Abstract The essay analyses a recent ethnography on the repair and maintenance of motorcycles in Romania from the Second World War to the present day. Bearing in mind the very definition of the object, the analytical and conceptual premises of the anthropology of motorcycle culture, the methodological strategies that document it and some of the most significant particularities of the post-Soviet historical context and of “the post-repair society”, it is possible to rethink the apparently technical phenomenon of motorcycle mechanics as an authentic total social fact that modulates a set of geopolitical, economic, technical, identity, symbolic, aesthetic, age and gender variables. In addition, some lines of comparative exploration with other current studies on ethnomechanics, mobilities and particularly the contemporary dissemination of motorcycles in different cultural areas are proposed, which may shed light on the possible relational configurations between technology, environment and society.

Resumen Se analiza una etnografía reciente sobre la reparación y el mantenimiento de motocicletas en Rumania desde la Segunda Guerra Mundial a la actualidad. A partir del detalle de las premisas analíticas y conceptuales del estudio antropológico de la cultura motociclística, de los propios recortes del objeto, de las estrategias metodológicas para documentarlo y de algunas de las particularidades más significativas del escenario histórico de la modernidad postsoviética y “la sociedad de la post-reparación”, se argumenta que es posible repensar el fenómeno aparentemente técnico de la mecánica motociclística como un auténtico hecho social total que modula un set de variables geopolíticas, económicas, técnicas, identitarias, simbólicas, estéticas, etarias y de género. Finalmente, se proponen algunas líneas posibles de exploración comparativa con otros estudios actuales sobre etnomecánica, movilidades y en particular la difusión contemporánea de motocicletas en áreas culturales muy distintas entre sí, que echan luz sobre las configuraciones relacionales posibles entre tecnología, medioambiente y sociedad.

ABSTRACT Objective: To compare and analyze pulmonary function and respiratory mechanics parameters between healthy children and children with cystic fibrosis. Methods: This cross-sectional analytical study included healthy children (HSG) and children with cystic fibrosis (CFG), aged 6–13 years, from teaching institutions and a reference center for cystic fibrosis in Florianópolis/SC, Brazil. The patients were paired by age and sex. Initially, an anthropometric evaluation was undertaken to pair the sample characteristics in both groups; the medical records of CFG were consulted for bacterial colonization, genotype, and disease severity (Schwachman-Doershuk Score — SDS) data. Spirometry and impulse oscillometry were used to assess pulmonary function. Results: In total, 110 children were included, 55 in each group. In the CFG group, 58.2% were classified as excellent by SDS, 49.1% showed the ΔF508 heterozygotic genotype, and 67.3% were colonized by some pathogens. Statistical analysis revealed significant differences between both groups (p<0.05) in most pulmonary function parameters and respiratory mechanics. Conclusions: Children with cystic fibrosis showed obstructive ventilatory disorders and compromised peripheral airways compared with healthy children. These findings reinforce the early changes in pulmonary function and mechanics associated with this disease. Objective Methods crosssectional cross sectional HSG (HSG CFG, , (CFG) 613 6 13 6–1 years FlorianópolisSC Florianópolis SC Florianópolis/SC Brazil sex Initially colonization genotype SchwachmanDoershuk Schwachman Doershuk SDS data Results total 11 5 group 582 58 2 58.2 491 49 1 49.1 ΔF ΔF50 673 67 3 67.3 pathogens p<0.05 p005 p 0 05 (p<0.05 Conclusions (CFG 61 6– 58. 4 49. ΔF5 67. p<0.0 p00 (p<0.0 p<0. p0 (p<0. p<0 (p<0 p< (p< (p

