gebhart/patrepeval huggingface dataset:
A passively mode-locked fiber laser with an enhanced repetition rate characteristic (2002)

Passively mode-locked erbium-doped fiber lasers (EDFLs) have gathered much attention as ultrashort optical pulse sources. Successful demonstrations of generating passively mode-locked pulses shorter than 100 fs of pulse width have been reported by using a figure-8 laser with a nonlinear amplifying loop mirror (NALM) and a ring laser with stretched-pulse additive pulses. One of the most significant disadvantages of the passively mode-locked lasers is that the repetition rate of the output pulses is usually limited to the cavity round trip frequency. In order to overcome this shortcoming of passively mode-locked EDFLs a few schemes, such as ones using a sub-ring cavity and extracavity feedback at linear loop of the figure-8 geometry, were demonstrated. We propose a new passively mode-locked EDFL scheme with a delayed optical path (DOP) coupled to the linear loop of figure-8 laser to enhance the pulse repetition rate.
Bromate Removal from Water Using Doped Iron Nanoparticles on Multiwalled Carbon Nanotubes (CNTS) (2014)

The raw carbon nanotubes (CNTs) were prepared by the floating catalyst chemical vapor deposition method. The raw carbon nanotubes were functionalized, impregnated with iron nanoparticles, and characterized using high resolution transmission electron microscopy (HRTEM), scanning electron microscopy with energy dispersive spectroscopy (SEM‐EDS), Fourier transform infrared spectroscopy (FTIR), Differential Scanning Calorimetry (DSC), and thermogravimetric analysis (TGA). The three types of these multiwalled carbon nanotubes were applied as adsorbents for the removal of bromate from drinking water. The effects of the pH, the concentration of anion, the adsorbent dose, the contact time, and the coanions on the adsorption process have been investigated. The results concluded that the highest adsorption capacities were 0.3460 and 0.3220 mg/g through using CNTs‐Fe and raw CNTs, respectively, at the same conditions. The results showed that the CNTs‐Fe gives higher adsorption capacity compared with the raw CNTs and the functionalized CNTs. The presence of nitrate () in the solution decreases the adsorption capacity of all CNTs compared with chloride (Cl − ) associated with pH adjustment caused by nitric acid or hydrochloric acid, respectively. However, the adsorption of all MWNCTs types increases as the pH of solution decreases.
Tile-Based Rate Assignment for 360-Degree Video Based on Spatio-Temporal Activity Metrics (2018)

Tile-based video systems have recently emerged as a viable solution to overcome the challenges of 360-degree video. For instance, the HEVC based viewport-dependent profile of MPEG OMAF allows serving clients independently coded tiles of the 360-degree video at varying resolution to enhance fidelity within the actual user viewport. During streaming, the client constantly adapts its tile selection and feeds a single merged bitstream to the video decoder. This paper addresses the open issue of rate assignment in a distributed encoding system in such a multi-resolution tiled streaming scenario. A model for tile rate assignment based on the spatio-temporal activity of the video is presented to reduce variance of the quality distribution and experimental results are reported.
X-ray Phase Contrast Imaging with coded apertures for next generation baggage scanning systems (2010)

X-ray Phase Contrast Imaging (XPCi) is a novel method which was proven to enhance the visibility of all details compared to conventional, absorption-based x-ray imaging. Here we propose the application of such a methodology to baggage scanners, a field in which XPCi had not been tested before, and we demonstrate improved detail visibility on a range of samples representing difficult cases in security inspections. A working prototype system has been built, and the results obtained by imaging several test objects mimicking possible components of threat objects. Test objects were also imaged with additional absorbing layers, to show that the method can be used with cluttered environment of baggage in realistic conditions. In all cases, all details were clearly detected with high contrast and high signal-to-noise ratio. Our laboratory-based system uses a conventional X-ray source and a commercially available X-ray detector for data generation. The system can be scaled up by using larger coded apertures.
A Calcium Aluminate Electride Hollow Cathode (2014)

This paper discusses the development and testing of a C12A7 electride hollow cathode. C12A7:e <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-</sup> is a crystalline ceramic in which electrons clathrated in subnanometer sized cages act as a conductive medium. C12A7:e <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-</sup> has a predicted work function of 0.6 eV and hence is of interest in electron emission devices. A 6-mm diameter hollow cathode was fabricated with a C12A7:e <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-</sup> insert and operated for over 50 h on xenon with no signs of degradation. It was successfully started at room temperature without a heater and steady state operating temperatures below 650°C were observed during some tests. In addition, the C12A7:e <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-</sup> cathode was operated on iodine for over 20 h at discharge currents up to 15 A.
Pneumatic Shape-shifting Fingers to Reorient and Grasp (2018)

