- 标题
- 摘要
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- 实验方案
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The Influence of Ceramic Far-Infrared Ray (cFIR) Irradiation on Water Hydrogen Bonding and its Related Chemo-physical Properties
摘要： The property of water is highly related to the earth's environment and climate change. The fundamental dynamical process of water is include formation and breaking of hydrogen bonds. This dynamic process, so far, is still poorly understood. We investigated weakening of the hydrogen bonds of water after ceramic Far-Infrared Ray (cFIR) irradiation and the resulting effects on physical and chemical properties of water. In this study, the Fourier transform infrared spectroscopy (FT-IR) was used to explore hydrogen bonding change of cFIR-irradiated water; in addition, capillary viscometers, Gas Chromatographs (GC), Differential Scanning Calorimetry (DSC), contact angles, Franz cells, High-Performance Liquid Chromatography (HPLC), and capillary electrophoresis analysis were used to evaluate its physical characteristics, such as viscosity, volatility, temperatures of water crystallization, surface tension, diffusion, hydrogen peroxide dissociation, solubility of solid particles, and changes in pH of acetic acid. The cFIR treated water decreased in viscosity and surface tension (contact angles), but increased in the solubility of solid particles, hydrogen peroxide dissociation, temperatures of water crystallization, and acidity of acetic acid. The weakening of water hydrogen bonds caused by cFIR irradiation is correspondent with our previous medical-biological studies on cFIR.
关键词： Hydrogen bonds,Fourier transform infrared spectroscopy (FT-IR),Contact angle,Ceramic far infrared ray (cFIR),Irradiation water,Solubility,Volatility
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE 6th Workshop on Advances in Information, Electronic and Electrical Engineering (AIEEE) - Vilnius, Lithuania (2018.11.8-2018.11.10)] 2018 IEEE 6th Workshop on Advances in Information, Electronic and Electrical Engineering (AIEEE) - Automated Image Annotation based on YOLOv3
摘要： A typical pedestrian protection system requires sophisticated hardware and robust detection algorithms. To solve these problems the existing systems use hybrid sensors where mono and stereo vision merged with active sensors. One of the most assuring pedestrian detection sensors is far infrared range camera. The classical pedestrian detection approach based on Histogram of oriented gradients is not robust enough to be applied in devices which consumers can trust. An application of deep neural network-based approach is able to perform with significantly higher accuracy. However, the deep learning approach requires a high number of labeled data examples. The investigation presented in this paper aimed the acceleration of pedestrian labeling in far-infrared image sequences. In order to accelerate pedestrian labeling in far-infrared camera videos, we have integrated the YOLOv3 object detector into labeling software. The verification of the pre-labeled results was around eleven times faster than manual labeling of every single frame.
关键词： deep-learning,YOLOv3,Far-infrared,pedestrian detection,annotation labeling
更新于2025-09-23 15:23:52
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Protective potentials of far-infrared ray against neuropsychotoxic conditions
摘要： Compelling evidence suggests that far-infrared ray (FIR) possesses beneficial effects on emotional disorders. However, the underlying mechanism conveyed by FIR remains unclear. Recently, we demonstrated that exposure to FIR induces antioxidant potentials via up-regulation of glutathione peroxidase (GPx)-1 gene. The antioxidant potentials might be important for the modulation on the neuropsychotoxic conditions. Exposure to FIR protects from methamphetamine (MA)-induced memory impairments via phosphorylation of ERK 1/2 signaling by positive modulation of protein kinase C δ (PKCδ), M1 muscarinic acetylcholine receptor (M1 mAChR), and nuclear factor E2-related factor 2 (Nrf2) transcription factor. In addition, exposure to FIR positively modulates MA-induced behavioral sensitization via attenuating mitochondrial dysfunction by down-regulation of dopamine D1 receptor. In this mini-review, we have discussed with the protective potentials mediated by FIR against MA-induced psychotoxic burdens.
