联吡啶[3,2-a：2’,3-c]-7-氮杂-吩嗪铜(I)配合物的合成、表征及其与DNA的相互作用

合成了邻菲罗啉衍生物联吡啶[3,2-a:2',3'-c]-7-氮杂-吩嗪(dpapz)及其铜(I)配合物[Cu(dpapz)₂]PF₆, 利用核磁共振氢谱(¹H NMR), 傅里叶变换红外(FTIR)光谱, 高分辨质谱(HR ESI-MS)等对合成的化合物进行了表征.采用紫外-可见吸收光谱,荧光光谱, DNA熔解温度实验和循环伏安方法研究了dpapz和[Cu(dpapz)₂]PF₆与小牛胸腺DNA(CT DNA)的相互作用. 配体dpapz与小牛胸腺DNA(CT DNA)作用时未观察到吸收峰红移并且减色效应较小(<30%), 且DNA熔解温度也上升较小(ΔT_m=7.8 ℃), 说明dpapz以沟槽结合的方式与CT DNA相互作用. 而[Cu(dpapz)₂]PF₆与CT DNA作用时, 可观测到较小的吸收峰红移(2-3 nm)和较大的减色效应(>50%), 同时DNA熔解温度上升较大(ΔT_m=11.1 ℃), 表明[Cu(dpapz)₂]PF₆以静电相互作用和部分扦插的方式与DNA结合. 溴乙锭(EB)荧光竞争实验和循环伏安实验进一步证实了这一结论. 配体dpapz和[Cu(dpapz)₂]PF₆与DNA的结合常数分别为2.88×10⁵和5.32×10⁵ mol·L^-1. 光照条件下, [Cu(dpapz)₂]PF₆产生单重态氧的能力与dpapz相当, 但产生超氧负离子自由基的能力要弱于dpapz. 活性氧猝灭实验表明, 超氧负离子自由基、单重态氧和羟基自由基均参与了dpapz和[Cu(dpapz)₂]PF₆对DNA的光损伤作用. [Cu(dpapz)₂]PF₆对DNA的亲和性要高于对dpapz的, 使得[Cu(dpapz)₂]PF₆对质粒DNA的光损伤效率明显强于dpapz.     

Diffraction mode selection in planar Bragg resonators of optical and microwave wavelength ranges

Using the coupled waves approach complemented by the time-domain quasi-optical approximation, we solve a 2D diffraction problem which allows to evaluate the eigenfrequencies, quality factors and spatial structures of eigenmodes in planar Bragg resonators with a finite length and width of the corrugated area. We find the values of the Fresnel parameter determined by the geometrical dimensions of the system which allows for efficient transverse mode discrimination due to the larger diffraction losses of the modes with higher transverse numbers.     

Broadband mode converter and multiplexer based on dielectric-loaded plasmonic waveguides

We theoretically demonstrate a broadband mode converter and multiplexer based on plasmonic waveguides loaded with structured dielectrics. The proposed device can realize conversions between a fundamental TM₀ mode and a first order TM₁ mode, as well as (de)multiplex them with another TM₀ mode. Our design exhibits as wide as 400 nm bandwidth and as short as 6~7 μm coupling length. This work has potential application in high density photonic integrated devices for both computing and communication applications.     

Incremental dynamic mode decomposition: A reduced-model learner operating at the low-data limit

The present work aims at proposing a new methodology for learning reduced models from a small amount of data. It is based on the fact that discrete models, or their transfer function counterparts, have a low rank and then they can be expressed very efficiently using few terms of a tensor decomposition. An efficient procedure is proposed as well as a way for extending it to nonlinear settings while keeping limited the impact of data noise. The proposed methodology is then validated by considering a nonlinear elastic problem and constructing the model relating tractions and displacements at the observation points.     

连续碳纤维增强的聚芳醚酮复合材料的层间破坏

用双悬臂梁和端开口弯曲试件分别研究了连续碳纤维增强的聚芳醚酮复合材料(CF/PEK-C)的Ⅰ型和Ⅱ型的层间破坏。CF/PEK-C的Ⅰ型层破坏的线弹性断裂判据G_(Ⅰc)和弹塑性断裂判据J_(Ⅰc)分别为0.69KJ/m~2且与裂纹长度无关。CF/PEK-C的Ⅱ型层间破坏的稳定性,与裂纹和半距之比α/L有关。当α/L小于0.7时,表现为不稳定的Ⅱ型层间破坏的断裂韧性G_(Ⅱc)为1.62KJ/m~2。当α/L大于0.7时,则为稳定的Ⅱ型层间破坏。此时的G_(Ⅱc)与临界点的选择有关。由亚临界点和0.95点法得出的G_(Ⅱc)值分别为1.73和2.74KJ.M~2。     

连续碳纤维增强的聚芳醚酮在Ⅰ型循环载荷下的层间破坏

用双悬臂梁(DCB)试件研究了连续碳纤维增强的聚芳醚酮复合材料(CF/PEK-C),在Ⅰ型循环载荷作用下的层间裂纹扩展行为.循环载荷采用载荷控制模式,最小载荷与最大载荷之比为0.5.在疲劳试验中,仍然发现有“阻力曲线”现象存在.层间裂纹扩展速率用指数定律与相应的应变能释放速率联系起来,并对结果进行了讨论.     

武汉大学"化学拔尖计划"的探索与实施

详细介绍了武汉大学"化学拔尖计划"的探索与实施,包括学生的选拔机制、培养模式和管理模式。学生的选拔依照"严入口、小规模、高水平"的原则进行;从课程体系、教学内容、教学方法和评价机制四个方面介绍了学生的培养模式;对学生的管理采用导师制和书院制并行的方式。     

高压换流站交流滤波器组相干噪声源声功率反演

针对高压换流站内交流滤波器组相干噪声源的声功率难以确定的问题,该文提出了一种基于几何声学理论的声功率反演方法。该方法采用可同时考虑噪声源强度和相位的几何声学理论建立相干声场模型,在此基础上构建声功率反演模型,通过寻找使声学模型输出和实测数据差异最小的声源参数(强度和相位),实现了对相干噪声源声功率的反演。数值仿真和实验数据验证了该方法的有效性。