We present pneumatic shape-shifting fingers to enable a simple parallel-jaw gripper for different manipulation modalities. By changing the finger geometry, the gripper effectively changes the contact type between the fingers and an object to facilitate distinct manipulation primitives. In this paper, we demonstrate the development and application of shape-shifting fingers to reorient and grasp cylindrical objects. The shape of the fingers changes based on the air pressure inside them and attains two distinct geometric forms at high and low pressure values. In our implementation, the finger shape switches between a wedge-shaped geometry and V-shaped geometry at high and low pressure, respectively. Using the wedge-shaped geometry, the fingers provide a point contact on a cylindrical object to pivot it to a vertical pose under the effect of gravity. By changing to V-shaped geometry, the fingers localize the object in the vertical pose and securely hold it. Experimental results show that the smooth transition between the two contact types allows a robot with a simple gripper to reorient a cylindrical object lying horizontally on a ground and to grasp it in a vertical pose.
A near-field bistatic radar cross section calibration method (2007)

The PW scattering-matrix theory, originally introduced by Kerns and Dinallo, enables to evaluate the far-field scattering matrix of a target from a near-field illumination and near-field measurements of the scattered field. It compensates the near-field effects as well as the own characteristics of the near-field setup. The mathematical processing, which is used to evaluate the far-field scattering matrix, has been developed step by step. This mathematical extraction requires planar near-field measurements of the field scattered by the target. It also requires the near-field setup to be calibrated. Two different calibration methods have been developed. The first one is based on a two or three-antenna technique and requires a limited number of measurements. The second one uses bistatic RCS measurements. The PW scattering-matrix theory will now be experimented.
Exploring lung function with hyperpolarized <sup>129</sup>Xe nuclear magnetic resonance (2004)

With the use of polarization-transfer pulse sequences and hyperpolarized (129)Xe NMR, gas exchange in the lung can be measured quantitatively. However, harnessing the inherently high sensitivity of this technique as a tool for exploring lung function requires a fundamental understanding of the xenon gas-exchange and diffusion processes in the lung, and how these may differ between healthy and pathological conditions. Toward this goal, we employed NMR spectroscopy and imaging techniques in animal models to investigate the dependence of the relative xenon gas exchange rate on the inflation level of the lung and the tissue density. The spectroscopic results indicate that gas exchange occurs on a time scale of milliseconds, with an average effective diffusion constant of about 3.3 x 10(-6)cm(2)/s in the lung parenchyma. Polarization-transfer imaging pulse sequences, which were optimized based on the spectroscopic results, detected regionally increased gas-exchange rates in the lung, indicative of increased tissue density secondary to gravitational compression. By exploiting the gas-exchange process in the lung to encode physiologic parameters, these methods may be extended to noninvasive regional assessments of lung-tissue density and the alveolar surface-to-volume ratio, and allow lung pathology to be detected at an earlier stage than is currently possible.
Piezoelectric Properties of (Li, Na, K)NbO<sub>3</sub> Ceramics with Monoclinic System (2011)

The Relationship between the Piezoelectric Properties and Crystal Lattice Deformation and Distortion Resulting from the Li Substitution in Li X Na 0.52 K 0.48- X NbO 3 , Alkaline Niobate-Based Perovskite Ceramics of (Li, Na, K)NbO 3 , Was Investigated. the Lattice Parameters of the Sample with a Li Content X = 0.05 and Having a Monoclinic System with Space Group P M Were a = 3.9789(6) Å, B = 3.9385(5) Å, C = 4.0134(6) Å, and B = 90.305(4)º. the E T 33/e0, Kr, and -D31 Values of the Sample by Poling in the Monoclinic System Were 450, 44.6%, and 57 PC/N, Respectively. on the other Hand, the E T 33/e0, Kr, and -D31 Values of the Sample by Poling in the Tetragonal System Were 600, 38.7%, and 56 PC/N, Respectively. the Remarkable Piezoelectric Properties of these Ceramics Can Be Attributed only to the Low Symmetry of their Monoclinic System, which Is a Subgroup of a Mm2 and P 4mm. Li 0.05 Na 0.52 K 0.43 NbO 3 Ceramics with a Monoclinic System Were Observed to Have the Unique Piezoelectric Characteristics.
Small Molecule Recognition and Tools to Study Modulation of r(CGG)<sup>exp</sup> in Fragile X-Associated Tremor Ataxia Syndrome (2016)

