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Articles 217321 - 217350 of 5211129
Full-Text Articles in Entire DC Network
Modified Best Channel Quality Indicator Scheduler For Heterogeneous Lte-A Network, Edidiong-Obong Ekpo, Kufre Udofia, Akaninyene Obot
Modified Best Channel Quality Indicator Scheduler For Heterogeneous Lte-A Network, Edidiong-Obong Ekpo, Kufre Udofia, Akaninyene Obot
The Journal of Engineering Research
In this paper, a Long-Term Evolution-Advanced (LTE-A) Modified Best Channel Quality Indicator (M-BCQI) Scheduler is proposed for enhanced cell edge throughput performance. The scheduling algorithm utilizes two time slots, each of 0.5 ms in length, with the First Time Slot (FTS) implemented with the Best Channel Quality Indicator (BCQI) algorithm has a CQI-focused Resource Block (RB) allocation mechanism, while the Robin (RR) algorithm is the mechanism used in the Second Time Slot (STS) for RB allocation. Vienna LTE system level simulator was used for the proposed scheduling algorithm assessment. The results obtained showed significant improvement, indicating 44% superior cell edge …
Development Of Selenium-Silica Nanocomposites By Sol-Gel Process Utilizing Three Different Reducing Agents And Its Characterization, Soumya Mukherjee
Development Of Selenium-Silica Nanocomposites By Sol-Gel Process Utilizing Three Different Reducing Agents And Its Characterization, Soumya Mukherjee
The Journal of Engineering Research
Nanocrystalline Selenium was synthesized within a silica matrix using a sol-gel method with high-purity SeO2, ethyl alcohol, distilled water, and TEOS (Tetraethyl orthosilicate). This process encapsulated the selenium dioxide in the silica matrix, which was then reduced at about 100°C using an oil bath. Three reducing agents were employed: acetone vapor, and sodium borohydride (NaBH4) and hydrazine (N2H4) in liquid form. DSC-TGA analyses of the precursor mixture determined the crystallization temperature for selenium nanoparticle formation within the matrix to be around 100°C. Post-heating phase analysis via XRD revealed …
Minimizing The Effect Of Integrating Wind Farms On Transmission Power Systems, Abdullah Al-Badi, Abdelsalam Elhaffar, Naif Albadi, Issa Aldarmaki, Ahmed Alsenani
Minimizing The Effect Of Integrating Wind Farms On Transmission Power Systems, Abdullah Al-Badi, Abdelsalam Elhaffar, Naif Albadi, Issa Aldarmaki, Ahmed Alsenani
The Journal of Engineering Research
Expanding the renewable energy sources usage in power systems will help the government meet its energy policy goals of lowering emissions, ensuring high power supply reliability, and promoting spot markets with high competitivity. However, due to the intermittent nature of these sources, this will necessitate the mitigation of network vulnerabilities. High wind energy penetration in the grid could have an impact on the system frequency, voltage, real and reactive power response, and power quality of the system. The main objective of this paper is to investigate how the integration of wind farms in the Jalan Bani Bu Ali (JBBA) area …
Comparison Of Seismic And Wind Actions On Medium To High-Rise Buildings In Muscat, Oman, Muhammad Bilal Waris, Khalifa Al-Jabri, Uhoud Al-Rawahi, Ali Alnuaimi
Comparison Of Seismic And Wind Actions On Medium To High-Rise Buildings In Muscat, Oman, Muhammad Bilal Waris, Khalifa Al-Jabri, Uhoud Al-Rawahi, Ali Alnuaimi
The Journal of Engineering Research
This study is a comparison of wind and seismic loads on medium and high-rise buildings in Muscat, Oman. It uses the proposed Omani Seismic Code and Eurocode EN1991 for seismic and wind calculations, respectively. Muscat falls under Zone-1 in the Omani seismic code and experience basic wind speed of 30 m/sec. The research investigates buildings with varying aspect ratios (1:1 and 1:2), heights (11, 15, and 19 stories), and structural layouts (frame only, core shear wall, and corner shear wall), using ETABS for structural analysis. The findings reveal that seismic actions are generally more significant than wind actions for buildings …
