bluuebunny/crossref_metadata_2025_split huggingface dataset:
International Student Mobility in Psychology: an Analysis of Brazilian Students in Portuguese Higher Education
Authors: Aguiar Joyce , de Santis Ligia , Sin Cristina 
Published: February 2023

Abstract
Student mobility has been one of the most impactful manifestations of higher education (HE) internationalization. Recently, many studies have looked at this phenomenon, although few have focused on mobility from countries which are not major student exporters and to countries that are not main recruiters. This paper aims to uncover how the increasing internationalization of HE is reflected in the mobility of Brazilian Psychology postgraduate students to Portugal, two countries which share a metropolis-colony past. Two objectives are pursued: first, to carry out a characterization of Psychology postgraduate students from Brazil who study in Portugal; second, to analyze the assignment of scholarships by the Brazilian government. Descriptive analysis and a social network analysis technique were performed to official statistical data available in both countries. Social Sciences, Business and Law is the most sought-after area by Brazilian students in mobility, and within this area, Psychology students are third in absolute numbers. The majority of Psychology students were in degree mobility, being almost ten times more than those in credit mobility, and a constant preference for public institutions was observed. The Portuguese institutions most sought-after are the University of Porto, the University of Coimbra and the University of Lisbon. Institutions located in Brazil’s South and southeast regions stand out with the number of mobility grants. This work contributes to shed light on realities of international mobility beyond the major recruiting and/or sending countries. Its novelty also resides in the contribution to knowledge about mobility between spaces where a colonial logic leads students’ flows.
Product Lifecycle Information Flow in E-waste Handling: a Means to Increase Circularity?
Authors: Andersen Terje , Halse Lise Lillebrygfjeld 
Published: February 2023

AbstractElectronic waste (e-waste) is a growing waste stream. In Europe, e-waste is regulated by the Waste Electrical and Electronic Equipment (WEEE) Directive. Each manufacturer or importer is responsible for the end-of-life (EoL) treatment of the equipment it handles, although this task is usually outsourced to producer responsibility organizations (PROs) that collect and treat the e-waste. The WEEE regime has been criticized for focusing on waste handling according to the traditional linear economy, while, in a circular economy, the goal is to eliminate waste. Information sharing helps improve circularity, and digital technology is seen as enabling information transparency and visibility in the supply chain. However, there is need for empirical studies demonstrating the use of information in supply chains to improve circularity. We conducted a case study of a manufacturer, including its subsidiaries and PROs in eight European countries, in which we investigated the product lifecycle information flow related to e-waste. Our findings indicate that product lifecycle information is available, but that it is provided for purposes other than e-waste handling. Actors are willing to share this information, but it is not regarded as useful for EoL treatment since the actors involved in EoL handling believe that using this information could lead to delays and poorer performance in e-waste handling. Our findings contradict the optimistic view of digital technology as improving circularity in circular supply chain management. The findings further give reason to question the implementation of digital technology to improve the product lifecycle information flow as long as the involved actors do not request this information.
The ambulatory care of patients with post-acute sequelae of COVID-19
Authors: Strumann Christoph , von Meißner Wolfgang C. G. , Blickle Paul-Georg , Steinhäuser Jost 
Published: February 2023

Abstract
Background
There is an increasing number of patients that do not make a rapid or full recovery from a SARS-CoV-2 infection, the Coronavirus Disease 2019 (COVID-19) and suffer from the so-called “long-COVID” or post-acute sequelae of COVID-19 (PASC). The long-term implications for health services are expected to be substantial. The objective of this analysis was to estimate the utilization of outpatient services from primary and secondary care. Further, we evaluated the multidisciplinary ambulatory care management of PASC patients in Germany.

Methods
All members of the Physician network “MEDI Baden-Württemberg e.V.”, i.e., 1,263 primary care physicians (PCPs) and 1,772 specialists working in secondary care were invited to participate in a questionnaire surveying routine data regarding the general care situation at the physician practice level of patients suffering from PASC. Bivariate analyses were applied to consider potential differences between primary and secondary care.

