637 research outputs found
Cercariae and diplostomules of Diplostomum spathaceum (Digenea) elicit an immune response in rainbow trout, Salmo gairdneri Richardson
No full textOverwintering yellow perch fry in Alabama
No full textWild harvests of yellow perch Perca flavescens have failed to keep up with the strong market demand for the fish. Moreover, yellow perch has many attributes that make it attractive for commercial aquaculture in the USA. One drawback to yellow perch culture in the north-central region of the United States is that low winter water temperatures inhibit somatic growth. In this study, yellow perch juveniles were stocked at three densities (30, 60, and 90 per tank) in 600-L tanks in Auburn, Alabama, in early January and maintained throughout the winter until mid-April. Water in the tanks was circulated through an earthen pond and returned to the research system by means of a water pump. Tanks were aerated by means of submersible air diffusers and a regenerative air blower. Fish were offered a commercial, slow-sinking feed at 5percent of body weight, and temperature was measured hourly by a remote data logger. Survival was greater than 99percent in all treatments. When water temperature was below 20°C, absolute growth was 0.06, 0.05, and 0.04 g-d for the low-, medium-, and high-stocking density treatments, respectively. When water temperature was above 20°C, absolute growth was 0.58, 0.48, and 0.46 g-d for the low-, medium-, and high-stocking density treatments, respectively. Yellow perch juveniles survived well and grew well in Alabama during fall and spring seasons when temperatures were above 20°C.Anderson Richard O., 1996, P447; BELONGER B, 1986, P 1986 GREEN BAY FOX, P25; BROMAGE N, 1988, INTENSIVE FISH FARMI, P50; BROWN ME, 1946, J EXP BIOL, V22, P118; Brown P.B., 2002, Journal of Applied Aquaculture, V12, P43, DOI 10.1300-J028v12n01_02; BUTTNER JK, 1989, AQUACULTURE MAGAZINE, V15, P37; DOWNS W, 1983, WISSG83142 U WISC SE; Head AB, 2000, J WORLD AQUACULT SOC, V31, P73, DOI 10.1111-j.1749-7345.2000.tb00700.x; Hecht Thomas, 1993, Journal of the World Aquaculture Society, V24, P246, DOI 10.1111-j.1749-7345.1993.tb00014.x; Heidinger R.C., 1986, P103; Henderson BA, 2000, J FISH BIOL, V57, P122, DOI 10.1006-jfbi.2000.1293; Hopkins Kevin D., 1992, Journal of the World Aquaculture Society, V23, P173, DOI 10.1111-j.1749-7345.1992.tb00766.x; Calbert H.E., 1976, Proceedings a Meet Wld Maricult Soc, V7, P137; JOBLING M, 1983, J FISH BIOL, V22, P577, DOI 10.1111-j.1095-8649.1983.tb04217.x; KITCHELL JF, 1977, J FISH RES BOARD CAN, V34, P1922; KOEBELE BP, 1985, ENVIRON BIOL FISH, V12, P181, DOI 10.1007-BF00005149; Kokurewicz B, 1971, PHYSIOL FISHES, V47, P1; LECREN ED, 1951, J ANIM ECOL, V20, P201; LESSER WH, 1979, RES B U WISCONSIN CO, V3006; MALISON JA, 1992, AQUACULTURE, V104, P67, DOI 10.1016-0044-8486(92)90138-B; MALISON JA, 1988, CAN J FISH AQUAT SCI, V45, P1942; RIEPE JR, 1997, TECHNICAL B SERIES, V111; SAS Institute, 2000, SAS STAT US GUID VER; Smith-Vaniz WF, 1968, FRESHWATER FISHES AL; Tidwell JH, 1999, J WORLD AQUACULT SOC, V30, P324, DOI 10.1111-j.1749-7345.1999.tb00683.x11
Measurement and Mitigation of Passive Intermodulation Distortion
No full textPassive intermodulation (PIM) causes unwanted distortion signals in high power radio systems such as satellite links, wireless base stations, and harmonic radars. In general passive wireless components such as cables, connectors, filters, and antennas are linear and thus do not create intermodulation. However, under high powers this is sometimes not the case and PIM is generated. The physical mechanisms causing PIM are not well understood, partially because they are difficult to measure. Furthermore strategies to reduce PIM in system design are sparse. In this thesis PIM measurement techniques are developed and demonstrated which enable differentiation and physical understanding of PIM leading to reduction of PIM in future high power systems. First, measuring higher order intermodulation products is shown to reveal significant information about the PIM source. For example, this information allows the differentiation of two types of coaxial connectors which would appear identical using standard PIM measurement techniques. Second, the standing wave of voltage and current inside a resonator is used to increase the voltage and current selectively at the PIM source. This method extends the measurement sensitivity of any system, and also allows differentiation between voltage and current induced PIM sources. Finally, two mitigation techniques are presented which leverage measurement capabilities developed in this thesis to give low PIM design techniques for systems. The first is a method for designing matching networks to reduce the effect of PIM generating components, and the second uses a magnetically tunable network to cancel PIM sources
