bluuebunny/crossref_metadata_2025_split huggingface dataset:
CHOIR MUSIC BY CESAR CUI: THE SPECIFICS OF THE COMPOSER 'S CHORAL STYLE FORMATION
Authors: Калимова М.В. , Купец Л.А. 
Published: May 2024

В статье анализируется хоровое творчество Ц. А. Кюи с позиции влияния европейских и русских музыкантов на формирование авторского стиля. Отмечена специфика этнического происхождения композитора, детские и юношеские впечатления, окружение и знакомства Кюи в разные годы жизни. Среди них выделены влияние французской культуры и музыки Ф. Шопена, а также произведений М. Балакирева, А. Даргомыжского и А. Серова. На основе высказываний Кюи-критика и музыкального писателя акцентируются важные для него особенности вокальной музыки и его творческие и стилистические установки как хорового композитора.
The article analyzes the choir musical works of С. Сui from the point of view of the influence of European and Russian musicians on the formation of the author's style. The specifics of the composer 's ethnic origin, childhood and youth experience, environment and contacts of Cui in different years of life are noted. Among them are the influence of the French culture and music of Chopin, as well as the works of M. Balakirev, A. Dargomyzhsky and A. Serov. Based on the remarks of Cui-critic and music writer, features of vocal music, important for him, and his creative and stylistic settings as a choir composer are emphasized.
Deteksi Objek Bahasa Isyarat Alfabet BISINDO Menggunakan Deep Learning dan Arsitektur YOLO
Authors: Afandi Mas Aly , Kinanti Alicia , Permatasari Indah , Tarigan Nicolas Yonara 
Published: May 2024

Komunikasi merupakan kegiatan kemasyarakatan yang dimana dilakukan dua atau lebih orang untuk dapat saling bertukar informasi. Komunikasi dapat dilakukan dimana saja dan kapan saja. Namun komunikasi secara normal tidak dapat dilakukan oleh kalangan berkebutuhan khusus terutama tuna wicara. Permasalahan tersebut menimbulkan banyak kerugian bagi penyandang tunawicara untuk berkomunikasi dengan kaum dengar. Kondisi tersebut dapat dihindari dengan membuat sistem pendeteksian bahasa isyarat alfabet BISINDO berbasis computer vision. Penelitian ini memanfaatkan kecerdasan buatan dalam mengenali bahasa isyarat, serta penggunaan konsep Deep Learning dan pemanfaatan arsitektur YOLOv4. Kecepatan dan keringanan komputasi juga menjadi pertimbangan penting dalam penelitian ini untuk mendapat hasil yang cukup baik dengan waktu komputasi secepat mungkin. Sistem dibangun menggunakan total 494 dataset citra yang sekaligus digunakan untuk pelatihan serta pengujian sistem. Untuk dapat mengukur besarnya performa dari model digunakanlah Confusion Matrix. Hasil dari pengujian menunjukkan bahwa sistem memiliki tingkat accuracy sebesar 99.7%, tingkat precision sebesar 96%, dan tingkat recall sebesar 96%. Penelitian ini membuktikan bahwa metode ini dapat digunakan untuk mendeteksi bahasa isyarat alfabet BISINDO dengan benar dan akurat berdasarkan masukan gambar.Komunikasi merupakan kegiatan kemasyarakatan yang dimana dilakukan dua atau lebih orang untuk dapat saling bertukar informasi. Komunikasi dapat dilakukan dimana saja dan kapan saja. Namun komunikasi secara normal tidak dapat dilakukan oleh kalangan berkebutuhan khusus terutama tuna wicara. Permasalahan tersebut menimbulkan banyak kerugian bagi penyandang tunawicara untuk berkomunikasi dengan kaum dengar. Kondisi tersebut dapat dihindari dengan membuat sistem pendeteksian bahasa isyarat alfabet BISINDO berbasis computer vision. Penelitian ini memanfaatkan kecerdasan buatan dalam mengenali bahasa isyarat, serta penggunaan konsep Deep Learning dan pemanfaatan arsitektur YOLOv4. Kecepatan dan keringanan komputasi juga menjadi pertimbangan penting dalam penelitian ini untuk mendapat hasil yang cukup baik dengan waktu komputasi secepat mungkin. Sistem dibangun menggunakan total 494 dataset citra yang sekaligus digunakan untuk pelatihan serta pengujian sistem. Untuk dapat mengukur besarnya performa dari model digunakanlah Confusion Matrix. Hasil dari pengujian menunjukkan bahwa sistem memiliki tingkat accuracy sebesar 99.7%, tingkat precision sebesar 96%, dan tingkat recall sebesar 96%. Penelitian ini membuktikan bahwa metode ini dapat digunakan untuk mendeteksi bahasa isyarat alfabet BISINDO dengan benar dan akurat berdasarkan masukan gambar.
USING LWD OPERATIONS TO DEFINE GAS SATURATION OF TERRIGENOUS RESERVOIRS
Authors: ВЕРЕЩАГИН А.М. , ЯДРЫШНИКОВА И.А. 
Published: May 2024

