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Quantum-mechanical effects in photoluminescence from thin crystalline gold films

Light(Science & Applications) 2024年第4期13卷 783-794页

作者： Alan R.bowman Alvaro Rodríguez Echarri Fatemeh Kiani Fadil Iyikanat Ted v.Tsoulos Joel D.Cox Ravishankar Sundararaman F.Javier García de Abajo Giulia Tagliabue Laboratory of Nanoscience for Energy Technologies(LNET) STIÉcole Polytechnique Fédérale de Lausanne(EPFL)LausanneSwitzerland ICFO–Institut de Ciencies Fotoniques The Barcelona Institute of Science and TechnologyCastelldefels(Barcelona)Spain. MbI–Max-born-Institut BerlinGermany. POLIMA–Center for Polariton-driven Light–Matter Interactions University of Southern DenmarkOdense MDenmark. Danish Institute for Advanced Study University of Southern DenmarkOdense MDenmark. Department of Materials Science&Engineering Rensselaer Polytechnic InstituteTroyNYUSA. Department of Physics Applied Physicsand AstronomyRensselaer Polytechnic InstituteTroyNYUSA. ICREA–Institucio Catalana de Recerca i Estudis Avancats BarcelonaSpain

Luminescence constitutes a unique source of insight into hot carrier processes in metals,including those in plasmonic nanostructures used for sensing and energy ***,being weak in nature,metal luminescence remains poorly understood,its microscopic origin strongly debated,and its potential for unraveling nanoscale carrier dynamics largely ***,we reveal quantum-mechanical effects in the luminescence emanating from thin monocrystalline gold ***,we present experimental evidence,supported by first-principles simulations,to demonstrate its photoluminescence origin(i.e.,radiative emission from electron/hole recombination)when exciting in the interband *** model allows us to identify changes to the measured gold luminescence due to quantum-mechanical effects as the gold film thickness is ***,such effects are observable in the luminescence signal from flakes up to 40 nm in thickness,associated with the out-of-plane discreteness of the electronic band structure near the Fermi *** qualitatively reproduce the observations with first-principles modeling,thus establishing a unified description of luminescence in gold monocrystalline flakes and enabling its widespread application as a probe of carrier dynamics and light-matter interactions in this *** study paves the way for future explorations of hot carriers and charge-transfer dynamics in a multitude of material systems.

关键词： luminescence quantum crystalline

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新型耐磨损ONYX切削具制作的PDC钻头

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钻探工程 2024年第3期51卷 111-117页

作者：汤凤林赵荣欣 Нескоромных b.b. 李博周欣段隆臣上海市建筑科学研究院有限公司上海200032 中国地质大学(武汉)工程学院湖北武汉430074 Сибирский Федеративный университет г.КрасноярскРоссия660095 湖北省地震局湖北武汉430064

PDC钻头在石油天然气钻井和地质勘探钻进中得到了广泛的应用,取得了很好的技术经济效果。但是,钻进中产生的PDC切削具非正常磨损,影响了这种先进方法的机械钻速和钻头进尺的提高。俄罗斯史密斯钻头(Smith bits)公司研发了一种钻进过程... 详细信息

PDC钻头在石油天然气钻井和地质勘探钻进中得到了广泛的应用,取得了很好的技术经济效果。但是,钻进中产生的PDC切削具非正常磨损,影响了这种先进方法的机械钻速和钻头进尺的提高。俄罗斯史密斯钻头(Smith bits)公司研发了一种钻进过程中可以沿着自身轴线回转的ONYX切削具,抑制了PDC切削具的非正常磨损,具有创新性和实用价值。НecкopoMныx b.b.教授等对镶有ONYX切削具的钻头的结构和性能参数进行了分析研究。试验表明,这种ONYX切削具的耐磨性比常规固定式PDC切削具的耐磨性好,钻头钻进效果也比较好,俄罗斯正在积极推广使用,建议中国有关专家和部门对此进行研究和试验。

关键词： PDC钻头切削具非正常磨损 ONYX切削具钻头结构性能参数钻进效果

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Observation about the Classical Electromagnetic Gauge Transformation and Its Quantum Correspondence

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Journal of Modern Physics 2024年第4期15卷 474-479页

作者： Gustavo v. López Jorge A. Lizarraga Departamento de Física Universidad de Guadalajara Guadalajara Mexico

Using the Landau and symmetric gauges for the vector potential of a constant magnetic field and the quantum problem of a charged particle moving on a flat surface, we show the classical electromagnetic gauge transformation does not correspond to a one-dimensional unitary group transformation U(1) of the wave function for the quantum case. In addition, with the re-examination of the relation between the magnetic field b and its vector potential A, we found that, in order to have a consistent formulation of the dynamics of the charged particle with both expressions, we must have that b=∇×A if and only if b≠0.

