scholarly journals Let there be more variability in two γ Cas stars

2020 ◽  
Vol 494 (1) ◽  
pp. 958-974 ◽  
Author(s):  
Yaël Nazé ◽  
Andrzej Pigulski ◽  
Gregor Rauw ◽  
Myron A Smith
Keyword(s):  
Spectroscopic Analysis ◽  
Activity Levels ◽  
Be Stars ◽  
Spectral Variability ◽  
Short Term ◽  
Photometric Variability ◽  
High Frequencies ◽  
Low Amplitude ◽  
High Degree

ABSTRACT We investigate the short-term optical variability of two γ Cas analogues,  πAqr and BZ Cru, thanks to intensive ground-based spectroscopic and space-borne photometric monitorings. For both stars, low-amplitude (mmag) coherent photometric variability is detected. The associated signals display long-term amplitude variations, as in other Be stars. However, these signals appear at high frequencies, especially in  πAqr, indicating p modes with a high degree l, a quite unusual feature amongst Be stars. While BZ Cru presents only low-level spectral variability, without clear periodicity, this is not the case of πAqr. In this star, the dominant photometric frequencies, near ∼12 d−1, are confirmed spectroscopically in separate monitorings taken during very different disc activity levels; the spectroscopic analysis suggests a probable tesseral nature for the mode.

scholarly journals Three discoveries of γ Cas analogues from dedicated XMM–Newton observations of Be stars

2020 ◽  
Vol 493 (2) ◽  
pp. 2511-2517 ◽  
Author(s):  
Yaël Nazé ◽  
Christian Motch ◽  
Gregor Rauw ◽  
Shami Kumar ◽  
Jan Robrade ◽  
...  
Keyword(s):  
Spectral Characterization ◽  
Spectral Information ◽  
X Rays ◽  
Be Stars ◽  
Spectral Variability ◽  
Short Term ◽  
X Ray ◽  
Long Term Variations

ABSTRACT In the last years, a peculiarity of some Be stars – their association with unusually hard and intense X-ray emission – was shown to extend beyond a mere few cases. In this paper, we continue our search for new cases by performing a limited survey of 18 Be stars using XMM–Newton. The targets were selected either on the basis of a previous X-ray detection (exosat,rosat, XMM-slew survey) without spectral information available or because of the presence of a peculiar spectral variability. Only two targets remain undetected in the new observations and three other stars display only faint and soft X-rays. Short-term and/or long-term variations were found in one third of the sample. The spectral characterization of the X-ray brightest 13 stars of the sample led to the discovery of three new γ Cas (HD 44458, HD 45995, and V558 Lyr), bringing the total to 25 known cases, and another γ Cas candidate (HD 120678), bringing the total to two.

scholarly journals Nemo-Nordic 1.0: A NEMO based ocean model for Baltic & North Seas, research and operational applications

2018 ◽  
Author(s):  
Robinson Hordoir ◽  
Lars Axell ◽  
Anders Höglund ◽  
Christian Dieterich ◽  
Filippa Fransner ◽  
...  
Keyword(s):  
Climate Change ◽  
Ocean Model ◽  
Anthropogenic Pressure ◽  
Short Term ◽  
To Come ◽  
Ocean Forecasting ◽  
The Baltic ◽  
Industrialised Countries ◽  
High Degree

Abstract. We present Nemo-Nordic, a Baltic & North Sea model based on the NEMO ocean engine. Surrounded by highly industrialised countries, the Baltic and North seas, and their assets associated with shipping, fishing and tourism; are vulnerable to anthropogenic pressure and climate change. Ocean models providing reliable forecasts, and enabling climatic studies, are important tools for the shipping infrastructure and to get a better understanding of effects of climate change on the marine ecosystems. Nemo-Nordic is intended to come as a tool for both short term and long term simulations, and to be used for ocean forecasting as well as process and climatic studies. Here, the scientific and technical choices within Nemo-Nordic are introduced, and the reasons behind the design of the model and its domain, and the inclusions of the two seas, are explained. The model's ability to represent barotropic and baroclinic dynamics, as well as the vertical structure of the water column, is presented. Biases are shown and discussed. The short term capabilities of the model are presented, and especially its capabilities to represent sea level on an hourly timescale with a high degree of accuracy. We also show that the model can represent longer time scale, with a focus on the Major Baltic Inflows and the variability of deep water salinity in the Baltic Sea.

