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Ruth F Curtain - One of the best experts on this subject based on the ideXlab platform.
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optimal hankel norm approximation for the Pritchard salamon class of infinite dimensional systems
Integral Equations and Operator Theory, 2001Co-Authors: Amol Sasane, Ruth F CurtainAbstract:The optimal Hankel norm approximation problem is solved under the assumptions that the system Σ(A, B, C) is an exponentially stable, regular Pritchard-Salamon infinite-dimensional system. An explicit parameterization of all solutions is obtained in terms of the system parametersA, B, C.
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the kalman yakubovich popov lemma for Pritchard salamon systems
Systems & Control Letters, 1996Co-Authors: Ruth F CurtainAbstract:In this paper we generalize the Kalman-Yakubovich-Popov Lemma to the Pritchard-Salamon class of infinite-dimensional systems, i.e. systems determined by semigroups of operators on a Hilbert space with unbounded input and output operators. At the same time we prove a comparison theorem for Riccati equations of the same class.
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well posedness stabilizability and admissibility for Pritchard salamon systems
Toegepaste wetenschap, 1992Co-Authors: Ruth F Curtain, Stuart Townley, Hartmut Logemann, Heiko J ZwartAbstract:The object of this paper is to further develop the theory of Pritchard-Salamon systems, which are abstract in nite-dimensional systems allowing for a certain unboundedness of the control and observation operators. New results are derived on the transfer function and the impulse response of a Pritchard-Salamon system, on the well-posedness of feedback systems, on the invariance properties of the Pritchard-Salamon class under feedback and output injection, on the relation between bounded and admissible stabilizability and on the relationship between exponential and external stability.
David Gueryodelin - One of the best experts on this subject based on the ideXlab platform.
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transport of atom packets in a train of ioffe Pritchard traps
Physical Review A, 2006Co-Authors: Thierry Lahaye, Gael Reinaudi, Zhaoying Wang, Antoine Couvert, David GueryodelinAbstract:We demonstrate transport and evaporative cooling of several atomic clouds in a chain of magnetic Ioffe-Pritchard traps moving at a low speed $(l1\phantom{\rule{0.3em}{0ex}}\mathrm{m}∕\mathrm{s})$. The trapping scheme relies on the use of a magnetic guide for transverse confinement and of magnets fixed on a conveyor belt for longitudinal trapping. This experiment introduces a different approach for parallelizing the production of Bose-Einstein condensates as well as for the realization of a continuous atom laser.
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transport of atom packets in a train of ioffe Pritchard traps
Physical Review A, 2006Co-Authors: Thierry Lahaye, Gael Reinaudi, Zhaoying Wang, Antoine Couvert, David GueryodelinAbstract:We demonstrate transport and evaporative cooling of several atomic clouds in a chain of magnetic Ioffe-Pritchard traps moving at a low speed (<1 m/s). The trapping scheme relies on the use of a magnetic guide for transverse confinement and of magnets fixed on a conveyor belt for longitudinal trapping. This experiment introduces a different approach for parallelizing the production of Bose-Einstein condensates as well as for the realization of a continuous atom laser.
Gerhard Rempe - One of the best experts on this subject based on the ideXlab platform.
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free expansion of a bose einstein condensate from an ioffe Pritchard magnetic trap
Applied Physics B, 1998Co-Authors: U Ernst, J Schuster, Florian Schreck, A Marte, Axel Kuhn, Gerhard RempeAbstract:rubidium-87 atoms released from an Ioffe–Pritchard magnetic trap is investigated experimentally. The expansion dynamics depend only on the trap frequencies, which are determined independently. The data are in good agreement with the expected expansion of a condensate, and are clearly distinct from the behaviour of a classical gas in the hydrodynamic regime.
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bose einstein condensation in a pure ioffe Pritchard field configuration
EPL, 1998Co-Authors: U Ernst, J Schuster, Florian Schreck, A Marte, Gerhard RempeAbstract:A glass-cell apparatus and a dc magnetic trap with radial gradient of and axial curvature of were used to capture and evaporatively cool rubidium 87 atoms. Below a critical temperature of , Bose-Einstein condensation was observed with 106 atoms in the trap. Pure condensates with more than 105 atoms and peak densities exceeding were produced.
G.j. De Moraes - One of the best experts on this subject based on the ideXlab platform.
