bluuebunny/crossref_metadata_2025 huggingface dataset:
Cultivo de dorada (Brycon sinuensis Dahl, 1955) en jaulas flotantes a diferentes niveles de proteína
Authors: Mercado Burgos Ingris , García José Luis , Rosado Cárcamo Robinson , Olaya Nieto Charles W. , Segura Guevara Fredys F. , Brú Cordero Samir B. , Tordecilla Petro Glenys
Published: August 2024

Resumen
Se evaluó el cultivo de dorada (Brycon sinuensis) en jaulas flotantes durante 180 días. Se determinó el crecimiento mediante la ganancia en longitud, ganancia en peso, tasa de crecimiento específico, sobrevivencia final, biomasa total, factor de condición y factor de conversión alimenticia. Se sembraron 816 juveniles con talla promedio de 17.8 cm de longitud total y peso promedio de 78.7 g, en cuatro tratamientos con densidad de siembra de 25 peces/m3 y tres réplicas cada uno. Las dietas balanceadas (proteína bruta) suministradas fueron: tratamiento 1: 20%; tratamiento 2: 32%; tratamiento 3: 28%; y tratamiento 4: 24%, con diseño experimental completamente aleatorio. Se puede afirmar que la dorada consumió las dietas de origen vegetal de igual manera que las de origen animal, sin embargo la dieta del 28% de proteína bruta (tratamiento 3) muestra los mejores resultados, sin diferencias significativas entre tratamientos (p > 0.05). En todos los trabajos anteriores, la ganancia en peso diaria fue baja, pero  mejor que las obtenidas en esta investigación. Mientras que el rendimiento en biomasa fue mayor que los reportados para cultivos en estanques, para todos los tratamientos en este estudio fue muy bajo.
Summary
Dorada´s culture (Brycon sinuensis) in floating cages during 180 days was evaluated. The increment in length, increment in weight, specify growth rate, final survival, total biomass, condition factor and nutritional conversion factor were determinated. 816 fishes with mean length of 17.8 cm total length and mean weight of 78.9 g were stocked in four treatments with stocking densities of 25 ishes/m3 and three replica each one. The balanced diets (gross protein) supplied were: treatment 1: 20%, treatment 2: 32%, treatment 3: 28%, and treatment 4: 24%, with experimental design random completely. Can be affirmed that the dorada fed the diets of vegetable origin as equal way than those of animal origin, although the diet of 28% gross protein (treatment 3) shows best perfomance, without significant differences between treatments (p > 0.05). In other works with this species, the daily gain in weight was low, but better than the one obtained in this work; whereas the biomass yield was greater than the biomass yield reported for ponds cultures, the results of this study were very low.
Efecto del peso corporal sobre el consumo de oxígeno en yamú (Brycon amazonicus Spix & Agassiz 1829): reporte preliminar
Authors: Valbuena Mónica , Velasco Santamaría Yohana , Cruz Casallas Pablo
Published: August 2024

Resumen Con el propósito de evaluar los efectos del peso corporal sobre el consumo de oxígeno en yamú (Brycon amazonicus), ejemplares de 100, 200, 400, 800 y 1600 g de peso corporal fueron alojados en un respirómetro de 172 L de capacidad y registrado el consumo de oxígeno cada cinco minutos durante dos a cuatro horas, utilizando una sonda multiparamétrica YSI 556. La temperatura del agua se mantuvo a 28 ± 1 °C. Los resultados mostraron una relación inversa entre la tasa de consumo de oxígeno y el peso corporal, ya que los animales de menor talla registraron un mayor consumo de oxígeno por unidad de peso que aquellos de pesos superiores. Esta relación generó la siguiente ecuación de regresión: Y= 583.7 - 64.9 Ln(X), donde Y es el consumo de oxígeno en mg/kg/h y Ln(X) el logaritmo natural del peso corporal expresado en gramos (r2 = 0.92, n = 5). Summary With the aim to evaluate the effects of the body weight on the oxygen consumption in yamu (Brycon amazonicus), fish of 100, 200, 400, 800 and 1600 g of body weight were maintained in a respirometer with a capacity of 172 L and the oxygen consumption was register each 5 min during 2 to 4 h, using a multi-probe system YSI 556. The water temperature was maintained at 28 ± 1°C. The results showed an inverse relationship between the oxygen consumption and the body weight, because the animals of smaller size registered a higher oxygen consumption for unit of body weight than those of superior size. This relationship generated the following regression equation: Y = 583.7 - 64.9 Ln(X), where Y is the oxygen consumption in mg.kg-1.h-1 and Ln(X) the natural logarithm of the corporal weight expressed as grams (r2 = 0.92, n = 5).
Detección de antígenos de Dirofilaria immitis en caninos del Área Metropolitana del Valle de Aburrá
Authors: Orozco P. Sonia C. , Arango María , Cardona Wilder
Published: August 2024

Resumen
Con el fin de determinar la presencia o ausencia de antígenos del nemátodo Dirofilaria immitis en caninos del Valle de Aburrá mayores de un año, se muestrearon 300 perros mediante la técnica de inmunocromatografía de flujo lateral. 285 muestras cumplieron los criterios de inclusión y exclusión; de estas, una fue positiva a Dirofilaria immitis. Se correlacionaron las variables de edad, sexo, tipo de alojamiento, desparasitación en los últimos tres meses, historial de viajes y función zootécnica.  No se encontró diferencia estadística significativa (p > 0.05) entre la positividad a la dirofilariosis y cualquiera de las variables estudiadas.  La frecuencia del parásito Dirofilaria immitis en el área Metropolitana del Valle de Aburrá fue del 0.35%, concluyéndose que esta enfermedad no es endémica en el área de estudio.
Summary
Our goal was to determine the presence or absence of the nematode Dirofilaria immitis in over-one-year old dogs of the Metropolitan area of the Aburra Valley.  300 dogs were tested with an inmunochromatography lateral flow kit.  285 samples fulfilled the inclusion and exclusion criteria, finding only one dog positive.  It was concluded that this disease is not endemic in the studied area.
Evaluación cariotípica de un grupo de búfalos en Fredonia, Antioquia (Colombia)
Authors: Alzate R. Mónika M. , López Juan B. , Márquez María E.
Published: August 2024