The use of patient-reported preoperative activity levels as a stratification tool for short-term and long-term outcomes in patients with adult spinal deformity

2018 ◽  
Vol 29 (1) ◽  
pp. 68-74 ◽  
Author(s):  
Micheal Raad ◽  
Brian J. Neuman ◽  
Amit Jain ◽  
Hamid Hassanzadeh ◽  
Peter G. Passias ◽  
...  
Keyword(s):  
Spinal Deformity ◽  
Adult Spinal Deformity ◽  
Activity Levels ◽  
Long Term Outcomes ◽  
Short Term ◽  
Level Of Activity ◽  
Patient Reported ◽  
Active Patients ◽  
Inactive Group

OBJECTIVEGiven the recent shift in health care toward quality reporting requirements and a greater emphasis on a cost-quality approach, patient stratification with respect to long-term outcomes and the use of health care resources is of increasing value. Stratification tools may be effective if they are simple and evidence based. The authors hypothesize that preoperative patient-reported activity levels might independently predict postoperative outcomes in patients with adult spinal deformity.METHODSThis is a retrospective cohort. A total of 575 patients in a prospective adult spinal deformity surgical database were identified with complete data regarding the preoperative level of activity. Answers to question 5 of the Scoliosis Research Society-22r Patient Questionnaire (SRS-22r) were used to stratify patients into active and inactive groups. Outcomes were length of hospital stay (LOS), level of activity, and reaching the minimum clinically important difference (MCID) for SRS-22r domains and the Physical Component Summary (PCS) of the SF-36 at 2 years postoperatively. The 2 groups were compared with respect to several potential confounders. Covariates with p < 0.1 were controlled for. The impact of activity on LOS was assessed using multivariate negative binomial regression analysis. Multivariate logistic regression models additionally controlling for the respective baseline health-related quality of life (HRQOL) scores were used to assess the association between preoperative activity levels and reaching the MCID at 2 years postoperatively.RESULTSA total of 420 (73%) of the 575 patients who met the inclusion criteria had complete data at 2 years postoperatively. The inactive group was more likely to be significantly older, have a higher Charlson Comorbidity Index, worse baseline radiographic deformity, and greater correction of most radiographic parameters. After controlling for possible confounders, the active group had a significantly shorter LOS (incidence risk ratio 0.91, p = 0.043). After adding respective baseline HRQOL scores to the models, active patients were significantly more likely to reach the MCID for the SRS-22r pain domain (OR 1.72, p = 0.026) and PCS (OR 1.94, p = 0.013). Active patients were also significantly more likely to be active at 2 years postoperatively on multivariate analysis (OR 8.94, p < 0.001).CONCLUSIONSThe authors’ results show that patients who belong to the inactive group are likely to have a longer LOS and lower odds of reaching the MCID in HRQOL or being active at 2 years postoperatively. Inquiring about patients’ preoperative activity levels might be a reliable and simple stratification tool in terms of long- and short-term outcomes in ASD patients.

scholarly journals Short-term Photometric Variability in Be Stars in the Far-Ultraviolet - A Preliminary Report

1987 ◽  
Vol 92 ◽  
pp. 282-285
Author(s):  
R. S. Polidan ◽  
G. J. Peters
Keyword(s):  
Preliminary Report ◽  
Be Stars ◽  
Ultraviolet A ◽  
Short Term ◽  
Photometric Variability ◽  
Preliminary Results ◽  
Far Ultraviolet

AbstractIn this paper we report preliminary results on the first search for short term photometric variations in the far-UV in Be stars. Results for mu Cen and 28 Cyg indicate no significant variations.

Wooden Trusses With Nodal Joints On Glued Flat Rods

2020 ◽  
pp. 9-15
Keyword(s):  
Bearing Capacity ◽  
Test Procedure ◽  
Experimental Studies ◽  
Operational Reliability ◽  
Design Solution ◽  
Short Term ◽  
High Degree ◽  
Wooden Structures ◽  
Node Type

