阜阳市儿童预防接种信息系统数字化预防接种门诊试点效果评价

目的：了解依托儿童预防接种信息化系统建立的数字化接种门诊对预防接种工作流程中发挥的效果。方法：采用现况调查和自身前后对照的方法,收集和分析资料。结果：数字化接种门诊实施前后接种流程中各个阶段,差异有统计学意义（t=14.611、t =6.964、t =12.704、t =10.418、t =28.673、t =31.138,P＜0.05）,数字化后的患儿家属满意度高于数字化前,差异有统计学意义（χ2=80.954、χ2=103.156、χ2=4.536、χ2=64.737,P＜0.05）。结论：数字化预防接种门诊能够明显缩短疫苗接种效率并提高儿童家长的满意度。     

基于ADAMS的某型号侧置凸轮轴发动机气门系统的研究

发动机领域现在常用顶置凸轮发动机,但侧置凸轮轴发动机由于其大扭矩的优点在农业机械中仍常使用。文章通过对某型号侧置凸轮轴发动机的气门系统的CAD模型进行分析,研究了气门正时、气门升程等主要参数,并研究了气门弹簧、气门凸轮、气门摇臂和气门等主要部件的受力情况,为本气门系统的实际制造和使用提供了先期数据,便于优化改进。     

Blind identification of a class of nonlinear systems with cyclostationary input

This letter deals with blind identification of nonlinear discrete Hammerstein system under the input signal that is cyclostationary. The first-order moment of the specific input as well as the inverse nonlinear mapping of the Hammerstein model are combined to establish a relationship between the system output and the system parameters, which implies an approach to identifying the system blindly. Simulation results demonstrate the effectiveness of this approach to blind identification of a class of nonlinear systems.     

A Water Stable,Near‐Zero‐Strain O3‐Layered Titanium‐Based Anode for Long Cycle Sodium‐Ion Battery

Layered transition metal (TM) oxides of the stoichiometry Na_xMO₂ (M = TM) have shown great promise in sodium‐ion batteries (SIBs); however, they are extremely sensitive to moisture. To date, most reported titanium‐based layered anodes exhibit a P2‐type structure. In contrast, O3‐type compounds are rarely investigated and their synthesis is challenging due to their higher percentage of unstable Ti³⁺ than the P2 type. Here, a pure phase and highly crystalline O3‐type Na_0.73Li_0.36Ti_0.73O₂ with high performance is successfully proposed in SIBs. This material delivers a reversible capacity of 108 mAh g^?1 with a stable and safe potential of 0.75 V versus Na/Na⁺. In situ X‐ray diffraction reveals that this material does not undergo any phase transitions and exhibits a near‐zero volume change upon Na⁺ insertion/de‐insertion, which ensures exceptional long cycle life over 6000 cycles. Importantly, it is found that this O3‐Na_0.73Li_0.36Ti_0.73O₂ shows superior moisture stability, even when immersed into water, which are both elusive for conventional layered TM oxides in SIBs. It is believed that the small interlayer distance and high occupation of interlayer vacancy promise such unprecedented water stability.     

高度取向ZnO薄膜的介电和光波导特性研究

用溶胶凝胶法在不同的基片上制备了具有高度 ｃ 轴即（００２）取向的 Ｚｎ Ｏ 薄膜,研究了溶剂、稳定剂等对合成的先体溶液的影响。对薄膜的 Ｘ Ｒ Ｄ 分析表明随热处理温度的增加,ｃ 轴取向度增大,并且薄膜的晶粒尺寸在 ３００ ° Ｃ～５００ ° Ｃ 范围内增幅较大。用端面耦合的方法测量了制备在 Ｓｉ Ｏ２／ Ｓｉ（１１１）基片上薄膜的波导损耗,即随热处理温度的增加,波导损耗增大,主要来源于 Ｚｎ Ｏ 薄膜与 Ｓｉ Ｏ２ 的界面及晶粒的散射。制备在 Ｐｔ／ Ｓｉ Ｏ２／ Ｓｉ（１１１）基片上薄膜的相对介电常数为 ７～１３,电阻率则为 １．７×１０４ Ω·ｃｍ ～９．８×１０５ Ω·ｃｍ 。     

Salt‐Assisted Growth of P‐type Cu9S5 Nanoflakes for P‐N Heterojunction Photodetectors with High Responsivity

P‐n junctions based on two dimensional (2D) van der Waals (vdW) heterostructure are one of the most promising alternatives in next‐generation electronics and optoelectronics. By choosing different 2D transition metal dichalcogenides (TMDCs), the p‐n junctions have tailored energy band alignments and exhibit superior performance as photodetectors. The p‐n diodes working at reverse bias commonly have high detectivity due to suppressed dark current but suffer from low responsivity resulting from small quantum efficiency. Greater build‐in electric field in the depletion layer can improve the quantum efficiency by reducing recombination of charge carriers. Herein, Cu₉S₅, a novel p‐type semiconductor with direct bandgap and high optical absorption coefficient, is synthesized by salt‐assisted chemical vapor deposition (CVD) method. The high density of holes in Cu₉S₅ endows the constructed p‐n junction, Cu₉S₅/MoS₂, with strong build‐in electric field according to Anderson heterojunction model. Consequently, the Cu₉S₅/MoS₂ p‐n heterojunction has low dark current at reverse bias and high photoresponse under illumination due to the efficient charge separation. The Cu₉S₅/MoS₂ photodetector exhibits good photodetectivity of 1.6 × 10¹² Jones and photoresponsivity of 76 A W^?1 under illumination. This study demonstrates Cu₉S₅ as a promising p‐type semiconductor for high‐performance p‐n heterojunction diodes.     

RS485通信最优波特率研究

在RS485总线中,主机和从机通常使用固定的波特率进行通信;而在实际应用中,波特率的大小和传输的距离是成反比的,波特率越高传输的距离越短,误码率增加越大。为避免波特率过高通信不可靠的问题,根据硬件波特率自适应的机制,文章采用从机数量来计算最优的波特率的方式进行主从机通信。经过实验验证,可提高RS485通信系统的稳定性。     

飞机防冰控制器测试系统的设计

本设计基于模拟测试技术和计算机控制技术,介绍了飞机防冰控制器测试系统的软件和硬件电路。本系统采用QT作为软件开发平台,STM32F103ZET6为硬件控制器,使用RS485作为通信方式来实现飞机防冰控制器的自动测试、实时分析、故障排除等功能。     

Efficient Terahertz Plasmonic Absorbers with V-Grooves Using Highly Doped Silicon Substrate and Simple Wet-Etching Techniques

We experimentally demonstrate that at terahertz frequencies perfect plasmonic absorbers made from a 3D V-groove array in a highly doped silicon wafer can be easily realized using simple wet-etching process. The surface plasmon modes can be excited by the V-groove array and get decayed when they propagate along the silicon surface and enter the grooves, inducing a broadband near-zero dip in the reflection spectra. The reflection spectrum of the fabricated absorber is characterized using a terahertz time-domain spectroscopy system, and the experimental results are in good agreement with numerical simulations. The high performance including high absorptivity and large bandwidth together with the easy fabrication processes presented in this paper make this plasmonic absorber promising for a wide range of practical applications in terahertz regime.