bluuebunny/crossref_metadata_2025 huggingface dataset:
Pediatric acute gastroenteritis: understanding caregivers’ experiences and information needs
Authors: Albrecht Lauren , Hartling Lisa , Scott Shannon D.
Published: September 2016

Objectives

Pediatric acute gastroenteritis (AGE) is a common condition with high health care utilization, persistent practice variation, and substantial family burden. An initial approach to resolve these issues is to understand the patient/caregiver experience of this illness. The objective of this study was to describe caregivers’ experiences of pediatric AGE and identify their information needs, preferences, and priorities.

Methods

A qualitative, descriptive study was conducted. Caregivers of a child with AGE were recruited for this study in the pediatric emergency department (ED) at a tertiary hospital in a major urban centre. Individual interviews were conducted (n=15), and a thematic analysis of interview transcripts was completed using a hybrid inductive/deductive approach.

Results

Five major themes were identified and described: 1) caregiver management strategies; 2) reasons for going to the ED; 3) treatment and management of AGE in the ED; 4) caregivers’ information needs; and 5) additional factors influencing caregivers’ experiences and decision-making. A number of subthemes within each major theme were identified and described.

Conclusions

This qualitative descriptive study has identified caregiver information needs, preferences, and priorities regarding pediatric AGE. This study also identified inconsistencies in the treatment and management of pediatric AGE at home and in the ED that influence health care utilization and patient outcomes related to pediatric AGE.
Ondansetron for pediatric concussion; a pilot study for a randomized controlled trial
Authors: Gravel Jocelyn , Carrière Benoit , D’Angelo Antonio , Crevier Louis , Beauchamp Miriam H. , Mâsse Benoît
Published: September 2016

Objectives

Assess the feasibility of a study evaluating one dose of oral ondansetron to decrease post-concussion symptoms at one week and one month following concussion in children aged 8 to 17 years old.

Method

This was a pilot study for a randomized, triple-blind controlled trial of one dose of either ondansetron or placebo performed in a tertiary care pediatric emergency department. Participants were children aged 8 to 17 years who sustained a concussion in the previous 24 hours and visited a single emergency department. The outcome of interest was an increase from pre-concussion baseline of at least 3 symptoms from the Post-Concussion Symptom Inventory, measured at one week and at one month following concussion. The primary outcome was to determine the proportion of children who completed the assessment at one week following the intervention. Secondary outcome was the proportion of children who completed the assessment at one month following the intervention. All children, care givers, and those assessing the outcomes were blinded to the group assignment.

Results

Of the 218 children presenting with a concussion during the study period, we screened 108 and found 36/108 (33%) eligible to participate and 16/108 (14.8%) agreed to participate. All enrolled patients were compliant with the intervention and follow-up.

Conclusion

In our study population, approximately one-third of the screened concussion patients were eligible to participate and approximately one half of those eligible agreed to participate. Our study found that most enrolled patients preferred electronic follow-up; the noncompliance rate was minimal.
Losers’ and Non-voters’ Consent: Democratic Satisfaction in the 2009 and 2013 Elections in Germany
Authors: Rich Timothy , Treece Mallory
Published: September 2016

The literature on losers’ consent identifies clear distinctions in perceptions of democracy between electoral losers and winners. However, little of the literature addresses the complexities of mixed member electoral systems or compares this winner–loser divergence to that of non-voters. An analysis of post-election surveys in Germany in 2009 and 2013 allows for a disaggregation of types of losers and non-voters. Results find that voting for a district candidate from a losing party has a greater effect on perceptions than voting for a losing party in the proportional representation tier, while losing in both appeared to slow the decline in positive evaluations of the system. Meanwhile clear distinctions between perceptions of different types of non-voters emerge.
Vectoring of parallel synthetic jets: a parametric study
Authors: Berk Tim , Gomit Guillaume , Ganapathisubramani Bharathram
Published: September 2016

The vectoring of a pair of parallel synthetic jets can be described using five dimensionless parameters: the aspect ratio of the slots, the Strouhal number, the Reynolds number, the phase difference between the jets and the spacing between the slots. In the present study, the influence of the latter four on the vectoring behaviour of the jets is examined experimentally, using particle image velocimetry. Time-averaged velocity maps are used to give a qualitative description of the variations in vectoring for a parametric sweep of each of the four parameters independently. A diverse set of vectoring behaviour is observed in which the resulting jet can be merged or bifurcated and either vectored towards the actuator leading in phase or the actuator lagging in phase. Three performance metrics are defined to give a quantitative description of the vectoring behaviour: the included angle between bifurcated branches, the vectoring angle of the total flow and the normalized momentum flux of the flow. Using these metrics, the influence of changes in the Strouhal number, Reynolds number, phase difference and spacing are quantified. Phase-locked maps of the swirling strength are used to track vortex pairs. Vortex trajectories are used to define three Strouhal number regimes for the vectoring behaviour. In the first regime, vectoring behaviour is dominated by the pinch-off time, which is written as function of Strouhal number only. In the second regime, the pinch-off time is invariant and the vectoring behaviour slightly changes with Strouhal number. In the third regime, given by the formation criterion, no synthetic jet is formed. Vortex positions at a single phase, shortly after creation of the lagging vortex pair, are used to propose a vectoring mechanism. This vectoring mechanism explains the observed qualitative and quantitative variations for all four parameters.
Effect of turbulence on the wake of a wall-mounted cube
Authors: Hearst R. Jason , Gomit Guillaume , Ganapathisubramani Bharathram
Published: September 2016

