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Article
Quaternion Hyperbolic Fourier Transforms and Uncertainty Principles
The present study introduces the two-sided and right-sided Quaternion Hyperbolic Fourier Transforms (QHFTs) for analyzing two-dimensional quaternion-valued signals defined in an open rectangle of the Euclidean...
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Article
Open AccessGlobal Operator Calculus on Spin Groups
In this paper, we use the representation theory of the group \(\textrm{Spin}(m)\) Spin
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Article
Transanal versus laparoscopic total mesorectal excision: a comparative study of long-term oncological outcomes
Transanal total mesorectal excision (TaTME) is the most recent approach developed to improve pelvic dissection in surgery for mid and low rectal tumors. There are still inconsistencies regarding the technique’...
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Article
Automated objective surgical planning for lateral skull base tumors
Surgical removal of pathology at the lateral skull base is challenging because of the proximity of critical anatomical structures which can lead to significant morbidity when damaged or traversed. Pre-operativ...
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Article
Left atrial ejection fraction is an indicator of left ventricular diastolic function
Left atrial ejection fraction (LAEF) has been previously shown to accurately distinguish between patients with and without clearly defined left ventricle diastolic dysfunction (LVDD) by ASE/EACVI criteria, but...
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Article
Application of the Fractional Sturm–Liouville Theory to a Fractional Sturm–Liouville Telegraph Equation
In this paper, we consider a non-homogeneous time–space-fractional telegraph equation in n-dimensions, which is obtained from the standard telegraph equation by replacing the first- and second-order time derivati...
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Article
Threats to seabirds in Portugal: integrating data from a rehabilitation centre and stranding network
Thousands of marine animals are injured and killed each year across Europe. Wildlife rehabilitation centres play an important role to rehabilitate sick and injured animals and return them to the wild. This stu...
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Article
Open AccessIs the Patient Activation Measure a valid measure of osteoarthritis self-management attitudes and capabilities? Results of a Rasch analysis
The Patient Activation Measure (PAM-13) was developed using Rasch analysis to assess knowledge, skills and confidence in the management of one’s health. Previous studies report positive relationships between P...
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Article
Distinct Profiles of Consumers of Psychoactive Substances in People Attending French Sexual Transmitted Infections Centers
The objective of this cross-sectional survey was to assess the prevalence of psychoactive substance use (PSU) in people attending 11 French Sexual Transmitted Infection Centers, and to specify their profiles (...
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Article
Fundamental Solution for Natural Powers of the Fractional Laplace and Dirac Operators in the Riemann–Liouville Sense
In this paper, we study the fundamental solution of natural powers of the n-parameter fractional Laplace and Dirac operators defined via Riemann–Liouville fractional derivatives. To do this we use iteration throu...
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Article
A Time-Fractional Borel–Pompeiu Formula and a Related Hypercomplex Operator Calculus
In this paper we develop a time-fractional operator calculus in fractional Clifford analysis. Initially we study the \(L_p\) ...
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Article
Razorbill Alca torda mortality in the Portuguese west coast
This study presents data on mortality events of the species Alca torda in the central region of Portugal and data was also used to improve reporting of species biometrics in wintering grounds. A total of 646 razo...
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Article
Surveillance of Arboviruses in Primates and Sloths in the Atlantic Forest, Bahia, Brazil
From 2006 through 2014, we conducted seroepidemiological surveys on non-human primates and sloths to investigate the possible circulation of arboviruses in Bahia Atlantic Forest, Brazil. We collected a total o...
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Article
Engineering Design and Mechanical Property Characterisation of 3D Warp Interlock Woven Fabrics
3D warp interlock fabrics have been used both in composite materials as fibrous reinforcement as well as in protective solutions against impact mainly due to their improved capacity to absorb energy by higher ...
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Article
Open AccessMARTA: a high-energy cosmic-ray detector concept for high-accuracy muon measurement
A new concept for the direct measurement of muons in air showers is presented. The concept is based on resistive plate chambers (RPCs), which can directly measure muons with very good space and time resolution...
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Article
First and Second Fundamental Solutions of the Time-Fractional Telegraph Equation with Laplace or Dirac Operators
In this work we obtain the first and second fundamental solutions (FS) of the multidimensional time-fractional equation with Laplace or Dirac operators, where the two time-fractional derivatives of orders ...
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Article
Cytotoxicity studies of membranes made with cellulose nanofibers from fique macrofibers
We report on the fabrication of cellulose nanofibers from Fique (Furcraea andina), in which raw macrofibers were chemically treated and then ground. Bleaching was effective in removing lignin from the raw fibers...
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Article
Eigenfunctions and Fundamental Solutions of the Fractional Laplace and Dirac Operators: The Riemann-Liouville Case
In this paper we study eigenfunctions and fundamental solutions for the three parameter fractional Laplace operator $$\Delta _+^{(\alp...
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Article
Simvastatin effects on detoxification mechanisms in Danio rerio embryos
The transcription and protein activity of defence mechanisms such as ABC transporters, phase I and II of cellular detoxification and antioxidant enzymes can be altered in the presence of emerging contaminants ...
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Article
Prevalence of falls in an urban community-dwelling older population of Cape Town, South Africa
Falls are a major cause of disability and mortality in older adults. Studies on falls in this population have mainly been conducted in high income countries, and scant attention has been given to the problem i...
