Miracle-dz/UniFAR-FTUs huggingface dataset:
Coherence properties of a semiconductor laser with feedback from a distant reflector: experiment and theory

The visibility, i.e. the absolute value of the field-autocorrelation function, of a semiconductor laser subject to optical feedback has been measured. The feedback was provided by a mirror that was placed at a distance exceeding the coherence length of the emitted light. The amount of feedback varied between zero and the maximum feedback, for which the laser still operated in a single longitudinal mode of the semiconductor chip. The results are compared with numerical solutions of the Lang and Kobayashi equations. Over the whole range of feedback excellent agreement between experiment and theory was found. However. this agreement requires an unusually high value of the linewidth enhancement factor, i.e. a=10; the reason for this remains unclear. The self-sustained noise model, which is based on a statistical-analytical solution of the Lang and Kobayashi equations and which has been used in the past for analyzing feedback effects, is found to yield an inaccurate description of the experiments. Suggestions are given to explain this inadequacy. >
How Far Are We from Research That Is Independent of the Use of Animal Models? A Comparative Analysis between Animal and 3D/On-a-Chip Models for the Study of Respiratory Diseases

Over the last ten years, with the progress of in vitro culture methods, it has been possible to build increasingly reliable models to effectively mimic in vivo ones. The translational methodological approach that combined biotechnology and biomedical engineering has produced remarkable results, such as the development of ex vivo 3D culture models, the construction of on-a-chip organoids, and the construction of complex systems capable of bypassing the static nature of the two-dimensional cultural models that have been typical of in vitro studies conducted to date. However, nowadays, there is still reluctance to completely abandon the animal model as an essential reference or as an integrated step for the validation of a model or a proposed study. This is due to the partially correct conviction of the impossibility of reproducing, in vitro or ex vivo, the complexity of pathological models or the spatial communication between different cytotypes, as well as, more generally, the lack of systems capable of mimicking the dynamism of a complex in vivo system. In this study, we will compare different methodological approaches in the study of the three most common types of respiratory diseases: chronic obstructive pulmonary disease (COPD), asthma, and lung carcinomas. The purpose of this comparative study is to evaluate the most current methodological approaches to understand how far research is from being independent from animal models. Animal studies are generally considered necessary, but are still questioned because of the ethics and the cost–benefit ratio involved.
TUNNELING BETWEEN TWO DIMENSIONAL ELECTRON SYSTEMS IN A HIGH MAGNETIC FIELD AND CRYSTALLINE PHASES OF A TWO DIMENSIONAL ELECTRON SYSTEM IN A MAGNETIC FIELD

of Dissertation Presented to the Graduate School of the University of Florida in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy TUNNELING BETWEEN TWO DIMENSIONAL ELECTRON SYSTEMS IN A HIGH MAGNETIC FIELD AND CRYSTALLINE PHASES OF A TWO DIMENSIONAL ELECTRON SYSTEM IN A MAGNETIC FIELD By Filippos Klironomos May 2005 Chairman: Alan T. Dorsey Major Department: Physics We study the bilayer quantum Hall system in the incoherent regime. We model the two layers as correlated Wigner crystals due to the presence of interlayer interactions and take the continuum limit that treats the system as an elastic medium. Using this approach, we find an analytic solution for the collective modes of the system and calculate the tunneling current associated with external electrons coupled to these modes, reproducing experimental results. Investigation of the role of interlayer interactions into the response of the system reveals a dual nature: they introduce an excitation gap in the collective modes and also soften the effect of intralayer interactions. We further study the collective states formed by the 2D electrons at low Landau levels by working from a semi-classical and microscopic perspective and evaluating the elastic moduli, normal modes, and zero-point and cohesive energies of the different crystalline structures. The effects of screening from filled Landau levels and finite thickness of the sample are found not to influence the overall interplay of the phases. When probing the internal degrees of the crystalline structures, the energy
Nonlinearity for a parallel kinematic machine tool and its application to interpolation accuracy analysis

This paper is concerned with the kinematic nonlinearity measure of parallel kinematic machine tool (PKM), which depends upon differential geometry curvalure. The nonlinearity can be described by the curve of the solution locus and the equal interval input of joints mapping into inequable interval output of the end-effectors. Such curing and inequation can be measured by BW curvature. So the curvature can measure the nonlinearity of PKM indirectly. Then the distribution of BW curvature in the local area and the whole workspace are also discussed. An example of application to the interpolation accuracy analysis of PKM is given to illustrate the effectiveness of this approach.
Medical Household Waste as a Potential Environmental Hazard: An Ecological and Epidemiological Approach

