gebhart/patrepeval huggingface dataset:
High-productivity seabed time-lapse seismic data acquisition using simultaneous sources enabled by seismic apparition: A synthetic-data study (2016)

Seismic apparition is a recent signal-processing advance that trades signal interference and aliasing between different spatial (and temporal) dimensions. In particular, an important application of seismic apparition is for simultaneous-source separation to better exploit the available data space in the frequency-wavenumber (f-k) domain with energy from different simultaneous sources. The introduction of periodic modulation functions in seismic acquisition produces an effect where parts of the energy of one or more sources are partially shifted to different empty parts within the f-k domain. This so-called apparated energy then can be used to perfectly predict (at low frequencies) the remaining part of the signal in the regions of the f-k domain where the wavefields from the different sources overlap and to deterministically separate the sources at predetermined (repeated) positions — a prerequisite for 4D seismic processing. At higher frequencies, the apparition separation is dealiased using directional information, taking full advantage of the perfect separation at lower frequencies to achieve the required low-error separation. To apparate seismic energy to different portions within the f-k domain, we introduce a periodic modulation function, consisting for instance of a small time delay/advance or an amplitude scaling to every second shot. Our simultaneous-source approach is thus opposite to established industry practices of maximizing randomness using dithered sources. A deterministic simultaneous-source-separation approach in which shot points and simultaneous-source patterns are repeated accurately is a major advantage over industry-standard stochastic simultaneous-source-acquisition approaches, particularly for 4D applications. We demonstrate the suitability of the seismic-apparition simultaneous-source technique to time-lapse seismic, having a permanent-reservoir-monitoring context in mind, by investigating two operational scenarios of single-vessel acquisition where two sources are excited simultaneously. Single-vessel simultaneous-source acquisition represents the most challenging case for shot separation in general and for time-lapse seismic applications in particular. The quantitative and qualitative wavefield decomposition results analyzed pre- and poststack are highly encouraging on synthetic data and warrant further testing of seismic-apparition technology in a real 4D seismic test case.
Crystal Structural and Functional Analysis of the Putative Dipeptidase fromPyrococcus horikoshiiOT3 (2009)

The crystal structure of a putative dipeptidase (Phdpd) from Pyrococcus horikoshii OT3 was solved using X-ray data at 2.4 A resolution. The protein is folded into two distinct entities. The N-terminal domain consists of the general topology of the alpha/beta fold, and the C-terminal domain consists of five long mixed strands, four helices, and two 3(10) helices. The structure of Phdpd is quite similar to reported structures of prolidases from P. furiosus (Zn-Pfprol) and P. horikoshii (Zn-Phdpd), where Zn ions are observed in the active site resulting in an inactive form. However, Phdpd did not contain metals in the crystal structure and showed prolidase activity in the absence of additional Co ions, whereas the specific activities increased by 5 times in the presence of a sufficient concentration (1.2 mM) of Co ions. The substrate specificities (X-Pro) of Phdpd were broad compared with those of Zn-Phdpd in the presence of Co ions, whose relative activities are 10% or less for substrates other than Met-Pro, which is the most favorable substrate. The binding constants of Zn-Phdpd with three metals (Zn, Co, and Mn) were higher than those of Phdpd and that with Zn was higher by greater than 2 orders, which were determined by DSC experiments. From the structural comparison of both forms and the above experimental results, it could be elucidated why the protein with Zn(2+) ions is inactive.
Wideband RFI Cancellation Using true-time delays and a Hadamard Projection Operator (2021)

Radio frequency interference (RFI) in a devastating problem for high-sensitivity phased arrays. This paper explores a method of mitigating RFI in a receiving array using a combination of true-time delay with a truncated Hadamard projection that can place a wide-band spatial null over the RFI. The operations involved can be performed with analog circuity before sampling for the digital signal processing engine in order to enhance dynamic range. The modified beamformer solution is briefly derived and performance is compared to the existing maximum SINR beamformer using analytical phasor domain models. The results show successful null placement at the expense of control of the main lobe shape and side lobe levels.
Picometer-range characterization of LAM dynamics with whole-field LDV (2022)