Resumen
En el presente trabajo se realizó la caracterización citogenética de búfalos por bandas R-replicativas, con el fin de conocer su número cromosómico, para así realizar su clasificación ya sea como búfalo de río o de  pantano. También se buscó la existencia de híbridos, los cuales podrían ser un obstáculo al implementar programas de reproducción de estos animales, dado que los búfalos son una excelente alternativa debido a la alta producción de leche y carne que ofrecen, además de ser muy eficientes en trabajos de tracción. Se muestrearon 25 ejemplares, 13 machos y 12 hembras de los cuales se realizaron cultivos celulares de linfocitos de sangre periférica estimulados con fitohemaglutinina y tratados con un pulso terminal de 5-bromo2´-deoxiuridina (BrdUrd) para obtener extendidos cromosómicos y obtener bandas R-replicativas. El análisis citogenético de cada una de las muestras reveló un número diploide de 2n=50, lo que los clasifica como búfalos de río (Bubalus bubalis). El ordenamiento del cariotipo de los cromosomas homólogos fue clasificado de acuerdo a la nomenclatura internacional de la siguiente manera: 1 par acrocéntrico, 3 pares submetacéntricos, 1 par metacéntrico y 19 subtelocéntricos, incluyendo los cromosomas sexuales X y Y. El número total de los cromosomas se distribuyó en 3 grupos: grupos A y B autosómicos y el par sexual, ordenados de mayor a menor. De los resultados analizados, no se obtuvieron individuos producto del cruce entre parentales con número cromosómico diferente.
Summary
Buffalos are an excellent alternative for milk and meat production as well as for efficient  traction. The cytogenetic characterization of buffalos was made by the R-replicatives bands system, to determined the cromosomic number and classify the animals as river buffalo or mud buffalo. We were also interested in the  possible presence of hybrids since this could be an obstacle to improve breeding and reproduction programs. Twentyfive animals (13 males and 12 females) were sampled. Peripheral blood lymphocytes were cultured out of each one of the individuals and were stimulated with phytohemaglutinin, with a terminal pulse of 5-bromo2-deoxiuridine (BrdUrd) to obtain extended chromosomal and R-replicatives bands. The cytogenetic analysis of each sample revealed a diploid number of 2n=50, which classifie the animals as river buffalos (Bubalus bubalis). The ordering of the homologue chromosomes allowed the classification according to the international nomenclature as follows: 1 acrocentric pair, 3 submetacentric pairs, 1 metacentric pair and 19 subtelocentric pairs including sexual chromosomes X and Y. The total number of chromosomes, ordered from the largest to the samallest, were distributed in 3 groups: group A and B, autosomic and the sexual pair. No hybrids were observed in this study.
Evaluación productiva y análisis microeconómico del maní forrajero perenne (Arachis pintoi) en un sistema de levante-ceba de porcinos en confinamiento
Authors: Posada Sandra L , Mejía Jaime , Noguera Ricardo , Cuan Margarita M. , Murillo Lina M.
Published: August 2024

Resumen
Con el fin de evaluar la respuesta productiva y microeconómica del maní forrajero (Arachis pintoi) como reemplazo parcial de la proteína cruda en cerdos en las etapas de levante y ceba, se realizó una investigación con 12 hembras, divididas al azar en cuatro tratamientos: T1. Grupo testigo, alimentado con concentrado comercial; T2, T3 y T4, con 10, 20 y 30%, respectivamente, de reemplazo de la proteína de la dieta a partir de maní.  Las variables evaluadas fueron consumo de alimento, peso corporal, ganancia diaria de peso, grasa dorsal, conversión alimenticia y la relación valor del alimento/valor de la ganancia de peso.  No se encontró diferencia estadística significativa entre los diferentes tratamientos para todas las variables evaluadas, excepto para el promedio de la ganancia diaria de peso durante la etapa de levante (p < 0.01), la cual reportó los mayores valores para el T1 (1.01 kg) y los menores para T4  (0.78 kg /animal/día ).  En el análisis microeconómico se observó que el menor costo asociado con la producción de 1 kg de cerdo en pie se obtuvo para el T3, siendo 45% más bajo con respecto al T1. El comportamiento de la utilidad parcial bruta fue superior para el T3, estando un 46% más alta en relación con el T1, que fue el tratamiento que mejor desempeño presentó en la conversión alimenticia.
Summary
To make an evaluation of the productive and micro-economic aspects of Arachis pintoi as  a partial replacement  of crude protein in pigs a group of 12 female pigs & was studied under four randomly asigned subgroups: T1: Witness group, was fed commercial concentrate; in subgroups T2, T3 and T4, 10, 20 and 30%, respectively,  of their dietary protein was replaced by Arachis pintoi.  The evaluated variables were intake, corporal weight, daily gain of weight, back fat, nutritional conversion and the relation between the feed cost and the value of the weight gained. The results indicate that there were no significant statistical differences between the different treatments for any of the evaluated variables, except for the average daily weight gained during the raising stage (p < 0.01), with the greater values for T1 (1.01 kg/animal/day) and the lowest for T4 (0.78 kg/animal/day). The microeconomic analysis shows that the smaller cost associated to the production of 1 kg of pig was obtained for T3, 45% with respect to T1.  The behavior of the gross  partial gain was superior for  T3, 46% higher than T1. This was therefore the treatment presenting the better conversion.
Polimorfismos de BoLA-DRB3 en el bovino sintético colombiano Lucerna y asociación con conteo de células somáticas y mastitis
Authors: Gómez Castro Santiago , Trujillo Bravo Esperanza , Duran Carlos Vicente
Published: August 2024

