bluuebunny/crossref_metadata_2025 huggingface dataset:
Modeling of the Atmospheric Electric Field Daily Variation in the Turbulent Surface Layer
Authors: Timoshenko Dmitry V.
Published: October 2024

An electrodynamic model of the electric field dynamics behavior in the atmospheric surface layer due to the action of local factors is presented. The model was obtained by reducing the differential equations system of the electrode effect to the so-called total current equation, which is a second-order equation of parabolic type, considered in a two-dimensional space-time region. The total current equation allows us to connect the set of main factors influencing on the atmospheric surface layer electric field state: conduction current, turbulent current and current arising as a result of convective processes in the atmosphere with the so-called total current in the nearground layer, reflecting changes in the ionospheric potential. The described method provides significant advantages in research, since within the framework of one model it allows the formulation of various problems of electrodynamics of the surface layer and a comparative analysis of the influence on the behavior of the electric field in the surface layer of both individual factors and their combinations. Based on meteorological data at the Peak Cheget mountain station in the Elbrus region, a daily variation in the values of the turbulent diffusion coefficient was constructed. The resulting analytical dependence was used to solve the equation for the total current in the surface layer, provided that it is constant at the upper boundary of the turbulent electrode layer. Solutions obtained by the Fourier method describe the daily variation of the electric field strength depending on the degree of turbulent mixing in the atmosphere. The appearance of a time shift in daily extrema, a change in their amplitude, and the appearance of additional extrema depending on the elec-tric field values have been established. All of these effects are comparable to the global unitary variation and increase with increasing electric field.
Methano- and Sulfidogenesis in the Lakes of the Abrau Peninsula (Krasnodar Territory)
Authors: Fedorov Yuri A. , Garkusha Dmitry N. , Dotsenko Irina V. , Popov Yuri V. , Dotsenko Nikolay V. , Mikhailenko Anna V.
Published: October 2024

The geographical position, tectonic and geological-hydrogeological structure of the basin of the Malyy Liman and Abrau lakes, their landscape features as natural monuments of regional importance located on the territory of the Abrau peninsula of the Krasnodar Territory are described. Using the example of the aquatic landscapes of the Malyy Liman and Abrau lakes and the river of the same name, water and bottom sediments were studied. Hydrochemical parameters, the content of methane and sulfide sulfur in bottom sediments and methane in water as components of aquatic landscapes were studied. The results of the determination of sulfides, as well as the characteristic odor and color of bottom sediments, indicate the presence of free H2S and hydrotroilite (FeS ∙ nH2O) in them. Electron microscopy revealed the presence of hollow spheres in the bottom sediments, which indicates their possible gas saturation. Microinclusions of biogenic pyrite (FeS2), which was formed on fragments of plant and organism residues, were found under an electron microscope. In aerobic-anaerobic conditions of the upper layer of bottom sediments of lakes, pyrite formation occurs both directly through a one-stage process of pyritization of reactive iron, but also through a multi-stage process of pyrite formation from iron monosulfide. It has been established that lakes are exposed to anthropogenic influences, which can increase many times during the holiday season. This leads to their eutrophication and increased meanogenesis, which in turn contributes to the activation of methane emissions into the atmosphere. Specific methane fluxes from the water surface of the Malyy Liman and Abrau lakes have been determined.
Hydrochemical and Algological Characteristics of the Ustuu-Senek Mineral Spring (Tuva Republic, Russia)
Authors: Naumenko Yury V. , Nazyn Chechekmaa D. , Kashkak Elena S. , Oorzhak Urana S.
Published: October 2024

The informatioon algae and the hydrochemical composition of the mineral spring of Ustuu-Senek, located in the Ulug-Khem district of the Republic of Tuva is provided for the first time. According to the classification of medicinal mineral waters for its temperature indicators, arzhaan (mineral spring) belongs to the cold group, and in terms of its general hardness, it belongs to waters of medium hardness.The waters of Senek Arzhaan have a chloride-sulfate calcium-sodium composition. In terms of organoleptic and physicochemical indicators, the studied waters correspond to drinking water quality standards. The identified species composition of algae of the mineral spring is represented by 69 species of algae from 4 divisions: Cyanoprokaryota - 8, Bacillariophyta - 47, Chlorophyta - 2 and Charophyta - 12. The basis of the taxonomic composition is diatoms and characeae (85.5% of the total number of species), including blue-green and green algae account for 14.5%. There were identified 6 dominants, among which the special attention is paid by Diatoma hiemale and Diatoma mesodon According to the ecological-geographical analysis, which was carried out, the algal flora is represented by benthic species with a predominance of indifferent forms in relation to the halicity and active reaction of the environment. In the watercourses studied, 52 species, indicators of water saprobity, were identified. The predominance of xeno-, oligobionts and betamezosaprobionts was revealed. In terms of georgraphy, cosmopolitan and boreal species dominated.
Climatic and Paleoclimatic Factors of Soil Formation in the Territory of the Crimean Peninsula
Authors: Ergina Elena I. , Artemova Ekaterina A.
Published: October 2024

