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OALib Journal期刊

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The Recruitment Pattern of Liza falcipinnis from Elechi Creek, Upper Bonny, Niger Delta, Nigeria  [PDF]
Awoteinm Dateme Isaiah George, Jasper Freeborn Nestor Abowei
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104457
Abstract:
The Recruitment Pattern of Liza falcipinnis from Elechi creek of Upper Bonny, Niger Delta, Nigeria was studied from (March 2009-January 2010). The pattern showed all year round recruitment with two peaks (one major and one minor) during the period of the study. The parameters obtained were L = 19.96, K = 0.40 y1, C = 0, WP = 0, to = 0. The C indicates the amplitude of seasonal growth oscillations (that is, the magnitude of the growth patterns) and has values ranging from 0 to 1.0. Winter Point (WP) indicates the times of the year during which growth is minimal. The percentage recruitment for the different months were: March 2009 (15.0%); April (23.40%); May (14.0%); June (11.3%); July (10.0%); August (7.30%); September (1.8%); October (0.5%); November (2.2%); December (8.0%) and January 2010 (6.0%). The exploitation rate (Emax) that gives maximum relative yield-per-recruit was 0.424. The exploitation rate at which marginal increase occurred in the relative yield-per-yield was 10% of its value at E = 0, whereas (E0.1) was observed to be 0.357. The exploitation rate (E0.5) which corresponds to 50% of the virgin (that is, the unexploited stock) relative biomass-per-recruit was estimated to be 0.279. The mean ratio of length-at-first capture (L) and asymptotic length (L) was 0.060, while that of natural mortality (yr﹣1) and growth rate (yr﹣1) was 1.00. Yield per increased gradually with increase in exploitation and Biomass per recruit declined with increase in exploitation. An all year round recruitment, with one high pulse arid a low pulse was established for the species. Research should be carried out to ascertain the influence of environmental factors on the growth and recruitment of the species.
Physical and Chemical Parameters and Some Heavy Metal for Three Rainy Season Months in Water and Sediments of Upper New Calabar River, Niger Delta, Nigeria  [PDF]
Awoteinm Dateme Isaiah George, Jasper Freeborn Nestor Abowei
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104456
Abstract:
The study of heavy metals in water and sediment was carried out in the upper reach of the New Calabar River, Niger Delta region in Nigeria. Three sampling stations were selected which were Choba, Ogbogoro and Aluu. Water and sediment samples were collected and analysed, using the buck scientific Atomic Absorption/Emission spectrometer 200 A model. Water Physico-chemical parameters were measured in situ. Dissolved Oxygen had an overall mean of 4.17 ± 0.83 mg/l, temperature had mean value of 28.34℃ ± 1.07℃, pH had a mean value of 5.52 ± 0.54, electrical conductivity had a mean value of 1123.39 ± 859.58 μs/cm, BOD had mean value of 4.45 ± 1.14 mg/l, salinity had a mean value of 1.47 ± 1.15 ppt while TDS had mean value of 598.13 ± 529.58 mg/l. Result of heavy metals in water indicated that Zn had an overall mean value of 1.77 ± 0.53 ppm, Cr had mean value of 0.65 ± 0.21 ppm, Pb had a mean value of 0.19 ± 0.11 while Fe had an overall mean value of 1.52 ± 0.34 ppm. Heavy metals in sediment indicate higher concentration than in Water: Zn had an overall mean value of 7.90 ± 2.59 ppm, Cr observed an overall mean value of 1.94 ± 0.81 ppm, Pb had an overall mean value of 2.23 ± 0.61 ppm, while Fe observed an overall mean value of 87.43 ± 6.57 ppm. The result indicated that the source of heavy metals in the aquatic environment could be industrial effluent, domestic waste, dumping of scrap, vessel in the water way and runoff from agricultural land.
