In 1929, Hermann Weyl derived the massless solutions from Dirac equation - relativistic wave for electrons. Neutrinos were thought, decades, to be fermions until discovery of neutrino mass. Moreover, it has been suggested that low energy excitations in condensed matter can Hamiltonian. Recently, photons have also proposed emerge as particles inside photonic crystals. all cases, two linear dispersion bands three-dimensional (3D) momentum space intersect at a single degenerate point point....

Two-photon-pumped dye lasers are very important because of their applications in wavelength up-conversion, optical data storage, biological imaging and photodynamic therapy. Such difficult to realize the solid state aggregation-caused quenching. Here we demonstrate a new two-photon-pumped micro-laser by encapsulating cationic pyridinium hemicyanine into an anionic metal-organic framework (MOF). The resultant MOF⊃dye composite exhibits significant two-photon fluorescence large absorption...

Frequency doubling: A strategy for incorporating dipolar organic chromophores into the one-dimensional channels of an anionic metal–organic framework (MOF) has been developed to generate highly active nonlinear optical materials (see picture). The resulting MOF material shows a second-harmonic generation intensity 18.3 versus α quartz. Detailed facts importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They...

Narrow bandwidth is a fundamental issue plaguing practical applications of metamaterial absorbers. In this Letter, we show that by deliberately controlling the dispersion and dissipation metamaterial, an ultrawideband perfect absorber with complex-valued constitutive parameters strictly satisfying modified model perfectly matched layer, can be achieved. The nearly power absorption, better than 99%, was experimentally observed in unprecedented 39%, approaching theoretical Rozanov limit. We...

The real-time State Space Representation (SSR) product of the GNSS (Global Navigation Satellite System) orbit and clock is one most essential corrections for precise point positioning (PPP). In this work, performance current SSR products from eight analysis centers were assessed by comparing it with final accuracy PPP. Numerical results showed that (1) accuracies GPS better than 8 cm satellite 0.3 ns clock; (2) GLONASS (GLObalnaya NAvigatsionnaya Sputnikovaya Sistema) 10 RMS (Root Mean...

Over recent years, flexible strain sensors have been playing an increasingly important role, especially in wearable electronics, healthcare equipment, electronic skins (e-skins), and soft robots. Numerous materials are utilized these applications; however, thermoplastic polyurethane (TPU) is prominently used for its elastomer-like behavior, suitable flexibility, facility of combination with diverse conductive materials. These characteristics satisfy the growing demands better stretchability,...

Electromagnetic materials lacking local time-reversal symmetry, such as gyrotropic materials, are of keen interest and importance both scientifically technologically. Scientifically, topologically nontrivial phenomena, photonic chiral edge states, allow for reflection-free transport even in the presence large disorder. Technologically, nonreciprocal devices, optical isolators circulators, play critical roles communication computing technologies because their ability to eliminate cross-talk...

In this paper, we experimentally realized a steering antenna using type of active metamaterial with tunable refractive index. The is by periodically printed subwavelength metallic resonant patterns embedded microwave varactors. effective index can be controlled low direct-current (dc) bias voltage applied to the In-phase electromagnetic waves transmitting in different zones such slab experience phase delays, and, consequently, output direction transmitted wave steered progressive shift along...

This article demonstrated the design and fabrication of a transmitter receiver (TR) microsystem in Ka-band based on silicon 3-D heterogeneous-integration (3D-HI). To achieve this microsystem, we proposed novel interposer with bonded metal redistribution layer (RDL), which solved compatibility problem involved eutectic bond wirebond processes. A brand new temperature-gradient-free stacking method achieved by printing conductive adhesive bonding technology is also presented, reduces...

In this paper, we modify uniaxial perfectly matched layer to an entirely passive medium and demonstrate its experimental realization using a deep sub-wavelength metamaterial surface. The relative permittivity permeability of the surface are matched, mostly imaginary-valued, far greater than unity. These conditions allow impedance be completely air, produce extremely large internal dissipation, resulting in 99.97% power absorption at normal incidence within thickness about 1/40 free space wavelength.

Frequenzverdopplung: Eine Strategie, mit der dipolare organische Chromophore in die Kanäle eines anionischen Metall-organischen Gerüsts (MOF) eingefügt werden, wurde zur Herstellung hochaktiver nichtlinear-optischer Materialien entwickelt (siehe Bild). Das MOF-Material zeigt eine Frequenzverdopplung einer Intensität von 18.3 relativ zu α-Quarz.

Background There is increasing acknowledgment of the potential role that diet rich in antioxidants may play prevention anemia. As a significant indicator antioxidant-rich diet, relationship between composite dietary antioxidant index (CDAI) and anemia has not been extensively studied. Therefore, this study aims to explore association CDAI Methods Utilizing datas from 2003–2018 National Health Nutrition Examination Survey (NHANES) database. The was calculated using six antioxidants, based on...

This study explores the dynamic contracting problem in venture capital (VC) investment, where compensation to entrepreneurs incorporates absolute and relative performance. Using Stackelberg game, we uncover a paradox investment strategies driven by startup efficiency. Optimal involve fixed allocation for efficient startups investments inefficient ones or early-stage transitioning later. We further examine equity competition incentives, highlighting that under high correlation uncertainty,...

In this article, the problem of Bayesian detecting rank-one distributed targets under subspace interference and compound Gaussian clutter with inverse texture is investigated. Due to heterogeneity, training data may be insufficient. To tackle problem, speckle covariance matrix (CM) assumed obey complex Wishart distribution, theory utilized obtain an effective estimation. Moreover, target echo a known steering vector unknown amplitudes across range cells. The regarded as that linearly...

Structural safety of buildings within the transit-oriented development (TOD) framework is paramount. multi-tower-podium structures are commonly employed in TOD projects. In order to investigate impact varying numbers towers on structural dynamic characteristics and responses, this paper conducts a comprehensive exploration shaking table tests typical building featuring number employing thick slab transfer frame as podium. This study presents detailed account test setup outcomes, including...

We show that a metallic plate with fractal-shaped slits can be homogenitized as plasmonic metamaterial plasmon frequency dictated by the fractal geometry.Owing to all-dimensional subwavelength nature of pattern, our system supports both transverse-electric and transverse-magnetic surface plasmons.As result, this structure employed focus light sources resolutions enhanced field strengths.Microwave experiments reveal best achievable resolution is only /15 λ , simulations demonstrate similar...

A new six-branched chromophore GGQ1 is designed and synthesized via the incorporation of an FTC-type 1 with phenyl glycerol ester. The shows a large molecular weight 3834 Daltons can directly form thin films quite high active loading density. For comparison, guest–host doped polymer are fabricated by doping BF1 into poly(4-vinylphenol). All these show saturated trend in second harmonic generation coefficient (d33) maximum d33 value between 50–70 pm V−1 around concentration 25 wt%, due to...