bluuebunny/crossref_metadata_2025 huggingface dataset:
Boosted Incremental Nonlinear Dynamic Inversion for Flexible Airplane Gust Load Alleviation
Authors: Beyer Yannic , Steen Meiko , Hecker Peter
Published: April 2024

Active gust load alleviation is an important technology for reducing loads on future commercial airplanes so that the structure can be designed to be lighter in order to save fuel. For the intense reduction of gust loads, a highly reactive control system of sensors, control algorithms, and actuators is required, which is not yet available. In this paper, a control algorithm based on incremental nonlinear dynamic inversion is extended so that actuators respond faster. The control algorithm is applied to a future medium-range aircraft with distributed trailing-edge flaps. It is assumed that the vertical acceleration of the center of gravity and the displacement, velocity, and acceleration of the first wing bending mode are available as feedback variables. To allow comparability with other actuator and sensor setups, the authors abstract the actuator dynamics and sensor filter as control system time delay. The feedback gains are adjusted automatically to the control system time delay. In simulation, the authors investigate the influence of the control system time delay on the peak gust loads. They show that gust loads can indeed be intensely reduced with sufficiently small control system time delay in simulation.
Explainable Basic-Fighter-Maneuver Decision Support Scheme for Piloting Within-Visual-Range Air Combat
Authors: Wang Can , Tu Jingqi , Yang Xizhong , Yao Jun , Xue Tao , Ma Jinyi , Zhang Yiming , Ai Jianliang , Dong Yiqun
Published: April 2024

In within-visual-range (WVR) air combat, basic fighter maneuvers (BFMs) are widely used. A BFM decision support scheme has been proposed to aid human pilots in the complex air combat engagement. Recent artificial intelligence advances provide novel opportunities for the development of BFM decision support research. This paper commences by establishing an air-combat-engagement database. Key features that pilots rely on for BFM decision-making in WVR air combat are analyzed, which identifies the input and output data essential for the development of the BFM decision support scheme. A Long Short-Term-Memory (LSTM)-based BFM decision support scheme is then proposed to map input (i.e., combat situations) to output (i.e., BFM decision). Additionally, Shapley-Additive-Explanations-based explainability analysis is also employed to assess the importance of each input feature in the LSTM blocks, and to explain the contribution of each feature to the BFM decision. To evaluate the effectiveness of the proposed BFM decision support scheme, WVR air-combat tests are conducted, which justify the effectiveness of the proposed scheme.
Aeroelastic Scaling of a High-Aspect-Ratio Wing Incorporating a Semi-Aeroelastic Hinge
Authors: Gu Huaiyuan , Healy Fintan , Constantin Lucian , Rezgui Djamel , Lowenberg Mark , Cooper Jonathan E. , Wilson Thomas , Castrichini Andrea
Published: April 2024

There has been a growing interest in utilizing flared folding wingtips as an in-flight load alleviation device to enable increased wing spans that meet airport gate limits but with little increase in wing weight. The semi-aeroelastic hinge (SAH) concept is implemented in high-aspect-ratio wings to enable wingtips to be released during severe load cases such as maneuvers and gusts to alleviate the bending moments while maintaining optimum aerodynamic shape for the rest of the flight. In this paper, scaling methods for wings incorporating the SAH are explored, allowing for the development of equivalent scaled unmanned aerial vehicles or wind tunnel models with similar aeroelastic behavior as full-size aircraft. Three scaling approaches are considered in this study, namely, Iso-Froude, Iso-Frequency, and Iso-Strain, where a set of governing nondimensional quantities and scaling factors are determined. Despite the significant nonlinearities resulting from large wingtip fold angles, it is shown that a linear scaling approach can be appropriate for such a wing configuration. Furthermore, the aeroelastic properties of each scaled model are compared to those of the full-scale model, where the best match was obtained from the Iso-Strain model, although it is challenging to meet the required operational conditions.
Miliary tuberculosis in an immunocompetent patient: Case report
Authors:   Clínica San Pablo, Valle Farfan Renzo S. , Peña Villalobos Alejandro M. ,   Clínica San Pablo, Espinoza Hernandez Walter J. ,   Clínica San Pablo, Valle Farfan Steffano A. ,   Universidad Científica del Sur
Published: April 2024

Milar Tuberculosis (TB) is a presentation with a fatal outcome if it is not diagnosed or treated on time; although certain conditions are required to develop this presentation. In this In this article, the case of a 48-year-old man with no pathological history is studied, who started the disease with a time of six months with an initial diffuse gastrointestinal pain and later one month before admission presented progressive respiratory symptoms; he was admitted for emergencies where bilateral diffuse miliary compromise was evident in the chest computed tomography; upon admission, he was administered oxygen and support measures, an HIV test was obtained which was negative, and positive results were obtained in the sputum smear microscopy. His clinical evolution was stationary until the administration of antituberculosis therapy, observing slight clinical improvement, likewise, low doses of corticosteroids were administered after which a favorable evolution was demonstrated and he was discharged.
Hyperglycemia as a risk factor for in-hospital mortality in myocardial infarction
Authors:   Universidad Nacional Mayor de San Marcos, Barrantes-Alarcon Ciro , Fernández-Coronado Rosalia ,   Universidad Nacional Mayor de San Marcos, Olortegui-Yzu Adriel ,   Universidad Nacional Mayor de San Marcos
Published: April 2024

