Relevant bibliographies by topics / MtProA

Academic literature on the topic 'MtProA'

Author: Grafiati
Published: 6 September 2023

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Journal articles on the topic "MtProA"

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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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Mosaddegh Hesar, Hamidreza, Hossein Abootorabi Zarchi, and Gholamreza Arab Markadeh. "Online MTPTA and MTPIA Control of Brushless Doubly Fed Induction Motor Drives." IEEE Transactions on Power Electronics 36, no. 1 (January 2021): 691–701. http://dx.doi.org/10.1109/tpel.2020.3000150.

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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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Arjaya, Ida Bagus Ari, and Kadek Rahayu Puspadewi. "PENERAPAN MODEL TRI PRAMANA SPA DITINJAU DARI MOTIVASI SISWA TERHADAP KETERAMPILAN BERPIKIR KRITIS SISWA." Jurnal Santiaji Pendidikan (JSP) 7, no. 2 (August 31, 2017): 180–92. http://dx.doi.org/10.36733/jsp.v7i2.66.

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The purposes of this research are to analyze: 1) The difference of critical thinking ability between Model Tri Pramana SPA (MTPSPA) and Model Pembelajaran Konvensional (MPK), 2) the differences in critical thinking skills between MTPSPA and MPK in students with high learning motivation, 3) The differences in critical thinking skills between MTPSPA and MTPSPA in students with low learning motivation, 4) The interactive effect between learning model and learning motivation toward students' critical thinking ability. The population of this study was all students of SMP Negeri 7 Denpasar academic year 2016/2017. The Samping technique that was used was group random sampling method with a quasi experiment design. The prerequisite data analysis consisted of internal validity analysis and interrater reliability. Two Way Analyze of Variant (ANAVA) by using SPSS 17 for Windows Software was used as the data analysis technique. The result of the present study are 1) there was significant difference of students’ critical thinking between MTPSPA and MPK (p=0,000 < α = 0,05), 2) there was significant difference of students’ critical thinking between MTPSPA and MPK for high motivation (p=0,000 < α = 0,05), 3) there was significant difference of students’ critical thinking between MTPSPA and MPK for low motivation (p=0,000 < α = 0,05), 4) there is no interaction effect between learning model and students’ learning motivation toward students' critical thinking (p = 0,482> α = 0,05).
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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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Hamui, Leon, María Elena Sánchez-Vergara, Rocio Sánchez-Ruiz, Cecilio Álvarez-Toledano, Jose Luis Reyes-Rodriguez, and Arturo Ponce. "Growth and Structural Characterization of Doped Polymorphic Crystalline MgPc as an Organic Semiconductor." Crystals 10, no. 6 (June 8, 2020): 495. http://dx.doi.org/10.3390/cryst10060495.

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The doping and crystallization of the molecular semiconductor formed from the magnesium phthalocyanine (MgPc) and 1-(4-Methoxyphenyl)-2,2,6,6-tetramethyl-5-phenylhepta-3,4-dienedioic (MTPDA) acid was carried out in this work. The crystals obtained were characterized by using transmission electronic microscopy (TEM), Raman spectroscopy, and X-Ray diffraction (XRD), to later evaluate their optical behavior. Raman, IR, and UV–Vis results indicate that the MgPc has been doped with the MTPDA. A uniform material layer with particles is observed as a result of a two-stage process, nucleation and growth. The polycrystalline films are constituted by a mixture of α and β phases with crystalline sizes of ~7 nm, 14 nm, and 20 nm average sizes. The films exhibit a preferred orientation along the [001]. The MTPDA doping does not have an important effect on the molecule planar distances indicating that the MTPDA molecule is among the equivalent MgPc plane direction. A transparent region with a minimum at 483 nm is observed, also a B-band at 337 nm and a Q-band transition with a high-energy peak around 639 nm, and a low energy peak around 691 nm.
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Zorlu, Yunus, Doğan Erbahar, Ahmet Çetinkaya, Aysun Bulut, Turan S. Erkal, A. Ozgur Yazaydin, Jens Beckmann, and Gündoğ Yücesan. "A cobalt arylphosphonate MOF – superior stability, sorption and magnetism." Chemical Communications 55, no. 21 (2019): 3053–56. http://dx.doi.org/10.1039/c8cc09655d.