Improve The Conversion Efficiency And Electrical Output Of The Solar Pv System By Developing And Implementing A Cooling System, Alaa N. Abed, Naseer K. Kasim
Improve The Conversion Efficiency And Electrical Output Of The Solar Pv System By Developing And Implementing A Cooling System, Alaa N. Abed, Naseer K. Kasim
The Journal of Engineering Research
The performance of the grid-connected solar photovoltaic (PV) system in the present study is improved using cooling technology. This technology reduces the temperature of solar PV modules and thus increases their efficiency and lifespan. The current solar PV system has been installed in northern Baghdad in the city of Taji. This study included improving electrical power, conversion efficiency, and performance ratio. All of these improvements are achieved by cooling using water. The performance ratio (PR) and efficiency maximum values of the reference (unimproved) and improved solar PV modules are at 10:10 am at 88.30% & 96.30% and 13.4% & 14.6%, …
Influence Of Reclaimed Asphalt Pavement Aggregates On Strength And Durability Properties Of Concrete Mixes In Rigid Pavements, Rohit Vasudeva, Shashi Kant Sharma, M Abdul Akbar
Influence Of Reclaimed Asphalt Pavement Aggregates On Strength And Durability Properties Of Concrete Mixes In Rigid Pavements, Rohit Vasudeva, Shashi Kant Sharma, M Abdul Akbar
The Journal of Engineering Research
The use of Reclaimed Asphalt Pavement (RAP) aggregates in rigid pavements instead of conventional aggregates in Himalayan regions solves the problem associated with shrinking natural resources and dumping of wastes. This study studied the effect of partial replacement of conventional coarse aggregates by RAP in Dry Lean Concrete (DLC) mixes suitable for rigid pavements. A total of 114 specimens (cubical and cylindrical) were cast and tested for mechanical and durability properties as per ASTM and IS code guidelines, partially replaced with CRAP by 25%, 50%, and 75% by weight. The simultaneous effect of fly ash addition by partial replacement of …
Enhanced Biogas Production From Rice Husks And Okra Stalks By Co-Digestion With Ostrich Dung And Cow Manure, Huda Jassim, Amal Khalil
Enhanced Biogas Production From Rice Husks And Okra Stalks By Co-Digestion With Ostrich Dung And Cow Manure, Huda Jassim, Amal Khalil
The Journal of Engineering Research
In this study, two sides were studied. First one included single and combined pretreatment which were performed to treat milled rice husks compared to increase the production of biogas untreated rice husks. The other side included investigate the effect of two types of mixing: mixing rice husks and okra stalks using three mixing ratios inoculated with ostrich dung compared to rice husks and okra stalks inoculated with ostrich dung separately and mixing ostrich dung and cow manure using three mixing ratios with rice husks compared to using rice husks inoculated with ostrich dung and cow manure separately. The ten reactors, …
State-Of-The-Art Review On Utilization Of Fly Ash In Pavement Structures, Uneb Gazder, Md Arifuzzaman, Marwa Jazi, Madiha Abid
State-Of-The-Art Review On Utilization Of Fly Ash In Pavement Structures, Uneb Gazder, Md Arifuzzaman, Marwa Jazi, Madiha Abid
The Journal of Engineering Research
The use of fly ash in construction has been on the rise, yet its application in pavement construction remains relatively underexplored. This study addresses this gap by critically reviewing 70 years of research on fly ash usage in pavement engineering, offering valuable recommendations. Class 'C' fly ash is employed for soil stabilization, while class 'F' is used in concrete. In both flexible (asphalt) and rigid (concrete) pavements, fly ash primarily functions as a filler material. Fine ash, owing to its fineness, enhances asphalt concrete by reducing void ratios and water sensitivity, as well as easing subgrade compaction while increasing compressive …
