检索结果-南通市图书馆

ACEL荧光粉粉末ZnS：Cu，X的电荷陷阱的性质与其电致发光频谱之间的联系

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

电子器件 2008年第1期31卷 174-178页

作者： Robert Withnall j.ck Silver Terry G. Ireland paul j. marsh George R. Fern 布鲁纳尔大学豪尔夫逊材料研究处理中心 UxbridgeMiddlesex英国

ZnS：Cu，X（X=Cl，Br，I）ACEL荧光粉的性质主要决定于Cu发光中心的电子发光复合、ZnS点阵中电子的注入效率、诱捕电子和逃逸电子的比率。热致发光中的电子陷阱依赖于掺杂剂以及荧光粉制备方法。文章描述了ACEL荧光粉的退火过程对其电... 详细信息

ZnS：Cu，X（X=Cl，Br，I）ACEL荧光粉的性质主要决定于Cu发光中心的电子发光复合、ZnS点阵中电子的注入效率、诱捕电子和逃逸电子的比率。热致发光中的电子陷阱依赖于掺杂剂以及荧光粉制备方法。文章描述了ACEL荧光粉的退火过程对其电致发光性质的深远影响。从热释光发光曲线上，我们可以看到烧结条件对电子陷阱特征的作用。由于荧光粉的ACEL性质与电子陷阱有关，为了提高荧光粉的性能，对电子陷阱的成因和所起的作用的了解就显得尤为重要。

关键词： ACEL荧光粉电子陷阱热释光

A vectorial model for the nonlinear gradient force exerted on metallic Rayleigh nanoparticles

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2024年第2期22卷 207-213页

作者：朱政张聿全闵长俊 Aurèle j.LAdam H.paul Urbach 袁小聪 Research Center for Humanoid Sensing Research Institute of Intelligent SensingZhejiang LabHangzhou 311100China Nanophotonics Research Center Institute of Microscale Optoelectronics&State Key Laboratory of Radio Frequency Heterogeneous IntegrationShenzhen UniversityShenzhen 518060China Optics Research Group ImPhys DepartmentFaculty of Applied SciencesDelft University of TechnologyDelft 2628 CJThe Netherlands

Optical tweezers have proved to be a powerful tool with a wide range of *** gradient force plays a vital role in the stable optical trapping of *** scalar method is convenient and effective for analyzing the gradient force in traditional optical ***,when the third-order nonlinear effect of the nano-obj.ct is stimulated,the scalar method cannot adequately present the optical response of the metal nanoparticle to the external optical ***,we propose a theoretical model to interpret the nonlinear gradient force using the vector *** combining the optical Kerr effect,the polarizability vector of the metallic nanoparticle is derived.A quantitative analysis is obtained for the gradient force as well as for the optical potential *** vector method yields better agreement with reported experimental *** suggest that this method could lead to a deeper understanding of the physics relevant to nonlinear optical trapping and binding phenomena.

关键词： gradient forces nonlinear effect metallic nanoparticles

Quasi-static and dynamic compressive behaviour of additively manufactured Menger fractal cube structures

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第7期37卷 39-49页

作者： Damith Mohotti Dakshitha Weerasinghe Madhusha Bogahawaththa Hongxu Wang Kasun Wij.sooriya paul j.azell School of Engineering and Technology UNSWCanberraACT2600Australia School of Civil Mining and Environmental EngineeringFaculty of Engineering and Information SciencesUniversity of WollongongWollongongNSWAustralia

This paper presents the first-ever investigation of Menger fractal cubes'quasi-static compression and impact *** cubes with different void ratios were 3D printed using polylactic acid(PLA)with dimensions of 40 mm×40 mm×40 *** different orders of Menger cubes with different void ratios were considered,namely M1 with a void ratio of 0.26,M2 with a void ratio of 0.45,and M3with a void ratio of ***-static Compression tests were conducted using a universal testing machine,while the drop hammer was used to observe the behaviour under impact *** fracture mechanism,energy efficiency and force-time histories were *** the structured nature of the void formation and predictability of the failure modes,the Menger geometry showed some promise compared to other alternatives,such as foams and *** the increasing void ratio,the Menger geometries show force-displacement behaviour similar to hyper-elastic materials such as rubber and *** third-order Menger cubes showed the highest energy absorption efficiency compared to the other two geometries in this *** findings of the present work reveal the possibility of using additively manufactured Menger geometries as an energy-efficient system capable of reducing the transmitting force in applications such as crash barriers.

