| 1. |
- Abbafati, Cristiana, et al.
(författare)
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- 2020
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Tidskriftsartikel (refereegranskat)
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| 2. |
- Ademuyiwa, Adesoji O., et al.
(författare)
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Determinants of morbidity and mortality following emergency abdominal surgery in children in low-income and middle-income countries
- 2016
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Ingår i: BMJ Global Health. - : BMJ Publishing Group Ltd. - 2059-7908. ; 1:4
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Tidskriftsartikel (refereegranskat)abstract
- Background: Child health is a key priority on the global health agenda, yet the provision of essential and emergency surgery in children is patchy in resource-poor regions. This study was aimed to determine the mortality risk for emergency abdominal paediatric surgery in low-income countries globally.Methods: Multicentre, international, prospective, cohort study. Self-selected surgical units performing emergency abdominal surgery submitted prespecified data for consecutive children aged <16 years during a 2-week period between July and December 2014. The United Nation's Human Development Index (HDI) was used to stratify countries. The main outcome measure was 30-day postoperative mortality, analysed by multilevel logistic regression.Results: This study included 1409 patients from 253 centres in 43 countries; 282 children were under 2 years of age. Among them, 265 (18.8%) were from low-HDI, 450 (31.9%) from middle-HDI and 694 (49.3%) from high-HDI countries. The most common operations performed were appendectomy, small bowel resection, pyloromyotomy and correction of intussusception. After adjustment for patient and hospital risk factors, child mortality at 30 days was significantly higher in low-HDI (adjusted OR 7.14 (95% CI 2.52 to 20.23), p<0.001) and middle-HDI (4.42 (1.44 to 13.56), p=0.009) countries compared with high-HDI countries, translating to 40 excess deaths per 1000 procedures performed.Conclusions: Adjusted mortality in children following emergency abdominal surgery may be as high as 7 times greater in low-HDI and middle-HDI countries compared with high-HDI countries. Effective provision of emergency essential surgery should be a key priority for global child health agendas.
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| 3. |
- Allard, Ingrid, et al.
(författare)
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Methods for energy analysis of residential buildings in Nordic countries
- 2013
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Ingår i: Renewable & sustainable energy reviews. - : Pergamon-Elsevier Science. - 1364-0321 .- 1879-0690. ; 22, s. 306-318
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Forskningsöversikt (refereegranskat)abstract
- To meet the goals of the directive 2010/31/EU on the energy performance of buildings, the building sector in Europe now faces a transition towards more energy efficient buildings. Research and development of new energy solutions and technology will be necessary for the transition and the importance of analyzing building energy performance increases. This paper aims to review and evaluate different methods that are commonly used to analyze energy performance in residential buildings in Nordic countries, primarily in Sweden, Norway and Finland. A short international review of regulations is also included. The goal is to find commonly used methods and possibilities for the future. The introduced methods are summarized, categorized and compared based on their advantages and disadvantages. Although the three Nordic countries have similar climate conditions and building traditions, the review shows relatively large variations in the definitions of energy performance for residential buildings, as well as variations in how measurements and calculations are used in the methods for energy performance analysis. In the conducted review, methods, or parts of methods, are also found to be used. The methods used to analyze energy performance are found to be more similar than the concepts of energy performance itself in the three countries. These aspects may be considered in further work to develop an international policy practice for energy performance of residential buildings in cold climate.
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| 4. |
- Grundberg, Staffan, et al.
(författare)
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Dynamics of axially loaded and partially interacting composite beams
- 2012
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Ingår i: Proceedings of the 15th European Conference on Composite Materials, Venice, 24-28 June 2012. - Venice. - 9788888785332
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Konferensbidrag (refereegranskat)abstract
- The aim of this paper is to study the dynamics of partially interacting composite beams subjected to axial loads. The eigenfrequencies are derived for the simply supported composite beam subjected to an axial force. Measurements of the fundamental frequencies of a simply supported composite beam consisting of three layers connected by shear connectors are carried out considering different values of the applied axial force. The agreement between the theoretical and experimental results is discussed. It is also shown that the application of the axial force introduces frictional moments at the boundaries, which make the experimental boundary conditions deviate somewhat from those of an ideal simply supported beam.
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| 5. |
- Grundberg, Staffan, et al.
(författare)
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Vibration of axially loaded and partially interacting composite beams
- 2014
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Ingår i: International Journal of Structural Stability and Dynamics. - Singapore : World Scientific. - 0219-4554 .- 1793-6764. ; 14:1, s. 1350047-
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Tidskriftsartikel (refereegranskat)abstract
- The vibrations of axially loaded composite beams with partial interaction are considered. The equations of motion and the pertaining boundary conditions are derived from Hamilton's principle. Mainly free — but also forced — vibrations are considered. The natural frequencies are calculated as a function of the axial force and the stiffness of the interaction between the layers. The analytical result obtained for the eigenfrequencies of the simply supported beam is taken as a starting point for an approximation of the eigenfrequencies of beams subject to other boundary conditions. The proposed approximation — which has no numerical fitting parameters — is shown to be in good agreement with the exact solutions, especially for the case of a beam clamped at both ends.
