gebhart/patrepeval huggingface dataset:
Comparative Evaluation of Three-Phase AC-AC Voltage/Current-Source Converter Systems Employing Latest GaN Power Transistor Technology (2022)

The emergence of monolithic bidirectional GaN power transistors sparks renewed interest in AC-AC current-source converters (CSCs) as an alternative to AC-AC voltage-source converters (VSCs) for motor drive applications. This paper compares the two approaches with the CSC utilizing novel 600 V, 140 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathrm{m}\Omega$</tex> monolithic bidirectional GaN transistors. Aiming for a comparison of next-generation plug-and-play motor drives, both systems must fulfill the same EMI limits that cover an extended frequency range from 9 kHz to 30 MHz at the grid and at the motor interface. Designing both systems with roughly the same total chip area for the same AC-AC efficiency of 97 % at a nominal power of 1.4 kW (200 V nominal line-to-line RMS voltage, 4 A nominal RMS current), we identify a suitable switching frequency of 72 kHz, and we discuss efficiency characteristics over the motor current (torque) and voltage (speed) ranges. A comparison of the total magnetic component volumes finds advantages for the VSC system, which disappear if motor-integration (voiding the need for a motor-side differential-mode EMI filter) is considered.
[112] Oriented Terfenol-D Composites (2002)

This paper describes the manufacture and testing of polymer matrix Terfenol-D particulate composites fabricated with a [112] preferred crystal orientation. The results demonstrate that crystal orientation permits higher saturation strain than previously obtained in particulate composites. Oriented particle composites were fabricated using needle shaped Terfenol-D particulate made from commercially available [112] textured polycrystals. A magnetic field applied during manufacture oriented the particles along their longest dimension. Three materials of 22, 36, and 49% particulate volume fraction, were produced and tested to obtain the magnetostriction at constant mechanical loads from 0.5 to 16 MPa. Results demonstrate that crystallographically oriented particle composites saturate at 1475 microstrain whereas the previous non-oriented particle composite saturates at 1150 microstrain. The authors attribute the increased magnetostriction to a predominance of particle orientation along the [112] crystal direction. Modulus measurements indicate that the composites can be described using an upper bound 1–3 composite model. Upper bound rule of mixtures models show that the 36% and 49% oriented particle composites exhibit 94% and 90% respectively of the predicted upper bound magnetostriction. Further rule of mixtures models are used to illustrate how applied stress increases the effective anisotropy in composites as a function of particulate volume fraction. The results demonstrate that by preferential orientation of particles, Terfenol-D particulate composite materials may be fabricated with magnetostriction properties close to that of bulk Terfenol-D.
Deep subwavelength Fabry-Perot resonances (2014)

Confinement of light by subwavelength objects facilitates the realization of compact photonic devices and the enhancement of light-matter interactions. The Fabry-Perot (FP) cavity provides an efficient tool for confining light. However, the conventional FP cavity length is usually comparable to or larger than the light wavelength, making them inconvenient for many applications. By manipulating the reflection phase at the cavity boundaries, the FP cavity length could be made much smaller than the wavelength. In this review, we consider the subwavelength FP resonance in a plasmonic system composed of a slit grating backed with a ground plane, covering the spectral range from microwave to THz and infrared regime. For very narrow slit width and spacer thickness, a typical zero-order and deep subwavelength FP resonance in the metallic slits can be strongly induced. Moreover, due to the subwavelength FP resonance, greatly enhanced electromagnetic pressure can also be induced in the system. The sign and magnitude of the electromagnetic pressure are dominated by the field penetration effect in the metal as well as the field enhancement in the FP cavities. The effect promises a variety of potential applications, such as detecting tiny motions and driving the mechanical oscillations.
55-inch 8K4K IPS-LCDs with high frame frequency, wide color gamut, and stereovision (2018)

