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Search Results: 1 - 10 of 364430 matches for " P. N. Ndoke "
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Traffic Control by Traffic Wardens in Minna, Niger State, Nigeria
Leonardo Journal of Sciences , 2006,
Abstract: Traffic control by traffic wardens on three at-grade interactions in Minna, Northern Nigeria has been analysed. During the morning peak periods, it was observed that with traffic warden control, none of the approaches of the intersections operated beyond level of service E. However, when the wardens did not control traffic, the approaches operated at level of service, F, which has been shown in studies to be unacceptable to most drivers. Taking other factors like stability of electricity supply, motorists’ behaviour and society’s acceptance of innovations into consideration, it has been concluded that for now, there is no alternative to the traffic warden in traffic control in developing cities.
M. Abubakar,P. N. Ndoke
Academic Research International , 2013,
Abstract: Of recent, the government of Niger state has embarked on the construction of roundabouts with small central island rotaries; this paper compares the performance of large central island rotaries with small central island rotaries. The performance of large central island rotaries compares well to the performance of small central islandrotaries. Capacities of rotaries with small islands were found to be higher than capacities of large central island rotaries while the delay for large central island rotaries was found to be higher than that of small central island rotaries. However, both large and small central island rotaries were found to be operating at the samelevel of service. This study provides recommendations to traffic engineers and/or planners on the conditions under which both central island rotaries perform better and, thus, should be considered.
Performance of Palm Kernel Shells as a Partial replacement for Coarse Aggregate in Asphalt Concrete
Peter Ndoke NDOKE
Leonardo Electronic Journal of Practices and Technologies , 2006,
Abstract: This paper looks at the potentials of palm kernel shells as coarse aggregates in road binder courses with emphasis on strength of the asphalt concrete as given by the Marshal Stability and flow values. It was observed that palm kernel shells can be used to replace coarse aggregate up to 30% before drastic reductions become noticeable. It is therefore recommended that for heavily trafficked roads, palm kernel shells up to 10% can be used for the replacement while even 100% replacement is possible for lightly trafficked roads in the rural settings.
Palm Kernel Shells as a Dust Control Palliative on an Unpaved Road
Peter Ndoke NDOKE
Leonardo Electronic Journal of Practices and Technologies , 2006,
Abstract: An assessment of the effectiveness of the use palm kernel shells as a dust control palliative on an unpaved road has been carried out. The palm kernel shells were able to reduce the quantity of dust generated from the road to about 75% a few days after the application. It was then suggested that with the absence of funds for road maintenance works organic materials like palm kernel shells could be used as palliatives.
Contributions of Vehicular Traffic to Carbon Dioxide Emissions in Kaduna and Abuja, Northern Nigeria
Peter Ndoke NDOKE,Uduak George AKPAN,Mary Egiganya KATO
Leonardo Electronic Journal of Practices and Technologies , 2006,
Abstract: The quantity of carbon dioxide (CO2) contributed by automobile emissions to the environment was determined at some areas in Kaduna and Abuja in Northern Nigeria. Five census stations were selected in each of the two towns. In Kaduna, Jabi road in Ungwan Rimi, Kawo Motor park, Stadium round-about, Sabo and Kasuwa (Kaduna Main Market), were selected, while Asokoro (behind ECOWAS), Area One junction, A.Y.A. junction, Wuse market bus-stop, and Mabushi round-about were selected for Abuja. A gas sampling pump and tubes that could detect carbon dioxide were used to detect the quantity of CO2 in the environment at a certain time. The results obtained show a variation in the amount of CO2 in the environment. Areas with relatively heavy congestion show a high concentration of CO2, while areas with minimal traffic show a lower concentration of CO2. Sabo in Kaduna has an average concentration of 1840 ppm being the highest, while Asokoro (behind ECOWAS), Abuja has the least average concentration of 1160 ppm. Review of literature showed that increasing CO2 levels have adverse effects such as the Greenhouse Effect, which may lead to Global Warming, as well as a number of other climatic events. These concentrations are still not high enough to cause any serious health effects but they provide a baseline study for Policy makers and Town planners.
Some New Estimators of Integrated Volatility  [PDF]
Jaya P. N. Bishwal
Open Journal of Statistics (OJS) , 2011, DOI: 10.4236/ojs.2011.12008
Abstract: We develop higher order accurate estimators of integrated volatility in a stochastic volatility models by using kernel smoothing method and using different weights to kernels. The weights have some relationship to moment problem. As the bandwidth of the kernel vanishes, an estimator of the instantaneous stochastic volatility is obtained. We also develop some new estimators based on smoothing splines.
Location Results for Brace Spacing in Gap Tubular “K” Joints Using FEM  [PDF]
P. N. Jiki
Modern Mechanical Engineering (MME) , 2013, DOI: 10.4236/mme.2013.31007

