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Search Results: 1 - 10 of 191498 matches for " D. Muna "
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Information and Communication Technologies 'ICTs' in the Saudi Household
Muna D. Alsuraihi,Heba Omar Bashraheel
Journal of Asian Scientific Research , 2013,
Abstract: This is a study submitted originally to the Information Dept. Committee in Humanities and Arts College, King Abdul Aziz University, in Partial fulfillment of the requirements for the Degree of Masters in the Information Management Program. The goal of this study is to explore the Saudi household use of ICT 'Information and Communication Technology'; one the Saudi household clearly depends on nowadays. Most Saudi households have access to ICTs like mobiles and Internet connections. It is important to analyze to what extent are they used, the goals of their use, and its impact on the households. This paper focuses on five questions related to the ICTs use, awareness and effects as well as investigating the correlation between some households' characteristics and the raised issues. The sample was an accidental sample, and the study questionnaire was built and judged according to the study questions and purposes.
Electrochemical Self-Assembly of Nanoporous Alumina Templates Title  [PDF]
Muna Moussa Abbas
Advances in Materials Physics and Chemistry (AMPC) , 2013, DOI: 10.4236/ampc.2013.35035
Abstract: Porous alumina was fabricated electrochemically through anodic oxidation of aluminum by means of such a self-organized method. Anodic aluminium oxide (AAO) template with nanopores was grown by two-steps anodization processes from a high purity aluminium foil. The anodization process was carried out in a phosphoric acid electrolyte at ambient temperature with a different duration of anodization. The analysis observation by Atomic Force Microscopy (AFM) showed that nanopore size increased with anodization time. The nanopore sizes of porous alumina were (16.04, 26.19 and 37.39 nm) for (1, 2 and 3 hour) respectively.
Experimental Investigation of the Early Stage of Precipitation on Binary Al-Li, Al-Cu Alloys and Ternary Al-Li-Cu Alloys by Means of Atom Probe Tomography  [PDF]
Muna Khushaim, Torben Boll
Open Journal of Metal (OJMetal) , 2016, DOI: 10.4236/ojmetal.2016.62003
Abstract:
Aluminum-based alloys play a key role in modern engineering and are widely used in construction components in aircraft, automobiles and other means of transportation due to their light weight and superior mechanical properties. Introduction of different nano-structure features can improve the service and the physical properties of such alloys. An improvement of an Al-based alloy has been performed based on the understanding of the relationships among compositions, processing, microstructural characteristics and properties. Knowledge of the decomposition process of the microstructure during the precipitation reaction is particularly important for future technical developments. The objective of this study is to investigate the nano-scale chemical composition in the Al-Cu, Al-Li and Al-Li-Cu alloys during the early stage of the precipitation sequence and to describe whether this compositional difference correlates with variations in the observed precipitation kinetics. Investigation of the fine scale segregation effects of dilute solutes in aluminum alloys which were experienced different heat treatments by using atom probe tomography has been achieved. The results show that an Al-1.7 at.% Cu alloy requires a long ageing time of approximately 8 h at 160°C to allow the diffusion of Cu atoms into Al matrix. For the Al-8.2 at.% Li alloy, a combination of both the natural ageing condition (48 h at room temperature) and a short artificial ageing condition (5 min at 160°C) induces increasing on the number density of the Li clusters and hence increase number of precipitated particles. Applying this combination of natural ageing and short artificial ageing conditions onto the ternary Al-4 at.% Li-1.7 at.% Cu alloy induces the formation of a Cu-rich phase. Increasing the Li content in the ternary alloy up to 8 at.% and increasing the ageing time to 30 min resulted in the precipitation processes ending with δ' particles. Thus the results contribute to the understanding of Al-alloy design.
Effect of plant biomass, manure and inorganic fertilizer on maize yield in the central Highlands of Kenya
J Mugwe, D Mugendi, J Kungu, M Mucheru-Muna
African Crop Science Journal , 2007,
Abstract: Soil fertility degradation remains the major biophysical cause of declining per capita crop production on smallholder farms in sub-Saharan Africa. Appropriate soil fertility regimes, are therefore, critical for improved crop productivity. This study investigated the feasibility of using sole organics or their combinations with inorganic fertilisers to improve maize (Zea mays) production in the highlands central Kenya. Sole application of Calliandra calotyrsus, Leucaena trichandra trichandra, Mucuna pruriens, Crotalaria ochroleuca, Tithonia diversifolia and cattle manure at 60 kg N ha-1 or combined application of the organic materials (30 kg N ha-1) plus inorganic fertiliser (30 kg N ha-1) gave significantly (P < 0.05) higher maize grain yields than the recommended rate of inorganic fertiliser (60 kg N ha-1). These treatments maintained maize yields at 4 to 6 t ha-1. Farmers had their own innovations where they combined organic resources and generally appreciable yields (3.0 to 5.6 t ha-1) were obtained from these innovations. However, there was a maize yield gap between on station and on farm trials with on station yields having on average 65% more yields than the on-farm yields. This was mainly attributed to differences in management practices arising from partial adoption of recommended rates. There is need therefore to develop and implement mechanisms tailored to ensure that farmers’ modications recommended soil amendment regimes and other agronomic practices are appropriate for enhanced crop productivity. Further studies are needed to establish the optimum mixture of different organic materials.
