bluuebunny/crossref_metadata_2025 huggingface dataset:
Gestión de Alimentos y Bebidas
Authors: Oña Izurieta Milton Paul
Published: October 2024

El departamento de Alimentos y Bebidas es crucial en la operación de un hotel, contribuyendo significativamente a sus ingresos, que pueden superar el 50% del total en grandes establecimientos. Esta gestión combina pasión culinaria con rigor empresarial, desde la concepción del menú hasta la satisfacción del cliente, y requiere habilidades administrativas, creatividad y comprensión del mercado. Principios administrativos son esenciales para equilibrar recursos financieros, comerciales y humanos, con una planificación estratégica y garantía de calidad que impactan directamente en la experiencia del cliente y los resultados financieros. La gestión se enfoca en operaciones, recursos humanos, finanzas, marketing, calidad y servicio al cliente, utilizando la gestión por procesos para satisfacer las necesidades del cliente. El marketing es fundamental para anticipar y adaptarse a las tendencias en gustos alimentarios, salud, higiene y entretenimiento, creando experiencias gastronómicas memorables que atraen y fidelizan a los clientes. La selección de personal es crucial, buscando perfiles que combinen conocimientos teóricos con habilidades prácticas para asegurar la calidad del servicio. Los establecimientos gastronómicos varían en servicios: restaurantes, cafeterías, fuentes de soda, drive-ins y bares, cada uno con características específicas. En Ecuador, el Ministerio de Turismo regula estos establecimientos, asegurando el cumplimiento de normativas y la implementación de sistemas de control y seguridad alimentaria para garantizar la calidad y frescura de los alimentos. La conservación y seguridad alimentaria son esenciales, destacando la importancia de las Buenas Prácticas de Manufactura (BPM) y normativas como HACCP e ISO 22000 para asegurar la producción de alimentos seguros y proteger la salud pública. La formación continua del personal es clave para implementar estas normativas, garantizando la seguridad y calidad en la producción de alimentos. La satisfacción del cliente es fundamental para diferenciar a los establecimientos en un mercado competitivo, con la tecnología facilitando la anticipación y satisfacción de las necesidades del cliente, generando lealtad hacia la marca. La investigación continua en la experiencia gastronómica ofrece oportunidades de mejora en este campo.
Eventos y Banquetes
Authors: Enríquez Ruíz Yomaira Paola
Published: October 2024

En la presente guía se presenta una visión detallada acerca de la organización de eventos, en la primera unidad se destaca el concepto de "evento" como un acontecimiento que requiere planificación, ejecución y evaluación, subrayando su relevancia en la industria turística tanto como producto demandado como herramienta de gestión de destinos. Los eventos se clasifican por su naturaleza (académicos, sociales, culturales, comerciales), localización (locales, regionales, nacionales, internacionales) y el ente organizador (personas naturales o jurídicas), cada uno con características únicas. La organización de un evento comprende tres etapas: planificación, ejecución y evaluación. La planificación incluye definir el tema, establecer la fecha, organizar y seleccionar el lugar, y elaborar un cronograma detallado. La ejecución se centra en cumplir con las actividades planificadas, gestionar imprevistos y supervisar el desarrollo. La evaluación analiza el desempeño del evento, proporcionando retroalimentación y áreas de mejora. Finalmente se presenta el protocolo y el ceremonial mismos que son esenciales para la organización de eventos, asegurando orden y respeto por las costumbres. La precedencia establece el orden jerárquico de los participantes, promoviendo la equidad en la participación. Personal capacitado en protocolo es crucial para garantizar que cada detalle del evento sea cuidadosamente planificado y ejecutado, asegurando su éxito y el cumplimiento de los objetivos.
Guilty or Not Guilty
Authors: Brewer Cameron D. ,   Philosophy Documentation Center
Published: October 2024

Here I describe an exercise that engages students and helps to introduce difficult concepts. The exercise can be used in a variety of courses, it can be tailored to help introduce future course concepts or readings, and it can be used in any level course; it engages both students with strong backgrounds in philosophy and students new to the discipline. The exercise can be used in courses covering ethics, social justice, philosophy of law, criminology, or epistemology. This paper explains the exercise and highlights some ways the exercise can be modified.
PENERAPAN SISTEM E-KATALOG SEBAGAI POLA KEMITRAAN UNTUK MENINGKATKAN PRODUKTIVITAS UMKM
Authors: Dwi Sofian Octa
Published: October 2024

