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He, Peng. "Process-structure-property relationships of yarns produced on the card-spinning system." Thesis, Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-06072004-131148/unrestricted/he%5Fpeng%5F200405%5Fms.pdf.
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Abrahams, Leon Gary. "Computerised speed monitoring system for nylon spinning." Thesis, Peninsula Technikon, 1996. http://hdl.handle.net/20.500.11838/1123.
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Thesis (MTech (Electrical Engineering))--Peninsula Technikon, Cape Town,1996The Southern Nylon Spinning plant, at South African Nylon Spinners in Bellville - Cape Town - South Africa, is one of the oldest on the site and a need arose to upgrade the existing method used in speed monitoring in this particular plant. This system was unable to produce alarms on speed limits being exceeded (i.e. on under-speed or over-speed). There was no alarm logging or historical trending. Manual records on speed were either incomplete or non-existent. Thus the purpose of this study was to investigate the existing speed monitoring system and implement a suitable computerised method of speed monitoring.
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Liu, Yi. "Mechanical and histochemical study on spider silk & spinning system." Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.445779.
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Hossain, Mahmud, Anwar Abdkader, Chokri Cherif, Maria Sparing, Dietmar Berger, Günter Fuchs, and Ludwig Schultz. "Innovative twisting mechanism based on superconducting technology in a ring-spinning system." Sage, 2014. https://tud.qucosa.de/id/qucosa%3A35397.
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Twist plays an important role to impart tensile strength in yarn during the spinning process. In the most widely used ring-spinning machine for short staple yarn production, a combination of ring and traveler is used for inserting twist and winding the yarn on cops. The main limitation of this twisting mechanism is the friction between the ring and traveler, which generates heat at higher speed and limits the productivity. This limitation can be overcome by the implementation of a magnetic bearing system based on superconducting technology, which replaces completely the existing ring/traveler system of the ring-spinning machine. This superconducting magnet bearing consists of a circular superconductor and permanent magnet ring. After cooling the superconductor below its transition temperature, the permanent magnet ring levitates and is free to rotate above the superconductor ring according to the principles of superconducting levitation and pinning. Thus the superconducting magnetic bearing (SMB) ensures a friction-free operation during spinning and allows one to increase spindle speed and productivity drastically. The yarn properties using the SMB system have also been investigated and they remain nearly identical to those of conventional ring yarns.
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Abuelenin, Sherif Mohamed Abdel-Hady Faissal. "Developing a magnetically suspended disc system for industrial applications, with application on ring spinning." Auburn, Ala., 2005. http://repo.lib.auburn.edu/Send%208-8-07/ABUELENIN_SHERIF_59.pdf.
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Paulson, Malin. "Testing and qualification of the boom system on the Spinning QUad Ionospheric Deployer." Thesis, KTH, Rymd- och plasmafysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-53612.
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At the department of Space and Plasma Physics a small wire boom system has been developed. The system’s cable is stored around a stationary cylinder. The system uses a gear to feed out the cable in an axial direction. The purpose is to measure the electric and magnetic fields in the ionosphere. The wire boom system has had problems with the functionality and friction. In the REXUS 10 project, the system concept was to be proven through a space flight. This Master’s Thesis describes the process of bringing the Boom system from concept to a fully functional and flight proven physical model. The results came in the form of a successful space flight, where two of the four systems deployed and retracted successfully. Another important result was the identification of and solution for, areas of the concept that are critical for its design, manufacturing and function.
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Muralidhar, Aditya. "Multiple-Input Multiple Output System on a Spinning Vehicle with Unknown Channel State Information." International Foundation for Telemetering, 2012. http://hdl.handle.net/10150/581828.
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This paper presents the investigations into the performance of a multiple-input multiple-output (MIMO) system with its transmitters on a spinning vehicle and no available channel state information (CSI) at the transmitter or the receiver. The linear least squares approach is used to estimate the channel and the estimation error is measured. Spinning gives rise to a periodic component in the channel which can be estimated based on the spin rate relative to the data rate of the system. It is also determined that spinning causes the bit error rate of the system to degrade by a few dB.
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Eskandar-Nejad, Safdar. "A study of fibre behaviour in the transfer zone of an open-end spinning system." Thesis, University of Manchester, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333580.
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Li, Li. "The asymptotic behavior for the Vlasov-Poisson-Boltzmann system & heliostat with spinning-elevation tracking mode /." access full-text access abstract and table of contents, 2009. http://libweb.cityu.edu.hk/cgi-bin/ezdb/thesis.pl?phd-ma-b30082419f.pdf.
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Thesis (Ph.D.)--City University of Hong Kong, 2009."Submitted to Department of Mathematics in partial fulfillment of the requirements for the degree of Doctor of Philosophy." Includes bibliographical references (leaves [84]-87)
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Mende, Howie. "Optical trapping, manipulation, translation and spinning of micron sized gears using a vertical dual laser diode system." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ61286.pdf.
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Wise, Evan Dale. "Design, analysis, and testing of a precision guidance, navigation, and control system for a dual-spinning Cubesat." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82509.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, June 2013.This thesis was scanned as part of an electronic thesis pilot project.
"May 2013." Cataloged from PDF version of thesis.
Includes bibliographical references (p. [81]-85).
The Microsized Microwave Atmospheric Satellite (MicroMAS) combines two traditional control approaches: a dual spinner and a three-axis gyrostat. Unlike typical dual spinners, the purpose of MicroMAS 's 2U bus and spinner assembly is to actuate a iu payload, not to add gyroscopic stiffness. An orthogonal triple reaction wheel assembly from Maryland Aerospace, Inc., will both counter the angular momentum from the payload and rotate the satellite's bus about its orbit-normal vector to maintain bus alignment with the orbital frame. The payload spins about the spacecraft velocity axis to scan successive swaths of the Earth. However, the CubeSat form factor restricts the velocity axis to be along the spacecraft minor axis of inertia. This orientation leaves the spacecraft at a gravity-gradient-unstable equilibrium. Further, imperfect cancellation of the payload's angular momentum induces nutation behavior. An extended Kalman filter is implemented on a 16-bit P1C24 microcontroller to combine gyroscope, limb sensor, and magnetometer data to provide attitude estimation accuracy of approximately 20 arcminutes. Simulations show that the reaction wheels can consistently maintain pointing to within 30 arcminutes for orbits above 400 kilometers with the payload rotating at 0.83 hertz.
by Evan Dale Wise.
S.M.
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Hossain, M., C. Telke, M. Sparing, A. Abdkader, A. Nocke, R. Unger, G. Fuchs, et al. "Mathematical modeling, simulation and validation of the dynamic yarn path in a superconducting magnet bearing (SMB) ring spinning system." Sage, 2017. https://tud.qucosa.de/id/qucosa%3A35492.
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The new concept of a superconducting magnetic bearing (SMB) system can be implemented as a twisting element instead of the existing one in a ring spinning machine, thus overcoming one of its main frictional limitations. In the SMB, a permanent magnet (PM) ring rotates freely above the superconducting ring due to the levitation forces. The revolution of the PM ring imparts twists similarly to the traveler in the existing twisting system. In this paper, the forces acting on the dynamic yarn path resulting from this new technology are investigated and described with a mathematical model. The equation of yarn movement between the delivery rollers and the PM ring is integrated with the Runge-Kutta method using MATLAB. Thus, the developed model can estimate the yarn tension and balloon form according to different spindle speeds considering the dynamic behavior of the permanent magnet of the SMB system. To validate the model, the important relevant process parameters, such as the yarn tension, are measured at different regions of the yarn path, and the balloon forms are recorded during spinning with the SMB system using a high speed camera.
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Miller, Ryan R. "A SYSTEM FOR MEASURING THE LIFT AND DRAG FORCES OF A SPINNING GOLF BALL HELD FIXED WITHIN A WIND TUNNEL." DigitalCommons@CalPoly, 2009. https://digitalcommons.calpoly.edu/theses/44.
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A system was designed, built and tested in order to test the aerodynamic properties of a standard golf ball in a wind tunnel manufactured by ELD, Inc. model 406(B). The system consists of a rotating shaft, on which the golf ball is attached, connected to a two-axis force transducer. Additionally, an automated data acquisition system was built for enhanced precision of measurements. Data for wind speeds up to 160 ft/s and rotational speeds up to 8,600 rpm were obtained and analyzed. The purpose of the designed apparatus was to allow for studies to better understand the lift and drag coefficients of golf balls during their flight. Subsequent to testing, it was found that the force transducer was not adequate to measure the lift and drag coefficients with sufficient accuracy. Several suggestions have been made on how to improve the wind tunnel so that better results might be obtained in the future.
