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Gotowe bibliografie tematyczne / Semi-isolation

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Gotowa bibliografia na temat „Semi-isolation”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 4 lutego 2022

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Artykuły w czasopismach na temat "Semi-isolation"

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Tůma, Š., K. Kučerová i M. Plocková. "Isolation of anticlostridially active lactobacilli from semi-hard cheese". Czech Journal of Food Sciences 26, No. 5 (31.10.2008): 324–32. http://dx.doi.org/10.17221/115/2008-cjfs.

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The group of 7 strains of facultatively heterofermentative lactobacilli (FHL) of the non starter lactic acid bacteria (NSLAB) isolated from semi-hard cheeses using a well agar diffusion assay possessed a different level of inhibition activity against 16 different strains of <I>Clostridium</I> sp. belonging to the species <I>Cl. butyricum, Cl. tyrobutyricum, Cl. beijerinckii</I>, and <I>Cl. sporogenes</I>. Two selected strains with the production of partially indentified anticlostridially active inhibitory substances, <I>Lb. paracasei</I> ST68 (producing hydrogen peroxide) and <I>Lb. paracasei</I> 171R2 (producing bacteriocin and hydrogen peroxide), were tested for the inhibition activity against gas producing <I>Cl. butyricum</I> 10702 and <I>Cl. tyrobutyricum</I> 184 in cheese slurry. The effects of both strains were different in reducing the numbers of gas producing <I>Cl. butyricum</I> 10702 by > 3 log cycles and <I>Cl. tyrobutyricum</I> 184 by > 1 log cycles in cheese slurry during the tested storage periods of 24 days at 13°C. The <I>Cl. tyrobutyricum</I> strains isolated from spoiled cheese were identified by species-specific PCR for <I>Cl. tyrobutyricum. </I>

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Karnopp, D. "Active and Semi-Active Vibration Isolation". Journal of Mechanical Design 117, B (1.06.1995): 177–85. http://dx.doi.org/10.1115/1.2836452.

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In the five decades since the founding of the ASME Design Engineering Division, the important problem of vibration isolation has been attacked first through the design of passive spring-damper suspensions and later by the use of active and semi-active elements. This paper reviews the historical development of theoretical concepts necessary for the design of isolation systems and indicates how control theory began to influence vibration isolation in the last half of this period. Practical active and semi-active suspensions have only recently become possible with the advent of powerful but relatively inexpensive signal processors. To illustrate these developments for engineers who have not been intimately involved with active systems, only simple vibrational system models will be discussed, although some modern hardware will be shown which is now being applied to complex systems. Instead of attempting to review the many theoretical concepts which have been proposed for active systems, this article will focus on a relatively simple idea with which the author has been associated over the past thirty years; namely the “skyhook” damper. This idea came through purely theoretical studies but is now used in combination with other concepts in production suspension systems. Two quite different application areas will be discussed. The first involves stable platforms to provide extreme isolation for delicate manufacturing operations against seismic inputs and the second involves automotive suspensions. Although similar concepts are found in these two application areas, the widely varying requirements result in very different suspension hardware. The special case of the semi-active damper, which requires very little control power and is presently reaching production, will also be discussed.

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Karnopp, D. "Active and Semi-Active Vibration Isolation". Journal of Vibration and Acoustics 117, B (1.06.1995): 177–85. http://dx.doi.org/10.1115/1.2838660.

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In the five decades since the founding of the ASME Design Engineering Division, the important problem of vibration isolation has been attacked first through the design of passive spring-damper suspensions and later by the use of active and semi-active elements. This paper reviews the historical development of theoretical concepts necessary for the design of isolation systems and indicates how control theory began to influence vibration isolation in the last half of this period. Practical active and semi-active suspensions have only recently become possible with the advent of powerful but relatively inexpensive signal processors. To illustrate these developments for engineers who have not been intimately involved with active systems, only simple vibrational system models will be discussed, although some modern hardware will be shown which is now being applied to complex systems. Instead of attempting to review the many theoretical concepts which have been proposed for active systems, this article will focus on a relatively simple idea with which the author has been associated over the past thirty years; namely the “skyhook” damper. This idea came through purely theoretical studies but is now used in combination with other concepts in production suspension systems. Two quite different application areas will be discussed. The first involves stable platforms to provide extreme isolation for delicate manufacturing operations against seismic inputs and the second involves automotive suspensions. Although similar concepts are found in these two application areas, the widely varying requirements result in very different suspension hardware. The special case of the semi-active damper, which requires very little control power and is presently reaching production, will also be discussed.

