gebhart/patrepeval huggingface dataset:
A convenient procedure for upgrading commercial (+)- and (-)-.alpha.-pinene to material of high optical purity (1982)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA convenient procedure for upgrading commercial (+)- and (-)-.alpha.-pinene to material of high optical purityHerbert C. Brown, Prabhakar K. Jadhav, and Manoj C. DesaiCite this: J. Org. Chem. 1982, 47, 23, 4583–4584Publication Date (Print):November 1, 1982Publication History Published online1 May 2002Published inissue 1 November 1982https://pubs.acs.org/doi/10.1021/jo00144a037https://doi.org/10.1021/jo00144a037research-articleACS PublicationsRequest reuse permissionsArticle Views447Altmetric-Citations37LEARN 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
Adaptive channel equalization for TDMA digital cellular communications using antenna arrays (2002)

Mobile radio channels can be generally characterized as a fading multipath channel with multipath spread delay that ranges from a few microseconds (/spl mu/s) up to as much as 15 /spl mu/s. Such large delays result in intersymbol interference which raises the need for equalization. A semi-blind maximum likelihood sequence estimation (MLSE) with an antenna array is studied as an adaptive equalization method for time division multiple access (TDMA) digital cellular systems. The MLSE is implemented using a Viterbi algorithm (VA). An antenna array is used to utilize both temporal and spatial structure in the received signal to provide the VA with the estimate of the channel impulse response necessary for it to perform MLSE.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>
Supporting the Scheduling over Local HPC and Cloud Platforms: An FWI Case Study (2015)

Summary Full Waveform Inversion (FWI) is a mathematically and computationally challenging inverse problem of finding a quantitative rock-property description of the subsurface to match observed seismogram data. The inversion employs a forward model, which relates the subsurface to the observed seismograms. FWI and other seismic applications require High Performance Computing (HPC) to simulate the dynamics of such complex models. Not a long ago, companies, research institutes, and universities used to acquire clusters of computers to maintain on-premise. Recently, cloud computing has become an alternative posing a challenge to the end-users, who have to decide whether they should execute their applications: on their local clusters or burst them to a remote cloud provider. In this paper, we present a decision support method to choose the correct environment considering trade-offs, such as resource costs, performance, and availability on such heterogeneous execution platforms. We evaluated the system using our FWI application and preliminary results indicate that users of HPC applications can benefit from such a cloud advisory system to reduce costs, turnaround times, and even boost local platforms.
ChemInform Abstract: INFRARED MATRIX‐ISOLATION STUDIES OF THE INTERACTIONS AND REACTIONS OF GROUP 3A METAL ATOMS WITH WATER (1980)

Abstract A1‐Atome reagieren in einer Ar‐Matrix bei 15 Kmit H 2 O spontan gemäß Reaktionen A und B, während Ga, In und T1 M‐ OH, und M2‐OH2 bilden (Reaktion C, D), die entweder (gilt nur für M: In und Ga) photolytisch auch Spezies des Typs HMOH bilden und bei weiterer Photolyse MOH oder sich im Falle der 2‐atomigenAddukte Mzu‐OH; photolytisch in die H‐verbrückten Spezies M(p‐H,u‐OH)Mumlagern.
Noncovalently Functionalized Dendrimers as Recyclable Catalysts (2001)

The efficient reversible functionalization of the periphery of urea adamantyl poly(propylene imine) dendrimers with catalytic sites using noncovalent interactions is described. Phosphine ligands equipped with urea acetic groups, a binding motive complementary to that of the dendrimer host, have been prepared and assembled to the dendrimer support. The resulting supramolecular complex has been used as a multidentate ligand system in the palladium-catalyzed allylic amination reaction in a batch process and in a continuous-flow membrane reactor. We found that the activity and selectivity of the dendrimeric complex is similar to that of the monomer complex, which indicates that the catalytic centers act as independent sites. The size of the supramolecular system is sufficiently large and the binding of the guests is strong enabling a good separation of the catalyst components from the reaction mixture using nanofiltration techniques.
Evaluation of Ordering in Single-Component and Binary Nanocrystal Superlattices by Analysis of Their Autocorrelation Functions (2011)

