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Evaluation Of Mimo Antenna Configurations For High Data-Rate Systems, Ammar Abdulimam Abbood Jun 2026

Evaluation Of Mimo Antenna Configurations For High Data-Rate Systems, Ammar Abdulimam Abbood

Al-Esraa University College Journal for Engineering Sciences

This paper introduces a new design of cat-shaped antenna in super wideband (SWB) and high data-rate multiple input multiple output (MIMO) systems. The single-element SWB antenna has a wide frequency range of 2.23 GHz up to more than 100 GHz with outstanding bandwidth ratio (BW Ratio = 44.84:1), fractional bandwidth (FBW = 191%), bandwidth dimensional ratio (BDR = 5567) and a peak gain of 9.52 dB. The single antenna was also expanded to 2 × 2 MIMO array to further improve performance on multipath environments. Measurements and simulation show very good results using radiation patterns, isolation, channel capacity loss (CCL), …

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Enhancement Of Tribological Behavior Of Rotating Bearings Using Advanced Ceramic Compounds Via Thermal Spray Techniques, Amjid Shihab Abdul Jaleel Jun 2026

Enhancement Of Tribological Behavior Of Rotating Bearings Using Advanced Ceramic Compounds Via Thermal Spray Techniques, Amjid Shihab Abdul Jaleel

Al-Esraa University College Journal for Engineering Sciences

Rotating machines constitute the main part of the most important industrial sectors in Iraq such as oil and gas production, power generation, and manufacturing. The harsh operating conditions however, in the form of high temperatures, corrosive agents and abrasive particulates are causes of premature failure of crucial components such as journal bearings. This study examines the improvement of tribological characteristics of normal steel journal bearings using superior ceramic coating using thermal spray. In particular, atmospheric plasma spray (APS) was used to deposit Alumina-Titania (Al2O3–TiO2) and Zirconia (ZrO2)coating on A106 Grade B carbon …

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Effect Of Nano-Additives On Fracture Toughness Of Engineering Materials: An Experimental Study, Humam Ahmed Awad Jun 2026

Effect Of Nano-Additives On Fracture Toughness Of Engineering Materials: An Experimental Study, Humam Ahmed Awad

Al-Esraa University College Journal for Engineering Sciences

Structural integrity and service life of engineering components is based on fracture resistance. The paper presents an experimental study on the nano-additive that can be added to the locally-produced Iraqi engineering materials in order to enhance their fracture toughness. The research was inspired by the increasing demand in high-performance materials in the main sectors of the country such as infrastructure and energy besides the need to improve the properties of local resources. The tested material systems were two Portland cement composites and epoxy-based polymers. Nano-silica (n-SiO2 nano-alumina (n-Al2O3) and multi-walled carbon nanotubes (MWCNTs) were added …

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Experimental Study Of The Effect Of Nano-Doping On The Electrical And Thermal Properties Of Organic Semiconductors, Zainab Abdulateef Rashad Jun 2026

Experimental Study Of The Effect Of Nano-Doping On The Electrical And Thermal Properties Of Organic Semiconductors, Zainab Abdulateef Rashad

Al-Esraa University College Journal for Engineering Sciences

This paper has introduced an experimental research case on the impact of nano-doping on electrical and thermal characteristics of organic semiconductor thin-film. The overall goal of the study is to study the effect of controlled addition of nano-dopants on charge transport characteristics and thermal stability that are important criteria in organic electronic device applications. Solution-based deposition was used to produce the thin films at a different concentration of nano-dopant and, systematic electrical and thermal measurements were carried out under controlled laboratory conditions. Electrical characterization showed that there was high improvement of electrical conductivity as the nano-dopant concentration was high, especially …

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An Intelligent System For Managing High-Priority Vehicle Routing In Smart Cities Using Artificial Intelligence And Spatial Data Analytics, Bahjat Abdulelah Madhloom Jun 2026