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We report a novel metal organic framework (MOF) based on a cobalt arylphosphonate, namely, [Co2(H4-MTPPA)]·3NMP·H2O (1·3NMP·H2O), which was prepared solvothermically from the tetrahedral linker tetraphenylmethane tetrakis-4-phosphonic acid (H8-MTPPA) and CoSO4·7H2O in N-methyl-2-pyrrolidone (NMP).
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Li, Chengxu, Wenjuan Zhang, Jian Gao, and Shoudao Huang. "Permanent Magnet Flux Linkage Analysis and Maximum Torque per Ampere (MTPA) Control of High Saturation IPMSM." Energies 16, no. 12 (June 15, 2023): 4717. http://dx.doi.org/10.3390/en16124717.

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The maximum torque per ampere (MTPA) control is significant for improving the efficiency of the interior permanent magnet synchronous motor (IPMSM). However, for the high saturation IPMSM, the change of the permanent magnet (PM) flux linkage is more complicated, which can cause the MTPA control to deviate from the optimal solution. Therefore, an improved MTPA control method for the high saturation IPMSM is proposed in this paper. Compared with other methods, the proposed method improves the conventional models of flux linkage and torque by analyzing the nonlinear variation of the PM flux linkage with the dq-axis currents. Subsequently, an expression suitable for the MTPA control of high saturated IPMSM is derived based on the improved models. The proposed parameter fitting models are then fitted using data from 11 operating points and incorporated into the MTPA optimization algorithm to obtain the MTPA curve. Finally, the effectiveness of the proposed method in enhancing the control accuracy of the MTPA angle is verified through simulations and experiments.
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Svatoš, Aleš, Irena Valterová, David Šaman, and Jan Vrkoč. "Direct esterification of 2-methoxy-2-phenyl-3,3,3-trifluoropropionic acid: A reinvestigation." Collection of Czechoslovak Chemical Communications 55, no. 2 (1990): 485–90. http://dx.doi.org/10.1135/cccc19900485.

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The direct esterification of enantiomeric 2-methoxy-2-phenyl-3,3,3-trifluoropropionic acids (MTPA) was reinvestigated. Preferential formation of one of the diastereoisomeric esters was avoided by using three equivalents of MTPA. Chromatographic behaviour of the obtained MTPA esters is discussed.
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Bulut, Aysun, Michael Wörle, Yunus Zorlu, Erdogan Kirpi, Huseyin Kurt, Jon Zubieta, Simon Grabowsky, Jens Beckmann, and Gündoğ Yücesan. "A potential Cu/V-organophosphonate platform for tailored void spacesviaterpyridine mold casting." Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 73, no. 2 (March 29, 2017): 296–303. http://dx.doi.org/10.1107/s2052520617000245.

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The reaction of appropriate copper and vanadium salts with tetratopic methane tetra-p-phenylphosphonic acid (MTPPA) in the presence of 2,2′:6′:2′′-terpyridine (terpy) yielded the three-dimensional bimetallic copper vanadium phosphonate framework [{Cu(terpy)}4Cu(VO2)4(MTPPA-H)2]·4H2O (1). Terpy has no net contribution to the three-dimensional structure providing a potential platform for void space formationviamold-casting. The structure was characterized by single-crystal X-ray diffraction and thermogravimetric analysis (TGA). Magnetic measurements were performed using a SQUID magnetometer. The crystal structure of the methanol solvate of the free ligand, MTPPA·MeOH, was analysed using Hirshfeld surfaces and fingerprint plots.
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Dissertations / Theses on the topic "MtProA"

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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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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 "MtProA"

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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Bentes, Rosineide da Silva. Série Vidas, Volume I: A Medicina Tradicional Popular Amazônica (MTPA) e Temas Afins (Coleção Série Vidas. v. 1). EDITORA CRV, 2019. http://dx.doi.org/10.24824/978854443439.0.

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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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Vaez-Zadeh, Sadegh. Direct Torque Control. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198742968.003.0004.

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The fundamental principles of direct torque control (DTC) of permanent magnet synchronous (PMS) motors are presented in this chapter. The basic DTC system is then described. The operating limits of PMS machines under DTC are presented in terms of current limit, voltage limit, and flux linkage limit. Also, flux linkage control, including maximum torque per ampere (MTPA), unity power factor, and flux weakening at high speed, is derived. Then, alternative DTC schemes, including different SVM-DTC schemes, are presented. In line with the increasing energy-saving tendency in industrial applications, major emphasis is placed on the loss minimization of DTC. Finally, a comprehensive comparison was made between the basic DTC and vector control, emphasizing the pros and cons of DTC with respect to vector control.
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Vaez-Zadeh, Sadegh. Vector Control. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198742968.003.0003.

