电位型聚吡咯pH传感器的制备

电位型聚吡咯pH传感器的制备;聚吡咯; pH传感器; 电化学聚合; 交流阻抗     

α-和β-四烷氧取代酞菁的合成及性能研究

利用3-烷氧取代邻苯二腈和4-烷氧取代邻苯二腈与相应的金属盐反应制备了两大系列(α-和β-)四烷氧取代酞菁.讨论了温度对中间体烷氧取代邻苯二腈合成的影响,探讨了酞菁的两种环合方法,并对β-烷氧酞菁的环合历程进行了初步的考察.研究了不同取代位置和酞菁的最大吸收波长之间的关系,结果表明, α-取代烷氧取代酞菁导致λmax红移值较大,而相应β位取代情况下红移值较小,说明给电子基团在α位对酞菁骨架的π共轭结构微扰作用比β位大.同时研究了溶解度及热失重与酞菁结构的关系.     

旋转物体温度的非接触检测原理

本文讨论了利用交流电桥作感温部件及旋转变压器原理实验对旋转体温度的非接触检测。     

钙钛矿/硅异质结叠层太阳电池:光学模拟的研究进展

近几年,钙钛矿/硅异质结叠层太阳电池发展迅速,效率已经从13.7％提升到29.1％.由于叠层电池器件的制作工艺复杂,而叠层太阳电池中的光学损失对转换效率的影响很大,所以通过光学模拟进而获得高效电池至关重要.本文首先从商业软件和自建模型两方面概述了光学模拟的方法,接着从反射损失和寄生吸收两方面针对光学模拟研究进展进行了总...     

Mixed Conduction in BaCe0.8Pr0.2O3-α Ceramic

BaCe0.8Pr0.2O3-α ceramic was synthesized by high temperature solid-state reaction. The structural characteristics and the phase purity of the crystal were determined using powder X-ray diffraction analysis. By using the methods of AC impedance spectroscopy, gas concentration cell and electrochemical pumping of hydrogen, the conductivity and ionic transport number of BaCe0.8Pr0.2O3-α were measured, and the electrical conduction behavior of the material was investigated in different gases in the temperature range of 500-900 ffiC. The results indicate that the material was of a single perovskite-type orthorhombic phase. From 500 ffiC to 900 ffiC, electronic-hole conduction was dominant in dry and wet oxygen, air or nitrogen, and the total conductivity of the material increased slightly with increasing oxygen partial pressure in the oxygen partial pressure range studied. Ionic conduction was dominant in wet hydrogen, and the total conductivity was about one or two orders of magnitude higher than that in hydrogen-free atmosphere (oxygen, air or nitrogen).     

Research on Multi-Terminal’s AC Offloading Scheme and Multi-Server’s AC Selection Scheme in IoT

Mobile Edge Computing (MEC) technology and Simultaneous Wireless Information and Power Transfer (SWIPT) technology are important ones to improve the computing rate and the sustainability of devices in the Internet of things (IoT). However, the system models of most relevant papers only considered multi-terminal, excluding multi-server. Therefore, this paper aims at the scenario of IoT with multi-terminal, multi-server and multi-relay, in which can optimize the computing rate and computing cost by using deep reinforcement learning (DRL) algorithm. Firstly, the formulas of computing rate and computing cost in proposed scenario are derived. Secondly, by introducing the modified Actor-Critic (AC) algorithm and convex optimization algorithm, we get the offloading scheme and time allocation that maximize the computing rate. Finally, the selection scheme of minimizing the computing cost is obtained by AC algorithm. The simulation results verify the theoretical analysis. The algorithm proposed in this paper not only achieves a near-optimal computing rate and computing cost while significantly reducing the program execution delay, but also makes full use of the energy collected by the SWIPT technology to improve energy utilization.     

Electrochemistry of Tetrathiafulvalene Ligands Assembled on the Surface of Gold Nanoparticles

The synthesis of a tetrathiafulvalene (TTF) derivative, S-[4-({4-[(2,2′-bi-1,3-dithiol-4-ylmethoxy)methyl] phenyl}ethynyl)phenyl] ethanethioate, suitable for the modification of gold nanoparticles (AuNPs), is described in this article. The TTF ligand was self-assembled on the AuNP surface through ligand exchange, starting from dodecanethiol-stabilized AuNPs. The resulting modified AuNPs were characterized by TEM, UV-Vis spectroscopy, and electrochemistry. The most suitable electrochemical method was the phase-sensitive AC voltammetry at very low frequencies of the sine-wave perturbation. The results indicate a diminishing electronic communication between the two equivalent redox centers of TTF and also intermolecular donor–acceptor interactions manifested by an additional oxidation wave upon attachment of the ligand to AuNPs.     

Fe对掺钕磷酸盐激光玻璃激光性能的影响

 在理论分析的基础上,具体讨论了Fe质量分数小于10^-4对1 053 nm处光吸收损耗和Nd³⁺无辐射跃迁几率的影响规律,发现Fe在1 053 nm处的光吸收损耗和Nd³⁺无辐射跃迁能量转移都与Fe质量分数成平方关系增长, Fe对1 053 nm光吸收的影响较大而Fe与Nd³⁺之间的能量转移不足50 Hz。这对生产过程中Fe含量的控制有重要指导意义。     

太赫兹波段折叠波导行波管的线性分析和计算

给出了太赫兹波段折叠波导行波管中考虑管壁欧姆损耗的带电子束扰动的色散方程。求解该方程可以得到器件中小信号增益的值。通过编制Matlab程序,分析计算了不同工作点、不同折叠波导结构参数和不同工作频段时小信号增益的变化特性。计算结果表明：适当选取工作点和结构参数,可以获得最佳增益值;考虑损耗后,除了前向增长的辐射场外,还会出现反向传输的静态波;随着工作频段向高频方向延伸,前向波的增益显著降低,而反向波强度则增大。因此,工作频率提高时,为了达到一定大小的增益,需要的折叠波导的周期数也相应增加。     

添加金属氧化物的V2O5/AC在烟气脱SO2及脱SO2后H2再生制备硫磺的活性研究

干法脱除烟气SO2的多种催化剂均可在H2气氛中再生,直接制备硫磺。该过程的实现不仅要求再生尾气循环,而且要求催化剂具有双重功能,即在脱硫过程中催化氧化SO2为H2SO4以及在再生过程中将催化还原释放出的SO2进一步转化为硫磺。添加有金属氧化物的V2O5/AC催化剂具备双重功能。着重考察了添加Ce、W、Fe、Co 等氧化物的V2O5/AC催化剂烟气SO2脱除能力及脱除SO2后经H2再生制备硫磺的能力,并对添加Co的催化剂进行了优化。结果表明,在这类催化剂中,对烟气脱SO2起主要催化氧化作用的是V2O5,对H2再生硫磺制备起作用的是添加的金属氧化物。除Ce2O3外,WO3、Fe2O3和CoO都提高了再生中的硫磺收率,CoO的作用最为显著。较合适的催化剂组成是1%V2O5和0.5%CoO。这些金属氧化物在AC上的担载方法,对烟气脱SO2和H2再生结果的影响不明显。硫磺的生成需要CoO向CoS2的转变,再生后催化剂上残余有部分CoS2,且残余硫量还与V2O5量有关。