Search query: spectrum tailored defective

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abstract: The wide spectral range of the solar flux with undesirable diffused energy distribution remains a substantial impediment to the high efficiency utilization of the whole spectrum. Here, inspired by the spectrally selective sunlight utilization of plants, a spectrum tailored solar harnessing aerogel is conceived. It is composed of oxygen vacancy (Ov) defect rich semiconductor HNb3O8 (D HNb3O8) nanosheets and polyacrylamide (PAM) framework to perform all in one photochemical and photothermal full solar energy conversion. The aerogel selectively utilizes the whole solar spectrum, in which high energy ultraviolet (UV) photon is converted into high redox potential electron hole pairs, while low energy visible near infrared (NIR) photons are transformed into heat. The designed solar absorber polymer composite shows energy harnessing conversion capability with desired heat insulation, reactant enrichment, rapid mass diffusion and capillary pumping characteristics, thus realizing a high efficient steam generation and photochemical activity. This cooperative photochemical and photothermal solar energy conversion, at respective optimal working spectrum, holds great promise for optimizing and maximizing the solar energy utilization, as well as opening up opportunities to explore simultaneous multifunctional usage of solar energy.
author_names: Min-Quan Yang

Chuan Fu Tan

Wanheng Lu

Kaiyang Zeng

Ghim Wei Ho
title: Spectrum Tailored Defective 2D Semiconductor Nanosheets Aerogel for Full Spectrum Driven Photothermal Water Evaporation and Photochemical Degradation
year: 2020

abstract: Molecular beam epitaxy (MBE) offers benefits such as the capability for growth of compositionally tailored heterostructures and in situ doping of HgCdTe alloys. These capabilities were applied to the growth of long wave infrared unispectral focal plane arrays (FPA) with 480x4 elements. The detectivity (D* map of the FPA demonstrated performance that was higher than the specification value, with no defective channels. Two color detectors with the n p n architecture, for the simultaneous detection of two closely spaced bands in the midwave infrared spectrum were also grown by MBE. These devices exhibited sharp turn off and turn on in both bands. The quantum efficiency was greater than 70% and average R deg A values exceeded 1x10 6 O cm 2 in both bands. These result demonstrate that high performance HgCdTe devices can be grown by MBE.
author_names: Rajesh D Rajavel

Douglas M Jamba

John E Jensen

Owen K T Wu

Charles A Cockrum

Jerry A Wilson

E A Patten

K Kosai

Joseph P Rosbeck

P M Goetz

G M Venzor
title: High Performance HgCdTe Detectors Grown by Molecular Beam Epitaxy
year: 1996

abstract: Bactericidal nanoparticle coatings are very promising for hindering the indirect transmission of pathogens through cross contaminated surfaces. The challenge, limiting their employment in nosocomial environments, is the ability of tailoring the coating's physicochemical properties, namely, composition, cytotoxicity, bactericidal spectrum, adhesion to the substrate, and consequent nanoparticles release into the environment. We have engineered a new family of nanoparticle based bactericidal coatings comprising Ag, Cu, and Mg and synthesized by a green gas phase technique. These coatings present wide spectrum bactericidal activity on both Gram positive and Gram negative reference strains and tunable physicochemical properties of relevance in view of their "on field" deployment. The link between material and functional properties is rationalized based on a multidisciplinary and multitechnique approach. Our results pave the way for engineering biofunctional, fully tunable nanoparticle coatings, exploiting an arbitrarily wide number of elements in a straightforward, eco friendly, high throughput, one step process.
author_names: Giulio Benetti

Emanuele Cavaliere

Rosaria Brescia

Sebastian Salassi

Riccardo Ferrando

Andre Vantomme

Lucia Pallecchi

Simona Pollini

Selene Boncompagni

Beatrice Fortuni

Margriet J Van Bael

Francesco Banfi

Luca Gavioli
title: Tailored Ag Cu Mg multielemental nanoparticles for wide spectrum antibacterial coating.
venue: Nanoscale
year: 2019

abstract: A spectrum tailored multicast flow aggregation (ST MFA) scheme which deletes all invalid spectrum on each link of a light tree is proposed. Simulation results show that it accommodates more demands and is more spectrum efficient.
author_names: Xiaolei Xu