关键词： Gauge Transformation Harmonic Oscillator Quantum Hall Effect Electromagnetic Potentials

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Damage Mechanism of CK2 and IKAROS in Philadelphia Like Acute Lymphoblastic Leukemia

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Journal of biosciences and Medicines 2024年第4期12卷 49-59页

作者： Ignacio vélez-Rodríguez victoria Carranza-Aranda Facultad Mexicana de Medicina Universidad La Salle Tlalpan M&#233xico Hospital General de Mé xico Cuauht&#233moc M&#233xico

Acute lymphoblastic leukemia (ALL) is characterized by immature and poorly differentiated b lymphocytes in large numbers in the blood. b cells are distinct from the cell types involved in their development (common lymphoid progenitor cells, pro-b cells, pre-b cells, and mature cells). The process of b cell maturation depends on precise communication within the cell: signals activate specific genes that are essential for proper development. Errors in this intricate signaling network can lead to issues with b cell function and contribute to disease. b-lineage acute lymphoid leukemias, malignancies of precursor-stage b lymphoid cells inhibit lymphoid differentiation, leading to abnormal cell proliferation and survival. The process of developing leukemia (leukemogenesis) can be triggered by an overproduction of both hematopoietic stem cells (the cells that form all blood cells) and the immature versions of white blood cells called lymphoblasts. Acute lymphoblastic leukemia (ALL) with the presence of the Philadelphia chromosome (ALL Ph) is classified as a high-risk manifestation of the disease, this chromosome is the product of the reciprocal translocation, whose product is a bCR-AbL fusion protein. It is a highly active tyrosine kinase that can transform hematopoietic cells into cytokine-independent. Hyperphosphorylation cascades inhibit the differentiating function of IKZF1 as a tumor suppressor gene which leads to an abnormal proliferation of b cells due to the presence of the Philadelphia chromosome;it inhibits the differentiating process, leukemogenesis involving immature b cells in the bloodstream can result from the uncontrolled growth and division of hematopoietic stem cells and immature lymphoblasts (the precursors to b cells).

关键词： Acute Lymphoblastic Leukemia IKAROS Dephosphorylation Philadelphia Chromosome CK2

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Extracellular vesicles-coupled miRNAs from oviduct and uterus modulate signaling pathways related to lipid metabolism and bovine early embryo development

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Journal of Animal Science and biotechnology 2024年第4期15卷 1528-1549页

作者： Rosane Mazzarella Karina Canon‑beltran Yulia N.Cajas Meriem Hamdi Encina M.Gonzalez Juliano C.da Silveira Claudia L.v.Leal D.Rizos Department of Animal Reproduction INIA-CSICMadridSpain Department of biochemistry and Molecular biology Veterinary FacultyComplutense University of Madrid(UCM)MadridSpain Department Agrarian Production Technical University of MadridUPMMadridSpain Departamento de Ciencias biologicas Universidad Tecnica Particular de LojaUTPLLojaEcuador Department of Anatomy and Embryology FV-UCMMadridSpain Department of veterinary Medicine FZEA-USPPirassunungaBrazil

