gebhart/patrepeval huggingface dataset:
Two-dimensional photonic-crystal-slab channel-drop filter with flat-top response (2005)

We report a theoretical and experimental study of a channel drop filter with two cascaded point-defects between two line-defects in a two-dimensional photonic-crystal slab. Using coupled-mode analysis and a three-dimensional finite-difference time-domain method, we design a filter to engineer the line shape of the drop spectrum. A flat-top and sharp roll-off response is theoretically and experimentally achieved by the designed and fabricated filters. Furthermore, we theoretically demonstrate that drop efficiency is increased dramatically, up to 93%, by introducing hetero-photonic-crystals. We also describe a method to modify the bandwidth of the spectrum.
Conjugated Polyelectrolytes as Water Processable Precursors to Aqueous Compatible Redox Active Polymers for Diverse Applications: Electrochromism, Charge Storage, and Biocompatible Organic Electronics (2017)

An organic soluble precursor polymer was prepared by direct (hetero)arylation polymerization of 3,4-ethylenedioxythiophene (EDOT) with a solubilizing, 3,4-propylenedioxythiophene (ProDOT) derivative bearing ester-functionalized side chains. Chemical defunctionalization of the polymer, using base to hydrolyze the esters, yields a conjugated polyelectrolyte (CPE) that is readily soluble in water. This aqueous soluble CPE can then be processed using high-throughput coating methods from water-based inks. Postprocessing functionalization of the polymer film using dilute acid creates a solvent resistant film that is compatible with both organic and aqueous electrolyte systems for redox switching. The introduction of an unfunctionalized EDOT unit results in a soluble polymer that has a low oxidation potential and that is highly electroactive and pseudocapacitive in a wide voltage range (2 V in propylene carbonate-based electrolytes and 1.55 V in aqueous electrolytes) making it an attractive material for lightweight and flexible supercapacitors. Films of this copolymer demonstrate exceptionally rapid redox switching (10 V/s) and higher mass capacitance in aqueous electrolyte solutions than in organic solutions. Supercapacitors incorporating the solvent resistant copolymer exhibit symmetric charge/discharge behavior at currents of up to 20 A/g (1 s discharge) and are able to maintain >75% of the initial capacitance over 175 000 cycles using 0.5 M NaCl/water as the device electrolyte. Rapid electrochromic switching (∼0.2 s) from vibrant blue to colorless is also maintained in this salt–water electrolyte. The versatility of this polymer is further shown in a series of organic and aqueous electrolyte systems, including biologically compatible electrolytes (NaCl/water, Ringer’s solution, and human serum) and even sport drinks (Gatorade and Powerade), demonstrating the robustness of this polymer to differing ionic conditions. Based on these results, it is apparent that this polymer and similar systems have great potential in multiple electrochemical applications such as electrochromic devices, supercapacitors, and biocompatible devices.
Steady state Kalman Filter behavior for unstabilizable systems (2014)

Some important textbooks on Kalman Filters suggest that positive semidefinite solutions to the filtering Algebraic Riccati Equation (ARE) cannot be stabilizing should the underlying state variable realization be unstabilizable. We show that this is false. Questions of uniqueness of positive semidefinite solutions of the ARE are also unresolved in the absence of stabilizability. Yet fundamental performance issues in modern communications systems hinge on Kalman Filter performance absent stabilizability. In this paper we provide a positive semidefinite solution to the ARE for detectable systems that are not stabilizabile and show that it is unique if the only unreachable modes are on the unit circle.
Dye-sensitized Solar Cell Fabricated by Electrostatic Layer-by-Layer Assembly of Amphoteric TiO2 Nanoparticles (2003)

