2024-03-28T13:23:52Z
https://bfemu.journals.ekb.eg/?_action=export&rf=summon&issue=15376
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
3
Analysis and Optimizing the Performance of Photovoltaic Power Systems under Partial Shading Condition.
Sahar
Kaddah
EL-H.
Abd-Raboh
K.
Abo-EL-EZ
S.
Diab
Growing shortage of fossil fuels and increasing emissions of CO2 make it a must to increase relying to the renewable energies for meeting the growing needs of consumers. In Egypt, the availability of solar energy put photovoltaic (PV) systems among the most important of these energies. The performance of Photovoltaic (PV) systems is deviated severely under partial shading condition (PSC).And this deviation is not determined in straight forward way, since it is not depending on the shaded area only. In this paper we have been present a simple methodology to evaluate accurately the characteristics (c/cs) of large and small scales of PV systems when one cell or group of cells in different sub-modules are partially shaded based on well-established algorithms. We enlarge this methodology to analysis then optimize the performance of PV arrays under PSC in different criteria for different series-parallel configurations of modules inside the array, with and without different numbers of bypass diodes ( ) and using the shadow length compensation algorithm which prevents the mutual shading between arrays through adjusting the tilt angle. A Matlab simulation is done to verify the theoretical analysis for Al-Arish at 17th January which is the average day in January. We found that the impact of increasing the number of Dby to optimize the performance of PV systems under PSC depends on the shading ratios. Also we found that the harmful impact of PSC on PV systems depend on the number of sub-modules under PSC, the length of strings and number of strings connected in parallel. This methodology should be applied for optimizing and sizing PV systems which are partially shaded.
2020
07
08
1
16
https://bfemu.journals.ekb.eg/article_101468_ab181458c5002d62c9ae0068d50d7fca.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
3
Design and Implementation of a Fuzzy Logic PWM Charge Controller for the Photovoltaic Systems.
Eid
Gouda
A.
Abdelhaleim
Saad
Eskander
Charge controller is the device which is connected between the photovoltaic (PV) modules, DC batteries and loads. This paper proposes the design and implementation of a charge controller which is capable to protect the lead acid batteries in the PV system from overcharge and undercharge states. Moreover, this charge controller is designed to make the battery voltage near the PV voltage at the maximum power point (MPP) for the PV modules. Also, the designed charge controller uses the fuzzy logic Pulse Width Modulation (PWM) control, in order to make use of the full capacity of the lead acid batteries in the system. Therefore, this proposed design improves the reliability of the PV system and reduces its total cost.
Overcharge
Undercharge
MPP
PWM
Fuzzy Logic
Lead Acid Battery
2020
07
08
17
27
https://bfemu.journals.ekb.eg/article_101472_123698c8b5d00200f4182ba66fd80810.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
3
Modeling the Performance of the Photovoltaic (PV) Water Pumping Systems.
Eid
Gouda
Shahad
Shakir
Mohamed
Elsayes
The research suggests a mathematical model which represents the performance of photovoltaic water pumping system. The suggested system is considered one of the best used systems for producing clean electric power that is necessary for operating water pumps. The proposed system has been extrapolated by using main mathematical equations which expressing the performance of pumping system's components which are represented the photovoltaic cells and the group of the water motor-pump. A Mat Lab/Simulink used to construct a same numerical model. The extracted results are the same from both model and these results approved their validity. The photovoltaic water pumping system includes permanent magnet DC motor (PMDM) that is fed directly by the photovoltaic cells. And the water pump used in this purposed system is (centrifugal) type. The mathematical models can be used generally for any place which their solar characteristic is known to determine the amount of water that can be pumped to the used pumping system. And the system was applied at a village near Cairo. The suggested model can be used in determining the components of the suggested system and determining the amount of water and the size of tank that will be used for this purpose.
PV model
Pump set model
PMDM
Minimum water tank design
2020
07
08
28
35
https://bfemu.journals.ekb.eg/article_101473_a25358f7550c584579c925dfbe1216d8.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
3
Solving Multi-Area Economic Dispatch with Multiple Fuels Using Hybrid Optimization Technique.