Nowadays, the contamination caused by emerging pollutants is a global concern due to the lack of scientific evidence to demonstrate the risk or toxicity to humans due to the presence of pharmaceutical residues in the environment. This study aimed to identify and describe the disposal practices of unused and unwanted medications, as well as to analyze and identify the most frequent drugs determined on water bodies adjacent to the biggest urban population in Mexico. A two-phase study with an epidemiological and an ecological assessment was performed. The epidemiological phase was carried out with a descriptive cross-sectional study among citizens from Mexico City and the metropolitan area using an electronic survey applied to 719 subjects aimed to assess practices in which pharmaceutical products are disposed. The ecological phase included a review of scientific reports. The results show that nearly 83.5% of those surveyed use inappropriate practices for disposal medicines, the main ones are through the municipal dump or directly in the drain. The ecological approach was carried out by a systematic literature review of original reports published between 2013 to 2023; information about the class of drugs, active substance, environmental compartments, location, and concentration was extracted and presented. Fifty-one different types of pharmaceutical residues were detected in wastewater in Mexico City in the last decade. The results of this study can contribute to the application of public policies for waste management authorities to mitigate the socio-environmental risks due to the inappropriate disposal of medicines.
Integrating strength and conditioning training and golf practice during the golf season: Approaches and perceptions of highly skilled golfers

Contemporary evidence has demonstrated strength and conditioning (S&C) training benefits golf performance, primarily by improving clubhead speed. However, no empirical data exist that describe how, or even if, golfers integrate their S&C training and golf practice. Therefore, the aim of this study was to investigate the perceptions and practices of skilled golfers with regards to planning the season and how S&C is structured in the golf year. Sixty-five (male n = 48; female n = 17) Category 1 amateur (n = 50) and professional (n = 15) golfers completed a mixed-methods online survey. Survey answers were either golf practice or S&C training focused. Results showed the majority of golfers engage with S&C training (n = 44; 67.7%) and follow a programme (n = 53. 81.5%). Contrastingly, they reported having little structure for golf practice, choosing to have no annual plan (n = 14; 21.9%), have a reactive approach (n = 22. 34.9%) based on recent performances or training what feels appropriate/enjoyable (n = 15; 23.8%). Golfers reported they adjust their training around competition (n = 47; 74.6%) but with various approaches. The dichotomous and contradictory responses received across multiple answers demonstrate that continued education and research are required to help golfers integrate S&C training with their golf practice.
Effect of increasing thickness on tensile-strained germanium grown on InGaAs buffer layers

We have investigated the optical properties of tensile-strained germanium grown on InGaAs buffer layers as a function of film thickness and buffer layer composition. We study the dependence of the photoluminescence as a function of the strain amplitude and degree of relaxation which are also monitored by X-ray diffraction and Raman spectroscopy. We show that 0.75% biaxially strained germanium can be obtained up to a thickness of 150 nm, a value sufficiently high to allow confinement of the spontaneous emission in a guiding structure. For large thicknesses (>200 nm) and large indium content in the buffer layer, a partial relaxation of the film is observed characterized by a large in-plane anisotropy of the germanium lattice. In this case, a difference of strain magnitude deduced either by microphotoluminescence spectra or by X-ray or Raman measurements is reported. We explain this difference by the sensitivity of microphotoluminescence to the local properties of the material. This study provides guidelines.
Managerial confidence and capital structure announcement effects on share prices on the Johannesburg Share Exchange

Background: In an attempt to enhance our understanding of the important determinants of the debt–equity choice, there is a need to explore the behavioural facets driving the decision to issue either debt or equity. Furthermore, the divergent set of implications of equity and debt issues on the share prices are empirical matters that need to be addressed.Aim: In this article the link is investigated between managerial confidence and the likelihood of issuing debt, as well as the share price implications of equity and debt issue announcements on the Johannesburg Share Exchange (JSE). Setting: The study is based on the equity bond issue announcements of JSE-listed firms for the period 2000–2020.Method: In this article, panel data regression and event study approaches are used in a sample of 81 and 113 bond and equity issue announcements, respectively, for 69 firms listed on the JSE.Results: The main findings of this article indicate that managerial optimism drives debt issuing activities on the JSE and that there are negative and significant abnormal returns associated with the announcement of equity issues.Conclusion: Overall, we conclude that behavioural finance is an important factor driving capital structure decisions, and that signalling, as well as market-timing concerns drive share price reactions on the JSE.Contribution: This article highlights the importance of behavioural factors in capital structure decisions and identifies the firm-specific channels through which managerial optimism drives leverage. Additionally, the article sheds light on the role of signalling and market timing in capital structure decisions.
Recruiting for high reliability: attracting safety-minded applicants through language on company webpages