The article provides data on the peculiarities of climate dynamics on the territory of the Crimean Peninsula during the Holocene. Taking into account paleoclimatic data is necessary to predict the direction of evolution of soils and soil cover of the peninsula. It is especially important to take into account the presence of relict properties of soils, taking into account the progressive anthropogenic interference in the processes of modern soil formation. Attention is focused on the need to take into account features unusual for zonal soils when developing Soil management strategies. After all, most often, for objective reasons, a changed or inherited trait disappears forever from the current natural environment and cannot be restored.
Performance Comparison of PID and LQR Control for DC Motor Speed Regulation
Authors: Bagua Hakim
Published: October 2024

The aim of this research paper is to provide a comprehensive performance comparison of proportional-integral-derivative (PID) and linear quadratic regulator (LQR) control methods for DC motor speed regulation. First, a mathematical description of a permanent magnet DC motor model is offered, followed by the control systems PID and LQR, and finally, findings and discussions of whether the use of both control strategies is advantageous for DC. The results demonstrate how well LQR performs under various operating situations when compared to PID control. Engineers and researchers looking to optimize control system design for DC motor speed regulation may benefit a lot from the results of this study.
Acute vestibular syndrome accompanying middle cerebral artery infarctions: a single-center study
Authors: Kuloğlu Pazarcı Nevin , Gürsoy Gizem , Çiftçi Necip Kürşad
Published: October 2024

Objectives: Acute vestibular syndrome (AVS) is a disease and disorder usually manifest with a single episode of sudden onset vestibular symptoms and signs, and may occur at any point along the vestibular pathway from the peripheral labyrinth to the vestibular cortex. This study presents the characteristics of the involved cortical area and clinical course in middle cerebral artery (MCA) territory infarction patients with central vestibular disorder.
Methods: Files of patients diagnosed with acute ischemic stroke in the MCA territory were reviewed retrospectively between December 2020 and March 2022. All the patients were categorized into two groups (with or without AVS) and analyzed for comorbidities as well as smoking and drinking habits, and their data pertaining to the neurological examination, bedside neuro-otological examination, and laboratory and computerized tomography angiography findings were collected.
Results: Seven hundred and sixty-eight patients with MCA territory infarction were included in the study. AVS incidence was calculated to be 13.3%. There was no statistically significant difference in the distribution of age and sex between patients with and without AVS. The involvement of the right side was significantly more prevalent in AVS patients. Distribution of patients with right-sided infarction: 11 with posterior superior temporal gyrus 17 with parieto-insular cortex, 16 with insular cortex and temporoparietal junction together, and 18 with more than one millimetric infarction in all three areas.
Conclusions: Patients with acute vestibular syndrome, may have infarctions in the anterior circulation and most of them had no pathological neuro-otologic test findings.
Serum oxidative markers and delta neutrophil index in hyperemesis gravidarum
Authors: Yılmaz Gamze , Oluklu Deniz , Şahin Dilek , Neşelioğlu Salim , Gök Gamze , Erel Özcan , Akkaya Hatice , Özgü Erdinç Ayşe Seval
Published: October 2024

Objectives: To evaluate the relationship between different serum oxidative markers and the delta neutrophil index and hyperemesis gravidarum.
Methods: One hundred pregnant women were enrolled in the study and divided into two groups. Group 1 included 50 women with hyperemesis gravidarum, while Group 2 (control group) included 50 pregnant women similar in age, gestational week, and body mass index. Serum oxidative markers and complete blood count inflammatory markers were compared.
Results: Native thiol and total thiol were significantly lower in the Group 1 when compared with the control group (P=0.029 for native thiol; P=0.035 for total thiol). Moreover, ischemia-modified albumin (IMA) and catalase values were significantly higher in the Group 1 than in the control group (P=0.023 for IMA; P=0.021 for catalase). Index1% shows the disulfide/native thiol percent ratio and means that the Group 1 oxidant load is increased but not statistically significant. Myeloperoxidase, ferroxidase, and the delta neutrophil index did not differ significantly between the two groups (P=0.591, P=0.793, and P=0.52; respectively).
Conclusions: According to our study, contrary to the literature, although there are differences in some values, when evaluated individually hyperemesis gravidarum does not impose an extra burden on maternal oxidant-antioxidant balance.
EFFECT OF PRESSURE ON THE METAL-INSULATOR TRANSITION IN YBa2Cu3O7-δ SINGLE CRYSTALS
Authors: Inozemtsev M. M. , Spivak V. A. , Yarchuk D. F. , Chepurin O. G. , Lukavenko R. A. , Vovk R. V.
Published: October 2024

In present work we have investigated the effect of high hydrostatic pressure on conductivity in the ab-plane of the oxygen underdoped HTSC YbaCuO single crystals. It is shown, that the decreasing of oxygen concentration in sumples of YBa2Cu3O7-δ leads to enhancement of the localization and realization in the system of the metal – insulator transition, which always precedes the superconducting transition. Increasing the preassure leads to a significant shift of the metal – insulator transition to low temperatures.
Кадровый дефицит, влияние низкого уровня безработицы на макроэкономические показатели (в печати)
Authors: Арефьев Денис , Жаворонок Анастасия
Published: October 2024

