Miracle-dz/UniFAR-FTUs huggingface dataset:
Oscillations of vertically integrated relativistic tori – I. Axisymmetric modes in a Schwarzschild space–time

This is the first of a series of papers investigating the oscillation properties of relativistic, non-self-gravitating tori orbiting around a black hole. In this initial paper we consider the axisymmetric oscillation modes of a torus constructed in a Schwarzschild space-time. To simplify the treatment and make it as analytical as possible, we build our tori with vertically integrated and vertically averaged quantities, thus transforming the eigenvalue problem into a set of coupled ordinary differential equations. The tori are also modelled with a number of different non-Keplerian distributions of specific angular momentum, and we discuss how the oscillation properties change when different distributions of angular momentum are considered. Our investigation progresses by steps. We first consider a local analysis in Newtonian gravity and determine the properties of acoustic wave propagation within these objects, as well as the relations between acoustic and epicyclic oscillations. Next, we extend the local analysis to a general relativistic framework. Finally, we perform a global analysis and determine both the eigenfunctions and the eigenfrequencies of the axisymmetric oscillations corresponding to the p modes of relativistic tori. These behave as sound waves globally trapped in the torus and possess eigenfrequencies appearing in the simple sequence 2:3:4:. , independently of the distribution of angular momentum considered. The properties of the modes investigated here are in good agreement with those observed in recent numerical simulations, and could have a number of different applications. In X-ray binary systems containing a black hole candidate, for instance, p-mode oscillations could be used to explain the harmonic relations in the high-frequency quasi-periodic oscillations observed. In systems comprising a massive torus orbiting a black hole, on the other hand, p-mode oscillations could be used to explain the development or the suppression of the runaway instability.
Prospective surveillance of sympathetic ophthalmia in the UK and Republic of Ireland

AIMS To establish current epidemiological data, risks, and interventional outcomes of newly diagnosed sympathetic ophthalmia (SO). METHODS Prospective surveillance took place of all permanently employed ophthalmologists in the UK and Republic of Ireland by a monthly reporting card through the British Ophthalmological Surveillance Unit. Case ascertainment was made of newly diagnosed SO from July 1997 and questionnaire data were returned at baseline, 6 months, and 1 year after diagnosis. RESULTS 23 patients with newly diagnosed SO were recruited over 15 months, corresponding to a minimum estimated incidence of 0.03/100 000. Baseline data were available on 18 patients, in whom SO occurred after surgery in 11 patients, after retinal surgery alone in six patients, and after accidental trauma in seven patients. 12 of the 16 patients with 1 year follow up had a visual acuity of 6/12 or better. Good visual outcome was related to prompt and adequate systemic immunosuppressive therapy. CONCLUSIONS The incidence of sympathetic ophthalmia is very low. The main current risk is surgery, particularly retinal surgery, but visual prognosis is good if early diagnosis is made and rapid, adequate immunotherapy is commenced.
WASP-1: a lithium- and metal-rich star with an oversized planet*

In this paper we present our results of a comprehensive spectroscopic analysis of WASP-1, the host star to the exoplanet WASP-1b. We derive Te = 6110 45 K, logg = 4:28 0:15, and [M/H] = 0:23 0:08, and also a high abundance of lithium, logn(Li) = 2:91 0:05. These parameters suggests an age for the system of 1{3 Gyr and a stellar mass of 1.25{1.35 M . This means that WASP-1 has properties very similar to those of HD 149026, the host star for the highest density planet yet detected. Moreover, their planets orbit at comparable distances and receive comparable irradiating uxes from their host stars. However, despite the similarity of WASP-1 with HD 149026, their planets have strongly dierent densities. This suggests that gas-giant planet density is not a simple function of host-star metallicity or of radiation environment at ages of 2 Gyr.
Effect of Modes of Video Presentation of Metacognitive Strategies on Secondary School Students' Achievement in Reading Comprehension in North Central Nigeria