Opportunities for microfluidic technologies in synthetic biology
No full textWe introduce microfluidics technologies as a key foundational technology for synthetic biology experimentation. Recent advances in the field of microfluidics are reviewed and the potential of such a technological platform to support the rapid development of synthetic biology solutions is discussed
Protection of rainbow trout, Oncorhynchus mykiss (Richardson), against Diplostomum spathaceum (Digenea): the role of specific antibody and activated macrophages
No full textCytotoxic reactions of rainbow trout, Salmo gairdneri Richardson, macrophages for larvae of the eye fluke Diplostomum spathaceum (Digenea)
No full textRecorder – June 1951
No full textNo volume or issue number givenGraduating Exercises 1951 / Rev. Andrew MacBeath -- An Increasing Ministry / Principal J.B. Rhodes -- The Transfigured Life / Rev. D.A. Burns -- Graduation Testimonies / Jean Hill and Chris Costerus -- Hearty Congratulations -- T.B.C. Summer Camp -- Toronto Branch Alumni Activities / Reuben Chappell and Alex Deans -- News of the T.B.C. Family: Births – Marriages – Personals.http://www.archive.org/details/recorderjun1951572tor
Filter design methods applied to panelized antenna array integration for digital backends
No full textDigital arrays offer much greater flexibility at a lower cost than traditional analog arrays. A digital array need not be fixed to a single purpose, but can be designed to be capable of performing multiple functions at once. As much of a digital array\u27s functionality is implemented in software, the RF frontend can be quite simple relative to traditional analog arrays. This fact, along with recent advances in solid state technology makes it possible to integrate the RF frontend, including antennas, into a single panel using standard multilayer board manufacturing techniques, as will be demonstrated herein. To further improve this integration, a technique will be demonstrated in which antennas and filters can be designed as a single unit using traditional filter design techniques. Furthermore, these design techniques are extended to multiple antenna systems by enabling simultaneous transmit and receive. Systems designed for simultaneous transmit and receive must implement new techniques in the RF hardware to isolate the receive paths from the high-power transmit signals. The use of tunable resonators at the antenna panel allows deep isolation to be achieved. The largest source of transmit to receive coupling in an array is due to coupling between antenna elements, which can be controlled through active baffle design viewed as a portion of a larger filtering system. Proposed and demonstrated herein are two distinct techniques to ensure high isolation between antenna elements using baffles consisting of tunable filter elements. These techniques improve isolation by over 50 dB, making simultaneous transmit and receive feasible
Deconstructing normalisation: clearing the way for inclusion
No full textThis paper considers two major movements affecting the lives of people with an intellectual disability: normalisation and inclusion. The authors look back at the normalisation movement, reviewing its aims, processes and outcomes, and explore its relationship and compatibility with inclusion. In looking forward to the realisation of the inclusion agenda they ask whether normalisation is a suitable platform on which to build inclusion, or whether a process of deconstruction is needed. They discuss what lessons can be learnt from normalisation for the inclusion movement
Fabric-based strain sensors for measuring movement in wearable telemonitoring applications
No full textThis paper summarises preliminary work comparing conductive yarns, knitting structures and yarn compositions in order to integrate smart sensor strips into a surrounding garment as a kinematic measurement tool. The conductive areas of the garment were to be used as a strain-sensitive material; ultimately measuring knee joint movement. In total, thirty sample fabrics were developed using conductive yarns; six of which were chosen to be tested for responsiveness during repeated strain. Preliminary tests showed good levels of responsiveness to strain and acceptable levels of recovery
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