P(AN/VAc)/Clay was preparated by in-situ polymerization in this paper.The superficial appearance,particulate dimension,compose,crystallizing structure and hot behavior of the composite were proved through TEM,X-ray,IR,NMR,DSC,TG.The results indicate that the particulate dimension of the nano-composite is 50 nm~80 nm,which belongs to nanometer,and the composite has multi-layer structure.The results also show that intensity,stability of dimension and heat-resistant property of P(AN/VAc)/Clay are all superior to that of P(AN/VAc),which is significative for polyacrylonitrile fiber or acrylic fiber.
With unlimited topological modes in mathematics, the fractional orbital angular momentum (FOAM) demonstrates the potential to infinitely increase the channel capacity in acoustic-vortex (AV) communications. However, the accuracy and stability of FOAM recognition are still limited by the nonorthogonality and poor anti-interference of fractional AV beams. The popular machine learning, widely used in optics based on large datasets of images, does not work in acoustics because of the huge engineering of the 2-dimensional point-by-point measurement. Here, we report a strategy of phase-dislocation-mediated high-dimensional fractional AV communication based on pair-FOAM multiplexing, circular sparse sampling, and machine learning. The unique phase dislocation corresponding to the topological charge provides important physical guidance to recognize FOAMs and reduce sampling points from theory to practice. A straightforward convolutional neural network considering turbulence and misalignment is further constructed to achieve the stable and accurate communication without involving experimental data. We experimentally present that the 32-point dual-ring sampling can realize the 10-bit information transmission in a limited topological charge scope from ±0.6 to ±2.4 with the FOAM resolution of 0.2, which greatly reduce the divergence in AV communications. The infinitely expanded channel capacity is further verified by the improved FOAM resolution of 0.025. Compared with other milestone works, our strategy reaches 3-fold OAM utilization, 4-fold information level, and 5-fold OAM resolution. Because of the extra advantages of high dimension, high speed, and low divergence, this technology may shed light on the next-generation AV communication.
A novel light conversion agent (NLCA) has been synthesized that is applicable to polyethylene (PE) film. The composition and structure of the NLCA was characterized by elemental analysis, Fourier transform infrared (FT‐IR) spectroscopy, and nuclear magnetic resonance (NMR) spectrometry. The morphology, particulate dimensions, dispersion property and compatibility of the NLCA were characterized by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The results indicate that the average particulate dimension was about 60–100 nm and they were dispersed well in the PE film. The luminescence property of the NLCA was studied via fluorescent spectrometry. The fluorescence spectra of the NLCA show that the NLCA has a highly efficient luminescence. Keywords: light conversion agentEu (III)compatibilityluminescence
A polyethylene terephthalate nano porous luminescence fiber (PNPLF) was prepared through electrospun technology. The SEM and TEM images show that the surfaces of the fibers are covered with pores. The diameter of the fiber is 250–500 nm, and the diameter of the pores is 20–180 nm. The water and oil contact angles of PNPLF are 135° and 27°, respectively. The oil absorption value of the as-prepared PNPLF achieves 135 g/g and has a good oil absorption function. The as-prepared PNPLF has good luminescence properties and fluorescent-indicating function. Even trace amounts of oil can also cause obvious change of fluorescence intensity of PNPLF which has a good stability from 20 °C to 70 °C. The breaking stress of yarn of PNPLF reaches 117cN. Furthermore, the good mechanical properties and thermal properties of PNPLF provide important basic conditions for their wide applications.
nanomicron fiber of Tb (phen)L 3 /poly (methyl methacrylate) (PMMA) was successfully prepared by electrospinning using ethyl acetate (EA) and N,N-dimethyl-formamide (DMF) as the solvent. The influence of collector distance, feed rate, applied voltage and the proportion of EA/DMF on the morphology of the as-prepared fibers were discussed. Based on the researched results, the nanomicron fibers with glazed surface and uniform distribution were prepared. The fluorescent spectra indicate that the nanomicron fibers have good fluorescent properties.
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