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Repaired morphology of CO_(2)laser rapid ablation mitigation of fused silica and its influence on downstream light modulation

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Science China(Technological Sciences) 2022年第5期65卷 1116-1126页

作者： TAN Chao Zhao LinJie CHEN MingJun CHENG jian ZHANG Yu ZHANG Jiong yang hao YIN Zhaoyang State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbin150001China Department of Mechanical Engineering National University of SingaporeSingapore117575Singapore

The threat of cascading damage to downstream components caused by the light modulation intensification of laser repaired morphology on the surface of fused silica optics cannot be ignored in high-power laser *** paper uses the angular spectrum diffraction theory based on the analysis of repaired surface morphology of CO_(2)laser rapid ablation mitigation to study the influence of different repaired morphologies on the downstream 355 nm laser *** show that the arc-shaped laser processing lines on the repaired surface are formed by the residual height superposition of the material after laser scanning of two adjacent layers,and the short-pulse laser can substantially suppress the heat-affected zone of the repaired *** offaxis ring caustic and on-axis hotspot are sequentially generated in the downstream modulated light fields of the conical repaired sites with different diameters.A secondary peak with modulation larger than 3 emerges downstream of the modulation ***,the maximum modulation and the secondary peak increase with the diameter and cone angle of the repaired site,and the position of the secondary peak appears farther away from the rear *** modulations of three repaired sites with cone angles of 15°,20°,and 25°can finally be stabilized below ***,the downstream optics should be installed far away from the positions where the maximum modulation and the secondary peak ***,the maximum value and the secondary peak of the downstream light modulation of double repaired sites are larger than that of the single repaired site,and both rise as the repaired sizes ***,large-scale and large-size repairing of multiple surface damages in the same area should be avoided in the laser repairing of fused silica.

关键词： fused silica laser repairing morphology light modulation secondary peak double repaired sites

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An electron donor-acceptor photoactivation strategy for the synthesis of S-aryl dithiocarbamates using thianthrenium salts under mild aqueous micellar conditions

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Chinese Chemical Letters 2023年第11期34卷 124-130页

作者： hao Xu Xufeng Li Jie Ma Junze Zuo Xiuyan Song jian Lv Daoshan yang Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science MOECollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Zhejiang Wansheng Co. Ltd.Linhai 317000China Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology(Ministry of Education) Department of ChemistryTsinghua UniversityBeijing 100084China

An eco-friendly and convenient method is developed herein for the synthesis of S-aryl dithiocarbamates via visible-light-induced SET process of an EDA complex between thianthrenium salt functionalized arenes and dithiocarbamate anions under mild aqueous micellar *** strategy indirectly realizes the method for constructing S-aryl dithiocarbamates through site-selective C−H functionalization of *** importantly,the reaction proceeded smoothly without addition of any photocatalyst,and the by-product thianthrene is recycled in quantity,ultimately minimizing the production of chemical *** protocol provides a promising synthesis candidate for the construction of valuable S-aryl dithiocarbamates,which also opens up a new avenue for micellar photocatalysis.

关键词： S-Aryl dithiocarbamates Visible-light EDA complex Thianthrenium salts Micellar photocatalysis

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Constructing metal-free heterophotocatalyst using two-dimensional carbon nitride sheets and violet phosphorene for highly efficient visible-light photocatalysis

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Journal of Materials Science & Technology 2023年第15期146卷 113-120页

作者： Yong Wang Chengxin Zeng Liting Wu Yalin Dong Yu Zhang Dingyi yang Wen Hu jian hao Hongzhe Pan Rusen yang Academy of Advanced Interdisciplinary Research School of Advanced Materials and NanotechnologyXidian UniversityXi’an 710126China Department of Physics Shaanxi University of Science and TechnologyXi’an 710021China State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering Ningxia UniversityYinchuan 750021China School of Physics and Electronic Engineering Linyi UniversityLinyi 276005China

Two-dimensional(2D)carbon nitride sheets(CNs)with nanoscale thickness have great potential in solar energy conversion owing to their intrinsic ***,their photocatalytic efficiency falls far below the practical requirements because the generated electron-hole pairs rapidly *** construct a metal-free 2D p–n junction heterophotocatalyst from CNs and violet phosphorene(VP)using a simple electrostatic self-assembly *** experimental results and density functional theory calculations show that the built-in electric field of the p–n junction promotes photogenerated carrier transport at the heterojunction interface,thereby promoting the separation of photogenerated electron-hole *** visible-light illumination,the visible-light photocatalytic hydrogen and CO production rates of the CNs/VP heterojunction were increased by 5.85 and 1.51 times,respectively,when compared to that of *** study provides new insights into the design of metal-free heterogeneous photocatalysts with high catalytic activity。