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Choi, Young-Tai, Norman M. Wereley i Young-Sik Jeon. "Semi-Active Vibration Isolation Using Magnetorheological Isolators". Journal of Aircraft 42, nr 5 (wrzesień 2005): 1244–51. http://dx.doi.org/10.2514/1.7919.

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Liu, Yong, i Li Hua Wen. "Vibration Isolation with Semi-Active Friction Damping". Advanced Materials Research 199-200 (luty 2011): 1041–45. http://dx.doi.org/10.4028/www.scientific.net/amr.199-200.1041.

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This study explores the effect of semi-active friction damping on vibration isolation systems by means of numerical simulation. Since the Lugre friction model can describe many phenomena observed in laboratories, it is chosen to provide accurate friction force model for the analysis and simulations. The drawback of the passive friction damping system is that it decreases the resonance response at the cost of worsening the performance for high frequencies. A semi-active control method (skyhook method) is used to tune the normal force so that the energy dissipated by the friction force is maximized. Such semi-active friction damping system is simple but efficient, and it can achieve result almost as good as that of active systems. Results from numerical simulations show that compared with passive system, semi-active control method decreases the response significantly for both low and high frequencies, with harmonic and random excitations.

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Sudoplatov, Sergey, i Predrag Tanović. "Semi-Isolation and the Strict Order Property". Notre Dame Journal of Formal Logic 56, nr 4 (2015): 555–72. http://dx.doi.org/10.1215/00294527-3153579.

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Steadman, J. R., J. Marcinkowska i S. Rutledge. "A Semi-Selective Medium for Isolation ofSclerotiniaSclerotiorum". Canadian Journal of Plant Pathology 16, nr 1 (marzec 1994): 68–70. http://dx.doi.org/10.1080/07060669409500791.

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Alanoly, J., i S. Sankar. "Semi-active force generators for shock isolation". Journal of Sound and Vibration 126, nr 1 (październik 1988): 145–56. http://dx.doi.org/10.1016/0022-460x(88)90404-x.

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Paget, Michelle, Hilary Murray, Clifford J. Bailey i Richard Downing. "Human islet isolation: semi-automated and manual methods". Diabetes and Vascular Disease Research 4, nr 1 (marzec 2007): 7–12. http://dx.doi.org/10.3132/dvdr.2007.010.

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Gavin, Henri P., i Anton Zaicenco. "Performance and reliability of semi-active equipment isolation". Journal of Sound and Vibration 306, nr 1-2 (wrzesień 2007): 74–90. http://dx.doi.org/10.1016/j.jsv.2007.05.039.

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Rozprawy doktorskie na temat "Semi-isolation"

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Nguyen, The Minh. "A Novel Semi-Active Magnetorheological Mount for Vibration Isolation". University of Toledo / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1250008519.

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Liu, Yuyou. "Semi-active damping control for vibration isolation of base disturbances". Thesis, University of Southampton, 2004. https://eprints.soton.ac.uk/66164/.

