scholarly journals Concept of Short-Range Radar and Counter-Projectile for Detecting and Countering Armour-Piercing Projectiles

Author(s):  
Adam RUTKOWSKI ◽  
Adam KAWALEC ◽  
Józef JARZEMSKI

During warfare and acts of terrorism an extreme threat to vehicles and other high-value assets comes from armour-piercing projectiles. Under these conditions, defence systems should include devices capable of rapid detection of these threats. Defence assets should also be provided with counter-projectile systems capable of destroying incoming armour-piercing projectiles at a safe distance from the asset to be protected. This paper describes the concept of a system comprising of a lightweight short-range radar and a counter-projectile for countering armour-piercing projectiles. The purpose of the radar is to monitor the environment and search for incoming armour-piercing projectiles. When an armour-piercing projectile is detected in a designated monitoring area, an automatic command is given for the counter-projectile launcher to be fired. The counter-projectile deployed can be equipped with a single or multi-sensor detection head unit and an explosive payload module, both being the primary components of the warhead. When the signal analysis blocks interfaced with the detection head determine that the armour-piercing projectile to be struck down is in the target position in relation to the counter-projectile deployed, they automatically command the explosive payload module to detonate. The components of the system concept were tested in proving ground conditions. The successful results of these tests confirmed the validity of the solutions initially adopted and the execution of the individual systems.

Robotica ◽  
2019 ◽  
Vol 37 (11) ◽  
pp. 1922-1936 ◽  
Author(s):  
Anoop Sathyan ◽  
Ou Ma

SummaryThis paper introduces an approach of collaborative control for individual robots to collaboratively perform a common task, without the need for a centralized controller to coordinate the group. The approach is illustrated by an application example involving multiple robots performing a collaborative task to achieve a common goal. The objective of this example problem is to control multiple robots that are connected to an object through elastic cables in order to bring the object to a target position. There is no communication between the robots, and hence each robot is unaware of how the other robots are going to react at any instant. Only the information pertaining to the object and the target is available to all the robots at any instant. Genetic fuzzy system (GFS) is used to develop controller for each of the robots. The nonlinearity of fuzzy logic systems coupled with the search capability of genetic algorithms provides a tool to design controllers for such collaborative tasks. A set of training scenarios are developed to train the individual robot controllers for this task. The trained controllers are then tested on an extensive set of scenarios. This paper describes the development process of GFS controllers for dynamic case involving systems consisting of three robots. It is also shown that the GFS controllers are scalable for the more complex systems involving more than three robots.


2016 ◽  
Vol 46 (3) ◽  
pp. 217-236
Author(s):  
Martin Donougho ◽  

Little attention has been paid to Hegel’s version of the sublime. I argue that the sublime plays a very marginal role in the Berlin lectures on aesthetics and on religion; in particular, Hegel ignores the “Romantic” sublime popular among his contemporaries. The sublime he locates in Persian poetry and more properly in Biblical Psalmody. After surveying his various articulations of the sublime, I turn to Hegel’s careful analysis of how the Psalms achieve their peculiar effects and note his focus on the “individual.” Paradoxically, while close to Romantic “subreption” (Kant’s term for subjective projection on objective world or word), their complex play with voice—and Hegel’s explication—both keep a safe distance, I contend. Turning finally to the question of anachronism and the sublime as a historical category, I suggest in a brief postscript how effects analogous to the Psalms’ rhetoric may nevertheless be detected in Terry Malick films.


2021 ◽  
Author(s):  
Hamza Chehili ◽  
Mustapha Bensaada

The emergency of the Covid 19 pandemic has led technology to seek solutions to the different problems caused by the disease. In the monitoring area, connected devices offer new possibilities to a rapid detection and intervention of the new cases. They allow remote diagnostic to infected patients with covid 19 symptoms. However, the heterogeneity of the platform requires applications' developers to develop specific solutions for each platform. In this paper, we propose a cross-platform application that permits developer to use one code to build applications in different platforms. The paper describes the architecture of the application by presenting its three parts: interface screens (UI), data manipulation and authentication implementation. Finally, we show selected screens of an android release as an example.


Emotions describe the physiological states of an individual and are generated subconsciously. They motivate, organize, and guide perception, thought, and action. Emotions can be positive or negative. Negative emotions manifest in the form of depression, anxiety and stress. It is necessary to identify negative emotions of an individual who might be in the need for counseling or psychological treatment. Body signal analysis, handwriting analysis, and psychological assessment are some mechanisms to measure them. In this paper, emotional state is being measured through the person’s handwriting sample analysis and psychological assessment. Psychological assessment is done by using the results of DASS questionnaire attempted by the individual. Convolutional Neural Network (CNN) algorithm is used to find the emotional state of an individual from his/her handwriting sample. Comparative analysis is performed to suggest counseling/medication if required. The final CNN model is formed by using the ensemble method over cross-validation models. The accuracy achieved by the CNN model over the test dataset is 91.25%.


2013 ◽  
Vol 303-306 ◽  
pp. 42-44
Author(s):  
Hai Chen Li

Coal Face Gas Concentration Overrun Is the Leading Cause of China Coal Mine Fatal Gas Explosion Accidents Reasons. Therefore, Research and Development of Rapid Detection of Gas Sensor Can Avoid Gas Explosion Accident Key. this Paper Studies the Al2o3 Nanometer Powder Preparation Technology, by Doping Rare Earth Material so that the Gas Sensor Detection Element Surface Area Was Greatly Improved; its Sensitivity and Stability Are Greatly Improved. According to the Test Results Show that, the Rapid Gas Sensor for Methane Reaction Time Is 6 Seconds, Recovery Time of 8 Seconds.


