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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

果蔗生物降解地膜覆盖栽培技术要点及发展建议

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甘蔗糖业 2022年第4期51卷 43-47页

作者：黄瑶珠陈明周谢东杨友军李发勇张文桦广东省科学院生物与医学工程研究所广东广州510316 广东省生物材料工程技术研究中心广东广州510316

为了解决广东省果蔗地膜覆盖存在的白色污染,促进生物降解地膜在果蔗的推广应用,本文总结广东省果蔗生物降解地膜覆盖高产栽培技术要点,包括选地、选种、种芽处理、播种、整地、施肥、盖膜、田间管理及适时收获等方面。同时提出该技术... 详细信息

为了解决广东省果蔗地膜覆盖存在的白色污染,促进生物降解地膜在果蔗的推广应用,本文总结广东省果蔗生物降解地膜覆盖高产栽培技术要点,包括选地、选种、种芽处理、播种、整地、施肥、盖膜、田间管理及适时收获等方面。同时提出该技术存在的问题、推广应用前景及发展建议。

关键词：果蔗地膜生物降解技术要点发展建议

Intense and Superflat White Laser with 700-nm 3-dB Bandwidth and 1-mJ Pulse Energy Enabling Single-Shot Subpicosecond Pulse Laser Spectroscopy

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Research 2024年第2期6卷 319-327页

作者： Lihong Hong Haiyao Yang Liqiang Liu mingzhou Li Yuanyuan Liu Baoqin chen Huakang Yu Wenbo Ju Zhi-Yuan Li School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510641China State Key Laboratory of Luminescent Materials and Devices South China University of TechnologyGuangzhou 510640China

An optical spectrometer is a basic spectral instrument that probes microscopic physical and chemical properties of macroscopic objects but generally suffers from difficulty in broadband time-resolved *** this work,we report the creation of ultrabroadband white-light laser with a 3-dB bandwidth covering 385 to 1,080 nm,pulse energy of 1.07 mJ,and pulse duration of several hundred femtoseconds by passing 3-mJ pulse energy,50-fs pulse duration Ti:Sapphire pulse laser through a cascaded fused silica plate and chirped periodically poled lithium niobate *** utilize this unprecedented superflat,ultrabroadband,and intense femtosecond laser light source to build a single-shot(i.e.,single-pulse)subpicosecond pulse laser ultraviolet-visible-near-infrared spectrometer and successfully measure various atomic and molecular absorption *** single-shot ultrafast spectrometer may open up a frontier to monitor simultaneously the ultrafast dynamics of multiple physical and chemical processes in various microscopic systems.

关键词： Pulse utilize frontier

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PBAT全生物降解地膜的田间应用效果研究

甘蔗糖业 2024年第5期53卷 22-32页

作者：张会平黄瑶珠陈明周李发勇杨友军潘东英谢东广东省科学院生物与医学工程研究所广东广州510316 广东省生物材料工程技术研究中心广东广州510316

为筛选适宜南方地区的番薯专用全生物降解地膜,以番薯品种“一点红”为供试材料,设置3种全生物降解地膜、普通聚乙烯(PE)地膜和不盖膜5个处理,采用傅里叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)、差示扫描量热仪(DSC)探究了全生物降... 详细信息

