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spatio-temporal coupled mode theory for nonlocal metasurfaces

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Light(science & Applications) 2024年第2期13卷 267-282页

作者： adam Overvig sander A.Mann Andrea Alù Photonics Initiative Advanced Science Research CenterCity University of New YorkNew YorkNY10031USA Physics Program Graduate Center of the City University of New YorkNew YorkNY10016USA

Diffractive nonlocal metasurfaces have recently opened a broad range of exciting developments in nanophotonics research and applications,leveraging spatially extended—yet locally patterned—resonant modes to control light with new degrees of *** conventional grating responses are elegantly captured by temporal coupled mode theory,current approaches are not well equipped to capture the arbitrary spatial response observed in the nascent field of nonlocal ***,we introduce spatio-temporal coupled mode theory(sTCMT),capable of elegantly capturing the key features of the resonant response of wavefront-shaping nonlocal *** framework can quantitatively guide nonlocal metasurface design while maintaining compatibility with local metasurface frameworks,making it a powerful tool to rationally design and optimize a broad class of ultrathin optical *** validate this sTCMT framework against full-wave simulations of various nonlocal metasurfaces,demonstrating that this tool offers a powerful semi-analytical framework to understand and model the physics and functionality of these devices,without the need for computationally intense full-wave *** also discuss how this model may shed physical insights into nonlocal phenomena in photonics and the functionality of the resulting *** a relevant example,we showcase sTCMT’s flexibility by applying it to study and rapidly prototype nonlocal metasurfaces that spatially shape thermal emission.

关键词： theory resonant spatially

FEA-based Geometrical Modification of switched reluctance Motor for radial Force reduction

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Chinese Journal of Electrical Engineering 2024年第1期10卷 124-135页

作者： rani s Jayapragash r school of Electrical Engineering Vellore Institute of TechnologyChennai 600127India

switched reluctance motors(srMs)are becoming increasingly popular in the automotive sector owing to their robust ***,srMs are preferred particularly for EV applications owing to their fault tolerance,magnet-free structure,and high power/torque *** main concerns of srM compared to other machines include torque ripple and *** primary cause of vibration is the radial force created by the srM.A geometry-based modification of the srM to reduce the radial force without significantly changing the average torque produced is *** primary goal is to design a 4-phase,8/6 srM with a lower radial *** possible geometrical alterations are proposed:one with square windows and the other with circular holes on the rotor *** windows are sized and positioned to avoid flux *** criteria are developed for the optimal window size and *** element analysis(FEA)modelling of the srM is used to validate its *** FEA results are compared with the performance parameters obtained using the analytical *** the multiphysics design tool ANsYs to obtain the natural frequencies and associated deformations through modal *** to the conventional geometry,the radial force is significantly reduced by providing windows.

关键词： 8/6 srM radial force modal analysis FEA analysis natural frequencies srM with windows

Kinematic analysis of flexible bipedal robotic systems

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Applied Mathematics and Mechanics(English Edition) 2024年第5期45卷 795-818页

作者： r.FAZEL A.M.sHAFEI s.r.NEKOO Department of Mechanical Engineering Shahid Bahonar University of KermanKerman ***Iran Departamento de Ingenieria de sistemas y Automatica Escuela Técnica Superior de IngenieriaUniversidad de SevillaSeville 41092Spain