The influence of turbulence on the flow around a wall-mounted cube immersed in a turbulent boundary layer is investigated experimentally with particle image velocimetry and hot-wire anemometry. Free-stream turbulence is used to generate turbulent boundary layer profiles where the normalised shear at the cube height is fixed, but the turbulence intensity at the cube height is adjustable. The free-stream turbulence is generated with an active grid and the turbulent boundary layer is formed on an artificial floor in a wind tunnel. The boundary layer development Reynolds number ($Re_{x}$) and the ratio of the cube height ($h$) to the boundary layer thickness ($\unicode[STIX]{x1D6FF}$) are held constant at $Re_{x}=1.8\times 10^{6}$ and $h/\unicode[STIX]{x1D6FF}=0.47$. It is demonstrated that the stagnation point on the upstream side of the cube and the reattachment length in the wake of the cube are independent of the incoming profile for the conditions investigated here. In contrast, the wake length monotonically decreases for increasing turbulence intensity but fixed normalised shear – both quantities measured at the cube height. The wake shortening is a result of heightened turbulence levels promoting wake recovery from high local velocities and the reduction in strength of a dominant shedding frequency.
Surface elevation changes during 2007–13 on Bowdoin and Tugto Glaciers, northwestern Greenland
Authors: TSUTAKI SHUN , SUGIYAMA SHIN , SAKAKIBARA DAIKI , SAWAGAKI TAKANOBU
Published: September 2016

To quantify recent thinning of marine-terminating outlet glaciers in northwestern Greenland, we carried out field and satellite observations near the terminus of Bowdoin Glacier. These data were used to compute the change in surface elevation from 2007 to 2013 and this rate of thinning was then compared with that of the adjacent land-terminating Tugto Glacier. Comparing DEMs of 2007 and 2010 shows that Bowdoin Glacier is thinning more rapidly (4.1 ± 0.3 m a−1) than Tugto Glacier (2.8 ± 0.3 m a−1). The observed negative surface mass-balance accounts for <40% of the elevation change of Bowdoin Glacier, meaning that the thinning of Bowdoin Glacier cannot be attributable to surface melting alone. The ice speed of Bowdoin Glacier increases down-glacier, reaching 457 m a−1 near the calving front. This flow regime causes longitudinal stretching and vertical compression at a rate of −0.04 a−1. It is likely that this dynamically-controlled thinning has been enhanced by the acceleration of the glacier since 2000. Our measurements indicate that ice dynamics indeed play a predominant role in the rapid thinning of Bowdoin Glacier.
A Highly Precise Chronology for the Process of Neolithization in Southern Scandinavia: The ESS Project in Lund, Sweden
Authors: Schulz Paulsson Bettina , Andersson Magnus , Artursson Magnus , Brink Kristian
Published: September 2016

In 2013, one of Sweden’s largest archaeological excavations started in association with the building of the European Spallation Source (ESS) multidisciplinary research center in Lund. The 160 radiocarbon dates that were produced for the project represent the most exhaustive dating program for a Scandinavian site so far and provide evidence for the human impact and activities on the site from the Mesolithic to the Iron Age. This article presents the results within a Bayesian statistical framework for the 70 14C dates from the Early Neolithic settlement (object 1) and a burial site with dolmens and wooden façades. For the first time, a highly precise chronology provides deeper insight into the Neolithization processes and the early settlement strategies in southern Scandinavia from ~3800 cal BC onwards.
The human milk oligosaccharide 2′-fucosyllactose attenuates the severity of experimental necrotising enterocolitis by enhancing mesenteric perfusion in the neonatal intestine
Authors: Good Misty , Sodhi Chhinder P. , Yamaguchi Yukihiro , Jia Hongpeng , Lu Peng , Fulton William B. , Martin Laura Y. , Prindle Thomas , Nino Diego F. , Zhou Qinjie , Ma Congrong , Ozolek John A. , Buck Rachael H. , Goehring Karen C. , Hackam David J.
Published: September 2016

Necrotising enterocolitis (NEC) is a common disease in premature infants characterised by intestinal ischaemia and necrosis. The only effective preventative strategy against NEC is the administration of breast milk, although the protective mechanisms remain unknown. We hypothesise that an abundant human milk oligosaccharide (HMO) in breast milk, 2′-fucosyllactose (2′FL), protects against NEC by enhancing intestinal mucosal blood flow, and we sought to determine the mechanisms underlying this protection. Administration of HMO-2′FL protected against NEC in neonatal wild-type mice, resulted in a decrease in pro-inflammatory markers and preserved the small intestinal mucosal architecture. These protective effects occurred via restoration of intestinal perfusion through up-regulation of the vasodilatory molecule endothelial nitric oxide synthase (eNOS), as administration of HMO-2′FL toeNOS-deficient mice or to mice that received eNOS inhibitors did not protect against NEC, and by 16S analysis HMO-2′FL affected the microbiota of the neonatal mouse gut, although these changes do not seem to be the primary mechanism of protection. Induction of eNOS by HMO-2′FL was also observed in cultured endothelial cells, providing a link between eNOS and HMO in the endothelium. These data demonstrate that HMO-2′FL protects against NEC in part through maintaining mesenteric perfusion via increased eNOS expression, and suggest that the 2′FL found in human milk may be mediating some of the protective benefits of breast milk in the clinical setting against NEC.
ARISTOPHANES’ECCLESIAZVSAEAND THE REMAKING OF THE ΠΑΤΡΙΟΣ ΠΟΛΙΤΕΙΑ
Authors: Sheppard Alan
Published: September 2016