Large Aperture Mirrors (LAMs) are essential for space telescopes and ground-based observatories. The need exists in characterization of multiple modality dynamics of recently developed LAM’s membrane mirror structure. Knowledge of this dynamics is essential to LAM’s design, balancing and operational efficacy of future systems. This presentation discusses the Whole-Field Laser Doppler Vibrometer (WF-LDV) - the newly developed instrument capable of instant characterization of LAM’s vibrational spectra and full dynamic of its membrane-like mirror surface. WF-LDV allows a picometer-scale accuracy in the multi-kHz frequency band. Innovative WF-LDV design supports measurements of multiple modalities of optical metrology tailored specifically for LAM design.
Formation of an Aza‐nickelacycle by Reaction of an Imine and an Alkyne with Nickel(0): Oxidative Cyclization, Insertion, and Reductive Elimination (2007)

Cyclize, add, reduce: The oxidative cyclization of an imine and an alkyne with nickel(0) followed by the insertion of a second alkyne gives a seven-membered aza-nickelacycle (see scheme). Subsequent reductive elimination yields a 1,2-dihydropyridine. This sequential reaction process is expanded to a one-step nickel-catalyzed [2+2+2] cycloaddition of two alkynes and an imine. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2007/z700688_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
Publisher Correction: Linear motor driven-rotary motion of a membrane-permeabilized ghost in Mycoplasma mobile (2018)

A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has been fixed in the paper.
Structural basis for the docking of mTORC1 on the lysosomal surface (2019)

The mTORC1 (mechanistic target of rapamycin complex 1) protein kinase regulates growth in response to nutrients and growth factors. Nutrients promote its translocation to the lysosomal surface, where its Raptor subunit interacts with the Rag guanosine triphosphatase (GTPase)-Ragulator complex. Nutrients switch the heterodimeric Rag GTPases among four different nucleotide-binding states, only one of which (RagA/B•GTP-RagC/D•GDP) permits mTORC1 association. We used cryo-electron microscopy to determine the structure of the supercomplex of Raptor with Rag-Ragulator at a resolution of 3.2 angstroms. Our findings indicate that the Raptor α-solenoid directly detects the nucleotide state of RagA while the Raptor "claw" threads between the GTPase domains to detect that of RagC. Mutations that disrupted Rag-Raptor binding inhibited mTORC1 lysosomal localization and signaling. By comparison with a structure of mTORC1 bound to its activator Rheb, we developed a model of active mTORC1 docked on the lysosome.
<title>Study of anomalous scatter characteristics</title> (1991)

Anomalous, or non-topographic, scatter from beryllium optics at IR wavelengths has been recognized as a source of poor performance for space based IR imaging systems. This paper reports the results of experiments designed to discover clues as to the source of anomalous scatter so that it can be eliminated with new manufacturing techniques. Polarization, wavelength dependence and surface pitting were examined. None of these can be confirmed as the primary source of anomalous scatter based on the work completed to date.
Standardizing Storage Clusters (2007)

Data-intensive applications such as data mining, movie animation, oil and gas exploration, and weather modeling generate and process huge amounts of data. File-data access throughput is critical for good performance. To scale well, these HPC (high-performance computing) applications distribute their computation among numerous client machines. HPC clusters can range from hundreds to thousands of clients with aggregate I/O demands ranging into the tens of gigabytes per second.
Machine Learning: ECML 2002: 13th European Conference on Machine Learning, Helsinki, Finland, August 19-23, 2002. Proceedings (2002)

