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Search Results: 1 - 10 of 404451 matches for " Kamoga Omar Lwako M. "
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A Review on Pulp Manufacture from Non Wood Plant Materials
Kamoga Omar Lwako M.
International Journal of Chemical Engineering and Applications , 2013, DOI: 10.7763/ijcea.2013.v4.281
Abstract: There has been a cyclic trend in the production of pulp and paper, alternating between the non-wood and the wood materials. Originally paper wasbeing made from nonwood materials such as papyrus, hemp and textile rags. With the development of technologies for isolating pulp from wood, it resulted in abandoning paper making from many non-wood materials. Since then, it has been cheaper to produce pulp and paper from wood. However, todate the trend is reversing from wood as the major source of pulp for paper making to nonwood materials such as agricultural food crop residues, grasses, shed tree leaves, fibrous shells of fruits and others. This is due to the fact that the supply of wood for pulp is decreasing as a result of deforestation in most part of world, more especially in Uganda while the non-wood materials are more available and can readily be regenerated after a short period.In this paper we have reviewed the trend in pulp and paper production from different non-wood materials since the perception of the paper making technology up todate through literature review and consultations with experts in the area pulp and paper production.
Characteristics and Genesis of the Groundwater Resources Associated with Oil Shale Deposits in the Azraq and Harrana Basins, Jordan  [PDF]
Ali M. Obeidat, Omar Rimawi
Journal of Water Resource and Protection (JWARP) , 2017, DOI: 10.4236/jwarp.2017.92010
Abstract: Upper cretaceous and lower tertiary formations groundwater aquifers are associated with huge reserves of oil shale deposits in Harrana and Azraq Basins are evaluated in terms of water qualities and hydrochemical processes. The oil shale deposits are found within the Muwaqqar Chalk Marl Formation. The Muwaqqar Chalk Marl Formation represents the intermediate formation between the Lower Aquifer Amman Silicified Limestone and the overburden, which represents the overlying Upper Aquifers of Um Rijam Chalk and Wadi Shallala Chalk. This study aimed to improve the understanding of Muwaqqar Chalk Marl Formation as a sealing potential based on water quality and hydrochemical data of the different aquifers. Sixty water samples were collected from Amman Silicified Limestone Aquifer, High Grade Zone of Muwaqqar Chalk Marl Formation and from the overburden of Um Rijam Chalk and Wadi Shallala Chalk aquifers. The evaluations of the main hydrochemical processes affecting the groundwater quality were carried out by interpreting the ionic relationships and the water quality types using Piper and Durov diagrams. Comprehensive statistical analyses (Factor and Cluster Analyses) were conducted on the water quality parameters. The factor analyses can extract four factors from the water quality parameters of the Harrana wells Area-1 and for Azraq wells in Area-2. These factors are used to interpret the different geochemical processes affecting the groundwater quality parameters. Cluster analyses divided the Harrana wells into three groups. Cluster I included 26 wells with minimum mean concentrations of cations and anions, while cluster III included the wells with the highest concentrations in the water quality parameters. Cluster II included eight wells with intermediate concentrations. Azraq Area-2 wells are clustered into three groups. Cluster I includes seven wells with lowest water quality (highest concentrations); cluster II includes 12 wells and exhibits the lowest concentrations of ions and cluster III includes five wells that show intermediate ions concentrations. The interpretation indicated that the primary factors controlling the groundwater chemistry of Azraq and Harrana appeared to be dissolution processes of the carbonate rocks containing traces of evaporitic minerals, ion exchange and reversal ion exchange processes. Moreover, the water quality in the study areas is not suitable for drinking purposes.
Effect of garlic powder on performance and lipid profile of broilers  [PDF]
Kamal Jamal Issa, J. M. Abo Omar
Open Journal of Animal Sciences (OJAS) , 2012, DOI: 10.4236/ojas.2012.22010
Abstract: This experiment was conducted to investigate the effect of feeding garlic powder (GP) on the performance, digestibility, digestive organs, carcass cuts and lipid profile of broilers. A total of 270 day-old Cobb-500 chicks were used in the experiment. Birds were partitioned into three experimental groups of 90 birds in each. Each treatment was composed of 6 replicates with 15 birds in each. The control group was fed with a commercial starter and finisher diet. The second and third groups were supplemented with GP at the rate of 0.2% and 0.4% respectively. In the last week of experiment, 18 birds from each experimental group (3 birds per replicate) were used in a metabolic trial. At the time of termination of the experiment, the same number of birds were killed for digestive organs and carcass components measurements. Blood samples from 3 birds per replicate were collected on 3rd, 5th and 6th week post feeding from wing vein for blood lipid profile determination. Total cholesterol (COL), triglycerides (TG), high density lipoprotein (HDL), low density lipoprotein (LDL) levels were determined. Results of this study showed that GP had no significant effects on broilers weight gain, feed intake (FI), feed conversion ratio (FCR), carcass cuts, visceral organs. However, GP decreased (P < 0.05) COL, TG, LDL and increased HDL levels compared to control birds. The dry matter (DM), crude protein (CP) and ether extract (EE) digestibility were improved by feeding GP. It can be concluded that GP could provide positive advantages in broilers performance.
Life-Threatening Pulmonary Embolism: A Multidisciplinary Approach to Diagnosis and Management  [PDF]
Omar M. Lattouf, Kenneth Leeper, Heval Kelli
World Journal of Cardiovascular Surgery (WJCS) , 2013, DOI: 10.4236/wjcs.2013.36038
Abstract: Current treatment of life threatening venous thrombo-embolism (VTE) has been based on general concepts dating to the early 1900s. In this manuscript a general overview of current diagnostic and therapeutic methods of VTE is presented along with the Emory University Affiliated Hospitals’ experience of the surgical treatment of life threatening VTE. We retrospectively analyzed the data of twenty-seven consecutive patients who underwent pulmonary embolectomy on cardiopulmonary bypass from January 1998 through April 2010. Our results showed successful outcomes after urgent or emergent surgical pulmonary embolectomy. It encourages the choice of an early and aggressive surgical approach for large pulmonary emboli in hemodynamically unstable patients.