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Kulkarni, Aditya. "Performance Analysis of Zero Forcing and Minimum Mean Square Error Equalizers on Multiple Input Multiple Output System on a Spinning Vehicle." International Foundation for Telemetering, 2014. http://hdl.handle.net/10150/577482.
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ITC/USA 2014 Conference Proceedings / The Fiftieth Annual International Telemetering Conference and Technical Exhibition / October 20-23, 2014 / Town and Country Resort & Convention Center, San Diego, CAChannel equalizers based on minimum mean square error (MMSE) and zero forcing (ZF) criteria have been formulated for a general scalable multiple input multiple output (MIMO) system and implemented for a 2x2 MIMO system with spatial multiplexing (SM) for Rayleigh channel associated with additive white Gaussian noise. A model to emulate transmitters and receivers on a spinning vehicle has been developed. A transceiver based on the BLAST architecture is developed in this work. A mathematical framework to explain the behavior of the ZF and MMSE equalizers is formulated. The performance of the equalizers has been validated for a case with one of the communication entities being a spinning aero vehicle. Performance analysis with respect to variation of angular separation between the antennas and relative antenna gain for each case is presented. Based on the simulation results a setup with optimal design parameters for placement of antennas, choice of the equalizers and transmit power is proposed.
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Cooley, Christopher Gary. "High-Speed Dynamics and Vibration of Planetary Gears, Vibration of Spinning Cantilevered Beams, and An Efficient Computational Method for Gear Dynamics." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1354558979.
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Bessho, Naoki. "Advanced pressure swing adsorption system with fiber sorbents for hydrogen recovery." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/42822.
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A new concept of a "fiber sorbent" has been investigated. The fiber sorbent is produced as a pseudo-monolithic material comprising polymer (cellulose acetate, CA) and zeolite (NaY) by applying hollow fiber spinning technology. Phase separation of the polymer solution provides an appropriately porous structure throughout the fiber matrix. In addition, the zeolite crystals are homogeneously dispersed in the polymer matrix with high loading. The zeolite is the main contributor to sorption capacity of the fiber sorbent. Mass transfer processes in the fiber sorbent module are analyzed for hydrogen recovery and compared with results for an equivalent size packed bed with identical diameter and length. The model indicates advantageous cases for application of fiber sorbent module over packed bed technology that allows system downsizing and energy saving by changing the outer and bore diameters to maintain or even reduce the pressure drop. The CA-NaY fiber sorbent was spun successfully with highly porous structure and high CO2 sorption capacity. The fiber sorbent enables the shell-side void space for thermal moderation to heat of adsorption, while this cannot be applied to the packed bed. The poly(vinyl alcohol) coated CA-NaY demonstrated the thermal moderation with paraffin wax, which was carefully selected and melt at slightly above operating temperature, in the shell-side in a rapidly cycled pressure swing adsorption. So this new approach is attractive for some hydrogen recovery applications as an alternative to traditional zeolite pellets.
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Hossain, Mahmud, Christian Telke, Anwar Abdkader, Chokri Cherif, and Michael Beitelschmidt. "Mathematical modeling of the dynamic yarn path depending on spindle speed in a ring spinning process." Sage, 2016. https://tud.qucosa.de/id/qucosa%3A35418.
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This paper presents a mathematical model to predict the distribution of yarn tension and the balloon shape as a function of spindle speed in the ring spinning process. The dynamic yarn path from the delivery rollers to the winding point on the cop has been described with a non-linear differential equation system. These equations have been integrated with a Runge–Kutta method using MATLAB software. Since the numerical solution of the equations strongly depends on initial values, an algorithm of sensitivity analysis has been developed to predict the right choice of initial values in order to find a stable solution. For model validation purposes, the yarn tension has been measured between delivery rollers and yarn guide. Furthermore, a high-speed camera has been used to capture the balloon shape at different spindle angular velocities in order to compare the theoretically determined balloon shape with the one that actually occurs on the machine.
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Shayesteh, Ebrahim. "Efficient Simulation Methods of Large Power Systems with High Penetration of Renewable Energy Resources : Theory and Applications." Doctoral thesis, KTH, Elektriska energisystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-158946.
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Electrical energy is one of the most common forms of energy these days. Consequently, electric power system is an indispensable part of any society. However, due to the deregulation of electricity markets and the growth in the share of power generation by uncontrollable renewable energies such as wind and solar, power system simulations are more challenging than earlier. Thus, new techniques for simplifying these simulations are needed. One important example of such simplification techniques is the power system reduction. Power system reduction can be used at least for four different purposes: a) Simplifying the power system simulations, b) Reducing the computational complexity, c) Compensating the data unavailability, and d) Reducing the existing uncertainty. Due to such reasons, power system reduction is an important and necessary subject, but a challenging task to do. Power system reduction is even more essential when system operators are facing very large-scale power systems and when the renewable energy resources like hydro, wind, and solar have a high share in power generation. This thesis focuses on the topic of large-scale power system reduction with high penetration of renewable energy resources and tries to pursue the following goals: • The thesis first reviews the different methods which can be used for simplifying the power system studies, including the power system reduction. A comparison among three important simplification techniques is also performed to reveal which simplification results in less error and more simulation time decrement. • Secondly, different steps and methods for power system reduction, including network aggregation and generation aggregation, are introduced, described and discussed. • Some improvements regarding the subject of power system reduction, i.e. on both network aggregation and generation aggregation, are developed. • Finally, power system reduction is applied to some power system problems and the results of these applications are evaluated. A general conclusion is that using power system simplification techniques and specially the system reduction can provides many important advantages in studying large-scale power systems with high share of renewable energy generations. In most of applications, not only the power system reduction highly reduces the complexity of the power system study under consideration, but it also results in small errors. Therefore, it can be used as an efficient method for dealing with current bulk power systems with huge amounts of renewable and distributed generations.The Doctoral Degrees issued upon completion of the programme are issued by Comillas Pontifical University, Delft University of Technology and KTH Royal Institute of Technology. The invested degrees are official in Spain, the Netherlands and Sweden, respectively. QC 20150116
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REI, ANDREA DE MATTOS. "METHODOLOGIES FOR POWER SYSTEMS SPINNING RESERVE EVALUATION." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1992. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=14191@1.
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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOREste trabalho trata das metodologias disponíveis mais utilizadas para a avaliação da reserva girante em sistemas de potência. São apresentadas abordagens determinísticas e probabilísticas. Uma grande variedade de aspectos são considerados e organizados de modo a se obter uma taxionomia metodológica. A aplicação da taxionomia sugerida é ilustrada com a análise de um sistema hipotético, o IEEE Reliability Test System, e do sistema brasileiro das regiões Sul/Sudeste/Centro-Oeste. Com base nos resultados obtidos com a aplicação de tal taxionomia à metodologia atualmente utilizada no Brasil, são apontados aspectos que necessitam de maiores pesquisas. Uma das principais conclusões obtidas revela que a prática atual de se associar os períodos críticos de risco àqueles de maior capacidade em manutenção não possui respaldo prático nem teórico.
This report reviews the most representative techniques currency available for power systems spinning reserve evaluation. Both deterministic and probabilistic approaches are tackled. A broad range of aspects are considered and organized in a practical methodological taxonomy. The application of the suggested taxonomy is illustrated with the aid of hypothetical systems, the IEEE Reliability Test System, and the Brazilian South/Southeast/Midwest System. Based on the diagnosis resulting from the application of the taxonomy to the methodology currently utilized in Brazil, several aspects in need of improvement are pointed out. As one of the main results attained, it shown that, the current practice of considering the critical risk period as coincident with the critical maintenance period, lacks practical evidence and theoretical support.
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Petersen, Samuel. "Multiple-Input Multiple-Output Systems for Spinning Vehicles." International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/605956.
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ITC/USA 2010 Conference Proceedings / The Forty-Sixth Annual International Telemetering Conference and Technical Exhibition / October 25-28, 2010 / Town and Country Resort & Convention Center, San Diego, CaliforniaThis paper investigates the performance of a multiple-input multiple-output (MIMO) digital communication system, when the transmitter is located on a spinning vehicle. In particular, a 2x2 MIMO system is used, with Alamouti coding at the transmitter. Both Rayleigh and Rayleigh plus line-of-sight, or Rician, models combined with a deterministic model to simulate the channel. The spinning of the transmitting vehicle, relative to the stationary receive antennas, modulates the signal, and complicates the decoding and channel parameter estimation processes. The simulated system bit error rate is the primary performance metric used. The Alamouti channel code is shown to perform better than the maximal ratio receiver combining (MRRC) and single receiver (2x1) system in some circumstances and performs similarly to the MRRC in the broadside case.
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Tyc, George. "Dynamics and stability of spinning flexible space tether systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0008/NQ32028.pdf.
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Berthold, Rico. "Strukturell komplexe intermetallische Verbindungen im System Al-Mg-Zn." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-155096.
