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Microwave diagnostics of pulsed atmospheric discharge with electrolytic electrode and long-lived luminous formation in its afterglow

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High Voltage 2024年第1期9卷 127-136页

作者： Shixin Zhao Xingbao Lyu Aleksandr Astafiev Chengxun Yuan Lin Miao Jingfeng Yao Ying Wang Anatoly Kudryavtsev Aleksandr Chirtsov Gennadii Shabanov Zhongxiang Zhou School of Physics Harbin Institute of TechnologyHarbinChina Physics Department Saint Petersburg Electrotechnical University“LETI”St.PetersburgRussia Heilongjiang Provincial Key Laboratory of Plasma Physics and Application Technology HarbinChina Physics Department St.Petersburg State UniversitySt.PetersburgRussia Konstantinov Petersburg Nuclear Physics Institute National Research Centre“Kurchatov Institute”GatchinaRussia

The Gatchina discharge phenomenon holds significant promise as a laboratory model for simulating ball lightning.However,crucial aspects concerning the plasma components of the resulting afterglow remain unresolved.Notably,the measurement of the electron density,a critical parameter,has not been fully achieved thus far.In this study,microwave diagnostics and video recording were employed during a pulsed Gatchina discharge,along with synchronous measurement of discharge current and voltage.Distinct antennas were positioned at different heights to enable separate diagnosis of the discharge and the ensuing long-lived afterglow.The findings revealed that during the active phase of the Gatchina discharge,the plasma density was substantial enough to cause reflection of an electromagnetic wave with a frequency of 20 GHz from this highly conductive object.In the afterglow,the signal experienced only a moderate weakening of 10–20 percent,facilitating the determination of the time dependence of average electron density during the afterglow's passage between the two antennas.These measurements verified the unusually slow plasma decay in the afterglow of the Gatchina discharge,suggesting the potential significance of chemi-ionisation processes involving long-lived(metastable)particles.

关键词： holds luminous electrolytic

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Investigation of thermal behavior of energetic and non-energetic binders on luminous efficiency of high performance miniature flares

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Defence Technology（防务技术） 2019年第2期15卷 193-197页

作者： Saeid Bagherpour Mohammad Mahdavi Ebrahim Abedini Department of Chemistry Malek-ashtar University of Technology

Miniature flares containing magnesium/sodium nitrate compounded with different binders were studied for increasing luminosity and luminous efficiency in various fuel oxidizer ratio and flare diameters.Unsaturated polyester, Bisphenol-A epoxy resin, calcium resinate, and nitrocellulose were used as binders for construction the flares. Experimental results showed that luminous efficiency was higher for polyester based flares. Due to the difference in decomposition progress of various binders and the exothermic reaction between binder and oxidizer the luminous efficiency of the mixtures were 31000,28900, 27800 and 25100 cd respectively for polyester, epoxy, calcium resinate, and nitrocellulose. It was found that nitrocellulose as an energetic binder produces the highest light intensity in comparison to other binders, but the burning rate is higher and the burning time is lower than the other binders.Thermal analysis of four binders showed that the heat of reactions was directly related to the amount of light output and luminosity.

关键词： Miniature flare Illuminating compositions luminous efficiency Binder

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New red phosphors enable white LEDs to show both high luminous efficacy and color rendering index

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Science Bulletin 2019年第13期64卷 879-880页

作者： Xiaoyong Huang Institute for Advanced Study Shenzhen University College of Physics and Optoelectronics Taiyuan University of Technology

Today, energy saving and emission reduction are two big global issues. Power artificial lighting currently accounts for about 20% of the total global electricity consumption [1]. Solid-state lighting based on light-emitting diodes (LEDs) is bringing about a revolution in energy-efficient lighting, and the lighting industry is transformed into a rapidly growing business sector [2,3]. The solid-state lighting technology is basically based on phosphor- converted white LEDs (pc-LEDs), which are commonly fabricated by using the combination of InGaN blue-emitting LED chips and luminescent materials as color converters [4,5], Luminescent materials play a critical role in fabricating high-performance LED devices, which is strongly linked to LED's luminous efficacy, stability, color rendering index (CRI), correlated color temperature (CCT) and operation lifetime [6-8]. Therefore, the discovery of more efficient desirable phosphor materials is essential.