Introduction: Myocardial infarction continues with high mortality rates, from 4.6% to 13.1%. There are predictive risk stratification models, such as the Grace Score, which does not include glycemia as a variable. Patients hospitalized for myocardial infarction with hyperglycemia on admission may have higher mortality, in ST elevated and non-elevated infarcts. Objectives: The objective of this review is to identify and systematize the evidence on hyperglycemia on admission as a biomarker of mortality and heart failure in acute myocardial infarction. Materials and Methods: The search was carried out in the MEDLINE database including the MeSH terms hyperglycemia and hospital mortality or heart failure in myocardial infarction, selecting 12 articles. Results: Hospital mortality was calculated in 11 articles, in 9 of them a significant association was found between hyperglycemia and hospital mortality, both in the bivariate and multivariate analysis, and in 2 articles this association was not demonstrated. For in-hospital mortality, the results of 11 articles included in this review were synthesized. The frequency of occurrence of heart failure was determined in 11 articles, finding a higher frequency in 9 of them. For in-hospital mortality, the results of 11 articles included in this review were synthesized and analyzed, in 8 the analysis was performed in non-diabetics, obtaining OR: 4.15, IC 95% (2.853-6.035), in 3 for diabetics obtaining OR 2.365 IC 95% (1.778- 3,146) and in 6 for the total population finding OR 3,314 (2,910-3,774). Conclusions: Hyperglycemia on admission is associated with increased mortality and frequency of occurrence of heart failure during hospitalization for myocardial infarction, with evidence of moderate quality.
The Smallest Worthwhile Effect on Pain Intensity of Exercise Therapy for People With Chronic Low Back Pain: A Discrete Choice Experiment Study
Authors: Hansford Harrison J. , Jones Matthew D. , Cashin Aidan G. , Ostelo Raymond W.J.G. , Chiarotto Alessandro , Williams Sam A. , Sharma Saurab , Rose John M. , Devonshire Jack J. , Ferraro Michael C. , Wewege Michael A. , McAuley James H.
Published: April 2024

OBJECTIVE: To identify the smallest worthwhile effect (SWE) of exercise therapy for people with nonspecific chronic low back pain (CLBP).

DESIGN: Discrete choice experiment

METHODS: The SWE was estimated as the lowest reduction in pain that participants would consider exercising worthwhile, compared to not exercising, ie, effects due to natural history and other components (eg, regression to the mean). We recruited English-speaking adults in Australia with nonspecific CLBP to our online survey via e-mail obtained from a registry of previous participants and advertisements on social media. We used discrete choice experiment to estimate the SWE of exercise compared to no exercise for pain intensity. We analyzed the discrete choice experiment using a mixed logit model and mitigated hypothetical bias through certainty calibration, with sensitivity analyses performed with different certainty calibration thresholds.

RESULTS: Two hundred and thirteen participants completed the survey. The mean age (±standard deviation [SD]) was 50.7±16.5, median (interquartile range) pain duration 10 years (5-20), and mean pain intensity (±SD) was 5.8±2.3 on a 0-to-10 numerical rating scale. For people with CLBP, the SWE of exercise was a between-group reduction in pain of 20%, compared to no exercise. In the sensitivity analyses, the SWE varied with different levels of certainty calibration, from 0% without certainty calibration to 60% with more extreme certainty calibration.

CONCLUSION: This patient-informed threshold of clinical importance could guide the interpretation of findings from randomized trials and meta-analyses of exercise therapy compared to no exercise. J Orthop Sports Phys Ther 2024;54(7):477-485. Epub 17 April 2024. doi:10.2519/jospt.2024.12279
Determination of molecular types and resistance to macrolides in Treponema pallidum isolates isolated in the Russian Federation
Authors: Obraztsova Olga A. , Lagun Kseniya M. , Katunin Georgii L. , Shpilevaya Marina V. , Nosov Nikita Y.
Published: April 2024

Background. The number of syphilis cases in the Russian Federation increased significantly in 2022. Control of heterogeneity of Treponema pallidum subtypes is important to monitor the emergence and spread of antibiotic-resistant strains
Aims. To determine molecular subtypes and resistance to macrolides in T. pallidum isolates isolated in the Russian Federation in 2022.
Methods. We analyzed DNA isolated from 49 samples of clinical material obtained from patients from dermatovenerological treatment and prevention facilities in three federal districts (CFD, SFD, SCFD) of the Russian Federation in 2022 with diagnoses of primary syphilis and secondary syphilis. T. pallidum DNA isolation and confirmation of the presence of genetic material were performed according to the existing algorithms. To search for genetic determinants of resistance to macrolides, a fragment of the 23S rRNA gene was analyzed. Primary decoding of nucleotide sequences was performed in Sequencing Analysis 5.3.1. Mega 11 program was used to align the analyzed fragments of target genes to T. pallidum reference sequences.
Results. In 2022, three subtypes of T. pallidum were identified in the territory of the represented federal districts of the Russian Federation: 14d/f, 14d/g, 14d/d with continued dominance of subtype 14d/f. The macrolide-resistant subtype 14d/d was identified in two federal districts, which is new for the Russian Federation.
Conclusions. The population of T. pallidum continues to expand in the Russian Federation, including the emergence of azithromycin-resistant strains. The data obtained confirm the need for continuous monitoring of circulating strains and may facilitate understanding of their geographic distribution.
Lymphomatoid papulosis. Case in pediatric dermatological clinical practice
Authors: Zaslavsky Denis V. , Gorlanov Igor A. , Belousova Irena E. , Bolshakova Elena S. , Artykova Anna A. , Nekrasova Albina S. , Lyamina Ekaterina A. , Kozlova Daria V.
Published: April 2024

