Rehabilitation of concrete structure using composite materials

In the United Arab Emirates, most of the concrete structures including road, infrastructure and different types of buildings have been reported to be in need of rehabilitation. It is universally acknowledged that the environment of the countries in the Arabian Gulf is extremely severe and very aggressive to construction materials and operations. It is anticipated that the cost of rehabilitation of civil infrastructure will gradually increase over the next decade as a direct consequence of the increase in the number of structures reaching their expected service life. Accordingly demand on rehabilitation methods will increase. In addition the severe climatic conditions of the country will require additional features for this method such as excellent exposure to high temperature fluctuation, moisture and UV contents. The main reasons of reinforced concrete structure\u27s deterioration are corrosion of the steel bars (because of high temperature and humidity of the UAE environment) or continual upgrading of service loads (increase of the traffic load on bridges for example). The solution to these problems is to either re-build the structure or repair the concrete. One of the promising solutions to this problem is to use fiber reinforced concrete (FRC) as replacement for the old methods of repair. The advantages of FRP are lightweight, high tensile strength, corrosion resistance, flexibility and electromagnetic resistance. The object cue of this thesis to, investigate the use of FRP as a strengthening method of concrete structures and its long-term performance, especially in the severe climatic conditions prevailing in the Arab Gulf region

The Nature of the Relationships between Social Networks, Interpersonal Trust, Management Support, and Knowledge Sharing

Purpose – Past research has shown that, by implementing knowledge sharing, an organisation can maintain its long-term competitive advantage. Hence, this research will explore the nature of the relationships between social networks, interpersonal trust, management support, and knowledge sharing. Methodology/approach – In order to achieve the above purpose, semi-structured interviews were used to gather qualitative data. Interviewee participants included top and middle managers and frontline employees. The total number of participants included in the research was 25, equally representing five companies. The core business of all the companies was large-scale manufacturing. A grounded theory approach was used to analyse the data, augmented by the computer-assisted qualitative data analysis software, Nvivo. Findings – The results reveal that social networks facilitate knowledge sharing in diverse ways. These ways are: the use of multiple communication styles, brainstorming and problem solving, learning and teaching, training, employee rotation, and consultation. In addition, the data from the interviews suggests that, through various factors, the level of interpersonal trust, influences the extent to which employees are willing to share knowledge. These factors are organisational, relational, and individual factors. Furthermore, this study shows that both middle and top managers can play significant roles in facilitating knowledge sharing between employees. These roles are: encouragement of participation in decision-making, provision of recognition, breaking down of barriers, building up of teams, providing training or assigning others to do training, encouragement of training, communication, learning, putting knowledge into practice in the form of processes, and movement of employees. Research contributions – Six models were developed from the qualitative analysis of the field data. The brainstorming and problem solving model identifies various steps for brainstorming and problem solving which influence social networks and knowledge sharing. The model of learning and teaching explains how social networks can be built based on the receivers’ levels of knowledge, namely, the novice, competent, expert, and proficient levels. The model of factors influencing social networks and knowledge sharing illustrates various factors. These are: using multiple communication strategies, brainstorming and problem solving, learning and teaching, training, employee rotation, and consultation. The model of factors influencing interpersonal trust describes three factors for achieving such trust: organisational, relational, and individual factors. This model also elaborates on three factors that negatively influence interpersonal trust. These are division between departments, team conflict, and a sense of vulnerability. The model of the role of management teams in encouraging participation in decision-making elaborates on levels of decision-making among employees and the way in which knowledge flows between top and middle management and frontline employees. The integrative model deciphers the relationships between social networks, interpersonal trust, management support, openness, and knowledge sharing. In addition, the relationships between each area of emphasis and knowledge sharing are included in the model. Based on this model, a survey questionnaire was developed. These models provide new insights into the relationships between social networks, interpersonal trust, management support, and knowledge sharing. By applying these models to appropriate field situations, both practitioners and academics may be able to improve current practices relating to how knowledge is shared and evolves within organisations

Ignorance in the Unleashed Company and the Speculation

This research will look at the ignorance in Al-anan and speculation companies. It will also discuss the definition of each and answer the main research issue، which is identifying the influence of both companies، using descriptive analytical approach. The research concluded a set of Results: ignorance with its two types; the minor and major، enters both companies. The minor ignorance is forgiven while the major one، which causes conflict and discord، terminates the contrac

