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Environmental Protection and Energy Color Changing Clothing Design under the Background of Sustainable Development

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Journal of Renewable Materials 2022年第11期10卷 2717-2728页

作者： Jingyu dai Hongyu dai Yutong Xie T.Indumathi College of Art Design and Media Sanda UniversityShanghai201209China Data science institute Vanderbilt UniversityNashville37212USA Center of Art Education Shanghai University of Medicine&Health SciencesShanghai201318China PSG College of Technology Coimbatore641004India

In order to promote the application of clean energy technology in clothing and promote the integration of industrial development and artificial intelligence wearable technology,this study elaborates the energy application characteristics of intelligent wearable products at home and abroad and its application in different fields,aiming at the current research status of wearable technology in the field of textile and *** wearable distributed generation technology is classified,and a creative clothing design for detecting climate temperature is *** on the monitoring of body temperature,the changes in clothing pattern color can reflect people’s health and emotional *** the same time,it can also be applied to the screening of abnormal body temperature during the COVID-19.

关键词： Clean energy temperature variable materials wearable clothing design

On-demand molecular design for efficient blue phosphorescence

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Science China Chemistry 2024年第7期67卷 2124-2126页

作者： Meiqi dai Dongpeng Yan Beijing Key Laboratory of Energy Conversion and Storage Materials Key Laboratory of RadiopharmaceuticalsMinistry of EducationCollege of ChemistryBeijing Normal UniversityBeijing 100875China

Blue luminescence(including both fluorescence and phosphorescence)is one of the core elements in solid-state lighting and full-color *** to now,ultralong room temperature phosphorescence(RTP)with a long lifetime over 0.1 s has been continuously *** ultralong phosphorescence emission bands are in the region of 500 to600 ***,high-energy blue phosphorescence remains an immense challenge[1].

关键词： blue lifetime bands

Neighborhood predictors of short sleep duration and bedtime irregularity among children in the United States: results from the 2019-2020 National Surveyof Children's Health

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World Journal of Pediatrics 2024年第1期20卷 73-81页

作者： Ying dai Jianghong Liu School of Nursing University of Pennsylvania418 Curie Blvd.Room 426Claire M.Fagin HallPhiladelphiaPA19104-6096USA

Background Environmental factors may contribute to short sleep duration and irregular bedtime in *** factors and children's sleep duration and bedtime regularity remain a less investigated *** aim of this study was to investigate the national and state-level proportions of children with short sleep duration and irregular bedtime and their neighborhood *** A total of 67,598 children whose parents completed the National Survey of Children's Health in 2019-2020 were included in the ***-weighted Poisson regression was used to explore the neighborhood predictors of children's short sleep duration and irregular *** The prevalence of short sleep duration and irregular bedtime among children in the United States(US)was 34.6%[95%confidence interval(CI)=33.8%-35.4%]and 16.4%(95%CI=15.6%-17.2%)in 2019-2020,*** neighborhoods,supportive neighborhoods,and neighborhoods with amenities were found to be protective factors against children's short sleep duration,with risk ratios ranging between 0.92 and 0.94,P<*** with detracting elements were associated with an increased risk of short sleep duration[risk ratio(RR)=1.06,95%CI=1.00-1.12]and irregular bedtime(RR=1.15,95%CI=1.03-1.28).Child race/ethnicity moderated the relationship between neighborhood with amenities and short *** Insufficient sleep duration and irregular bedtime were highly prevalent among US children.A favorable neighborhood environment can decrease children's risk of short sleep duration and irregular *** the neighborhood environment has implications for children's sleep health,especially for children from minority racial/ethnic groups.

