52 research outputs found
Performance appraisal and its implementation in the Nepalese civil service
No full textThesis(Master) --KDI School:Master of Public Policy,2010masterpublishedby Ramesh Mainali
ANALYSIS AND MITIGATION OF CONDUCTED EMI IN SWITCHED-MODE POWER SUPPLIES
No full textPh.DDOCTOR OF PHILOSOPH
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The Rest-Frame Ultraviolet Spectra of Galaxies in the Reionization-Era
No full textRecent studies have revealed detections of UV metal emission lines (CIII], OIII], CIV) in three of the first galaxies observed at z>6,
providing the first spectroscopic insight into the nature of early star forming galaxies. The equivalent widths (EWs) of these lines are more than an order of magnitude stronger than what is typical at lower redshifts, potentially indicating significant differences in the ionizing spectrum of galaxies in the reionization era. The origin of the high ionization lines remains unclear, likely requiring either a low metallicity stellar population or AGN. However owing to the limited number of z>6 sources with deep spectroscopy and limited number of analogs at lower redshifts, it has proven difficult to generalize and interpret the initial results. In the first part of my thesis, I have undertaken a comprehensive Keck, LBT and VLT spectroscopic campaign to characterize the EW distribution of UV metal lines at z>6. My results present new constraints on the fraction of strong CIII] and CIV emitting galaxies at z>6 and indicate that ionizing spectrum from stellar population at z>6 could be significantly harder than systems at a lower redshift. In the second part of my thesis, I have developed a new strategy to identify and characterize analogs of the strong UV metal line emitters at lower redshift. This has resulted in a new sample of extreme CIII] emitters at z~2. Using spectroscopic tools, I have shown that large equivalent width CIII] emission lines tend to be those with moderately low gas-phase oxygen abundance, low stellar metallicity, large ionization parameter, and very little dust extinction. My results will guide surveys with current and future facilities (Spitzer, JWST, WFIRST) providing optimal strategy to target UV metal lines in the reionization epoch
Comparison of the multi-layer multi-configuration time-dependent Hartree (ML-MCTDH) method and the density matrix renormalization group (DMRG) for ground state properties of linear rotor chains
No full textThis article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Mainali, S., Gatti, F., Iouchtchenko, D., Roy, P.-N., & Meyer, H.-D. (2021). Comparison of the multi-layer multi-configuration time-dependent Hartree (ML-MCTDH) method and the density matrix renormalization group (DMRG) for ground state properties of linear rotor chains. The Journal of Chemical Physics, 154(17), 174106. https://doi.org/10.1063/5.0047090 and may be found at https://aip.scitation.org/doi/10.1063/5.0047090We demonstrate the applicability of the Multi-Layer Multi-Configuration Time-Dependent Hartree (ML-MCTDH) method to the problem of computing ground states of one-dimensional chains of linear rotors with dipolar interactions. Specifically, we successfully obtain energies, entanglement entropies, and orientational correlations that are in agreement with the Density Matrix Renormalization Group (DMRG), which has been previously used for this system. We find that the entropies calculated by ML-MCTDH for larger system sizes contain nonmonotonicity, as expected in the vicinity of a second-order quantum phase transition between ordered and disordered rotor states. We observe that this effect remains when all couplings besides nearest-neighbor are omitted from the Hamiltonian, which suggests that it is not sensitive to the rate of decay of the interactions. In contrast to DMRG, which is tailored to the one-dimensional case, ML-MCTDH (as implemented in the Heidelberg MCTDH package) requires more computational time and memory, although the requirements are still within reach of commodity hardware. The numerical convergence and computational demand of two practical implementations of ML-MCTDH and DMRG are presented in detail for various combinations of system parameters.Natural Sciences and Engineering Research Council (NSERC), Grant RGPIN-2016-04403 || Ontario Ministry of Research and Innovation (MRI) || Canada Research Chair program, Grant 950-231024 || Canada Foundation for Innovation (CFI), Grant 35232 || Canada First Research Excellence Fund (CFREF
Design of a current-sense voltage-feedback common mode EMI filter for an off-line power converter
No full text10.1109/PESC.2008.4592174PESC Record - IEEE Annual Power Electronics Specialists Conference1632-1638PRIC
Simple analytical models to predict conducted EMI noise in a power electronic converter
No full text10.1109/IECON.2007.4460236IECON Proceedings (Industrial Electronics Conference)1930-1936IEPR
Mathematics Textbook: Motivation, Experiences, and Didactical Aspect from Authors’ Perspectives
No full textTextbooks play a vital role in the Nepali education system since they are one of the main resources for teaching and learning mathematics. Because of poor physical infrastructure and inadequate educational resources, both teachers and students heavily rely on textbooks. In this regard, this study investigated the mathematics textbook authors\u27 experiences and motivation, and what types of didactical knowledge were utilised while writing textbooks. A convenient yet purposeful sampling method was utilised to select four participants. The data analysis unveiled that each textbook author had different types of motivation and experiences, and only one participant was aware of the ideas of didactical knowledge and utilised them to some extent in textbooks. The writing process was more influenced by the examination, mathematical content, and classroom experiences. As a result, textbooks seemed to be content-heavy and examination-oriented. Additional professional development programmes likely would help authors to produce more effective textbooks in Nepal.
This article was published Open Access through the CCU Libraries Open Access Publishing Fund. The article was first published in Research in Mathematics Education: https://doi.org/10.1080/14794802.2022.208660
Synthesis, characterization, and CO<sub>2</sub> uptake of mellitic triimide-based covalent organic frameworks
No full textNovel Aerospace MaterialsRST/Storage of Electrochemical EnergyDelft Aerospace Structures and Materials Laborator
Author Correction: Guidelines for Neuroprognostication in Adults with Guillain–Barré Syndrome
No full textAuthor Correction to: Guidelines for Neuroprognostication in Adults with Guillain–Barré Syndrom
Effect of heat treatment on microstructure and functional properties of additively manufactured NiTi shape memory alloys
No full textAdditive manufacturing of NiTi shape memory alloys has attracted attention in recent years, due to design flexibility and feasibility to achieve four-dimensional (4D) function response. To obtain customized 4D functional responses in NiTi structures, tailorable phase transformation temperatures and stress windows as well as one-way or two-way shape memory properties are required. To achieve this goal, various heat treatments, including direct aging, annealing and annealing followed by aging, were optimized for the Ti-rich NiTi (Ni49.6Ti (at. %)) fabricated by laser powder bed fusion (L-PBF). Microstructural evolution, phase transformation, precipitation and shape memory behaviour were systematically investigated by multiscale correlative microstructural, differential scanning calorimetry analysis and thermomechanical analysis. Based on optimized heat treatments, ∼25 K phase transformation temperature windows and ∼90 MPa stress windows were achieved for the one-way shape memory effect. Solutionized annealing was found to be the most effective way to improve one-way shape memory degradation resistance, due to the reduction of defects and solid solution strengthening. One of the main findings of this study is that the heterogonous microstructures between hard intergranular Ti2NiOx and soft NiTi matrix, induced by solutionized annealing with subsequent aging, result in strain partitioning and enclosing the internal stress state, which was found to promote a pronounced two-way shape memory effect response. The results of this work provide in-depth knowledge on tailoring and designing functional shape memory characteristics via heat treatments, which contributes to expanding L-PBF NiTi application fields, such as biomedical implants, aerospace components, and other advanced engineering applications.Team Vera PopovichQN/AfdelingsbureauTeam Maria Santofimia NavarroTeam Marcel Herman
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