Resumen
En bovinos se han determinado asociaciones de BoLA-DRB3 con enfermedades infecciosas y con el conteo de células somáticas. En este estudio fue analizada la raza sintética colombiana Lucerna, para el microsatélite DRB3 intrón 2. Fueron identificados 24 alelos por amplificación con PCR y geles de poliacrilamida, encontrando frecuencias alélicas desde 0.02 hasta 0.26. El alelo mas frecuente en la población analizada fue el 161, y el menos frecuente 159. Ambas subpoblaciones afectadas y no afectadas por mastitis, presentaron frecuencias similares para la mayoría de los alelos. La población no se encuentra en equilibrio H.W (Hardy- Weinberg). (p < 0.05), y presentó déficit de heterocigóticos. El valor medio de recuento de células somáticas transformado (log2 (CCS / 100000 ) + 3),  para la población total fue de 4.8 (+/- 2.89) y para cada subpoblación de afectadas y no afectadas fue de 5.76 y 3.86, respectivamente. Se estudiaron las asociaciones potenciales entre los alelos BoLA-DRB3, el recuento de células somáticas y la mastitis clínica, y se encontrando una asociación significativa (p < 0.05) entre el  alelo 191 con un alto conteo de células somáticas. No se encontró asociación significativa entre el alelo 191 y la enfermedad, pero si hubo significancia estadística (p < 0.05) para  la asociación de la mastitis con las variables hato y número de partos.
Summary
Previous studies have demostrated an association between BoLA-DRB3, infectious diseases and somatic cells counts in cattle. Polymorphism at the level of the microsatellite intron 2 of synthetic Bovine  Colombian Lucerna was investigated. Twentyfour alleles were identified using PCR and poliacrylamide gels; their frequencies ranged from 0.02 to 0.26 among 308 individuals studied. Allele 161 was the most frequent and 159 was the least prevalent. Both subgroups mastatis affected and non affected presented similar frequencies for most alleles, indicating that the population is not in hardy Weinberg equilibrium (p <  0.05). The mean somatic cells score (log2 (CCS / 100000) + 3) for the population was 4.8(+/- 2.89). There was found a significant association between allele 191 and high somatic cell scores but not with clinical mastitis. But mastitis did present a significant association with the variables herd and number of deliveries.
New approaches to control foot-and-mouth disease: antivirals and novel vaccines
Authors: Grubman Marvin J.
Published: August 2024

Summary
Foot and mouth disease (FMD) is a highly contagious viral-induced disease of cloven-hoofed animals that results in serious economic consequences in affected countries that have a significant international livestock trade.  Currently disease control measures include inhibition of susceptible animal movement, slaughter of infected and susceptible in-contact animals, disinfection, and possibly vaccination with an inactivated whole virus antigen. However, there are a number of problems with use of the current vaccine in outbreaks in countries which have been previously free of FMD. As a result countries which vaccinate face a longer delay in regaining FMD-free status than countries which do not vaccinate but rather slaughter all infected or susceptible in-contact animals. Researchers have been attempting to develop both new FMD vaccines to overcome the limitations of the current inactivated vaccine as well as methods to more rapidly induce a protective response. In this manuscript I discuss the most effective new FMD vaccines and novel antiviral strategies that are currently being examined.
Resumen
La fiebre aftosa es una enfermedad viral altamente contagiosa, que afecta a los animales de pezuña hendida y produce pérdidas económicas importantes, afectando el comercio internacional pecuario de los países que la padecen. En la actualidad las medidas de control para esta enfermedad incluyen la restricción del movimiento de animales susceptibles, el sacrificio de animales infectados y aquellos susceptibles que entran en contacto con los infectados, la desinfección y la posible vacunación con un antígeno viral completo inactivado. No obstante, existen varios problemas con el uso de las vacunas disponibles durante los brotes en países que habían sido considerados previamente libres de la enfermedad. Como resultado de lo anterior, los países que vacunan, enfrentan una demora significativa en obtener nuevamente el estado de "país libre" de fiebre aftosa, a diferencia de aquellos que no vacunan y deciden sacrificar todos sus animales infectados o los susceptibles que se exponen a la infección. Los científicos han estado tratando de desarrollar nuevas vacunas para superar las limitaciones de las actuales vacunas inactivadas, a la vez que se intentan desarrollar nuevos métodos para inducir una respuesta inmune protectora más rápida. En este documento se discuten, nuevas vacunas que son más efectivas para controlar la fiebre aftosa e igualmente, estrategias antivirales novedosas que están actualmente en investigación.
Torsión uterina causada por un hemangioma cavernoso en una hembra canina
Authors: Báez S. Paola , Ruiz S. Isabel
Published: August 2024