Results
In total, 194 physicians participated in this survey (response rates of 9.6% (primary care) and 4.1% (secondary care). On average, each physician treated 31.9 PASC patients. Most PASC patients (61.2%) had three or more long-COVID symptoms. On average, 10.6 PASC patients visited a physicians’ practice per quarter. The additional consulting effort for treating PASC patients was 34.1 min (median: 20 min) and higher in primary care. Most PCPs (71.1%) integrated secondary care in the treatment of their PASC patients. Less than half of the PASC patients (42.0%) sought secondary care with a referral from primary care. 5.7 patients visited the physicians’ practices per week, who were concerned about suffering from PASC without any following medical confirmation. This caused an average additional effort for the physicians of 17.5 min per visit. There were no differences between rural and urban areas.

Conclusion
Our results reveal that there is a substantial additional consulting effort for treating PASC patients that is especially high in primary care. The additional consulting effort results from the consultation of a particular high number of patients that are concerned about suffering from PACS without a following medical confirmation. To guarantee a high quality and adequate provision of care for a potentially further increasing number of concerned patients, the ambulatory health services should be strengthened and adequately compensated.
Dynamics of cavity structures and wall-pressure fluctuations associated with shedding mechanism in unsteady sheet/cloud cavitating flows
Authors: Wang Changchang , Zhang Mindi 
Published: February 2023

The physics and mechanism of sheet/cloud cavitation in a convergent–divergent channel are investigated using synchronized dynamic surface pressure measurement and high-speed imaging in a water tunnel to probe the cavity shedding mechanism. Experiments are conducted at a fixed Reynolds number ofRe = 7.8 × 105for different values of the cavitation numberσbetween 1.20 and 0.65, ranging from intermittent inception cavitation, sheet cavitation to quasi-periodic cloud cavitation. Two distinct cloud cavitation regimes, i.e. the re-entrant jet and shockwave shedding mechanism, are observed, accompanied by complex flow phenomenon and dynamics, and are examined in detail. An increase in pressure fluctuation intensity at the numbers 3 and 4 transducer locations are captured during the transition from re-entrant jet to shockwave shedding mechanism. The spectral content analysis shows that, in cloud cavitation, several frequency peaks are identified with the dominant frequency caused by the large-scale cavity shedding process and the secondary frequency related to re-entrant jet/shockwave dynamics. Statistical analysis based on defined grey level profiles reveals that, in cloud cavitation, the double-peak behaviours of the probability density functions with negative skewness values are found to be owing to the interactions of the re-entrant jet/shockwave with cavities in the region of 0.25 ~ 0.65 mean cavity length (Lc). In addition, multi-scale proper orthogonal decomposition analysis with an emphasis on the flow structures in the region of 0.25 ~ 0.65Lcreveals that, under the shockwave shedding mechanism, both the re-entrant jet and shockwave are captured and their interactions are responsible for the dynamics and statistics of cloud shedding process.
A Proof of the Extended Delta Conjecture
Authors: Blasiak Jonah , Haiman Mark , Morse Jennifer , Pun Anna , Seelinger George H. 
Published: February 2023

Abstract
We prove the extended delta conjecture of Haglund, Remmel and Wilson, a combinatorial formula for

$\Delta _{h_l}\Delta ' _{e_k} e_{n}$

, where

$\Delta ' _{e_k}$

and

$\Delta _{h_l}$

are Macdonald eigenoperators and

$e_n$

is an elementary symmetric function. We actually prove a stronger identity of infinite series of

$\operatorname {\mathrm {GL}}_m$

characters expressed in terms of LLT series. This is achieved through new results in the theory of the Schiffmann algebra and its action on the algebra of symmetric functions.
A Shuffle Theorem for Paths Under Any Line
Authors: Blasiak Jonah , Haiman Mark , Morse Jennifer , Pun Anna , Seelinger George H. 
Published: February 2023

