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High-performance warm white LED based on thermally stable all inorganic perovskite quantum dots

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Opto-Electronic Advances 2023年第3期6卷 84-87页

作者： jr-Hau He Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China

All inorganic CsPbBr_(3) quantum dots(QDs)are regarded as excellent candidates for next-generation emitters due to their high photoluminescence quantum yield(PLQY)and defect ***,the poor stability and degraded luminescent performance may impede their further commercialization because of the separation of conventional ligands from the QDs ***,Zang replaced the regular oleic acid with 2-hexyl-decanoic acid(DA),which possesses higher binding energy on the QDs surfaces,to act as ligands of QDs,exhibiting PLQY of 96%and excellent stabilities against ethanol and *** with DA-modified CsPbBr_(3) QDs achieved improved thermal stability,a color rendering index of 93,a power efficiency of 64.8 lm/W and a properly correlated color temperature value of 3018 K,implying their prominent applications in solid-state lighting and displays.

关键词： inorganic quantum performance

Study of Solidification Shrinkage of Ductile Iron in Dry Sand Molds

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Journal of Materials Science & Technology 1999年第3期15卷 245-250页

作者： Li, jr Liu, BC Beijing Inst Aeronaut mat Beijing 100095 Peoples R China Tsing Hua Univ Dept Engn Mech Beijing 100084 Peoples R China

The effects of metallurgical and processing parameters on the formation of solidification shrinkage in ductile iron have been studied, considering the parameters of carbon equivalent, inoculation, casting modulus and pouring temperature within specific ranges of these variables. Based on the orthogonal experiments, the metallurgical and processing parameters of the minimum casting shrinkage and the maximum casting shrinkage were obtained, and the effects of metallurgical and processing parameters on the formation of shrinkage cavities and porosities in ductile iron castings were discussed. A regression equation relating these variables to the formation of shrinkage was derived based upon the orthogonal experiments conducted.

关键词： Nodular iron

Extracting classification rules based on a cumulative probability distribution approach

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Journal of Zhejiang University-Science C(Computers and Electronics) 2011年第5期12卷 379-386页

作者： jr-shian CHEN Department of Computer Science and Information Management Hungkuang University

This paper deals with a reinforced cumulative probability distribution approach (CPDA) based method for extracting classification *** method includes two phases:(1) automatic generation of the membership function,and (2) use of the corresponding linguistic data to extract classification *** proposed method can determine suitable interval boundaries for any given dataset based on its own characteristics,and generate the fuzzy membership functions *** results show that the proposed method surpasses traditional methods in accuracy.

关键词： Cumulative probability distribution approach (CPDA) Classification rule C4.5

Analytical Study of Moving Excitations for One-dimensional Homogeneous Lattice with Quartic Anharmonicity

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Journal of Materials Science & Technology 1999年第4期15卷 345-347页

作者： Zhou, GH Yan, jr Hunan Normal Univ Dept Phys Changsha 410081 Peoples R China Hunan Normal Univ Inst Nonlinear Sci Changsha 410081 Peoples R China Chinese Acad Sci Int Ctr Mat Phys Shenyang 110015 Peoples R China

The moving nonlinear excitations (intrinsic localized vibrational modes) for one-dimensional homogeneous monoatomic lattice with quartic anharmonicity are obtained analytically by means of the semidiscrete approximation, with which the carrier wave is treated explicitly while the envelope function is described in the continuum approximation. Besides the moving pulse-like type of excitations which was found previously in both analytical and numerical works, we find that the moving kink-like type of excitations can also exist. And the kink-like excitations appeared previously only in the stationary form for such a lattice system.

关键词： Crystalline materials

Development of a 3D model for particle-wall collision and induced rotation and its influence on particle trajectories

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Particuology 2024年第11期94卷 211-228页

作者： Cairen Miranda John Palmore jr. Department of Mechanical Engineering Virginia TechBlacksburg24060VAUSA Department of Mechanical Engineering University of WashingtonSeattle98195WAUSA

The present research focuses on improving the prediction of rotating particle *** particle-surface collision models do not accurately predict the particle rebound when taking rotation into *** data,such as the studies by Gorham and Kharaz(2000),Buck,Tang,Heinrich,Deen and Kuipers(2017),and Dong and Moys(2006)show that the Tsuji,Oshima and Morikawa(1985)model is inaccurate due to the incorrect tangential coefficient of restitution ***,Kuipers,Mohd Salleh,Stein,and Seville(2001)introduced a similar model to the work by Tsuji et al.(1985)which includes a tangential coefficient of restitution but is only in two dimensions and does not consider out of plane *** work re-derives the particle collision model from the impulse equations for binary collisions in 3D while considering rotating *** derived equations in this work compares well to experimental particle-surface impact *** implications of this model are seen by investigating erosion due to particle collision in a simple pipe *** is shown that Tsuji et al.(1985)over predicts the *** small differences in particle trajectories between the present model and the Tsuji et al.(1985)model will grow in complex flows with multiple close range particle impacts leading to inaccurate erosion predictions which will negatively impact the design of turbomachinery and pneumatic pipes.

