RLINK: Deep reinforcement learning for user identity linkage

World Wide Web - User identity linkage is a task of recognizing the identities of the same user across different social networks (SN). Previous works tackle this problem via estimating the pairwise...     

基于驾驶适应性的运输机驾驶舱CATIA人因工程分析

在我国大型运输机的研制过程中,有必要对飞机的驾驶舱进行基于驾驶适应性的人因工程分析和设计,为飞行员提供一个舒适、安全、省力的驾驶环境。以建立的驾驶舱显示面板与操纵台模型和驾驶员标准坐姿人体模型为基础,通过对飞行员对操纵杆操作、飞行员控制台可达性分析和飞行员视野模拟给出了基于驾驶适应性的运输机驾驶舱CATIA人因工程分析和仿真。     

45钢表面激光熔覆Ni/WC性能研究

研究了在45钢表面激光熔覆Ni60合金时,WC对熔覆层组织性能的影响,分析了Ni/WC配比对熔覆层显微硬度、耐磨性及金相组织结构的影响。结果表明,采用Ni60+30%WC合金粉末进行激光熔覆时,能得到显微硬度和耐磨性俱佳的熔覆层。     

测速雷达中的谱分析技术

介绍了测速雷达中的谱分析技术，分析了其测速精度和速度分辨率，讨论了ＦＦＴ运算对杂波和噪声的抑制作用。     

A MEMS sandwich differential capacitive silicon-on-insulator accelerometer

A differential capacitive accelerometer with simple process is designed, simulated, and fabricated. To achieve a precision structure dimension with fewer processing steps, the silicon device layer transfer technology is being used to built a sandwich accelerometer based on a silicon-on-insulator (SOI) wafer, which was assembled by glass-si-glass multilayer anodic bonding. Deep reactive ion etching is being used to define symmetric beams and large mass block of equal thickness together in SOI device layer (up to 100 μm) in a single step to avoid alignment error in double side process. An actual accelerometer which is designed for 50 g measure range is fabricated with six lithography steps. Measurement results show 0.1166 V/g sensitivity and 0.022 % nonlinearity error in ±1 g gravity static response test. The accelerometer also provides a power spectrum less than 10.49 μVrms/Hz^1/2 (89.97 μg/Hz^1/2) in a non-isolated laboratory environment with a capacitive interface circuit.     

Role of oleic acid coating in the heterogeneous uptake of dimethylamine by ammonium sulfate particles

Reactive uptake by ammonium (NH₄⁺) salts is one of the major pathways for the gas-to-particle partitioning of alkyl amines. Recent studies using particles of individual ammonium salts and mixtures with hydrophilic organics have revealed that the degree of amine uptake depends on the phase state of ammonium salts, the particulate water contents and particle viscosity. The role of hydrophobic organic compounds, another important category of particulate organics commonly detected in the ambient atmosphere, in amine uptake remains unknown. Here we report the uptake of dimethylamine (DMA) by ammonium sulfate (AS) particles coated with fresh or ozone-aged bulk oleic acid (OA) at 60%, 30%, and <5% relative humidities (RHs) using an electrodynamic balance coupled with Raman spectroscopy. OA and DMA were selected to represent hydrophobic organics and alkyl amines, respectively. Over 74% of the original NH₄⁺ ions were displaced due to DMA uptake, except those conditioned at <5% RH. On the other hand, the fresh or aged bulk OA coating retarded DMA uptake by preventing the particle surface from effectively accommodating gaseous DMA molecules. Judging from the estimated DMA uptake coefficients, the retardation gradually intensified as the weight percentage of coating increased before leveling off, likely when the particle surface was completely covered by fresh or aged bulk OA. We propose that the accommodation of DMA on the particle coating is the rate-limiting step of DMA uptake. Intensive aging of the OA coating had little effect on the equilibrium particle-phase compositions but retarded DMA uptake.

© 2017 American Association for Aerosol Research     

Rotatable Aggregation‐Induced‐Emission/Aggregation‐Caused‐Quenching Ratio Strategy for Real‐Time Tracking Nanoparticle Dynamics

Real‐time tracking of the dynamics change of self‐assembled nanostructures in physiological environments is crucial to improving their delivery efficiency and therapeutic effects. However, such tracking is impeded by the complex biological microenvironment leading to inhomogeneous distribution. A rotatable fluorescent ratio strategy is introduced that integrates aggregation‐induced emission (AIE) and aggregation‐caused quenching (ACQ) into one nanostructured system, termed AIE and ACQ fluorescence ratio (AAR). Following this strategy, an advanced probe, PEG^5k‐TPE₄‐ICGD₄ (PTI), is developed to track the dynamics change. The extremely sharp fluorescent changes (up to 4008‐fold) in AAR allowed for the clear distinguishing and localization of the intact state and diverse dissociated states. The spatiotemporal distribution and structural dynamics of the PTI micelles can be tracked, quantitatively analyzed in living cells and animal tissue by the real‐time ratio map, and be used to monitor other responsive nanoplatforms. With this method, the dynamics of nanoparticle in different organelles are able to be investigated and validated by transmission electron microscopy. This novel strategy is generally applicable to many self‐assembled nanostructures for understanding delivery mechanism in living systems, ultimately to enhance their performance in biomedical applications.     

X80管线钢在新洲土壤中腐蚀的电化学噪声

采用电化学工作站测试了X80管线钢在不同含水率的新洲土壤中的电化学噪声,并对噪声数据进行了谱图和频域分析。结果表明:含水率对X80管线钢在新洲土壤中的腐蚀影响较大,在低含水率(14%)和中间含水率(18%)新洲土壤中,腐蚀以点蚀为主,在高含水率(22%)土壤中以均匀腐蚀为主;随着含水率从14%增加到22%,电化学噪声谱的噪声波动持续的时间缩短;X80管线钢发生均匀腐蚀时,其功率谱密度(PSD)图高频线性段斜率较大,与腐蚀初期相比变化较大,且出现高频白噪声;当X80管线钢发生点蚀时,其PSD图高频线性段斜率较小,与腐蚀初期相比变化不大。     

高延性混凝土加固钢筋混凝土柱抗震性能试验研究

为研究高延性混凝土（HDC）加固混凝土柱的受力性能,设计了8个RC柱,采用HDC和高性能复合砂浆进行加固,通过低周反复荷载试验,研究其破坏形态、变形和耗能能力。试验结果表明：采用HDC围套加固混凝土柱,可对核心区混凝土形成较好的约束作用,破坏形态由脆性破坏向延性破坏转变,加固柱的承载力、延性和耗能能力都得到显著提高;HDC加固层能与混凝土较好地协调工作,可充分发挥HDC的高耐损伤能力,其加固效果明显优于高性能复合砂浆钢筋网加固;在HDC加固层配置钢筋网,可提高加固层对内部混凝土的约束作用,进一步提高加固柱的延性和耗能能力,但对其承载力的贡献较小;采用HDC围套式加固混凝土柱,可减轻竖向构件的损伤程度,提高其抗震性能。     

玉竹的研究开发现状与展望

玉竹作为一种药、食两用草本植物,具有独特的营养与保健功能,近几年来受到了人们的广泛关注.本文综述了国内10余年来玉竹的研究开发进展与现状,并对玉竹的深度开发研究作了展望.