Relevant bibliographies by topics / MtProC

Academic literature on the topic 'MtProC'

Author: Grafiati
Published: 6 September 2023

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Journal articles on the topic "MtProC"

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Zhao, Jian-Hong, Jiang-Huai Chen, Yong Wang, Zhi-Ping Wang, and Yong-Xing He. "The putative compatible solute-binding protein ProX fromMycobacterium tuberculosisH37Rv: biochemical characterization and crystallographic data." Acta Crystallographica Section F Structural Biology Communications 74, no. 4 (March 23, 2018): 231–35. http://dx.doi.org/10.1107/s2053230x18003771.

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InMycobacterium tuberculosis, theproXgene encodes a putative compatible solute-binding protein (MtProX). However, it was found through sequence alignment that the MtProX protein has very different ligand-binding residues compared with other compatible solute-binding proteins, implying that MtProX may bind to ligands that are as yet uncharacterized. In this work, it was demonstrated that MtProX binds to polyphenols such as phloretin, monoacetylphloroglucinol and 2,4-dihydroxyacetophloroglucinol with dissociation constants between 20 and 70 µM. Crystals of MtProX were obtained using a precipitant consisting of 0.2 MNaCl, 0.1 MTris pH 8.5, 25%(w/v) polyethylene glycol 3350. The crystals diffracted to 2.10 Å resolution and belonged to space groupP43212, with unit-cell parametersa=b= 90.17,c= 161.92 Å, α = β = γ = 90.0°. Assuming the presence of two MtProX molecules in the asymmetric unit, the Matthews coefficient was calculated to be 2.74 Å3 Da−1, which corresponds to a solvent content of 55%.
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Zhang, Yifei, Longzhi Zhao, Tianming Zhao, Lu Liu, and Lijun Xu. "Aeroacoustics Analysis of Propeller Blades." Journal of Physics: Conference Series 2569, no. 1 (August 1, 2023): 012026. http://dx.doi.org/10.1088/1742-6596/2569/1/012026.

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Abstract Under rapid development, drone propellers are facing two essential problems: noise emission and aerodynamic efficiency. In this work, the aeroacoustics characteristics of two propellers were experimentally and numerically investigated. Both propellers have exactly the same design points, and MTprop-1678 has a thinner blade and larger chord than MTprop-1688. Results showed that the broadband noise of 1678 significantly rose due to a larger Reynolds number, and the total noise was larger. The study shows that reducing the Reynolds number might be a good idea for propellers’ noise reduction.
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Wu, Hongyan, Xinying Ao, Jianan Liu, Junya Zhu, Jingran Bi, Hongman Hou, Hongshun Hao, and Gongliang Zhang. "Functional Chitosan-Based Composite Film Incorporated with 3-(Methylthio) Propyl Isothiocyanate/α-Cyclodextrin Inclusion Complex for Chicken Meat Preservation." Polymers 14, no. 21 (November 1, 2022): 4655. http://dx.doi.org/10.3390/polym14214655.

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The 3-(Methylthio) propyl isothiocyanate (MTPITC)-loaded inclusion complex prepared by α-cyclodextrin (α-CD) was incorporated into chitosan (CS) film to fabricate a packaging material for fresh chicken meat preservation. Scanning electron microscope images indicated homogenous dispersion of the MTPITC-α-CD in CS polymer. Fourier-transform infrared and X-ray diffraction techniques revealed that MTPITC-α-CD was incorporated into the CS film matrix by the physical interactions. The introduction of MTPITC-α-CD improved the UV-vis light-blocking ability, with a slight loss of transparency. Although the water solubility and water vapor barrier capacity were not significantly influenced by the addition of MTPITC-α-CD, the antioxidant attribute was significantly enhanced. The CS-MTPITC-α-CD film displayed obvious and sustained suppressive effects against Salmonella typhimurium, with the inhibition zone diameters of 14.7 mm at 12 h and 7.3 mm at 24 h, respectively. Moreover, the quality index analysis indicated that the CS-MTPITC-α-CD film-wrapped fresh chicken, during refrigerated storage, exhibited better preservative efficacy than the control groups, with the total viable counts of 6.5 Log CFU/g, total volatile base nitrogen of 8.4 mg/100 g, pH of 6.6, thiobarbituric acid-reactive substances of 0.2 mg/kg, and the sensory score of 5 at day 16. Collectively, these results suggest that CS-MTPITC-α-CD film is a prospective packaging candidate for delaying the quality deterioration of chicken meat.
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Tang, Su, Nathan D. Hicks, Yu-Shan Cheng, Andres Silva, Sarah M. Fortune, and James C. Sacchettini. "Structural and functional insight into the Mycobacterium tuberculosis protein PrpR reveals a novel type of transcription factor." Nucleic Acids Research 47, no. 18 (August 26, 2019): 9934–49. http://dx.doi.org/10.1093/nar/gkz724.