为筛选适宜南方地区的番薯专用全生物降解地膜,以番薯品种“一点红”为供试材料,设置3种全生物降解地膜、普通聚乙烯(PE)地膜和不盖膜5个处理,采用傅里叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)、差示扫描量热仪(DSC)探究了全生物降解地膜在番薯田间覆盖过程中结构、形态和性能的变化。通过测定番薯的农艺性状和产量指标,研究不同处理对秋植番薯生长和产量的影响。结果表明:3种全生物降解地膜在宏观上表现显著降解效果,其失重率为40.78%~64.22%,降解进程与番薯生长与结薯过程基本吻合。FTIR显示:在光氧化、水解、酶解等的作用下,聚对苯二甲酸-己二酸丁二醇酯(PBAT)分子链发生了断裂,地膜发生降解;SEM图像显示:随降解间延长,地膜表面逐渐出现裂纹和孔洞结构。DSC结果显示:PBAT的降解会先发生在无定形区,结晶度增大,导致其玻璃化温度(Tg)和熔点(Tm)有所升高。3种全生物降解地膜的降解速度对比结果为:#8037>#8039>#8038。全生物降解地膜在秋植番薯覆盖应用上,不会影响番薯生长及结薯,其中,#8039的降解速度更吻合番薯生长阶段,产量最高。全生物降解地膜具有良好的降解特性,可有效解决农田残膜污染,有利于改善农田生态环境,建议选用#8039全生物降解地膜替代普通聚乙烯(PE)地膜,在广东省秋植番薯生产上推广应用。

关键词：全生物降解地膜 PBAT 田间应用效果番薯降解特征产量

Interannual variability and climatic sensitivity of global wildfire activity

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Advances in Climate Change Research 2021年第5期12卷 686-695页

作者： Rongyun TANG Jiafu MAO mingzhou JIN Anping chen Yan YU Xiaoying SHI Yulong ZHANG Forrest M.HOFFMAN Min XU Yaoping WANG Institute for a Secure and Sustainable Environment University of TennesseeKnoxville37996USA Environmental Sciences Division and Climate Change Science Institute Oak Ridge National LaboratoryOak Ridge37830USA Department of Biology and Graduate Degree Program in Ecology Colorado State UniversityFort Collins80523USA Atmospheric and Oceanic Sciences Program Princeton UniversityPrinceton08544USA Computational Sciences and Engineering Division and Climate Change Science Institute Oak Ridge National LaboratoryOak Ridge37830USA

Understanding historical wildfire variations and their environmental driving mechanisms is key to predicting and mitigating wildfires. However, current knowledge of climatic responses and regional contributions to the interannual variability (IAV) of global burned area remains limited. Using recent satellite-derived wildfire products and simulations from version v1.0 of the land component of the U.S. Department of Energy's Energy Exascale Earth System Model (E3SM land model [ELM] v1) driven by three different climate forcings, we investigated the burned area IAV and its climatic sensitivity globally and across nine biomes from 1997 to 2018. We found that 1) the ELM simulations generally agreed with the satellite observations in terms of the burned area IAV magnitudes, regional contributions, and covariations with climate factors, confirming the robustness of the ELM to the usage of different climate forcing sources;2) tropical savannas, tropical forests, and semi-arid grasslands near deserts were primary contributors to the global burned area IAV, collectively accounting for 71.7%–99.7% of the global wildfire IAV estimated by both the satellite observations and ELM simulations;3) precipitation was a major fire suppressing factor and dominated the global and regional burned area IAVs, and temperature and shortwave solar radiation were mostly positively related with burned area IAVs;and 4) noticeable local discrepancies between the ELM and remote-sensing results occurred in semi-arid grasslands, croplands, boreal forests, and wetlands, likely caused by uncertainties in the current ELM fire scheme and the imperfectly derived satellite observations. Our findings revealed the spatiotemporal diversity of wildfire variations, regional contributions and climatic responses, and provided new metrics for wildfire modeling, facilitating the wildfire prediction and management.