RESUMO Objetivo: Comparar e analisar parâmetros de função pulmonar e de mecânica respiratória entre escolares saudáveis e com fibrose cística (FC). Métodos: Estudo transversal que incluiu escolares saudáveis (GES) e com FC (GFC), com idades entre seis e 13 anos, provenientes de instituições de ensino e de um centro de referência da FC em Florianópolis/SC, Brasil, pareados por idade e sexo, respectivamente. Inicialmente, conduziu-se avaliação antropométrica para pareamento e caracterização de ambos os grupos e, no GFC, consultou-se prontuário médico para registro dos dados de colonização bacteriana, genótipo e gravidade da doença (Escore de Schwachman-Doershuk — ESD). Para a avaliação da função pulmonar, realizou-se espirometria e a avaliação da mecânica respiratória foi conduzida por meio do sistema de oscilometria de impulso. Resultados: Participaram 110 escolares, 55 em cada grupo. No GFC, 58,2% foram classificados pelo ESD como excelentes, 49,1% apresentaram genótipo ∆F508 heterozigoto e 67,3% eram colonizados por alguma patógeno. Houve diferença significativa (p<0,05) na maioria dos parâmetros de função pulmonar e de mecânica respiratória entre os grupos. Conclusões: Escolares com FC apresentaram distúrbio ventilatório obstrutivo e com comprometimento de vias aéreas periféricas, em comparação aos escolares hígidos. Esse evento reforça o início precoce da alteração de função pulmonar e de mecânica respiratória nessa enfermidade, evidenciados pelos achados desta investigação. Objetivo FC. . (FC) Métodos GES (GES GFC , (GFC) 1 anos FlorianópolisSC Florianópolis SC Florianópolis/SC Brasil sexo respectivamente Inicialmente conduziuse conduziu se consultouse consultou bacteriana Escore SchwachmanDoershuk Schwachman Doershuk ESD. ESD) realizouse realizou impulso Resultados 11 5 grupo 582 58 2 58,2 excelentes 491 49 49,1 F508 F ∆F50 673 67 3 67,3 patógeno p<0,05 p005 p 0 05 (p<0,05 Conclusões periféricas hígidos enfermidade investigação (FC (GFC 58, 4 49, F50 ∆F5 6 67, p<0,0 p00 (p<0,0 F5 ∆F p<0, p0 (p<0, p<0 (p<0 p< (p< (p

Abstract The need to develop several students’ competencies is one of the leading challenges for Engineering instructors in undergraduate courses. It has been quite exhausting in many cases, mainly due to the lack of professors’ expertise in engineering education. Case studies may provide examples and help develop professors’ ability to design effective learning experiences. In this context, this paper presents a case study of implementing an in-class/ex-class activity conducted in the Soil Mechanics-I course at the Federal University of Rio Grande do Norte. Additionally, it aims to discuss students’ perception regarding development of the proposed activity and competences. The activity comprised three phases: selection of Geotechnical Engineering problems on university campus, documentation and analysis of each situation, and presentation of solutions considering technical, environmental, and social aspects. Students' perceptions were assessed using an anonymous online survey (18 Likert and open-ended questions), divided into three categories: general impressions, competencies development, and open statements. General impressions and competencies development were mostly positive, with deadlines reported as the most challenging aspect. Open questions responses provided positive feedback, emphasizing the main developed competencies, according to students’ perspective (e.g. leadership, interpersonal relationship, and analytical view of the problem). The need of dealing with real problems and work in groups appears to be a successful approach for teaching Geotechnical Engineering courses and developing competences in Engineering undergraduate courses. This case study can support innovation in teaching any engineering course and help students face future professional challenges. cases professors education experiences context inclass/exclass inclassexclass class/ex class ex MechanicsI Mechanics I Norte Additionally phases campus situation technical environmental aspects Students 18 (1 openended ended questions, , questions) categories statements aspect feedback e.g. eg e g (e.g leadership relationship problem. problem . problem) inclass exclass classex 1 ( e.g

This article explores the use of the Sturm-Liouville operator in the spectral representation of the Green’s function, highlighting its applicability in mathematical physics. We focus on spectral representation as a technique for solving non-homogeneous differential equations, using the eigenfunctions of the Sturm-Liouville operator. We demonstrate the application of these concepts in fundamental problems of electromagnetism, and quantum mechanics, obtaining analytical solutions and revisiting concepts. We highlight the use of Python programming for the graphical visualization of solutions, facilitating the understanding of complex mathematical concepts and offering an intuitive approach to the analysis of physical phenomena. In the final section, we emphasize how the work provides valuable insights for the solution of differential equations and the interpretation of physical phenomena. We conclude by pointing to future work, suggesting an even deeper integration between programming and mathematics in contemporary physics, with the goal of making learning more intuitive. SturmLiouville Sturm Liouville Greens Green s function physics nonhomogeneous non homogeneous electromagnetism mechanics phenomena section