An 8K4K-LCD with the diagonal size of 55 inch has been developed. The backplane is based on an amorphous silicon (a-Si) technology and can operate at 120Hz, which is achieved by developing a technology to compensate the charging voltage of pixels. The realization of a high resolution of 8K4K and a high frame frequency of 120Hz is the world first for LCDs with a-Si backplanes. Moreover, a backlight system with laser light sources expands the color gamut. The newly developed LCD covers 99% of color space defined in BT.2020. Additionally, we have established three dimensional 8K4K technology. A 3D polarization filter is attached on the 55-in. 8K4K LCD. The vertical viewing angle of 8K-3D LCD prototype is 8.6 degrees at its optimal viewing position set to 1.2m.
Modelling biomechanics of volunteers subject to loading by a motorized shoulder belt tensioner (2007)

Motorized shoulder belt tensioning is an occupant protection technology that has potential to reduce collision injuries. There is not a biofidelic model of shoulder belt tensioning that has been validated against experimental data. A lumped-mass model was developed and validated characterizing the biomechanical response of volunteers during motorized shoulder belt tensioning. The 5th percentile female, 50th percentile male and 95th percentile male population groups were studied. For the covering abstract see ITRD E141762.
Modeling and Simulation of Wireless Packet Erasure Channels (2006)

We will present a new model for wireless packet erasure channels, which can be used for both theoretical analysis and real-time simulation of network protocol performance. The correlation between successive packet losses will be described by a higher-order Markov process, which can be transformed into an equivalent first-order Markov chain, such that all major performance measures can be derived from the model. Since our approach belongs to the class of generative discrete channel models, it can also be used as a stochastic source to reproduce an infinite sequence of erasure indicator values with desired stochastic properties. Thus, it can be easily implemented into network simulation environments in terms of a lossy link element, where both short-term and long-term fading on the mobile radio link are taken into account separately. Finally, we will show some modeling results for a GSM GPRS system, which is a packet-oriented transmission service to be launched in Europe in spring 2000. In addition, we will demonstrate the effects of different packet sizes and channel coding rates on end-to-end throughput.
Structures and Properties of Supramolecular Liquid-Crystalline Side-Chain Polymers Built through Intermolecular Hydrogen Bonds (1996)

The design, structure, and properties of supramolecular liquid-crystalline side-chain polymers are described. In particular, we show how several simple H-bonding building blocks can be used for the formation of various liquid-crystalline structures. Poly[4-(6-(acryloyloxy)hexyl- and -undecyloxy)benzoic acid] (PmOBA; m = 6, 11) have been employed as polymer components. A variety of supramolecular mesogenic “copolymers” based on one polymeric component have been designed and prepared by simple self-assembly. Cooperation of the hydrogen bond and electron donor−acceptor interactions results in the mesophase stabilization for the “copolymeric” supramolecular structures of PmOBA with a mixture of trans-4-methoxy-4‘-stilbazole (1OSz) and trans-4-cyano-4‘-stilbazole (SzCN) or trans-4-nitro-4‘-stilbazole (SzNO2). When a bifunctional molecule, 4,4‘-bipyridine (BPy), is used as a component for “copolymeric” structures, supramolecular copolymeric networks based on PmOBA have been formed by self-assembly. The networks exhibit stable mesomorphic behavior and reversible phase transitions due to the dynamics of the hydrogen bonds.
The red form of [Re(phen)(CO)3(H2O)]CF3SO3.H2O (1999)

The coordination geometry of the cations in the red form of aquatricarbonyl(1,10-phenanthroline-N,N')rhenium(I) trifluoromethanesulfonate hydrate, [Re(C12H8N2)(CO)3-(H2O)]CF3SO3.H2O, is approximately octahedral, with a facial arrangement of the linearly coordinated carbonyl ligands. The phenanthroline (phen) ligands interleave to form a columnar pi-stacked structure.
Transient arrest in proteasomal degradation during inhibition of translation in the unfolded protein response (2007)