An Intelligent System For Managing High-Priority Vehicle Routing In Smart Cities Using Artificial Intelligence And Spatial Data Analytics, Bahjat Abdulelah Madhloom

Al-Esraa University College Journal for Engineering Sciences

In developing metropolises, there is a risk to public safety in addition to the usual traffic jams. Traffic delays can have life-altering effects every second that fire trucks and ambulances are delayed. Large cities like Baghdad, which suffer from haphazard road sealing and incompetent traffic management, are especially affected, creating daily emergency crisis problems. We create a new intelligent routing system for these top priority vehicles in order to solve this life-or-death problem. Our method uses a trained model with real-time spatial information instead of outdated static maps. A Long Short-Term Memory (LSTM) neural network at its core constantly forecasts …

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Improvement Of Mechanical And Corrosion Properties Of Weld In Stainless Steel In Crude Oil Tank By Using Nano-Fillers, Ali Abdulzahra Shanshoon Jun 2026

Improvement Of Mechanical And Corrosion Properties Of Weld In Stainless Steel In Crude Oil Tank By Using Nano-Fillers, Ali Abdulzahra Shanshoon

Al-Esraa University College Journal for Engineering Sciences

The aim of this study is to investigate the corrosion behavior and mechanical properties of welded steel exposed to gases emitted from crude oil reservoirs. In this study, two types of nanoparticles were used as fillers during welding to improve corrosion and mechanical properties. TiO2 and SiO2 nanoparticles were mixed with soldering oil in four mass concentrations of 0, 1, 2.5 and 5% by ultrasonic bath method and used as filler during the welding process. In order to prepare the samples, plain carbon steel with a thickness of 3 mm was used and they were welded together by …

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Strategic Optimal Design Of Energy Storage Systems For Enhancing Stability And Sustainability In Electrical Distribution Networks, Hayder Abdulhussein Allawi Jun 2026

Strategic Optimal Design Of Energy Storage Systems For Enhancing Stability And Sustainability In Electrical Distribution Networks, Hayder Abdulhussein Allawi

Al-Esraa University College Journal for Engineering Sciences

The paper will provide a multi-objective model of optimizing the strategic placement and size of Battery Energy Storage Systems (BESS) in the Iraqi electrical distribution systems. The power grid of Iraq has deep issues, such as chronic power shortages, extreme grid instability, and astronomical technical and non-technical losses, and they can be up to 50 percent of the power generated. These problems require new solutions that will make the grid more modern and reliable in terms of energy security. The suggested methodology combines a Multi-Objective Particle Swarm Optimization (MOPSO) algorithm and the specific mathematical models of BESS and renewable energy …

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Three Centuries Of Technological Innovation, Jordan G. Okie, James H. Brown, Astrid Kodric-Brown, Joseph R. Burger, Tatiana P. Flanagan, Trevor S. Fristoe, Sean T. Hammond, Norman Mercado-Silva, Jeffrey C. Nekola, Jennifer Richter Jun 2026

Three Centuries Of Technological Innovation, Jordan G. Okie, James H. Brown, Astrid Kodric-Brown, Joseph R. Burger, Tatiana P. Flanagan, Trevor S. Fristoe, Sean T. Hammond, Norman Mercado-Silva, Jeffrey C. Nekola, Jennifer Richter

Biology Faculty Publications

What socioecological conditions nurture the ingenuity and collaborative interactions underlying transformative technological innovations? We compiled a dataset on more than 400 major technological inventions from 1690 to 1990 spanning seven categories (agriculture, armaments, information and communication, household, industry, medical, and transportation) and performed inductive macroecological analyses to address how attributes of inventors, teams, and their social and geographic environments contributed to the innovation of new technologies that have changed the way people live. The vast majority of inventions were attributed to single inventors of various ages. The frequency, size, and cultural diversity of teams increased in the 20th Century, as …

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Russian Language In An Interdisciplinary Setting: A Case Study, Foreign Area Studies At The United States Naval Academy, Joan Chevalier Jun 2026