In spite of its intrinsic complexities,the passive gait of bipedal robots on a sloping ramp is a subject of interest for numerous *** distinguishes the present research from similar works is the consideration of flexibility in the constituent links of this type of robotic *** is not a far-fetched assumption because in the transient(impact)phase,due to the impulsive forces which are applied to the system,the likelihood of exciting the vibration modes increases ***,the human leg bones that are involved in walking are supported by viscoelastic muscles and ***,for achieving more exact results,it is essential to model the robot links with viscoelastic *** this end,the Gibbs-Appell formulation and Newton's kinematic impact law are used to derive the most general form of the system's dynamic equations in the swing and transient phases of *** most important issue in the passive walking motion of bipedal robots is the determination of the initial robot configuration with which the system could accomplish a periodic and stable gait solely under the effect of gravitational *** extremely unstable nature of the system studied in this paper and the vibrations caused by the impulsive forces induced by the impact of robot feet with the inclined surface are some of the very serious challenges encountered for achieving the above-mentioned *** overcome such challenges,an innovative method that uses a combination of the linearized equations of motion in the swing phase and the algebraic motion equations in the transition phase is presented in this paper to obtain an eigenvalue *** solving this problem,the suitable initial conditions that are necessary for the passive gait of this bipedal robot on a sloping surface are *** effects of the characteristic parameters of elastic links including the modulus of elasticity and the Kelvin-Voigt coefficient on the walking stability of this type of

关键词： bipedal robot flexible link swing phase transient phase eigenvalue problem Kelvin-Voigt coefficient

A 3D In-vitro model of the human dentine interface shows long-range osteoinduction from the dentine surface

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International Journal of Oral science 2024年第2期16卷 225-237页

作者： William Macalester Asme Boussahel rafael O.Moreno-Tortolero Mark r.shannon Nicola West Darryl Hill adam Perriman school of Cellular and Molecular Medicine Biomedical Sciences BuildingUniversity of BristolUniversity WalkBristolUnited Kingdom Bristol Centre for Functional Nanomaterials HH Wills Physics LaboratoryUniversity of BristolTyndall AvenueBristolUnited Kingdom Centre for Protolife research School of ChemistryUniversity of BristolCantocks CloseBristolUnited Kingdom Max Planck-Bristol Centre for Minimal Biology School of ChemistryUniversity of BristolBristolUnited Kingdom Periodontology Bristol Dental SchoolUniversity of BristolLower Maudlin StreetBristolUnited Kingdom

Emerging regenerative cell therapies for alveolar bone loss have begun to explore the use of cell laden hydrogels for minimally invasive surgery to treat small and spatially complex maxilla-oral ***,the oral cavity presents a unique and challenging environment for in vivo bone tissue engineering,exhibiting both hard and soft periodontal tissue as well as acting as key biocenosis for many distinct microbial communities that interact with both the external environment and internal body systems,which will impact on cell fate and subsequent treatment ***,we design and bioprint a facile 3D in vitro model of a human dentine interface to probe the effect of the dentine surface on human mesenchymal stem cells(hMsCs)encapsulated in a microporous hydrogel *** demonstrate that the dentine substrate induces osteogenic differentiation of encapsulated hMsCs,and that both dentine andβ-tricalcium phosphate substrates stimulate extracellular matrix production and maturation at the gel-media interface,which is distal to the gel-substrate *** findings demonstrate the potential for long-range effects on stem cells by mineralized surfaces during bone tissue engineering and provide a framework for the rapid development of 3D dentine-bone interface models.

关键词： interface den surface

Non-symmetric differentially subordinate martingales and sharp weak-type bounds for Fourier multipliers

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science China Mathematics 2024年第8期67卷 1807-1826页

作者： Meryem Akboudj Yong Jiao adam Osękowski school of Mathematics and statistics Hunan Key Laboratory of Analytical Mathematics and ApplicationsCentral South UniversityChangsha 410075China Faculty of Mathematics Informatics and MechanicsUniversity of WarsawWarsaw 02-097Poland

Let p>2 be a given *** this paper,we prove,with the best constant,the weak-type(p,p)inequality■for a large class of non-symmetric Fourier multipliers T_(m) obtained via modulation of jumps of certain Lévy *** particular,the estimate holds for appropriate linear combinations of second-order riesz transforms and skew versions of the Beurling-Ahlfors operator on the complex *** proof rests on a novel probabilistic bound for Hilbert-space-valued martingales satisfying a certain non-symmetric subordination *** applications to harmonic functions and riesz systems on Euclidean domains are indicated.