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Abstract The pathogenicity of Mycobacterium tuberculosis depends upon its ability to catabolize host cholesterol. Upregulation of the methylcitrate cycle (MCC) is required to assimilate and detoxify propionyl-CoA, a cholesterol degradation product. The transcription of key genes prpC and prpD in MCC is activated by MtPrpR, a member of a family of prokaryotic transcription factors whose structures and modes of action have not been clearly defined. We show that MtPrpR has a novel overall structure and directly binds to CoA or short-chain acyl-CoA derivatives to form a homotetramer that covers the binding cavity and locks CoA tightly inside the protein. The regulation of this process involves a [4Fe4S] cluster located close to the CoA-binding cavity on a neighboring chain. Mutations in the [4Fe4S] cluster binding residues rendered MtPrpR incapable of regulating MCC gene transcription. The structure of MtPrpR without the [4Fe4S] cluster-binding region shows a conformational change that prohibits CoA binding. The stability of this cluster means it is unlikely a redox sensor but may function by sensing ambient iron levels. These results provide mechanistic insights into this family of critical transcription factors who share similar structures and regulate gene transcription using a combination of acyl-CoAs and [4Fe4S] cluster.
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Zhou, Ninglin, Xiao Xian Xia, Li Li, Shao Hua Wei, and Jian Shen. "Studies on Nanostructured Polyurethane/Clay Interpenetrating Polymer Networks." Materials Science Forum 475-479 (January 2005): 1001–4. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.1001.

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A novel exfoliated polyurethane (PU)/clay Interpenetrating Polymer Networks (IPNs) nanocomposite has been synthesized with polyurethane and organoclay. MTPAC is used as swelling agent to treat Na-montmorillonite for forming organoclay. The results indicate that there is very good compatibility between organoclay and PU. Nanoscale silicate dispersion was analyzed by XRD. The mechanical properties of the nanocomposites have been measured by tensile testing machine. The nanocomposites show obviously improved physical and mechanical properties when compared with the pure polymer. Additionally, PU /MTPAC- clay shows lower water absorption properties than pure PU do. In addition, the reinforcing and intercalating mechanism of silicate layers in polyurethane matrix are discussed.
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Krüner, Simon, and Christoph Hackl. "Experimental Identification of the Optimal Current Vectors for a Permanent-Magnet Synchronous Machine in Wave Energy Converters." Energies 12, no. 5 (March 5, 2019): 862. http://dx.doi.org/10.3390/en12050862.

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This paper investigates efficiency enhancements in Permanent-Magnet Synchronous Machines (PMSMs) used as generators in wave energy converters. A method is presented, which allows experimental identification of the optimal current vectors leading to minimal losses and maximum efficiency. Iron and inverter losses are considered. The proposed identification method is generic and is applicable to any PMSM used as a generator. The obtained results are compared to the well-known Maximum Torque per Current (MTPC) strategy. Two MTPC strategies are investigated: (i) MTPC using linearised flux linkages; and (ii) MTPC using measured, nonlinear flux linkages. For both MTPC strategies, the influence of the Voltage Source Inverter (VSI) is taken into account. All measurements are performed on a simple and cheap industrial-like test bench. All three presented methods lead to increased efficiency. The best efficiency is obtained by the proposed maximum efficiency strategy, where iron and inverter losses are taken into account by proper measurement of the optimal current vectors.
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Chen, Zhen, Changqing Feng, Haolei Chen, Ruirui Fan, Han Yi, Jiaqi Wang, and Shubin Liu. "An SCA ASIC-based multi-channel readout system for a prototype multi-purpose TPC at CSNS Back-n white neutron source." Journal of Physics: Conference Series 2374, no. 1 (November 1, 2022): 012080. http://dx.doi.org/10.1088/1742-6596/2374/1/012080.

