inhibition of tumor growth. Therefore, the photoactivatable TPA-DHPy-Py with dual-organelle-targeted and excellent photodynamic activity associated with self-monitoring ability is highly promising for cancer theranostics in clinical trials.     

Study of Ka-band TM01 to TE11 Mode Converters with Parallel Input and Output Waveguides

Based on the bent waveguide mode coupling theory, a combined TM₀₁-TE₁₁ mode converter with parallel input and output ports is designed by numerical calculation with the phase rematch technology employed. A numerical calculation comparison between the converter and another double-arc TM₀₁-TE₁₁ mode converter with nonparallel input and output ports shows that the former has obvious advantages over the latter in conversion, bandwidth and compact. Good agreement between tests and calculations shows the converter meets the application well.     

电磁波生物学效应实验的要素

本文讨论电磁波生物学效应实验的要素.实验要素是指在实验中应控制且在实验报告中应给出的参数和条件.实验要素是评价实验结论合理性和可靠性的重要依据.     

光电子器件封装中微位移传感器的设计与仿真

在光电子器件封装中,光纤组件和阵列波导芯片之间微小位移的检测对封装效率有很大的影响。分析了目前光电子封装存在的问题,并对几种位移测量方法进行了比较,提出了基于电阻应变式一维位移传感器结构。首先,对位移传感器结构进行了理论上的分析,得到了微位移与应变的关系式;然后,采用 ANSYS有限元分析软件对传感器的结构的进行仿真分析,得到位移与应变之间的仿真值;最后,把理论上的分析值与仿真得到的结果进行比较分析。结果表明,新型传感器能够检测微米级位移,通过优化弹性薄片的结构和改变施力点的位置,可以有效的提高传感器的灵敏度。     

Application of infrared spectroscopy and partial least-squares for modeling the correlation of bitumen dynamic shear rheological with temperature

This paper reported a method for determining the correlation of the physical properties and the chemical composition of bitumen. The double-log model of dynamic shear modulus with temperature was performed for linearization treatment to obtained the constants, which were served as the independent variables using in partial least-squares(PLS) regression. In addition, infrared spectra were processed by data pretreatment methods and served as dependent variables in PLS. The regression vector b of PLS made possible the observation of the spectral regions contributing in the modeling, which provided a basis for research of the correlation between physical properties and chemical composition of bitumen.     

用FPGA实现PDH到SDH的高阶映射

本文介绍了自主设计开发的Ｅ４到ＳＴＭ－１的转换，给出了实验系统的方框图及构成，讨论了关键技术及测试结果。     

荧光寿命成像显微技术

介绍荧光寿命成像显微（FLIM）技术及其在生物物理、生物化学及临床医学诊断等领域的最新研究成果和发展现状，并就其未来的发展及应用研究进行了讨论。     

成岩史模拟与成岩阶段预测——以黄骅坳陷碳酸盐岩为例

通过在时空领域内模拟镜质组反射率、古地温、伊/蒙混层中蒙皂石层含量和甾烷异构化率的变化，建立了碳酸盐岩成岩作用数值模拟系统。模拟结果表明，黄骅坳陷奥陶系碳酸盐岩在加里东期处于早成岩阶段，海西期-印支期处于中成岩阶段A期，燕山期进入中成岩阶段B期。古近纪-现今，奥陶系下部碳酸盐岩一直处于晚成岩阶段，但中、上部地层仍处于中成岩阶段。目前，在黄骅坳陷的北部和南部地区，奥陶系碳酸盐岩进入中成岩阶段B期，有利于天然气的生成与聚集；中部地区则处于中成岩阶段A期，可以生成和聚集液态烃，是石油勘探的有利地区。