Russian Language In An Interdisciplinary Setting: A Case Study, Foreign Area Studies At The United States Naval Academy, Joan Chevalier

Russian Language Journal

Russian language enrollments have been dropping in recent years at colleges and universities in the United States. In contrast to this national trend, the number of students studying Russian language at the United States Naval Academy (USNA) has remained robust over the past decade and is poised to increase in the near future as a relatively new interdisciplinary major, Foreign Area Studies (FAS), is expanded and revised. This paper traces recent developments at USNA that have led to the development and expansion of Foreign Area Studies, integrating language study into an interdisciplinary curriculum featuring courses related to nations and cultures …

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Tier 2 Monitoring In The Great Bay Estuary, Nh/Me Field Season 2025, Christopher Whitney, Amanda Giacchetti, Lara M. Martin, Trevor Mattera, Kalle Matso, David M. Burdick, Thomas K. Gregory Jun 2026

Tier 2 Monitoring In The Great Bay Estuary, Nh/Me Field Season 2025, Christopher Whitney, Amanda Giacchetti, Lara M. Martin, Trevor Mattera, Kalle Matso, David M. Burdick, Thomas K. Gregory

PREP Reports & Publications

No abstract provided.

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Factors Affecting The Incidence Of Stunting In Sawangan Subdistrict, Depok City, In 2023, Amanda Salsabila, Shaumi Maghfira Lamakampali, Erin Shafa Jasmine, Vera Putri Pranoto, Ratu Ayu Dewi Sartika, Primasti Nuryandari Putri Jun 2026

Factors Affecting The Incidence Of Stunting In Sawangan Subdistrict, Depok City, In 2023, Amanda Salsabila, Shaumi Maghfira Lamakampali, Erin Shafa Jasmine, Vera Putri Pranoto, Ratu Ayu Dewi Sartika, Primasti Nuryandari Putri

Jurnal Nasional Kesehatan Lingkungan Global

Stunting remains a major problem in Indonesia, particularly in Depok City, West Java. This study aims to analyze the factors influencing stunting in Sawangan District. The study design used is a cross-sectional study, analyzing test variables such as stunting incidence, maternal characteristics (age, education, maternal nutritional status during pregnancy, and personal hygiene), and toddler factors (exclusive breastfeeding status and LBW incidence) using univariate, bivariate (chi-square test), and multivariate (binary logistic regression) analyses. The analysis shows that maternal personal hygiene and LBW incidence in toddlers significantly influence stunting incidence. Other factors, such as age, education, and maternal nutritional status during pregnancy, …

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Association Between Cooking Fuel Type And The Incidence Of Acute Respiratory Infections In Toddlers In Indonesia: A Cross-Sectional Study Based On 2017 Sdki Data, Ghina Puspa, Meiravigliosi Hermawan, Nuha Rafida Yumna Jun 2026

Association Between Cooking Fuel Type And The Incidence Of Acute Respiratory Infections In Toddlers In Indonesia: A Cross-Sectional Study Based On 2017 Sdki Data, Ghina Puspa, Meiravigliosi Hermawan, Nuha Rafida Yumna

Jurnal Nasional Kesehatan Lingkungan Global

Acute Respiratory Tract Infection (ARI) remains a major health problem among toddlers in Indonesia and is closely related to exposure to indoor air pollution. This study aims to analyze the relationship between the type of cooking fuel used by households and the incidence of ARI in toddlers in Indonesia. The study used a cross-sectional design based on data from the 2017 Indonesian Demographic and Health Survey. The study sample included 196,804 respondents who met the inclusion criteria, namely having complete information on the type of cooking fuel and ARI symptoms. The independent variable was the type of cooking fuel divided …

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The Relationship Between The Physical Quality Of Household Drinking Water And The Incidence Of Diarrhea In Toddlers In Central Papua Province Based On 2023 Ski Data: A Cross- Sectional Study, Dicky Mahendra Zaglul Zaglul Jun 2026

