In this paper,a graphene oxide(GO)composite film-coated humidity sensor is proposed based on the hollow core fiber(HCF).A segment of the HCF is spliced between two segments of the single-mode fiber(SMF).The relative h...
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In this paper,a graphene oxide(GO)composite film-coated humidity sensor is proposed based on the hollow core fiber(HCF).A segment of the HCF is spliced between two segments of the single-mode fiber(SMF).The relative humidity(RH)sensing characteristics of the sensor are experimentally investigated by observing the intensity shift of resonant dips in the transmission spectrum,which shows the GO composite film-coated HCF has the good stability in the measurement of *** maximum humidity sensitivity of 0.12 dB/%RH is obtained in the RH range of 30%–78%.The proposed sensor has the advantages of the simple structure,easy fabrication,good stability,and high performance,which can be applied to marine climate detection,tunnel air humidity detection,agricultural testing,and other fields.
A 4 MeV RF linear accelerator for electron beam irradiation applications has been developed at the PBP-CMU Electron Linac Laboratory,*** system has been reengineered using a decommissioned medical linear *** main comp...
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A 4 MeV RF linear accelerator for electron beam irradiation applications has been developed at the PBP-CMU Electron Linac Laboratory,*** system has been reengineered using a decommissioned medical linear *** main components include a thermionic DC electron gun,an RF linear accelerator,a beam diagnostic chamber,and a beam exit window for electron beam ***,reengineering must be performed based on the characteristics of the electron beam and its dynamics throughout the *** this study,the electron beam current density emitted from the cathode was calculated based on the thermionic emission theory,and the result was used to produce the electron beam distribution in the gun using CST Studio Suite^(■)*** properties of the electron beam and its acceleration in the linear accelerator and downstream diagnostic section were studied using the ASTRA electron beam dynamics simulation code,with the aim of producing an electron beam with an average energy of 4 MeV at the linear accelerator *** transverse beam profile and electron deposition dose in the ambient environment were calculated using Geant4 Monte Carlo simulation software to estimate the beam performance for the irradiation *** parameters studied can be used as guidelines for machine operation and future experimental plans.
Despite the enormous progress made in microbiome research,a comprehensive and universally accepted framework for identifying healthy microbiome biomarkers remains *** what constitutes a"healthy"gut microbiom...
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Despite the enormous progress made in microbiome research,a comprehensive and universally accepted framework for identifying healthy microbiome biomarkers remains *** what constitutes a"healthy"gut microbiome is not an easy task due to its complexity and dynamic ***,the quest to define a healthy microbiome has centered on identifying biomarkers like microbial diversity and the Firmicutes-to-Bacteroidetes(F/B)ratio.
We propose a major upgrade to the existing PandaX-4T experiment at the China Jinping Underground *** new experiment,PandaX-xT,will be a multi-ten-tonne liquid xenon,ultra-low background,and general-purpose *** full-sc...
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We propose a major upgrade to the existing PandaX-4T experiment at the China Jinping Underground *** new experiment,PandaX-xT,will be a multi-ten-tonne liquid xenon,ultra-low background,and general-purpose *** full-scaled PandaX-xT contains a 43-t liquid xenon active *** an experiment will significantly advance our fundamental understanding of particle physics and *** sensitivity of dark matter direct detection will be improved by nearly two orders of magnitude compared to the current best limits,approaching the so-called“neutrino floor”for a dark matter mass above 10 GeV/c^(2),providing a key test to the Weakly Interacting Massive Particle *** searching for the neutrinoless double beta decay of^(136)Xe isotope in the detector,the effective Majorana neutrino mass can be measured to a 10-41 meV/c^(2) sensitivity,providing a key test to the Dirac/Majorana nature of *** neutrinos and other ultra-rare interactions can also be measured and searched for with an unprecedented background level,opening up new windows of *** on the findings,PandaX-xT will seek the next stage upgrade utilizing isotopic separation of natural xenon.
Motion blur widely exists in uncooled infrared images. Because of the obvious cross-shaped bright lines and a large amount of noise interference in the uncooled infrared image spectrum, it is difficult to estimate the...
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GaAs-based light-emitting diodes (LEDs) are commonly employed in a variety of applications, including medical imaging, biosensing, optical communications, and night vision. In this paper, we present an alternative app...
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Traditional mid-infrared optical devices are characterized by complex structures, large volumes, and high prices, which impede the advancement of future multidimensional, multifunctional, and miniaturized integration....
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Nd^3＋： Gd3Ga5O12（Nd ： GGG） nanopowder for transparent laser ceramics was synthesized using sol-gel method. XRD, SEM, and fluorescence spectrum were used to study the properties of Nd^3＋ ：Gd3Ga5O12 nanopowder. X...
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Nd^3＋： Gd3Ga5O12（Nd ： GGG） nanopowder for transparent laser ceramics was synthesized using sol-gel method. XRD, SEM, and fluorescence spectrum were used to study the properties of Nd^3＋ ：Gd3Ga5O12 nanopowder. XRD patterns of samples show that it has a cubic structure. Meanwhile, pure Nd：GGG crystals were obtained at 1000 ℃ for 12 h. SEM photographs show that dispersed, uniform, ball-like Nd：GGG nanopowder is obtained. Both XRD and SEM results show that the crystallization degree and the grain size increase with the increase in calcining temperature. Analysis of fluorescence spectrum shows that fluorescence emission occurs at 1062.7 nm, which is the result of Nd^3＋ （^4F3/2→^4I11/2） transition. Homogenous Nd ： GGG nanopewder with a small grain size synthesized using the sol-gel method is favorable for sintering the transparent ceramic, which proves that the nanopewder obtained is suitable as a precursor for preparing GGG transparent ceramics.
When an aircraft equipped with infrared guidance systems flies at high Mach numbers through the atmosphere, the infrared window interacts strongly with the incoming flow, resulting in aerodynamic thermal radiation eff...
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A novel method for designing chalcogenide long-period fiber grating(LPFG) sensors based on the dual-peak resonance effect of the LPFG near the phase matching turning point(PMTP) is presented. Refractive index sensing ...
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A novel method for designing chalcogenide long-period fiber grating(LPFG) sensors based on the dual-peak resonance effect of the LPFG near the phase matching turning point(PMTP) is presented. Refractive index sensing in a high-refractive-index chalcogenide fiber is achieved with a coated thinly clad film. The dual-peak resonant characteristics near the PMTP and the refractive index sensing properties of the LPFG are analyzed first by the phase-matching condition of the LPFG. The effects of film parameters and cladding radius on the sensitivity of refractive index sensing are further discussed. The sensor is optimized by selecting the appropriate film parameters and cladding radius. Simulation results show that the ambient refractive index sensitivity of a dual-peak coated thinly clad chalcogenide LPFG at the PMTP can be 2400 nm/RIU, which is significantly higher than that of non-optimized gratings. It has great application potential in the field of chemical sensing and biosensors.
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