Ehab
Elattar
Multi-area economic dispatch (MAED) deals with the optimal dispatch of multiple areas. MAED with tie line constraints, transmission losses, multiple fuel option and valve point effects is considered as a large scale non-linear optimization problem. An accurate optimization method to solve this problem is of great interest. However the conventional particle swarm optimization (PSO) has been applied to solve many optimization problems with success, it suffers from some drawbacks. Therefore, chaotic PSO (CPSO) has been used to treat these drawbacks. Choosing the parameters of CPSO has a great effect on its performance. So, a hybrid CPSO and genetic algorithm (HCPSOGA) method is employed in this paper to solve this problem. The hybrid method is derived by combining CPSO and GA where GA is used to optimize the parameters of CPSO. To show the effectiveness of the hybrid method, two test systems are used. The results show the superiority of the hybrid method over some published methods based on same test systems.
Economic dispatch
multi area economic dispatch
multiple fuels
chaotic particle swarm optimization
Genetic Algorithm
2020
07
08
36
47
https://bfemu.journals.ekb.eg/article_101474_5bc6fa5eae96ef5e180c5705ca8837e8.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
3
Strain rate effect on Deformation of pure Al in Equal Channel Angular Pressing.
Maher
Mohamed
Nader
Zaafarani
Chahinaz
Saleh
Abd El-Fattah
Khourshid
The role of the rate of severe plastic deformation (SPD) during equal-channel angular pressing (ECAP) on microstructure and strength are studied. ECAP was performed at room temperature to refine grain size of pure Al of square cross-section. The examination of the microstructure has been undertaken using a scanning electron microscope. The mechanical properties of the ECAP processed material are investigated. The tests show that the hardness increase is affected by the amount of the strain rate on pure Al. Also, it was observed that a lower strain rate produces a homogeneous microstructure with equiaxed grains more quickly than with higher strain rate and the yield strength increases up to three times.
Equal channel angular pressing
ECAP
Pure Aluminum
hardness
Compression rate
2020
07
08
1
8
https://bfemu.journals.ekb.eg/article_101477_e9a56273c70ae5fa9cf0ef70912bd7b1.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
3
Effect of Steam Injection on the Performance of Heavy-Duty Gas Turbines.
Mohamed
Abd El-Fattah
Mostafa
Awad
Emad
Elnegiry
A gas turbine performance prediction tool has been implemented using a simulation software package to accurately predict the performance of SGT5-4000F heavy-duty gas turbines. Comparing the results obtained from this simulation with data collected from the field, a significant agreement between them is found within an acceptable tolerance of about 4%. The model has been built to work at both steady state and transient combining the control protocols, thus achieving the maximum allowable output power with various operating parameters. This study aims to use the implemented model to investigate the effect of Steam Injection Gas Turbine cycle (STIG) as well as the change in ambient temperature on the performance of the unit in terms of both output power and efficiency. The results indicate a significant improvement in performance using this specific technology.
Gas turbines
steam injection
Aspen Hysys
STIG
turbine performance
2020
07
08
9
17
https://bfemu.journals.ekb.eg/article_101479_d7ca4356ac9928c92699000f098b66ce.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
3
Investigation of Experimental Solar Chimney Output Parameters Behavior.
Aly
Elzahaby
Elsayed
Elsayed
Hosam
Nasef
A solar chimney pilot plant as a power conversion unit has been designed, built and tested in Tanta with 24 m chimney height and 1600 m2 collector area. Temperature distributions for transparent cover, air inside the collector, absorber surface and two points in the soil at different depth from the surface have been measured along the radius of the collector at different distances from the center of the collector. Air velocity and temperature at chimney entrance also have been measured. Temperature of transparent cover, air inside the collector and absorber surface are affected directly by solar radiation and they reach to their peak with peak of solar radiation, while temperature of soil at upper layer reaches to its peak with sunset and the temperature of soil at lower layer does not change during measuring period but these temperatures have different values at different measuring position along the radius of the collector. Air velocity increases with increasing temperature difference between air at chimney entrance and the ambient which reaches to a mean value of 5 m/s in the period between 8 AM and 4 PM at mean temperature difference of 23.5oC and mean solar radiation of 812 W/m2.
