gebhart/patrepeval huggingface dataset:
Resolving the Mechanisms of Photocurrent Improvement in Ternary Organic Solar Cells (2019)

The ultralow band gap small-molecule IEICO-4F has been employed as a secondary acceptor in both fullerene-based (PTB7-Th:PC71BM) and nonfullerene-based (PBDB-T:ITIC) ternary organic solar cells (OSCs). Structural characterization methods combined with ultrafast spectroscopy have been applied to resolve the mechanisms, leading to the observed improvement in device efficiency upon addition of IEICO-4F. It is shown that IEICO-4F forms ternary mixed domains in the host systems and improves the device efficiency by broadening the absorption spectral range and enhancing both charge separation and charge transport. The enhanced crystallinity of the semiconductor polymer electron donors in the presence of the EIECO-4 provides additional channels for ultrafast charge transfer and transport compared to binary systems. The optimum ternary blend formulations required to improve device efficiencies are reported. This work provides new insights into the fabrication of high-performance ternary OSCs.
User Association for Ultra-Dense mmWave Networks With Multi-Connectivity: A Multi-Label Classification Approach (2019)

Millimeter wave (mmWave) communication has been considered as a promising means to fulfill the requirements of next generation cellular networks. To conquer the limited coverage and the severe penetration attenuation, we investigate the ultra-dense mmWave networks with multi-connectivity in this letter, which enables users to access multiple mmWave base stations simultaneously. A user association problem is formulated to maximize the system throughput, which is NP-hard. To tackle it, we introduce a multi-label classification approach to solve the proposed combinatorial problem. Numerical results demonstrate the good optimality and low computational complexity of our proposed algorithms.
Fundamental Rotorcraft Acoustic Modeling from Experiments (FRAME) (2011)

A new methodology is developed for the construction of helicopter source noise models for use in mission planning tools from experimental measurements of helicopter external noise radiation. The models are constructed by employing a parameter identification method to an assumed analytical model of the rotor harmonic noise sources. This new method allows for the identification of individual rotor harmonic noise sources and allows them to be characterized in terms of their individual non-dimensional governing parameters. The method is applied to both wind tunnel measurements and ground noise measurements of two-bladed rotors. The method is shown to match the parametric trends of main rotor harmonic noise, allowing accurate estimates of the dominant rotorcraft noise sources to be made for operating conditions based on a small number of measurements taken at different operating conditions. The ability of this method to estimate changes in noise radiation due to changes in ambient conditions is also demonstrated.
Ultrasound Confidence Maps Of Intensity And Structure Based On Directed Acyclic Graphs And Artifact Models (2021)

Ultrasound imaging has been improving, but continues to suffer from inherent artifacts that are challenging to model, such as attenuation, shadowing, diffraction, speckle, etc. These artifacts can potentially confuse image analysis algorithms unless an attempt is made to assess the certainty of individual pixel values. Our novel confidence algorithms analyze pixel values using a directed acyclic graph based on acoustic physical properties of ultrasound imaging. We demonstrate unique capabilities of our approach and compare it against previous confidence-measurement algorithms for shadow-detection and image-compounding tasks.
Human tripartite motif protein 52 is required for cell context-dependent proliferation (2018)

Tripartite motif (TRIM) proteins have been shown to play important roles in cancer development and progression by modulating cell proliferation or resistance from cell death during non-homeostatic stress conditions found in tumor micro-environments. In this study, we set out to investigate the importance for cellular fitness of the virtually uncharacterized family member TRIM52. The human <i>TRIM52</i> gene has arisen recently in evolution, making it unlikely that TRIM52 is required for basic cellular functions in normal cells. However, a recent genome-wide ablation screening study has suggested that TRIM52 may be essential for optimal proliferation or survival in certain genetic cancer backgrounds. Identifying genes which fit this concept of genetic context-dependent fitness in cancer cells is of interest as they are promising targets for tumor-specific therapy. We report here that <i>TRIM52</i> ablation significantly diminished the proliferation of specific glioblastoma cell lines in cell culture and mouse xenografts by compromising their cell cycle progression in a p53-dependent manner. Together, our findings point to a non-redundant TRIM52 function that is required for optimal proliferation.
A topaz international program overview (1995)