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Die Elemente Al, Mg und Zn sind wichtige Komponenten für leichte und hochfeste Legierungen, wie die Al- oder Mg-Knetlegierungen. Darüber hinaus ist das Al-Mg-Zn-System sehr interessant, weil vier ternäre komplexe intermetallische Phasen, genannt τ1, τ2, Φ und q, darin vorkommen. Die aktuellen experimentellen Phasendiagramme des Al-Mg-Zn-Systems enthalten nur provisorische oder keine Homogenitätsbereiche der Φ-, τ2- und der q-Phase aufgrund unzureichender experimenteller Daten. Ziel der Arbeiten war es, die Homogenitätsbereiche der q-, τ2- und der Φ-Phase neu zu ermitteln und die Kristallstruktur der Φ-Phase zu bestimmen. Proben wurden durch Schmelzen und Wärmebehandlung in Ta-Ampullen oder durch Zentrifugieren aus der Schmelze hergestellt und durch XRD, SEM, EDXS, WDXS und DSC charakterisiert. Während der Neuuntersuchung der Al-Mg-Zn Phasengleichgewichte in der Nähe des Teilsystems Mg-Zn und nahe bei τ1 wurde eine Reihe von neuen ternären Phasen entdeckt. Die Kristallstrukturen für die Φ-Phase (Pbcm, a = 8,9374 (2) Å, b = 16,812 (3) Å, c = 19,586 (4) a) und drei der neuen intermetallischen Verbindungen wurden gelöst und die Kristallstruktur des τ2 Phase wurde erneut untersucht. Während τ2 (Pa-3, a = 23,034 (3) Å) ein Approximant der ikosaedrischen quasikristallinen Phase q ist, erwies sich eine der neuen Phasen (τd, Imm2, a = 5,2546 (2), b = 40,240 (2), c = 25,669 (1) Å) als dekagonaler Approximant. Überraschenderweise wurde eine Phase (Fd-3m, a = 27,5937 (9) Å) gefunden, die isotyp zu der binären Phase β-Al3Mg2 ist, aber eine Zn-reiche Zusammensetzung hatThe elements Al, Mg and Zn are major components for a large number of light and high strength alloys, such as the Al-based alloys of the 7xxx series. In addition, the Al-Mg-Zn system has attracted much interest because four complex metallic alloy phases, called τ1, τ2, Φ and q are formed as ternary intermetallic compounds. The current experimental phase diagrams of the Al-Mg-Zn system contain only provisional or no homogeneity ranges of the Φ phase, τ2 phase and the q phase due to insufficient experimental data. The aim of the work was to redetermine the homogeneity ranges of the q, τ2 and the Φ phases and to determine the crystal structure of the Φ phase for a reliable data set. Samples were prepared by furnace-controlled melting and annealing in Ta ampoules or by centrifugation from the self-flux and characterized by XRD, SEM, EDXS, WDXS and DSC. While reinvestigating the Al-Mg-Zn phase equilibria in the vicinity of the subsystem Mg-Zn close to τ1, a number of new ternary phases were discovered. Single phase material could be obtained for the known Φ and τ2 phases and for four new intermetallic compounds. The crystal structures for the Φ phase and two of the new intermetallic compounds were solved and the crystal structure of the τ2 phase was reinvestigated. While τ2 (Pa-3, a = 23.034(3) Å) is an approximant of the icosahedral quasicrystalline phase q, the Φ phase (Pbcm, a = 8.9374(2) Å, b = 16.812(3) Å, c = 19.586(4) Å) and one of the new phases (Imm2, a = 5.2546(2), b = 40.240(2), c = 25.669(1) Å) turned out to be decagonal approximants. Surprisingly, we have found one phase (Fd-3m, a = 27.5937 (9) Å) isotypic to the Samson’s phase β-Al3Mg2 at Zn rich composition
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Sutradhar, Nitai Chandra. "The study of ring-spinning with particular reference to rotating rings." Thesis, University of Leeds, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329210.
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Plaxton, John A. "Non-conservative dynamics of spinning beam systems with general boundary conditions." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/MQ32950.pdf.
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Gärdsback, Mattias. "Deployment Control of Spinning Space Webs and Membranes." Doctoral thesis, KTH, Strukturmekanik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9574.
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Future solar sail and solar power satellite missions require deployment of large and lightweight flexible structures in space. One option is to spin the assembly and use the centrifugal force for deployment, stiffening and stabilization. Some of the main advantages with spin deployment are that the significant forces are in the plane of rotation, a relatively simple control can be used and the tension in the membrane or web can be adjusted by the spin rate to meet the mission requirements. However, a successful deployment requires careful development of new control schemes. The deployment rate can be controlled by a torque, applied either to a satellite in the center or by thrusters in the corners, or by deployment rate control, obtained by tether, spool braking or folding properties. Analytical models with only three degrees of freedom were here used to model the deployment of webs and membranes for various folding patterns and control schemes, with focus on space webs folded in star-like arms coiled around a center hub. The model was used to investigate control requirements and folding patterns and to obtain optimal control laws for centrifugal deployment. New control laws were derived from the optimal control results and previously presented control strategies. Analytical and finite element simulations indicate that the here developed control laws yield less oscillations, and most likely more robustness, than existing controls. Rotation-free (RF) shell elements can be used to model inflation or centrifugal deployment of flexible memebrane structures by the finite element method. RF elements approximate the rotational degrees of freedom from the out-of-plane displacements of a patch of elements, and thus avoid common singularity problems for very thin shells. The performance of RF shell elements on unstructured grids is investigated in the last article of this thesis, and it is shown that a combination of existing RF elements performs well even for unstructured grids.QC 20100729
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Farooq, Assad. "Development of Prediction Systems Using Artificial Neural Networks for Intelligent Spinning Machines." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-37801.
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The optimization of the spinning process and adjustment of the machine settings involve “Trial and Error” method resulting in the wasting of production time and material. This situation becomes worse in the spinning mills where the speed and material changes are frequent. This research includes the use of artificial neural networks to provide the thinking ability to the spinning machines to improve the yarn spinning process. Draw frame, being the central part of the spinning preparation chain and last machine to rectify the variations in the fed slivers is the main focus of the research work. Artificial neural network have been applied to the leveling action point at auto-leveler draw frame and search range of leveling action point has been considerably reduced. Moreover, the sliver and yarn characteristics have been predicted on the basis of draw frame settings using the artificial neural networks. The results of present research work can help the spinning industry in the direction of limiting of “Trial and Error” method, reduction of waste and cutting down the time losses associated with the optimizing of machines. As a vision for the future research work the concept of intelligent spinning machines has also been proposedDie Optimierung des Spinnprozesses und die Maschineneinstellung erfolgen häufig mittels „Trial und Error“-Methoden, die mit einem hohen Aufwand an Produktionszeit und Material einhergehen. Diese Situation ist für Spinnereien, in denen häufige Wechsel des eingesetzten Materials oder der Produktionsgeschwindigkeit nötig sind, besonders ungünstig. Die vorliegende Arbeit zeigt das Potenzial Neuronaler Netze, um die Spinnmaschine zum „Denken“ zu befähigen und damit die Garnherstellung effektiver zu machen. Die Strecke ist der zentrale Teil der Spinnereivorbereitungskette und bietet die letzte Möglichkeit, Inhomogenitäten im Faserband zu beseitigen. Der Fokus der Arbeit richtet sich deshalb auf diese Maschine. Künstlich Neuronale Netze werden an der Strecke zur Bestimmung des Regeleinsatzpunktes genutzt, womit eine beträchtliche Reduzierung des Aufwands für die korrekte Festlegung des Regeleinsatzpunkts erreicht wird. Darüber hinaus können mit Hilfe der Neuronalen Netze die Band- und Garneigenschaften auf Basis der Streckeneinstellungen vorausbestimmt werden. Die Resultate der vorliegenden Arbeit machen „Trial und Error“-Methoden überflüssig, reduzieren den Ausschuss und verringern die Zeitverluste bei der Maschinenoptimierung. Als Zukunftsvision wird eine Konzeption für intelligente Spinnmaschinen vorgestellt
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McGillen, J. G. "Studies on the wet spinning of cellulose fibres from novel solvent systems." Thesis, University of Strathclyde, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372448.
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Vančura, Jakub. "Sportovní centrum." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227242.
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The aim of this master thesis is proposal of a sport center building. The proposal consists of design of a detached building with room for climbing gym, sauna, massage room and also space for fitness, spinning and yoga. A bar with area for relaxing is a part of the building as well. The sport center has two floors and no basement. Due to the climbing gym, the second floor does not cover all disposition of the second floor. The support system of the building is skeletal. Part of the building´s roof is supported by steel truss frames with purlins, another part with solid panel trusses with purlins. The cieling is made of holoribs and reinforced concrete. The building is covered by single layer roof and has ventilated facade.