The impact of the 2021 cyclone Shaheen on the mental health of affected Omanis

Objectives: Nine strong cyclones have been recorded in Oman in the last 50 years, the last being tropical cyclone Shaheen in October 2021, in the northern Oman area. The aim of our study was to determine the relationship between property loss and the mental health of residents after cyclone Shaheen. Methods: We conducted a cross-sectional study among Omani citizens living in areas affected by cyclone Shaheen three to six months post-cyclone. In an online, self-reported questionnaire, we assessed the loss of participants’ properties due to the cyclone and the impact on their perceived mental health. Descriptive statistics, chi-square tests, and associations between demographics, loss of properties, and mental health were performed. Results: Of 440 participants, 79.3% had their houses directly damaged by the cyclone and 90.7% had their outside properties damaged. Most of the respondents reported that they suffered from mental health symptoms in the months following the cyclone. Women, people with a lower socioeconomic status, the unemployed, and those without a university degree were associated with poorer mental health outcomes. Mental health was significantly lower for respondents whose properties were mostly affected by the cyclone. Conclusions: With scant knowledge about how cyclones directly affect Omanis’ mental health, the results of this study are paramount for the planning of psychological care services to improve the country’s response to extreme weather events.</p

Deterministic seismic hazard assessment for Sultanate of Oman

The Sultanate of Oman forms the southeastern part of the Arabian plate, which is surrounded by relatively high active tectonic zones. Studies of seismic risk assessment in Oman have been an important on-going socioeconomic concern. Using the results of the seismic hazard assessment to improve building design and construction is an effective way to reduce the seismic risk. In the current study, seismic hazard assessment for the Sultanate of Oman is performed through the deterministic approach with particular attention on the uncertainty analysis applying a recently developed method. The input data set contains a defined seismotectonic model consisting of 26 seismic zones, maximum magnitudes, and 6 alternative ground motion prediction equations that were used in four different tectonic environments: obduction zone earthquake (Zagros fold thrust belt), subduction zone earthquakes (Makran subduction zones), normal and strike-slip transform earthquakes (Owen and Gulf of Aden zones), and stable craton seismicity (Arabian stable craton). This input data set yielded a total of 76 scenarios at each point of interest. A 10 % probability that any of the 76 scenarios may exceed the largest median ground acceleration is selected. The deterministic seismic hazards in terms of PGA, 5 % damped spectral acceleration at 0.1, 0.2, 1.0 and 2.0 s are performed at 254 selected points. The ground motion was calculated at the 50th and 84th percentile levels for selected probability of exceeding the median value. The largest ground motion in the Sultanate of Oman is observed in the northeastern part of the country.Oman Ministerial Cabinet (Project 22409017

Probabilistic seismic hazard maps for the sultanate of Oman

This study presents the results of the first probabilistic seismic hazard assessment (PSHA) in the framework of logic tree for Oman. The earthquake catalogue was homogenized, declustered, and used to define seismotectonic source model that characterizes the seismicity of Oman. Two seismic source models were used in the current study; the first consists of 26 seismic source zones, while the second is expressing the alternative view that seismicity is uniform along the entire Makran and Zagros zones. The recurrence parameters for all the seismogenic zones were determined using the doubly bounded exponential distribution except the zones of Makran, which were modelled using the characteristic distribution. Maximum earthquakes were determined and the horizontal ground accelerations in terms of geometric mean were calculated using ground-motion prediction relationships developed based upon seismic data obtained from active tectonic environments similar to those surrounding Oman. The alternative seismotectonic source models, maximum magnitude, and ground-motion prediction relationships were weighted and used to account for the epistemic uncertainty. Hazard maps at rock sites were produced for 5 % damped spectral acceleration (SA) values at 0.1, 0.2, 0.3, 1.0 and 2.0 s spectral periods as well as peak ground acceleration (PGA) for return periods of 475 and 2,475 years. The highest hazard is found in Khasab City with maximum SA at 0.2 s spectral period reaching 243 and 397 cm/s[superscript 2] for return periods 475 and 2,475 years, respectively. The sensitivity analysis reveals that the choice of seismic source model and the ground-motion prediction equation influences the results most.Oman Ministerial Cabinet (project number 22409017

The Oman Animal and Plant Genetic Resources Center’s (OAPGRC) Science Café: A Success Story”

Science Cafés are held in many towns and cities across the world for the promotion of scientific culture and the understanding of our daily lives, which we live in. They provide a platform for interaction and dialogue between scientists, researchers, businesses and the community on trends towards current scientific issues the extent of their impact on culture and society. The Oman Animal and Plant Genetic Resources Center (OAPGRC) Science Cafe is a forum for the discussion of important and interesting scientific topics and issues. Since May 2013 to December 2015, OAPGRC has held a series of science café sessions on topics related to biodiversity, food security, climate change, pollution and sustainable use. The OAPGRC science café is the first in Oman to be put on the international map of scientific cafes around the world.  Reviewing the data on the outcomes and performance of these sessions indicates that the session attendance and active participation was 51% by men and 49% women. This is an exceptional case where the interest is almost equal between the genders. As for the age group, the highest percentage 49% was of a class of young people aged between 18-25 years. Followed by the age group (26-35 years) which was 30%. The lowest percentage was 21% for the age group of above 35 years. The experience of the science café in Oman has been proved as a major success for both the scientific and social aspects. Therefore there are different plans to maintained and develop it in the near future