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The back-streaming white neutron source (Back-n) at China Spallation Neutron Source (CSNS), which has excellent energy spectrum and good time resolution, provides superior conditions for neutron induced light charged particle tracking experiment. To track light charged particles, CSNS has proposed a project named Multi-purpose Time Projection Chambers (MTPC) and completed a 1519-channel prototype. A multi-channel readout system based on Switched Capacitor Arrays (SCA) waveform sampling ASIC was designed to meet the requirements of the prototype MTPC. This paper presents the structure of this readout system and the results of the beam test with MTPC at CSNS. Time of Flight spectrum of neutron beam and 3D-track of neutron induced light charged particles were successfully reconstructed. These test results prove the feasibility of large-scale MTPC.
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Hsu, Ling-Yuan, Shi-Jinn Horng, Pingzhi Fan, Muhammad Khurram Khan, Yuh-Rau Wang, Ray-Shine Run, Jui-Lin Lai, and Rong-Jian Chen. "MTPSO algorithm for solving planar graph coloring problem." Expert Systems with Applications 38, no. 5 (May 2011): 5525–31. http://dx.doi.org/10.1016/j.eswa.2010.10.084.

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Chen, Percival Yang-Ting, Heather Aman, Mehmet Can, Stephen W. Ragsdale, and Catherine L. Drennan. "Binding site for coenzyme A revealed in the structure of pyruvate:ferredoxin oxidoreductase from Moorella thermoacetica." Proceedings of the National Academy of Sciences 115, no. 15 (March 26, 2018): 3846–51. http://dx.doi.org/10.1073/pnas.1722329115.

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Pyruvate:ferredoxin oxidoreductase (PFOR) is a microbial enzyme that uses thiamine pyrophosphate (TPP), three [4Fe-4S] clusters, and coenzyme A (CoA) in the reversible oxidation of pyruvate to generate acetyl-CoA and carbon dioxide. The two electrons that are generated as a result of pyruvate decarboxylation are used in the reduction of low potential ferredoxins, which provide reducing equivalents for central metabolism, including the Wood–Ljungdahl pathway. PFOR is a member of the 2-oxoacid:ferredoxin oxidoreductase (OFOR) superfamily, which plays major roles in both microbial redox reactions and carbon dioxide fixation. Here, we present a set of crystallographic snapshots of the best-studied member of this superfamily, the PFOR from Moorella thermoacetica (MtPFOR). These snapshots include the native structure, those of lactyl-TPP and acetyl-TPP reaction intermediates, and the first of an OFOR with CoA bound. These structural data reveal the binding site of CoA as domain III, the function of which in OFORs was previously unknown, and establish sequence motifs for CoA binding in the OFOR superfamily. MtPFOR structures further show that domain III undergoes a conformational change upon CoA binding that seals off the active site and positions the thiolate of CoA directly adjacent to the TPP cofactor. These structural findings provide a molecular basis for the experimental observation that CoA binding accelerates catalysis by 105-fold.
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D’Souza, Malcolm J., Zoon Ha Ryu, Byoung-Chun Park, and Dennis N. Kevill. "Correlation of the rates of solvolysis of acetyl chloride and α-substituted derivatives." Canadian Journal of Chemistry 86, no. 5 (May 1, 2008): 359–67. http://dx.doi.org/10.1139/v08-028.

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Additional specific rates of solvolysis have been determined for acetyl chloride and diphenylacetyl chloride. These are combined with literature values to carry out correlation analyses, using the extended Grunwald–Winstein equation with incorporation of literature values for solvent nucleophilicity (NT) and solvent ionizing power (YCl). Parallel analysis are carried out using literature values for the specific rates of solvolysis of trimethylacetyl chloride, chloroacetyl chloride, phenylacetyl chloride, and α-methoxy-α-trifluoromethylphenylacetyl chloride (MTPAC). Chloroacetyl chloride and MTPAC react by an addition-elimination pathway, with the addition step rate-determining, over the full range of solvents. Acetyl chloride reacts over the full range of solvents by an ionization pathway, with considerable nucleophilic solvation. The other three substrates can solvolyze with the domination of either mechanism, depending on the properties of the solvent. Reports concerning the use of product selectivity values, kinetic solvent isotope effects, and computational studies as additional probes of the mechanism of solvolysis are discussed.Key words: Grunwald-Winstein equation, acyl chlorides, mechanism of solvolysis, solvent nucleophilicity.
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Dissertations / Theses on the topic "MtProC"

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Grytli, Tuva. "Integration of Methods for Environmental Assessment and Investment Analysis." Thesis, Norwegian University of Science and Technology, Department of Energy and Process Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-10933.