Последствия кадрового дефицита на экономику, включают рост заработных плат, улучшение производительности, контроль инфляции и развитие новых рынков. Анализируются как позитивные, так и негативные аспекты данного явления с учетом его воздействия на макроэкономическую стабильность и перспективы экономического роста.
Minería y dependencia: una visión bioarqueológica desde una hacienda mineral de la época virreinal (Perú, siglos XVI-XIX)
Authors: Tomasto-Cagigao Elsa
Published: October 2024

La dependencia asimétrica se entiende como un sistema de relaciones sociales coercitivas, en las que unos actores controlan las acciones o el acceso a recursos de otros, y donde se comparten concepciones émicas respecto al poder, la desigualdad, el trabajo, las experiencias y las emociones. La invasión europea de América en el siglo XVI estableció un sistema con estas características y uno de los espacios económicos donde estas relaciones se establecieron con fuerza fue el de la explotación de metales. En este artículo se presenta parte de los resultados de la investigación bioarqueológica de un conjunto de esqueletos de personas enterradas en una capilla ubicada en una hacienda mineral de la época virreinal. Se analizan los impactos en la salud a través de traumatismos, malformaciones e infecciones en personas de distinto sexo y ascendencia. Los resultados muestran una correlación entre la posición en el sistema de dependencia asimétrica y los tipos de fracturas, pero no así en las malformaciones e infecciones.
Trap y funk brasileño
Authors: Wortman Ana
Published: October 2024

El propósito de este artículo consiste en analizar la emergencia de una nueva cultura juvenil global a través de la expansión del género trap, su expresión local en Argentina en comparación con el trap funk brasileño en Brasil. ¿Qué nos dice de nuestras sociedades esta representación musical visual de un estilo de vida de lo juvenil marginal? Como se puede advertir en portales de internet, redes sociales y plataformas de streaming, sus figuras tienen un alcance internacional al cual acceden en forma vertiginosa con el hábil uso de las tecnologías digitales. Las audiencias del trap y del funk dan cuenta de un fenómeno masivo, según destacan las visualizaciones de los perfiles de sus seguidores, siendo las redes sociales vía el celular de las/los cantantes de trap y funk más populares un modo relevante en la constitución del fenómeno a nivel social, comunicacional y visual.
Spinocerebellar Ataxia Type 27B (SCA27B): A Hereditary Ataxia in Portugal
Authors: Mendes Ferreira Vítor , Magriço Marta , Meira Bruna , Barbosa Raquel
Published: October 2024

Spinocerebellar ataxia type 27B (SCA27B) is a recently discovered hereditary disease caused by (GAA)≥250 repeat expansion in the fibroblast growth factor 14 (FGF14) gene, and multiple studies have recognized it as one of the most common causes of autosomal dominant ataxia in the European population. We present the case of a 62-year-old Portuguese patient who developed a slowly progressive gait impairment associated with wide-base ataxic gait, dysarthria, left upper limb dysmetria, and dysdiadochokinesia. This pure cerebellar phenotype had an episodic worsening induced by intense physical activity and alcohol intake. The patient had an older brother with a late-onset cerebellar ataxia of unknown cause. Genetic testing detected a heterozygotic intronic FGF14 repeat expansion with complete penetrance (> 360 repeats), confirming the diagnosis of SCA27B. To our knowledge, we present the first reported case of SCA27B in the Portuguese population.
A educação especial no financiamento da educação básica
Authors: Barbosa Adriana , Sobrinho Reginaldo Célio
Published: October 2024

Este artigo analisa a política orçamentária na educação básica destinada à garantia do direito à educação para o público-alvo da educação especial. Trata-se de uma pesquisa comparativa de dois contextos latinos: México e Brasil. Por meio da análise documental sistematizou-se dados relativos ao arcabouço jurídico normativo educacional desses países relacionados ao financiamento da educação básica. Os resultados mostram diferenças nos mecanismos de vinculação de recursos para a educação e nos repasses de verbas entre os entes federados. No entanto, as duas realidades compartilham a política de fundos e estabelecem metas de financiamento, que não são cumpridas. Além disso, não é claro o montante de recursos destinados ao apoio complementar/suplementar, da Educação Especial, para assegurar a qualidade educacional.
40 anos da Sociedade Brasileira de Educação Comparada
Authors: Aguilar Luis Enrique , Trigo Maiza de Albuquerque , França Eliacir Neves , Lima Juliana Ribeiro de , Antunes Evelise Dias
Published: October 2024

Elementos para o desenho de Política Editorial do Dossiê 40 anos da Sociedade Brasileira de Educação Comparada.
Comparative education and its neighbours
Authors: Bray Mark
Published: October 2024

As part of the celebration of the 40th anniversary of the Brazilian Society of Comparative Education, the Brazilian Journal of Comparative Education presents a contribution from Mark Bray, University of Hong Kong.
O pensamento histórico de estudantes do ensino médio a partir da interpretação de fontes
Authors: Santana Mateus Freire de , Reis Aaron Sena Cerqueira
Published: October 2024