关键词： Heterostructures DFT calculations Visible-light photocatalysis

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Effect of Cl^-Concentration on the Corrosion Behavior of 16Mn Steel in Saturated H2S/CO2 Solution

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Journal of Wuhan University of Technology(Materials Science) 2018年第5期33卷 1205-1215页

作者： SONG Wenming yang Guirong LIAO Bingbing LI jian MA Ying hao Yuan State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China Lanzhou Petroleum Machinery Institute Lanzhou 730000China Wuhan Research Institute of Materials Protection Wuhan 430030China

The corrosion behavior of 16Mn steel was studied in saturated H2S or H2S/CO2 solutions containing different Cl^-concentrations at 80℃.The microstructure and chemical composition of the corrosion products were investigated through scanning electron microscopy,energy-dispersive X-ray spectroscopy,EPMA,and X-ray *** showed that the corrosion rate decreased with increasing Cl^-concentration in saturated H2S or H2S/CO2 solution at pH ***,the corrosion rate increased with increasing Cl^-concentration in saturated H2S solution at pH *** relative H^＋concentration decreased because of the increase of Cl^-concentration at pH 4,and Cl^-acted as a catalyst in the corrosive medium at pH 6 because the net H^＋concentration decreased obviously compared with the condition at ***^-promoted the formation of Fe-deficient iron sulfide at pH 4,and the opposite effect was observed in the nearly neutral *** corrosion rate increased firstly with increasing Cl^-concentration and then decreased in the saturated H2S/CO2solution at pH *** corrosion products were mainly composed of two kinds of iron *** FeS（1-x） was a kind of tetragonal crystal,whereas the other was the hexagonal/monoclinic iron sulfide Fe（1-x）*** corrosion film that was mainly composed of FeS（1-x） did not confer a protective effect on the base *** atomic ratio of Fe/S was more than 1 for FeS（1-x）.The appearance of sulfide FeS（1-x） resembled a square block or small,needlelike,flocculent *** atomic ratio of Fe/S was less than 1 for Fe（1-x）S,and the corrosion film mainly composed of Fe（1-x）S conferred some protective property on the base *** sulfide FeS（1-x） exhibited a long claviform morphology with a hexagonal or quadrilateral cross-sectional shape.

关键词： 16Mn steel acid corrosion weight loss microstructure corrosion products

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cDNA Cloning of Heat Shock Protein Genes and Their Expression in an Indigenous Cryptic Species of the Whitefly Bemisia tabaci Complex from China

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Journal of Integrative Agriculture 2012年第2期11卷 293-302页

作者： YU hao WAN Fang-hao GUO jian-ying State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant Protection Chinese Academy of Agricultural Sciences Beijing 100081 P.R. China Department of Entomology Henan Institute of Science and Technology Xinxiang 453003 P.R.China

Thermal adaptation plays a fundamental role in shaping the distribution and abundance of insects,and heat shock proteins（Hsps）play important roles in the temperature adaptation of various *** better understand the temperature tolerance of the indigenous ZHJ2-biotype of whitefly Bemisia tabaci species complex,we obtained complete cDNA sequences for hsp90,hsp70,and hsp20 and analyzed their expression profiles under different high temperature treatments by real-time quantitative polymerase chain *** high temperature tolerance of *** ZHJ2-biotype was determined by survival rate after exposure to different high temperatures for 1 *** results showed that after 41°C heat-shock treatment for 1 h,the survival rates of ZHJ2 adults declined significantly and the estimated temperature required to cause 50% mortality（LT50）is 42.85°C for 1 *** for onset（Ton）or maximal（Tmax）induction of hsps expression in *** ZHJ2-biotype were 35 and 39°C（or 41°C）.Compared with previous studies,indigenous ZHJ2-biotype exhibits lower heat temperature stress tolerance and Ton（or Tmax）than the invasive B-biotype.

关键词： Bemisia tabaci biological invasion thermotolerance indigenous and invasive biotypes heat shock protein (hsp)

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Myelotomy promotes locomotor recovery in rats subjected to spinal cord injury： a meta-analysis of six randomized controlled trials

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Neural Regeneration Research 2018年第6期13卷 1096-1106页

作者： Chuan Qin Wen-hao Zhang De-Gang yang Ming-Liang yang Liang-Jie Du jian-Jun Li School of Rehabilitation Medicine. Capital Medical University Beijing China Department of Spinal and Neural Functional Reconstruction China Rehabilitation Research Center Beijing China Beijing Key Laboratory of Neural Injury and Rehabilitation Beijing China China Rehabilitation Science Institute Beijing China Center of Neural Injury and Repair Beijing Institute for Brain Disorders Beijing China