Resumen
Una perra criolla  de ocho años de edad, fue llevada  a consulta externa del consultorio veterinario, presentando una marcada distensión abdominal, vómito e inapetencia. La paciente fue sometida a laparotomía exploratoria y se diagnosticó torsión uterina con presencia de una masa en el cuerno uterino izquierdo. El estudio histopatológico de la masa dió como resultado un  hemangioma cavernoso.
Summary
We reported here a case of a female dog, eight years old, mixed breed. It was gone at University of Antioquia Hospital presenting vomiting, abdominal distension and lost of appetite. The patient was admitted to the surgery unit for abdominal exploratory surgery and it was found a mass in the left uterine horn. The histopatologic study was a cavernus hemangioma.
TRENDS IN THE DEVELOPMENT OF ARTIFICIAL INTELLIGENCE IN UKRAINE
Authors:   Taras Shevchenko National University of Kyiv, Kyiv, Ukraine, Gaina George
Published: August 2024

In recent years, artificial intelligence technologies have begun to be used in many types of human life: education, medicine, business, finance, management, marketing, industry, etc., and have become a key trend of the time. The article provides information and analyzes the current state and trends in the development of artificial intelligence in Ukraine. An analysis of the strategy for the development of artificial intelligence, which is proposed by a number of ministries, considered the concept of development of artificial intelligence, which is proposed by the State Agency for e Government. Data on companies working in the field of artificial intelligence are analyzed and provided. The main activities of Ukrainian companies in the field of artificial intelligence, including a number of Ukrainian startups, have been identified. Provides information on scientific schools and research conducted in the field of artificial intelligence in Ukraine. It is established that the main research focuses on the following areas: neural networks, pattern recognition, mathematical informatics, creation of intelligent information systems and knowledge bases, development of intelligent robotic systems, knowledge-oriented technologies, intelligent search, development of intelligent learning systems, big data analysis, fuzzy systems decision support, multi-agent systems and much more. In general, scientific research conducted in Ukraine in the field of artificial intelligence covers the basis of areas of work that correspond to research in the world. Also in the article the directions of dissertation researches for the last years on intellectual systems and systems of artificial intelligence are analyzed. The main areas in which the dissertation research was performed: intellectual analysis and data processing, knowledge processing and multi-agent technologies, intelligent technologies, including intelligent technologies to support acceptance, image recognition and a number of others.
ANALYSIS OF RTB PLATFORMS FOR AUTOMATING THE PURCHASE AND SALE OF MEDIA CONTENT
Authors:   Taras Shevchenko National University of Kyiv, Kyiv, Ukraine, Korotin Denis , Popereshnyak Svitlana ,   Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
Published: August 2024

In the article analyzes RTB platforms for automating the buying and selling of media content. According to the results of the analysis, the purpose of scientific research is formed, which consists of the analysis and substantiation of the expediency of using DSP-SSP platforms. For achieve this goal, an analysis of Programmatic and RTB platform technologies, the advantages and disadvantages of auctions and direct procurement, the order of operation of the DSP and RTB auction was conducted. In the article found that RTBs interact with advertising sites or exchanges that sell their inventory, advertisers or agencies interested in buying this inventory, as well as site visitors. In the article determines that, unlike the old model of media purchases, RTB does not put up for sale an advertising place, but advertising materials for a very specific visitor, which makes it possible to buy only the target audience. It turned out that the interests of sites at the auction represent Sell Side Platform (SSP). Where through the SSP, the sites auction their advertising inventory. Thanks to SSP, website owners automatically sell ad impressions to a large number of advertisers at the maximum price. In SSP stores information about advertising platforms, ad formats, and information about site visitors. The focus is that at the same time, the interests of advertisers at the auction represent Demand Side Platforms (DSP). It was found that DSP simplify the process of buying advertising on a large number of advertising exchanges, allow flexible control of the price of impressions and customize advertising campaigns, collect bids, settings and creative's of all advertisers participating in the auction. It is concluded that, according to eMarketer, programmatic advertising is gaining popularity in the Ukrainian media market. The authors identified the advantages and disadvantages of using DSP. The attention is focused on the advantages, which include: high efficiency; Use of CRM or DMP data management platforms precise targeting capabilities; support beyond traditional customer support of the same network; high quality inventory. Deficiencies to which are assigned are identified – high cost and complexity.
MOBILE APPLICATION DEVELOPMENT FOR BLIND PEDESTRIANS TO PREVENT ROAD DANGERS
Authors:   Taras Shevchenko National University of Kyiv, Kyiv, Ukraine, Andriievskyi Denys , Shevchenko Viktor ,   Taras Shevchenko National University of Kyiv, Kyiv, Ukraine, Petrivskyi Volodymyr ,   Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
Published: August 2024

According to the last statistic researches approximately more than one billion people worldwide live with some form of visual impairment. In turn, visual impairments limit people's ability to perform daily functions and affect their quality of life and ability to interact with the world around them. In the article mobile application development for blind pedestrians to prevent road dangers is presented. Short overviews of similar applications like Alexa, Via Opta Nav, and Object Detector are described. Each of described programs has disadvantages like limited use area, real-time object detection absence, use third-party or physical devices need. As a result, the main task of the study is to investigate modern hazard classification algorithms, improve the accuracy of the algorithm and develop software that will be able to identify hazards in real-time, does not require physical devices, and is operated using the simplest possible interface. For solving presented above problem solution based on MobiNetV2 and InceptionV3 open-source models for defining objects in a photo modification is presented. The presented solution consists of several steps like image input with further preprocessing, optimization and result processing. For the image input hosts receive data from the file system or local memory, perform any preprocessing, and then transmit the preprocessed data to the TPU cores. Preprocessing calls the parser, which in turn calls the parser function, where images are preprocessed. For the optimization stochastic gradient descent optimization and momentum optimizer are used. As a result, method of image classification for real-time hazard identification has been further developed. A model layer was developed that interprets the unbalanced results of the model and provides the necessary results to prevent accidents, which increased accuracy by 20%. A mobile application for road hazard recognition for blind pedestrians has been developed using the above. Presented results confirm the efficiency of the described approach. Also, described model and approach can be improved in further investigations.
Rate prediction of decrease in the luminous flux of green InGaN/GaN LEDs during current tests according to the P-I characteristics parameters
Authors:   Kotel'nikov Institute of Radioengineering and Electronics of RAS, Ulyanovsk Branch, Frolov Ilya V.
Published: August 2024