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Background, aim and scope. In this thesis a framework for integrating life cycle assessment and investment analysis is derived, aimed to (1) unite economic and environmental perspectives, and (2) strengthen system borders. The application of the model is shown in a case study of a bioenergy facility in central Norway. Prices and environmental impacts are calculated, and the results are compared to those for electricity generated from natural gas. Two examples of utilisation of the results are presented. Methods. Hybrid life cycle assessment is employed to enable the use of the price model from input-output analysis. The price model is extended to facilitate the integration of investment analysis. The resulting framework embodies all aspects from investment analysis, including tax and discounting. The result is a model performing a state of the art hybrid life cycle assessment and a net present worth analysis to obtain environmental and economic results with consistent system borders. Application. The method is applied to a case study, evaluating an electricity generating bioenergy facility in central Norway. The bioenergy facility was found to be a viable investment. Using bioenergy as an abatement measure against global warming was found to be competitive against carbon credits in the case of CO2 quota prices at the level assumed in 2030. Results and discussion. The model produced robust results comparable to those found in other studies. The framework proved to have several advantages in addition to strengthened system borders; amongst others a mutual empowerment between the two base analyses in relation to decision making, and a possibility for establishing eco-efficiency indicators.

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Ervik, Mariann. "DEVELOPMENT OF SPINEBOARD." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for produktutvikling og materialer, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19201.

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This master’s thesis is the continuation of a preliminary study conducted in the fall of 2011. The project is defined by NTNU in cooperation with Laerdal Medical. Laerdal Medical AS is a major manufacturer of medical equipment and training products based in Stavanger, Norway. They now want to make an addition to their spinal product line and offer a lower cost, but quality alternative to their existing spineboard (the BaXstrap spineboard).A spineboard is a long, flat and rigid board mainly used for the immobilization and transportation of trauma patients with suspected spinal injuries.As a basis for comparison of stiffness of the old and proposed new alternative, phys- ical tests of the BaXstrap spineboard were conducted.The new spineboard concept proposes a transition from the current rotational molding process of the BaXstrap to injection molding the new spineboard in two parts and joining them by hot plate welding.Through a part breakdown approach to the spineboard, constraint and possibilities for all design features of the spineboard were reviewed. This was based on extensive re- search through current literature, standards, competitor reviews, discussions with Laerdal and user interviews. From two final design concepts, a curved and tapered spineboard with features continued from the BaXstrap was chosen and another design iteration was performed.The results of this project has, in addition to en extensive product specification, been a CAD model, CAE analysis and a physical foam mock-up of the final design iteration of the proposed new spineboard. CAE analysis showed that the new spineboard can have better resistance to torsion and bending than the BaXstrap.Descriptions of the CAD model structures and how to prepare mesh and load cases for CAE analysis of the spineboard will be used as a basis for further development of the spineboard at Laerdal Medical.
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Roux, Charlotte. "The life cycle performance of energy using household products." Thesis, Norwegian University of Science and Technology, Department of Energy and Process Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-11012.

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The number of household gadgets that use energy, usually electricity, has multiplied in recent decades and energy use in a category that was long called “other” has risen significantly. In the mean time, another concern has arisen: the carbon cost related to the production and disposal of the gadgets. Investigating household electric and electronic equipment (EEE) as a specific household consumption category, the objective of this project is to get more understanding of their consumption and of their carbon footprint over there life-cycle. Space and water heating as well as lighting are excluded. The focus is on Norwegian household carbon footprint considering its specificities both in terms of consumption patterns, external trade and energy mix. First, an economic and statistical analysis of product ownership is conducted. It uses several data sources, such as the recent REMODECE campaign, sales data, lifetime estimation, EE-register data (registration of input and output of Electric and electronic equipment on the Norwegian market) and data from statistical office of Norway. Second, the project aims to record, analyze and compare different sources of information considering production and end-of-life. Both bottom up and top down approaches are investigated, even if a stress is put on bottom-up studies, such as ongoing European EuP study with its Ecoreport tool and EcoInvent database. Third it gives a best estimate of EEEs share in household carbon footprint, found to be 8,1% at 1,5 tons of CO2equivalent per household with production phase as a main contributor. A discussion on uncertainties assessing precision and identifying information gaps is also conducted. In addition to facilitate further research by setting up a framework grouping information sources critically analyzed, this project highlights the increasing importance of EEE products regarding sustainable consumption by putting numbers on the table.
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Vilberg, Ingrid Kristine. "Airbag for piping systems." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12280.

