Search results for "valve"
showing 10 items of 576 documents
The effect of fish farming organic waste on food availability for bivalve molluscs (Gaeta Gulf, Central Tyrrhenian, MED): stable carbon isotopic anal…
2001
Stable carbon isotope (δ13C) analysis was used in a fish-farming impacted Mediterranean area (the Gulf of Gaeta, Central Tyrrhenian) to determine the predominant carbon sources available to bivalve molluscs cultivated around fish cages. Wether the organic matter generated by fish farming was taken up by the bivalve molluscs was also investigated. Stable carbon isotope values were measured in the particulate organic carbon (POC) of samples from potential organic matter sources such as fish-pelleted feed, mollusc faecal waste and bivalve flesh. The sources of organic matter affecting the study area water column and benthic communities appeared to be terrigenous-continental, autochthonous (phy…
Fabrication Techniques for Electrospun Polyurethane Scaffolds that Generate Valve Leaflet Mechanical Properties.
2010
Photoelectrochemical evidence of inhomogeneous composition at nm length scale of anodic films on valve metals alloys
2015
Anodic films of different thickness (∼30 nm and 70 nm) were grown by anodizing sputtering-deposited Ta-19at% Al to different formation voltages. N incorporation into the anodic films was inducing by performing the anodizing process in ammonium containing solutions. Layered anodic films were prepared by a double formation procedure with a first anodizing step in ammonium biborate solution and second anodizing step in borate buffer solution, or vice versa. Glow Discharge Optical Emission Spectroscopy was employed to show the distribution of N across the oxide. Photoelectrochemical measurements evidenced a red shift of the light absorption threshold due to N incorporation. A model was proposed…
Il monastero di Santa Maria delle Giummare di Sciacca tra XIV e XV secolo
2018
Il saggio si propone di ricostruire la storia tardomedievale del monastero di Santa Maria delle Giummare di Sciacca chiarendo la questione del carattere duplice del cenobio, fondato come priorato cluniacense ad opera di Giuditta, sorella di Ruggero II. L’analisi delle pergamene del tabulario di Santa Maria delle Giummare, unitamente allo studio dei fondi dell’Archivio di Palermo e dei registri notarili della sezione dell’Archivio di Sciacca, ha permesso di indagare la storia femminile del monastero benedettino e i rapporti con le Valverdensi di Caltabellotta che popolarono il cenobio a partire dal 1401 per volontà di Bonifacio IX. The essay aims to reconstruct the history of Santa Maria del…
Digital Hydraulic Technology for Linear Actuation:A State of the Art Review
2020
This paper analyses the current state of the art in linear actuation with digital hydraulics. Based on the differences in their aims the paper partitions the area into four actuation concepts – parallel valve solutions, single switching valve solutions, multi-chamber cylinders, and multi-pressure cylinders. The concepts are evaluated based on accuracy and smoothness of motion, switching load, reliability, efficiency and the number of components required.
Sociālā funkcionēšana pēc aortas vārstuļa protezēšanas vēlīnajā pēcoperācijas periodā
2017
Pētījuma „Sociālā funkcionēšana pēc aortas vārstuļa protezēšanas vēlīnajā pēcoperācijas periodā” mērķis ir izpētīt sociālo funkcionēšanu pēc aortas vārstuļa protezēšanas vēlīnajā pēcoperācijas periodā un noteikt baiļu iespējamo ietekmi sociālās funkcionēšanas rādītājos. Kvantitatīvā pētījuma rezultātā hipotēzes tiek galvenokārt apstiprinātas. Iegūtie dati raksturo fizisko un emocionālo pašsajūtu, attiecības ar līdzcilvēkiem un dzīvesveidu pēc aortas vārstuļa protezēšanas, kā arī baiļu ietekmi uz šiem rādītājiem. Tiek secināts, ka ir nepieciešama pacientu izglītošana pēc operācijas un pirmspensijas vecums ir kritiskākā vecuma grupa, kurai ir problēmas ar kaitīgo ieradumu praktizēšanu un atgr…
Tailoring Electrospinning Fabrication for Scaffolds for Heart Valve Tissue Engineering
2010
Previous work in controlling mechanical properties of electrospun scaffolds has largely been limited to altering the orientation of the fibrous network by either large rotational velocity or by altering the electric field during fabrication. Our lab has previously developed a technique to analyze the complete microstructural topology of electrospun scaffolds and extract key descriptors. In this project, we translated the target mandrel at varying speeds along its rotational axis in order to modify the microarchitecture without altering the fiber orientation angle. Using the algorithm mentioned above, we determined that increasing the translation speed resulted in a decrease in fiber interse…
Spin relaxation in Cu and Al spin conduits
2014
We study the spin relaxation in Al and Cu spin conduits embedded in non-local spin valve nanostructures. Measuring the key spin transport properties, we determine the spin and charge diffusion constants as well as the spin flip time. By varying the temperature, we find that the maximum of the non-local spin resistance change occurs at finite temperatures with a clear difference between Al and Cu. In particular, we find that the maximum of the non-local spin signal in Al is less pronounced and occurs at lower temperatures compared to Cu suggesting that the self-passivating Al surface plays a role. Having fabricated devices with both materials in identical processes, we can attribute the diff…
Element-specific ferromagnetic resonance in epitaxial Heusler spin valve systems
2011
Time-resolved x-ray magnetic circular dichroism was used to investigate epitaxial MgO(100)/Co2Cr0.6Fe0.4Al and MgO(100)/Co2Cr0.6Fe0.4Al/Cr/CoFe films. The precessional motion of the individual sublattice magnetization, excited by continuous microwave excitation in the range 2–10 GHz, was detected by tuning the x-ray photon energy to the L 3 absorption edges of Cr, Fe and Co. The relative phase angle of the sublattice magnetization's response is smaller than the detection limit of 2°. A weakly antiferromagnetically coupled CoFe layer causes an increase in the ferromagnetic resonance linewidth consisting of a constant offset and a component linearly increasing with frequency that we partly at…
Vanadyl dithiolate single molecule transistors: the next spintronic frontier?
2018
The role of Chemistry in the road towards quantum devices is the design of elementary pieces with a built-in function. A brilliant example is the use of molecular transistors as nuclear spin detectors, which, up to now, has been implemented only on [TbPc$_2$]$^-$. We argue that this is an artificial constraint and critically discuss the limitations of current theoretical approaches to assess the potential of molecules for their use in spintronics. In connection with this, we review the recent progress in the preparation of highly coherent spin qubits based on vanadium dithiolate complexes and argue that the use of vanadyl dithiolates as single molecule transistors to read and control a trip…