A New Modification of the Method of Lines for First Order Hyperbolic PDEs  [PDF]
Fatmah M. Alabdali, Huda Omar Bakodah
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.510138

A new modification of the Method of Lines is proposed for the solution of first order partial differential equations. The accuracy of the method is shown with the matrix analysis. The method is applied to a number of test problems, on uniform grids, to compare the accuracy and computational efficiency with the standard method.

Development of Anti-Wear/Antioxidant Additives for High Quality Metalworking Fluid from Waste Petroleum Products  [PDF]
Noura Al Mehbad, A. M. A. Omar
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2014, DOI: 10.4236/jsemat.2014.41006

Surfactants are used for formulation metal working fluids. These fluids are applied to the interface between a cutting tool and the metal working piece to provide friction reduction. In the present paper, poly aromatic ammonium sulphonate and polyaromatic benzyl triethanolamsonium ethoxylate with 6 ethylene oxide units were synthesized and blended with coupling agent like dodecyl alcohol and oleic acid to produce cutting fluid and evaluate as antiwear. Values of surface tension of these additives were measured in oil phase and consequently CMC was determined for all additives and their mixtures in oil phase. The efficiency of these additives depends on their chemical structure and the presence of ether oxygen brings about the association of the surfactant with metal surface, hence very good wetting properties. The antiwear characteristic of surfactants increases with increasing polar linkages in the aromatic moieties forming chelated and coordinated layer. This is due to the increase in the number of sites to chemisorption on the metal surface. The films formed are highly condensed ring aromatic layered structures. These films provide lower wear and depend on the type of surfactants concentration

Frequency-Selective Energy Tunneling in Wire-Loaded Narrow Waveguide Channels
Omar Farooq Siddiqui;Omar M. Ramahi
PIER Letters , 2010, DOI: 10.2528/PIERL10031809
Abstract: Frequency-dependent energy tunneling that results in full transmission of electromagnetic energy through wire-loaded sharp waveguide bends is demonstrated by full-wave simulations. The frequencies at which the tunneling takes place is predicted by a numerical method that involves a variational impedance formula based on Green function of a probe-excited parallel plate waveguide. Analogous tunneling effects have also been previously observed in waveguide bends filled with epsilon-near-zero media. However, since the frequency response in the wire-loaded waveguides can be tailored by simply modifying the lengths of the wires, the phenomenon is scalable over a broad range of frequencies and can be potentially exploited in various filtering and multiplexing applications.
Gardié M,Omar;
Estudios pedagógicos (Valdivia) , 2000, DOI: 10.4067/S0718-07052000000100002
Abstract: the aim of this study was the determination of the general profile of thinking styles of a sample of 1.085 venezuelan professionals, according to the pattern of total brain of herrmann, with the purpose of comparing it with the one obtained previously in a sample of educators coming from all the levels of the venezuelan educational system. the results of the investigation confirm in a general way the hypothesis of the inadequate development of the creative potential in both groups.
El uso de los participantes semánticos en los predicados de cambio de estado del espa?ol: una aproximación basada en corpus
Sabaj M,Omar;
Literatura y lingüística , 2006, DOI: 10.4067/S0716-58112006000100016
Abstract: the study of the semantic participants or thematic roles is a fertile field in the investigation of the so denominated syntactic lexical interface. most of these studies are limited to a formal modeling and, rarely, they are applied to a description of authentic samples of language in use. in this work, on the one hand, we propose a formal model of the participants in the predicates that express a change of state. on the other hand, 9 registers are described and compared in terms of the occurrences of the thematic roles in the before mentioned predicates. the registers that compose the corpus include journalistic texts, oral and written texts, scientific and dissemination texts, among others. from the calculation of difference of proportions, the results show that the use of some participants described in the model turns out to be useful to differentiate part of the registers that compose the corpus
Diagnóstico Laboratorial do Hiperparatiroidismo Primário
Hauache, Omar M.;
Arquivos Brasileiros de Endocrinologia & Metabologia , 2002, DOI: 10.1590/S0004-27302002000100011
Abstract: primary hyperparathyroidism (php) is a frequent endocrinopathy. increased serum calcium levels may be considered as a potential marker for parathyroid autonomy and this explains why php should be routinely investigated in whoever presents with hypercalcemia. high or inappropriately normal pth levels in the presence of hypercalcemia are very suggestive of php. on the other hand, php is very unlikely in the absence of hypercalcemia. extracellular calcium concentrations may be evaluated by the measurement of total or ionized calcium, but the serum protein levels do not affect ionized calcium level. regarding pth, the current methods available detect the "intact" molecule of pth (immunoradiometric and immunochemiluminescent assays), including pth 1-84 and 7-84. recently, assays that only detect the so-called bioactive pth (1-84 pth) are available. pth levels are undetectable in humoral hypercalcemia of malignancy. in short, measuring serum calcium and pth should be enough for the diagnosis of php. to further evaluate a patient with php and its potential bone and renal complications, one can order other exams such as evaluation of renal function, daily urinary calcium excretion, renal ultrassonography and bone densitometry. these exams may be useful to help the physician decide whether surgery should be indicated or not.
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