AbstractWe generalize the shuffle theorem and its$(km,kn)$version, as conjectured by Haglund et al. and Bergeron et al. and proven by Carlsson and Mellit, and Mellit, respectively. In our version the$(km,kn)$Dyck paths on the combinatorial side are replaced by lattice paths lying under a line segment whosexandyintercepts need not be integers, and the algebraic side is given either by a Schiffmann algebra operator formula or an equivalent explicit raising operator formula. We derive our combinatorial identity as the polynomial truncation of an identity of infinite series of$\operatorname {\mathrm {GL}}_{l}$characters, expressed in terms of infinite series versions of LLT polynomials. The series identity in question follows from a Cauchy identity for nonsymmetric Hall–Littlewood polynomials.
Efficacy of vitamin D supplementation in reducing body mass index and lipid profile in healthy young adults in Colombia: a pilot randomised controlled clinical trial
Authors: Serrano Norma C. , Rojas Lyda Z. , Gamboa-Delgado Edna M. , Suárez Diana Paola , Salazar Acosta Isail , Romero Sandra L. , Forero Mario , Quintero-Lesmes Doris C. 
Published: February 2023

Abstract
The objective of the present study was to evaluate the efficacy of oral administration of vitamin D supplementation in reducing BMI and lipid profile in adolescents and young adults from a cohort in Bucaramanga, Colombia. One hundred and one young adults were randomly assigned to one of two doses of vitamin D [1000 international units (IU) or 200 IU] administered daily for 15 weeks. The primary outcomes were serum 25(OH)D levels, BMI and lipid profile. The secondary outcomes were waist-hip ratio, skinfolds and fasting blood glucose. We found a mean ± sd plasma concentration of 25-hydroxyvitamin D [25(OH)D] was 25⋅0 ± 7⋅0 ng/ml at baseline, and after 15 weeks, it increased to 31⋅0 ± 10⋅0 ng/ml in the participants who received a daily dose of 1000 IU, (P < 0⋅0001). For the participants in the control group (200 IU), it went from 26⋅0 ± 8⋅0 ng/ml to 29⋅0 ± 8⋅0 ng/ml (P = 0⋅002). There were no differences between groups in body mass index. There was a statistically significant decrease in LDL-cholesterol between the intervention group v. the control group (mean difference −11⋅50 mg/dl (95 % CI −21⋅86 to −1⋅15; P = 0⋅030). The conclusions of the present study were two different doses of vitamin D supplementation (200 IU v. 1000 IU) produced changes in serum 25(OH)D levels over 15 weeks of administration in healthy young adults. No significant changes were found in the body mass index when the effect of the treatments was compared. A significant reduction in LDL-cholesterol was found when comparing the two intervention groups.
Trial registration: NCT04377386
Prandtl-Batchelor flow on a circular
cylinder and on aerofoil sections
Authors: Giannakidis G. 
Published: February 2023

AbstractSteady, inviscid, incompressible, two dimensional flows
containing vortex patches bounded by vortex sheets
are used to model finite separated regions on
certain closed bodies as an approach to modelling
separation bubbles. First of all the problem of a
vortex patch on a circle is considered. Calculations
were done for symmetric flows covering a wide range
of values of the separation position, the strength
of the vortex sheet and the circulation at infinity
and for non-symmetric flows at various angles of
incidence. Smooth separation was detected in some
cases. This model is used as an intermediate step
for the calculation of the flow around an ellipse
and a Joukowski aerofoil with the use of the
Joukowski transformation.
Aerofoil ground effect
revisited
Authors: Coulliette C. , Plotkin A. 
Published: February 2023

AbstractSteady state aerofoil ground effect is studied both
numerically and analytically. Discrete vortex and
linear vortex panel methods are applied to a
parabolic arc and symmetric Joukowski aerofoil,
respectively. A single vortex model for the flow
over the parabolic arc aerofoil is developed. The
single vortex model and other analytical solutions,
valid either near or far from the ground, are
compared with the numerical results. The numerical
results are used to delineate the influences of
angle of attack, camber and thickness. For small
values of camber and angle of attack, normalised
lift is enhanced near the ground and reduced far
from it. For a fixed distance above the ground,
normalised lift decreases with increasing angle of
attack and camber. Thickness reduces lift at all
heights above the ground.
Aeronautical technology — recent advances
and future prospects
Authors: Pope G. G. 
Published: February 2023