Changes in the characteristics of commercial green InGaN/GaN LEDs were investigated when tested under the influence of a pulsed current of increased density for 160 hours and a constant maximum permissible current for 5000 hours. It was shown that the decrease in the luminous flux of the LEDs is accompanied by an increase in the parameter of the function that approximates the P-I characteristic of the LED in the range of microcurrents, which is proportional to the defects density in the LED heterostructure. A strong correlation has been established between the initial value of this parameter and the magnitude of the decline in the luminous flux of LEDs during testing. It has been determined that the parameter of the function that approximates the P-I characteristic of an LED in the low current range can be used as a diagnostic parameter to predict the rate of decline in the luminous flux of an LED during current tests.
Determination of viscosity and dielectric constant of liquids using the equivalent circuit method using a resonator with a lateral electric field
Authors:   Kotel'nikov Institute of Radioengineering and Electronics of. RAS, Saratov branch, Borodina Irina A. , Zaitsev Boris D. ,   Kotel'nikov Institute of Radioengineering and Electronics of. RAS, Saratov branch, Teplykh Andrey A. ,   Kotel'nikov Institute of Radioengineering and Electronics of. RAS, Saratov branch, Semyonov Alexander P. ,   Kotel'nikov Institute of Radioengineering and Electronics of. RAS, Saratov branch
Published: August 2024

The paper presents a method for determining the viscosity and permittivity of a liquid using the equivalent circuit method. The parameters of the Mason equivalent circuit were found for a piezoelectric resonator with a lateral electric field made of PZT-19 ceramics. The frequency dependences of the real and imaginary parts of the electrical impedance of a resonator loaded with liquid samples with different viscosity and permittivity were measured. The fitting of the theoretical frequency dependences of the real and imaginary parts of the electrical impedance of a resonator loaded with mixtures of “water - isopropyl alcohol” and “water - glycerin” to the measured dependences was carried out. As the result the dependence of the permittivity of the liquid on the additional capacitance (determined from the Mason scheme) and the dependence of the shear fluid viscosity on the imaginary part of the mechanical impedance of the fluid load (determined from the Mason scheme) were built. These dependences can be used as calibration curves to determine dielectric constant and viscosity.
Clustering of epileptiform discharges in the individual diagnosis of the early stage of delayed cerebral ischemia
Authors:   Kotel'nikov Institute of Radioengineering and Electronics of Russian Academy of Sciences, Obukhov Yury V. , Kershner Ivan A. ,   Kotel'nikov Institute of Radioengineering and Electronics of Russian Academy of Sciences, Okuneva Irina V. ,   Sklifosovsky Research Institute of Emergency Medicine, Sinkin Mikhail V. ,   Sklifosovsky Research Institute of Emergency Medicine, Sokolov Aleksandr Yu. ,   Moscow Institute of Physics and Technology
Published: August 2024

To detect the onset of delayed cerebral ischemia after aneurysmal hemorrhage in the subarachnoid space, a clinical data method for detecting clusters of epileptiform discharges in the data of long-term electroencephalographic monitoring of patients was proposed and tested. It is based on the identification of distributions of epileptiform discharges that are continuous in time and exceed the adaptive threshold and have a clearly expressed interhemispheric asymmetry.
Triplet superconducting correlations of hybrid mesa-structure with bi-layer ferromagnetic interlayer
Authors:   Kotel’nikov Institute of Radioengineering and Electronics of RAS, Constantinian Karen Y. , Ovsyannikov Gennady A. ,   Kotel’nikov Institute of Radioengineering and Electronics of RAS, Kislinskii Yulii V. ,   Kotel’nikov Institute of Radioengineering and Electronics of RAS, Petrzhik Andrey M. ,   Kotel’nikov Institute of Radioengineering and Electronics of RAS
Published: August 2024

We present results on electron transport in hybrid Josephson mesa-structure Sd/F1F2/S, consisting of epitaxial films of cuprate superconductor YBa2Cu3O7-δ (Sd), bi-layer ferromagnetic interlayer (F1F2), thin film of metallic Nb was deposited on the top of a thin protective Au film layer used as the upper superconducting electrode (S). The long-range triplet component of superconducting correlations arises when strontium ruthenate SrRuO3 F1 and manganiteLa0.7Sr0.3MnO3 with non-collinear magnetizations are used as ferromagnetic material F2. Superconducting current took place up to the thickness d = 52 nm of the F1F2 interlayer. Superconducting current disappeared in the case of a single ferromagnetic interlayer of manganite (La0.7Sr0.3MnO3 or La0.7Ca0.3MnO3) and SrRuO3 with minimized thicknesses, limited by the occurrence of pinholes. The magnetic field properties of mesa-structure are discussed as well, along with the impact of the second harmonic in the superconducting current-phase relation.
Holographic method for processing hydroacoustic signals from a high-frequency source in shallow water
Authors:   Prokhorov Institute of General Physics of RAS, Kuz’kin Venedikt M. , Pereselkov Sergey A. ,   Voronezh State University, Grachev Vladimir I. ,   Kotel'nikov Institute of Radioengineering and Electronics of RAS, Logachev Vladimir V. ,   Voronezh State University, Kosenko Ivan M. ,   Voronezh State University
Published: August 2024

