bluuebunny/crossref_metadata_2025 huggingface dataset:
Life Management of Creep Strength Enhanced Ferritic Steels—Solutions for the Performance of Grade 91 Steel
Authors: Coleman Kent
Published: February 2025

Recent in-service experiences have revealed critical vulnerabilities in creep-strength enhanced ferritic (CSEF) steels, with cracking potentially occurring surprisingly early in a component's operational life. Fabrication irregularities have been found to introduce substantial property deficiencies compared to average material performance, raising serious concerns among industry users regarding personnel safety and equipment reliability. In response, a collaborative research program between the Electric Power Research Institute and Structural Integrity Associates, Inc. has been initiated to comprehensively address these critical material challenges. The program's extensive scope encompasses a holistic approach to material management, including rigorous investigations spanning material procurement, shop fabrication, field erection, and appropriate quality assurance procedures for each implementation phase. The research will systematically examine the behavior of both base and weld metals, with a strategic focus on developing a comprehensive life prediction methodology and optimizing maintenance protocols. Beyond its core technical objectives, the program is designed to facilitate knowledge exchange through regular participant workshops, where both program-generated findings and global utility experiences will be critically reviewed and discussed to ensure the research maintains optimal direction and relevance. This collaborative effort aims to establish a robust framework for understanding, mitigating, and managing the complex challenges associated with CSEF steel materials in high-performance industrial applications.
Creep Behavior and Microstructural Analysis of FB2 Trial Rotor Steel
Authors: Di Gianfrancesco A. , Cipolla L. , Venditti D. , Neri S. , Calderini M.
Published: February 2025

The development of new ferritic-martensitic steels for rotor applications was a primary focus of the joint research projects COST 501 and COST 522. During COST 501, multiple trial compositions of 9-10% chromium steels underwent comprehensive testing, with the COST 522 project ultimately selecting the most promising candidate, FB2, a 10% Cr steel containing cobalt and boron additions, notably without tungsten. Società delle Fucine (SdF) successfully produced an FB2 prototype rotor using a conventional manufacturing process involving ladle furnace and vacuum degassing techniques. A comprehensive creep test program was initiated to characterize the full-size component's properties, with results demonstrating consistency with laboratory material performance in both creep resistance and ductility. The extensive testing, which exceeded 30,000 hours, aimed to achieve a 15-20 MPa improvement over Grade 92, targeting 100,000 creep hours at 600°C. Complementing the mechanical testing, a parallel microstructural investigation program was launched to evaluate structural evolution and gain deeper insights into boron's role as a creep-strengthening element in advanced ferritic-martensitic steels.
Manufacturing Experiences and Investigation of Properties of 12% Cr Steel Forgings for Steam Turbines
Authors: Mikami M. , Wakeshima Y. , Miyata T. , Kawano K.
Published: February 2025

Demand of 9-12% chromium steel rotor forgings becomes higher from point of view of environmental protection in coal fired fossil power generations. Japan Casting & Forging Corporation (JCFC) has manufactured 9-12% Cr steel rotor forgings with JCFC's original techniques since 1991. Recently, type E steel developed by European COST program has been trial melted to meet the demand of such high Cr steel forgings in the world. Full size two forgings have been manufactured from approximately 70 ton ingot applying Electro Slag Hot Topping by JCFC (ESHT-J) process. One of the trial forgings has been austenitized at higher temperature in the quality heat treatment to improve long term creep strength. Their productivities and sufficient qualities have been ascertained.
Development of Ni-Based Superalloy for Advanced 700°C-Class Steam Turbines
Authors: Yamamoto Ryuichi , Kadoya Yoshikuni , Nakano Takashi , Tanaka Yoshinori , Magoshi Ryotaro , Kurata Seiji , Ueta Shigeki , Noda Toshiharu
Published: February 2025

Advanced 700°C-class steam turbines require the use of austenitic alloys instead of conventional ferritic 12Cr steels, which are inadequate in creep strength and oxidation resistance above 650°C. While austenitic alloys offer improved performance, they traditionally possess a significantly higher coefficient of thermal expansion (CTE) compared to 12% Cr steels. Through extensive research, the authors systematically investigated the effects of various alloying elements on thermal expansion and high-temperature strength. As a result of these investigations, they developed "LTES700," an innovative nickel-based superalloy specifically designed for steam turbine bolts and blades. This novel alloy uniquely combines a coefficient of thermal expansion comparable to 12Cr steels with high-temperature strength equivalent to conventional superalloys like Refractaloy 26, effectively addressing the critical limitations of previous materials.
Nano-Structured Erosion Resistant Coatings for Gas and Steam Turbines
Authors: “Swami” Swaminathan V.P. , Wei Ronghua , Gandy David W.
Published: February 2025

Erosion from solid and liquid particles in gas turbine and steam turbine compressors degrades efficiency, increasing downtime and operating costs. Conventional erosion-resistant coatings have temperature and durability limitations. Under an Electric Power Research Institute (EPRI) project, ultra-hard nano-coatings (~40 microns thick) were developed using Plasma Enhanced Magnetron Sputtering (PEMS). In Phase I, various coatings—including TiSiCN nanocomposites, stellite variants, TiN monolayers, and multi-layered Ti-TiN and Ti-TiSiCN—were deposited on turbine alloys (Ti-6Al-4V, 17-4 PH, Custom-450, and Type 403 stainless steel) for screening. Unlike conventional deposition methods (APS, LPPS, CVD, PVD), PEMS employs high-current-density plasma and heavy ion bombardment for superior adhesion and microstructure density. A novel approach using trimethylsilane gas successfully produced TiSiCN nanocomposites. Stellite coatings showed no erosion improvement and were discontinued, but other hard coatings demonstrated exceptional erosion resistance—up to 25 times better than uncoated substrates and 20 times better than traditional nitride coatings. This paper details the deposition process, coating properties, adhesion tests, and characterization via SEM-EDS, XRD, nanoindentation, and sand erosion tests.
Ferritic and Austenitic Grades for the New Generation of Steam Power Plants
Authors: Caminada S. , Cipolla L. , Cumino G. , Di Gianfrancesco A. , Minami Y. , Ono T.
Published: February 2025

