3D printing-assisted combinatorial approach for designing mechanically-tunable and vascular supportive nanofibrous membranes to repair perforated eardrum

Perforation of eardrum or tympanic membrane (TM) is a common clinical condition, which occurs due to infection or injury of the eardrum, and could results in varying degrees of conductive hearing loss among all ages. In this study, the authors report the combinatorial approach of designing mechanically-tunable and vascular supportive nanofibrous membranes by 3D printing-assisted electrospinning (e-spin) using polycaprolactone (PCL) and gelatin with different mass ratios suitable to repair a perforated eardrum. The physicochemical, mechanical, and biological properties of the membranes were characterized. The results show that the membrane has nanofibrous morphology with fibers are of varying size (400–600 nm in diameter) depending on processing conditions. The wettability and mechanical properties of the membrane can be tuned by regulating the gelatin content. Moreover, a biomimetic repair strategy inspired by chicken eggshell membrane, often used in wound dressings, was also presented for study and results show that the suture retention strength of the fabricated membrane can meet clinical translational requirements to promote TM healing. The vascular cell responsiveness of PCL/gelatin nanofibrous membrane was evaluated using human umbilical vein endothelial cells (HUVECs) and the results showed satisfactory biocompatibility, vascular cell responsiveness, and cell proliferation. The findings of this study demonstrate that the combinatorically engineered PCL/gelatin nanofibrous membrane has great potential for repairing perforated eardrum.     

基于传播心理学的新型冠状病毒肺炎防疫信息科普图形设计与应用

基于传播心理学的新型冠状病毒肺炎防治信息科普图形设计的简介性与有效性、共通性与沟通性、特色性与共鸣性的创作定位。展开新型冠状病毒肺炎防疫信息科普的图形设计,探索传播心理学下,特殊防治信息科普图形的色彩研究、元素研究和表现手法研究。实现互联网新媒体时代下防疫信息图形的传播媒介、传播受众、传播场所的具体应用剖析。立足艺术设计专业加强防疫符号辨识,形成积极防疫心理暗示,助推新型冠状病毒肺炎疫情防治及舆情宣传的传播效应。     

定轴转动的均质圆盘附加压力的完整计算

刚体作定轴转动运动时，由于安装不善会导致刚体偏离动平衡状态，因此对定轴转动的均质圆盘作用于轴承上的附加压力在最一般情况下进行了计算。计算结果清楚地表明：附加压力的大小与转动角速度的平方成正比，方向随时间作周期性变化。通常的计算结果均可作为一种特例而包含于本文讨论中所得的一般结果之中。     

散射通信用频率综合器

论文介绍用于散射通信的几种模块化频率综合器方案及相位噪声计算结果。列举了不同频段、不同相位噪声的频率综合器实例及其选择。     

钨钼分离方法的研究进展

对钨冶炼中钨和钼分离方法的研究进展进行了概述     

浅析库-鄯输油管线首站耗电情况

库尔勒泵站是为库-鄯管线提供输油压力的唯一泵站，主泵耗电量占全线耗电量的75％以上，针对主泵的不同运行工况，分析了其耗能情况。指出该站的输油单耗与输油主泵的转速及排量密切相关，在满足工艺参数及排量要求的情况下，主泵进行低转速运行较为经济。     

Modeling of passively Q-switched Er/sup 3+//Yb/sup 3+/-codoped clad-pumped fiber lasers

We present the modeling of passively Q-switched Er/sup 3+//Yb/sup 3+/-codoped double-clad fiber lasers (EYDFL). Both two-level and three-level saturable absorbers (SAs) are used. The model is based on detailed rate equations of SAs, Er/sup 3+/, and Yb/sup 3+/ populations in the fiber, and light propagation equations including spontaneous emissions due to both Er/sup 3+/ and Yb/sup 3+/. Laser output characteristics including pulse energy, width, peak power, repetition frequency (PRF), and average power are computed as functions pump power, fiber length, single-mode/multi-mode fibers, Er/sup 3+//Yb/sup 3+/ concentrations, out-coupling reflectivity, focus area on the SA, and SA doping and length. Several transition metal-doped crystal SAs and semiconductor SA mirrors (SESAM) are considered and compared.     

聚吡咯纳米粒子的制备与应用

综述了导电性聚吡咯纳米粒子的制备方法、特殊性能与应用。     

电供热发展简析

指出电直接供热是能源的低效应用，但可以作为其他供热方式的补充或用于建筑局部供热。认为热泵和电蓄能供热是电供热的发展方向，提出要增强建筑节能和提高供热系统管理水平，倡导冷热电联供和多能源综合利用。