RNA transcripts containing expanded nucleotide repeats cause many incurable diseases via various mechanisms. One such disorder, fragile X-associated tremor ataxia syndrome (FXTAS), is caused by a noncoding r(CGG) repeat expansion (r(CGG)(exp)) that (i) sequesters proteins involved in RNA metabolism in nuclear foci, causing dysregulation of alternative pre-mRNA splicing, and (ii) undergoes repeat associated non-ATG translation (RANT), which produces toxic homopolymeric proteins without using a start codon. Here, we describe the design of two small molecules that inhibit both modes of toxicity and the implementation of various tools to study perturbation of these cellular events. Competitive Chemical Cross Linking and Isolation by Pull Down (C-Chem-CLIP) established that compounds bind r(CGG)(exp) and defined small molecule occupancy of r(CGG)(exp) in cells, the first approach to do so. Using an RNA GFP mimic, r(CGG)(exp)-Spinach2, we observe that our optimal designed compound binds r(CGG)(exp) and affects RNA localization by disrupting preformed RNA foci. These events correlate with an improvement of pre-mRNA splicing defects caused by RNA gain of function. In addition, the compounds reduced levels of toxic homopolymeric proteins formed via RANT. Polysome profiling studies showed that small molecules decreased loading of polysomes onto r(CGG)(exp), explaining decreased translation.
Semantic Profiling: A Method for Relating Auditory Device Signals to Medical Messages (2012)

The present study sought to relate auditory device signals and medical messages based upon shared semantic meaning. Thirty nine Intensive Care Unit (ICU) nurses evaluated thirty auditory signals and thirty written descriptions of medical messages using a common set of Semantic Differential rating scales. Auditory signals and medical messages were clustered based upon shared semantic meaning, which suggested a breakdown of medical messages into seven categories including both patient conditions as well as device information/feedback. Several categories of messages either had no related auditory signals or were related to auditory signals that are not specified in current standards.
Towards hitless reconfiguration in WDM optical networks for ATM transport (2002)

This paper proposes a methodology for reconfiguring a wavelength division multiplexed (WDM) optical network to adapt to changing traffic requirements at the ATM layer. The ATM network layer is reconfigured to adapt to changes in traffic patterns. These changing ATM network topologies or connectivities are known and are used to design the network. The proposed method sizes the ATM switches and then assigns wavelengths between pairs of ports so as to support the required ATM network topologies and their reconfiguration in a hitless manner.
Deconvolution of x-ray phase contrast images as a way to retrieve phase information lost due to insufficient resolution (2009)

When free-space propagation x-ray phase contrast imaging is implemented outside synchrotron radiation facilities, the combined effect of detector resolution and source size swamps the fine phase contrast fringes, often making them almost undetectable. In an attempt to mitigate this effect, a simple deconvolution procedure based on division in the Fourier space plus multiplication by an appropriate filter was applied to experimental x-ray phase contrast images of a simple geometric phantom. The filter parameter was varied in order to assess its impact on the level of retrieved phase signal. The deconvolved images were compared to simulated ones obtained under different resolution conditions, showing that this simple procedure provided signals equivalent to those that would be obtained with a detector with three times better resolution. By accepting an increase in the overall image noise, the method also appears to bring up secondary phase contrast fringes, which are not visible in the unprocessed signal.
Towards Dynamic Surface-Emitting Fiber Lasers (2007)

Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Ofer Shapira, Alexander Stolyarov, Nicholas D. Orf, Ken Kuriki, Ayman F. Abouraddy, John D. Joannopoulos, and Yoel Fink, "Towards Dynamic Surface-Emitting Fiber Lasers," Optics & Photonics News 18(5), 26-31 (2007) Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article
Efficient syntheses for optically pure stereogenically labile 4-substituted-2-hydroxytetronic acids (1990)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEfficient syntheses for optically pure stereogenically labile 4-substituted-2-hydroxytetronic acidsDonald T. Witiak and Ashok K. TehimCite this: J. Org. Chem. 1990, 55, 3, 1112–1114Publication Date (Print):February 1, 1990Publication History Published online1 May 2002Published inissue 1 February 1990https://pubs.acs.org/doi/10.1021/jo00290a059https://doi.org/10.1021/jo00290a059research-articleACS PublicationsRequest reuse permissionsArticle Views162Altmetric-Citations20LEARN 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
Deriving the 12-lead electrocardiogram from four standard leads based on the Frank torso model (2005)

This paper proposes a lead method and a processing means for monitoring the 12-lead electrocardiogram (ECG) with four standard leads. Leads I, II of the M-L leads and leads V1, V6 of the chest leads are used to record the ECG signals. The ECG waveforms of leads V2 through V5 are derived from the input signals using the least squares method based on the Frank torso model. This method makes it possible to monitor the 12-lead ECG during ambulatory and long-term bedside monitoring. Examples recorded in the hospital environment show that the derived ECG waveforms can reproduce main features of the original signals, including the ST segment changes. The advantages of this method are discussed with compared to Dower's EASI ECG.
A Process for Capturing CO2 from the Atmosphere (2018)