ABSTRACT Objective Job candidates are attracted to companies where they see their values fit in based on clues from recruitment materials. Safety-critical companies may aim to attract safety-minded applicants, through signals indicating that the organisation prioritises safety. Research shows that language related to safety outcomes (versus other outcomes) in recruitment materials can inform the preferences of safety-minded applicants. Rooted in theorising that high reliability organisations (HROs) are highly safety-focused and have low masculinity values, this study investigates the extent to which the relationship between company attractiveness and safety-focused and femininity-focused language used to describe the company, is moderated by potential applicants’ safety attitudes. Method In a within-subjects vignette study, participants (N = 197) rated the attractiveness of four fictitious companies, based on company webpages, and reported on their individual safety attitudes. Results Participants with higher safety attitudes rated companies as more attractive when language used in company descriptions focused on safety (and not business). This effect was amplified when the company description also emphasised low masculinity (i.e., feminine) values. Conclusions To attract applicants with higher safety attitudes, companies may benefit from using language that is focused on femininity, in addition to safety. KEY POINTS What is already known about this topic: (1) Language in recruitment materials can be used to convey informational signals about organisational values. (2) Person-organisation fit (P-O fit) is the compatibility between people and companies when they share similar fundamental characteristics; P-O fit predicts applicant attraction. (3) Using safety-focused language appears to be attractive for applicants who are more safety-minded. What this topic adds: (1) Further evidence that safety-focused language in company descriptions would be attractive to safety-minded applicants. (2) Femininity-focused language is also attractive to safety minded applicants. (3) Femininity- and safety-focused language work together in attracting safety-minded applicants.
Analysis of the Perception of Brazilian Medical Students about Chagas Disease

Considering that health professionals at Brazil had doubts about the entomoepidemiological issues of Chagas disease (CD), and that many of them highlighted not feeling totally safe for clinical care, the knowledge of 281 Brazilian medical students was evaluated through a cross-sectional, descriptive, prospective, and quantitative research. Most students demonstrated that they knew about the etiological agent of CD (Trypanosoma cruzi), since 279 students answered the questionnaire correctly. Furthermore, the medical students demonstrated knowledge of the main form of transmission of the parasite, as 278 students associated CD transmission with triatomines. On the other hand, approximately 25 students did not associate CD transmission with triatomine feces. Besides that, these future health professionals had difficulties in relation to the treatment of CD, as more than half of the students (176) wrongly answered that CD “is not curable” or “is curable in the chronic phase”. Based on the results obtained that point out the difficulties medical students have with CD, there is a need for undergraduate medical courses to address the neglected diseases holistically because the National Curriculum Guidelines for the medical course require the training of competent health professionals capable of integrating the biological, psychological, social, and environmental dimensions.
Nutrition and Flavor Evaluation of Amino Acids in Guangyuan Grey Chicken of Different Ages, Genders and Meat Cuts

Simple Summary Amino acids are the substrate of protein, and also participate in the formation of flavor. Through the type and content detection of amino acid, we obtained information about meat quality characteristics of Guangyuan grey chicken in different groups of age, gender and meat cut. The content of total protein and essential amino acid in pectoral muscle of Guangyuan grey chicken was higher. The amino acid score of most essential amino acids in Guangyuan grey chicken was higher than 100, excluding Leu and Val. The content of free amino acids was higher in 120 d chicken, which was higher in roosters than in hens, and higher in thigh muscle than in pectoralis. These results provide more information for understanding the characteristics of Guangyuan grey chicken. Abstract The composition and content of amino acids in foodstuffs have a vital impact on the nutritional value and taste. With the aim of understanding the nutrition and flavor of Guangyuan grey chicken, the composition and content of amino acids in the pectoralis and thigh muscle of chickens at the age of 90 d, 120 d and 150 d were determine using liquid chromatography–tandem mass spectrometry (LC-MS/MS) and an amino acid analyzer. A total of 17 amino acids were detected both in pectoralis and thigh muscle via the amino acid analyzer, of which the content of glutamate was the highest. Additionally, 21 deproteinized free amino acids were detected via LC-MS/MS. Among all samples, the content of glutamine in thigh muscle was the highest. The content of histidine in the pectoralis was the highest. In terms of the flavor amino acids (FAAs), the umami-taste and sweet-taste amino acids were higher in the thigh muscle of 120 d male chicken. From the perspective of protein nutrition, the essential amino acid was higher in pectoral muscle, and the composition was better. The results of the amino acid score showed that the content of leucine and valine were inadequate in Guangyuan grey chicken. Collectively, the content of amino acid in Guangyuan grey chicken was affected by age, gender and meat cut. This study confirms that meat of chicken in different ages, genders, and cuts presents different nutritional values and flavors owing to the variation of amino acids content.
The Impact of Socioeconomic Status, Perceived Threat and Healthism on Vaccine Hesitancy