The Relationship Between The Physical Quality Of Household Drinking Water And The Incidence Of Diarrhea In Toddlers In Central Papua Province Based On 2023 Ski Data: A Cross- Sectional Study, Dicky Mahendra Zaglul Zaglul

Jurnal Nasional Kesehatan Lingkungan Global

Diarrhea among children under five remains a significant public health problem, particularly in areas with limited access to clean water, such as Central Papua Province. The physical quality of household drinking water is often used as an initial indicator of water safety; however, its association with diarrhea incidence among under-five children is not yet fully understood. This study aimed to analyze the relationship between the physical quality of household drinking water and the occurrence of diarrhea among children under five in Central Papua Province using data from the 2023 Indonesian Health Survey (SKI). A cross-sectional study design was applied using …

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Predictors Of Culture-Positive Urinary Tract Infections And Antibiotic Resistance Among Pregnant Females In Al-Hilla City: A Cross-Sectional Study, Zainab Salim Husein, Ishraq Ahmed Chiad, Zeena Jamal Alkhazraji Jun 2026

Predictors Of Culture-Positive Urinary Tract Infections And Antibiotic Resistance Among Pregnant Females In Al-Hilla City: A Cross-Sectional Study, Zainab Salim Husein, Ishraq Ahmed Chiad, Zeena Jamal Alkhazraji

Al-Esraa University College Journal for Medical Sciences

Background: Urinary tract infection (UTI) is a frequent health problem in women. Patients often present with significant pyuria, and sometimes with no bacterial growth. Objective: The purpose of this study was to investigate the correlations between demographic, clinical, and behavioral factors and urine culture findings and to analyze the antibiotic sensitivity patterns of the isolated uropathogens. Methods: A cross-sectional study was done among pregnant women presenting with elevated pus cells (> 20 cells/HPF). Data on demographic characteristics, pregnancy complications, and hygiene habits were analyzed. Urine culture and comparative antibiotic sensitivity tests were performed for the isolated pathogens (Escherichia coli …

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Cleft Lip And Palate: From Genetic Foundations To Psychological Impact – A Multidisciplinary Review, Farah Abdulwahab Al-Saadi, Teeba Fares Hadi, Sura Saleem Albermani Jun 2026

Cleft Lip And Palate: From Genetic Foundations To Psychological Impact – A Multidisciplinary Review, Farah Abdulwahab Al-Saadi, Teeba Fares Hadi, Sura Saleem Albermani

Al-Esraa University College Journal for Medical Sciences

Cleft lip and/or cleft palate consider one of the most known and common congenital disorders of the head causing clear disruption of the normal face structure. Despite being the most seen birth defects, the clefts genetic basis is still not fully comprehended. Clefts have sporadic genetic nature, it can occur duo to rare mutations as part of syndromic disease or it can be isolated, non-syndromic cleft. The contemporary advances in genomic technology have enabled a deeper comprehension of the complex architecture of cleft lip/palate, of these technologies are genome-wide association studies, whole genome sequencing, transcriptome-wide association studies and others. Furthermore, …

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Measure The Sensitivity Of Streptococcus Mutans Against Cds Nanoparticles, Ali Essam Ali, Sara Habeeb Jassim, Abeer Ali Marhoon Jun 2026

Measure The Sensitivity Of Streptococcus Mutans Against Cds Nanoparticles, Ali Essam Ali, Sara Habeeb Jassim, Abeer Ali Marhoon