2020
07
08
18
26
https://bfemu.journals.ekb.eg/article_101481_5c7ae67ba4db60a232f17848d2ebebcb.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
3
A Framework for Performance Evaluation of Industrial Organization.
M.
Abou-eleaz
M.
El-Baz
Tawfik
Elmidany
In a global economy, competitive and dynamic environment, Supply Chain Management (SCM) is a key strategic factor for increasing organizational effectiveness. Many organizations have not succeeded in maximizing their supply chain's potential because they have not developed the required performance evaluation metrics and measures needed to integrate their supply chain to maximize effectiveness and efficiency. This search is directed to develop a framework capable of evaluating the organization performance and introduce efficient performance measurement system enabling organization management to control, monitor, and improve the organization performance in order to achieve their strategic goals. Only when the requirements and constraints of the market place are understood an enterprise can attempt to develop a strategy that will meet the needs of both the business success and the end customer.
Performance measurement
Supply chain management
SC PE
Framework
2020
07
08
27
43
https://bfemu.journals.ekb.eg/article_101486_7b151e2597e11ca7cd3877c51a5aa5f0.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
3
Desalination Investigation using Direst Contact Membrane Distillation.
Aly
Elzahaby
A.
Kabeel
M.
Basuony
Ayman
Abd Elbar
The purpose of the present research is to carry out an experimental and theoretical investigation for salt water desalination using tubular direct contact membrane distillation. The effect of operating parameters on the unit performance was studied. These parameters include feed water inlet temperature, feed water flow rate, salt concentration and cooling water temperature. System thermal efficiency and gain output ratio (GOR) are also evaluated. The investigated range was, 70oC for inlet feed water temperature, from 15 to 20 L/min for feed water flow rate, from 0 to 40 g Nacl/L water for feed water salt concentration, from 20 to 56 °C for the inlet cooling water temperature, and from 15 to 20 L/min for cooling water flow rate. Maximum productivity, daily efficiency, and Gain output ratio (GOR) of the system reach 40.587 kg/day, 64.88%, and 0.624 respectively. Finally, a good agreement has been found between the present numerical results and experimental results
2020
07
08
44
54
https://bfemu.journals.ekb.eg/article_101487_4df330be2fa584f64da29573f8ebd3b0.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
3
A Study on Spiral Bevel Gears with Circular Arc Tooth Profile.
Tawfik
Elmidany
Ibrahim
Elewa
Mostafa
El-Bahloul
The aim of this paper is to study the spiral bevel gears with new tooth profile, named circular arc. This profile will guarantee higher load carrying capacity, higher power transmission efficiency, and longer operating life. A mathematical model is proposed for spiral bevel gears having circular arc tooth profile, where all geometry calculations are performed using MATLAB software package. The mathematical model includes spiral bevel gears for both Gleason and Klingelnberg manufacturing systems. The solution of the single meshing constraint equation for gears with intersecting axes is taken into consideration for gear geometry calculations. The proposed mathematical model is then validated using CATIA software package through solid modelling of different gear designs. These trials included different values of the various design parameters of spiral bevel gears to ensure that the mathematical model is valid for different design cases. This validation is completed with an interference check step performed through dynamically simulating meshing between a pair of gear set through CATIA software package.
Spiral bevel gears
Circular arc tooth profile
Gleason
Klingelnberg
2020
07
08
55
65
https://bfemu.journals.ekb.eg/article_101488_92571ebd0284a75c591df399d529c22a.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
3
Soil Protection from Lead Contaminant Using Sheet Pile or Isolation Methods.