关键词： weak-type bound Fourier multiplier martingale differential subordination laminate

Parametric investigation on the novel and cost-effective nano fly ash impregnated geopolymer system for sustainable construction

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Frontiers of structural and Civil Engineering 2024年第2期18卷 170-183页

作者： r.MOHANA s.M.Leela BHArATHI Department of Civil Engineering Mepco Schlenk Engineering CollegeSivakasi 626123India

The hazardous environmental effects of greenhouse gas emissions and climate change demand alternative sources for cementitious materials in the construction *** development of geopolymer structures provides a way of producing 100%cement-free *** this research work,a novel and simple way of deriving nano particles from waste fly ash particles is *** effect of adding the synthesized nano fly ash particles as a filler medium in geopolymer mortars was investigated by considering strength and durability *** optimization was done by using regression analysis on the geopolymer mortar and the impact of adding nano fly ash particles was studied by varying different percentages of addition ranging from 0 to 7.5%by weight of binder *** the results,it was observed that 1%nano fly ash acted not only as a filler but also as nano-sized precursors of the polymerization process,resulting in denser geopolymer *** can explain the extraordinary gain in strength of 72.11 MPa as well as the denser core with negligible level of chloride ion penetration,making the material suitable for the development of structures susceptible to marine environment.

关键词： geopolymer nano fly ash chloride ion penetration durability polymerization fillers

A modular microfluidic platform to study how fluid shear stress alters estrogen receptor phenotype in Er+breast cancer cells

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Microsystems & Nanoengineering 2024年第1期10卷 287-299页

作者： Braulio Andrés Ortega Quesada Jonathan Cuccia rachael Coates Blake Nassar Ethan Littlefield Elizabeth C.Martin adam T.Melvin Cain Department of Chemical Engineering Louisiana State UniversityBaton RougeLA 70803USA Department of Chemical and Biological Engineering Clemson UniversityClemsonSC 29634USA Biological and Agricultural Engineering Louisiana State UniversityBaton RougeLA 70803USA Department Medicine Section Hematology and Medical OncologyTulane UniversityNew OrleansLA 70118USA

Metastatic breast cancer leads to poor prognoses and worse outcomes in patients due to its invasive behavior and poor response to *** is still unclear what biophysical and biochemical factors drive this more aggressive phenotype in metastatic cancer;however recent studies have suggested that exposure to fluid shear stress in the vasculature could cause *** this study a modular microfluidic platform capable of mimicking the magnitude of fluid shear stress(Fss)found in human vasculature was designed and *** device provides a platform to evaluate the effects of Fss on MCF-7 cell line,an estrogen receptor positive(Er+)breast cancer cell line,during circulation in the *** of the effects of Fss on MCF-7 cells was carried out utilizing two approaches:single cell analysis and bulk *** single cell analysis,cells were trapped in a microarray after exiting the serpentine channel and followed by immunostaining on the device(on-chip).Bulk analysis was performed after cells were collected in a microtube at the outlet of the microfluidic serpentine channel for western blotting(off-chip).It was found that cells exposed to an Fss magnitude of 10 dyn/cm^(2) with a residence time of 60 s enhanced expression of the proliferation marker Ki67 in the MCF-7 cell line at a single cell *** understand possible mechanisms for enhanced Ki67 expression,on-chip and off-chip analyses were performed for pro-growth and survival pathways ErK,AKT,and JAK/*** demonstrated that after shearing the cells phosphorylation of p-AKT,p-mTOr,and p-sTAT3 were ***,there was no change in p-ErK1/*** is a mediator of Er rapid signaling,analysis of phosphorylated Erαwas carried out and no significant differences between sheared and non-sheared populations were *** together these results demonstrate that Fss can increase phosphorylation of proteins associated with a more aggressive phenotype in circulating cancer *** findin