Nanocrystalline TiO2 amphoteric colloidal charged particles and polyelectrolytes have been used to fabricate a dye-sensitized solar cell. Two weak polyelectrolytes, poly(allylamine hydrochloride) and poly(acrylic acid), and two strong polyelectrolytes, poly(dimethyldiallylammonium chloride) (PDAC) and poly(sodium 4-styrenesulfonate), have been utilized to assemble polyion/TiO2 nanocomposite multilayered films by the electrostatic layer-by-layer deposition technique. The layer-by-layer assembly of the TiO2 nanoparticles proceeds linearly as shown by sequential UV−vis absorption and thickness measurements. The morphology of these assemblies was characterized using atomic force microscopy. The nanoporous polyion/TiO2 films were sintered and used as working electrodes for cis-di(thiocyanato)-N,N-bis(2,2‘-bipyridyldicarboxylate)-ruthenium(II) (N3) sensitized solar cells. I−V characteristics of the solar cells made by the calcinated polyelectrolyte/TiO2 electrodes show several interesting results. (i) The short-circuit current does not linearly increase with the thickness of the TiO2 electrode, even though the adsorption behavior of the N3 dye shows a linear increase. (ii) The precursor polyelectrolytes used to assemble TiO2 play a major role in the photovoltaic performance of the solar cells. Thermogravimetric analysis studies show that the thermal stability of the polyelectrolytes may have a direct effect on the overall device efficiency. (iii) The photovoltaic performance of these solar cells is comparable to that of cells made by other methods such as spin casting, the layer-by-layer technique offers unsurpassed control in manipulating the final device thickness. An efficiency of 7.2% was obtained for the solar cell made from PDAC/TiO2 (200 bilayers) precursor film, under 1 sun at simulated Air Mass 1.5 direct irradiation.
(S)-2-[(R)-Fluoro(phenyl)methyl]oxirane: A General Reagent for Determining the ee of α-Chiral Amines (2010)

ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionORIGINAL ARTICLEThis notice is a correction(S)-2-[(R)-Fluoro(phenyl)methyl]oxirane: A General Reagent for Determining the ee of α-Chiral AminesSergi Rodríguez-Escrich, Dana Popa, Ciril Jimeno, Anton Vidal-Ferran*, and Miquel A. Pericàs*Cite this: Org. Lett. 2010, 12, 13, 3116Publication Date (Web):May 28, 2010Publication History Received16 April 2010Published online28 May 2010Published inissue 2 July 2010https://pubs.acs.org/doi/10.1021/ol1008735https://doi.org/10.1021/ol1008735correctionACS PublicationsCopyright © 2010 American Chemical Society. This publication is available under these Terms of Use. Request reuse permissions This publication is free to access through this site. Learn MoreArticle Views960Altmetric-Citations3LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail PDF (45 KB) Get e-AlertscloseSUBJECTS:Amines,Chemical structure,Halogenation Get e-Alerts
Organosolv Lignin for Non-Isocyanate Based Polyurethanes (NIPU) as Wood Adhesive (2021)

A non-isocyanate-based polyurethane (NIPU) wood adhesive was produced from organosolv lignin, which is a bio-sourced raw material, available in large quantities and produced as a by-product of the paper industry. The formul... | Find, read and cite all the research you need on Tech Science Press
Metabolic capability and in situ activity of microorganisms in an oil reservoir (2018)

Our data expand current knowledge of the metabolic potential and role in hydrocarbon metabolism of individual members of thermophilic microbial communities from an oil reservoir. The study also reveals potential metabolic exchanges based on vitamin and amino acid auxotrophies indicating the presence of complex network of interactions between microbial taxa within the community.
Design and Analysis of a Programmable Single-Chip Architecture for DVB-T Base-Band Receiver (2003)

This work treats the design and analysis of a programmable (or reconfigurable) DSP-domain-specific architecture called MorphoSys, upon which the world's first single-chip software solution for a DVB-T base-band receiver can be implemented. Based on the first version of MorphoSys, many modifications have been made to improve greatly both computation power and data movement efficiency. Sequential codes and SIMD codes can be parallelized; temporal granularity adjustment boosts performance up to 4 times: numerous different types of data movement can be accelerated 8 to 64 times faster than sequential movement. As a complicated (21 GOPS) and typical communication system, the DVB-T base-band receiver is designed with low performance loss and mapped onto MorphoSys architecture (>28 GOPS). This solidly contributes to software defined radio development.
Non-collinear generation of ultra-broadband parametric fluorescence photon pairs using chirped quasi-phase matching slab waveguides (2023)