Shapes of a liquid droplet in a periodic box
S. Prestipino,C. Caccamo,D. Costa,G. Malescio,G. Munaò
Physics , 2015, DOI: 10.1103/PhysRevE.92.022141
Abstract: Within the coexistence region between liquid and vapor the equilibrium pressure of a simulated fluid exhibits characteristic jumps and plateaus when plotted as a function of density at constant temperature. These features exclusively pertain to a finite-size sample in a periodic box, as they are washed out in the bulk limit. Below the critical density, at each pressure jump the shape of the liquid drop undergoes a morphological transition, changing from spherical to cylindrical to slab-like as the density is increased. We formulate a simple theory of these shape transitions, which is adapted from a calculation originally developed by Binder and coworkers [{\em J. Chem. Phys.} {\bf 120}, 5293 (2004)]. Our focus is on the pressure equation of state (rather than on the chemical potential, as in the original work) and includes an extension to elongated boxes. Predictions based on this theory well agree with extensive Monte Carlo data for the cut-and-shifted Lennard-Jones fluid. We further discuss on the thermodynamic stability of liquid drops with shapes other than the three mentioned above, like those found deep inside the liquid-vapor region in simulations starting from scratch. Our theory classifies these more elaborate shapes as metastable.
A Qualitative Exploration of Help-Seeking Process  [PDF]
Muna Abdullah Al-Bahrani
Advances in Applied Sociology (AASoci) , 2014, DOI: 10.4236/aasoci.2014.47020
Abstract:

Matriculation to college life can often pose adjustment problems that require identification and help. This is especially true in societies where gender separation is the norm. This qualitative study explores the help-seeking process from the subjective and cultural perspective of Omani students. The processes of help-seeking behavior within the Omani cultural framework are explored in terms of recognizing, defining a problem, making decision, and selecting sources of help. A triangulation methodology was used in this study that included two and half months of observation and interaction at Sultan Qaboos University in the office of Deanship of Student Affairs, the Counseling Center, and the Psychiatric Department of the university hospital. Individual and focus-group interviews were conducted. The interviews were, for the most part, extensive dialogues. Statistical documents in regard to students’ academic probation as well as newspaper articles aided in understanding the Omani help-seeking process. The results show that Omani students experience multiple challenges that impact their psychological adjustments. These challenges can be associated with the novelty of academic life and the coeducational culture of the institution. Some freshmen face with new expectations of learning as well as separation from their close ties, and struggle to find a balance between some of their traditional points of reference and the new sets of values to which they are exposed at Sultan Qaboos University. The influence of traditional culture on the dynamics of problem recognition may be expressed by anger and rejection, declining academic achievement, and violation of religious principles. For these students, traditional values and religious practices are seen as key coping mechanisms.

Innovative Culture: An Intervention Strategy for Sustainable Growth in Changing Scenario
Muna Kalyani
International Journal of Business Administration , 2011, DOI: 10.5430/ijba.v2n4p84
Abstract: To-day’s era is very hypercompetitive, a key feature of the new economy in the changing business scenario. The pace of change is increasing at an exponential rate. Continuous change and maintenance of high standards of quality products, services and processes have become prerequisites of the organization’s success in to-day’s competitive world. Organizations can rarely stand still for long. In highly competitive environment, where competition is global and innovation is continuous, change has become a core competency of organizations. Change refers to making things different. Innovation is a more specialized kind of change. All innovation involves change, but not all changes necessarily involve new ideas or lead to significant improvement or radical breakthroughs. Competitive climate requires organizations to institutionalize the process of innovation –to plant the seeds of innovations can utterly transform a scenario, involves the unfreezing-change-refreezing process. Innovation is not a thing that can be purchased or installed like a computer system. Rather it is a culture that must be adopted and nurtured which extracts values from assets old and new, and rejuvenates and revolutionizes industry, society and business. Innovation is an act of changing the established way of doing things, the ability to turn knowledge into value and link emerging technologies with emerging markets and is about bringing creative new ideas to life. The process involves the ways in which norms and values are set and practiced, holds innovative driven culture. This innovative culture can give competitive advantage; provided it is deeply rooted in the functional aspects of the organizations’ culture, where the productive potential of people’ knowledge and actions are guided and governed by the spirit and principles of OCTAPACE and innovative cultures. These cultures get into hyper drive mode to keep growth engine humming. The article examines this context and argues that organizations can use innovative culture as a strategic intervention for managing change for survival and growth.