关键词： Additive manufacturing Fractal geometries Menger cube Energy absorption Quasi-static

Concentration of Copper, Zinc, Lead, Cadmium, and Nickel in the Incinerator Bottom Ash in Five County Hospitals in Kenya

在线全文

学校读者我要写书评

暂无评论

j.urnal of Geoscience and Environment Protection 2024年第6期12卷 90-114页

作者： Muriithi j. Githinj. paul M. Nj.gu Zipporah Nganga Mohamed Karama Institute of Tropical Medicine and Infectious Diseases (ITROMID) Jomo Kenyatta University of Agriculture and Technology (JKUAT) Nairobi Kenya Institute of Energy and Environmental Technology Jomo Kenyatta University of Agriculture and Technology (JKUAT) Nairobi Kenya Academic Research and Student Affairs South Eastern Kenya University Kitui Kenya School of Public Health Amref International University Nairobi Kenya

Healthcare wastes contain potentially harmful microorganisms, inorganic and organic compounds that pose a risk to human health and the environment. Incineration is a common method employed in healthcare waste management to reduce volume, quantity, toxicity as well as elimination of microorganisms. However, some of the substances remain unchanged during incineration and become part of bottom ash, such as heavy metals and persistent organic pollutants. Monitoring of pollution by heavy metals is important since their concentrations in the environment affect public health. The goal of this study was to determine the levels of Copper (Cu), Zinc (Zn) Lead (Pb), Cadmium (Cd) and Nickel (Ni) in the incinerator bottom ash in five selected County hospitals in Kenya. Bottom ash samples were collected over a period of six months. Sample preparation and treatment were done using standard methods. Analysis of the heavy metals were done using atomic absorption spectrophotometer, model AA-6200. One-Way Analysis of Variance (ANOVA) was performed to determine whether there were significant differences on the mean levels of Cu, Zn, Pd, Cd and Ni in incinerator bottom ash from the five sampling locations. A post-hoc Tukey’s Test (HSD) was used to determine if there were significant differences between and within samples. The significant differences were accepted at p ≤ 0.05. To standardize the results, overall mean of each metal from each site was calculated. The metal mean concentration values were compared with existing permissible levels set by the WHO. The concentrations (mg/kg) were in the range of 102.27 - 192.53 for Cu, Zn (131.68 - 2840.85), Pb (41.06 - 303.96), Cd (1.92 - 20.49) whereas Ni was (13.83 - 38.27) with a mean of 150.76 ± 77.88 for Copper, 131.66 ± 1598.95 for Zinc, 234.60 ± 262.76 for Lead, 12.256 ± 10.86 for Cadmium and 29.45 ± 18.24 for Nickel across the five sampling locations. There were significant differences between levels determined by one-way ANOVA of Zn (

关键词： Healthcare Waste Disposal Public Health Environment Incineration Heavy Metals Bottom Ash

Effects of pyrethroid and organophosphate insecticides on reared black soldier fly larvae(Hermetia illucens)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2024年第3期31卷 817-834页

作者： Nathan Meij.r Lisa Zoet Theo de Rij. paul Zomer Deborah Rj.ers H.j.van der Fels-Klerx j.op j.A.van Loon Wageningen Food Safety Research(WFSR) Part of Wageningen University and ResearchWageningenThe Netherlands Bestico B.V. Industrieweg 6Berkel en RodenrjsThe Netherlands Plant Sciences Group Laboratory of EntomologyWageningen UniversityWageningenTheNetherlands

Black soldier fly larvae(Hermetia illucens)receive growing interest as a potential alternative animal feed *** insects may be exposed to insecticide residues in the rearing *** study aimed to investigate the effects of six different pyrethroid and organophosphate insecticides on this insect species'*** toxicity of two"model"substances for each of these classes(cypermethrin;pirimiphosmethyl)was quantified,with and without the synergist piperonyl butoxide(PBO).Critical effect doses corresponding to 10%yield(CED10)for cypermethrin(0.4 mg/kg)and pirimiphos-methyl(4.8 mg/kg)were *** addition of PBO to cypermethrin enhanced its relative potency with a factor *** data were compared against the relative toxicity of two analogue substances in each class(permethrin,deltamethrin;chlorpyrifosmethyl,malathion).Results suggest that exposure to concentrations complying with legal limits can cause significant reductions in *** to multiple substances at lower concentrations resulted in negative additive and synergistic *** the tested substances,deltamethrin was most toxic,causing 94%yield at 0.5 mg/*** results suggested that transfer of tested substances to the larval biomass was substance-and concentration-specific,but appeared to be correlated to reduced yields and the presence of *** of organophosphates was overall low(j.sting legally allowed maximum residue levels in insect feed.