关键词： Wildfire Burned area Climatic sensitivity E3SM land model Global fire emission database

Snapshot of Structural Variations in the Tibetan Wild Boar Genome at Single-Nucleotide Resolution

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Journal of Genetics and Genomics 2014年第12期41卷 653-657页

作者： Lei chen Long Jin mingzhou Li Shilin Tian Tiandong Che Qianzi Tang Jing Lan Zhi Jiang Ruiqiang Li Yiren Gu Xuewei Li Jinyong Wang Chongqing Academy of Animal Sciences Key Laboratory of Pig Industry Sciences Ministry of Agriculture Institute of Animal Genetics and Breeding college of Animal Science and Technology Sichuan Agricultural University Novogene Bioinjormatics Institute Sichuan Ammal Science Academy

Genomic structural variations （SVs）, particularly insertions, deletions and inversions, can contribute to the heterogeneity of millions of nucleotides within a genome, and are likely to make an important contribution to biological diversity and phenotypic variation （Alkan et al., 2011; Bickhart and Liu, 2014）. With the rapid development of the next-generation sequencing technologies and the new assembly methodolo- gies, the multiple de novo assemblies of genomes within a species allow researchers to explore more detailed SV maps （Li et al., 2011）. Compared with the traditional read depth algorithm using the whole-genome resequencing approach and array-based technologies （Baker, 2012; Wang et al., 2012;

关键词： gene Snapshot of Structural Variations in the Tibetan Wild Boar Genome at Single-Nucleotide Resolution

Genome-wide analysis reveals selection for Chinese Rongchang pigs

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Frontiers of Agricultural Science and Engineering 2017年第3期4卷 319-326页

作者： Lei chen Shilin TIAN Long JIN Zongyi GUO Dan ZHU Lan JING Tiandong CHE Qianzi TANG Siqing chen Liang ZHANG Tinghuan ZHANG Zuohua LIU Jinyong WANG mingzhou LI Key Laboratory of Pig Industry Sciences Ministry of AgricultureChongqing Academy of Animal Sciences Institute of Animal Genetics and Breeding/College of Animal Science and Technology Sichuan Agricultural University

Livestock have undergone domestication and consequently strong selective pressure on genes or genomic regions that control desirable traits. To identify selection signatures in the genome of Chinese Rongchang pigs, we generated a total of about 170 Gb of DNA sequence data with about 6.4-fold coverage for each of six female individuals. By combining these data with the publically available genome data of 10 Asian wild boars,we identified 449 protein-coding genes with selection signatures in Rongchang pigs, which are mainly involved in growth and hormone binding, nervous system development, and drug metabolism. The accelerated evolution of these genes may contribute to the dramatic phenotypic differences between Rongchang pigs and Chinese wild boars. This study illustrated how domestication and subsequent artificial selection have shaped patterns of genetic variation in Rongchang pigs and provides valuable genetic resources that can enhance the use of pigs in agricultural production and biomedical studies.

关键词： domestication genome pig re-sequencing selection

Spatiotemporal dynamics of ecosystem fires and biomass burning-induced carbon emissions in China over the past two decades

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Geography and Sustainability 2020年第1期1卷 47-58页

作者： Anping chen Rongyun Tang Jiafu Mao Chao Yue Xiran Li Mengdi Gao Xiaoying Shi mingzhou Jin Daniel Ricciuto Sam Rabin Phillippe Ciais Shilong Piao Department of Biology Colorado State UniversityFort CollinsCO 80523USA Graduate Degree Program in Ecology Colorado State UniversityFort CollinsCO 80523USA Department of Industrial and Systems Engineering University of TennesseeKnoxvilleTN 37996USA Environmental Sciences Division and Climate Change Science Institute Oak Ridge National LaboratoryOak RidgeTN 37831USA State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest Agriculture&Forestry UniversityYanglingShanxi 712100China College of Urban and Environmental Sciences Central China Normal UniversityWuhanHubei 430079China Sino-French Institute for Earth System Science College of Urban and Environmental SciencesPeking UniversityBeijing 100871China Atmospheric Environmental Research(IMK-IFU) Institute of Meteorology and Climate ResearchKarlsruhe Institute of Technology(KIT)Kreuzeckbahnstraße 19Garmisch-Partenkirchen 82467Germany LSCE UMR CEA-CNRSBat.709CEL’Orme des MerisiersGif-sur-Yvette 91191France

