Abstract This study established a dynamic analysis model for laminated annular plates coupled with periodically distributed vibration absorbers (DVAs). Based on the first-order shear deformation theory (FSDT), kinetic energy, strain external work, and boundary spring potential energy of structure were derived using method penalty function approach, Lagrangian functional was constructed. According to simplification principle, DVAs simplified into basic elements consisting mass blocks...

Microrib is a very promising heat transfer enhancement method for the design of scramjet regenerative cooling channels. In this paper, three-dimensional numerical model has been built and validated to parametrically investigate thermal behavior transcritical n-Decane in mini channels with microribs under near critical pressure. The results have shown that height pitch microrib perform nonmonotonic effect on convective coefficient inside channel optimal parameters stay at low values due...

Efforts to enhance the speed and reduce energy consumption of underwater vehicles have led proposal a novel mucus release structure inspired by secretion cells on fish skin. This features interconnected microgrooves with excellent flexibility for adjusting different states, effectively reducing drag through release. Numerical analysis reduction performance mucous-releasing micro-pore was conducted using ANSYS Fluent 19.2 software. is capable velocity gradient near wall and, owing presence...

With the increasing penetration of distribution generations (DGs), stability problems power system become more and serious. Virtual synchronous generator (VSG) as an effective solution, can improve converter inertia, but there is still possibility oscillation due to small line impendence ratio R/X. In this paper, a signal dynamic model derived for second-order VSG model. It analyzed pointed out that exists coupling problem resonance point on VSG, 180° phase lag introduced at point, which...

Visualizing the near-field distribution of microwave field in a monopole antenna is very important for design and manufacture. However, traditional method measuring near by mechanical scanning has some problems, such as long measurement time, low accuracy large system volume, which seriously limits effect distribution. In this paper, imaging using nitrogen-vacancy center diamond presented. We use whole probe camera to achieve wide-field imaging. Because there no displacement structure...

Underwater vehicles typically rely on batteries or other energy sources for operation, where drag reduction can significantly lower consumption and extend operational endurance. Inspired by the skin structure of loaches, a flexible with scales mucus pores was designed. First, numerical simulations were conducted. To accurately demonstrate interaction between flow field fluid to capture movement boundaries plates, bidirectional fluid–structure simulation method used. The results indicate that...

Abstract An environmental procedure to extract titanium components and metallic iron from Ti-bearing blast furnace slag is accomplished via three steps, which are high-temperature modification, gravity separation hydrometallurgy method. The behaviors of during the modification process studied. feasibility separating rutile matrix phase investigated; based on analysis results, experiment carried out in order improve TiO

An actinobacterial strain, designated R-N-C8 T , was isolated from the rhizosphere soil of Arabidopsis thaliana collected in Yunnan Province, south-west China. Based on results 16S rRNA gene sequence analysis, strain had highest similarity to Nocardioides terrae CGMCC 1.7056 (96.5%), opuntiae KCTC 19804 (96.3%) and currus IB-3 (96.1%), lower than 96.0 % other members genus . Phylogenetic trees based sequences indicated that formed an branch with N. The polar lipids contained...

This paper proposes a new type of flexible force-sensitive structure that is resistant to gamma radiation and made tungsten oxide (WO3) powder, polydimethylsiloxane (PDMS), carbon nanotube (CNT) sponge. The thickness the sample was 2.2 mm, middle interlayer composed sponge PDMS form conductive layer, upper lower layers were PDMS, which formed gamma-ray shielding layer. When particle size powder 50 nm, 100 1 µm, composite exhibited better performance. irradiated with doses 5, 20, 50, KGy...

In order to develop green energy, reduce carbon emissions, and alleviate global warming the energy crisis, many researchers focus on wave using a device convert into electricity. The three main types of converters are overtopping type, oscillating water column body for most them, power generation efficiency is low. research team in this paper proposed converter wave-induced oscillation heave plate. plate vibrates up down under action waves, captured vibrating transfers generator, so as...

Musical intangible cultural heritage refers to the transmission of expressions with connotations and social significance through music as a carrier. It covers rich variety musical forms traditional instruments, embodies creation inheritance by human beings in different historical periods regional environments. Through music, it can promote pass on national culture local culture, strengthen people's sense identity belonging. Music has ability cross languages cultures, inheritance, exchanges...

Nanoparticle surfactant (NPS) is a highly competitive means for stabilizing liquid–liquid interfaces, endowing interfacial assemblies with functionalities, and enabling the construction of all-liquid devices. Integrating different types supramolecular interactions into NPSs would open possibilities to generate interfaces that are responsive multiple stimuli. Here, by using donor–acceptor between polydopamine nanoparticles (PDA NPs) methyl viologen (MV2+) terminated polystyrene, formation,...

The morphological, mechanical and rheological properties of poly(trimethylene terephthalate)(PTT)/maleinized acrylonitrile-butadiene-styrene (ABS-g-MAH)/short carbon fiber (SCF) composites were investigated by the scanning electron microscopy(SEM), universal tester, impact tester capillary rheometer, respectively. SEM images composites’ fracture surface show that is rough SCF are randomly dispersed in matrix resin, there a good interfacial interaction between PTT. maximum tensile strength...

Abstract The single-moored light buoys employed in the lower reaches of Yangtze River play an important role indicating ship navigation and ensuring safety. To clarify interaction between waves floating moored to riverbed, this paper applies a numerical approach investigate wave-induced motion performance buoy reveal effects different mooring configurations extend its service life. An open-source smoothed particle hydrodynamics (SPH)-based model named dualsphysics coupled with MoorDyn is...

This paper presents an analysis method of RCS frequency response characteristics based on dielectric loss, and explains the cause difference between theoretical formula measured data Loneberg lens reflector. Based design principle thickness shell constant Luneberg reflector, expression electric path electromagnetic wave propagating inside reflector is derived. At same time, loss mechanism, improved, rationality verified through in microwave anechoic chamber. The results show that...