Many senior secondary school students struggle with reading comprehension of expository texts in Nigeria, leading to mass failure in the Senior School Certificate Examinations conducted by the West African Examination Council (WAEC). Research on improving reading comprehension has dwelt on isolated reading strategies taught the learners through the conventional lecture method. No study has explored the effect of video-based training on metacognitive strategies and verbal ability on students’ achievement in reading comprehension. This study, therefore investigated the effect on achievement in reading comprehension of three modes of video instruction in metacognitive strategies of senior secondary school students in North Central zone of Nigeria. It also examined the main and interaction effects of verbal ability level, gender and treatments on achievement in reading comprehension. The study used a quasi-experimental post-test only equivalent group design. Three secondary schools were selected from three States in the North Central geo-political zones in Benue, Nasarawa and Kogi States. In each of the three schools, a total of 120 senior secondary school (SS II) students of both sexes were randomly sampled and assigned to three experimental groups and a control group. The study was guided by five hypotheses which were tested at p
The Relationship of Lexical Richness to the Quality of ESL Learners' Oral Narratives.

This study was an examination of the relationship of lexical richness to the quality of English as a second language (ESL) learners' oral narratives. A computational system was designed to automate the measurement of 3 dimensions of lexical richness, that is, lexical density, sophistication, and variation, using 25 different metrics proposed in the language acquisition literature. This system was used to analyze large-scale data from the Spoken English Corpus of Chinese Learners (Wen, Wang, & Liang, 2005) together with the vocd utility of the Computerized Language Analysis programs (MacWhinney, 2000), which offers an additional measure of lexical variation, the D measure (Malvern, Richards, Chipere, & Duran, 2004; McKee, Malvern, & Richards, 2000). This comprehensive analysis allowed us to identify measures that correlate strongly with the raters' judgments of the quality of ESL learners' oral narratives, as well as to understand the relationships among these measures. This research provides ESL teachers and researchers with a robust tool for assessing the lexical richness of ESL language samples and insights into how lexical richness measures may be effectively used as indices of the quality of ESL learners' speaking task performance. [ABSTRACT FROM AUTHOR]
Conflict-Framed News, Self-Categorization, and Partisan Polarization

Two experiments tested whether exposure to partisan conflict-framed news polarizes news consumers along party lines. Partisan self-categorization and motivated reasoning were examined as potential mediators of this effect. In two samples, path analyses showed that Democrats and Republicans exposed to partisan conflict-framed news adopted more polarized opinions on a disputed issue. This polarization effect was consistently mediated by perceived argument validity, an indicator of motivated reasoning; increased partisan self-categorization also mediated the effect, though less reliably and consistently. Thus, the present study adds to the literature on polarization by providing experimental evidence that exposure to conflict-framed news may contribute to partisan polarization. Theoretical and practical implications are discussed.
Psychological wellbeing and self-esteem in students across the transition between secondary school and university: A longitudinal study

This longitudinal study investigated the psychological wellbeing and self-esteem of students during the transition between secondary school and university. The sample comprised 197 students (82 male; 115 female). The mean age of the students at the start of the study was 18.54 years (SD = 0.78). Students completed measures of psychological wellbeing (Ryff Psychological Wellbeing Scale) and self-esteem (Rosenberg Self-esteem Scale) during their final year of secondary school and again at the start of their university studies. Repeated measures (RM) multivariate analysis of variance (MANOVA) was used to investigate how transition status and gender affected aspects of psychological wellbeing and self-esteem. Multivariate analysis showed main effect of the transition from school to university on psychological wellbeing and self-esteem. Univariate analysis indicated that psychological wellbeing was higher at the start of university studies than during the final year of secondary school, but failed to confirm the effect of the transition on self-esteem. Gender by transition status interactions for two psychological wellbeing dimensions (autonomy and purpose in life) were found.
LOCAL INTERSTELLAR NEUTRAL HYDROGEN SAMPLED IN SITU BY IBEX

Hydrogen gas is the dominant component of the local interstellar medium. However, owing to ionization and interaction with the heliosphere, direct sampling of neutral hydrogen in the inner heliosphere is more difficult than sampling the local interstellar neutral helium, which penetrates deep into the heliosphere. In this paper, we report on the first detailed analysis of the direct sampling of neutral hydrogen from the local interstellar medium. We confirm that the arrival direction of hydrogen is offset from that of the local helium component. We further report the discovery of a variation of the penetrating hydrogen over the first two years of Interstellar Boundary Explorer observations. Observations are consistent with hydrogen experiencing an effective ratio of outward solar radiation pressure to inward gravitational force greater than unity (μ > 1); the temporal change observed in the local interstellar hydrogen flux can be explained with solar variability.
Interference Alignment in Two-Tier Randomly Distributed Heterogeneous Wireless Networks Using Stochastic Geometry Approach