Fire is a major type of disturbance that has important influences on ecosystem dynamics and carbon *** our understanding of ecosystem fires and their carbon cycle consequences is still limited,largely due to the difficulty of large-scale fire monitoring and the complex interactions between fire,vegetation,climate,and anthropogenic ***,using data from satellite-derived fire observations and ecosystem model simulations,we performed a comprehensive investigation of the spatial and temporal dynamics of China’s ecosystem fire disturbances and their carbon emissions over the past two decades(1997–2016).Satellite-derived results showed that on average about 3.47-4.53×10^(4) km^(2) of the land was burned annually during the past two decades,among which annual burned forest area was about 0.81-1.25×10^(4) km^(2),accounting for 0.33-0.51%of the forest area in *** burning emitted about 23.02 TgC per *** to satellite products,simulations from the Energy Exascale Earth System Land Model(ELM)strongly overestimated China’s burned area and fire-induced carbon *** burned area and fire-induced carbon emissions were high for boreal forest in Northeast China’s Daxing’anling region and subtropical dry forest in South Yunnan,as revealed by both the satellite product and the model *** results suggest that climate and anthropogenic factors play critical roles in controlling the spatial and seasonal distribution of China’s ecosystem fire *** findings highlight the importance of multiple complementary approaches in assessing ecosystem fire disturbance and its carbon *** studies are required to improve the methods of observing and modelling China’s ecosystem fire disturbances,which will provide valuable information for fire management and ecosystem sustainability in an era when both human activities and the natural environment are rapidly changing.

关键词： Fire emission Burned area Fire models China

Longitudinal virological changes and underlying pathogenesis in hospitalized COVID-19 patients in Guangzhou,China

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Science China(Life Sciences) 2021年第12期64卷 2129-2143页

作者： Zhengtu Li Yinhu Li Ruilin Sun Shaoqiang Li Lingdan chen Yangqing Zhan mingzhou Xie Jiasheng Yang Yanqun Wang Airu Zhu Guoping Gu Le Yu Shuaicheng Li Tingting Liu Zhaoming chen Wenhua Jian Qian Jiang Xiaofen Su Weili Gu Liyan chen Jing cheng Jincun Zhao Wenju Lu Jinping Zheng Shiyue Li Nanshan Zhong Feng Ye State Key Laboratory of Respiratory Disease National Clinical Research Center for Respiratory DiseaseGuangzhou Institute of Respiratory Healththe First Affiliated Hospital of Guangzhou Medical UniversityGuangzhou 510120China Beijing YuanShengKangTai(ProtoDNA)Genetech Co. Ltd.Beijing 100190China Department of Pulmonary and Critical Care Medicine Guangdong Second Provincial General HospitalGuangzhou 510317China Department of Computer Science City University of Hong KongHong Kong 999077China

Prolonged viral RNA shedding and recurrence of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)in coronavirus disease 2019(COVID-19)patients have been ***,the clinical outcome and pathogenesis remain *** this study,we recruited 43 laboratory-confirmed COVID-19 *** found that prolonged viral RNA shedding or recurrence mainly occurred in severe/critical patients(P<0.05).The average viral shedding time in severe/critical patients was more than 50 days,and up to 100 days in some patients,after symptom ***,chest computed tomography gradually improved and complete absorption occurred when SARS-CoV-2 RT-PCR was still positive,but specific antibodies ***,the viral shedding time significantly decreased when the A1,430G or C12,473T mutation occurred(P<0.01 and FDR<0.01)and increased when G227A occurred(P<0.05 and FDR<0.05).High IL1R1,IL1R2,and TNFRSF21 expression in the host positively correlated with viral shedding time(P<0.05 and false discovery rate<0.05).Prolonged viral RNA shedding often occurs but may not increase disease *** viral RNA shedding is associated with viral mutations and host factors.

关键词： SRAS-CoV-2 longitudinal virological changes viral genome host gene expression