scispace - formally typeset
Search or ask a question
Institution

Academy of Engineering Sciences

EducationKhartoum, Sudan
About: Academy of Engineering Sciences is a education organization based out in Khartoum, Sudan. It is known for research contribution in the topics: Equation of state & Steelmaking. The organization has 68 authors who have published 65 publications receiving 846 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: A new simple explicit two-step method and a new family of predictor–corrector integration algorithms are developed for use in the solution of numerical responses of dynamic problems, avoiding solving simultaneous linear algebraic equations in each time step.
Abstract: A new simple explicit two-step method and a new family of predictor–corrector integration algorithms are developed for use in the solution of numerical responses of dynamic problems. The proposed integration methods avoid solving simultaneous linear algebraic equations in each time step, which is valid for arbitrary damping matrix and diagonal mass matrix frequently encountered in practical engineering dynamic systems. Accordingly, computational speeds of the new methods applied to large system analysis can be far higher than those of other popular methods. Accuracy, stability and numerical dissipation are investigated. Linear and nonlinear examples for verification and applications of the new methods to large-scale dynamic problems in railway engineering are given. The proposed methods can be used as fast and economical calculation tools for solving large-scale nonlinear dynamic problems in engineering.

337 citations

Journal ArticleDOI
TL;DR: In this article, a new dynamic model of vehicle/track interaction is presented, which considers the vehicle and the track as a whole system and couples the vertical interaction with the lateral interaction.
Abstract: SUMMARY A new dynamic model of vehicle/track interaction is presented. The model considers the vehicle and the track as a whole system and couples the vertical interaction with the lateral interaction. The vehicle subsystem is modeled as a multi-body system with 37 degrees of freedom, which runs on the track with a constant velocity. The track substructure is modeled as a discretely supported system of elastic beams representing the rails, sleepers and ballasts. The normal contact forces between wheels and rails are described by Hertzian nonlinear elastic contact theory and the tangential wheel/ rail forces are decided by the creep theory. Numerical results are compared with those of conventional dynamic models of railway vehicles. Applications of the coupling model to the investigation of safety limits against derailment due to the track twist and the combined alignment and cross-level irregularities are reported at the end of the paper.

135 citations

Journal ArticleDOI
TL;DR: In this paper, phase diagrams of water-emulsifiers-oil have been investigated and it was shown that the association of the three compounds into liquid crystalline phases has an effect on the properties of the emulsion.
Abstract: Phase diagrams water-emulsifiers-oil have been investigated. Results show that not only the association of the three compounds into liquid crystalline phases has an effect on the properties of the emulsion but also that the association into micelles of the emulsifier in the oil phase influences both the type and the stability of the emulsion.

61 citations

Journal ArticleDOI
TL;DR: The incidence of injuries following radiation therapy for carcinoma of the uterine cervix is markedly decreased by the administration of alkoxyglycerols, both for less harmful injuries as well as for the more severe ones, i.e. the fistulas.
Abstract: The incidence of injuries following intracavitary and external radiation therapy is markedly decreased in all stages of the disease by the administration of alkoxyglycerols. Complex injuries (due to radiation injury and tumour growth in combination) were reduced to about 1/3 in a group receiving alkoxyglycerols prophylactically, i.e. before, during and after radiation treatment, when compared with a control group. Using non-prophylactic administration of alkoxyglycerols, i.e. during and after radiation treatment, no effect was observed on complex injuries, while--as for the prophylactic group--the injuries due to radiation only, were significantly decreased. The use of so called "increased amount" of radium in the intracavitary irradiator was followed by an unexpectedly high incidence of radiation injuries, which was considerably reduced, however, by alkoxyglycerols, especially when administered prophylactically.

40 citations

Journal ArticleDOI
TL;DR: A regression of tumour growth is observed when alkoxyglycerols are administered prior to radiation treatment of patients suffering from cancer of the uterine cervix by a change in the quotient between the incidence of early and advanced stages.
Abstract: A regression of tumour growth is observed when alkoxyglycerols are administered prior to radiation treatment of patients suffering from cancer of the uterine cervix. This regression has been demonstrated by a change in the quotient between the incidence of early and advanced stages.

37 citations


Authors
Network Information
Related Institutions (5)
Russian Academy of Sciences
417.5K papers, 4.5M citations

74% related

Saint Petersburg State University
53.4K papers, 1.1M citations

71% related

Moscow State University
123.3K papers, 1.7M citations

71% related

Saint Petersburg State Polytechnic University
14.1K papers, 149.5K citations

70% related

Moscow Institute of Physics and Technology
16.9K papers, 246.5K citations

69% related

Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20214
20203
201911
20187
20177
20162