Abstract Polymer melt‐direct intercalation or exfoliation is a promising approach for the preparation of nanocomposites. The structure nanoclay platelets in nanocomposites depends not only on properties polymer matrix and nanoclay, but also operating conditions during processing. objective present work to investigate effects clay chemical modifiers, mixing protocols, upon prepared with corotating twin‐screw extruder. Two methods were used nanocomposite preparation: two‐step one‐step mixing....

Abstract A numerical simulation model that incorporates three phases, polymer matrix, interlayer, and clay platelet, was developed to predict the tensile modulus of nanoclay‐filled composites. The interlayer introduced account for fact mechanical properties near surface are different from those matrix. effects interlayers, structure clusters, platelet distributions upon elasticity nanocomposites, were studied. results show a decrease in modulus, as well an increase thickness, would...

Multi-threaded programs are pervasive, yet difficult to write. Missing proper synchronization leads correctness bugs and over performance problems. To improve the efficiency of multi-threaded software, we need a better understanding challenges faced by real-world developers. This paper studies code repositories open-source software projects obtain broad in- depth view how developers handle synchronizations. We first examine critical sections changed when evolves checking 250,000 revisions...

Abstract This experimental study examines the evolution of extent dissolution active pharmaceutical ingredient (API) indomethacin (INM) into polymer excipient Eudragit E PO (E PO) on four screw configurations processed in an APV 15 mm corotating twin extruder. The screws were pulled out and quenched by water, which allowed for quick access to stream carcass. Polarized light microscopy (PLM), scanning electron (SEM), Fourier transform infrared spectroscopy (FT‐IR), employed investigate INM's...

Abstract Reactive extrusion is a complex process, and numerical simulation an important method in optimizing operational parameters. In the current work, two different methods, one‐dimensional (1D) model three‐dimensional (3D) model, were introduced to predict polymerization of ε‐caprolactone fully filled screw elements. The predicted results progression under conditions based on these methods compared. show that simplifications assumptions 1D make it difficult capture mixing mechanism, heat...

Abstract By correlating the curvature of carbon nanotubes to orientation fibers in a polymer, effect on tensile modulus carbon‐nanotube‐reinforced polymer composites was investigated with numerical simulation method. The results showed that nanotube‐reinforced composite drops sharply when diverge from their axial direction, and presence curved matrix significantly decreases composite. This finding could explain, partly, why most cases, predicted composite, based assumption are fully isolated...

Abstract An ultraviolet (UV) photo‐polymerization particle coating process was developed by coupling the photo‐initiated cationic polymerization with fluidized bed techniques. Unlike conventional air‐suspension in bed, new employs a UV curable composition instead of solvent/water‐borne system as material, which has rapid curing rate and virtually no inhibition to oxygen moisture. A modified coater equipped quartz window allows light penetrate initiate photo‐sensitive polymerizable chemicals...

Abstract With the visualization corotating twin‐screw extruder, melting of HDPE pellets under different screw configurations and operational conditions was investigated on‐line. It is shown that progression polymer in extruders from single‐screw extruders. Screw configuration, speed, feed rate are three decisive factors melting. Based on phenomena, a new mechanism, island‐sea model , defined. found an important mechanism to realize high efficiency progression. The state polymer, degree fill,...

Abstract A fluid energy–based method and apparatus was used to simultaneously mill coat coarse particles with the presence of various coating materials, including: three micron‐sized particles—carnauba wax, polyethylene (PE), polytetrafluoroethylene (PTFE) particles, one type nanoparticle, PTFE. The performance polymeric materials their effect on breakage were studied. Young's modulus materials' size ratio found be critical in controlling quality. coating, working as a lubricant cushion...

Fault tolerance and energy have become important design issues in multiprocessor system-on-chips (SoCs) with the technology scaling proliferation of battery-powered SoCs. This paper proposed an energy-efficient fault task allocation scheme for SoCs real-time harvesting systems. The fault-tolerance is based on principle primiary/backup scheduling, can tolerate at most one single transient fault. Extensive simulated experiment shows that save up to 30% consumption reduce miss ratio about 8%...

Abstract Particle‐dispersed melting is a complex but important mechanism in the corotating twin‐screw extruder. In this study, multi‐particle‐dispersed system was simplified into single‐particle model. The finite‐difference method introduced to solve problem. simulation results show that of particle may involve two steps: heating stage and stage. time depend on solid concentration, initial melt temperature, shear rate. Calculations indicate high concentration low temperature rate will result...

Plastic energy dissipation (PED) is an important mechanism involving the melting of polymer in a twin-screw extruder. In present study, behavior pellets under compression studied by simplified model with finite element method, based on fact that mechanical from deformation single pellet converted into heat energy. The shows heating not uniform. Under compression, contact area yields first, and depends ratio properties pellet. simulated results show temperature volume around line passing...

A protocol-friendly enhanced automatic repeat request (ARQ) scheme is proposed in this letter to improve the probability of successful retransmission by combining lost medium access control protocol data units (MPDUs) and their duplicates into an aggregate MPDU (A-MPDU) when number MPDUs small. To study performance scheme, we provide a mathematical model that analyzes saturation throughput selects optimized parameters obtain best performance. The simulation results show analytical accurate...

Abstract The UV curing of ultrathin films acrylates on Al 2 O 3 particles has been studied by using photodifferential scanning calorimetry (photo‐DSC). Effects the chemical structure monomers, thickness films, type initiators, and presence oxygen were investigated. Results show that photopolymerization particle surface is much more sensitive to poisoning than thick flat surfaces, conversion monomers depends types initiators selected. When alpha hydroxyl ketones (Esacure KIP100F) used as...