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Preparation of epoxy resin/rare earth doped aluminate nanocomposite toward photoluminescent and superhydrophobic transparent woods

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Journal of Rare earths 2023年第3期41卷 397-405,I0003页

作者： Mehrez e.el-Naggar Sami Ullah S.Wageh M.A.Abu-Saied Tawfik A.Khattab dalal Alhashmialameer Manal Abou Taleb e.A.Matter Institute of Textile Research and Technology National Research CenterDokkiCairo16221Egypt Research Center for Advanced Materials Science(RCAMS) King Khalid UniversityP.O.Box 9004Abha61413Saudi Arabia department of Chemistry College of ScienceKing Khalid UniversityP.O.Box 9004Abha61413Saudi Arabia department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah21589Saudi Arabia K.A.CARe energy Research and Innovation Center King Abdulaziz UniversityJeddah21589Saudi Arabia Polymeric Materials Research department Advanced Technology and New Materials Research InstituteCity of Scientific Research and Technological Applications(SRTACITY)New Borg El-Arab CityAlexandria21934Saudi Arabia department of Chemistry College of ScienceTaif UniversityTaif21944Saudi Arabia department of Chemistry College of Science and HumanitiesPrince Sattam Bin Abdulaziz UniversityAl-kharj11942Saudi Arabia department of Polymer Chemistry National Center for Radiation Research and Technology(NCRRT)Egyptian Atomic Energy AuthorityNasr CityP.O.Box 7551Cairo11762Egypt department of Chemistry Faculty of ScienceDamanhour University22111 DamanhourEgypt

A translucent wooden substrate with long-lasting phosphorescence,high photostability and durability,tough surface,ultraviolet protection,high optical transmittance,and superhydrophobicity was *** long-lasting phosphorescent wooden substrate is able to continue emitting light for extended time ***-modified wood(LMW)was immobilized with a solution of epoxy resin(eR)and rare-earth doped aluminate(RedA)phosphor nanoparticles(NPs).For an improved dispersion of pigment,RedA was synthesized in a nanoscale particle size,and characterized by transmission electron microscopy(TeM)to indicate a particle size of 8-14 *** crystal structure of RedA nanoparticles was also proved by X-ray diffraction(XRd).For an improved production of long-persistent phosphorescent colo rless woods,RedA must be well-dispersed in MAA without *** and emissio n,as well as decay and lifetime spectra were *** morphologies of the wooden substrates with different ratios of RedA were investigated by scanning electron microscopy(SeM),X-ray fluorescence(XRF)analysis,Fourier transform infrared spectra(FT-IR),elemental mapping,and energy-dispersion Xray(edXA).The phosphorescent woods show changes in color from colorless to green under ultraviolet(UV)irradiation,and to yellowish-green in the dark,as proved by the colorimetric parameters of the CIe Lab *** afterglow wood samples display an absorbance band at 365 nm and two phosphorescent bands at 431 and 520 *** UV shielding,photostability,and hydrophobicity were *** increasing RedA ratio,both static contact and slide angles are found to improve in the ranges of147.6°-163.6°and 9°-14°,*** long-lasting photoluminescence is optimized at a RedA ratio of 8%.The present strategy shows a large-scale production approach of multiple functional woods for many potential applications,such as smart glow in the dark windows and safety signs.

关键词： Translucent wood Rare-earth doped aluminate Superhydrophobic Long-lasting light emission Ultraviolet protection

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Magnetic and XPS studies of lithium lanthanide tetraphosphates LiLnP_4O_(12)(Ln=Nd,Gd,er)

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Journal of Rare earths 2013年第5期31卷 485-489页

作者： d.Petrov B.Angelov V.Lovchinov department of Physical Chemistry Plovdiv University"Paisii Hilendarski" 24 Tsar Asen Str. 4000 Plovdiv Bulgaria department of Inorganic and Physical Chemistry University of Food Technologies-Plovdiv26 Maritsa Blvd. 4002 Plovdiv Bulgaria Institute of Solid State Physics Bulgarian Academy of Sciences72Tsarigradsko Chaussee Blvd.1784 SofiaBulgaria