OBJECTIVE： To investigate the effects of myelotomy on locomotor recovery in rats subjected to spinal cord injury. DATA SOURCES： Electronic databases including Pub Med, Science Citation Index, Cochrane Library, China National Knowledge Infrastructure, Chinese Journals Full-text Database, China Biology Medicine disc, and Wanfang Database were searched to retrieve related studies published before September 2017. The Me SH terms（the Medical Subject Headings） such as ＂myelotomy＂, ＂spinal cord injuries＂, ＂rats＂, ＂randomized controlled trial＂ and all related entry terms were searched. DATA SELECTION： Randomized controlled trials using myelotomy for the treatment of acute spinal cord injury in rats were included. Basso, Beattie, and Bresnahan scores were adopted as the evaluation method. Rev Man Software（version 5.3） was used for data processing. The χ^2 and I^2 tests were used to assess heterogeneity. Using a random-effects model, a subgroup analysis was conducted to analyze the source of the heterogeneity. OUTCOME MEASURES： Basso, Beattie, and Bresnahan scores were observed 1–6 weeks after spinal cord ***： Six animal trials were included, using a total of 143 lab rats. The included trials were divided into two subgroups by injury degrees（moderate or severe）. The pooled results showed that, 1–6 weeks after spinal cord injury, the overall Basso, Beattie, and Bresnahan score was significantly higher in the myelotomy group than in the contusion group（weighted mean difference（WMD） = 0.60; 95% confidence interval（CI）： 0.23–0.97; P = 0.001; WMD = 2.10; 95% CI： 1.56–2.64; P 〈 0.001; WMD = 2.65; 95% CI： 1.73–3.57; P 〈 0.001; WMD = 1.66; 95% CI： 0.80–2.52; P 〈 0.001; WMD = 2.09; 95% CI： 0.92–3.26, P 〈 0.001; WMD = 2.25; 95% CI： 1.06–3.44, P 〈 0.001）. The overall heterogeneity was high（I^2 = 85%; I^2 = 95%; I^2 = 94%; I^2 = 88%; I^2 = 91%; I^2 = 89%）. The results in the moderate injury subgroup showed that Basso, Beattie, and Bresnahan scores were significantly higher in

关键词： nerve regeneration spinal cord injury myelotomy locomotor recovery rats rehabilitation moderate injury randomized controlled trials systematic review meta-analysis neural regeneration

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A micro-chip exploding foil initiator based on printed circuit board technology

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Defence Technology（防务技术） 2022年第8期18卷 1435-1444页

作者： Zhi yang Peng Zhu Qing-yun Chu Qiu Zhang Ke Wang hao-tian jian Rui-qi Shen School of Chemical Engineering Nanjing University of Science and TechnologyNanjing210094China Micro-Nano Energetic Devices Key Laboratory Ministry of Industry and Information TechnologyNanjing210094China

Conventional exploding foil initiator (EFI) in ignition or detonation applications hosts many performance advantages, but was hindered by the bulky, inaccurate, inefficient and expensive shortcomings. We highlight a novel micro-chip exploding foil initiator (McEFI) using printed circuit board (PCB) technology. The structural parameters were determined based on energy coupling relationship at the component interfaces. Next, the prototype McEFI has been batch-fabricated using PCB technology, with a monolithic structure of 7.0 mm (l) × 4.5 mm (w) × 4.0 mm (δ). As expected, this PCB-McEFI illustrated the successful firing validations for explosives pellets. This paper has addressed the cost problem in both military munitions and civil markets wherever reliable, insensitive and timing-dependent ignition or detonation are involved.

关键词： Exploding foil initiator Printed circuit board Monolithic structure Firing validations

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Effects of cavitation on vortex-induced vibration of a flexible circular cylinder simulated by fluid-structure interaction method

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Journal of Hydrodynamics 2022年第3期34卷 499-509页

作者： Zhi-jian Xiao Shi-hao yang Cao Yu Zhen Zhang Lei Sun jiang Lai Yan-ping Huang Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing100190China Nuclear Power Institute of China Chengdu610041China Beijing Electro-mechanical Engineering Institute Beijing100074China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang050043China

To investigate the effects of the cavitation on the vortex-induced vibration,the flow and the vibration characteristics of a flexible circular cylinder in the non-cavitating and cavitating flows at Re=200 are simulated using a fluid-structure interaction(FSI)solver,developed in the OpenFOAM *** accuracy of the fluid-structure interaction solver is verified using the benchmark *** a freely vibrating circular cylinder,the characteristics of the vortex-induced vibration are determined at different frequency *** frequency lock-in is observed in both the cavitating flow and the non-cavitating flow,and the lock-in frequency range is larger in the cavitating flow with a smaller vibration *** the lock-in frequency range,due to the reduction of the fluid forces and the resonance effects at the dominant frequency,the vibration amplitude is decreased in the cavitating flow,as compared to the non-cavitating ***,the low-density vapor and the cavitation collapse weaken the constraints of the flow and the stability of the shedding vortices,respectively,making the flow around the circular cylinder more sensitive to the structural ***,the lock-in frequency range is larger in the cavitating flow.