Weam
Abdulwahhab
Ahmed
El Nimr
Kasem
Abdul Wahab
Ayman
Ibrahim
The contaminants which result from different types of agricultural and industrial wastes are considered the source of soil pollution. Lead contaminants which may cause irreparable danger while entering the food chain. This research presents an application of numerical models in order to investigate the transport process of lead through soil layers. Two software products, SEEP/W and CTRAN/W, are used to analyze the lead contaminant transport. The behavior of lead transport through layered soil is tested without using a method of control and with the usage of two methods of control. These are sheet pile method or isolation method. They are used to minimize the impact on the environment. The study results show that the sheet pile method is considered to be the most economically effective and the most flexible method in protecting the soil.
2020
07
08
1
7
https://bfemu.journals.ekb.eg/article_101490_6e67cc2a54bce1b844dc0176ad6882aa.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
3
Value Engineering Methodology in the Management of Existing Projects – Case Study of “Mansoura University Hotel”
Ahmad
Mohammed
Kasem
El Alfy
Sherif
Sheta
The main objective of this study is to reach a better relationship between the performance and the cost of any project. The Value Engineering characterized by a distinctive methodology for studying, analyzing and evaluating the projects; As work out with this study aims to raise the value of the project through the formulation of a valuable compromise curriculum works on measuring the special needs of users of the project and linked to cost in order to delete the unnecessary cost to achieve the balance between the performance of the project and its cost, thereby increasing its quality and value. The work plan of the Value Engineering is summarized, first, in gathering information about the project from documented sources, second, the functions of project are being analysed hence the performance is linked to the cost by classifying those functions, third, the team work moves to the phase of generating innovative ideas, proposals and alternatives of the project achieve the same performance and at a lower cost and delete the unnecessary functions, fourth, those alternatives will be evaluated, tested the best of them and delete the inappropriate ideas. The study of the requirements of users’ project is the main step to create the vacuum compatible with the needs of these users through the ruling values of the society. Functionality is determined to design this valuable project through the integration of structural, cultural, natural and interactive functions. Finally it can be concluded that linking the architectural study of the project with the psychology of the user to design spaces is humanly and functionally fit with the current and the future user.
value engineering
Cost effectiveness
Usesr’s needs
Project Management
2020
07
08
8
17
https://bfemu.journals.ekb.eg/article_101492_c0b7cb5a08f58ab7b841450e70b59e20.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
3
Architectural Forming and Economic Analysis of BIPV System for the Faculty of Engineering Buildings in Mansoura University.
Mayada
ELsherbeni
Sherif
Sheta
Saad
El Sayed
Recently, we have become more conscious about the impact of the industrial and technological revolution on the environment and human health which is basically due to the use of fossil fuel. In the development of energy sources in Egypt for the 21st century, it is necessary to replace by solar energy as one of the most promising and available renewable energy sources. Egypt is considered one of the solar belt countries with high intensity of direct solar radiation from north to south which provides a variety of solar energy applications. In Egypt existing building sector is responsible for use of large amount of energy for lighting, heating and cooling. As the amount of existing buildings is much higher than the number of buildings being built, while many of these existing buildings need improvements. This provides an opportunity to use photovoltaics (PVs) integration technologies to reduce primary energy usage and greenhouse gas emissions. At the moment, PVs technologies are available in relatively competitive prices; solar radiation is converted into electricity providing a cleaner, environmentally friendly alternative to reduce the environmental impact of buildings. The main reason for these technologies to stay unpopular is the lack of good architectural quality that meets the desired design considerations. The main aim of this paper is to pave possible ways for architects and engineers to use the building integrated photovoltaic (BIPV) systems with innovative approaches which can serve the dual function of emphasis on the architectural expression and power generation. Introduce a model of architectural forming and economic analysis of BIPV system for an existing campus building in Egypt (the Architectural Department in the Faculty of Engineering in Mansoura University). This will encourage the responsible authorities and operators of existing buildings in Egypt to implement sustainable practices and reduce the environmental impacts of buildings over their functional life cycles.
solar energy
Photovoltaic
Building Integration
BIPV
life cycle cost
2020
07
08
1
10
https://bfemu.journals.ekb.eg/article_101512_335a6bf540f52d5b469df02f79a4ab6d.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
3
Toward Sustainable Design Solutions for Existing Campuses in Egypt: Case Study Mansoura University.
