bluuebunny/crossref_metadata_2025 huggingface dataset:
ANALISIS FLY ASH TIPE C SEBAGAI ADITIF TERHADAP KUAT TEKAN BETON MENGGUNAKAN AGREGAT HALUS SAMBOJA
Authors: Jamal Mardewi , Tamrin Tamrin , Sutanto Tan Dicky Dwi , Gusty Sri
Published: February 2024

Tujuan penelitian yakni menganalisis pemanfaatan fly ash tipe C yang berfungsi aditif untuk meningkatkan mutu beton menggunakan agregat halus samboja dan meningkatkan kuat tekan beton normal. Metode penelitian ini merujuk pada SNI-03-2834-2000 serta dilakukan uji kuat tekan beton menggunakan benda uji silinder berdiameter 15 dan 30 cm, umur 28 hari serta kuat rencana 20,75 MPa. Adapun variasi yang digunakan 0%, 10%, 15%, 20%, 25% hingga 30% Fly Ash terhadap berat semen. Hasil penelitian menunjukan nilai kuat tekan beton secara berurutan sebesar 26,24 MPa; 28,72 MPa; 29,38 MPa; 30,88 MPa; 29,72 MPa dan 28,31 MPa, dan dari hasil tersebut terlihat nilai kuat tekan paling tinggi didapatkan pada variasi fly ash 20% dengan nilai kuat tekan 30,88 MPa. Adapun kenaikan persentasi kuat tekannya secara berurutan adalah 9,45%; 11.96%; 17.68%; 13.26% dan 7.89%, juga dapat dilihat bahwa beton dengan variasi konsentrasi fly ash dapat meningkatkan kuat tekan hingga 17,68% dari beton normal pada variasi 20%. Dari penelitian ini dapat disimpulkan penggunaan fly ash berperan secara efektif sebagai aditif mineral sehingga dapat memaksimalkan kuat tekan beton secara signifikan dan meningkatkan mutu beton yang menggunakan agregat halus samboja dan juga penelitian ini memberikan wawasan mengenai peran bahan aditif khususnya fly ash dalam meningkatkan kualitas beton.
PREDIKSI KURS RUPIAH TERHADAP EURO DAN POUND MENGGUNAKAN ARIMA
Authors: Vean Alfriando C , Witanti Arita
Published: February 2024

Euro (EUR) dan Pound (GBP) adalah dua mata uang utama di Benua Eropa dan merupakan dua dari tiga mata uang yang paling banyak dipasangkan dengan Dolar Amerika di pasar mata uang dunia, sehingga memegang peranan penting terhadap perekonomian dunia. Penelitian ini akan fokus dalam memprediksi nilai tukar Rupiah (IDR) terhadap Euro dan Pound.  Metode yang digunakan adalah Autoregressive Integrated Moving Average (ARIMA) yang cocok untuk memprediksi data berbentuk deret waktu. Data yang digunakan adalah data historis EUR-IDR dan GBP-IDR selama hari kerja dari 23 September 2013 sampai 22 September 2023 yang berjumlah 2610 data. Model terbaik yang diperoleh adalah ARIMA (1,1,0) untuk EUR-IDR dengan Akaike’s Information Criterion (AIC) sebesar 31095,33 dan ARIMA (1,1,1) untuk GBP-IDR dengan AIC 29229,77. Ditemukan skenario terbaik yaitu menggunakan 10% data uji untuk kedua data dengan Mean Absolute Error (MAE) sebesar 104,514 dan Root Mean Square Error (RMSE) sebesar 130,677 pada hasil prediksi EUR-IDR, sedangkan pada GBP-IDR menghasilkan MAE sebesar 123,417 dan RMSE sebesar 155,805. Hasil prediksi dari skenario terbaik menunjukkan kenaikan nilai tukar kedua mata uang, berpuncak pada hari ke-20 yang mencapai Rp.16512,38 pada nilai tukar Euro dan Rp.19056,49 pada Pound.
PERBANDINGAN DATA GEOLISTRIK DAN DATA SONDIR DALAM IDENTIFIKASI LAPISAN BAWAH PERMUKAAN DI KOTA PONTIANAK
Authors: Irfan Muhammad , Ivansyah Okto , Muhardi Muhardi
Published: February 2024

Penelitian ini bertujuan untuk membandingkan metode geolistrik dan data sondir dalam mengidentifikasi lapisan bawah permukaan di Kota Pontianak. Metode geolistrik menerapkan konfigurasi schlumberger dengan panjang bentangan masing-masing 150 m. Pengukuran dilakukan di 3 lokasi, yaitu Kecamatan Pontianak Tenggara, Pontianak Barat, dan Pontianak Utara. Hasil pengukuran resistivitas pada titik pertama, kedua, dan ketiga masing-masing adalah 1,845 Ωm – 62,35 Ωm; 0,1177 Ωm – 98,35 Ωm; dan 0,9275 Ωm - 710,9 Ωm. Hasil pengukuran tahanan konus (qc) dan tahanan gesek (fs) pada titik pertama masing-masing adalah 1,00 – 25,00 kg/cm2; 0,07 – 1,00 kg/cm2, pada titik kedua masing-masing adalah 1,00 – 12,00 kg/cm2; 0,07 – 0,53 kg/cm2, dan pada titik ketiga masing-masing adalah 1,00 – 25,00 kg/cm2; 0,20 – 1,00 kg/cm2. Perbandingan data geolistrik dan data sondir menunjukkan adanya perubahan tahanan konus dan tahanan gesek yang semakin besar terhadap kedalaman, sedangkan nilai resistivitas menunjukkan perubahan yang bervariasi, namun dengan pola perubahan yang cenderung semakin kecil. Lapisan bawah permukaan di lokasi penelitian berupa lempung dan pasir.
Endogenizing Politics – The GLOBUS World Model
Authors: Ramsauer Markus
Published: February 2024