A clinical case of lymphomatoid papulosis in a 10-year-old boy is described, clinically characterized by the presence of ulcerating nodes that resolve with the atrophy formation. The patient’s differential diagnostic workup included cutaneous anaplastic large cell lymphoma, cutaneous tuberculosis, polyarteritis nodosa, erythema nodosum, deep lupus erythematosus, and alpha-1 antitrypsin deficiency. Based on the history, clinical picture, as well as laboratory and instrumental studies, the patient was diagnosed with lymphomatoid papulosis. During the examination, no concomitant neoplastic diseases were identified in the patient. All elements resolved with the outcome being hyperpigmented spots and atrophy. To date, the relapse-free period of the disease in the patient is 10 months.
Prosecutor’s supervision over the implementation of legislation in the environmental sphere: features, problems and ways to solve them.
Authors: Yakovlev N. M. , Ivanova I. A.
Published: April 2024

The author examines the main goals and objectives of prosecutorial supervision over the implementation of legislation in the environmental sphere. The main factors that harm the current state of the environment are identified. Statistical data on the main indicators of the activities of the prosecutor’s office of the Russian Federation in the field of the environment and natural resource management are provided.
The legal nature of administrative responsibility in the field of corporate procurement
Authors: Mutalieva A. A. , Silin A. S.
Published: April 2024

Administrative responsibility is an important administrative and legal institution for solving the tasks of protecting and protecting a variety of public relations. At the same time, administrative offenses in the field of corporate procurement are characterized by public danger, illegality, punishability, culpability with features that are due to the specifics of protected relations.
Comparative Study of Jam Processing From Pumpkin with Sugarcane and Pumpkin with Date Juice
Authors:   Department of Food Processing Engineering, University of El Imam El Mahdi, Sudan, HA Ahmed , SHE Idriss ,   Department of Food Processing Engineering, University of El Imam El Mahdi, Sudan, MHA Elhesain ,   Department of Food Processing Engineering, University of El Imam El Mahdi, Sudan, AMOA Babiker ,   Department of Food Processing Engineering, University of El Imam El Mahdi, Sudan, MM Widatalla ,   Department of Food Processing Engineering, University of El Imam El Mahdi, Sudan, M Abdallaa ,   Department of Food Processing Engineering, University of El Imam El Mahdi, Sudan
Published: April 2024

Sudan produced more than 300000 ton of date yearly with different types. For the mentioned reasons this study aimed to process two types of jam of pumpkin fruit, use sugarcane to sweetness one of them, and use a Sudanese date syrup (Wad-laggai Varity) to sweetness the other by concentrate (25%, 50%, 75%, and 100%). Chemical analysis and sensory evaluation for all types of jam were done. Jam that sweetens by concentrate (100%) of date syrup was found to contain high level of minerals (1.40%), protein (2.03%), lipids (0.44%), Reducing sugar (48.36%) and total soluble solids (51.75%), these values present in 100% date syrup were very satisfaction. Jam that sweetens by concentrate 50% of date syrup was found to contain high level of ph (5.01). The jam with (fifty: fifty) date syrup and sucrose was found superior in texture, color, flavor, and general acceptability but Jam with concentrate (100%) of date syrup was found superior in taste. Jam with (0%) concentrate of date syrup was found to be less in texture, color, taste, and general acceptability. There is no significant difference between the panelists at 0.05 and 0.01 degrees of freedom for texture, color, flavor, taste, and general acceptability. Found a significant difference between samples at 0.05 degree of freedom and high significant difference at 0.01 degrees of freedom.
The Mature Ovarian Teratoma: Sign of the Poké Ball
Authors:   Pediatric Radiology Service, Rabat Children’s Hospital, Avicenne University Hospital, Morocco, Chait F , Essetti S ,   Pediatric Radiology Service, Rabat Children’s Hospital, Avicenne University Hospital, Morocco, Bahlouli N ,   Pediatric Radiology Service, Rabat Children’s Hospital, Avicenne University Hospital, Morocco, Allali N ,   Pediatric Radiology Service, Rabat Children’s Hospital, Avicenne University Hospital, Morocco, El Haddad Savan ,   Pediatric Radiology Service, Rabat Children’s Hospital, Avicenne University Hospital, Morocco, Chat L ,   Pediatric Radiology Service, Rabat Children’s Hospital, Avicenne University Hospital, Morocco
Published: April 2024

The "Poké Ball sign" is a distinctive radiological feature observed in mature cystic ovarian teratomas. It is characterized by the presence of a spherical structure floating at the interface between fat and fluid, resembling a Poké Ball (Figure 1) [1]. In the Pokémon® series, a Poké Ball is a spherical device utilized for capturing and containing Pokémon [2].
Scar Formation after Unilateral Pectineal Suspension
Authors:   University Women’s Hospital, Paracelsus Medical University, Nuremberg, Germany, DI Bolovis , CVM Brucker ,   University Women’s Hospital, Paracelsus Medical University, Nuremberg, Germany
Published: April 2024