The UPR (unfolded protein response) activates transcription of genes involved in proteasomal degradation. However, we found that in its early stages the UPR leads to a transient inhibition of proteasomal disposal of cytosolic substrates (p53 and p27kip1) and of those targeted to ER (endoplasmic reticulum)-associated degradation (uncleaved precursor of asialoglycoprotein receptor H2a). Degradation resumed soon after the protein synthesis arrest that occurs in early UPR subsided. Consistent with this, protein synthesis inhibitors blocked ubiquitin/proteasomal degradation. Ubiquitination was inhibited during the translation block, suggesting short-lived E3 ubiquitin ligases as candidate depleted proteins. This was indeed the case for p53 whose E3 ligase, Mdm2 (murine double minute 2), when overexpressed, restored the degradation, whereas a mutant Mdm2 in its acidic domain restored the ubiquitination but did not completely restore the degradation. Inhibition of proteasomal degradation early in UPR may prevent depletion of essential short-lived factors during the translation arrest. Stabilization of p27 through this mechanism may explain the cell cycle arrest in G1 when translation is blocked by inhibitors or by the UPR.
H-Field Probe with Active Balun for MRI-Conditional Testing of Medical Devices (2018)

This work presents the design and construction of a H-field probe with active balun for MRI (magnetic resonance imaging) conditional testing of medical devices. The H-field probe was designed using a small loop antenna with 2 mm radius to have high spatial resolution and sensitivity. It was tuned and matched at a center frequency of 128 MHz, which corresponds to 3 T MRI systems or equivalent RF exposure systems. An active balun with a gain 18.28 dB and noise figure of 0.5 dB was employed to boost the detected H-field signal level. The designed Hfield probe and active balun have been fabricated on a doublesided printed circuit board (PCB), FR4 thickness of 1.57 mm and a copper thickness of 35 μm, with overall footprint of 22 mm × 11 mm.
Simple techniques for chemical imaging at many wavelengths simultaneously using a novel 2D to 1D optical fiber array (2000)

A dimension reduction technique is described that allows chemical images to be obtained using an image-guide sensor simultaneously at many different wavelengths with very high spectral resolution. Dimension reduction is accomplished using a custom 2D to 1D square fiber-optic array that is made by using approximately 600 individual 25 micron square fibers. The technique allows the concurrent detection of multiple analytes and is demonstrated using a combination CO<SUB>2</SUB>/O<SUB>2</SUB> sensor, in two different sensor configurations. The technique is being extended for lifetime-based image-guide sensors.
A Model Order Selection Criterion With Applications to Cardio-Respiratory-Renal Systems (2005)

We introduce a model order selection criterion called signal prediction error (SPE) for the identification of a linear regression model, which can be an adequate representation of a resting physiologic system. SPE is an estimate of the prediction error variance due only to model estimation error and not unobserved noise, which distinguishes it from the widely used final prediction error (FPE). We then present a theoretical analysis of SPE, which predicts that its ability to select correctly the model order is more dependent on the signal-to-noise ratio (SNR) and less dependent on the number of data samples available for analysis. We next propose a heuristic procedure based on SPE (called SPE(D)) to improve its robustness to SNR levels. We then demonstrate, through simulated physiologic data at high SNR levels, that SPE will be equivalent to consistent model order selection criteria for long data records but will become superior to FPE and other model order selection criteria as the size of the data record decreases. The simulated data results also show that SPE(D) is indeed a significant improvement over SPE in terms of robustness to SNR. Finally, we demonstrate the applicability of SPE and SPE(D) to actual cardio-respiratory-renal data.
<title>Techniques for improving the throughput of VBR streams</title> (1998)

In this paper, we propose a novel mechanism for providing deterministic service for Variable Bit Rate (VBR) streams at the disk. Previous approaches have relied on peak-rate of the stream for admission control for providing deterministic service. The proposed scheme allows statistical multiplexing of VBR streams at the storage system while providing deterministic service guarantees. We show that the proposed scheme can significantly improve stream throughput compared to peak-rate based schemes. We also evaluate the impact of other strategies such as data smoothing, statistical guarantees and higher stream startup latencies for improving the throughput of VBR streams. We show that stream startup latency can be effectively traded off for improving the stream throughput. We also show that smoothing and statistical guarantees do not provide significant additional improvements in stream throughput beyond the proposed approach.
ChemInform Abstract: A Rapid Approach for the Optimization of Polymer‐Supported Reagents in Synthesis. (2001)