Effects Of Long-Term Soaking On The Load-Bearing Capacity Of Bitumen-Treated Saline Sabkha Soil Subgrade, Fahad A. Al-Otaibi
Effects Of Long-Term Soaking On The Load-Bearing Capacity Of Bitumen-Treated Saline Sabkha Soil Subgrade, Fahad A. Al-Otaibi
The Journal of Engineering Research
This study delves into the potential of using modified sabkha soil, a low-quality material, as a cost-effective solution for road construction in Kuwait, a country grappling with resource limitations. The research evaluates the effects of adding different percentages of bitumen (0%, 4%, 8%, and 10%) to sabkha soil samples, specifically looking at their load-bearing capacity under long-term soaking conditions. The findings indicate that adding up to 8% bitumen enhances the soil's geotechnical properties and its load-bearing capacity. However, any further addition leads to a decline in these properties. Importantly, the soil's load capacity shows significant improvement under soaked conditions. These …
A Quick And Comprehensive Method For Determining Static Atc With Nrs And Vft, Mostafa Eidiani
A Quick And Comprehensive Method For Determining Static Atc With Nrs And Vft, Mostafa Eidiani
The Journal of Engineering Research
Electricity market players prioritize available transfer capability (ATC) as an attractive solution. Market participants can gain a financial advantage through accurate and fast ATC solutions. In order to provide a suitable and valuable solution, we use differential load flow equations. A dynamic system's entire time-domain trajectory can be solved by this method, along with a fictional time-domain differential equation. This article uses Newton-Raphson-Seydel instead of Newton-Raphson, which can also be used to determine voltage stability. A variable frequency transformer (VFT) was used in this study to increase and control transmission power. A 50% time saving on small systems was achieved …
Hazard And Operability Study Analysis As A Semi-Automatic Approach, Soufyane Boutadjine, Mourad Korichi, Ilyas Sellami
Hazard And Operability Study Analysis As A Semi-Automatic Approach, Soufyane Boutadjine, Mourad Korichi, Ilyas Sellami
The Journal of Engineering Research
Risk analysis is crucial in industrial conception. HAZOP is the top risk analysis method for the oil and gas sector. This paper presents a semi-automatic method to address HAZOP's limitations and produce automatic results. The method uses a knowledge base, initially filled with gas liquefaction data, and is enhanced with subsequent case studies. An inference engine processes this data to conduct a HAZOP study. Propagation rules identify potential deviation paths, enabling risk analysis and consequence prediction based on the knowledge base. This method uniquely illustrates deviation paths and introduces nodes along these paths for further study. The findings derive from …
Chemical Risk Assessment And Prevention Action Plan Related To Petroleum Production. Case Study Of Laboratory And Storage Units In An Algerian Oil And Gas Company, Samia Chettouh, Saleh Arif
Chemical Risk Assessment And Prevention Action Plan Related To Petroleum Production. Case Study Of Laboratory And Storage Units In An Algerian Oil And Gas Company, Samia Chettouh, Saleh Arif
The Journal of Engineering Research
Chemical risk is considered one of the most frequent risks in the workplace, affecting the safety of workers continuously exposed to chemical substances. In addition, it can have an environmental impact and cause an explosion when unacceptable conditions are met. To know the effects of chemical risks and how to prevent them, this study is proposed, the main objective of which is the evaluation of chemical hazards and the proposal of an action plan to avoid this kind of risk in industrial companies. Our case study focused on the crude oil production company " PERTAMINA" using the SEIRICH software. The …
A Novel Demulsifier Used To Separate Water From The Emulsion, Mohammed Massoud Samba, Mahdi Almakki, Yiqiang Li, Najlaa A. Rafaa, Enas Fessatwi