This research aims to determine the application of the e-catalog system implemented by the Batu City Goods and Services Procurement Section, especially in the process of procuring goods and services within the Batu City Government. Apart from that, to analyze more deeply about a partnership process, especially for UMKM in Batu City, related to the existence of an e-catalog. By implementing the e-catalog, it provides space for movement in partnerships between government agencies and UMKM in Batu City. The problem focuses on the partnership process which includes: use of digital technology, transparency of UMKM, dependence on government and administrative requirements. This research refers to the implementation of an e-catalog system related to the partnership process with UMKM. The research method used is descriptive qualitative by analyzing human resource development strategies. Data was collected through interviews with staff in the Batu City Goods and Services Procurement Section as well as the head of Batu Orange Cake UMKM. This study concludes that the partnership has been implemented and needs to be improved at certain points during the partnership process.
Key Risk-Factors Contributing to Cardiovascular Disease: Lifestyle Modifications to Improve Cardiovascular Health
Authors:   School of Health and Life sciences, University of the West of Scotland, UK, Ph.D Ejiofor Augustine Ezika , MBSS Adaobi Nwankwo-Ezika ,   Family medicine, Isle of Wight NHS Trust, UK, Ph.D Chibuzor Roselyn Ezendiokwelle ,   Department of Social Work, University of East London, UK, PhD John Obeng ,   School of Health and Society, University of Salford, UK, PhD Bolanle Ola ,   Institute of Digital Health Care, University of Warwick, UK
Published: October 2024

Cardiovascular disease is a preventable public health issue. The aim of this review is to identify modifiable risk-factors for cardiovascular disease and recommend lifestyle modification to prevent cardiovascular disease. PubMed, ScienceDirect, SAGE, Google Scholar, World Health Organisation websites, as well as public and community health textbooks, were hand searched and academic resources which are relevant for this review were selected for inclusion. Cardiovascular disease is leading cause of deaths in all continents of the world. While deaths from cardiovascular disease is increasing in Africa and Asia, it is decreasing in Australia and fluctuating in the USA. Premature deaths from cardiovascular disease are preeminent across middle income countries in Europe compared with high income countries. Cardiovascular disease is higher in rural areas of South America compared with urban areas. Trends in lifestyle patterns, including physical inactivity, smoking behaviour, and diets contribute to cardiovascular disease-prone conditions. Prevention includes health promotion activities that facilitate healthy living across life course and limit the initial onset of cardiovascular disease. Investment in prevention is the critical sustainable solution for the cardiovascular disease epidemic. Adopting WHO existing policies within individual countries in Africa, Asia, and middle-income countries in Europe, and ensuring robust implementation of such policies across life course and from different layers of sectors such as education and workplaces would have wider impacts in reducing risk and cardiovascular disease burden in the respective continents. Government of countries with worsening cardiovascular events should also increase health financing and focus on strengthening primary health care services for prevention and treatment of cardiovascular disease.
Flexibility and Adaptation of Contract Law
Authors: Syafa'i Imam , Megasari Indah Dewi
Published: October 2024

This study aims to explore the differences in the flexibility and adaptation of contract law in Indonesia which adheres to the civil law system and Singapore which is based on common law, as well as its implications for modern business. Contract law in Indonesia is still heavily dependent on the Civil Code (KUHPerdata), which dates back to the colonial era and has not undergone significant updates. This has led to stiffness in the implementation of contracts, especially in fast-growing business sectors such as digital technology. In contrast, Singapore has adopted a common law system, which is more flexible and able to adapt to changes in the economy and international business dynamics through the use of precedents. In a business context, flexibility and legal adaptation are essential because contracts often have to adapt to new emerging needs, including changes in technology, regulations, and market conditions. This study uses a normative juridical approach with a comparative method, examining laws, court decisions, and related academic literature. The case study of business contracts between Indonesian and Singaporean companies in the technology sector is also used as a study material to provide a practical view of the effectiveness of each country's legal system in facing contemporary business challenges. The results show that Singapore excels in contract flexibility due to the use of precedents that allow for legal adjustments without the need for formal legislative changes. On the other hand, contract law in Indonesia is often unable to keep up with rapid developments due to rigid and outdated regulatory limitations. This difference has an impact on the speed and efficiency of contract dispute resolution in both countries, with Singapore being able to resolve disputes more quickly through a more responsive system. This study concludes that to increase competitiveness in the global economy, Indonesia needs to reform the Civil Code to be more flexible and adaptive like the one implemented in Singapore. These recommendations are important to ensure that Indonesia can create a more competitive business environment and support innovation, especially in the ever-evolving digital era.
A mídia norte-americana e o caso da espionagem do balão chinês
Authors: Guedes de Oliveira Marcos Aurélio , Santos da Cruz Vinicius
Published: October 2024

Como os veículos de mídia conservadores e liberais dos EUA enquadraram tematicamente o caso do balão chinês? Este artigo investiga a influência das diferenças político-ideológicas entre jornais conservadores (NYP e WT) e liberais (NYT e WP) nos temas enfatizados sobre o incidente do balão chinês. Utilizando uma metodologia que abrangeu a análise de 144 artigos de notícias com uma abordagem sistemática e padronizada de análise de conteúdo, os resultados mostram que, nos conservadores, prevaleceu a categoria "Críticas ao governo", com foco na gestão de Biden, enquanto nos liberais, a ênfase foi em "Política externa e diplomacia", destacando as relações EUA-China. Ambos os grupos destacaram a ameaça de espionagem na passagem dos balões sobre áreas consideradas de segurança nacional.
Relações de gênero na formação profissional: desafios no campo da enfermagem
Authors: Rocha Samara Raquel de Sousa , Silva Jeferson Barbosa , Lima Gigliola Marcos Bernardo de , Alexandrino Arthur , Agra Glenda , Saraiva Alynne Mendonça
Published: October 2024

