基于疫情下中职口罩自动化课程的快速搭建及线上学习探究

本文基于疫情下学校延期开学线上教学,以及疫情下行业自动化需求和发展趋势,快速整合了工作室和行业资源,搭建了中职口罩自动化课程框架,并对线上教学提出了应急授课方案和学习方法,明确了学习目标。实践研究表明,课程开发提高了线上教与学的有效性,又能实现学生核心素养培养目标。     

GPRS在供水调度监控系统中的应用

针对当前城市供水调度监控点分布范围广、数量多、距离远的现状，提出了一种基于GPRS技术的城市供水调度监控系统的设计和实现方法。具体描述了监控现场的硬件连接；同时对该技术的应用前景进行了展望。     

GPS全站仪在矿区地质勘探工程测量中的控制应用分析

将GPS定位技术引入我国的地质勘探工程测量中,能够极大程度的提升测绘准确性及地质勘探工作效率。采用GPS全站仪勘测矿区地质,有多种内业计算和外业观测方法,本文对控制测量、少量地质点的定位、测站改正进行了探讨,并分析了GPS全站仪在矿区地质勘探工程测量中实现的高效益、高质量应用效果。     

Multifunctional Up‐Converting Nanocomposites with Smart Polymer Brushes Gated Mesopores for Cell Imaging and Thermo/pH Dual‐Responsive Drug Controlled Release

Multifunctional nanocarriers based on the up‐conversion luminescent nanoparticles of NaYF₄:Yb³⁺/Er³⁺ core (UCNPs) and thermo/pH‐coupling sensitive polymer poly[(N‐isopropylacrylamide)‐co‐(methacrylic acid)] (P(NIPAm‐co‐MAA)) gated mesoporous silica shell are reported for cancer theranostics, including fluorescence imaging, and for controlled drug release for therapy. The as‐synthesized hybrid nanospheres UCNPs@mSiO₂‐P(NIPAm‐co‐MAA) show bright green up‐conversion fluorescence under 980 nm laser excitation and the thermo/pH‐sensitive polymer is active as a “valve” to moderate the diffusion of the embedded drugs in‐and‐out of the pore channels of the silica container. The anticancer drug doxorubicin hydrochloride (DOX) can be absorbed into UCNPs@mSiO₂‐P(NIPAm‐co‐MAA) nanospheres and the composite drug delivery system (DDS) shows a low level of leakage at low temperature/high pH values but significantly enhanced release at higher temperature/lower pH values, exhibiting an apparent thermo/pH controlled “on‐off” drug release pattern. The as‐prepared UCNPs@mSiO₂‐P(NIPAm‐co‐MAA) hybrid nanospheres can be used as bioimaging agents and biomonitors to track the extent of drug release. The reported multifunctional nanocarriers represent a novel and versatile class of platform for simultaneous imaging and stimuli‐responsive controlled drug delivery.     

Deepening Insights into Aggregation Effect of Intermolecular Charge-Transfer Aggregates for Highly Efficient Near-Infrared Non-Doped Organic Light-Emitting Diodes over 780 nm

Though urgently needed, high-efficiency near-infrared (NIR) organic light-emitting diode (OLED) is still rare due to the energy-gap law. Formation of intermolecular charge-transfer aggregates (CTA) with nonadiabatic coupling suppression can decelerate non-radiative decay rates for high-efficiency NIR-OLEDs. However, the aggregation effect of CTA is still not fully understood, which limits the rational design of CTA. Herein, two CTA molecules with a same π-framework but different terminal substituents are developed to unveil the aggregation effect. In highly ordered crystalline states, the terminal substituents substantially affect the molecular packing motifs and intermolecular charge-transfer states, thus leading to distinct photophysical properties. In comparison, in amorphous states, these two CTA demonstrate similar photophysical behaviors and properties due to their similar molecular packing and intermolecular interactions as evidenced by molecular dynamics simulations. Importantly, the formations of amorphous CTA trigger multifunction improvements such as aggregation-induced NIR emission, aggregation-induced thermally activated delayed fluorescence, self-doping and self-host features. The non-doped OLEDs demonstrate NIR emissions centered at 788 and 803 nm, and high maximum external quantum efficiencies of 2.6% and 1.5% with small efficiency roll-off, respectively. This study provides deeper insight into the aggregation effect of CTA and lays a foundation for the development of high-efficiency NIR non-doped OLEDs.     