The ideology of healthism and low perceptions of the threat of vaccine-preventable diseases may explain the positive link between socioeconomic status (SES) and vaccine hesitancy in high-income countries. The present study aimed to examine the effect of three measures of SES (education, income and family economic status), the perceived threat of infectious diseases and two dimensions of healthism (personal responsibility for own health and distrust in healthcare institutions) on vaccine hesitancy, adjusting for sociodemographic variables. A cross-sectional quantitative study was performed in 2019. Non-probability sampling was employed by sending invitations to respondents over the age of 18 to participate in the study. The snowball technique was used, employing e-mails and digital social networks (Facebook, Twitter and Instagram). Data from 661 respondents were collected via 1 ka.si, an online survey tool. Multivariate regression analysis indicated that vaccine hesitancy was significantly more likely to be expressed by women (β = 0.29; p < 0.001), high-income respondents (β = 0.09; p < 0.01), those who have lower perceptions of the threat of vaccine-preventable diseases (β = 0.39; p < 0.001) and those scoring high on two healthism measures (expressing high perceived control of their own health (β = 0.18; p < 0.001) and high distrust in the Slovenian healthcare system and institutions (β = 0.37; p < 0.001)). The findings indicate that among the examined predictors, low perceived threat of vaccine-preventable diseases and low trust in the healthcare system are among the strongest predictors of vaccine hesitancy among the Slovenian public. Policymakers, physicians and other healthcare workers should be especially attentive to the public’s and patients’ perceptions of the risk of infectious diseases and distrust in medical institutions, including during doctor–patient communication and through public health campaigns and policies.
Parents’ Perception of Staff Support in a Father-Friendly Neonatal Intensive Care Unit

Healthcare professionals, especially nurses, play a central role in supporting parents during their stay in neonatal intensive care units (NICUs). Fathers often have their own support needs; however, studies have shown that these needs are rarely met to the same degree as those of the mothers. We developed a “father-friendly NICU” with the aim of providing good-quality care to the entire family. To evaluate the impact of this concept, we adopted a quasi-experimental design; using the Nurse Parent Support Tool (NPST), we investigated the differences in the fathers’ (n = 497) and mothers’ (n = 562) perception of the nursing support received on admission and discharge between before and after the intervention. In the historical control and intervention groups, the fathers’ median NPST scores at admission were 4.3 (range, 1.9–5.0) and 4.0 (range, 2.5–4.8), respectively (p < 0.0001); at discharge, these scores were 4.3 (range, 1.6–5.0) and 4.4 (range, 2.3–5.0), respectively (difference not significant). In the historical control and intervention groups, the mothers median NPST scores at admission were 4.5 (range, 1.9–5.0) and 4.1 (range, 1.0–4.8), respectively (p < 0.001); at discharge, these scores were 4.4 (range, 2.7–5.0) and 4.4 (range, 2.6–5), respectively (difference not significant). The parental perception of support did not increase after the intervention; however, the parents reported a high level of staff support both before and after the intervention. Further studies should focus on parental support needs during the different phases of hospitalization (i.e., admission, stabilization, and discharge).
Gate-Variable Mid-Infrared Optical Transitions in an Electronic Topological Insulator

We report the first mid-infrared spectroscopy measurement of an electrostatically gated topological insulator, in which we observe several percent modulation of transmittance and reflectance of (Bi1-xSbx)2Te3 films as gating shifts the Fermi level. We combine these optical experiments with transport measurements and ARPES to identify the observed spectral modulation as a combination of gate-variable Pauli-blocking of bulk interband optical transitions at higher energies and modulation of intraband transitions associated with the varying topological surface state (TSS) and bulk free carrier densities at lower energies. We model these phenomena and find a good match to our experimental data. To allow these gated transmittance measurements, a novel epitaxial lift-off method is developed for large-area transfer of TI films from infrared absorbing SrTiO3 growth substrates to thermal oxide on silicon. These results present layered topological insulator materials as a new candidate for tunable infrared optics and demonstrate the possibility of extending the tunable, mid-infrared Dirac plasmons seen in graphene to spin-polarized topological insulator systems.