With the massive increase in wireless data traffic in recent years, multi-tier wireless networks have been deployed to provide much higher capacities and coverage. However, heterogeneity of wireless networks bring new challenges for interference analysis and coordination due to spatial randomly distributed transmitters. In this paper, we present a distance-dependent interference alignment (IA) approach for a generic two-tier heterogeneous wireless network, where transmitters in the first and second tiers are distributed as poisson point process (PPP) and poisson cluster process, respectively. The feasibility condition of the IA approach is used to find upper bound of the number of interference streams that can be aligned. The proposed IA scheme maximizes the second-tier throughput by using the tradeoff between signal-to-interference ratio and multiplexing gain. It is shown that acquiring accurate knowledge of the distance between the receiver in the second-tier and the nearest cross-tier transmitter only brings insignificant throughput gain compared with statistical knowledge of distance. Furthermore, the remaining cross-tier and intercluster interferences are modeled and analyzed using stochastic geometry technique. Numerical results validate the derived expressions of success probabilities and throughput, and show that the distance-dependent IA scheme significantly outperforms the traditional IA scheme in the presence of path-loss effect.
How consumers’ use of brand vs attribute information evolves over time

Purpose – Prior research has identified that brands have a differential impact on consumer evaluations across various brand benefits. This paper investigates whether these effects are stable over time, or evolve in a consistent way. Design/methodology/approach – Consumer evaluations of brand benefits into overall brand and detailed attribute-specific sources through a standard confirmatory factor analysis approach have been decomposed. Two unique datasets have been analyzed; the first contains cross-sectional data from Kodak across four different consumer goods categories, and the other is a longitudinal dataset from the USA and Canada in the surface-cleaning category, covering seven brands over five years (2007-2011). Findings – A systematic evolution in brand effects has been demonstrated: a general trend is that over time and with experience, consumers rely more heavily on overall brand information to develop their evaluations. However, early in a brand’s life, or later when circumstances compel consum.
Infrared Fe II Emission in Narrow-Line Seyfert 1 Galaxies

We obtained 0.8-2.4 μm spectra at a resolution of 320 km s-1 of four narrow-line Seyfert 1 galaxies in order to study the near-infrared properties of these objects. We focus on the analysis of the Fe II emission in that region and the kinematics of the low-ionization broad lines. We show that the 1 μm Fe II lines (λ9997, λ10501, λ10863, and λ11126) are the strongest Fe II lines in the observed interval. For the first time, primary cascade lines of Fe II arising from the decay of upper levels pumped by Lyα fluorescence are resolved and identified in active galactic nuclei. Excitation mechanisms leading to the emission of the 1 μm Fe II features are discussed. A combination of Lyα fluorescence and collisional excitation is found to be the main contributor. The flux ratio between near-IR Fe II lines varies from object to object, in contrast to what is observed in the optical region. A good correlation between the 1 μm and optical Fe II emission is found. This suggests that the upper z4F0 and z4D0 levels from which the bulk of the optical Fe II lines descend are mainly populated by the transitions leading to the 1 μm lines. The width and profile shape of Fe II λ11127, Ca II λ8642, and O I λ8446 are very similar but significantly narrower than Paβ, giving strong observational support to the hypothesis that the regions where Fe II, Ca II, and O I are produced are cospatial, interrelated kinematically, and most probably located in the outermost portion of the broad-line region.
Modeling of Eddy Current Loss and temperature of the magnets in Permanent magnet Machines