Ecclesiazusae, the first surviving work of Aristophanes from the fourth centuryb.c.e., has often been dismissed as an example of Aristophanes’ declining powers and categorized as being less directly rooted in politics than its fifth-century predecessors owing to the after-effects of Athens’ defeat in the Peloponnesian War. Arguing against this perception, which was largely based on the absence of ad hominem attacks characterizing Aristophanes’ earlier works, this paper explores howEcclesiazusaeengages with contemporary post-war Athenian politics in a manner which, while different to his earlier comedies, remained closely rooted in the political and cultural concerns of the 390s. By examining the figure of Praxagora, I will first consider recent suggestions thatEcclesiazusaehints at the possibility of an anti-democratic coup. I will then examine how contemporary discussions of constitutional and legal reforms (including the invocation of ‘founding fathers’ such as Solon and Lycurgus) are incorporated into both Praxagora's language and the scenes featuring the Selfish Man and Hags that follow the establishment of Praxagora's regime. Examining these final scenes, I conclude thatEcclesiasuzaedoes not suggest that the idea of democratic equality itself is fundamentally flawed, but instead argues that Athens needs a suitable leader, well suited to the rough and tumble of assembly rhetoric, in order to successfully function. In the world ofEcclesiazusae,the men of Athens have failed too often to inspire any hope, putting their own interest above the state, and the new leader must be someone different. Thus Aristophanes sets up Praxagora as a female Solon to remake the state and lead the democracy. The second half of the play demonstrates this need for a strong leader, as problems arise both from the quarter of critical bystanders (the Selfish Man and Epigenes, the Young Man in the ‘hag scene’) and from over-zealous enforcers (the Old Women).
Assessing the diversity, host-specificity and infection patterns of apicomplexan parasites in reptiles from Oman, Arabia
Authors: MAIA JOÃO P. , HARRIS D. JAMES , CARRANZA SALVADOR , GOMÉZ-DÍAZ ELENA
Published: September 2016

Understanding the processes that shape parasite diversification, their distribution and abundance provides valuable information on the dynamics and evolution of disease. In this study, we assessed the diversity, distribution, host-specificity and infection patterns of apicomplexan parasites in amphibians and reptiles from Oman, Arabia. Using a quantitative PCR approach we detected three apicomplexan parasites (haemogregarines, lankesterellids and sarcocystids). A total of 13 haemogregarine haplotypes were identified, which fell into four main clades in a phylogenetic framework. Phylogenetic analysis of six new lankesterellid haplotypes revealed that these parasites were distinct from, but phylogenetically related to, knownLankesterellaspecies and might represent new taxa. The percentage of infected hosts (prevalence) and the number of haemogregarines in the blood (parasitaemia) varied significantly between gecko species. We also found significant differences in parasitaemia between haemogregarine parasite lineages (defined by phylogenetic clustering of haplotypes), suggesting differences in host–parasite compatibility between these lineages. ForPristurus rupestris, we found significant differences in haemogregarine prevalence between geographical areas. Our results suggest that host ecology and host relatedness may influence haemogregarine distributions and, more generally, highlight the importance of screening wild hosts from remote regions to provide new insights into parasite diversity.
Mechanisms of mortality in Culicoides biting midges due to Haemoproteus infection
Authors: BUKAUSKAITĖ DOVILĖ , BERNOTIENĖ RASA , IEZHOVA TATJANA A. , VALKIŪNAS GEDIMINAS
Published: September 2016

We examined the effects of Haemoproteus infection on the survival and pathology caused in the biting midges. Forty-six females of Culicoides impunctatus were exposed experimentally by allowing them to feed on a naturally infected red-backed shrike infected with Haemoproteus lanii (lineage hRB1, gametocytaemia 5·2%). Seventeen females were fed on an uninfected bird (controls). Dead insects were collected, counted and used for dissection, histological examination and polymerase chain reaction-based testing. Parasites were present in all experimentally infected biting midges, but absent from control insects. Survivorship differed significantly between the control and infected groups. Twelve hours post-exposure (PE), 45 (98%) experimentally infected midges were dead, but all control midges remained alive, and many of them survived until 7 day PE. The migrating ookinetes of H. lanii overfilled midgut, markedly damaged the midgut wall, entered the haemocoel and overfilled the abdomen and thorax of exposed biting midges. Massive infection by migrating ookinetes led to damage of abdomen and thorax of biting midges. The parasites often present in large clumps in the haemocoel in abdomen and thorax, leading to the interruption of the haemolymph circulation. These are the main reasons for rapid death of biting midges after feeding on high-intensity infections of Haemoproteus parasites.
Border Anxiety: Culture, Identity and Belonging
Authors: Almond Brenda
Published: September 2016