Wooden trusses are widely used in construction and differ in a variety of structural forms. In general, their bearing capacity and stiffness are determined by the design solution of the node joints. In order to accept significant loads and reduce the overall deformation of trusses, it is necessary to develop new types of nodes that would also be characterized by low labor intensity of manufacturing and a high degree of operational reliability. Proposed by the authors nodes of wooden trusses based on steel glued flat rods are met the above requirements. The article describes the results of experimental studies of a wooden truss with nodal joints on glued flat rods under the short-term loads. The layout principles of the proposed node type are given; test procedure of experimental structures and results of experimental studies are presented: features of operation of steel connecting plates glued into wood in the nodes are revealed. It is shown that the adopted design solution of nodes refers to the joints of wooden structures of a rigid type and provides sufficient load-bearing capacity of the trusses and their increased rigidity. The nature of the destruction and the value of the destructive load confirmed the operational reliability of the proposed type of wooden trusses, including under the action of long-term loads. The analysis of the results revealed the directions of further improvement of wooden trusses nodes with steel glued flat rods.

scholarly journals Nemo-Nordic 1.0: a NEMO-based ocean model for the Baltic and North seas – research and operational applications

2019 ◽  
Vol 12 (1) ◽  
pp. 363-386 ◽  
Author(s):  
Robinson Hordoir ◽  
Lars Axell ◽  
Anders Höglund ◽  
Christian Dieterich ◽  
Filippa Fransner ◽  
...  
Keyword(s):  
Climate Change ◽  
Vertical Structure ◽  
Ocean Model ◽  
Anthropogenic Pressure ◽  
Industrialized Countries ◽  
Short Term ◽  
Ocean Forecasting ◽  
The Baltic ◽  
High Degree

Abstract. We present Nemo-Nordic, a Baltic and North Sea model based on the NEMO ocean engine. Surrounded by highly industrialized countries, the Baltic and North seas and their assets associated with shipping, fishing and tourism are vulnerable to anthropogenic pressure and climate change. Ocean models providing reliable forecasts and enabling climatic studies are important tools for the shipping infrastructure and to get a better understanding of the effects of climate change on the marine ecosystems. Nemo-Nordic is intended to be a tool for both short-term and long-term simulations and to be used for ocean forecasting as well as process and climatic studies. Here, the scientific and technical choices within Nemo-Nordic are introduced, and the reasons behind the design of the model and its domain and the inclusion of the two seas are explained. The model's ability to represent barotropic and baroclinic dynamics, as well as the vertical structure of the water column, is presented. Biases are shown and discussed. The short-term capabilities of the model are presented, especially its capabilities to represent sea level on an hourly timescale with a high degree of accuracy. We also show that the model can represent longer timescales, with a focus on the major Baltic inflows and the variability in deep-water salinity in the Baltic Sea.

scholarly journals Investigation of the Co-Movement Relationship between Medical Expenditure and GDP in Taiwan-Based on Wavelet Analysis

2019 ◽  
Vol 16 (24) ◽  
pp. 5095
Author(s):  
Hsin-Pei Hsueh ◽  
Chien-Ming Wang ◽  
Cheng-Feng Wu ◽  
Fangjhy Li
Keyword(s):  
Wavelet Analysis ◽  
Control Variable ◽  
Low Frequency ◽  
Medical Expenditures ◽  
Medical Expenditure ◽  
Short Term ◽  
The Government ◽  
High Degree ◽  
Universal Health

In this study, using the medical expenditures of the Taiwanese government and gross domestic product (GDP) as variables, the wavelet analysis method was used to empirically study the correlations and lead-lag relationships in quarterly data in the period from 1996 to 2016. In addition, the dependent population of the insured was used as the control variable. Results: After the dependent population was included as a control variable, there was a period of low- frequency (one to four years, short-term) linkage correlation, as well as a period of high- frequency (four to eight years, long-term) linkage correlation. In addition, for more than eight years, there was a high degree of linkage correlation, indicating that the linkage between medical expenditures and GDP occurred over the long- term. Moreover, since medical expenditures positively affected GDP, one-way causality was observed. However, after 2008, regardless of whether long or short- term was examined, there was almost no linkage correlation. Before 2008, the medical expenditures of the government were positively correlated with economic growth. After 2008, this effect had already disappeared. The universal health insurance system has long been denounced as a waste of medical resources. The government needs to find a new solution.

The short-term/long-term memory distinction: Back to the past?