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The chapter begins with a description of the scalar control of PMS motors. The fundamentals of PMS motor vector control (VC) are then presented with an eye on the analogy with DC motor operating principles. The VC of surface-mounted permanent magnet pole motors and interior permanent magnet (IPM) motors are presented in various reference frames. Current and voltage operating limits are incorporated into the control systems. Flux control modes of operation of PMS motors together with the corresponding control means in different reference frames are also presented in detail, as a particular feature of this book. These include maximum torque per ampere (MTPA) control, maximum torque per voltage control, and unity power factor control. Finally, loss minimization control by offline and online strategies is elaborated after presenting the method of motors loss reduction and the PMS motor loss modeling.
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Book chapters on the topic "MtProA"

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Chang, Mengting, Qihang Sun, Yicheng Jia, Qingquan Jia, and Zhenguo Li. "MTPA Control Strategy of BLDCM Based on Back-EMF Orientation." In Conference Proceedings of 2022 2nd International Joint Conference on Energy, Electrical and Power Engineering, 675–80. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-4334-0_83.

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Du, Huiqing, Sen Yang, Yuming Liu, Kefan Liu, and Chao Xu. "Design and Implementation of MTPA and Flux Weakening Control for IPMSM." In Proceedings of the 5th International Conference on Electrical Engineering and Information Technologies for Rail Transportation (EITRT) 2021, 400–410. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9905-4_47.

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Jin, Shi, Wang Jiang, Wuhen Jin, and Yujiang Sun. "A MTPA Control Strategy for Permanent Magnet/Reluctance Hybrid Rotor Dual-Stator Motor." In Lecture Notes in Electrical Engineering, 232–40. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1870-4_25.

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Ha, Vo Thanh, and Pham Thi Giang. "Field—Weakening Control with Maximum Torque Per Ampere (MTPA) for Electric Vehicle (EV) Application." In Computational Intelligence Methods for Green Technology and Sustainable Development, 531–41. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-19694-2_47.

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Qin, Yihong, Peng Zhou, and Haiping Xu. "Post-fault MTPA Operation Based on Virtual-Signal-Injection Control for Fault-Tolerant Five-Phase IPMSM." In Lecture Notes in Electrical Engineering, 1290–300. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-0451-8_130.

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Kristianingtyas, Klara Dwi, and Masafumi Miyatake. "Design of Optimal Train Speed Profile for PMSM Railway Traction System Using Dynamic Programming with MTPA Control Method." In Urban Rail Transit, 291–309. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5979-2_17.

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Seco, Josi M., Emilio Quiqoa, and Ricardo Riguera. "Practical Aspects of the Preparation of the Derivatives." In The Assignment of the Absolute Configuration by NMR using Chiral Derivatizing Agents. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780199996803.003.0005.

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Most of the NMR spectra shown in this book and in the literature have been recorded at 250 or 300 MHz, with a few being obtained at 500 MHz for 1H NMR (the equivalent for 13C NMR). No special pulse sequences are necessary, just standard one-dimensional (1D) spectra although two-dimensional (2D) experiments (e.g., correlation spectroscopy; COSY) may be necessary in some cases in order to get an unambiguous identification of the signals relevant for the assignment. In general, 5–10 mg or less of CDA derivative dissolved in 0.5 mL of deuterated solvent are sufficient to obtain a good NMR spectrum. Temperature, solvent, and concentration used in the NMR experiments should be adequate for each CDA-substrate pair and methodology, because the method is based on the conformational composition of the AMAA derivatives in precise conditions. With the exception of the low-temperature procedure (single derivatization), a NMR probe temperature around 300 K has always been used. In general, the spectra for double-derivatization assignments should be taken in deuterated chloroform. Different NMR solvents are required only in two of the single-derivatization methods. In the assignment by low-temperature NMR, the most convenient solvent is a CS2/CD2Cl2 (4:1) mixture, which allows the use of temperatures low enough (i.e., 213 K) to obtain relevant shifts. In the procedure based on the complexation with Ba2+, the NMR solvent should be deuterated acetonitrile. The barium salt is anhydrous Ba(ClO4)2, which can be added directly to the tube by using a spatula. No weighing is necessary after shaking, as the excess salt will remain at the bottom of the NMR tube and will not disturb the experiment. (R)- and (S)-MPA, MTPA, and Boc-phenylglycine (BPG) are commercially available and can be used without further purification. The first two (MPA and MTPA) can also be purchased as acid chlorides. When using MTPA or the corresponding acid chloride [85] for the derivatization of an alcohol or amine, it should be noted that the Cahn-Ingold-Prelog priority rules assign different R/S descriptors to the acid and to the corresponding chloride; this is due to the different priority order generated by the substituents [i.e., (R)-MTPA generates the (S)-acid chloride and vice versa].
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Seco, Josi M., Emilio Quiqoa, and Ricardo Riguera. "Assignment of the Absolute Configuration of Monofunctional Compounds by Double Derivatization." In The Assignment of the Absolute Configuration by NMR using Chiral Derivatizing Agents. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780199996803.003.0006.