Contributed Papers.- Convergent Gradient Ascent in General-Sum Games.- Revising Engineering Models: Combining Computational Discovery with Knowledge.- Variational Extensions to EM and Multinomial PCA.- Learning and Inference for Clause Identification.- An Empirical Study of Encoding Schemes and Search Strategies in Discovering Causal Networks.- Variance Optimized Bagging.- How to Make AdaBoost.M1 Work for Weak Base Classifiers by Changing Only One Line of the Code.- Sparse Online Greedy Support Vector Regression.- Pairwise Classification as an Ensemble Technique.- RIONA: A Classifier Combining Rule Induction and k-NN Method with Automated Selection of Optimal Neighbourhood.- Using Hard Classifiers to Estimate Conditional Class Probabilities.- Evidence that Incremental Delta-Bar-Delta Is an Attribute-Efficient Linear Learner.- Scaling Boosting by Margin-Based Inclusion of Features and Relations.- Multiclass Alternating Decision Trees.- Possibilistic Induction in Decision-Tree Learning.- Improved Smoothing for Probabilistic Suffix Trees Seen as Variable Order Markov Chains.- Collaborative Learning of Term-Based Concepts for Automatic Query Expansion.- Learning to Play a Highly Complex Game from Human Expert Games.- Reliable Classifications with Machine Learning.- Robustness Analyses of Instance-Based Collaborative Recommendation.- iBoost: Boosting Using an instance-Based Exponential Weighting Scheme.- Towards a Simple Clustering Criterion Based on Minimum Length Encoding.- Class Probability Estimation and Cost-Sensitive Classification Decisions.- On-Line Support Vector Machine Regression.- Q-Cut-Dynamic Discovery of Sub-goals in Reinforcement Learning.- A Multistrategy Approach to the Classification of Phases in Business Cycles.- A Robust Boosting Algorithm.- Case Exchange Strategies in Multiagent Learning.- Inductive Confidence Machines for Regression.- Macro-Operators in Multirelational Learning: A Search-Space Reduction Technique.- Propagation of Q-values in Tabular TD(?).- Transductive Confidence Machines for Pattern Recognition.- Characterizing Markov Decision Processes.- Phase Transitions and Stochastic Local Search in k-Term DNF Learning.- Discriminative Clustering: Optimal Contingency Tables by Learning Metrics.- Boosting Density Function Estimators.- Ranking with Predictive Clustering Trees.- Support Vector Machines for Polycategorical Classification.- Learning Classification with Both Labeled and Unlabeled Data.- An Information Geometric Perspective on Active Learning.- Stacking with an Extended Set of Meta-level Attributes and MLR.- Invited Papers.- Finding Hidden Factors Using Independent Component Analysis.- Reasoning with Classifiers.- A Kernel Approach for Learning from almost Orthogonal Patterns.- Learning with Mixture Models: Concepts and Applications.
Antimalarial Activity of N6-Substituted Adenosine Derivatives (Part 2) (2002)

We have investigated the in vitro antimalarial activity of a new series of adenosine derivatives. The results show that N(6)-(1-naphthylmethyl)-5'-deoxy-5'-(amido)adenosines as well as N(6)-(4-phenylbenzyl)-5'-deoxy-5'-(amido)adenosines display significant activity against the malaria-causing parasites, with the sterically demanding bisubstituted species reported being active in most cases in the low-micromolar range. The novel compounds with unusual substitution pattern were obtained applying an efficient convergent polymer-assisted solution-phase (cPASP) synthesis protocol. Thus, we were able to prepare a series of substituted derivatives in parallel that would have been difficult to synthesize by standard techniques. The scope and limitations of the synthetic methodology are discussed.
Alexandrian Cut in Downstream Lignin Valorization to Yield Novel Plasticizers (2023)