A Novel Demulsifier Used To Separate Water From The Emulsion, Mohammed Massoud Samba, Mahdi Almakki, Yiqiang Li, Najlaa A. Rafaa, Enas Fessatwi
The Journal of Engineering Research
Recently, there has been interest in using chemical demulsifiers to separate the water phase from crude oil emulsion. Separating the water from the emulsion is crucial before transportation and refining to avoid complications from the water phase. This research introduces a novel chemical demulsifier, Poly (AAc-co-AAm) hydrogel, synthesised at Sebha University. Its characteristics were examined using the Fourier Transform Infrared Spectroscopy test (FTIR). Its efficiency was tested against commercial demulsifiers (Emulsotron and Dmo-66813) used in some Libyan oil fields. The chosen concentrations for Poly (AAc-co-AAm) were 0.5%, 1%, and 2%, while commercial demulsifiers were tested based on the standard method …
Efficiency Enhancement Of Photovoltaic Solar Cells Using Metamaterials Absorbing Screen, Haitham Al Ajmi, Mohammed Bait-Suwailam, Mahmoud Masoud
Efficiency Enhancement Of Photovoltaic Solar Cells Using Metamaterials Absorbing Screen, Haitham Al Ajmi, Mohammed Bait-Suwailam, Mahmoud Masoud
The Journal of Engineering Research
This paper proposes a novel technique for the efficiency enhancement of photovoltaic (PV) solar cells using metamaterials absorbing screens. This kind of engineered material comprises resonant metallic rings that are printed on a host low-loss dielectric substance and made periodic in a two-dimensional lattice. The absorbing screen has been carefully designed, and its retrieved effective constitutive parameters, effective electric permittivity ϵeff and effective magnetic permeability µeff, are integrated within a numerically modelled amorphous-Silicon-based PV solar cell structure as an impedance matching layer. Such arrangement will greatly achieve matching between the effective impedance of the composite solar cell …
Design And Mixing Performance Of Passive Micromixers: A Critical Review, Afzal Husain, Asharul Islam Khan, Wasim Raza, Nabeel Al-Rawahi, Nasser Al-Azri, Abdus Samad
Design And Mixing Performance Of Passive Micromixers: A Critical Review, Afzal Husain, Asharul Islam Khan, Wasim Raza, Nabeel Al-Rawahi, Nasser Al-Azri, Abdus Samad
The Journal of Engineering Research
This study extracts and reports notable findings on passive micromixers by conducting an exhaustive review of designs, their features, and mixing performance. The study has covered the relevant articles on passive micromixers published from 2010 to 2020. The analysis of filtered and selected articles sums up passive micromixers into four categories: designed inlets, designed mixing-channel, lamination-based, and flow obstacles-based. The prominent mixing channel categories identified in the study are split-and-recombine (SAR), convergent-divergent (C-D), and mixed (SAR, C-D, and others). Moreover, differences in mixing channel designs, number of inlets, and evaluation methods have been used in comparing the mixing performance of …
Exploring The Impacts Of Covid-19 Pandemic On Oman's Electricity Sector, Mohammed Hamdan Albadi, Abdullah Al Badi, Sultan Al Rawahi, Maktoum Al Hosani, Malik Al Shabibi
Exploring The Impacts Of Covid-19 Pandemic On Oman's Electricity Sector, Mohammed Hamdan Albadi, Abdullah Al Badi, Sultan Al Rawahi, Maktoum Al Hosani, Malik Al Shabibi
The Journal of Engineering Research
This article reviews the recent trends of Oman's electricity sector before the COVID-19 pandemic outbreak. The impacts of the pandemic on the Main Interconnected System (MIS) of Oman were analyzed using hourly load data. The analysis shows that the MIS demand declined as a result of the decrease in economic activities during the lockdown. In addition, the MIS demand experienced temporal and geographical variations: the former is demonstrated by a shift in peak demand hours, while the latter is represented by a reduction in Muscat's urban areas' load compared with those of other areas.