UPS is a minimally invasive endoscopic procedure using a single Ethibond suture to attach the anterior cervix or vaginal vault unilaterally to the pectineal ligament (Figure 1a). The procedure allows anatomical prolapse correction by repositioning the uterus or vaginal vault to its original place within the pelvis [1]. The clinical image demonstrates the effective creation of supportive scar tissue during laparoscopic re-evaluation (Figure 1b). The fibrous scar formation has the capacity to stabilize the permanent result.
Estimating the Presence of Blood with Reference to Anti-Forensic-A Comparative Study
Authors:   Department of Biochemistry and Forensic Sciences, School of Sciences, Gujarat University, India, K Gautam , G Soumya ,   Department of Biochemistry and Forensic Sciences, School of Sciences, Gujarat University, India, R Joshi ,   Department of Biochemistry and Forensic Sciences, School of Sciences, Gujarat University, India, R Rawal ,   Department of Biochemistry and Forensic Sciences, School of Sciences, Gujarat University, India
Published: April 2024

Number of presumptive tests is there for detection of blood in forensic science. But problems arise in choosing the presumptive test that gives the least false positive result. Difficulties arise due to the small quantity of blood found, so to prevent damage of the sample appropriate reagent is required for the detection of blood. Blood, artificial blood, fake blood, and some false positive-giving substances (including commercial products such as Bleach, Enamel paint, Sauce, and Betadine, chemicals such as copper sulphate, ferrous oxide, and potassium permanganate, vegetables/cereals/fruits such as cauliflower, strawberries, red kidney beans, and rust) were used in these studies. Presumptive tests like Kastle-Meyer, Tetra methyl benzidine, leucomalachite green, BLUESTAR® FORENSIC and Fluorescein test were used. To overcome this problems, comparison of these test reagents are done. In comparison to all other test reagents, Lecomalachite green has the highest accuracy, followed by BLUESTAR® FORENSIC, Fluorescein, Kastle-Meyer, and Tetramethylbenzidine test, which has the lowest accuracy.
The Use of Headless Screws in the Setting of an Acute Posterior Calcaneal Avulsion Fracture in the Pediatric Population: A Case Report
Authors:   Department of Orthopaedics, Stony Brook Medicine, USA, B Lynch , S Bowen ,   Department of Orthopaedics, Stony Brook Medicine, USA, D Wallach ,   Department of Orthopaedics, Stony Brook Medicine, USA
Published: April 2024

Background: Sever’s is the most common cause of heel pain in the pediatric population and increases the risk of calcaneal apophyseal avulsion fractures. This is an uncommon fracture that faces problems with tenuous soft tissue coverage and high shear forces at the fracture site. Multiple fixation techniques have been employed in addressing this injury, with no one method standing out as superior. Case Presentation: We present a case of a 13-year-old male with a calcaneal apophyseal avulsion fracture in which cannulated headless compression screws were used for fixation. This was found to provide adequate compression across the fracture with minimal hardware prominence. This also allowed for the injection of radiopaque solution through the cannulated screw to rule out subtalar intraarticular penetration. We believe this represents a novel method of addressing these injuries. Conclusion: Cannulated headless compression screws are a suitable fixation technique for pediatric apophyseal avulsion fractures that provide the added benefit of assessment of intra-articular penetration of the subtalar joint by the injection of radiopaque solution through the cannulated screw.
Environmental metabolomics characterization of modern stromatolites and annotation of ibhayipeptolides
Authors: Neuhaus George , Aron Allegra , Isemonger Eric , Petras Daniel , Waterworth Samantha , Madonsela Luthando , Gentry Emily , Siwe Noundou Xavier , Kalinski Jarmo-Charles , Polyzois Alexandros , Habiyaremye Julius , Redick Margaret , Kwan Jason , Dorrington Rosemary , Dorrestein Pieter , McPhail Kerry
Published: April 2024

Lithified layers of complex microbial mats known as microbialites are ubiquitous in the fossil record, and modern forms are increasingly identified globally. A key challenge to developing an understanding of microbialite formation and environmental role is how to investigate complex and diverse communities in situ. We selected living, layered microbialites (stromatolites) in a peritidal environment near Schoenmakerskop, Eastern Cape, South Africa to conduct a spatial survey mapping the composition and small molecule production of the microbial communities from environmental samples. Substrate core samples were collected from nine sampling stations ranging from the upper point of the freshwater inflow to the lower marine interface where tidal overtopping takes place. Substrate cores provided material for parallel analyses of microbial community diversity by 16S rRNA gene amplicon sequencing and metabolomics using LC–MS2. Species and metabolite diversities were correlated, and prominent specialized metabolites were targeted for preliminary characterization. A new series of cyclic hexadepsipeptides, named ibhayipeptolides, was most abundant in substrate cores of submerged microbialites. These results demonstrate the detection and identification of metabolites from mass-limited environmental samples and contribute knowledge about microbialite chemistry and biology, which facilitates future targeted studies of specialized metabolite function and biosynthesis.
Block Copolymer-Assembled Nanopores Enable Ultra-Sensitive Label-Free DNA Detection
Authors: Jara Fornerod Maximiliano Jesus , Alvarez-Fernandez Alberto , Füredi Máté , Rajendran Anandapadmanabhan A , Prieto-Simon Beatriz , Voelcker Nicolas H. , Guldin Stefan
Published: April 2024

