Investigation of the distribution of secondary particles associated with high-energy hadron collisions by means of the straight-line path approximation

1972 ◽  
Vol 10 (1) ◽  
pp. 7-12
Author(s):  
B. M. Barbashov ◽  
S. P. Kuleshov ◽  
V. A. Matveev ◽  
V. N. Pervushin ◽  
A. N. Sisakyan
Keyword(s):  
High Energy ◽  
Secondary Particles ◽  
Straight Line ◽  
Path Approximation ◽  
Energy Hadron ◽  
Line Path

Straight-line particle path approximation for high-energy hadron scattering in quantum field theory

1970 ◽  
Vol 5 (3) ◽  
pp. 1183-1192 ◽  
Author(s):  
B. M. Barbashov ◽  
S. P. Kuleshov ◽  
V. A. Matveev ◽  
V. N. Pervushin ◽  
A. N. Sisakyan ◽  
...  
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
High Energy ◽  
Quantum Field ◽  
Particle Path ◽  
Straight Line ◽  
Path Approximation ◽  
Energy Hadron

Vector field path following of a full-wing solar-powered Unmanned Aerial Vehicle (UAV) landing based on Dubins path: a lesson from multiple landing failures

2021 ◽  
pp. 1-30
Author(s):  
A. Guo ◽  
Z. Zhou ◽  
R. Wang ◽  
X. Zhao ◽  
X. Zhu
Keyword(s):  
Vector Field ◽  
Path Following ◽  
Endurance Performance ◽  
Electrical Energy ◽  
Lateral Control ◽  
Special Configuration ◽  
Straight Line ◽  
Lateral Distance ◽  
Solar Powered ◽  
Line Path

Abstract The full-wing solar-powered UAV has a large aspect ratio, special configuration, and excellent aerodynamic performance. This UAV converts solar energy into electrical energy for level flight and storage to improve endurance performance. The UAV only uses a differential throttle for lateral control, and the insufficient control capability during crosswind landing results in a large lateral distance bias and leads to multiple landing failures. This paper analyzes 11 landing failures and finds that a large lateral distance bias at the beginning of the approach and the coupling of base and differential throttle control is the main reason for multiple landing failures. To improve the landing performance, a heading angle-based vector field (VF) method is applied to the straight-line and orbit paths following and two novel 3D Dubins landing paths are proposed to reduce the initial lateral control bias. The results show that the straight-line path simulation exhibits similar phenomenon with the practical failure; the single helical path has the highest lateral control accuracy; the left-arc to left-arc (L-L) path avoids the saturation of the differential throttle; and both paths effectively improve the probability of successful landing.

Fabrication of circular cooling channels by cold metal transfer based wire and arc additive manufacturing

2021 ◽  
pp. 095440542199561
Author(s):  
Shaohua Han ◽  
Zhongzhong Zhang ◽  
Pengxiang Ruan ◽  
Shiwen Cheng ◽  
Dingqi Xue
Keyword(s):  
Additive Manufacturing ◽  
High Energy ◽  
Cooling Effect ◽  
High Deposition Rate ◽  
Cooling Channel ◽  
Conformal Cooling Channel ◽  
Conformal Cooling ◽  
Energy Beam ◽  
Cooling Channels ◽  
Straight Line

Additive manufacturing has been proven to be a promising technology for fabricating high-performance dies, molds, and conformal cooling channels. As one of the manufacturing methods, wire and arc additive manufacturing displays unique advantages of low cost and high deposition rate that are better than other high energy beam-based ones. This paper presents a preliminary study of fabricating integrated cooling channels by CMT-based wire and arc additive manufacturing process. The deposition strategies for fabricating circular cross-sectional cooling channels both in conformal and straight-line patterns have been investigated. It included optimizing the welding torch angle, fabricating the enclosed semicircle structure and predicting the collision between the torch and constructed part. The cooling effect test was also conducted on both the conformal cooling channel and straight-line cooling channel. The results affirmed a higher cooling efficiency and better uniform cooling effect of the conformal cooling channel than straight-line cooling channel.

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