Este artigo explora o uso do operador de Sturm-Liouville na representação espectral da função de Green, destacando sua aplicabilidade em física matemática. Focamos na representação espectral como uma técnica para resolver equações diferenciais não-homogêneas, utilizando as autofunções do operador de Sturm-Liouville. Demonstramos a aplicação desses conceitos em problemas fundamentais de eletromagnetismo e mecânica quântica, obtendo soluções analíticas e revisitando conceitos. Destacamos o uso da programação em Python para visualização gráfica das soluções, facilitando a compreensão de conceitos matemáticos complexos e oferecendo uma abordagem intuitiva para a análise de fenômenos físicos. Na seção final, enfatizamos como o trabalho proporciona insights valiosos para a solução de equações diferenciais e interpretação de fenômenos físicos. Concluímos apontando para trabalhos futuros, sugerindo uma integração ainda mais profunda entre programação e matemática na física contemporânea, com o objetivo de tornar o aprendizado mais intuitivo. SturmLiouville Sturm Liouville Green nãohomogêneas, nãohomogêneas não homogêneas, homogêneas não-homogêneas SturmLiouville. Liouville. quântica físicos final futuros contemporânea intuitivo

RN104 (2-[2-(cyclohexylmethylene)hydrazinyl]-4-phenylthiazole) is a thiazolylhydrazone derivative with promising in vitro and in vivo antifungal activity. A stability indicating highperformance liquid chromatography with diode-array detection (HPLC-DAD) method was carried out using C18 end-capped column (250 × 4.6 mm, 5 μm) and a mobile phase composed of water and acetonitrile (15:85 v/v) at a flow rate of 1.2 mL min-1, injection volume 25 μL and DAD detection at 240 nm. The method showed to be selective, linear in the range of 20 to 240 μg mL-1, precise, accurate and robust. RN104 forced degradation study under different stress conditions (acidic, alkaline and neutral hydrolysis, oxidation, photolysis and thermolysis) was performed using the validated analytical method. The results showed that RN104 underwent significant degradation when subjected to alkaline hydrolysis and oxidation by metallic ions. Quantum mechanics calculations were carried out to assist in the structural elucidation of the formed degradation products. The obtained data may be useful for the development of future formulation based on RN104. RN RN10 22cyclohexylmethylenehydrazinyl4phenylthiazole cyclohexylmethylenehydrazinylphenylthiazole 2 cyclohexylmethylene hydrazinyl 4 phenylthiazole (2-[2-(cyclohexylmethylene)hydrazinyl]-4-phenylthiazole activity diodearray diode array HPLCDAD HPLC (HPLC-DAD C C1 endcapped end capped 250 (25 46 6 4. mm μm 1585 15 85 (15:8 v/v vv v 12 1 1. min1, min1 min 1, min-1 24 nm selective mL1, mL1 mL-1 precise robust acidic, acidic (acidic thermolysis ions products RN1 cyclohexylmethylenehydrazinyl (2 158 8 (15: min- mL- ( (15 (1

We provide a pedagogical calculation of the first two spacing distribution for a spin-1/2 XX chain in the presence of an external magnetic field. The results obtained from analytical expressions are compared with those from extensive quantum Monte Carlo simulations. The results obtained for the spacing distributions are used to describe the magnetic behavior of the system and contrasted with the standard analysis based on quantities such as the average energy, magnetization, and susceptibility. Finally, the equivalence between the analytical expressions for the spacing distributions provided by the second quantization formalism and those from the inter-particle distribution method is illustrated. As shown, the spacing distributions can be used as pedagogical examples of the use of the second quantization formalism in introductory courses of quantum statistical mechanics. Additionally, these distributions can be calculated easily from quantum Monte Carlo simulation and, therefore, can be used to illustrate this numerical method. spin1/2 spin12 spin 1/2 1 2 spin-1/ field simulations energy magnetization susceptibility Finally interparticle inter particle illustrated shown mechanics Additionally therefore spin1 spin1/ 12 1/ spin-1 spin-

