Contributors:A.A. Alsobayel, M.S. Rabea, M.A. Alodan
A total of 720 one day old chicks of three different commercial broiler strains (Isa, Ross and Arbor Acres), were obtained from hatching eggs stored for 0, 7 and 14days under 70–80% relative humidity and 16–18°C. Eighty chicks of each strain and storage period were used in the study. Chicks of each storage period were randomly divided into 4 replicates of 20 chicks in each of equal group weight and randomly allotted to 1m×1.5m pens located in an environmentally controlled house. Birds were fed a starter diet to 3weeks, followed by finisher diet to 5weeks of age, which contain 21.5% and 18.5% crude protein and 2950 and 3100kcal/kg metabolizable energy, respectively. At 5weeks of age, 3 males and 3 females were randomly selected from each replicate, individually weighed and were slaughtered after they have been fasted for 12h. Measurements were made of bird plant weight, carcass weight and its percentage of plant weight, abdominal fat weight, heart, liver and gizzard weights and their percentages of plant and carcass weight. The results of study reported herein revealed that strain and storage period of hatching eggs had a pronounced effect upon most studied traits. The results also showed that broilers of Arbor Acres and those of hatching eggs stored for seven days or less had in general the best carcass traits.
Contributors:M. Hachicha, B. Kahlaoui, N. Khamassi, E. Misle, O. Jouzdan
Two experiments were carried out to study the effect of the electromagnetic treatment of saline water on seed germination of corn and the response of soil and potato crop irrigated with such water. The experiments were performed under controlled conditions with different water quality and soil texture. The electromagnetic water treatment was applied using Aqua-4D physical water treatment device. Results showed a significant increase in germination rate of corn seedlings watered with electromagnetic-treated saline water (EC=4dSm−1), particularly when water was exposed to electromagnetic fields for 15min. The experiments carried on potato crop with two soil textures, showed a significant increase in tuber yield when irrigated with electromagnetic treated water. It was also observed a significant decrease of soil salinity (ECe), Na+ and Cl− contents of soils irrigated with electromagnetic treated saline water compared to the soils irrigated with non-treated saline water. In contrast, compared to both treatments (control treatment and saline water treatment), the electromagnetic saline water treatment produced non-significant effect on tuber yield, Mg2+ and HCO3-. However, the electromagnetic treatment of saline water increased significantly K+, N and P adsorption in all tissues of potato and decreased significantly the adverse effects of saline water. Based on our results, electromagnetic treatment of saline water can reduce the negative effect of salinity on corn germination and potato crop and increase yield in about 10% in test conditions.
Contributors:Ugochukwu C. Okonkwo, Ejiroghene Onokpite, Anthony O. Onokwai
This study carried out a comparative analysis of the rates of production of biogas from various organic wastes and weeds which enabled the determination of optimal ratio of poultry droppings to domestic wastes. Digester was prepared for the anaerobic fermentation of the domestic wastes and weeds. The gas production did not begin until the 7th day and increased steadily at first, and then increased sharply until it reached its peak on the 18th day before declining. The total gas produced within the 22days of experimentation was 1771cm3. The maximum volume of gas amounting to 809cm3 was produced by the sample containing 50% poultry dropping and 50% weeds. This indicates that this sample possesses the best C/N ratio of all the samples prepared. For restarted digester, gas production began on the 2nd day as against the 7th day with no restarted digester and the gas production peaked earlier.
Contributors:Honglin Guo, Shuaifei Zhao, Xiaoxian Wu, Hong Qi
TiO2/ZrO2 ceramic nanofiltration membranes are successfully fabricated through the polymeric sol-gel route followed by the dip-coating technique. Disk type α-alumina supported mesoporous γ-alumina (pore size: 5 - 6 nm) is employed as the support in dip-coating. The unsupported and supported composite ceramic membranes are systematically characterized and evaluated in terms of phase composition, chemical stability, gas adsorption, molecular weight cut-off (MWCO), membrane pore size, water flux and salt rejection. It is found that the TiO2/ZrO2 ceramic membranes have amorphous phase at 400 and 500 °C, suggesting the high thermal stability. The fabricated membranes have the MWCO of 620 - 860 Da, corresponding to the membrane pore size of 1.2 - 1.5 nm. Relatively low water permeability can be attributed to the low microporosity of the membrane. Donnan exclusion is the dominant transport mechanism of the NF membrane in the single-component system, and salt rejection is closely related to the hydration properties of the ions (e.g., the hydration radius).
Contributors:Elton Ribeiro Resende, Felippe da Silva Leite Cardoso, Israel Teoldo da Costa
O presente estudo teve por objetivo analisar a influência da eficiência do comportamento (EC) e da data de nascimento (DN) sobre o desempenho tático (DT) de jogadores de futebol da categoria sub‐13. A amostra foi composta por 100 jogadores que fizeram 5.213 ações táticas. Usou‐se o FUT‐SAT para a coleta e análise dos dados. Foi usado o teste de regressão multinomial e adotou‐se p<0,05. Verificaram‐se associações positivas entre a EC e o DN para os princípios “espaço”, “contenção” e “equilíbrio” e entre a DN e o DT ofensivo para os jogadores do segundo quartil. Concluiu‐se que uma melhor EC nos princípios “espaço”, “contenção” e “equilíbrio”, assim como a DN dos indivíduos, são fatores determinantes para o desempenho tático dos jogadores.
