oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 238 )

2018 ( 1314 )

2017 ( 1264 )

2016 ( 1860 )

Custom range...

Search Results: 1 - 10 of 781225 matches for " C. A. S. "
All listed articles are free for downloading (OA Articles)
Page 1 /781225
Display every page Item
Relative effectiveness of organic and inorganic nutrient sources in improving yield, seed quality and nutrient uptake of canola  [PDF]
S. S. Malhi, C. L. Vera, S. A. Brandt
Agricultural Sciences (AS) , 2013, DOI: 10.4236/as.2013.412A001
Abstract:

The proper use of organic and inorganic nutrient sources is important to sustain high levels of crop production, while maintaining or enhancing soil and environmental quality. A 4-year (2009 to 2012) field experiment was established in spring 2009 on a Gray Luvisol (Typic Haplocryalf) loam soil at Star City, Saskatchewan, Canada, to determine the effectiveness of organic/biological (compost, wood ash [fine and granular], alfalfa pellets, distiller grain, thin stillage, glycerol, fish food additive, Penicillium bilaiae), inorganic/mineral (granular-gypsum, rapid release elemental S [RRES], rock phosphate [granular and fine]) and chemical/synthetic (granular-ammonium nitrate, triple super phosphate and potassium sulphate) nutrient sources (amendments/chemicals) in improving seed yield, straw yield, seed quality and nutrient uptake (N, P, K and S) in seed + straw of canola. Combined application of N, P and S chemical fertilizers (NPS) produced considerably greater seed yield, straw yield and nutrient uptake of canola compared to the unamended control in all four years. In treatments receiving only organic amendments, thin stillage produced the greatest seed yield, straw yield and nutrient uptake in all years, and it was similar to the NPS balanced fertilizer treatment, while fish food additive and distiller grain dry of wheat in 2009, 2011 and 2012, distiller grain dry of corn in 2009 and 2012, and compost and alfalfa pellets in 2011 and 2012 produced significantly greater seed yield, straw yield and nutrient uptake, when compared to the control. In treatments where chemical fertilizers were also applied, in addition to organic amendments, ap-