关键词： Child National Survey of Children's Health Neighborhood.Sleep Social determinants of health

Channel model of pinhole gamma camera

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Chinese Science Bulletin 2011年第25期56卷 2758-2763页

作者： dai QiuSheng Suzhou Institute of Biomedical Engineering and Technology Chinese Academy of Sciences Suzhou 215163 China

The pinhole gamma camera is the basis of the newly developed method of high-resolution pinhole single photon emission computed tomography (SPECT). In this paper, a pinhole gamma camera system was examined using the channel model of information theory. The model pinhole gamma camera was simplified from a noisy, lossy channel to a noiseless, lossless channel by assuming a plane source. An approximate formula of average mutual information for the pinhole gamma camera was then derived from the model. Imaging experiments validated the applicability of the analytic formula. The findings demonstrated that the pinhole gamma camera can be adequately described using the channel model of information theory, and that average mutual information can be considered a figure of merit for the optimizing design of the pinhole gamma camera.

关键词：相机系统针孔伽玛渠道信息理论 SPECT 计算机断层单光子发射

Drivers of soil erosion and subsurface loss by soil leakage during karst rocky desertification in SW China

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International Soil and Water Conservation Research 2022年第2期10卷 217-227页

作者： Xudong Peng Quanhou dai College of Forestry Guizhou UniversityGuiyang550025China Institute of Soil Erosion and Ecological Restoration Guizhou UniversityGuiyang550025China The Key Laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region(Ministry of Education) Collaborative Innovation Center for Mountain Ecology&Agro-Bioengineering(CICMEAB)Research Center of Soil Erosion and Ecological RestorationGuizhou UniversityGuiyang550025China

As an extreme manifestation of environmental degradation,karst rock desertification is caused by soil loss and rock *** some areas with serious rocky desertification,there is no soil to be eroded or *** soil loss in these areas superimposes soil erosion and unique subsurface loss by soil leakage through fissures,pipelines,sinkholes,etc.,which directly reduce soil resources and accelerate rocky ***,the factors driving soil erosion and subsurface loss by soil leakage are still *** experiments were conducted on simulated slopes with surface-exposed bedrock and subsurface fissures based on field investigations in a karst rocky desertification area of Guizhou Province,*** factors,including rainfall intensity,slope gradient,bedrock exposure rate and subsurface fissure degree,were considered in the *** found that the amount of soil surface erosion and subsurface leakage loss is driven not only by the runoff volume but also by other influential *** intensity is the driving factor determining the amount of surface erosion and subsurface leakage loss of soil and water and the relationship between *** slope gradient plays a leading role only in subsurface fissure flow leakage *** bedrock exposure rate drives the surface soil erosion rate,shows a critical value(30%),and dominates the fissure flow leakage loss *** fissure density plays an important role in the surface loss of soil and water;however,an increase in the subsurface fissure density does not obviously accelerate the subsurface leakage loss of soil and *** this result,obtained from laboratory simulations,may differ at the field scale or larger,it could provide a foundation for systematic studies on soil erosion/leakage and insights into the relations between rocky desertification and soil erosion/leakage and their driving factors in karst rocky desertification.

关键词： Driving factors Karst rocky desertification Soil erosion Subsurface leakage Southwest China

Hyperbolicity of C^1 -star invariant sets for C^1 -class dynamical systems

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Science China Mathematics 2011年第2期54卷 269-280页

作者： dai XiongPing Department of Mathematics Nanjing University Nanjing 210093 China

In this paper, we simply prove, in the framework of Liao, the hyperbolicity of C 1 -star invariant sets of C 1 -class differential systems on a closed manifold of dimension≤ 4, without using the C 1 -connecting lemma... 详细信息

关键词： autonomous differential system star property hyperbolicity

Tunable spatial-frequency-shift 3D nanoscopy with chip compatibility overcomes the diffraction limit of the linear optical imaging system

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Science China(Physics,Mechanics & Astronomy) 2021年第9期64卷 125-126页

作者： Ning dai Shanghai Institute of Technical Physics Chinese Academy of SciencesShanghai 200083China

The superresolution microscopy that broadens the detection range in the spatial frequency domain through the spatialfrequency-shift(SFS)effect[1-5]shows intriguing advantages including a large field of view,high speed,and good ***,it captures pictures in the wide-field mode and allows a universal implementation without using special fluorophores *** enable the sub-diffraction resolution in the SFS microscopy,it is essential to use the evanescent wave illumination with a large wave vector,which can be built on the integrated photonic configuration,paving the way for a compact nanoscopy on a thin chip[6-8].However,the lack of an approach to actively tune the SFS value in a large range hampers the progress to achieve deep-subwavelength resolution through evanescent illumination with ultra-large wave *** the wave vector of the illumination surpasses twice the cutoff frequency of the objective,a missing band exists between the shifted components and the zeroth component in the spatial frequency domain,which causes severe artifacts and a distortion in the *** a result,the resolution of current linear SFS microscopy has been restricted less than thrice the Abbe diffraction limit of the detection system.