The WORLD3 world model, which served as the basis for The Club of Rome report The Limits to Growth (1972), was criticized, among other things, for not being able to simulate social interactions. In order to remedy this shortcoming, a research group led by Karl Deutsch at the Berlin Science Center developed a far more comprehensive model between 1979 and 1988 entitled GLOBUS, which was supposed to be able to include political developments in the calculation. This article aims to explain the hopes that were attached to the creation of a further world model and the means by which attempts were made to assert its results. To this end, three genealogical lines of the model -I. as part of the world modeling community, II. as part of quantitative international relations research, III. as part of Karl Deutsch's cybernetic-political science research- will be presented. The data basis and the functioning of GLOBUS are then described. Finally, section VI is devoted to the research group's efforts to make the model "effective".
The Synergistic Effect of APE1/Ref-1 and Aspirin Enhances PEO14 Ovarian Cancer Cell Apoptosis via Parp Cleavage
Authors: Jin Hao , Lee Yu Ran , Kim Sungmin , Lee Eun-Ok , Joo Hee Kyoung , Yoo Heon Jong , Kim Cuk-Seong , Jeon Byeong Hwa
Published: February 2024

Ovarian cancer poses a significant therapeutic challenge owing to the lack of specific targets for treatment. New treatment strategies are needed to improve patient outcomes and reduce the toxicity of existing therapies. This study aimed to investigate the synergistic effects of recombi-nant human apurinic/apyrimidinic endonuclease 1/redox factor 1 (rhAPE1/Ref-1) and aspirin on PEO14 and CAOV-3 ovarian cancer cells and human umbilical vein endothelial cells (HUVECs). Specifically, this study examined the mechanisms underlying the effect of rhAPE1/Ref-1 and as-pirin on cell death and the associated pathways. Cell viability was assessed using the MTT assay, and flow cytometry analysis and caspase-3/7 activity assays were conducted to determine apop-tosis. Western blotting was performed to evaluate the cleavage of poly(ADP-ribose) polymerase (PARP). Exposure to aspirin (3 mM) for 24 h did not affect cell viability in PEO14. Co-incubation of aspirin with rhAPE1/Ref-1 in PEO14 cells led to rhAPE1/Ref-1 acetylation and intracellular hyperacetylation. Co-treatment with aspirin (3 mM) and rhAPE1/Ref-1 induced a rhAPE1/Ref-1 concentration-dependent increase in cell death, particularly in PEO14 cells, as well as apoptosis, caspase-3/7 activation, and PARP cleavage. Furthermore, this combination treatment significantly increased paclitaxel-induced PEO14 cell death. Therefore, co-administration with rhAPE1/Ref-1 and aspirin is a potential strategy for ovarian cancer treatment.
Exercise and Quality of Life in Patients Undergoing Active Breast Cancer Treatment. Comparison of Three Modalities of a 24-Week Exercise Program.
Authors: Suarez-Alcazar Pilar , Garcia-Roca Elena , Collado-Boira Eladio , Temprado-Albalat Maria Dolores , Baliño-Remiro Pablo , Muriach-Saurí Maria , Flores-Buils Raquel , Salas-Medina Pablo , Hernando-Domingo Carlos , Folch-Ayora Ana
Published: February 2024

Background: Exercise is an accepted intervention to improve the quality of life (QoL) of breast cancer patients. Exercise programs have been developed and all have shown satisfactory results in improving QoL. There is a lack of research comparing different prescription modalities. The aim of this study is to evaluate the effectiveness of physical exercise (in-person, home-based, prescription) on QoL in breast cancer patients actively undergoing treatment; Methods Quasi-experimental study with randomized assignment to three groups (in-person: guided and supervised in-person exercise program; home-based exercise: guided and supervised exercise program with streaming monitoring; recommendation: exercise recommendation). Quality of life was measured using the QLQ-C30 questionnaire. Baseline and 24-week analysis. Results: The total sample analyzed was n=80. QoL improved significantly at 24 weeks in the face-to-face and home-based exercise groups, but not in the advice group. Exercise in all modalities improved fatigue, nausea, vomiting, appetite, and constipation. QoL at 24 weeks depended on active chemotherapy, tumor type, and assigned exercise group (r2 = 0.503; p < 0.001). Conclusions: QoL in breast cancer patients undergoing active treatment improves after a 24-week exercise program, especially in face-to-face and home-based exercise. Home-based exercise, streaming-based recommendation is a viable option for exercise recommendation.
Unveiling Medication-Related Osteonecrosis of the Jaw: A Narrative Review of Etiology, Drug Holidays, and Treatment Strategies
Authors: Oh Ji-Hyeon , Kim Seong-Gon
Published: February 2024

This narrative review provides a thorough examination of medication-related osteonecrosis of the jaw (MRONJ), encompassing its etiology, the role of drug holidays, and contemporary treatment approaches. By systematically analyzing literature from 2022 to 2023, this paper synthesizes the latest findings and trends in MRONJ research. The study emphasizes the importance of a holistic understanding of MRONJ, beginning with its etiological factors, assessing the therapeutic implications of drug holidays, and evaluating the efficacy of current treatment modalities. This review aims to offer clinicians and researchers a consolidated resource, highlighting the intricacies of MRONJ management and proposing directions for future research. Through this comprehensive approach, the paper seeks to advance the understanding and treatment of MRONJ, ensuring an evidence-based, patient-centric approach in clinical practice.
Preliminary Mechanical Characteristics of Bio-Composite Materials Faux Leather Based on Orange Peel Waste
Authors: Rimantho Dino , Chaerani Laela , Sundari Anggina Sandy
Published: February 2024