LTE网络高价值区域识别与分析方法研究

通过对LTE网络中高价值区域的识别与分析,可有效保证网络建设投资合理性、提升网络优化效率、节约各类资源投入。同时,高价值场景是中国移动“五高一地”重点关注的场景类型,但缺乏有效识别手段。本文通过LTE网络信令数据、MR数据、工参数据、经分数据等多维数据源关联分析,充分挖掘了数据价值,建立了价值评估体系,从经济价值和社会价值两个层面对网络发展情况进行多维度评估和分析,实现了高价值区域的聚合与自动生成,开展了区域价值分析,解决了高价值场景识别和规划优化工作中的痛点和难点问题,为提高规划优化投资效率提供了理论指导和技术支撑。     

A quasi-orthogonal group space-time architecture to achieve a better diversity-multiplexing tradeoff

Most existing MIMO (multiput-input multiput-output) schemes optimize only either the diversity gain or the multiplexing gain. To obtain a good tradeoff between these two, the quasi-orthogonal group space-time (QoGST) architecture is proposed, wherein the transmit stream is subgrouped but encoded via an inter-group space-time block encoder, with group interference suppression at the receiver. This paper also considers another combined space-time coding and layered space-time architecture, which we refer to as group layered space-time (GLST), where space-time block coding is employed within each group. Under the assumption of Rayleigh fading and a prior perfect channel state information at the receiver, a performance analysis will demonstrate that both QoGST and GLST can achieve a good diversity-multiplexing tradeoff. QoGST is even superior to GLST. Simulation results will validate our analysis and further show that compared to the existent layered space-time block code (LSTBC) scheme, both QoGST and GLST can achieve a significant performance gain     

Study and formation of 2D microstructures of sapphire by focused ion beam milling

Dry etching of C-plane sapphire wafer has been studied using Ga⁺ focused ion beam milling (FIBM). Due to a much lower milling rate of sapphire compared to GaN, it has been proven that gas-assisted FIBM (GAFIBM) is a necessity. Furthermore, it needs to be determined whether XeF₂- or I₂-GAFIBM can improve the technique. We found that XeF₂-GAFIBM gave the highest milling rate. The obtained enhancement factor of the XeF₂-GAFIBM milling rate compared to FIBM rate varied from 2.3 to 1.2 for the ion beam current in the range 20 pA-1 nA. A favorable milling rate selectivity of sapphire to nickel film of about 1.5 was obtained by XeF₂-GAFIBM at 350 pA. We have successfully fabricated a variety of 2D sapphire-based submicron pillar or hole arrays in regular crystals, quasicrystals and aperiodic symmetries. The nearest neighbor distance was down to 230 nm. The depth achieved was deeper than 400 nm. The air filling factor ranged from 12% to 60%. These sapphire-based 2D microstructures were applied on flip-chip GaN-based light emitting diodes (LEDs) and more than 40% improvement in light extraction was obtained.     

接触热阻对薄板零件表面激光淬火温度场形成影响研究

激光淬火工艺具有节能环保、质量高的优点。研究薄板零件激光淬火时所形成的温度场对将激光淬火应用于薄板零件表面强化的实际工作中具有重要的作用。本文通过对45钢和铸铁HT250之间接触面的接触热阻进行实验测试,通过数据分析得出了相应的接触热阻经验关系式。利用Abaqus软件模拟薄板表面激光淬火,其中将实验所得的接触热阻经验关系式代入,得到了相应薄板表面淬火温度场。通过与不考虑接触热阻的零件表面淬火温度场仿真结果进行对比,得出了接触热阻对薄板零件表面激光淬火所形成的温度场的影响。研究成果可对薄板表面激光淬火工艺应用于实践提供指导。     

新型彩色LCOS头盔微显示器光学系统

通过对实像显示技术和虚像显示技术的区别的简要介绍,阐述了头盔微显示器在未来战场上对数字化士兵的重要作用以及头盔微显示技术的研发意义。通过对LCOS头盔微显示器显示原理的阐述,着重介绍了一种新型彩色LCOS头盔微显示器整个光学系统设计方面的最新研究成果。