The eddy current loss in the magnets of permanent magnet (PM) motors in a hybrid electric vehicle (HEV) and plug-in HEV is usually not taken into consideration in traditional motor design and analysis. However, due to the high conductivity of the rare-earth magnet, neodymium-iron-boron (NdFeB), and slot/tooth harmonics, there is eddy current loss generated inside the magnets. This loss may not attribute very much to the efficiency of the motor, but the temperature-rise inside the magnets caused by this loss can lead to the unpredictable deterioration of the magnets, such as the degradation of performance and potential demagnetization. In addition, the output voltage of pulse-width-modulated (PWM) inverter contains abundant high frequency harmonics, which induce excessive loss in the magnets. The excessive heat in PM motor induced by the eddy current loss combined with other losses can degrade the performance of the machine. This paper presents the modeling and analysis of eddy current loss in surface-mounted-magnets PM synchronous motors (SPMSM) and interior-magnets PM synchronous motors (IPMSM), operated by PWM inverter supply. Analytical methods are implemented, in conjunction with time-stepped finite-element analysis (FEA) for the calculation of eddy current loss in the magnet. Based on the calculated losses in the machines, simplified analytical models are developed as thermal circuits with network of interconnected nodes, thermal resistances and heat sources representing the heat processes within the SPMSM and IPMSM, to predict the temperature of the magnets. The predicted machine temperatures are found to be consistent with the experimental measurement.
Cytosolic Phospholipase A2 and Lysophospholipids in Tumor Angiogenesis

Background Lung cancer and glioblastoma multiforme are highly angiogenic and, despite advances in treatment, remain resistant to therapy. Cytosolic phospholipase A2 (cPLA2) activation contributes to treatment resistance through transduction of prosurvival signals. We investigated cPLA2 as a novel molecular target for antiangiogenesis therapy. Methods Glioblastoma (GL261) and Lewis lung carcinoma (LLC) heterotopic tumor models were used to study the effects of cPLA2 expression on tumor growth and vascularity in C57/BL6 mice wild type for (cPLA2α+/+) or deficient in (cPLA2α−/−) cPLA2α, the predominant isoform in endothelium (n = 6–7 mice per group). The effect of inhibiting cPLA2 activity on GL261 and LLC tumor growth was studied in mice treated with the chemical cPLA2 inhibitor 4-[2-[5-chloro-1-(diphenylmethyl)-2-methyl-1H-indol-3-yl]-ethoxy]benzoic acid (CDIBA). Endothelial cell proliferation and function were evaluated by Ki-67 immunofluorescence and migration assays in primary cultures of murine pulmonary microvascular endothelial cells (MPMEC) isolated from cPLA2α+/+ and cPLA2α−/− mice. Proliferation, invasive migration, and tubule formation were assayed in mouse vascular endothelial 3B-11 cells treated with CDIBA. Effects of lysophosphatidylcholine, arachidonic acid, and lysophosphatidic acid (lipid mediators of tumorigenesis and angiogenesis) on proliferation and migration were examined in 3B-11 cells and cPLA2α−/− MPMEC. All statistical tests were two-sided. Results GL261 tumor progression proceeded normally in cPLA2α+/+ mice, whereas no GL261 tumors formed in cPLA2α−/− mice. In the LLC tumor model, spontaneous tumor regression was observed in 50% of cPLA2α−/− mice. Immunohistochemical examination of the remaining tumors from cPLA2α−/− mice revealed attenuated vascularity (P ≤ .001) compared with tumors from cPLA2α+/+ mice. Inhibition of cPLA2 activity by CDIBA resulted in a delay in tumor growth (eg, LLC model: average number of days to reach tumor volume of 700 mm3, CDIBA vs vehicle: 16.8 vs 11.8, difference = 5, 95% confidence interval = 3.6 to 6.4, P = .04) and a decrease in tumor size (eg, GL261 model: mean volume on day 21, CDIBA vs vehicle: 40.1 vs 247.4 mm3, difference = 207.3 mm3, 95% confidence interval = 20.9 to 293.7 mm3, P = .021). cPLA2 deficiency statistically significantly reduced MPMEC proliferation and invasive migration (P = .002 and P = .004, respectively). Compared with untreated cells, cPLA2α−/− MPMEC treated with lysophosphatidylcholine and lysophosphatidic acid displayed increased cell proliferation (P = .011) and invasive migration (P < .001). Conclusions In these mouse models of brain and lung cancer, cPLA2 and lysophospholipids have key regulatory roles in tumor angiogenesis. cPLA2 inhibition may be a novel effective antiangiogenic therapy.
Comparative Assessment of a Self-sampling Device and Gynecologist Sampling for Cytology and HPV DNA Detection in a Rural and Low Resource Setting: Malaysian Experience.

