391 research outputs found
Constraints in total knee arthroplasty: current status and review of literature
Appropriate selection of prosthesis is critical for success of total knee arthroplasty. It is a daunting task of arthroplasty surgeon to choose from a wide array of implant design for a given situation to confer optimal stability, which translates into satisfactory outcome. Contemporary evolution of prosthetic design with various levels of constraints has revolutionized the approach to total knee arthroplasty. This paper deals with the succinct review of the level of constrained prosthesis available for knee arthroplasty
Histopathology of gill, liver, muscle and brain of Cyprinus carpio communis L. exposed to sublethal concentration of lead and cadmium
Histological studies in organs like gill, liver, muscle and brain of Cyprinus carpio communis were made to assess tissue damage due to sublethal concentration of heavy metals lead and cadmium after 28 days of exposure. In lead treated gill, disintegration and fusion of primary lamellae, extensive vacuolization with disruption of epithelial lining was observed, whereas on sublethal exposure to cadmium, hyperplasia of branchial arch, vacuolization and congestion of blood vessels were well marked. Metal accumulation was clearly visible in treated liver with degeneration and severe necrosis. Both lead and cadmium treated fish showed marked thickening and separation of muscle bundles with severe intramuscular oedema more pronounced in sublethal treatment of cadmium. Neuronal cell degeneration, swelling of pyramidal cells, vacuolization and dystrophic changes were characteristic features observed in treated brain.Key words: Lead, cadmium, histopathology, Cyprinus carpio communis
Wideband Josephson Parametric Isolator
The cryogenic hardware required to build a superconducting qubit based
quantum computer demands a variety of microwave components. These elements
include microwave couplers, filters, amplifiers, and circulators/isolators.
Traditionally implemented as discrete components, integration of this
peripheral hardware, in an effort to reduce overall footprint, thermal load,
and added noise, is a key challenge to scaling modern quantum processors with
qubit counts climbing over the 100+ mark. Ferrite--based microwave isolators,
generally employed in the readout chain to decouple qubits and resonators from
readout electronics, persist as one of the volumetrically largest devices still
utilized as discrete components. Here we present an alternative two--port
isolating integrated circuit derived from the DC Superconducting Quantum
Interference Device (DC--SQUID). Non--reciprocal transmission is achieved using
the three--wave microwave mixing properties of a flux-modulated DC--SQUID. We
show that when multiple DC--SQUIDs are embedded in a multi--pole admittance
inverting filter structure, the three--wave mixing derived from the flux
pumping of the DC--SQUIDs can provide directional microwave power flow. For a
three--pole filter device, we experimentally demonstrate a directionality
greater than 15 dB over a 600 MHz bandwidth.Comment: 16 pages, 10 figure
1′-Methyl-4′-(4-methylÂphenÂyl)dispiroÂ[1-benzopyran-3(4H),3′-pyrrolidine-2′,3′′-indoline]-2,2′′-dione
In the title compound, C27H24N2O3, the pyrroldine ring adopts a twist conformation, while the six-membered pyranÂone ring of the coumarin ring system is in a sofa conformation. In the crystal, pairs of N—H⋯O hydrogen bonds link the molÂecules into inversion R
2
2(8) dimers. These dimers are further connected via C—H⋯O hydrogen bonds
Effects of steady state free precession parameters on cardiac mass, function, and volumes
G0400444/Medical Research Council/United Kingdom
Wellcome Trust/United Kingdo
Demonstration of Universal Parametric Entangling Gates on a Multi-Qubit Lattice
We show that parametric coupling techniques can be used to generate selective
entangling interactions for multi-qubit processors. By inducing coherent
population exchange between adjacent qubits under frequency modulation, we
implement a universal gateset for a linear array of four superconducting
qubits. An average process fidelity of is estimated for
three two-qubit gates via quantum process tomography. We establish the
suitability of these techniques for computation by preparing a four-qubit
maximally entangled state and comparing the estimated state fidelity against
the expected performance of the individual entangling gates. In addition, we
prepare an eight-qubit register in all possible bitstring permutations and
monitor the fidelity of a two-qubit gate across one pair of these qubits.
Across all such permutations, an average fidelity of
is observed. These results thus offer a path to a scalable architecture with
high selectivity and low crosstalk
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