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11 papers found.
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Smart Cylindrical Dome Antenna Based on Active Frequency Selective Surface

In this paper, we proposed a beamforming antenna, which is realized using an omnidirectional antenna in the center surrounded by a cylindrical smart dome. The smart dome is made of 16 active frequency selective surface columns of which the amplitude and phase response can be continuously tuned by varying the bias voltages of the employed varactors. Thus, the performance of the...

A Potential Density Gradient Dependent Analysis Scheme for Ocean Multiscale Data Assimilation

This study addresses how to maintain oceanic mixing along potential density surface in ocean data assimilation (ODA). It is well known that the oceanic mixing across the potential density surface is much weaker than that along the potential density surface. However, traditional ODA schemes allow the mixing across the potential density surface and thus may result in extra...

Reconstruction of Typhoon Structure Using 3-Dimensional Doppler Radar Radial Velocity Data with the Multigrid Analysis: A Case Study in an Idealized Simulation Context

Extracting multiple-scale observational information is critical for accurately reconstructing the structure of mesoscale circulation systems such as typhoon. The Space and Time Mesoscale Analysis System (STMAS) with multigrid data assimilation developed in Earth System Research Laboratory (ESRL) in National Oceanic and Atmospheric Administration (NOAA) has addressed this issue...

Reconstruction of Typhoon Structure Using 3-Dimensional Doppler Radar Radial Velocity Data with the Multigrid Analysis: A Case Study in an Idealized Simulation Context

Extracting multiple-scale observational information is critical for accurately reconstructing the structure of mesoscale circulation systems such as typhoon. The Space and Time Mesoscale Analysis System (STMAS) with multigrid data assimilation developed in Earth System Research Laboratory (ESRL) in National Oceanic and Atmospheric Administration (NOAA) has addressed this issue...

Near-field spectroscopic investigation of dual-band heavy fermion metamaterials

Shaoqing Zhang in:Nature Research journals • PubMed • Google Scholar Search for Fengrui Hu in:Nature Research journals • PubMed • Google Scholar Search for Jiawei Zhang in:Nature Research journals • PubMed

An extreme event of sea-level rise along the Northeast coast of North America in 2009–2010

Dynamics Laboratory, NOAA, Princeton, New Jersey 08540, USAStephen M. Griffies & Shaoqing Zhang AuthorsSearch for Paul B. Goddard in:Nature Research journals • PubMed • Google ScholarSearch for Jianjun Yin ... in:Nature Research journals • PubMed • Google ScholarSearch for Stephen M. Griffies in:Nature Research journals • PubMed • Google ScholarSearch for Shaoqing Zhang in:Nature Research journals • PubMed • Google

Temporal and Spatial Changes in Black Carbon Sedimentary Processes in Wetlands of Songnen Plain, Northeast of China

Black carbon (BC), an important component of organic carbon (OC) produced from incomplete combustion of carbon compounds, is widespread and affects the global carbon storage. The objectives of this study were to analyze the BC contents and fluxes in the last 150 years to determine the causes of differences in the three profiles of the Songnen Plain of Northeast China and to...

A Study of Coupling Parameter Estimation Implemented by 4D-Var and EnKF with a Simple Coupled System

Coupling parameter estimation (CPE) that uses observations to estimate the parameters in a coupled model through error covariance between variables residing in different media may increase the consistency of estimated parameters in an air-sea coupled system. However, it is very challenging to accurately evaluate the error covariance between such variables due to the different...

Perovskite-polymer hybrid solar cells with near-infrared external quantum efficiency over 40%

In the past several years, conjugated polymers and organometal halide perovskites have become regarded as promising light-absorbing materials for next-generation photovoltaic devices and have attracted a great deal of interest. As the main part of this contribution, we describe the enhancement of near-infrared (NIR) photoresponse of well-known CH3NH3PbI3−x Cl x -based solar cells...

Environmentally-friendly solvent processed fullerene-free organic solar cells enabled by screening halogen-free solvent additives

Though the power conversion efficiencies (PCEs) of organic solar cells (OSCs) have been boosted to 12%, the use of highly pollutive halogenated solvents as the processing solvent significantly hinders the mass production of OSCs. It is thus necessary to achieve high-efficiency OSCs by utilizing the halogen-free and environmentally-friendly solvents. Herein, we applied a halogen...

Nanoscale probing of electron-regulated structural transitions in silk proteins by near-field IR imaging and nano-spectroscopy

Silk protein fibres produced by silkworms and spiders are renowned for their unparalleled mechanical strength and extensibility arising from their high-β-sheet crystal contents as natural materials. Investigation of β-sheet-oriented conformational transitions in silk proteins at the nanoscale remains a challenge using conventional imaging techniques given their limitations in...