Al-Esraa University College Journal for Medical Sciences

Dental caries is the most common disease that poses a threat to human health. As a result, caries prevention is crucial because it is now a major global public health issue. Nowadays, there is more focus on employing nanoscale medication delivery devices to prevent dental cavities. Here, an antibacterial activity of CDs synthesis with allover plant by measuring the turbidity and bacterial colony after the effect of CDs NPs on the one-off gram-positive bacteria streptococcus mutans that cause dental caries. The results showed significant (p < 0.05) concentration of 10, 15, 25 μ g/mL of CDs NPs. Fourier transmission infrared spectroscopy (FT-IR) analysis showed the effect of CDs NPs on the bacterial cell, scanning electron microscopy (SEM) that showed the size, shape and the attachment of Nanoparticles to the bacterial cell wall that support the effect of nanoparticles on bacteria. When compared to chemical and physical procedures, environmentally friendly technologies can produce simple, easy, and affordable nanoparticles. has the capacity to function as antimicrobial agents.

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The Pink Color Of Composite In Esthetic Prosthodontics, Reem Abdulrahim Alobaidy Jun 2026

The Pink Color Of Composite In Esthetic Prosthodontics, Reem Abdulrahim Alobaidy

Al-Esraa University College Journal for Medical Sciences

Studies on the detailing of gingival color used a narrative path. Researches on visual gingival color record had various aims, methods, and measurements. It is difficult to match or even join their scores in a scientifically significative mode. A literature search was implemented in the online databases – PubMed, Science Direct, Medline and Google Scholar with the feedback of that progress in dental materials and technology appear handed concernedly due to their special properties and temple of pink gingival color. The activity between gingival color and the shade of ceramic restorations has never been fully discussed. Purpose of this study …

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The Role Of Nanotechnology In Improving The Physical And Mechanical Properties Of Denture Base Material, Rasha Mehdi, Intisar J. Ismail, Ahmed Ali Mohammed Jun 2026

The Role Of Nanotechnology In Improving The Physical And Mechanical Properties Of Denture Base Material, Rasha Mehdi, Intisar J. Ismail, Ahmed Ali Mohammed

Al-Esraa University College Journal for Medical Sciences

Background: Polymethyl methacrylate (PMMA) is still the most common material used for denture bases but its mechanical and physical properties. The aim of this systematic review was to assess the application of nanotechnology for enhancing physical and mechanical properties of denture base materials. Methods: A systematic search of PubMed/MEDLINE, Scopus, and Web of Science was performed to identify in vitro experimental studies from 2020 through 2025. The review was conducted according to the PRISMA 2020 statement. Included studies that characterised the mechanical or physical properties of nanoparticle-reinforced denture base materials. Results: Fourteen in vitro experimental studies were eligible for the …

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The Influence Of Coloring Liquids On The Flexural Strength Of Monolithic Zirconia, Ali Ibrahim Naser, Nidhal Sahib Mansoor Jun 2026

The Influence Of Coloring Liquids On The Flexural Strength Of Monolithic Zirconia, Ali Ibrahim Naser, Nidhal Sahib Mansoor

Al-Esraa University College Journal for Medical Sciences

Objective: This systematic review investigates the impact of coloring liquids and methods of application on the flexural strength of monolithic zirconia. Methods: a comprehensive search was carried out in PubMed (MEDLINE), Google Scholar, and Scopus without any limitations based on the year of publication, adhering to PRISMA 2020 guidelines. Inclusion criteria consisted of the studies with reported in vitro experiments that focused on the effects of the coloring liquid on the mechanical and microstructural properties of the zirconia. Systematic reviews, case reports, narrative reviews, post-sintering staining studies, and research on pre-shaded zirconia were among the papers excluded. Results: A total …

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Comprehensive Evaluation Of The Severity And Contributing Factors Of Anemia Among Pregnant Women Attending Bab Al-Mouadum Primary Health Care Center, Baghdad, Iraq, Fatema Aouda Abbas, Enass Razzaq Hamza, Israa. M. Ali Alameen Jun 2026

Comprehensive Evaluation Of The Severity And Contributing Factors Of Anemia Among Pregnant Women Attending Bab Al-Mouadum Primary Health Care Center, Baghdad, Iraq, Fatema Aouda Abbas, Enass Razzaq Hamza, Israa. M. Ali Alameen