关键词： luminous efficacy rendering index red phosphors

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Influence of artificial luminous environment and TCM intervention on development of myopia rabbits

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Asian Pacific Journal of Tropical Medicine 2015年第3期8卷 243-248页

作者： Yan Liu Yu-Liang Wang Ke-Lei Wang Fang Liu Xia Zong Department of Ophthalmology Nanjing University of Chinese Medicine Department of Ophthalmology.Jiangsu Province Hospital of TCM Affiliated Hospital of Nanjing University of TCM Department of Ophthalmology Wuxi Hospital of TCM Department of Ophthalmology Shanghai TCM-Integrated HospitalShanghai University of TCM No.1 Clinical Medical College Nanjing Unirersity of Chinese Medicine

Objective:To explore the influence of artificial luminous environment and preventive function of traditional Chinese medicine(TCM) intervention based on "Theory of yin-yang clock" on myopia.Methods:A total of 45 New Zealand young rabbits were randomly divided into 5groups,9 for each group.Control group was exposed in natural light.Fluorescent group and full spectrum group were exposed in fluorescent light and full spectrum light,on which basis fluorescent TCM group and full spectrum TCM group were added with "Rizhong Yinyang Formulas",respectively.Optical parameters were measured and the influence of different lights on the serum and retinal dopamine(DA) levels as well as the retinal histopathological tissues was observed.Results:The spectrum of fluorescent light mainly focused at 420-490 nm with the peak value of wavelength near 450 nm,whereas that of full spectrum was wider(400-800 nm) with the peak value near 600 nm.After 4 and 12 weeks,fluorescent group was evidently lower in serum and retinal DA levels(P0.05).Histopathological observation showed that there was significant difference in pigment epithelium layer,photoreceptor and nerve fiber layer between fluorescent group and control group,but the difference among the test groups was not significant.Conclusions:Fluorescent light has certain influence on retinal histological construction and visual performance.However,TCM intervention may have some degree of protective function on retina.

关键词： Full spectrum Artificial luminous environment Retina Dopamine Visual performance Rizhong Yinyang formulas

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Tuning the luminous properties and optical thermometry of Cs_(2)SnCl_(6) phosphor microcrystals via Bi and Sb codoping

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Photonics Research 2021年第11期9卷 2182-2189页

作者： SHUNFA GONG RUIRUI WU SEN YANG LIFANG WU MINMIN ZHANG QIUJU HAN WENZHI WU School of Electronic Engineering Heilongjiang UniversityHarbin 150080China College of Arts and Sciences Northeast Agricultural UniversityHarbin 150030China

The toxicity and instability of lead halide perovskite seriously limit its commercial application in lighting,although it has high photoluminescence(PL)efficiency and adjustable emission.Here,lead-free bismuth(Bi)and antimony(Sb)codoped Cs_(2)SnCl_(6)(BSCSC)microcrystals(MCs)are prepared successfully by a solvothermal method.The PL spectrum is composed of dual emission bands with the peak at 485 and 650 nm,of which relative intensity can be tunable through the change of Bi and Sb feeding contents,respectively.Because of the phonon–electron interaction,the PL intensity is enhanced as the temperature rises within the range of 80–260 K.Then,the nonradiative transition is intensified until 380 K,which results in decrease in PL intensity.Simultaneously,combining with time-resolved PL,it is concluded that the emission peak at 485 nm is attributed to the[Bi_(Sn)+V_(Cl)]as the luminescent centers with the lifetime of hundreds of nanoseconds,and the emission peak at 650 nm is attributed to microsecond-timescale self-trapped excitons.The maximum values of relative sensitivity(S_(R))and absolute sensitivity(S_(A))values obtained are 3.82%K^(-1) and 5.11 ns·K^(-1),which for the first time to our knowledge demonstrate that BSCSC MCs can be novel luminescent materials for developing better optical thermometry.Whitelight-emitting diodes(WLEDs)are constructed using BSCSC MCs only combined with an LED chip,the Commission Internationale de L’Eclairage color coordinates of which are(0.30,0.37).It provides a novel scheme for the lighting field to realize WLEDs without adding additional commercial phosphors.