Magnetic susceptibilities of flux-grown single crystals of LitnP4012 （Ln=Nd, Gd, er） were measured in the temperature range of 2-300 K. The compounds were paramagnetic, and obeyed the Curie-Weiss law in the entire temperature interval, without magnetic phase transitions, and with effective magnetic moments close to those of the corresponding free Ln3＋ ions. X-ray photoelec- tron spectroscopy was applied to determine the positions of core-level electrons relative to the Fermi level： Li is; Ln 4f, 5p, 5s, 4d, 3d; P 2s, 2p; O 1s, 2s. The binding energies in these compounds were found slightly shifted compared to the respective values of the same elements.

关键词： lithium lanthanide tetraphosphates single crystals magnetic properties XPS spectroscopy rare earths

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elderly male with blurry vision

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World Journal of emergency Medicine 2019年第1期10卷 59-60页

作者： Anthony Maselli Sarah e.Frasure department of emergency Medicine Brigham and Women's Hospital

dear editor,We present a case of an elderly gentleman who was punched in the face and subsequently diagnosed by an emergency physician with acute angle closure glaucoma secondary to a posterior lens *** lamp evaluatio... 详细信息

关键词：小学英语课外阅读阅读材料

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Study on the sensitivity to cadmium of marine fish Salaria basilisca(Pisces: Blennidae)

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Journal of environmental Sciences 2009年第11期21卷 1620-1624页

作者： Imed Messaoudi Sana Barhoumi Khaled Sd Abdelhamid Kerken UR 09/30: Genetic and Biodiversity. Institute of Biotechnology Trace elements Free Radicals Antioxidant Systems and Environment and Humain Pathology

The present study tested the sensitivity of Salaria basilisca to water-cadmium （Cd） contamination. For this purpose, liver somatic index （LSI）, Cd concentrations and the activities of antioxidant enzymes such as catalase （CAT）, superoxide dismutase （SOd） and glutathione peroxidase （GSH-Px） were measured in the liver of S. basilisca exposed to Cd-contaminated water （2 mg Cd/L as CdCl2） for 14 and 28 d. The results showed that the LSI decreased significantly after 14 and 28 d of Cd-exposure. Cd bioaccumulation in the liver resulted in an increasing uptake up to 42 μg/g dry weight after 28 d of exposure. Activities of CAT and SOd were significantly increased with increasing exposure time. A significant increase in GSH-Px activity, under Cd influence, was observed during 14-day exposure period （p 〈 0.0001）. However, a significant decrease （p 〈 0.05） in this activity with respect to control fish was registered after 28 d of Cd-exposure. These results showed that Cd accumulation in the liver of S. basilisca could induce oxidative stress as demonstrated by changes in the antioxidant enzyme activities. Results also emphasized that S. basilisca may considered as a sensitive species to Cd exposure.

关键词： cadmium Salaria basilisca oxidative stress antioxidant enzymes

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保护性耕作制中谷物残茬的处理

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国外农学（麦类作物） 1990年第1期 32-35页

作者： d.e.Wilkins 陈建平

与焚烧麦茬相比,保留麦茬可降低种子播处的地温,减少植株中下部的光合有效辐射。保留麦茬播种的小麦主茎叶片生长速度迟缓,其分蘖数减少与分蘖后期地上部干物质重量的减少尤为明显,最终收获时植株也较矮。然而,由于自开花至成熟期间的... 详细信息

与焚烧麦茬相比,保留麦茬可降低种子播处的地温,减少植株中下部的光合有效辐射。保留麦茬播种的小麦主茎叶片生长速度迟缓,其分蘖数减少与分蘖后期地上部干物质重量的减少尤为明显,最终收获时植株也较矮。然而,由于自开花至成熟期间的生长条件十分有利,早期生长发育受保留麦茬播种影响的植株,最终籽粒与秸秆产量损失较小。

关键词：耕作制谷物残茬处理保护性

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等碳量配施玉米秸秆和生物炭对玉米生长及氮、磷、钾吸收的影响

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中国土壤与肥料 2024年第8期 180-187,266页