Exploring The Anti-Wear And Extreme Pressure Lubricating Performance Of Jatropha Oil Modified With Nano-Additives And Garlic Oil, Zahid Mushtaq, M. Hanief
Exploring The Anti-Wear And Extreme Pressure Lubricating Performance Of Jatropha Oil Modified With Nano-Additives And Garlic Oil, Zahid Mushtaq, M. Hanief
The Journal of Engineering Research
It is imperative to emphasize the wear-reducing and load-sustaining abilities of the lubricating oils, as they are an essential part of their operation. In this study, the anti-wear and extreme pressure (EP) performance of Jatropha oil was explored. The investigation was executed on a 4-ball tester machine according to ASTM-D-4172 and D-2783 standards. Nano-sized Molybdenum disulfide and graphene were added to the base oil, whose addition reduced the wear on the test balls but failed to improve the EP properties. However, the addition of Garlic oil elevated the EP properties of the base oil. The Last Non-seizure load and weld …
Yearly Improvement Of Grid-Connected Solar Pv System Parameters By Planar Concentrators, Alaa Najem, Naseer K. Kasim, Hazim H. Hussain
Yearly Improvement Of Grid-Connected Solar Pv System Parameters By Planar Concentrators, Alaa Najem, Naseer K. Kasim, Hazim H. Hussain
The Journal of Engineering Research
Planar concentrators are used in the current manuscript to improve the solar PV system parameters (electrical energy, array yield, and solar irradiation). Additionally, study the temperature (both the ambient temperature and the temperature of the PV modules), performance ratio, and efficiency. The current PV system is situated at Al-Taji town in Baghdad. These improvements are achieved by using planar concentrators to increase solar radiation (made of aluminium metal). The results demonstrated a 21% increase in the yearly average energy output for improved solar PV modules. The improved solar PV modules' average yearly array yield increased by 20.6%. Compared to the …
Comparing Dispersion Compensation Methods For 120 Gb/S Optical Transmission: Pre, Post, And Symmetrical Schemes, Ammar Odeh
The Journal of Engineering Research
One of the major factors that limit the performance of an optical fiber communication system is
dispersion. In order to get a high transmission range with high data rates, techniques must be in place to compensate for the dispersion caused by fiber nonlinearity. Dispersion Compensating Fiber (DCF) and Fiber Bragg Grating (FBG) are the trending dispersion compensation techniques in optical fiber communication. The use of DCF and FBG as a method of dispersion compensation can notably enhance the overall performance of the system. Broadening is a function of distance as well as the Dispersion parameter (D). The dispersion parameter is …
Dynamic Impact Response Of Nanosized Precipitates Bearing Waspaloy, Harrison Onovo, David Ehigie Esezobor, Muideen Adebayo Bodude
Dynamic Impact Response Of Nanosized Precipitates Bearing Waspaloy, Harrison Onovo, David Ehigie Esezobor, Muideen Adebayo Bodude
The Journal of Engineering Research
Dynamic response of nanosized precipitates bearing (NPB) Waspaloy, a class of superalloy, is crucial to design structural components for critical rotating applications and other severe dynamic impact predisposed applications. The focus of this study is, therefore, to investigate the compressive dynamic behaviour of NPB Waspaloy at a high strain rate under various deformation conditions. The technique of modified split Hopkinson pressure (MSHP) bar was implemented through impact deformation of Waspaloy under wide-ranging deformation temperatures (-180 - 750 oC) and strain rates of (4*103 - 7.5*103 s-1). The outcomes of the experiments divulge how to flow …
A Structured Reliability And Maintainability Assessment Model: An Application To High Voltage Motors, Majdi M. Obaid, Qadeer Ahmed
A Structured Reliability And Maintainability Assessment Model: An Application To High Voltage Motors, Majdi M. Obaid, Qadeer Ahmed
The Journal of Engineering Research
Motors are one of the vital equipment and generally the higher in numbers in oil and gas processing facilities. The primary function is to drive the process equipment such as compressors, fans, pumps etc. Unreliability of the motors is a threat to safety but also to production loss and high operating expenditure. Motors experience higher failure rates and maintenance costs with age due to lower focus during useful life periods. In order to properly address the long-term reliability and maintainability of the motors and associated subsystems, this paper aims to propose a structured methodology and set of tools to ensure …
