bluuebunny/crossref_metadata_2025 huggingface dataset:
Investigación sobre estrategias para reducir los tiempos de ciclo en procesos de estampado.
Authors: Alcívar Veliz Daniel Alexander , Mera Mendoza Andrés Mauricio , Bustamante Sánchez Santiago Isaac
Published: February 2024

En el presente artículo se realiza un análisis para la reducción de tiempos en el proceso de estampado, y de esta manera de acuerdo a una investigación bibliográfica se puede formular una estrategia que pueda cumplir de forma adecuada los objetivos planteados en la presente investigación y mejorar los tiempos de producción. La industria actual presenta una gran necesidad de mejorar sus tiempos de producción para mejorar su competitividad y la utilidad que se reciba por los trabajos realizados. En primer lugar, se describe el fundamento teórico que fundamenta las bases de la presente investigación, de esta manera se explica que es una matriz de estampado, sus partes componentes y aplicaciones industriales. Como se describe anteriormente sobre el proceso de estampado, con la ayuda de la matriz se puede obtener el resultado de estampado metálico, juega un papel crucial en la industria metal mecánica esta permite la producción en masa de componentes metálicos complejos con alta precisión y eficiencia. Todo esto con la finalidad de poder llegar a la parte final con una buena aceptación de los resultado y discusiones que es aquí donde vamos a detallar sobre el tipo de matriz más eficiente sobre factores a tomar en cuenta para poder tener una reducción de tiempo.
Synergistic effect of Erythrina variegata L. and tamoxifen against the growth of breast cancer cells
Authors: Tran Van Thi Hong , Hoang Thi Van Anh , Lai Viet Hung , Do Thi Hong Khanh , Pham Duc Vinh
Published: February 2024

Breast cancer is the most common malignancy and the second leading cause of death in women. While tamoxifen (TAM) remains to be a first-line agent for prevention and treatment of estrogen-receptor (ER) positive breast tumors, TAM resistance represents one of the biggest clinical challenges in breast cancer therapy. Therefore, there has been growing interest in the identification of novel agents including those of plant origin that enhance the TAM sensitivity of breast cancer cells. In the present study, we aimed to evaluate the synergistic effect of Erythrina variegata extract (EVE) and TAM on the suppression of breast cancer cell growth using MCF-7 cell model and conventional bioassays such as MTT and colony formation assay, cell cycle analysis, and immunocytochemistry. Interestingly, MTT assay in combination with Chou-Talalay analysis demonstrated the potent synergism between EVE and tamoxifen against MCF-7 cell survival. Additionally, co-treatment of MCF-7 cells with EVE and TAM more significantly suppressed colony formation, cell cycle progression, and the nuclear expression of proliferative marker Ki67 compared to TAM alone. These findings imply that EVE potentiates the anti-proliferative effect of TAM in MCF-7 breast cancer cells and may become a promising agent in the treatment of ER positive breast cancer.
Pengaruh Lama Waktu Biofermentasi Chromolaena Odorata Dengan Sumber Karbon Tepung Putak Terhadap Kandungan Energi
Authors: Penuam Rispa Ofenci Nope , Lestari Gusti Ayu Y. , Dami Dato Twen O
Published: February 2024

Tujuan penelitian ini adalah untuk mengetahui pengaruh lama waktu biofermentasi (Chromolaena odotara ) dengan sumber karbon tepung putak terhadap kandungan energi. Metode yang digunakan dalam penelitian ini adalah metode rancangan acak lengkap (RAL) yang terdiri atas 4 perlakuan dan 4 ulangan. Perlakuan yang di terapkan yaitu: LBf21: lama biofermentasi21 hari (sebagai kontrol), LBf14: lama biofermentasi, LBf7: lama fermentasi dan LBf0: lama biofermentasi. Variabel yang diteliti adalah kandungan energi Karbohidrat (CHO), Bahan ekstrat tanpa nitrogen (BETN), Groos energy (GE), Metabolisme energy (ME), Total digestilde nutrient (TDN). silase semak bunga putih dengan sumber karbon tepung putak. Data yang diperoleh dianalisis menggunakan analisis sidik ragam (ANOVA). Hasil analisis statistik menunjukkan bahwa pengaruh lama waktu penambahan tepung putak sebagai sumber karbon berpengaruh tidak nyata (P>0,05) terhadap kandungan energi dengan lama waktu biofermentasi yang berbeda. Disimpulkan bahwa lama biofermentasi Chromolaena odorata dengan sumber karbon tepung putaktidak mempengaruhi kandungan energi.
The Contribution of Both Personal Traits and Emotional Intelligence in Predicting Academic Procrastination Patterns Among a Sample of Female Students at King Abdulaziz University in Jeddah
Authors: Al Otaibi Kholoud , Thabet Mohammed
Published: February 2024