background Extracellular vesicles(Evs) present in oviductal(OF) and uterine fluid(UF) have been shown to enhance bovine embryo quality during in vitro culture by reducing lipid contents and modulating lipid metabolism-related genes(LMGs), while also influencing cell proliferation, suggesting their involvement on the regulation of different biological pathways. The regulation of signaling pathways related to cell differentiation, proliferation, and metabo-lism is crucial for early embryo development and can determine the success or failure of the pregnancy. bioactive molecules within Evs in maternal reproductive fluids, such as micro RNAs(miRNAs), may contribute to this regulatory process as they modulate gene expression through post-transcriptional *** This study evaluated miRNA cargo in OF-Evs from the early luteal phase and UF-Evs from the mid-luteal phase, coinciding with embryo transit within oviduct and uterus in vivo, and its possible influence on LMGs and sign-aling pathways crucial for early embryo development. A total of 333 miRNAs were detected, with 11 exclusive to OF, 59 to UF, and 263 were common between both groups. From the 20 differentially expressed miRNAs, 19 up-regulated in UF-Evs(bta-miR-134, bta-miR-151-3p, bta-miR-155, bta-miR-188, bta-miR-181b, bta-miR-181d, bta-miR-224, bta-miR-23b-3p, bta-miR-24-3p, bta-miR-27a-3p, bta-miR-29a, bta-miR-324, bta-miR-326, bta-miR-345-3p, bta-miR-410, bta-miR-652, bta-miR-677, bta-miR-873 and bta-miR-708) and one(bta-miR-148b) in OF-Evs. These miRNAs were predicted to modulate several pathways such as Wnt, Hippo, MAPK, and lipid metabolism and degradation. Differ-ences in miRNAs found in OF-Evs from the early luteal phase and UF-Evs from mid-luteal phase may reflect differ-ent environments to meet the changing needs of the embryo. Additionally, miRNAs may be involved, particularly in the uterus, in the regulation of embryo lipid metabolism, immune system, and *** Our study su

关键词： Embryo-maternal interaction Epigenetic Exosomes Mammalian Preimplantation Reproductive fluids

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Geodetic Number and Geo-Chromatic Number of 2-Cartesian Product of Some Graphs

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Open Journal of Discrete Mathematics 2022年第1期12卷 1-16页

作者： Medha Itagi Huilgol b. divya Department of Mathematics Bengaluru City University Central College Campus Bengaluru India Department of Mathematics Bangalore University Bengaluru India

A set S ⊆ v (G) is called a geodetic set if every vertex of G lies on a shortest u-v path for some u, v ∈ S, the minimum cardinality among all geodetic sets is called geodetic number and is denoted by . A set C ⊆ v (G) is called a chromatic set if C contains all vertices of different colors in G, the minimum cardinality among all chromatic sets is called the chromatic number and is denoted by . A geo-chromatic set Sb>cb> ⊆ v (G) is both a geodetic set and a chromatic set. The geo-chromatic number of G is the minimum cardinality among all geo-chromatic sets of G. In this paper, we determine the geodetic number and the geo-chromatic number of 2-cartesian product of some standard graphs like complete graphs, cycles and paths.

关键词： Cartesian Product Grid Graphs Geodetic Set Geodetic Number Chromatic Set Chromatic Number Geo-Chromatic Set Geo-Chromatic Number

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Photonuclear reactions on stable isotopes of selenium at bremsstrahlung end-point energies of 10-23 Mev

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Chinese Physics C 2024年第2期48卷 91-103页

作者： F.A.Rasulova N.v.Aksenov S.I.Alekseev R.A.Aliev S.S.belyshev I.Chuprakov N.Yu.Fursova A.S.Madumarov J.H.Khushvaktov A.A.Kuznetsov b.S.Yuldashev Joint Institute for Nuclear Research DubnaRussia Institute of Nuclear Physics of the Academy of Sciences of the Republic of Uzbekistan TashkentUzbekistan Faculty of Chemistry of Lomonosov Moscow State University MoscowRussia National Research Center"Kurchatov Institute" MoscowRussia Skobeltsyn Institute of Nuclear Physics of Lomonosov Moscow State University MoscowRussia Faculty of Physics of Lomonosov Moscow State University MoscowRussia Institute of Nuclear Physics AlmatyRepublic of Kazakhstan

In this study,experiments were performed at bremsstrahlung end-point energies of 10-23 Mev with the beam from the MT-25 microtron using theγ-activation *** experimental values of relative yields were compared with theoretical results obtained on the basis of TALYS with the standard parameters and the combined model of photonucleon *** isospin splitting in the combined model of photonucleon reactions allows describing experimental data on reactions with proton escape in the energy range from 10 to 23 ***,taking into account isospin splitting is necessary for a correct description of the decay of the giant dipole resonance.