This paper considers the ethical choices confronting European countries in relation to what has been described as border anxiety. Last year over a million migrants and asylum-seekers crossed European Union borders and the flow has shown no sign of diminishing. This unprecedented movement of people has attracted two main responses. A core issue for both is the Schengen principle of open borders and opinion is split between those who believe that the sheer weight of numbers of would-be migrants requires the reintroduction of strictly controlled frontiers, and those who demand a prompt and sympathetic response to the plight of refugees from war-torn countries. These two positions, however, do not constitute the sum of the moral debate. A broader appraisal of the issues must take account of matters of culture and identity, partiality and preference, and also of some rather more arcane questions about the ethics of ownership, the notion of belonging, and the legitimacy of preferring your ‘own’, whether at a global, national, or personal level. The complexity of this debate and its internal paradoxes throw light on some contemporary concerns about the threat the current situation may pose to Europe's own historic culture and identity.
Do Personal Budgets Increase the Risk of Abuse? Evidence from English National Data
Authors: ISMAIL MOHAMED , HUSSEIN SHEREEN , STEVENS MARTIN , WOOLHAM JOHN , MANTHORPE JILL , ASPINAL FIONA , BAXTER KATE , SAMSI KRITIKA
Published: September 2016

With the continued implementation of the personalisation policy, Personal Budgets (PBs) have moved to the mainstream in adult social care in England. The relationship between the policy goals of personalisation and safeguarding is contentious. Some have argued that PBs have the potential to empower recipients, while others believe PBs, especially Direct Payments, might increase the risk of abuse.

This paper provides empirical evidence about levels of uptake of PBs and safeguarding referrals in England based on in-depth analysis of national data at aggregate, local council level in England, covering 152 Councils. This is complemented by analysis of 2,209 individual referral records obtained from three purposively selected study sites. The aim is to explore whether available data could provide evidence of association between the uptake of PBs and safeguarding referrals. Analysis of the national dataset found no significant relationships between PB uptake and the level and type of alleged abuse. However, analysis of individual-level referral data, from the three selected sites did find some significant associations particularly with financial abuse; and found the main perpetrators of the alleged abuse to be home-care employees. The findings are discussed within the context of current policy and practice.
A Survey of Excavations and Studies on Ostia (2004–2014)
Authors: Pavolini Carlo
Published: September 2016

The paper is a bibliographical and critical survey of the archaeological research on ancient Ostia and Portus in the decade 2004–2014. The first part deals with some general themes, such as cults, architectural typologies and urban history, decoration: wall-paintings, mosaics and marble, the guilds and their seats, trades, etc. The second part is a survey of individual monuments and buildings which have been the subject of recent excavations and interpretations. The critical problem of late antique Ostia is treated separately, as well as the archaeology of Isola Sacra and Portus, with the Imperial harbours.
A 10-year cohort analysis of routine paediatric ART data in a rural South African setting
Authors: LILIAN R. R. , MUTASA B. , RAILTON J. , MONGWE W. , McINTYRE J. A. , STRUTHERS H. E. , PETERS R. P. H.
Published: September 2016

South Africa's paediatric antiretroviral therapy (ART) programme is managed using a monitoring and evaluation tool known as TIER.Net. This electronic system has several advantages over paper-based systems, allowing profiling of the paediatric ART programme over time. We analysed anonymized TIER.Net data for HIV-infected children aged <15 years who had initiated ART in a rural district of South Africa between 2005 and 2014. We performed Kaplan–Meier survival analysis to assess outcomes over time. Records of 5461 children were available for analysis; 3593 (66%) children were retained in care. Losses from the programme were higher in children initiated on treatment in more recent years (P< 0·0001) and in children aged ≤1 year at treatment initiation (P< 0·0001). For children aged <3 years, abacavir was associated with a significantly higher rate of loss from the programme compared to stavudine (hazard ratio 1·9,P< 0·001). Viral load was suppressed in 48–52% of the cohort, with no significant change over the years (P= 0·398). Analysis of TIER.Net data over time provides enhanced insights into the performance of the paediatric ART programme and highlights interventions to improve programme performance.
Bourbon manoeuvres in the plaza: shifting urban models in late colonial Lima
Authors: RAMÓN GABRIEL
Published: September 2016

Most colonial Hispanic American cities were originally planned around a main plaza, which was a multifunctional square crucial for urban life. This spatial model for the whole city based on a main square is termed thePlaza Mayormodel. Bourbon reforms of the second half of the eighteenth century aimed at transforming this model according to aPlaza de Armasorganization. Here, these two models (Plaza MayorandPlaza de Armas) are characterized, and their contradictions in terms of political projects and quotidian city life are analysed. For late colonial Lima, Bourbon efforts to introduce thePlaza de Armasare shown to have affected both the main function of the central square and the entire urban system.
Cytotoxicity of Experimental Resin Composites on Mesenchymal Stem Cells Isolated from Two Oral Sources
Authors: Roman Alexandra , Páll Emöke , Moldovan Mărioara , Rusu Darian , Şoriţău Olga , Feştilă Dana , Lupşe Mihaela
Published: September 2016