The study aimed to investigate the impact of personality traits and emotional intelligence on predicting academic procrastination patterns among a sample of female students at King Abdulaziz University in Jeddah. The researcher employed a descriptive correlational methodology to achieve the study objectives. The study sample consisted of 250 female students from various scientific, administrative, humanitarian, and health disciplines at King Abdulaziz University, selected randomly. The researcher utilized Abu Qouidar's (2022) Personality Traits Scale, Ben Amr's (2017) Emotional Intelligence Scale, and Faisal and Saleh's (2018) Academic Procrastination Patterns Scale in the study. The results revealed the most prevalent personality traits among the study sample, with the trait of agreeableness emerging as the most common. The findings also indicated a high level of emotional intelligence among the students. The most common academic procrastination pattern among the study sample was perfectionist procrastination. The results further demonstrated a correlation between personality traits and emotional intelligence. However, no significant correlation was found between personality traits and academic procrastination patterns, except for agreeableness, which exhibited a positive correlation with procrastination patterns. Dedication, on the other hand, showed a negative correlation with academic procrastination patterns. The remaining dimensions of personality traits were not correlated with academic procrastination patterns. Additionally, the results showed an inverse relationship between emotional intelligence and academic procrastination patterns. The findings suggested that certain personality traits (agreeableness, dedication) and emotional intelligence significantly contribute to predicting academic procrastination patterns among female students at King Abdulaziz University in Jeddah.
Streamlining Regulatory Reporting in US Banking: A Deep Dive into AI/ML Solutions
Authors: Prakash Sanjeev , Venkatasubbu Selvakumar , Konidena Bhargav Kumar
Published: February 2024

This paper presents an in-depth examination of the application of Artificial Intelligence (AI) and Machine Learning (ML) solutions to streamline regulatory reporting processes within the United States banking sector. With increasing regulatory complexity and reporting requirements, banks are under pressure to enhance efficiency while ensuring compliance. Through a comprehensive analysis of existing literature and case studies, this study explores the potential of AI/ML technologies to automate and optimize regulatory reporting tasks. By identifying key challenges, opportunities, and best practices, this research aims to provide insights for banks seeking to adopt AI/ML solutions in regulatory reporting, ultimately contributing to improved operational effectiveness and regulatory compliance.
Unlocking Insights: AI/ML Applications in Regulatory Reporting for US Banks
Authors: Prakash Sanjeev , Venkatasubbu Selvakumar , Konidena Bhargav Kumar
Published: February 2024

This paper explores the applications of Artificial Intelligence (AI) and Machine Learning (ML) in regulatory reporting for banks in the United States. As banks grapple with increasing regulatory requirements, AI and ML technologies offer opportunities to streamline reporting processes, improve accuracy, and unlock valuable insights from vast amounts of financial data. By leveraging AI/ML techniques, banks can enhance regulatory compliance while optimizing resource allocation and decision-making. This paper examines key AI/ML applications in regulatory reporting, discusses their benefits and challenges, and highlights the implications for banks and regulators alike.
Autopercepción de salud en una comunidad indígena en Imantag Ecuador
Authors: Navarrete Arboleda Edmundo Daniel , Noroña Salcedo Darwin Raúl , Molina Delgado José Renán
Published: February 2024

El objetivo de la investigación fue determinar el grado de influencia que ejercen las variables nominales de género, edad, escolaridad y estado civil en la autopercepción de salud de una muestra representativa de trabajadores campesinos en Imantag Ecuador. La metodología fue no experimental, transversal, descriptiva y correlacional. Se aplicó la encuesta de Autopercepción de Salud de Goldberg GH-30 a 84 campesinos agricultores, registrando también 4 preguntas socio demográficas anteriormente mencionadas. La hipótesis de investigación presumía mayor afectación por presencia de síntomas psicosomáticos, ansiedad – insomnio, disfunción social y depresión en mujeres mayores de 40 años, casados y las personas no escolarizadas o con nivel de escuela incompleta. Como principales resultados, se registraron 30 casos de percepción inadecuada de la salud. Los síntomas psicosomáticos fueron las dimensiones más afectadas con el 42,8% seguida de ansiedad – insomnio 35,7%, disfunción social 14,3% y depresión con 7,1%. Se comprueba 5 inferencias estadísticas entre género y estado civil con ansiedad, síntomas psicosomáticos y presencia de caso. Las mujeres presentan OR=3 en referencia a sufrir ansiedad, y los casados registran OR=14 con bajas percepciones de salud. Se concluye que las mujeres y las personas casadas presentan más probabilidades de afectaciones en la esfera social, en salud física y en ansiedad/ insomnio.
Liderando desde el comportamiento institucional: una intervención socioeducativa
Authors: Henao Martínez Freddy Enrique , Moronta Padrón Nereida , Muñoz Villalobos Alcides
Published: February 2024

En la sociedad contemporánea, el liderazgo en las instituciones educativas desempeña un papel crucial en el desarrollo y la calidad de la educación. El comportamiento institucional, incluyendo las prácticas administrativas, la cultura organizativa y la toma de decisiones, tiene un impacto significativo en la efectividad de las instituciones educativas. El propósito de este estudio fue ver el liderazgo y el comportamiento de la organización: trabajo socioeducativo. Se centra en las posiciones de liderazgo de los líderes educativos. Esto requiere de un conjunto de experiencias y conocimientos que funcionen como herramienta para hacer frente a las múltiples situaciones que se presentan y acudir al cambio continuo de las organizaciones para lograr el desarrollo de la organización. La metodología es descriptiva, documental, y la población está constituida por las fuentes bibliográficas consultadas. Entre los hallazgos encontrados por los autores citados, señalan el vínculo entre la motivación, el comportamiento organizacional aunado a la intervención socioeducativa, representan elementos significativos en la búsqueda de mejoras significativas en la calidad de la educación y el bienestar de las comunidades.
Kualitas Pelayanan Perpanjangan SIM dalam Aplikasi Digital Korlantas Polri Melalui Fitur Layanan SIM Nasional Presisi (SINAR) di Kepolisian Resor Kota Denpasar
Authors: Nabila Irdha Az-Zahra  , I Putu Dharmanu Yudartha
Published: February 2024