The paper presents a method for holographic processing of high-frequency hydroacoustic signals using a vector-scalar receiver in shallow waters. The results of theoretical analysis and numerical modeling are presented. Interferograms and holograms for various components of oscillatory velocity and sound pressure are analyzed. It is shown that noise signals holographic processing using a vector-scalar receiver allows detecting a source and estimating a bearing. The results of the method verification in a numerical experiment are presented.
A Roadmap to Seamless Connectivity via the Integration of 5G and Radio Access Networks
Authors:   Al-Kitab University, Mohammed Ali Ali Saber , Shakor Pshtiwan ,   Al-Qalam University College, Abdullah Salam Khalaf ,   Al-Nukhba University College, Mohammed Marwan Aziz ,   Knowledge University, College of Engineering, Abbas Saad Jabbar ,   Al-Rafidain University College, Salman Hayder Mahmood ,   Al-Turath University College, Mohammed Mohammed Abdulkreem ,   Alnoor University College, Kalmatov Romanbek K. ,   Osh State University
Published: August 2024

Background: Due to the rising prevalence of smart devices and the need for dependable, high-speed internet connections, it is imperative to enhance existing network infrastructures. The fundamental framework of mobile telephony, referred to as RAN (Radio Access Network), needs help fulfilling these requirements due to its restricted capacity and concerns over scalability. Objective: The purpose of this research is to investigate the capabilities of 5G technology in addressing these restrictions, with a specific focus on integration techniques, advantages, and obstacles. Methodology: The study used a mixed-method approach to assess the efficacy and feasibility of incorporating 5G-RAN. This is achieved by integrating quantitative data from pilot studies with qualitative literature analysis. Results: The findings suggest that using 5G technology results in substantial improvements in data transfer rates, reduced latency, enhanced network reliability, scalability, and lowered latency. However, several obstacles have been identified, including the significant costs linked to infrastructure, issues around interoperability, and security concerns. Conclusion: Integrating 5G and RAN provides a feasible approach to achieving uninterrupted connectivity, leading to significant advantages in many industries. However, overcoming the challenges above is essential to ensure this technology's effective implementation and general acceptance.
Rate prediction of decrease in the luminous flux of green InGaN/GaN LEDs during current tests according to the P-I characteristics parameters
Authors:   Институт радиотехники и электроники им. В.А. Котельникова РАН, Ульяновский филиал, Фролов Илья В.
Published: August 2024

Исследованы изменения характеристик коммерческих зеленых InGaN/GaN светодиодов при испытаниях под действием импульсного тока повышенной плотности в течение 160 ч и постоянного максимально допустимого тока в течение 5000 ч. Показано, что спад светового потока излучения светодиодов сопровождается увеличением параметра функции, аппроксимирующей ватт-амперную характеристику светодиода в диапазоне микротоков, который пропорционален концентрации дефектов в светодиодной гетероструктуре. Установлена сильная корреляционная связь между начальным значением этого параметра и величиной спада светового потока светодиодов при испытаниях. Определено, что параметр функции, аппроксимирующей ватт-амперную характеристику светодиода в диапазоне малых токов, может быть использован в качестве диагностического параметра для прогнозирования темпа спада светового потока излучения светодиода при токовых испытаниях.
Study of the slot mode in a structure including a delay line and a resonating piezoelectric plate
Authors:   Институт радиотехники и электроники им. В.А. Котельникова РАН, Саратовский филиал, Зайцев Борис Д. , Теплых Андрей А. ,   Институт радиотехники и электроники им. В.А. Котельникова РАН, Саратовский филиал, Бородина Ирина А. ,   Институт радиотехники и электроники им. В.А. Котельникова РАН, Саратовский филиал, Семёнов Александр П. ,   Институт радиотехники и электроники им. В.А. Котельникова РАН, Саратовский филиал
Published: August 2024

Представлены результаты экспериментального и теоретического исследования структуры, включающей линию задержки на основе пластины ниобата лития Y-X среза с двумя встречно-штыревыми преобразователями для возбуждения и приема акустической волны с поперечно-горизонтальной поляризацией в диапазоне частот 1.5 – 2.2 МГц. Толщина пластины составляла 0.35 мм. Над линией задержки между преобразователями с некоторым зазором располагалась резонирующая пластина ниобата лития. Исследовались резонирующие пластины Z-X, Y-X–140° и Y-X+155° кристаллографических срезов. При подаче ВЧ напряжения навходной преобразователь на частотной зависимости полных потерь наблюдались ярко выраженные пики резонансного поглощения. Установлено, что с ростом ширины зазора между пластинами глубина резонансных пиков монотонно уменьшается и пики плавно исчезают. При этом для большинства пиков с ростом ширины зазора добротность уменьшается. Проведенный теоретический анализ таких структур показал хорошее соответствие теоретических результатов экспериментальным данным. Разработанная структура показывает перспективу ее использования для многопараметрического анализа различных жидкостей.
Radar method of aircraft angular position estimation based on the use of sounding signals vector properties
Authors:   Томский государственный университет систем управления и радиоэлектроники, Гулько Владимир Л. , Мещеряков Александр А. ,   Томский государственный университет систем управления и радиоэлектроники
Published: August 2024