DNA detection plays an important role in pathogen identification and disease diagnosis but is often limited by lenghty processing times, high costs, and the need for complex equipment and skilled personnel, making it less accessible in point-of-care and resource-limited environments. In this study, we introduce an electrode modification strategy for DNA detection that uses block copolymer-directed nanoporous thin films for nanopore blockage (NB)-based electrochemical biosensors. This approach enables rapid, label-free DNA detection and quantification at femtomolar levels. Deploying a bottom-up fabrication process that leverages on the self-assembly of high molecular weight block copolymers with inorganic sol-gel precursors, we create a highly scalable nanoporous thin film architecture with tailored pore size and arrangement. Crucially, we eliminate the need for complex fabrication including stacking brittle porous membranes, a constraint in existing NB-based DNA sensors. The rapid performance of this sensor is demonstrated by detecting specific single-stranded DNA sequences derived from the 16S rRNA gene fragment of the E. coli genome within 20 minutes, achieving a limit of detection of 30 fM and a limit of quantification of 500 fM. The development of this DNA biosensor represents a significant advancement towards a portable, user-friendly, rapid, cost-effective, and highly accurate DNA detection platform, promising to overcome current limitations of conventional detection methods and broadening the applicability of DNA diagnostics across diverse use cases.
Revealing Ion Adsorption and Charging Mechanisms in Layered Metal-Organic Framework Supercapacitors with Solid-State Nuclear Magnetic Resonance
Authors: Balhatchet Chloe , Gittins Jamie , Shin Seung-Jae , Ge Kangkang , Liu Xinyu , Trisukhon Teedhat , Sharma Shivani , Kress Thomas , Taberna Pierre-Louis , Simon Patrice , Walsh Aron , Forse Alexander
Published: April 2024

Conductive layered metal-organic frameworks (MOFs) have demonstrated promising electrochemical performances as supercapacitor electrode materials. The well-defined chemical structures of these crystalline porous electrodes facilitate structure-performance studies, however there is a fundamental lack in the molecular level understanding of charge storage mechanisms in in conductive layered MOFs. To address this current lack of understanding of charge storage, we employ solid-state nuclear magnetic resonance (NMR) spectroscopy to study ion adsorption in nickel 2,3,6,7,10,11-hexaiminotriphenylene, Ni3(HITP)2. In this system, we find that separate resonances can be observed for the MOF’s in-pore and ex-pore ions. The chemical shift of in-pore electrolyte is found to be governed by specific chemical interactions with the MOF functional groups, with this result supported by quantum-mechanics/molecular-mechanics (QM/MM) and density functional theory (DFT) calculations. Quantification of the electrolyte environments by NMR was also found to provide a proxy for electrochemical performance, which could facilitate the rapid screening of synthesised MOF samples. Finally, the charge storage mechanism was explored using a combination of ex-situ NMR and operando electrochemical quartz-crystal microbalance (EQCM) experiments. These measurements revealed that cations are the dominant contributor to charge storage in Ni3(HITP)2, with anions contributing only a minor contribution to the charge storage. Overall, this work establishes the methods for studying MOF-electrolyte interactions via NMR spectroscopy. Understanding how these interactions influence the charging storage mechanism will aid the design of MOF-electrolyte combinations to optimise the performance of supercapacitors, as well as other electrochemical devices including electrocatalysts and sensors.
Ultrafast and coherent dynamics in a solvent switchable “pink box” perylene diimide dimer
Authors: Bressan Giovanni , Penty Samuel , Green Dale , Heisler Ismael , Jones Garth , Barendt Timothy , Meech Stephen
Published: April 2024

Perylene diimide (PDI) dimers and higher aggregates are key components in organic molecular photonics and photovoltaic devices, supporting singlet fission and symmetry breaking charge separation. Detailed understanding of their excited states is thus important. This has proven challenging because interchromophoric coupling is a strong function of dimer architecture. Recently, a macrocyclic PDI dimer was reported in which excitonic coupling could be turned on and off simply by changing the solvent. This presents a useful case where coupling is modified without synthetic changes to tune supramolecular structure. Here we present a detailed study of solvent dependent excited state dynamics in this dimer by means of coherent multidimensional spectroscopy. Spectral analysis resolves the different coupling strengths, which are consistent with solvent dependent changes in dimer conformation. The strongly coupled conformer forms an excimer within 300 fs. The low-frequency Raman active modes recovered from two-dimensional electronic spectra reveal frequencies characteristic of exciton coupling. These are assigned to modes modulating the coupling from the corresponding DFT calculations. Further analysis reveals a time dependent frequency during excimer formation. Analysis of two-dimensional “beatmaps” reveals features in the coupled dimer which are not predicted by the displaced harmonic oscillator model and are assigned to vibronic coupling.
La seguridad y salud en el trabajo en la formación del ingeniero civil: un acercamiento entre la academia y el sector construcción
Authors: Cifuentes Mora Mónica Esmeralda
Published: April 2024

El ingeniero civil desarrolla actividades que incluyen la planeación, diseño, ejecución, mantenimiento y administración de obras y proyectos, ejerciendo una responsabilidad importante en materia de protección de la salud y cuidado de la vida. Este artículo expone los resultados de un ejercicio investigativo que se desarrolló con el propósito de evaluar la  incidencia que tiene la educación en seguridad y salud en el trabajo en la formación de pregrado en ingeniería civil, al ser considerado un componente de las competencias para esta disciplina, que le permite al egresado integrar la seguridad con aspectos técnicos en todas las etapas del proyecto constructivo desde la planeación y ejecución hasta la operación de una obra, favoreciendo una actuación integral en su ejercicio profesional al contribuir a la prevención de accidentes de trabajo y  enfermedades laborales, los cuales generan altos costos para las organizaciones, los trabajadores, sus familias y la sociedad en general.
Integración de actividades de investigación y acción social en la docencia de Ingeniería Eléctrica
Authors: Coto Jimenez Marvin
Published: April 2024