Digital government transformation in bureaucracy can improve interaction between government and society, simplifying two-way communication so as to increase public efficiency. The Precision National SIM Service (SINAR) is a technological breakthrough in the industrial revolution 4.0 amidst the Covid-19 pandemic. This service is national, so that all SIM Administration Units (SATPAS) in Indonesia can implement this innovation. This research uses a qualitative approach. Using Primary and Secondary data sources. This research used a purposive sampling technique. The Driving License Administration Organizing Unit (SATPAS) plays a role in providing services to the community in terms of driving license services. The indicators contained in the theory of Public Service Quality proposed by Fitzsimmons in Zaenal Mukarom & Muhibidin (2015), namely: (1) physical evidence (tangible) (2) reliability (3) response (responsiveness) (4) guarantee (assurance) and (5) empathy (empathy) Based on the results of research regarding the quality of SIM extension services in the National Police Traffic Corps Digital application through the National Precision SIM (SINAR) service feature at the Denpasar Police Station, it is not fully running optimally, so it requires improvements in terms of service applications .

 

Abstrak

Transformasi digital government dalam birokrasi dapat meningkatkan interaksi antar pemerintah dan masyarakat, menyederhanakan komunikasi dua arah sehingga agar dapat meningkatkan efisiensi publik. Layanan SIM Nasional Presisi (SINAR) merupakan terobosan teknologi revolusi industry 4.0 ditengah pandemic Covid-19. Layanan ini bersifat nasional, sehingga seluruh Satuan Penyelenggara Administrasi SIM (SATPAS) yang ada di Indonesia dapat menerapkan inovasi iniPenelitian ini menggunakan pendekatan kualititatif. Menggunakan sumber data Primer dan Sekunder. Dalam penelitian ini menggunakan teknik purposive sampling. Satuan Penyelenggara Administrasi Surat Izin Mengemudi (SATPAS) berperan dalam pelaksanaan pemberian pelayanan kepada masyarakat dalam hal pelayanan SIM. Adapun indikator yang terdapat dalam teori Kualitas Pelayanan Publik yang dikemukakan oleh Fitzsimmons dalam Zaenal Mukarom & Muhibidin (2015), yaitu: (1) bukti fisik (tangible) (2) kehandalan (reliability) (3) tanggapan (responsiveness) (4) jaminan (assurance) serta (5) empati (empathy)Berdasarkan dari hasil penelitian terkait kualitas pelayanan perpanjangan SIM dalam aplikasi Digital Korlantas Polri melalui fitur layanan SIM Nasional Presisi (SINAR) di Polresta Denpasar belum sepenuhnya berjalan dengan optimal, sehingga membutuhkan peningkatan dari segi aplikasi layanan.

Kata Kunci: Digital Government, SATPAS, SIM Nasional Presisi, Kualitas Pelayanan
O papel do gestor escolar na mediação de conflitos: o caso da escola municipal Friedenreich
Authors: Gomes Guilherme
Published: February 2024

Este trabalho reflete sobre o papel da equipe de direção da Escola Municipal Friedenreich acerca da mediação entre os desejos de sua comunidade escolar e as orientações da Secretaria Municipal de Educação do Rio de Janeiro. Buscou-se problematizar o quanto a articulação política na escola é fonte de empoderamento dos sujeitos escolares, tendo uma relação, inclusive, com a identidade desses sujeitos. Como metodologia realizou-se, num primeiro momento, uma análise bibliográfica, com o intuito de compreender como uma instituição de ensino, gerida coletivamente, resistiu à remoção no entorno do Complexo do Maracanã - RJ, no contexto da Copa do Mundo e Olimpíadas. Inaugurada em 1965, a Escola Municipal Friedenreich está localizada na Avenida Maracanã, 350, deveria ser demolida a fim de satisfazer determinações de órgãos internacionais visando a construção de equipamentos de apoio aos megaeventos. Para abordar os conceitos de memória e identidade, optou-se por realizar consultas aos fundos documentais produzidos e acumulados sobre a escola, artigos e notícias que estavam relacionados à tentativa de demolição. Levando em consideração as múltiplas relações existentes no ambiente escolar, refletimos a importância da equipe de direção em representar sua comunidade escolar frente às imposições e interesses que prejudicavam a permanência do prédio escolar em seu local de origem.
EDUKASI LATIHAN UNTUK NYERI PUNGGUNG BAWAH PADA LANSIA DI RW 17 POSLANSIA MOJOSONGO SOLO
Authors: Wahyu Tri Setyo  , Arif Pristanto  , Charisa Anis Dwi
Published: February 2024

Reduced functional ability followed by decreased physical activity has a relationship with age and gender. men and women are at the same risk, ranging from reduced muscle strength to endurance. One disorder that is a common health problem in the world and affects almost the entire elderly population is low back pain. Low back pain is pain felt in the lower back area, not a disease or diagnosis for a disease but is a term for pain felt in the affected body area with various variations in the duration of pain. The purpose of this counseling activity is to provide knowledge about low back pain and exercise education to reduce pain intensity. The activity method used is counseling using leaflets with low back pain material and exercise education. The main targets were members and cadres of the elderly posyandu in RW 17 Mojosongo Solo. The result of this counseling is an increase in public understanding and knowledge about low back pain and exercises to reduce this pain. This proves that the counseling method using leaflets is quite effective. It can be seen from the results of the pre-test and post-test participants who showed an average increase of 45%.
OPTIMALISASI DIGITALISASI DINAS TENAGA KERJA SEBAGAI RECRUITMENT MANAGEMENT DALAM UPAYA MENGATASI PENGANGGURAN
Authors: Anggitaningsih Retna , Muizzat Mohammad Marsha Awwalul , Hidayat Raihan Zaky Maulana , Ardiansyah Normandha Ilham
Published: February 2024