关键词： attributed luminous absolute

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YAGG:Ce transparent ceramics with high luminous efficiency for solid-state lighting application

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Journal of Advanced Ceramics 2019年第3期8卷 389-398页

作者： Hui HUA Shaowei FENG Zhongyu OUYANG Hezhu SHAO Haiming QIN Hui DING Qiping DU Zhijun ZHANG Jun JIANG Haochuan JIANG School of Materials Science and Engineering Shanghai UniversityShanghai200072China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo315201China School of Materials Science and Engineering Tianjin UniversityTianjin300072China

A series of Y2.985Al5–xGaxO12:0.015Ce(YAGG:Ce,x=0,1,2,3,4,5)transparent ceramics were prepared via a solid-state reaction method.Two-step sintering technique was proved to be an effective approach to prepare functional ceramics with high Ga concentration,and Y3Ga5O12(YGG)transparent ceramic was successfully prepared for the first time.According to the variation of Al/Ga ratio,regulation of band structure and luminescence properties of YAGG:Ce transparent ceramics were effectively investigated.When Ga substitutes Al sites,the tetrahedral site is more favorable compared to the octahedral site for Ga to occupy according to the first-principle calculation.A continuous blue shift of the emission from 565 to 515 nm was achieved as Ga was gradually introduced into Y3Al5O12:Ce matrix.High quality green light was obtained by coupling the YAGG:Ce ceramics with commercial blue InGaN chips.Transparent luminescence ceramics accomplished in this work can be quite prospective for high power LED application.

关键词： YAGG:Ce transparent ceramics two-step sintering Al/Ga ratio luminous efficiency green-emitting LEDs

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Hydrogen sulfide:a luminous future in the postharvest preservation of fruits and vegetables

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Food Materials Research 2022年第1期2卷 27-37页

作者： Ya-Qin Zhao Liang-Yi Zhao Shun-Qing Hu Yuan-Yuan Hou Yong-Hua Zheng Peng Jin College of Food Science and Technology Nanjing Agricultural University1 WeigangNanjing 210095China

Hydrogen sulfide(H_(2)S)has emerged as a signaling molecule that plays a crucial role in the postharvest preservation of fruits and vegetables.This review summarizes the various functions of H_(2)S such as delaying ripening and senescence,enhancing the resistance to cold and disease,and emphasizes the underlying mechanisms.Appropriate concentrations of H_(2)S primarily operate through stimulating the antioxidant system,while showing positive effects on physiological metabolism relevant to storage quality and shelf life including energy,sugar,proline,phenolic,membrane lipid and cell wall metabolism.Moreover,H_(2)S may reduce storage loss by modulating the expression patterns of senescence-related genes,like those linked to ethylene.The coordination of H_(2)S and nitric oxide(NO)combats ethylene-derived negative effects during ripening and senescence.High concentrations of H_(2)S not only act as a regulator to induce disease resistance,but also as a fungicide to inhibit the growth and pathogenicity of fungi.The intricate crosstalk between H_(2)S and other molecules exists via synergistic and antagonistic roles based on protein persulfidation,which is the major signaling process of H_(2)S and appears to compete with other post-translational modifications(PTMs)for the same cysteine residues.This review summarizes H_(2)S synthesis pathways and also discusses the correlation between the signals of H_(2)S,Ca^(2+)and ABA,while highlighting the intrinsic mechanisms of H_(2)S performing its functions in postharvest preservation.

关键词： sulfide luminous synergistic

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From luminous Detail to luminous Debris： Ezra Pound, Gustaf Sobin, and the Modernist Imaginary of Ruins

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Journal of Foreign Languages and Cultures 2018年第1期2卷 8-20页

作者： Patrick Pritchett Westfield State University

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HiFAST:An HIdata calibration and imaging pipeline for FAST

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Science China(Physics,Mechanics & Astronomy) 2024年第5期67卷 182-199页