El objetivo del presente artículo es mostrar los resultados de una experiencia docente desarrollada en la Escuela de Ingeniería Eléctrica de la Universidad de Costa Rica, diseñada para integrar la investigación y la acción social con los contenidos teóricos de un curso de Matemática Superior. Esta experiencia ha sido posible gracias a la interrelación de proyectos inscritos en la Escuela de Ingeniería Eléctrica, así como a la colaboración multidisciplinaria con áreas como la Educación Especial y la Orientación. La finalidad de la experiencia ha sido propiciar el aprendizaje significativo del estudiantado con la integración de los ejes sustantivos de la universidad: docencia, investigación y acción social. Dada la percepción favorable de los estudiantes y el docente en la actividad, se sugiere abrir espacios de reflexión y análisis en otras áreas de especialidad para llevar a las aulas los resultados de sus proyectos y el trabajo multidisciplinario. De esta manera, se puede exponer al estudiantado la problemática de investigación y acción social, donde los conocimientos impartidos encuentran su aplicación y razón de ser.
Demostración lógica sobre coherencia de filosofía de la ciencia y métodos cualitativos de investigaciónen gestión
Authors: Osejo-Bucheli Camilo
Published: April 2024

Objetivo.  Dar claridad y coherencia lógica a la estructura metodológica de la investigación cualitativa. Argumentar pruebas lógicas sobre filosofía de la ciencia y diseño metodológico de la investigación en administración. Métodos. Recopilación de la información: la exegesis textual; interpretación: análisis conceptual; construcción lógica: métodos formales de la filosofía, método geométrico y pruebas. Resultados. Una estructura coherente entre ramas de la filosofía, filosofía de la ciencia, métodos cualitativos de investigación, métodos formales de la filosofía y métodos informales. Concluye, propone y contextualiza sobre los métodos de interpretación de la filosofía. Conclusiones: Implicaciones prácticas: permite dar forma a la metodología de la investigación en ciencias sociales, aporta directamente a la investigación que avanza en el estatuto filosófico de la administración. Originalidad/valor: Combina rigurosamente estructura formal y contenido lógico. Presenta posiciones de la filosofía de la ciencia con importantes aplicaciones directas e inmediatas en la estructuración metodológica de cualquier investigación en ciencias sociales. Tipo de Artículo. Artículo de reflexión.
Cosmological Evolution of Bianchi type-VIₒ Kaniadakis Holographic Dark Energy Model
Authors: Rao B. Ganeswara , Mohanty Dipana Jyoti , Aditya Y. , Prasanthi U.Y. Divya
Published: April 2024

The purpose of this paper is to construct anisotropic and spatially homogeneous Bianchi type-VI0 Kaniadakis holographic dark energy (KHDE) model in general relativity. For this purpose, we consider Hubble horizons as the IR cutoff. To obtain a deterministic solution of the field equations of the model we assume a relationship between the metric potentials which leads to an exponential solution and accelerated expansion. In order to investigate the physical behavior of our dark energy model, we obtain some important cosmological parameters like Hubble, deceleration, equation of state and statefinder as well as ωkhde-ω'khde, r-s and r-q planes. We also included the stability analysis for the dark energy model through the squared speed of sound. It is observed that the equation of state parameter shows ΛCDM model at late times. Also, the squared speed of sound gives the stability of KHDE model at initial epoch and model is unstable at late times. Statefinder diagnostic and deceleration parameters exhibit a smooth transition of the universe from decelerating phase to current accelerated expansion of the universe and also correspond to the ΛCDM model at late times. All these cosmological parameters support recent observational data.
Thermal Properties and Mass Spectra of Heavy Mesons in the Presence of a Point-Like Defect
Authors: Inyang Etido P. , Ali Norshamsuri , Endut Rosdisham , Rusli Nursalasawati , Aljunid Syed Alwee , Ali N.R. , Muhammad Asjad Muhammad
Published: April 2024

In this research, the radial Schr¨odinger equation is solved analytically using the Nikiforov-Uvarov method with the Cornell potential. The energy spectrum and the corresponding wave function are obtained in close form. The effect of Topological Defect on the thermal properties and mass spectra of heavy mesons such as charmonium and bottomonium are studied with the obtained energy spectrum. It is found that the presence of the Topological Defect increases the mass spectra and moves the values close to the experimental data. Our results agreed with the experimental data and are seen to be improved when compared with other works.
Effect of Stratification and Joule Heating on MHD Dusty Viscoelastic Fluid Flow Through Inclined Channels in Porous Medium in Presence of Molecular Diffusivity
Authors: Al Khayer Saleem Jabed , Chakraborty Shyamanta
Published: April 2024

An analysis is carried out to study laminar MHD convection flow of a second order dusty viscoelastic fluid in porous medium through an inclined parallel plate channel in the presence of molecular diffusivity. The plates are maintained at two different temperatures that decay with time. The study is done under the consideration that viscosity and density of the fluid are variable to the extent that it causes stratification and joule heating effect in the process of the flow. The purpose of the study is to examine how stratification and joule heating affect the flow in relation to the physical quantities namely, Stratification factor, Hartmann number, Viscoelastic coefficient, Joule heating parameter, Prandtl number, Eckert number, Schmidt number and Porosity of the medium etc. The non-dimensional governing equations are solved analytically by using regular perturbation technique, and the graphs are plotted using MATLAB programming language. The mathematical expressions for fluid and particle velocity, fluid temperature, fluid concentration, skin friction for fluid and particle, flow flux for fluid and particle, Nusselt number, Sherwood number at the plates are evaluated and their nature of variations for different numerical values of physical parameters are shown graphically, discussed and conclusions are drawn.
A Comparative Study on MHD Forced Convective Flow of Different Nanofluids with Water (H2O) as Base Fluid in a Vertical Rectangular Duct
Authors: Das Bishnu Ram , Deka P.N.
Published: April 2024