Naturally-derived synthetic leather is a widely used and high-quality type of faux leather or synthetic leather. Many consumers prefer authentic leather goods due to their exceptional qualities, including high water vapor permeability and superior wearing comfort. Consequently, the exploration of artificial leather made from natural materials with exceptional qualities as an alternative to genuine leather has garnered significant interest and is now a highly studied subject. Synthetic leather, sometimes known as imitation leather, has gained popularity recently as a highly suitable alternative to genuine leather. Continuous advances in this area of research increase the range of uses for synthetic leather using natural fibers. Thus, this research aims to explore synthetic leather materials using orange peel waste, which can be applied to the fashion industry. This research applies several types of orange peel waste, such as Pomelo, Sweet orange, and Sunkist orange, to different compositions and strengthening materials, such as bandages and dacron. The resulting bio-composite materials' morphology, mechanics, and adhesive properties were evaluated following ASTM D 2209-00 and ASTM D 4533-04 standards. The results indicate that specimen 1A (Pomelo using bandage as reinforcement) has the most significant effects, with a tensile test value of approximately 472 N/cm2, an elongation of roughly 67.28 % was the highest value on sweet orange using bandage as reinforcement, and a tear resistance of around 14.28 N/cm2 for Pomelo with bandage as reinforcement. Furthermore, the test results also show that composition 2B still does not meet the standards of SNI 1294:2009 and ISO 3376 for tensile strength and ISO 3377-1 for tear strength. Additionally, statistical analysis showed no appreciable changes in the samples analyzed. Furthermore, statistical evaluations showed no significant alterations in the studied samples. The results of this experimental investigation can be explored further and used as a basic framework for the creation of bio-composites from orange peel waste for future fashion.
TFCD-Net: Target and False Alarm Collaborative Detection Network for Infrared Imagery
Authors: Cao Siying , Li Zhi , Deng Jiakun , Huang Yi'an , Peng Zhenming
Published: February 2024

Infrared small target detection (ISTD) plays a crucial role in both civilian and military applications. The detection of small targets against dense cluttered backgrounds remains a challenging task, requiring the collaboration of false alarm source elimination and target detection. Existing approaches primarily focus on modeling targets while often neglecting false alarm sources. To address this limitation, we propose a Target and False Alarm Collaborative Detection Network to leverage the information provided by false alarm sources and the background. Firstly, we introduce a False Alarm Source Estimation Block (FEB) that estimates potential interferences present in the background by extracting features on multiple scales and employing stepwise upsampling for feature fusion. Subsequently, we propose a framework that employs multiple FEBs to eliminate false alarm sources across multiple scales. Finally, a Target Segmentation Block (TSB) is introduced to accurately segment the targets to produce the final detection result. Experiments on public datasets demonstrate that, compared to other methods, our model achieves high accuracy in segmenting targets while being able to extract false alarm sources which can be used for further studies.
Plasma Treatment of the Large-Area Polymer Substrates for the Enhanced Adhesion of UV-Digital Printing
Authors: Fleischer Michal , Kelar Tučeková Zlata , Galmiz Oleksandr , Baťková Eva , Plšek Tomáš , Kolářová Tatiana , Kováčik Dušan , Kelar Jakub
Published: February 2024

UV-digital printing belongs to the commonly used method for custom large-area substrate decoration. Despite low surface energy and adhesion, transparent polymer materials, such as polymethylmethacrylate (PMMA) and polycarbonate (PC), represent an ideal substrate for such purposes. The diffuse coplanar surface barrier discharge (DCSBD) in a novel compact configuration was used for substrate activation to improve ink adhesion to the polymer surface. This industrially applicable version of DCSBD was prepared, tested, and successfully implemented for the UV-digital printing process. Furthermore, wettability and surface free energy measurement, X-ray photoelectron spectroscopy, atomic force and scanning electron microscopy evaluated the surface chemistry and morphology changes. The changes in adhesion of the surface and of ink were analyzed by a peel-force and a crosscut test, respectively. A short plasma treatment (1-5 s) enhanced the substrate's properties of PMMA and PC while providing the pre-treatment suitable for further in-line UV-digital printing. Furthermore, we did not observe damage or significant change of roughness affecting the substrate's initial transparency.
Extending a Global Climate-Population Model to Simulate Impacts on Human Well-Being
Authors: Homer Jack
Published: February 2024

An existing simplified simulation model of global climate, population, economy, and governance is extended, through statistical and other data analysis, to include several measures of human well-being and population displacement. The revised model is used to explore (in testing to the year 2060) vicious cycles and causal cascades that, some have warned, could lead to acceleration of climate change in the coming decades. Model scenario testing addresses two uncertainties, namely the strength of the effect of climate change on governance erosion, and the strength of the “heat trap” effect from physical tipping points such as ice loss and permafrost thaw. This testing indicates that a strong heat trap effect could very well accelerate climate change, but that even a strong governance erosion effect is unlikely to do so. Governance erosion would hurt human well-being but is probably not much of a climate threat per se. These results are tentative but point to the possibility of formally modeling causal cascades beyond what the larger climate models have done to date.
Current Knowledge of Enterococcal Endocarditis: A Disease Lurking in Plain Sight to Health Provider
Authors: Nappi Francesco
Published: February 2024