2003 ◽  
Vol 26 (6) ◽  
pp. 757-758
Author(s):  
Giuseppe Vallar
Keyword(s):  
Short Term Memory ◽  
Long Term Memory ◽  
Short Term ◽  
Component System ◽  
Term Memory ◽  
The Past ◽  
Multiple Component ◽  
Neuropsychological Evidence ◽  
High Degree

The view that short-term memory should be conceived of as being a process based on the activation of long-term memory is inconsistent with neuropsychological evidence. Data from brain-damaged patients, showing specific patterns of impairment, are compatible with a vision of memory as a multiple-component system, whose different aspects, in neurologically unimpaired subjects, show a high degree of interaction.

scholarly journals The Role of Net Working Capital in the Financing of the Operating Activities of Mining Companies

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Maria SIERPIŃSKA ◽  
Małgorzata KOWALIK
Keyword(s):  
Raw Materials ◽  
Working Capital ◽  
Short Term ◽  
Excess Liquidity ◽  
Current Asset ◽  
Relationship Of ◽  
High Degree ◽  
Operating Activities

The paper examines how companies’ net working capital is used to finance their operating activities. Net working capital is a source oflong-term financing (equity and long-term external capital) and is more expensive than financing through short-term sources, henceits rational use has a significant impact on the efficiency of companies’ operations. The computed level of net working capital is usedto calculate ratios enabling companies to control this capital. The ratios indicate the relationship of net working capital to currentassets, to the sum of accounts receivable and short-term investments, to cash and cash equivalents, and sales revenues. Based on thesecalculations of the relationships, an assessment was made of net working capital engagement in the financing of operating activities inmining companies. These companies maintain a high degree of current asset financing through long-term capital. In mining companieswith diverse mining activities, the level of current assets financing through long-term capital is higher than in coal mining companies.This is due to the maintenance of a higher level of inventories of extracted raw materials, the distance of outlets from the place ofextraction and the method of transport used. Based on the ratio of net working capital to cash and cash equivalents, it was found thatsome companies were overly liquid. Cash balances significantly exceed the value of this capital over a period of three to four years. Asurplus of cash over net working capital in the short term cannot be treated as excess liquidity, as it is the due to flexible managementof this capital.

scholarly journals Does Cardiac Rehabilitation After an Acute Cardiac Syndrome Lead to Changes in Physical Activity Habits? Systematic Review

2015 ◽  
Vol 95 (2) ◽  
pp. 167-179 ◽  
Author(s):  
Nienke ter Hoeve ◽  
Bionka M.A. Huisstede ◽  
Henk J. Stam ◽  
Ron T. van Domburg ◽  
Madoka Sunamura ◽  
...  
Keyword(s):  
Physical Activity ◽  
Randomized Clinical Trials ◽  
Evidence Synthesis ◽  
Activity Levels ◽  
Long Term Effects ◽  
Short Term ◽  
Home Based ◽  
Best Evidence Synthesis ◽  
Physical Activity Levels

BackgroundOptimal physical activity levels have health benefits for patients with acute coronary syndrome (ACS) and are an important goal of cardiac rehabilitation (CR).PurposeThe purpose of this study was to systematically review literature regarding short-term effects (&lt;6 months after completion of CR) and long-term effects (≥6 months after completion) of standard CR on physical activity levels in patients with ACS.Data SourcesPubMed, EMBASE, CINAHL, and PEDro were systematically searched for relevant randomized clinical trials (RCTs) published from 1990 until 2012.Study SelectionRandomized clinical trials investigating CR for patients with ACS reporting physical activity level were reviewed.Data ExtractionTwo reviewers independently selected articles, extracted data, and assessed methodological quality. Results were summarized with a best evidence synthesis. Results were categorized as: (1) center-based/home-based CR versus no intervention, (2) comparison of different durations of CR, and (3) comparison of 2 types of CR.Data SynthesisA total of 26 RCTs were included. Compared with no intervention, there was, at most, conflicting evidence for center-based CR and moderate evidence for home-based CR for short-term effectiveness. Limited evidence and no evidence were found for long-term maintenance for center-based and home-based CR, respectively. When directly compared with center-based CR, moderate evidence showed that home-based CR has better long-term effects. There was no clear evidence that increasing training volume, extending duration of CR, or adding an extra intervention to CR is more effective.LimitationsBecause of the variety of CR interventions in the included RCTs and the variety of outcome measures in the included RCTs, pooling of data was not possible. Therefore, a best evidence synthesis was used.ConclusionsIt would appear that center-based CR is not sufficient to improve and maintain physical activity habits. Home-based programs might be more successful, but the literature on these programs is limited. More research on finding successful interventions to improve activity habits is needed.

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