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Repka, Michael Andrew. "Physical-mechanical and chemical properties of topical films produced by hot-melt extrusion /." Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.
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Gesta, Emmanuelle. "Study of the interaction and migration mechanisms in the systems polymer/insecticide." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1093.
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Le principal objectif des travaux présentés dans ce manuscrit était d’étudier certains paramètres régissant l’efficacité et la durabilité de moustiquaires avec des molécules insecticides incorporées dans les fils de polyéthylène. Pour cela deux axes de travail ont été identifiés : l’étude des phénomènes de migration des molécules insecticide dans les fils de polyéthylène et l’étude des mécanismes de photo-dégradation de l’insecticide étudié : la deltaméthrine.L’étude de l’influence du procédé de fabrication des moustiquaires sur la morphologie du polyéthylène a permis de montrer que l’étape d’étirage à froid était critique dans la définition des propriétés morphologiques (cristallinité et orientation de la structure cristalline) et mécaniques des fils. L’effet du recuit observé est plus modéré (légère augmentation de l’épaisseur des lamelles cristallines). Néanmoins, il a été montré que les modifications induites par le recuit sur la morphologie du polyéthylène ont une influence sur les phénomènes de migration des molécules insecticides dans les fils. En effet, alors qu’un retard est observé dans les courbes de désorption des fils non recuits, ce retard disparaît pour les fils recuits. Il a été également montré que la faible vitesse d’évaporation de la deltaméthrine permet de limiter la migration de la deltaméthrine hors des fils.L’étude de la photo-dégradation de la deltaméthrine a permis de mettre en évidence les principaux mécanismes de dégradation (isomérisation, scission de la fonction ester et de la fonction cyclopropane). L’ajout d’additifs de type antioxydants ou filtres UV permet de limiter la vitesse de dégradation de la deltaméthrineThe main objective of the works presented in this manuscript was to study some of the parameters ruling the efficacy and the durability of the mosquito nets with incorporated insecticide in the polyethylene yarns. To achieve this goal, two lines of research were identified: the study of the insecticide migration phenomena in the yarns and the study of the photodegradation mechanisms of the molecule of interest: the deltamethrin.The study of the influence of the nets fabrication process on the polyethylene morphology showed that the cold-drawing step was critical to define the morphological (crystallinity and orientation of the crystalline structure) and mechanical properties. The observed influence of the heat-setting appeared less important (slight increase of the crystalline lamellae thickness). However, the heat-setting induced modifications which affected the migration of the insecticide molecules in the yarns. Indeed, while a delay is observed in the desorption curves of the non-heat-set yarns, this time-lag disappeared in the heat-set yarns. It was also shown that the low evaporation rate of deltamethrin permits to impede the migration of deltamethrin out of the yarns.The study of the photodegradation of deltamethrin permitted to highlight the main degradation mechanisms (isomerization, ester cleavage and cyclopropane cleavage). Antioxidant and UV absorber additives can be used to reduce the deltamethrin degradation rate
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Riazi, Kamran [Verfasser], and M. [Akademischer Betreuer] Wilhelm. "Branched polystyrene model systems to investigate the rheology of polymer fiber spinning / Kamran Riazi ; Betreuer: M. Wilhelm." Karlsruhe : KIT-Bibliothek, 2018. http://d-nb.info/1162543973/34.
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Hollows, Judith Mary. "The cotton spinning industry within East Asian Business systems: firm development in Japan, South Korea, andHong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1995. http://hub.hku.hk/bib/B29900852.
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Hollows, Judith Mary. "The cotton spinning industry within East Asian Business systems : firm development in Japan, South Korea, and Hong Kong /." Hong Kong : University of Hong Kong, 1995. http://sunzi.lib.hku.hk/hkuto/record.jsp?B17491460.
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Ball, Sheila D. "Comparison of transient interfacial tension behaviours of oil/alkaline systems as measured by the drop volume and spinning drop tensiometers." Thesis, University of Ottawa (Canada), 1995. http://hdl.handle.net/10393/9791.
Full textAbstract:
The measurement of interfacial tension (IFT) as a function of time is useful for the study of reactions occurring at an interface. Reactions of particular importance occur in enhanced oil recovery (EOR) processes using alkaline flooding agents, in which injected alkaline solutions react with acidic oil trapped in the reservoir. In order to select the most effective alkaline agents available, an accurate method of measuring transient IFT is required. In this study, two methods of measuring the transient IFT have been examined. A relatively new method which uses an instrument called the drop volume tensiometer (DVT) has been studied. The results from this instrument have been compared to those obtained by the spinning drop tensiometer (SDT), which is the instrument most frequently used for studying transient IFT values. Interfacial tensions between oil and alkaline solutions were measured using the drop volume tensiometer and compared to those measured using the spinning drop tensiometer. The trend observed for the IFT as time progressed was surprisingly similar in both cases. However, the SDT values exhibited an increase in IFT after a minimum was reached whereas the DVT values did not generally exhibit this increase. The SDT appears to still be the preferred method for monitoring ultraflow IFT values (0.1 mN/m) as a function of time. However, it cannot be used to measure the IFT at the moment the oil droplet is created nor in the first 30 seconds once the two phases come into contact. In contrast, the DVT can only detect IFT at one discrete time. In addition, the DVT appeared to be able to measure IFT values below the manufacturer's stated lower limit of 0.2 mN/m, when employing highly viscous solutions, but was imprecise below this threshold level for solutions of lower viscosity. (Abstract shortened by UMI.)
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Kudla, Christian. "Strukturell komplexe intermetallische Phasen : Untersuchungen an binären und ternären Phasen der Systeme Ag-Mg und Ag-Ga-Mg." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1201041427278-30978.
Full textAbstract:
Im Rahmen der Dissertation wurden Komplexe Intermetallische Phasen (KIP) in den Systemen Ag-Mg und Ag-Ga-Mg dargestellt und charakterisiert. KIP sind Verbindungen, die sich grundlegend von einfachen Metallen unterscheiden. Große Elementarzellen, ein hierarchisch strukturierter Aufbau und inhärente Fehlordnung sind wesentliche Charakteristika. Empirisch wird zudem eine Häufung von strukturchemisch verwandten KIP (Ähnlichkeitsregel) in der Nähe von definierten Zusammensetzungen beobachtet (Häufungsregel). Obwohl nur wenig über die physikalischen Eigenschaften dieser Verbindungsklasse bekannt ist, zeigen neueste Untersuchungen, dass sie interessante Eigenschaften wie ungewöhnliches plastisches Verhalten und Pseudo-Bandlücken in der elektronischen Zustandsdichte in Höhe der Fermi-Energie aufweisen können. Diese Arbeit zeigt exemplarisch, dass in der Chemie der KIP durchaus einfache Regeln (Häufungs-, Ähnlichkeits-, Valenzelektronenkonzentrationsregel) genutzt werden können, um neue Verbindungen mit vorgegebenen geometrischen Baueinheiten aufzufinden. Vereinfachende Annahmen, wie die Aussage, dass zweikomponentige Mackay-Cluster keine Fehlordnung aufweisen oder dass ein Mackay-Cluster maximal 92 Valenzelektronen enthält, erwiesen sich hingegen als falsch. Die Untersuchungen haben gezeigt, dass eine Kombination verschiedener Synthesemethoden notwendig ist. Insbesondere hat sich das Schmelzspinnverfahren, das zur Darstellung kristalliner magnesiumreicher Legierungen angewandt und modifiziert wurde, bei der phasenreinen Synthese der Verbindungen bewährt. Die Entwicklung von Spritzdüsen aus Tantal ermöglichte die kontaminationsfreie Verarbeitung der Mg-haltigen Legierungen. Die Bestimmung der Kristallstrukturen inklusive der Fehlordnungsphänomene war für das Verständnis der Stabilität der KIP entscheidend. Da häufig zwischen verschiedenen Modellen zur Beschreibung der Fehlordnung entschieden werden musste, waren neben präzisen Beugungsdaten genaue Untersuchungen der Präparate mittels chemischer Analytik, Metallographie und WDX hinsichtlich der Zusammensetzung aller Phasen erforderlich. Der magnesiumreiche Teil des binären Phasendiagramms Ag-Mg wurde neu bestimmt. Dabei wurden zwei bislang unbekannte Phasen dargestellt. Die fünf magnesiumreichen Phasen kristallisieren innerhalb eines schmalen Bereichs von nur 9 At.