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Pressure transients are caused by a change in the volumetric flow in a pipeline system, and can have severe consequences for rapid changes of the volumetric flow. A sudden closure of a valve is a common source of a pressure transient, and the pressure increase in front of the valve depends on the flow rate and the wave propagation velocity in the fluid and pipe. A gas-liquid mixture can have a very low wave propagation velocity, even for small air contents, and is effective in terms of damping due to the compressibility effects of the gas bubbles. With these alterations of the fluid properties the pressure transient will be weakened with reduced amplitude and an increased period, which are beneficial effects for the pipeline system.A simple experiment was carried out to investigate the practical solutions for the air injection system, and the results showed that the presence of air was beneficial in terms of a reduction of the amplitude and increased damping of the pressure transient. However, a few aspects should be revised in a refinement of the experiment. The air flow rate and duration were uncertain because of water accumulating in the air hose, and the timing of the gate valve closure was challenging.Simulations of various models of pipe systems were carried out in Flowmaster. The models are sufficient for simulation of ordinary pipes with a rapid closure of a valve, but fall short at modeling an air-water mixture. This is because only the reduced wave propagation is taken into account, and not the effects of the bubbles.
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Hjetland, Even. "Design av bladprofil for en stor ventilator." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12882.

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Institutt for Energi- og Prosessteknikk ved NTNU gikk, for en tid tilbake, til innkjøp av en fullskala ventilator av typen som Vegdirektoratet i Norge benytter til ventilering i tunneler. Motivasjonen bak innkjøpet var et ønske om å drive utviklingsarbeid rundt impellerdesign, da Vegdirektoratet ved flere anledninger opplevde at innkjøpte ventilatorer ikke overholdt produsentens egne spesifikasjoner. Denne oppgaven er et ledd i dette arbeidet, og har som målsetning å utvikle bladgeometri spesielt for denne typen applikasjon, for en fembladet impeller som kan tilpasses på det originale navet, og med bedret ytelse sett i forhold til den originale impelleren. Geometridesignet tar utgangspunkt i et løfteprofil utviklet på instituttet noen år tilbake med spesielt godt løft-per-motstandsforhold, men såkalt skarpe steilingsegenskaper. Bestemmelse av fordeling av kordelengde og geometrisk vridning langs bladets radius, er gjort ved hjelp av bladelementmetoden programmert i matrisebehandlingsprogrammet . Geometrien er meshet i MatLab og etterprøvet i CFD-programmet Fluent for konstant rotasjonshastighet og varierende volumstrøm, og resultatene er sammenliknet med testdata fra den originale impelleren. Sammenligningsprosessen er vanskeliggjort av at mengden av tilgjengelig testdata fra den originale impelleren, eller liknende impellere, er svært begrenset. Sammenligningen som er gjort, indikerer imidlertid at det nye impellerdesignet har høyere virkningsgrad og høyere spesifikk skyvkraft over hele arbeidsområde enn den originale. I bladelementprogrammet ble ett blad delt inn i 20 elementer. Geometrien er lagret som 21 .dat-filer med profilkoordinater i alle tre romlige retninger for de 21 profilveggene som skiller disse 20 elementene.
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Gjerde, Joachim Dyrstad. "Transient Flow in Gas Transport." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12992.

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Transport of natural gas to continental Europe and UK is a large portion ofNorwegian petroleum industry. The gas is mainly transported undersea inlarge-scale transport pipelines. Amount of transported gas is currently closeto maximum capacity of the pipeline network, and as a consequence the gastransport must be careful planned so that the optimal capacity can be utilized.An important tool in this planning is the use of computational method topredict the flow. Accurate computational tools is therefore of great value whenpredicting the pressures and flow rates in transient cases such as opening of avalve or shut down of a flow. This report is a part of a major research projectinitiated by Gassco, for better flow-predictions models in natural gas pipelines.A computational model based on the method of characteristics has beendeveloped. In this report the main focus is on the solution of the energy equationand introduction of this equation to an already existing code solving for pressureand mass flux. The method is verified using measured values of pressure at theinlet.Since much of the uncertainty is related to the transients, this report focuseson transient cases. The old program solving the characteristic equations using anisothermal assumption actually proves surprisingly accurate, and the additionalsolution of temperature does not significantly improve the results. The methodhowever does not provide satisfactory results at the larger transients.If large temperature gradients are imposed on the solver we see instabilities inthe flow and it affects the solution of the parameters. The Joule Thomson effectthat we have in our solution also results in a much higher drop of temperaturethan what can be measured, in case of pressure drop at the inlet.From the results we also see that the coefficient that is supposed to correctfriction factor for additional drag effects, also should be a function of pressureand/or Reynold number. If such a correlation would provide more accurateresults in the transient has not been debated, but more accurate correlation offriction depending on flow rate would probably give a more accurate result.Also worth noticing is that the method does not have a clear convergence,or reduction of error as the number of calculation points increases. It givessmaller extreme values, but average error is not reduced significantly. This isprobably a result of the reduced effect of missing convective-term as the gridhas a finer resolution and time-step decreases and the effect of loss of velocityin the characteristic becomes small.As a simple tool for calculation of gas transport in pipelines, the isothermalmethod of characteristics proves to give surprisingly accurate results. However,for more complex systems, i.e. including the temperature and variable propertiessuch as compressibility and density, finite difference methods are more versatile.Finite difference methods can be done implicit, giving a more stable solver, andit’s simpler to account for some of the effects such as temperature etc.iv
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Salthaug, Marie. "Blade Dynamic Response for Downwind Turbines." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13444.