The 8-node iso-parametric thin shell element was employed in the study of stress concentrations in the welded tubular K joint. Element equilibrium equations were derived using isoparametric formulation based on thin shell theory. After assembly, the resulting system equations were solved using existing fortran programs. Numerical experiments were conducted to isolate and locate ideal gap (positions) for the two braces of the K joint. The nominal stresses were calculated from which stress concentration factors were obtained. The resulting stress concentration factors were presented both as tables and as figures. A good agreement between our solutions and those for model joints in the literature is good and acceptable. It was found that the wider apart the brace spacing is, the weaker the strength of the joint. It was also found that the best location for the braces occurs when the stress level changes sign either from positive to negative or vice versa at a critical sampling point.

The Role of Red Algae in Abrupt Appearance of Animals in the Early Cambrian on Siberian Platform  [PDF]
P. N. Kolosov
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.412A2008

Calcified rock-forming marine filamented benthic micro- and macrophytes of Dzhelindia Kolosov, 1970 (Figure 1(а)) and Chaptchaica Kolosov, 1975 (Figure 1(b)) genera, thrived in Neoproterozoic (1000-541 million years ago) Siberia together with cyanobacteria. Their belonging to Rhodophyta is well-grounded. These and other Neoproterozoic rodofits, as well as Epiphyton Bornemann 1886 (Figure 1(c)) and other Early Cambrian (541-513 million years ago) benthic algae, oxygenating floor of epicontinental sea basin, formed conditions, favorable for the animals. In combination with other biotic, and such abiotic factors as: equatorial position and tectonic feature of Siberian platform; volcanism; transgression of the sea; diversity of ecologic niches, these conditions were prerequisites of skeleton and shell acquisition by Early Cambrian animals, and as a consequence, accelerated morphologic evolution, increased diversity of taxons of different groups of animals.

Gross alpha and beta activities and trace heavy elemental concentration levels in chemical fertilizers and agricultural farm soils in Nigeria  [PDF]
N. N. Jibiri, K. P. Fasae
Natural Science (NS) , 2013, DOI: 10.4236/ns.2013.51012

The gross alpha (α) and beta (β) activities and trace heavy elemental concentrations have been determined in Single Super Phosphate (SSP) and Nitrogen Phosphorous Potassium (NPK) fertilizers samples used for agricultural purposes in Nigeria. Cultivated farm soil samples from two regions (north and south) in the country and samples of phosphate rocks were also analyzed for gross α and β radioactivity and elemental concentrations. The beta activity concentration in the NPK (15-15-15) fertilizers was found to vary from 2410.0 ± 80.0 Bq·kg–1 to 4560 ± 140.0 Bq·kg–1, between 1340.0 ± 70.0 Bq·kg–1 and 1440.0 ± 70.0 Bq

Subterraniphyllum thomasii Elliott, Fossil Calcareous Alga the Evolutionary Link between Geniculate and Nongeniculate Coralline Algae: A Hypothesis  [PDF]
Shyam N. Mude, P. Kundal
Open Journal of Geology (OJG) , 2011, DOI: 10.4236/ojg.2011.13006
Abstract: The Neogene sediments exposed in the Saurashtra region along the southwest coast India, consists of well preserved diversified coralline algae [1-5].The Subterraniphyllum thomasii Elliott, a fossil Calcareous alga has been reported from the Dwarka Formation (Lower to Middle Miocene) from Porbandar area, Saurashtara, Indian subcontinent. This is the first report of Subterraniphyllum thomasii Elliott from Lower-Middle Miocene sediments from the Indian subcontinent; however it has been documented earlier from Late Lutetian sediments of Kuchchh Basin, India. There is a controversy regarding the generic placement of the extinct species Subterraniphyllum thomasii Elliott as distinct genus of the geniculate coralline algae or not i.e. nongeniculate coralline algae [6,7]. However, the present specimens of Subterraniphyllum thomasii Elliott exhibit pinpointing features of both geniculate and nongeniculate coralline algae. Finally on the basis of our observations, we hypothesis that Subterraniphyllum thomasii Elliott may be transitional species and evolutionary link between geniculate and nongeniculate coralline algae.
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