关键词： Fluid-structure interaction(FSI) cavitation lock-in frequency vortex-induced vibrations OpenFOAM

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Composite structure Al_(2)O_(3)/Al_(2)O_(3)-YAG:Ce/YAG ceramics with high color spatial uniformity for white laser lighting

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Journal of Advanced Ceramics 2024年第2期13卷 189-197页

作者： Pengfei Sang Le Zhang jian Kang Mingzhou Li Shiwei Chen Peng yang Bingheng Sun yang Li Wieslaw Strek hao Chen jiangsu Key Laboratory of Advanced Laser Materials and Devices School of Physics and Electronics EngineeringJiangsu Normal UniversityXuzhou 221116China jiangsu Xiyi Advanced Materials Research Institute of Industrial Technology Xuzhou 221400China Xuzhou EAGLED Technology Co. Ltd.Xuzhou 221116China Xuzhou Kangna Advanced Materials Technology Co. Ltd.Xuzhou 221116China Xuzhou Fuchang Electronic Technology Co. Ltd.Xuzhou 221116China Shanghai Institute of Optics Fine Mechanics Chinese Academy of SciencesShanghai 201800China School of Material Science and Engineering Shanghai Institute of TechnologyShanghai 201418China State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China Institute of Low Temperature and Structure Research Polish Academy of SciencesWroclaw 50-422Poland

Composite ceramic phosphor(CCP)is a candidate light-conversion material to obtain the high-quality laser lighting *** based on the transmissive configuration model could not simultaneously meet the requirements of angular color uniformity and high thermal *** this study,a novel composite structure ceramic was designed,including Al_(2)O_(3)-YAG:Ce/YAG layered ceramic with a size of 1 mm×1 mm for lighting,and Al_(2)O_(3) ceramic(φ=16.0 mm)was used as the wrapping material due to its outstanding thermal *** prepared ceramics exhibited excellent thermal performance and no yellow ring *** this design,we achieved the match of the intensity distribution of the blue and yellow lights,resulting in a high angular color uniformity of 0.9 with a view angle of±80°.All ceramics showed no luminous saturation phenomenon,even the laser power density was increased up to 47.51 W/mm^(2).A high-brightness white-light source with a luminous flux of 618 lm,a luminous efficiency of 126 lm/W,a CCT of 6615 K,and a CRI of 69.9 was obtained in the transmissive *** particular,the surface temperature of the ceramic was as low as 74.1℃ under a high laser radiation(47.51 W/mm^(2)).These results indicate that Al_(2)O_(3)/Al_(2)O_(3)-YAG:Ce/YAG composite structure ceramic is a promising luminescent material in the high-power laser lighting applications.

关键词： Al_(2)O_(3)/Al_(2)O_(3)-YAG:Ce/YAG angular color uniformity high thermal stability high-power laser lighting

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Texture development and properties of Ti-IF steels produced by different hot-rolling processes

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Journal of Iron and Steel Research International 2019年第3期26卷 310-320页

作者： Lei-lei hao Lang Li Chen-yang Qiu jian-gong Wang Xun Zhou Yong-lin Kang School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Shougang Jingtang United Iron and Steel Co. Ltd.Tangshan 063200HebeiChina

Texture is a pivotal factor for the deep drawability of interstitial free steel (IF steel). The evolution of microstructure and recrystallization texture of Ti-IF steel through the processing of hot rolling, cold rolling and annealing have been studied. The mechanical properties including strain hardening index n and plastic strain ratio r are also measured. For comparison, ferrite rolling and austenite rolling are both studied. The results show that the intensity of γ-fiber after ferrite rolling is higher than that after austenite rolling. The great balance between the {111}〈110〉 and {111}〈112〉 leads to low △r value after annealing. The size of precipitates in ferrite rolled sample is generally larger than that in austenite rolled sample. Compared to austenite rolled sample, the ferrite rolled and annealed one has better formability and its r value reaches 2.36. Different from laboratory production, the test steels were acquired from industrial trial, and all the result can be used in industrial production directly.

关键词： Ti-IF steel Ferrite rolling Austenite rolling Microstructure Texture

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