关键词： illumination limit overcome

Role of Ocean Dynamics in the Seasonal Hadley Cell:A Response to Idealized Arctic Amplification

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Advances in Atmospheric Sciences 2023年第12期40卷 2211-2223页

作者： Haijin dai Qiang YAO College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China

How atmospheric and oceanic circulations respond to Arctic warming at different timescales are revealed with idealized numerical *** by local forcing and feedback,Arctic warming appears and leads to sea-ice ***-water formation is inhibited,which weakens the Atlantic Meridional Overturning Circulation(AMOC).The flow and temperature in the upper layer does not respond to the AMOC decrease immediately,especially at mid-low ***,nearly uniform surface warming in mid-low latitudes enhances(decreases)the strength(width)of the Hadley cell(HC).With the smaller northward heat carried by the weaker AMOC,the Norwegian Sea cools *** strong warming in Northern Hemisphere high latitudes,the long-term response triggers the“temperature-wind-gyre-temperature”cycle,leading to colder midlatitudes,resulting in strong subsidence and Ferrel cell enhancement,which drives the HC *** weaker warming in the tropics and stronger warming at high latitudes,there is a stronger HC with decreased width.A much warmer Southern Hemisphere appears due to a weaker AMOC that also pushes the HC *** idealized model results suggest that the HC strengthens under both warming conditions,as tropical warming determines the strength of the HC ***,extreme Arctic warming led by artificially reduced surface albedo decreases the meridional temperature gradient between high and low latitudes,which contracts the ***,a warmer mid-high latitude in the Northern(Southern)Hemisphere due to surface albedo feedback(weakened AMOC)in our experiments pushes the HC northward(southward).In most seasons,the HC exhibits the same trend as that described above.

关键词： Hadley cell Arctic amplification Southern Hemisphere warming Atlantic Meridional Overturning Circulation

Adsorptions of metal adatoms on graphene-like BC3 and their rich electronic properties： A first-principles study

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Chinese Physics B 2018年第9期27卷 550-557页

作者： Pengfei Sui Jiaqi dai Yinchang Zhao Zhenhong dai Department of Physics Yantai UniversityYantai 264005China Department of Physics. Renmin University of China Beijing 100872 China

Density functional calculations have been performed to investigate the adsorption of twenty two different kinds of metal adatoms on graphene-like BC3. In contrast to the graphene adsorbed with adatoms, the BC3 with adatoms shows many interesting properties.（1） The interaction between the metal adatoms and the BC3 sheet is remarkably strong. The Li, Na, K, and Ca possess the binding energies larger than the cohesive energies of their corresponding bulk metals.（2）The Li, Na, and K adatoms form approximately ideal ionic bonds with BC3, while the Be, Mg, and Ca adatoms form ionic bonds with BC3 with slight hybridization of covalent bonds. The Al, Ga, In, Sn, and all transition metal adatoms form covalent bonds with BC3.（3） For all the structures studied, there exhibit metal, half-metal, semiconducting, and spin-semiconducting behaviors. Especially, the BC3 with Co adatom shows a quantum anomalous Hall（QAH） phase with a Chern number of -1 based on local density approximation calculations.（4） For Li, Na, K, Ca, Ga, In, Sn, Ti, V, Cr,Ni, Pd, and Pt, there exists a trend that the adatom species with lower ionization potential have lower work function. Our results indicate the potential applications of functionalization of BC3 with metal adatoms.

关键词： density functional theory metal adatoms graphene-like BC sheet anomalous Hall conductivity