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OALib Journal期刊

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Investigation of the Effects of Air-Conditioning System on the Temperature and Speed of Automobile Engine Using Paired T-Test and Regression Analysis  [PDF]
Olufemi Sylvester Bamisaye, Anthony Yinka Oyerinde, Ubong Akpan Essien
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105090
Abstract:
This study investigated the effect of air-conditioning system on the tem-perature and speed of automobile engine before and after the air-conditioning system was put to use, while the vehicle was at static position. A 16-valve Nissan engine was used for this study, the engine was first run for 20 minutes before the data are collected. In the first case, the temperatures (℃) of the engine were taken in the interval of 10 minutes before and after the air-conditioning system is run and in the second case, the speeds of the engine were taken under the same conditions. The research hypothesis was formulated for 20 observations to argue that neither temperature nor speed of the engine changes when the air-conditioning system is put on and Paired t-Test statistics were used. The obtained result of t-statistics analysis for temperature and speed were -4.0329 and -5.51832 respectively. These results when compared to their critical values at 5 percent significant level, t-Statcritical < -1.73 for temperature and speed, were discovered to be at the rejection region which indicates that the null hypothesis (Ht0 and Hs0) in each case is rejected and accept that the air-conditioning system changes the temperature of the engine. Also, changes in speed requirements of the engine are not immediate and it could be as a result of an increase in fuel consump-tion due to more load on the engine. The regression correlation coefficients of 0.999996066 and 0.999653453 were obtained for the temperatures and speeds respectively with their R2 values, 0.999992132 and 0.999307027. The coefficients in the analysis were used to formulate the regression equations; T2 = 135.640 1.025t 0.496T1 and N2 = 634.005 3.824t 0.270N1 which can be used to forecast the temperatures and speeds of the engine during air-conditioning usage giving the initial parameters.
Phonotactic Adjustments in Yoruba Adaptation of English Syllable Structures  [PDF]
Toyin Bamisaye, George Adekunle Ojo
Open Journal of Modern Linguistics (OJML) , 2015, DOI: 10.4236/ojml.2015.54034
Abstract: This paper examines the phonotactic processes in Yoruba adaptation of English syllable structures. It investigates the nativization of English consonant structure in the word-initial and word-final positions by Yoruba-English bilinguals. From the contact and influence of the English language and Yoruba language in an ESL environment, the fundamental thrust of linguistics would be to explicate the influence that one language would have on another. In this case, the focus is on the effects the English has on Yoruba. When these effects are viewed, it is discovered that structural rules are affected. Our findings reveal that vowel epenthesis is not constantly the repair device. Analysis of data shows that consonants are either preserved or deleted which justifies the earlier position of scholars of foreign syllable modifications.
Uplink Performance Evaluation of CDMA Communication System with RAKE Receiver and Multiple Access Interference Cancellation  [PDF]
Ayodeji J. Bamisaye, Michael O. Kolawole
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2010, DOI: 10.4236/ijcns.2010.36072
Abstract: In CDMA communication systems, all the subscribers share the common channel. The limitation factor on the system’s capacity is not the bandwidth, but multiuser interference and the near far problem. This paper models CDMA system from the perspective of mobile radio channels corrupted by additive white noise generated by multipath and multiple access interferences. The system’s receiver is assisted using different combining diversity techniques. Performance analysis of the system with these detection techniques is presented. The paper demonstrates that combining diversity techniques in the system’s receivers markedly improve the performance of CDMA systems.
Evaluation of Downlink Performance of a Multiple-Cell, Rake Receiver Assisted CDMA Mobile System  [PDF]
Ayodeji J. BAMISAYE, Michael O. KOLAWOLE
Wireless Sensor Network (WSN) , 2010, DOI: 10.4236/wsn.2010.21001
Abstract: In wireless Code Division Multiple Access (CDMA) system, the use of power control is indispensable to combat near-far and fading problems. Signals transmitted over a multipath propagation channel which exhibits inter-path interference and fading. The receiver has to employ measures to mitigate these effects or it will incur severe performance degradation. A classic approach in CDMA communications is the rake receiver. In this paper, the downlink performance is estimated for a CDMA mobile system at the vertex of multiple adjacent cells. At the base station the received signal is coherently dispread and demodulated using a rake receiver. The effects of power control, error correction and rake receiver were also investigated on the assumption that the received signals undergo Rayleigh fading, lognormal shadowing, and frequency selective fading. The evaluation of performance measures of base to mobile link (downlink) of a multiple-cell CDMA mobile system is presented. This study demonstrates that significant performance improvements are achievable with combined use of power control, rake receiver and error correction scheme.
Global Climate Change  [PDF]
Olufemi Adedeji, Okocha Reuben, Olufemi Olatoye
Journal of Geoscience and Environment Protection (GEP) , 2014, DOI: 10.4236/gep.2014.22016
Abstract: Climate change is one of the major challenges of our time and adds considerable stress to our societies and to the environment. From shifting weather patterns that threaten food production, to rising sea levels that increase the risk of catastrophic flooding, the impacts of climate change are global in scope and unprecedented in scale. Without drastic action today, adapting to these impacts in the future will be more difficult and costly. This overview deals with the concept of Global Climate Change, the associated terms, causes, consequences, solutions and its potential health impact. It shows the need to act urgently if we are to avoid an irreversible build-up of greenhouse gases (GHGs) and global warming at a potentially huge cost to the economy and society worldwide. Therefore, addressing climate change requires an “unprecedented level of cooperation, not only between countries, but also between different levels of Governments, private sector and individuals.
