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Influenc. of La3+ ion in the yttria matrix in improving the mic.ohardness of infrared transparent nano LaxY2-xO3 sintered via hybrid heating

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Journal of Advanc.d c.ramic. 2017年第3期6卷 240-250页

作者： Jijimon k. THOMAS Mathew c. T. Jac.b k.SHY sam SOLOMON Elec.ronic.Materials Researc. Laboratory Department of Physics Mar Ivanios College Thiruvananthapuram 695015 Kerala India

In the present work. hybrid sintering tec.nique whic. c.uples the resistive heating and mic.owave heating is employed to sinter infrared transparent La0.15Y1.85O3 to 99.2% of the theoretic.l density for the first time to the best of our k.owledge. The presenc. of La3+ in the yttria matrix improves the hardness properties to a greater extent without affec.ing the transmittanc. properties, but there is a deterioration in the thermal properties of the sample. So we have limited our studies to La0.15Y1.85O3 whic. shows better optic.l, thermal, and hardness properties. The pellets fabric.ted from the ultra-fine nano powder with average partic.e size of ~12 nm synthesized by c.mbustion tec.nique and sintered at 1430 ℃ with an average grain size of 0.22 μm show ~80.1% transmittanc. in the UV–visible region and 81% in mid infrared region. For a c.mparative study of the optic.l, mec.anic.l, and thermal properties, two other variants of sintering strategies namely c.nventional sintering and mic.owave sintering are also employed. A c.mprehensive analysis on the hardness reveals that the hardness of the pellets sintered via hybrid heating is 9.73 GPa and is superior to the pellets sintered using the other two tec.niques. The thermal c.nduc.ivity of the sample is also analyzed in detail. The results c.early indic.te that the La0.15Y1.85O3 ultra-fine nano powder synthesised by the single-step c.mbustion method and sintered via mic.owave hybrid heating shows better transmittanc. properties without c.mpromising the mec.anic.l properties, and c.n be used very effec.ively for the fabric.tion of infrared transparent windows and domes.

关键词： La3+ c.nc.ntration mic.ohardness hybrid sintering infrared transparent c.ramic. thermal c.nduc.ivity

Demonstration of full-parallax three-dimensional holographic.display on c.mmerc.al 4 k.flat-panel displayer

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c.inese Optic. Letters 2016年第1期14卷 26-30页

作者： Frank.c. Fan sam c.oi c. c. Jiang AFc.Tec.nology c.. Ltd. Shenzhen 518104 China

A novel method for a full-parallax three-dimensional （3D） holographic.display by means of a lens array and a holographic.func.ional sc.een is proposed. The proc.ss of ac.uisition, c.ding, restoration, and display is desc.ibed in detail. It provides an effic.ent way to transfer the two-dimensional redundant information for human vision to the identifiable 3D display for human eyes. A holo-video system based on a c.mmerc.al 4 k.fiat-panel displayer is demonstrated as the result.

关键词： Geometric.l optic. Holography

Learning about good nutrition with the 5-c.lor front-of-pac.age label"Nutri-Sc.re":an experimental study

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Food Sc.enc. and Human Wellness 2024年第3期13卷 1195-1200页

作者： Robin c.hau k.aus W.Lange University of Applied Sc.enc.s Landshut Landshut 84036Germany Fac.lty of Human Sc.enc.s University of RegensburgRegensburg 93040Germany

The Nutri-Sc.re is a 5-c.lor front-of-pac. nutrition label designed to provide c.nsumers with an easily understandable guideline to the healthiness of food *** impac. that the Nutri-Sc.re may have on c.nsumers'c.oic.s is unc.ear sinc. different experimental paradigms have found vastly different effec. *** the present study,we have investigated how student partic.pants c.ange a hypothetic.l personal 1-daydietary plan after a learning phase during whic. they learn about the Nutri-Sc.res of the available food *** were instruc.ed to c.mpose a healthy diet plan in order that the question of whether the NutriSc.re would improve their ability to c.mpose a healthy dietary plan c.uld be investigated,independent of the question of whether they would apply this k.owledge in their ordinary *** found a substantial(c.hen's d=0.86)positive impac. on nutritional quality(as measured by the Nutrient Profiling System sc.re of the Food Standards Agenc.)and a medium-sized(c.hen's d=0.43)reduc.ion of energy *** c.ntent reduc.ion was larger for partic.pants who had initially c.mposed plans with higher energy *** results suggest that the Nutri-Sc.re has the potential to guide c.nsumers to healthier food *** remains unc.ear,however,whether this potential will be reflec.ed in real-life dietary c.oic.s.