Neste artigo, analisamos o pensamento histórico de estudantes do ensino médio a partir da interpretação de fontes documentais que evidenciam a escravidão brasileira no século XIX. A pesquisa foi realizada em uma escola pública federal da cidade de São Cristóvão, em Sergipe, e contou com a participação de 48 jovens com idades entre 16 e 19 anos. Os dados foram coletados a partir de um instrumento composto por questões abertas que, dividido em três etapas, estimulavam a identificação dos elementos técnicos da fonte (data, local de emissão e autoria), os agentes envolvidos, além de incentivar uma reflexão acerca do conceito de escravidão. Considerando os pressupostos da Educação Histórica, observamos que, embora os estudantes consigam perceber o conceito substantivo que lhes é apresentado, demonstram dificuldade para o desenvolvimento dos conceitos de segunda ordem, tais como a comparação entre fontes e, principalmente, a interpretação histórica.
Unveiling Patience: The Intersection of the Qur'an and Hadith in Buya Hamka’s Thought
Authors: Langaji Abbas , Karim Abdul Rahim , Ilham M. , Syatar Abdul , Karim Abdul Rahim , Rusdiansyah Rusdiansyah
Published: October 2024

This article examines the concept of patience in the thought of Buya Hamka, focusing on the integration between the Qur’an and hadith in Tafsir Al-Azhar. As a central theme in Islam, patience is not only understood as a passive reaction to adversity but as an active attitude reflecting spiritual strength and depth of faith. This article identifies how Buya Hamka interprets patience through the bi al-ma’thūr method, using hadith as an explanatory tool to deepen the meaning of patience-related verses. With a qualitative analysis that emphasizes textual study, this article presents evidence that Buya Hamka relates patience to social and individual contexts and creates practical guidance for Muslims in facing the challenges of daily life. Through this approach, the author shows how patience can serve as a tool to achieve emotional balance and mental resilience. The contribution of this study lies in the emphasis on the relevance of Hamka’s tafsir in the modern context, as well as the functionalization of hadith in expressing the profound values of patience. By filling an existing academic gap, this research offers new insights into the relationship between historical Islamic texts and contemporary spiritual practices, making Tafsir Al-Azhar an essential resource in guiding Muslims to understand and apply patience in their lives.
Spiritual Support In Chronic Renal Failure Patients With Hemodialysis : A Systematic Literature Review
Authors: Maisyaroh Arista , Widianto Eko Prasetya , Kurnianto Syaifuddin , Rizky Hilmi Miftahur
Published: October 2024

Introduction: Chronic renal failure (CRF) is a terminal condition. For decades, hemodialysis has become a chosen treatment for CRF patients to keep alive. Nevertheless. anxiety associated with the disease remains a major concern among this particular population. Therefore, spiritual therapy is given reduce the level of anxiety. This literature review aims to explore the benefits of spiritual therapies: reading and listening to prayers, supportive education, and counseling.
Methods: In this study the authors used the Literature Review method. Data collection methods with electronic databases are carried out through Spinger Link, PubMed, and ProQuest. Data were obtained from January 2022 to May 2022, included articles were full-text primary research, focused on spirituality support in CRF patients with Hemodialysis, within the publication period of 2017-2024. Exclusion criteria details are available in the full manuscript. To address the potential limitations introduced by language bias, only English and Indonesian-language publications were included. Instruments to assess the success of spiritual support in chronic renal failure patients with hemodialysis consist of the Daily Spiritual Experiences Questionnaire (DSES), HADS, CES-D: Epidemiologist Study Center Depression Scale, SWBS (Spirituality Well Being Scale) DUREL, Interview, RSC-brief, Questionnaire and Physical Symptom Distress Scale, PSQI Chinese version, Geriatric Depression Scale and Spiritual Well-Being Scale.
Results: Ten (n= 10) articles were retrieved. Those described the benefits of spiritual therapies: reading and listening to prayers, supportive education and counseling. The level of anxiety among hemodialysis patients decrease after the treatments were given. The single and whole treatment can be applied daily, and no negatives of treatments were reported.
Conclusions: Spiritual support positively reduce anxiety in patients with CRF with hemodialysis. Nurse is highly recommended to include spiritual education, counseling, listening to prayers, and reading prayers in anxiety associated with hemodialysis management in to nursing care plan.  Further research examining the effect of spiritual treatment for patients in their early living with hemodialysis and those with long life span is necessary.
Transplante autólogo de células tronco hematopoiéticas em pacientes com tumor de células germinativas refratário: a experiência inicial do Hospital Universitário Walter Cantídio
Authors: Silva Daniel Facundo da , Duarte Fernando Barroso , Barroso Karine Sampaio Nunes , Leitão João Paulo de Vasconcelos , Araujo Beatriz Stela Gomes de Souza Pitombeira , Freire Natália Costa Bezerra
Published: October 2024