Behaviour of Thermodynamic Models with Phase Change Materials under Periodic Conditions  [PDF]
A. C. Sparavigna, S. Giurdanella, M. Patrucco
Energy and Power Engineering (EPE) , 2011, DOI: 10.4236/epe.2011.32019
Abstract: We study the thermal behaviour of some models in a steady periodic regime. The aim is to simulate the be-haviour of small environments at the outermost part of our planet, subjected to the periodic solar radiation. Our approach is based on a method using lumped elements or volumes that simplifies the description of spa-tially distributed physical systems, through a topology consisting of discrete entities. Our models include some parts acting as energy storage systems, made with Phase Change Materials (PCMs). The storage is based on latent heats: the energy is stored during the melting and recovered during the solidification of the PCM substance. The simulation with lumped elements shows some interesting behaviours of temperatures.
Mica Filled PVC Composites: Performance Enhancement in Dielectric and Mechanical Properties with Treated/Untreated Mica of Different Particle Size and Different Concentration  [PDF]
S. P. Deshmukh, A. C. Rao
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2012, DOI: 10.4236/jmmce.2012.112014
Abstract: Polyvinyl chloride (PVC) of different grades is the second most commonly used polymer for fabrication of electric cables and wires after polyethylene. Cables of domestic and industrial use of various capacities are fabricated using different compounds of PVC. Mica is useful particulate filler extensively used to enhance the performance of many polymeric materials. It surface resistance and arc resistance improving its mechanical properties. In the present research work mica filled PVC composites of different concentrations were prepared using untreated and surface treated water ground mica of different particle size. Mica filled PVC composites were compounded for various compositions and test samples were prepared using compression moulding process. These samples were tested for electrical insulation and mechanical properties. The results shows enhancement in dielectric properties with improvement in Young’s modulus, stiffness, reduction in elongation at break and slight increase in shore D hardness of composites. Scanning electron microscopy was used to test the morphology of the samples which has shown proper distributions and adhesion of the filler mica in PVC matrix. There was some effect of surface treatment of mica on its mechanical and dielectric properties of the composite.
Typical Hydraulic Properties of Deep Aquifers of Niger Delta from Pumping Test Data  [PDF]
S. A. Ngah, C. L. Eze
Journal of Geoscience and Environment Protection (GEP) , 2017, DOI: 10.4236/gep.2017.511010
Abstract: The hydraulic properties of deeper Coastal Plain Sands, which form the main aquifer in the Niger Delta, were investigated around Eleme, Rivers State. The intent was to find out if frequent well failure was as a result of the aquifer not having enough transmitting capacity to sustain the huge withdrawal necessary for Eleme and its environs where demand for groundwater withdrawal is very high because Eleme axis serves as a major industrial axis of River State or whether the frequent well failure was due to inefficient well construction practice. Constant discharge pumping tests were conducted in 8 deep borehole (250 - 310 m). Data generated during the test were analysed using Cooper-Jacob’s straight line method. The calculated transmissivity of the aquifers ranged from 1324 m2/day - 5815 m2/day. These values when compared with transmissivity values elsewhere indicate that the aquifers in the study area have excellent water yielding properties, plotting within the range of “Very Good” in water transmitting capacity scale. Coefficient of permeability ranged from 13.65 m/d - 59.9 m/d. Coefficient of Storage ranged from 28.2 × 10-5 - 29.1 × 10-5 while the Specific capacities of the wells ranged from 48.75 3 - 78.13 m3/d/m. It is concluded that the deep aquifers of the Niger Delta do possess the capacity to produce and sustain large groundwater withdrawal. It is further recommended that competent drilling contractors be engaged in deep well construction in the area.
The Behcet’s Disease: An Uncommon Cause of Venous Thrombosis in the Tropical Area: 10 Cases  [PDF]
B. C. Fall, A. C. Ndao, S. Sarr, M. Dieng, S. Ndongo, A. Leye, A. Pouye
Open Journal of Internal Medicine (OJIM) , 2017, DOI: 10.4236/ojim.2017.74020
Abstract: Introduction: The Behcet’s disease is deemed to be scarce in Black Africa where data are still scattered. The purpose of our study is to describe the epidemiological, clinical, paraclinic and evolutive particularities of the patients whose presenting symptoms of the Behcet’s diseases were a venous thrombosis. Patients and Methods: It was a descriptive, multicenter, and cross-sectional study lasting 15 months. We brought together all the cases of the Behcet’s disease revealed by venous thrombosis. The diagnosis was based on clinical criteria of the international group of study of the Behcet’s disease in 2007. Results: We have grouped 10 revealing thrombosis cases of the Behcet’s diseases during our study period. The average age was 34. The average wait period between the appearances of the early symptoms and the diagnosis of the very disease was 30 months. The admission motives were the abdominal pain (2 cases), a thrombophlebitis of the lower limb (2 cases), headaches (1 case), coma (1 case), a thrombophlebitis of the upper limb (3 cases). The thrombotic symptoms were exclusively venous-located. The seats of the thrombosis were the vena cava superior in 30% of the cases, the vena cava inferior in 20% of the cases, the veins of the lower limb in 20% of the cases, the cerebral vein in 20% of the cases, and the auxiliary vein in 10% of the cases. The treatment of the deep venous thrombosis consisted in all the cases of an effective anticoagulation associated with the colchicine. Primarily, the corticotherapy with a high dose was used in all the patients. One of them in the comatose stage, manifesting both cerebral thrombophlebitis and aseptic meningitis, had died. Conclusion: Behcet’s disease is a disease of the young adult, but it must be evoked even in old age, with a view to appropriate management, in order to avoid the complications of the disease. Although it is rare in our regions, it should be sought in the etiological assessment of venous thrombosis whatever the location.
The Influence of Dewey’s Pedagogy in the Training of Basic Education Teachers of the Federal University of Amapá-Brazil  [PDF]
J. C. Sá-Oliveira, A. C. E. C. Campos, A. S. Araújo, A. A. D. Alberto
Creative Education (CE) , 2017, DOI: 10.4236/ce.2017.88086
Abstract: The purpose of this study was to identify the influence of Dewey’s pedagogy in the praxis of teacher-students in formation in the National Teacher Training Plan of Brazil, as well as to identify and reveal to these students the influences of this philosopher in the discipline theory and practice of teaching of Sciences. The methodological approach of the study was qualitative and quantitative, involving 65 student-teachers who were fulfilling this discipline. The research trajectory began with the use of questionnaires on world education theorists, explaining Dewey’s theory to the evaluation of the plans developed by the student-teachers, observing indications pertinent to Dewey’s pedagogy. The results showed that students did not know Dewey’s educational ideas, although they used them at various points in their pedagogical activities. The influence of the ideas of this theorist in the discipline was evident in the development of the plans elaborated by the students, without excluding the influences of other important theoreticians of world education, as well as in their praxis, whether due to the compliance with the guidelines of the National Curricular Parameters or by the pedagogy intuition that each one has. It was also noticed that there is a gap in the formation of the student-teachers who participated in this study in disciplines that are responsible for presenting the main theorists of national and world education, especially the theoreticians whose ideas are implicit in the Brazilian National Curricular Parameters.
Measurement of Film Thickness on a Curved Surface by Fiber Optic Probe  [PDF]
C. Buffone, A. Glushchuk, C. S. Iorio, F. Dubois
Journal of Electronics Cooling and Thermal Control (JECTC) , 2013, DOI: 10.4236/jectc.2013.31003
Abstract:

A fiber optic sensor is developed in order to measure film thickness along a curved surface. The technique is non-invasive, which has large bandwidth and good spatial resolution (150 μm and 300 μm). A finger type surface is used on top of which liquid is poured down in a continuing manner. Film thickness is measured with the fiber optic probe on 2 different locations along the finger surface. Film thickness of 163 and 79 μm was measured near the top and in the middle of the fin surface.

Data Mining in Biomedicine: Current Applications and Further Directions for Research  [PDF]
S. L. TING, C. C. SHUM, S. K. KWOK, A. H. C. TSANG, W. B. LEE
Journal of Software Engineering and Applications (JSEA) , 2009, DOI: 10.4236/jsea.2009.23022
Abstract: Data mining is the process of finding the patterns, associations or relationships among data using different analytical techniques involving the creation of a model and the concluded result will become useful information or knowledge. The advancement of the new medical deceives and the database management systems create a huge number of data-bases in the biomedicine world. Establishing a methodology for knowledge discovery and management of the large amounts of heterogeneous data has become a major priority of research. This paper introduces some basic data mining techniques, unsupervised learning and supervising learning, and reviews the application of data mining in biomedicine. Applications of the multimedia mining, including text, image, video and web mining are discussed. The key issues faced by the computing professional, medical doctors and clinicians are highlighted. We also state some foreseeable future developments in the field. Although extracting useful information from raw biomedical data is a challenging task, data mining is still a good area of scientific study and remains a promising and rich field for research.
Analysis, Modeling and Simulation of a Poly-Bag Manufacturing System  [PDF]
R. A. R. C. Gopura, T. S. S. Jayawardane
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.45034
Abstract: The cost of raw material of poly-bags increases and fluctuates with an unpredictable trend. Further, legal restrictions imposed on some types of polythene products adversely affects for the demand. In this context, entrepreneurs engaging in poly-bag manufacturing face major challenges. With the purview of optimizing the poly-bag manufacturing process, authors attempted to analyze, model and simulate the poly-bag manufacturing process in the light of posed challenges. This paper presents preliminary analysis, modeling and simulation strategies of a poly-bag manufacturing system. In addition, a risk prioritization method is proposed in the preliminary analysis and also a simulation tool is developed.
Expression of the Gene Encoding Secretor Type Galactoside 2 α Fucosyltransferase (FUT2) and CD44 Marker in Urogenital Tumors  [PDF]
M. A. Ensinck, N. Lebensohn, S. García Borrás, L. Racca, C. Cotorruelo, C. Biondi
Open Journal of Genetics (OJGen) , 2016, DOI: 10.4236/ojgen.2016.64011
Abstract: The aim of this work was to investigate the FUT2 gene, the secretor status and the expression of CD44 protein in epithelial cells obtain from saliva and urine samples from patients with urogenital tumours. We studied 104 subjects. Half of them had urogenital tumours, while the other half was the healthy control group. We determined the secretor status in saliva with the haemagglutination inhibition technique. We analyzed the FUT2 polymorphism by allele specific oligonucleotide–polymerase chain reaction (ASO-PCR) with specific primers for the G428 allele and the wild type allele of FUT2 gene. We found higher intensity of urogenital disease in the non-secretor group (OR = 3.44). In contrast with the healthy population, 51.6% of the patients with potential malignant urogenital lesions and cancerous lesions were non-secretors. We also investigate by confocal microscopy, the expression of CD44 protein in epithelial cells obtained from urine samples from these patients. The results obtained also showed fluorescence corresponding to the presence of CD44 protein in samples from patients diagnosed with cancer. Our study suggests that the lack of wild type FUT2 gene and a nonsecretor status appear to be an associated risk marker for the development of urogenital tumors. Several mechanisms, based on the properties of CD44 as the major hyaluronan CD44 in cell carcinomas receptor, have been proposed to explain the role of elevated CD44 expression during tumour development and progression. CD44 might be a good candidate as a predictor of prognosis in this group of cancers.
Page 1 /781225
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.