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Predictors of adverse diastolic remodeling in non-diabetic patients presenting with ST-elevation myocardial infarction (2023)

NIH, NCT01217307. Prospectively registered on October 8th 2010, https://clinicaltrials.gov/ct2/show/NCT01217307 .
Sirocco: cost-effective fine-grain distributed shared memory (1998)

Software fine-grain distributed shared memory (FGDSM) provides a simplified shared-memory programming interface with minimal or no hardware support. Originally software FGDSMs targeted uniprocessor-node parallel machines. This paper presents Sirocco, a family of software FGDSMs implemented on a network of low-cost SMPs. Sirocco takes full advantage of SMP nodes by implementing inter-node sharing directly in hardware and overlapping computation with protocol execution. To maintain correct shared-memory semantics, however SMP nodes require mechanisms to guarantee atomic coherence operations. Multiple SMP processors may also result in contention for shared resources and reduce performance. SMP nodes also impact the cost trade-off. While SMPs typically charge higher price-premiums, for a given system size SMP nodes substantially reduce networking hardware requirement as compared to uniprocessor nodes. In this paper, we ask the question Are SMPs cost-effective building blocks for software FGDSM? We present experimental measurements on Sirocco implementations ranging from an all-software system to a system with minimal hardware support. Together with simple cost models we show that low-cost SMP nodes: (i) result in competitive performance with uniprocessor nodes, (ii) substantially reduce hardware requirement and are more cost-effective than uniprocessor nodes, (iii) significantly benefit from hardware support for coherence operations, and (iv) are especially beneficial for FGDSMs with high-overhead coherence operations.
Segmentation of nodular medulloblastoma using Random Walker and Hierarchical Normalized Cuts (2011)

Medulloblastoma (MB) is the most common brain tumor in children. Recent studies have demonstrated a relationship between specific signaling pathway abnormalities, a tendency to more favorable outcomes, and a histopathological feature: nodular growth patterns. In this work we present a new segmentation scheme which requires minimal user interaction to segment nodules on MB histopathological sections. Our segmentation scheme consists of two steps: (1) color reduction using Hierarchical Normalized Cuts (HNCut), (2) Random Walker (RW) segmentation within the reduced HNCut color space. Across a cohort of 18 nodular MB images, our integrated HNCut and RW scheme yielded nodule segmentations with a Dice coefficient of 83:55 ± 12:4% and Predictive Positive Value (PPV) of 93:71 ± 9:0%.
The Application of 3-D Electronic Speckle Pattern Interferometry in Assembly Process of Bolted Joints (2005)

&lt;div class="htmlview paragraph"&gt;In this paper, an optical method for inspecting the bolt tension is presented. This method uses 3-D Electronic Speckle Pattern Interferometry (ESPI) technique to measure and monitor the deformation field on the surface of the clamped member, and to establish a reliable correlation with the bolt tension. A new torque-deformation tension control concept is presented on the basis of this deformation - bolt tension relationship. Because the relationship between the bolt tension and deformation is independent of the frictional variables of the bolt, the inspection and control accuracy by this optical method is more reliable than relying on the torque-tension relationship. This experimental study is completed on a bolted joint. The relationship between the in-plane deformation on a clamped pin and the bolt tension is established. The method for eliminating the effect of the rotation on the deformation measurement is provided. Repeatability experiment shows that tension scatter from deformation-tension signature established in this paper is much smaller than that relying on torque-tension signature.&lt;/div&gt;
Very High Frequency Resonant Boost Converters (2007)

This document presents a resonant boost topology suitable for very high frequency (VHF, 30-300 MHz) dc-dc power conversion. The proposed design features low device stress, high efficiency over a wide load range, and excellent transient performance. Two experimental prototypes have been built and evaluated. One is a 110 MHz, 23 W converter which uses a high performance rf LDMOSFET. The converter achieves higher than 87% efficiency at nominal input and output voltages, and maintains good efficiency down to 5% of full load. The second implementation, aimed towards integration, is a 50 MHz 17 W converter which uses a transistor from a 50 V integrated power process. In addition, two resonant gate drive schemes suitable for VHF operation are presented, both of which provide rapid startup and low-loss operation. Both converters regulate the output using high-bandwidth on-off hysteretic control, which enables fast transient response and efficient light-load operation. The low energy storage requirements of the converters allow the use of coreless inductors in both designs, thereby eliminating magnetic core loss and introducing the possibility of easy integration.
The Effect of Imperfect Channel Estimation on the Performance of Maximum Ratio Combining in the Presence of Cochannel Interference (2006)