关键词： Methamphetamine,Far-infrared ray,Behavioral sensitization,Glutathione peroxidase-1 gene,Memory impairments
更新于2025-09-23 15:21:21
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The synergistic effects study between metal oxides and graphene on far-infrared emission performance
摘要： Materials with high far-infrared (FIR) emissivity are quiet promising in modern medical care field, owing to its accelerating effects to blood circulation and metabolism. In this work, we synthesized two serials composites: MnO2/graphene nanoplate (GNPs) and Fe2O3/GNPs via in situ hydrothermal process. Positive synergistic effects on FIR emission were shown between either MnO2 or Fe2O3 and GNPs. In particular, MnO2/GNPs (2%) showed a super high FIR emissivity of 0.981 compared with pristine MnO2 (0.940) and GNPs (0.878) in the wavelength of 8–14 μm. The FIR emissivity of Fe2O3/GNPs (1%) was up to 0.953 that was much higher than those of pristine Fe2O3 (0.877) and GNPs as well. Benefiting from the characteristics of graphene such as large specific surface, lightweight and thin-layer, MnO2 and Fe2O3 nanocrystals grew on graphene surface and formed different morphologies. A coralloid-like morphology was formed to MnO2/GNPs (2%), suggesting a highly porous surface that meant more unstable atoms or molecules were exposed. The morphologies of metal oxide/GNPs were thought to relate with the good synergistic effects between GNPs and metal oxides. Therefore, this work provides that metal oxides/graphene composites have promising application for high FIR emission materials.
关键词： MnO2,Graphene,Far-infrared emission,Fe2O3
更新于2025-09-23 15:21:01
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A Graphenea??Based Flexible Device as a Specific Fara??Infrared Emitter for Noninvasive Tumor Therapy
摘要： Noninvasive treatments are emerging as a promising strategy not only due to their non-invasive nature, but also due to their additive effects to traditional radiotherapy and chemotherapy. Herein, specific far-infrared rays generated from single-layer, graphene-based devices are applied to tumors as a novel noninvasive therapeutic strategy. In MDA-MB-231 breast cancer cell xenograft and metastasis models, irradiation generated from this flexible device reduces the rate of tumor growth and the number of metastatic nodules per lung by 42% and 55%, respectively. This result might be induced by the similarity between the emission spectra of the device and the absorption spectra of the living tissue. With its high energy conversion and safety, the graphene-based device can serve as an adjuvant therapeutic instrument for combined tumor treatment.
关键词： far-infrared ray,graphene,noninvasive tumor therapy,resonant absorption
更新于2025-09-19 17:13:59
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All-Fiber Bidirectional Mode-Locked Ultrafast Fiber Laser at 2? <i>μ</i> m
摘要： In this paper, we demonstrated an all-?ber bidirectional ultrafast thulium-doped ?ber laser at 2 μm with a single-wall carbon nanotube presented as saturable absorber. We successfully obtained bidirectional mode-locking operations with pulse repetition frequency adjustable from 35 to 122 MHz by shortening the cavity length. Meanwhile, with the reduction of the intracavity dispersion, the number of Kelly sidebands was signi?cantly decreased and the output energy was more concentrated on the soliton pulse. Besides, by manipulating the pump power and polarization controller, the two results of bidirectional mode-locked pulses with the same repetition frequency and differential repetition frequency were observed. We found that the repetition rate difference between the clockwise and counterclockwise pulse trains was adjustable by changing the pump power or controlling the intracavity polarization. When the pulse repetition frequency was 35 MHz and 122 MHz, the adjustment range of repetition rate difference was 764–922 Hz and 540–2000 Hz, respectively. It is believed that this novel laser source can support free-running dual optical comb spectroscopy to detect important air gases like H2O or CO2 in the future.
关键词： infrared and far-infrared lasers,thulium-doped ?ber,?ber optics and oscillators,Ultrafast lasers
更新于2025-09-16 10:30:52
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Tunable infrared asymmetric light transmission and absorption via graphene-hBN metamaterials
摘要： We theoretically prove in this paper that using planar multilayer graphene-hexagonal boron nitride (hBN) metamaterials (GhMMs) can yield ultrabroadband and high-contrast asymmetric transmission (AT) and asymmetric absorption (AA) of light. The AA and AT features are obtained in the far-infrared (FIR) and mid-infrared (MIR) regions for normally incident light with transverse magnetic polarization. Here, the GhMMs are integrated with two asymmetric gratings of Ge and are composed of alternating multilayers of graphene (11 multi-layers) and hBN layers (10 layers). Moreover, the total subwavelength thickness of the hybrid structures is about 3 μm, being less than half of the free-space wavelength up to nearly 50 THz. This approach—which is similar to the one introduced by Xu and Lezec [Nat. Commun. 5, 4141 (2014)] for a passive hyperbolic metamaterial operating in the visible range—is based on the excitation of high-β modes of the GhMM with di?erent transmission characteristics. In addition to being ultrabroadband and high-contrast, AT and AA features of the proposed GhMMs can be actively tuned by varying the chemical potential of graphene. Furthermore, it is shown that an on-o? switching of AT factor at FIR and selective tunability at MIR frequencies can be obtained via varying μ. Due to its subwavelength and planar con?guration and active operation, these multilayer graphene-hBN metamaterials with AT and AA characteristics hold promise for integration with compact optical systems operating in the MIR and FIR ranges and are suitable for applications such as optical diodes, sensors, and thermal emitters.