Al-Esraa University College Journal for Medical Sciences

Background : Anaemia is one of the famous disorders which spreading between women during pregnancy and considered one of the risks that surround both mother and foetus, this phenomena is more common in developing countries. Methods : The aim of this study is to evaluate haemoglobin (Hb) levels and detect the other related risks in 200 pregnant women, the study done in healthcare centre in Bab Al-Mouadum, Baghdad Al Iraq, The data were collected in period between 15 October and 15 November 2023. By using questionnaire and interview, the statistical analyses is done by expert, and its including descriptive statistics …

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The Effect Of Using All Around Major Stabilizer On Dimensional Change Of Zirconia Material Under Conventional Sintering, Ali Thaer Kadhom, Israa Mohammed Hummudi Jun 2026

The Effect Of Using All Around Major Stabilizer On Dimensional Change Of Zirconia Material Under Conventional Sintering, Ali Thaer Kadhom, Israa Mohammed Hummudi

Al-Esraa University College Journal for Medical Sciences

Background: Zirconia had emerged as a highly promising material for the production of attractive dental restorations due to its mechanical properties. One of the biggest issues with zirconia long bridge affected on dimension after sintering. The dimensional change of a zirconia bridge of more than six units after sintering will be affected. The aim of study: To evaluate the dimensional changes that occur during the fabrication process of a monolithic stabilized zirconia full-anatomy bridge under the influence of all around major stabilizer. Materials and Methods: The cast and specimen were designed digitally by Exo-Cad software. The specimen was designed from …

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Prevalence And Determinants Of Metabolic Syndrome Among Adults Attending Primary Health Care Centers In Baghdad: A Cross-Sectional Study, Muammar Basheer Yasir, Almottesembellah Abdalruhman Gaiz, Noor Abdulredha Jaleel Jun 2026

Prevalence And Determinants Of Metabolic Syndrome Among Adults Attending Primary Health Care Centers In Baghdad: A Cross-Sectional Study, Muammar Basheer Yasir, Almottesembellah Abdalruhman Gaiz, Noor Abdulredha Jaleel

Al-Esraa University College Journal for Medical Sciences

Metabolic syndrome has emerged as an important health concern globally, especially in developing countries where urbanization and lifestyle changes are rapidly increasing. No reliable epidemiological information regarding the prevalence and risk factors associated with metabolic syndrome is available among Iraqi adults in primary health care (PHC) clinics. This study was designed to determine the prevalence rate of metabolic syndrome and identify potential risk factors among adults attending PHC centers in Baghdad. Methods: An analytical cross-sectional study design was used, targeting 412 adult subjects selected randomly from multiple PHC centers in Baghdad. Sociodemographic, lifestyle, anthropometric, and biochemical data were collected. The …

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The Association Between Osteoporosis In Females Following Menopause And Vitamin D Deficiency, Hadel Kareem Al-Rubaiawi, Noor Adel Hussein, Dunia Abdul Jabbar Star, Amer Hasan Abdullah, Salma Abdul-Ridha Abbas, Hawazin Aziz Hamim Jun 2026

The Association Between Osteoporosis In Females Following Menopause And Vitamin D Deficiency, Hadel Kareem Al-Rubaiawi, Noor Adel Hussein, Dunia Abdul Jabbar Star, Amer Hasan Abdullah, Salma Abdul-Ridha Abbas, Hawazin Aziz Hamim

Al-Esraa University College Journal for Medical Sciences

The intricate relationship among osteoporosis, vitamin D deficiency, and hormonal changes. Growth hormone, cortisol, parathyroid hormone, estrogen, testosterone, thyroid hormones, and thyroid hormones are a few of the hormones that affect bone turnover and density. Alterations in their concentrations, whether brought on by healthy aging or illnesses, can interfere with bone remodelling and increase the risk of osteoporosis. Moreover, inadequate levels of vitamin D increase the risk by decreasing the absorption of calcium and the mineralization of bone. Estrogen and vitamin D deficits increase bone loss, especially in postmenopausal women. Proactive treatment techniques, including hormone replacement therapy, vitamin D supplements, …