关键词： feed insects pesticides rearing substrate

平版印刷法制作电致发光显示器的微型化电极布线

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

电子器件 2008年第1期31卷 12-16页

作者： j.ck Silver Robert Withnall George R. Fern paul j. marsh Terry G. Ireland paul G. Harris Peter S.A. Evans Darren. j. Southee Gareth I. Hay David. j. Harrison Kesar F. B. Breen 布鲁纳尔大学豪尔夫逊材料研究处理中心 UxbridgeMiddlesex UB8 3PH英国布鲁纳尔大学清洁电子学研究处理中心 UxbridgeMiddlesex UB8 3PH英国

平板印刷柔性的电致发光显示器的交错对插的电极。根据电致发光的荧光粉颗粒尺寸的大小采用的不同的方法将其沉积。小颗粒荧光粉分子可以很容易地与印刷油墨混合。使用这种交错对插电极的柔性显示器不需要透明的导电氧化物作为阳极,容... 详细信息

平板印刷柔性的电致发光显示器的交错对插的电极。根据电致发光的荧光粉颗粒尺寸的大小采用的不同的方法将其沉积。小颗粒荧光粉分子可以很容易地与印刷油墨混合。使用这种交错对插电极的柔性显示器不需要透明的导电氧化物作为阳极,容易实现大规模生产,造价低。这种显示器使用ACEL可以实现多色彩显示。ACEL可以发射出从绿光到使用ZnS:Cu,X(X = Cl , Br ,I)荧光粉的蓝光,或者是到使用ZnS:Cu,Mn荧光粉的橙光。此外,还可以使用颜色转换材料以产生其他颜色的光。

关键词：柔性显示交流电致发光粉平版印刷

Long-term Integration Ability of the Submillimeter Wave Astronomy Satellite(SWAS)Spectral Line Receivers

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2024年第6期24卷 315-322页

作者： Bing-Ru Wang Di Li paul F.Goldsmith j.ngwen Wu Chao-Wei Tsai Rudolf Schieder Gary j.Melnick National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Research Center for Astronomical Computing Zhejiang LaboratoryHangzhou 311100China j.t Propulsion Laboratory California Institute of TechnologyPasadenaCA 91109USA Institute for Frontiers in Astronomy and Astrophysics Beijing Normal UniversityBeijing 102206China KOSMA I.Physik.InstitutUniversität zu KölnZülpicher Str.7750937 KölnGermany Center for Astrophysics|Harvard&Smithsonian 60 Garden StreetMS 66CambridgeMA 02138USA

The Submillimeter Wave Astronomy Satellite(SWAS)was the first space telescope capable of high spectral resolution observations of terahertz spectral *** have investigated the integration ability of its two receivers and spectrometer during five and a half years of on-orbit *** CI,O_(2),H_(2)O,and^(13)CO spectra taken toward all observed Galactic sources were *** present results are based on spectra with a total integration time of up to 2.72×10~4hr(■10~8s).The noise in the spectra is generally consistent with that expected from the radiometer equation,without any sign of approaching a noise *** noise performance reflects the extremely stable performance of the passively cooled front end as well as other relevant components in the SWAS instrument throughout its mission lifetime.

关键词： telescopes space vehicles:instruments instrumentation:miscellaneous ISM:lines and bands

Legal and Ethical Perspectives on Artificial Intelligence

在线全文

学校读者我要写书评

暂无评论

International Relations and Diplomacy 2024年第4期12卷 139-146页

作者： paul j.Morrow Husson University BangorUSA

People are enormously nervous about Artificial *** many are constructive and want to move forward,many want more answers from a business perspective,a legal perspective,and an economic *** today,another class action lawsuit was filed in *** paper will address concerns and hopefully help you understand Artificial Intelligence *** these perspectives,you may decide how you feel and think about Artificial Intelligence based on the information presented in this paper and other research.

关键词： artificial intelligence hallucinations privacy data analytics

A marathon,not a sprint:Increasing population physical activity as a legacy of sports mega-events

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

j.urnal of Sport and Health Science 2024年第6期13卷 732-735页

作者： Fiona C.Bull paul j.Simpson Physical Activity Unit Department of Health PromotionWorld Health OrganizationGeneva CH-1211Switzerland The BMj London WC1H 9JPUK

*** matters The withdrawal of Australia as hosts for the Commonwealth Games in 2026 demonstrates that large international sporting events are more than j.st sporting mastery,medals,and *** also matters.1 The cost of hosting a maj.r international tournament is eye-wateringly *** governments need to show that the billions of dollars of investment deliver a return beyond sporting glory to j.stify the resources that are spent.

关键词： return dollar sport