23 research outputs found
Influence of end milling process parameters on micro-hardness of LM25 aluminium alloy
The surface integrity of the machined component plays a vital role on the mechanical property of aluminium alloys. This research focused on developing an analytical model in order to predict the changes in micro-hardness and microstructure of LM25 aluminium alloy Design of experiment (DOE) was adopted for determining the effect of end milling process parameters such as cutting speed (Cs), feed rate (f ) and axial depth of cut (ap) on arithmetic average micro-hardness (MH). The micro-hardness of the samples is tested with vicker’s hardness tester. Desirability approach gives better accuracy of the result and the capability of predicting cutting process parameters. The optimum machining setting for single-objective optimization corresponds to Cs (81, 86 m/min), f(0,058 mm/rev), ap(2,78 mm) gives higher value of MH (134,2 HV)
Entanglement preservation in tripartite quantum systems under dephasing dynamics
Protecting entanglement from decoherence is a critical aspect of quantum
information processsing. For many-body quantum systems evolving under
decoherence, estimating multipartite entanglement is challenging. This
challenge can be met up by considering distance based measure such as relative
entropy of entanglement which decisively measures entanglement in both pure as
well as mixed states. In this work, we investigate the tripartite entanglement
dynamics of pure and mixed states in the presence of a structured dephasing
environment at finite temperature. We show that the robustness of the quantum
system to decoherence is dependent on the distribution of entanglement and its
relation to different configurations of the bath. If the bath is structured
individually such that each qubit has its own environment, the system has
different dynamics compared to when the bath is common to all the three qubits.
From the results we conjecture that there is a connection between the
distribution of entanglement among the qubits and the distribution of bath
degrees of freedom, and the interplay of these two distributions determines the
decay rate of the entanglement dynamics. The sustainability of tripartite
entanglement is shown to be enhanced significantly in presence of reservoir
memory.Comment: 4 figure
Reducing Rydberg state dc polarizability by microwave dressing
We demonstrate reduction of the dc polarizability of Cesium atom Rydberg
states in a 77 K environment utilizing microwave field dressing. In particular
we reduce the polarizability of states which have resonances at
5.35 GHz to , suitable for interfacing Rydberg atoms to
superconducting resonators in a cryogenic environment. We measure the
polarizability of the Rydberg states using Magneto-Optical-Trap (MOT) loss
spectroscopy. Using an off-resonant radio-frequency (RF) dressing field
coupling and we demonstrate a reduction in dc
polarizability of the states over 80. Experimental findings
are in good agreement with a numerical model of the atom-dressing field system
developed using the Shirley-Floquet formalism. We also demonstrate that the dc
polarizability reduction is highly anisotropic, with near total nulling
possible when the dc and dressing fields are aligned, but only a factor of two
reduction in polarizability when the fields are orthogonal. These results may
aid in stabilizing Rydberg resonances against varying dc fields present near
surfaces, enabling advancement in the development of hybrid Rydberg atom -
superconducting resonator quantum gates
Mid-circuit measurements on a single species neutral alkali atom quantum processor
We demonstrate mid-circuit measurements in a neutral atom array by shelving
data qubits in protected hyperfine-Zeeman sub-states while non-destructively
measuring an ancilla qubit. Measurement fidelity was enhanced using microwave
repumping of the ancilla during the measurement. The coherence of the shelved
data qubits was extended during the ancilla readout with dynamical decoupling
pulses, after which the data qubits are returned to mf = 0 computational basis
states. We demonstrate that the quantum state of the data qubits is well
preserved up to a constant phase shift with a state preparation and measurement
(SPAM) corrected process fidelity of F = 97.0(5)%. The measurement fidelity on
the ancilla qubit after correction for state preparation errors is F = 94.9(8)%
and F = 95.3(1.1)% for |0> and |1> qubit states, respectively. We discuss
extending this technique to repetitive quantum error correction using
quadrupole recooling and microwave-based quantum state resetting.Comment: v3: additional appendices with fidelity analysis adde
Pancreatic Lipase inhibition assay of various extracts of leaves of Murraya Koenigii in southern areas of Goa
The objective of the study was to assess the lipase inhibitory activities of chloroformic, methanolic and aqueous extracts from the commonly available
Murraya koenigii (L.) Spreng leaves(Rutaceae) in southern villages of Goa, for potential use in the treatment of obesity. Extracs of the leaves of this plant were evaluated for lipase inhibitory activity using porcine pancreatic lipase (PPL: triacylglycerol lipase) and p-nitrophenyl butyrate in an in vitro assay. Among the three extracts screened, chloroformic extract exhibited the highest pancreatic lipase inhibitory activity of 53.42%, followed by methanolic extract (51.88%) and aqueous extract (36.42%), respectively. Chloroformic extract has not been screened for its pancreatic lipase inhibition assay. All the Crude extracts of leaves of Murraya koenigii (L.) Spreng leaves (Rutaceae) have potential as pancreatic lipase inhibitory agents. . Chloroformic extract was found to be most effective and hence can be used as a potent anti-obesity agent to combat hyperlipidemia
Influence of end milling process parameters on micro-hardness of LM25 aluminium alloy
The surface integrity of the machined component plays a vital role on the mechanical property of aluminium alloys. This research focused on developing an analytical model in order to predict the changes in micro-hardness and microstructure of LM25 aluminium alloy Design of experiment (DOE) was adopted for determining the effect of end milling process parameters such as cutting speed (Cs), feed rate (f ) and axial depth of cut (ap) on arithmetic average micro-hardness (MH). The micro-hardness of the samples is tested with vicker’s hardness tester. Desirability approach gives better accuracy of the result and the capability of predicting cutting process parameters. The optimum machining setting for single-objective optimization corresponds to Cs (81, 86 m/min), f(0,058 mm/rev), ap(2,78 mm) gives higher value of MH (134,2 HV)
Pancreatic Lipase inhibition assay of various extracts of leaves of Murraya Koenigii in southern areas of Goa
The objective of the study was to assess the lipase inhibitory activities of chloroformic, methanolic and aqueous extracts from the commonly available
Murraya koenigii (L.) Spreng leaves(Rutaceae) in southern villages of Goa, for potential use in the treatment of obesity. Extracs of the leaves of this plant were evaluated for lipase inhibitory activity using porcine pancreatic lipase (PPL: triacylglycerol lipase) and p-nitrophenyl butyrate in an in vitro assay. Among the three extracts screened, chloroformic extract exhibited the highest pancreatic lipase inhibitory activity of 53.42%, followed by methanolic extract (51.88%) and aqueous extract (36.42%), respectively. Chloroformic extract has not been screened for its pancreatic lipase inhibition assay. All the Crude extracts of leaves of Murraya koenigii (L.) Spreng leaves (Rutaceae) have potential as pancreatic lipase inhibitory agents. . Chloroformic extract was found to be most effective and hence can be used as a potent anti-obesity agent to combat hyperlipidemia