The anti-jamming method based on front-back-edge tracking of VGPO jamming

2016 ◽  
Author(s):  
Liping Wu ◽  
Xiongjun Fu ◽  
Shiliang Liu ◽  
Shuilian Peng ◽  
Min Xie
Keyword(s):  
Edge Tracking ◽  
Back Edge

Wolf's Syndrome in Twins — Translocation in The Mother

1976 ◽  
Vol 25 (1) ◽  
pp. 267-270 ◽  
Author(s):  
M. Lévy ◽  
B. Noel ◽  
D. Viola
Keyword(s):  
Cervical Vertebrae ◽  
The Body ◽  
Chromosome 4 ◽  
Back Edge ◽  
Intellectual Level ◽  
Mz Twins

A case of MZ twins, both affected by Wolf's syndrome, is described. Their mother, of subnormal look and low intellectual level is translocated. The children, born with a weight and size much below the average, show a very special morphotype: a hook-nose, an abnormal conformation of the back edge of the nostrils (a protrusion in the shape of a horn overhanging the filtrum), hypertelorism, microcephaly. Great asynchronism in the maturation of the bones and a somatoschisis of the body of the cervical vertebrae are noted. Deletion of the short arm chromosome 4 is juxtacentromeric. The study of blood and tissue groups corroborates monozygosity. Dermatoglyphs are little abnormal and identical in the two children. The mother's family is phenotypically normal. At 19 months of age, measuring is still below 4, psychomotor progress is extremely weak, and convulsions are frequent.

Automatic seam-line determination for orthoimage mosaics using edge-tracking based on a DSM

2017 ◽  
Vol 8 (10) ◽  
pp. 977-986 ◽  
Author(s):  
Maoteng Zheng ◽  
Xiaodong Xiong ◽  
Junfeng Zhu
Keyword(s):  
Edge Tracking

Position and Attitude Control of Underactuated Drones Using the Adaptive Function Approximation Technique

2020 ◽  
Author(s):  
Azin Shamshirgaran ◽  
Donald Ebeigbe ◽  
Dan Simon
Keyword(s):  
Disturbance Rejection ◽  
Function Approximation ◽  
Control Method ◽  
System Stability ◽  
Linear Feedback ◽  
Approximation Technique ◽  
Adaptive Function ◽  
Edge Tracking ◽  
Highly Nonlinear ◽  
Function Approximation Technique

Abstract Despite the popularity of drones and their relatively simple operation, the underlying control algorithms can be difficult to design due to the drones’ underactuation and highly nonlinear properties. This paper focuses on position and orientation control of drones to address challenges such as path and edge tracking, and disturbance rejection. The adaptive function approximation technique control method is used to control an underactuated and nonlinear drone. The controller utilizes reference attitude signals, that are derived from a proportional derivative (PD) linear feedback control methodology. To avoid analytic expressions for the reference attitude velocities, we employ a continuous-time Kalman filter based on a model of the measurement signal — which is derived by passing the reference attitude position through a low-pass signal differentiator — as a second-order Newtonian system. Stability of the closed loop system is proven using a Lyapunov function. Our design methodology simplifies the control process by requiring only a few tuning variables, while being robust to time-varying and time-invariant uncertainties with unknown variation bounds, and avoids the requirement for the knowledge of the dynamic equation that governs the attitude of the drone. Three different scenarios are simulated and our control method shows better accuracy than the proportional-derivative controller in terms of edge tracking and disturbance rejection.

Staring target edge tracking

1995 ◽  
Author(s):  
Jian Wu ◽  
Lianhe He
Keyword(s):  
Edge Tracking

Guidelines and Limitations of the Compact Compression Specimen

2019 ◽  
Author(s):  
David J. Plechaty ◽  
Kevin T. Carpenter ◽  
John P. Parmigiani
Keyword(s):  
Carbon Fiber ◽  
Test Specimen ◽  
Loading Rate ◽  
Material Models ◽  
Damage Initiation ◽  
Matrix Compression ◽  
Initiation And Propagation ◽  
Back Edge ◽  
Notch Length ◽  
Compression Damage

Abstract Damage initiation and propagation material models for carbon fiber composites can be categorized according to the loading applied to constituent components. An example of such categorization is fiber tension, fiber compression, matrix tension, and matrix compression material models. Of these, matrix compression has been by far the least studied based on amount of published literature. Recent work at Oregon State University (OSU) has begun to address this lack of study. OSU researchers have published several papers culminating in the specification of an effective test specimen for isolating matrix compression damage initiation and propagation in carbon fiber laminates. While providing compelling results indicating the effectiveness and usefulness of this test specimen, little or no information has been provided regarding its manufacture, usable notch lengths, and optimum loading rate during testing. Experience at OSU has shown that this information is critical and not trivial to obtain. The purpose of this paper is to provide specific guidelines and “lessons learned” needed for other researchers to efficiently and effectively use this specimen in a comprehensive study. Test specimens are manufactured in the OSU Composites Materials Manufacturing Laboratory using typical commercial pre-peg carbon fiber following the specified layup and curing procedures. Once the material was cured the carbon fiber plate was then water-jet cut into the desired geometry and notch length. Usable notch length and optimum loading rate was determined by testing a series of specimens. All testing was conducted at an OSU lab using a universal testing machine with Digital Image Correlation (DIC) data collected. Specimens were preloaded and matrix compression initiation and propagation data collected until tensile failure occurred on the back edge of the specimen. Testing showed that shorter notch lengths result in inconsistent data and longer in effective initiation but limited propagation due to reduced ligament length. Testing suggested that a speed less than 5 mm/min gave the best results as faster displacement rates caused less crack propagation to occur, while increasing the likelihood of the specimen to fail in tension along its back edge. Through the use of these guidelines, researchers are able to manufacture and use an effective test specimen for the investigation of matrix compression damage initiation and propagation.

Explicit Equations for the Stresses beneath a Sliding Spherical Contact

1983 ◽  
Vol 197 (1) ◽  
pp. 53-59 ◽  
Author(s):  
G M Hamilton
Keyword(s):  
Hertzian Contact ◽  
Spherical Contact ◽  
Back Edge ◽  
Explicit Formulae

Explicit formulae have been developed for the stresses beneath a sliding, normally loaded Hertzian contact. As friction rises a region of impending failure develops in the back edge of contact.

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