With the development of intelligent transportation systems, vehicular ad hoc networks (VANETs) are widely used in safety driving, and so on. However, existing signature schemes, such as pseudonym- group-based have certain problems, need for a certificate distribution revocation lists (CRLs). vehicle needs to store valid generated by management center. Simultaneously, receiver check CRLs prior message authentication. require large amounts storage space computational communication resources....

Recently, the pollution and damage caused by antibiotics in water have aroused serious concerns. In this situation, it is extremely important to develop a highly effective approach detect water. contribution, we built Cd-MOF material with stable fluorescence properties, using bbi = 1,4-bis(2-methyl-imidazol-1-yl)butane H2L 1,2-phenylenediacetic acid as organic ligands Cd(NO3)2·4H2O metal node. The selective response of MOF probe ceftriaxone sodium (an antibiotic) can reach up ppb level...

The experimental study on thermocapillary convection in liquid bridges of large Prandtl number has been carried out Tiangong-2 space. purpose these experiments is to the oscillation instability convection, and discover recognize mechanism destabilization microgravity environment In this paper, geometry a half-floating-zone bridge featured by aspect ratio Ar volume Vr , its influence critical conditions oscillatory studied. More than 700 sets space have finished. characteristics – parameter...

Thermocapillary convection has always been one of the most important research topics in microgravity fluid physics. A space experimental study on thermocapillary an open annular liquid pool – a typical flow system conducted SJ-10 satellite China. This experiment observed spatial temperature distribution free surface using infrared thermal imager, obtained pattern transition process, analysed oscillation characteristics and revealed instability mechanism themocapillary convection. The shape...

We carried out space experiments on thermocapillary convection in liquid bridges with large Prandtl number the Tiangong-2 laboratory, studying influence of geometrical parameters, including aspect ratio (Ar, height to diameter) and volume (Vr). It is found that there are two modes temperature oscillation bridges: low- high-frequency oscillation, corresponding different critical difference respectively. In this paper, effect wave pattern its transformation oscillating flow studied detail....

A fluid experiment was conducted on China’s SJ10 satellite to assess the instability of thermocapillary convection under microgravity. Oscillations in an annular pool were investigated when difference temperature exceeded a certain threshold. Dynamics and transitions wave pattern observed using infrared camera. This work is concerned with effect surface configuration patterns. There are 3 types configurations that depend volume ratio: Vr < 0.77 (zone 1), 1 2), > 3). An...

We studied the evolution of flow structures and large-scale circulations (LSC) in Rayleigh–Bénard convection (RBC) using liquid carbon dioxide as working medium. In this experiment, a transparent sapphire pressure vessel with observable internal was designed, different temperature differences were applied between upper lower surfaces fluid to obtain Rayleigh numbers (Ra). employed proper orthogonal decomposition reconstruction extract from shadowgraphy images. used optical techniques acquire...

In this paper, the coupling effect of multiphysical fields droplet migration is deeply studied by constructing a physical model with fields. Digital holographic interferometry and particle image velocimetry are used to simultaneously measure temperature velocity mother liquor in process for first time. Due advancements measuring, zero-velocity region also where thermal wake appears, four vortexes appear off-axis behavior double-droplet found. The aim work analyze relationship fields, so as...

Marangoni-Bénard convection, which is mainly driven by the thermocapillary (Marangoni) effect, occurs in a thin liquid layer heated uniformly from bottom. The wavenumber of supercritical convection studied experimentally 160×160 cavity that bottom block. pattern visualized an infrared thermography camera. It shown onset Bénard cell consistent with theoretical analysis. decreases obviously increasing temperature, except for slight increase near onset. gradually approaches minimum when number...

The pattern formation and spatial–temporal chaos are interesting issues in nonlinear dynamics. A novel model based on machine learning methods is designed to learn imitate the evolution Bénard–Marangoni convection (BM convection). There a supercritical process, which an inevitable unique experimental phenomenon, way BM convection. single layer of fluid uniformly heated at bottom used as system. During experiment, temperature difference between top liquid increased first make system enter...