ADVERTISEMENT RETURN TO ISSUEPREVFirst ReactionsNEXTAlexandrian Cut in Downstream Lignin Valorization to Yield Novel PlasticizersShannon S. Stahl, Gregg T. Beckham, and co-workers applied benign catalysis on a troublesome substrate to yield valuable compounds of high selectivity with applications in materials science.Maxim V. GalkinMaxim V. GalkinNanotechnology and Functional Materials, Department of Materials Science and Engineering, Ångstrom Laboratory, Uppsala University, 751 21, Uppsala, SwedenMore by Maxim V. Galkinhttps://orcid.org/0000-0001-6543-7674 and Joseph S. M. Samec*Joseph S. M. SamecDepartment of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 106 91 Stockholm, SwedenDepartment of Chemistry, Faculty of Science, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand*Email: [email protected]More by Joseph S. M. Samechttps://orcid.org/0000-0001-8735-5397Cite this: ACS Cent. Sci. 2023, 9, 2, 128–130Publication Date (Web):January 31, 2023Publication History Published online31 January 2023Published inissue 22 February 2023https://doi.org/10.1021/acscentsci.3c00007Copyright © Published 2023 by American Chemical SocietyRIGHTS & PERMISSIONSACS AuthorChoiceCC: Creative CommonsBY: Credit must be given to the creatorArticle Views1085Altmetric-Citations-LEARN 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 InReddit PDF (989 KB) Get e-AlertsSUBJECTS:Aromatic compounds,Biomass,Biopolymers,Organic polymers,Reaction products Get e-Alerts
First observation of Bs0→J/ψf0(980) decays (2011)

Using data collected with the LHCb detector in proton–proton collisions at a centre-of-mass energy of 7 TeV, the hadronic decay Bs0→J/ψf0(980) is observed. This CP eigenstate mode could be used to measure mixing-induced CP violation in the Bs0 system. Using a fit to the π+π− mass spectrum with interfering resonances gives Rf0/ϕ≡Γ(Bs0→J/ψf0,f0→π+π−)Γ(Bs0→J/ψϕ,ϕ→K+K−)=0.252−0.032−0.033+0.046+0.027. In the interval ±90MeV around 980 MeV, corresponding to approximately two full f0 widths we also find R′≡Γ(Bs0→J/ψπ+π−,|m(π+π−)−980MeV|<90MeV)Γ(Bs0→J/ψϕ,ϕ→K+K−)=0.162±0.022±0.016, where in both cases the uncertainties are statistical and systematic, respectively.
Comparison between multiazimuth, wide-azimuth, and full-azimuth towed-streamer acquisition: A full 3D finite-difference study in the Santos Basin (2017)

A seismic modeling study was performed to analyze and compare the illumination and images generated by different acquisition scenarios in a selected area of the pre-salt province of the Santos Basin, offshore Brazil. Using the available data, a realistic earth model was created to carry out 3D ray tracing as well as to generate and migrate finite-difference synthetic shot records. The relative merits of several acquisition designs including narrow-, wide-, and full-azimuth acquisition geometries were considered in this modeling study. This paper describes the modeling experiments and discusses the results. Presentation Date: Monday, September 25, 2017 Start Time: 3:30 PM Location: Exhibit Hall C/D Presentation Type: POSTER
P1–243: The comparison of oligomeric beta‐amyloid and total beta‐amyloid in people with Alzheimer's disease and cognitively normal individuals (2013)

Amyloid-β (Aβ) peptide is the main component of amyloid plaques that is recognized as a neuropathological hallmark of Alzheimer's disease (AD). Studies on total Aβ in plasma as biomarkers for AD have been contradictory. Here, we have compared level of Aβ oligomers as major toxic species of AD, with total Aβ. For evaluation of Aβ oligomers, Multimer Detection System (MDS) was used. In MDS, epitope-overlapping N-terminal Aβ antibodies were used for capturing and detecting of antigen. Using this system, we tested Aβ oligomers in samples from 20 patients with clinically diagnosed AD and 20 healthy normal. For quantitation of total Aβ in samples, a commercially available kit was used. We confirmed A β oligomersdifferentiated AD and healthy normal clearly in comparison to total A β in the samples. On the other hand, data did not show clear difference in concentrations of total A β between healthy normal group and AD patients. In comparison of total A β levels andAβ oligomerslevels between AD patients and healthy normal, our findings show that the level of A β oligomersis more effective in differentiation of AD patients from healthy normal, possibility of serving as a more powerful biomarker for AD diagnosis than total A β in samples.
Regression with Sensor Data Containing Incomplete Observations (2023)