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A MATLAB script has been developed to investigate dynamics in the blades of a 10 MW downstream wind turbine, with both a tubular- and a truss tower. The classical Beam element momentum method with additional correction factors are used to determine forces on the blade. Centrifugal loading have been applied by use of an iteration method. Blade dynamic response is investigated in terms of Modal analysis. In addition, the dynamic response of a blade with adjusted stiffness has been investigated. Three approaches to obtain the wind velocity field in the rotor plane are studied; averaged Blevins model with input from a study in ANSYS FLUENT, Wind files extracted from ANSYS FLUENT, and results from a small scale wind tunnel experiment. The three cases provide ambiguous results with regards to blade deflection and root flapwise bending moment. Results indicates that vortex shedding have large effect in a tubular tower configuration, but small effect in a truss tower configuration. Based the most the most trusted input, the wind tunnel case, the results indicates that a truss tower would provide more desired values in terms of root flapwise bending moment and fatigue loading.
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Breivik, Simen Røst. "CFD-analyse av løpehjul og sugerør i en Francis turbin." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13653.

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Denne masteroppgaven evaluerer svingningene is sugerørsstrømingen til en Francis turbinved dellast. Bakgrunnen for dette studiet er delvis på grunn av verdens økende energibehov. Med varierende energipriser og vannivåer i magasinene opererer vannturbiner på varierende last. Operasjon ved fullast og dellast skaper trykkpulsasjoner i turbinen, hvor en av årsakene er ustabil strømning i sugerøret. Hovedmålet med denne oppgaven er å gjennomføre en CFD-analyse av løpehjulet og sugerøret i en Francis turbin ved dellast.Resultatene fra CFD-analysen stemmer godt overens med modelltesten gjennomført i Vannkraftlaboratoriet. Ved bestpunktet er sugerørsstrømingen symmetrisk og stabil både i CFD-analysen og i laboratoriet.Ved fullast er søgerørsstrømningne også symmetrisk og stabil, men det er et stort lavtrykksområde under løpehjulets boss. I laboratoriet kaviterte vannetpå grunn av det lave trykket. Ved dellast blir sugerørsstrømingen ustabil, og trykkpulsasjoner ble målt. En sugerørsvirvel formet som en korketrekker oppstod i sugerørskonusen i laboratoriet. CFD analysen er en-fase, uten mulighet for å kavitere, men en trykkoverflate viser en tilsvarende virvelform i sugerørskonusen.Frekvensen på trykkpulsasjonene målt ved dellast stemmer godt med den teoretiskefrekvensen ved det samme operasjonspunktet.
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Kristjansson, Kolbeinn Jakob. "Utvikling av et hybrid varmerør for høytemperatur anvendelser." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-15685.