Self-assembly of colloidal nanocrystals and other nanosized building blocks has led to numerous large-scale and well-ordered superstructures. To quantify the superlattice quality we present a simple and efficient method, based on analysis of the autocorrelation function to determine characteristic order parameters for short-range and long-range ordering. This provides a feedback for further improvements of deposition techniques and self-assembly processes. To show the power of this method, it is applied to various two-dimensional ordered single component and binary nanocrystal assemblies. A quantitative comparison of the normalized long-range order parameter for various colloidal or epitaxially grown superlattice structures evidences that the long-range ordering in monodisperse colloidal superlattices by far supersedes that obtained at best by epitaxially grown quantum dots. Astonishingly, for selected binary nanocrystal superlattices the long-range ordering parameter reaches almost the same values as for single component superlattices. Besides the high sensitivity of the introduced quantification method to lattice imperfections our analysis also reveals any anisotropy in the ordering of the superlattices, which again can be quantified, for example, to identify the areas of highest quality within one specific sample.
Preprocedural Clinical Parameters Determining Perimitral Conduction Time During Mitral Isthmus Line Ablation (2011)

LA size and AF type significantly influence PMCT in patients undergoing successful MI ablation. These parameters can be used to predict the time value associated with MI block, preprocedurally.
High quality Ge thin film grown by ultrahigh vacuum chemical vapor deposition on GaAs substrate (2011)

High-quality epitaxial Ge films were grown on GaAs substrates by ultrahigh vacuum chemical vapor deposition. High crystallinity and smooth surface were observed for these films by x-ray diffraction, transmission electron microscopy, and atomic force microscopy. Direct band gap emission (1550 nm) from this structure was detected by photoluminescence. Valence band offset of 0.16 eV at the Ge/GaAs interface was measured by x-ray photoelectron spectroscopy. N-type arsenic self-doping of 1018/cm−3 in the grown Ge layers was determined using electrochemical capacitance voltage measurement. This structure can be used to fabricate p-channel metal-oxide-semiconductor field-effect transistor for the integration of Ge p-channel device with GaAs n-channel electronic device.
Elastic Anisotropy Estimation in the North Sea from Walkaway VSP and Sonic Data (2017)

Summary The Hejre oil and gas field is located in the Danish Central Graben, a shallow water part of the central North Sea. The reservoir lies at depths below 5 km in a high-temperature (172°C) and high-pressure (1 kbar) environment. Seismic resolution is relatively poor due to absorption in the overburden, multiples and distortion from a complex structure. Anisotropic depth processing improved the seismic quality but the anisotropy uncertainty remained high. In order to measure elastic anisotropy in-situ, reduce the velocity model uncertainties and allow improvements in anisotropic surface seismic processing, comprehensive Walkaway VSP and modern wireline sonic logging surveys were planned in a new deviated production well drilled in 2016. This project represents a first step in the velocity model calibration workflow and highlights the importance of integrating measurements taken at different scales: cores, sonic, borehole and surface seismic, in order to understand the elastic anisotropy of the rocks drilled and allow reducing the uncertainties in the seismic velocity models used for depth imaging.
Adaptive specle reduction process enhancing structure and texture of B-mode image (2004)

A new adaptive process of B-mode imaging is proposed for easier interpretation of the macroscopic structures of tissues while maintaining the spatial resolution and texture of the original image. The process consists of three steps: extraction of structural components from the image, extraction of texture-like components, and combination of these two components. The structural and texture-like components were extracted using a gray-level concentrative filter and high-pass filter, respectively. Algorithms to minimize the calculation steps of the concentrative were conceived for maintaining the frame rate, and its gray-level bandwidth was adjusted to the statistical speckle parameter of the original image. The clinical B-mode images with and without the proposed process clearly showed its efficacy.
Mexico City's Zócalo (2021)

