“黄-解方法”低成本合成有机半导体明星构筑单元螺芴氧杂蒽

螺芴氧杂蒽(SFX)是有机/高分子半导体材料的明星单元,在构筑发光、电荷传输与俘获材料领域应用广泛。早期SFX母体仅能通过邻卤二芳基法多步合成,2006年,黄维、解令海(黄-解)偶然发现了SFX的一锅法合成工艺,有效解决了非平面有机半导体构筑单元合成步骤复杂的问题,并进一步拓展制备了氮杂芴和含氮的螺环结构,最终形成了螺芴杂蒽类的“黄-解方法”。该方法有着步骤简单、产率高与成本低的优点,被MIT材料合成化学家高度评价和日本科学家以人名称谓,被多个领域的同行普遍采用,工业界凭借黄-解方法的高效性成功实现了SFX的量产。目前,SFX已经替代螺二芴(SBF)被学术界、工业界广泛应用,特别是韩国LG公司将其应用于有机发光二极管(OLED)显示技术。     

高选择性快速检测Cu2+的水杨酰腙型探针的合成及在逻辑门和吸附中的应用

以4-溴代三苯胺、5-甲醛基呋喃-2-硼酸和水杨酰肼为原料,设计合成了一种新型的可快速识别Cu2+的席夫碱类荧光探针分子(HJW-2),并通过1H NMR,13C NMR和HR-MS对其结构进行了表征.基于分子内电荷转移机理(ICT),HJW-2展现出优异的溶剂效应,对Cu2+具有快速识别、高选择性和专一性,检测限低至...     

CINRAD/SB雷达伺服系统典型故障分析

介绍金华CINRAD/SB天气雷达天线、伺服系统的组成及基本工作原理,根据金华新一代天气雷达伺服系统出现的故障记录以及报警信息,分析故障原因,确定故障部位,给出解决方案及注意事项,为雷达机务人员在碰到类似问题时快速确定故障位置并解决故障提供参考,共享雷达维护维修经验,提高工作效率,更好地保障新一代天气雷达的正常运行.     

Enhanced performances of InGaN/GaN-based blue light-emitting diode with InGaN/AIInGaN superlattice electron blocking layer

InGaN/AIlnGaN superlattice （SL） is designed as the electron blocking layer （EBL） of an InGaN/GaN-based light- emitting diode （LED）. The energy band structure, polarization field at the last-GaN-barrier/EBL interface, carrier concen- tration, radiative recombination rate, electron leakage, internal quantum efficiency （IQE）, current-voltage （l-V） perfor- mance curve, light output-current （L-l） characteristic, and spontaneous emission spectrum are systematically numerically investigated using APSYS simulation software. It is found that the fabricated LED with InGaN/AIInGaN SL EBL exhibits higher light output power, low forward voltage, and low current leakage compared with those of its counterparts. Meanwhile, the efficiency droop can be effectively mitigated. These improvements are mainly attributed to the higher hole injection efficiency and better electron confinement when InGaN/AIlnGaN SL EBL is used.     

Amperometric Sensor Based on Neutral Red-Doped Silica Nanoparticles Coupled with Microdialysis for the Measurement of Glutamate in the Rat Striatum

Amperometric sensor based on neutral red-doped silica （NRSiO2） nanoparticles （NPs） was fabricated and coupled with a microdialysis sampling system




















































































































































































































































































for the detection of glutamate （Glu） in the rat striatum. The NRSiO2 NPs [about （45 ± 3） nm] were prepared with water-in-oil （W/O） microemulsion method, and characterized by transmission electron microscope （TEM） technique. The neutral red （NR） doped in silica network could maintain its high electroactivity and behave as an excellent electron mediator for electrocatalysis of hydrogen dioxide. Furthermore, the silica surface could prevent the leakage of NR, hence, the stability of biosensor was improved. The novel Glu biosensor showed a linear range from 5.0×10^-7 to 1.5×10^-4 mol/L, with a detection limit of 2.0×10^-7 mol/L （S/N=3）.     