The increasing steam parameters in modern high-efficiency fossil fuel power plants demand advanced materials with enhanced creep strength for operation under extreme temperature and pressure conditions. Tenaris has focused on developing ferritic-martensitic and austenitic grades for tube and pipe applications. At TenarisDalmine, efforts on ferritic-martensitic steels include ASTM Grade 23, a low-alloyed alternative to Grade 22 with 1.5% W, offering good weldability, creep resistance up to 580°C, and cost competitiveness. Additionally, ASTM Grade 92, an improved version of Grade 91, provides high creep strength and long-term stability for components like superheaters and headers operating up to 620°C. At TenarisNKKT R&D, austenitic steel development includes TEMPALOY AA-1, an improved 18Cr-8NiNbTi alloy with 3% Cu for enhanced creep and corrosion resistance, and TEMPALOY A-3, a 20Cr-15Ni-Nb-N alloy with superior creep and corrosion properties due to its higher chromium content. This paper details the Tenaris product lineup, manufacturing processes, and key material properties, including the impact of shot blasting on the steam oxidation resistance of austenitic grades. It also covers ongoing R&D efforts in alloy design, creep testing, data assessment, microstructural analysis, and damage modeling, conducted in collaboration with Centro Sviluppo Materiali.
The Use of Advanced Materials on Large Steam Turbines in Supercritical Steam Cycles in the Czech Republic
Authors: Prchlik L. , Polivka V. , Kapic M. , Duchek K.
Published: February 2025

The paper summarizes several years of research on the application of modern materials in the design of large steam turbines operating at high temperatures. The use of 9-12% chromium steels on main steam turbine components, the application of abradable coatings in seals and the seize/corrosion protection of selected components by modern surfacing techniques are presented. Results of materials long-term testing supported by the field application at elevated steam temperatures were used to verify the new material solutions and manufacturing techniques. The second section of the paper presents the design of a new 660 MW supercritical power plant to be built in the Czech Republic between 2008 and 2010. The unit parameters and steam cycle characteristics are presented together with the visualization of the new block. The steam turbine design is discussed with respect to the application of advanced materials.
Novel Hafnium-Containing Steels for Power Generation
Authors: Grice R.J. , Faulkner R.G. , Yin Y.
Published: February 2025

Research has demonstrated that creep damage in power plant steels is directly linked to grain boundary precipitates, which serve as nucleation sites for cavities and micro-cracks. The formation of M23C6 carbides along grain boundaries creates chromium-depleted zones vulnerable to corrosion and significantly reduces creep life due to rapid coarsening. Through combined Monte Carlo grain boundary precipitation kinetics and continuum creep damage modeling, researchers have predicted that increasing the proportion of MX-type particles could enhance creep performance. This hypothesis was tested using hafnium-containing steel, which showed improved creep and corrosion properties in 9% Cr steels. Ion implantation of Hafnium into thin foils of 9 wt% Cr ferritic steel resulted in two new types of precipitates: hafnium carbide (MX-type) and a Cr-V rich nitride (M2N). The hafnium carbide particles, identified through convergent beam diffraction and microanalysis, appeared in significantly higher volume fractions compared to VN in conventional ferritic steels. Additionally, Hafnium was found to eliminate M23C6 grain boundary precipitates, resulting in increased matrix chromium concentration, reduced grain boundary chromium depletion, and enhanced resistance to intergranular corrosion cracking.
Long-Term Crack Behavior under Creep and Creep-Fatigue Conditions of Heat Resistant Steels
Authors: Scholz A. , Berger C. , Mueller F. , Klenk A.
Published: February 2025

High temperature components with notches, defects and flaws may be subject to crack initiation and crack propagation under long-term service conditions. To study these problems and to support an advanced remnant life evaluation, fracture mechanics procedures are required. Since a more flexible service mode of power plants causes more start up and shut down events as well as variable loading conditions, creep-fatigue crack behavior becomes more and more decisive for life assessment and integrity of such components. For steam power plant forged and cast components, the crack initiation time and crack growth rate of heat resistant steels were determined in long-term regime up to 600 °C. Component-like double edge notched tension specimens have been examined. The results are compared to those obtained using the standard compact tension specimen. Crack initiation time and crack growth rate have been correlated using the fracture mechanics parameter C*. The applicability of the stress intensity factor KI to describe the creep crack behavior is also being assessed. A modified Two-Criteria-Diagram was applied and adapted in order to recalculate crack initiation times under creep-fatigue conditions. Recommendations are given to support the use of different fracture mechanics parameters in order to describe the long-term crack behavior under creep and/or creep-fatigue conditions.
Failure Behavior of High Chromium Steel Welded Joints Under Creep and Creep-Fatigue Conditions
Authors: Takahashi Y. , Tabuchi M.
Published: February 2025