-% Mg. Die Kristallstrukturen dieser Phasen wurden unter besonderer Berücksichtigung der Fehlordnungsphänomene untersucht. Die Verbindungen sind strukturchemisch verwandt und lassen sich den I3-Cluster-Phasen zuordnen. Ag2Mg5 kristallisiert ohne Fehlordnung im Al5Co2-Typ. Die Kristallstrukturen von Ag7Mg26 und Ag17Mg54 lassen sich als fcc bzw. bcc Anordnungen von Mackay-Clustern beschreiben. Es handelt sich um die ersten bekannten binären Phasen, in denen innerhalb von isolierten Mackay-Clustern Substitutionsfehlordnung auftritt. AgMg4 kristallisiert hexagonal in einem eigenen Strukturtyp. Das I3-Cluster-Netzwerk füllt den gesamten Raum bis auf einen annähernd zylindrischen Bereich um 0, 0, z, in dem eine Atom-Split-Position aus drei Lagen vorliegt. Lokal liegen drei unterschiedliche Koordinationspolyeder vor, deren Stapelabfolge in der Kristallstruktur von AgMg4 zufällig ist, jedoch mit kurzreichweitiger Korrelation. Es konnte gezeigt werden, dass sich AgMg4 in eine Tieftemperaturphase umwandelt, in der die Polyeder vermutlich langreichweitig unter Bildung einer Überstruktur ordnen. Der Phasenbestand des ternären Systems Ag-Ga-Mg wurde untersucht und die Kristallstrukturen von sechs neuen Phasen bestimmt. Des weitern wurde eine Verbindung im System Ga-Mg-Pd charakterisiert. Anhand der Strukturtypen Al3Ir und Cu3P sowie den Verbindungen Ag0,55Ga0,45Mg3, Ga4,62Mg13,38Pd7 und Ag1,31Ga1,89Mg7,80 wurde gezeigt, wie die Variation von Strukturmotiven durch geringe Abweichungen von idealer Symmetrie zu zunehmend komplexeren Kristallstrukturen führt, die sich stets von Packungen des Edshammarpolyeders ableiten lassen. Drei ternäre Phasen vom I3-Cluster-Typ konnten identifiziert werden: Neben ternären Varianten der Phasen Ag7Mg26 und Ag17Mg54 kristallisiert Ag0,59Ga0,41Mg2 metastabil im NiTi2-Typ. In den strukturchemisch verwandten Phasen Ag6Ga12Mg11 und Ag21Ga74Mg44 bilden die Mg Atome Netzwerke mit Clatrath-II- bzw. Clatrath-IV-Topologie, die mit Ikosaedern und Frank-Kasper-Polyedern aus Ag und Ga gefüllt sind. Diese Phasen werden wahrscheinlich durch das e/a-Verhältnis der gesamten Struktur im Sinne einer Hume-Rothery-Regel stabilisiert.
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Kudla, Christian. "Strukturell komplexe intermetallische Phasen : Untersuchungen an binären und ternären Phasen der Systeme Ag-Mg und Ag-Ga-Mg." Doctoral thesis, Technische Universität Dresden, 2007. https://tud.qucosa.de/id/qucosa%3A24048.
Full textAbstract:
Im Rahmen der Dissertation wurden Komplexe Intermetallische Phasen (KIP) in den Systemen Ag-Mg und Ag-Ga-Mg dargestellt und charakterisiert. KIP sind Verbindungen, die sich grundlegend von einfachen Metallen unterscheiden. Große Elementarzellen, ein hierarchisch strukturierter Aufbau und inhärente Fehlordnung sind wesentliche Charakteristika. Empirisch wird zudem eine Häufung von strukturchemisch verwandten KIP (Ähnlichkeitsregel) in der Nähe von definierten Zusammensetzungen beobachtet (Häufungsregel). Obwohl nur wenig über die physikalischen Eigenschaften dieser Verbindungsklasse bekannt ist, zeigen neueste Untersuchungen, dass sie interessante Eigenschaften wie ungewöhnliches plastisches Verhalten und Pseudo-Bandlücken in der elektronischen Zustandsdichte in Höhe der Fermi-Energie aufweisen können. Diese Arbeit zeigt exemplarisch, dass in der Chemie der KIP durchaus einfache Regeln (Häufungs-, Ähnlichkeits-, Valenzelektronenkonzentrationsregel) genutzt werden können, um neue Verbindungen mit vorgegebenen geometrischen Baueinheiten aufzufinden. Vereinfachende Annahmen, wie die Aussage, dass zweikomponentige Mackay-Cluster keine Fehlordnung aufweisen oder dass ein Mackay-Cluster maximal 92 Valenzelektronen enthält, erwiesen sich hingegen als falsch. Die Untersuchungen haben gezeigt, dass eine Kombination verschiedener Synthesemethoden notwendig ist. Insbesondere hat sich das Schmelzspinnverfahren, das zur Darstellung kristalliner magnesiumreicher Legierungen angewandt und modifiziert wurde, bei der phasenreinen Synthese der Verbindungen bewährt. Die Entwicklung von Spritzdüsen aus Tantal ermöglichte die kontaminationsfreie Verarbeitung der Mg-haltigen Legierungen. Die Bestimmung der Kristallstrukturen inklusive der Fehlordnungsphänomene war für das Verständnis der Stabilität der KIP entscheidend. Da häufig zwischen verschiedenen Modellen zur Beschreibung der Fehlordnung entschieden werden musste, waren neben präzisen Beugungsdaten genaue Untersuchungen der Präparate mittels chemischer Analytik, Metallographie und WDX hinsichtlich der Zusammensetzung aller Phasen erforderlich. Der magnesiumreiche Teil des binären Phasendiagramms Ag-Mg wurde neu bestimmt. Dabei wurden zwei bislang unbekannte Phasen dargestellt. Die fünf magnesiumreichen Phasen kristallisieren innerhalb eines schmalen Bereichs von nur 9 At.-% Mg. Die Kristallstrukturen dieser Phasen wurden unter besonderer Berücksichtigung der Fehlordnungsphänomene untersucht. Die Verbindungen sind strukturchemisch verwandt und lassen sich den I3-Cluster-Phasen zuordnen. Ag2Mg5 kristallisiert ohne Fehlordnung im Al5Co2-Typ. Die Kristallstrukturen von Ag7Mg26 und Ag17Mg54 lassen sich als fcc bzw. bcc Anordnungen von Mackay-Clustern beschreiben. Es handelt sich um die ersten bekannten binären Phasen, in denen innerhalb von isolierten Mackay-Clustern Substitutionsfehlordnung auftritt. AgMg4 kristallisiert hexagonal in einem eigenen Strukturtyp. Das I3-Cluster-Netzwerk füllt den gesamten Raum bis auf einen annähernd zylindrischen Bereich um 0, 0, z, in dem eine Atom-Split-Position aus drei Lagen vorliegt. Lokal liegen drei unterschiedliche Koordinationspolyeder vor, deren Stapelabfolge in der Kristallstruktur von AgMg4 zufällig ist, jedoch mit kurzreichweitiger Korrelation. Es konnte gezeigt werden, dass sich AgMg4 in eine Tieftemperaturphase umwandelt, in der die Polyeder vermutlich langreichweitig unter Bildung einer Überstruktur ordnen. Der Phasenbestand des ternären Systems Ag-Ga-Mg wurde untersucht und die Kristallstrukturen von sechs neuen Phasen bestimmt. Des weitern wurde eine Verbindung im System Ga-Mg-Pd charakterisiert. Anhand der Strukturtypen Al3Ir und Cu3P sowie den Verbindungen Ag0,55Ga0,45Mg3, Ga4,62Mg13,38Pd7 und Ag1,31Ga1,89Mg7,80 wurde gezeigt, wie die Variation von Strukturmotiven durch geringe Abweichungen von idealer Symmetrie zu zunehmend komplexeren Kristallstrukturen führt, die sich stets von Packungen des Edshammarpolyeders ableiten lassen. Drei ternäre Phasen vom I3-Cluster-Typ konnten identifiziert werden: Neben ternären Varianten der Phasen Ag7Mg26 und Ag17Mg54 kristallisiert Ag0,59Ga0,41Mg2 metastabil im NiTi2-Typ. In den strukturchemisch verwandten Phasen Ag6Ga12Mg11 und Ag21Ga74Mg44 bilden die Mg Atome Netzwerke mit Clatrath-II- bzw. Clatrath-IV-Topologie, die mit Ikosaedern und Frank-Kasper-Polyedern aus Ag und Ga gefüllt sind. Diese Phasen werden wahrscheinlich durch das e/a-Verhältnis der gesamten Struktur im Sinne einer Hume-Rothery-Regel stabilisiert.
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Sousa, Thales. "Valoração do fornecimento de serviços ancilares a partir de usinas hidroelétricas." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-07122006-144442/.