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Det første målet med denne masteroppgaven er å utvikle en prosedyre for å vakuumere, fylle og forsegle et varmerør (heat pipe). Varmerør benyttes for å transportere varme med lave temperaturdifferanser. Ved høye temperaturer er det fordelaktig å ta i bruk kalium som arbeidsmedium i varmerør. I denne rapporten er det utarbeidet en metode for sikker vakuumering, fylling og forsegling av et varmerør med kalium som arbeidsmedium. Det er i tillegg utviklet en prosedyre for hvordan hele prosessen skal gjennomføres. En turbomolekylærpumpe skal brukes for å generere vakuum, og sammen med varmeelement utgasse varmerøret. Et påfyllingskammer benyttes for å smelte og overføre kalium, mens induksjonssveising skal benyttes for å forsegle varmerøret. Med prosedyren som er utviklet er det ventet at man vil få et lekkasjefritt varmerør med veldig ren kalium som arbeidsmedium.Det andre målet med denne oppgaven er å utarbeide en numerisk beregningsmodell for strømning i porøse medium. Beregningsmodellen skal kunne vise effekten av ujevnt varmepådrag på strømningen i veken. Et høyt varmepådrag i et lite område av veken vil gi mye avdamping i dette området. Dette vil føre til at man får 3D strømning. På grunn av at tykkelsen til veken er veldig liten, er det ventet at man får lite variasjon i tykkelsesretningen, og modellen kan forenkles til 2D strømning. Beregningsmodellen som er utarbeidet benytter Darcys lov, i kombinasjon med kontinuitetsligningen for masse, for å beregne det stasjonære trykk- og hastighetsfeltet som oppstår på grunn av et varmepådrag. Varmepådraget kan være uniformt eller ujevnt.Fordelingen av varmefluksen har mye å si for total varmetransportkapasitet for veken. En varmedistribusjon som fører til en høy fluks øverst i veken vil gi en lavere total varmestrøm enn en tilsvarende varmedistribusjon der den høye fluksen er plassert nede i veken. Det er sett på mange ulike varmepådrag, og effekten disse varmepådragene har på vekekapasiteten.
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10

Holo, Anders Linde. "CFD-analyse av en høytrykks Francis turbin." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-16770.

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I denne masteroppgaven har det blitt gjennomført «fluid structure interaction» (FSI) simuleringer av modellturbinen fra Tokke, ved innløpsbetingelser som var rapportert å gjelde ved best driftspunkt. Simuleringsresultatene ble sammenlignet med laboratoriemålinger. Simuleringsresultatene viser at turbinene opererte nære, men ikke helt på beste driftspunkt, og at simuleringsresultatene er nesten like laboratoriemålingene. Virkningsgradsavviket mellom simuleringsresultatene og laboratoriemålingene 5.2%. Avviket i trykkhøyde mellom simuleringsresultatene og laboratoriemålingene er 0.2m. Dette tilsvarer et avvik på mindre enn én prosent. Avviket i trykkhøyde og virkningsgrad mellom simuleringsresultatene og laboratoriemålingene er små og simuleringsresultatene er derfor vurdert til å være tilfredsstillende.For å studere trykkpulsasjonene fra ledeskovlene, ble fire «steady state» FSI simuleringer gjennomført. For hver av simuleringene ble løpehjulet litt rotert i forhold til ledeapparatet. Dette ble gjort for å dekke en hel lastsyklus for løpehjulet. Deretter ble spenningen i to punkter i turbinbladet, som ble plassert i områder med stor spenning, studert for alle fire simuleringene. Den største dynamiske spenningen er 5.86Mpa, hvor den gjennomsnittlige spenningen er 18.42Mpa. Følgelig utgjør den dynamiske spenningen 31.8% av den totale spenningen. Det er liten forskjell i spenningsverdier mellom laboratoriemålingene og simuleringene. Forskjellene i maksimumsspenningene mellom simuleringsresultatene og lab- resultatene kan være på grunn av den lille forskjellen i målepunktlokasjonene, men også på grunnen av usikkerhet i «computational fluid dynamics» (CFD) og «finite element method» (FEM) simuleringene, men også måleusikkerhet. Likevel er det en sterk korrelasjon mellom simuleringer og laboratoriemålinger, og den ville blitt enda sterkere hvis finere mesh kunne blitt brukt, og et større lastområde ville blitt undersøkt. Mangel på datakraft var en begrensing for simuleringene. Både FSI simuleringsresultatene og laboratoriemålingene viser at dynamiske spenninger utgjør en stor prosentandel av de totale spenningene. Derfor, i tillegg til foreliggende parametere, burde energiselskapene vise kjøreplanen i spesifikasjonene til turbinprodusentene. Kjøreplanen ville gitt turbinprodusentene den nødvendige informasjonen slik at det kunne bli tatt høyde for dynamiske laster i turbindesign.
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Books on the topic "MtProC"

1

International Conference on Modern Trends in Physics Research (2nd 2006 Cairo, Egypt). Modern trends in physics research: Second International Conference on Modern Trends in Physics Research, MTPR-06, Cairo, Egypt, April 6-11, 2006. Edited by El Nadi Lotfia. Melville, N.Y: American Institute of Physics, 2007.