Introdução: O uso do transplante autólogo de células tronco hematopoiéticas (aTCTH) como tratamento para tumores de órgãos sólidos, ainda que restrito a um grupo pequeno de neoplasias, avançou nos últimos anos, principalmente nos tumores de células germinativas refratários/recidivados (TCG-RR). O serviço de Transplante de Medula Óssea (TMO) do Hospital Universitário Walter Cantídio (HUWC) oferece essa terapia para pacientes do nordeste brasileiro, através do serviço público, embora enfrente desafios relacionados à aquisição de medicações e demografia local. Objetivos: Descrever as características e desfechos de uma série de casos de pacientes com TCG-RR tratados com aTCTH no HUWC. Metodologia: Foi realizada uma análise retrospectiva dos dados de prontuários de pacientes registrados como tratamento de tumores germinativos no serviço de TMO. Resultados: foram encontrados nove pacientes que realizaram aTCTH entre 2010 e 2020, entretanto apenas três destes realizaram o segundo transplante em tandem preconizado. O uso de vinorelbine na mobilização de células tronco foi verificado em cinco pacientes. Discussão: A realização de transplante autólogo em pacientes com TCG-RR demonstra seu potencial curativo, mas dificuldades possivelmente relacionadas à obtenção de medicações e comorbidades relacionadas a tratamentos prévios reduzem a sobrevida ao tratamento.
Onion-skin type of periductular sclerosis in mice with genetic deletion of biliary kindlin-2 as tight junction stabilizer: a pilot experiment indicating a primary sclerosing cholangitis (PSC) phenotype
Authors: Lukasova Martina , Weinberger Katharina , Weiskirchen Ralf , Stremmel Wolfgang
Published: October 2024

Aim: Primary sclerosing cholangitis (PSC) and ulcerative colitis are often associated. In ulcerative colitis, a tight junction defect can be detected, resulting in impaired secretion of hydrophobic phosphatidylcholine to the intestinal mucus. This defect causes a vulnerable mucus shield, allowing the microbiota to attack and leading to mucosal inflammation. A similar pathomechanism may be present in PSC.

Methods: To study biliary deletion of tight junctions, mice carrying a Cre/loxP system sensitive to tamoxifen were used to delete kindlin-2, a tight junction adapter protein. The Cre-preceded promoter was derived from hepatocyte nuclear factor-1β (Hnf1β), which is specific for biliary and pancreatic epithelium operative in embryonic life until adolescence. Cre-negative kindlin-2flox/flox mice treated with tamoxifen served as controls.

Results: After tamoxifen induction, alterations in the biliary epithelium were detectable. As a hallmark feature of PSC, an onion-skin type of fibrosis around the bile ducts was present. However, levels of alkaline phosphatase, bilirubin, aspartate aminotransferase, alanine aminotransferase, and lactate dehydrogenase in the serum were not yet elevated in these young mice.

Conclusion: Genetic deletion of cholangiocyte kindlin-2 impairs tight junctions, revealing a PSC-like phenotype. This supports the hypothesis that an impaired phosphatidylcholine content of biliary mucus allows luminal bile acids to attack the biliary epithelium, leading to cholangitis.
Optimisation of SPME Arrow GC/MS method for determination of wine volatile organic compounds
Authors: Tomaz Ivana , Šikuten Iva , Tuščić Valentina , Rendulić Nera , Preiner Darko , Buljević Nina , Jagatić Korenika Ana-Marija , Jeromel Ana
Published: October 2024

A new technology called solid phase microextraction (SPME) Arrow has recently been used in the analysis of food volatile organic compounds (VOCs). This technology is still not widely used for the analysis of wine VOCs, which play a crucial role in sensory properties. For optimisation of SPME Arrow extraction conditions, Box–Behnken experimental design and response surface methodology were used. The optimised conditions were extraction temperature, incubation time, and exposure time. The most significant factors affecting extraction efficiency were extraction temperature and exposure time. An increase in temperature and exposure time increased the analytical signal of most classes of VOCs extracted from both white and red wine samples. For VOCs in white wines, the optimal conditions are an extraction temperature of 50 °C, an incubation time of 10 min, and an exposure time of 60 min, while for VOCs in red wines, the optimal conditions are an extraction temperature of 60 °C, an incubation time of 17 min, exposure time of 53 min. The new optimised method allows more accurate and time-saving analysis of VOCs from wines, enabling the analysis of a large number of samples.
Contribution de la télédétection pour caractériser les zones irriguées et les prélèvements d'eau pour l'irrigation
Authors: COURAULT Dominique , BELAUD Gilles , DEMAREZ Valérie , BAGHDADI Nicolas , BAILLY Jean-Stéphane
Published: October 2024

La télédétection, en offrant une couverture spatiale et temporelle étendue, permet une meilleure compréhension des besoins en eau des cultures. Actuellement, diverses variables liées à l'eau sont en libre accès, permettant de suivre les types de cultures, l'humidité des sols, et la dynamique des couverts végétaux. Cependant, les cartes annuelles des zones irriguées manquent encore, bien que des méthodes prometteuses soient en développement. Les estimations des dates d'irrigation et des volumes d'eau apportés restent également en phase de recherche. Les sections développées dans cet article décrivent des avancées sur ces points. Les images satellitaires, comme celles délivrées sur la plateforme THEIA, fournissent des mises à jour régulières des cartes des cultures, identifiant 24 classes en France et outre-mer. D'ici 2026, des projets visent à améliorer la fréquence et la précision de ces cartes. Pour les surfaces irriguées, l'utilisation d'indices de végétation et de données radar permet de distinguer les cultures irriguées des non-irriguées, avec une précision variable. Enfin, des approches combinant télédétection et modèles agro-hydrologiques montrent un potentiel significatif pour la gestion de l'eau agricole, malgré des défis persistants.
Gestion des déchets solides ménagers au Cameroun : limiter les décharges anarchiques à Yaoundé par le tri à la source et la pré-collecte porte-à-porte
Authors: MONEBENE Fulbert Francky
Published: October 2024

