97,242 research outputs found
A METADATA BASED APPROACH FOR ANALYZING UAV DATASETS FOR PHOTOGRAMMETRIC APPLICATIONS
No full textThis paper proposes a methodology for pre-processing and analysing Unmanned Aerial Vehicle (UAV) datasets before photogrammetric processing. In cases where images are gathered without a detailed flight plan and at regular acquisition intervals the datasets can be quite large and be time consuming to process. This paper proposes a method to calculate the image overlap and filter out images to reduce large block sizes and speed up photogrammetric processing. The python-based algorithm that implements this methodology leverages the metadata in each image to determine the end and side overlap of grid-based UAV flights. Utilizing user input, the algorithm filters out images that are unneeded for photogrammetric processing. The result is an algorithm that can speed up photogrammetric processing and provide valuable information to the user about the flight path
Coppered Lives: The Chilean sacrifice zone of Quintero Bay
No full textIn September 1964, when Las Ventanas copper smelter was opened in Quintero Bay it was welcomed as a key piece in the Chilean development strategy. Just over fifty years later, Quintero Bay hosts the largest industrial complex in Chile and has become the site of a chronic environmental disaster, with recurrent pollution crises and industrial accidents that pose massive risks to its human and nonhuman residents. Through historical and ethnographic analysis, involving the use of archival documents, government proceedings, media publications, interviews and participant observation, this thesis investigates Quintero Bay’s process of copper-led industrialisation and its transformation into a sacrifice zone. The thesis explores some of the Chilean government’s environmental regulatory responses, the everyday life of Quintero Bay residents and the emergence of practices of political contestation. The thesis argues that the expectations placed on copper in terms of development, the characteristics and pressures of international copper trade and the adoption of neoclassical calculation regimes have contributed to the emergence and autonomisation of copper’s existential needs. That autonomisation has led to the adoption of a logic of sacrifice that privileges the existential needs of copper over the protection of Quintero Bay’s population and environment. The spatial consequences of that regime has been the production and expansion of a sacrifice zone in Quintero Bay. This study contributes to the understanding of the extended dynamics involved in the production sacrifice zones as spaces of the Anthropocene, illuminating some of the processes of stabilisation, protection and contestation taking place within these spatial formations
Results of the Heart Protection Study: Can we still assume a class effect?
No full textStatins share several common features including the mechanism of action, i.e. inhibition of HMG-CoA reductase, as well as LDL-cholesterol (LDL-C) and triglyceride lowering properties. However, statins show minor differences in chemical structure, lipophilicity that could translate into a different pharmacological properties. For example, simvastatin exerted a more favorable effect on HDL-C levels than did atorvastatin when higher doses of the two drugs were compared. Finally, the major considerations to chose between statins for CVD patient therapy include clinical benefits and safety (i.e. evidence-based medicine). Primary prevention trials with pravastatins and lovastatin and secondary prevention trials with pravastatin, fluvastatin and simvastatin have established the clinical benefits of statins. In addition, HPS study was designed to investigate the benefits of simvastatin 40 mg in a broad range of patients at high risk for heart disease including women, the elderly and those with a history of hearth attacks, diabetes, hypertension or vascular disease. The results show the ability of simvastatin to reduce all causes of mortality, vascular death and cardiovascular morbidity. The trial also confirms the safety of simvastatin 40 mg although 60% of patients were receiving additional pharmacological treatment. In summary, it appears that statins are not the same and the choice of the more appropriate statin in high-risk patients should be driven by the evidence-based medicine both in terms of safety and efficacy
Frigitilla simulatrix F. Smith 1879, comb. nov.