Objetivo: compreender a concepção dos estudantes de enfermagem sobre a relação entre gênero e formação profissional Método: pesquisa qualitativa do tipo descritiva exploratória, realizada em uma instituição pública de ensino superior, do interior do estado da Paraíba, com 16 estudantes. Os dados foram obtidos por meio de um roteiro semiestruturado e analisados pela Análise de Conteúdo de Bardin. Resultados: a divisão sexual do trabalho, as desigualdades de gênero e as situações de violência, como o fenômeno Bropriating e a hipersexualização do corpo feminino, foram evidenciadas, além dos desafios institucionais e da fragilidade dos docentes na desconstrução das relações de gênero, durante a graduação. Conclusão: o estudo evidencia uma situação de desigualdade entre os gêneros, enfatizada pelos graduandos de enfermagem, sinalizando para a necessidade de rearranjo institucional, bem como a sensibilização dos docentes e da comunidade acadêmica para a oferta de uma educação inclusiva, igualitária, pautada na diversidade.
Qualidade do sono e fatores de risco cardiovascular em acadêmicos de enfermagem: estudo transversal
Authors: Santos Amanda Tisatto dos , Paz Gabriela de Borba , Santos Vilma Constância Fioravante dos , Pinto Joséli do Nascimento , Capellari Claudia
Published: October 2024

Objetivo: identificar a relação entre sono e risco cardiovascular (RCV) em acadêmicos de enfermagem. Método: estudo quantitativo e transversal. A população foi constituída por acadêmicos de graduação em Enfermagem da região metropolitana do estado do Rio Grande do Sul. As variáveis incluíram dados sociodemográficos, antropométricos, de condições de saúde, questionário de qualidade de sono de Pittsburgh e teste de Fagerstrom para a dependência à nicotina. Resultados: participaram 122 estudantes, sendo 78 ingressantes e 44 concluintes. Os concluintes apresentaram maiores níveis de pressão arterial, de índice de massa corporal e de relação cintura-quadril, quando comparados com os ingressantes, bem como informaram realizar menos atividade física, consumir mais bebida alcoólica e dormir menos horas; também possuem maiores alterações no sono e maior sonolência diurna. Conclusão: estudantes concluintes apresentam maiores fatores de RCV em relação aos ingressantes. Não houve resultados significativos entre a classificação geral do sono e os fatores de risco cardiovascular.
As dimensões da (des)valorização da enfermagem: percepções dos trabalhadores no contexto da pandemia da covid-19
Authors: Cassiano Carolina , Oliveira Priscila Andreja , Leal Laura Andrian , Galon Tanyse , Henriques Silvia Helena , Santos Álvaro da Silva
Published: October 2024

Objetivo: compreender as percepções dos trabalhadores de enfermagem, atuantes em Unidade de Terapia Intensiva, acerca da valorização do seu trabalho no contexto da pandemia da covid-19. Método: pesquisa descritiva e qualitativa, conduzida com enfermeiros e técnicos de enfermagem atuantes em Unidade de Terapia Intensiva para pacientes com covid-19 de um hospital público em Minas Gerais. As entrevistas semiestruturadas foram realizadas entre janeiro e fevereiro de 2022, audiogravadas e analisadas indutivamente. Resultados: participaram 15 enfermeiros e 13 técnicos de enfermagem, os quais destacaram valorização temporária durante a pandemia, descrença na valorização contínua, sentimento de desprestígio, distinção entre classes profissionais, desrespeito dos pacientes, múltiplos empregos e esperança no piso salarial e na redução da carga horária. Conclusão: torna-se essencial garantir condições dignas de trabalho, suporte emocional, remuneração e carga horária justas, reconhecendo o esforço e o conhecimento desses profissionais, indispensáveis na saúde em qualquer nível de complexidade.
Privacy-Preserving Authentication in VANETs
Authors:   , Akil Mahdi
Published: October 2024

Vehicular Ad Hoc Networks (VANETs) are transforming urban transportation by addressing challenges like traffic congestion, road safety, and vehicular pollution. They enable real-time communication between vehicles and infrastructure, improving traffic flow, reducing accidents, and lowering emissions through optimized route planning and reduced idle times. With advanced sensors and data analytics, VANETs adapt dynamically to traffic conditions and facilitate efficient navigation for emergency vehicles, enhancing urban mobility amid growing transportation demands. The continuous broadcasting of vehicle information raises privacy concerns, as this data can be exploited to track and identify drivers. These concerns become even more complex in the context of privacy-preserving vehicle rentals, where existing protocols do not adequately protect the security needs of owners and renters, especially when vehicles are shared. Addressing these privacy and security issues is crucial for the widespread adoption of VANETs. This thesis presents a comprehensive framework that enhances privacy and security in VANETs through novel authentication schemes. The proposed protocols ensure secure, privacy-preserving communications and allow vehicles to be shared among multiple drivers without compromising network security. Additionally, the thesis analyzes the underlying security requirements and proposes robust, scalable solutions compatible with future transportation advancements. These contributions lay the foundation for broader VANET adoption, supporting the transition to smarter, more efficient, and more secure urban transportation systems.
Determinants of the Credibility of the Police Force from the Perspective of Citizens’ Complaints about the Police Service
Authors: Dinušová Dominika , Sabayová Mária
Published: October 2024

