4,072 research outputs found
Oblique strategies for ambient journalism
No full textAlfred Hermida recently posited ‘ambient journalism’ as a new framework for para- and professional journalists, who use social networks like Twitter for story sources, and as a news delivery platform. Beginning with this framework, this article explores the following questions: How does Hermida define ‘ambient journalism’ and what is its significance? Are there alternative definitions? What lessons do current platforms provide for the design of future, real-time platforms that ‘ambient journalists’ might use? What lessons does the work of Brian Eno provide–the musician and producer who coined the term ‘ambient music’ over three decades ago?
My aim here is to formulate an alternative definition of ambient journalism that emphasises craft, skills acquisition, and the mental models of professional journalists, which are the foundations more generally for journalism practices. Rather than Hermida’s participatory media context I emphasise ‘institutional adaptiveness’: how journalists and newsrooms in media institutions rely on craft and skills, and how emerging platforms can augment these foundations, rather than replace them
Inhibition of c-steel corrosion by green tea extract in hydrochloric solution
No full textInhibition ability of green tea extract (GTE) on the C38 steel (CS) in 1.0 M HCl was evaluated using different methods such as: weight loss, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) methods at various temperatures. Polarisation curves show that GTE acts essentially as mixed-type inhibitor controlling cathodic and anodic reactions with slight predominant in cathodic branches. EIS results indicate the increase of resistance transfer (Rt) while double layer capacitance (Cdl) decrease in the rise of green tea extract (GTE) concentrations. Obtained results also showed that the inhibition efficiency decreased with a rise in the temperature. Activation energy (Ea), enthalpy (?Ha*) and entropy and (?Sa*) of corrosion process were estimated using experimental measurements
An ENO-Based method for second-order equations and application to the control of dike levels
No full textThis work aims to model the optimal control of dike heights. The control problem leads to so-called Hamilton-Jacobi-Bellman (HJB) variational inequalities, where the dike-increase and reinforcement times act as input quantities to the control problem. The HJB equations are solved numerically with an Essentially Non-Oscillatory (ENO) method. The ENO methodology is originally intended for hyperbolic conservation laws and is extended to deal with diffusion-type problems in this work. The method is applied to the dike optimisation of an island, for both deterministic and stochastic models for the economic growth.Delft Institute of Applied MathematicsElectrical Engineering, Mathematics and Computer Scienc
Immunolocalization of <i>Sm</i>Eno in <i>S</i>. <i>mansoni</i> adult worms and schistosomula.
No full text<p>Indirect immunofluorescent labeling of native <i>Sm</i>Eno protein in sections of (<b>A</b>) an adult male and (<b>B</b>) a whole fixed schistosomulum using polyclonal anti-ENO1 antibody (and secondary anti-rabbit IgG antibody conjugated to Alexa 488 (green)). Enlargements of the areas shown in white boxes in the top row are presented in the middle row. Arrows indicate clear tegumental staining. As a control, secondary antibody alone was used on sections of <b>(C)</b> adult males and <b>(D</b>), whole fixed schistosomula. Scale bars = 100 μm or 50 μm in insets (middle row).</p
Author Correction: Environmental variability supports chimpanzee behavioural diversity