Enterococcus faecalis is a bacterial pathogen that can cause opportunistic infections. Studies indicate that initial biofilm formation plays a crucial regulatory role in these infections, as well as in colonising and maintaining the gastrointestinal tract as a commensal member of the microbiome of most land animals. It has long been thought that vegetation of endocarditis resulting from bacterial attachment to the endocardial endothelium requires some pre-existing tissue damage, and in animal models of experimental endocarditis, mechanical valve damage is typically induced by cardiac catheterisation preceding infection. This section reviews historical and contemporary animal model studies that demonstrate E. faecalis ability to colonise the undamaged endovascular endothelial surface directly and produce robust microcolony biofilms encapsulated within a bacterially derived extracellular matrix. This report reviews both previous and current animal model studies demonstrating the resilient capacity of E. faecalis to colonise the undamaged endovascular endothelial surface directly and produce robust microcolony biofilms encapsulated in a bacterially derived extracellular matrix. The article also considers the morphological similarities when these biofilms develop on different host sites, for example when E. faecalis colonises the gastrointestinal epithelium as a commensal member of the common vertebrate microbiome, lurking in plain sight and transmitting systemic infection. These phenotypes may enable the organism to survive as an unrecognised infection in asymptomatic subjects, providing an infectious resource for subsequent clinical process of endocarditis.
Improving Economic Efficiency of Heat Pump Integration Into Distillation Columns of Process Plants Applying Different Pressures of Evaporators and Condensers
Authors: Boldyryev Stanislav , Ilchenko Mariia , Krajačić Goran
Published: February 2024

The electrification of process industries is one of the main challenges when building a low-carbon society since they consume huge amounts of fossil fuel generating different emissions. Heat pumps are one of the instruments to perform industrial sector of carbon-neutral market players. This paper proposes an approach to improve the economic feasibility of heat pumps within the process plants. Initial energy targeting with Grand Composite Curves was used and supplemented with the detailed design of the evaporator and compressor for different condensation and evaporation pressures. The trade-off between the capital cost of the heat pump and the electricity cost was investigated and optimal configurations were selected. The case study investigates the gas fractioning unit of a polymer plant where three heat pumps were integrated into distillation columns. The results demonstrated that the heat recovery is 174 MW and requires an additional 37.9 MW of electricity to reduce hot utility by 212 MW. The selection of evaporation and condensation pressure of heat pumps allows saving of 21.5 M€/y for 7 years of plant operation.
Data Analytics-Driven Selection of Die Material in Multimaterial Co-extrusion of Ti-Mg Alloys
Authors: Fernández Daniel , Rodríguez-Prieto Alvaro , Camacho Ana María
Published: February 2024

Selection of the most suitable material is one of the key decisions to be taken at the design stage of a manufacturing process. Traditional approaches as Ashby maps based on material properties are widely used in the industry. However, in the production of multimaterial components, the criteria for the selection can include antagonistic approaches. The aim of this work is the implementation of a methodology based on the results of process simulations for several materials and classify them by applying an advanced data analytics method based on Machine Learning (ML), in this case the Support Vector Regression (SVR) and Multi-Criteria Decision Making (MCDM) methodolo-gies, in this case Multi-criteria Optimization and Compromise Solution (VIKOR) combined with Entropy weighting methods. In order to do this, a Finite Element Model (FEM) has been built to evaluate the extrusion force and the die wear in a multi-material co-extrusion process of bimetallic Ti6Al4V-AZ31B billets. After applying SVR and VIKOR combined with Entropy weighting methodologies, a comparison has been established based on the material selection and complexity of the methodology used, resulting that material chosen in both methodologies is very similar and MCDM method is easier to implement because there is no need of evaluate the error of the pre-diction model and the time for data preprocessing is less than the time needed in SVR.
Los recursos minerales y energéticos en el Ártico: una nueva frontera a explorar
Authors: Adánez Sanjuán Paula , Marino Egidio
Published: February 2024

España ha mostrado interés en el Ártico, pasando de motivaciones históricas de conquista a un enfoque científico. El cambio climático en la región ha llevado a una creciente actividad científica para prever y mitigar sus impactos. El trabajo destaca la importancia estratégica, económica y científica del Ártico, enfocándose en decisiones, gobernanza y colaboración internacional. Se aborda la complejidad legal, geopolítica y diplomática, destacando el papel del Comité Polar Español. Así mismo, se subraya la relevancia de considerar el conocimiento tradicional de las poblaciones árticas en la investigación. Se analiza la situación política de Groenlandia y se destaca la importancia de los recursos minerales y energéticos en la región, advirtiendo sobre posibles conflictos ambientales. Por último, refleja la actual vulnerabilidad de las estructuras árticas frente a cambios geopolíticos recientes, enfatizando la necesidad de restablecer la confianza para lograr relaciones internacionales sostenibles en el nuevo escenario climático del Ártico. A continuación, se hace una pequeña recopilación de lo tratado en el capítulo 6, titulado “Recursos Minerales y Energéticos y su Industria”.
Keterampilan Bertanya Siswa Kelas V pada Pembelajaran Tematik Materi IPA
Authors: Hardianty Okta Dwi , Erviana Lina , Burhanuddin Afid
Published: February 2024