Рассматривается радиолокационный моноимпульсный метод определения углов пеленга и крена летательного аппарата с использованием пассивного радиомаяка с заданными поляризационными характеристиками рассеяния, в котором отраженный радиоимпульс содержит полную информацию об навигационных элементах полета летательного аппарата. Пассивный радиомаяк представляет собой два пространственно разнесенных в горизонтальной плоскости радиолокационных поляризационно-анизотропных трехгранных уголковых отражателей с горизонтальной и вертикальной собственными поляризациями соответственно. Для определения углов пеленга и крена летательного аппарата используются зондирующие импульсные сигналы, линейная плоскость поляризации которых составляет угол π/4 с горизонтальной плоскостью. Оценка пеленга летательного аппарата осуществляется в этой плоскости по одному отраженному радиоимпульсу на выходе двухканального приемного устройства по измеренной разности фаз между горизонтальной и вертикальной поляризованными составляющими принятого сигнала. Оценка угла крена производится по измеренному отношению амплитуд ортогонально линейно поляризованных составляющих. Получены аналитические выражения для определения углов пеленга и крена летательного аппарата.
Clustering of epileptiform discharges in the individual diagnosis of the early stage of delayed cerebral ischemia
Authors:   Институт радиотехники и электроники им. В.А. Котельникова РАН, Обухов Юрий В. , Кершнер Иван А. ,   Институт радиотехники и электроники им. В.А. Котельникова РАН, Окунева Ирина В. ,   НИИ скорой помощи им. Н.В. Склифосовского, Синкин Михаил В. ,   НИИ скорой помощи им. Н.В. Склифосовского, Соколов Александр Ю. ,   Московский физико-технический институт
Published: August 2024

Для обнаружения начала развития отсроченной церебральной ишемии после аневризматического кровоизлияния в субарахноидальное пространство предложен и апробирован на клинических данных способ обнаружения кластеров эпилептиформных разрядов в данных длительного электроэнцефалографического мониторинга пациентов. Он основан на выделении непрерывных во времени и превышающих адаптивный порог распределений эпилептиформных разрядов и имеющих четко выраженную межполушарную асимметрию.
New markers of delayed cerebral ischemia resulting from non-traumatic subarachnoid hemorrhage in the lower delta range of electroencephalograms
Authors:   Институт радиотехники и электроники им. В.А. Котельникова РАН, Сушкова Ольга С. , Морозов Алексей А. ,   Институт радиотехники и электроники им. В.А. Котельникова РАН, Синкин Михаил В. ,   НИИ скорой помощи им. Н.В. Склифосовского, Окунева Ирина В. ,   НИИ скорой помощи им. Н.В. Склифосовского, Обухов Юрий В. ,   Институт радиотехники и электроники им. В.А. Котельникова РАН
Published: August 2024

Проанализированы электроэнцефалографические (ЭЭГ) данные 14 пациентов, проходивших лечение в отделении интенсивной терапии НИИ скорой помощи им. Н.В. Склифосовского по поводу нетравматического субарахноидального кровоизлияния. В ходе лечения у 4 пациентов была диагностирована отсроченная ишемия головного мозга, возникшая в послеоперационный период. У 10 пациентов отсроченная ишемия не возникла. Сравнение ЭЭГ-данных указанных пациентов с помощью метода анализа всплескообразной электрической активности выявило отличие ЭЭГ пациентов с отсроченной ишемией головного мозга в частотном диапазоне 0.1-1.5 Гц вейвлет-спектрограмм. Установлено, что ЭЭГ пациентов с отсроченной ишемией содержат всплески в нижнем дельта-диапазоне вейвлет-спектрограмм, не характерные для пациентов без отсроченной ишемии (AUC = 0.92). Кроме того, показано, что всплески в нижнем дельта-диапазоне с определёнными параметрами, типичными для пациентов без отсроченной ишемии, не характерны для пациентов с отсроченной ишемией (AUC = 0.11). Таким образом, были обнаружены два маркёра развития отсроченной ишемии после субарахноидального кровоизлияния. Выявлена отрицательная корреляция между количеством всплесков, характерных для пациентов с отсроченной ишемией, и количеством всплесков, характерных для пациентов без отсроченной ишемии (тест Спирмена, p-value < 0.0001).
Magnetite as a functional filler of elastomer composites: effects of dimensionality and structuring
Authors:   Институт радиотехники и электроники им. В.А. Котельникова РАН, Фионов Александр С. , Хачатуров Арам А. ,   МИРЭА-Российский технологический университет, Колесов Владимир В. ,   Институт радиотехники и электроники им. В.А. Котельникова РАН, Потапов Евгений Э. ,   МИРЭА-Российский технологический университет, Сафонов Сергей С. ,   Институт радиотехники и электроники им. В.А. Котельникова РАН, Тлегенов Рустем ,   Институт радиотехники и электроники им. В.А. Котельникова РАН, Корнев Юрий В. ,   Институт прикладной механики РАН
Published: August 2024

Изготовлены образцы композиционных материалов на основе магнетита Fe3O4 с различным размером частиц (природного и измельченного в планетарной мельнице) и различных эластомерных матриц (хлоропреновый каучук серного регулирования – ПХП, бутадиен-стирольный каучук – БСК и полидиметилсилоксан холодного отверждения – СКТН-А) в диапазоне концентраций 10…200 массовых частей на 100 массовых частей эластомерной матрицы. Изучена кинетика отверждения рассматриваемых эластомерных композиций, на основе которой предложены оптимальные режимы формования. Формование образцов выполняли как в присутствии магнитного поля до 0.3 Тл, так и без такового. Исследованы функциональные (электрофизические и магнитные) свойства образцов и показано, что эти свойства в широком диапазоне значений можно регулировать изменением размера частиц магнетита и/или их структурированием.
Adaptive algorithm for localizing underwater noise sources in shallow waters
Authors:   Институт общей физики им. А.М. Прохорова РАН, Кузькин Венедикт М. , Пересёлков Сергей А. ,   Воронежский государственный университет, Грачев Владимир И. ,   Институт радиотехники и электроники им. В.А. Котельникова РАН, Рыбянец Павел В. ,   Воронежский государственный университет, Ткаченко Сергей А. ,   Воронежский государственный университет
Published: August 2024