Full textAbstract:
O presente trabalho propõe o desenvolvimento de uma metodologia de valoração da reserva de potência ativa e do suporte de potência reativa a partir de plantas hidroelétricas. Inicialmente foi apresentado um histórico que descreveu o que foi definido e regulamentado sobre estes serviços em diferentes mercados de energia. Em seguida, com o objetivo de valorar o serviço de reserva de potência ativa foi realizada a mensuração da perda de eficiência, resultante do fornecimento deste serviço, que após convertida em MWh foi relacionada à perda de oportunidade, caso essa energia fosse comercializada no mercado de energia. Para a valoração do suporte de potência reativa foi utilizada a teoria de Fluxo de Potência Ótimo com objetivo de minimizar as perdas do sistema e relacionar essa minimização à redução do suporte de potência reativa. Em seguida, foi apresentada uma metodologia de valoração e alocação dos custos do suporte de potência reativa entre as barras responsáveis pela necessidade adicional deste suporte. Foram realizados vários testes para validação e verificação das metodologias propostas.The present study proposes valuation methodologies for the spinning reserve and for the reactive power support regarding hydroelectric plants. Initially, a revision describing what was defined and regulated on these services in different energy markets is presented. In order to valuate the spinning reserve service, the measurement of efficiency losses stemming from this service supply was done. Thereafter, the efficiency losses were converted into MWh and related to the opportunity loss, in case this energy was commercialized in the energy market. As for the reactive power support valuation, the Optimal Power Flow was used. The objective was to minimize the system losses and relate such a minimization to the reactive power support. Subsequently, methodologies for the reactive power support costs and for the cost allocation among the responsible buses for additional requirement of this support are also presented. Various tests to validate and verify the above mentioned methodologies were carried out.
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Barbet-Massin, Emeline. "Structure of bio-macromolecular complexes by solid-state Nuclear Magnetic Resonance." Thesis, Lyon, École normale supérieure, 2013. http://www.theses.fr/2013ENSL0811.
Full textAbstract:
La RMN du solide a récemment émergé en tant que technique très puissante en biologie structurale, permettant de caractériser au niveau atomique des systèmes qui ne peuvent être étudiés par d’autres méthodes. Des protocoles spécifiques à la RMN du solide sont à présent bien établis pour la préparation des échantillons, l’attribution des spectres et l’acquisition de contraintes structurales. Ensemble, ces protocoles ont ouvert la voie aux premières déterminations de structures tridimensionnelles de molécules biologiques à l’état solide avec une résolution atomique, et ce non seulement pour des échantillons protéiques microcristallins, mais également pour des systèmes plus complexes tels que des fibrilles ou des protéines membranaires.La détermination structurale de tels systèmes est cependant encore loin d’être une routine, et des avancées de plus large ampleur sont attendues grâce à des développements aux niveaux méthodologique et matériel. Pour cette raison, une majeure partie du travail présenté dans cette thèse a été consacrée au développement d’expériences à la fois nouvelles et sophistiquées pour améliorer la sensibilité et la résolution des méthodes déjà existantes pour attribuer les spectres et élargir les possibilités offertes par la RMN du solide en vue d’étudier la structure de systèmes protéiques plus larges. Ces développements reposent notamment sur l’utilisation de champs magnétiques très intenses et sur la rotation des échantillons à l’angle magique dans la gamme des très hautes vitesses angulaires. Nous montrons que dans ce cadre, il est possible de concevoir des expériences utilisant uniquement des champs radiofréquences à faible puissance ainsi que d’utiliser des transferts sélectifs, l’acquisition de corrélations à travers les liaisons chimiques et la détection proton.En particulier, nous montrons que des expériences de corrélation homonucléaire reposant sur des transferts scalaires deviennent une alternative compétitive aux expériences basées sur des transferts dipolaires. Deux nouvelles séquences d’impulsion permettant de détecter des corrélations 13C-13C à travers les liaisons chimiques avec une excellente résolution sont présentées; couplées à des transferts 15N-13C, elles permettent l’attribution des résonances de la chaîne principale des protéines avec une grande sensibilité.De plus, nous démontrons qu’il est possible d’obtenir des raies très fines pour les résonances de protons dans des protéines complètement protonées à l’état solide grâce à la rotation à l’angle magique à ultra-haute vitesse, sans avoir recours à la deutération. Dans ce contexte, nous avons développé de nouvelles stratégies permettant d’attribuer rapidement et de façon fiable les résonances des spins 1H, 15N, 13CO, 13CA et 13CB dans différentes classes de protéines, ainsi que pour mesurer des contraintes structurales à partir des distances entre protons. L’approche proposée repose sur la haute sensibilité des protons et accélère donc considérablement les processus d’attribution et de détermination structurale des protéines à l’état solide, comme illustré sur la protéine beta-2-microglobuline.Enfin, nous avons appliqué cette nouvelle approche pour réaliser l’attribution et l’étude structurale et fonctionnelle de trois catégories de complexes protéiques: les fibrilles amyloidogènes formées par beta-2-microglobuline, les nucléocapsides du virus de la rougeole, et les nucléocapsides d’Acinetobacter phage205. Nous avons également utilisé la technique de Polarisation Nucléaire Dynamique pour obtenir des informations sur l’ARN des nucléocapsides du virus de la rougeole.Nous considérons que les résultats présentés dans cette thèse représentent une avancée substantielle dans le domaine de la RMN du solide appliquée à la biologie structurale. Grâce aux progrès actuels dans ce domaine, l’impact de la RMN biomoléculaire à l’état solide promet d’augmenter dans les prochaines annéesSolid-state NMR has recently emerged as a key technique in modern structural biology, by providing information at atomic level for the characterization of a wide range of systems that cannot be investigated by other atomic-scale methods. There are now well established protocols for sample preparation, resonance assignment and collection of structural restraints, that have paved the way to the first three-dimensional structure determinations at atomic resolution of biomolecules in the solid state, from microcrystalline samples to fibrils and membrane-associated systems. These determinations are however still far from being routine, and larger breakthroughs are expected with further methodological and hardware developments. Accordingly, most of the work presented in this thesis consists of the development of new, sophisticated NMR experiments to improve the sensitivity and resolution of the currently existing schemes for resonance assignment and to extend the capabilities of solid-state NMR in terms of structural investigation of proteins for the analysis of large substrates. These developments notably rely on the use of very high magnetic fields and ultra-fast magic-angle spinning (MAS). We show the great potential of this particular regime, which enables the use of low-power experiments and the acquisition of selective cross-polarization transfers, through-bond correlations and 1H-detected correlations.In particular, we show that homonuclear correlation experiments based on through-bond transfers become competitive alternatives to dipolar transfer schemes. Two new pulse sequences that detect sensitive and resolved 13C-13C through-bond correlations are introduced, which coupled to 15N-13C dipolar transfer steps provide sensitive routes for protein backbone resonance assignment.Furthermore, we demonstrate that narrow 1H NMR line widths can be obtained for fully protonated proteins in the solid state under ultra-fast MAS, even without perdeuteration. In this context, we have developed new strategies for extensive, robust and expeditious assignments of the 1H, 15N, 13CO, 13CA and 13CB resonances of proteins in different aggregation states, and new schemes for the measurements of site-specific 1H-1H distance restraints. This approach relying on the very high sensitivity of 1H spins remarkably accelerates the processes of assignment and structure determination of proteins in the solid state, as shown by the assignment and de novo structure determination of native beta-2-microglobulin. Finally, we apply this new approach to perform resonance assignment and to study structural and dynamic features of three complex protein aggregates: amyloid fibrils formed by native and D76N beta-2-microglobulin, Acinetobacter phage 205 nucleocapsids and measles virus (MeV) nucleocapsids. We also used Dynamic Nuclear Polarization to obtain the first information about RNA in MeV nucleocapsids.We believe that the results presented in this thesis represent a substantial step forward for solid-state NMR in structural biology. With all the current advances in the field, the impact of biomolecular solid-state NMR is likely to increase in the next years
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Fang, Hong-Ren, and 方苰任. "Blended Control System Design for Spinning Missiles." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/mqrbqc.
Full textAbstract:
碩士國立交通大學
電控工程研究所
104
This thesis investigates a blended controller design method for spinning missile interceptors, which includes two actuators, the tail fins and lateral thrust. The tail fin controller provides tracking of acceleration command in a general engagement situation. The lateral thrust controller is used to enhance tracking performance which may be inadequate with tail fin acting alone. The required lateral thrust is supplied using 180 micro thrusters placed in circular ring, around the front section of the interceptor. In order to make use of the micro thrusters more efficiently, the interceptor controlled to spin at a fixed rate. In general engagement, slow ranging acceleration commands in inertial coordinate induce periodic component in body coordinate. We design a linear decoupling controller by linear dynamics of spinning missile. Besides reaching the demand of transient response, we add the internal model for tracking of sinusoidal periodic command perfectly in steady state. The lateral thrust designed using sliding mode control theory is nonlinear and provides fast and robust system response. A firing logic algorithm which takes into account accuracy and propellant usage is proposed and compared with several algorithms in the literature. Simulation results show that the designed blended controller give satisfactory performance in a hit-to-kill scenario.