多重开孔式声子晶体隔声特性研究

设计了一种多重开孔式局域共振声子晶体结构,结合有限元方法计算结构的带隙和隔声特性,并进一步分析了影响隔声效果的因素.结果表明,该结构在41～1500 Hz范围内存在一个较宽的完全带隙和两个较宽的方向带隙.隔声峰出现的位置与带隙频率范围相对应.通过增加内部金芯体的半径,减小包覆层硅橡胶孔的尺寸,可以取得更好的隔声效果.通过在结构中新增一层复合层,可使整体结构的隔声性能进一步优化.     

矩形喷口欠膨胀超声速射流对撞的实验研究

在不同喷口间距和射流压力下开展了矩形喷口欠膨胀超声速射流对撞实验并与自由射流进行了对比. 实验表明:超声速射流对撞的辐射噪声中存在四种不同的啸音模式, 且随喷口距离和射流压力的变化在不同模式间切换. 在射流压力大于0.5 MPa且喷口间距小于50 mm时, 射流对撞面在两个喷口外形成两道正激波之间, 啸音基频维持在3 kHz左右. 随喷口间距的增大或射流压力的降低, 射流对撞面在一侧喷口外的弓形激波与另一侧喷口外的正激波之间. 对撞面也有可能出现在两个弓形激波之间, 对应的啸音基频约为9 kHz, 但容易受扰动而回到喷口一侧或是在喷口之间大幅度振荡. 当射流压力小于0.36 MPa且喷口间距大于70 mm后, 对撞面在两个喷口之间大幅度振荡, 产生基频在1 kHz左右并随射流压力的降低和喷口间距的增大而降低的啸音. 关键词： 超声速射流 啸音 射流对撞 激波     

基于液相外延的InAs基红外探测器InAsSbP阻挡层的仿真

在传统pn结红外探测器中,宽带隙阻挡层的引入可以有效降低器件暗电流。采用COMSOL软件对探测器的能带图进行仿真,结果表明,InAsSbP四元合金通过n型或p型掺杂,其能带结构能够实现价带能级的下凹或导带能级的上凸,起到阻挡空穴或电子的作用。通过理论分析和仿真计算,确定了满足阻挡层要求的InAsSbP组分。对于nBip型和pBin型红外探测器,仿真得到了阻挡层的最优厚度和最优掺杂浓度(粒子数浓度),并分析了其偏离最优值时对器件暗电流的影响。对于nBip型探测器,当阻挡层厚度为40nm、掺杂浓度为2×10~(18) cm~(-3)时,器件开关比最大;对于pBin型探测器,当阻挡层厚度为60nm、掺杂浓度为4×10~(17) cm~(-3)时,器件的开关比最大。     

Efficient quantum simulation of open quantum dynamics at various Hamiltonians and spectral densities

Simulation of open quantum dynamics for various Hamiltonians and spectral densities are ubiquitous for studying various quantum systems. On a quantum computer, only log₂N qubits are required for the simulation of an N-dimensional quantum system, hence simulation in a quantum computer can greatly reduce the computational complexity compared with classical methods. Recently, a quantum simulation approach was proposed for studying photosynthetic light harvesting [npj Quantum Inf. 4, 52 (2018)]. In this paper, we apply the approach to simulate the open quantum dynamics of various photosynthetic systems. We show that for Drude–Lorentz spectral density, the dimerized geometries with strong couplings within the donor and acceptor clusters respectively exhibit significantly improved efficiency. We also demonstrate that the overall energy transfer can be optimized when the energy gap between the donor and acceptor clusters matches the optimum of the spectral density. The effects of different types of baths, e.g., Ohmic, sub-Ohmic, and super-Ohmic spectral densities are also studied. The present investigations demonstrate that the proposed approach is universal for simulating the exact quantum dynamics of photosynthetic systems.