关键词： Particle collisions CFD Rotation Three dimensional

Autophagy and ethanol-induced liver injury

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World Journal of Gastroenterology 2009年第10期15卷 1178-1185页

作者： Terrence M Donohue jr Liver Study Unit The Omaha Veterans Affairs Medical Center Department of Internal Medicine University of Nebraska Medical Center Omaha Nebraska 68105 United States

The majority of ethanol metabolism occurs in the liver. Consequently, this organ sustains the greatest damage from ethanol abuse. Ethanol consumption disturbs the delicate balance of protein homeostasis in the liver, causing intracellular protein accumulation due to a disruption of hepatic protein catabolism. Evidence indicates that ethanol or its metabolism impairs trafficking events in the liver, including the process of macroautophagy, which is the engulfment and degradation of cytoplasmic constituents by the lysosomal system. Autophagy is an essential, ongoing cellular process that is highly regulated by nutrients, endocrine factors and signaling pathways. A great number of the genes and gene products that govern the autophagic response have been characterized and the major metabolic and signaling pathways that activate or suppress autophagy have been identified. This review describes the process of autophagy, its regulation and the possible mechanisms by which ethanol disrupts the process of autophagic degradation. The implications of autophagic suppression are discussed in relation to the pathogenesis of alcohol-induced liver injury.

关键词： Autophagy Autophagosome Ethanolmetabolism Hepatomegaly Lysosomes Signal transduction

Is Brenner＇s Modification to the Classical Navier-Stokes Equations Able to Describe Sound Propagation in Gases？

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Chinese Physics Letters 2008年第4期25卷 1355-1358页

作者： W. Marques jr. Departamento de Fisica Universidade Federal do Parana Calxa Postal 19044 81531-990 Curitiba Brazil

We analyse the problem concerning the propagation of sound waves in gases by using the modified hydrodynamic theory proposed recently by Brenner for single-component fluids. The modifications introduced by Brenner are based on his proposal that the translational momentum in fluid motion is not given by the mass flux. Comparison of the sound propagation results derived from Brenner＇s theory with available experimental data for monatomic gases shows that this modified continuum theory is unable to describe the acoustic measurements not even in the low-frequency limit, a result that from our point of view makes Brenner＇s proposal questionable.

关键词： Modification Classical Navier-Stokes Equations Able

Fabrication and characterization of Cu–Zn–Sn shape memory alloys via an electrodeposition–annealing route

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International Journal of Minerals,Metallurgy and Materials 2019年第11期26卷 1436-1449页

作者： Richard Espiritu Alberto Amorsolo jr. Department of Mining Metallurgical and Materials Engineering University of the Philippines Diliman

Cu–Zn–Sn shape memory alloys(SMAs)with an average composition of 56.0 at%,36.1 at%,and 7.9 at%for Cu,Zn,and Sn,respectively,were successfully fabricated via an electrodeposition–annealing *** produced SMAs were assessed for shape memory response in terms of percent displacement(martensite phase recovery)by subjecting the ternary alloys to flame tests and subsequently characterizing them via differential scanning calorimetry(DSC),optical microscopy,scanning electron microscopy in conjunction with energy-dispersive spectroscopy(SEM-EDS),and X-ray diffraction(XRD)*** flame tests showed that the highest displacement was ca.93%,with average austenite and martensitic start transformation temperature of 225°C and 222°C,*** analysis revealed that the intermetallic phases responsible for the observed shape memory properties have substitutional Zn in the lattice occupied by Cu and Sn,leading to the formation of Cu(Zn,Sn)and Cu6(Zn,Sn)5 *** formation of these variants was attributed to the faster interdiffusion of Cu into Sn,driven by an activation energy of 34.82 kJ·mol^-*** cycles of repeated torching–annealing revealed an essentially constant shape memory response,suggesting that the fabricated SMAs were consistent and sufficiently reliable for their intended service application.

关键词： electrodeposition annealing intermetallics martensitic transformation shape memory alloy

Alcohol-induced steatosis in liver cells

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World Journal of Gastroenterology 2007年第37期13卷 4974-4978页

作者： Terrence M Donohue jr Liver Study Unit The Omaha Veterans Affairs Medical Center the Department of Internal Medicine University of Nebraska Medical Center Omaha Nebraska 68105 United States

Alcohol-induced fatty liver (steatosis) was believed to result from excessive generation of reducing equivalents from ethanol metabolism, thereby enhancing fat accumulation. Recent findings have revealed a more complex picture in which ethanol oxidation is still required, but specific transcription as well as humoral factors also have important roles. Transcription factors involved include the sterol regulatory element binding protein 1 (SREBP-1) which is activated to induce genes that regulate lipid biosynthesis. Conversely, ethanol consumption causes a general down-regulation of lipid (fatty acid) oxidation, a reflection of inactivation of the peroxisome proliferator- activated receptor-alpha (PPAR-α) that regulates genes involved in fatty acid oxidation. A third transcription factor is the early growth response-1 (Egr-1), which is strongly induced prior to the onset of steatosis. The activities of all these factors are governed by that of the principal regulatory enzyme, AMP kinase. Important humoral factors, including adiponectin, and tumor necrosis factor-α (TNF-α), also regulate alcohol-induced steatosis. Their levels are affected by alcohol consumption and by each other. This review will summarize the actions of these proteins in ethanol-elicited fatty liver. Because steatosis is now regarded as a significant risk factor for advanced liver pathology, an understanding of the molecular mechanisms in its etiology is essential for development of effective therapies.

关键词： Ethanol metabolism Fatty liver Sterolregulatory element binding protein Peroxisomeproliferator activated receptor Early growth response-i Fatty acid toxicity Triglycerides Acetaldehyde Reactiveoxygen species