微动图和能量的方法在微动研究中的应用

介绍了微动的两种研究方法：微动图和能量的方法。归纳了微动图的组成、分类、作法及其在减轻微动损伤方面的作用。讨论了能量的方法在微动摩擦学研究中的应用，包括微动磨损体积与摩擦过程中释放的总能量的关系及能量分布在解释微动实验现象中的成功运用。最后指出微动摩擦学的研究仍然面临巨大挑战。     

Red AIE Luminogens with Tunable Organelle Specific Anchoring for Live Cell Dynamic Super Resolution Imaging

Lysosomes and mitochondria play an important role in maintaining cell homeostasis. Visualizing the long-term activities of lysosomes and mitochondria on the nanometer scale in live cells is essential for further understanding their functions but remains challenging due to the limitations of existing fluorescent probes, such as aggregation-caused quenching (ACQ) effect, limited signal-to-noise ratio from fluorescence “always on” in the process of targeting organelle and poor photobleaching resistance. Herein, two efficient red-emitting aggregation-induced emission (AIE) luminogens are reported, which showed “off-on” fluorescence characteristic and specific lysosomes as well as mitochondria targeting capability. Owing to their AIE characteristics, a Stokes’ shift larger than 100 nm, good biocompatibility, and excellent photostability, the AIE luminogens have been successfully utilized for high fidelity imaging of lysosomes and mitochondria. By virtue of these two probes, stimulated emission depletion (STED) images of dynamic lysosomal fusion and mitochondrial fission with a high resolution of 65.6 nm are obtained. Furthermore, the interactions between lysosomes and mitochondria in the process of mitophagy are recorded. This study also provides practical guidance for designing specific organelle targeting probes to support live cell dynamic super-resolution imaging.     

锂锰氧化物离子筛及其研究进展

详细介绍了国内外锂锰氧化物离子筛的研究现状和发展前景，重点介绍了目前较为热点的结构理论、作用机理和造粒等问题，对离子筛应用可能存在的溶损问题也提出了自己的见解。     

国产袖珍DT-8888型4(1/2)位多功能数字万用表的工作原理与设计

本文介绍了国产袖珍式DT-8888型4(1/2)位多功能数字万用表的主要功能与技术指标,并结合主体电路工作原理的分析,讨论了具体电路的设计。     

Impact of fillers and counterface topography on wear behavior of PTFE polymers for ultrasonic motor

Aimed to study the effects of reinforcing or functional fillers on mechanical and tribological properties of PTFE‐based friction materials of ultrasonic motor, carbon fibers reinforced PTFE composites modified with different functional fillers with differences in dimension, size, and hardness are fabricated. The tribological performances of PTFE‐based friction materials are comparatively investigated under different sliding velocities and normal loads on different surface morphologies, respectively. The experimental results reveal that nano‐SiO₂ shows excellent performance in improving friction stabilities and wear resistance in different operating conditions. It is believed the silica‐based tribofilms, higher deformation resistance, and bearing capacity play a key role in improving friction stabilities. Furthermore, the results also show that the surface topography plays an important role in wear properties. The lower wear rate (sliding against with the disordered surface) is believed to be attributed to wear debris easy‐store characteristic of the topography, which promotes transfer films formation and decreases the wear rate effectively. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44835.     

Facile one-step precursor-to-aerogel synthesis of silica-doped alumina aerogels with high specific surface area at elevated temperatures

Silica-doped alumina aerogels offer the potential alternative to the applications as thermal insulators, catalysis, or catalytic support at elevated temperatures. However, the production process of silica-doped alumina aerogels was complicated and time-consuming. We developed a one-step precursor-to-aerogel method of silica-doped alumina aerogels with high specific surface area and thermal stability. Compared to conventional methods, the developed method reduced time and solvent waste of alumina-based aerogels production. Here, we investigated the alumina aerogels doped with silica to stabilize γ-phase at higher temperatures. XRD, FTIR, TEM, TG-DSC, and BET analysis results showed that silica stabilized the γ-Al₂O₃ at 1200 °C. The stabilization mechanism analysis showed that silica addition could significantly hinder the contact among alumina particles and the formation of necks in the sintering process, thereby retarding the transition of γ–θ phase and maintaining the high specific surface area at elevated temperatures. Silica and alumina particles formed mullite at 1200 °C, which could suppress α-phase transformation. In addition, silica-doped alumina aerogels exhibited the high specific surface area of 311 m²/g at 1000 °C and 146 m²/g at 1200 °C when the silica content was in the range of 10.6–13.1 wt%.     

润扬大桥南汊北锚碇深基坑开挖工程实践

介绍了润扬大桥南汊北锚碇深基坑工程开挖实例。该基坑的地层条件为二元结构 ,平均开挖深度为 48m。围护结构采用1.2m厚的地下连续墙和 12道内支撑及 3 2根立柱桩 ,结合地连墙底的双排注浆帷幕来挡土和止水 ,在距离地连墙 2 3m处进行了水平高喷形成了外部封水帷幕。基坑内共布置有 6口深井 ,基坑外布置有双排降水井进行坑内外降水。深基坑工程施工监测表明 ,该基坑设计合理 ,为今后类似工程设计施工积累了宝贵的实践经验     

北京英国使馆旧址整体平移工程设计与实施

英国使馆旧址建于1903年，属国家一级文物，因建设需要拟将该建筑物向东南方向平移，还要避让古树。本工程是国内目前历史最久、规模最大、文物级别最高的砖木结构建筑物平移工程，行走路线下有人防、地下通道及地下室，建筑物纵向刚度差，正立面整体性较差，平移过程中需多次转向。针对这些特点和难点，对房屋加固、移位路线和方式及各相关体系进行了周密的设计，平移到位后房屋原有裂缝没有扩大，也未发现新的裂缝，位置偏差在10mm内。     

长壁采场覆岩空间结构探讨

基于微地震定位监测技术监测岩休在三维空间破裂的成果，以及多种边界条件工作面岩层运动和应力场的观测结果，提出长壁采场覆岩空间结构的概念，并根据采场的边界条件．将覆岩空间结构分为中间育支撑的“e”型、中间无支撑的“O”型、“S”型和“C”型4类。基于观测实例，阐述微地震定位监测技术用于监测窄间结构的形成过程和范围、采空区边缘煤体内应力计用于反演综采放顶煤采场中间无支撑空间结构内部的覆岩运动、“孤岛”煤体应力计用于判断中间有支撑空间结构煤柱变形方式等多种观测方法及这些方法在覆岩空间结构研究中的综合应用途径。最后，展望覆岩空间结构学术观点及其研究方法在采矿工程中的应用前景。     

三峡库区奉节河段库岸蓄水再造研究

通过二维水流泥沙数模计算，分析了三峡库蓄水后棒节河段的泥沙淤积量、流场、近岸流速及浪高等的变化；探讨了岸坡可能的3种再造形式；冲刷塌岸、整体滑移、岩坡崩塌；建立了库岸冲刷塌岸的预测模型，并进行了预测；计算分析了不同水位、冲刷淤积、地震等工况下典型滑坡的稳定性变化规律；最后，对库岸再造的工程防治措施提出了建议。