Dalam pengabdian Masyarakat ini memiliki beberapa tuujuan, pertama, pendampingan dalam pembuatan AK1, kedua, terbuka lebarnya system informasi mengenai lowongan pekerjaan dan ekosistem ketenagakerjaan dengan system digitalisasi dan sehingga lebih terintegrasi. Dilakukan dengan metode PAR (Participatory Action Research), dengan beberapa tahapan yakni, partisipasi, perencanaan, pelaksanaan, serta evaluasi. Sehingga pengabdian ini menghasilkan output dari pengoptimalan system digitalisasi para pencari kerja maupun tenaga kerja yang dimudahkan  dalam mencari berbagai informasi, serta bentuk pelatihan kompetensi yang dilakukan berdampak positif juga terhadap Perusahaan yang ingin merekrut karyawan, karena telah mendapat bekal dari program pelatihan yang telah diadakan.
Foreign trading and firm value
Authors:   Ho Chi Minh City Open University, Phan Trang Quynh , Nguyen Khai Si ,   Ho Chi Minh City Open University, Vu Trung Minh Hoang ,   Ho Chi Minh City Open University
Published: February 2024

This study aims to investigate the effect of foreign trading on firm value, in terms of Tobin’s Q. Using the sample of Vietnamese listed firms over the 2010 – 2021 period and the Generalized Least Squares (GLS), the regression results show that the increase in foreign trading is positively associated with the increase in firm value. Specifically, the higher net traded value of foreigner the higher firm value is. In addition, the increase in net buy value also enhances firm value.
The effect of bank uncertainty to bank opacity in Vietnam
Authors:   Thu Dau Mot University, Nguyen Chung Hoang
Published: February 2024

The study examines the impact of uncertainty on bank opacity while particularly taking into account the moderating role of market structures. Using a sample of Vietnamese banks from 2007 to 2019, the paper measures uncertainty at the disaggregate level of the banking sector through the dispersion of bank shocks and regresses the bank opacity. The research introduces both structural and non-structural proxies of bank competition/concentration to better explore the role of market structures. Empirical regressions are conducted using the two-step system generalized method of moments (GMM) technique, and then verified by the least squares dummy variable corrected (LSDVC) estimator. The research result suggests that bank earnings opacity is less severe in periods of higher uncertainty. This implies that banks in a competitive markets need to reduce information asymmetry and more transparent in uncertainty.
Interne hierarkier i samisk idrett i Norge
Authors: Åsrum Skille Eivind
Published: February 2024

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MICROLECTURE/LAB HYBRID CLASS FOR BRIDGING THE GAP BETWEEN THEORIES AND APPLICATIONS IN TEACHING ENGINEERING SUBJECTS
Authors: Muhsan Ali Samer , Albarody Thar M. Badri
Published: February 2024

There is a paradigm shift taking place in the academy, in which the focus is moving from faculty, their teaching to learners and their learning. Efforts to improve the learner’s learning include a variety of innovative pedagogical approaches (such as first-year design courses, cooperative learning, problem base learning, technology-enhanced education, and distance learning). As engineering educators are leading the way in many of these areas, it is also important to recognize the role of learners in this transformation process. Most engineering lecturers who teach engineering mechanics, especially Statics and Dynamics are used to teach this subject in a theoretical manner. This research suggests a teaching method that could reduce or eliminate the gap between theories and applications in teaching engineering mechanical subjects through achieving a lecture/lab hybrid classroom environment where a portable lab illustration along with micro lecture method is implemented for learners’ engagement (learners-centered learning) and better teaching technique that covers both the visual/practical and the auditory/theory learning styles. In the micro lecture, the lecturer is available for learners at home through videos or internet-based lectures and class time is used to complete assignments by moving the instruction to the homework to the class. Learners are given more ‘one-on-one’ time with their lecturer to work their assignments and the role of the academic staff changes from a lecturer to an instructor. During class time, the portable lab toolkits are used to illustrate the main concepts of the given subject further. The instructor asks the learners to start an experiment by discussing with their peers and make a prediction of the outcome of that experiment. Thus, the learners’ preconceptions relevant to the phenomenon are studied. Secondly, learners perform the experiment and are asked to compare the outcome and prediction. If the outcome and prediction did not match, they would have to reflect on their observations.

Keywords: Portable lab, Flipped classroom, Technology-enhanced education, Problem based learning, Cooperative learning
A THEORETICAL EQUATION PRESENTING SLOPE IN VAN KREVELEN DIAGRAM FOR BIOMASS PYROLYSIS
Authors: Hoai Trinh Thanh , Uemura Yoshimitsu
Published: February 2024

The van Krevelen diagram has been used widely to describe the change of biomass composition during the thermochemical decomposition. However, the theoretical background on how the composition point of raw material moves towards the point of the product with thermochemical decomposition on the diagram has not been well clarified. This paper attempted to formulate a theoretical equation presenting the slope in van Krevelen diagram based on the removal rates of volatile products during thermochemical decomposition. An equation was established to predict the slope of the movement (or called as the reaction trend line) based on the generated amount of volatiles (H2O, CO2, CO and organics) during thermochemical conversion. This equation was applied to predict some empirical trend lines for torrefaction to confirm the relevamce of this equation, the consistency was excellent. Furthermore, the equation shows its capability in representing other thermal degradation process with a slope variation depending on the raw material.