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| 6. |
- Hassan, Osama A. B.
(författare)
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Application of value - focused thinking on the environmental selection of wall structures
- 2004
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Ingår i: Journal of Environmental Management. - : Elsevier BV. - 0301-4797 .- 1095-8630. ; 70:2, s. 181-187
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Tidskriftsartikel (refereegranskat)abstract
- The decision of selecting building structures with respect to the environmental demand is an issue commonly addressed in environmental management. In this paper, the importance of considering the decision analysis technique value-focused thinking in the environmental selection of wall structures is investigated. In this context, a qualitative value model is developed in which the external and internal environmental factors are considered. The model is applied on a case study in which a decision should be made on three categories of exterior wall structures: wood, masonry and concrete. It is found that the wall structure made of wood is the most compatible option with respect to the external and internal environmental requirements of building structures.
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| 7. |
- Hassan, Osama A.B., et al.
(författare)
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Dynamics of partially interacting composite beams
- 2012
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Ingår i: Proceedings of the 15th European Conference on Composite Materials, Venice, 24-28 June 2012. - Venice. - 9788888785332
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Konferensbidrag (refereegranskat)abstract
- The dynamic behaviour of layered composite beams with partial interaction is analysed using variational calculus. The theoretical results are compared with those from dynamic tests on simply supported beams with varying shear connection stiffness between the layers. The influence of the shear connection stiffness on the flexural natural frequencies, flexural deflection and damping is investigated. A good agreement between the analytical and experimental results is obtained
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| 8. |
- Hassan, Osama. A.B. 1969-
(författare)
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Dyslexia and learning in view of the socio-cultural theory and development psychology
- 2023
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Ingår i: Social Science & Humanities Open. - Amsterdam : Elsevier. - 2590-2911. ; 8:1, s. 100718-100718
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Tidskriftsartikel (refereegranskat)abstract
- This study attempts to apply the socio-cultural learning theory together with the developmental psychology theory to create a better insight into how learning and teaching methods can be made more efficient for university students who have reading and writing difficulties/dyslexia. Pedagogical and didactic methods are derived, based on the sociocultural perspective, Bronfenbrenner's ecological system theory and the author's observations as a teacher in the classroom to help minimize the problem of learning for students with dyslexia. Learning and the learning environment as dictated by these theories can enable the production of pedagogical and didactic methods to streamline the learning of students with dyslexia within the framework of university education.
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| 9. |
- Hassan, Osama A.B. 1969-
(författare)
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Effect of foundation designs of passive house on the thermal bridges at the ground
- 2016
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Ingår i: Journal of Engineering, Design and Technology. - : Emerald Group Publishing Limited. - 1726-0531 .- 1758-8901. ; 14:4, s. 602-613
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Tidskriftsartikel (refereegranskat)abstract
- In this paper it is attempted to study the effect of different foundation designs of passive house on the resultant thermal bridges, at the junction between a wall and a slab on grade. The linear thermal transmittances of some newly developed foundations of passive house are determined. The compared foundation designs are L-element, U-element and foundation with foam glass technique. It is found that the special design of passive house foundation can considerably influence the heat flow through thermal bridges. The calculated linear thermaltransmittances of L-element, U- element and foundation with foam glass are 0.085 W/mK, 0.074 W/mK and 0.031 W/mK, respectively. In this context, it is proposed a new foundation design of passive house, which has relatively low heat loss through thermal bridges, calculated as 0.031 W/mK. The results are compared with the “default” ISO values used to evaluate the effect of thermal bridges in typical buildings. It is found that there is large difference between the calculated linear thermal transmittances at the investigated foundationsof passive house as compared to typical buildings.
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| 10. |
- Hassan, Osama A. B.
(författare)
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Isolation of buildings from ground-borne noise using a sand stratum
- 2004
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Ingår i: Building Acoustics. - : SAGE Publications. - 1351-010X .- 2059-8025. ; 11:2, s. 97-114
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Tidskriftsartikel (refereegranskat)abstract
- The effect of an elastic stratum in reducing ground-borne sound transmission in buildings to be built above railway tunnels is investigated, by considering a sand layer between the bedrock and load bearing elements of the building. It is assumed that the initial vibrational energy that propagates from the foundation is in the form of quasi-longitudinal waves. The complete model as presented by the author in a previous paper is considered. Calculated results are compared with previous results for a typical building and it is shown that a sand layer can considerably reduce upward sound transmission in the building. The results of a parametric study to investigate the influence of the type of load-bearing elements and the thickness of the layer, on transmission of structure-borne sound in the building, are presented.
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