Xian Zhang

Haijing Hou

Haiyan Shen
title: Spectrum Tailored Multicast Flow Aggregation Scheme in Elastic Optical Data Center Network
venue: 2018 Asia Communications and Photonics Conference (ACP)
year: 2018

abstract: Abstract Sulfate radical (SO4 based oxidation is an efficient and selective strategy for environmental decontamination. Herein, we confirmed, for the first time, that the fine modulation on semiconducting TiO2 was able to improve the redox cycling capability for heterogeneous peroxydisulfate (PDS, S2O82 activation and radicals generation. PDS activation by defective TiO2 x exposed by high energy {0 0 1} polar facets was a superior Fenton like catalytic system for rhodamine B (RhB) and bisphenol A (BPA) degradation, with good activity and selectivity under neutral pH. By radical inhibiting tests with two different scavengers, fluorescence measurements with terephthalic acid and electron paramagnetic resonance (EPR) technique, only the SO4 was identified to be the main reactive species from PDS activation on defective TiO2 x for pollutants degradation. Compared to the reported TiO2 x/H2O2 system, the proposed TiO2 x/PDS system exhibited much lower water matrix effects in the presence of four typical anions, natural organic matters and real surface water for target pollutants degradation. The selective SO4 mediated TiO2 x/PDS catalytic system in natural water matrix and the no toxicity of catalytic material were of considerable interest for practical environmental applications with highly complex chemistry. Our findings elucidated a new strategy for efficient and selective PDS activation based on the defect related chemistry, which can degrade environmental contaminants and remedy contaminated soil based on sulfate components with much reduced matrix effects.
author_names: Ai-Yong Zhang

Nai-Hui Huang

Yuantao He

Pin-Cheng Zhao

Jingwei Feng
title: Sulfate radicals generation and refractory pollutants removal on defective facet tailored TiO2 with reduced matrix effects
venue: Chemical Engineering Journal
year: 2019

abstract: Abstract In this work, the transmittance spectrum of a defective one dimensional photonic crystal is numerically calculated using the transfer matrix method and two fluid model. The photonic crystal is embedded in air and composed alternating layers of a superconductor (HgBa2Ca2Cu3 O8+d) and a semiconductor (GaAs) with GaAs defects. The dependence of hydrostatic pressure on the critical temperature of the superconductor, dielectric function of the semiconductor, angular frequency of the transverse optical phonons, and thickness of the semiconductor layer is determined. By increasing the pressure, the photonic band gap width increases and the defect mode shifts to larger frequencies. When the thickness of the superconductor increases while the pressure and thickness of the semiconductor layers are kept constant, the PBG width also increases but the defect mode shifts to shorter frequencies. Moreover, when considering two GaAs defects, the coupling between the defect modes decreases as the separation of the defects increases.
author_names: Francis Segovia-Chaves

Herbert Vinck-Posada
title: Tunable transmittance spectrum in one dimensional photonic crystals composed of HgBa2Ca2Cu3O8+/GaAs with a defective GaAs layer
venue: Optik
year: 2019

abstract: Abstract We theoretically calculate the transmittance spectrum of TE polarization in a one dimensional photonic crystal that is embedded in air, composed alternating layers of the YBa2Cu3O7 x superconductor and the BaTiO3 dielectric, using the transfer matrix method. In the first part of this study, we found the transmittance spectrum of the regular structure (without defects) We observe that new photonic band gaps (PBGs) can be observed with a continuous increase in width by increasing the thickness of the superconductor layer and by maintaining the temperature and the thickness of the dielectric in case of normal incidence. By increasing the temperature while maintaining the layer thickness fixed, the dielectric constant of the superconductor can be increased, resulting in a small shift of the transmittance spectrum at long wavelengths. In addition, the PBG widths are observed to be sensitive to an increase in the angle of light incidence. In the second part of this study, the translational symmetry of the crystal is broken by inserting a YBa2Cu3O7 x defective layer. Further, we demonstrate the existence of a defective mode in the visible range within the PBG. By increasing the thickness of the defective layer, this defective mode can be observed at long wavelengths. Additionally, the defect mode can be tuned by increasing the temperature and by maintaining a constant crystal thickness. We can also observe a shift to short wavelengths of the defect mode while increasing the angle of incidence.
author_names: Francis Segovia-Chaves