No full textFrigitilla simulatrix (F. Smith, 1879), comb. nov. (Figs 1–5, 14) Mutilla simulatrix F. Smith, 1879: 213. Syntypes, 2 ♀, Brazil, Amazonas, Ega (currently Tefé) (BMNH). Examined by RACT (1990) and DJB (1981). Mutilla frigidula Cresson, 1902: 40. Holotype, ♀, Brazil, Pará, Santarem (CMNH). Examined by DQA (1996). New synonymy. Traumatomutilla simulatrix: Quintero & Cambra 1996: 357. Tobantilla frigidula: Williams et al. 2011: 55. Frigitilla frigidula: Bartholomay et al. 2015: 52. Material examined. Type material. Mutilla simulatrix: lectotype (designated here), ♀, “Type” [typeset circular white label with red border], “Ega // 70 / 16” [handwritten blue circular label], “ Mutilla / simulator [sic] / (Type) Sm ” [handwritten white rectangular label], “B.M. TYPE / HYM. / 15.987.” [typeset and handwritten white rectangular label], “[QR code] / NHMUK010209590” [typeset white rectangular label], “LECTOTYPE / Mutilla simulatrix / Smith, 1879 ♀ / Cambra, Brothers & / Quintero 2016” [typeset red rectangular label] (BMNH); paralectotype, ♀, “Ega // 58 / 6” [handwritten blue circular label], “COMPARED / WITH TYPE / Traumatomutilla / simulatrix / ♀ (Smith) / Mickel / 1931” [typeset and handwritten orange rectangular label], “COMPARED / WITH TYPE / Traumatomutilla / frigidula / ♀ (Cresson) / Mickel / 1931” [typeset and handwritten yellow rectangular label], “[QR code] / NHMUK010209589” [typeset white rectangular label], “PARALECTOTYPE / Mutilla simulatrix / Smith, 1879 ♀ / Cambra, Brothers & / Quintero 2016” [typeset yellow rectangular label] (BMNH). Mutilla frigidula: holotype, ♀, “Santarem”, “TYPE / Cress”, “M. / frigidula / ♀ Cress” [all handwritten labels]. Other material. PERU: Madre de Dios, Reserva Manu, Estación Pakitza, 1–2.vii.1993, R. Cambra, 1♀ (MIUP). BRAZIL: Acre: Senador Guiomard, 10°04'S, 67°36'W, Reserva Catuaba, 5.iii.2002, E. F. Morato, 1♀ (MIUP); same data but: 17.ix.2002, 1♀ (MIUP), 26.xi.2002, 1♂ (MIUP); Rio Branco, 7.iii.1997, E. F. Morato, 1♀ (MIUP); same data but: 6.xii.1995, 1♂ (MIUP), 5.i.1996, 1♂ (MIUP), 8.xi.1996, 1♀ (MIUP); Rio Branco, Bosque Universidad Federal do Acre, 17.ii.1994, D. Quintero, 1♀ (DJBC); Rio Branco, Parque Zoobotanico, 9°15'S, 67°00'W, 2–9.ix.1998 (Malaise), Silva, Selhorst, Reis, 1♂ (MIUP); Amazonas, Lago Amanã, Nov. 1980, R. Best, 1♀ (MIUP). Distribution. Peru (Quintero & Cambra 1996, Rasmussen & Asenjo 2009), Brazil and Bolivia (Williams et al. 2011, Bartholomay et al. 2015). Comments. Smith (1879) gave a size range in his description of M. simulatrix, indicating that he had more than one specimen, but he did not specify a holotype. There are two conspecific and almost identical specimens in the collections of BMNH, both labelled on circular blue labels as from “Ega”; one (Figs 1–4) bears a handwritten label (probably by Smith) indicating it as the “type” of “ Mutilla simulator ” [sic], but the other has no contemporaneous determination label. (The different spelling of the specific name is not unprecedented. For example, the holotype of Mutilla stimulatrix Smith, 1879: 192, from South Africa, bears Smith’s type label as “ Mutilla stimulator ”, the “type” of M. salutatrix Smith, 1879: 227 from Mexico has Smith’s label as “ M. salutator ” and that of M. investigatrix Smith, 1879: 209 from Ega is labelled as “ M. investigator ” (DJB, pers. obs). The types of all of these species are female specimens, so it is possible that the names were changed to the feminine forms for (posthumous) publication, but not on the original labels.) The accession codes associated with the locality labels indicate that both specimens were collected/accessed long before their description and were thus both available to Smith; furthermore, their sizes agree with those given by Smith. It is thus evident that these are the syntypes, and we hereby designate the specimen bearing Smith’s “type” label, and in slightly better condition, as the lectotype. The other specimen is therefore a paralectotype; it bears two labels by Mickel indicating that it was compared with the “types” of both M. simulatrix and M. frigidula in 1931. Mickel had evidently not realized that the two specimens in BMNH were syntypes, but he had recognized the specific synonymy which we have now formally established. Appropriate lectotype and paralectotype labels have been added to these specimens. As reflected above, the holotype of M. frigidula does not bear any labels giving the country, province or collector; those details, listed by Williams et al. (2011), were derived from the introductory material in Cresson’s (1902) paper.Published as part of Cambra, Roberto A., Brothers, Denis J. & Quintero, Diomedes, 2016, Review of Frigitilla Williams in Bartholomay et al., 2015, with description of a new species from Panama (Hymenoptera: Mutillidae), pp. 395-400 in Zootaxa 4189 (2) on pages 396-397, DOI: 10.11646/zootaxa.4189.2.13, http://zenodo.org/record/16597
A Relational Unsupervised Approach to Author Identification
No full textIn the last decades speaking and writing habits have changed.