Penelitian ini bertujuan untuk mendeskripsikan 1) proses elajar siswa kelas V pada pembelajaran tematik materi IPA di SD Negeri 2 jetak, 2) keterampilan bertanya siswa kelas V pada pembelajaran tematik materi IPA di SD Negeri 2 jetak. Jenis penelitian ini adalah penelitian kualitatif dengan menggunakan metode deskriptif. Subjek penelitian ini siswa kelas V SD Negeri 2 jetak. Teknik pengumpulan data, dengan cara observasi, wawancara, dan dokumentasi. Teknik analisis data menggunakan model Miles dan Huberman, yaitu reduksi data, penyajian data, dan penarikan kesimpulan. Hasil penelitian ini menunjukkan bahwa: 1) Proses belajar siswa kelas V saat pembelajaran tematik materi IPA sudah terlaksana dengan baik, sudah ada interaksi yang baik antara guru dan siswa. Pembelajaran tematik di kelas V menggunakan dua buku pelajaran, yaitu buku paket tematik dan buku LKS tematik. 2) Keterampilan bertanya siswa kelas V pada pembelajaran tematik sangat bervariasi, beberapa siswa merasa senang ketika bertanya saat pembelajaran di kelas, sebab bisa mendapatkan reward berupa nilai tambahan. Serta keterampilan bertanya guru juga ikut memancing dan memotivasi siswa untuk bertanya, sehingga mengalami peningkatan keaktifan siswa dalam bertanya. Jadi siswa yang memiliki keterampilan bertanya yang baik cenderung lebih aktif selama proses pembelajaran dan berprestasi, dibandingkan dengan siswa yang tidak memiliki keterampilan bertanya.
Plan de negocios para la creación de una empresa de servicios complementarios de limpieza en el ámbito de Lima metropolitana - Eco Cleaning
Authors:   , Garcia Gonzales Richard Alonso , Sulca Chinchay Karen Franchesca , Rios Dillerva Sandro Ytalo , Cordova Medina Juan Jose
Published: February 2024

La limpieza es un factor fundamental en la vida diaria de las personas, esta nos ayuda a eliminar a los agentes patógenos y reducir la concentración de contaminantes, por ello se considera que la limpieza es un componente indispensable de cualquier método de desinfección. Es por ello la razón de nuestro proyecto de negocio de limpieza Eco Cleaning SAC consiste en brindar un servicio impecable de limpieza, mantenimiento y desinfección de alta calidad para hogares, espacios y oficinas que contribuyen a la prevención de enfermedades o plagas. Eco Cleaning; es un proyecto que nace a través de una necesidad de contratar una empresa dedicada a los servicios complementarios de limpieza en la zona de Lima Metropolitana, al ser una empresa usuaria estamos a disposición de otras empresas, nos encargamos de distribuir personal con el fin de proporcionar el servicio de limpieza según la demanda del cliente.
Motivación y el compromiso laboral en las Mypes del C.C. Fevacel del distrito Independencia-2022
Authors:   , Encarnacion Arias Della Paola
Published: February 2024

La tesis estableció como objetivo estipular el grado de correlación existente entre las dos variables: la motivación y el compromiso de personas colaboradoras de las MYPES del C.C. FEVACEL del Distrito Independencia-2022. La investigación es bajo un enfoque cuantitativo, tipo descriptivo-correlacional y diseño no experimental, para la obtención de información respecto a la utilización se empleó la encuesta, referido instrumento a usar fue un cuestionario, el cual contuvo un total de 32 preguntas, 18 de la primera variable, motivación, y 16 de la segunda, compromiso, la cual se presentó en escala Likert para facilitar la obtención de resultados, los cuales se trabajarán con la medida de dependencia no paramétrica denominada Correlación Spearman. La muestra fue de 292 trabajadores del distrito mencionado, obteniendo como resultado un 0.458. Por lo tanto, se llega a concluir la existencia de una relación positiva moderada respecto a la motivación y el compromiso laboral.
Clima laboral y rotación de personal en el área de telemarketing de una entidad financiera, distrito del Cercado de Lima (Perú), 2022
Authors:   , Pacherrez Allcca Karen Lisbet , Vargas Casanova Liseth Francisca
Published: February 2024

Esta investigación tuvo por objetivo determinar la relación entre el clima laboral y la rotación del personal en el Área de Telemarketing de una entidad financiera ubicada en el distrito del Cercado de Lima (Perú) durante el 2022. En este estudio, se empleó una metodología de enfoque cuantitativo, implementando un diseño no experimental transeccional correlacional. La muestra seleccionada fue no probabilística por juicio, utilizando la técnica de la encuesta como medio de recolección de datos, donde el instrumento utilizado fue el cuestionario. Los resultados obtenidos demostraron la corroboración de la hipótesis alterna, lo que implica la existencia de una relación significativa entre las variables estudiadas; esto se confirmó mediante un coeficiente Rho de Spearman de -0.933. Finalmente, se concluyó que existió una relación inversa, fuerte y significativa entre el clima laboral y la rotación de personal en el Área de Telemarketing de la entidad financiera objeto de estudio. Similarmente, existió una relación inversa entre la rotación del personal y las dimensiones del clima laboral: motivación, tolerancia al error y liderazgo.
Comparación in vitro de la microdureza superficial de dos resinas compuestas sumergidas en una bebida alcohólica destilada de uva (Pisco)
Authors:   , Armstrong Yzu Mattias
Published: February 2024

Objetivo: El objetivo de este estudio in vitro fue comparar la microdureza superficial de una resina compuesta nanohíbrida y una resina compuesta nanoparticulada luego de ser sumergidas en una bebida alcohólica destilada de uva (pisco). Materiales y métodos: Sesenta discos de resinas compuestas (RC), 30 de RC nanohídridas de Tetric® N- Ceram (Ivoclar-Vivadent) y 30 de RC nanoparticulada Filtek™ Z 350XT (3M-Espe) fueron evaluadas en microdureza de Vickers (VHM) en Kg/mm2 superficial inicial (a las 24 horas) y final (a los 30 días) luego de ser sometidas a dos soluciones (n=15 c/u) de suero fisiológico y pisco Portón de Ica-Perú (pH=3,4; 10 ml; 15 min; 3 veces al día). Los resultados fueron analizados con la prueba T de student de muestras dependientes (tiempo) e independientes (tipo de RC y solución) mediante el software SPSS v.25. Resultados: Los valores iniciales y finales promedio de VHM fueron inferiores en Tetric (34,09 a 42,79) que en Filtek (61,73 a 70,91) en ambos grupos de soluciones. El VHM en ambas RC y soluciones aminoraron significativamente a los 30 días (P≤0,001). La variación de VHM a los 30 días en el pisco con Tetric (8,59 ± 0,46) y Filtek (9,17 ± 0,51) fue significativamente mayor que en suero tanto en Tetric (0,71 ± 0,17) como en Filtek (1,50 ± 0,29) (P=0,001). Asimismo, la variación fue superior en Filtek que en Tetric en ambas soluciones (P≤0,001). Conclusiones: El pisco afectó la VHM superficial de ambas RC a los 30 días, aminorando más el VHM de las RC nanoparticuladas que las nanohíbridas.
Prevalencia de rayado blanco y pechuga de madera: revisión sistemática y metaanálisis
Authors:   , Bustios Santa Gadea Martin Sebastian
Published: February 2024