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This thesis is concerned with semi-active damping control for vibration isolation of base disturbances. The aim is to investigate the effectiveness and suitability of semi-active damping control strategies for improving steady-state vibration isolation. A single-degree-of-freedom (SDOF) system, comprising a semi-active damper with a linear passive spring in parallel, is used to study the vibration isolation of base excitation. The semi-active control strategies investigated include on-off skyhook control, continuous skyhook control, on-off balance control and continuous balance control. Chatter and jerk problems are investigated, which can arise in numerical simulations and possibly in practice when using semi-active control strategies. Anti-chatter and anti-jerk control strategies are proposed. These control strategies are implemented numerically in Matlab/Simulink. Harmonic, periodic and random disturbances are considered in this thesis. The vibration isolation performance is evaluated in terms of Root-Mean-Square (RMS) acceleration transmissibility. The performance of these control strategies for the isolation of harmonic disturbances is firstly studied. The performance is compared with those of an adaptive-passive control strategy, a conventional and a skyhook passive damper. Results show that the semi-active control strategies can provide a better isolation than a conventional passive system with an equivalent damping level. The semi-active damper can provide isolation over the whole frequency range if the on-state damping of the semi-active damper is big enough. The fraction of time when the damper is turned on or off is found to be frequency dependent. The effects of secondary frequency, which is a harmonic or subharmonic of the fundamental frequency on switching time of the semi-active damper for isolation of the primary harmonic are examined. Upper bounds are derived for fraction of time when the switching time for the fundamental frequency may be affected by the presence of a secondary frequency. The performance of the semi-active isolation system for periodic and random disturbances, where there is more than one harmonic in the disturbance spectrum is investigated. The results for square wave and triangular wave disturbances suggest that semi-active control strategies are promising for periodic disturbance. Three special cases are considered for random disturbances when the acceleration, velocity and displacement inputs have flat spectra. The semi-active control strategies can provide some advantage in performance for random velocity and displacement disturbances with medium to high damping ratios. Only continuous skyhook control strategy can provide some benefit in isolation performance for random acceleration disturbances. Following on from the numerical simulations, experimental work is carried out to validate the simulation results. The experimental set-up incorporates an electromagnetic device as a semi-active damper. The on-off skyhook control algorithm is chosen to be implemented using an analogue circuit. The damping of the electromagnetic semi-active damper is achieved by opening and closing the magnet-coil circuit. Numerical predictions are confirmed by experimental observation. The performance of the electromagnetic damper is limited by the achievable damping level.

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St-Amand, Olivier. "Modélisation semi-analytique dynamique d'un actionneur THUNDER utilisé en isolation vibratoire". Thesis, Université Laval, 2012. http://www.theses.ulaval.ca/2012/28744/28744.pdf.

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Hammond, Nicholas L. "Isolation, semi-synthesis and synthesis of agents for cancer, HIV, and malaria /". Full text available from ProQuest UM Digital Dissertations, 2008. http://0-proquest.umi.com.umiss.lib.olemiss.edu/pqdweb?index=0&did=1850432521&SrchMode=1&sid=1&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1279646503&clientId=22256.

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Thesis (Ph.D.)--University of Mississippi, 2008.
Typescript. Vita. "January 2008." Major professor: Mitchell A. Avery Includes bibliographical references (leaves 200-226). Also available online via ProQuest to authorized users.

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Liu, Yanqing. "Variable damping and stiffness semi-active vibration isolation control using magnetorheological fluid dampers". 京都大学 (Kyoto University), 2005. http://hdl.handle.net/2433/144553.

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Jean, Pierrick. "Isolation vibratoire par contrôle semi-actif d'amortisseurs magnéto-rhéologiques pour l'interface lanceur/charge utile". Phd thesis, Conservatoire national des arts et metiers - CNAM, 2006. http://tel.archives-ouvertes.fr/tel-00352710.