Le Cameroun compte plus de 400 structures agréées pour le traitement des déchets solides, qui parcourent quotidiennement les décharges des milieux urbains, à la recherche des déchets valorisables. Malgré ce nombre important d’acteurs, les décharges sauvages des ordures dans les métropoles camerounaises ne cessent de se créer et de s’agrandir. L’enquête menée auprès des ménages et des sociétés de traitement des déchets en vue de comprendre l’origine de ce phénomène dans la ville de Yaoundé révèle que la multiplication des décharges anarchiques est due principalement aux défaillances dans le système de pré-collecte, mais surtout au fait que les ordures y sont acheminées étant mélangées, ce qui entraine la contamination des déchets recyclables par les matières organiques en décomposition. La contamination des déchets recyclables diminue leur valeur et décourage les structures de traitement de ces déchets, qui se contentent de collecter seulement une partie négligeable des matériaux qui les intéressent. Ainsi, les ordures vont demeurer plus longtemps dans les décharges et vont s’accumuler avec le temps. Un système de tri des déchets à la source et de pré-collecte porte-à-porte permet de préserver les déchets recyclables de la contamination, et d’éradiquer les décharges anarchiques des ordures dans les milieux urbains camerounais.
Algorithms and software for processing images of the structure of metallic materials for the purpose of determining creep characteristics
Authors: Breslavsky Dmytro , Hroshevyi Mykhailo , Tatarinova Oksana , Senki Olena
Published: October 2024

The paper contains a description of the approach, algorithms, and software tool for image analysis of deformed material structures. The developed approach is based on the analysis of the microstructure of the material to identify important factors that affect high-temperature deformation during creep in a heat-resistant nickel-based alloy, namely, the dimensions of the channels and their orientation. The developed software tool uses algorithms for converting images into binary black and white using the Otsu method. The intensity of the gradient at each point of the image is visualized using the Sobel operator. Fragment boundaries are determined using the Canny edge detector. Straight line segments are found using the Hough transformation. The software tool is implemented in the Python programming language using the OpenCV library. The main components are described and a flow chart of the program is provided. With the use of the developed software, the transformation of the known experimentally obtained images of the structures of the specimens from heat-resistant nickel-based alloy CMSX-4 deformed at a temperature of 1273K and in a  wide range of stresses at different time moments was performed. The results of the analysis of the dimensions of the g-phase channels in the alloy using quantitative evaluation of transformed binary images are discussed. The found characteristics were matched to the value of the creep strain rate, which was determined by calculation based on known experimental data. The possibility of determining the transition from the secondary creep to the stage of avalanche-like growth of strains and hidden damage is shown. For the considered example, the location of the channels in the representative image was determined. A technique for correcting creep curves with the involvement of material structure image processing data is proposed.
Analisis risiko produksi ribbed smoked sheet (RSS) di PTPN IX Kebun Balong, Jepara
Authors: Budiyono Rena Mardiyah , Roessali Wiludjeng , Prastiwi Wahyu Dyah
Published: October 2024

Indonesian rubber plantations have the largest area in the world at 3,776.49 thousand hectares, yet they cannot be the largest producer of natural rubber. PTPN IX Balong is a state-owned company that processes latex into RSS. The production often experiences fluctuations which indicate the production risks faced by the company. The study aimed  to examine the agents of production risk that are considered priorities, as well as effective mitigation strategies to reduce the impact of production risk. The research was conducted from November to December 2022 at PTPN IX Balong, Bumiharjo Village, Keling District, Jepara Regency. The research was a case study method with primary data collected by observation and distributing questionnaires to specific key persons. The secondary data were obtained from RSS production records. Data were analyzed using a quantitative method, namely House of Risk (HOR), to answer research purposes. The results showed that there are 8 priority risk agents that will be mitigated, namely high rainfall, long-tapping and picking-up times, errors made by the officers of the smoke room, broken grinding machine, dirty post-harvest tools, improper latex dilution, an excess dosage of antacid, and late application of ammonia. The mitigation strategy used to minimize the priority risk agent (source) consists of 7 risk mitigation strategies. Tightening inspections at the factory is the top priority to be implemented.
Persentase penambahan bagian telur ayam pada proses pengolahan amplang ikan lele dumbo (Clarias gariepinus)
Authors: Fauzi Mukhammad , Witono Yuli , Alfisyahrica Alfisyahrica , Astriani Astriani
Published: October 2024