Keywords: Biomass; thermochemical decomposition; van Krevelen diagram; change of composition
TREATMENT OF PRODUCED WATER FROM CRUDE OIL DESALTER BY COMPOSITE POLYAMIDE RO MEMBRANE
Authors: Borhan Azry , Mat Dait Mohd Nizam
Published: February 2024

Produced water generated from oil refinery desalting unit requires proper treatment to adhere to stringent regulations before discharging or recycling into the processing area. In this research, desalter’s produced water from PP(M)SB (PETRONAS Penapisan (Melaka) Sdn. Bhd.) was treated via AFC99 tubular thin film composite polyamide RO membrane and were investigated concerning TMP, feed pH and feed-solution concentration. The experimental results indicated that AFC99 membrane removed 100% of TSS and salinity, and more than 95% of COD, salts ions and TDS. This work shows that the RO membrane was feasible and technically viable to be used for optimum salts and contaminants removal from produced water of the desalting unit. Besides, the treated water (permeate) fulfills the watering standards and can be used for recycling and other purposes.

Keywords: produced water, reverse osmosis, polyamide membrane, operating conditions, watering standards
MITIGATION OF METHANE HYDRATE BLOCKAGE IN SUBSEA PIPELINES USING IONIC LIQUID AS HYDRATE INHIBITOR
Authors: Jasamai Mazuin , Idress Mazlin , Arshad Mohd. Zahdan , Taha Mohd Faisal
Published: February 2024

Gas hydrates one of a major problem in the oil and gas industry. Formation of gas hydrates causes flow assurance issues as it can plug the pipeline. The use of chemical inhibitors; kinetic hydrate inhibitors and thermodynamic hydrate inhibitors is one of the most feasible ways to solve this problem. However, the problem with thermodynamic inhibitors is that it required in a large dosage and cause environmental issues. Thus, this study emphasises on the usage of ionic liquid as an effective kinetic hydrate inhibitor. The ionic liquid is a green chemical that can be fine-tuned explicitly as a hydrate inhibitor. The aim is to study the effectiveness of 1-Ethyl-3-Methylimidazolium Tetrafluoroborate (EMIMBF4), an ionic liquid as a kinetic hydrate inhibitor at various pressure and concentration. Micro Differential Scanning Calorimeter was used to measure the induction time of methane hydrate. The performance of ionic liquid was tested in different concentration and compared to the commercial kinetic hydrate inhibitor, Polyvinylpyrrolidone (PVP). From the experimental work, it was found that EMIMBF4 shows a dynamic inhibition effect as it can delay the induction time of hydrate. EMIMBF4 shows a higher induction time at a low concentration of 0.1wt%. At the pressure of 60 bar, the effectiveness of EMIMBF4 is comparable with PVP. However, PVP shows superior kinetic inhibition effect at the pressure of 40 bar. This study indicates that an effective, green hydrate inhibitor can be developed to counter hydrate formation problems in offshore subsea pipelines in a more cost-effective and environmentally friendly

Keywords: Methane Hydrate; Hydrate Inhibitor; Ionic Liquid; EMIMBF4; Micro DSC; pipeline blockage
EVALUATING THE EFFECT WELL INCLINATION AND FORMATION ANISOTROPY ON CONING RATE IN DEVIATED WELLS
Authors: Adzhar Anis Zuriati , Adebayor Sulaimon Aliyu
Published: February 2024

In oil reservoirs with bottom water drive, coning is a fundamental problem during oil production. Horizontal and deviated wells are often used to reduce the effect of water coning on total oil production. To avoid the premature breakthrough of water, the production of oil should be maximised through effective monitoring of the critical coning rate, and many researchers have developed models to determine the critical coning rate. However, very few studies have been conducted to evaluate the effect of good inclination and formation anisotropy on the critical coning rate. Therefore, we have incorporated well deviation and formation anisotropy into a water coning model to investigate their effects on the critical coning rate. Previous researches have been limited mainly to the calculation of water critical coning rate in the vertical well. In this study, a combination of radial and spherical flows in deviated wells has been adopted to develop a new model for analysing coning in non-vertical wells. The well inclination considered ranged from 20o to 80o, horizontal permeability (kh ) from 100 mD to 200 mD and the vertical permeability (kv ) was varied from 2 mD to 10 mD. Results showed that highly-deviated wells and formations with a high degree of reservoir heterogeneity (kv/kh) result in high critical coning rate and therefore less susceptible to early water breakthrough. This shows that more allowance to increase the production rate is possible for horizontal wells and anisotropic formations than in vertical and homogeneous reservoirs.

Keywords: Water coning, deviated wells, reservoir heterogeneity, anisotropy permeability, critical coning rate, critical parameters.
MICROSTRUCTURE EVALUATION OF DISSIMILAR LASER BEAM WELDS –MDN 250 AND 15CDV6 STEELS
Authors: Pedapati Srinivasa Rao , M. V. L. Ramesh , Rao V. Venkateswara
Published: February 2024

A novel dissimilar Laser Beam Weld of MDN 250 and 15CDV6 steels with adequate joint strength was successfully achieved using CO2 laser source. Electron probe microanalysis of the weld, weld microstructure, micro-hardness measurement across the weldment and transverse tensile properties of the weldment were evaluated. The fusion zone of the dissimilar welds exhibits an epitaxial grain growth. In dissimilar metal welds, HAZ (Heat Affected Zone) width is more on 15CDV6 steel side compared to MDN 250 steel side. An asymmetrical hardness profile across the dissimilar weld joint was observed, and HAZ region on 15CDV6 steel exhibited a high hardness. The tensile strength values of the welded specimens were close to that obtained for sheet specimens.