关键词： asymmetric absorption,asymmetric transmission,mid-infrared,graphene-hBN metamaterials,tunable optical properties,far-infrared
更新于2025-09-16 10:30:52
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Probing Polaritons in 2D Materials with Synchrotron Infrared Nanospectroscopy
摘要： Polaritons, which are quasiparticles composed of a photon coupled to an electric or magnetic dipole, are a major focus in nanophotonic research of van der Waals (vdW) crystals and their derived 2D materials. For the variety of existing vdW materials, polaritons can be active in a broad range of the electromagnetic spectrum (meVs to eVs) and exhibit momenta much higher than the corresponding free-space radiation. Hence, the use of high momentum broadband sources or probes is imperative to excite those quasiparticles and measure the frequency-momentum dispersion relations, which provide insights into polariton dynamics. Synchrotron infrared nanospectroscopy (SINS) is a technique that combines the nanoscale spatial resolution of scattering-type scanning near-field optical microscopy with ultrabroadband synchrotron infrared radiation, making it highly suitable to probe and characterize a variety of vdW polaritons. Here, the advances enabled by SINS on the study of key photonic attributes of far- and mid-infrared plasmon- and phonon-polaritons in vdW and 2D crystals are reviewed. In that context the SINS technique is comprehensively described and it is demonstrated how fundamental polaritonic properties are retrieved for a range of atomically thin systems including hBN, MoS2, graphene and 2D heterostructures.
关键词： s-SNOM,hexagonal boron nitride,far-infrared SINS,2D materials,polaritons,infrared synchrotron nanospectroscopy,graphene
更新于2025-09-12 10:27:22
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Numerical study of a high negative refractive index based tunable metamaterial structure by graphene split ring resonator for far infrared frequency
摘要： We present a numerical study of a high negative effective refractive index based actively tunable squared shaped graphene split ring resonator for far infrared frequency spectrum. Graphene split ring resonator (GSRR) structure is investigated for the different cases of the split rings. Tunability of the structure is controlled by varying the different chemical potential of the graphene sheet, which can be controlled by external potential. Transmission, Reflection and Absorption parameters are investigated to check the resonance response. At each and every point of resonance, highly negative refractive index is been observed. The proposed structure is producing the multiple short as well as large band resonance band over 1 THz to 2.5 THz frequency range for the different chemical potential that varies between 0.1 eV to 0.9 eV. The study results inferred that tunable properties of the GSRR structure can help to design the various photonics device such as sensor, modulator and polarizer, etc.
关键词： Far infrared frequency,Negative refractive index,Graphene split ring resonator,Metamaterial,Tunable
更新于2025-09-12 10:27:22
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Quasi-all-fiber structure CW mid-infrared laser emission from gas-filled hollow-core silica fibers
摘要： A quasi-all-?ber structure CW mid-infrared ?ber lasers based on gas-?lled hollow-core ?bers (HCFs) is ?rstly reported here. Through a thermally tapered single-mode ?ber, the CW tunable 1.5 μm ?ber pump light is coupled into an acetylene-?lled anti-resonance HCFs, and the coupling point is sealed with epoxy glue to ensure the stability and gas tightness, then the HCFs is ?lled with acetylene gas by a specially designed small gas cell, just like an end cap. When the pump is precisely tuned to the resonance with the absorption lines of acetylene, CW mid-infrared emission around 3.1–3.2 μm is generated at room temperature with maximum power of ~180 mW and slope e?ciency of ~14%. The laser threshold is also discussed as function of acetylene pressure. This work opens new opportunities for all-?ber mid-infrared lasers of new wavelengths those unavailable for traditional rare-earth-doped ?bers.
关键词： Molecular gas lasers,Infrared and far-infrared lasers,Fiber lasers,Photonic crystal ?bers
更新于2025-09-11 14:15:04