Amplang is a traditional food/cracker of East Kalimantan that is made by mixing mackerel, tapioca flour, eggs, and some seasonings. Innovation is needed to improve the local product of african catfish (Clarias gariepinus). The portion of egg has a different functions in the dough of amplang. This study aimed to determine the effect of the portion and percentage of eggs on the chemical, physical, and organoleptic characteristics of amplang made from catfish (Clarias gariepinus). The study used randomized group design (RGD) in factorial with two factors. The first factor (A) was the eggs that were added consisted of egg white, yolk, and mixed egg white and yolk (1:1). The second factor (B) was the percentage of eggs that were added to the weight of african catfish (20%, 30%, 40%). The result showed that the best characteristics of amplang were amplang A1B3 (40% of white egg): water content was 2.59% (bb); fat content was 20.39% (bb); protein content was 9.11% (bk); brightness value was 64.95; texture value was 526 gf/mm 2; blooming capacity was 440%; hygroscopicity was 1.22%; oil absorption 18.85%; color sensory value was 4.6 (like to very like); taste sensory value was 3.88 (rather like to like); crispness sensory value was 4.24 (like to very like); the overall sensory value was 4.32 (the favorable to the most favorable).
Improving the Efficiency of Submersible Multistage Pumps Based on the Hydrophobization of the Flow Part Surfaces
Authors: Kromm G. A. , Drobnitsky N. A. , Volkov A. V. , Druzhinin A. A. , Lyapin V. Y. , Trulev A. V. , Kachanov I. V. , Brovka G. M.
Published: October 2024

The paper presents an experimental study of an assembly of five stages of an electric centrifugal pump (ECP) installation, the flow part of which is modified according to the principles of biomimetics, namely using the “lotus leaf effect”. The object of the study was a 5A-35 ECP. The surfaces of the blade systems of impellers and guide devices of stages 5 A-35 were hydrophobized using the method of applying surfactant layers. The degree of impellers hydrophobicity was estimated by the wetting angle average value measured by three drops at three different points on the impeller surface. The impellers surface roughness under study was determined by the arithmetic mean profile deviation Ra and the profile height irregularities Rz. The issues related to the surfactant coating modification effect salt deposition and corrosion were studied. For this purpose, the surfaces of the original and modified impellers were subjected to intensive forced salt deposition as a result of prolonged exposure to saline solution. The conclusion about the samples corrosion resistance degree was made by changing their mass, which was due to the salt deposits formation during 15 hours of stay in solution, as well as using the drop method. Both methods have shown that the surfactant coating can serve as a salt deposition inhibitor, and the pump impeller modified by it has increased corrosion resistance. Thus, during comparative tests, a smaller mass of salt was deposited on the modified impeller sample during 15 hours of exposure in saturated saline solution than on the original sample. This indicates that the surfactant layer prevents the salt deposits fixation on the working surfaces of the pump stage. On the modified sample examined by the drop method, the indicator color changed in 20 minutes, and on the original one – in 2 minutes. Experimental studies have been carried out, during which the operation energy parameters of a five stages 5A-35 pumping package with initial and modified surfactant-coated impellers have been determined. The studies have shown a 2 % increase in efficiency in the pum-ping package of stages with modified impellers. The results of the study can be useful in the oil production, chemical industry, as well as in the housing and communal services sector.
Features of Carbon Regulation in the Republic of Belarus and the Russian Federation: Comparative Analysis and Trends
Authors: Liubchyk V. A. , Pinaev V. E. , Ukhova V. N.
Published: October 2024

The article reviews international acts in the field of combating climate change (United Nations Framework Convention on Climate Change, Kyoto Protocol and Paris Agreement), identifies the main trends in the field of carbon regulation: emissions quoting; implementation of climate projects; introduction of greenhouse gas reporting and expansion of the legislative framework. A comparative analysis of the national legislation in force in the Republic of Belarus and the Russian Federation is carried out, its conditional classification is considered with the allocation of carbon regulation instruments being applied, viz. the market ones, the restrictive ones, the supporting ones and the auxiliary ones. The regulation of greenhouse gas emissions should include a wide range of activities and cannot be reduced solely to restrictive instruments. Market instruments include the national emissions trading system, international voluntary markets and instruments of international cooperation, while restrictive instruments include the introduction of carbon taxes, quotas, and mandatory carbon reporting. Among the examples of supporting instruments subsidies, targeted financing and tax preferences, as well as information policy may be noted. Auxiliary instruments include methodologies for quantitative assessment of greenhouse gas emissions and uptake, carbon reporting standards and tools for verification of reporting on greenhouse gas emissions, legislated possibility of implementing climate projects. The normative national regulation regarding the accounting of greenhouse gas emissions is considered, the categories of emission sources and greenhouse gases whose emissions are subject to accounting are identified. It is important to note that the legislation on greenhouse gases in the Republic of Belarus and the Russian Federation, as well as around the world, has not been finalized and is in the process of formation.
Change and Characterization Method of Formation Sand from Reservoir to Wellbore
Authors: Shanshan Liu
Published: October 2024