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Chen, Chang-Chi, and 陳昶吉. "Spinning Music Recommendation System Based on Neural Network." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/6fv625.
Full textAbstract:
碩士國立屏東科技大學
資訊管理系所
104
In recent years, more and more people have gradually paid their attention to health, many people will keep the health condition by doing exercise such as running, swimming, cycling. Spinning is aerobic/anaerobic exercise, which gradually rose in recent years. The sport is different from preceding several sports, it needs professional coaches and music. They lead students in 30-60 minutes for courses. Some spinner companies have sold spinner with teaching videos but someone feel boring about same teaching videos. In the light of this, our study use Mel frequency cepstral analysis courses music, then we use of neural networks to classify of supervised learning. After that, we verify this method is applicable to spinning courses music classification. Finally, the experimental results showed that the total correct classification rate 71.1%. The effect is not very remarkable.
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Wen, Chen-Kang, and 聞承剛. "Spinning Music Classification System Based on Deep Learning." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/2ad9qv.
Full textAbstract:
碩士國立屏東科技大學
資訊管理系所
105
In recent years, people pay more and more attention on health. People keep exercising to maintain health. Spinning is one kind of aerobic exercises and anaerobic exercises and it is getting popular gradually. Spinning needs a professional trainer to lead trainees and each course with music lasts for about 30 minutes to 60 minutes. Although a lot of professional training videos are offered, users are not attracted by those videos after them for multiple times, even lose sporting effect. Due to this aim, this research analyzes the course music of Mel Frequency Cepstral Coefficents (MFCC) for music features. Next, we extract MFCC average, standard deviation, maximum value, minimum value as the base feature. We use Deep Belief Network (DBN) simulates the way how spinning trainers classify the music and also verifies whether this method is suitable for Spinning music classification. Finally, the experimental results show that only the personal spinning music classification system can be realized, and the total correct classification rate can reach 80%.
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Maitra, Ananyo. "Crawling, Waving, Spinning : Activity Matters." Thesis, 2014. http://hdl.handle.net/2005/2910.
Full textAbstract:
This thesis has been concerned with a few problems in systems driven at the scale of particles. The problems dealt with here can be extended and elaborated upon in a variety of ways. In 2 we examine the dynamics of a fluid membrane in contact with a fluid containing active particles. In particular, we show that such a membrane generically enters a statistical steady state with wave-like dispersion. While the numerical results are satisfying, a one-step coarse-graining calculation, in line with [66,93], will, we expect, yield a pair of coupled stochastic differential equations (probably KPZ like at least in one dimension) with wave-like dispersion. This calculation in of interest from a theoretical point-of-view. Further, the numerical exploration of the full set of equations is also left for future work, but can be relevant to many biological systems.
In 3 we show that an active fluid confined in an annular channel starts to rotate spontaneously. Further, we predict the existence of banded concentration profile. Such profiles have not yet been observed in experiments. Further, it will be interesting to study what happens to our conclusions if we include the effect of treadmilling in our calculation.
In 4 we describe a solid driven by active particles. Specifically, we only concern ourselves with the polar elastomeric phase of the material. However, the questions regarding the transition into that phase are interesting and have not been explored. How exactly does a polarisation transition happen in an active polar elastomer? Is it the same as in an active nematic elastomer? What is the nature of the gelation transition in an active polar fluid? What is the dynamics of nematic defects in an elastomer? Can the presence of the elastomer prevent defect separation? We are at present trying to answer these questions.
In 5 we examine the dynamics of an active fluid confined in a channel. It will be interesting to test the prediction about fluctuations in a confined active system, which we show will be normal, in experiments on highly confined actomyosin systems.
In 6 we write down the coupled equations of a conformation tensor and the apolar order parameter. This is a generic framework for studying viscoelastic active fluids. A fuller study of the effect of increasing the cross-linker density in such system remains to be done, both theoretically and experimentally.
In general, we have shown in the thesis that the understanding of active systems can provide a mechanistic explanation of various biological observations. However, at times the comparison between theory and biological experiments become complicated due to the inherently complicated nature of the experimental systems. Thus, for a more rigorous experimental test of the theory, it is necessary to construct cleaner reconstituted systems with possibly as few as three components. Efforts in this direction have recently borne fruit [129]. However, a complete theoretical understanding of the rich behaviour evinced in these systems is as yet lacking. We expect that the conformation tensor theory we developed in chapter 6 will provide an explanation for the anomalous rheological behaviour observed in these systems.
Even in the theoretical front, lot of questions remain to be answered. The dry polar active system, described by the Toner-Tu equations have been shown to undergo a transition to a state with LRO. However, though mean-field theory predicts a second order transition [151, 152, 156], detailed numerical analysis suggests that it is actually first-order with pre-transitional solitonic bands. This has been recently examined by Chate et al. [26] who mapped it to a dynamical system, but a complete theory is still lacking.
Apolar systems present another set of challenges. First, the concentration coupling with the order parameter should create similar pre-transitional effects at the order-disorder transition for this system also. This has been studied to a certain extent [133]. However, the more interesting question concerns the role of defects in apolar systems and whether they allow for the possibility of even QLRO in two dimensions. The +1/2 nematic defect has a polarity, and can thus move balistically [51, 108, 115, 149] in a dry system. However, the −1/2 defect has a three-fold symmetry [27] and its motion is thus purely diffusive. Now consider a pair of +1/2 and −1/2 defect pair that can form due to noise in the system (since it does not violate charge conservation). Depending on the configuration and the kind of activity, this defect pair can unbind at zero temperature. Unbound defects would imply that the order is short-ranged. However, it appears from detailed simulations of an agent based Vicsek-like model of active nematics, that there exists a QLRO nematic in two dimensions [111]! How does an active nematic escape being destroyed by defect unbinding? Does concentration have a major role to play? If so, does making the concentration a non-conserved, and thus fast, variable by, for example, including evaporation-deposition rules in the model studied by Chate et al. [28] destroy the QLRO? Also, does the hydrodynamic theory for Malthusian (i.e. one in which the concentration relaxes fast to a steady value) nematics show only short-ranged order, while the one in which mass is conserved show QLRO? These questions are being studied at present by simulating both the agent-based model due to Chate with evaporation-deposition and the dynamical equation for the active nematic order-parameter. These studies should clarify the role of concentration in assisting apolar order.
It must be borne in mind, however, that numerical simulations of active models are more difficult than their passive counterparts due to the larger number of parameters present in the problem. In passive systems Onsager symmetry relations constrain some parameters. However, the absence of an equivalent rule for systems far away from equilibrium implies that the spatial symmetry allowed couplings will all have independent kinetic coefficients. This increases the size of the parameter space in many problems.
Also, many techniques like Monte Carlo have to be carefully modified to suit such systems.
A new and exciting area of research from the point of view of statistical mechanics of active systems is an examination of collective behaviour of run-and-tumble particles pioneered by Tailleur and Cates [25]. This has led to fruitful active generalisations of models of dynamic critical phenomena like model B and model H. Also, it has led to an exploration of rules for selecting a state in a region of phase coexistence – an out of equilibrium generalisation of the Maxwell construction.
Another interesting avenue is building up active matter equations from microscopics. This has been done for Vicsek model by Thomas Ihle [64,65], for a simple generalisation of Vicsek-type model for both polar and apolar alignment interactions by Bertin et al. and Chate et al. [15, 16, 107], and for a model of hard rods by Marchetti et al. [10, 11]. The issues of closure still remain to be fully resolved however in deriving the macroscopic equations.
A particularly exciting new system that has been recently studied extensively is a collection of chemotactic Janus particles [127]. The far-field interaction in this case does not promote polar order but state with proliferation of asters. The coarse-grained hydrodynamic equations have been derived in this case starting from a microscopic picture of colloids coated axisymetrically with a catalyst in an inhomogeneous concentration of reactants by Saha et al. [127].
Another theoretical issue that plagues the derivation of hydrodynamic equations is that of noise. So far most theories have modelled the noise as Gaussian and white, akin to equilibrium systems, but with unknown strength. However, it is likely that the noise also depends on activity, thus requiring a microscopic picture treating the active forces as stochastic quantities. It is known that multiplicative character of the noise induces interesting features at least in the case of active nematics [104].
Thus, a lot of questions need to be answered if theories of active matter have to graduate from merely offering qualitative explanations of biological experiments to becoming the prototypical theory of systems in which energy input and dissipation both occur at
a scale smaller than the coarse-graining volume.