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Le travail présenté dans cette thèse a pour objet l'isolation vibratoire entre 5 et 100 Hz d'une charge utile durant les 150 premières secondes de son lancement, par contrôle semi-actif d'amortisseurs magnéto-rhéologiques. L'isolateur envisagé est une interface souple dont les modes, compris entre 2 et 7 Hz, sont amortis par le dispositif à amortissement contrôlable. Dans un premier temps, afin de réaliser des simulations de contrôle semi-actif réalistes, un modèle de l'amortisseur magnéto-rhéologique utilisé est identifié à partir des mesures de l'effort et de la vitesse du piston. Puis on étudie l'isolateur semi-actif à 1 degré de liberté, à la fois par simulations et expérimentalement. On s'intéresse en particulier au contrôleur skyhook damper et à ses performances d'isolation haute fréquence et d'amortissement basse fréquence pour différents types d'excitations large bande, performances qui sont systématiquement comparées à celles de l'isolateur passif optimal. On présente ensuite une étude originale qui concerne un isolateur semi-actif à 6 degrés de liberté, basé sur la plateforme de Stewart, dont un démonstrateur expérimental a été développé et testé. On détaille en particulier les résultats du contrôle par Integral Force Feedback semi-actif pour les excitations lanceur reproduites expérimentalement. Enfin, l'étude est étendue à la configuration échelle 1 pour laquelle on envisage les performances de confort et de sécurité de l'isolateur. On considère en particulier un cas d'excitation transitoire latérale, la rafale de vent, pour laquelle on développe un contrôleur on-off à seuil de déclenchement, lequel semble également efficace pour l'isolation vibratoire. L'isolateur semi-actif ainsi obtenu semble présenter de meilleures performances qu'un isolateur passif stationnaire, tout en étant conforme aux contraintes propres à l'environnement lanceur.

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Hiemenz, Gregory J. "Semi-active magnetorheological seat suspensions for enhanced crashworthiness and vibration isolation of rotorcraft seats". College Park, Md.: University of Maryland, 2007. http://hdl.handle.net/1903/7602.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2007.
Thesis research directed by: Dept. of Aerospace Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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Tanner, Edward Troy. "Combined Shock and Vibration Isolation Through the Self-Powered, Semi-Active Control of a Magnetorheological Damper in Parallel with an Air Spring". Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/29541.

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Combining shock and vibration isolation into a single isolation system package is explored through the use of an air spring in parallel with a controlled magnetorheological fluid damper. The benefits of combining shock and vibration isolation into a single package is discussed. Modeling and control issues are investigated and test and simulation results are discussed. It is shown that this hybrid isolation system provides significantly increased performance over current state-of-the-art passive systems. Also explored is the feasibility of scavenging and storing ambient shipboard vibration energy for use in powering the isolation system. To date the literature has not adequately explored the direct design of a combined shock and vibration isolation system. As shock and vibration isolation are typically conflicting goals, the traditional approach has been to design separate shock and vibration isolation systems and operate them in parallel. This approach invariably leads to compromises in terms of the performance of both systems. Additionally, while considerable research has been performed on magnetorheological fluids and devices based on these fluids, there has been little research performed on the use of these fluids in devices that are subjected to high velocities such as the velocity seen by a ship exposed to underwater near-miss explosive events. Also missing from the literature is any research involving the scavenging and storage of ambient shipboard vibration energy. While the focus of this work is on the use of this scavenged energy to power the subject isolation system, many other uses for this energy can be envisioned. Experimental and analytical results from this research clearly show the advantages of this hybrid isolation system. Drop tests show that inputs as great as 167 g's were reduced to 3.42 g's above mount at 1.11 inches of deflection using a Velocity Feedback controller suggested by the author. When contrasted with typical test results with similar inputs, the subject isolation system achieved reductions in above mount accelerations of 300% and reductions in mount deflections of 200% over current state-of-the-art passive shipboard isolation systems. Furthermore, simulations using a validated model of the isolation system suggest that this performance improvement can be achieved in multi-degree-of-freedom isolation systems as well. It was shown that above mount accelerations in the vertical and athwartship directions could be effectively limited to a predefined value, while achieving the absolute minimum mount defections, using an Acceleration Limiting Bang-Bang controller suggested by the author. Further experimentation suggests that the subject isolation system could be entirely self-powered from scavenged ambient shipboard vibration energy. An experiment using an energy scavenging and storage system consisting of a Piezoelectric Stack Generator and a bank of ultracapacitors showed that enough energy could be harvested to power the isolation system though several shock events.
Ph. D.

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Shi, Yundong. "Enhancement of Functionality of Structures Using Isolation and Semi-Active Control in Consideration of Performance of Furniture and Appliances". 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/180496.

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Arzanpour, Siamak. "Active and Semi-Active Bushing Design for Variable Displacement Engine". Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/2886.