Resin composite materials that are used to restore tooth cervical lesions associated with gingival recessions can hamper healing after root coverage surgeries. This study evaluates thein vitrocytotoxic effect of five resin composites (two commercial and three experimental) on oral mesenchymal stem cells (MSCs) and the persistence of stemness properties in high passage MSCs. Sorption and solubility tests were made for all materials. MSCs were isolated from re-entry palatal and periodontal granulation tissues and were characterized and cultured on composite discs. Cytotoxicity of the materials was evaluated by the Alamar Blue viability test, by Paul Karl Horan (PKH) labeling, and by immunocytochemical staining for actin. Water and saliva sorption and solubility data revealed that two of the experimental materials behaved comparable with the marketed resin composites. The Alamar Blue viability test shows that both cell lines grew well on composite discs that seemed to induce no apparent toxic effects. No signs of disruption of cytoskeleton organization was seen. Experimental resin composites can be recommended for further investigation for obtaining approval for use. The standard minimal criteria were fulfilled for high passage MSCs. Palatal tissue regains its regenerative properties in terms of MSC presence in the re-entry area after 6 months of healing.
Development of 3D biological effective dose distribution software program
Authors: Khadsiri Patchareewan , Tharavichitkul Ekkasit , Saekho Suwit , Chawapun Nisa
Published: September 2016

Purpose

To develop a software program to convert physical dose distribution into biological effective dose (BED).

Methods

The MATLAB-based BED distribution software program was designed to import the radiotherapy treatment plan from the computer treatment planning system and to convert the physical dose distribution into the BED distribution. The BED calculation was based on the linear-quadratic-linear model (LQ-L model). Besides radiobiological parameters, other specific data could be fed in through the panel. The accuracy of the program was verified by comparing the BED distribution with manual calculation.

Results

This software program was able to import the radiotherapy treatment plans and pull out pixel-wised physical dose for BED calculation, and display the isoBED lines on the computed tomographic (CT) image. The verification of BED dose distribution was performed in both phantom and clinical cases. It revealed that there were no differences between the program and manual BED calculations.

Conclusion

It is feasible and practical to use this in-house BED distribution software program in clinical practices and research work. However, it should be used with caution as the validity of the program depends on the accuracy of the published biological parameters.
Unilateral vocal cord paralysis in squamous cell lung cancer treated with stereotactic body radiation therapy
Authors: Syed Yusef A. , Ma Sung Jun , Gomez Jorge
Published: September 2016

Aim

We report a unique presentation of a late side effect associated with stereotactic body radiation therapy (SBRT) of the lung.

The case of a 65-year-old male who developed left-sided vocal cord paralysis after two courses of SBRT for squamous cell lung carcinoma is presented. The patient developed this late toxicity 15 months after his second treatment, which was to address a recurrence in the perihilar region of the left upper lobe.
Formative evaluation of practice changes for managing depression within a Shared Care model in primary care
Authors: Beaulac Julie , Edwards Jeanette , Steele Angus
Published: September 2016

Aim

To investigate the implementation and initial impact of the Physician Integrated Network (PIN) mental health indicators, which are specific to screening and managing follow-up for depression, in three primary care practices with Shared Mental Health Care in Manitoba.

Background

Manitoba Health undertook a primary care renewal initiative in 2006 called the PIN, which included the development of mental health indicators specific to screening and managing follow-up for depression. These indicators were implemented in three PIN group practice sites in Manitoba, which are also part of Shared Mental Health Care.

Methods

The design was a non-experimental longitudinal design. A formative evaluation investigated the implementation and initial impact of the mental health indicators using mixed methods (document review, survey, and interview). Quantitative data was explored using descriptive and comparative statistics and a content and theme analysis of the qualitative interviews was conducted. Survey responses were received from 32 out of 36 physicians from the three sites. Interviews were conducted with 15 providers.

Findings

This evaluation illustrated providers’ perceived attitudes, knowledge, skills, and behaviours related to recognizing and treating depression and expanded our understanding of primary care processes related to managing depression related to the implementation of a new initiative. Depression is viewed as an important problem in primary care practice that is time consuming to diagnose, manage and treat and requires further investigation. Implementation of the PIN mental health indicators was variable across sites and providers. There was an increase in use of the indicators across time and a general sentiment that benefits of screening outweigh the costs; however, the benefit of screening for depression remains unclear. Consistent with current guidelines, a question the findings of this evaluation suggests is whether there are more effective ways of having an impact on depression within primary care than screening.
Flare stars across the H-R diagram: a clue to the origin of the corona
Authors: Balona L. A.
Published: September 2016

Kepler observations show that starspots and superflares are present in A stars. An analysis of Kepler short-cadence data shows that the relative number of A/F flare stars is only a factor of four smaller than K/M flare stars, which can be explained as a selection effect. The average maximum flare amplitude does not depend much on spectral type, which is to be expected if the size of the active region scales in proportion to the stellar radius. The presence of starspots and superflares in A stars suggests that these stars have magnetic fields. However, X-ray observations show that A stars do not possess coronae. I therefore conclude that convection in the stellar envelope is a necessary condition for the formation of the corona. A magnetic field may be necessary to enable coronal heating.
On the origin of solar and stellar flares
Authors: Ibadov Subhon , Ibodov Firuz S.
Published: September 2016

