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Publisher Europa Publishing

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335 articles
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Ernest Oria Ihendeson, Awajiogak A Ujile, Anthony K. Leol
European Journal of Engineering Research and Science, Volume 4, pp 115-122; doi:10.24018/ejers.2019.4.1.1097

Abstract:This study aim to proffer solution to the factors causing delay is pipeline construction project deliverables, it compared deterministic model (variable with certainty) and stochastic model (variable with uncertainty), with Six (6) planned project schedules of Brownfield Energy Service Limited for pipeline construction. Time assigned to critical activities, identified from a network analysis, with the aid of the Critical Path Method, expected mean time, both deterministic and stochastic duration was calculated. Program Evaluation Review Techniques (PERT), the variance and standard deviation of the critical activities were also calculated. The probability of completion of a project within a given period was gotten with PERT. Comparing the results for deterministic duration 60 days to 79 days, which is 50% compared to 64%. It was concluded that stochastic model is preferable when scheduling and executing pipeline construction projects, because uncertainties are factored into the planning and scheduling process including delays. Delays during execution stage, occurs mainly due to community related issues, equipment failures, change in job scope and work- men antics but not limited to these. This study advocates elimination of causes of delay, especially before and during project execution phase. It also suggested that every project schedule should follow an order of precedents, prerequisite, and management involvement and cooperation at all stages of the project
Rehab Ahmed Salman, Gurashi A. Gasmelseed, Rawia S. Hassan
European Journal of Engineering Research and Science, Volume 4, pp 123-125; doi:10.24018/ejers.2019.4.1.1081

Abstract:Tanneries use much of chemicals such as sodium sulphide ,calcium hydroxide, ammonium sulphate, acids, basic chromium sulphate bactericide and fungicide. All these substances contribute to the environment pollution, although biological and chemical treatment methods are required, but still these methods are not effective enough to reduce pollution to the international standard level required. This pollution problem has to be solved completely via recycling through all wet processes from soaking to retannage.In this study the spent solutions were recycled for soaking, deliming and retannage processes many times with addition of makeup of chemicals and water ,that normally used , The produced crust quality was tested and the results were found to be satisfactory.
Helen J. Lawalata, Jovialine A. Rungkat
European Journal of Engineering Research and Science, Volume 4, pp 106-109; doi:10.24018/ejers.2019.4.1.990

Abstract:Diversity of Lactic acid bacteria (LAB) that have ability to improved number of carnocine on bakasang were determind by application of molecular approach. Molecular characterization of LAB was based on 16S rRNA gene sequencing. The result showed that one isolate lactic acid bacteria (Pediococcus sp.B.5.1) among 9 isolates LAB exhibited the highest ability to improved number of carnocine. The molecular characterization based on 16S rRNA gene sequence showed that the Pediococcus B.5.1 isolate clearly belonged to members of species Pediococcus acidilactici. Therefore, lactic acid bacteria with the high ability to improved number of carnosine could be found from fermented fish bakasang and make bakasang as a functional food.
Ghareeb Moustafa
European Journal of Engineering Research and Science, Volume 4, pp 110-114; doi:10.24018/ejers.2019.4.1.1103

Abstract:The effect of current cycle on the behavior of contact resistance of clamped connectors was investigated experimentally to characterize the thermal behavior of the used clamped connector and optimizing the installation procedure in order to reduce contact resistance and ensure a lower temperature during normal operating conditions. The thermal network method is used for calculating the temperature rise of the connector when loaded by a current. The method is based on substitution of the connector geometry by a circuit consisting of thermal resistances, capacitance and heat sources. The temperature rise is determined using the network simulation program PSPICE with the corresponding thermal model libraries. The validity of the obtained results has been checked by comparing the computed values with those measured experimentally. The agreement was found satisfactory
Ibrahim Moh'D Arman
European Journal of Engineering Research and Science, Volume 4, pp 101-105; doi:10.24018/ejers.2019.4.1.1070

Abstract:The study aimed at investigating the effect of employing the strategy (Formulate- Share- Listen- Create) (FSLC) on the 4thGraders developing their mathematical representation skills in governmental schools in Hebron governorate - Directorate of Education. In order to achieve the objectives of the study, it was applied on a purposive sample of (124) fourth graders in Al-Huda Basic Education for Girls School and El Amin Basic Education for Boys School in the Directorate of Education / Yatta. The sample included (67) Male students, and (57) Female students. The students distributed into four sections, one section in each school represented the control group (studied in the traditional method), and the other section represented the experimental group (studied according to the Form-Share-Listen and Create strategy (FSLC). The researcher designed the test of the skills of mathematical representation skills, the researcher verified the validity and reliability of the tool. The results revealed that there were statistically significant differences at the level of significance (α≤0.05) among the 4thGraders in the test of mathematical representation skills due to the teaching method and for the experimental group studied according to the strategy of the strategy (FSLC). The study revealed that there were no statistically significant differences at the level of significance (α≤0.05) in the test of mathematical representation skills due to gender, or the interaction between gender and the method.In the light of the results of the study, the researcher recommends using the teacher's guide to use the Form-Share-Listen and Create strategy (FSLC) in teaching mathematics, and training teachers to use the strategy in developing mathematical written skills (writing and presentation) and the verbal skills (speaking, listening and reading), as well as conducting further studies on the impact of this strategy in other variables and subjects. Such as solving life problems and making decision.
Cao Dao Nam
European Journal of Engineering Research and Science, Volume 4, pp 92-96; doi:10.24018/ejers.2019.4.1.1078