The strength of welded joints in high-chromium steels is a critical concern for operators of ultra-supercritical thermal power plants. To investigate this, a series of creep-fatigue tests with tensile strain holds were conducted on welded joints of two widely used high-chromium steels: Grade 91 and Grade 122. The tests revealed that failure consistently occurred in the fine-grain heat-affected zone, even at relatively low temperatures and short durations, whereas in simple creep tests, failure occurred in the plain base metal region. Four different procedures were used to predict failure life, and their results were compared with experimental data. Among them, a newly proposed energy-based approach provided the most accurate failure life estimations, independent of material type and temperature.
Alternative Filler Materials for Dissimilar Metal Welds Involving P91 Materials
Authors: Coleman K. , Gandy D.
Published: February 2025

In the late 1980s, the domestic utility industry experienced failures in dissimilar metal welds (DMWs) between low-alloy ferritic tubing and austenitic tubing in superheaters and reheaters. Extensive research by EPRI identified that nickel-based filler metals significantly improved service life compared to 309 SS filler metals. Additionally, optimized joint geometries and increased weld metal reinforcement were found to further enhance durability. A new nickel-based filler metal was developed with thermal expansion properties similar to the low-alloy base metal, along with a low chromium content designed to minimize the carbon-denuded zone. However, this filler metal was never commercialized due to its tendency to microfissure, which resulted in a shorter-than-expected service life. This paper explores further investigations into the microfissuring of this filler metal and examines long-term testing to assess its suitability for high-temperature applications.
Design Considerations for Advanced Materials in Oxygen-Fired Supercritical and Ultra-Supercritical Pulverized Coal Boilers
Authors: Hack Horst , Seltzer Andrew , Stanko Greg
Published: February 2025

As the demand for worldwide electricity generation grows, pulverized coal steam generator technology is expected to be a key element in meeting the needs of the utility power generation market. The reduction of greenhouse gas emissions, especially CO2 emissions, is vital to the continued success of coal-fired power generation in a marketplace that is expected to demand near-zero emissions in the near future. Oxycombustion is a technology option that uses pure oxygen, and recycled flue gas, to fire the coal. As a result, this system eliminates the introduction of nitrogen, which enters the combustion process in the air, and produces a highly-concentrated stream of CO2 that can readily be captured and sequestered at a lower cost than competing post-combustion capture technologies. Oxycombustion can be applied to a variety of coal-fired technologies, including supercritical and ultra-supercritical pulverized coal boilers. The incorporation of oxycombustion technology in these systems raises some new technical challenges, especially in the area of advanced boiler materials. Local microclimates generated near and at the metal interface will influence and ultimately govern corrosion. In addition, the fireside corrosion rates of the boiler tube materials may be increased under high concentration oxygen firing, due to hotter burning coal particles and higher concentrations of SO2, H2S, HCl and ash alkali, etc. There is also potential to experience new fouling characteristics in the superheater and heat recovery sections of the steam generator. The continuous recirculation of the flue gases in the boiler, may lead to increasing concentrations of deleterious elements such as sulfur, chlorine, and moisture. This paper identifies the materials considerations of oxycombustion supercritical and ultrasupercritical pulverized coal plants that must be addressed for an oxycombustion power plant design.
A abordagem comunicacional no apoio às ações das universidades na década do envelhecimento saudável
Authors: Ricardo Duarte  , Simone Martins
Published: February 2025

Este ensaio teórico apresenta uma proposta para estudo qualitativo que busca complementar o levantamento das ações no projeto das Universidades na Década do Envelhecimento Saudável. Tendo o foco nas ações da extensão universitária, o estudo chama a atenção para o processo comunicativo e a avaliação das ações da Universidade na relação com a população ativa +60. Adotamos a abordagem comunicacional (Quéré, 1991), o conceito de enquadramento (França et al., 2014) aplicado ao estudo das organizações e a visão de pesquisa empírica na comunicação apresentada por Kunsch (2017). Os contextos urgentes solicitam projetos sustentáveis, políticas públicas inovadoras e redimensionam o papel da extensão nas Universidades. Os organismos internacionais (ONU, OMS e OPAS) e nacionais (IBGE) já mencionaram a significativa mudança que ocorre na estrutura demográfica mundial, com o crescimento vertiginoso da população ativa +60, fato que irá exigir políticas públicas inovadoras e sustentáveis.
Some Heartbreak Survival Tips from Dr. Anna
Authors: Beyer Anna
Published: February 2025

Never try to get over heartbreak with pop music. It will only make it worse, becauseit conditions you to think:‘I am in love! I am in love! I am heartbroken! I am heartbroken!’. Just listen to a random pop music radio station for proof. Rather try wordlessmusic (classical or electronic or meditation music).
A Well-Thought-Out Review on Guidelines and Recommendations for Urology Standards of Care During the Covid-19 Widespread Disease and Telemedicine Online Visits in Urology
Authors: Heidari Alireza
Published: February 2025

To decide/discern out the hits/consequences of COVID-19 tremendous disease-related modifications and software-absolutely stated/particular (features/ traits/ trends) on the (land-area-primarily based/area) (many exclusive kinds of human beings or things) of the 2021 and 2022 (medical care associated with the urinary system) in shape instructions. We collected publicly to be had information to compare suit effects in 2021 and 2022 to the preceding 5 software cycles (2018-2022). (numbers that trade/matters that exchange) included residency program class length, application and resident AUA segment, and program and resident medical college. Univariate comparisons have been made with Fisher's t-tests. Odds ratios had been calculated following multivariable analysis.
Nasopharyngeal myiasis presenting in onset Diabetes Mellitus: A Case Report
Authors: Baharanyi Dominique Bigabwa
Published: February 2025

Background

Despite their confirmed nutritive usage, maggots, practiced in Uganda as poultry feed, are known to cause myiasis as an infection of a fly larva in human tissue. The risk of myiasis increases in individuals with immunocompromised such as diabetes mellitus (DM). This study aimed to report a rare case of nasopharyngeal myiasis with accidental type 2 diabetes mellitus diagnosis.