作者： Yingjie Jing Jie Wang Chen Xu Ziming Liu Qingze Chen Tiantian Liang Jinlong Xu Yixian Cao Jing Wang Huijie Hu Chuan-Peng Zhang Qi Guo Liang Gao Mei Ai Hengqian Gan Xuyang Gao Jinlin Han Ligang Hou Zhipeng Hou Peng Jiang Xu Kong Fujia Li Zerui Liu Li Shao Hengxing Pan Jun Pan Lei Qian Jinghai Sun Ningyu Tang Qingliang Yang Bo Zhang Zhiyu Zhang Ming Zhu National Astronomical Observatories Chinese Academy of SciencesBeijing 100012China Institute for Frontiers in Astronomy and Astrophysics Beijing Normal UniversityBeijing 02206China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China Guizhou Radio Astronomical Observatory Guizhou UniversityGuiyang 55000China Max Planck Institute for Extraterrestrial Physics Garching 85748Germany Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China Institute of Computational Cosmology Department of PhysicsUniversity of DurhamDurham DHI 3LEUK CAS Key Laboratory of FAST National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China Deep Space Exploration Laboratory/Department of Astronomy University of Science and Technology of ChinaHefei 230026China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China Astrophysics Department of PhysicsUniversity of OxfordOxford OX/3RHUK College of Earth Sciences Guilin University of TechnologyGuilin 541004China Department of Physics Anhui Normal UniversityWuhu 241002China School of Astronomy and Space Science Nanjing UniversityNanjing 210023China Key Laboratory of Modern Astronomy and Astrophysics Nanjing UniversityNanjing 20023China

The Five-hundred-meter Aperture Spherical radio Telescope(FAST)has the largest aperture and a 19-beam L-band receiver,making it powerful for investigating the neutral hydrogen atomic gas(HI)in the universe.We present HiFAST(https://hifast.***.io),a dedicated,modular,and self-contained calibration and imaging pipeline for processing the H?data of FAST.The pipeline consists of frequency-dependent noise diode calibration,baseline fitting,standing wave removal using an FFT-based method,flux density calibration,stray radiation correction,and gridding to produce data cubes.These modules can be combined as needed to process the data from most FAST observation modes:tracking,drift scanning,On-The-Fly mapping,and most of their variants.With HiFAST,the root-mean-square(RMS)noises of the calibrated spectra from all 19 beams were only slightly(~5%)higher than the theoretical expectation.The results for the extended source M33 and the point sources are consistent with the results from Arecibo.The moment maps(0,1 and 2)of M33 agree well with the results from the Arecibo Galaxy Environment Survey(AGES)with a fractional difference of less than 10%.For a common sample of 221 sources with signal-to-noise ratio S/N>10 from the Arecibo Legacy Fast ALFA(ALFALFA)survey,the mean value of fractional difference in the integrated flux density,Sint,between the two datasets is approximately 0.005%,with a dispersion of 15.4%.Further checks on the integrated flux density of 23 sources with seven observations indicate that the variance in the flux density of the source with luminous objects(Sint>2.5 Jy km s-1)is less than 5%.Our tests suggest that the FAST telescope,with the efficient,precise,and user-friendly pipeline HiFAST,will yield numerous significant scientific findings in the investigation of the H?in the universe.

关键词： fractional luminous correction

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luminous Shapes with Unusual Motions as Potential Predictors of Earthquakes: A Historical Summary of the Validity and Application of the Tectonic Strain Theory

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International Journal of Geosciences 2013年第2期4卷 387-396页

作者： Michael A. Persinger John S. Derr Laurentian University Sudbury Canada Tijeras New Mexico USA

For centuries and on every continent discrete shapes of lights with unusual motions have preceded earthquakes. The numbers of these lights per interval within a region have been strongly correlated with the amount of seismic energy subsequently released within that region. These temporal intervals range between 3 months and 6 months for areas more than 500 kmin radius and less than a month for smaller radii. Other analyses have shown that the same tectonic strain associated with earthquakes is also associated with the display of luminous events before those earthquakes. This strain can be precipitated by injections of fluids into the crust, natural changes in hydrological loads on rivers, or, purposeful displacement of water into reservoirs. The strengths of the associations are sufficient to allow modest forecasting of earthquakes within the boundaries of the region and the temporal interval of analysis. More accurate utilization of these phenomena as prognosticators of specific earthquakes will require a re-evaluation of the manner by which these data are systematically recorded and interpreted.

关键词： Tectonic Strain luminous Phenomena Earthquake Forecasting Hydrological Loads

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