Simulations of the Nuclear Recoil Head-Tail Signature in Gases Relevant to Directional Dark Matter Searches
P. Majewski,D. Muna,D. P. Snowden-Ifft,N. J. C. Spooner
Physics , 2009, DOI: 10.1016/j.astropartphys.2010.08.007
Abstract: We present the first detailed simulations of the head-tail effect relevant to directional Dark Matter searches. Investigations of the location of the majority of the ionization charge as being either at the beginning half (tail) or at the end half (head) of the nuclear recoil track were performed for carbon and sulphur recoils in 40 Torr negative ion carbon disulfide and for fluorine recoils in 100 Torr carbon tetrafluoride. The SRIM simulation program was used, together with a purpose-written Monte Carlo generator, to model production of ionizing pairs, diffusion and basic readout geometries relevant to potential real detector scenarios, such as under development for the DRIFT experiment. The results clearly indicate the existence of a head-tail track asymmetry but with a magnitude critically influenced by two competing factors: the nature of the stopping power and details of the range straggling. The former tends to result in the tail being greater than the head and the latter the reverse.
Exergy Efficiency and Environmental Impact of Electricity of a 620 MW-Natural Gas Combined Cycle  [PDF]
Muna Hamad Almansoori, Zin Eddine Dadach
Journal of Power and Energy Engineering (JPEE) , 2018, DOI: 10.4236/jpee.2018.67001
Abstract: In the first part of this investigation, a Natural Gas Combined Cycle (NGCC) producing 620 MW of electricity was simulated using the commercial software Aspen Hysys V9.0 and the Soave-Redlich-Kwong (SRK) equation of state. The aim of this second part is to use exergy-based analyses in order to calculate its exergy efficiency and evaluate its environmental impact under standard conditions. For the exergy efficiency, the performance index under investigation is the exergy destruction ratio (yD). The results of the study show that the combustor is the main contributor to the total exergy destruction of the power plant (yD = 24.35%) and has the lowest exergy efficiency of 75.65%. On the other hand, the Heat Recovery Steam Generator (HRSG) has the lowest contribution to the exergy destruction (yD = 5.63%) of the power plant and the highest exergy efficiency of 94.37%. For the overall power plant, the exergy efficiency is equal to 53.28%. For the environmental impact of the power plant, the relative difference of exergy-related environmental impacts (rb) is utilized as the performance index for each equipment of the plant and the environmental impact of a kWh of electricity (EIE) is used to represent the performance index of the overall power plant. In agreement with the exergy analysis, the results indicate that the combustor and the HRSG have respectively the highest (rb = 32.19%) and the lowest (rb = 5.96%) contribution to the environmental impact. The environmental impact of a kWh of electricity of the power plant is 34.26 mPts/kWh (exergy destruction only), and 34.42 mPts/kWh (both exergy destruction and exergy loss).
Empathy Levels of Dentistry Students in Peru and Argentina  [PDF]
Víctor Patricio Díaz-Narváez, Fredy Gutierrez-Ventura, Teresa Varela de Villalba, Mercedes Salcedo-Rioja, Aracelis Calzadilla-Nú?ez, Muna Hamdan-Rodríguez, Marcos Cervantes
Health (Health) , 2015, DOI: 10.4236/health.2015.710141
Abstract: Objectives: To compare the empathy of students in two faculties of Dentistry in Peru and Argentina, three factors were considered: universities, academic year and gender. Material and Methods: Empathy matrices in Dentistry students were measured using the Jefferson Scale of Empathy, culturally validated in Peru and Argentina. Empathy data were compared among and within the faculties tested using a three-factor analysis of variance (model III), a Duncan test, and a discriminant analysis. The level of significance used was less than 0.05. Results: We found that differences existed between the students tested. The comparison between the levels of empathy in the studied factors and the presence of unexplained variance showed that empathy was able to differentiate populations. Conclusions: The results indicate variability in the empathy values associated with the factors studied. The discriminant test confirms the differences between faculties revealed by the data matrix resulting from the JSE. These differences are possibly due to the effect of educational and social factors.
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