Keywords: Laser beam welding, MDN 250 steel, 15CDV6 steel, Mechanical properties, Microstructure.
CHARACTERIZATION OF THE PLEISTOCENE FLUVIAL SYSTEM IN SEPAT FIELD, MALAY BASIN USING SEISMIC ATTRIBUTES ANALYSIS
Authors: Jamaludin Siti Nur Fathiyah , Rajasansi Tasvir Kaur , Abdul Latiff Abdul Halim
Published: February 2024

This study is focusing on the characterisation of Pleistocene to present day fluvial system found in Sepat Field in the offshore of Terengganu. It aims to characterise the fluvial system in Sepat Field and correlate the fluvial systems found in Sepat Field with the larger scale fluvial system of the Malay Basin. The methodological approach used for this subsurface study includes geological interpretation of 3-dimensional seismic data and wireline logs interpretation. Frequency spectral decomposition combined with variance and relative acoustic impedance attributes had provided a precise prediction on the dimensions, flow orientation and type of the fluvial systems in this field. This study shows that the fluvial system in this field is dominated by meandering channels that flow from northwest to southeast. Points bars, straight channels, channels boundaries and the evolution of the channels can be imaged and interpreted in this study through frequency spectral decomposition technique. A “hook” shape point bar stands out clearly in the data with depth up to 1.5km and is interpreted to be related to the Malay basin fluvial system. The fluvial system in Sepat Field is interpreted to deposit in the midstream river system and highly associated with the Chao Phraya-Johore River, with sediment sources come through this drainage basin and distributed to the tributaries fluvial channels including those in Sepat Field.

Keywords: seismic attributes, fluvial characterisation, Malay Basin, spectral decomposition, meandering river
FABRICATION OF FLEXIBLE EP-FG COMPOSITE AUTOMOBILE SHELL STRUCTURE USING COMPRESSION MOULDING PROCESS
Authors: Al-Jothery Husam Kareem Mohsin , Megat Yusoff Puteri Sri , Badri Albarody Thar M , K. Balakrishnan Vikneshwaran
Published: February 2024

Corrugations are believed to enhance the mechanical properties of a shell structure. In this study, the theory of corrugation is applied to enhance the flexibility of epoxy- fibreglass material which is being used widely in the automotive industry. It could fulfil the requirement of using a flexible composite material for automobile shell structure for a more crashworthy design. Two different corrugated profiles were studied in this project which are the damped curve and pyramidal groove profiles. Rubber moulds were fabricated and used for the corrugated epoxy-fibreglass composite preparation. A compression moulding machine was used to form the corrugations on the composite material as it can deliver high pressure and temperature to cure the laminate. In this study, the compression moulding process was carried out under constant parameters: temperature,pressure and holding time. Results obtained from the tensile test of the corrugated epoxy-fibreglass composite sheets were compared with the tensile properties of a flat epoxy-fibreglass composite sheet to determine the effect of corrugations in terms of flexibility. The pyramidal groove corrugation managed to enhance the flexibility of the epoxy-fibre glass composite sheet, however there was a significant decrease in yield load, and no notable changes in tensile strength, yield strength and elongation. On the other hand, the flexibility achieved by the sample with damped curve corrugation is higher than the flat sample but lower than the flexibility possessed by the pyramidal groove sample. Elongation of the damped curve sample prior to fracture is two times higher compared to the elongation achieved by both pyramidal groove and flat samples. In conclusion, the epoxy-fibreglass composite sheet with the damped curve corrugation profile is the best, as it exhibits the desired increase in flexibility with minimal loss in terms of tensile strength, yield load and yield strength.

Keywords: corrugation, thermoset composite, compression moulding, tensile test, damped curve, the pyramidal groove
LITHOSTRATIGRAPHY AND PALAEONTOLOGY OF THE ‘BLACK SHALE’ FACIES OF THE SEMANGGOL FORMATION (CHERT UNIT) AT BUKIT MERAH (PERAK, PENINSULAR MALAYSIA)
Authors: Estelle Liew Joannemarie , Gámez Vintaned José Antonio
Published: February 2024

In the Semanggol formation cropping out in Northern Perak, a ‘black shale’ facies was identified at the lowermost level of the chert unit at Bukit Merah, containing trace and body fossils. Despite some recent contributions made in Northern Perak outcrops, some questions about the origin of the ‘black shale’ facies remain open, particularly its depositional palaeoenvironment, palaeo-oxygenation history and biochronological age. Moreover, the presence of trace and body fossils in the facies contradicts ‘classical’ views of the ‘black shales’ of the Semanggol formation. Therefore, this study aims to describe the lithostratigraphic and palaeontological contents of the facies, as well as to apply sedimentological, palaeoichnological, petrographical and geochemical analyses for ascertaining the origin of it. The results revealed a shallow marine, sublittoral setting based on the identification of the Cruziana ichnofacies. The coarsening- and the thickening-upward trend observed in the studied stratigraphic section is compatible with a prograding, distal deltaic sequence. Two sources of additional oxygen are identifying as the episodic storm events andthe presence of microbial mats, which frequently replenished the oxygen levels at the seafloor. Hence, the deposition occurred under relatively well-oxygenated conditions. Finally, the age of the succession is Early Triassic based on the presence of the bivalve genus Claraia.

