American Journal of Scientific and Industrial Research最新文献_第8页

Diminishing Atmospheric Carbon Monoxide fluxes as a Forecast of theNew Planting Season in West Africa 西非新种植季节大气一氧化碳通量递减预报

American Journal of Scientific and Industrial Research Pub Date : 2012-08-01 DOI: 10.5251/AJSIR.2012.3.4.198.202

M. Akinyemi

{"title":"Diminishing Atmospheric Carbon Monoxide fluxes as a Forecast of theNew Planting Season in West Africa","authors":"M. Akinyemi","doi":"10.5251/AJSIR.2012.3.4.198.202","DOIUrl":"https://doi.org/10.5251/AJSIR.2012.3.4.198.202","url":null,"abstract":"This paper studied the variability of background Carbon Monoxide CO fluxes from 2000 to 2010 as \u0000released by satellite observatory system from the Measurement of Pollution in the Troposphere \u0000(MOPITT) instrument over the West African region, from latitude 2o N to 15 o N. From the twelve \u0000months of the year studied, the data for December and January to April followed a particular trend \u0000which was observed to be relevant in the forecasting of the following planting season over the region. \u0000The study revealed that the background CO fluxes averaged about 300ppbv in December and \u0000January and gradually reduces to about 220ppbv and 170ppbv in March and April respectively. This \u0000trend was observed in the ten years studied. It could be suggested thus that an average 35% to 45% \u0000decrease in December/January CO fluxes accumulation is a pointer to the beginning of the next \u0000planting season in the West African region. It was also observed that as the background CO flux \u0000dwindled, the locations of high CO concentrations due to fossil fuel combustions and other \u0000anthropogenic activities were more distinct in comparison to the rest of the region.","PeriodicalId":7661,"journal":{"name":"American Journal of Scientific and Industrial Research","volume":"02 1","pages":"198-202"},"PeriodicalIF":0.0,"publicationDate":"2012-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85940141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Geophysical investigation of road pavement instability along part of Akure-Owo express way, Southwestern Nigeria 尼日利亚西南部Akure-Owo高速公路部分路段路面失稳的地球物理研究

American Journal of Scientific and Industrial Research Pub Date : 2012-08-01 DOI: 10.5251/AJSIR.2012.3.4.191.197

I. Adeyemo, G. Omosuyi

{"title":"Geophysical investigation of road pavement instability along part of Akure-Owo express way, Southwestern Nigeria","authors":"I. Adeyemo, G. Omosuyi","doi":"10.5251/AJSIR.2012.3.4.191.197","DOIUrl":"https://doi.org/10.5251/AJSIR.2012.3.4.191.197","url":null,"abstract":"Integrated surface geophysical methods were used in investigating causes of pavement instability along a portion of Akure-Owo expressway, southwestern, Nigeria. The methods comprise of ground magnetic profiling, Very Low Frequency Electromagnetic (VLF-EM) profiling and geoelectric sounding. The magnetic profile shows a drop below 31500nT at distance 100m and above 32500nT at distances 140 and 310m, these drops in value could correspond to lithological contacts or bedrock depressions. The combined plots of raw real and filtered real VLF-EM data show conductive zones at distances 70m, 230240m and 350-360m, which could be indicative of fractured zones or conductive clay materials. The 2-D geoelectric section shows bedrock depressions at distance 80-160m (stable segment) and 240-360m (unstable segment), while bedrock fractures was delineated beneath VES points 1, 3, 5 and 10, corresponding to distances 0, 80m, 160m and 400m respectively. The topsoil resistivity varies from 83 to 865 ohm-m, while resistivity in the weathered layer materials ranges from 182-1139ohm-m along the stable segment and 27-262ohm-m along the unstable segment. The low resistivity values observed beneath the unstable segment are typical of expansive clay. Thus the instability of the road pavement along the studied portion of the road is probably precipitated by the presence of near surface bedrock depressions, occupied by low resistivity weathered materials, typical of expansive clay and sandy clay, adjudged unsuitable construction materials.","PeriodicalId":7661,"journal":{"name":"American Journal of Scientific and Industrial Research","volume":"68 1","pages":"191-197"},"PeriodicalIF":0.0,"publicationDate":"2012-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84097003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