作者：杨艳杜丹杨雪芳原向阳宋喜娥孙大生山西农业大学农学院山西太谷030801 河北大学生命科学学院河北保定071002

明晰等碳量配施玉米秸秆源有机物料对玉米生长及氮、磷、钾吸收利用的影响,对于合理利用农田有机资源具有重要的指导意义。在黄土高原东部石灰性褐土上开展玉米田间试验,设置单施化肥对照(NPK)、化肥配施玉米秸秆(NPKS)、化肥配施生物炭... 详细信息

明晰等碳量配施玉米秸秆源有机物料对玉米生长及氮、磷、钾吸收利用的影响,对于合理利用农田有机资源具有重要的指导意义。在黄土高原东部石灰性褐土上开展玉米田间试验,设置单施化肥对照(NPK)、化肥配施玉米秸秆(NPKS)、化肥配施生物炭(NPKB)3个处理,有机物料按C 4 t/hm^(2)施用,探讨等碳量配施条件下玉米拔节期农艺性状、光合参数、叶绿素荧光参数以及收获期产量构成和养分吸收特征。结果表明,NPKS处理玉米株高和叶面积较NPK处理分别增加14.8%和29.2%;NPKS和NPKB处理玉米干物质重分别增加80.8%和14.1%。与NPK处理相比,NPKS处理显著提高了玉米叶片的蒸腾速率和气孔导度以及最大光化学效率和实际光化学效率;NPKB处理显著提高了玉米叶片气孔导度以及最大光化学效率和实际光化学效率,但对净光合速率和蒸腾速率无显著影响;NPKS和NPKB处理的玉米叶片胞间CO_(2)浓度和非光化学猝灭系数呈降低趋势。与NPK处理相比,NPKS处理的玉米穗重、百粒重和产量分别增加36.4%、31.1%和45.5%;NPKB处理的玉米穗重和百粒重较NPK处理分别增加18.5%和15.2%。NPKS处理显著提高了玉米秸秆氮、磷、钾吸收量和籽粒氮、钾吸收量,NPKB处理仅显著提高了玉米籽粒氮吸收量和秸秆钾吸收量。综上所述,等碳量配施玉米秸秆源有机物料对玉米生长和养分吸收均具有促进作用;等碳量配施玉米秸秆较生物炭更有利于玉米对磷素吸收,从而促进玉米生长并提高产量。

关键词：玉米秸秆生物炭玉米产量产量构成养分吸收量

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Numerical modelling of high-temperature superconducting dynamos:A review

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Superconductivity 2023年第1期5卷 1-16页

作者： Mark d Ainslie department of engineering King’s College LondonStrandLondon WC2R 2LSUnited Kingdom

The high‐temperature superconducting(HTS)dynamo enables injection of large dC currents into a superconducting coil,without the need for thermally‐inefficient current *** of this important advantage,there is significant interest in using such technology to energise superconducting coils in superconducting rotating machines and NMR/MRI *** the extensive experimental work carried out over the past decade,there was–until very recently–considerable confusion and debate regarding the physical origin of the HTS dynamo’s dC output *** modelling has played a key role in elucidating the underlying physics of such devices and several different numerical models have now been developed as useful and cost‐effective tools to not only explain and further examine experimental results,but also optimise and improve dynamo *** review summarises all of the developments in this important area over recent years,including modelling the open‐circuit voltage behaviour in 2d and 3d,the definition of a new benchmark problem for the HTS modelling community,investigating key dynamo parameters,modelling dynamic coil charging behaviour and calculating losses.A view towards the future is provided,including the outstanding challenges and the developments required to address these.