В статье дана оценка методики газонасыщенности коллекторов непосредственно на этапе строительства скважин. Оценка газонасыщенности коллекторов классически производится путем сопоставления фонового замера нейтрон-нейтронного каротажа по тепловым нейтронам, выполненного сразу после обсадки скважины эксплуатационной колонной в условиях сформированной зоны проникновения фильтрата бурового раствора, с замером, произведенным спустя время, достаточное для расформирования зоны проникновения. Недостатком такого способа является то, что зона проникновения может расформировываться в течение длительного времени (до полугода и дольше), что, в свою очередь, может быть неприемлемо по срокам принятия решений о разработке объекта. При каротаже в процессе бурения создаются уникальные условия измерения с незначительным влиянием ЗПФБР на результаты исследований радиоактивными методами. Что открывает возможность количественной оценки газонасыщенности коллекторов непосредственно на этапе строительства скважин.
This article is devoted to an assessment of a gas saturation methodology during construction of wells. The classic approach to assessing a gas saturation of reservoirs relies on comparison between the baseline measurement of a thermal neutron-neutron logging carried out just after casing a well with a production casing under conditions of a formed zone of penetration of drilling fluid filtrate and the measurement made after sufficient time to disband the penetration zone. The disadvantage of this method is that the penetration zone can be disbanded over a long period of time (up to six months or longer), which in turn can be unacceptable on the timing of decision-making about the well drilling. Logging while drilling creates the unique measurement conditions with insignificant influence of a formed penetration zone on the results of the radioactive research that provides the opportunity to a quantitative assessment of the gas saturation of reservoirs directly during at the drilling of a well.
APPLICATION OF VISCOELASTIC SYSTEMS FOR HYDRAULIC FRACTURING IN HORIZONTAL WELLS
Authors: АБУСАЛ Ю. , ЯХИН А.Р. , ГАЛИМЗЯНОВА Л.Р. 
Published: May 2024

Современные тенденции по интенсификации добычи углеводородов в осложненных условиях сводятся к применению технологии гидроразрыва пласта (ГРП). Как показывает опыт использования данной технологии, традиционные жидкости ГРП не столь эффективны, поэтому зарубежными исследователями рассматривается возможность применения новых видов жидкостей. В статье приводится описание и сравнение результатов лабораторных исследований жидкостей с добавлением полиакриламида, выполненных российскими и зарубежными исследователями. В ходе литературного обзора по данной тематике выяснилось, что реологические показатели являются одним из главных параметров, благодаря которому данные жидкостные системы можно рассматривать в качестве конкурирующих наравне с традиционными жидкостями при применении данной технологии. Рассматривается влияние таких реологических свойств как вязкость и упругость, на несущую способность пропанта, скорость его оседания с выбором при этом оптимального количества химического вещества.
Current trends in intensifying hydrocarbon production in difficult conditions come down to the use of hydraulic fracturing (HF) technology. As experience in using this technology shows, traditional hydraulic fracturing fluids are not so effective, so foreign researchers are considering the possibility of using new types of fluids. The article describes and compares the results of laboratory studies of liquids with the addition of polyacrylamide, performed by Russian and foreign researchers. During a literature review on this topic, it turned out that rheological indicators are one of the main parameters due to which these liquid systems can be considered as competing on a par with traditional liquids when using this technology. The influence of such rheological properties as viscosity and elasticity on the bearing capacity of the proppant and its settling rate with the selection of the optimal amount of the chemical substance is considered.
Allah Tritunggal dan Nilai Rumah Adat bagi Hidup Menggereja. Studi Kasus di Paroki Maria Diangkat ke Surga, Rejeng, Manggarai, Keuskupan Ruteng
Authors: Jegaut Siprianus 
Published: May 2024