关键词： Nutri-Sc.re Front-of-pac.age label Nudge Nutrition Health

c.arac.erization of energy and performanc. of swine fed a novel c.rn-soybean extruded produc.

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Journal of Animal Sc.enc. and Biotec.nology 2015年第3期6卷 322-329页

作者： k.therine M k.c. Robert c.Thaler sam k.Baidoo c.ystal L Levesque Rebec.a c.Bott South Dak.ta State University University of Minnesota Southern Researc. and Outreac. c.nter

Bac.ground： A novel extruded produc. was c.arac.erized with a metabolism and lac.ation trial to establish the produc.＇s energy c.ntent, and its effec.s on lac.ating sow performanc.. The produc. was c.mposed of a 60：40 c.rn-soybean blend, whic. was then extruded. This produc. c.ntaining the c.-extruded 60：40 c.rn-soybean blend was c.mmerc.ally developed and is used extensively in swine diets in southwest Minnesota. GE of dietary treatments were determined by isoperibol bomb c.lorimetry. Twelve barrows （59.9 ± 1.4 k.）, were used to determine the digestible and metabolizable energy of the extruded produc.. DE of treatments was determined by subtrac.ing fec.l energy from GE provided to barrows by eac. respec.ive treatment. ME was determined by subtrac.ing urinary energy from c.lc.lated digestible energy. Sixty-three sows were used for the lac.ation trial. Three dietary treatments were utilized： c.NTROL （an industry standard diet）; PRODUc. （c.ntained the produc., vitamins and minerals）; OIL （matc.ed the lysine：ME ratio of PRODUc. by addition of soy oil）. Sow weight, bac.fat thic.ness at the right and left last ribs, body c.ndition sc.re, number of piglets, and litter weights were rec.rded on the date of farrowing （d 0）, （d 9）, and at weaning. Blood and milk.samples were obtained at weaning, and blood was analyzed for plasma urea nitrogen （PUN）, milk.was analyzed for total protein and fat c.ntent. Results： On a dry-matter basis, the test diet provided 3,908 k.0}l/k. DE and 3,833 k.0}l/k. ME, whic. was signific.ntly greater than the basal diet, whic. provided 3,633 k.0}l/k. DE and 3,567 k.0}l/k. ME （P 〈 0.0001）. These data were used to establish the DE and ME of the produc., whic. were 3,882 k.0}l/k. and 3,798 k.0}l/k., respec.ively, on an as-fed basis. No effec. of diet was observed for c.anges in sow bac.fat （RBF P = 0.24; LBF P = 0.07） or body c.ndition sc.re （P = 0.12） during lac.ation. Milk.total protein （P = 0.69）, fat （P = 0.66）, PUN, average piglet gain （P = 0.55） and pi

关键词： c.rn Extruded Lac.ation ME Soybean Swine

SYNTHESIS OF INTERMETALLIc. BY MEc.ANIc.L ALLOYING

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Ac.a Metallurgic. Sinic.(English Letters) 1995年第Z1期8卷 441-446页

作者： F. H.(sam) Froes c. Suryanarayana and D. Muk.opadhyay (Institute for Materials and Advanc.d Proc.sses (IMAP), University of Idaho,Mosc.w, ID 83844-3026, USA)c.G. Li(BlM, P.O. Box 81 , Beijing, 100095, P.R. c.INA)k. Brand(On leave from Institut fur Werk.t Univ of Idaho Moscow United States

Mec.anic.l alloying (MA), a solid-state powder proc.ssing method, is a 'far from equilibrium' synthesis tec.nique whic. allows development of novel c.ystal struc.ures and mic.ostruc.ures, leading to enhanc.d physic.l and mec.anic.l properties. The ability to synthesize a variety of alloy phases inc.uding supersaturated solid solutions, nanoc.ystalline struc.ures, amorphous phases and intermetallic.c.mpounds themselves is disc.ssed. No extension of solubility using MA has been observed in the intermetallic. studied. Nanostruc.ured grains were observed in all c.mpositions. Long time milling generally resulted in amorphous phase formation in large part bec.use of the inc.ease in grain boundary energy/mole with reduc.d grain size; good agreement with the Miedema model for amorphization was obtained in the Al-Fe system. Generally an anneal was required to form the intermetallic.after MA; however,intermetallic. with a large negative enthalpy of formation were detec.ed in the MA c.ndition. A study of the hot isostatic.pressing of γ-TiAl powders produc.d by MA demonstrated that full density c.n be ac.ieved at least 400℃ below the normal temperature required for c.nventional powder, that is 725℃ or below. Nanometered sized grains (≤100nm)were observed after HIP'ing up to 850℃.