Five years ago, during the 8th Symposium on Space Nuclear Power Systems, in Albuquerque, NM, Academician Nikolai Nikolaevich Ponomarev‐Stepnoi, First Deputy Director of the Russian Research Center, Kurchatov Institute, proposed the sale of the Soviety Union’s TOPAZ II technology to the United States. This proposal, made at great personal risk, was initially viewed with much skepticism by most Americans attending that conference since the Cold War was still in full swing. There were, however, a few visionaries, some would say fanatics, that set about to make this sale possible. Even these visionaries did not anticipate the collapse of the Soviet Union or the subsequent efforts by the U.S. and other Western powers to help the Newly Independent States transition to a market economy.Little did these visionaries know that the formation of the ‘‘TOPAZ II Program,’’ using former military space power technology of the Soviet Union, would become the preeminent example of technology cooperation between two former adversaries. A unique teaming arrangement formed in New Mexico, called the New Mexico Strategic Alliance and consisting of the Air Force Phillips Laboratory, Sandia National Laboratories, the University of New Mexico, and Los Alamos Nationalo Laboratory, was a key ingredient in making this program a success. A brief summary of some of the highlights of this technology partnership is given to explain how international patnerships of this type can enable commercialization and technology transfer.
Protection of consumer data in the smart grid compliant with the German smart metering guideline (2013)

Smart metering systems obtain fine-grained consumption data of their users. This allows for effective load balancing, but at the same time threatens consumers' privacy. Since the electricity provider only needs the characteristics of a region, not individuals, approaches like one by Mármol et al. suggest to aggregate data to protect consumer privacy. However, an implementation of such an approach also has to consider the legal and regulatory situation. In Germany, the technical guideline TR-03109 issued by the Federal Office for Information Security specifies demands which have to be fulfilled so that a smart meter gateway can be certified for use. These specifications imply limitations to the protocol design. Within this paper, we discuss the applicability of the method presented by Mármol et al. under consideration of the German Smart Metering guideline. Where conformity is not given, we offer a solution to overcome these restrictions by adapting their method and introduce a third party aggregator who does not have to be trusted. Our method comes with additional communication effort but behaves well in terms of memory and computational overhead. The achieved privacy level outreaches a purely pseudonymous value transmission. Also it does not contradict the postulations of TR-03109, making it an applicable choice for privacy protection in real-world smart metering systems.
Implantation of balloon-expandable intravascular grafts by catheterization in pulmonary arteries and systemic veins. (1988)

The purpose of this investigation was to evaluate the efficacy and safety of implanting expandable intravascular stents in pulmonary arteries and systemic veins. Twenty-seven balloon-expandable grafts were placed in 13 mongrel dogs under anesthesia. A long sheath was introduced over a wire and catheter or dilator into the pulmonary artery or target vein. A collapsed stainless steel expandable mesh stent was placed over the balloon of an angioplasty catheter. The catheter with the mounted stent was advanced through the sheath. The stent expanded to the diameter of the balloon as the balloon was inflated, and remained expanded as the balloon was deflated. The stent was expanded further with a larger balloon in 11 instances. Eleven stents were placed successfully in pulmonary arteries (out of thirteen attempted), and 11 of 14 were installed in tributaries of the precava or postcava. Three inadvertent embolizations of the devices occurred. All three devices that embolized lodged in the pulmonary arteries and did not obstruct flow. Seven dogs were recatheterized at intervals ranging from 56 to 278 days. Twelve stents were patent and nonobstructive, and two were malpositioned, one of which was obstructed. Three animals were killed 2 months (two dogs) and 9 months (one dog) after the implantations. The stents (four in the pulmonary arteries and two in veins) were completely covered with neointima and were patent, without thrombosis. These stents hold promise for definitive dilation of congenital or postoperative vessel stenoses.
Sulfated polysaccharides increase plasma levels of SDF-1 in monkeys and mice: involvement in mobilization of stem/progenitor cells (2002)

It was previously reported that treatment with the sulfated polysaccharide fucoidan or the structurally similar dextran sulfate increased circulating mature white blood cells and hematopoietic progenitor/stem cells (HPCs) in mice and nonhuman primates; however, the mechanism mediating these effects was unclear. It is reported here that plasma concentrations of the highly potent chemoattractant stromal-derived factor 1 (SDF-1) increase rapidly and dramatically after treatment with fucoidan in monkeys and in mice, coinciding with decreased levels in bone marrow. In vitro and in vivo data suggest that the SDF-1 increase is due to its competitive displacement from heparan sulfate proteoglycans that sequester the chemokine on endothelial cell surfaces or extracellular matrix in bone marrow and other tissues. Although moderately increased levels of interleukin-8, MCP1, or MMP9 were also present after fucoidan treatment, studies in gene-ablated mice (GCSFR−/−, MCP1−/−, or MMP9−/−) and the use of metalloprotease inhibitors do not support their involvement in the concurrent mobilization. Instead, SDF-1 increases, uniquely associated with sulfated glycan–mobilizing treatments and not with several other mobilizing agents tested, are likely responsible. To the authors' knowledge, this is the first published report of disrupting the SDF-1 gradient between bone marrow and peripheral blood through a physiologically relevant mechanism, resulting in mobilization with kinetics similar to other mobilizing CXC chemokines. The study further underscores the importance of the biological roles of carbohydrates.
A secure distributed search system (2003)