This book presents a case study of one of Latin America’s most important and symbolic spaces, the Zócalo in Mexico City, weaving together historic events and corresponding morphological changes in the urban environment. It poses questions about how the identity of a place emerges, how it evolves and, why does it change? Mexico City’s Zócalo: A History of a Constructed Spatial Identity utilizes the history of a specific place, the Zócalo (Plaza de la Constitución), to explain the emergence and evolution of Mexican identities over time. Starting from the pre-Hispanic period to present day, the work illustrates how the Zócalo reveals spatial manifestations as part of the larger socio-cultural zeitgeist. By focusing on the history of changes in spatial production – what Henri Lefebvre calls society’s "secretions"&nbsp;– Bross traces how cultural, social, economic, and political forces shaped the Zócalo’s spatial identity and, in turn, how the Zócalo shaped and fostered new identities in return. It will be a fascinating read for architectural and urban historians investigating Latin America.
Back to the future: The human protein index (HPI) and the agenda for post-proteomic biology (2001)

The effort to produce an index of all human proteins (the human protein index, or HPI) began twenty years ago, before the initiation of the human genome program. Because DNA sequencing technology is inherently simpler and more scalable than protein analytical technology, and because the finiteness of genomes invited a spirit of rapid conquest, the notion of genome sequencing has displaced that of protein databases in the minds of most molecular biologists for the last decade. However, now that the human genome sequence is nearing completion, a major realignment is under way that brings proteins back to the center of biological thinking. Using an influx of new and improved protein technologies – from mass spectrometry to re-engineered two-dimensional (2-D) gel systems, the original objectives of the HPI have been expanded and the time frame for its execution radically shortened. Several additional large scale technology efforts flowing from the HPI are also described.
Calcium-Permeable Ion Channels in Pain Signaling (2014)

The detection and processing of painful stimuli in afferent sensory neurons is critically dependent on a wide range of different types of voltage- and ligand-gated ion channels, including sodium, calcium, and TRP channels, to name a few. The functions of these channels include the detection of mechanical and chemical insults, the generation of action potentials and regulation of neuronal firing patterns, the initiation of neurotransmitter release at dorsal horn synapses, and the ensuing activation of spinal cord neurons that project to pain centers in the brain. Long-term changes in ion channel expression and function are thought to contribute to chronic pain states. Many of the channels involved in the afferent pain pathway are permeable to calcium ions, suggesting a role in cell signaling beyond the mere generation of electrical activity. In this article, we provide a broad overview of different calcium-permeable ion channels in the afferent pain pathway and their role in pain pathophysiology.
Cortico‐hippocampal APP and NGF levels are dynamically altered by cholinergic muscarinic antagonist or M1 agonist treatment in normal mice (2002)

To determine whether altered cholinergic neurotransmission can modify the long-term secretion of amyloid precursor protein (APP), endogenous levels of APP and nerve growth factor (NGF), we administered a selective M1 muscarinic receptor agonist (RS86) or the muscarinic antagonist, atropine, for 7 days in vivo into young adult mice (C57BL/6j). The levels of NGF and total APP in the hippocampus, frontal cortex, striatum, parietal cortex and cerebrospinal fluid (CSF) were examined by ELISA and Western blot. We found that this repeated i.m. administration of M1 receptor agonist resulted in decreased total APP levels in the hippocampus, frontal cortex and parietal cortex, and increased secreted alpha-APPs levels in the CSF. M1 agonist treatment also resulted in decreased NGF levels in the hippocampus and CSF. These effects of the M1 muscarinic agonist could be blocked by atropine, which by itself elevated tissue levels of total APP. Interestingly, we found that the decrease of total APP in the hippocampus and striatum after M1 agonist treatment inversely correlated with the change in NGF levels. These data suggest that a sustained increased cholinergic, M1-mediated neurotransmission will enhance secretion of alpha-APPs in CSF and adaptively reduce the levels of total APP and NGF in the corticohippocampal regions of normal mice. The dynamic and adaptive regulation linking total APP and NGF levels in normal adult mice is relevant for understanding the pathophysiology of conditions with cholinergic and APP related pathologies, like Alzheimer's disease and Down's syndrome.
Silicon-on-nitride structures for mid-infrared gap-plasmon waveguiding (2014)