Many optical quantum applications rely on broadband frequency correlated photon pair sources. We previously reported a scheme for collinear emission of high-efficiency and ultra-broadband photon pairs using chirped quasi-phase matching (QPM) periodically poled stoichiometric lithium tantalate (PPSLT) ridge waveguides. However, collinearly emitted photon pairs cannot be directly adopted for applications that are based on two-photon interference, such as quantum optical coherence tomography (QOCT). In this work, we developed a chirped QPM device with a slab waveguide structure. This device was designed to produce spatially separable (photon pair non-collinear emission) parametric fluorescence photon pairs with an ultra-broadband bandwidth in an extremely efficient manner. Using a non-chirped QPM slab waveguide, we observed a photon pair spectrum with a full-width-at-half-maximum (FWHM) bandwidth of 26 nm. When using a 3% chirped QPM slab waveguide, the FWHM bandwidth of the spectrum increased to 190 nm, and the base-to-base width is 308 nm. We also confirmed a generation efficiency of 2.4×10<sup>6</sup> pairs/(μW·s) using the non-chirped device, and a efficiency of 8×10<sup>5</sup> pairs/(μW·s) using the 3% chirped device under non-collinear emission conditions after single-mode fiber coupling. This is, to the best of our knowledge, the first report of frequency correlated photon pairs generation using slab waveguide device as a source. In addition, using slab waveguides as photon pair sources, we performed two-photon interference experiments with the non-chirped device and obtained a Hong-Ou-Mandel (HOM) dip with a FWHM of 7.7 μm and visibility of 98%. When using the 3% chirped device as photon pair source, the HOM measurement gave a 2 μm FWHM dip and 74% visibility.
Signal propagation analysis by Digital Lock-in Time Resolved Imaging (2012)

Time Resolved Imaging (TRI) allows real time imaging of transitions in CMOS gates. This technique has been validated down to low power 45 nm technology. TRI is very useful to analyze signal propagation after a clock edge. Nevertheless, TRI dimensional (x, y, t) data are not well adapted for direct visualization of propagation times: (x, y, t) data allows either a movie output or a slice by slice visualization for each time step or a chosen spot chronograms. To overcome these limitations, we have developed and validated a new signal propagation analysis technique by Digital Lock-in Time Resolved Imaging. It gives a 2D image of propagation time that can be used for accurate analysis of signal propagation.
Plasma Flow Control on Low Aspect Ratio Wings at Low Reynolds Numbers (2010)

Results of an ongoing study on flow control on low aspect ratio wings are presented. The Reynolds number regime Re < 100 000 is aimed at micro air vehicle (MAV) applications. Force measurements for different wing–actuator combinations are compared and the frequency response of lift increase at different angles of attack is discussed. A frequency nondimensionalization for active flow control on low aspect ratio wings inspired by bluff body aerodynamics is proposed to make the frequency scan data independant of angle of attack. To gain insight into the changes of flowfield characteristics as control is applied both time mean and phase averaged PIV data are presented and discussed.
Progressive Apraxia in Clinically Discordant Monozygotic Twins (1995)

Corticobasal degeneration may remain clinically discordant in identical twins after 7 years. Positron emission tomography and neuropsychologic findings suggest the possibility of a preclinical stage of corticobasal degeneration. There is generalized cortical atrophy in patients with corticobasal degeneration in addition to focal atrophy.
Phonon Dynamics in Parent and Superconducting FeAs Compounds (2011)

The comparison of the phonon spectra of the parent MFe2As2 (M = Ba, Ca, Sr) and MFeAsF (M = Ca, Sr) compounds show a very strong renormalization in the lower and intermediate frequency part of the vibrations. Mass effects and lattice contraction cannot solely explain these changes. Further, the measurement of temperature dependence of phonon density of states across the magnetic/structural phase transition temperature indicates that softening of low energy modes in the paramagnetic state of these compounds may be due to the interaction of phonons with electron or short-range spin fluctuations in the normal state of the superconducting compound as well as in the parent compound. Detailed lattice dynamical calculations are carried out to analyze the experimental data.
Dimensional Parameters Controlling Capillary Underfill Flow for Void-Free Encapsulation of a Direct Bonded Heterogeneous Integration (DBHi) Si-bridge Package (2022)