A Comparison Of Oman Seismic Code With International Counterparts Based On Regional Seismic Hazard, Muhammad Bilal Waris, Khalifa Al-Jabri
A Comparison Of Oman Seismic Code With International Counterparts Based On Regional Seismic Hazard, Muhammad Bilal Waris, Khalifa Al-Jabri
The Journal of Engineering Research
Oman Seismic Code (OSC) was developed in 2013 to provide guidelines for seismic analysis and design of buildings in the Sultanate of Oman. Prior to its development, specifications of Uniform Building Code 1997 (UBC) and International Building Code 2006 (IBC) were used. This study compares base shear, lateral force distribution, and effective storey drift obtained from the three seismic codes using equivalent static load and response spectrum analysis methods. Reinforced concrete buildings with 25m x 40m plan having columns at 5m spacing are used; 3-, 6-, 13- and 19- storeys are considered having height of 10m, 19m, 40m and 58m, …
Modeling And Testing Of A Maintenance Project Using Simphony: Case Study, Mubarak Khamis Al Alawi, Mohammed Al Shahri
Modeling And Testing Of A Maintenance Project Using Simphony: Case Study, Mubarak Khamis Al Alawi, Mohammed Al Shahri
The Journal of Engineering Research
Unlike building a new project, the maintenance and rehabilitation of an existing project are complex. The complexity is driven by different factors such as limited access to the site, limited working hours, restricted storage area, a limited number of allowed crews to work simultaneously, etc. Considering all of these factors is essential for construction process planning. Hence, testing the maintenance project under different project scenarios will help to identify the optimum resources configuration. In this paper, we present a case study of a maintenance project located in Al Khodh, Oman. It is required to model and simulate the maintenance operation, …
Investigation Of Noise Exposures, Perception, And Health Effects In Different Microenvironments In A University Community, Patrick Amoatey, Issa Al-Harthy, Khalifa Al-Jabri, Abdullah Al-Mamun, Mahad Baawain
Investigation Of Noise Exposures, Perception, And Health Effects In Different Microenvironments In A University Community, Patrick Amoatey, Issa Al-Harthy, Khalifa Al-Jabri, Abdullah Al-Mamun, Mahad Baawain
The Journal of Engineering Research
This study aims to assess noise levels in selected outdoor and indoor microenvironments in a University community in Oman. The perception of noise levels within the Sultan Qaboos University campus was investigated through a survey study. Also, the effect of exposed noise levels on annoyance and sleep disturbance were predicted including their potential risk on cardiovascular health. Among all the measured parameters, it was found that outdoor (41.6%-50%) and indoor (38.5%-46.2%) microenvironments have exceeded the critical levels of 55 dB during morning and afternoon periods. The respondents (698 people) identified traffic and indoor building-related activities as the main sources of …
Productivity Factors In Construction Smes In Oman- Exploration Study, Mubarak Khamis Al Alawi, Amwaj Al Abdali, Shadi Altawil
Productivity Factors In Construction Smes In Oman- Exploration Study, Mubarak Khamis Al Alawi, Amwaj Al Abdali, Shadi Altawil
The Journal of Engineering Research
Construction projects are unique and influenced by many external and internal factors hindering the efficiencies of operations. Different construction companies may have different influencing productivity factors depending on the company’s scale. Large construction companies have better resource management systems than the construction small and medium enterprises (SME). The construction SMEs work in small scale projects, and the amount and type of the required resources are different from the large construction companies. Therefore, identifying the factors affecting construction productivity is essential to determine the best action to avoid any unforeseen productivity reduction. This study aims to rank the most influencing productivity …
Recent Cnn-Based Techniques For Breast Cancer Histology Image Classification, Arunadevi Karuppasamy, Abdelhamid Abdesselam, Hamza Zidoum, Maiya Al-Bahri
Recent Cnn-Based Techniques For Breast Cancer Histology Image Classification, Arunadevi Karuppasamy, Abdelhamid Abdesselam, Hamza Zidoum, Maiya Al-Bahri