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The Variable Displacement Engine (VDE) is a new generation of engines that are designed to decrease the fuel consumption at the cruise speed of a vehicle. The isolation of the VDE's new vibration pattern is beyond the capabilities of conventional mounts and bushings. Consequently, in this thesis, novel active and semi-active solutions are proposed to develop various semi-active and active hydraulic bushing proof-of-concept systems that may solve the isolation problem in a VDE system.

The dynamic stiffness response, which is the transfer function that relates the engine displacement to the transmitted force, is normally used as the key design criterion for engine mounts and bushings. In this thesis, a linear mathematical model of a conventional hydraulic bushing is purposed. The validity of the mathematical model is confirmed by an experimental analysis, and the various parameters in the dynamic stiffness equation are evaluated. The experimental results indicate that the dynamic stiffness frequency response of the conventional hydraulic bushing has both soft and stiff regions. The soft region is limited to low frequencies. For the VDE isolation, the goal is to provide a soft bushing for a wider range of frequencies than a conventional bushing can accommodate. Addition of a short inertia track, similar to a decoupler used in conventional hydraulic engine mounts, may be used to extend the soft region of a conventional hydraulic bushing, and the experimental results validate it.

Since the short inertia track provides no additional damping, a supplementary Magnetorheological (MR) valve is also devised. The MR valve has the advantage to minimize the amount of MR fluid used, which significantly reduces the cost of the overall system. The novel valve allows the damping coefficient of the bushing assembly to be controlled by varying the electrical current input to a solenoid coil. A mathematical model is derived for the MR bushing, and is validated experimentally.

In addition, an active bushing to solve the VDE isolation problem is purposed in this thesis. In this bushing, a magnetic actuator, composed of a permanent magnet and a solenoid coil, is included in the active bushing. This active chamber affects the dynamic stiffness response of the bushing by altering the bushing's internal pressure. The nonlinear equation of motion of the permanent magnet is linearized and is incorporated into the new mathematical model of the system. The new purposed model for the active bushing is in good agreement with the experimental results. This active chamber is also proved capable of producing complex dynamic stiffness frequency response.

The conclusion is that the proposals in this thesis can contribute to the isolation of the vibration pattern, imposed by the application of a VDE system.

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Książki na temat "Semi-isolation"

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King, Stephen. The Shining / 'Salem's Lot / Night Shift / Carrie. Wyd. 5. New York, USA: Octopus/Heinemann, 1985.

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Balay, Anne. Semi Queer. University of North Carolina Press, 2018. http://dx.doi.org/10.5149/northcarolina/9781469647098.001.0001.

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Long-haul trucking is linked to almost every industry in America, yet somehow the working-class drivers behind big rigs remain largely hidden from public view. Gritty, inspiring, and often devastating oral histories of gay, transsexual, and minority truck drivers allow award-winning author Anne Balay to shed new light on the harsh realities of truckers' lives behind the wheel. A licensed commercial truck driver herself, Balay discovers that, for people routinely subjected to prejudice, hatred, and violence in their hometowns and in the job market, trucking can provide an opportunity for safety, welcome isolation, and a chance to be themselves--even as the low-wage work is fraught with tightening regulations, constant surveillance, danger, and exploitation. The narratives of minority and queer truckers underscore the working-class struggle to earn a living while preserving one's safety, dignity, and selfhood. Through the voices of drivers from marginalized communities who spend eleven- to fourteen-hour days hauling America's commodities in treacherous weather and across mountain passes, Semi Queer reveals the stark differences between the trucking industry's crushing labor practices and the perseverance of its most at-risk workers.

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Mayer, Nonna. The Radical Right in France. Redaktor Jens Rydgren. Oxford University Press, 2018. http://dx.doi.org/10.1093/oxfordhb/9780190274559.013.22.

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After providing a quick summary of the long history of the French radical right, from the reaction to the revolution of 1789 to the creation of the Front National in 1972, this chapter focuses on the changes brought about by Marine Le Pen since she took over her father’s party in 2011. Her “de-demonization” strategy has indeed improved the image of the movement and attracted new voters. But the nativist anti-immigrant message is the same as Jean-Marie Le Pen’s. And the Front National still suffers from political isolation; while it has sometimes won the first round of elections, it has yet to achieve a majority in the second round. After its semi-defeat in the 2017 elections, the very opportunity of the de-demonization strategy is being questioned inside the party.

