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Search Results: 1 - 10 of 592736 matches for " J. M. "
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Development of Analytical Model for Modular Tank Vehicle Carrying Liquid Cargo  [PDF]
M. Toumi, M. Bouazara, M. J. Richard
World Journal of Mechanics (WJM) , 2013, DOI: 10.4236/wjm.2013.32010
Abstract:

The study of dynamics of tank vehicles carrying liquid fuel cargo is complex. The forces and moments due to liquid sloshing create serious problems related to the instability of tank vehicles. In this paper, a complete analytical model of a modular tank vehicle has been developed. The model included all the vehicle systems and subsystems. Simulation results obtained using this model was compared with those obtained using the popular TruckSim software. The comparison proved the validity of the assumptions used in the analytical model and showed a good correlation under single or double lane change and turning manoeuvers.

The Primary Radical of a Submodule  [PDF]
Lamis J. M. Abulebda
Advances in Pure Mathematics (APM) , 2012, DOI: 10.4236/apm.2012.25049
Abstract: In this paper we introduced a definition for the primary radical of a submodule with some of its basic properties. We also define the P-radical submodule and review some results about it. We find a method to characterize the primary radical of a finitely generated submodule of a free module.
On Co-Primarily Packed Modules  [PDF]
Lamis J. M. Abulebda
Advances in Pure Mathematics (APM) , 2015, DOI: 10.4236/apm.2015.54022
Abstract:

Let R be a commutative ring with 1, and M is a (left) R-module. We introduce the concept of coprimarily packed submodules as a proper submodule N of an R-module M which is said to be Coprimarily Packed Submodule. If \"\" where Na is a primary submodule of M for each \"\", then \"\" for some \"\". When there exists \"\" such that \"\"; N is called Strongly Coprimarily Packed submodule. In this paper, we list some basic properties of this concept. We end this paper by explaining the relations between p-compactly packed and coprimarily packed submodules, and also the relations

Understanding the Sociocultural Health Belief Model Influencing Health Behaviors among Saudi Stroke Survivors  [PDF]
Mohammed M. J. Alqahtani
Neuroscience & Medicine (NM) , 2015, DOI: 10.4236/nm.2015.64023
Abstract: Understanding patients’ beliefs of stroke, especially that cultural model which influences the medical management, is important. Professionals normally hold medical knowledge only about stroke, rather than the patients’ perceptions, which leads to limitations in cultural competency. Little is known about Saudi stroke survivors’ beliefs and behaviors related to their strokes. Methods: A qualitative methodology was used to collect in-depth information from stroke survivors. From March 2010 to October 2014, 45 stroke survivors were recruited from outpatient rehabilitation clinic at King Fahad Medical City (KFMC-RH), during their follow-up treatments. Results: Thematic content analysis yielded four major themes of the causes of stroke: medical, cultural, psychological and environmental. Three major themes were determined regarding stroke interventions: medical, lifestyle and behavioral, as well as cultural interventions. Stroke is most likely to be associated with a wide range of cultural beliefs by stroke survivors, leading them to cultural behaviors and management. All of these cultural interventions were typically used as an adjunct rather than an alternative to medical care. Conclusions: Health professionals need to be aware that cultural beliefs and their management are common problems for stroke survivors undergoing rehabilitation in a hospital. This study could be one step forward to help health professionals become culturally competent when working with stroke survivors in a rehabilitation setting in Saudi Arabia.
Mineral phosphate solubilization activity of gluconacetobacter diazotrophicus under P-limitation and plant root environment  [PDF]
J. M. Crespo, J. L. Boiardi, M. F. Luna
Agricultural Sciences (AS) , 2011, DOI: 10.4236/as.2011.21003
Abstract: The ability to solubilize insoluble inorganic pho- sphate compounds by Gluconacetobacter diazotrophicus was studied using different cul-ture approaches. Qualitative plate assays using tricalcium phosphate as the sole P-source showed that G. diazotrophicus produced solu-bilization only when aldoses were used as the C-source. Extracellular aldose oxidation via a pyrroloquinoline quinone-linked glucose dehy-drogenase (PQQ-GDH) is the main pathway for glucose metabolism in G. diazotrophicus. In batch cultures with 5 g l-1 of hydroxyapatite as the P-source and glucose as the C-source, more than 98% of insoluble P was solubilized. No solubilization was observed neither using glyc-erol nor culturing a PQQ-GDH mutant of G. di-azotrophicus. Solubilizaton was not affected by adding 100 mmol l-1 of MES buffer. Continuous cultures of G. diazotrophicus showed significant activities of PQQ-GDH either under C or P limi-tation. An intense acidification in the root envi-ronment of tomato and wheat seedlings inocu-lated with a G. diazotrophicus PAL5 was ob-served. Seedlings inoculated with a PQQ-GDH mutant strain of G. diazotrophicus showed no acidification. Our results suggest that G. di-azotrophicus is an excellent candidate to be used as biofertilizer because in addition to the already described plant growth-promoting abili-ties of this organism, it shows a significant mineral phosphate solubilization capacity.
Small Angle Neutron Scattering and X-Ray Diffraction Studies of Nanocrystalline Titanium Dioxide  [PDF]
M. Nasir Khan, J. Bashir
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.29115
Abstract: Nanocrystalline titanium dioxide powder is characterized for phase analysis as well as particle size and its distribution by x-ray diffraction and small angle neutron scattering measurements. Analysis of the SANS data in the momentum transfer range q = 0.1 - 1.8 nm–1 reveals an average particle size of 24.82 nm in good agreement with the particle size determined earlier by transmission electron microscopy. XRD measurement proves co-existence of rutile and anatase phases in this commercial TiO2 nanocrystalline powder.
Finite Element Simulation of a Doubled Process of Tube Extrusion and Wall Thickness Reduction  [PDF]
Ahmed S. M. J. Agena
World Journal of Mechanics (WJM) , 2013, DOI: 10.4236/wjm.2013.35026
Abstract:

This research deals with the forward extrusion process of tubes. In this process, a piercing process was carried out on the billet to produce the tube, followed directly by a reduction in the wall thickness. A specific geometrical shape for the piercing zone and the wall thickness reduction zone were chosen and designed. The effects of the redundant shear strain and the magnitude of the extrusion load were investigated and simulated with the finite element method using Q Form software program. Lead was used as model materials since (if the experiments were carried out at room temperature) it has the similar behavior of the steel at high temperature. The results obtained have shown that at the piercing zone, the lowest values of the extrusion load, the redundant strain, the total strain and the finite element effective strain were when a piercing tool (mandrel) of (C = 1.1) was used. While, at the die zone, the lowest values of the extrusion load, the redundant strain, the total strain was when a die of (C = 0.9) was used.

The Ratcheting Behaviour of Stainless Steel Pressurized Piping Elbows Subjected to Dynamic Out-of-Plane Moments  [PDF]
S. J. Zakavi, M. Nourbakhsh
Modern Mechanical Engineering (MME) , 2014, DOI: 10.4236/mme.2014.43012
Abstract:
In this paper the ratcheting behavior of four pairs of stainless steel elbows is studied under conditions of steady internal pressure and dynamic conditions that induced out-of-plane external moments at frequencies typical of seismic excitations. The finite element analysis with the nonlinear kinematic hardening model has been used to evaluate ratcheting behavior of the piping elbows under mentioned loading condition. Material parameters have been obtained from several stabilized cycles of specimens that are subjected to symmetric strain cycles. The direction of maximum strain is at about 45° between the hoop and axial directions. The results show that the direction of highest ratcheting is along the hoop direction rather than the direction of maximum principal strain. Also, the initial rate of ratcheting is large and then it decreases with the increasing cycles. Also, the FE method gives over estimated values compared with the experimental data.
Pyruvate-Dependent Changes in Neutrophil Amino- and Alpha-Keto Acid Profiles or Immunity: Which Mechanisms Are Involved?  [PDF]
M. Deller, D. Mathioudakis, J. Engel, M. G. Dehne, M. Wolff, M. Fuchs, G. J. Scheffer, J. Mühling
Open Journal of Immunology (OJI) , 2014, DOI: 10.4236/oji.2014.44018
Abstract: High current findings indicate that a substitution with pyruvate can lead to significant alterations or even improvement in neutrophil immunonutrition. However, it is still unknown which intra-cellular pathways might be involved here. Hence, in this study, we investigated whether preincu-bation with an inhibitor of ·NO-synthase (L-NAME), an ·NO donor (SNAP), an analogue of taurine (beta-alanine), an inhibitor of ornithine-decarboxylase (DFMO) as well as a glutamine-analogue (DON), is able to alter the intragranulocytic metabolic response to pyruvate, here for example studied for neutrophil intracellular amino- and α-keto acid concentrations or important neutrophil immune functions [released myeloperoxidase (MPO), the formation of superoxide anions O2- and hydrogen peroxide (H2O2)]. In summary, the interesting first results presented here showed, that any damage of specific metabolic pathways or mechanisms, which seem directly or indirectly to be involved in relevant pyruvate dependent granulocytic nutrient content or specific cellular tasks, could lead to therapeutically desired, but also to unexpected or even fatal consequences for the affected cells. We therefore continue to believe that pyruvate, irrespective of which exact biochemical mechanisms were involved, in neutrophils may satisfy the substantial metabolic demands for a potent intracellular nutrient.
Application of Multi-Step Differential Transform Method on Flow of a Second-Grade Fluid over a Stretching or Shrinking Sheet  [PDF]
M.M Rashidi, Ali J. Chamkha, M Keimanesh
American Journal of Computational Mathematics (AJCM) , 2011, DOI: 10.4236/ajcm.2011.12012
Abstract: In this study, a reliable algorithm to develop approximate solutions for the problem of fluid flow over a stretching or shrinking sheet is proposed. It is depicted that the differential transform method (DTM) solutions are only valid for small values of the independent variable. The DTM solutions diverge for some differential equations that extremely have nonlinear behaviors or have boundary-conditions at infinity. For this reason the governing boundary-layer equations are solved by the Multi-step Differential Transform Method (MDTM). The main advantage of this method is that it can be applied directly to nonlinear differential equations without requiring linearization, discretization, or perturbation. It is a semi analytical-numerical technique that formulizes Taylor series in a very different manner. By applying the MDTM the interval of convergence for the series solution is increased. The MDTM is treated as an algorithm in a sequence of intervals for finding accurate approximate solutions for systems of differential equations. It is predicted that the MDTM can be applied to a wide range of engineering applications.
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