Case presentation

A 60-year-old female patient was referred to Kampala International University - teaching hospital with a chief complaint of bloody sneeze and nose maggot discharge for one week. The otorhinolaryngology team reported a swollen painful zygomatic arch, and the rhinoscopy revealed no active bleeding from the nose, and no maggots seen, examining the throat, bloodish secretion descending from the nasopharynx was identified from the single maggot sneezed, parasitological investigation identified Lucille sericata the causative pathogen. The patient was diagnosed with nasopharyngeal myasis with aspiration pneumonia associated sepsis and, new onset of type 2 diabetes mellitus. Treatment included larval removal by sneeze that helped to expel the last maggot, wound care by nasal irrigation using antiseptic solutions, administration of ivermectin, antibiotics, and insulin therapy to control blood sugar. After four days of the treatment, the patient was discharged from the hospital with resolved infection-controlled blood sugar levels and continued follow-up at the nearby facility.

Conclusion

risk factors for myiasis, clinical recognition, and proper therapy are prominent. rhinoscopy coupled with other means like nasal antiseptic, antiparasitic drug administration, antibiotic, and insulin therapy effectively managed nasopharyngeal myiasis.
Sebaran dan Kesesuaian Habitat Pendaratan Penyu di Pulau Pandan Kawasan Konservasi Pulau Pieh
Authors: Hanif Andriyatno , Damanhuri Harfiandri , Suparno Suparno , Rusli Mohd Uzair
Published: February 2025

Penelitian sebaran dan kesesuaian pendaratan penyu Pulau Pandan dilakukan pada Kawasan Konservasi Pulau Pieh, Sumatera Barat. Tujuan penelitian melihat kondisi sebaran pendaratan penyu dan kesesuaian habitat dengan pendekatan ekologi yang terdiri dari faktor fisik dan non fisik. Penelitian dilakukan pada bulan Januari – Juni 2022 dengan pengambilan data sebaran pendaratan, suhu, kelembaban, substrat, dan kemiringan pantai, serta diperkuat dengan data sekunder. Metode yang digunakan adalah spasial dengan Sistem Informasi Geospasial untuk menginterpolasi 6 aspek data penelitian. Hasil analisis sebaran pendaratan penyu pada empat stasiun penelitian Pulau Pandan frekuensi tinggi pada stasiun 1 dengan jumlah 38 dan 2 sebanyak 30, kategori sedang pada stasiun 4 sebanyak 22, sementara terendah stasiun 3 yaitu 6. Kesesuaian habitat pendaratan penyu Pulau Pandan kategori sangat sesuai seluas 0,24 ha, sesuai 1,59 ha, dan kurang sesuai 0,005 ha. Pengelolaan konservasi jenis penyu secara optimal dapat dilakukan dengan menerapkan hasil penelitian sebaran dan kesesuaian habitat pendaratan penyu dengan kriteria sangat sesuai sebagai zona inti perlindungan penyu untuk menyeimbangkan fungsi keberlanjutan dan peningkatan pemanfaatan di kawasan konservasi.
Analisis Kesesuaian Kawasan untuk Pengembangan Marikultur di Kabupaten Pulau Morotai
Authors: Taher Muhammad Nur , Aris Muhammad , Wahidin Nurhalis , Abdullah Taufiq
Published: February 2025

Indonesia memiliki perairan yang luas dengan potensi besar untuk pengembangan marikultur. Kabupaten Pulau Morotai adalah salah satu wilayah strategis untuk pengembangan marikultur. Penelitian ini bertujuan untuk menganalisis kesesuaian lahan untuk pengembangan marikultur berbasis keramba jaring apung (KJA) di Kabupaten Pulau Morotai. Penelitian dilakukan di perairan Pulau Galo-Galo dan Pulau Loleba. Pengambilan data dilakukan pada enam stasiun di Pulau Galo-Galo dan empat stasiun di Pulau Loleba. Parameter kualitas air yang diamati meliputi parameter fisik, kimia, dan biologi. Data parameter fisik kualitas air yang diamati adalah keterlindungan, kedalaman, kecerahan air, kecepatan arus, suhu perairan, dan salinitas. Data parameter kimia kualitas air yang diamati adalah pH air, DO, TAN, nitrit, nitrat, dan fosfat. Sementara data parameter biologi yang diamati adalah kelimpahan plankton. Analisis data kesesuaian lahan dilakukan menggunakan GIS. Hasil penelitian menunjukkan bahwa perairan tersebut memiliki karakteristik terlindung dengan kedalaman berkisar antara 15-23 meter, kecepatan arus 0,20-0,50 m/s, kecerahan lebih dari 5 meter, suhu 24,30-30,70oC, dan salinitas 26-29 ppt. Parameter kimia menunjukkan nilai DO antara 3,10-5,50 mg/L, pH 7, TAN 0,004-0,078 mg/L, nitrit 0,008-0,062 mg/L, nitrat 0,002-0,052 mg/L, dan fosfat 0,007-0,017 mg/L. Parameter biologi menunjukkan kelimpahan plankton di perairan Pulau Galo – Galo adalah 4,1×109 sel/L dan Pulau Loleba 8,5×109 sel/L. Analisis kesesuaian lahan menunjukkan bahwa 1000 Ha lahan termasuk kategori sangat sesuai (S1) dan 1000 Ha lainnya termasuk kategori sesuai (S2). Kesimpulan penelitian ini adalah kawasan Pulau Galo-Galo dan Loleba memiliki potensi besar untuk pengembangan marikultur berbasis KJA karena kondisi kualitas air yang optimal dan kesesuaian lahan yang mendukung.
Strategi Pengelolaan Ekosistem Mangrove Sebagai Upaya Adaptasi Perubahan Iklim di Pesisir Tanjungpiayu Kota Batam
Authors: Zakia Rahima , Lestari Febrianti , Apdillah Dony , Zulfikar Andi
Published: February 2025