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Lotfia, El Nadi, ed. Modern trends in physics research: First International Conference on Modern Trends in Physics Research, MTPR-04, Cairo, Egypt, 4-9 April 2004. Melville, N.Y: American Institute of Physics, 2005.

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Modern Trends In Physics Research Third International Conference On Modern Trends In Physics Research Mtpr08 Cairo Egypt 610 April 2008. World Scientific Publishing Company, 2011.

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GOD AND MAN. CECIL JUSTIN LAM/CHRISTIANIC CANADIANA COLLECTIONS/C.P.M,, 1987.

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Nadi, Lotfia M. El. Modern Trends of Physics Research: First International Conference on Modern Trends of Physics Research; MTPR-04 (AIP Conference Proceedings). American Institute of Physics, 2005.

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Conference papers on the topic "MtProC"

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Miculan, Marino, and Nicola Vitacolonna. "Automated Symbolic Verification of Telegram’s MTProto 2.0." In 18th International Conference on Security and Cryptography. SCITEPRESS - Science and Technology Publications, 2021. http://dx.doi.org/10.5220/0010549601850197.

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Jakobsen, Jakob, and Claudio Orlandi. "On the CCA (in)Security of MTProto." In CCS'16: 2016 ACM SIGSAC Conference on Computer and Communications Security. New York, NY, USA: ACM, 2016. http://dx.doi.org/10.1145/2994459.2994468.

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Miculan, Marino, and Nicola Vitacolonna. "Automated Symbolic Verification of Telegram’s MTProto 2.0." In 18th International Conference on Security and Cryptography. SCITEPRESS - Science and Technology Publications, 2021. http://dx.doi.org/10.5220/0010549600002998.

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Job J, Naresh V, and K. Chandrasekaran. "A modified secure version of the Telegram protocol (MTProto)." In 2015 IEEE International Conference on Electronics, Computing and Communication Technologies (CONECCT). IEEE, 2015. http://dx.doi.org/10.1109/conecct.2015.7383884.

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Yang, Yucun, Weiwei He, and Suili Feng. "Security Analysis and Amendment of 3G Core Network Based on MTPsec." In 2008 Pacific-Asia Workshop on Computational Intelligence and Industrial Application (PACIIA). IEEE, 2008. http://dx.doi.org/10.1109/paciia.2008.112.

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Sharma, Yashvardhan, and Sheetal Sisodia. "Temperature Prediction Based on Fuzzy Time Series and MTPSO with Automatic Clustering Algorithm." In 2014 2nd International Symposium on Computational and Business Intelligence (ISCBI). IEEE, 2014. http://dx.doi.org/10.1109/iscbi.2014.29.

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Nilima, Sharon, M. Gowtham, H. B. Pramod, D. K. Manasa, and Raymond Melvin. "Performance Analysis of EPAR, DSR and MTPR in MANET’S." In 2020 International Conference on Recent Trends on Electronics, Information, Communication & Technology (RTEICT). IEEE, 2020. http://dx.doi.org/10.1109/rteict49044.2020.9315663.

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Zhong Zhou and Yuming Mao. "A new QoS routing scheme in mobile ad hoc network - Q-MTPR." In 2004 International Conference on Communications, Circuits and Systems. IEEE, 2004. http://dx.doi.org/10.1109/icccas.2004.1346111.

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Pang-Kai Liu, Szu-Yao Hung, Chang-Yi Liu, Min-Han Hsieh, and Charlie Chung-Ping Chen. "A 52 dBc MTPR line driver for powerline communication HomePlug AV standard in 0.18-μm CMOS technology." In 2013 IEEE International Symposium on Circuits and Systems (ISCAS). IEEE, 2013. http://dx.doi.org/10.1109/iscas.2013.6572118.

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Eldeeb, Hisham, Christoph M. Hackl, Julian Kullick, and Lorenz Horlbeck. "Analytical solutions for the optimal reference currents for MTPC/MTPA, MTPV and MTPF control of anisotropic synchronous machines." In 2017 IEEE International Electric Machines and Drives Conference (IEMDC). IEEE, 2017. http://dx.doi.org/10.1109/iemdc.2017.8002005.

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Reports on the topic "MtProC"

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Tawfik, Walid. https://doi.org/10.19138/mtpr/(20)1-5. MTPR Journal, January 2020. http://dx.doi.org/10.19138/mtpr/(20)1-5.

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