Khalid
Abdalla
Sherief
Sheta
Ahmed
EL-Maidawy
Coinciding with the increased risk of negative impacts of the built structure on the environment caused by depletion of natural resources and increasing energy costs, it is argued that the main challenge facing the urban sector is to achieve sustainable development with less energy consumption, optimized utilization of natural resources and materials, more renewable energy dependence, increased levels of water conservation, and ensured safe disposal of pollutants. Higher education institutions and universities can practically provide the most influential ideas and concepts to the society towards transition to sustainable thinking and increased awareness of the importance and application of sustainability, not only through curricula and academic research, but also through positive environmental practices at the campus buildings that should generally aim to minimize negative impacts on the environment. This study aims to benefit from the successful practices and experience of sustainability at existing universities on global and regional scales. It provides comparative analysis of two universities: 1) University of Maryland in the USA; and 2) King Abdullah University of Science and Technology in Saudi Arabia. Each of the case studies represents leadership on selective aspects of sustainability practices on campus. Sustainable strategies are grouped to formulate sustainable design strategies for campuses, and an application is performed on Mansoura University to examine its sustainability range and potentials. The paper concludes with applied recommendations to transform Mansoura University to a sustainable campus.
الاستدامة البيئية
المباني الجامعية
2020
07
08
11
22
https://bfemu.journals.ekb.eg/article_101513_4fbc2e55faab857517b5b1d61a3f6b4a.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
3
Thermal Analysis of Residential Buildings through Simulation Software (Study the Relationship between Form and Energy Consumption on New Mansoura City).
Medhat
Samra
Alaa
El-Eashy
Mohammed
Alazab
With the increasing horizontal expansion of the Egyptian Urban in some medium-sized cities turned into Overcrowding stage due to lack of building area, Government moving to Build new cities to reducing Overcrowding in cities and accommodate future population growth. However, the direction of urban planning of new cities still follow the same old approach in the planning, with modern techniques and assistance programs can be used to get a more accurate and comprehensive in terms of climate studies for residential buildings schemes which achieves savings of energy consumption. Selected the new city of Mansoura as a case study because of similar new specifications in Egypt in terms of climate convergence and its relation to or with common urban problems in most Egyptian medium-sized cities that are growing urban agricultural land surrounding the expense of the city, as well as from planned at the moment cities. Find proposes towards the planned strategy with specific vision using simulation and analysis software, which proposes optimal shape for planning in this region, according to climate data have to, in order to obtain lower power consumption.
التنمية العمرانية
التحليل الحراري للمباني
تخطيط التجمعات السکنية- الوفر في الطاقة
برامج المحاکاة في التخطيط
2020
07
08
23
39
https://bfemu.journals.ekb.eg/article_101519_99133e1e1b20e4cc08ccb88d28ed62e7.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
3
Uses GIS in Town Planning (Case Study: Landfill Site Selection of Al-Nasiriyah City in Iraq.)
H.
Alzamli
A.
Beshr
M.
Mewafi
S.