We have proposed Direct Bonded Heterogeneous Integration (DBHi) as a new packaging technology. In a DBHi package, a bridge chip is bonded to and in between two adjacent processor chips, this multi-chip with a bridge is then joined on an organic laminate with a cavity that houses the bridge chip. Because a DBHi package has a coefficient of thermal expansion mismatch between organic and silicon materials, it is important that the space between an organic laminate and silicon chips is filled with underfill (UF) to provide mechanical reinforcement. However, with the particular DBHi package geometry it is difficult to fill a gap between the bridge chip and the cavity, which often leads to void entrapment. Therefore, the objective of this study is to evaluate the effects of dimensional parameters of the package on capillary underfill (CUF) flow and void entrapment propensity. For the evaluation, a transparent glass mock-up of the DBHi package was prepared, and UF flow behavior was observed directly. Eventually, the experimental results indicate that a gap between the sidewalls of the bridge chip and its cavity should be equal to or smaller than the other gaps where UF flows such that the force dragging UF into the cavity prevails. Moreover, it is suggested that when the structure is designed for UF flow control, not only the absolute values but also the relative values of the gaps should be considered because the dragging forces generated by capillary pressure are stronger in narrower gaps.
Eclogites and basement terrane tectonics in the northern arm of the Grenville orogen, NW Scotland (2023)

The presence of eclogites within continental crust is a key indicator of collisional orogenesis and they have been used worldwide to assist in the delineation of ancient collisional sutures. Eclogites within the Eastern Glenelg basement inlier of the Northern Highland Terrane (NHT) have been re-dated in order to provide more accurate constraints on the timing of collision within the northern arm of the Grenville Orogen. The eclogites yield dates of c.1200 Ma which are interpreted to record the onset of convergence, and the NHT as a whole is thought to represent the lower plate in successive 1200-1000 Ma collision events. The Eastern Glenelg basement inlier is viewed as a fragment of the leading edge of the NHT basement that was partially subducted along a suture and then obducted back up the subduction channel. Differences in ages of igneous protoliths and intrusive histories (Storey et al., 2010; Strachan et al., 2020b), and metamorphic events (this paper) between the NHT basement and the Laurentian foreland, suggests that they were separate crustal blocks until after c. 1600 Ma. We therefore suggest that: 1) the NHT represents a fragment of Archean-Paleoproterozoic crust that was reworked within the c. 1600-1700 Ga Labradorian-Gothian belt, although whether it was derived from Laurentia or Baltica (Strachan et al., 2020b) is uncertain (Fig. 3), and 2) amalgamation of the NHT with the Laurentian foreland did not occur until the terminal stages of the Grenville collision at c. 1000 Ma.
Sparse sign-consistent Johnson–Lindenstrauss matrices: Compression with neuroscience-based constraints (2014)

Johnson-Lindenstrauss (JL) matrices implemented by sparse random synaptic connections are thought to be a prime candidate for how convergent pathways in the brain compress information. However, to date, there is no complete mathematical support for such implementations given the constraints of real neural tissue. The fact that neurons are either excitatory or inhibitory implies that every so implementable JL matrix must be sign consistent (i.e., all entries in a single column must be either all nonnegative or all nonpositive), and the fact that any given neuron connects to a relatively small subset of other neurons implies that the JL matrix should be sparse. We construct sparse JL matrices that are sign consistent and prove that our construction is essentially optimal. Our work answers a mathematical question that was triggered by earlier work and is necessary to justify the existence of JL compression in the brain and emphasizes that inhibition is crucial if neurons are to perform efficient, correlation-preserving compression.
Apoptosis induction of human leukemia cells by Streptomyces sp. SY-103 metabolites through activation of caspase-3 and inactivation of Akt (2009)

