50 research outputs found
Laws of the Cosmos
No full textDisclaimer:
The ideas, conceptual structures, and unified framework
presented in this paper are the original work of Ramzy Ibrahim,
developed independently over the past decade.
This hypothesis is philosophical and conceptual in nature and
does not contain formal mathematical proofs.
It is shared here for open scientific, philosophical,
and metaphysical discussion.
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Abstract:
This work presents a conceptual model that aims to bridge
the gap between quantum mechanics and general relativity
by proposing time as the primary structure upon which
everything else is built. It explores how mass generates
"layered gravitational zones" and how time precedes and
encloses space. It also considers how quantum particles like
photons and electrons may be projections of deeper,
higher-dimensional structures.
This framework invites further investigation and reflection
on the fundamental architecture of the cosmos.
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Author: Ramzy Ibrahim
Email: [email protected]
A model of inclusion and inclusive leadership in the U.S.
No full textChanging demographics as more women and minorities join the workforce prompted changes in how organizations address and deal with diversity. Practitioners and researchers continue to debate the most effective methods of dealing with these changes on all levels, from the macro social consequences to the micro, such as the very definition of the term “inclusion” itself. This study proposed a model where servant leadership functioned as an inclusive leadership style that has a positive relationship with inclusion. Inclusion was hypothesized as a composite comprised of employee perceptions of uniqueness and belongingness within a workgroup. Consequently, inclusion was hypothesized to be positively related to both creativity and team citizenship behaviors. Utilizing structural equation modeling, the aim of this study was to test said model of inclusion from the perspective of employees.Ph. D.Includes bibliographical referencesby Elizabeth Ramzy Sali
Suppression of superconductivity and resistivity anomaly in Rh17S15 by cobalt substitution
No full textInternational audienceThe chalcogenide superconductor Rh17S15 is known for having an upper critical field of nearly twice the Pauli limit and an unusual temperature dependence of the resistivity. When doped with small amounts of cobalt, superconductivity in Rh17-xCoxS15 (0 < x < 3) is systematically suppressed. We explore the evolution of the electrical transport properties from 2-300 K as a function of x. We identify three temperature regimes which are differently affected by doping. The disappearance of an electron-like contribution to the transport at low temperature is correlated with the suppression of superconductivity
Investigation of Combined Electronic and Ionic Thermoelectric Concrete
No full textFunding Information: Acknowledgment. The authors would like to thank the civil engineering laboratory staff. In addition, the authors would like to thank Ramzy Abdelaziz and Ville Liljeström from NanoMicroscopy Center (NMC) for using the SEM and XRD equipment. The funding from Academy of Finland Postdoctoral fellowship (348611) and Auramo-säätiö is highly appreciated. Funding Information: The authors would like to thank the civil engineering laboratory staff. In addition, the authors would like to thank Ramzy Abdelaziz and Ville Liljeström from NanoMicroscopy Center (NMC) for using the SEM and XRD equipment. The funding from Academy of Finland Postdoctoral fellowship (348611) and Auramo-säätiö is highly appreciated. Publisher Copyright: © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.Thermoelectric energy is one of the promising renewable energy technologies. Research has been focused on finding new materials that have higher efficiency. While most research focuses on electronic thermoelectric materials based on solid materials, recent research also started to head towards ionic thermoelectricity utilizing the ionic conductivity of liquids and gels. Recently, more materials with p-types thermoelectric properties have been developed than n-type. More n-type thermoelectric materials are needed to be developed to produce more energy from thermoelectric modules. This paper aims to (1) illustrate the concept of combining electronic and ionic thermoelectric material properties, (2) develop an n-type thermoelectric generator using MnO2 nanopowders and cement paste which acts as a core of the sample, (3) present a novel way to compensate the strength loss through casting high strength concrete shell around the thermoelectric core. Finally, a parametric study is carried out to investigate the role of KOH, MnO2, inner core size, and the effect of temperature gradient on ionic conductivity.Peer reviewe
Unconventional aspects of electronic transport in delafossite oxides
No full textThe electronic transport properties of the delafossite oxides are usually understood in terms of two well-separated entities, namely the triangular and ( layers. Here, we review several cases among this extensive family of materials where the transport depends on the interlayer coupling and displays unconventional properties. We review the doped thermoelectrics based on and , which show a high-temperature recovery of Fermi-liquid transport exponents, as well as the highly anisotropic metals , , and , where the sheer simplicity of the Fermi surface leads to unconventional transport. We present some of the theoretical tools that have been used to investigate these transport properties and review what can and cannot be learned from the extensive set of electronic structure calculations that have been performed