Silicon-on-nitride (SON) is a convenient, low-loss platform for mid-infrared group IV plasmonics and photonics. We have designed 5-layer SON channel-waveguides and slab-waveguides for the 2.0 to 5.4 μm wavelength range and have simulated the resulting three-dimensional (3D) and two-dimensional (2D) SON gap-plasmon modes. Our simulations show propagation lengths of ∼60 μm for 3D gap-strip modes having a 0.003 λ2 cross-section. Because the ∼50-nm SON (Si3N4) mode region is also a gate insulator between silver (Ag) and n-doped Silicon (Si), metal-oxide-semiconductor accumulation gating is available for electro-optical loss modulation of the gap-confined mode.
Agents on the Web (1997)

The authors consider agents on the World Wide Web, including information retrieval agents. They propose a test for agenthood, involving communication in multi-agent systems.
Characterizing the Three-Dimensional Structure of Block Copolymers via Sequential Infiltration Synthesis and Scanning Transmission Electron Tomography (2015)

Understanding and controlling the three-dimensional structure of block copolymer (BCP) thin films is critical for utilizing these materials for sub-20 nm nanopatterning in semiconductor devices, as well as in membranes and solar cell applications. Combining an atomic layer deposition (ALD)-based technique for enhancing the contrast of BCPs in transmission electron microscopy (TEM) together with scanning TEM (STEM) tomography reveals and characterizes the three-dimensional structures of poly(styrene-block-methyl methacrylate) (PS-b-PMMA) thin films with great clarity. Sequential infiltration synthesis (SIS), a block-selective technique for growing inorganic materials in BCPs films in an ALD tool and an emerging technique for enhancing the etch contrast of BCPs, was harnessed to significantly enhance the high-angle scattering from the polar domains of BCP films in the TEM. The power of combining SIS and STEM tomography for three-dimensional (3D) characterization of BCP films was demonstrated with the following cases: self-assembled cylindrical, lamellar, and spherical PS-b-PMMA thin films. In all cases, STEM tomography has revealed 3D structures that were hidden underneath the surface, including (1) the 3D structure of defects in cylindrical and lamellar phases, (2) the nonperpendicular 3D surface of grain boundaries in the cylindrical phase, and (3) the 3D arrangement of spheres in body-centered-cubic (BCC) and hexagonal-closed-pack (HCP) morphologies in the spherical phase. The 3D data of the spherical morphologies was compared to coarse-grained simulations and assisted in validating the simulations' parameters. STEM tomography of SIS-treated BCP films enables the characterization of the exact structure used for pattern transfer and can lead to a better understating of the physics that is utilized in BCP lithography.
High-Resolution Gas-Chromatographic Analysis of the Volatile Constituents of Body Fluids, with Use of Glass Capillary Columns (1974)

Abstract Trace volatile constituents of human urine, serum, and cerebrospinal fluid were concentrated on a porous polymer precolumn, and resolved with high-efficiency glass capillary columns. Thin-film glass columns facilitate effective resolution of underivatized compounds within the volatility range up to docosane in relatively short analysis times. Glass capillary columns coated with stationary phases of different polarity were used. Recorded volatile metabolic profiles of human urine are altered after the sample is treated with β-glucuronidase and sulphatase.
Using Image-space Singular Mode Vectors to Assess the Spatial Resolution of Fluorescence Tomography Instruments (2010)

