Military University of Technology in Warsaw

Observation of a supersolid phase in a spin-orbit coupled exciton-polariton Bose-Einstein condensate

In Bose-Einstein condensates, spin-orbit coupling (SOC) produces supersolidity. It is a peculiar state of matter, which, in addition to the superfluid behavior, shows periodic density modulation typical for crystals. Here, we report the fabrication of an original type of optical...

Evaluating ensemble ranking fusion for multi-source localization in propagation graphs

Source identification in propagation graphs is an inverse problem that aims to recover the initial infected or activated nodes from an observed propagation snapshot. This paper studies a static, structure-driven setting in which temporal traces, observer timestamps, and large lab...

Strain rate effect on frictional behaviour of Hardox 450 steel

Abstract The influence of strain rate on the frictional behaviour of high-strength Hardox 450 steel have been investigated using both experimental and numerical approaches. The ring compression test method was employed to identify the friction coefficient across a wide range of s...

The Impact of Test Conditions and Lay-Up Configuration on SEA in Carbon–Epoxy Tubes

This article presents the effect of test velocity and the percentage of unidirectional (UD) and woven (WF) fibers on specific energy absorption (SEA). Composite tubes with an internal diameter of 20 mm were fabricated using five prepreg layers. Progressive crushing of the specime...

Studies on the impact of a soft elastic infill on the mechanical properties and synergy effect of double-arrowhead honeycomb composites

An experimental study was conducted on a composite double-arrowhead auxetic honeycomb structure filled with five types of soft elastic matrices. The study also presents the results of tests performed on empty double-arrowhead honeycomb structures as well as on the soft elastic ma...

Validation of a Lightweight Unmanned Ground Vehicle Model for Undercarriage and Drive System Dynamic Loads Analysis

The modeling of lightweight unmanned ground vehicles (UGVs) with elastomeric tracks presents a challenge due to nonlinear contact mechanics and compliance characteristics that differ significantly from heavy steel-tracked platforms. This study validates a high-fidelity multibody...

Two-Pass Friction Stir Welding of AZ31/AA1050 Bimetallic Butt–Lap Joint

Abstract This study evaluated the feasibility of friction stir welding (FSW) of AZ31/AA1050 bimetallic plates produced by explosive welding. The investigated material had a total thickness of 10 mm (5 + 5 mm) and, after milling, 8 mm (4 + 4 mm). Butt–Lap joints were produced usin...

Integrating Powder Metallurgy with Explosive Cladding: A Novel Route for Bimetallic Copper–Steel Tube Fabrication

Copper–steel bimetals are widely used in industry. Due to the significantly different physical properties of these two materials, explosive cladding is the most effective method for joining them. This article presents a novel method for manufacturing bimetallic copper–steel tubes...

A Five-State Markov Reliability Model for GEO Satellites with Sequential Degradation, Sudden Critical Transitions, and Functional Restoration

Long-term GEO satellite operation requires reliability models that distinguish full mission capability from degraded but still functional states and from critical functional loss. This study develops a five-state Markov reliability model in which states S0–S4 represent successive...

Ternary Liquid-Crystalline Mixture Showing Broad Antiferroelectric Smectic CA* and Glassy Hexatic Smectic XA* Phases

Abstract A ternary liquid crystalline mixture was designed to obtain a tilted hexatic smectic phase in the glassy state. Structural, electro-optic, and dielectric properties of the mixture are investigated, and selected measurements are also performed for its pure components. In...

Guest-host approach to reduce driving voltages in electro optic liquid crystal devices

We describe a simple guest-host approach allowing the reduction of driving voltages in liquid crystal (LC) electro optic devices via the increase of the effective dielectric anisotropy. This is achieved by doping the nematic LC host by molecules possessing high dipole moments. Po...

Surface self-doping capabilities in anodic Nb2O5 prepared by plasma electrolytic oxidation

Self-doping is an effective strategy for introducing defects in metal oxides such as Nb2O5, thereby modifying their electrochemical properties. The formation of defects, such as oxygen vacancies, has been associated with decreased surface charge-transfer resistance and increased...

Uncertainty in AI-Based Terrain Traversability Prediction from Incomplete Geospatial Data

Abstract. Terrain traversability mapping is a geospatial problem with direct relevance to off-road mobility assessment, route planning, crisis response, and spatial decision support. Although machine learning has become an increasingly attractive complement to rule-based GIS proc...

Silver‐Modulated Copper Dynamics Under Pulsed Tandem Electrochemical CO 2 Reduction

ABSTRACT Pulsed electrolysis and Cu‐Ag tandem catalysis are both promising strategies for electrochemical CO 2 reduction, yet their interplay remains unclear. Here, we show that pulsed operation does not preserve the as‐prepared Cu‐Ag catalyst and instead generates a dynamic bime...

Under the Sea: Detection of Explosives Underwater Using Raman Spectroscopy

Secondary explosives such as 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX) and 2,4,6-trinitrotoluene (TNT) were commonly used in the production of many types of munitions during World War II and still continue to be used, for example, 1,3,5,7-tetranitro-1,3,5,7-tetrazocane (HMX) a...

Electrostatic Reconfiguration of Photo‐Patterned Periodic Structures With Half‐Integer Twist Disclination Lines in Ferroelectric Nematic Liquid Crystals

ABSTRACT The recently discovered ferroelectric nematic liquid crystals, combining fluidity with spontaneous polarization, offer unique opportunities for engineering polar domain structures for (nonlinear) photonic applications. A central challenge lies in achieving precise contro...

Fracture Energy and Crack Resistance of Hybrid Fiber-Reinforced High-Strength Concrete: Experimental Study and Analytical Modeling

Abstract This study examines the fracture and mechanical performance of hybrid fiber-reinforced high-strength concrete (HFRHSC) with different water-to-binder (W/B) ratios. Six mixtures incorporating hybrid combinations of steel, polymer, glass, and basalt fibers were investigate...

Lateral Cyano Substitution as a Tool for Tuning Negative Dielectric Anisotropy in High‐Birefringence Liquid Crystals

A series of 10 novel liquid crystalline compounds based on oligophenyl and tolane cores bearing laterally positioned cyano groups has been designed, synthesized, and systematically investigated. The molecular architecture was tailored by varying the number and position of lateral...

A look at nanowire photodetectors

Nanowire (NW) photodetectors have emerged as a prominent group of optoelectronic materials that have been extensively researched over the last two decades. They belong to the one-dimensional nanostructures and operate in the regime of wave optics because the diameter of the NW is...