No full textThe original version of the Supplementary Information associated with this Article included an incorrect Supplementary Data 1 file, in which three columns (L, M and P) had slightly different variable names from those written in the code. The HTML has been updated to include a corrected version of Supplementary Data 1; the correct version of Supplementary Data 1 can be found as Supplementary Information associated with this Correction.Additional co-authors: Mattia Bessone, Gregory Brazzola, Valentine Ebua Buh, Rebecca Chancellor, Heather Cohen, Charlotte Coupland, Bryan Curran, Emmanuel Danquah, Tobias Deschner, Dervla Dowd, Manasseh Eno-Nku, J. Michael Fay, Annemarie Goedmakers, Anne-Céline Granjon, Josephine Head, Daniela Hedwig, Veerle Hermans, Sorrel Jones, Jessica Junker, Parag Kadam, Mohamed Kambi, Ivonne Kienast, Deo Kujirakwinja, Kevin E. Langergraber, Juan Lapuente, Bradley Larson, Kevin C. Lee, Vera Leinert, Manuel Llana, Sergio Marrocoli, Amelia C. Meier, David Morgan, Emily Neil, Sonia Nicholl, Emmanuelle Normand, Lucy Jayne Ormsby, Liliana Pacheco, Alex Piel, Jodie Preece, Martha M. Robbins, Aaron Rundus, Crickette Sanz, Volker Sommer, Fiona Stewart, Nikki Tagg, Claudio Tennie, Virginie Vergnes, Adam Welsh, Erin G. Wessling, Jacob Willie, Roman M. Wittig, Yisa Ginath Yuh, Klaus Zuberbühler & Hjalmar S. Küh
New perspectives on segmented crystal calorimeters for future colliders
No full textCrystal calorimeters have a long history of pushing the frontier on high-resolution electromagnetic (EM) calorimetry for photons and electrons. We explore in this paper major innovations in collider detector performance that can be achieved with crystal calorimetry when longitudinal segmentation and dual-readout capabilities are combined with a new high EM resolution approach to Particle Flow in multi-jet events, such as e+e+→ HZ events in all-hadronic final-states at Higgs factories. We demonstrate a new technique for pre-processing π0 momenta through combinatoric di-photon pairing in advance of applying jet algorithms. This procedure significantly reduces π0 photon splitting across jets in multi-jet events. The correct photon-to-jet assignment efficiency improves by a factor of about 3 when the EM resolution is improved from 15 to 3%/√E. In addition, the technique of bremsstrahlung photon recovery significantly improves electron momentum measurements. A high EM resolution calorimeter increases the Z boson recoil mass resolution in Higgstrahlung events for decays into electron pairs to 80% of that for muon pairs. We present the design and optimization of a highly segmented crystal detector concept that achieves the required energy resolution of 3%/√E, and a time resolution better than 30 ps providing exceptional particle identification capabilities. We demonstrate that, contrary to previous detector designs that suffered from large neutral hadron resolution degradation from one interaction length of crystals in front of a sampling hadron calorimeter, the implementation of dual-readout on crystals permits to achieve a resolution better than 30%/√E⊕ 2% for neutral hadrons. Our studies find that the integration of crystal calorimetry into future Higgs factory collider detectors can open new perspectives by yielding the highest level of combined EM and neutral hadron resolution in the PFA paradigm
Photoacoustic signal characterization of cancer treatment response: Correlation with changes in tumor oxygenation
No full textFrequency analysis of the photoacoustic radiofrequency signals and oxygen saturation estimates were used to monitor the in-vivo response of a novel, thermosensitive liposome treatment. The liposome encapsulated doxorubicin (HaT-DOX) releasing it rapidly (<20 s) when the tumor was exposed to mild hyperthermia (43 °C). Photoacoustic imaging (VevoLAZR, 750/850 nm, 40 MHz) of EMT-6 breast cancer tumors was performed 30 min pre- and post-treatment and up to 7 days post-treatment (at 2/5/24 h timepoints). HaT-DOX-treatment responders exhibited on average a 22% drop in oxygen saturation 2 h post-treatment and a decrease (45% at 750 nm and 73% at 850 nm) in the slope of the normalized PA frequency spectra. The spectral slope parameter correlated with treatment-induced hemorrhaging which increased the optical absorber effective size via interstitial red blood cell leakage. Combining frequency analysis and oxygen saturation estimates differentiated treatment responders from non-responders/control animals by probing the treatment-induced structural changes of blood vessel
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D0 search for new phenomena