Detailed singular mode analysis is used to define the spatial resolution of whole-body fluorescence tomography instruments. This proposed methodology provides image-space information that is complementary to singular values.
Effects of Human and Salmon Calcitonin on Human Articular Chondrocytes Cultivated in Clusters* (1989)

The effects of different pharmacological concentrations (0, 5, 10, 100, and 1000 ng/mL) of synthetic human calcitonin (hCT) and salmon calcitonin (sCT) on the incorporation of [3H]thymidine and production of proteoglycans (PG) and type II collagen (coll II) by human articular chondrocytes during a 20-day period were studied in a tridimensional chondrocyte culture model. [3H]Thymidine uptake was measured in chondrocyte clusters, and specific PG and coll II RIAs were performed every 4 days on the culture medium and cell aggregates; total PG and coll II production were also assessed at different culture durations by adding the amounts found in culture media and their corresponding clusters. Incubation with hCT or sCT did not affect [3H]thymidine uptake regardless of the dose. For each culture period, PG and coll II release into culture medium, cluster content, and total production increased significantly in a dose-dependent manner. Cumulative curves for these parameters showed a progressive significant increase with culture duration at hCT and sCT doses of 0, 5, and 10 ng/mL. Cumulative curves obtained with 10, 100, and 1000 ng/mL were seldom significantly different from one another. No differences emerged between the use of hCT or sCT. Thus, CT exerted no proliferative effect on human articular chondrocytes in tridimensional culture, but displayed a dose-dependent and prolonged stimulatory effect on PG and coll II production. CT may possess chondroprotective properties in addition to its other known effects.
Fracture toughness of wood and transparent wood biocomposites in the toughest LT-direction (2023)

Fracture toughness and mechanisms of crack growth are characterized for transparent wood polymer biocomposites and compared to native wood, with the crack normal to the fiber direction (LT fracture plane). Side-grooved specimen geometries generated pure mode I crack growth, whereas previous investigations commonly report 90° crack path deflection. Crack growth micromechanisms were analyzed by experimental fracture tests and in-situ microscopy observations. Large damage zones around the crack tip with fiber bundle bridging and pull-out were observed in the crack wake, justifying more advanced cohesive zone modeling suitable for composite materials design. The polymer matrix resulted in much higher fracture energy of the biocomposites compared to native wood due to increased local cohesive strength. This strength increased from the polymer contribution and more homogeneous stress distribution in the wood fibers.
Calorimetric and optical microscopic studies on one ferroelectric liquid-crystal compound with the smectic-A/emph>phase (1989)

Detailed calorimetric measurements have been carried out on the chiral and racemic versions of one chiral liquid-crystal compound that exhibits an unusual and new smectic-${A}^{\mathrm{*}}$ (Sm-${A}^{\mathrm{*}}$) phase in the pure chiral compound. Both the smectic-A (Sm-A)--smectic-C (Sm-C) transition in the racemic compound and the Sm-${A}^{\mathrm{*}}$--chiral--Sm-C transition in the pure chiral compound display a first-order transition with heat-capacity anomalies qualitatively similar to but quantitatively different from that observed in the ordinary Sm-A--Sm-C transition. Results from optical microscopic studies on the phase diagram of binary mixtures of the dextro and levo versions of the chiral compounds are reported.
Macromol. Rapid Commun. 14/2011 (2011)

Front Cover: The front cover shows that spin-coating a mixture solution of P3HT and PCBM on a cold substrate can increase the power conversion efficiency by 30-40% compared with the solar cells made by the conventional method. The image highlights the spin-coating on a cold substrate and the in situ generated desirable bulk heterojunction (BHJ). Further details can be found in the article by J. Y. Oh, T. I. Lee, J.-M. Myoung, U. Jeong,* and H. K. Baik* on page 1066.