Many works faced the author identification task by exploiting frequencybased
approaches, numeric techniques or writing style analysis. Following
the last approach we propose a technique for author identification
based on First-Order Logic. Specifically, we translate the complex data
represented by natural language text to complex (relational) patterns
that represent the writing style of an author. Then, we model an author
as the result of clustering the relational descriptions associated to the
sentences. The underlying idea is that such a model can express the typical
way in which an author composes the sentences in his writings. So,
if we can map such writing habits from the unknown-author model to
the known-author model, we can conclude that the author is the same.
Preliminary results are promising and the approach seems viable in real
contexts since it does not need a training phase and performs well also
with short texts
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Outcome of twin–twin transfusion syndrome according to Quintero stage of disease: systematic review and meta-analysis
No full textObjectives: To report the outcome of pregnancies complicated by twin–twin transfusion syndrome (TTTS) according to Quintero stage. Methods: MEDLINE, EMBASE and CINAHL databases were searched for studies reporting the outcome of pregnancies complicated by TTTS stratified according to Quintero stage (I–V). The primary outcome was fetal survival rate according to Quintero stage. Secondary outcomes were gestational age at birth, preterm birth (PTB) before 34, 32 and 28 weeks' gestation and neonatal morbidity. Outcomes are reported according to the different management options (expectant management, laser therapy or amnioreduction) for pregnancies with Stage-I TTTS. Only cases treated with laser therapy were considered for those with Stages-II–IV TTTS and only cases managed expectantly were considered for those with Stage-V TTTS. Random-effects head-to-head meta-analysis was used to analyze the extracted data. Results: Twenty-six studies (2699 twin pregnancies) were included. Overall, 610 (22.6%) pregnancies were diagnosed with Quintero stage-I TTTS, 692 (25.6%) were Stage II, 1146 (42.5%) were Stage III, 247 (9.2%) were Stage IV and four (0.1%) were Stage V. Survival of at least one twin occurred in 86.9% (95% CI, 84.0–89.7%) (456/552) of pregnancies with Stage-I, in 85% (95% CI, 79.1–90.1%) (514/590) of those with Stage-II, in 81.5% (95% CI, 76.6–86.0%) (875/1040) of those with Stage-III, in 82.8% (95% CI, 73.6–90.4%) (172/205) of those with Stage-IV and in 54.6% (95% CI, 24.8–82.6%) (5/9) of those with Stage-V TTTS. The rate of a pregnancy with no survivor was 11.8% (95% CI, 8.4–15.8%) (69/564) in those with Stage-I, 15.0% (95% CI, 9.9–20.9%) (76/590) in those with Stage-II, 18.6% (95% CI, 14.2–23.4%) (165/1040) in those with Stage-III, 17.2% (95% CI, 9.6–26.4%) (33/205) in those with Stage-IV and in 45.4% (95% CI, 17.4–75.2%) (4/9) in those with Stage-V TTTS. Gestational age at birth was similar in pregnancies with Stages-I–III TTTS, and gradually decreased in those with Stages-IV and -V TTTS. Overall, the incidence of PTB and neonatal morbidity increased as the severity of TTTS increased, but data on these two outcomes were limited by the small sample size of the included studies. When stratifying the analysis of pregnancies with Stage-I TTTS according to the type of intervention, the rate of fetal survival of at least one twin was 84.9% (95% CI, 70.4–95.1%) (94/112) in cases managed expectantly, 86.7% (95% CI, 82.6–90.4%) (249/285) in those undergoing laser therapy and 92.2% (95% CI, 84.2–97.6%) (56/60) in those after amnioreduction, while the rate of double survival was 67.9% (95% CI, 57.0–77.9%) (73/108), 69.7% (95% CI, 61.6–77.1%) (203/285) and 80.8% (95% CI, 62.0–94.2%) (49/60), respectively. Conclusions: Overall survival in monochorionic diamniotic pregnancies affected by TTTS is higher for earlier Quintero stages (I and II), but fetal survival rates are moderately high even in those with Stage-III or -IV TTTS when treated with laser therapy. Gestational age at birth was similar in pregnancies with Stages-I–III TTTS, and gradually decreased in those with Stages-IV and -V TTTS treated with laser and expectant management, respectively. In pregnancies affected by Stage-I TTTS, amnioreduction was associated with slightly higher survival compared with laser therapy and expectant management, although these findings may be confirmed only by future head-to-head randomized trials. Copyright © 2020 ISUOG. Published by John Wiley & Sons Ltd