1992 ◽  
Vol 06 (23n24) ◽  
pp. 3667-3673
Author(s):  
Q.-M. Zhang ◽  
J.-Y Yi ◽  
C.J. Brabec ◽  
E.B. Anderson ◽  
B.N. Davidson ◽  
...  

The results of recent ab initio molecular dynamics studies of C and Al clusters are presented. The simulations have shown that C 60 molecular structure is well preserved in the solid and that the individual C 60 molecules start to rotate at relatively low temperatures. Our results are in very good agreement with NMR, photoemission, and neutron scattering data. At high temperatures C 60 undergoes large amplitude soccerball-rugbyball oscillations, but the cage structure is still preserved. The C 60 isomer containing two pairs of adjacent pentagons has a binding energy only 1.6 eV smaller than that of perfect C 60, but high temperatures and long annealing times are required for the transformation between these two structures. Its activation energy is 5.4 eV. We have also studied the various isomers of C 20, since it could form the smallest possible fullerene. At T=0 , the lowest energy isomer is indeed a dodecohedral structure. However, high temperatures favor the corannulene structure, which is a perfect precursor for the formation of C 60. These results are consistent with the experimental data, since high temperatures are needed for efficient formation of C 60. The atomic and electronic structure and doping properties of semiconducting microtubules have also been investigated. The distortions from the ideal geometries are small in microtubules. Substitutional N and B are effective shallow donors and acceptors, respectively. For Al clusters, we focused on Al 13 and Al 55, which can assume perfect icosahedral and cubic structures. However, the distortions from these ideal structures are substantial. For Al 55, several inequivalent but nearly energetically degenerate structures are found. It is shown that this is due to the short range of the screened interatomic interactions.


Geophysics ◽  
1982 ◽  
Vol 47 (9) ◽  
pp. 1335-1337
Author(s):  
E. A. Nosal

A special case of spontaneous potential (SP) logging, which has a closed‐form solution, will be expressed as a convolutional operation. Such a formal demonstration serves two purposes. First, it separates the individual contribution of the tool from that of the earth. Second, it places this logging device within the mathematical context of signal analysis. The special case for which a closed‐form solution is known is that where all resistivities are equal. Fourier analysis applied to this solution leads to a product of two functions, of which one is identified as the contribution of the earth and the other of the tool.


Proceedings ◽  
2020 ◽  
Vol 49 (1) ◽  
pp. 151
Author(s):  
Benjamin Lallemand ◽  
Christophe Clanet ◽  
Sylvain Blanchard ◽  
Patricio Noriega ◽  
Julien Piscione ◽  
...  

Scrums play a major role in Rugby Union games, and are historically known as a showdown between the two packs of opposing teams, composed of their eight forwards players organized in a 3-4-1 configuration, respectively. We investigate scrum mechanics by working with professional male forward players from Racing 92, a high-level French Rugby club, and measuring the forces they apply on the French Rugby Federation instrumented scrum machine. Signal analysis reveals two major phases in the force production during a scrummaging effort: an impulsive engagement force, and then a force sustained for a few seconds. We experimentally compare individual performances of the engagement phase. We discuss the influence of the mass and the engagement speed of the players, and we introduce the model we are investigating to describe the individual impact on a scrum machine. We expect this model to be the elementary component of a collective model of a pack.


1988 ◽  
Vol 03 (07) ◽  
pp. 1535-1580 ◽  
Author(s):  
EBBE M. NYMAN ◽  
D.O. RISKA

The application of the Skyrme model to the construction of interaction and current operators for nuclear systems is reviewed. The long-range behaviors of these operators are found to agree with results of phenomenological meson theories based on effective chiral Lagrangians. The Skyrme model thus provides a compact method for obtaining long-range parts of such operators, consistent with the usual soft-pion theorems as well as with the requirement of current conservation. Predictions of the short-range parts of the operators remain uncertain due to difficulties in solving the equations of motion for the two-nucleon problem. The usual factorized ansatz for the soliton field of the two-nucleon system does not give sufficient accuracy at short range. The possibility of an improvement which would allow the construction of spin and isospin operators for the individual nucleons is discussed. Finally, the Skyrme model is discussed in the limit of large baryon number.


1991 ◽  
Vol 46 (12) ◽  
pp. 1015-1020 ◽  
Author(s):  
M. Heckele ◽  
R. Bellissent ◽  
A. Brunseh ◽  
P. Lamparter ◽  
S. Steeb

Abstract Sputtered amorphous Fe-Co Tb-films with perpendicular and in-plane magnetic anisotropy were investigated by wide- and small angle neutron scattering. By combination with X-ray data the maxima in the pair correlation function could be attributed to the individual atomic pairs. Thus also partial coordination numbers and a short range order parameter could be determined. Wide angle diffraction revealed that the film with magnetic in-plane anisotropy contained 13 atomic percent hydrogen. The hydrogen incorporation causes substantial changes in the short range order, associated with enhanced formation of Tb-rich clusters, and the in-plane anisotropy. The clustering effect was confirmed by results from small angle scattering with polarized neutrons


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