This study was carried out in the Food Science Department, Agriculture College, Basrah University to investigate the effect of different chitosan concentrations on drinking water quality. The studied parameters were turbidity, TDS, electrical conductivity and pH. The results showed that the turbidity, TDS, electrical conductivity and pH have been decreased with the increase of chitosan concentration. When chitosan concentration increased from 0 to 1g 100ml−1, the turbidity, TDS, electrical conductivity and pH were decreased from 1.98 to 0.98 NTU, 5.67 to 4.13gL−1, 10.18 to 5.27mScm−1, 6.1 to 5.71 respectively. The linear equations have represented the relationship between all parameters and chitosan concentration. However, the total bacteria count, total coliform bacteria, Staphylococci, Fecal coliform bacteria and Vibrio spp. have been eliminated completely by using Chitosan concentration of 0.8, 0.4, 0.8, 0.2 and 0.2g100ml−1 respectively.
Presenting the composite deck, which consists of concrete slab with profiled steel sheets fixed to the top layer of Double Layer Grid (DLG), proved its great efficiency in increasing the load carrying capacity for this type of structures. Earlier studies concluded that the application of the prescribed composite action had solved many problems facing the spread of DLG structures such as their prone to collapse in a progressive manner besides their suitability to be used only as roof covering structures. In addition, the application of the composite action introduced an economical solution due to considerable savings in steel material used in building the top layer of the DLG structures. However, openings in the deck are needed for architectural purposes such as passing service ducts, day-lighting panels or passing shear walls or continuous structural elements. Adding such openings in the deck affects the efficiency of the composite deck in carrying the assigned loads especially if the openings are being added after the construction is completed. The current research introduced experimental tests along with numerical investigation using ABAQUS software for composite deck space trusses with common cases of support patterns and different deck opening locations. The study shows the obvious effect of the existence of openings and their locations on the load carrying capacity and ductility of DLG space structures.
Contributors:Weicai Wang, Yang Gao, Pablo Iribarren Anacona, Yanbin Lei, Yang Xiang, Guoqing Zhang, Shenghai Li, Anxin Lu
Glacial lake outburst floods (GLOFs) have recently become one of the primary natural hazards in the Himalayas. There is therefore an urgent need to assess GLOF hazards in the region. Cirenmaco, a moraine-dammed lake located in the upstream portion of Zhangzangbo valley, Central Himalayas, has received public attention after its damaging 1981 outburst flood. Here, by combining remote sensing methods, bathymetric survey and 2D hydraulic modeling, we assessed the hazard posed by Cirenmaco in its current status. Inter-annual variation of Cirenmaco lake area indicates a rapid lake expansion from 0.10±0.08km2 in 1988 to 0.39±0.04km2 in 2013. Bathymetric survey shows the maximum water depth of the lake in 2012 was 115±2m and the lake volume was calculated to be 1.8×107m3. Field geomorphic analysis shows that Cirenmaco glacial lake is prone to GLOFs as mass movements and ice and snow avalanches can impact the lake and the melting of the dead ice in the moraine can lower the dam level. HEC-RAS 2D model was then used to simulate moraine dam failure of the Cirenmaco and assess GLOF impacts downstream. Reconstruction of Cirenmaco 1981 GLOF shows that HEC-RAS can produce reasonable flood extent and water depth, thus demonstrate its ability to effectively model complex GLOFs. GLOF modeling results presented can be used as a basis for the implementation of disaster prevention and mitigation measures. As a case study, this work shows how we can integrate different methods to GLOF hazard assessment.
Contributors:Brian C. Thiede, Daniel T. Lichter, Tim Slack
A secure job that pays above-poverty wages is a fundamental economic underpinning of a good life, but one that is absent or precarious for many workers in the rural United States. This paper examines the link between work and poverty in rural America, drawing comparisons over time and in relation to national averages and conditions in urban areas. Using data from the 2001 to 2014 Current Population Surveys, we address three analytic objectives. First, we track changes in the share of poor householders in work, and compare the prevalence of work between the rural and urban poor. Second, we estimate trends in the share of rural and urban workers who are poor, and highlight key social and demographic differentials. Third and finally, we estimate a series of logistic regression models to assess whether and to what extent rural-urban and temporal differences can be explained by the composition of the workforce and changes therein. Results show that an increasing share of the rural poor are out of work, and that the risk of poverty among those who are employed has also increased. While some of the longstanding rural disadvantage appears to have moderated in recent years, these changes are largely due to declining conditions in urban areas. Overall, our results support pessimistic conclusions about the economic status of rural America's workforce, and the ability of rural American's to meet the basic requisites of the good life through work.
The ecological, economical, and agricultural benefits of accurate interpolation of spatial distribution patterns of soil organic carbon (SOC) are well recognized. In the present study, different interpolation techniques in a geographical information system (GIS) environment are analyzed and compared for estimating the spatial variation of SOC at three different soil depths (0–20cm, 20–40cm and 40–100cm) in Medinipur Block, West Bengal, India. Stratified random samples of total 98 soils were collected from different landuse sites including agriculture, scrubland, forest, grassland, and fallow land of the study area. A portable global positioning system (GPS) was used to collect coordinates of each sample site. Five interpolation methods such as inverse distance weighting (IDW), local polynomial interpolation (LPI), radial basis function (RBF), ordinary kriging (OK) and Empirical Bayes kriging (EBK) are used to generate spatial distribution of SOC. SOC is concentrated in forest land and less SOC is observed in bare land. The cross validation is applied to evaluate the accuracy of interpolation methods through coefficient of determination (R2) and root mean square error (RMSE). The results indicate that OK is superior method with the least RMSE and highest R2 value for interpolation of SOC spatial distribution.