A new representation of the riemann zeta function via its functional equation 黎曼ζ函数的一个新的表示形式，通过它的函数方程

American Journal of Scientific and Industrial Research Pub Date : 2012-08-01 DOI: 10.5251/AJSIR.2012.3.4.221.225

O. Enoch, D. Ogundipe

引用次数: 1

Effect of bamboo leaf ash on cement stabilization of Makurdi shale for use as flexible pavement construction material 竹叶灰对马库尔地页岩柔性路面施工材料水泥稳定性的影响

American Journal of Scientific and Industrial Research Pub Date : 2012-06-01 DOI: 10.5251/AJSIR.2012.3.3.166.174

A. Iorliam, I. Agbede

{"title":"Effect of bamboo leaf ash on cement stabilization of Makurdi shale for use as flexible pavement construction material","authors":"A. Iorliam, I. Agbede","doi":"10.5251/AJSIR.2012.3.3.166.174","DOIUrl":"https://doi.org/10.5251/AJSIR.2012.3.3.166.174","url":null,"abstract":"A study was carried out on the cement stabilization of Makurdi shale treated with bamboo leaf ash (BLA), for use as flexible pavement construction material. Classification, Compaction, Consistency, California Bearing Ratio (CBR) and unconfined compressive strength (UCS) tests, were conducted on Makurdi shale specimen treated with Cement and BLA in combined incremental order of 2 % up to 14 % cement, and 4 % up to 20 % BLA of dry weight of soil sample respectively. Results of tests showed that Makurdi shale can be classified as an A-7-6, CH and high swell potential soil by the AASHTO, USCS and NBRRI classification systems respectively. The plasticity index (PI) reduced from 39.4 % for untreated Makurdi shale to 4.7 % at 14 % cement + 20 % BLA. Maximum dry density (MDD) of untreated shale increased from 1.49 Mg/m 3 to a peak value of 1.80 Mg/m 3 at 0 % BLA + 14 % cement. While, the optimum moisture content (OMC) of shale increased from 14.5 % to 33.1 % at 14 % Cement + 20 % BLA. Maximum soaked CBR and 7 day UCS values of 80 % and 1783.9 kN/m2 was obtained at 14 % Cement + 20 % BLA. Based on the results of the different tests, the use of Makurdi shale treated with 14 % cement + 20 % BLA are recommended for use as sub-base materials in flexible pavement.","PeriodicalId":7661,"journal":{"name":"American Journal of Scientific and Industrial Research","volume":"47 1","pages":"166-174"},"PeriodicalIF":0.0,"publicationDate":"2012-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84304072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 18

Effects of fruit size and initial storage temperature on the heat of respiration of dacryodes edulis 果实大小和初始贮藏温度对毛竹呼吸热的影响

American Journal of Scientific and Industrial Research Pub Date : 2012-06-01 DOI: 10.5251/AJSIR.2012.3.3.150.156

O. Ijabo, S. Obetta

{"title":"Effects of fruit size and initial storage temperature on the heat of respiration of dacryodes edulis","authors":"O. Ijabo, S. Obetta","doi":"10.5251/AJSIR.2012.3.3.150.156","DOIUrl":"https://doi.org/10.5251/AJSIR.2012.3.3.150.156","url":null,"abstract":"Fresh fruits of Dacryodes edulis, also called African pears, in Markudi were characterized in terms of eight physical parameters namely length, mid-length diameter, fruit volume, weight and density, pulp thickness, pulp and seed weight. These were correlated with each other. Then a 3x6 two-factor experiment used to test for effects of initial storage temperature and fruit size on heat of respiration (HOR). HOR was determined by direct measurement of temperature difference in a closed chamber using a thermocouple. It was observed that the pears were of the small size class with thin pulp. Three parameters have high positive correlation with both pulp weight and thickness. Again it was found that size of pears has no significant effects on HOR at α=0.05 while initial temperature has significant effect on HOR. The HOR of pears at 20, 30 and 40°C were 0.0004150, 0.001146 and 0.002480 W/kg respectively while the Q10 values in the temperature ranges of 20 to 30 and 30 to 40C were 2.76093 and 2.1641 respectively. Based on the values of HOR and Q10 of African pears it is safe to store at 20°C whereas an increase in storage temperature of 10°C or 20°C could accelerate spoilage three or five times.","PeriodicalId":7661,"journal":{"name":"American Journal of Scientific and Industrial Research","volume":"272 1","pages":"150-156"},"PeriodicalIF":0.0,"publicationDate":"2012-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77887636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative studies of silicon from rice husk ash and natural quartz 稻壳灰与天然石英中硅的比较研究