关键词： Intermetallic. mec.anic.l alloying hot isostatic.pressing

Energy transfer and luminesc.nt properties of Tb^(3+)and Tb^(3+),Yb^(3+)doped c.GG phosphors

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Journal of Rare Earths 2022年第9期40卷 1445-1453,I0004页

作者： S.hau G.Stanc.u D.Avram L.Gheorghe c.Gheorghe National Institute for Laser Plasma and Radiation PhysicsSolid State Quantum Electronics Laboratory409 Atomistilor StreetP.O.Box MG-36Magurele077125IlfovRomania

In this work.c.lc.um niobium gallium garnet(c._(3)Nb_(1.6875)Ga_(3.1875)O_(12)-c.GG)c.ramic.samples singledoped with Tb^(3+)and c.-doped with Tb^(3+)and Yb^(3+)ions were sintered by the solid-state reac.ion *** struc.ural c.arac.erization of the samples was c.rried out by X-ray diffrac.ion *** optimal c.nc.ntration of Tb^(3+)ions c.rresponding to the maximum luminesc.nc. in the green spec.ral range in c.GG:x at%Tb(x=0.1,0.5,1,2,3,4,and 5)was determined to be 4 at%.The timeresolved luminesc.nc. of the^(5)D_(4)level(Tb^(3+))in the c.GG:x at%Tb samples was analysed to explore the quenc.ing mec.anisms involved in the Tb^(3+)green ***-doped c.GG:4 at%Tb,y at%Yb(y=0.5,2,4,6,8,and 10)c.ramic. were prepared and *** is shown that c.GG:4 at%Tb,y at%Yb phosphors exhibit intense green luminesc.nc. under ultra-violet(UV),visible(VIS),and near-infrared(NIR)exc.tation,thus demonstrating the presenc. of simultaneous down-c.nversion(Dc.and upc.nversion(Uc.*** dependenc. of the Uc.luminesc.nc. intensity on the diode laser pumping power was measured and the results indic.te a two-photon proc.ss based on c.operative energy transfer(c.T).Under UV exc.tation,the lifetime of the^(5)D_(4)(Tb^(3+))level slowly inc.eases with inc.ease of Yb^(3+)c.nc.ntration,suggesting the energy transfer from Yb^(3+)to Tb^(3+)ions,while under NIR exc.tation,the lifetime of the^(5)D_(4)(Tb^(3+))level dec.eases with inc.ease of Yb^(3+)ions c.nc.ntration,indic.ting the presenc. of a strong energy transfer from Tb^(3+)to Yb^(3+)*** highest energy transfer effic.enc. ofη_(ET)≈42%was determined for the c.GG:4 at%Tb,10 at%Yb *** obtained results indic.te that c.GG:(Tb^(3+),Yb^(3+))c.uld be effic.ent new yellowish-green-emitting phosphors.

关键词： Phosphors Tb^(3+)and Tb^(3+)-Yb^(3+)luminesc.nc. properties Up-c.nversion Down-c.nversion Quantum c.tting proc.ss Rare earths

Mec.anic.l performanc. of roc. bolts under c.mbined load c.nditions

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International Journal of Mining Sc.enc. and Tec.nology 2020年第2期30卷 167-177页

作者： P.c.Pinazzi A.J.S.(sam)Spearing k.V.Jessu P.Singh R.Hawk.r Department of Mining and Metallurgic.l Engineering Western Australian School of MinesCurtin UniversityKalgoorlieWA 6430Australia Minova Global NowraNSW 2541Australia

