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OALib Journal期刊

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匹配條件: “ Mthunzi V. Ngcelwane” ,找到相關結果約130461條。
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Non-Operative Treatment of Odontoid Peg Fractures  [PDF]
Falethu M. Sukati, Mthunzi V. Ngcelwane, Maleho Maku
Open Access Library Journal (OALib Journal) , 2020, DOI: 10.4236/oalib.1106132
Abstract: Objective: The aim of this study was to review the results of non-operative treatment of odontoid fractures in Steve Biko Academic Hospital, Pretoria. Methods: Records for all patients treated for odontoid fractures from 2008 to 2018 were reviewed. 28 patients met the study criteria. Demographic data, mechanism of injury, associated injuries, neurology, imaging studies and treatment were reviewed. Results: There were 23 males and 5 females. The average age at presentation was 39.5 years. 25 patients were injured in road traffic accidents. Associated injuries were present in 21 patients, mostly involving the spine and head. 18 fractures were classified as Type II and 15 as Type III. Fracture comminution (5), angulation (6) and translation (10) were noted. Primarily treatment modalities were cones callipers, Philadelphia collar or halo vest. Fracture union was assessed radiologically at 3, 6 and 9 months. Type II and III fractures had high union rates at 6 and 9 months. Significantly displaced fractures had a statistically lower union rate (p = 0.0285) at 6 months. Conclusion: Minimally displaced odontoid Type II and III fractures can be effectively treated non-operatively in young adults. Extent of fracture displacement is the single important factor in non-union rate.
Understanding Social Responsiveness: Portraits of practice at the University of Cape Town
Judith Favish,Sonwabo Ngcelwane
Gateways : International Journal of Community Research & Engagement , 2009,
Abstract: In 2004 the University of Cape (UCT) launched its first annual report on social responsiveness at the university. As a public institution receiving considerable funding from the public purse, it was deemed appropriate that the university should report annually on how it was addressing major development challenges facing the country. The first part of this article describes the process of developing a shared definition of and conceptual clarity about social responsiveness. The second part develops this further by outlining how practices on the ground helped to inform a conceptual framework defining the links between social responsiveness and the other core processes of the university: research and teaching. The third part of the article describes ways to support and reward social responsiveness. Finally, the article assesses the extent to which UCT has been able to institutionalise social responsiveness. The article outlines progress that has been made and suggests that the participative processes employed in the policy development phase have helped lay the foundations for institutionalisation. Despite this, however, challenges remain with respect to ensuring a consistent implementation of the policy across the institution and maximising the impact of social responsiveness on addressing critical challenges facing the country.
Risk factors for perinatal HIV-1 transmission in pregnant women requiring lifelong antiretroviral therapy: A longitudinal study at a tertiary hospital in South Africa
E Bera, N Jwacu, F Pauls, T Mancotywa, N Ngcelwane, Y Hlati
South African Journal of Obstetrics and Gynaecology , 2010,
Abstract: Objectives. To estimate the infant HIV-1 transmission rate and to evaluate risk factors for transmission in pregnant women at an Eastern Cape tertiary hospital requiring lifelong antiretroviral therapy (ART). Methods. Pregnant women who initiated lifelong ART during pregnancy and others who conceived on lifelong ART were followed up antenatally, through delivery, until 6 weeks postpartum. A qualitative HIV-1 DNA polymerase chain reaction (PCR) was done on the infants at 6 weeks. Risk factors evaluated for perinatal HIV transmission included CD4 count, duration of ART, plasma HIV-1 RNA viral load (VL) at delivery, preterm birth, and mode of delivery. Results. Data on 838 women with 858 live births are presented. The median CD4 count was 192 cells/μl, and the median duration of ART was 12 weeks. Of 618 women (73.7%) with VL results at delivery, 555 women (89.8%) had a VL <1 000 copies/ml. HIV-1 DNA PCR was performed on 665 out of 831 infants (80%) from 6 weeks onwards. Transmission occurred in 16 infants (2.4%; 95% confidence interval (CI) 1.4 - 4.0). The transmission rate was 7.8% with maternal plasma VL ≥1 000 copies/ml (p=0.018), 4.2% with duration of ART <10 weeks (p=0.010), and 8.6% with preterm birth (p=0.046). On multivariable regression analysis VL ≥1 000 copies/ml (adjusted odds ratio (AOR) 12.82; 95% CI 1.72 - 95.53) and duration of ART <10 weeks (AOR 4.91; 95% CI 1.40 - 17.18) remained significant predictors of transmission. Conclusions. Maternal plasma VL at delivery and duration of ART are significant independent predictors of perinatal HIV-1 transmission, but transmission can occur with undetectable plasma VL at delivery.
Nonsmooth Optimization Algorithms in Some Problems of Fracture Dynamics  [PDF]
V. V. Zozulya
Intelligent Information Management (IIM) , 2010, DOI: 10.4236/iim.2010.211073
Abstract: Mathematical statement of elastodynamic contact problem for cracked body with considering unilateral restrictions and friction of the crack faces is done in classical and weak forms. Different variational formulations of unilateral contact problems with friction based on boundary variational principle are considered. Nonsmooth optimization algorithms of Udzawa’s type for solution of unilateral contact problem with friction have been developed. Convergence of the proposed algorithms has been studied numerically.
Precessing Ball Solitons as Self-Organizing Systems during a Phase Transition in a Ferromagnet  [PDF]
V. V. Nietz
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.410A3010
Abstract:

Precessing ball solitons (PBS) in a ferromagnet during the first order phase transition is induced by a magnetic field directed along the axis of anisotropy, while the action of the periodic field perpendicular to the main magnetic field has been analyzed. Under these conditions, the characteristics of arising equilibrium PBS are uniquely determined by the frequency of the periodic field, but the solitons with other frequencies are impossible. For such structure, the entropy increase connected with dissipation is compensated by the decrease of the entropy due to the external periodic field. It is shown that the equilibrium PBS are essentially the “self-organizing systems” that can arise spotaneously in a metastable state of ferromagnet.

Movement of Self-Organizing Solitons in Ferromagnet  [PDF]
V. V. Nietz
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.610155
Abstract: Precessing ball solitons (PBS) in a ferromagnet during the first order phase transition induced by a magnetic field directed along the axis of anisotropy, while the additional action of high-frequency field perpendicular to the main magnetic field, are analyzed. It is shown that the spatial motion of solitons, associated with thermal fluctuations in the crystal, does not destroy the equilibrium of self-organized PBS.
Lα Line of Dark Positronium as a Nongravitational Detection of DM  [PDF]
V. Burdyuzha, V. Charugin
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.613187
Abstract: An attempt to predict the new atomic dark matter lines is done on the example of a dark lepton atom-positronium. Its Layman-alpha line with the energy near 3 GeV may be observable if the appropriate conditions are realized. For this we have studied a γ-ray excess in the center of our galaxy. In principle, this excess may be produced by the Lα line of a dark positronium in the medium with Compton scattering. The possibility of observations of an annihilation line (E~300 TeV) of dark positronium is also predicted. Other proposals to observe the atomic dark matter are shortly described. Besides, Hα line (1.3μ) of usual positronum must be observable in the direction on the center of our galaxy.
Randomization of Energy and Momentum in Statistical Mechanics  [PDF]
V. V. Paranjape
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.615223
Abstract: Particle-particle collisions in materials give rise to a particle distribution in energy and momentum in such a way that a most probable distribution is realized. I will show that an evaporating liquid generates a molecular imbalance in the equilibrium energy distribution. The molecular collisions by their inherent nature are able to repair the imbalance and in so doing it is shown that the liquids cool down. Similarly an external electric field creates substantial imbalance in the momentum distribution for the electrons in ionic semiconductors. Electron-electron collisions are able to restore the imbalance and as a consequence, similar to the evaporating liquid, the electron gas loses thermal energy and cools down.
基于稅收能力視角的中國稅制改革 China s Tax Reform Based on the Perspective of Tax Capacity
v
- , 2015,
Abstract: 摘要 稅收能力是研究稅收制度的重要視角,科學判定稅收能力是稅制改革的基本前提。稅收制度決定了既定條件下稅收能力的高低,稅收能力也影響和制約著稅制改革的進程。我國近年來的經濟社會發展改變了經濟運行中各經濟主體的稅收能力及其格局?;诙愂漳芰σ暯?,現行稅收制度在稅制結構、稅制體系、征管制度等方面還存在著與經濟社會發展不相適應之處。為此,稅制改革應基于對目前及未來稅收能力的科學判斷,明確稅制結構優化的方向和路徑,加快地方稅體系建設,進一步完善稅收征管制度。
Lorentz’s Transformations and Gravitation in the Granular Space Theory  [PDF]
V Konushko
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.26053
Abstract: Research into the read structure of space at ways leads to the conclusion on the existence of a privileged (absolute) system of reference, with all the equations remaining invariant about Lorentz’s transformations. The expansion of these transformations makes it possible to obtain easily the Schwarzshild matrix and, also, all the results of Einstein’s theory of gravity. The untangling of the physical meaning of velocity as a measure of relative deformation of elementary space cells eliminates, at last, all the paradoxes of Lorentz’s transformations and allows visual observation of the mechanism of gravity and Coulomb interaction in imaginary experiments.
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