We address two questions regarding square-well potentials from a didactic perspective. The first question concerns whether or not the justification of the standard a priori omission of the potential’s vertical segments in the analysis of the eigenvalue problem is licit. The detour we follow to find out the answer considers a trapezoidal potential, includes the solution, analytical and numerical, of the corresponding eigenvalue problem and then analyzes the behavior of that solution in the limit when the slope of the trapezoidal potential’s ramps becomes vertical. The second question, obviously linked to the first one, pertains whether or not eigenfunction’s and its first derivative’s continuity at the potential’s jump points is justified as a priori assumption to kick-off the solution process, as it is standardly accepted in textbook approaches to the potential’s eigenvalue problem. We show that, by following the indicated detour, the irrelevance of the potential’s vertical segments and the continuity of eigenfunctions and their first derivatives at the potential’s jump points turn out to be proven results instead of initial assumptions. squarewell square well perspective potential s licit numerical one eigenfunction derivative kickoff kick off process assumptions

Abstract Recently several studies have explored the limits and possibilities of videogames as expression of globalized cultural industry but also as a resistance point to capitalism. However, these conceptualizations often omit fundamental features of videogames as apparatuses (dispositifs) or assemblages (agencements) of contemporary societies as well as their relations with modes of subjectification forged in engagement (refrain). Our proposal will recover the elements that allow videogames to be studied as condensation of sign regimes (images) and materialities by identifying the lines (molecular, molar and abstract) that compose (re/ territorialize) digital video game assemblages (intensive semiotics of spatiality, mechanics and gameplay), as well as their possible lines of flight (deterritorialization). Likewise, if our analytical model finds its theoretical foundations in French post-structuralism, this paper will rely on the main contributions of applied ludology. Therefore, our paper will present a empirical analysis (comparative grids) on a corpus of 45 developments produced between 2010 and 2016 in Global Game Jams of the city of Santa Fe.

Resumen En los últimos años diversos estudios han abordado los límites y posibilidades de los videojuegos como expresión cabal de la industria cultural globalizada pero también como frontera resistente al capitalismo. No obstante, estas conceptualizaciones suelen omitir los rasgos fundamentales de los videojuegos como dispositivos o agenciamientos de las sociedades contemporáneas así como sus relaciones con los modos de subjetivación forjados en el engagement (ritornelo). Nuestra propuesta buscará recuperar los elementos que permiten pensar a los videojuegos como condensación de regímenes de signos (imágenes) y materialidades identificando las líneas (moleculares, molares y abstractas) que componen (re/territorializan) a los agenciamientos de juego digital (semióticas intensivas de la espacialidad, de las mecánicas y de la gameplay), así como sus posibles líneas de fuga (desterritorializaciones). Asimismo, si el modelo analítico encuentra sus fundamentos teóricos en el posestructuralismo francés, la investigación se apoyará en los principales aportes de la ludología aplicada. Por ello nuestro escrito estará basado en recorridos empíricos (grillas comparativas) sobre un corpus de 45 videojuegos producidos entre 2010 y 2016 en las Global Game Jams de la ciudad de Santa Fe.

Resumo Nos últimos anos, vários estudos abordaram os limites e as possibilidades dos video games como uma verdadeira expressão da indústria cultural globalizada, mas também como uma fronteira resistente ao capitalismo. Contudo, essas construções teóricas geralmente omitem as características fundamentais dos video games como dispositivos ou agenciamientos das sociedades contemporâneas, bem como suas relações com os modos de subjetivação forjados no engagement (ritornelo). Nossa proposta buscará recuperar os elementos que permitem que os video games sejam vistos como condensação de regimes de signos (imagens) e materialidades, identificando as linhas (moleculares, molares e abstratas) que compõem (re/territorializam) as agenciamientos de jogos digitais (espacialidade, mecânica e gameplay), bem como suas possíveis linhas de fuga (desterritorialização). Além disso, se o modelo analítico encontre seus fundamentos teóricos no pós-estruturalismo francês, a pesquisa contará com as principais contribuições da ludologia aplicada. Portanto nosso artigo será baseado em experiências (quadros comparativos) em um corpus de 45 video games produzidos entre 2010 e 2016 nas Global Game Jams da cidade de Santa Fe.

