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Author

Johan Gallant

Other affiliations: Atomic Energy of Canada Limited
Bio: Johan Gallant is an academic researcher from Royal Military Academy. The author has contributed to research in topics: Projectile & Railgun. The author has an hindex of 8, co-authored 24 publications receiving 207 citations. Previous affiliations of Johan Gallant include Atomic Energy of Canada Limited.
Topics: Projectile, Railgun, Muzzle, Muzzle velocity, Missile

Papers
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Journal ArticleDOI
TL;DR: In this paper, three different geometries of parallel augmented railguns have been simulated with the finite-element electromagnetic code MEGA and the mutual inductance gradient and the stress on the rails have been calculated as a function of the geometry and compared with M' and the rail stress in a simple railgun.
Abstract: Three different geometries of parallel augmented railguns (circular with one pair of augmenting rails, rectangular with two pairs of augmenting rails, and rectangular with one pair of augmenting rails) have been simulated with the finite-element electromagnetic code MEGA. The mutual inductance gradient M' and the stress on the rails have been calculated as a function of the geometry and compared with M' and the rail stress in a simple railgun. Therefore, constant currents were injected in a three-dimensional railgun model with a fixed projectile. The simulations show that the rectangular geometry with one pair of augmenting rails is the best choice for an experimental railgun: M' is the highest of the three geometries studied and the mechanical structure is the simplest. By investigating the stress on the rails when injecting a pulsed current, we found that a delay between the current injection in the inner circuit and that in the outer circuit can reduce the drag force on the projectile due to the eddy currents induced by the outer circuit current. We show that the outer rails can be attracted or repulsed, depending on the ratio between the current in the inner circuit and that in the outer circuit.

46 citations

Journal ArticleDOI
TL;DR: In this article, a model for the electromagnetic force in a parallel augmented railgun and a friction model for a brush projectile are presented, and the kinematics of the projectile in the gun are simulated with these models and are compared to the measured velocity.
Abstract: One of the main issues of railguns is the ablation of the rails due to the existence of a plasma arc occurring at high currents. To avoid the heat load on the rails, it is necessary to reduce the current intensities. The use of a parallel augmented railgun is one method of lowering the current without reducing the electromagnetic force on the projectile. One- and two-brush projectiles have been fired in a parallel augmented railgun with a 15 mm /spl times/ 15 mm caliber and with a barrel length of 1.5 m. These experiments have shown that the maximum kinetic energy at the muzzle-without the transition of the solid contact between the rails and the brush to a plasma contact-can be significantly increased in an augmented railgun. The maximum kinetic energy has increased by a factor of 5 for one-brush projectiles and by a factor of 9 for two-brush projectiles. A model for the electromagnetic force in the augmented railgun and a friction model for the brush projectile are presented. The kinematics of the projectile in the gun are simulated with these models and are compared to the measured velocity. A good agreement is obtained.

43 citations

Proceedings ArticleDOI
18 May 2015
TL;DR: The aim of this review paper is to collect and summarize the actual smart clothing in the space and military field where conditions could be critical for health and safety, and outline the innovation trend for innovative services to police and soldiers.
Abstract: Wearable technologies are now pervading many applications in several fields. The aim of this review paper is to collect and summarize the actual smart clothing in the space and military field where conditions could be critical for health and safety, and outline the innovation trend for innovative services to police and soldiers.

32 citations

Journal ArticleDOI
TL;DR: The method of elastic recoil detection, using 1.5-2.2 MeV energy 4 He beams, has been used for the first time to detect tritium as discussed by the authors.
Abstract: The method of elastic recoil detection, using 1.5–2.2 MeV energy 4 He beams, has been used for the first time to detect tritium. Test samples were fabricated by thermal sorption of tritium into thin (5 μg cm −2 ) Ti films and by implantation of low energy (10 keV) HT + ions into amorphized silicon and oxide targets. Distributions of surface and subsurface tritium has been profiled to a depth of a few tenths of a micron, with a depth resolution of 10 to 20 nm and a sensitivity better than 10 15 atoms cm −1 .

18 citations

Book ChapterDOI
21 Jul 2018
TL;DR: All the steps involved in the workflow for the design of a proposed solution of a smart garment for monitoring soldier’s performance can prevent a decrease in wearer's performance ensuring a more successful design.
Abstract: Smart clothes development history started in the military field and this still remains a main application field. A soldier is like a high-performance athlete, where monitoring of physical and physiological capabilities of primary importance. Wearable systems and smart clothes can answer this need appropriately. Smart cloth represents a “second skin” that has a close, “intimate” relation with the human body. The relation is physiological, psychological, biomechanical and ergonomical. Effectiveness of functional wear is based on the integration of all these considerations into the design of a smart clothing system. The design of smart cloth is crucial to obtain the best results. Identifying all the steps involved in the co-design workflow can prevent a decrease in wearer’s performance ensuring a more successful design. This paper presents all the steps involved in the workflow for the design of a proposed solution of a smart garment for monitoring soldier’s performance.