Metwally
Select a landfill site in an urban area is one of the most crucial topics in an urban planning process. The landfill site has a direct impact on the economic situation environmental and the health in the city. It is also directly related to the growth of the population which leads to increase the amount of waste brought daily. Select the landfill site is a complex process depends on many criteria. these criteria are varying from city to another, for example, the city center location, land use, airport, rail, various networks roads, steep, rivers, industrial zones, oil pipelines, natural resources and areas of archaeological and tourist. The impact of these criteria varies depending on the laws used, available land, and the geographical nature of the area. The main objective of the study is an integrated application for multi-criteria decision analysis MCDA with geographic information systems (GIS) to determine the most appropriate potential landfill in Al-Nasiriyah city in Iraq. The selected site was compared with the current landfill site in the city to explain if the old conforms criteria or not. The results of the study showed that the GIS with MCDA presents a good solution to select the best site for a landfill and is a good alternative instead of using the classical method. GIS and MCDA present a scientific analysis of all the expected effects of the new landfill by giving different weights for each criterion used in the study. These weights are according to the sensitivity and the impact of each criterion
Multi criteria Decision Analysis MCDA
Geographic Information System GIS
landfill site selection
2020
07
08
1
18
https://bfemu.journals.ekb.eg/article_101524_c2353419ddc0b7b94e8ae58c17057610.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
3
Changes of Land Cover in Diwaniyah Governorate and their Impact on Agricultural Sustainability by Using Geomatics Techniques.
M.
ELMewafi
S.
Kedy
A.
Elnaggar
Sustainability of agricultural lands has the highest priority worldwide and developing countries in particular. Fertile agricultural lands in Iraq are constantly deteriorating due to urbanization and importing agricultural products from other countries. The main objective of this work was to provide an accurate assessment of agricultural lands in Diwaniyah Governorate, Iraq during the studied period from 1985 to 2014.This was in addition to evaluating the availability of surface water resources for agricultural sustainability. For these purposes both Remote Sensing (RS) and Geographic information system (GIS) data and technology were integrated in this work. Landsat images in 1985, 1992, 2002 and 2014 were used to study spatial and temporal changes in agricultural lands in Diwaniyah Governorate. Three vegetation indices were used to map agricultural versus non- agricultural areas. These indices are the Normalized Difference Vegetation Index (NDVI), Transformed Normalized Difference Vegetation Index (TNDVI) and Soil Adjusted Vegetation Index (SAVI).The obtained results were used in calculating water consumption for agriculture crops in the studied area. It was found that agricultural areas represented about 764, 978, 919 and 1,198 km2from the studied area in 1985, 1992, 2002 and 2014, respectively. It was found that the TNDVI had the highest accuracy and accordingly the annual increase in agricultural lands was about 14.65km2 per year during the whole studied period from 1985 to 2014, which doesn’t comply with the annual increase in population (4%). Surface water resources were sufficient for the different human activities in 2014. There was a surplus of water resources by about 3.5 billion m3. However, shortage in water resources by about 2.6 billion m3 is expected if the targeted arable lands are cultivated by 2033.Two large areas can be proposed for land reclamation in Diwaniyah Governorate; however the annual increase in agricultural land has to reach 126 km2 per year to cultivate these proposed areas by 2033.
Agricultural lands
water resources
NDVI
SAVI
TNDVI
Change Detection
Remote Sensing
GIS
2020
07
09
19
36
https://bfemu.journals.ekb.eg/article_101860_b8809657d585a276cdd1fc6cb8fecffa.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
3
Treatment of Oil and Grease in Wastewater Using Electrocoagulation.
Hisham
El-Etriby
Kamal
Radwan
Karim
Taha
Batch electrocoagulation (EC) experiments were carried out to evaluate the removal of COD and O&G from wastewater using two types of electrodes: aluminum, iron, and then mix of aluminum and iron. The effects of operating parameters such as current intensity, initial COD concentration, contact time and NaCl concentration on COD and O&G removal efficiency had been investigated. It was found that increasing current intensity increased COD and O&G removal efficiency. Initial COD concentration had a little effect on removal efficiencies. Results showed that the best performance was obtained using aluminum electrode at a current intensity of 1.3 Ampere and 11.6 volt in 15 min contact time for 1500 mg/L initial COD concentration and 0.5 gm/L NaCl concentration. Under these conditions, COD removal efficiency reached 95.07% and total cost was 0 .84 LE/ /gm COD removal.
Electrocoagulation
Electrodes
Oil and grease and COD removal efficiency
2020
07
09
37
47
https://bfemu.journals.ekb.eg/article_101861_1d929c45f0104a7854a435a6536bb5cf.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
3
Sensitivity Analysis of Economic Evaluation Parameters of Upgraded Rural Roads Projects.