The Journal of Engineering Research
Histology images are extensively used by pathologists to assess abnormalities and detect malignancy in breast tissues. On the other hand, Convolutional Neural Networks (CNN) are by far, the privileged models for image classification and interpretation. Based on these two facts, we surveyed the recent CNN-based methods for breast cancer histology image analysis. The survey focuses on two major issues usually faced by CNN-based methods namely the design of an appropriate CNN architecture and the lack of a sufficient labelled dataset for training the model. Regarding the design of the CNN architecture, methods examining breast histology images adopt three main approaches: …
A Tidal Flow Model Of The Western Coast Of Libya, Talal Etri, Ahmed F. Abugdera, Abdelrahman Elata
A Tidal Flow Model Of The Western Coast Of Libya, Talal Etri, Ahmed F. Abugdera, Abdelrahman Elata
The Journal of Engineering Research
This paper presents the hydrodynamics on the western coast of Libya. The investigated area, which is a part of the Mediterranean Sea, is one of the most critical and active coastal region in the country. A 2Dh process-based model for flow based on the Delft3D modelling system from Deltares is constructed for the study area. Extensive field data concerning the tidal constituents were used. The flow model that is necessary to understand the hydrodynamics of the area was calibrated and validated using the field measurements. In this paper, only the water levels and tidal components for the astronomical tide are …
Investigation Of The Thermal Comfort And Productivity In Japanese Mixed-Mode Office Buildings, Supriya Khadka, Mishan Shrestha
Investigation Of The Thermal Comfort And Productivity In Japanese Mixed-Mode Office Buildings, Supriya Khadka, Mishan Shrestha
The Journal of Engineering Research
This study investigates the overall comfort and productivity of Japanese office workers in mixed-mode office buildings. The indoor thermal environment is adjusted using the air-conditioning in Japanese office buildings to maintain thermal comfort and productivity. Thus, it is necessary to research thermal comfort and productivity to understand how occupants prepare themselves to be at a comfortable temperature and perform their daily tasks under mixed-mode (MM) and free-running (FR) modes. Environmental parameters such as air temperature, relative humidity, and so on were measured in 17 Japanese office buildings with the help of digital instruments, and thermal comfort transverse surveys were conducted …
Bi-Optimization Of Durability And Rheological Performance Of Oil Well Cement Slurry Using Locally Sourced Extender, Kazeem Kolapo Salam, A. O. Arinkoola
Bi-Optimization Of Durability And Rheological Performance Of Oil Well Cement Slurry Using Locally Sourced Extender, Kazeem Kolapo Salam, A. O. Arinkoola
The Journal of Engineering Research
Bentonite used during drilling and cementing operations in Nigeria are imported into the country despite the availability of this raw material, which will increase the Gross Domestic Products (GDP) of this country if properly processed and utilized instead of imported bentonite. This investigation evaluated the performance of three selected Nigerian bentonites sourced from the South-Western part of Nigeria for oil well-cementing operation. The raw and beneficiated samples from each location were prepared and characterized using X-ray Fluorescence (IVT-20 XRF) to determine the elemental composition of each sample pre and post beneficiation. The beneficiated sample with properties close to that of …
Users’ Assessment Of Personal Fans In A Warm Office Space In Brazil, Maíra André, Carolina Buonocore, L. De Castro, R. Lamberts
Users’ Assessment Of Personal Fans In A Warm Office Space In Brazil, Maíra André, Carolina Buonocore, L. De Castro, R. Lamberts
The Journal of Engineering Research
The use of personal fans allows improving thermal comfort and energy savings in warm office spaces. This is due to individual adjustment and extended indoor temperature acceptability. However, to achieve that, the usability of fans must be assured. Therefore, an experiment with 40 people of various age groups was carried out to assess four types of fans, one of which is an evaporative cooling device. The goal was to find out which criteria should be used for selecting a fan to implement in an office space. Results show that airflow sensation and speed adjustment are considered the most important, although, …