El crecimiento acelerado de los pollos de engorde asociado a diferentes factores puede conllevar a miopatías. El objetivo del estudio fue revisar y analizar toda la información relacionada a la incidencia y prevalencia de rayado blanco (RB) y pechuga de madera (PM) en los pollos de engorde a través de una revisión sistemática y metaanálisis en base a la literatura actual. Para ello se seleccionaron diferentes estudios acordes a criterios de inclusión y exclusión para la realización de una revisión sistemática y consecuentemente un metaanálisis con la finalidad de obtener un promedio del valor de prevalencia. Los estudios evaluados correspondían a estudios en pollos in-vivo teniendo una población 125722 pollos, considerando ambos sexos, línea genética destinada al engorde, etapa productiva completa de 1 a 42 días de edad y aves criadas bajo condiciones comerciales. Se utilizó el software Meta Essentials, el cual permitió realizar los cálculos. La heterogeneidad se analizó mediante el estadístico Q de Cochrane e I2 de Higgins. La distribución de homogeneidad a través del gráfico de embudo (Funnel Plot). El sesgo de las publicaciones mediante el estadístico de Egger con un nivel de significancia de 0.05 y la ponderación de los artículos mediante el gráfico de bosque (Forest plot). La prevalencia encontrada para RB fue de 62% y para PM fue 42%.
Tensión compresiva en tres tipos de líneas de terminación en un diente permanente con corona de disilicato de litio: análisis de elemento finito
Authors:   , Yanapa Marquez Joshua Claudio Andre
Published: February 2024

Introducción: En rehabilitación oral es ampliamente aceptado el uso de restauraciones cerámicas por su capacidad estética para mimetizar la naturalidad del tejido dentario, brindar longevidad del material y presentar un mayor ajuste marginal en comparación a coronas con estructura metálica. Las líneas de terminación son preparaciones biológicas cuya función es minimizar la abertura cervical del sellado marginal. En consecuencia, analizar el comportamiento de materiales restauradores bajo fuerzas compresivas, disminuye el riesgo de fractura y aumentan el éxito del tratamiento. Objetivo: Comparar las tensiones compresivas de las coronas de disilicato de litio con tres distintas líneas de terminación. Metodología: Estudio in silico de la simulación de una preparación dental sobre una primer molar inferior derecha con líneas de terminación tipo chamfer (0,6 mm), hombro (0,5 mm) y chamfer profundo (0,5 mm). Mediante el software SolidWorks®️ versión 2017 se recolectaron las tensiones máximas, tensiones mínimas y localización de la fuerza compresiva en la escala de medición Megapascales (Mpa). Resultados: La línea de terminación tipo chamfer (0.6mm) obtuvo una tensión compresiva menor en comparación de las otras dos líneas de terminación tipo hombro (0,5 mm) y chamfer profundo (0,5 mm). Conclusiones: Se demostró que la línea de terminación tipo chamfer (0.6mm) presentó una mejor distribución de fuerza, determinando una confiabilidad mayor en la selección de esta línea de terminación con el uso de una corona de disilicato de litio de manera unitaria.
A Missing Well-Logs Imputation Method Based on Conditional Denoising Diffusion Probabilistic Models
Authors: Meng Han , Lin Botao , Zhang Ruxin , Jin Yan
Published: February 2024

Well logs comprise sequential data detailing the geological properties of formations at varying depths encountered during drilling. They are fundamental for various applications in the petroleum industry. However, acquired well logs often contain noise and missing data, which impedes their utility. To address this, numerous methods have been developed to impute missing components in well logs, ranging from traditional deterministic methods to modern data-driven models. Despite their effectiveness, these methods face several challenges. First, many are deterministic, lacking the ability to capture and represent the inherent uncertainties in the data. In addition, they often require complete logging data as input, which presents challenges in data sets with substantial missing data. Moreover, most are predictive models designed with specific targets that require retraining for different variables, which limits their versatility in handling data sets with diverse missing components. This work proposes the use of a generative model based on the conditional denoising diffusion probabilistic model (CDDPM) to impute missing components within well logs. The CDDPM offers several advantages. Its inherent probabilistic nature allows it to capture uncertainties in the data, providing predictions in the form of probability distributions rather than single-point estimates. This helps engineers make more robust and informed decisions in practice, thus mitigating potential risks. More importantly, due to its generative nature, the model is trained to learn the underlying data distribution, not the specific input-output map, which enables it to impute all missing data simultaneously. Through experiments on a real-world data set, we demonstrate that our proposed method surpasses conventional data-driven techniques in performance. Both qualitative and quantitative evaluations confirm the effectiveness of the model in imputing missing components. This research highlights the potential of modern deep generative models in petroleum engineering applications.
Experimental Study on Forced Imbibition and Wettability Alteration of Active Carbonated Water in Low-Permeability Sandstone Reservoir
Authors: Li Songyan , Du Kexin , Wei Yaohui , Li Minghe , Wang Zhoujie
Published: February 2024