Abstract:Compression ignition engine and PPCI-Partially Premixed Combustion Ignition, in which part of the fuel is sprayed on the fill line and the remainder is directly sprayed in the cylinder, bringing the advantages of both gasoline engine (fuel blends well with air) and diesel engine (compressed by compression). At the same time, it is possible to control the burning time of the mixture and the engine is stable and continuous thanks to the second fuel injection directly in the combustion chamber. This new method of forming mixtures and fire concepts in engines can solve both the problem of toxic combustion and emissions on internal combustion engines as well as energy security due to the use of various types. renewable fuel.
Godspower W. Omokhunu, Christian Bach
European Journal of Engineering Research and Science, Volume 4, pp 85-91; doi:10.24018/ejers.2019.4.1.635

Abstract:This paper aims to review current research and advancement in technology in organic bioelectronics and to reinvestigate the relationship between organic bioelectronics materials, properties, and application. A comprehensive literature review on organic bioelectronics and its dependent variables created a theoretical foundation for the paper. Using the review-centric theory, a model was developed and presented to encapsulate highly dynamic interaction of organic bioelectronics, synthetic and natural material sources that can be employed in present innovations and its implications on modern technologies. The model highlights the relationship between organic bioelectronics and its four main drivers namely, synthetic material (Piezoelectric energy harvesters), natural materials (electric organs), application (bio-devices, sensors, nanogenerators) and properties. Limitations to this research include; availability of raw materials in appropriate amounts, problems associated with interfacing natural with synthetic materials, maintenance of bioelectronics devices in living organisms and design methods for a variety of specific devices. The empirical data is limited to 4 dependent variables which do not present a conclusive theory about organic bioelectronics. In this review, we explored the possibility of interfacing synthetic material (PVDF) and a natural material (electric organ of Electrophorus electricus) by reviewing their properties, fabrication methods to create a composite that has application in a variety of bioelectronics devices.
Man Kyu Huh
European Journal of Engineering Research and Science, Volume 4, pp 97-100; doi:10.24018/ejers.2019.4.1.1051

Abstract:The study was to investigate species composition and biological water quality of benthic macroinvertebrates among localities at Gwangseok stream, Jinhae city in Korea. The identified benthic macroinvertebrates were 781 individuals belonged to 19 species, 14 families, 8 orders, 5 classes and 3 phyla. The value of dominance index (DI) was varied from 0.184 (St. C) to 0.333 (St. A) with a mean of 0.235. DI was significantly different among the four regions. Beck-Tsuda's Biotic Index (BI) was varied from 7 (St. D) to 20 (St. C) with a mean of 14. Total ecological score of benthic macroinvertebrate community (TESB) was varied from 12 (St. D) to 38 (St. B) with a mean of 26.3. Average ecological score of benthic macroinvertebrate community (AESB) was varied from 1.714 (St. D) to 1.900 (St. B) with a mean of 1.821. Benthic macroinvertebrate index (BMI) ) was varied from 22.354 (St. A) to 26.474 (St. D) with a mean of 39.756. Shannon-Weaver index (H´) for mammals at the upper regions (St. A and St. B) was higher than those of low regions (St. C and St. D). Berger-Parker’s index (BPI) was varied from 0.218 (St.. C) to 0.346 (St. A). Richness (R1) was different from each other and R2 was not shown significant differences (p < 0.05). Evenness indices (E1-E5) for four stations were different from each other, however there were not shown significant differences (p < 0.05).
Zia Razzaq, Solomon Tecleab
European Journal of Engineering Research and Science, Volume 4, pp 81-84; doi:10.24018/ejers.2019.4.1.1059

Abstract:Presented in this paper is an outcome of a study to assess the effect of section loss in the form of longitudinal notches on the buckling load of hollow square section steel columns. The theoretical study includes buckling load estimates based on both an iterative equilibrium as well as a non-iterative energy approach. Buckling loads based on sample laboratory experiments are also presented. The study shows that the presence of a notch can significantly reduce the axial load-carrying capacity of a steel column.
Christopher Udoka, Barinyima Nkoi, Felix E. Oparadike
European Journal of Engineering Research and Science, Volume 4, pp 75-80; doi:10.24018/ejers.2019.4.1.1096

Abstract:The aim of this research is to compare the economic benefits of various types of power generating technologies such as gas turbines, wind turbines and solar energy that is suitable for power producing plants in Nigeria. The study conducts economic assessment by developing a data-intensive spread-sheet-based model. The model estimates the unit cost of electricity generated by a 10MW capacity solar photovoltaic system (PV), Wind turbine and Gas Turbine. Comparison based on investment cost and capacity charge indicated that the levelized cost of electricity (LCOEsolar) by solar PV was found to be $0.05188 per kWh with a net present value of (-$3,520,003), (LCOEwind), by Wind turbine was found to be $0.0732per kWh or with a net present cost of (-$24,486,076), while (LCOEgas) by Gas turbine was found to be $10.07214 per kWh or with a net present value of ($11,813,136). Results obtained with reference to LCOE showed that solar PV has the lowest cost of power generation, followed by gas turbine, and then wind turbine. Consequently, comparison based on decision for economic and preferable energy to invest in as well as the annual return the investment is projected to generate indicated that the internal rate of return (IRR) for both solar PV and wind turbine was found to be negative with a simple payback period of 14 and 35 years respectively, while internal rate of return (IRR) for gas turbine was found to be 18.67% with 5 years payback period. Hence, result obtained with reference to IRR and SPBP showed that gas turbine is the most economic and preferable energy generating technology to invest in since it is projected to generate 18.67% annual return from the investment in a minimum of 5 years period as compared to solar PV and wind turbine. Although natural gas-based power generation has lower upfront costs but it is vulnerable to volatile fuel prices, whereas electricity generation from renewables has higher upfront costs but provides electricity at costs that are highly predictable.
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