Keywords: Cruziana ichnofacies, palaeo-oxygenation, body fossils, sedimentological, petrographical, microbialmats
ANALYSIS OF THE EFFECT OF CRITICAL PARAMETERS ON CONING IN HORIZONTAL WELLS
Authors: Sulaimon Aliyu Adebayo , Abdullah Norlie , Vatsa Suyash
Published: February 2024

Water coning is described as an upward movement of water into the perforation in oil-producing wells which lead to water production along with the crude oil. This coning may reduce oil production rate and could substantially increase water production. Hence, many correlations from previous study and available solutions were investigated to estimate the actual critical oil rate to control water-coning in horizontal wells. Specifically, the effects of fluid and rock properties such as viscosity, formation thickness, horizontal permeability, length of horizontal wells and density difference between oil and water on the critical flow rate were investigated. Results show that the oil viscosity and density difference between oil and water have more pronounced effects on coning rate than other parameters. However, while coning tendency becomes more pronounced as the oil becomes more viscous, it is more favorable as the density difference increases (i.e. lighter oil). Moreover, the critical coning rate increases with an increase in the horizontal permeability and the well length. Knowledge of the impact of rock and fluid properties on coning is crucial in the design of mitigation strategies to prevent or effectively manage excessive water influx into the wellbore during oil and gas production.

Keywords: Water-coning, oil-critical rate, correlations, viscosity, density difference, horizontal wells
EVALUATION OF K-EPSILON MODEL FOR TURBULENT BUOYANT JET
Authors: Mohmmed Ahmed Osman Abu Bakr , Ovinis Mark
Published: February 2024

The modelling of a turbulent buoyant jet is challenging due to the complex nature of such flow, which consists of two fluids with different densities, as well as the multi-scale flow phenomena associated in both space and time. In this paper, the k-epsilon turbulence model is applied to model a turbulent buoyant jet at different flow regimes including laminar and turbulent. The velocity field and centerline velocity are in good agreement with the experiments, as well as the expected results based on jet theory. Moreover, the distribution of the radial velocity matches with Gaussian distribution. The k-epsilon model is an appropriate turbulent model that can be applied for larger Reynolds number flow simulation.

Keywords: k-epsilon, turbulence model, CFD, turbulent buoyant jet.
AUTOMATIC ARRHYTHMIA DETECTION ALGORITHM USING STATISTICAL AND AUTOREGRESSIVE MODEL FEATURES
Authors: Mohd Asri Muhammad Firdaus , Yahya Norashikin , Elamvazuthi Irraivan
Published: February 2024

Human heart healthiness is one of the major components to determine a person’s overall healthiness. Automatic arrhythmia detection is important in a remote area where there is a lack of experienced cardiologists. In this work, an automatic arrhythmia detection algorithm is developed using statistical and autoregressive features to assist medical officers in the diagnosis of arrhythmia diseases. Basic statistical components namely mean, energy, standard deviation, mean absolute deviation, fractal, inter-quartile range and min/max value, were calculated. Alongside with statistical features, 10th order auto-regressive model parameters are used as input features to support vector machine (SVM). All features are calculated using an electrocardiogram (ECG) signals windowed into per beat manner. The proposed algorithm is able to classify normal ECG beat and five types of abnormal ECG beat; paced beat, right & left bundle branch block beat, premature ventricular contraction beat and aberrated atrial premature beat. By using SVM with quadratic and cubic kernel function, the proposed algorithm achieved the best accuracy of 95.8%.

Keywords: ECG, cascade-SVM, AR model, statistical model, heart condition, computer-aided diagnosis
MORPHODYNAMICS OF THE TELUK NIPAH SHORELINES
Authors: Foo Wen Yao , Teh Hee Min , Babatunde Abdul-Lateef
Published: February 2024

The coastal retreat is one of the most common problems taking place at littoral zones, and it will only become an issue if the area is overwhelmed with commercial developments and anthropogenic activities. The coastal erosion experienced by the shoreline of Teluk Nipah, which is located at the west of Pangkor Island in Malaysia, has triggered some levels of attention among the local authorities and community. The root cause of the erosion and shoreline retreat rates remain uncertain, is due to the unavailability of records studies on beach morphodynamics in the past. Hence, this study aims to assess the decadal shoreline changes of Teluk Nipah by using remote sensing technology. Landsat satellite imageries, which ranges from 1990 to 2018, have been acquired for quantification of the shoreline change rate at Teluk Nipah using a GIS software - ArcGIS. The analysis results indicated that the shoreline is dynamic and unstable between the 1990s to 2010s. The most populated area of the shoreline experienced critical erosion that requires immediate attention by the stakeholders.

Keywords: Coastal morphology, coastal retreat, erosion, littoral zone, remote sensing
EFFECT OF CUTTING PARAMETERS ON TEMPERATURE OF A SINGLE POLYCRYSTALLINE DIAMOND COMPACT (PDC) CUTTER
Authors: Abdullah Abdul Hazim , Maoinser Mohd Azuwan
Published: February 2024

The usage of polycrystalline diamond compact (PDC) drill bit has significantly increased in the petroleum industry due to its high rate of penetration and long life. However, it is becoming increasingly difficult to ignore the temperature effect to PDC bit, specifically its cutter during the drilling operation. Temperature causes the degradation of the PDC cutter by reducing its lifespan. A thorough understanding of factors that affect the temperature of the PDC cutter is crucial in predicting the optimum cutting parameters. Hence, it is the objective of this study to evaluate the effect of cutting parameters on the temperature of the single PDC cutter in rock cutting. In this study, a rock cutting experiment was conducted by using a lathe machine tested on single PDC cutter. The parameters involve were rotational speed and depth of cut. The temperature was captured using an infrared thermographic camera, FLIR T640 and the spot measurement was used to pinpoint the temperature readings at the tooltip of PDC cutter. It was found that the depth of cut had the greater influence on temperature when measured over a range of 16 levels as the temperature increase in linear trend with increasing depth of cut as well as the high correlation of the plot (R2=0.98). However, tests for rotational speed showed less significant influence on temperature when measured over a range of four levels where the percentage error of the temperature for each rotational speed was less than 10%. It can be concluded that only the depth of cut has a significant effect on the temperature of a single PDC cutter.

