Synthetic aperture radar (SAR) image classification is a hot topic in the interpretation of SAR images. However, absence effective feature representation and presence speckle noise images make difficult to handle. In order overcome these problems, deep convolutional autoencoder (DCAE) proposed extract features conduct automatically. The network composed eight layers: layer texture features, scale transformation aggregate neighbor information, four layers based on sparse autoencoders optimize...

Poly(methyl methacrylate) (PMMA) has been modified via a dc pulsed oxygen plasma for different treatment times. The surfaces were characterized by X-ray photoelectron spectroscopy (XPS), optical profilometer, zeta potential, and advancing contact angle measurements. measured angles of water decreased considerably as function discharge. Several oxygen-based functionalities (carbonyl, carboxyl, carbonate, etc.) detected XPS, while potential measurements confirmed an increase in negative charge...

Abstract Phosphogypsum (PG) as one of the largest amounts industrial solid wastes, is simply pretreated by conventional lime neutralization method to apply for preparation PG/PLA‐GND/PLA/PBAT composite through melt blending in this work, where PLA grafted with glycidyl decanoate (PLA‐GND) used a non‐reactive compatibilizer. The hydroxyl groups PG particles could form internal hydrogen bonds ester groups, terminal and carboxyl or PBAT chains, which would promote uniform dispersion generation...

Two-dimensional gaseous detonations near critical propagation state were studied numerically in a channel with stoichiometric H $_2$ /air and /O mixtures. Detonation waves exhibit mode-locking effect (MLE) single-headed mode regime. Increasing the width alters strength period of single transverse wave. This leads to MLE failure occurrence single-dual-headed mode, featuring emergence new For mixture, generation wave is due interactions between detonation front local explosion originating from...

We propose a discrete Boltzmann model for microfluidics based on the equation with external forces using single relaxation time collision model. Considering electrostatic interactions in systems, we introduce an equilibrium distribution function that differs from Maxwell-Boltzmann by exponential factor to represent action of force field. A statistical mechanical approach is applied derive equivalent acceleration exerting lattice particles mean-field approximation, resulting potential energy...

This paper begins with a discussion on the significance of multi-physical fields in research railgun launching mechanism, followed by an introduction work about dynamic measurements and numerical simulations. The application some measurement methods including atomic emission spectrum, fiber-optic strain, optical level, pulsed X-ray, high-speed video observing process was introduced. models electromechanical processes were developed. mechanisms grooving, arc transition, gouging analyzed....

The contact resistance between the armature and rails is an important indicator of characteristics in electromagnetic launches. As depends not only on state but also stress temperature, there are some limitations analyzing using resistance. In this paper, augmented railgun analyzed by combination sliding friction coefficient. Firstly, theoretical calculation model coefficient established. Then calculated measured values muzzle voltage, rail current displacement. Finally, according to...

Abstract Poly(lactic acid) (PLA) grafted glycidyl neodecanoate (GND) with a single epoxy group (PLA‐GND) is prepared in this paper by solid phase grafting, and the effects of different reaction conditions on grafting percentage PLA‐GND are investigated. Furthermore, used as nonreactive compatibilizer to prepare PLA‐GND/PLA/poly(butylene adipate‐co‐terephthalate) (PBAT) composite melt blending. The results show that has highest 2.15% when feed weight ratio GND PLA 0.2, triphenylphosphine...

In this article, the explicit finite difference method is used to solve magnetic–thermal coupling phenomenon of velocity skin effect (VSE), and at different velocities analyzed. order reduce VSE between armature rail, phenomena layered rail with graphite coating, Ti Mo Al metal, combined structure were studied, respectively. The results show that increase velocity, gradually appears in can weaken adverse VSE. Although VSE, physical properties metal will cause local temperature tail be too...

In order to achieve a normal performance of the armature, which is moving part carrying currents in railgun, it great importance maintain good electrical contacts between armature and rails. this paper, based on mutiphysics effects, dynamic interior ballistic process considering friction loss, nonlinear contacts, aerodynamic drag established simulate movement bore. Some parameters versus time, such as forces wear rate interference, were obtained analyzed. Incorporating with morphology rail...

A gouging phenomenon with a hypervelocity sliding electrical contact in railgun not only shortens the rail lifetime but also affects interior ballistic performance. In this paper, 3-D numerical model was introduced to simulate and analyze generation mechanism evolution of phenomenon. The results show that surface bulge is an important factor induce gouging. High density high pressure material flow on surface, obliquely extruded into when accelerating armature velocity, can produce Both...

Projectile size effect is of great importance since the scaling researches are extensively applied to concrete penetration investigations. This paper numerically deals with projectile on resistance via recently developed Lattice Discrete Particles Model (LDPM) which featured mesoscale constitutive laws governing interaction between adjacent particles account for cohesive fracture, strain hardening in compression and compaction due pore collapse. Simulations two different tests carried shed...

Cultivating microalgae in post hydrothermal liquefaction wastewater (PHWW) offers many benefits, including nutrients recovery and reuse, purification biomass production. However, the high concentration toxic substances PHWW undermine efficiency of production nutrient recovery. This study aimed to investigate effects strains, initial concentrations inoculum sizes on using as cultivation medium. Results indicated that both were successfully improved by screened strain at desirable with...