American Journal of Scientific and Industrial Research Pub Date : 2012-06-01 DOI: 10.5251/AJSIR.2012.3.3.146.149

A. Onojah, A. Amah

引用次数: 19

Contribution of the study of the properties of carbenes with advanced quantum chemistry calculations: geometries 用先进的量子化学计算对碳烯性质研究的贡献:几何学

American Journal of Scientific and Industrial Research Pub Date : 2012-06-01 DOI: 10.5251/AJSIR.2012.3.3.128.145

L. Alao, L. Bede

{"title":"Contribution of the study of the properties of carbenes with advanced quantum chemistry calculations: geometries","authors":"L. Alao, L. Bede","doi":"10.5251/AJSIR.2012.3.3.128.145","DOIUrl":"https://doi.org/10.5251/AJSIR.2012.3.3.128.145","url":null,"abstract":"The purpose of this work is to determine the geometric parameters of methylene and six (6) analogues in the first electronic states: singlet state (S0) and triplet state (T1) with advanced quantum chemistry methods for a better knowledge of their structures. For this reason, we used Hartree-Fock (HF), MP2, B3LYP, G3, CBS Q and CBS APNO levels of theory associated with correlated Dunning basis set (cc-pVTZ), using the Gaussian 03 suite of programs. According to this study, we observe that C H bond lengths are always larger in the S0 state than in the T1 state for the methylene; according to the results of all computational methods used. For C X (X = Cl) bond, we have the same behavior as for C H bond in the methylene. When X = F, we have an opposite behavior. Indeed, C X bond is always longer in the state T1 than in the state S0. Concerning bond angles, we observe that, the angle XCY is always smaller (100 ° 110°) in the S0 state than the T1 one (118° 135°). The valence angle increases from F to Cl; this may be explained both by the decrease of electronegativity and the steric hindrance of atoms becoming increasingly large. In the particular case of the monohydroxycarbene and dihydroxycarbene, we have a slightly more complex geometry than methylene and group of the halogenocarbenes because here, a dihedral angle is in addition to other internal drawcords.","PeriodicalId":7661,"journal":{"name":"American Journal of Scientific and Industrial Research","volume":"74 1","pages":"128-145"},"PeriodicalIF":0.0,"publicationDate":"2012-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85932229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development and validation of instrument for assessing practical skills in fault diagnoses and repairs of radio and television systems in Nigerian technical colleges 开发和验证用于评估尼日利亚技术学院无线电和电视系统故障诊断和维修的实用技能的仪器

American Journal of Scientific and Industrial Research Pub Date : 2012-06-01 DOI: 10.5251/AJSIR.2012.3.3.181.190

P. Okwelle, Okeke Benchuks

引用次数: 4

Derivation of New Non-Standard Finite Difference Schemes for Non-autonomous Ordinary Differential equation 非自治常微分方程新非标准差分格式的推导

American Journal of Scientific and Industrial Research Pub Date : 2012-06-01 DOI: 10.5251/AJSIR.2012.3.3.122.127

E. Ibijola, A. Obayomi

引用次数: 2

Dissolution kinetics and mechanisms of reaction of Udi clay in nitric acid solution 乌地粘土在硝酸溶液中的溶解动力学及反应机理

American Journal of Scientific and Industrial Research Pub Date : 2012-06-01 DOI: 10.5251/AJSIR.2012.3.3.115.121

R. Ajemba, O. Onukwuli

引用次数: 17