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King, Stephen. Stephen King. Octopus Books, 1987.

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Części książek na temat "Semi-isolation"

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Zhu, Yunpeng. "Nonlinear Damping Based Semi-active Building Isolation System". W Springer Theses, 131–53. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70833-7_6.

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Haque, Ziaul, i Mujeebur Rahman Khan. "Rotylenchulidae: Rotylenchulus species." W Handbook of invasive plant-parasitic nematodes, 407–20. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789247367.0012.

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Abstract The reniform nematodes of the genus Rotylenchulus are sedentary and semi-endoparasites of plants. This chapter includes information on: authentic identification; geographical distribution; risk of introduction; host ranges; symptoms; biology and ecology; planting material liable to carry the nematode; chance of establishment; likely impact; phytosanitary measures; and a detailed account of diagnosis procedures, such as sampling, isolation/detection and identification with morphological and molecular characterization, of invasive Rotylenchulus species.

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Krzyzynski, Tomasz, Igor Maciejewski, Lutz Meyer i Henning Meyer. "A Method of Shaping the Vibro-isolation Properties of Semi-active and Active Systems". W Modelling and Control Design of Vibration Reduction Systems, 155–80. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-03047-6_8.

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Flament, I., U. Keller i L. Wünsche. "Use of semi-preparative supercritical fluid chromatography for the separation and isolation of flavor and food constituents". W Supercritical Fluid Processing of Food and Biomaterials, 62–74. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2169-3_5.

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Weber, Felix, Hans Distl i Christian Braun. "Semi-Active Base Isolation of Civil Engineering Structures Based on Optimal Viscous Damping and Zero Dynamic Stiffness". W Conference Proceedings of the Society for Experimental Mechanics Series, 1–9. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54777-0_1.

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Mukai, Yoichi, i Hideo Fujitani. "Development of Resilient Seismic Response Control with a Semi-active System". W Seismic Isolation, Structural Health Monitoring, and Performance Based Seismic Design in Earthquake Engineering, 55–83. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-93157-9_2.

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Karnopp, Dean. "Active and semi-active vibration isolation". W Current Advances in Mechanical Design and Production VI, 409–23. Elsevier, 1995. http://dx.doi.org/10.1016/b978-008042140-7/50037-8.

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Matsuhisa, Hiroshi, Hideo Utsuno i Yanqing Liu. "Semi-active vibration isolation system with stiffness on-off control". W World Forum on Smart Materials and Smart Structures Technology. CRC Press, 2008. http://dx.doi.org/10.1201/9781439828441.ch127.

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Faruque Ali, Sk, Ananth Ramaswamy i Anil Agarwal. "Semi-active base isolation system for buildings using MR dampers". W World Forum on Smart Materials and Smart Structures Technology. CRC Press, 2008. http://dx.doi.org/10.1201/9781439828441.ch30.

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Komatsu, H., Y. Shinozaki, Y. Sanui, R. Maseki, K. Yoshida, Y. Kitagawa, J. Toyama i I. Nagashima. "A building with semi-active base isolation using sliding mode control". W World Forum on Smart Materials and Smart Structures Technology. CRC Press, 2008. http://dx.doi.org/10.1201/9781439828441.ch266.

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Streszczenia konferencji na temat "Semi-isolation"

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"Semi-active building base isolation". W Proceedings of the 1999 American Control Conference. IEEE, 1999. http://dx.doi.org/10.1109/acc.1999.782881.

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Choi, Young-Tai, Norman M. Wereley i Young-Sik Jeon. "Semi-active vibration isolation using magnetorheological isolators". W SPIE's 9th Annual International Symposium on Smart Structures and Materials, redaktor Gregory S. Agnes. SPIE, 2002. http://dx.doi.org/10.1117/12.472663.

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Aldemir, Unal, i Henri Gavin. "Comparison of Semi-Active Dampers in Seismic Isolation". W Structures Congress 2001. Reston, VA: American Society of Civil Engineers, 2001. http://dx.doi.org/10.1061/40558(2001)116.