Penelitian ini dilakukan dari September 2023 hingga Mei 2024 di kawasan hutan mangrove pesisir Tanjungpiayu Kota Batam. Tujuan dari penelitian ini adalah untuk menganalisis potensi biomassa, stok karbon, dan serapan karbon di kawasan hutan mangrove Tanjungpiayu, menghitung nilai ekonomi karbon hutan mangrove Tanjungpiayu, serta untuk merumuskan pengelolaan ekosistem mangrove dalam upaya adaptasi perubahan iklim di pesisir Tanjungpiayu Kota Batam. Lokasi penelitian ditentukan melalui metode survei, dimana titik sampling dipilih secara purposive sampling. Untuk menghitung biomassa pohon dilakukan tanpa merusak (nondestructive), dengan mengukur diameter batang setinggi dada (Diameter at Breast Height/DBH) yang diambil pada ketinggian sekitar 1,3 m dari permukaan tanah. Selanjutnya, perhitungan dilakukan dengan model allometrik untuk menghitung potensi biomassa dan penyimpanan karbonnya. Penentuan strategi pengelolaan menggunakan metode AHP dengan responden sejumlah 7 orang sebagai informan kunci. Berdasarkan hasil analisis data nilai total biomassa, stok karbon dan serapan CO2 pada lokasi penelitian adalah sebesar 150,32 ton/ha, 70,65 ton/ha dan 259,06 tonC/ha. Hal ini menunjukkan bahwa mangrove Tanjungpiayu memiliki potensi sebagai penyerap karbon atmosfer. Berdasarkan perhitungan nilai ekonomi karbon mangrove di pesisir Tanjungpiayu adalah Rp 25.054.254,16 (pasar sukarela) dan Rp 65.475.117,55 (CDM). Berdasarkan perolehan skor tertinggi aspek saintek menjadi prioritas dalam mempertimbangkan alternatif strategi pengelolaan ekosistem mangrove. Alternatif prioritas dengan skor tertinggi untuk pengelolaan ekosistem mangrove di pesisir Tanjungpiayu berupa pendampingan peningkatan keterampilan masyarakat dalam pengelolaan ekosistem mangrove berbasis adaptasi perubahan iklim.
Kelas Ukuran dan Hubungan Panjang Berat Ikan Seluang Pipih (Oxygaster anomalura Van Hesselt, 1823) di Desa Aek Kanan Kabupaten Padang Lawas Utara
Authors: Jani Nur , Khairul Khairul , Harahap Hasmi Syahputra
Published: February 2025

Penelitian terkait aspek biologi pada ikan penting dilakukan, mengingat belum adanya data Oxygaster anomalura dari wilayah perairan Desa Aek Kanan. Data dan informasi aspek biologi ikan berguna di dalam upaya pengelolaan sumber ikan Oxygaster anomalura secara lestari. Penelitian bertujuan memperoleh data kelas ukuran dan hubungan panjang berat Oxygaster anomalura di Desa Aek Kanan, Kabupaten Padang Lawas Utara. Penelitian menggunakan metode purposive sampling dengan penentuan stasiun pengamatan berdasarkan perbedaan karakteristik habitat. Sampel ditangkap pada bulan Juni, Juli, dan Agustus 2024. Ikan yang tertangkap kemudian diukur panjang total dan berat. Data hasil penelitian di sajian dalam bentuk tabel dan grafik dengan menggunakan aplikasi Microsoft Excel 2010. Berdasarkan hasil penelitian ini diperoleh 7 ukuran kelas dengan komposisi yang mendominasi kelas ukuran 115-127 mm sebanyak 20 individu dan paling sedikit diperoleh kelas ukuran 154-166 mm (2 ekor). Analisis hubungan panjang berat ikan Oxygaster anomalura mendapatkan nilai b = 1,54, selanjutnya dikatakan bersifat allometrik negatif.
Purifikasi Ekstrak Gracilaria sp. Asal Pamekasan sebagai Kandidat Senyawa Antioksidan
Authors: Chandra AB , Hafiludin Hafiludin , FA Hanifah , PFD Yanti
Published: February 2025