Solar and stellar flares due to impacts of comet nuclei and falling evaporating bodies, FEBs, with the Sun/stars are analytically considered. It is shown that impacts of sun/stargrazing comets will be accompanied by essential aerodynamic effects: nuclei crushing and expansion/ flattening of crushed mass within the chromosphere. These processes lead to impulse generation of a hot plasma, strong shock wave in the thin layer near photosphere, eruption of the hot ionized clump to the lower corona, i.e., impact-induced solar/stellar flares.
Statistical properties of superflares on solar-type stars based on the Kepler 1-min cadence data
Authors: Maehara Hiroyuki , Shibayama Takuya , Notsu Yuta , Notsu Shota , Honda Satoshi , Nogami Daisaku , Shibata Kazunari
Published: September 2016

We searched for superflares on solar-type stars using the Kepler short-cadence (1-min sampling) data in order to detect superflares with short duration. We found 187 superflares on 23 solar-type stars whose bolometric energy ranges from the order of 1032 erg to 1036 erg. Using these new data combined with the results from the data with 30-min sampling, we found the occurrence frequency (dN/dE) of superflares as a function of flare energy (E) shows the power-law distribution (dN/dE ∝ E−α) with α=1.5 for 1033 < E < 1036 erg. The upper limit of energy released by superflares is basically comparable to a fraction of the magnetic energy stored near starspots which is estimated from the amplitude of brightness variations. We also found that the duration of superflares (τ) increases with the flare energy (E) as τ ∝ E0.39±0.03. This can be explained if we assume the time-scale of flares is determined by the Alfvén time.
The estimate of hot Jupiter mass loss rate in the interaction with CME from a solar type star
Authors: Bisikalo Dmitry V. , Cherenkov Alexander A. , Kaygorodov Pavel V.
Published: September 2016

We consider the influence of a coronal mass ejection (CME) of a solar type star on the mass loss rate of a hot Jupiter exoplanet. We have conducted 3D numerical gas-dynamic simulations of the planet's atmosphere that interacts with CME. Using the results of these simulations we have estimated the specific parameters that influence the mass loss rate. Based on the assumption that CME totally sweeps away part of the planet's gaseous envelope located outside the Roche lobe we estimated the maximum mass loss rate. Finally, we have considered the dependence of mass loss rate on the frequency of CMEs in course of star's evolution.
The Reflecting Heliometer of Rio de Janeiro after 6 years of activity
Authors: Boscardin S. C. , Sigismondi C. , Penna J. L. , D'Avila V. , Reis-Neto E. , Andrei A.H.
Published: September 2016

Started its regular, daily operational phase in 2011, by the occasion of the Symp264 in the XXVII IAU GA at Rio de Janeiro, the results so far obtained show that the Heliometer of the Observatorio Nacional fulfilled its planed performance of single measurement to the level of few tens of milli-arcsecond, freely pivoting around the heliolatitudes without systematic deviations or error enhancement. We present and discuss the astrometric additions required on ground based astronomic programs. We also discuss instrumental and observations terms, namely the constancy of the basic heliometric angle, against which the measurements are made, and the independence to meteorological and pointing conditions.
Solar activities observed with the New Vacuum Solar Telescope
Authors: Yang Shuhong , Zhang Jun
Published: September 2016

Based on the New Vacuum Solar Telescope observations, some new results about the solar activities are obtained. (1) In the Hα line, a flux rope tracked by filament activation is detected for the first time. There may exist some mild heating during the filament activation. (2) The direct observations illustrate the mechanism of confined flares, i.e., the flares are triggered by magnetic reconnection between the emerging loops and the pre-existing loops and prevented from being eruptive by the overlying loops. (3) The solid observational evidence of magnetic reconnection between two sets of small-scale loops is reported. The successive slow reconnection changes the conditions around the reconnection area and leads to the rapid reconnection. (4) An ensemble of oscillating bright features rooted in a light bridge is observed and given a new name, light wall. The light wall oscillations may be due to the leakage of p-modes from below the photosphere.
Restricted propagation of an “EIT wave” in the low solar corona
Authors: Long David M. , Pérez–Suárez David , Valori Gherardo
Published: September 2016

We present observations of an “EIT wave” associated with an X-class flare from 2012 July 6, the propagation of which was severely restricted by the magnetic structure of the solar corona surrounding the erupting active region. The “EIT wave” was observed by both SDO and STEREO-A, allowing a three-dimensional examination of how the propagation of the disturbance was affected both by a neighbouring coronal hole and a trans-equatorial loop system. In addition, the eruption was observed at the limb by the ground-based CoMP instrument, allowing the Doppler motion associated with the eruption and resulting coronal loop oscillation to be investigated in detail. This combination of data-sets provides a unique insight into the three-dimensional evolution of the “EIT wave” and its effects on the surrounding corona.
The exceptional aspects of the confined X-class flares of solar active region 2192
Authors: Thalmann Julia K. , Su Yang , Temmer Manuela , Veronig Astrid M.
Published: September 2016