Imbibition is one of the main mechanisms for fluid transport in porous media. A combination of carbonated water and active water [active-carbonated water (ACW)] has great prospects in enhanced oil recovery (EOR) and carbon reduction processes. To date, the law of hydrocarbon recovery induced by ACW imbibition is not clear. In this paper, the optimal surfactant concentration was first selected through a spontaneous imbibition experiment, and on this basis, CO2 was dissolved to form ACW. The imbibition effects of formation water (FW), surfactant solution DX-1, and ACW under different pressures were compared. The changes in rock wettability in the three imbibition solutions during imbibition were studied by measuring the contact angle. The effect of fracture on ACW imbibition was studied. Finally, the improved NB−1 was calculated to elucidate the mechanism of forced imbibition for EOR. The results show that 0.1% DX-1 produces the optimal imbibition effect. Pressure is positively correlated with imbibition recovery. ACW can significantly improve the imbibition effect due to its wettability reversal ability being better than those of FW and DX-1. CO2 in ACW can be trapped in the formation through diffusion into small rock pores. The contact angles of the three imbibition solutions decrease with increasing pressure. The contact angle between the rock and oil droplet in the ACW is as low as 38.13°. In addition, the fracture increases the contact area between the matrix and the fluid, thereby improving the imbibition effect. The alteration of NB−1 indicates that FW imbibition is gravity-driven cocurrent imbibition. DX-1 and ACW imbibitions are countercurrent imbibitions driven by capillary force and gravity. The above results demonstrate the feasibility of ACW in low-permeability reservoir development and carbon reduction.
Propagation of Combustion Front within Fractured Shale and Its Influence on Shale Structure and Crude Oil Properties: An Experimental Study
Authors: Zhao Shuai , Pu Wanfen , Chen Qingyuan , Yuan Chengdong , Varfolomeev Mikhail A.
Published: February 2024

The in-situ combustion (ISC) technique has emerged as a significant approach for shale oil production. However, currently, there is a lack of experimental evidence supporting the stable propagation of combustion front within fractured shale. This study aimed to investigate the combustion characteristics within fractured shale by using a self-designed combustion tube (CT) and an experimental scheme. Subsequently, an analysis of shale structure and oil properties was conducted. The results demonstrated that while the combustion front could propagate through shale with a single fracture width of approximately 43 μm, the combustion intensity gradually diminished, leading to an inability to sustain stable propagation in the later part of the oil-detritus mixtures. The combustion intensity within the shale was enhanced by preheating the shale at 250°C, resulting in an improved oil recovery from 67.8% to 77.9%. The findings indicated that the complex fractured shale allowed for the stable propagation of the combustion front without a significant decrease in combustion intensity. Moreover, the T2 spectrum analysis of shale revealed a gradual expansion of the pore-fracture structure and improved shale connectivity after combustion. The T1-T2 response illustrated the transformation of solid and heavy components into lighter components. Furthermore, the content of saturates and H in the oil increased after combustion, whereas there was a significant decrease in resins, O, and S. Overall, this study provided technical evidence supporting the feasibility of employing the ISC technique for the development of shale oil reservoirs with additional fractures.
Prevalence and factors associated with Iron deficiency anaemia among children aged 6-23 months in southwestern Uganda.
Authors: Dickson kajoba , Egesa Walufu Ivan , Muyombya Solomon , Ortiz Yamile Arias , Nduwimana Martin , Ndeezi Grace
Published: February 2024

Iron deficiency anemia is still a global public health concern with the highest burden among children 6 to 23 months due to their rapid growth spurt exceeding breastmilk supply. Therefore, nutritional supply is a key source of iron to attain the required nutrients for better growth and development.
This was a cross-sectional descriptive study done at Ishaka Adventist Hospital (IAH) and Kampala International University Teaching Hospital (KIUTH) from April to July 2022. Participants were consecutively enrolled in the study. Structured questionnaires, 24-hour dietary recall, and clinical assessment were used to obtain data. Data analysis was done using the Statistical Package for Social scientists (SPSS) V22.0. Bivariable and multivariable analysis was done using logistic regression for associations with significance set at P-value <0.05.
A total of 364 participants were enrolled, with majority males 198(54.4%) and born at term 333(91.5%). The modal age was 12-17 months [163(44.8%)] with a mean age of 14.1 months (SD 5.32). The overall prevalence of IDA was 151/364 (41.5%). The factors associated with IDA included male sex (aOR 1.61), current episode of diarrhoea (aOR 1.71), poor meal frequency (aOR 1.78), no vegetable consumption (aOR 2.47) and consuming fruits once (aOR 1.97) in 7 days preceding the study.
The study finds a high prevalence of IDA among infants 6-23 months with at least four in 10 being affected. Screening for IDA should be recommended in male children with current diarrhea, poor intake of fruits and vegetables, and poor meal frequency. The Mentzer index is an equally good alternative screening test for IDA.
Plasma-derived exosomal miR-184 and miR-6766-3p as promising diagnostic biomarkers for early detection of children’s cardiac surgery-associated acute kidney injury
Authors: Liu Pengtao , Bai Kaiping , Yuan Fei , Gao Wei , Zou Xiangyu , Sun Jie
Published: February 2024

