Bond integrity is of interest to researchers in non-destructive evaluation because it is used as an indicator when assessing the health of structures. In this study, a plate waveguide on a half space is examined to fi...
Bond integrity is of interest to researchers in non-destructive evaluation because it is used as an indicator when assessing the health of structures. In this study, a plate waveguide on a half space is examined to find features associated with bond integrity. Analytical and finite element models are developed to describe wave propagation. Mode and frequency selection optimization is discussed. Preliminary results suggest that changes in arrival time and amplitude can be used to detect the length of a very weak bond when using a special mode of strong in-plane displacement at the interface.
A range of radiation vulcanised natural rubber latex (RVNRL) films were prepared using various concentrations of aqueous extracts of mature Diospyros peregrina fruit, which acted as a cross-linking agent. The surface ...
A range of radiation vulcanised natural rubber latex (RVNRL) films were prepared using various concentrations of aqueous extracts of mature Diospyros peregrina fruit, which acted as a cross-linking agent. The surface of the RVNRL films exhibited an aggregated morphology of the rubber hydrocarbon with increasing roughness due to increasing fruit extract contents in the latex. An improvement in tensile strength, tensile modulus, and storage modulus of RVNRL films was observed with the addition of fruit extracts compared to the control film due to their cross-linking effect. The glass transition ( T g ) temperature of all the RVNRL films was found to be at around −61.5°C. The films were also observed to be thermally stable up to 325°C, while the maximum decomposition temperature appeared at around 375°C. The incorporation of fruit extracts further revealed a significant influence on increasing the crystallinity, gel content, and physical cross-link density of the RVNRL films.
Swarms of self-propelled particles exhibit complex behavior that can arise from simple models, with large changes in swarm behavior resulting from small changes in model parameters. We investigate the steady-state swa...
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Swarms of self-propelled particles exhibit complex behavior that can arise from simple models, with large changes in swarm behavior resulting from small changes in model parameters. We investigate the steady-state swarms formed by self-propelled Morse particles in three dimensions using molecular dynamics simulations optimized for graphics processing units. We find a variety of swarms of different overall shape assemble spontaneously and that for certain Morse potential parameters at most two competing structures are observed. We report a rich “phase diagram” of athermal swarm structures observed across a broad range of interaction parameters. Unlike the structures formed in equilibrium self-assembly, we find that the probability of forming a self-propelled swarm can be biased by the choice of initial conditions. We investigate how thermal noise influences swarm formation and demonstrate ways it can be exploited to reconfigure one swarm into another. Our findings validate and extend previous observations of self-propelled Morse swarms and highlight open questions for predictive theories of nonequilibrium self-assembly.
We demonstrated an efficient continuous wave and tunable laser actions of a new thulium-doped oxyorthosilicate Tm:LuYSiO5 crystal. A maximum slope efficiency of 50.2% and a discontinuous tunable operation ranging from...
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In this paper, a multi-functional of multi-layer planar micro-coils chip is demonstrated to play as actuators and heaters. For playing as actuators, the micro-coil generate local magnetic field with applied current of...
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In this paper, a multi-functional of multi-layer planar micro-coils chip is demonstrated to play as actuators and heaters. For playing as actuators, the micro-coil generate local magnetic field with applied current of 15 mA to quickly manipulated magnetic beads to center of micro-coil within one minute. For functioning as heaters, the micro-coil heater can be quickly heated up to denatured temperature of 95 °C with input power of 50.5 mW, and its heating and cooling rate are 19.7 and 11.8 °C/s, respectively. For the typical 25 polymerase chain reaction (PCR) cycles, it took only 770 seconds. To further shrink and optimize the multi-layer planar micro-coils chip can be possibly used to manipulate single cell with magnetic beads to specific region and analyze its gene sequence by using single cell PCR technique.
In this paper, we explore the effects of misfit strain fields on both heterogeneous nucleation behavior and anisotropic growth of islands at submonolayer coverages and compositional patterning at complete monolayer co...
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In this paper, we explore the effects of misfit strain fields on both heterogeneous nucleation behavior and anisotropic growth of islands at submonolayer coverages and compositional patterning at complete monolayer coverage via simulations of a phase-field crystal model. In particular, deposition on top of a herringbone structure and quasicrystalline (QC) substrate are considered, the former representing a system with spatially periodic misfit strain fields arising from the presence of surface dislocations, and the latter representing a system which inherently possesses a wide range of local, aperiodic misfit patterns. In the case of single-component systems, we demonstrate that misfit strain fields lead to heterogeneous nucleation behavior and anisotropic island growth. In the case of QC substrate, a wide range of morphologies, such as coexistence of locally hexagonally ordered atomic clusters within a larger scale arrangement with overall QC symmetry and so-called “starfish” aggregates, is observed in a pure system at submonolayer coverages when the adlayer-substrate interaction strength and lattice mismatch are tuned. In the case of bulk-immiscible binary systems at complete monolayer coverage, strain-stabilized compositional domains emerge at low line tension values for both substrates. Interestingly, the compositional domains on the QC substrate inherit their symmetries at sufficiently low line tension values, while at larger line tension values, the domain structure begins to resemble the classical spinodal microstructure. Such domain structures should be readily observable in colloidal systems in which attractive interparticle and particle-substrate interactions can be tuned.
A new prototype of Uric Acid (UA) biosensor is constructed by combining high electron mobility transistors (HEMTs) with Zinc Oxide Nanotetrapods (T-ZnOs). T-ZnOs are synthesized by chemical vapor deposition (CVD). The...
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A new prototype of Uric Acid (UA) biosensor is constructed by combining high electron mobility transistors (HEMTs) with Zinc Oxide Nanotetrapods (T-ZnOs). T-ZnOs are synthesized by chemical vapor deposition (CVD). These T-ZnOs with high specific areas are evenly distributed on the gate areas of HEMTs to improve the sensitivity of the HEMTs. Uricase is then immobilized on the T-ZnOs by their different isoelectric points (IEP). When different UA solutions are added to the gate areas of HEMTs, the biosensors respond in around one second through signal current change. The fabricated biosensors can detect target UA in solutions of concentrations ranging from 0.2 nM to 0.2 mM with a detection limit of 0.2 nM.
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