The focus in this study is “Triune God and the Value of Traditional House for Church Life in Manggarai.” It is a case study in the parish dedicated to the the Assumption of the Blessed Virgin Mary into Heaven, Rejeng, Ruteng Diocese.” The Church believes that God has already worked with in every culture wherever the Gospel is proclaimed. Proclamation of the gospel aims to contextualize it into the culture, in such a way that the gospel can truly be accepted in any culture. The Christian congregations do not only accept it but also live it out with in their culture. Their lives are truly imbued by the spirit of the gospel. This study aims to investigate how the faith of the people takes root in their culture. The method used in this study is a qualitative one with two approaches, namely literature review and interviews. This study finds out three main points: the communion with God; the traditional house as the place to share love; and the celebration of faith in community.
Future of District Heating Systems – Investigation of Various Technologies in Danish Context
Authors: Murkowska Marta Irena , Andersen Anders N. 
Published: May 2024

In response to the urgent need for decarbonization, district heating (DH) systems must explore emission-reducing investments that simultaneously lower operational costs of the plant. The recent years with wildly fluctuating gas and electricity prices put even more emphasis on finding the optimal combination of generation units for DH systems. This article aims at investigating which of the available technologies are the future of district heating. Solar collectors, photovoltaics (PV) and wind turbines and their combinations with other technologies are considered. The analysis is done based on Assens District Heating located in Funen, Denmark, where the annual heat production is approximately 96 000 MWh. The plant has already invested in an East-West oriented PV plant and a heat pump. However, for the purpose of this paper, an assumption is made that this investment can be redone based on the present investment costs in Denmark. The analysis is made in the energy system analysis tool energyPRO, where different combinations of technologies are analyzed. The study investigates the operational and investments costs, looking into the influence on Net Heat Production Cost (NHPC) and quantifying the investment yearly benefit. The results demonstrate profitability and feasibility of integrating renewable energy resources into district heating systems within the Danish context. The ambition is to showcase the possibilities and provide decision makers with insight into robust investments in renewable energy systems. Furthermore, by highlighting the success and potential of renewable energy integration in district heating systems in Denmark, this study aims to inspire further research and innovation in the field in other European countries, where the DH systems are primarily based on fossil fuels.
Use of an Absorption Heat Pump to Lift the District Cooling Waste Heat Temperature for the District Heating Supply in Tallinn: a Technical and Economic Analysis
Authors: Kirs Tanel , Latõšov Eduard , Volkova Anna 
Published: May 2024

Absorption heat pumps can lift a lower temperature waste heat source to a higher temperature useful output. In that process, it uses less electricity as an input compared to heat pumps with electrical compressors. Therefore, in some cases, it can be used to lift a lower temperature waste heat source to a higher temperature useful output with less electricity consumption. Absorption heat pumps are not very widely spread in district heating, mostly because there aren’t many suitable waste heat sources or conditions needed to run them. Tallinn has a district heating system with an annual generation of more than 2 TWh and a goal to make it an entirely carbon neutral district heating system by 2030. Tallinn has also started to develop a district cooling network, and by the end of 2023, the installed capacity was about 6 MW. District cooling capacity is estimated to grow to around 100 MW in 2030. This paper investigates different types of absorption heat pumps and the possibilities of integrating an absorption heat pump to a district cooling plant with the purpose of using waste heat from the cooling plant for renewable heat generation, that can be used in district heating. Different technical aspects are examined to find a suitable production solution, are presented as results. From an economical point of view, the cost of heat to cover peaks with an absorption heat pump is calculated. The effect of reducing fossil fuel use in the Tallinn district heating network with an absorption heat pump is estimated.
Proportioning of Oil Shale Ash for Sustainable 3D Printable Mortars
Authors: Sinka Maris , Sapata Alise , Spurin Ella , Puzule Līga , Sahmenko Genadijs , Bajare Diana 
Published: May 2024