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Lin, Cheng-Hsien, and 林承賢. "A study of the carousel storage system for spinning mill." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/84773501428112436521.
Full textAbstract:
碩士元智大學
工業工程與管理學系
91
Today , the designer of an automatic handling system which usually from the point of view of the mechanical engineering instead of the Industrial Engineering. That is why the system does not integrate well enough. To prevent from mechanical fatigue and inefficiency. As a result the system is easy to breakdown. For spinning mill from the point of view of Industrial Engineering we describe a problem of storing and picking products in carousel storage. We also investigate the system performance of the automatic handling system in spinning mill before and after the attach ment of the kernel of carousels In this study, we proposed five different design and compare the total distance and the computer’s operation time for each design. Design 1:Random load, the nearest heuristic method. Design 2:Concentrate on the same manufactures in one block for each carousel, use the nearest heuristic method. Design 3:Concentrate on the same manufactures in one block similar to design 2 but only for one carousel, use the nearest heuristic method. Design 4:Concentrate on the same manufactures in two blocks and face to face for each carousel , use the nearest heuristic method. Design 5:Concentrate on the same manufactures in two blocks and face to face similar to design 4 but only for one carousel, use the nearest heuristic method.
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Jing-Pai, Lee, and 李璟沛. "Active Boundary and Parametric Controls of a Spinning Beam System." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/64978780351905154834.
Full textAbstract:
碩士中原大學
機械工程研究所
86
This paper presents the active vibration control of spinning beam. Partial differential equations (PDE's) are referred to a distributed parameter system and selected as the object to be controlled. The equations of motion for the nonlinear physical model of Euler beam are obtained by using the Hamilton principle. The axial effects of elastic deformation are introduced to the transversal governing equations, then the linear physical model of simple-flexure beam are achieved. The concept of control is implemented by applying a variation of axially external force to suppress the transverse vibration of the system. The Lyapunov method with total and equivalent energy and concept of sliding mode are applied to a distributed control source for resolving the problem which ensures a convergence of the given space distributed control magnitude in the PDE's. Active boundary and parametric control are used to obtain the controller for the modified time-dependent parameters in the Euler and simple-flexure beam system. The discontinuous switching logic in the control law is allowed to change the structure of the controlled plant and improves its stability and transient responses. Asymptotic and exponential stability of the controlled system is proved for the credibility of the derived control input by proposing serious mathematical deductions. The subsequent problems of chattering and unbounded control force are also discussed and feasible alternatives are addressed. The saturation and piecewise-zero control are applied to obviate the unbounded control input, and the smooth control is used to erase the chattering motion. The finite difference method is chosen to simulatethe controlled responses in numerical analysis. The numerical and theoretical results can be checked about coincidence between these different methods of analysis.
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Zi-Xuan, Zeng, and 曾子軒. "Development and Analysis of Team Competition System for Spinning Course." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/6fs8x7.
Full textAbstract:
碩士國立屏東科技大學
資訊管理系所
106
The research is the combination of spinning course and team competition. Analysis of differences between the spinning course and team competition system for spinning course. This experiment collected the exercise data with wearable technology from students of spinning course and spinning course with team competition system. Analysis of students' subjective feelings about the course by questionnaire The result showed, the team competition system for spinning course is helpful for students in spinning course to increase their heart rate and achieve different sports purposes. The team competition system for spinning course is interesting so that students in spinning course students are willing to take this course again. The team competition system for spinning course is helpful for students to have habit of continuous exercise. This system assists to attract students.
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TAI-YUAN, CHEN, and 陳泰元. "The improvement of direct spinning of yarn in tow-cutting system." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/51456061718952815748.
Full textAbstract:
碩士國立臺灣科技大學
高分子工程系
93
The research adopted fiber-cutting system method to improve the drawbacks of stretch-breaking method as well as explore physical and mechanical properties. When implementing the experiment, the researcher took oxidized PAN tow as spinning materials and used fiber-cutting system to make tow become staple fiber arrayed in order. Furthermore, the form of tow to yarn was conducted to spun yarn under the condition of the draft ratio is one. In order to enhance the possibility of staple fiber, the polyester filament was used as the core during the experiment. Plus, the method of core-spun yarn was utilized; therefore, properties of fiber-cutting system were increased. Oxidized tow around the surface of the core, which enhanced the power of yarn of fiber-cutting system, expanded the core properties of LOI. At last, the spun yarns made by the methods mentioned above was not only observed externally but measured count, strength at break and made comparison of LOI.
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Fu, Ching-Hsiang, and 傅靖翔. "Tow-Cutting Apparatus in the Tow to Yarn Direct Spinning System." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/65662092801138939153.
Full textAbstract:
碩士國立臺灣科技大學
高分子系
96
his study employed oxidized fiber tows as raw materials for spinning oxidized yarns under different draft ratios and twist factors. The oxidized fiber tows were trimmed by a rotating cutter into stable fiber of equal length. This approach aims to reduce the time and stages required for producing spun yarns as well as to enhance the yarn quality. Experimental results show that the yarn quality achieved by this approach is still inferior to that obtained using traditional spinning approaches. More efforts are needed to improve the design of the rotating cutter and to ensure that the stable fiber cut can form a continuous yarn for spinning.
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林家億. "Dynamic Stability of a Spinning Disk with a Stationary Transverse Oscillating System." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/37912076003944276637.
Full textAbstract:
碩士國立臺灣科技大學
機械工程系
92
In the existing literature, the stationary load system acting on the a rotating disk is either a force or a load system of which the displacement of the mass is the same as the displacement of the disk at the contact point. However, due to the contact deformation between elastic contact bodies, the displacement of the mass of the load system may not be the same as the displacement of the disk at the contact point. This thesis studies the stability of a spinning disk subjected to a stationary oscillating system. The oscillating system consists of two parallel combinations of springs and dampers attached above and under a mass. The lower end of the oscillating system is assumed to contact with the disk closely. In this work, the Galerkin method is applied to obtain the discretized system equations. The system equations are then nondimensionalized. Finally, the natural frequencies and unstable regions of the combined system are calculated. Numerical results show that there is an extra horizontal line in the Campbell diagram. This horizontal line is the frequency line of the independent oscillating system. The frequency curves of the disk around this frequency line will be affected, and flutter type instability occurs between the oscillating system and the reflected modes of the disk.
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Sin-YiShih and 石欣宜. "Optimal Spinning Reserve Planning for Power System with High Renewable Energy Penetration." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/rk64st.
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Chen, Guan-Bo, and 陳冠博. "Sequential Molecular Arrangement Controlling and Electrostatic Spinning in Poly(imide-siloxane) System." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/15074546140659437546.
Full textAbstract:
碩士國立高雄應用科技大學
化學工程與材料工程系博碩士班
103
A series of designed segmented poly(amic acid-siloxane) (PAAS) from different level of 3,4'-Oxydianiline (3,4’-ODA) and α,ω-bis(3-aminopropyl)dimethyl siloxane (BATS) were successfully synthesized via a method of two step. Then, a series of poly(amic acid-siloxane) fibers were prepared by electrospinning. Subsequently, there were three different sequential type of the poly(imide-siloxane) fibers were obtained through thermal imidization. In addition, the resulting poly(imide-siloxane) (PIS) were characterized by FT-IR. The thermal properties of poly(imide-siloxane) were identified by thermal gravimetric analysis (TGA). The molecular weight of poly(amic acid-siloxane) were measured by gel permeation chromatography (GPC), and the molecular weights of synthesized poly(amic acid-siloxane) copolymers was controlled under the range of 90000 to 110000 g/mol. The surface morphologies of poly(imide-siloxane) fibers were observed by scanning electron microscopy (SEM). The factors for successful electrospinning, such as molecular weights, solution concentration and solution viscosity were also thoroughly investigated for three systems. In order to combine various above-mentioned factors, a newly promising factor, reduced viscosity for a successful electrospinning was attempted to be introduced to this paper for combining those interrelationship factors. The results showed that the poly(amic acid) with inner segment of siloxane (denoted as PAAS-Si) shows a worst filamentation among three systems, and the viscosity of poly(amic acid-siloxane) copolymers decreases with increasing BATS contents for each system. Final, the influences of different sequential segment and BATS contents on surface properties and mechanical properties of the poly(imide-siloxane) fibers were studied and characterized by contact angle meter (CA) and universal testing machine (UTM). The results showed that the polyimide with inner segment of siloxane (denoted as PIS-Si) shows a best tensile stress among three systems, and one with random segment (denoted as PIS-R) shows a best elongation at break among three systems. The elongation of the poly(imide-siloxane) fibers were also enhanced by increasing the BATS contents for each system.