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Yoshida, Kazuo, i Tadahiro Fujio. "Semi-Active Base Isolation for a Building Structure". W ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/movic-8427.

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Abstract Semi-active control methods, where coefficient of viscous damping or spring constant are changed effectively according to the state of control object, have received much attention from control performance and energy consumption. This study deals with the application of semi-active control method to base isolation control. Semi-active damper is classified into a bilinear system which belongs to a nonlinear system. The bilinear optimal control theory using feedforward control of disturbance is applied to a base isolation control problem of building structure. The variable damper used in this study is a discrete type of coefficient and it takes delay to switch the coefficient. By taking account of these characteristics, the control performance is investigated in the numerical calculation. As a result, it was shown that the method has high control performance in a wide frequency range, and it is effective for the vibration base isolation of building structures.

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Sun, Tao, i Fanbing Li. "Signal analysis for a semi-active suspension isolation system". W Third International Symposium on Precision Mechanical Measurements. SPIE, 2006. http://dx.doi.org/10.1117/12.716517.

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Choi, Young-Tai, Hyun Jeong Song i Norman M. Wereley. "Semi-Active Isolation System Using Self-Powered Magnetorheological Dampers". W ASME 2009 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2009. http://dx.doi.org/10.1115/smasis2009-1358.

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This study addresses experimental evaluation of a semi-active vibration isolation system using a self-powered magnetorheological (MR) damper. To this end, a self-powered MR damper was constructed by electronically connecting an MR damper with a power harvesting dynamic vibration absorber (DVA) that can convert mechanical energy due to vibration and shock into electrical energy by means of electromagnetic induction. In this study, an MR damper for seat suspensions of the Expeditionary Fighting Vehicle (EFV) was chosen for the application of the self-powered MR damper. The generated voltage, current, and power of the power harvesting DVA were experimentally measured in frequency domain under various acceleration levels of 0.3–1.2 g (where one g = 9.81 m/s2). In addition, damper force testing of the self-powered MR damper (i.e., in this study, a prototype EFV MR damper with the power harvesting DVA) was experimentally conducted in time and frequency domains. To evaluate vibration isolation performance of a semi-active isolation system using the self-powered MR damper, an EFV seat suspension mockup using the self-powered MR damper was constructed. Under eight different representative random excitation accelerations, the vibration isolation performance of the EFV seat suspension mockup using the self-powered MR damper was experimentally evaluated.

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Duan, Hongjie, i Hao Tao. "Simulation Research on Vehicle Semi-active Vibration Isolation System". W 2010 International Conference on Electrical and Control Engineering (ICECE). IEEE, 2010. http://dx.doi.org/10.1109/icece.2010.1359.

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Wei, Kexiang, Guang Meng, Hong You i Yingchun Liu. "Study on a new semi-active vibration isolation system". W Second International Conference on Smart Materials and Nanotechnology in Engineering, redaktorzy Jinsong Leng, Anand K. Asundi i Wolfgang Ecke. SPIE, 2009. http://dx.doi.org/10.1117/12.840173.

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Yoshida, Shigeaki, i Kazuo Yoshida. "Semi-Active Vibration Isolation Control Using Feedforward Information of Disturbance". W ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/vib-3820.

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Abstract Since the suppression of actuator power for active structural vibration control is an important problem, semi-active control methods receive much attention. In this paper, a new semi-active control method for the vibration isolation is presented. By taking the dynamics of disturbance into consideration, the optimal control method is applied to the augmented system that includes both the control object and the disturbance. By utilizing the obtained control law with a feedfoward link of disturbance, it is used for the semi-active control law based on the semi-active constraint of variable damper. The control method was applied to the 4-DOF structural vibration isolation. The numerical analysis showed that the method has high control performance in a wide frequency range, and it is effective for the vibration isolation of building structures.

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Hiemenz, Gregory, Wei Hu i Norman Wereley. "Semi-Active Magnetorheological Helicopter Crew Seat Suspension for Vibration Isolation". W 48th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-1722.

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