关键词： HTS modelling HTS dynamo HTS flux pump High temperature superconductors Numerical simulation Finite‐element method

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2型糖尿病肠道菌群与血糖、血脂等生化指标的相关性分析

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智慧健康 2024年第8期10卷 131-133页

作者：黄沁李娥桂元肖婷华中科技大学医院内全科湖北武汉430074

目的探讨2型糖尿病肠道菌群与血糖、血脂等生化指标的相关性分析。方法将2020年1月—2022年12月在本院治疗的100例2型糖尿病患者作为观察组,将同期100例健康体检者作为对照组,对比两组的肠道菌群指标、血糖及血脂指标,分析两者的相关性... 详细信息

目的探讨2型糖尿病肠道菌群与血糖、血脂等生化指标的相关性分析。方法将2020年1月—2022年12月在本院治疗的100例2型糖尿病患者作为观察组,将同期100例健康体检者作为对照组,对比两组的肠道菌群指标、血糖及血脂指标,分析两者的相关性。结果观察组双歧杆菌、乳酸杆菌数目更低,而其他各项菌群数目高于对照组(PdL-C水平更低,其他各项指标均更高(Pearson相关分析显示,血糖、血脂与拟杆菌、肠球菌、肠杆菌、酵母菌呈正相关,与双歧杆菌、乳酸杆菌呈负相关(PdL-C则相反(P<0.05)。结论2型糖尿病肠道菌群与血糖、血脂等生化指标存在明显相关性,两者互相影响,抑制2型糖尿病病情进展。

关键词： 2型糖尿病肠道菌群血糖血脂相关性

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An experimental and theoretical investigation of a small,high aspect-ratio,free-piston,two-stroke engine

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Propulsion and Power Research 2020年第4期9卷 326-343页

作者： Chiluwata e.Lungu Mael disseau daniel C.Stubbs Jechiel Jagoda david e.Scarborough General electric Company GreenvilleSouth Carolina29615USA Georgia Institute of Technology AtlantaGeorgia30332USA Truett McConnel University ClevelandGeorgia30528USA Auburn University AuburnAlabama36849USA

This paper presents a design for a novel,palm sized,high-aspect-ratio *** simplify fabrication and keep the device unobtrusive,a design incorporating a two-cycle engine having a flat,rectangular piston with spring return was *** experimental engine based on this concept producing a significant amount of useful work was *** results were encouraging,this geometry raised many issues to be investigated and resolved,including the effects of piston sealing,scavenging,heat losses,and combustion *** to the complex interplay between these effects,experimental investigation was time consuming and simple models were found to be ***,a more complex theoretical model accounting for these effects was developed and used to evaluate the sensitivity of engine performance to each of these *** predictions of this model were used to develop recommendations for improving the experimentally developed engine.

关键词： Micro-combustion Power generation Free-piston engine Internal combustion engine Palm power

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Mechanical property and structural changes by thermal cycling in phase-separated metallic glasses

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Journal of Materials Science & Technology 2021年第19期78卷 144-154页

作者： Y.Tang H.B.Xiao X.d.Wang Q.P.Cao d.X.Zhang J.Z.Jiang International Center for New-Structured Materials(ICNSM) Laboratory of New-Structured MaterialsState Key Laboratory of Silicon Materialsand School of Materials Science and EngineeringZhejiang UniversityHangzhou310027China State Key Laboratory of Modem Optical Instrumentation Zhejiang UniversityHangzhou.310027China

Nondestructive cryogenically thermal cycling has been a simple but effective treatment to enhance mechanical properties of glassy ***,how the structural heterogeneities on nanometer scales are affected by thermal cycling is still an ***,we report the response of spatial heterogeneities in three selected Ti_(41)Zr_(25)Be_(28)Fe_(6),Zr_(56)Co_(14)Cu_(14)Al_(16)and Zr_(42)Y_(14)Co_(22)Al_(22)(at.%)metallic glasses(MGs)with different compositions to the thermal cycling,which show significantly different structure and properties after the same treatments and could be ascribed to the joint contribution of relaxation and rejuvenation induced by thermal *** rejuvenation is initially prevailed in a Zr-Y-containing MG,whereas the relaxation is dominant in a Cu-Co-containing MG,both eventually entering into a dynamic equilibrium *** employing nanometer-scale structural models,the intrinsic correlation between the spatial heterogeneity and thermal cycling is *** discovery could provide the fundamental understanding of the role of spatial heterogeneity in influencing the macroscopic properties of MGs via thermal cycling and help design high-performance glassy materials by tailoring their atomic structures with suitable thermal treatments.

关键词： Thermal cycling Metallic glass Spatial heterogeneity Relaxation Rejuvenation

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