SummaryRecent advances in aeronautical technology are
reviewed, with particular reference to work in the
United Kingdom, and the process is outlined whereby
these have progressed from fundamental research
through to exploitation in marketable products.
Aerodynamic, materials, propulsion and avionic
aspects are discussed and successful applications
described in commercial and combat aircraft and
helicopters. Current and anticipated advances in
technology are considered in the context of possible
future applications, including brief consideration
of the possibility of a new generation of supersonic
transport aircraft. Lessons are drawn from past
experience on actions necessary now if these
advances are to be exploited successfully in
improving the performance, or reducing the
acquisition or operating cost, of the next
generation of aircraft, without introducing an
unacceptable level of risk.
Unsteady aerodynamic effects of trailing
edge controls on delta wings
Authors: Pilkington D. J. , Wood N. J. 
Published: February 2023

AbstractEffective control of combat aircraft at high angles of
attack requires the flight control system to operate
to higher frequencies and gains. This increases the
possibility of excitation of the structural modes by
altering the aeroservoelastic stability of the
complete system. This paper details the results of
tests carried out on a rigid, 55° leading edge sweep
delta wing, half model fitted with a half span
elevon operated through a closed loop control
system. The effects of steady elevon deflections up
to 40° angle of attack are described. The unsteady
pressures resulting from elevon oscillations at
frequency parameters up to a value equivalent to the
first wing bending mode of a typical combat aircraft
have been measured. The effect of the elevon
oscillation on the elevon itself and on the bending
mode have been estimated by calculating the unsteady
hinge and root bending moments about the wing root.
The lower surface, unsteady elevon effects were
found to be independent of incidence and frequency
parameter. The amplitude of response of the weak
vortex on the upper surface of the wing reduced
rapidly with frequency parameter. Above an incidence
of 10°, the vortex breakdown was above the wing and
led to a further reduction in the vortex response.
The vortex response lagged the elevon motion.
Drag reduction in a rectangular duct using
riblets
Authors: A. R. Moore  , M. V. Lowson  
Published: February 2023

AbstractAn experimental investigation has been made into the
effects of riblets on the drag in a rectangular duct
of aspect ratio 10. It has been found that a maximum
drag reduction of approximately 10% occurs in fully
developed turbulent flow. This figure is larger than
the 6–8% drag reduction usually found for external
flow. The maximum drag reduction occurred when the
height of the riblets was between 7 and 13 wall
units. Analysis of the developing region of the flow
has shown a maximum drag reduction of approximately
8% at a wall unit value of 13, consistent with
results in external flows. The effects of riblets on
transition has also been investigated. It was found
that riblets delayed transition by 2–4% in critical
Re as measured by peak flatness, and caused some
extension in the length of the transition process,
so that the completion of transition was delayed by
between 4–8%, with the stronger effect at the lower
Reynolds numbers.
Use of maximum lift and angle of attack, a
review of experience within BAe Military
Aircraft
Authors: McMichael T. , McKay K. 
Published: February 2023

AbstractPrior to the adoption of modern flybywire high
authority flight control systems, the usable lift or
angle of attack was usually dictated by the wing
stall and subsequent loss of control of the
aircraft.With the advent of the high authority FCS, with high
levels of integrity, the designer of modern combat
aircraft faces the possibility of providing good
levels of aircraft control up to and well beyond the
AoA at which maximum lift or loss of control would
have occurred in the past. Further, the use of such
control systems has allowed maximum advantage to be
taken of control configured vehicle technology to
enhance the performance of the aircraft within the
conventional angle of attack range.This paper provides a review of the experience which
has been gathered within BAe Military Aircraft,
Warton, in the use and benefits of these
technologies with regard to the high AoA capability
and impact on maximum usable lift. Examples are
drawn from the Tornado, Jaguar FBW and EAP aircraft
programmes, all of which have employed flybywire
control, to some degree or other, combined with
varying degrees of CCV technology, leading to their
adoption on the Eurofighter 2000 programme.In doing this, some of the engineering compromises
which the modern aircraft designer faces in
achieving the customer required levels of aircraft
performance will be addressed, together with the
outcome which has satisfied these purposes in the
particular example considered. In particular, the
power of the modern FCS places an increased reliance
on the knowledge of the aerodynamics of the
aircraft, around which the FCS must be designed.
This raises particular challenges in the increased
AoA ranges which associate with the maximum lift of
these high performance configurations.The paper concludes with an indication of the
developments in technology which are evolving and
which will lead to further advances and increased
capability combat aircraft in future years.
Pressure measurements on a half delta wing
oscillating in pitch
Authors: Vaughan J. P. , Wood N. J. 
Published: February 2023