During late October 2014, active region NOAA 2192 caused an unusual high level of solar activity, within an otherwise weak solar cycle. While crossing the solar disk, during a period of 11 days, it was the source of 114 flares of GOES class C1.0 and larger, including 29 M- and 6 X-flares. Surprisingly, none of the major flares (GOES class M5.0 and larger) was accompanied by a coronal mass ejection, contrary to statistical tendencies found in the past. From modeling the coronal magnetic field of NOAA 2192 and its surrounding, we suspect that the cause of the confined character of the flares is the strong surrounding and overlying large-scale magnetic field. Furthermore, we find evidence for multiple magnetic reconnection processes within a single flare, during which electrons were accelerated to unusual high energies.
Geant4 simulations of STIX Caliste-SO detector's response to solar X-ray radiation
Authors: Barylak Jaromir , Barylak Aleksandra , Mrozek Tomasz , Steślicki Marek , Podgórski Piotr , Netzel Henryka
Published: September 2016

Spectrometer/Telescope for Imaging X-rays (STIX) is a part of Solar Orbiter (SO) science payload. SO will be launched in October 2018, and after three years of cruise phase, it will reach orbit with perihelion distance of 0.3 a.u. STIX is a Fourier imager equipped with pairs of grids that comprise the flare hard X-ray tomograph. Similar imager types were already used in the past (eq. RHESSI, Yohkoh/HXT), but STIX will incorporate Moiré modulation and a new type of pixelized detectors with CdTe sensor. We developed a method of modeling these detectors' response matrix (DRM) using the Geant4 simulations of X-ray photons interactions with CdTe crystals. Taking into account known detector effects (Fano noise, hole tailing etc.) we modeled the resulting spectra with high accuracy. Comparison of Caliste-SO laboratory measurements of 241Am decay spectrum with our results shows a very good agreement. The modeling based on the Geant4 simulations significantly improves our understanding of detector response to X-ray photons. Developed methodology gives opportunity for detailed simulation of whole instrument response with complicated geometry and secondary radiation from cosmic ray particles taken into account. Moreover, we are developing the Geant4 simulations of aging effects which decrease detector's performance.
Dark feature in EUV post-flare loops
Authors: Song Qiao , Zhang Mei , Wang Jing-Song , Feng Xue-Shang , Zhang Xiao-Xin
Published: September 2016

Post-flare loops (PFLs) usually appear in the late phase of eruptive flares as an arcade-like loop system. The Atmospheric Imaging Assembly (AIA) on-board the Solar Dynamics Observatory (SDO) delivers continuously high temporal and spatial resolution extreme ultraviolet (EUV) observations, providing a unique chance to study the PFLs. In this work, we use SDO/AIA high-quality EUV images to study the dark loop-like features in post-flare loops (DPFLs) of an X5.4 flare. Our analysis shows that: 1) the DPFLs are darker than their surrounding and the bright loops, but are brighter than the EUV background; 2) the DPFLs appear in multiple EUV channels, which indicates that they are absorption features; 3) the DPFLs are associated with downflows that are caused by the thermal instability in the cooling process of the flare.
Updated calculations of the ionization equilibrium for the non-Maxwellian electron n-distributions in solar flares
Authors: Dzifčáková Elena , Dudík Jaroslav
Published: September 2016

The assumption of an equilibrium (Maxwellian) distribution of electron energies cannot explain observed high intensities of the Si XIId satellite lines relative to the Si XIII allowed lines during the flares. However, the presence of n-distribution with a higher and narrower shape than the Maxwellian one is able to explain this behavior. We calculated the ionization equilibrium for the non-thermal n-distributions using the latest atomic data for each element up to the proton number of 30. Significant changes in the shape and maxima of the ion abundance peak occur and can strongly influence the temperature diagnostics.
Flares in A-type stars?
Authors: Pedersen May G. , Antoci Victoria , Korhonen Heidi
Published: September 2016

Stellar flares are known to originate from magnetic reconnection in the atmospheres of late–type stars or through radiatively driven wind instabilities in early–type stars. Situated right between these two groups, the A–type stars are not expected to support either of the two mechanisms. However, recent studies report flare features in theKeplerlight curves of 32 A–type stars, contradicting theory. We investigate the stars reported in literature, setting strong constraints on the detection criteria. Although significantly fewer, we conclude that flare-like features are present. To determine the origin we obtained high-resolution spectra from the Nordic Optical Telescope (NOT) for the ten brightest, flaring A-type stars for 3-4 epochs. Here we present the preliminary results of these spectroscopic observations, with respect to spectral classification and binarity.
Distinguishing between coronal cloud prominences and channel prominences and their associations with solar and stellar flares
Authors: Martin Sara F. , Engvold Oddbjorn , Lin Yong , da Silva Jacqueline Alves
Published: September 2016