This paper presents the design, implementation and evaluation of Mingle, a secure distributed search system. Each participating host runs a Mingle server, which maintains an inverted index of the local file system. Users initiate peer-to-peer keyword searches by typing keywords to lightweight Mingle clients. Central to Mingle are its access control mechanisms and its insistence on user convenience. For access control, we introduce the idea of access-right mapping, which provides a convenient way for file owners to specify access permissions. Access control is supported through a single sign-on mechanism that allows users to conveniently establish their identity to Mingle servers, such that subsequent authentication occurs automatically, with minimal manual involvement. Preliminary performance evaluation suggests that Mingle is both feasible and scalable.
Elevated Orai1 expression mediates tumor-promoting intracellular Ca2+ oscillations in human esophageal squamous cell carcinoma (2014)

Effective treatment as well as prognostic biomarker for malignant esophageal squamous cell carcinoma (ESCC) is urgently needed. The present study was aimed at identifying oncogenic genes involving dysregulated intracellular Ca2+ signaling, which is known to function importantly in cellular proliferation and migration. Tumors from patients with ESCC were found to display elevated expression of Orai1, a store-operated Ca2+ entry (SOCE) channel, and the high expression of Orai1 was associated with poor overall and recurrence-free survival. In contrast to the quiescent nature of non-tumorigenic epithelial cells, human ESCC cells exhibited strikingly hyperactive in intracellular Ca2+ oscillations, which were sensitive to treatments with Orai1 channel blockers and to orai1 silencing. Moreover, pharmacologic inhibition of Orai1 activity or reduction of Orai1 expression suppressed proliferation and migration of ESCC in vitro and slowed tumor formation and growth in in vivo xenografted mice. Combined, these findings provide the first evidence to imply Orai1 as a novel biomarker for ESCC prognostic stratification and also highlight Orai1-mediated Ca2+ signaling pathway as a potential target for treatment of this deadly disease.
Pyridoxine and Pyridoxal Analogs. VIII. Synthesis and Infrared Spectra of Metal Chelates (1963)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPyridoxine and Pyridoxal Analogs. VIII. Synthesis and Infrared Spectra of Metal ChelatesDietrich. Heinert and Arthur E. MartellCite this: J. Am. Chem. Soc. 1963, 85, 9, 1334–1337Publication Date (Print):May 1, 1963Publication History Published online1 May 2002Published inissue 1 May 1963https://pubs.acs.org/doi/10.1021/ja00892a026https://doi.org/10.1021/ja00892a026research-articleACS PublicationsRequest reuse permissionsArticle Views137Altmetric-Citations9LEARN 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 Other access optionsGet e-Alertsclose Get e-Alerts
Tracking pereirine and flavopereirine in pau-pereira using Raman and SERS spectroscopies (2019)

Raman and SERS spectroscopies have been used to identify the bioactive compounds pereirine and flavopereirine from stem bark, ethanolic crude extracts and infusions.
Isolation and Identification of Antioxidant Peptides from Jinhua Ham (2013)

The antioxidant activities of the peptides extracted from Jinhua ham were evaluated on the basis of hydroxyl radical scavenging activity, DPPH radical scavenging activity, and Fe(2+) chelating ability. The peptide extracts exhibited great hydroxyl radical scavenging activity and DPPH radical scavenging activity as well as Fe(2+) chelating ability at the concentration of 1 mg/mL, which suggested the presence of peptides with antioxidant activity. The peptides were separated using size exclusion chromatography and reversed-phase HPLC. The fraction with highest DPPH radical scavenging activity was further purified and identified using liquid chromatography tandem matrix-assisted laser desorption/ionization time-of-flight/time-of-flight mass spectrometry (HPLC-MALDI-TOF/TOF-MS). The sequence of the antioxidant peptide was identified as Gly-Lys-Phe-Asn-Val. The assessment of fractions indicated that the hydrophobic fractions contributed more to free radical scavenging activities than the hydrophilic peptides. It was concluded that natural peptides extracted and isolated from the Jinhua ham by several chromatographic techniques have antioxidant activities.
Auxin-Promoted Transport of Metabolites in Stems of Phaseolus vulgaris L. (1976)

i v L) u i iv n v_^ x The proposal that indol-3yl-acetic acid (IAA) regulates acropetal transport in stems by acting along the transport channel was further investigated using decapitated seedlings of Phaseolus vulgaris. Concentrations of two inhibitors of auxin transport, which did not interfere with IAA-promoted basipetal transport, were found to decrease the IAA-promoted component of acropetal metabolite movement. This latter inhibition was relieved by treating the stems with a supplementary supply of IAA below the point of inhibitor application. These observations, together with the finding that the response time of transport to hormone action was strongly dependent on the distance over which IAA needed to move to be present throughout the length of the transport channel, provide support for the above proposed mode of IAA action.
4α-Methyl-5α,14β-ergosta-8,24(241)-dien-3β-ol (“triticusterol”): the first naturally occurring 14β(H)-steroid (1999)