The study deals with research on the credibility of the Police Force based on content analysis of complaints from citizens of the Slovak Republic. It aims to define, on the basis of this analysis, the areas that citizens perceive as sensitive in the work of the police in relation to their trust in the police organisation. The analysis is based on the data contained in the Report on the handling of complaints and petitions within the competence of the Ministry of the Interior of the Slovak Republic for the year 2021 and on our research of complaints registered in the first half of 2021 at the Presidium of the Police Force in Bratislava. On the basis of the study of complaint files at the Complaints Department of the Control Division of the Presidium of the Police Force as a representative research sample, it is possible to identify the friction areas of police work and its perception by the public in both qualitative and quantitative terms. At the same time, the above-mentioned period allows for an assessment of the extent of the influence of a particular security situation (the COVID-19 pandemic) on the relationship between the public and the police. The potential for strengthening the credibility of the Police Force is outlined, particularly in the area of police ethics.
Změny půdní vlhkosti v různých variantách borového porostu na chudých písčitých půdách během vegetační doby
Authors: Špulák Ondřej
Published: October 2024

Soil water is one of the fundamental conditions for the development of the forest ecosystems. Habitat conditions and forest tree composition are the basic factors influencing development of soil moisture. Tree growth and forest structure changes progress fluctuations in the hydric regime. The article evaluates development of soil moisture in different growth conditions of Scots pine stands on nutrient-poor sandy soils and defines the basic principles of these relationships. In 2018, the moisture of A horizon was measured in transects across the stands and clear-cut areas. In the period from 2018 to 2020, the vertical moisture profile was evaluated by means of dug probes under a mature stand of pine, on clearcut area without soil preparation and in the space of the mounds and furrows on clear-cut area with soil prepared for natural regeneration by ploughing. The results showed that also in these conditions the moisture in the clear-cut area was all year round higher in comparison to the mature pine stand, however, topsoil moisture under the young pine growth with closed canopy was no longer different from the moisture of mature stand. Even in dry periods, the humidity on the clear-cut area decreased with the depth in the soil. Under the mature stand, this only happened when there was a sufficient amount of water in the ecosystem. The influence of the period within the growing season was not clearly reflected in the monitored long-term course of moisture in the soil horizons.
Inventarizácia invázneho druhu pajaseňa žliazkatého (Ailanthus altissima) v urbánnom prostredí – prípadová štúdia
Authors: Pauková Žaneta , Hauptvogl Martin
Published: October 2024

Tree of heaven [Ailanthus altissima (Mill.) Swingle] (family Simaroubaceae) is known as an invasive woody species in urban, rural, and natural ecosystems in many parts of the world. In Slovakia, it is accepted as an invasive species included in the list of invasive alien species of the EU concern (Regulation No. 2019/1262). In this study, the spread of the invasive neophyte A. altissima populations was monitored in the immediate vicinity (1 km) of the Slovak University of Agriculture in Nitra in southwestern Slovakia in 2022. We recorded habitat type, GPS coordinates in the centre of the local populations, area of population (m2), average tree height (m), and management measures. The species colonized an area of 1,997 m2. The plant spread mainly in the habitat of extensively cultivated fields such as front gardens of buildings (31%) and in abandoned and unused areas (the species occupied 28% of the total area). We recorded a lower occurrence in the botanical garden (18%), next to the anti-flood dam (16%), along roads (4%) and in the orchard (3%). Approximately 15% (28 shoots) of the total number of 183 shoots were female plants that formed a high number of seeds. There was a high correlation between the area occupied by A. altissima with its above-ground organs and the average plant height (m) (r = 0.88).
Ptačí diverzita v historickém zámeckém parku – implikace pro ochranu biodiverzity v hospodářských lesích
Authors: Machar Ivo
Published: October 2024