Cement Bonded Particle Board Production from Rice-Husk in Southwestern Nigeria
J.A. Bamisaye
Journal of Engineering and Applied Sciences , 2012,
Abstract: Effort to remove natural defects from timber led to the development of particle board industry which made use of saw dust, planer shavings and other relatively homogeneous waste materials produced by the wood industries. This study reports on the production of cement bonded particle board from rice husk which is readily available in large quantities in various areas where rice is grown. The chemical additive used to accelerate the setting of cement board during hydration was aluminium Chloride (AlCl3) due to its availability and the cement to rice husk mix ratio used were 2:1, 1.75:1, 1.5:1, 1.25:1 and 1:1. High density boards were produced and physical property test such as moisture content, density, water soak and linear expansion were carried out while the mechanical properties tested for were static bending test used to determine both moduli of rupture and elasticity and impact resistance. The cost analysis revealed that the production of 600 by 600 mm rice husk particle board costs N145.75 while that of wood shavings was N160:00. It was therefore concluded from this study that durable particle board could be produced by using rice husk to totally replace the conventional wood shavings. Thus, its adoption will further enhance local content development in the construction industry.
Nutritional Requirement of Target Population Groups in the Developing Countries: A Case Study of Amala Served with Okro Soup and Jollof Beans
Bamisaye,Fisayo Abraham
Pakistan Journal of Nutrition , 2009,
Abstract: Nutritional requirement of target population groups in the developing Countries was investigated. Two commonly affordable meals (Amala served with okro soup and Jollof beans) were analyzed and the percentage macronutrients obtained in them were converted to grams. The percentage wet weight composition (2.25, 0.67, 32.09 and 3.06, 3.28, 12.69) were found to be equivalent to 4.97, 1.39, 70.85 and 8.22, 8.81, 34.09 g of fat, crude protein and carbohydrate from Amala and Jollof beans meals respectively. The energy content (Kcal) from carbohydrate, the primary source of energy for Amala and Jollof beans meals was determined and found to be 283.42 and 136.34 respectively. These results were then compared with the Standard Recommended Allowance and the Standard Energy/Calorie Requirements for different age groups. The results obtained revealed that these meals did not meet the nutritional requirements of any of the different age groups. This may definitely have advert effects on these population groups.
Production and Characterization of Porous Insulating Fired Bricks from Ifon Clay with Varied Sawdust Admixture  [PDF]
Fatai Olufemi Aramide
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2012, DOI: 10.4236/jmmce.2012.1110097
Abstract: The effect of compositions of saw dust admixture on thermal conductivity and other mechanical/refractory properties of Ifon Clay was investigated. The raw clay gotten from Ifon in Ondo state was first processed to very fine particles and characterized using SEM/EDX, XRD and XRF. Sawdust from mahogany tree procured from a saw mill in Akure the State capital of Ondo State was also dried to remove moisture present. A composite mixture of this dried saw dust with the processed clay was made at various proportions of the saw dust, with a little addition of water for plasticity. Sam- ples of cylindrical dimensions were then produced from the mounting press by the process of compaction with a very high pressure. The samples were dried and then finally fired in the furnace at 1000?C for a final curing. Properties which include thermal shock resistance, bulk density, cold crushing strength, thermal conductivity and porosity were obtained by the appropriate standard test methods. The microstructures of the fired samples were also characterized with SEM using back scattered secondary imaging. The results show that the amount of sawdust admixture affects the properties variously; porosity increases with percentage increase in sawdust admixture while the thermal conductivity and other properties of the sample reduce with percentage increase in sawdust admixture. It was concluded that for structural insulating bricks where compressive strength is important the sawdust admixture should not exceed 10 to 15 percent.
Assessment of Groundwater Quality and Saline Intrusions in Coastal Aquifers of Lagos Metropolis, Nigeria  [PDF]
Adewuyi Gregory Olufemi
Journal of Water Resource and Protection (JWARP) , 2010, DOI: 10.4236/jwarp.2010.210100
Abstract: As a result of immense industrialisation and high population growth, groundwater is heavily relied on in Lagos metropolis to serve as an alternative source of water where surface water is seriously polluted. The continued reliance on ground water has resulted in its decline in quantity and quality. In this study, the coastal aquifers of Lagos metropolis were selected for an assessment of its groundwater quality and impact of saline intrusion. Water samples collected along the coastal region were subjected to various physicochemical analyses. Results obtained were compared with permissible values for drinking water stated by Federal Environmental Protection Agency (FEPA) and World Health Organization (WHO). The results revealed that all the water samples were significantly hard (range 522.14 – 1233.34mg/L). The salinity was delineated by conductivity measurements. Three samples had specific conductance above the stated limits for fresh water. The samples however met the stipulated limits for drinking water for the other tested parameters.
The Behaviour of Vertical Bell Laboratories Layered Space-Time Algorithm Combined with Multiuser Detection Schemes in Wireless Communication System  [PDF]
Ayodeji James Bamisaye, Olugbenga Kayode Ogidan, Babatope Osalope
Communications and Network (CN) , 2011, DOI: 10.4236/cn.2011.32007
Abstract: This paper provides the performance analysis of multiuser Vertical Bell Laboratories Layered Space-Time (V-BLAST) system receiver structures for Multiple-input Multiple-Output (MIMO) channel at a base station with assumption of perfect channel estimation and perfect timing delay estimation. In MIMO channels the receivers such as decorrelator, Minimum Mean Square Error (MMSE) and Multistage Parallel Interference Cancellation (MPIC) receiver outperform the conventional receiver. Withal, since the multiple antenna interference led to a strong impact on the performance degradation of a multistage interference cancellation receiver, the performance of MPIC receiver was highly degraded based on system loading.
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