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Reinforcement Of Maxillofacial Silicone, Taqwa Majid Abdulhussein, Thekra Ismael Hamad Jun 2026

Reinforcement Of Maxillofacial Silicone, Taqwa Majid Abdulhussein, Thekra Ismael Hamad

Al-Esraa University College Journal for Medical Sciences

Maxillofacial prostheses are very important for helping people with head and neck defects (caused by congenital disabilities, accidents, or cancer treatments) get better. Their goal is to restore oral function, comfort, appearance, and mental health. Since the 1960s, silicone elastomers, especially polydimethylsiloxane, have been considered the best materials because they are highly resistant to tearing and stretching, biocompatible, and naturally colour-stable, but silicone has a very short clinical lifespan because it breaks down when exposed to UV radiation, moisture, biological fluids, and mechanical stress. The main goal of reinforcement is to add fillers to silicone elastomers to strengthen and improve …

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Organic Coumarin Derivatives As Laser-Active Materials: A Review Of Synthesis, Optical Behaviour, And Applications, Aya H. Mohammed, Mohammed Hasan Al-Dahlaki Jun 2026

Organic Coumarin Derivatives As Laser-Active Materials: A Review Of Synthesis, Optical Behaviour, And Applications, Aya H. Mohammed, Mohammed Hasan Al-Dahlaki

Al-Esraa University College Journal for Medical Sciences

Coumarin derivatives have settled into a position of unusual prominence among organic laser-active materials. Few other chromophore families combine such favourable photophysics with synthetic chemistry that is at once long-established and still actively evolving. The aim of this review is to draw together what is now known about coumarin-based laser dyes — their preparation, their optical behaviour, the laser performance that has been achieved with them, and the broader applications that have followed — with particular attention to work published between 2019 and 2026. Considerable space is given to the structural origin of the strong intramolecular charge transfer (ICT) character …

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Term Limit Effects In Indonesia: Local Government Revenue Vs. Spending, Hanik Susilawati Muamarah Jun 2026

Term Limit Effects In Indonesia: Local Government Revenue Vs. Spending, Hanik Susilawati Muamarah

Jurnal Akuntansi dan Keuangan Indonesia

Background: The term limit of local leaders creates a puzzle between the "lame-duck effect" (declining performance) and the "competence effect" (improved performance). This study contextualizes this dilemma within the Indonesian context, which has strong incentives for non-re-election, such as the formation of political dynasties. We investigate this puzzle by examining the relationship between term-limited leaders and two distinct fiscal policy areas: regulation-bound tax revenue and discretionary capital expenditure. Methods: A fixed-effects model was employed to analyze panel data from 438 regencies and municipalities from 2017 to 2023. Findings: In the high-discretion area of spending, term-limited leaders increase capital expenditure, supporting …

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Exergy-Based Rematching Of A Crude Preheat-Train Heat Exchanger Network: An Industrial Refinery Case Study, Shuhaimi Mahadzir, Mohamed A Ali Maghtuf Jun 2026

Exergy-Based Rematching Of A Crude Preheat-Train Heat Exchanger Network: An Industrial Refinery Case Study, Shuhaimi Mahadzir, Mohamed A Ali Maghtuf

Platform: A Journal of Engineering

Crude distillation units are among the most energy-intensive systems in petroleum refineries because crude oil must be heated to the required atmospheric-column inlet temperature before fractionation. Although conventional heat-integration analysis quantifies heat recovery, it does not identify the degradation of energy quality caused by finite-temperature heat transfer and combustion irreversibility. This paper presents an exergy-based scenario analysis of the crude preheat-train heat exchanger network (HEN) and fired heater in an industrial crude distillation unit at Azzawiya Oil Refining Company (ARC), Libya. A base case was validated using steady-state energy balances and then evaluated using component-level physical exergy balances. Two feasible …