To achieve optimal strength and printability, mortars used in 3D printing typically contain high proportions of cement and other fine-grained powders. Consequently, the majority of mixtures used in 3D printing have high carbon footprint. Hence, there arises a critical need to study alternative supplementary cementitious materials aimed at reducing the environmental impact of mortars used in 3D printing. The use of oil shale ash as a partial substitute for cement not only addresses this issue but also presents an opportunity to repurpose waste from power plants in the Baltic states, where oil shale is intensively utilized.In this study, the influence on mechanical properties and durability of cement-based mortars was evaluated by substituting cement with oil shale ash in varying quantities. Specifically, 0% to 40% of cement mass was replaced with oil shale ash. Life cycle assessment (LCA) was performed for each mixture. By analyzing the material properties alongside the environmental impact for each mixture, the optimal percentage of substitute was determined.For the determination of the mechanical properties of each mixture, compressive and flexural strength tests were conducted on 3D printed samples in various directions, as well as on cast samples. To assess the durability of each mixture, freeze-thaw tests were performed on both 3D printed and cast samples.From the obtained results, we developed an algorithm that chooses the optimal mixture proportioning. Depending on material performance requirements set in the beginning, this algorithm gives the exact proportions of oil-shale ash and cement for the mixture, by taking into account both desired material properties and carbon dioxide emissions. As a result, an environmentally friendly cement-based mixture is obtained without losing the desired properties. By using this algorithm, it is possible to create a mortar with properties comparable to concrete with strength class C30/37 while reducing carbon emissions by 15% to 30%.
Assessing the Applicability of Solar Thermal Technologies for Industrial Tea Drying
Authors: Seyitini Luckywell , Enweremadu Christopher Chintua 
Published: May 2024

Most process heat being used for various industrial applications is supplied from fossil fuels. Coal, gas, and wood fuel are the most used heat resources which usually power steam boilers for production of heat used in a wide range of industrial processes. Since economic growth is largely linked to industrial production, it implies that, a shift towards use of clean energy technologies in industries is crucial to meet the rising demand of process heat while, cutting down carbon emissions to mitigate climate change. Solar thermal systems have over the past years shown potential as a practical alternative to fossil fuels for production of heat for several applications including, water and space heating, industrial process heating and electricity generation in thermal power plants. This study seeks to assess the feasibility of employing solar thermal technologies for drying purposes at Tingamira-Tanganda Tea estate in Zimbabwe. Systems advisor model (SAM) was applied to simulate performance of linear Fresnel (LF) and parabolic trough (PT) solar thermal technologies for industrial tea drying. Information on daily heat demand, required process temperatures and current heat sources was obtained to inform the design process of the proposed solar thermal systems. LF system exhibited better techno-economic performance. It requires a smaller collector area (360 m2) with a lower initial capital cost which is about 8% cheaper. Moreover, it produces higher annual energy at lower levelized cost of heat for solar multiples higher than 1. Carbon footprint of the factory would be reduced by about 114 tonnes CO2 annually. Sensible thermal energy storage technology can be considered for back up heat and heat recovery.
Sound Absorption Evaluation and Analysis Of Different Hemp Fiber Types
Authors: Strazdas Edgaras , Januševičius Tomas 
Published: May 2024

In recent years, the global conversation surrounding sustainable practices and environmentally friendly alternatives has gained significant momentum. Hemp fiber presents a compelling alternative to conventional sound-absorbing materials, such as fiberglass, foam, and mineral wool. Hemp fiber offers a plethora of positive environmental aspects from mitigating deforestation to reducing carbon emissions. In this study, six different types of hemp fiber samples were tested: Bleached hemp fiber (BHF), Cottonized hemp fiber (CHF), Boiled Cottonized hemp fiber (BCHF), Decorticated well stripped hemp fiber (DWSHF), Decorticated short, not combed hemp fiber (DSNCHF) and Decorticated short hemp fiber with 40% hurds (DSHFH). The sound absorption was measured using the impedance tube, transfer function method in accordance with ISO 10534-2 standard. The hemp fiber samples were changed in thickness of 20, 40, 60 mm and density from 50 to 250 kg/m3 in steps of 50 kg/m3. It has been found that all of hemp fiber types absorbs sounds of medium (600-2000 Hz) and high (2500-5000 Hz) frequencies very well. The sound absorption coefficient reaches up to 0.99 at medium and high frequencies. Absorption peaks occur at frequencies of 1000, 1250, 1600, 2500, 3150, 4000, 5000 Hz, depending on the measured fiber thickness, density, and type of measured fiber. It has been determined that in all cases, increasing the thickness of the hemp fiber sample increases sound absorption at lower frequencies. Sound absorption at lower frequencies also generally increases when using denser fibers, but this also depends on the type of hemp fiber being studied. Peaks in the sound absorption coefficient of 0.96-0.99 were mostly achieved when testing fibers with densities of 50, 100, and 150 kg/m3.
Inclination effects on wave characteristics in annular gas–liquid flows
Authors: Al‐Sarkhi A. , Sarica C. , Magrini K. 
Published: April 2011