Rumput laut Gracilaria sp. tergolong dalam divisi thallophyta memiliki kandungan senyawa bioaktif seperti flavonoid, alkaloid, saponin, steroid, dan tanin. Hasil riset terdahulu menunjukkan ekstrak kasar metanol Gracilaria sp. asal Pamekasan mempunyai aktivitas antioksidan dengan nilai IC50 sebesar 308,19 ppm. Penelitian lain menyebutkan bahwa purifikasi ekstrak kasar Gracilaria sp. mempengaruhi aktivitas antioksidan dan keberadaan senyawa bioaktif hasil pemurnian. Adapun tujuan utama dari penelitian ini adalah mengetahui aktivitas antioksidan fraksi hasil purifikasi kromatografi kolom ekstrak kasar Gracilaria sp. asal Pamekasan. Jumlah fraksi hasil purifikasi ekstrak metanol Gracilaria sp. asal Pamekasan dengan pelarut aseton:eter:n-heksana (3:2:6 v/v) dan pelarut n-heksana : etil asetat (7:3 v/v) berturut-turut diperoleh 22 fraksi dan 16 fraksi hasil kolom kromatografi. Dua fraksi terbaik hasil purifikasi dengan fase gerak aseton:eter:n-heksana yaitu fraksi 4 dan fraksi 6 dengan aktivitas antioksidan berturut-turut sebesar 223,14 ppm dan 231,64 ppm. Sedangkan dua fraksi terbaik hasil purifikasi dengan fase gerak n-heksana: etil asetat yaitu fraksi 2 dan fraksi 3 dengan aktivitas antioksidan berturut-turut sebesar 156,23 ppm dan 99,26 ppm. Hasil uji fitokimia pada fraksi aktif hasil purifikasi ekstrak Gracilaria sp. asal Pamekasan mempunyai kandungan senyawa bioaktif golongan fenol, alkaloid, saponin, triterpenoid, dan steroid. Aktivitas antioksidan pada fraksi aktif Gracilaria sp. asal Pamekasan menunjukkan aktivitas yang sangat lemah.
Mediaciones y sinergias en la formación de habilidades digitales en adultos mayores
Authors: Torres Roncancio José Valerio
Published: February 2025

Introducción: Los procesos de alfabetización digital con población de adulto mayor, representa un reto importante en la apropiación social y democratización del conocimiento; con la pandemia Covid-19 aumenta la necesidad de movilizar estrategias y enfoques pedagógicos alineados intereses y motivaciones personales de la población objeto de estudio. Metodología: La presente investigación tiene por objetivo generar una reflexión académica sobre las sinergias de esta índole, como surgen, y su aporte a la reducción del analfabetismo tecnológico. Para esto utiliza como referente la teoría de la andragogía y la pedagogía social; la metodología es cualitativa, apoyada en el método inductivo; la observación y la cartografía social son técnicas que permitirán identificar la percepción del participante frente al proceso. Resultados: Muestran que los participantes gozan de tener un alto impulso de aprender por emancipación a la dependencia familiar, sin embargo, la sobre estimulación de la internet, el lenguaje excluyente y la carencia de formación pertinente, impulsan un ausentismo y mal uso de las herramientas virtuales. Discusión y conclusión: es necesario dotar de carácter social, contextualizado el proceso educativo para mitigar la creciente apatía por lo virtual, promoviendo comunidades de aprendizaje y por ende la reducción de la brecha digital latente.
Participación infantil y narrativa oral, estrategias que fortalecen la dimensión socio-afectiva en niños de Soacha
Authors: Gómez Nubia Marcela
Published: February 2025

Introducción: La propuesta surge en Comuna Uno, Soacha, donde se carece de una estrategia pedagógica que fortalezca la dimensión socioafectiva de los niños a través de la participación infantil y la narrativa oral, reconociendo al niño como un sujeto crítico, reflexivo y autónomo. Metodología: La investigación se llevó a cabo bajo un enfoque cualitativo, diseño narrativo y el paradigma de Investigación-Acción, impactando a 320 niños de segundo a quinto de primaria. Resultados: Los resultados muestran que los niños con mayor acompañamiento adulto desarrollan empatía y se reconocen como sujetos activos que aportan a su contexto, proyectándose para transformar su comunidad y valorar a sus familias. Conclusiones: Se concluye que es fundamental continuar trabajando con la población infantil de Soacha, generando estrategias que fortalezcan su dimensión socioafectiva y apoyen su participación activa, reconociendo sus pensamientos, reflexiones, sentimientos y posturas frente a su entorno.
Memoria e Identidad: el patrimonio escrito y los archivos parroquiales en las islas Azores (Portugal)
Authors: Meyer Riera Anahi
Published: February 2025

Introducción: Con el objetivo de dignificar el patrimonio escrito y conservar la memoria divino-humana, surge el proyecto de salvaguarda de importantes documentos históricos parroquiales del archipiélago portugués, albergados en la catedral de Angra do Heroísmo y en las iglesias matrices de Ponta Delgada y Horta. Metodología: La investigación, desarrollada en las sedes de las islas Azores, reflexiona sobre la situación de estos archivos, considerando la información contenida, la calidad de su instalación, el estado de conservación de las colecciones y del edificio que los alberga. Se identificaron y describieron 135 metros lineales de documentos, datados entre mediados del siglo XVI y principios del XX. Resultados: La investigación revela que los registros de memoria estaban en el olvido, sepultados por décadas de almacenamiento inadecuado. Los resultados refuerzan la necesidad urgente de activar mecanismos para valorar estos documentos eclesiásticos y asegurar su conservación física y difusión intelectual. Discusión y Conclusiones: Se concluye que estos documentos son elementos esenciales para la construcción de la identidad colectiva insular y deben conservarse como legado socio-cultural para el futuro, garantizando su permanencia y difusión.
La trompeta sonora waka waqra de Quiñota y la identidad cultural (Chumbivilcas, Cusco, Perú)
Authors: Huamán Asillo Luis Daniel , Meléndez Palacios Bildon
Published: February 2025