PURPOSE This study was conducted to assess the agreement and differences between cervical self-sampling with a Kato device (KSSD) and gynecologist sampling for Pap cytology and human papillomavirus DNA (HPV DNA) detection. MATERIALS AND METHODS Women underwent self-sampling followed by gynecologist sampling during screening at two primary health clinics. Pap cytology of cervical specimens was evaluated for specimen adequacy, presence of endocervical cells or transformation zone cells and cytological interpretation for cells abnormalities. Cervical specimens were also extracted and tested for HPV DNA detection. Positive HPV smears underwent gene sequencing and HPV genotyping by referring to the online NCBI gene bank. Results were compared between samplings by Kappa agreement and McNemar test. RESULTS For Pap specimen adequacy, KSSD showed 100% agreement with gynecologist sampling but had only 32.3% agreement for presence of endocervical cells. Both sampling showed 100% agreement with only 1 case detected HSIL favouring CIN2 for cytology result. HPV DNA detection showed 86.2%agreement (K=0.64, 95% CI 0.524-0.756, p=0.001) between samplings. KSSD and gynaecologist sampling identified high risk HPV in 17.3% and 23.9% respectively (p= 0.014). CONCLUSION The self-sampling using Kato device can serve as a tool in Pap cytology and HPV DNA detection in low resource settings in Malaysia. Self-sampling devices such as KSSD can be used as an alternative technique to gynaecologist sampling for cervical cancer screening among rural populations in Malaysia.
Neural progenitor cells isolated from the subventricular zone present hemichannel activity and form functional gap junctions with glial cells

The postnatal subventricular zone (SVZ) lining the walls of the lateral ventricles contains neural progenitor cells (NPCs) that generate new olfactory bulb interneurons. Communication via gap junctions between cells in the SVZ is involved in NPC proliferation and in neuroblast migration towards the olfactory bulb. SVZ NPCs can be expanded in vitro in the form of neurospheres that can be used for transplantation purposes after brain injury. We have previously reported that neurosphere-derived NPCs form heterocellular gap junctions with host glial cells when they are implanted after mechanical injury. To analyze functionality of NPC-glial cell gap junctions we performed dye coupling experiments in co-cultures of SVZ NPCs with astrocytes or microglia. Neurosphere-derived cells expressed mRNA for at least the hemichannel/gap junction channel proteins connexin 26 (Cx26), Cx43, Cx45 and pannexin 1 (Panx1). Dye coupling experiments revealed that gap junctional communication occurred among neurosphere cells (incidence of coupling: 100%). Moreover, hemichannel activity was also detected in neurosphere cells as evaluated in time-lapse measurements of ethidium bromide uptake. Heterocellular coupling between NPCs and glial cells was evidenced in co-cultures of neurospheres with astrocytes (incidence of coupling: 91.0 ± 4.7%) or with microglia (incidence of coupling: 71.9 ± 6.7%). Dye coupling in neurospheres and in co-cultures was inhibited by octanol, a gap junction blocker. Altogether, these results suggest the existence of functional hemichannels and gap junction channels in postnatal SVZ neurospheres. In addition, they demonstrate that SVZ-derived NPCs can establish functional gap junctions with astrocytes or microglia. Therefore, cell-cell communication via gap junctions and hemichannels with host glial cells might subserve a role in the functional integration of NPCs after implantation in the damaged brain.
Britain After Brexit: A Nation Divided

On 23 June 2016, the United Kingdom voted by a 52 to 48 margin to leave the European Union. The result of the EU referendum was the latest and most dramatic expression of long-term social changes that have been silently reshaping public opinion, political behavior, and party competition in Britain and Western democracies. In this essay, we consider the underlying social and attitudinal shifts that made “Brexit” and the rise to prominence of the populist, right-wing U.K. Independence Party (UKIP) possible. Finally, we consider what these momentous developments reveal about the state of British politics and society.