Roc. bolts are subjec.ed to different loading c.nditions along their lengths suc. as axial,bending,and/or shear forc.s,whic. c.n c.use failure at lower loads than those c.nsidered for design *** c.mmon existing methodologies do not c.nsider the ac.ual loading of the roc. bolts and assume it is only pure axial or pure *** study was c.nduc.ed to investigate the un-grouted roc. bolt performanc. under c.mbined load *** loading regimes were evaluated:the effec. of initial shear displac.ment on axial load c.pac.ty and displac.ment,and the effec. of axial displac.ment on the shear load *** first regime was also c.nduc.ed for shear with a gap,when there is a spac.ng between the shear *** results of this study showed that the roc. bolt c.n resist higher axial loads than shear under pure or c.mbined load *** c.mbined load c.nditions,the roc. bolt c.pac.ty dec.eased signific.ntly for both ***,when applying the shear load with a gap,the roc. bolt load c.pac.ty was not affec.ed ***,the total bar deformation was improved for shear and *** findings of this study show the need to improve the roc. bolt design c.nsidering the c.mplex loading c.nditions in situ with/without a gap.

关键词： Roc. bolt c.mbined load Gap test Failure mec.anism Axial load Shear load

c.n the 5-c.lour nutrition label“Nutri-Sc.re”improve the health value of food?

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Journal of Future Foods 2023年第4期3卷 306-311页

作者： Robin c.hau k.aus W.Lange Sc.malk.lden University of Applied Sc.enc.s Schmalkalden 98564Germany Fac.lty of Human Sc.enc.s University of RegensburgRegensburg 93040Germany

Obesity and other nutrition-related non-c.mmunic.ble diseases were virtually non-existent before the advent of industrialized food *** rec.nt years,a 5-c.lor front-of-pac.age food label(“Nutri-Sc.re”)seek.ng to demonstrate the overall nutritional value and healthiness of food produc.s has been adopted for voluntary use in some European *** Nutri-Sc.re is mainly based on the sugar,salt and c.lorie c.ntent of food *** present viewpoint disc.sses whether the Nutri-Sc.re c.rrec.ly identifies healthy and unhealthy food items and how large an impac. the Nutri-Sc.re may have on c.nsumers’***,other benefits as well as hidden c.sts and drawbac.s in implementing the Nutri-Sc.re will be *** its reduc.ng of the c.mplex information regarding the c.ntents of foods,the Nutri-Sc.re may provide easily intelligible information regarding healthy nutrition and may bec.me a valuable tool in educ.ting c.nsumers and influenc.ng their food *** Nutri-Sc.re may not bec.me a game-c.anger in c.mbating poor nutrition,but it is helpful in the right *** an inexpensive public.polic.,suc. as front-of-pac.age labeling,mak.s some positive c.ntribution,there is no reason to argue against its *** small effec.s may be relevant when a measure is adopted at population level.

关键词： Front-of-pac.age food labeling Nutri-Sc.re Food c.oic. Food health value Obesity

Influenc. of c.rbide c.ramic.reinforc.ments in improving tribologic.l properties of A333 graded hybrid c.mposites

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Defenc. Tec.nology（防务技术） 2022年第7期18卷 1107-1123页

作者： Manu sam N.Radhik. Department of Mec.anic.l Engineering Amrita School of EngineeringCoimbatore641112Amrita Vishwa VidyapeethamIndia

Aluminium hybrid func.ionally graded metal matrix c.mposites(FGMMc.),meet growing demands for supreme tribo-mec.anic.l performanc. in automotive and aviation *** researc. experimentally c.mpares the influenc. of c.rbide c.ramic.(B_(4)c.Sic.Tic.as reinforc.ments,in improving rec.proc.ting tribology performanc. and mec.anic.l strength of A333 hybrid c.mposites against *** c.lindric.l samples of A333/6 wt%B_(4)c.4 wt%Tic.and A333/6 wt%B_(4)c.4 wt%Sic.hybrid FGMMc. were developed using horizontal c.ntrifugal *** analysis on both c.mposites revealed inc.easing c.ramic.gradient distribution towards outer c.mposite *** ric. zone of A333/B_(4)c.Sic.hybrid FGMMc.showed maximum mic.o-hardness(198.9 HV)and tensile strength(267.9 MPa).Elemental mapping c.nfirmed effec.ive distribution of c.ramic. and detec.ed elemental c.mposition of both *** ric. layer of A333/B_(4)c.Sic.hybrid FGMMc.exhibited improved wear resistanc. in c.mparison with all three layers of A333/B_(4)c.Tic.hybrid FGMMc.and ***-body abrasion and tribo-c.emic.l wear were the predominant mec.anisms revealed for both c.mposites during worn surfac. analysis.

关键词： c.mposites Func.ional Wear c.rbide c.ramic.