Hassan
Darwish
This paper presents a sensitivity analysis of the economic evaluation input parameters of the upgraded rural roads projects that includes construction cost, traffic growth rate and maintenance cost on the output parameters that includes Net Present Value (NPV) and Internal Rate of return (IRR). International experience didn’t specify specific limits or trends for the effect of them on the output parameters. So, the objective of this sensitivity analysis is defining the general trends and rates of effectiveness of each of them. To achieve the study objectives, forty three road sections were selected in four governorates in Upper Egypt; Menia, Fayoum, Assuit and Sohag to perform the sensitivity analysis. Results indicated that the NPV values decrease with the increase of the construction cost for all roads with approximately the same rate. A 5% unexpected increase in the cost causes the NPV to decline by about 0.6%. Roads that have lower positive NPV values may achieve negative NPV values if the construction cost unexpectedly increased by about 25%. The IRR values decreases with the increase of the construction cost. The rate of decrease of the IRR decreases as the construction cost increases. For roads that have IRR lower than 50%, the IRR percentage decreases as the construction cost increases with approximately constant rates. The NPV increases as the traffic growth rate increases; the increase in NPV is approximately constant for smaller growth rates while it is increasable for higher growth rates. The IRR values increases as the growth rate increases with approximately constant rates for all roads. Both of the NPV and IRR have approximately constant values with the change in maintenance cost escalation. The output parameters of the economic evaluation of roads are less sensitive to maintenance cost escalation.
Sensitivity analysis
Road Projects
Economic Evaluation
Rural Roads
2020
07
09
48
61
https://bfemu.journals.ekb.eg/article_101862_8d539cbd6f80ea3980cb13936eb164b4.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
3
Characterization of Collapsible Soils due to Saturation.
A.
EL-Masry
A.
Ibrahem
M.
EL-Miligy
M.
Ashour
This study is concerned with Collapsible soils which have significant volume decrease suddenly due to an increase in soil moisture content, with or without an increase in the in-situ stress level. Since the collapsible soils contain low levels of moisture content when they are formed naturally, they are considered to be such a problematic type of unsaturated soils. Reliable simple correlations between basic soil properties would be valuable because of the cost and difficulty of performing collapse tests either in the laboratory or in-situ. This study focuses on silty sand and sandy silt types of the collapsible soils. In order to fulfill the study objectives, a large database was developed from different researches works. The database contains information regarding basic soil properties of laboratory and field samples.
2020
07
09
62
73
https://bfemu.journals.ekb.eg/article_101864_f54497ca3c603815062489b1453d1252.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
3
Developing a Computerized Framework for Applying Value Engineering in Construction Projects.
H.
Abass
E.
Elbeltagi
M.
Youssef
This paper aims at developing a computerized system for applying the Value Engineering (VE) in construction projects. Simplified, quick and accurate system is designed to be used at any problem in normal day-to-day situations. The computerized tool is designed using Visual Basic for Application on Microsoft Excel. This system could be applied in (construction, sales, energy…). It is designed for the evaluation and comparison between one or more elements by identifying and categorizing element's functions to be achieved by the best ways. The developed system creates automatically the Function Analysis System Technique (FAST) diagram. Also, it decreases the total cost considering the life-cycle cost (LCC) analysis through innovative alternatives without affecting the basic functions. In all system applications, the VE inputs data that entered and solved is automatically stored and worked as a reference for future needs. A real-life construction project is used as a case study involving concrete ceiling's alternatives (solid slab and flat slab with different thicknesses). The results of applying the proposed system saved about 30% of project time which means reduction in project cost and at the same time achieving the required political, performance and quality targets. Keywords: value engineering VE, FAST diagram, life cycle cost LCC, alternative ranking, VE computerized
2020
07
09
74
87
https://bfemu.journals.ekb.eg/article_101866_c3d7ff7215821cd52fda01b9a663c755.pdf