Long-term trends of abundance and diversity of forest birds have been very stable over past decades in European managed forests. It can be caused by high heterogeneity on habitat scale. In European cultural landscapes, there is another habitat very similar to managed forests, and that is a historic manor park. The parks can even show higher bird diversity than managed forests. However, there is an evident knowledge gap related to long-term changes of bird abundance and diversity in the habitats of manor parks. In this study we observed long-term changes of bird community in the historic manor park Čechy pod Kosířem (Czech Republic) using comparison of bird territory mapping in 2022–2023 with older bird studies in this locality. We gained an overview of bird community changes in the manor park for the period of 1997–2023. Results show that the bird community in historic manor park was remarkably unvarying in abundance and diversity. Historic manor parks can be considered as important refuges for forest bird diversity in cultural landscapes. We discuss the research implications for conserving bird diversity in managed forests especially in connection with large old trees preservation providing heterogeneity of nest habitats.
Indiferentní reakce sazenic borovice lesní a buku lesního ošetřených hydroabsorbenty
Authors: Bartoš Jan , Leugner Jan , Kacálek Dušan , Špulák Ondřej , Hacurová Jana
Published: October 2024

Super-absorbents are expected to amend soils as they are capable of retaining water, which turns dry loose powdery substances (also capsule) into hydrogel. These were applied to prevent an artificial regeneration failure due to drought events. Four commercially-available products were mixed with soil from planting holes (the capsule was put to the soil) in order to support bare-root Scots pine and European beech seedlings after a spring planting on eleven clear-cut sites in 2020–2021. The plantations were designed as rows with 4 × 150 plants treated with four hydrogels plus 150 plants without hydrogel as a control. The performance evaluation of new plantations was based on attributes such as mortality/survival and relative height and root-collar diameter increments. The plants, which lost their initial size, due to pine weevil damage, dry tops and damage by game, were excluded from the evaluation. Besides the plant response to the applied super-absorbents, the planting operations were evaluated from economic point of view. The 2020 plantations showed higher mortality than 2021 ones; both years showed an excessive loss. The hydrogels did not help the plants to survive better compared to control and growth data also showed ambiguous results. Therefore, from commercial perspective, the application of all tested super-absorbents just increased the renewal costs.
Prevention of HIV among Older Adults: A Comprehensive Review
Authors:   School of Natural and Applied Sciences Kampala International University Uganda, Ngugi Mwaura J.
Published: October 2024

HIV/AIDS has historically been associated with younger populations, but the growing number of older adults affected by the virus has prompted a shift in focus. This review examines the unique challenges faced by older adults in preventing and managing HIV, addressing their biological, social, and healthcare-related vulnerabilities. Factors such as the success of antiretroviral therapy (ART) in extending life expectancy, late diagnoses, and the lack of targeted prevention efforts contribute to the increasing prevalence of HIV among individuals over 50. The review explores the epidemiology of HIV in older adults, the risk factors specific to this demographic—including sexual health, low awareness, and social isolation—and the barriers to adequate healthcare access, such as stigma and inadequate provider awareness. Additionally, the review dispels common misconceptions about HIV in older adults, including stereotypes around sexual inactivity and age-related immunity. The need for age-specific prevention strategies, tailored healthcare interventions, and improved education on sexual health in older adults is highlighted. By identifying gaps in current HIV prevention programs and proposing comprehensive interventions, this review emphasizes the importance of addressing the HIV epidemic among older adults to ensure equitable healthcare outcomes. Keywords: HIV/AIDS, older adults, antiretroviral therapy (ART), late diagnosis, sexual health, HIV prevention.
Aerodynamic optimization of winglets for an Unmanned Aerial Vehicle
Authors: Ivković Dušan , Kostić Ivan , Kostić Olivera , Dinulović Mirko , Simonović Aleksandar
Published: October 2024

The main aim of this paper was to determine the influence of different parameters of winglet design on overall Unmanned Aerial Vehicle (UAV) aerodynamics. Looking from an aerodynamicist's point of view, the main reason for using such wingtip devices is to reduce induced drag component, which noticeably contributes to total drag when flying both in cruising flight and on higher angles of attack at lower speeds. Significant benefits of using winglets on overall aircraft performance include reduced fuel burn, increased maximum range and endurance, and higher cruise altitude. Total drag of a simplified mock-up of an existing tactical UAV was calculated using hybrid approach. Parasite drag was obtained using analytical and semi empirical methods, while the induced drag and the lift in its linear domain were determined using inviscid CFD model based on a 3D vortex lattice method (VLM). Computational analyses were focused on determining the influence of winglet cant angle, root chord length, span, airfoil, and twist angle on lift-to-drag ratio of the UAV. Results obtained for different types of winglets (straight, blended and elliptical) were compared, and the best performing in the prescribed dimensions were the elliptical winglets. Their geometry was further optimized, finally providing an overall lift-to-drag ratio increase of 7% compared to the original UAV design without winglets, which represents quite remarkable improvement.
Evaluation of the influence of power setting on aircraft performance in a spin
Authors: Šobot Jelena , Jankuloski Đorđe , Živković Miša , Jelisavac Jasminka , Vesić Ivan
Published: October 2024

