Results 11 to 20 of about 76,204 (254)

Identifiability Analysis for Configuration Calibration in Distributed Sensor Networks

Remote Sensing, 2022
In this work, the parameter identifiability of sensor position perturbations in a distributed network is analyzed through establishing the link between rank of the Jacobian matrix and parameter identifiability under Gaussian noise.
Xiaoyu Liu, Tong Wang, Jinming Chen
doaj   +1 more source

Research on a Dynamic Calibration Method for Photogrammetry Based on Rotary Motion

Applied Sciences, 2023
Photogrammetry as an engineering measurement technology for the rapid and non-contact acquisition of geometric parameters, such as the attitude, position, and shape of a measured object, is widely used in the development and production processes of the ...
Jia Ou, Tingfa Xu, Xiaochuan Gan, Xuejun He, Yan Li, Jiansu Qu, Wei Zhang   +6 more
doaj   +1 more source

Investigation into Macro- and Microcrack Propagation Mechanism of Red Sandstone under Different Confining Pressures Using 3D Numerical Simulation and CT Verification

Geofluids, 2021
The growth and evolvement features of crack are of great significance to study the failure mechanism of rock mass and valuate the stability of the cavity.
Wen Zhang, Yan-yu Chen, Jin-ping Guo, Sai-sai Wu, Cheng-yuan Yan   +4 more
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External Validation of the Kidney Failure Risk Equation and Re-Calibration with Addition of Ultrasound Parameters [PDF]

Clinical Journal of the American Society of Nephrology, 2016
Progression of CKD toward ESRD is heterogeneous. The Kidney Failure Risk Equation (KFRE) was developed to identify CKD patients at high risk of ESRD. We aimed to externally validate KFRE and to test whether the addition of predefined Duplex ultrasound markers - renal resistive index (RRI) or difference of resistive indices in spleen and kidney (DI-RISK)
Claudia S, Lennartz, John William, Pickering, Sarah, Seiler-Mußler, Lucie, Bauer, Kathrin, Untersteller, Insa E, Emrich, Adam M, Zawada, Jörg, Radermacher, Navdeep, Tangri, Danilo, Fliser, Gunnar H, Heine   +10 more
openaire   +2 more sources

Method for Determining Elements of Internal Orientation Calibration in Multi-Matrix Optoelectronic Devices

Наука и техника, 2020
In the operation schemes of optical electronic devices (OED), such as digital autocollimators, direction finders, Shack-Hartmann sensors, as well as astro-orientation systems, projection measuring systems, geometric calibration schemes for OED, the photo-
M. A. Starasotnikau, I. V. Padskrebkin, R. V. Feodortsau   +2 more
doaj   +1 more source

Multi-Lidar System Localization and Mapping with Online Calibration

Applied Sciences, 2023
Currently, the demand for automobiles is increasing, and daily travel is increasingly reliant on cars. However, accompanying this trend are escalating traffic safety issues.
Fang Wang, Xilong Zhao, Hengzhi Gu, Lida Wang, Siyu Wang, Yi Han   +5 more
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Camera Calibration using the Damped Bundle Adjustment Toolbox [PDF]

ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2014
Camera calibration is one of the fundamental photogrammetric tasks. The standard procedure is to apply an iterative adjustment to measurements of known control points. The iterative adjustment needs initial values of internal and external parameters.
N. Börlin, P. Grussenmeyer
doaj   +1 more source

A Stereo-Vision System for Measuring the Ram Speed of Steam Hammers in an Environment with a Large Field of View and Strong Vibrations

Sensors, 2019
The ram speed of a steam hammer is an important parameter that directly affects the forming performance of forgers. This parameter must be monitored regularly in practical applications in industry.
Ran Chen, Zhongwei Li, Kai Zhong, Xingjian Liu, Yonghui Wu, Congjun Wang, Yusheng Shi   +6 more
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Calibration of Large-Scale Spatial Positioning Systems Based on Photoelectric Scanning Angle Measurements and Spatial Resection in Conjunction with an External Receiver Array

Applied Sciences, 2020
Positioning systems providing high-precision real-time measurements over very large spatial scales are urgently required for large-scale industrial manufacturing applications.
Chunbao Xiong, Hongzhi Bai
doaj   +1 more source

Simulation of internal nitrogen release from bottom sediments in an urban lake using a nitrogen flux model

Water Science and Engineering, 2023
Nutrient release from sediment is considered a significant source for overlying water. Given that nutrient release mechanisms in sediment are complex and difficult to simulate, traditional approaches commonly use assigned parameter values to simulate ...
Ran Gong, Hui-ya Wang, Zhi-xin Hu, Yi-ping Li   +3 more
doaj   +1 more source