Results 91 to 100 of about 105,553 (280)

Detecting high indoor crowd density with Wi-Fi localization: a statistical mechanics approach

Journal of Big Data, 2019
We address the problem of detecting highly raised crowd density in situations such as indoor dance events. We propose a new method for estimating crowd density by anonymous, non-participatory, indoor Wi-Fi localization of smart phones.
Sonja Georgievska, Philip Rutten, Jan Amoraal, Elena Ranguelova, Rena Bakhshi, Ben L. de Vries, Michael Lees, Sander Klous   +7 more
doaj   +1 more source

Curvature‐Tuned Friction at Electrified Ionic Liquid Interfaces

Advanced Functional Materials, EarlyView.
Graphene curvature plays a key role in friction electrotunability at single‐asperity contacts lubricated by ionic liquids. A 9 nm radius yields stronger tunability than larger radii, with distinct friction coefficients at low and high loads indicating a shift in the slippage plane.
Wei Song, Md Ashiqur Rahman, Qianlu Zheng, Nathaniel Hawthorne, James D. Batteas, Rui Qiao, Rosa M. Espinosa‐Marzal   +6 more
wiley   +1 more source

A Realistic and New Approach for Crowd Density, Quantity, Types, and Anomaly Detection Using Effective Multi-Task Deep Learning Model

IEEE Access
Quantitative, type, and anomaly information in crowd videos is critical for smart city and campus applications. Existing approaches generally focus on high-performance counting or anomaly detection within the scope of crowd analysis.
Turan Goktug Altundogan, Selen Gurbuz, Mehmet Karakose   +2 more
doaj   +1 more source

Structural and Chemical Engineering of Sub‐Nanochannel Membranes Toward Ion Selectivity

Advanced Functional Materials, EarlyView.
This review summarizes recent advances in structural and chemical engineering of sub‐nanochannels for ion selectivity. We first introduce fundamental ion transport mechanisms within sub‐nanochannels, followed by strategies to tune pore size, geometry, and surface functionalities, categorized into charge‐based, ion‐recognition, hydrophilic bonding, and ...
Yuyu Su, Huacheng Zhang, Tamar L. Greaves, Qi Han, Weiwei Lei, Dan Liu   +5 more
wiley   +1 more source

L2HCount:Generalizing Crowd Counting from Low to High Crowd Density via Density Simulation

Since COVID-19, crowd-counting tasks have gained wide applications. While supervised methods are reliable, annotation is more challenging in high-density scenes due to small head sizes and severe occlusion, whereas it's simpler in low-density scenes. Interestingly, can we train the model in low-density scenes and generalize it to high-density scenes ...
Xu, Guoliang, Yin, Jianqin, Zhang, Ren, Dang, Yonghao, Zhou, Feng, Yu, Bo   +5 more
openaire   +2 more sources

Extracting Crowd Velocities at High Density

Collective Dynamics, 2020
Velocity is a fundamental property of foot traffic flow. Monitoring the change of velocity patterns at high pedestrian densities may provide valuable insights on foot traffic dynamics. In this paper, a closer look is taken to explore the capability of the Particle Image Velocimetry (PIV) technique on extracting crowd velocities from surveillance camera
Baqui, Muhammad, Löhner, Rainald
openaire   +3 more sources

Silicified Wood‐Inspired, High‐Strength Fire‐Resistant Chitin‐Based Aerogels for Sustainable High‐Temperature Thermal Insulation

Advanced Functional Materials, EarlyView.
Inspired by natural silicified wood, a biomimetic mineralized chitin‐derived aerogel is constructed. It can withstand 81 000 times its own weight, and its backside temperature is 130.4°C after exposure to ∼1300°C butane flame for 600 s, exhibiting high‐strength, fire‐resistance, and super thermal‐insulation properties.
Kai Xu, Qihang Lv, Lubin Liu, Zhezhe Zhou, Chentao Yan, Ao Qin, Jianting Ma, Shuhui Liang, Yue Xu, Min Hong, Bin Li, Pingan Song   +11 more
wiley   +1 more source

Semantic Video Analytics Framework using SpinalXNet for Crowd Management in Large Public Events [PDF]

ITM Web of Conferences
In recent years, crowd management (CM) in large public events, such as concerts, sports gatherings, and festivals, has become increasingly critical for ensuring safety and preventing accidents.
P Shreedevi, Mohana H.S., Nazim Abdul Sattar Khalid, Kumar S Pradeep, Dhandayuthapani V Bala   +4 more
doaj   +1 more source

Interfacial Adsorption Engineering Enables a Highly Utilized Zinc Anode With 99.9% Coulombic Efficiency

Advanced Functional Materials, EarlyView.
When hydrated zinc ions are deposited onto Cu substrates at practical current densities, the modified Cu enables simultaneously compact zinc growth and suppressed hydrogen evolution. This regulatory effect originates from the superior adsorption of the modified Cu interface, which enhances zincophilicity and the hydrogen desorption barrier, thereby ...
Zhe Zhu, Xiaoqiao Liao, Yihao Long, Mengmeng Yang, Ibrahem O. Baibars, Ruiqi Song, Zhun Shi, Liang He, Chuan Zhao   +8 more
wiley   +1 more source

Intelligent Anomaly Detection and Localization With Crowd Density Estimation for Improved Public Safety

IEEE Access
The rapid growth of metropolitan populations and large public gatherings has increased the need for intelligent surveillance systems capable of ensuring public safety.
Deevesh Chaudhary, Sunil Kumar, Vijaypal Singh Dhaka   +2 more
doaj   +1 more source