Aircraft spin is a critical flight regime that is strictly prohibited for the majority of airplanes. However, due to its critical nature, it is mandatory in military aerospace to carefully test and analyze different spin scenarios and observe all spin characteristics. This paper presents an analysis of the influence of varying power and thrust on aircraft performance during spin and spin recovery. The behavior of the aircraft was observed and analyzed during flight tests of a light airplane in a clear configuration with two different c.g. positions. Due to the gyroscopic effects of the propeller, the influence of power differs between left and right spins, necessitating tests for both spin directions in each configuration. The results reveal significant differences in spin dynamics based on power settings, highlighting the role of propeller-induced forces. Spins entered with full throttle exhibited more pronounced entry characteristics and pre-spin roll compared to spins entered at idle. Left spins were found to be less oscillatory and had a lower pitch angle, while right spins were more oscillatory and steeper. The data obtained provides valuable insights into spin dynamics, contributing to improved pilot training, flight safety protocols and aircraft design considerations related to spin performance. The findings from these tests are crucial for enhancing spin awareness and serve as a guide for both engineers and pilots.
Small fixed-wing UAV precision aerial drop capability development
Authors: Antonić Vuk , Trifković Milenko , Molović Vojimir
Published: October 2024

Small fixed-wing unmanned aerial vehicles (UAVs) have proven themselves as invaluable assets for reconnaissance and surveillance missions. Their improvement and further development most often focuses on improved endurance, datalink range, camera capabilities etc. This paper presents a modular approach to "Vrabac" UAV improvement by integrating wing payload extensions, enabling precision aerial drop capabilities. This enables precise delivery of lethal or non-lethal payloads from the UAV at predetermined coordinates or at a visually aquired target. Precision aerial drop software module is presented, focusing on the automated payload drop algorithm with continually calculated impact point prediction (CCIP) and UAV guidance to the continually calculated release point (CCRP). The chosen ballistics computation and control system implementation evaluates UAV flight parameters, wind direction and velocity, terrain profile etc. to achive a precise target strike. Simulated results with a parameter sensitivity analysis, as well as field test results are presented.
Analysis of the mass and aerodinamical changes due to implementation of an external rescue system on a medium range UAV
Authors: Ostić Branislava , Milenković-Babić Miodrag , Stefanović-Gobeljić Vanja , Ostojić Branislav
Published: October 2024

Upgrading process of any aircraft or UAV system leads to a new design verification in almost every aeronautical field and at the end to an accepted compromise between all design points with the aim of reaching a light, reliable, durable and economical aircraft. A change in the center of aircraft mass position is in a direct correlation with aircraft performance and stability. Any additional change on the existing aircraft or UAV (implementation of a new system or a component) requests analysis of the aircraft mass, position of the center of mass and aircraft performances. This paper presents an analysis of the change in the center of mass position of the medium range UAV due to the integration of the aircraft rescue system at the wing hardpoint, and comparison of the aircraft performances before and after that integration.
Analysis of the behaviour of the mobile platform during firing
Authors: Simonović Milan , Simonović Marko , Živković Aleksandra , Gačić Ana , Kari Aleksandar
Published: October 2024

This paper describes the problem of the behavior of the truck 6x6 during the firing process from an antiaircraft gun 40 mm, which is integrated on this vehicle. The calculation of the center of gravity coordinates and the reactions of the supports of the vehicle with an integrated gun is shown. Internal ballistic calculation determines the maximum recoil force. The behavior of the mobile platform is presented using a mathematical-mechanical model of platform oscillation, which was formed on the basis of the classical principles of the theory of vehicle dynamics. With the adopted simplifications, the system with a large number of degrees of freedom is reduced to a system with three degrees of freedom, whose generalized coordinates are: vertical position of the system T, rotation around the transverse axis (galloping) and rotation around the longitudinal axis (rolling). MATLAB software package was used for calculation. Generalized coordinates changes over time, as well as the velocity of these coordinates, were determined. The analysis determined that the position of the anti-aircraft gun on the vehicle is favorable, because the system easily supports all the loads caused by the firing and the weight of the weapons, and it also allows obtaining small oscillation values, which are easily dampened by the elastic suspension system.
Simulation model of prioritized threat selection in defensive multitarget military swarming
Authors: Janković Radomir
Published: October 2024

A dynamic prioritized selection of threats and targets, as well as assignment of available resources, are important issues in discrete events simulation of defensive multitarget military swarming. An approach to simulation modelling of swarm counter swarm conflicts in a territory cell, where multiple mobile ground threats organized in swarms are attacking multiple objects defended by swarms of armed mobile platforms is presented in the paper.
Prediction of artillery correction elements by software for Ballistics Module of Fire Control Systems
Authors: Petrović Dragoslav
Published: October 2024

At present, by software for Ballistics Module -BM of Fire Control Systems -FCS can be calculated GUN elements - elevation in vertical plane and angle of its direction in horizontal plane. There is serious reason, say forced, for recording part of actual trajectory, not observing impact point of projectile fall, and on its values predict point of projectile fall, say only one. This method enables firing two projectiles for acceptable time period, firing second projectile with corrected GUN elements before first projectile is reached impact point - target. Finally, method for prediction artillery correction elements is based on comparing part of numerical data of actual path trajectory and corresponding data of nominal trajectory.
Change of speed of comfort parameters in the armored combat vehicles of the Serbian Army due to environmental conditions
Authors: Mališić Snežana , Ivanović Milica , Stanić Filip
Published: October 2024