RESUMO Objetivo: Analisar a influência da mechanical power e de seus componentes na ventilação mecânica em SARS-CoV-2; identificar os valores dos componentes da ventilação mecânica e verificar suas correlações entre si e com a mechanical power e efeitos sobre o resultado das fórmulas de Gattinoni-S e Giosa. Métodos: Estudo observacional, longitudinal, analítico e quantitativo dos parâmetros do respirador e da mechanical power no SARS-CoV-2. Resultados: A mechanical power média foi de 26,9J/minuto (Gattinoni-S) e 30,3J/minuto (Giosa). A driving pressure foi de 14,4cmH2O, a pressão de platô de 26,5cmH2O, a pressão expiratória positiva final 12,1cmH2O, a elastância de 40,6cmH2O/L, o volume corrente foi de 0,36L e a frequência respiratória de 32/minuto. A correlação entre as fórmulas de Gattinoni e de Giosa foi de 0,98, com viés de -3,4J/minuto e diferença na correlação da pressão de resistência de 0,39 (Gattinoni-S) e 0,24 (Giosa). Entre os componentes, destacaram-se as correlações da elastância com a driving pressure (0,88), pressão expiratória positiva final (-0,54) e volume corrente (-0,44). Conclusão: Na análise da ventilação mecânica da SARS-CoV-2, constatou-se que as correlações de seus componentes com a mechanical power influenciaram em seus valores momentâneos elevados, e que as correlações de seus componentes entre si influenciaram em seu comportamento ao longo do tempo. Por possuírem efeitos específicos sobre as fórmulas de Gatinnoni-S e Giosa, os componentes da ventilação mecânica tiveram influência em seus cálculos e causaram divergências nos valores da mechanical power.

ABSTRACT Objective: To analyze the influence of mechanical power and its components on mechanical ventilation for patients infected with SARS-CoV-2; identify the values of the mechanical ventilation components and verify their correlations with each other and with the mechanical power and effects on the result of the Gattinoni-S and Giosa formulas. Methods: This was an observational, longitudinal, analytical and quantitative study of respirator and mechanical power parameters in patients with SARS-CoV-2. Results: The mean mechanical power was 26.9J/minute (Gattinoni-S) and 30.3 J/minute (Giosa). The driving pressure was 14.4cmH2O, the plateau pressure was 26.5cmH2O, the positive end-expiratory pressure was 12.1cmH2O, the elastance was 40.6cmH2O/L, the tidal volume was 0.36L, and the respiratory rate was 32 breaths/minute. The correlation between the Gattinoni and Giosa formulas was 0.98, with a bias of -3.4J/minute and a difference in the correlation of the resistance pressure of 0.39 (Gattinoni) and 0.24 (Giosa). Among the components, the correlations between elastance and driving pressure (0.88), positive end-expiratory pressure (-0.54) and tidal volume (-0.44) stood out. Conclusion: In the analysis of mechanical ventilation for patients with SARS-CoV-2, it was found that the correlations of its components with mechanical power influenced its high momentary values and and that the correlations of its components with each other influenced their behavior throughout the study period. Because they have specific effects on the Gatinnoni-S and Giosa formulas, the mechanical ventilation components influenced their calculations and caused divergence in the mechanical power values.

RESUMEN Este artículo describe un método analítico para el análisis de elementos viga-columna con condiciones de borde generalizadas apoyadas en una fundación elástica Pasternak homogénea o no-homogénea. La formulación matemática utilizada en este documento es una presentada recientemente por el autor principal. La ecuación diferencial (ED) que gobierna el comportamiento del elemento viga-columna se resuelve utilizando el método de transformación diferencial (DTM). Para el modelo estructural propuesto, el DTM ofrece ventajas prácticas sobre otros métodos. La formulación propuesta proporciona la flexibilidad de tener en cuenta i) carga lateral y axial combinada en los extremos del elemento, ii) suelo homogéneo o no-homogéneo, iii) fundación elástica Pasternak, y iv) una carga transversal arbitraria externa que actúa a lo largo del elemento. Los efectos de varias relaciones de esbeltez, relaciones de rigidez y condiciones de borde clásicas e intermedias se pueden estudiar fácilmente con la formulación propuesta. Se presentan ejemplos para validar la precisión del modelo y su aplicabilidad en una amplia gama de análisis.