In this paper, a comparative study on MHD forced convective flow for heat transfer efficiency of different nanofluids with water (H2O) as base fluid has been carried out. Here, in this study flow through vertical rectangular has been considered in presence of strong magnetic field. In this laminar flow we consider duct walls as electrically non-conducting where the transverse magnetic field acting normally on the duct walls. Joule heat and the viscous dissipation effects are included in the energy equation and furthermore the walls of the duct are kept at constant temperature. An explicit finite difference method has been adopted with fine grid in the control volume for solving the governing equations of this MHD nanofluid flow. Computational processes are carried out using MATLAB code. In this present work we have plotted the flow fields velocity, induced magnetic field, and temperature for various values of MHD flow parameters graphically by varing thermal Grashof number (Gr), Hartmann number (Ha), Reynold number (Re), Eckert number (Ec), Prandtl number (Pr), magnetic Reynold number (Rm), and nanoparticle volume fraction (ϕ)  respectively.
Effect of Gadolinium Content on Magnetic and Structural Characteristics of NFGO Nano-Particles
Authors: Bhavani Sara Durga , Kumar K. Vijaya , Raghavender A.T. , Chelvane J. Arout , Rao B. Purna Chandra
Published: April 2024

Sol gel auto-combustion was used to create gadolinium doped nickel ferrite nano-particles, which have chemical composition NiFe2‑xGdxO4 (x = 0.00, 0.010, 0.15, 0.20 & 0.25). The investigation focused on how the composition of Gd+3 affected the magnetic properties and structural parameters. Magnetic properties were investigated using VSM technique, structural properties were determined using XRD and SEM techniques. XRD graphs verified the establishment of the spinel ferrite phase. With an increase in Gd composition, the crystallite size and lattice parameter increased from 21.0288 to 27.04125 nm and 8.3325 to 8.3367Å, respectively. It was also evident how the composition of Gd+3 affected the estimation of bond-angles and lengths in tetrahedral and octahedral structures. SEM micrographs showed that all of the grains had a small amount of agglomeration and that all of the synthesized compositions were homogenous. The range of 140.5–176.2 nm was found to be the average grain size. Using VSM at 300K, magnetic parameters like coercivity, residual magnetization, and saturation magnetization were computed. Until the composition was 0.20, the saturation magnetization and residual magnetization dropped from 30.28 emu/g to 15.35 emu/g and 5.07 emu/g to 3.65 emu/g, respectively. After that, they increased to 34.40 emu/g and 6.52 emu/g, respectively. Until composition 0.20, coercivity was raised from 154 to 261 Oe; after that, it was lowered to 233 Oe.
Influence of Doping Conditions on the Properties of Nickel Atom Clusters
Authors: Ismailov Kanatbay A. , Saparniyazova Zlikha M. , Kudeshova Gulchekhra T. , Seytimbetova Gulbadan A. , Saparov Fayzulla A.
Published: April 2024

It is shown that the dynamics of changes in the state of nickel clusters depends on the temperature of the diffusion maximum and the cooling rate. It was found that with increasing annealing temperature and cooling rate, an increase in density and a decrease in cluster size are observed. In this case, the main attention was paid to the determination of the laws governing the change in the density, size, and structure of clusters from temperature and cooling. The process and dynamics of the interaction of clusters depends on the diffusion coefficient of impurity atoms in the lattice and the level of supersaturation of the solid solution. It has been established that with a change in the annealing temperature from T = 1100℃ to 1250℃, the cluster density increases by almost 1-1.5 orders of magnitude, and their size decreases by a factor of 5–6. It seems to us that to obtain clusters with stable parameters, the optimal cooling rate is 200–300℃.
Synthesis, Characterization and Functionalization of P3HT-CNT Nanocomposite Thin Films with Doped Ag2O
Authors: Abbas Hayder Abdulmeer , Koubaa Wissem Cheikrohou , Abdullah Estabraq Talib
Published: April 2024

This research focuses on the synthesis of carbon nanotube (CNT) and Poly(3-hexylthiophene) (P3HT) (pristine polymer) with Ag doped (CNT/ P3HT@Ag) nanocomposite thin films to be utilised in various practical applications. First, four samples of CNT solution and different ratios of the polymer (P3HT) [0.1, 0.3, 0.5, and 0.7 wt.%] are prepared to form thin layer of P3HT@CNT nanocomposites by dip-coating method of Ag. To investigate the absorption and conductivity properties for use in various practical applications, structure, morphology, optical, and photoluminescence properties of CNT/P3HT @Ag nanocomposite are systematically evaluated in this study. In this regard, the UV/Vis/NIR spectrophotometer in the wavelength range of 350 to 700 nm is used to investigate the absorption, transmission spectrum, extinction coefficient (k) and refractive index of the samples prepared at room temperature. The XRD results indicate a slight increase in the crystallite size of the synthesized (CNT/ P3HT@Ag) nanocomposite compared to CNT/P3HT nanocomposite, which can be attributed to the better dispersion of the P3HT and its favorable wrapping around the carbon nanotube structures. FESEM results show that the Ag nanoparticles are acting as a bridge between the CNT and P3HT, creating a strong bond between the two materials that is strong enough to form thicker tubular structures.  An appreciable increase in absorbance intensity (approximately 552 nm) is obtained by adding silver nanoparticles to the CNT/P3HT matrix at 0.5% of P3HT. Additionally, the prepared CNT/P3HT@Ag thin films show greater transmittance – more than 42%, 45%, 49%, and 48% for P3HT concentrations of 1%, 3%, 5%, and 7%, respectively. The preparation of the samples' extinction coefficient (k) and refractive index data show that the inclusion of silver nanoparticles to the CNT/P3HT nanocomposite matrix has a significant improvement over the previous samples (CNT/P3HT composite).
Properties of Single Crystal Silicon Doped with Vanadium
Authors: Daliev Khojakbar S. , Khusanov Zafarjon M.
Published: April 2024