Introducción: En el mundo existieron instrumentos musicales con diferentes sonidos; en Perú, tuvo un desarrollo propio, diverso y nuestros antepasados dejaron flautas, quenas, zampoñas, pitos y otros; se diversificaron, perfeccionaron, adaptándose a usos y costumbres de cada pueblo. Metodología: Descriptiva, enfoque cualitativo, estudio de campo etnohistórico, observación; muestreo probabilístico por conveniencia; entrevista en profundidad, con preguntas semiestructuradas dirigida a los actores de cuatro comunidades. Resultados: La trompeta sonora waka waqra, es producto de un sincretismo, los españoles trajeron el ganado vacuno y con los cachos del toro los comuneros lo construyeron, dándole forma de espiral con 19 a 21 recortes; surgió en la época colonial con antecedentes andinos, difundiéndose en la sierra centro y sur andino. Discusión: Instrumento clasificado como aerófono por calidad de sonido, su música es una práctica cultural, expresión simbólica, ritual, representa las tradiciones y costumbres ancestrales. Conclusiones: La música del waka waqra está presente en actos rituales, celebraciones, marca de ganado waka t’inkay, corridas de toros, festividades religiosas: Virgen Purificada, Patrón Santiago, Santa Rosa de Lima, expresando la identidad cultural del pueblo de Quiñota.
Tipos de adicciones presentes en estudiantes de kinesiología de la Universidad del Alba, Antofagasta 2023
Authors: Guerra Cofré Darinka , Cabello Rosas Fernanda , Hidalgo Gomez Adolfo
Published: February 2025

Introducción: Las adicciones más conocidas son a sustancias, pero la realidad es que también existen los comportamientos adictivos. Por esto se creó la hipótesis de que los estudiantes de kinesiología de la Universidad del Alba sede Antofagasta presentan varios tipos de adicciones siendo la más prevalente la nomofobia. Metodología: En este estudio de carácter cuantitativo descriptivo se presentan los resultados obtenidos por una encuesta realizada a 30 estudiantes de kinesiología de la Universidad del Alba sede Antofagasta. Objetivo: describir los tipos de adicciones que se presentan en dichos estudiantes. Resultados: indican que existe una gran dependencia a los aparatos electrónicos, predominando el celular, esto se evidencia, ya que los porcentajes son bastantes altos en comparación a la adicción a los videojuegos y drogas. Conclusiones: la drogadicción no es la adicción más prevalente entre los estudiantes de kinesiología de la Universidad del Alba, sede Antofagasta.
Relevance of Humanistic Education in Faculties of Experimental Sciences: A Comprehensive Study
Authors: Gimenez Armentia Pilar , Viñado Otero Fernando
Published: February 2025

Introduction: The university has evolved to adapt to recent changes, prioritizing specialization at the expense of holistic education. This article examines how this transformation has created a gap between the humanities and scientific disciplines, displacing critical reflection with efficiency. Our objectives are to explore the historical foundations of the university to preserve its essence and to argue the importance of comprehensive education through a concrete case in the Faculty of Experimental Sciences at Universidad Francisco de Vitoria, which integrates humanities subjects and interdisciplinary activities into its programs. Methodology: The research conducted has been descriptive, using both quantitative and qualitative experimental methodologies in line with the proposed objectives. The empirical study was conducted with 1690 students, showing that comprehensive and humanistic education improves learning in experimental sciences. Conclusions: The results highlight the need for innovative methodologies that foster integral knowledge and the intersection between science and the humanities, emphasizing the importance of future scientists studying humanities subjects to develop a broader understanding of reality and recognize the limits of the scientific method.
The European approach to fostering determination and self-confidence in primary school students
Authors: Artyushenko Andrii , Yahodin Serhii
Published: February 2025

The article provides an in-depth analysis of the European experience in fostering determination and self-confidence in primary school students, highlighting these qualities as essential for successful socialization and adaptation in modern society. Educational practices in Finland, Germany, and Poland are examined, focusing on innovative teaching methods that contribute to students’ personal growth. In Finland, significant emphasis is placed on creating a supportive learning environment that enhances emotional well-being through individualized approaches and programs such as KiVa, which develop confidence and social interaction skills. Germany implements self-reflection programs and project-based learning, such as the Schülerfirma (“School Company”) initiative, enabling children to gain practical skills in decision-making, responsibility, and teamwork. Poland prioritizes mentoring programs and extracurricular activities that foster mutual support among students, strengthen emotional resilience, and build leadership qualities. The authors emphasize the importance of adapting these European practices to the Ukrainian education system while considering national resources, cultural traditions, and methodological frameworks. The primary challenges identified include insufficient teacher preparation, limited material resources, and an overloaded curriculum. To address these issues, the article proposes implementing specialized teacher training programs, initiating pilot projects in selected schools, and developing tailored programs to build determination and confidence among younger students. Future research directions are outlined, focusing on evaluating the effectiveness of innovative methods within Ukraine’s educational framework, assessing their impact on students’ personal development, and designing integrated programs inspired by successful European models. Implementing these practices in Ukraine will foster the harmonious development of primary school students, nurturing their emotional stability, leadership skills, and readiness to face contemporary challenges.
ANALYSIS OF THE TERRITORY OF THE DYKANKA COMMUNITY IN ACCORDANCE WITH SUITABILITY FOR CONSTRUCTION
Authors: Tkachenko I. V. , Lytvynenko T. P. , Bondarenko R. А. , Kupriienko B.
Published: February 2025