AbstractMeasurements of wave characteristics have been conducted in a 0.0762 m internal diameter (ID) pipe at inclinations of 0°, 10°, 20°, 45°, 60°, 75°, and 90° from horizontal. Wave celerity and frequency are very strongly dependent on modified Lockhart–Martinelli parameter, X*, and the inclination angle. Wave amplitude increases with increasing liquid film thickness at the bottom of the pipe. Wave amplitude depends on liquid film thickness for any pipe diameter, surface tension, and viscosity. Strouhal number (dimensionless wave frequency) decreases with increasing X*. Effect of pipe diameter, surface tension, and liquid viscosity on the liquid film Reynolds number, ReLF, was studied. ReLF variation with X* is not sensitive to the surface tension and less sensitive to the pipe diameter. However, ReLF is very sensitive to the viscosity of the flowing liquid. Correlations for wave celerity, amplitude, frequency, and liquid film Reynolds number are proposed. © 2011 American Institute of Chemical Engineers AIChE J, 2012
A particle‐scale index in the quantification of mixing of particles
Authors: Chandratilleke G. R. , Yu A. B. , Bridgwater J. , Shinohara K. 
Published: April 2011

AbstractDiscrete element method (DEM) is a useful tool for obtaining details of mixing processes at a particle scale. It has been shown to satisfactorily describe the flow structure developed in bladed mixers. Here, the advantage is taken of the microstructure gained from DEM to evaluate how best to quantify the microstructure created by mixing. A particle‐scale mixing index (PSMI) is defined based on coordination numbers to represent the structure of a particle mixture. The mixture quality is then analyzed qualitatively and quantitatively in three different ways: a macroscopic mixing index based on the conventional approach, coordination number, and PSMI. Their effectiveness is examined based on DEM data generated for different particle loading arrangements and binary mixtures of particles with various volume fractions, size ratios, and density ratios. Unlike the two other methods, PSMI reveals in a straightforward manner whether a binary mixture of different particles is mixing or segregating over time, while being able to detect particle‐scale structural changes accompanying the mixing or segregation processes in all the mixtures investigated. Moreover, PSMI is promising in that it is not influenced by the size and number of samples, which afflict conventional mixing indexes. © 2011 American Institute of Chemical Engineers AIChE J, 2012
Enhanced lipid and biodiesel production from glucose‐fed activated sludge: Kinetics and microbial community analysis
Authors: Mondala Andro H. , Hernandez Rafael , French Todd , McFarland Linda , Santo Domingo Jorge W. , Meckes Mark , Ryu Hodon , Iker Brandon 
Published: April 2011

AbstractAn innovative approach to increase biofuel feedstock lipid yields from municipal sewage sludge via manipulation of carbon‐to‐nitrogen (C:N) ratio and glucose loading in activated sludge bioreactors was investigated. Sludge lipid and fatty acid methyl ester (biodiesel) yields (% cell dry weight, CDW) were enhanced via cultivation in activated sludge bioreactors operated at high initial C:N ratio (≥40:1) and glucose loading (≥40 g L−1). Under C:N 70, 60 g L−1 glucose loading, a maximum of 17.5 ± 3.9 and 10.2 ± 2.0% CDW lipid and biodiesel yields, respectively, were achieved after 7 d of cultivation. The cultured sludge lipids contained mostly C16C18 fatty acids, with oleic acid consistently accounting for 40–50% of the total fatty acids. Microbial composition in activated sludge exposed to C:N 70 shifted toward specific gammaproteobacteria, suggesting their relevance in lipid production in wastewater microbiota and potential value in biofuel synthesis applications. © 2011 American Institute of Chemical Engineers AIChE J, 2012