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The assignment of secondary alcohols can be carried out by using one of several CDAs [13–15]. The most used and most reliable ones are MPA, 9-AMA, and MTPA [35–40]. Figure 3.1 shows their structures, the correlation models, and a summary of the experimental conditions. MPA and 9-AMA esters share the same conformational composition [37, 39] and only differ in the intensity of their shieldings; therefore both auxiliaries present the same correlation between sign distribution and stereochemistry. MTPA has a different conformational composition and correlation model [38]. As shown in Chapter 1, MPA esters of secondary alcohols and other AMAA esters (e.g., 9-AMA esters) are composed of two sp/ap conformers in fast equilibrium [37, 39]. The sp conformer is more stable than the ap conformer, and this allows the NMR spectrum of an AMAA ester to be interpreted as if it had originated from just the sp form: carbonyl, Cα, and methoxy groups in the auxiliary part and a methine group (Cα′-H) at the alcohol moiety are in the same plane. When we consider this conformation in the (R)- and the (S)-AMAA esters, the L1 group is located under the shielding cone of the aryl in the (R)-AMAA ester, while the L2 is shielded in the (S)-AMAA ester (we strongly recommended that the reader builds Dreiding, or similar, models to assist in visualizing this spatial array). A subtraction defined as the chemical shift in the (R)-AMAA ester minus that in the (S)-AMAA ester results in a negative value for L1 and a positive one for L2 (i.e., negative ΔδRS for L1 and positive ΔδRS for L2). Therefore, for any secondary alcohol derivatized as an AMAA ester, the protons showing a positive ΔδRS sign are located in the tetrahedron around the asymmetric carbon (Cα′) as L2 (at the back) while the protons resulting in a negative ΔδRS take the position of L1.
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Seco, Josi M., Emilio Quiqoa, and Ricardo Riguera. "Assignment of the Absolute Configuration of Polyfunctional Compounds." In The Assignment of the Absolute Configuration by NMR using Chiral Derivatizing Agents. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780199996803.003.0008.

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From a practical point of view, the assignment of the absolute configuration of sec/sec 1,2- and 1,n-diols does not require the separate derivatization (two different steps with the CDA of choice) of each one of the two hydroxyl groups present in the substrate; on the contrary, it can be carried out by simultaneous derivatization of the two hydroxyls (a single step), leading to the corresponding bis-(R)- and bis-(S)-CDA esters [13, 59–61]. The most used CDAs are 9-AMA and MPA [59, 60], although 1-NMA, 2-NMA, and MTPA are also appropriate [59, 60]. This assignment has an important difference compared to that of monofunctionalized compounds [15]; this is due to the presence in the bis-(R)- and bis-(S)-derivatives of two CDA units that produce distributions of ΔδRS and ΔδSR signs that do not follow the trends found in monoderivatized compounds [13, 15, 82]. This means that the NMR spectra of the bis-CDA derivatives cannot be interpreted as if they had originated from two isolated mono-CDA derivatives [82]. Thus, the correlations described for secondary alcohols [35–39] cannot be applied to diols [59–61] because the chemical shifts and ΔδRS values result from the combination of the anisotropic effects—usually shielding—from the two CDA units and not from a single unit, as happens with monoalcohols. A result of the combination of aromatic shielding effects [59, 60] in diols is that the diagnostic protons/signals for assignment are not always the same as in isolated monoalcohols (i.e., L1/L2). For instance, in acyclic syn-1,2-diols, the diagnostic signals [59, 60] are those corresponding to the protons at the alpha positions of the OH groups (i.e., the hydrogens linked directly to the asymmetric carbons) Hα(R1) and Hα(R2) exclusively. On the other hand, in acyclic anti-1,2-diols, the diagnostic signals are from Hα(R1)/Hα(R2) together with those from R1 and R2. As in the case of monofunctional compounds, the assignment consists [13, 59, 60] in the preparation of two bis-CDA derivatives from the two enantiomers of the chosen CDA, followed by comparison of the corresponding NMR spectra and calculation of the ΔδRS (or ΔδSR in the case of MTPA) signs for Hα(R1), R1, Hα(R2), and R2.
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Radeva, Petia. "Morphologic TPA (mTPA) and composite risk score for moderate carotid atherosclerotic plaque is strongly associated with HbA1c in a diabetes cohort." In Vascular and Intravascular Imaging Trends, Analysis, and Challenges, Volume 2. IOP Publishing, 2019. http://dx.doi.org/10.1088/2053-2563/ab0820ch8.