ABSTRACT This paper describes an analytical approach to conduct an analysis of beam-column elements with generalized end-boundary conditions on a homogeneous or non-homogeneous Pasternak elastic foundation. The mathematical formulation utilized herein is that presented by the senior author in a recent work. The differential equation (DE) governing the behavior of the beam-column element is solved using the differential transformation method (DTM). The DTM offers practical advantages over other conventional approaches when solving the proposed structural model. The proposed formulation provides the flexibility to account for i) combined lateral and axial load at the ends of the element, ii) homogeneous or non-homogeneous soil, iii) Pasternak elastic foundation, and iv) an external arbitrary transverse load acting on the element. The effects of various slenderness ratios, pile-soil stiffness ratios, and classical and semirigid boundary conditions can be easily studied with the proposed formulation. Examples are presented to validate the accuracy of the model and its applicability over a wide range of analyses.

Abstract The concept of a Magnetic Resonance Imaging (MRI) device is based on the emission of radio waves produced by the protons of the hydrogen atoms in water molecules when placed in a constant magnetic field after they interact with a pulsed radio frequency (RF) current. When the RF field is turned on, the protons are brought to a spin excited state. When the RF field is turned off, the MRI sensors are able to detect the energy released as the protons realign their spins with the magnetic field. In this work we provide a simple model to describe the basic physical mechanism responsible for the operation of MRI devices. We model the water molecule in terms of a central force problem, where the protons move around the (unstructured) doubly negatively charged oxygen atom. First, we employ an analytical treatment to obtain the system’s wave function as well as its energy levels, which we show are degenerate. Next, the energy levels from the water molecule are studied in the presence of a uniform external magnetic field. As a result, they get shifted and the degeneration is lifted. We provide numerical results for a magnetic field strength commonly used in MRI devices.

Abstract In this paper, we investigate the new approximate bound state solution of deformed Klein-Gordon, Dirac and Schrödinger equations in the symmetries of extended relativistic quantum mechanics ERQM and extended nonrelativistic quantum mechanics ENRQM have been obtained with a newly proposed potential called improved Hellmann-generalized Morse potential (IHGMP, for short). To the best of our knowledge, this problem is examined in literature in the usual RQM and NRQM with Hellmann-generalized Morse potential. The potential is a superposition of Hellmann potential, generalized Morse or Deng-Fan potential, and some other exponential terms. By employing the improved approximation to deal with the centrifugal term, Bopp’s shift and standard perturbation theory method. The new approximate analytical energy shift and the corrections of bound state energy eigenvalues in ERQM and ENRQM are obtained for some selected diatomic molecules such as (HCl, LiH, H2, ScH, TiH, VH, CrH, CuLi, TiC, NiC, ScN and ScF). The new values that we get are sensitive to the quantum numbers (j,l,s,m), the potential depths of the improved Hellmann-generalized Morse potential (α,b), the range of the potential α, the dissociation energy D e , the equilibrium bond length r e , and noncommutativity parameters(Θ,σ,χ). We have highlighted three physical phenomena that automatically generate a result of the topological properties of noncommutativity, the first physical phenomena are the perturbative spin-orbit coupling, the second the magnetic induction while the third corresponds to the rotational proper phenomena. In both relativistic and nonrelativistic problems, we show that the corrections on the spectrum energy are smaller than the main energy in the ordinary cases of quantum field theory and quantum mechanics. In the new symmetries of NCQM, it is not possible to get the exact analytical solutions for l = 0 and l ≠ 0, the approximate solutions are available. Four special cases, i.e., l wave are investigated in the context of deformed Klein-Gordon and Schrödinger theories. The relativistic energy equations and the new nonrelativistic energy for some potentials such as improved Hellmann potential and improved generalized Morse potential have also been obtained by varying some potential parameters. We have clearly shown that the Schrödinger and Klein Gordon equations in the new symmetries can physically describe each of the two Dirac equations and the Duffin-Kemmer equation under the effect of IHGMP.