Bénard-Marangoni convection can be used to self-organize hexagonal convective cells, but defects easily emerge in the pattern, which hinders its application industry. The dynamics of front propagation and defect generation are studied this paper. We focus especially on onset process a local disturbance named “nucleus.” nucleus has been researched through numerical simulations model equation experiments. In simulations, single evolve into perfect hexagon pattern under critical or subcritical...

Apodemus is the most common small rodent species in Palearctic realm and an ideal for biogeographical research understanding environmental changes. Elucidating phylogenetic relationships will help us better understand adaptation genetic evolution. Due to its stable structure, maternal inheritance, rapid evolution, mitogenome has become a hot spot taxonomic evolutionary studies. In this research, we determined mitochondrial genome of agrarius ningpoensis draco studied phylogeny Muridae using...

In recent years, significant progress has been made in single-image super-resolution (SISR) with the emergence of convolutional neural networks (CNNs). However, application SISR on low computing power devices is hindered by massive number parameters and computational costs. Despite focus lightweight models many studies, majority still struggles to balance performance model size, making it difficult apply them real-life situations. Therefore, we propose construct an network termed 3D image...

Spray cooling is an effective solution for high heat flux dissipation challenges. Accurate prediction of transfer efficiency by numerical simulation can reduce the cost spray in engineering applications. To improve accuracy simulation, this study develops a mathematical model droplet collision and response based on experimental data. In experiments, droplets are sprayed onto 200 °C aluminum alloy thermal wall using atomizing nozzle, temperature monitored, curve variation during estimated...

Cross-zero expansion coefficient Rayleigh–Bénard–Marangoni (CRBM) convection refers to the convective phenomenon where thermal with stratified positive and negative coefficients in a liquid layer is coupled Marangoni convection. In Bénard convection, fluids cross-zero contain neutral (α) zero, local buoyancy-driven leading unique flow instability phenomena. This paper uses linear stability theory analyze CRBM horizontal under vertical temperature gradient performs numerical calculations for...

This paper provides a detailed description of the development and experimental results supercritical flow experiment payload carried on TZ-6 cargo spacecraft, as well systematic verification out-of-cabin deployment experiment. The technical engineering indicators are analyzed, functional modules shown. design, installation location, size, weight, temperature, illumination, pressure, radiation, control, command reception, telemetry data, downlink procedures for in extreme conditions space....

The annular flow payload is among the first batch of space science experimental projects carried out on Fluid Physics Rack China Space Station. This paper provides a detailed introduction to development payload, ground validation, and in orbit experiments. sized 320 mm × 200 220 mm, includes an model supports supply (24 V, 12 5 V), communication, data transmission. A multi-functional heating column was designed, allowing for operate fixed, rotating, lifting scenarios. In round, 96 sets...

Utilizing deep features from electroencephalography (EEG) data for emotional music composition provides a novel approach creating personalized and emotionally rich music. Compared to textual data, converting continuous EEG into discrete units presents significant challenges, particularly the lack of clear fixed vocabulary standardizing audio data. The this standard makes mapping relationship between signals musical elements (such as rhythm, melody, emotion) blurry complex. Therefore, we...

Thermocapillary convection is a common flow in space. Experiments regarding thermocapillary were previously carried out large-scale liquid bridge with diameter of 20 mm on the Tiangong-2 space station, and transition process to chaos was systematically studied. Under microgravity conditions, gravity greatly weakened, very slow. This allows for opportunity study bifurcation detail. It has been found that there are abundant nonlinear physical phenomena associated changing geometric parameters...

Abstract The development of space experiment payload for studying thermocapillary convection in the liquid bridge with large Pr number on TG-2 laboratory as well experiments are presented detail this paper, and objectives confirmed. functions analyzed, technical engineering specifications determined. Detailed designs experimental verifications performed structure columns, method bubble removing liquid, cleaning system, accurate control aspect ratio volume ratio, high-sensitivity measurement...