This paper addresses a regression problem in which output label values are the results of sensing the magnitude of a phenomenon. A low value of such labels can mean either that the actual magnitude of the phenomenon was low or that the sensor made an incomplete observation. This leads to a bias toward lower values in labels and the resultant learning because labels may have lower values due to incomplete observations, even if the actual magnitude of the phenomenon was high. Moreover, because an incomplete observation does not provide any tags indicating incompleteness, we cannot eliminate or impute them. To address this issue, we propose a learning algorithm that explicitly models incomplete observations corrupted with an asymmetric noise that always has a negative value. We show that our algorithm is unbiased as if it were learned from uncorrupted data that does not involve incomplete observations. We demonstrate the advantages of our algorithm through numerical experiments.
Structural diversity of multi-component self-assembled systems incorporating p-sulfonatocalix[4]arene (2010)

Bowl shaped p-sulfonatocalix[4]arene is a versatile anion in building multi-component self-assembled materials, with a design strategy of incorporating small organic cations including imidazolium or pyrrolidinium cations within the cavity of the calixarene through their polar head groups, which is also established in solution for the two components. Another design strategy is the assembly of interlocking (embracing) large phosphonium cations around the outer (exo-) surface of the cavity of the calixarene. The selectivity of interplay of the different cations with the endo- and exo-surfaces of the calixarene requires the presence of aquated lanthanide(III) ions, but these ions are not necessarily incorporated into the extended structures.
Grain structure and microtexture in friction stir welded commercial purity titanium (2010)

Defect free friction stir welds were produced in commercial purity titanium at rotational speeds between 200 and 400 rev min –1 . Friction stir welding produced a finer grain structure in the stir zone than in the base material. Electron backscattered diffraction examination suggested that the fine grains in the stir zone were formed through both continuous and discontinuous recrystallisation during friction stir welding. A torsion texture was observed in all welds and occupied most parts of the stir zone. Formation of this texture was attributed to the shear deformation along the tool shoulder during the stirring process.
Severe-to-Fatal Injury Risks in Crashes With Two Front-Seat Occupants by Seat Belt Use (2010)

In crashes with two front occupants, typically one occupant was severely injured, not both. Overall, the odds ratio was 3.28 for one compared to two occupants being severely injured; and, risks vary by seat belt use and seating position. The highest relative risk for unbelted versus belted occupants was 9.22 when both occupants were severely injured in the same crash.
Enhancement of the effect of small anisotropies in magic-angle spinning nuclear magnetic resonance (1988)

A variety of novel methods in magic-angle spinning NMR is described. The effects have in common the enhancement of the influence of small anisotropies on the NMR spectrum by deliberate intervention, i.e. either by applying pulses, carefully chosen continuous r.f. fields, or by adjustment of the spinning speed. It is shown that rotational sidebands in two-dimensional spin-echo NMR are often much larger than in one-dimensional NMR, owing to the interference of the π-pulse with the rotational echo formation. It is also demonstrated that in systems containing heteronuclear spin pairs the application of a weak continuous r.f. field of carefully chosen intensity can reintroduce small heteronuclear couplings into the spectrum. This is known as rotational resonance recoupling and is due to the interference of coherent spin rotations with the normal averaging effect of the sample rotation. Related effects can occur in homonuclear spin systems when an integer multiple of the spinning speed matches the difference between isotropic chemical shifts. In this case no extra r.f. field is necessary to amplify the effect of the non-secular parts of the dipolar interaction. Greatly enhanced polarization exchange as well as strong spectral effects are demonstrated. The application of these novel methods to the measurement of small interaction tensors and thereby to the extraction of important structural information is discussed.
THE INFRARED NUCLEAR EMISSION OF SEYFERT GALAXIES ON PARSEC SCALES: TESTING THE CLUMPY TORUS MODELS (2009)

23 pags. 8 figs., 9 tabs., 1 app.