(Joule 2, 1573–1594; August 15, 2018) In the originally published version of this article, Table 3 listed values for “Engineering” as $127.0M and $76.2M for “Early Plant” and “Nth Plant” scenarios, respectively. These values have been corrected online to $135.2M and $78.0M to match the engineering study from which Table 3 was drawn. All other values in Table 3 remain unchanged, and the summations are now correct. The authors regret this error. A Process for Capturing CO2 from the AtmosphereKeith et al.JouleJune 7, 2018In BriefFirst direct air capture paper for which all major components are either drawn from well-established commercial heritage or described in sufficient detail to allow assessment by third parties. Includes energy and materials balances, commercial engineering cost breakdown, and pilot plant data. When CO2 is delivered at 15 MPa, the design requires either 8.81 GJ of natural gas, or 5.25 GJ of gas and 366 kWhr of electricity, per ton of CO2 captured. Levelized cost per t-CO2 from atmosphere ranges from 94 to 232 $/t-CO2. Full-Text PDF Open Access
Fabric Phase Sorptive Extraction Explained (2017)

The theory and working principle of fabric phase sorptive extraction (FPSE) is presented. FPSE innovatively integrates the benefits of sol–gel coating technology and the rich surface chemistry of cellulose/polyester/fiberglass fabrics, resulting in a microextraction device with very high sorbent loading in the form of an ultra-thin coating. This porous sorbent coating and the permeable substrate synergistically facilitate fast extraction equilibrium. The flexibility of the FPSE device allows its direct insertion into original, unmodified samples of different origin. Strong chemical bonding between the sol–gel sorbent and the fabric substrate permits the exposure of FPSE devices to any organic solvent for analyte back-extraction/elution. As a representative sorbent, sol–gel poly(ethylene glycol) coating was generated on cellulose substrates. Five (cm2) segments of these coated fabrics were used as the FPSE devices for sample preparation using direct immersion mode. An important class of environmental pollutants—substituted phenols—was used as model compounds to evaluate the extraction performance of FPSE. The high primary contact surface area (PCSA) of the FPSE device and porous structure of the sol–gel coatings resulted in very high sample capacities and incredible extraction sensitivities in a relatively short period of time. Different extraction parameters were evaluated and optimized. The new extraction devices demonstrated part per trillion level detection limits for substitute phenols, a wide range of detection linearity, and good performance reproducibility.
Structure of the 30S ribosomal subunit (2000)

Conference Abstract| October 01 2000 Structure of the 30S ribosomal subunit D. Brodersen; D. Brodersen 1MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, United Kingdom Search for other works by this author on: This Site PubMed Google Scholar A. Carter; A. Carter 1MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, United Kingdom Search for other works by this author on: This Site PubMed Google Scholar W. Clemons, Jr.; W. Clemons, Jr. Search for other works by this author on: This Site PubMed Google Scholar R. Morgan-Warren; R. Morgan-Warren 1MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, United Kingdom Search for other works by this author on: This Site PubMed Google Scholar B. Wimberly; B. Wimberly 1MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, United Kingdom Search for other works by this author on: This Site PubMed Google Scholar V. Ramakrishnan V. Ramakrishnan 1MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, United Kingdom Search for other works by this author on: This Site PubMed Google Scholar Biochem Soc Trans (2000) 28 (5): A103. https://doi.org/10.1042/bst028a103b Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter LinkedIn Cite Icon Cite Get Permissions Citation D. Brodersen, A. Carter, W. Clemons, R. Morgan-Warren, B. Wimberly, V. Ramakrishnan; Structure of the 30S ribosomal subunit. Biochem Soc Trans 1 October 2000; 28 (5): A103. doi: https://doi.org/10.1042/bst028a103b Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentAll JournalsBiochemical Society Transactions Search Advanced Search This content is only available as a PDF. © 2000 Biochemical Society2000 Article PDF first page preview Close Modal You do not currently have access to this content.
Microfabricated heavy metal ion sensor (1995)

A novel microfabricated electrochemical sensor has been developed for the detection and measurement of heavy metal ions in aqueous media. The sensor consists of a silicon substrate, on which is fabricated an electrically interconnected, but diffusionally isolated, array of thin-film iridium microelectrodes upon which a thin film of mercury is electrodeposited. Square-wave anodic-stripping voltammetry is used for quantitative analysis. This method involves an initial preconcentration phase in which the array is held at a cathodic potential such that the metal ions are reduced and amalgamated into the mercury, followed by anodic stripping (re-oxidation) of the metal ions. The charge required to strip a given ionic species completely is proportional to its initial concentration in the test solution. Sensitivity in the parts per billion range has been demonstrated without the addition of supporting electrolytes, deoxygenation, agitation, or any other alterations to the water samples.