Results 11 to 20 of about 725,399 (259)
Constraints on axions from cosmic distance measurements
Journal of High Energy Physics, 2022 Axion couplings to photons could induce photon-axion conversion in the presence of magnetic fields in the Universe. This conversion could impact various cosmic distance measurements, such as luminosity distances to type Ia supernovae and angular ...
Manuel A. Buen-Abad, JiJi Fan, Chen Sun
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Performance of an Ultrasonic Ranging Sensor in Apple Tree Canopies
Sensors, 2011 Electronic canopy characterization is an important issue in tree crop management. Ultrasonic and optical sensors are the most used for this purpose. The objective of this work was to assess the performance of an ultrasonic sensor under laboratory and ...
Alexandre Escolà +8 more
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A vectorial tree distance measure [PDF]
Scientific Reports, 2021 Abstract A vectorial distance measure for trees is presented. Given two trees, we define a Tree-Alignment (T-Alignment). We T-align the trees from their centers outwards, starting from the root-branches, to make the next level as similar as possible.
Avner Priel, Boaz Tamir
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Sensors, 2018 Kinematic laser scanning with moving platforms has been used for the acquisition of 3D point clouds of our environment for many years. A main application of these mobile systems is the acquisition of the infrastructure, e.g., the road surface and ...
Erik Heinz +3 more
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Clinical determination of the occlusal plane and its relation with orofacial measurements [PDF]
Al-Rafidain Dental Journal, 2007 Aims: To determine the level and angulation of the occlusal plane of the artificial dental arch by measuring the level and angulation of the occlusal plane of completely dentulous subjects and to find the relation of these measurements to some of the ...
Zeina M Ahmad +2 more
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Research on an improved leader-follower cooperative navigation technology [PDF]
Zhihui kongzhi yu fangzhen, 2023 To improve the positioning accuracy of the followers in leader-follower cooperative navigation algorithm for multi-USVs based on distance measurement, this algorithm integrates the distance measurements between the followers into the traditional leader ...
CHEN Dongyu
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Enhancing Multi-Distance Phase Retrieval via Unequal Interval Measurements
Photonics, 2021 In the conventional methods of multi-distance phase retrieval, the diffraction intensity patterns are recorded at equal intervals, which can induce slow convergence or stagnation in the subsequent reconstruction process.
Cheng Xu +6 more
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A Novel Three-Head Ultrasonic System for Distance Measurements Based on the Correlation Method
Measurement Science Review, 2014 A novel double-emitter ultrasonic system for distance measurements based on the correlation method is presented. The proposed distance measurement method may be particularly useful in difficult conditions, e.g.
Gądek Krzysztof +2 more
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Aircraft positioning using multiple distance measurements and spline prediction
Aviation, 2022 During the crucial phases of take-off, initial climb, approach, and landing where aircraft are close to the ground, Global Navigation Satellite Systems (GNSS) signal strength may not be sufficient to guarantee safe operation, especially in the presence ...
Ivan Ostroumov +2 more
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Kompariranje in kalibriranje elektronskih tahimetrov : Comparison and Calibration of Electronic Distance Meters [PDF]
Geodetski Vestnik, 2003 All measuring instruments are subject to errors. Due to their characteristics random errors cannot be influenced and with instrument calibration they cannot be eliminated.
Florjan Vodopivec, Dušan Kogoj
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