The structure of triticusterol isolated from the germ oil of wheat (Triticum aestivum L.; Gramineae) was established to be 4α-methyl-5α,14β-ergosta-8,24(241)-dien-3β-ol on the basis of spectroscopic data. This is the first example of a naturally occurring compound with a 14β(H)-steroid skeleton.
Stride and cadence as a biometric in automatic person identification and verification (2003)

Presents a correspondence-free method to automatically estimate the spatio-temporal parameters of gait (stride length and cadence) of a walking person from video. Stride and cadence are functions of body height, weight and gender, and we use these biometrics for identification and verification of people. The cadence is estimated using the periodicity of a walking person. Using a calibrated camera system, the stride length is estimated by first tracking the person and estimating their distance travelled over a period of time. By counting the number of steps (again using periodicity) and assuming constant-velocity walking, we are able to estimate the stride to within 1 cm for a typical outdoor surveillance configuration (under certain assumptions). With a database of 17 people and eight samples of each, we show that a person is verified with an equal error rate (EER) of 11%, and correctly identified with a probability of 40%. This method works with low-resolution images of people and is robust to changes in lighting, clothing and tracking errors. It is view-invariant, though performance is optimal in a near-fronto-parallel configuration.
Track-width dependence of transition jitter (1996)

A simple model that represents the microstructure of magnetic medium as a rectangular tesselation predicts that the mean-square jitter is inversely proportional to the track width. We test this prediction using different width heads as well as creating different track widths by partially erasing the original track. We also simulate these experiments using a micromagnetic model. Our experimental and simulation results are found to be in agreement with the prediction.
Nyquist QPSK transmission using rational-function filter for mobile radio (2002)

The design and implementation of a Nyquist QPSK (quadrature phase-shift keying) transmission scheme using a rational-function receiving filter are presented. The scheme is suitable for mobile radios which must be as small as possible and operate with limited power sources. A transitional Butterworth-Thomson (TBT) filter is examined as a rational-function filter, and a ceramic receiving filter is developed with optimum TBT characteristics. pi /4-shifted QPSK transmission experiments using this filter are conducted. The experimental results show that the required input level and cochannel interference are superior by 1 dB to 0.9 dB, respectively, to those of the conventional transmission scheme. The maximum permissive delay spread in frequency-selective fading channels is improved by around 30%.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>
Multidimensional born inversion with a wide-band plane-wave source (1986)

The inverse scattering problem for an acoustic medium is considered within the homogeneous background Born approximation. A constant-density acoustic medium is probed by a wide-band plane-wave source. The scattered field is observed along a receiver array located outside the medium. Two methods for partial reconstruction of the medium velocities are presented. In the first method (the slant-stack method), the projections of the velocity potential at a range of angles are obtained from the plane-wave components of the scattered field. The range of available projection angles is determined by the receiver array aperture and the incidence direction of the probing plane wave. The medium velocities are, then, partially reconstructed from available projections via well-known methods of straight-line tomography. In the second method (the imaging-filtering method), the observed traces are filtered, back-propagated into the medium, and imaged at the source traveltimes, in the same way as in migration. The resulting image is, then, filtered by a linear space-invariant filter to obtain a partial reconstruction of the medium velocities. Both reconstruction methods are illustrated by some synthetic examples for several receiver geometries.
Mechanical Behavior of Particle Filled Elastomers (1999)

Abstract The strong influence of relatively small amounts of filler particles, such as carbon black, on the mechanical properties of elastomers has been well known for decades and has significantly contributed to increased use of elastomeric materials in many commercial applications. Even though the use of fillers is ubiquitous, satisfactory understanding and modeling of the micromechanisms by which fillers alter the mechanical behavior of elastomers has still not been realized. In this work the influence of filler particles on the equilibrium stress-strain response has been investigated. First, an experimental investigation probing the behavior of a chloroprene rubber with varied filler content has been performed. The experimental data allowed for a direct evaluation of both a newly developed constitutive model based on the amplification of the first strain invariant, and a number of other models proposed in the literature. A direct comparison with experimental data suggest that the new model generates superior predictions, particularly for large strain deformations. Then, in an effort to examine some of the assumptions that are common in the constitutive modeling and also to try to determine which of the input parameters are most important, a detailed series of micromechanical models were constructed using two- and three-dimensional finite element simulations. The results indicate that the effect of filler particles on the equilibrium behavior of elastomers can be accurately predicted using stochastic three-dimensional simulations suggesting that successful modeling mainly requires a rigorous treatment of the composite nature of the microstructure and not molecular level concepts such as alteration of mobility or effective crosslinking density in the elastomeric phase of the material.