Solitary waves in the nonlinear Dirac equation in the presence of external driving forces
No full textWe consider the nonlinear Dirac (NLD) equation in (1 + 1) dimensions with scalar-scalar self interaction g(2)/k+1 ((psi) over bar psi(k+1) in the presence of external forces as well as damping of the form f (x) - i mu gamma(0)psi, where both f and psi are two-component spinors. We develop an approximate variational approach using collective coordinates (CC) for studying the time dependent response of the solitary waves to these external forces. This approach predicts intrinsic oscillations of the solitary waves, i. e. the amplitude, width and phase all oscillate with the same frequency. The translational motion is also affected, because the soliton position oscillates around a mean trajectory. For k = 1 we solve explicitly the CC equations of the variational approximation for slow moving solitary waves in a constant external force without damping and find reasonable agreement with solving numerically the CC equations. We then compare the results of the variational approximation with no damping with numerical simulations of the NLD equation for k = 1, when the components of the external force are of the form f(j)= r(j) exp(-iKx) and again find agreement if we take into account a certain linear excitation with specific wavenumber that is excited together with the intrinsic oscillations such that the momentum in a transformed NLD equation is conserved.National Natural Science Foundation of China [11471025, 91330110, 11421101]; Alexander von Humboldt Foundation (Germany) through Research Fellowship for Experienced Researchers [SPA 1146358 STP]; MICINN (Spain) [FIS2014-54497-P]; Junta de Andalucia (Spain) [FQM207, P06-FQM-01735, P09-FQM-4643]; Plan Propio of the University of Seville; Department of Atomic Energy, Government of India through a Raja Ramanna FellowshipSCI(E)[email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]
Also By The Same Author: AKTiveAuthor, a Citation Graph Approach to Name Disambiguation
No full textThe desire for definitive data and the semantic web drive for inference over heterogeneous data sources requires co-reference resolution to be performed on those data. In particular, name disambiguation is required to allow accurate publication lists, citation counts and impact measures to be determined. This paper describes a graph-based approach to author disambiguation on large-scale citation networks. Using self-citation, co-authorship and document source analyses, AKTiveAuthor clusters papers, achieving precision of 0.997 and recall of 0.818 over a test group of eight surname clusters
Detection of weak stochastic forces in a parametrically stabilized micro-optomechanical system
No full textMeasuring a weak force is an important task for micromechanical systems, both when using devices as sensitive detectors and, particularly, in experiments of quantum mechanics. The optimal strategy for resolving a weak stochastic signal force on a huge background (typically given by thermal noise) is a crucial and debated topic, and the stability of the mechanical resonance is a further, related critical issue. We introduce and analyze the parametric control of the optical spring, which allows us to stabilize the resonance and provides a phase reference for the oscillator motion, yet conserving a free evolution in one quadrature of the phase space. We also study quantitatively the characteristics of our micro-optomechanical system as detector of stochastic force for short measurement times (for quick, high-resolution monitoring) as well as for the longer-term observations that optimize the sensitivity. We compare a simple strategy based on the evaluation of the variance of the displacement which is a widely used technique) with an optimal Wiener-Kolmogorov data analysis. We show that, due to the parametric stabilization of the effective susceptibility, we can more efficiently implement Wiener filtering, and we investigate how this strategy improves the performance of our system. We finally demonstrate the possibility to resolve stochastic force variations well below 1% of the thermal noise.MicroelectronicsElectrical Engineering, Mathematics and Computer Scienc
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