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Immersive Virtual Reality For Enhancing Learning Of Transport Phenomena In Undergraduate Chemical Engineering, Muhammad Nawaz, Afiq Mohd Laziz, Kok Keong Lau, Bawadi Abdullah, Ratri Rahmawati Jun 2026

Immersive Virtual Reality For Enhancing Learning Of Transport Phenomena In Undergraduate Chemical Engineering, Muhammad Nawaz, Afiq Mohd Laziz, Kok Keong Lau, Bawadi Abdullah, Ratri Rahmawati

Platform: A Journal of Engineering

```python text = """As experiential learning becomes more central to engineering education, immersive technologies such as virtual reality (VR) are emerging as transformative tools for delivering abstract and spatially intensive subjects. This study investigates the effectiveness of a custom-designed VR for enhancing student understanding of transport phenomena (TP) concepts in undergraduate chemical engineering education. A mixed-method evaluation involving 160 students from the Chemical Engineering Department, Universiti Teknologi PETRONAS (UTP), Malaysia, was conducted using pre\x02and post-intervention surveys. Likert-scale ratings and word cloud analyses were used to assess perceived conceptual gains, usability, engagement, and perceived instructional value. Findings reveal that 85.6% of …

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Fines Migration Versus Mineral Dissolution In Co₂ Injectivity Impairment: A Critical Review And Conceptual Framework For Clay-Rich Sandstone Reservoirs, Umarov Shahzodbek Bakhromjon Ugl Jun 2026

Fines Migration Versus Mineral Dissolution In Co₂ Injectivity Impairment: A Critical Review And Conceptual Framework For Clay-Rich Sandstone Reservoirs, Umarov Shahzodbek Bakhromjon Ugl

Platform: A Journal of Engineering

Sustained injectivity is a controlling operational requirement for geological CO2 storage in deep saline aquifers because near-wellbore permeability loss can restrict injection rates, accelerate pressure build-up and reduce storage efficiency. In sandstone reservoirs containing reactive or mobile clay minerals, CO2-saturated brine may induce coupled geochemical and colloidal processes that cannot be interpreted through bulk porosity change alone. This review critically synthesises evidence on CO2-brine-rock interaction, clay mineral response, fines detachment, pore-throat restriction and injectivity impairment in sandstone systems. The reviewed literature indicates that mineral dissolution, secondary precipitation, salt precipitation, wettability alteration and fines migration can operate simultaneously, but their effects …

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Integrating Engineering Properties And Microstructural Behaviour In Lime-Stabilised Soils: A Review, Roslizayati Razali, Diana Che Lat, Hairol Anuar Haron, Siti Nur Aishah Mohd Noor, Nadia Zalikha Sailfullizam, Nur Syazwani Noor Rodi, Nor Azizah Che Azmi Jun 2026

Integrating Engineering Properties And Microstructural Behaviour In Lime-Stabilised Soils: A Review, Roslizayati Razali, Diana Che Lat, Hairol Anuar Haron, Siti Nur Aishah Mohd Noor, Nadia Zalikha Sailfullizam, Nur Syazwani Noor Rodi, Nor Azizah Che Azmi

Platform: A Journal of Engineering

Lime stabilisation is a widely used ground improvement technique for enhancing the engineering performance of problematic fine-grained soils. This review summarises recent studies on the mechanisms of lime stabilisation and their effect on the engineering properties and microstructural behaviour of stabilised soils. Lime treatment improves soil performance through cation exchange, flocculation, and pozzolanic reactions, resulting in the formation of cementitious compounds such as calcium silicate hydrate (CSH) and calcium aluminate hydrate (CAH). These reactions reduce plasticity and swelling while improving strength and durability. The review also discusses the influence of soil type, lime content, and curing period on the effectiveness …

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