No full textPresented here are the results from three searches for non-standard model particles using approximately 13 pb{sup {minus}1} of data taken with the D0 detector at Fermilab`s Tevatron, a p{bar p} collider operating at center-of-mass energy {radical}s=1.8 TeV. A heavy right-handed W, predicted by left-right symmetric theories, is excluded at 95% confidence level with mass between 200 GeV/c{sup 2} and 540 GeV/c{sup 2}, for a right-handed neutrino mass less than 100 GeV/c{sup 2}, regardless of the decay-properties of the neutrino, and assuming the W{sub R}`s couplings and C-K-M matrix are the same as the standard model W. Stricter limits are given on the right-handed neutrino mass for W{sub R} masses near the upper limit, and for specific assumptions on the right-handed neutrino decay modes. A 95% confidence-level limit on the cross-section p{bar p} {yields} W{sub 1}Z{sub 2} {yields} 3 leptons, where {sub 1}, is the lightest supersymmetric partner of the charged vector bosom and charged higgs and Z{sub 2} is the second lightest supersymmetric partner of the Z, {gamma}, and neutral higgs, ranging from 3 pb for M{sub w1}, =45 GeV/c{sup 2} to 1 pb for M{sub W1}=100 GeV/c{sup 2} is presented, assuming mass relations between the supersymmetric particles predicted by a popular supergravity inspired model. Third, a 95% confidence-level limit on the mass of the supersymmetric partner of the gluon of 144 GeV/c{sup 2}, if the supersymmetric partner of the quarks are very heavy, or 212 GeV/c{sup 2}, if they have equal masses, is presented within the framework of the same popular model
Temperature performance of a thione quinoxaline compound as mild steel corrosion inhibitor in hydrochloric acid medium
No full textThe inhibiting action of 3-methyl-1-prop-2-ynylquinoxaline-2(1H)-thione (Pr-N-Q=S) on mild steel in molar hydrochloric acid has been investigated in the temperature range from 35 to 80 °C using weight loss measurements. It was shown that the inhibition efficiency increased with Pr-N-Q=S concentration and remained constant and so higher close to 96 % at 10-3M though temperature rising. The apparent activation energies (Ea), enthalpies (ΔH*) and entropies of activation (ΔS*) values provided evidence of the inhibitory effect of Pr-N-Q=S. Langmuir isotherm model fitted well the adsorption of Pr-N-Q=S onto metallic surface in acidic media. Furthermore, spontaneity of the adsorption process, evaluated from the sign of free energy (ΔadsG°) values, showed a decrease upon temperature increase in the
presence of Pr-N-Q=S
Exhaled nitric oxide, serum ECP and airway responsiveness in mild asthmatic children.
No full textThe purpose of the present study was to assess the possible relationships between exhaled nitric oxide (ENO), a circulating marker of eosinophil activation, serum eosinophil cationic protein (SECP), level of airway responsiveness to methacholine and lung function in asthmatic children, as well as to compare these markers between children with and without inhaled steroid therapy. In a cross-sectional study ENO, SECP and bronchial hyperresponsiveness to methacholine were evaluated in a group of 57 asthmatic children (21 without and 36 with regulator inhaled steroid therapy; aged 6-13 yrs). ENO was significantly lower in steroid treated children (p<0.01). No significant differences between steroid treated and untreated children were observed for the provocative concentration of methacholine causing a 20\% fall in forced expiratory volume in one second (FEV1; PC20), SECP and FEV1. In the whole study population significant increase correlations were observed between PC20 and SECP (r=-0.329, p=0.013) and between ENO and FEV1\% of predicted (r=-0.348, p<0.01). In the group not receiving inhaled steroids the inverse relationship between PC20 and SECP was more evident (r=-0.581, p<0.001). In the steroid-treated group a significant inverse relationship was observed between ENO and FEV1 (r=-0.426, p=0.0011). The level of exhaled nitric oxide and the relationships between lung function, bronchial reactivity and markers of inflammation are different between steroid-treated and untreated asthmatic children. This has implications for the monitoring of asthma in childhood
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