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Conference papers on the topic "MtProA"

1

Stoyanov, Radostin, and Noa Zilberman. "MTPSA." In CoNEXT '20: The 16th International Conference on emerging Networking EXperiments and Technologies. New York, NY, USA: ACM, 2020. http://dx.doi.org/10.1145/3426744.3431329.

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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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SILVA, EDUARDO CATTANI, LUCAS ROSSATO ROCHA, and RODRIGO PADILHA VIEIRA. "Estratégia MTPA para a Máquina IPMSM de Baixo Custo Computacional Baseada em Polinômios de Lagrange." In Seminar on Power Electronics and Control (SEPOC 2021). sepoc, 2021. http://dx.doi.org/10.53316/sepoc2021.025.

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Esse trabalho apresenta uma abordagem para implementação do algoritmo MTPA para micro-controladores de baixo custo e desempenho, visando aplicação industrial. Devido à complexidade matemática do MTPA, muitos algoritmos propostos demandam alto desempenho computacional, impossibilitando a implementação em microcontroladores com reduzida capacidade. Nesse trabalho serão utilizados métodos numéricos afim de reduzir o custo computacional e obter aproximações com elevada precisão. Afim de validar os resultados, serão realizadas simulações em hardware e em software.
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Lee, Wonhee, Kwanghee Nam, and Jaehong Kim. "Analytic MTPA Solution for Synchronous Reluctance Machine." In 2019 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2019. http://dx.doi.org/10.1109/ecce.2019.8912720.

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Lau, Hon Chung, and Samir Piriyev. "Decarbonizing FPSO Operations in West Africa by Offshore Wind Energy." In Offshore Technology Conference. OTC, 2022. http://dx.doi.org/10.4043/31953-ms.

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Abstract The tropical waters of West Africa is a top growth region for floating, production, storage and offloading units (FPSO) deployment and is the home to approximately one-quarter of the world's operating FPSOs. This study shows that a typical FPSO operating in this region with a nameplate oil production capacity of 60,000 bbl/d may emit as much as 0.8 Mtpa CO2. Therefore, the aggregate of CO2 emission from FPSOs operating in West Africa can reach as much as 40 Mtpa. The urgent need to decarbonize FPSO operations will soon become a license-to-operate issue due to the world's aspiration to achieve net-zero around the middle of the century. This study further shows that in the context of West Africa, offshore wind energy is probably the most mature and impactful technology to decarbonize FPSO operations at a water depth less than 130 m. Current technology gaps include adaptation to low wind speeds, robust power cable design, design of on/off strategy to switch between deck boilers and wind turbines, and extension of floating substructures to water depth exceeding 130 m.
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Lau, Hon Chung, and Samir Piriyev. "Decarbonizing FPSO Operations in West Africa by Offshore Wind Energy." In Offshore Technology Conference. OTC, 2022. http://dx.doi.org/10.4043/31953-ms.

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Abstract The tropical waters of West Africa is a top growth region for floating, production, storage and offloading units (FPSO) deployment and is the home to approximately one-quarter of the world's operating FPSOs. This study shows that a typical FPSO operating in this region with a nameplate oil production capacity of 60,000 bbl/d may emit as much as 0.8 Mtpa CO2. Therefore, the aggregate of CO2 emission from FPSOs operating in West Africa can reach as much as 40 Mtpa. The urgent need to decarbonize FPSO operations will soon become a license-to-operate issue due to the world's aspiration to achieve net-zero around the middle of the century. This study further shows that in the context of West Africa, offshore wind energy is probably the most mature and impactful technology to decarbonize FPSO operations at a water depth less than 130 m. Current technology gaps include adaptation to low wind speeds, robust power cable design, design of on/off strategy to switch between deck boilers and wind turbines, and extension of floating substructures to water depth exceeding 130 m.
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Dianov, A., Kim Young-Kwan, Lee Sang-Joon, and Lee Sang-Taek. "Robust self-tuning MTPA algorithm for IPMSM drives." In IECON 2008 - 34th Annual Conference of IEEE Industrial Electronics Society. IEEE, 2008. http://dx.doi.org/10.1109/iecon.2008.4758151.

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Reports on the topic "MtProA"

1

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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