The paper reports the sharp increase in resistivity and the conductivity change (type) in the single-crystal silicon sample doped with vanadium. The electrical and optical properties of single-crystalline silicon were determined Hall- and four-probe measurements and infrared (IR-) spectroscopy. Relative resistance, charge carrier concentration, mobility, and concentration of optically active oxygen and carbon in the samples were determined layer-by-layer. It is shown that in silicon samples doped with vanadium the concentration of optically active oxygen atoms tends to reduce.
Identification of Heavy Metals Pollution Sources in The Territory Adjacent to NSC “Kharkiv Institute of Physics & Technology” by PMF Method
Authors: Kozhevnikova Maryna F. , Levenets Volodymyr V. , Lonin Oleksii Yu. , Omelnik Oleksandr P. , Shchur Andriy O.
Published: April 2024

In this paper the content of heavy metals at the territory of Pyatihatki settlement, where the National Scientific Center Kharkiv Institute of Physics & Technology (NSC KIPT) is located. The nuclear-physical methods were used to determine the content of chemical elements in the soil samples taken in 30 points at the territory of Pyatihatki settlement in 2011-2021. The elemental analysis was carried out on the analytical nuclear-physical complex "Sokol". The methods, based on registration of characteristic X-ray radiation of atoms and g-radiation of nuclei excited by accelerated protons, were used.  After the measurements completion, the data arrays on the content of 15 chemical elements (N, Na, S, Cl, K, Ca, Ti, Mn, Fe, Cu, Zn, Zr, Br, Sr, Pb) in the soil samples were obtained. The data arrays processing was carried out using the EPA (Environmental Protection Agency) PMF v3.0.2.2.2 software based on the application of the PMF (Positive matrix factorisation) algorithm. ArcView 3.2a was chosen as the basic software product for the analysis of spatial distribution of the major polluting chemical elements. As a result of the performed work, the pollution sources, which have an impact on the territory near the NSC KIPT, have been identified. The source of the soil pollution is the autostrades, among which the road around the city Kharkiv stands out, where an increase in the content of Pb, Sr, Zr, Cr and Cu was detected.  A source of chromium contamination, located presumably to the north-east of Pyatihatki settlement, was identified. The analyses of the obtained data showed that the PMF method allows to identify the factors that affect the soil contamination, and to determine the presumptive sources of pollution with the help of wind rose.
Interaction of Very Thin Double-Layer Fibres with Electromagnetic Radiation. 1. Numerical Simulation
Authors: Kokodii Mykola G. , Protektor Denys O. , Gurina Darya V. , Dybinin Mykola M.
Published: April 2024

Very thin conductive fibers, whose diameter is much smaller than the wavelength, strongly absorb and scatter electromagnetic radiation. The efficiency factors of absorption, scattering and radiation pressure of metal fibers with a diameter of several micrometers in the centimeter wavelength range reach several thousand. The absorption of electromagnetic radiation in two-layer fibers has been studied. In fibers with a metal core and a lossless dielectric cladding, the absorption is the same as in solid metal fibers. In lossy cladding fibers, strong absorption occurs when the fiber diameter is several nanometers. Fibers with a dielectric core and a metal cladding strongly absorb radiation when the thickness of the cladding is comparable to the thickness of the skin layer.
End-to-end service survivability under attacks on networks
Authors: Molisz Wojciech , Rak Jacek
Published: April 2024

Network survivability is a capability of a networked system to provide its services despite failures or attacks. Attacks, e.g., due to acts of war, being potentially damaging events, were basically considered in the historical definitions of a survivability phenomenon. The meaning of the term: ”network survivability” evolved in the last decade. Recently, attacks replayed the important role again. Their nature, however, including intrusions, probes, denials of service, differs from the old one. Survivability is strongly related to other fields of study. In particular, quality of service depends on network survivability. We investigate these dependencies in scale-free networks. Many networks are scale-free, i.e., their node degree distribution follows the power law. Nodes of the highest degrees, called centers, are highly vulnerable to attacks. Elimination of these nodes seriously degrades the overall performance of network services. In this paper we propose a model, which, based on traffic parameters of a demand, like delay or bit rate, allows to establish the survivable and attack proof end-to-end connections. The key idea of this model is that for the significant traffic, it establishes paths, which omit centers. The important connections become more resistant to attacks. We show that in the best case, obtained for the highest class of service, the number of broken connections is reduced even by factor 3. Example results are compared to those for the standard distance metrics. Our model is applicable to many network architectures and many classes of service.