Herbert Vinck-Posada
title: Transmittance spectrum in a regular one dimensional photonic crystal and with the insertion of a YBa2Cu3O7 defective layer
venue: Optik
year: 2019

abstract: Frank Ter Haar syndrome (FTHS) Winchester syndrome (WS) and multicentric osteolysis, nodulosis, and arthropathy (MONA) are ultra rare multisystem disorders characterized by craniofacial malformations, reduced bone density, skeletal and cardiac anomalies, and dermal fibrosis. These autosomal recessive syndromes are caused by homozygous mutation or deletion of respectively SH3PXD2B (SH3 and PX Domains 2B) MMP14 (matrix metalloproteinase 14) or MMP2. Here, we give an overview of the clinical features of 63 previously reported patients with an SH3PXD2B, MMP14, or MMP2 mutation, demonstrating considerable clinical overlap between FTHS, WS, and MONA. Interestingly, the protein products of SH3PXD2B, MMP14, and MMP2 directly cooperate in collagen remodeling. We review animal models for these three disorders that accurately reflect the major clinical features and likewise show significant phenotypical similarity with each other. Furthermore, they demonstrate that defective collagen remodeling is central in the underlying pathology. As such, we propose a nosological revision, placing these SH3PXD2B, MMP14, and MMP2 related syndromes in a novel "defective collagen remodelling spectrum (DECORS)" In our opinion, this revised nosology better reflects the central role for impaired collagen remodeling, a potential target for pharmaceutical intervention.
author_names: Ivo J H M de Vos

Arnette Shi Wei Wong

Tim Welting

Barry J Coull

Maurice A M van Steensel
title: Multicentric osteolytic syndromes represent a phenotypic spectrum defined by defective collagen remodeling
venue: American journal of medical genetics. Part A
year: 2019

abstract: Spectrum splitting for hybrid photovoltaic/thermal (PV/T) collectors presents an opportunity to deliver higher combined efficiencies than either technology alone. Nanofluids offer an inexpensive alternative to spectrum splitting mirrors, and serve both as an optical filter and a heat transfer mechanism. This paper introduces experimental testing of spectrum splitting nanofluids for three cells: c Si, GaAs, and Ge solar cells. The nanofluids were composed of combinations of core shell silver silica (Ag SiO2) nanoplates as visible light absorbers and silica coated gold and gold copper nanorods as infrared absorbers. These nanoparticles were suspended in various concentrations in either a water or oil base fluid according to the spectral response of the solar cell. Indoor test results are presented for all three cell types. The Ag SiO2 aqueous fluid, paired with a c Si PV cell, delivered the highest combined efficiency, which indicates that this PV nanofluid combination is a strong candidate for a low cost, high efficiency spectrum splitting technology.
author_names: Natasha E Hjerrild

Felipe Crisostomo

Robert Lee Chin

Jason Scott

Rose Amal

Robert A Taylor
title: Experimental Results for Tailored Spectrum Splitting Metallic Nanofluids for c Si, GaAs, and Ge Solar Cells
venue: IEEE Journal of Photovoltaics
year: 2019

abstract: The rare autoinflammatory disease mevalonate kinase deficiency (MKD, which includes HIDS and mevalonic aciduria) is caused by recessive, pathogenic variants in the MVK gene encoding mevalonate kinase. Deficiency of this enzyme decreases the synthesis of isoprenoid lipids and thus prevents the normal post translational prenylation of small GTPase proteins, which then accumulate in their unprenylated form. We recently optimized a sensitive assay capable of detecting unprenylated Rab GTPase proteins in peripheral blood mononuclear cells (PBMCs) and showed that this assay distinguished MKD from other autoinflammatory diseases. We have now analyzed PBMCs from an additional six patients with genetically confirmed MKD (with different compound heterozygous MVK genotypes) and compared these with PBMCs from three healthy volunteers and four unaffected control individuals heterozygous for the commonest pathogenic variant, MVKV377I. We detected a clear accumulation of unprenylated Rab proteins, as well as unprenylated Rap1A by western blotting, in all six genetically confirmed MKD patients compared to heterozygous controls and healthy volunteers. Furthermore, in the three subjects for whom measurements of residual mevalonate kinase activity was available, enzymatic activity inversely correlated with the extent of the defect in protein prenylation. Finally, a heterozygous MVKV377I patient presenting with autoinflammatory symptoms did not have defective prenylation, indicating a different cause of disease. These findings support the notion that the extent of loss of enzyme function caused by biallelic MVK variants determines the severity of defective protein prenylation, and the accumulation of unprenylated proteins in PBMCs may be a sensitive and consistent biomarker that could be used to aid, or help rule out, diagnosis of MKD.
author_names: Marcia A Munoz

Julie Jurczyluk

Anna Katharina Simon

Pravin Hissaria

Rob J W Arts

David Coman

Christina A Boros

Sam Mehr

Michael J Rogers
title: Defective Protein Prenylation in a Spectrum of Patients With Mevalonate Kinase Deficiency
venue: Front. Immunol.
year: 2019