Experiments on surface-active polymer flooding for enhanced oil recovery were carried out by detection analysis and modern physical simulation technique based reservoirs fluids in Daqing placanticline oilfield. The experimental results show that the is different from other common polymers polymer-surfactant systems molecular aggregation, viscosity flow capacity, it has larger coil size, higher viscosifying poorer mobility. solution good performance of viscosity-increasing retention,...

Efficient insulation technology is one of the key technologies for development large LH2 storage tanks. This paper aimed at a 4000 m3 spherical tank, many schemes were designed, including multilayer systems integrated with vapor-cooled shield (VCS) and liquid-nitrogen-cooled (LN2CS). The heat transfer model was developed to predict performance tank. effect VCS position on studied, different configurations double VCSs compared discussed. results showed that daily evaporation rate MLI, hollow...

With the innovation of digital technologies, personalized fabrication occlusal splints has shifted from traditional manual methods to an efficient and precise workflow. This paper systematically reviews latest advancements in materials, design clinical applications splints, analyzes core issues current practice such as insufficient standardization lack long-term efficacy evidence, proposes a dynamic diagnosis-and-treatment protocol based on four-dimensional virtual dental patient technology....

Root canal filling is a necessary skill for dental students and an important aspect of endodontic education. This study aimed to evaluate the effect students' clinical experiences on isthmus using different techniques sealers. One hundred eight three-dimensional-printed resin replicas were divided into six groups either continuous wave condensation (CWC) or single-cone obturation (SC) was performed. three sealers (AH Plus Jet®, GuttaFlow2, iRoot SP) used together with size-fitted...

Abstract Owing to load variations, the power tracking of fuel cells in automotive applications is emphasized. We address control strategies meet varying demands while optimizing system efficiency. Based on control‐oriented proton exchange membrane cell model, relative gain array analyzed determine variable parings design. As dynamics two variables are different, a cascade architecture adopted. A feedforward‐feedback composite used achieve fast response and eliminate stable error. To avoid...

The corrosion behavior of keyhole-free friction stir spot welded joints dissimilar 6082 aluminum alloy and DP600 galvanized steel in 3.5% NaCl solution has been investigated by the immersion test electrochemical analysis. surface produced exfoliation pitting corrosion. occurred seriously on interface alloy, but had no galvanic couples were formed between elements Si Fe with a high electrode potential, Mg Al low around them. Mg2Si Si-containing solid-solution phase α (Al) preferentially...

Differently colored quantum dot (QD) nanoparticles are incorporated into bovine serum albumin (BSA) nanospheres by spray-drying followed thermal denaturization, which is a rapid, highly efficient, large scale, and low cost method. Because the spray-dryer equipped with an ultrasonic atomizer, most of no more than 550 nm in diameter have narrow size distribution. Ultrathin sections (70 nm) first prepared using technique normally applied to cell sectioning. The section images show that QD–BSA...

This work systematically investigates the interface behavior and impact properties of keyhole-free friction stir spot welding (FSSW) a dissimilar metal AA6082-T4 Al alloy DP600 galvanized steel. The keyhole is eliminated by pin retraction technology. process in accordance with temperature curve maximum periphery shoulder, measured at about 500 °C. transition layers were formed interface, which Al, Fe, Zn elements form an inhomogeneous diffusion. A cloud cluster-like mechanical mixing steel...

A small amount of commercial functional nanosilica was mechanically mixed with epoxy to enhance the composite fracture toughness. Nanosilicas amino and epoxide groups show strong interfaces epoxy, which suppress large aggregations resin-wettability, hence enhancing toughness composites. Compared other reports, less content needed achieve same values or similar enhancement ratio. Due their availability, low-cost raw material simple fabrication method, those nanocomposites have potential for...

Al/Mg/Al composite plates were fabricated by hot pressed sintering (HPS) and rolling. The main purpose of this study is to understand the effect rolling on microstructure, interface mechanical properties HPS plates. Rolling can increase compactness microstructure improving distribution internal voids promote diffusion interfacial elements, forming a transition layer consisting phases [Formula: see text]-Al 3 Mg 2 text]-Al[Formula: text]Mg[Formula: text], which improves strength, plasticity,...

The energy evolution, fatigue life and failure behaviour of dissimilar Al/steel keyhole-free Friction stir spot welding (FSSW) joints were studied under different loads. absorption fracture, the fracture mechanism sensitivity limits to load parameters analysed. It was found that stress ratio R determines limit Ff, while Ff is not sensitive loading frequency. high-frequency will increase displacement deformation μ Ea spot-welded joint, which are larger asymmetric than those symmetrical...

The AA7075/AZ31/AA7075 laminated composites were fabricated by hot roll bonding. effects of pretreatment Mg plate severe plastic deformation (SPD) and heat treatment on its interface, microstructure mechanical properties studied. diffusion layer is formed at the interface between Al layers, which composed hard brittle intermetallic phases [Formula: see text] text], become weak zone where crack first-generated propagated to cause delamination composites. hardness reaches 300–400 HV....

Early cement paste (0h-6h) made with of different Blain specific surface area was investigated 23MHz 1H low-field NMR. T2 distribution, against age and distributions were obtain. Results showed: 1) distribution fresh common has two peaks corresponded to water within flocculation among flocculation; 2)T2 could reflect a stage-like behaviour hydration; 3) showed evolution microstructure in early paste.

Compared with traditional prosthodontic methods, digital technology greatly simplifies the treatment process of patients and improves accuracy prosthesis. The fully workflow is becoming an important direction development fixed prosthodontics. It can not only effectively improve efficiency, predictability prosthodontics, but also help cooperation between multiple disciplines to ensure systematic treatment. This article systematically discusses concept process, key technology, material...