Background: There is little known about the contribution of exosomal microRNAs (miRNAs) in the children’s cardiac surgery-associated acute kidney injury (CSA-AKI). This study aimed to find diagnostic biomarkers for predicting CSA-AKI in children.
Methods: A prospective observational study was conducted from April 2020 to March 2021.According to the changes of SCR value and urine volume within 48 hours, the children were divided into AKI group and non-AKI group. Serum samples were collected 4 hours after cardiac surgery. Isolation of EVs and extraction of exomiRs from serum samples.Illumina high-throughput sequencing was used to quantify exomiRs and screen candidate miRNAs. Expression levels of candidate miRNAs were validated using droplet digital polymerase chain reaction (ddPCR) . Normal and injuried rats’ kidney tissue were collected for tissue validation.
Result: In the pre-experimental stage (4 AKI vs 4 non-AKI), miR-184, miR-4800-3p, miR-203a-3p and miR-6766-3p were selected as candidate genes.In the verification stage (8 AKI vs 12 non-AKI), the expression of miR-184 in AKI group was significantly lower than that in non-AKI group (paired 0.031), and the expression of miR-4800-3p and miR-6766-3p in AKI group was significantly higher than that in non-AKI group (paired 0.01and paired 0.047).There was no significant difference in the expression of miR-203a-3p between the two groups (P > 0.05). The expression of rats’ kidney tissue miR-184 in AKI group was significantly lower than that in the normal group (P=0.044). The area under the curve (AUC) of AKI predicted by miR-184 is 0.7865 and the AUC of miR-6766-3p is 0.7708.Combined with two kinds of miRNA, the area under the curve of AKI is predicted to be 0.8646.
Conclusion: The change of exomiRs level in circulatory system occurred in the early stage after cardiac operation, and the changes of miR-184 and miR-6766-3p content in circulatory system could predict CSA-AKI well.
Establishment of a predictive nomogram for breast cancer lympho-vascular invasion based on radiomics obtained from digital breast tomography and clinical imaging features
Authors: liang Gang , Zhang Suxin , Zheng Yiquan , Chen Wenqing , Liang Yuan , Dong Yumeng , Lizhen L I , Li Jianding , Yang Caixian , Jiang Zengyu , He Sheng
Published: February 2024

Background
To develop a predictive nomogram for breast cancer lympho-vascular invasion (LVI), based on digital breast tomography (DBT) data obtained from intra- and peri-tumoral regions.
Methods
192 breast cancer patients were enrolled in this retrospective study from 2 institutions, in which Institution 1 served as the basis for training (n = 113) and testing (n = 49) sets, while Institution 2 served as the external validation set (n = 30). Tumor regions of interest (ROI) were manually-delineated on DBT images, in which peri-tumoral ROI was defined as 1 mm around intra-tumoral ROI. Radiomics features were extracted, and logistic regression was used to construct intra-, peri-, and intra-+peri-tumoral “omics” models. Patient clinical data was analyzed by both uni- and multi-variable logistic regression analyses to identify independent risk factors for the clinical imaging model, and the combination of both the most optimal “omics” and clinical imaging models comprised the comprehensive model. The best-performing model out of the 3 types (“omics”, clinical imaging, comprehensive) was identified using receiver operating characteristic (ROC) curve analysis, and used to construct the predictive nomogram.
Results
The most optimal “omics” was the intra-+peri-tumoral model, and 3 independent risk factors for LVI, maximum tumor diameter (odds ratio [OR] = 1.486, 95% confidence interval [CI] = 1.082–2.041, P = 0.014), suspicious malignant calcifications (OR = 2.898, 95% CI = 1.232–6.815, P = 0.015), and axillary lymph node (ALN) metastasis (OR = 3.615, 95% CI = 1.642–7.962, P < 0.001) were identified by the clinical imaging model. Furthermore, the comprehensive model was the most accurate in predicting LVI occurrence, with areas under the curve (AUCs) of 0.889, 0.916, and 0.862, for, respectively, the training, testing and external validation sets, compared to “omics” (0.858, 0.849, 0.844) and clinical imaging (0.743, 0.759, 0.732). The resulting nomogram, incorporating radiomics from the intra-+peri-tumoral model, as well as maximum tumor diameter, suspicious malignant calcifications, and ALN metastasis, had great correspondence with actual LVI diagnoses under the calibration curve, and was of high clinical utility under decision curve analysis.
Conclusion
The predictive nomogram, derived from both radiomics and clinical imaging features, was highly accurate in identifying future LVI occurrence in breast cancer, demonstrating its potential as an assistive tool for clinicians to devise individualized treatment regimes.
Co-seismic and rainfall triggered landslide hazard susceptibility framework for Uganda derived using fuzzy logic and geospatial modelling techniques
Authors: Oleng Morris , Ozdemir Zuhal , Pilakoutas Kypros
Published: February 2024

Over the past few decades, Uganda has suffered from many damaging landslides like the 2010 Bududa, 1994 Kisomoro and 1966 Rwenzori events. Although most slope failures are rainfall-induced, earthquakes can also trigger larger scale landslides. Despite escalating landslide risk exacerbated by rapid population growth and urbanization coupled with a substandard building stock, comprehensive national co-seismic and rainfall-induced landslide hazard and risk maps for Uganda do not exist. This study aims to develop a co-seismic landslide hazard susceptibility framework using a geospatial-based fuzzy logic methodology. Initially landslide conditioning factor maps are created, aggregated with a stochastic event-based probabilistic seismic hazard model developed using OpenQuake-engine, and their spatial distribution is overlaid to produce final fuzzy sets describing relative probabilities of co-seismic landslide hazard. Seismic hazard map for a 475-year return period shows maximum bedrock peak ground acceleration increasing to 0.27 g in western Uganda. Further results show that areas of Precambrian granites located in upper slopes with gradients between 35 and 40o have the highest landslide frequency ratios. Whilst the majority of the country is exposed to relatively low hazard, the Rwenzori and Kigezi regions are highly susceptible to co-seismic landslides. To reduce the earthquake and landslide risks across Uganda, it is recommended that the directorate of disaster preparedness and management should develop suitable disaster risk mitigation measures like: local planning and zoning, structural retrofitting and infrastructure protection for key public buildings, natural system protection, and education towards raising community awareness.