A straightforward 2 omega technique for the measurement of the Thomson effect
No full textWe present a simplified, rapid, and accurate method for the measurement of the thermoelectric Thomson coefficient by the dynamical heating of a suspended wire by an alternating current. By applying a temperature gradient across the wire, we find that the response at the second harmonic of the excitation frequency is directly proportional to the Thomson coefficient. The absolute thermoelectric coefficient of a single material can therefore be extracted with high precision by using a phase sensitive detector. We test our method on platinum and nickel wires and develop both analytical and numerical models to determine the leading sources of error
Thermoelectric properties beyond the standard Boltzmann model in oxides: A focus on the ruthenates
No full textDecision Factors for E-Waste in Northen Mexico: To Waste or Trade
No full textabstract: Electronic waste (E-waste) is a concern, because of the increasing volume of materials being disposed of. There are economical, social and environmental implications derived from these materials. For example, the international trade of used computers creates jobs, but the recovery from valuable materials is technically challenging and currently there are environmental and health problems derived from inappropriate recycling practices. Forecasting the flows of used computers and e-waste materials supports the prevention of environmental impacts. However, the nature of these material flows is complex. There are technological geographical and cultural factors that affect how users purchase, store or dispose of their equipment. The result of these dynamics is a change in the composition and volume of these flows. Collectors are affected by these factors and the presence of markets, labor and transportation costs. In northern Mexico, there is an international flow of new and used computers between Mexico and the United States and an internal flow of materials and products among Mexican cities. In order to understand the behavior of these flows a field study was carried out in 8 different Mexican cities. Stake holders were interviewed and through a structured analysis the system and the relevant stakeholders were expressed as Data Flow Diagrams in order; to understand the critical parts from the system. The results show that Mexican cities have important qualitative differences. For example, location and size define the availability of resources to manage e-waste. Decisions to dispose a computer depend on international factors such as the price of new computers, but also on regional factors such as the cost to repair them. Decisions to store a computer depend on external factors such as markets, but also internal factors such as how users perceive the value of old equipment. E-waste collection depends on the value of e-waste, but also on costs to collect and extract value from them. The main implication is that a general policy base on how E-waste is managed at a big city might not be the most efficient for a small one. More over combining strengths from different cities might overcome respective weaknesses and create new opportunities; this integration can be stimulated by designing policies that consider diversityDissertation/ThesisM.S. Civil and Environmental Engineering 201
Hadiths Classification Using a Novel Author-Based Hadith Classification Dataset (ABCD)
No full textReligious studies are a rich land for Natural Language Processing (NLP). The reason is that all religions have their instructions as written texts. In this paper, we apply NLP to Islamic Hadiths, which are the written traditions, sayings, actions, approvals, and discussions of the Prophet Muhammad, his companions, or his followers. A Hadith is composed of two parts: the chain of narrators (Sanad) and the content of the Hadith (Matn). A Hadith is transmitted from its author to a Hadith book author using a chain of narrators. The problem we solve focuses on the classification of Hadiths based on their origin of narration. This is important for several reasons. First, it helps determine the authenticity and reliability of the Hadiths. Second, it helps trace the chain of narration and identify the narrators involved in transmitting Hadiths. Finally, it helps understand the historical and cultural contexts in which Hadiths were transmitted, and the different levels of authority attributed to the narrators. To the best of our knowledge, and based on our literature review, this problem is not solved before using machine/deep learning approaches. To solve this classification problem, we created a novel Author-Based Hadith Classification Dataset (ABCD) collected from classical Hadiths’ books. The ABCD size is 29 K Hadiths and it contains unique 18 K narrators, with all their information. We applied machine learning (ML), and deep learning (DL) approaches. ML was applied on Sanad and Matn separately; then, we did the same with DL. The results revealed that ML performs better than DL using the Matn input data, with a 77% F1-score. DL performed better than ML using the Sanad input data, with a 92% F1-score. We used precision and recall alongside the F1-score; details of the results are explained at the end of the paper. We claim that the ABCD and the reported results will motivate the community to work in this new area. Our dataset and results will represent a baseline for further research on the same problem
PENERAPAN METODE RELIABILITY CENTERED MAINTENANCE (RCM) PADA PERENCANAAN PERAWATAN SISTEM PROPULSI KRDE BIAS DI PT INKA (PERSERO)
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Dipublikasikan tanggal: 12 November 2023  