关键词： fluid breast estrogen

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草食家畜 1988年第2期 56-56页

作者： r.s.adam 刘建设

问青贮制作好后,经抽样检查,半干苜蓿青贮干物质含酸性洗涤纤维(ADF)36—38％,蛋白质19—20％。可当饲喂时大多数半干青贮的ADF竟达40—42％。应如何解决这一问题? 答在青贮过程中,可溶性碳水化合物经发酵产生保护青贮作物的酸类。在... 详细信息

问青贮制作好后,经抽样检查,半干苜蓿青贮干物质含酸性洗涤纤维(ADF)36—38％,蛋白质19—20％。可当饲喂时大多数半干青贮的ADF竟达40—42％。应如何解决这一问题? 答在青贮过程中,可溶性碳水化合物经发酵产生保护青贮作物的酸类。在镇压时纤维部分的比例肯定会增加。同样,由于去除了脂肪,脱脂奶粉的蛋白质含量高于全脂奶粉(30％对25％)。

关键词：脂肪日粮青贮过程有机碘饱和度流涕鼻溢液饲喂饲养产奶量产乳量植物性

Kaapvaal lamproite melts(aka orangeites):A new type of alkalicarbonate liquid?insights from olivine-hosted multiphase inclusions(silvery Home,south Africa)

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Geoscience Frontiers 2024年第5期15卷 308-322页

作者： adam Abersteiner Alexey Tarasov Alexander Golovin Geoffrey H.Howarth Vadim s.Kamenetsky Department of Geosciences and Geography Research Programme of Geology and Geophysics(GeoHel)University of HelsinkiFinland Institute for sustainability Energy and ResourcesThe University of AdelaideAdelaide SA-5005Australia Department of Earth sciences School of Physical SciencesThe University of AdelaideAdelaide SA-5005Australia V.s.sobolev Institute of Geology and Mineralogy siberian Branch Russian Academy of SciencesRussia Department of Geological sciences University of Cape TownRondebosch 7701South Africa Center of Deep sea research Institute of OceanologyChinese Academy of Sciences266071 QingdaoChina

Kaapvaal lamproites(aka orangeites)are a group of volatile-rich(H_(2)O,CO_(2)),micaceous,ultrapotassic igneous rocks that are unique to the Kaapvaal craton in southern ***,the composition of the melts that give rise to these rocks remains poorly understood due to overprinting effects of contamination by mantle and crustal material,volatile exsolution,fractional crystallisation and post-magmatic ***,this lack of reliable data on the initial composition of the Kaapvaal lamproite melts hampers our understanding of their source,petrogenesis and ascent *** is a common mineral comprising the Kaapvaal lamproites that has both xenocrystic(i.e.,mantle)and magmatic *** inclusions(melt/fluid)entrapped within olivine have been consistently demonstrated as an effective tool for gaining fundamental insights into the composition and evolution of melts that produce both kimberlites and lamproites,prior to processes,such as eruption,devolatization and syn-/post-magmatic *** this study,multiphase inclusions of both secondary and pseudosecondary origin hosted in olivine from a Kaapvaal lamproite(silvery Home,south Africa)provide novel insights into the composition of the melt(s)that initially transported olivine to the surface and then crystallised after emplacement to form the lamproite *** inclusions in our study contain daughter mineral assemblages consisting of diverse Ca-Mg carbonates,including K-,Na-,Ba-,and sr-bearing varieties,moderate K-rich silicates(phlogopite,tetraferriphlogopite),and subordinate oxides,phosphates,sulphides,sulphates,and *** on these daughter mineral assemblages,we suggest that the composition of the melt entrapped by olivine was siO_(2)-poor,Ca-Mg carbonate-rich and contained elevated concentrations of K,Na,Ba,sr,P and *** mineral and reconstructed melt compositions are in stark contrast to the mineral association of the groundmass and the bulk-rock composition

关键词： Lamproite Kaapvaal Multiphase inclusions Olivine Orangeite