关键词： bremsstrahlung photon cross section isospin splitting giant dipole resonance

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Image Captioning Using Detectors and Swarm based Learning Approach for Word Embedding vectors

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Computer Systems Science & Engineering 2023年第1期44卷 173-189页

作者： b.Lalitha v.Gomathi CSE Department Sethu Institute of TechnologyPulloorKariapatti626115India CSE Department National Engineering CollegeK.R.NagarKovilpatti628503India

IC(Image Captioning)is a crucial part of visual Data Processing and aims at understanding for providing captions that verbalize an image’s important ***,in existing works,because of the complexity in images,neglecting major relation between the object in an image,poor quality image,labelling it remains a big problem for ***,the main objective of this work attempts to overcome these challenges by proposing a novel framework for *** in this research work the main contribution deals with the framework consists of three phases that is image understanding,textual understanding and ***,the image understanding phase is initiated with image pre-pro-cessing to enhance image ***,object has been detected using IYv3MMDs(Improved Yolov3 Multishot Multibox Detectors)in order to relate the interrelation between the image and the object,and then it is followed by MbFOCNNs(Modified bacterial Foraging Optimization in Convolution Neural Networks),which encodes and providesfinal feature ***,the tex-tual understanding phase is performed based on an image which is initiated with preprocessing of text where unwanted words,phrases,punctuations are removed in order to provide a healthy *** is then followed by MGlovEs(Modified Glo-bal vectors for Word Representation),which provides a word embedding of fea-tures with the highest priority towards the object present in an ***,the decoding phase has been performed,which decodes the image whether it may be a normal or complex scene image and provides an accurate text by its learning ability using MDAA(Modified Deliberate Adaptive Attention).The experimental outcome of this work shows better accuracy of shows 96.24%when compared to existing and similar methods while generating captions for images.

关键词： Denoising improved Yolov3 multishot multibox detector

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Hybrid Deep Learning Method for Diagnosis of Cucurbita Leaf Diseases

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Computer Systems Science & Engineering 2023年第3期44卷 2585-2601页

作者： v.Nirmala b.Gomathy M.Kumarasamy College of Engineering KarurTamilnaduIndia K.P.R.Institute of Technology CoimbatoreTamilnaduIndia

In agricultural engineering,the main challenge is on methodologies used for disease *** manual methods depend on the experience of the *** to large variation in environmental condition,disease diagnosis and classification becomes a challenging *** from the disease,the leaves are affected by climate changes which is hard for the image processing method to discriminate the disease from the other *** Cucurbita gourd family,the disease severity examination of leaf samples through computer vision,and deep learning methodologies have gained popularity in recent *** this paper,a hybrid method based on Convolutional Neural Network(CNN)is proposed for automatic pumpkin leaf image *** Proposed Denoising and deep Convolutional Neural Network(CNN)method enhances the Pumpkin Leaf Pre-processing and *** time data base was used for training and testing of the proposed *** on existing pre-trained network Alexnet and googlenet was investigated is done to evaluate the performance of the pro-posed *** system and computer simulations were performed using Matlab tool.

关键词： Cucurbita farming disease diagnosis classification Convolutional Neural Network(CNN) preprocessing deep learning

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Case Studies on Time-Dependent Ginzburg-Landau Simulations for Superconducting Applications

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Electromagnetic Science 2024年第2期2卷 1-20页

作者： Cun Xue Qing-Yu Wang Han-Xi Ren An He Alejandro v.Silhanek School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an 710072China School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China College of Science Chang’an UniversityXi’an 710064China Department of Physics Universitéde LiègeB-4000 Sart TilmanBelgium

The macroscopic electromagnetic properties of type-II superconductors are mainly influenced by the behavior of micro-scopic superconducting flux quantum ***-dependent Ginzburg-Landau(TDGL)theory is a well-known tool for describing and examining both the statics and dynamics of these superconducting *** have been instrumental in replicating and elucidat-ing numerous experimental results over the past *** paper provides a comprehensive overview of the progress in TDGL simulations,focusing on three key aspects of superconductor *** delve first into vortex rectification in supercon-ductors described within the TDGL framework,specifically highlighting the achievement of superconducting diode effect through asymmetric pinning landscapes and the reversible manipulation of vortex ratchets with dynamic pinning *** terms of the achievements of TDGL simulations concerning the critical current density of superconductors,we emphasize particularly on the optimization of pinning sites,including vortex pinning and dynamics in polycrystalline Nb3Sn with grain *** the third aspect,we concentrate on numerical modeling of vortex penetration and dynamics in superconducting radio-frequency cavities,including a discussion on superconductor-insulator-superconductor multilayer ***,we present key findings,insights,and perspectives derived from the discussed simulations.

关键词： Time-dependent Ginzburg-Landau vortex rectification Critical current density Superconducting radio-frequen-cy cavities

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