Strategies for synthesizing of nanoscale single or bimetallic lanthanide metal-organic framework (MOF) materials and their transformation into Eu1-xTbx-MOF thin films are reported. The prepared via spin coating deposition method smooth, dense mechanically stable. They also exhibit marked luminescent properties efficient Tb3+-to-Eu3+ energy transferability.

Precise control over size and morphology of metal–organic frameworks (MOFs) is challenging but important for extending these hybrid materials to many more advanced applications, in particular nanotechnology device integration. Through studying parameters the fabrication nanosized Dy(BTC)(H2O) MOF crystals using sodium acetate as modulator, this paper discloses two essential miniaturizing nanometer scale. One proper acid–base environment reaction medium which governs deprotonation organic...

The Meerwein-Ponndorf-Verley (MPV) transfer hydrogenation of aldehydes and ketones to the corresponding alcohols is distinguished by its exceptional chemoselectivity. This reaction particularly suited for reduction unsaturated ketones, compared catalytic reductions with molecular hydrogen using noble metal catalysts. MPV has traditionally been carried out homogeneous catalysts like aluminium or titanium alkoxides. However, over past two decades, an increasing number reports on heterogeneous...

The vortex electromagnetic (EM) wave carrying orbital angular momentum (OAM) has attracted much attention in radar applications. Aimed at the moving target detection application of EM waves, Doppler effect and micro-Doppler (m-D) effect, both including linear shift shift, are investigated. theoretical analyses demonstrate that m-D vortex-EM-wave-based significantly more complicated than those traditional non-vortex-EM-wave-based radar, can provide additional features for identification...

A method to reduce the volume of a circularly polarized Vivaldi-inspired antenna array by bending radiation arms is proposed in this letter. Two orthogonal Vivaldi elements form cross-shaped configuration rotating sequentially. For miniaturization and impedance match, two element are bent opposite directions then folded cross-structure excited wideband feeding network with 90 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math...

A novel folded reflectarray and transmitarray antenna (FRTA), featuring a long distance, no diffraction, high mode purity, low profile, is proposed to generate high-order Bessel beams carrying orbital angular momentum (OAM). First, two meta-atoms are designed for full 2π phase coverage amplitude variation from 0 1. Second, metasurfaces constructed adjust independently, with horn integrated the upper metasurface as feeding source. Finally, FRTA simulated, fabricated, measured verify its...

Abstract The synthesis of methanethiol from CS 2 catalyzed by Ni‐, Co‐, or K‐modified MoS /SiO through the sequence →CH 3 SH→CH SCH (DMS) has been studied. is readily hydrogenated to CH SH, whereas SH and DMS decompose 4 at high conversions temperatures. Thus, very yields can be obtained on all catalysts. addition Co Ni accelerates reaction steps allow formation under relatively mild conditions. On contrary, K suppresses byproducts but also lowers activity. surface proceeds a series...

Some design methods for band-pass filters based on half- wavelength resonators have been proposed. The main feature of these is that n or + 1transmission zeros can be generated a structure composed resonators. To demonstrate the usefulness proposed filter structures, three kinds two-pole compact microstrip hairpin are designed and fabricated. Good agreement between measured simulated data has demonstrated.

A dual-band omnidirectional circularly polarized (CP) antenna using composite right/left-handed (CRLH) transmission line (TL) with miniaturized size is presented. The consists of a circular radiation patch and ground connected by three copper shorting vias, on which rectangular slits are etched. Two sets opposite branches arranged in sequence around the to widen impedance bandwidth (BW). zeroth-order resonance (ZOR) structure CRLH-TL meandering technology allow miniaturization antenna,...

This letter describes the design of compact broadband circularly polarized (CP) array antenna based on Vivaldi element. Four sequentially rotated elements are bent into aperture for miniaturization and fed by a 1-to-4 integrated feeding network with identical amplitude orthogonal phase. A coupling metal patch is mounted top to enhance impedance, circular polarization, gain characteristics. prototype fabricated measured demonstration purposes, results show 10 dB impedance bandwidth (IBW)...

Traditional helix antenna is firstly modified to radiate orbital angular momentum (OAM) wave, which has a compact size and an outstanding gain. Firstly, general principle of generating OAM by introduced. Secondly, field pattern electromagnetic distribution on are analyzed. Then, based the preceding analysis, dual-OAM-mode designed, fabricated, measured. Instead using traditional helical wire, this prototype realized PCB flexible dielectric laminate, rolled into hollow cylinder. This makes...

In addition to traditional linear Doppler shift, the angular shift in vortex electromagnetic wave (VEMW) radar systems carrying orbital momentum (OAM) can provide more accurate target identification micro-motion parameters, especially detailed features perpendicular line-of-sight (LOS) direction. this paper, a feature extraction method for spinning with multiple scattering points based on VEMW is proposed. First, multi-scattering-point detection model using established, and mathematical...

Abstract Composite films with low dielectric constants ( k ) containing micro‐ and mesopores are synthesized from precursor solutions for the preparation of mesoporous silica ethanolic suspensions silicalite‐1 nanoparticles. The material contains nanoparticles (include nanocrystals nanoslabs/intermediates) embedded in a randomly oriented matrix highly porous silica. Micropores result incorporated nanoparticles, while decomposition porogen F127 leads to additional mesopores. porosity...

Since the radar echo of space target satisfies sparseness, compressed sensing (CS) theory can be used to reconstruct information with data much lower than Nyquist sampling rate. For vortex electromagnetic wave (VEMW) radar, since azimuth also use CS significantly reduce requirement resolution on amount mode data. Based above analysis, this paper proposes a CS-based VEMW imaging sequence optimization method. Firstly, model is deduced, and beam steering method performed adjust direction...

With the development of high-speed integrated circuit, Ultra Wideband (UWB) communication system has been developed toward direction miniaturization, integration, which will necessarily promote UWB antenna also be etc. This paper proposes an improved structure Vivaldi antenna, loads resistance at bottom exponential type to improve Voltage Standing Wave Ratio (VSWR) low frequency, and opens three symmetrical unequal rectangular slots in radiation part increase gain. The size is 150 mm * mm,...

Vortex electromagnetic (EM) wave radar can obtain more accurate rotation parameters for target classification and recognition. However, the existing parameter extraction methods are difficult to acceleration initial phase of composite moving in case multiple scattering points. In this paper, estimation error accelerated motion features a situation with numerous points is examined first time, along method extracting based on vortex radar. Firstly, relationship between characteristics non...

A novel double folded quarter mode substrate integrated waveguide (DFQMSIW) resonator is proposed.The dominant resonant of the proposed TE 101 mode.The size DFQMSIW cavity reduced nearly by 94% compared with conventional SIW cavity.A three order cascaded filter a center frequency 2.84 GHz and fractional bandwidth 11.5% implemented.The measured results show that insertion losses are below -1.8 dB return better than -15 dB.Good agreement between simulated demonstrates validity method.

A method for synthesising a novel hexagonal filter with source-load coupling is presented. The equivalent circuit of the lowpass prototype general lossless coupled resonator proposed, and corresponding transfer function t(s) derived. quasi-elliptic microstrip designed fabricated. Simulated measured results are Compared conventional cross-coupling filter, proposed acquires more than 27.5% size reduction provides improved selectivity by relatively small bandwidth.