The use of modern technologies greatly simplifies the calculation and analysis of data that we use for further use in planningand construction. A study was conducted to determine favorable locations for construction activities. 80.6% of suitable territories for construction, 15% less suitable, 4.4% unsuitable. The use of QGIS to construct a slope map is shown. A histographic image is displayed for data visualization.
CODE SWITCHING & CODE MIXING IN RITSUKI’S VLOG ON DIGITAL MEDIA TIKTOKː A STUDY OF SOCIOLINGUISTICS
Authors: Wardhani Dixy Putri , Yanuar Arifin
Published: February 2025

In the digital era, multilingualism is increasingly visible on social media platforms like TikTok. This study examines Code Switching and Code Mixing in multilingual communication by analyzing content from the TikTok account Mega Kenichiro Official (Ritsuki’s Vlog) through a sociolinguistic perspective. The objective is to understand how speakers use Indonesian, Japanese, and Javanese in daily interactions and its impact on digital communication. Using a qualitative approach, the study analyzed 20 selected vlogs through note-taking, focusing on intra-sentential and intra-lexical code mixing, as well as inter-sentential code switching. The conversations were classified based on speakers and language patterns. The findings show that Japanese words are frequently mixed into Indonesian sentences, while code switching between Indonesian and Javanese occurs mostly in complete sentences. Additionally, the influence of these linguistic patterns extends to audience interactions, as reflected in their comments. This study concludes that multilingualism plays a significant role in shaping online discourse, making digital media a dynamic space for language interaction. Future research should explore the educational implications of code switching and code mixing in language learning.
Pedagogía en acción: del saber pedagógico a la práctica investigativa
Authors: Villacrez Oliva María Victoria
Published: February 2025

La pedagogía, entendida como disciplina y profesión, se enfrenta a desafíos incesantes que emergen de la evolución social y tecnológica. Ante este panorama, el libro Pedagogía en acción: del saber pedagógico a la práctica investigativa responde a la imperiosa necesidad de unir substancialmente el pensamiento y la acción pedagógica, con el fin de resignificar el ejercicio del educador en la contemporaneidad. Este texto es fruto de la investigación científica De la teoría a la práctica pedagógica investigativa: un análisis evaluativo y de actualización del ejercicio docente, que se propone profundizar en las dinámicas y desafíos actuales que enfrenta la educación.

El problema principal de la investigación referida plantea la necesidad de actualizar y evaluar el proceso de prácticas pedagógicas investigativas llevadas a cabo por los estudiantes de pregrado en educación de la Universidad César Vallejo de Perú y la Universidad Mariana de Colombia. La cuestión central reside en las deficiencias observadas en la formación de maestros, dificultando así su capacidad para enfrentar los desafíos contemporáneos en la práctica pedagógica, tanto en entornos presenciales como virtuales. También se resalta la falta de preparación en innovación pedagógica y en el manejo de estudiantes inclusivos. Además, el contexto de la pandemia ha develado nuevas dificultades que necesitan ser abordadas.
INSTAGRAM CONTENT MARKETING ANALYSIS IN INCREASING UMRAH INTEREST (STUDY ON JANNAH TRAVEL ACCOUNT)
Authors: Sieradianto Dinda Ayu , Ardiansyah Angga , Muttaqin Rahmat Bahaul
Published: February 2025

One marketing strategy adopted by umrah travel companies is using content on the Instagram platform. This is in response to the increasing business competition in the umrah industry, where the growing number of umrah agencies adds complexity to the market. The success of companies in winning this competition heavily relies on their ability to reach and influence the public widely through effective information dissemination. The theory used in this research is the theory of the 4 Pillars of Social Media Strategy. Data collection techniques through observation and documentation studies involve systematic and planned recording of events or phenomena. The type of observation applied in this research is non-participatory observation, which means it does not involve direct participation. Data collection techniques through documentation studies. The conclusion drawn is that the information and education content posted by the Instagram account @JannahTravel perform well, marked by a large number of likes. This practically implies as an evaluation tool and advice in creating content plans, by increasing the proportion of information and education content to enhance the interest of potential umrah pilgrims who are the audience.
Structural analysis and experimental study of oil emulsion separation processes involving reagents
Authors:   Institute of Catalysis and Inorganic Chemistry of the National Academy of Sciences of Azerbaijan, Kelbaliev G.I. , Rasulov S.R. ,   Azerbaijan State University of Oil and Industry, Manafov M.R. ,   Institute of Catalysis and Inorganic Chemistry of the National Academy of Sciences of Azerbaijan, Shykhyeva F.R. ,   Institute of Catalysis and Inorganic Chemistry of the National Academy of Sciences of Azerbaijan
Published: February 2025

This study presents a structural analysis of the physical phenomena involved in the processes of oil emulsion separation. Various aspects of adsorption layer formation on droplet surfaces by asphaltene-resin compounds are discussed, along with models for calculating the mass and thickness of the layer. It is demonstrated that the formation of adsorption films on the surface of water droplets provides a significant resistance to their merging at collision, resulting in aggregatively stable emulsions. Emulsion separation occurs in subsequent stages following the destruction of these films using various reagents. The mechanism of adsorption film destruction involves the diffusive transfer of demulsifiers to the film surface, followed by their adsorption and penetration into the film's volume. Equations describing coalescence during the collision of a high-viscosity droplet with an ordinary one are proposed, and expressions for calculating droplet collision frequency are derived. Experimental studies on oil emulsion separation processes have been conducted. It is established that in the experimental study many physical phenomena (convective diffusion transfer, formation of intermediate layer, etc.) can be neglected, which significantly simplifies the description of the process. The description of the experimental process in the form of a model is based on the equations of convective diffusion transfer of water mass from the bulk of oil as a function of demulsifier flow rate and temperature. Comparison curves of experimental and calculated values are given to validate the model.