17 citations


Cited by
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Journal ArticleDOI
TL;DR: The communication security issues facing the popular wearables is examined followed by a survey of solutions studied in the literature, and the techniques for improving the power efficiency of wearables are explained.
Abstract: As smartphone penetration saturates, we are witnessing a new trend in personal mobile devices—wearable mobile devices or simply wearables as it is often called. Wearables come in many different forms and flavors targeting different accessories and clothing that people wear. Although small in size, they are often expected to continuously sense, collect, and upload various physiological data to improve quality of life. These requirements put significant demand on improving communication security and reducing power consumption of the system, fueling new research in these areas. In this paper, we first provide a comprehensive survey and classification of commercially available wearables and research prototypes. We then examine the communication security issues facing the popular wearables followed by a survey of solutions studied in the literature. We also categorize and explain the techniques for improving the power efficiency of wearables. Next, we survey the research literature in wearable computing. We conclude with future directions in wearable market and research.

486 citations

Journal ArticleDOI
TL;DR: The past and present of smart garments are reviewed in order to provide guidelines for the future developers of a network where garments will be connected like other IoT objects: the Internet-of-Smart-Clothing.
Abstract: Technology has become ubiquitous, it is all around us and is becoming part of us. Togetherwith the rise of the Internet of Things (IoT) paradigm and enabling technologies (e.g., Augmented Reality (AR), Cyber-Physical Systems, Artificial Intelligence (AI), blockchain or edge computing), smart wearables and IoT-based garments can potentially have a lot of influence by harmonizing functionality and the delight created by fashion. Thus, smart clothes look for a balance among fashion, engineering, interaction, user experience, cybersecurity, design and science to reinvent technologies that can anticipate needs and desires. Nowadays, the rapid convergence of textile and electronics is enabling the seamless and massive integration of sensors into textiles and the development of conductive yarn. The potential of smart fabrics, which can communicate with smartphones to process biometric information such as heart rate, temperature, breathing, stress, movement, acceleration, or even hormone levels, promises a new era for retail. This article reviews the main requirements for developing smart IoT-enabled garments and shows smart clothing potential impact on business models in the medium-term. Specifically, a global IoT architecture is proposed, the main types and components of smart IoT wearables and garments are presented, their main requirements are analyzed and some of the most recent smart clothing applications are studied. In this way, this article reviews the past and present of smart garments in order to provide guidelines for the future developers of a network where garments will be connected like other IoT objects: the Internet of Smart Clothing.

189 citations

Journal ArticleDOI
TL;DR: In this article, a review of ballistic textiles and composites involved in the ballistic application including body armour is presented, and various technical approaches used for better understanding of the very complex process of the ballistic impact mechanisms and their responses to the materials are discussed.

180 citations

Journal ArticleDOI
TL;DR: In this article, a time of flight energy recoil telescope system for mass and energy dispersive recoil spectrometry has been applied to study the formation of Mg2Si layers and depth profiling of Ga1−xAlxAs quantum well structures.
Abstract: A time of flight-energy recoil telescope system for mass and energy dispersive recoil spectrometry has been applied to study the formation of Mg2Si layers and depth profiling of Ga1−xAlxAs quantum well structures. Measurements of the energy (depth) dependence of the mass resolution showed that the telescope could be used over the energy range from 5 to 18 MeV to distinguish between recoils of 1 amu mass difference up to mass 28 amu. The energy dependence of the detection efficiency was found to be independent of the recoil energy for 12C and 28Si recoils and no strong evidence for a recoil species dependence of the detection efficiency for recoils heavier than 16O was found.

166 citations

Journal ArticleDOI
TL;DR: In this paper, a review of elastic recoil detection (ERD) is presented, which determines the yield and energy of particles ejected out of the surface region of samples under MeV ion bombardment.
Abstract: In elastic recoil detection (ERD) one determines the yield and energy of particles ejected out of the surface region of samples under MeV ion bombardment. By application of this surface and thin film analysis technique one can obtain quantitative information concerning the depth distribution of light elements in a sample to be analysed. The quantitativity and the depth resolving power are based on knowledge of the recoil cross section and the stopping power of high-energy ions in matter. This paper reviews the fundamentals of this technique and the various experimental methods for recoil identification. Furthermore, important features for material analysis, such as detection limits, depth resolution and elemental range are discussed. Some emphasis is put on the conversion of the spectral contribution of the elements to atomic concentrations in the films for several representative cases. Throughout the review numerous examples are given to illustrate the features of ERD and to demonstrate empirically the accuracy of the quantification method.

137 citations