/pdf/a-break-in-the-clouds-towards-a-cloud-definition-svovsw1r5a.pdf

A Break in the Clouds: Towards a Cloud Definition

The broadband and tunable high-performance microwave absorption properties of an ultralight and highly compressible graphene foam (GF) are investigated. Simply via physical compression, the microwave absorption performance can be tuned. The qualified bandwidth coverage of 93.8% (60.5 GHz/64.5 GHz) is achieved for the GF under 90% compressive strain (1.0 mm thickness). This mainly because of the 3D conductive network.

Broadband and Tunable High‐Performance Microwave Absorption of an Ultralight and Highly Compressible Graphene Foam

https://iopscience.iop.org/article/10.1088/1468-6996/16/2/023501/pdf

Recent progress on magnetic iron oxide nanoparticles: synthesis, surface functional strategies and biomedical applications.

13. 벼잎선충의 약제처리 방법별 방제 효과

Graphene has a unique atom-thick two-dimensional (2D) structure, high conductivity and charge mobility, huge specific surface area, excellent mechanical, thermal and electrical properties. Thus, it has been regarded as an important component for functional materials, especially for developing a variety of catalysts. In this review, we summarize the recent advancements in synthesizing graphene based new catalysts, and their applications in organic synthesis, sensors, environmental protection and energy related systems.

Graphene based catalysts

Microwave absorbing properties of a thermally reduced graphene oxide/nitrile butadiene rubber composite

Advances in Photonic Crystals and Devices

In this communication, we theoretically report the reflection properties of a photonic crystal with alternate layers of air and GaAs for specified values of the lattice parameters. By employing the transfer matrix approach, the reflection spectra of the layered media are obtained for chosen sets of number of unit cells and incident angles. It is observed that the photonic crystals with different number of unit cells completely reflect a wide band in the infrared region of radiation. Also, we find that the reflectivity decreases and the completely reflected bands are shifted towards lower wavelength side with increase in the incident angle. Further, the reflected broadbands in the reflection spectra correspond to the forbidden ranges of wavelength obtained by using the analogy of Kronig-Penney model. It indicates that the completely reflected ranges are forbidden bandgaps, which is considered as an important feature of the proposed photonic crystals.

/pdf/photonic-crystals-as-infrared-broadband-reflectors-with-4eb6yzgshw.pdf

Photonic crystals as infrared broadband reflectors with different angles of incidence: a comparative study

Synthesis and Investigations on Microwave Absorption Properties of Core–Shell FeCo(C) Alloy Nanoparticles

The tunable broadband reflector and the narrowband filter of a periodic structure composed of dielectric and magnetized cold plasma materials have been studied. The optical properties are calculated theoretically using the well-known simple transfer matrix method (TMM). Dispersion relation and transmission spectra of the considered structure with right-hand polarization and left-hand polarization of the magnetized cold plasma materials are studied. The right-hand polarization and the left-hand polarization of the magnetized cold plasma are exhibited due to positive and negative values of the external magnetic field, respectively. The dispersion relation and transmission spectra of the considered periodic structure with the most valuable parameters, like external magnetic field, electron density, and effective collision frequency of the magnetized cold plasma, have been analyzed. The tunable narrow filter for right-hand polarization is obtained with a high value of the external magnetic field and a low value of the electron density. The broadband filter for the left-hand polarization is investigated with a low value of the external magnetic field and a high value of the electron density of the magnetized cold plasma. It is also noted that the impact of variation of effective collision frequency of the magnetized cold plasma is minute in both cases. These calculated results reveal an innovative idea for designing the tunable broadband reflector and narrowband filter.

Narendra Kumar

Papers

Microwave absorbing properties of a thermally reduced graphene oxide/nitrile butadiene rubber composite

Advances in Photonic Crystals and Devices

Photonic crystals as infrared broadband reflectors with different angles of incidence: a comparative study

Synthesis and Investigations on Microwave Absorption Properties of Core–Shell FeCo(C) Alloy Nanoparticles

Tunable broadband reflector and narrowband filter of a dielectric and magnetized cold plasma photonic crystal