Представлен адаптивный помехоустойчивый алгоритм голографической обработки гидроакустических сигналов, обеспечивающий восстановление удаления и радиальной скорости подводных шумовых источников в мелководных акваториях при отсутствии информации о характеристиках среды распространения. Алгоритм строится на основе измеряемых величин голограммы источника. Приведены результаты численного моделирования. Выполнен анализ устойчивости алгоритма оценивания параметров источника по отношению к интенсивным внутренним волнам, обусловливающих горизонтальную рефракцию мод звукового поля.
Holographic method for processing hydroacoustic signals from a high-frequency source in shallow water
Authors:   Институт общей физики им. А.М. Прохорова РАН, Кузькин Венедикт М. , Пересёлков Сергей А. ,   Воронежский государственный университет, Грачев Владимир И. ,   Институт радиотехники и электроники им. В.А. Котельникова РАН, Логачев Владимир В. ,   Воронежский государственный университет, Косенко Иван М. ,   Воронежский государственный университет
Published: August 2024

Изложен метод голографической обработки высокочастотных гидроакустических сигналов с применением векторно-скалярного приемника в мелководной акватории. Представлены результаты теоретического анализа и численного моделирования. Выполнен анализ интерферограмм и голограмм для различных компонент колебательной скорости и звукового давления. Показано, что голографическая обработка шумовых сигналов с применением векторно-скалярного приемника позволяет обнаруживать источник, оценивать пеленг. Представлены результаты верификации метода в рамках численного эксперимента.
A New Record for The Flora of Türkiye: Cousinia mazu-shirinensis Rech.f.
Authors: Fidan Mehmet , Pınar Süleyman Mesut , Eroğlu Hüseyin , Armağan Metin
Published: August 2024

Cousinia mazu-shirinensis taxon was recorded for the first time in the Flora of Türkiye from Şırnak province, located in the southeast of Türkiye. The morphological characteristics of the C. mazu-shirinensis, the map of the distribution area, and the photographs of its natural habitat are also presented in the study.
Assessment of Key Factors Affecting Farmers' Migration Intentions Due to the Syrian Conflict
Authors: Gannum Kuteybe , Akbay Cuma , Kaynakçı Baydar Cevahir
Published: August 2024

This study aims to identify the migration patterns of Syrian farmers in northern Aleppo and to investigate the main factors affecting their migration patterns. In this context, the study data were obtained through face-to-face surveys with a total of 210 farmers from 17 villages in three administrative districts of Aleppo Governorate using a proportional sampling method. The data were analyzed using descriptive statistics and a logistic regression model. According to the results of the study, education level, land size, and household income were found to decrease the tendency to migrate. On the other hand, the factors that increase the tendency of farmers to migrate include being temporarily settled in the region and having family members abroad as refugees. As the war-induced environment has reduced participation in non-agricultural work, more farmers consider agriculture as their main source of livelihood.
Supply Chain Optimization: Machine Learning Applications in Inventory Management for E-Commerce
Authors: Tuli Ferdouse Ara , Mohammed Manzoor Anwar , Sachani Dipakkumar Kanubhai
Published: August 2024

This study delves into the potential impact of machine learning (ML) on supply chain optimization and inventory management for e-commerce. Our primary focus is analyzing the accuracy of demand forecasting, optimizing inventory levels, and evaluating the impact of real-time decision-making on supply chain efficiency. Using a secondary data-based review methodology, this study explores the implementation of advanced predictive analytics, real-time data processing, autonomous operations, and personalized customer experiences in prominent e-commerce companies like Amazon, Walmart, and Alibaba. Our findings show impressive advancements in demand forecasting accuracy, dynamic inventory management, and operational responsiveness. These improvements have led to cost savings and increased customer satisfaction. Nevertheless, some drawbacks exist, such as the significant expenses associated with implementation, concerns about data privacy, and the potential for overfitting the model. Policy implications call for solid data protection regulations, financial assistance for smaller businesses, and ethical guidelines for AI to promote fair and responsible machine learning applications. By tackling these obstacles, companies can maximize the potential of ML technologies to enhance efficiency, promote sustainability, and gain a competitive edge in the ever-changing world of e-commerce.
A Saúde Coletiva na Amazônia: redes de pesquisa, formação e situações de saúde e condições de vida
Authors: Schweickardt Júlio Cesar , Ferla Alcindo Antônio , Giatti Leandro
Published: August 2024

O livro faz parte do projeto Programa Nacional de Cooperação Acadêmica na Amazônia (PROCAD Amazônia/CAPES) que envolve três instituições: Programa de Pós-Graduação em Condições de Vida e Situações de Saúde na Amazônia (PPGVIDA) do Instituto Leônidas e Maria Deane/Fiocruz; Programa de Pós-Graduação em Saúde Coletiva da Faculdade de Ciências da Saúde da Universidade de Brasília (UnB); Programa de Pós-Graduação em Saúde Pública da Universidade de São Paulo (FSP USP). A coletânea traz contribuições de docentes e discentes que atuam na Amazônia, mostrando a potencialidade dos territórios e as estratégias de tecnologias de cuidado dos povos originários. A obra também traz resultados de pesquisa dos principais agravos da região, trazendo reflexões para o aprimoramento das políticas públicas. Por fim, a obra contribui para a ampliação da produção do conhecimento na saúde coletiva na Amazônia, mostrando que as parcerias institucionais e de grupos de pesquisa potencializam a ciência e as redes de atenção na região.