An Assessment of the Accumulation Potential of Pb, Zn and Cd by Avicennia marina (Forssk.) Vierh. in Vamleshwar Mangroves, Gujarat, India
Isaiah Nirmal KUMAR,Poliyaparambil Ravi SAJISH,Rita Nirmal KUMAR,George BASIL
Notulae Scientia Biologicae , 2011,
Abstract: The study deals with the accumulation of Pb, Zn and Cd in an important mangrove species, Avicennia marina (Forssk.) Vierh., in the Vamleshwar mangrove ecosystem, near Narmada estuary, West coast of Gujarat, India with height differences of 0.5, 1.5, 2.5 meters and carried out under field conditions during October, 2009. The site was located on 21°30′11.55′′ N latitude and 72°43′53.68′′ E longitude. Mangrove receives heavy metal pollution from upstream areas of Narmada estuary and highly populated settlements. However, little is known about the capacity of mangrove plants to take up and store heavy metals in them. Water, sediment and plant parts such as roots, stems and leaves were analyzed for finding the trace metal accumulation of different height groups by Inductive Coupled Plasma Analyser (ICPA). Amount of the content of metals found in the water, sediment and plant parts were in the order of Pb>Zn>Cd. The average contents of heavy metals in the waters were 57.83 mg l-1 for Pb, 3.89 83 mg l-1 for Zn and 0.42 mg l-1 for Cd. It was observed that the average contents of Pb (73.6 mg l-1), Zn (8.1 mg l-1) and Cd (0.73 mg l-1) in the sediments were below the critical soil concentrations. The concentrations of heavy metals in different parts of Avicennia marina were in the order Roots>stem>leaf except for Cd, but Cd found higher in leaf. The ranges of the content of heavy metals in plants were 18.5-102.2 mg l-1 for Pb, 3.5-19.5 mg l-1 for Zn and 0.2-4.1 mg l-1 for Cd. The concentrations of all heavy metals in Avicennia marina except Pb were falling within the normal range and were much more in the plants have the highest height. The present study has shown the potential of Avicennia marina as a phytoremediation species for selected heavy metals in many mangrove ecosystems.
Nutrient Dynamics in an Avicennia marina (Forsk.) Vierh., Mangrove Forest in Vamleshwar, Gujarat, India
Isaiah Nirmal KUMAR,Poliyaparambil Ravi SAJISH,Rita Nirmal KUMAR,George BASIL
Notulae Scientia Biologicae , 2011,
Abstract: The study was carried out to determine the nutrient budget of plants, sediments and nutrient dynamics in an Avicennia marina (Forsk.) Vierh., dominated forest in Vamleshwar near Narmada estuary, West Coast of Gujarat for a period of one year from November 2008 to October 2009. The average tree height of the mangrove is 1.5 to 2 m without much vertical stratification. Allometric methodology was used to measure the biomass, and yield a figure of 86.47 t ha-1 and the litter fall rate amounted to 2.9 t ha-1. Nutrient stocks of N, P and K in this mangrove were 137.05, 14.38 and 241.29 kg ha-1, with an annual accumulation of 55.74, 12.38 and 83.94 kg ha-1, and an annual return of 51.30, 10.83 and 13.52 kg ha-1, respectively, in the form of litter. The annual uptake for N, P and K were 61.04, 14.28 and 97.46 kg ha-1, and turnover rates of N, P and K were estimated at 3, 6 and 14 years, respectively, for the study period. Flow coefficients, which reveal the dynamic processes of nutrients between mangrove plants and sediments, are also explained. The present study concluded that the A. marina dominated mangrove plantation is more efficient in nutrient use and conservation.