This scientific paper refers to the conditions of the working environment of the crew members of the combat armored vehicle from the aspect of climate comfort and from the aspect of speed of the response of sensors (transducers).
Blast performance of isopropyl nitrate-based thermobaric explosives vs. cast-cured PBX
Authors: Bajić Danica , Terzić Slavica , Timotijević Mladen , Sirovatka Radoslav , Knežević Dragan , Blagojević Igor , Radmanovac Maja
Published: October 2024

Thermobaric explosives are currently among most studied energetic formulations, due to their extraordinary combination of blast and thermal effects. They may be in the form if liqud explosive mixtures, often denoted as fuel-air explosives (FAE) or solid explosive charges, as solid fuel-air explosives (SFAE) or thermobaric explosives (TBE, TBX). This study compares the blast effect of selected formulations of the two types of thermobarics in field test. As FAE, compositions were prepared based on gelled isopropyl nitrate with metal particles as fuel component, and as TBE a multi-component polymer bonded explosive (PBX) was prepared, based on octogene, aluminium powder, ammonium perchlorate and a polymer binder. The selected explosive formulations were prepared as cylindrical charges of 5 kg and activated with electric detonator at 2 m height in open field test. The characteristics of the blast wave in air (maximum overpressure, duration of the positive phase of the pressure and impulse) were measured at different distances from the activation spot, using piezoelectric gauges. Also, the thermal effect of the explosions was observed with infra red imaging technique.
Multisensor image fusion: Dataset, methods and performance evaluation
Authors: Laidouni Mohammed , Bondžulić Boban , Bujaković Dimitrije , Adli Touati , Andrić Milenko
Published: October 2024

Multisensor image fusion is a crucial research area aiming to enhance image clarity and comprehensibility by integrating information from multiple sensors. This paper presents a residual dense transformer (RDT) architecture for multisensor image fusion to address the challenges posed by the unique strengths and limitations of visual infrared (VIS), near-infrared (NIR), and long-wavelength infrared (LWIR) sensors. A comparative analysis is conducted with several state-of-the-art fusion methods using various objective evaluation indicators to asses the image fusion quality. We used a 313 triplet images collected from three datasets: TRICLOBS, MOFA, and MUDCAD, covering diverse environmental conditions such as foggy conditions and low illumination. Through the evaluation of the RDT and state-of-the-art fusion algorithms on this dataset, we observe that RDT achieve the best overall performance across multiple spectra image fusion. This work, thus, serves as a platform for developing and comparing new algorithms to deal with images from three sensors. which AIDS in the development of various applications such as object tracking, detection, and surveillance.
Optimal source localization in a real radio channel based on TDOA approach using the hybrid Differential Evolution algorithm
Authors: Rosić Maja , Sedak Miloš
Published: October 2024

Accurate localization of sources in real radio channels is crucial for various applications ranging from military and civilian domains, notably in security, radar, and sonar systems. This paper presents a novel approach for source localization utilizing the Time Difference of Arrival (TDOA) method in a real radio channel environment. The localization problem is formulated as an optimization task, where the objective is to determine the optimal source location based on TDOA measurements obtained from multiple receivers with known positions, with the objective function derived using the least squares (LS) method. To address the complexity of the optimization problem, a hybrid approach that combines the Differential Evolution (DE) algorithm with conventional Nelder-Mead optimization algorithm has been proposed. The performance of the proposed hybrid algorithm is extensively evaluated and compared with traditional methods using numerical simulations. Results demonstrate the efficacy of the proposed approach in achieving superior localization accuracy in real radio channels, highlighting its potential for practical deployment in diverse applications.
GRE tunnel utilization for minimizing multi-vendor network equipment issues for various transmission channels
Authors: Marković Marko , Kašca Lara , Nešković Đorđe , Stanković Stefan , Perić Miroslav , Koprivica Mladen , Marković Goran
Published: October 2024

In the realm of battlefield operations, where seamless communication is paramount, the utilization of all available networking equipment is indispensable. However, the diverse array of vendor equipment often poses compatibility challenges across different transmission channels. These issues are frequently rooted in the varying limitations of packet length among the equipment, leading to undesirable packet fragmentation and potential loss. To mitigate these challenges, we have explored the efficacy of GRE (Generic Routing Encapsulation) tunnel utilization. By employing GRE methodology, we can tailor packet length to optimize performance across specific transmission media and service types. Our focus lies particularly on high-interactivity applications crucial for battlefield environments, such as file transfer and video streaming, for both encrypted and unencrypted scenarios. We present the results of comprehensive experiments that have enabled us to identify optimal configurations for various scenarios, ensuring efficient communication.
Determination of electromagnetic field strength in areas of increased sensitivity around radio transmitters
Authors: Matović Ana , Biberović Elmedin , Gligorijević Milan
Published: October 2024