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Mites (Acari) of cassava (Manihot esculenta Crantz) habitat in southern Africa
'Informa UK Limited', 2018Co-Authors: Hanna R., G.j. De Moraes, Kreiter S., Phiri G., Jone A.Abstract:Consideration of possible side-effects of exotic biological control agents on their new environments is a necessary step in classical biological control programs. The evaluation of such effects usually requires the knowledge of the fauna present in those environments prior to introduction of control agents. This paper presents the first of a series of studies to evaluate the safety of a classical biological control program of the cassava green mite Mononychellus tanajoa (Bondar) in Mozambique and Malawi involving the introduction of Typhlodromalus aripo DeLeon, a predatory mite of the family Phytoseiidae. The objective of this study was to determine the mite fauna of cassava and of some of the visually most common plant species in or around cassava fields in those countries. The study was conducted at different occasions in the dry and rainy seasons, in 26 fields in Mozambique and 20 fields in Malawi representing a range of ecosystems. Twenty-one phytoseiid species were recorded in Mozambique and 32 in Malawi. On cassava, the dominant phytoseiids were Euseius baetae (Meyer & Rodrigues), Euseius bwende (Pritchard & Baker) and Typhlodromalus saltus(Denmark & Muma) in Mozambique, and Euseius fustis (Pritchard & Baker), Iphiseius degenerans (Berlese) and T. saltus in Malawi. On other plants, the dominant phytoseiids were Euseius baetae, Amblyseius sundi Pritchard & Baker and Parphytoseius horrifer (Pritchard & Baker) in Mozambique, and I. degenerans,Euseius magucii (Meyer & Rodrigues) and Euseius orygmus (Ueckermann & Loots) in Malawi. Several of the most common plants associated with cassava were observed to harbor phytoseiid species that were also found on the latter. Those plants may be important as reservoirs of such predators when conditions are not appropriate for them to live on cassava. This seemed to be particularly true for 6 phytoseiids in Mozambique (A. sundi, E. magucii, P. horrifer, Typhlodromalus spinosus(Meyer & Rodrigues), Typhlodromips shi (Pritchar & Baker) and Neoseiulus teke (Pritchard & Baker)), and 6 phytoseiids in Malawi (E. orygmus, Phytoseius amba Pritchard & Baker, T. shi, Typhlodromus (Anthoseius) kikuyuensis Swirski & Ragusa, Typhlodromus (Anthoseius) malawiensis Annou, Moraes & Hanna and N. teke), that were found on cassava at the end of the rainy season, but only on other plants in the dry season. M. tanajoa was the dominant mite species on cassava in both countries in addition to the phytoseiids; few other species were found on that plant in either country. A larger diversity of mites in addition to phytoseiids was found on other plants, but always at low numbers. Phytoseiids diversity and abundance varied between savannah and forest zones. These variations are likely due differences in biotic and abiotic factors between the two zones
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FIGURE 16 in Phytoseiid mites of the genus Euseius (Acari: Phytoseiidae) from SubSaharan Africa
2018Co-Authors: G.j. De Moraes, Ueckermann E. A., Oliveira A. R., Yaninek J. S.Abstract:FIGURE 16. Euseius lokele (Pritchard & Baker) (female): A. Dorsal shield; B. Ventral surface; C. Spermatheca; D. Leg IV
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FIGURE 14 in Phytoseiid mites of the genus Euseius (Acari: Phytoseiidae) from SubSaharan Africa
2018Co-Authors: G.j. De Moraes, Ueckermann E. A., Oliveira A. R., Yaninek J. S.Abstract:FIGURE 14. Euseius hutu (Pritchard & Baker) (female): A. Dorsal shield; B. Ventral surface; C. Spermatheca; D. Leg IV
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FIGURE 39 in Phytoseiid mites of the genus Euseius (Acari: Phytoseiidae) from SubSaharan Africa
2018Co-Authors: G.j. De Moraes, Ueckermann E. A., Oliveira A. R., Yaninek J. S.Abstract:FIGURE 39. Euseius talinga (Pritchard & Baker) (female): A. Dorsal shield; B. Ventral surface; C. Spermatheca; D. Leg IV
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FIGURE 12 in Phytoseiid mites of the genus Euseius (Acari: Phytoseiidae) from SubSaharan Africa
2018Co-Authors: G.j. De Moraes, Ueckermann E. A., Oliveira A. R., Yaninek J. S.Abstract:FIGURE 12. Euseius fustis (Pritchard & Baker) (female): A. Dorsal shield; B. Ventral surface; C. Spermatheca; D. Leg IV
Thierry Lahaye - One of the best experts on this subject based on the ideXlab platform.
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transport of atom packets in a train of ioffe Pritchard traps
Physical Review A, 2006Co-Authors: Thierry Lahaye, Gael Reinaudi, Zhaoying Wang, Antoine Couvert, David GueryodelinAbstract:We demonstrate transport and evaporative cooling of several atomic clouds in a chain of magnetic Ioffe-Pritchard traps moving at a low speed $(l1\phantom{\rule{0.3em}{0ex}}\mathrm{m}∕\mathrm{s})$. The trapping scheme relies on the use of a magnetic guide for transverse confinement and of magnets fixed on a conveyor belt for longitudinal trapping. This experiment introduces a different approach for parallelizing the production of Bose-Einstein condensates as well as for the realization of a continuous atom laser.
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transport of atom packets in a train of ioffe Pritchard traps
Physical Review A, 2006Co-Authors: Thierry Lahaye, Gael Reinaudi, Zhaoying Wang, Antoine Couvert, David GueryodelinAbstract:We demonstrate transport and evaporative cooling of several atomic clouds in a chain of magnetic Ioffe-Pritchard traps moving at a low speed (<1 m/s). The trapping scheme relies on the use of a magnetic guide for transverse confinement and of magnets fixed on a conveyor belt for longitudinal trapping. This experiment introduces a different approach for parallelizing the production of Bose-Einstein condensates as well as for the realization of a continuous atom laser.