AbstractA rigid, 55° sweep, half delta wing has been oscillated
in pitch at subsonic speeds, and the unsteady
pressures on both the upper and lower surfaces
recorded for pre-stalled conditions. The
oscillations were of low amplitude and at
frequencies equivalent to a typical wing first
bending mode for full scale applications.When compared to a quasi-steady approximation, the
unsteady pressures on the upper surface of the wing
lag the steady case along the line of the primary
attachment. The lag represents a constant convective
time from the leading-edge with increasing frequency
of oscillation. A further localised area of lagging
flow is observed beneath the vortex burst point, the
location of which is a function of mean angle of
attack.The magnitude of the unsteady pressure variations was
seen to increase linearly with the amplitude of the
pitching oscillation while the phase lag was seen to
increase linearly with frequency parameter.
A correlation indicating incipient dynamic
stall
Authors: Gracey M. W. , Niven A. J. , Coton F. N. , McD. Galbraith R. A. , Jiang D. 
Published: February 2023

AbstractThis paper proposes a correlation which attempts to
relate an aerofoil's low speed dynamic stall onset
incidence to particular parameters describing its
stall behaviour in steady conditions. These
parameters, which can be derived from experiment or
predictive algorithm, are the incidence of steady
stall and a term related to trailing-edge separation
characteristics. The correlation is based on a large
amount of data obtained from a number of aerofoils
broadly classified into two families: the NACA four
digit series of symmetrical sections and a family of
four profiles with the NACA 23012 as the generic
shape.The correlation has been extended to low pitch rates
outside the “deep” dynamic stall range and, whilst
it pertains to stalling under ramp motions, a link
has been established with oscillatory motions. The
potential of the correlation is demonstrated by its
application to the design of a symmetric aerofoil
for use on wind turbines.
Development of a real-time simulation of a
Vstol aircraft
Authors: Gillespie A. J. , Handley S. J. 
Published: February 2023

AbstractThis paper describes the implementation of the DRA
GVAM87 model in Modula-2, using the Hood design
methodology, and the subsequent validation of the
real-time model running on a personal computer. The
work demonstrates that the execution speed of the
model is not compromised while overall validity of
the simulation is maintained. The model was
interfaced with an existing simulation of the Sea
Harrier head-up display (hud) in order to provide
visual cues of the aircraft's motion during piloted
flight.
An experimental technique for accurate
simulation of the flow field for
wing-in-surface-effect craft
Authors: Sowdon A. , Hori T. 
Published: February 2023

SummaryThis paper describes a simple method to accurately
simulate the flow field around a wing in surface
effect ship (Wises) model that involves the use of a
contraction and a slot to suck the boundary layer
from a flat plate. Theoretical aspects of the design
are discussed with relation to the required level of
suction and the slot width.The effectiveness is ascertained from measurements of
the boundary layer height on the plate through
measurement of the mean velocity profile and a
reduction in height of 50% was generally observed
when suction was used.Comparison of the forces on a low aspect-ratio wing,
obtained from the proposed and the image method,
verified the proposed method for wing heights above
2·5% of the mean chord. At lower heights, separation
of the boundary layer on the ground plate is thought
to have altered the pressure distribution on the
wing.