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Plastic multilayered closure versus orthopedic surgeon closure after spinal instrumentation in pediatric neuromuscular scoliosis

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World Journal of Pediatric Surgery 2023年第1期6卷 30-35页

作者： Ekene u Ezeokoli Poornima l Tamma Neritan Borici Ifeoma Inneh Edward P Buchanan Brian g Smith Department of Orthopedic Surgery Texas Children's HospitalHoustonTexasUSA Baylor College of Medicine HoustonTexasUSA Department of Plastic Surgery Texas Children's HospitalHoustonTexasUSA Department of Orthopedic Surgery Baylor College of MedicineHoustonTexasUSA

Objective To compare wound complication rates between orthopedic closure(OC)and plastic multilayered closure(PMC)in patients undergoing primary posterior spinal fusion for neuromuscular scoliosis(NMS).We hypothesize that multilayered closure will be associated with better postoperative *** We collected data on pediatric patients diagnosed with NMS who underwent first time spinal instrumentation between 1 January 2018 and 31 May *** demographics,length of surgery,spinal levels fused and operative variables,wound complication rate,treatments,and need for wound washout were reviewed in depth and *** In total,86 patients were reviewed:46 with OC and 40 with *** was a significant increase in operating room(Or)time with PMC compared with OC(6.7±1.2 vs 7.3±1.3,p=0.016).There was no difference in complication rate,mean postoperative day of complication or unplanned return to the Or for OC and PMC,*** was a slightly significant increase in the number of patients going home with a drain in the PMC cohort compared with the OC cohort(2.1%vs 15%,p=0.046).Conclusions PMC demonstrated longer Or times than OC and did not demonstrate a statistically significant reduction in wound complications or unplanned returns to the ***,other studies have demonstrated statistical and clinical significance with these *** programs should review internal patient volumes and outcomes for spinal fusion in NMS patients and consider if PMC after spinal fusions in pediatric patients with NMS or other scoliosis subtypes is an appropriate option in their institution to minimize postoperative wound complications.

关键词： wound pediatric closure

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Chemical storage of hydrogen in synthetic liquid fuels:building block for CO_(2)-neutral mobility

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Clean Energy 2021年第2期5卷 180-186页

作者： r.P.lee l.g.Seidl B.Meyer Iinstitute of energy process engineering and chemical engineering tu bergakademie freibergfuchsmuehlenweg 9d09599 freiberggermany fraunhofer institute for microstructure of materials and systems imws branch lab freiberg—circular carbon technologiesfuchsmuehlenweg 9d09599 freiberggermany

green hydrogen is anticipated to play a major role in the decarbonization of the mobility *** chemical storage in CO_(2)-neutral synthetic liquid fuels is advantageous in terms of safety and reliability compared to other hydrogen storage developments,and thus represents a complementary building block to developments in electric and hydrogen mobility for the low-carbon transition in the mobility *** development is especially relevant for transport sectors which will have no alternatives to liquid fuels in the foreseeable *** this paper,three alternative technological routes for the chemical storage of hydrogen in CO_(2)-neutral synthetic liquid fuels are identified and comparatively evaluated in terms of feedstock potential,product potential,demand for renewable electricity and associated costs,efficiency as well as expected market *** all three routes exhibited similar levels of overall efficiencies,electricity-based liquid fuels in germany are currently limited by the high cost and limited supply of renewable *** contrast,liquid fuels generated from biogenic waste have a constant supply of biogenic feedstock and are largely independent from the supply and cost of renewable electricity.

关键词： CO_(2)-neutral synthetic liquid fuels renewable hydrogen chemical storage waste-to-fuels electricity-based fuels circular carbon technologies

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Energy,momentum and angular momentum in the dyadosphere of a charged spacetime in teleparallel equivalent of general relativity

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Chinese Physics B 2012年第3期21卷 85-91页

作者： gamal g.l.Nashed Department of Mathematics Faculty of ScienceKing Faisal University Mathematics Department Faculty of ScienceAin Shams University Centre for Theoretical Physics The British University in Egypt

We apply the energy momentum and angular momentum tensor to a tetrad field, with two unknown functions of radial coordinate, in the framework of a teleparallel equivalent of general relativity （TEgr）. The definition of the gravitational energy is used to investigate the energy within the external event horizon of the dyadosphere region for the reissner-NordstrSm black hole. We also calculate the spatial momentum and angular momentum.

关键词： Teleparallel equivalent of general relativity energy-momentum tensor angular momen- tum tensor angular momentum

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Five-dimensional teleparallel theory equivalent to general relativity,the axially symmetric solution,energy and spatial momentum

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Chinese Physics B 2011年第11期20卷 102-109页

作者： gamal g.l.Nashed Mathematics Department Faculty of ScienceAin Shams University

A theory of （4＋1）-dimensional gravity is developed on the basis of the teleparallel theory equivalent to general relativity. The fundamental gravitational field variables are the five-dimensional vector fields （pentad）, defined globally on a manifold M, and gravity is attributed to the torsion. The lagrangian density is quadratic in the torsion tensor. We then give the exact five-dimensional solution. The solution is a generalization of the familiar Schwarzschild and Kerr solutions of the four-dimensional teleparallel equivalent of general relativity. We also use the definition of the gravitational energy to calculate the energy and the spatial momentum.