In this paper, the effects of imperfect channel estimation on maximum ratio combining performance in receive antenna diversity systems with multiple cochannel interferers are examined. The channel considered is a slowly varying flat Rayleigh fading channel that is also spatially independent. The combiner weights are the imperfect estimates of the desired user's fading coefficients and are assumed to be complex Gaussian distributed. Closed-form expressions for signal-to-interference-plus-noise ratio distribution and outage probability are obtained for both equal-power and unequal-power interferer scenarios. Using these expressions, the effect of channel estimation quality on system performance is investigated
A new dominant peroxiredoxin allele identified by whole-genome re-sequencing of random mutagenized yeast causes oxidant-resistance and premature aging (2010)

The combination of functional genomics with next generation sequencing facilitates new experimental strategies for addressing complex biological phenomena. Here, we report the identification of a gain-of-function allele of peroxiredoxin (thioredoxin peroxidase, Tsa1p) via whole-genome re-sequencing of a dominantSaccharomyces cerevisiae mutant obtained by chemical mutagenesis. Yeast strain K6001, a screening system for lifespan phenotypes, was treated with ethyl methanesulfonate (EMS). We isolated an oxidative stress-resistant mutant (B7) which transmitted this phenotype in a background-independent, monogenic and dominant way. By massive parallel pyrosequencing, we generated an 38.8 fold whole-genome coverage of the strains, which differed in 12,482 positions from the reference (S288c) genome. Via a subtraction strategy, we could narrow this number to 13 total and 4 missense nucleotide variations that were specific for the mutant. Via expression in wild type backgrounds, we show that one of these mutations, exchanging a residue in the peroxiredoxin Tsa1p, was responsible for the mutant phenotype causing background-independent dominant oxidative stress-resistance. These effects were not provoked by altered Tsa1p levels, nor could they be simulated by deletion, haploinsufficiency or over-expression of the wild-type allele. Furthermore, via both a mother-enrichment technique and a micromanipulation assay, we found a robust premature aging phenotype of this oxidant-resistant strain. Thus, TSA1-B7 encodes for a novel dominant form of peroxiredoxin, and establishes a new connection between oxidative stress and aging. In addition, this study shows that the re-sequencing of entire genomes is becoming a promising alternative for the identification of functional alleles in approaches of classic molecular genetics.
Diethylsilane Decomposition on Silicon Surfaces Studied Using Transmission FTIR Spectroscopy (1992)

Fourier transform infrared (FTIR) transmission spectroscopy was used to monitor the decomposition of diethylsilane (DES) [(CH~CH2)2SiH2] on high surface area porous silicon samples.The FrIR spectra revealed that DES dissociatively adsorbs on porous silicon to form Sill and SiCH~.CHs species.The infrared absorbances of the CH2CH3 stretching vibrations at 2955-2879 cm -1 and the Sill stretching vibration at 2088 cm -1 were employed to monitor the decomposition of the SiCH2CH3 surface species.As the silicon surface was annealed to 500-750 K, the SiCH2CH3 species decomposed to produce gas phase ethylene [CH2 ~ CH2] and additional Sill surface species.These reaction products were consistent with a ~-hydride elimination reaction.Above 700 K, the Sill surface species decreased concurrently with the desorption of H2 from the porous silicon surface.The uptake of surface species was also monitored at various adsorption temperatures to determine the optimal DES exposure temperatures for silicon deposition.Carbon contamination was minimal at DES adsorption temperatures below 640 K prior to H2 desorption.Because the DES adsorption process is self-limiting at temperatures below 640 K, DES may be a useful molecular precursor for the atomic layer epitaxy of silicon.