In the modern world, electromagnetic radiation has become very intense, so there is no space on the planet that it does not reach. Thus, the living world and people are continuously exposed to these radiations of different frequencies and wavelengths. In the last thirty years, numerous tests have been carried out in the world's most reputable laboratories, but so far no direct evidence has been found that these radiations are harmful to the human body, unless it is about radiation at small distances from the radiation source. The rapid development of electronic devices and equipment leads to the fact that people live and technical devices function in an environment where electromagnetic interference (EMI - Electromagnetic Interference) is increasingly pronounced. The presence and influence of electromagnetic fields is very harmful to human health. That's why the paper discussed tests to reduce the presence and influence of electromagnetic fields on the human body.
Significant characteristics of lead and alloys with antimony in the production of small arms ammunition
Authors: Papović Miroslav
Published: October 2024

The use of lead and its alloys is significant for military purposes (the production of revolver, handgun, rifle and other bullets). Bullets for small arms ammunition are mostly made of a two component alloy of lead and antimony. Bullets can be made only of lead/antimony alloy (lead bullets) or with a jacket (usually made of CuZn alloy) in which lead and antimony core is placed. Due to the specific purpose, the quality of lead and alloys with antimony must be high in order to provide the required ammunition characteristics: bullet velocity, accuracy (chemical composition and homogeneity of alloys), effects on the target (mass, shape, hardness), bullet weight (chemical components, type of alloys, density), pressure of powder gases (bullet hardness), the reduction of barrel lead process (chemical composition, hardness) … This paper will present the results of the chemical composition (Optical emission spectrometry), hardness according to Vickers HV1 method and densities for two deliveries of refined lead and seven lead/antimony alloys. The obtained results present the characteristics of refined lead and lead/antimony alloys used for production of bullets for small arms ammunition, and are a good basis for designers of bullets for designing products and obtaining defined requirements.
Adsorbing danger: Carbon material combatting organophosphate
Authors: Tasić Tamara , Milanković Vedran , Anićijević Vladan , Pašti Igor , Lazarević-Pašti Tamara
Published: October 2024

Organophosphates are a class of compounds known for their use as chemical warfare agents. These agents have been utilized in military contexts due to their ability to act as nerve agents, disrupting the nervous system's function. However, beyond their military application, organophosphates pose significant risks to human health and the environment. Exposure to these compounds can lead to severe neurological effects and even death in high concentrations. Moreover, organophosphates can persist in the environment, contaminating soil, water, and air, posing long-term risks to ecosystems and public health. Therefore, developing effective strategies for removing organophosphates is crucial. This study investigates the efficacy of carbon material in removing organophosphate malathion from aqueous systems. Carbon material was characterized using SEM and EDX. Experimental results were analyzed using four nonlinear isotherm models: Freundlich, Langmuir, Temkin, and Dubinin-Raduskevic model. The study revealed that 1 g of the examined material could adsorb 18.92 mg of malathion at 25°C. Furthermore, neurotoxicity was accessed, and it was found that treatment with the adsorbent led to a reduction in toxicity. The findings underscore the promising role of carbon material as an effective adsorbent for removing malathion.
Investigation of the dependence of pressure drop and particles flow rate on the particle diameter in spout-fluidized bed
Authors: Stančić Teodora , Đuriš Mihal , Kaluđerović-Radoičić Tatjana
Published: October 2024

The spouted and spout-fluidized bed systems have been designed to overcome the limitations of fluidized systems, particulary where there is a need to utilize large particles in the process. These beds have great significance and are applied for various processes in industry. They are formed by introducing fluid into a column with a packed bed, establishing the vertical transport of particles upwards through the center of the column. The entire packed bed in the annular area slides down as the particles are transported upwards from the bottom of the bed. Sometimes, a central pipe is installed in the axis of the spouted bed column, through which transport occurs, significantly reducing the pressure drop in column and increasing operational efficiency. The aim of the presented paper is the measurement of fluid flowrate, particle flowrate, and pressure drops in spout-fluidized bed with a central pipe, at a certain distance from the bottom of the bed. Glass particles were used for these measurements, and their characterization was performed initially. Fluid flow was varied in the annulus and central pipe, followed by measurements of pressure drops.
Investigation of the possibility of aplication of bioindicators in reduction level contcentrations of radiological contaminants
Authors: Pajić Nataša , Senić Željko , Bauk Sonja
Published: October 2024

Bioindication and biomonitoring imply the use of biological parametters to monitor the state and quality of environment. The main task of biomonitoring program is to define appropriate indicators, whose presence and specific behavior will indicate effects of environmental and ecosystem disturbances. Biological indicators are unique indicators of state of environment, which give a signal about the ecological status of ecosystem. Using bioindicatore as an early warning sign of radiological accident can help in conservation environment. The presented results indicate that lichens are good bioindicators of environmental pollution with radioactive isotope (137Cs). Higher level of ( 137Cs) on our territory was indicated on Chernobyl accident, what is shown by measurement of activities of samples in this study.