Multi-state Multireference Rayleigh–Schr?dinger Perturbation Theory for Mixed Electronic States: Second and Third Order
Isaiah Shavitt
International Journal of Molecular Sciences , 2002, DOI: 10.3390/i3060639
Abstract: The formalism for multi-state multireference configuration-based Rayleigh-Schr?dinger perturbation theory and procedures for its implementation for the second-order and third-order energy within a multireference configuration interaction computer program are reviewed. This formalism is designed for calculations on electronic states that involve strong mixing between different zero-order contributions, such as avoided crossings or mixed valence-Rydberg states. Such mixed states typically display very large differences in reference-configuration mixing coefficients between the reference MCSCF wave function and an accurate correlated wave function, differences that cannot be reflected in state-specific (diagonalize-then-perturb) multireference perturbation theory through third order. A procedure described in detail applies quasidegenerate perturbation theory based on a model space of a few state-averaged MCSCF functions for the states expected to participate strongly in the mixing, and can be characterized as a “diagonalize-then-perturb-thendiagonalize” approach. It is similar in various respects to several published methods, including an implementation by Finley, Malmqvist, Roos, and Serrano-Andrés [Chem. Phys. Lett. 1998, 288, 299–306].
Translating African Names in Fiction
Bariki,Isaiah;
íkala, Revista de Lenguaje y Cultura , 2009,
Abstract: in this paper, we study the sociocultural and ethnopragmatic significance of african names as used by the yoruba and izon of nigeria and the akan of ghana. from the perspective of linguistic anthropology, we show the non-arbitrary nature of these names and demonstrate the need to translate them, particularly in fictional texts, so that their significance may be preserved.
El juicio político
Berlin , Isaiah
Revista de Economía Institucional , 2001,
Abstract:
Patience Sorting and Its Generalizations
Isaiah Lankham
Mathematics , 2007,
Abstract: This dissertation collects together results on Patience Sorting and its generalizations. It incorporates the results of math.CO/0506358, math.CO/0507031, and math.CO/0512122, as well as previously unpublished results.
Predicting Job Dissatisfaction among Community Junior Secondary School Teachers in Botswana  [PDF]
M. N. Isaiah, H. J. Nenty
Psychology (PSYCH) , 2012, DOI: 10.4236/psych.2012.33039
Abstract: African governments tend to refuse to accept the obvious truth that dissatisfaction among teachers has contributed significantly to their inability to attain their educational goals at all levels. A disgruntled worker cannot put in assiduous effort at achieving set goals, especially goals whose levels of achievement are not readily obvious. The spirit underlying the natural pride of contributing to the growth and development of human beings is greatly robbed by the dissatisfaction among teachers. This study tries to determine what factors predict this dissatisfaction among teachers in community junior secondary schools in the South Central Region of Botswana. To determine these for teachers in the 55 community junior secondary schools in the South Central Region of Botswana, a validated 68-item questionnaire with 6-Likert-type options designed to measure level of job satisfaction and factors that influence it were administered to 255 teachers from 12 randomly selected schools in the area. A stepwise regression analysis of the resulting data showed that of the nine variables that combine to account for 57% of the variability in the level of teacher’s job dissatisfaction, refusal by parents to be involved in the education of their children accounted for 34% of such variance. The findings were discussed and recommendations made.
Climate Smart Agriculture: Achievements and Prospects in Africa  [PDF]
Adornis D. Nciizah, Isaiah I. C. Wakindiki
Journal of Geoscience and Environment Protection (GEP) , 2015, DOI: 10.4236/gep.2015.36016
Abstract:

Smallholder agriculture is facing a myriad of challenges in the wake of a changing climate. To counter this, several measures have been suggested in attempts to reduce the vulnerability of smallholder farmers who are the worst affected by changes in climate. However, despite these interventions not much improvement in agricultural production has been realized by the smallholder farmers. This suggests the need for more alternative options for these resource poor farmers. One such intervention is climate smart agriculture (CSA), which is probably one of the most viable and sustainable options. It offers both mitigation and adaptation measures to climate changes. However, problems of its viability and sustainability have been raised by several authors who argue that there are barriers, limits and costs, which may hinder its adoption by farmers. This review discusses the achievements attained so far in improving the productivity of smallholder agricultural soils under changing climatic conditions. The review also looks at the prospect of CSA with regards to South African smallholder agriculture.

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