To better understand the differences between coronal cloud prominences and channel prominences, we systematically identified and analyzed coronal cloud prominences recorded in SDO/AIA images at 304 Å from 2010 May 20 through 2012 April 28. For the 225 cases identified, their numbers vary directly with the sunspot number. Their durations are typically less than 3 days. Their most frequent maximum height is 90,000 + and - 10,000 km. We offer our hypothesis that many coronal cloud prominences originate from some of the mass of previously erupted filaments ejected high out of their filament channels; subsequently part of this mass falls and collects in leaky magnetic troughs among coronal magnetic fields which constrain the leaked mass to slowly drain downward along curved trajectories where it appears as coronal rain. Currently there is inadequate evidence for a convincing correspondence between either coronal cloud prominences or channel prominences with stellar prominences detected to date.
Slipping magnetic reconnection and complex evolution of a flux rope and flare ribbons
Authors: Li Ting , Zhang Jun
Published: September 2016

Abundant observations in recent years show that the flares are more complex than the 2D standard flare model presents. This proposes a challenge to the 2D flare model and 3D flare model has been developed. We report the complex evolution of flare ribbons and a flux rope in a C8.9 flare event. The two ribbons slipped in opposite directions along the neutral line and the eastern ribbon seemed a hook-like structure. The flare loops were crossed each other, composing a “bi-fan” system. The slipping magnetic reconnection is involved in the flare and leads to slipping motion of flare ribbons and complex evolution of flare loops. Overlying the flare loops, a large-scale flux rope was erupted and meanwhile the eastern end of the flux rope changed with time and slipped along the hook-like ribbon. The fine structures of the flux rope delineated a “triangle-flag” surface, which may imply one-half of the coronal quasi-separatrix layers that surrounds a flux rope. We suggest that the heating process of slipping magnetic reconnection during the flare caused the apparent motion of the flux rope ends.
The shape of M dwarf flares in Kepler light curves
Authors: Davenport James R. A.
Published: September 2016

Ultra-precise light curves from Kepler provide the best opportunity to determine rates and statistical properties of stellar flares. From 11 months of data on the active M4 dwarf, GJ 1243, we have built the largest catalog of flares for a single star: over 6100 events. Combining 885 of our most pristine flares, we generated an empirical white-light flare template. This high-fidelity template shows a rapid initial rise, and two distinct exponential cooling phases. This template is useful in constraining flare energies and for improved flare detection in many surveys. Complex, multi-peaked events are more common for higher energy flares in this sample. Using our flare template we characterize the structure of complex events. In this contributed talk, I presented results from our boutique study of GJ 1243, and described an expanded investigation of the structure of complex flares and their connection to solar events.
On-wafer noise parameters measurement using an extended six-port network and conventional noise figure analyzer
Authors: Ahmed Abdul-Rahman , Lee Dong-Hyun , Yeom Kyung-Whan
Published: September 2016

In this paper, we demonstrate the successful implementation of an onwafer noise parameters test set that employs an extended six-port network and a conventional noise figure analyzer. The necessary formulation that enables the calibration of the noise parameter test set as well as extraction of the noise wave correlation matrix of a two-port device under test (DUT) was tested for coaxial connector-type DUT measurement in an earlier work but not for onwafer-type DUT. Furthermore, we demonstrate the performance of this technique against data obtained from the well-known tuner method. Measurement carried out for very low-noise figure (2 dB) onwafer-type amplifier demonstrates the capability of our technique. The measured noise parameters show fluctuations in minimum noise figure, NFminof ±0.1 dB, and in noise resistance Rnof about 2%. This test set is simple and fast leading to tremendous time- and cost-savings as well as a simplified procedure in onwafer noise parameters measurements.
Effects of a maternal high-fat diet on offspring behavioral and metabolic parameters in a rodent model
Authors: Johnson S. A. , Javurek A. B. , Painter M. S. , Murphy C. R. , Conard C. M. , Gant K. L. , Howald E. C. , Ellersieck M. R. , Wiedmeyer C. E. , Vieira-Potter V. J. , Rosenfeld C. S.
Published: September 2016

Maternal diet-induced obesity can cause detrimental developmental origins of health and disease in offspring. Perinatal exposure to a high-fat diet (HFD) can lead to later behavioral and metabolic disturbances, but it is not clear which behaviors and metabolic parameters are most vulnerable. To address this critical gap, biparental and monogamous oldfield mice (Peromyscus polionotus), which may better replicate most human societies, were used in the current study. About 2 weeks before breeding, adult females were placed on a control or HFD and maintained on the diets throughout gestation and lactation. F1 offspring were placed at weaning (30 days of age) on the control diet and spatial learning and memory, anxiety, exploratory, voluntary physical activity, and metabolic parameters were tested when they reached adulthood (90 days of age). Surprisingly, maternal HFD caused decreased latency in initial and reverse Barnes maze trials in male, but not female, offspring. Both male and female HFD-fed offspring showed increased anxiogenic behaviors, but decreased exploratory and voluntary physical activity. Moreover, HFD offspring demonstrated lower resting energy expenditure (EE) compared with controls. Accordingly, HFD offspring weighed more at adulthood than those from control fed dams, likely the result of reduced physical activity and EE. Current findings indicate a maternal HFD may increase obesity susceptibility in offspring due to prenatal programming resulting in reduced physical activity and EE later in life. Further work is needed to determine the underpinning neural and metabolic mechanisms by which a maternal HFD adversely affects neurobehavioral and metabolic pathways in offspring.