We isolated 23 marine actinomycetes from seawater samples. Of these, strain SY-103 exhibited the strongest cytotoxic activity on human leukemic cell lines. Biochemical tests and 16S rDNA sequencing of this strain allowed us to identify SY-103 as a strain of the genus Streptomyces. In the present study, the pure cytotoxic compound (PCC) from Streptomyces sp. SY-103 metabolites was purified by reverse-phase HPLC and the biochemical mechanisms of PCC-induced apoptosis in cultured human leukemic cell lines were investigated. The exposure of cells to PCC resulted in growth inhibition and induction of apoptosis, which was associated with the proteolytic activation of caspase-3 and down-regulation of anti-apoptotic Bcl-2 protein. However, PCC-induced caspase-3 activation and apoptosis were significantly attenuated in Bcl-2 overexpressing U937 cells. z-DEVD-fmk, a caspase-3 specific inhibitor, blocked caspase-3 activation and increased the survival rate of PCC-treated U937 cells. The activity of Akt was also inhibited in PCC-treated cells, and phosphatidylinositol 3-kinase (PI3K)/Akt inhibitor, LY294002, sensitized the cells to PCC-induced apoptosis indicating that the down-regulation of the Akt signaling pathway plays a key role in PCC-induced apoptosis. Our findings imply that some of the biological functions of Bcl-2 and PI3K/Akt are attributed to their ability to inhibit PCC-induced apoptosis; therefore, it is suggested that this compound is a promising anti-cancer agent for leukemia cells.
Electromagnetic wind radar simulator validation using meteorological data and a zenith X-band radar (2016)

This paper presents the validation of an electromagnetic radar simulator based on Large Eddy Simulations of the turbulent atmosphere. The simulator has been developed by UCL in the frame of the FP7 UFO project aimed at improving the Wake-Vortex Advisory Systems by the analysis, design and development of innovative technologies for Ultra-Fast Radar and Lidar used as wind and Eddy Dissipation Rate sensors. Experimental trials have taken place at Toulouse airport giving access to concurrent collocated X-band radar data and meteorological data. The simulator is validated against radar and meteorological values of Eddy Dissipation Rate, showing a good agreement, with a trend to have meteorological values somewhat higher than radar measured and simulated values.
Vitamin D metabolism and expression in rats fed on low-calcium and low-phosphorus diets (1978)

1. Cholecalciferol, radioactively labelled with both (14)C and (3)H, was administered weekly for 7 weeks to rats that had been depleted of vitamin D for 4 weeks before repletion with the radioactive vitamin. This permitted measurement of the steady-state effect on vitamin D metabolism of low-calcium and low-phosphorus regimens, as compared with a normal mineral intake. These dietary manoeuvres were carried out during the last 3 weeks of repletion. Cholecalciferol, 25-hydroxycholecalciferol and 1,25-dihydroxycholecalciferol were determined in plasma, intestine, kidney and bone. Ca(2+)-binding-protein content was measured in intestine and kidneys of comparable animals. 2. In rats on the low-calcium diets, 1,25-dihydroxycholecalciferol concentration was elevated in plasma, bone, kidney and intestine, and intestinal Ca(2+)-binding protein was increased to over twice the concentration found in the control animals. 3. The low-phosphorus regimens led to a decrease in plasma phosphate and 1,25-dihydroxycholecalciferol in all tissues studied, for the latter to the point where it was undetectable in plasma and bone. Intestinal and renal concentrations of Ca(2+)-binding protein were unchanged in the low-phosphate-intake group and decreased in the very-low-phosphate-intake group. 4. It is concluded that in the rat, unlike in the chick, hypophosphataemia is not associated with a stimulation of the production of 1,25-dihydroxycholecalciferol or its expression in the synthesis of Ca(2+)-binding protein. Therefore the plasma phosphate concentration does not appear to be directly involved in the regulation of the functional metabolism of vitamin D.
A New Development Strategy of Light Wight Solid Oxide Fuel Cells for Electrified Airplane System (2019)

In this study, all materials that comprised solid oxide fuel cell (SOFC) stacks were re-deigned for the low temperature operation below 873K and weight saving. For weight saving of SOFC stacks, introduction of lightweight component materials and improvement of cell performance for high current density operation are needed. In estimation of SOFC stacks for 75kW power generation, weight power density reached to 1.20 kW/kg although system weight was not taken into account. Since SOFC stack unit is heaviest parts in the system, the weight power density including system can qualify over 0.3kW/kg.