关键词： five-dimensional teleparallel equivalent of general relativity five-dimensional solution energy and spatial momentum

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Spherically symmetric solution in higher-dimensional teleparallel equivalent of general relativity

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Chinese Physics B 2013年第2期22卷 120-127页

作者： gamal g.l.Nashed Center for Theoretical Physics British University in EgyptSherouk City 11837P.O.Box 43Egypt Mathematics Department Faculty of ScienceAin Shams UniversityCairo11566Egypt

A theory of（N＋1）-dimensional gravity is developed on the basis of the teleparallel equivalent of general relativity（TEgr）.The fundamental gravitational field variables are the（N＋1）-dimensional vector fields,defined globally on a manifold M,and the gravitational field is attributed to the *** form of lagrangian density is quadratic in torsion *** then give an exact five-dimensional spherically symmetric solution（Schwarzschild（4＋1）-dimensions）.Finally,we calculate energy and spatial momentum using gravitational energy-momentum tensor and superpotential 2-form.

关键词： (N+1)-dimensional teleparallel equivalent of general relativity five-dimensional solution energy and momentum

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gravitational collapse with standard and dark energy in the teleparallel equivalent of general relativity

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Chinese Physics B 2012年第6期21卷 57-62页

作者： gamal g.l.Nashed Mathematics Department Faculty of ScienceKing Faisal UniversityP.O.Box 380 Al-Ahsaa 31982the Kingdom of Saudi Arabia Mathematics Department Faculty of ScienceAin Shams UniversityCairo11566Egypt Center for Theoretical Physics British University of EgyptSherouk City 11837P.O.Box 43Egypt

A perfect fluid with self-similarity of the second kind is studied within the framework of the teleparallel equivalent of general relativity （TEgr）. A spacetime which is not asymptotically fiat is derived. The energy conditions of this spacetime are studied. It is shown that after some time the strong energy condition is not enough to satisfy showing a transition from standard matter to dark energy. The singularities of this solution are discussed.

关键词： perfect fluid with self-similarity of second kind teleparallel equivalent of general relativ-ity asymptotically nonflat spacetime energy conditions

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gravitational radiation fields in teleparallel equivalent of general relativity and their energies

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Chinese Physics B 2010年第11期19卷 132-139页

作者： gamal g.l.Nashed Mathematics Department Faculty of ScienceAin Shams UniversityCairoEgypt Centre for Theoretical Physics The British University in EgyptEl-Sherouk CityMisr-Ismalia Desert RoadPostal No.11837Egypt

We derive two new retarded solutions in the teleparallel theory equivalent to general relativity （TEgr）. One of these solutions gives a divergent energy. Therefore, we use the regularized expression of the gravitational energymomentum tensor, which is a coordinate dependent. A detailed analysis of the loss of the mass of Bondi space-time is carried out using the flux of the gravitational energy-momentum.

关键词： teleparallel equivalent of general relativity energy-momentum tensor Bondi mass gravitational radiation

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Nonlinear electrodynamics coupled to teleparallel theory of gravity

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Chinese Physics B 2011年第2期20卷 73-82页

作者： gamal g.l.Nashed Mathematics Department Faculty of ScienceAin Shams UniversityCairoEgypt

using nonlinear electrodynamics coupled to teleparallel theory of gravity, regular charged spherically symmetric solutions are obtained. The nonlinear theory is reduced to the Maxwell one in the weak limit and the solutions correspond to charged spacetimes. One of the obtained solutions contains an arbitrary function which we call general solution since we can generate from it the other solutions. The metric associated with these spacetimes is the same, i.e., regular charged static spherically symmetric black hole. In calculating the energy content of the general solution using the gravitational energy momentum within the framework of the teleparallel geometry, we find that the resulting form depends on the arbitrary function. using the regularized expression of the gravitational energy-momentum we obtain the value of energy.

关键词： tetrad theory of gravitation nonlinear electrodynamics spherically symmetric black holes gravitational energy-momentum

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Cosmological application on five-dimensional teleparallel theory equivalent to general relativity

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Chinese Physics B 2012年第10期21卷 122-129页

作者： gamal g.l.Nashed Mathematics Department Faculty of ScienceKing Faisal UniversityP.O.Box 380 Al-Ahsaa 31982the Kingdom of Saudi Arabia Mathematics Department Faculty of ScienceAin Shams UniversityCairo 11566Egypt Center for Theoretical Physics British University of EgyptSherouk City 11837P.O.Box 43Egypt

A theory of（4＋1）-dimensional gravity has been developed on the basis of which equivalent to the theory of general relativity by *** fundamental gravitational field variables are the 5-dimensional（5D） vector fields（pentad）,defined globally on a manifold M,and gravity is attributed to the *** lagrangian density is quadratic in the torsion *** then apply the field equations to two different homogenous and isotropic geometric structures which give the same line element,i.e.,FrW in five *** cosmological parameters are calculated and some cosmological problems are discussed.

关键词： 5D teleparallel equivalent of general relativity 5D solutions cosmological parameters cosmological problems

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Thermal properties of lense-Thirring spacetime in tetrad theory of gravity

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Chinese Physics B 2012年第8期21卷 51-58页

作者： gamal g.l.Nashed Mathematics Department Faculty of ScienceKing Faisal UniversityP.O.Box 380Al-Ahsaa 31982the Kingdom of Saudi Arabia Mathematics Department Faculty of ScienceAin Shams UniversityCairo 11566Egypt Center for Theoretical Physics British University of EgyptSherouk City 11837P.O.Box 43Egypt

using the divergence term appearing in the lagrangian of the teleparallel equivalent of general relativity （TEgr）, we calculate the thermodynamic quantities of four tetrads＇ spacetime reproducing lense-Thirring （l... 详细信息

关键词： Euclidean continuation method thermodynamic quantities first law of thermodynamic,quantum statistical relation

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