Keywords: Rock cutting, temperature, Polycrystalline Diamond Compact (PDC), rotational speed, depth of cut
SIMULATION OF CO-PROCESSING BIO-OIL AND VGO IN FLUID CATALYTIC CRACKING UNITS
Authors: Alias Amirah Farhana , Adi Putra Zulfan , Bilad M Roil , Wirzal M Dzul Hakim , M Nordin Nik Abdul Hadi
Published: February 2024

Biofuel is a promising substitute for fossil fuels to reduce greenhouse gas emissions and to provide highly sustainable fuels. Several technical challenges are indeed present during upgrading bio-oil to transportation fuel on a large scale. Co-processing bio-oil with some petroleum fractions in existing refineries serves as an alternative method to minimise processing costs. This paper aims to evaluate the co-processing by exploring the effects of temperature, bio-oil ratios and types of bio-oil to the product yields and quality in a Fluid Catalytic Cracking (FCC) unit within a refinery complex. The considered bio-oil are produced from pyrolysis of Palm Kernel Shell (PKS) and Empty Fruit bunch (EFB). The results show that bio-oil from PKS is better suited to produce gasoline due to its aromatic nature and its carbon range similarities compared to that from EFB. A mixture of 20% of hydrodeoxygenated (HDO) PKS in vacuum gas oil (VGO) shows a 5% improvement of naphtha yield while 20% raw bio-oil from PKS produces 4% increase in light cycle oil (LCO) yield.

Keywords: co-processing, fluid catalytic cracking, bio-oil, palm kernel shell, empty fruit bunch, simulation
STUDENTS’ PERCEPTION TOWARD THE INVOLVEMENT IN DEVELOPING INSTRUCTIONAL VIDEOS USING POWTOON TOOL
Authors: Mohyaldinn Mysara Eissa , Kaur A. , Alhassan H.S. , Hasan M.L. , Yousif A. , Ayoub M.A.
Published: February 2024

Student-faculty partnership has proven to significantly enhance many attributes in the teaching-learning process due to its ability to expose students to higher levels of engagement, enforcing the confidence, motivation, and responsibility of the students, as well as the establishment of a friendly and tight relationship between the students and faculties. Nevertheless, the student-faculty partnership is not only limitedly practised in Malaysia, but also the occasionally reported practices have involved matured postgraduate students with educational background and significant experience in teaching and learning. In this study, the student-faculty partnership has been implemented for undergraduate students to enhance the process of teaching and learning. This is done by involving the students in developing instructional videos using POWTOON tool. The study analysed three sources of data, viz. a survey questionnaire, online quiz marks, and test 1 marks, to assess the students’ perception toward this experience as well as to evaluate its impact on their academic performance. The findings indicate that student-faculty partnership has significantly improved the students’ learning and soft skills. In fact, the students responded positively to the activities conducted throughout this experience and gave positive feedback about the developed instructional materials. As an implication of this study, we strongly believe that the findings will serve as a good start for spreading the practice of the partnership of undergraduate students with faculties in Malaysian universities.

Keywords: Partnership, learning, improvement, engagement
SIGNIFICANCE OF BATH TEMPERATURE IN LOADING HALLOYSITE NANOTUBE WITH A CORROSION INHIBITOR
Authors: Suresh Kumar Subhalakshmi , Kakooei Saeid , Ismail Mokhtar Che , Haris Muhammad
Published: February 2024

Smart anti-corrosion coatings have gained importance over the last few decades due to its significant properties and the ability to protect metals over a long time. Halloysite nanotubes based smart coatings, in particular, are the centre of research interest as it is non-toxic, cheap and has properties similar to carbon nanotubes. Hence there is a need to study the different parameters affecting the loading efficiency of halloysite nanotubes. In this paper, Sodium diethyldithiocarbamate trihydrate was loaded into the halloysite nanotubes in a vaporiser using ethanol as the solvent at different bath temperatures of 80°C, 60°C and 40°C. The obtained samples were characterised using Scanning Electron Microscope, Fourier Transform Infrared Spectroscopy, UV-Vis Spectroscopy to study the structure and morphology, the bonds formed by various components, the transmittance and the absorbance. The results showed that the halloysite nanotubes loaded at 80°C had higher loading efficiency than the ones loaded at 60°C and 40°C.

Keywords: smart coatings, vaporiser, sodium diethyldithiocarbamate trihydrate, SEM, FTIR analysis, loading capacity
THERMAL STABILITY STUDY OF GREASE FORMULATED FROM INDUSTRIAL WASTE OIL
Authors: Rahman W. , Abdul Aziz Mohd Aizuddin , Hamid Norasiha , Japar N.S.A.
Published: February 2024

This is aimed to investigate the effect of additives on thermal stability of grease formulated with waste transformer oil (WTO). One of the key factors of grease functionality is thermal stability. Grease is unsuitable for high-temperature use if the matrix is unable to withstand high temperature. Addition of additive is able to improve the grease thermal stability. In this work, three types of additives (molybdenum disulphide, fumed silica, and polytetrafluoroethylene) were tested as thermal stability additive. The grease was characterized using ASTM International standards and SKF’s Grease Test Kit. Based on grease characterization, the addition of additive was found slightly affecting the grease properties. Fumed silica was observed able to improve the grease thermal stability by 3.6%.

Keywords: Waste transformer oil, thermal stability, sodium grease, molybdenum disulphide, fumed silica, PTFE