General Model for Infrastructure Multi-channel Wireless LANs

In this paper we develop an integrated model for request mechanism and data transmission in multi-channel wireless local area networks. We calculated the performance parameters for single and multi-channel wireless networks when the channel is noisy. The proposed model is general it can be applied to different wireless networks such as IEEE802.11x, IEEE802.16, CDMA operated networks and Hiperlan\2.Comment: 11 Pages, IJCN

eLearning a New Way for Saving: Guild's Survey as a Case Study

In the early days of eLearning, there was an awful lotof hype about expected results from eLearning initiatives. One ofthe biggest was about how much money organizations could savethrough eLearning. ELearning provides increased opportunitiesfor delivering and taking part in learning, but building anddelivering eLearning is typically not as inexpensive as we wereonce promised. Here are some of the more common costsassociated with eLearning: Content development, Course designand development, Project management processes and tools,Authoring and multimedia development tools, Infrastructure,including Learning Management Systems. Although, bettertraining may drive improved performance, many organizationsstill find themselves needing to reduce the costs of designing,building, and delivering eLearning. The main objective of thispaper is discovering how eLearning could cut down the cost fororganizations benefiting from Guild's survey

Structural, Magnetic and Electrical Properties of Co-Doped Barium Monoferrite BaFe2O4

Cobalt-substituted barium monoferrite with theformula BaCoxFe2-xO4 (x = 0.0 – 0.4, step 0.1) has been preparedthrough the sol-gel autocombustion method. Phase purity forprepared samples sintered at 700 and 1050 ̊C was analyzed byX-ray diffraction (XRD) patterns that indicated the formationof the typical orthorhombic phase for the samples. Fouriertransforminfrared (FTIR) spectroscopy was used to investigatethe effect of cobalt doping on the vibrational modes of thestudied samples. Scherrer and Williamson-Hall formulae wereused to define the microstrian and the crystallite size being inthe range of 44.1 to 59.7 nm, which was further confirmed withtransmission electron microscopy (TEM) images. Magneticcharacteristics including magnetic saturation and coercivitywere obtained from hysteresis loops traced using vibratingsample magnetometry (VSM). Magnetic properties werecorrelated with the composition of the prepared samples.Finally, dielectric measurements were operated to furtherconfirm the structural and magnetic analysis

007 Khaled Amrouni et.al,2015-Poster of Petrographic Methods: Integrated Quantitative and Qualitative Petrographic and Diagenetic Methods to define Carbonate Outcrop and Reservoir...

The petrographic and diagenetic lab work of the Cyrenaican Miocene carbonate rocks northeast Libya involves an intensive study of 503 hand samples and their thin sections. 148 samples of the measured field section A1 of 74m thick were selected at 0.5 m intervals and then prepared to be studied. Proper thin sections preparation required insertion of some dyes and chemical treatments. Blue dye was inserted into the epoxy of all thin sections to enhance porosity identification. Alizarin Red-S stain was used to distinguish between calcite and dolomite minerals, and potassium ferricyanide stain was used to differentiate ferroan from non-ferroan carbonate minerals. For the petrographic work, a three part thin section description scheme was established and followed. It includes: 1) quantitative analysis, 2) qualitative analysis, and 3) diagenetic process and their paragenetic sequence. The quantitative part involved determining the type and percentage of grains/fossils, matrix, cement, and pores. The qualitative studies rock textures (fabrics and grain size), sedimentary structures (primary and secondary), and trace fossils. Diagenetic processes includes micritization, dissolution/leaching (pore creations), cementation (pore destruction), compaction (mechanical and chemical), and neomorphism (recrystallization, inversion, and replacement). Through the cross cutting relationship the paragenetic sequence were defined by putting each diagenetic event in its proper relative time order of occurrence. The most important final products of these integrated petrographic and diagenetic methods are curves that define vital reservoir rocks characterizations such as high/low porosity zones and their types, high/low cement zones and their types, grain dominated versus mud dominated zones, high/low diagenetically affected zones and type of diagenesis, bio-zones, dolomite versus calcite zones, carbonate texture curves, dolomite types and zones, and a chart of the paragenetic sequence of the diagenetic events and their processes. In addition, the depositional and diagenetic reservoir properties are interpreted in the sedimentological and sequence stratigraphic context of the studied Cyrenaican Miocene sequence to determine the extent at which the relative sea level changes and tectonics could control the carbonate reservoir properties

Investigation on cohesion and bitumen/aggregate affinity of rubberized porous asphalt by dry process

The purpose of this study is to investigate the effect of crumb rubber on the performance characteristics of porous asphalt mixture in terms of binder/aggregates affinity and mixture cohesion. The recycling of scrap tires in asphalt pavements appears as an important alternative providing a large-scale market. The characteristics of bitumen are very important with regard to service life of porous asphalt pavement. The experimental study consists of two main steps: Step I, sample fabrication by Marshall method with and without crumb rubber (worth mentioning that the mix design was performed in the first stage of the research.) and Step II, was dedicated to testing procedure in in order to investigate on performance characteristics of the porous asphalt mixtures. During the experimental work in accordance to the Cantabro weight loss, to obtain the grade of cohesion between the aggregate and bitumen, the Rolling Bottle Test (RBT) in order to investigate on the effects of CR on bitumen affinity have been conducted and the results were compared. The experimental tests result which has been performed in the laboratory of the University of Bologna shows that adding CR in both Cantabro weight loss and RBT could enhance the cohesion and affinity properties, which represents higher resistance to early raveling and stripping

Effects of methyl prednisolone in early ARDS

Introduction: Glucocorticoid induced down-regulation of systemic inflammation in ARDS is associated with a significant improvement in pulmonary and extrapulmonary organ dysfunction and a reduction in duration of mechanical ventilation and ICU length of stay [1]. We aimed in this study to evaluate the effect of methyl prednisolone when used early in ARDS. Patients and methods: We studied 27 patients with ARDS, we divided them randomly into two groups the first group consists of 18 patients received methyl prednisolone and the other group consists of 9 patients did not receive it. All patients were subjected daily to: history taking and clinical examination, Chest X-ray, routine blood investigation (CBC–LFT–RFT–electrolytes), ABG, Serum lactate, INR, fibrinogen, and aptt, CRP, protein C, protein S, and D-dimer at the beginning and at the end of study. Results: After 7 days there were significant improvements of clinical parameters (pulse, temperature, and systolic blood pressure), peep (one parameter from lung injury score), lactate, D-dimer, AST, and a highly significant improvement of creatinine in the methyl prednisolone group when compared to the control group. After 14 days from starting treatment there were significant improvements of clinical parameters (pulse and systolic BP), ventilator parameters (FIO2, peep, and RR), systemic inflammation markers organ functions (O2sat, lactate, creatinine, WBCs, AST, and GGT) and CRP. And a significant improvement of CX-ray, earlier extubation from mechanical ventilation and improvement of mortality in the methyl prednisolone group when compared with the control group. Conclusion: We conclude that methyl prednisolone when used on first 2 days in ARDS patients improves the LIS, decreases the systemic inflammation, earlier extubation from mechanical ventilation, and decreases the incidence of hospital acquired infection