Abstract Both analytical and numerical methods have proven to be suitable for describing radiation transport and interactions. The standard Boltzmann formalism derived from statistical mechanics requires to be specifically re-formulated to account for the interactions with external electromagnetic fields. Verifying the proper implementation of the external electromagnetic field coupling in Monte Carlo simulation codes is a key issue to confirm the feasibility of using such a tool to describe complex applications like image-guided radiotherapy based on integrating magnetic resonance scanner to the radiant field of ionizing radiation along with the subsequent dosimetric effects. The present work reports on the feasibility and reliability of the Monte Carlo FLUKA and PENELOPE main codes to assess electron trajectory in presence of strong magnetic fields. The obtained results confirm the ability of FLUKA and PENELOPE to model the alterations in the electron trajectories due to external magnetic field effects, also demonstrating an excellent agreement between both codes and with the theoretical-analytical model.

Resumen El transporte y colisión de radiación puede describirse tanto por métodos analíticos como numéricos. El formalismo estándar de Boltzmann derivado de la mecánica estadística requiere reformulaciones específicas para contemplar la interacción con campos electromagnéticos externos. La verificación de la correcta implementación del acoplamiento con campos electromagnéticos externos en códigos de simulación Monte Carlo es de particular relevancia para confirmar la viabilidad del uso de esta herramienta para describir aplicaciones complejas como radioterapia guiada por imágenes integrando escáner de resonancia magnética al campo radiante de radiación ionizante con los consecuentes efectos dosimétricos. El presente trabajo reporta sobre la factibilidad y fiabilidad de los códigos Monte Carlo FLUKA y PENELOPE para describir la trayectoria de electrones implementando el acoplamiento con campos magnéticos intensos. Los resultados obtenidos confirman la capacidad de FLUKA y PENELOPE para modelar las alteraciones en las trayectorias de electrones por efecto de campo magnético externo, demostrando además un excelente acuerdo entre ambos códigos y con el modelo teórico-analítico utilizado.

Most aeronautical accidents happen during takeoff and landing. The main objective when studying those phases of the flight mission is to answer a seemingly simple questions: can the airplane safely takeoff and land on the stipulated runway dimensions with the intended weight? The main objective of the present paper is to obtain new analytical answer to those questions, for fixed wing airplanes. To our present knowledge such a solution, with the degree of generalisation proposed here, is new in the literature. Regarding previous studies, first a new power unit traction equation is employed to explicitly consider the influence of air density, angular velocity and diameter of the propeller. Then a new method for calculating the maximum weight is proposed. Next, the use of breaks is modeled and analysed and an equation to calculate the static gliding wind velocity is proposed. Finally, a toolbox created to perform the calculations is described. A thorough analysis of the influence of the airplane design parameters on the behavior of the motion equations is made, with special attention to the use of brakes. Numerical results are successfully compared with experimental data from two models of a commercial airplane, the Cessna 172 Skyhawk models N and S, and four UAV prototypes. The methodology employed uses simple laws of classical mechanics allied to basic calculus and is easy to understand by first year students of physics, engineering or mathematics.

Abstract In this research work, within the framework of relativistic and nonrelativistic noncommutative quantum mechanics, the deformed KleinGordon and Schrödinger equations were solved with the modified equal vector scalar Manning-Rosen potential that has been of significance interest in recent years using Bopp’s shift method and standard perturbation theory in the first-order in the noncommutativity parameters (Θ,σ,χ) in 3-dimensions noncommutative quantum mechanics. By employing the improved approximation of the centrifugal term, the relativistic and nonrelativistic bound state energies were obtained for some diatomic molecules such as (HCl, CH, LiH, CO, NO, O2, I2, N2, H2, and Ar2). The obtained energy eigenvalues appear as a function of the generalized Gamma function, the parameters of noncommutativity, and the parameters (β,A,α) of studied potential, in addition to the atomic quantum numbers (n,j,l,s,m). In both relativistic and nonrelativistic problems, we show that the corrections on the spectrum energy are smaller than the main energy in the ordinary cases of RQM and NRQM. A straightforward limit of our results to ordinary quantum mechanics shows that the present result is consistent with what is obtained in the literature. We have seen that the improved approximation of the centrifugal term is better than the other approximations in finding the approximate analytical solutions of the Klein-Gordon and Schrödinger equations for the modified Manning-Rosen potential in relativistic noncommutative quantum mechanics and nonrelativistic noncommutative quantum mechanics.