The factors affecting sand production in weakly consolidated reservoir include formation characteristics, well completion and production parameters, etc. The flow space of oil and sand includes porous media, sand control media and production wellbore, which is continuous in space (reservoir - bottom hole - wellbore). In view of the key problems of sand production management, the concept of integration in the sand control completion project is applied to carry out the research on the sand particle change law in the whole flow area from the reservoir to the wellbore. A fractal dimension of the formation sand particle size which reflects the distribution characteristics is proposed to depict the migration change law of the formation sand from the reservoir to the wellbore production system. CFD-DEM (Computational Fluid Dynamics - Discrete Element Method) simulation method is conducted to study the micro sand blocking process of slot screen and a prediction model for cumulative sand production quality and particle size distribution were established. This article studies the filtration of sand control media and the migration law of sand particles in the wellbore. Considering the influence of sand particle size distribution characteristics on solid-liquid two-phase flow, a horizontal wellbore sand concentration prediction model was established based on single factor analysis method and Buckingham's theorem. The influence of different flow conditions on the sand concentration in the wellbore section was revealed. The innovation of the paper is introducing the fractal dimension of sand particles into the establishment of quantitative sand production prediction models and wellbore sand concentration models.
Application of Vapor Acid Matrix Acidizing in Clastic Reservoir: Laboratory Test and Field Trial
Authors: Razali A. Mohammad , Berok S. M. James , Lee Q. Z. , Yeap W. J. , Ahmad N. A. , Ismail W. R. Wan , Sidek S. , Jeffry S. Mohd , Mohamad W. A. Wan , Madon B. , Dzulkarnain I.
Published: October 2024

A new method of acid matrix stimulation treatment was deployed in offshore Field S to remove formation damage in one of the gas producers. The new method involved deploying an inert stable solid chemical stick downhole via wireline. Once deployed downhole and activated to burn, heated vapor of Hydrochloric Acid (HCl) and mud acid is generated in sequence to react with the formation and the well is then ready for flowback after four hours of soaking. This new method has effectively simplified acid stimulation treatment operations by eliminating pumping operations using barge, which resulted in a more cost-effective solution.

The treatment consisted of HCl and mud acid only, which is an uncommon practice for a typical acid matrix treatment for clastic formation. Without additives, solid precipitations are a major concern as it can cause further damage to the near wellbore region. Hence, extensive laboratory analysis were conducted on the reservoir core samples to investigate the effect of 15% HCl and mud acid without any additives. The main objective was to determine the return permeability post acid treatment and subsequently evaluate potential solid precipitations. The laboratory analysis conducted were coreflood, dissolution and compatibility test.

Coreflood test results showed reduction in permeability post treatment by 25% due to solid precipitations which was further identified through mineralogy and Inductive Coupled Plasma (ICP) analysis after the acid treatment. The dissolution test showed 10% to 11% of overall sample weight loss. This paper describes the details of the laboratory analysis and findings from the job execution of pure acid stimulation treatment (without additives) for a clastic formation. Best practices and lessons learnt during job preparation and execution will be discussed to provide insights for future technology replications.
Underground Gas Storage Thermal Effects on Wellbore Integrity and Operation Safety – a Case Study from a Carbonate Reservoir in High Tectonic Stress Region
Authors: Yu Huijuan , Sinaki AmhadReza Younessi , Yang Ying , Wang Yan , Mao Chuanqin , Tang Zhiping , Li Liming , Salter Tim , Ma Xiyu
Published: October 2024

High injection and production rate is a typical feature of underground gas storage (UGS) wells at each seasonal circle, which cause temperature change due to Joule-Thomson effect. Through an UGS case study of Southwest China, this paper demonstrates that cooling effect augments pressure related in-situ stress changes, which has impact on wellbore and cap rock integrity and UGS operation safety.

Cooling effect was clearly observed in high-rate wells at the crest of the reservoir during injection and production cycles. Thermal analysis was carried out to investigate the risks associated to the UGS operation.

The results of analytical Energy Balance Equation (EBE) indicates that the 20°C-temperature drop can happen at the near wellbore 15-80m region, and the 10°C-temperature drop can happen at the near wellbore 30-150m region. Rreservoir thermal modelling which accounts for heat transfer between the reservoir and its overlying and underlying formations show a temperature reduction of 4 ~ 18 °C in vicinity of the well, with an impact radius of 15~150 m from the injection boreholes. This was more pronounced around the higher injection rate wells. From thermoelastic equations, these results are used to evaluate the range of stress reduction induced by thermal contraction of overlaying and underlaying rocks. Subsequently, the upper pressure limit for caprock integrity was modified.

It is not paid much attention to thermal/cooling effect in the many of UGS operations, and its impact on rock stress change by high-rate injection and production is ignored. This paper showed that the cooling effect shouldn't be ignored during UGS safety operation to ensure the wellbore integrity and formation sealing integrity. The methodology established in this case study can be referred by other UGS and gas storages projects.
Analysis of Technologies and Methods of Hydrogen Storage in Liquid Organic Hydrogen Carriers
Authors: Zhang Xi , Li Yiheng , Zhang Chenjun , Zhang Lin , Yu Huidi , Zhang Lanqiong , Liu Xiaodan , Miao Sheng , Wang Xiaoqi , Wang Shanyu , Jin Xu
Published: October 2024

For hydrogen storage and transportation, liquid organic hydrogen carriers (LOHCs) are got into focus within the latest years since their volumetric storage density and the similarity in their material properties to currently common fuels. This paper mainly evaluates four most promising LOHC systems. Then a detailed examination of the four systems is given, with particular focus on the hydrogenation and dehydrogenation reactions and the required catalysts. The main drawback of LOHCs systems and the potential for heat integration and efficiency improvements are presented at the last section.