A superconducting qubit with Purcell protection and tunable coupling

We present a superconducting qubit for the circuit quantum electrodynamics architecture that has a tunable coupling strength g. We show that this coupling strength can be tuned from zero to values that are comparable with other superconducting qubits. At g = 0 the qubit is in a decoherence free subspace with respect to spontaneous emission induced by the Purcell effect. Furthermore we show that in the decoherence free subspace the state of the qubit can still be measured by either a dispersive shift on the resonance frequency of the resonator or by a cycling-type measurement.Comment: 4 pages, 3 figure

Stability of Diluted Adenosine Solutions in Polyolefin Infusion Bags

Background Intravenous or intracoronary adenosine is used in the cardiac catherization lab to achieve maximal coronary blood flow and determine fractional flow reserve. Objective To determine the stability of adenosine 10 and 50 µg/mL in either 0.9% sodium chloride injection or 5% dextrose injection in polyolefin infusion bags stored at 2 temperatures, refrigeration (2°C-8°C) or controlled room temperature (20°C-25°C). Methods Adenosine 10 µg/mL and 50 µg/mL solutions were prepared in 50 mL polyolefin infusion bags containing 0.9% sodium chloride injection or 5% dextrose injection and stored at controlled room temperature or under refrigeration. Each combination of concentration, diluent, and storage was prepared in triplicate. Samples were assayed using stability-indicating, reversed-phase high-performance liquid chromatography immediately at time 0 and at 24 hours, 48 hours, 7 days, and 14 days. Stability was defined as retaining 90% to 110% of the initial adenosine concentration. The samples were also visually inspected against a light background for clarity, color, and the presence of particulate matter. Results After 14 days, all samples retained 99% to 101% of the initial adenosine concentration. No considerable change in pH or visual appearance was noted. The stability data indicated no significant loss of drug due to chemical degradation or physical interactions during storage. Conclusion Adenosine solutions of 10 and 50 µg/mL were stable for at least 14 days in 50 mL polyolefin infusion bags of 0.9% sodium chloride injection or 5% dextrose injection stored at controlled room temperature and refrigerated conditions

Alien Registration- Blais, Anne M. (Lewiston, Androscoggin County)

https://digitalmaine.com/alien_docs/30253/thumbnail.jp

Tunable joint measurements in the dispersive regime of cavity QED

Joint measurements of multiple qubits have been shown to open new possibilities for quantum information processing. Here, we present an approach based on homodyne detection to realize such measurements in the dispersive regime of cavity/circuit QED. By changing details of the measurement, the readout can be tuned from extracting only single-qubit to only multi-qubit properties. We obtain a reduced stochastic master equation describing this measurement and its effect on the qubits. As an example, we present results showing parity measurements of two qubits. In this situation, measurement of an initially unentangled state can yield with near unit probability a state of significant concurrence.Comment: 4 pages, 4 figure

Alien Registration- Blais, Claire M. (Lewiston, Androscoggin County)

https://digitalmaine.com/alien_docs/30415/thumbnail.jp

Alien Registration- Blais, Anne M. (Lewiston, Androscoggin County)

https://digitalmaine.com/alien_docs/30253/thumbnail.jp

Thermoplastics 3D Printing Using Fused Deposition Modeling on Fabrics

The creation of objects with integrated flexibility is desired and this can be achieved by additive manufacturing on fabric. We propose to use a textile fabric as a flexible joint and create to create an entire object with smaller parts called segments. Such a novel technique will bring integrated flexibility and folded assemblies using extrusion based additive manufacturing machines. The proposed process allows segments to be created flat one at a time on a continuous fabric, which will be suitable for flat to folded assemblies and eliminate size limitations of the 3D printer. Techniques considering object segmentation were used to unfold 3D models of objects into 2D patterns based on paper folding. The unfolding of models was specifically designed to allow manufacturability of the segmentations with no impedance from the 3D printer’s frame, where minimal segments were also desired. Three different textile fabrics based on cotton plain weave, plane weave acrylic, and polyester 200 denier ripstop fabrics were considered in investigations of the interfacial strength created with additively manufactured polylactic acid. Both treated and untreated fabrics were prepared simultaneously so that parts can be printed on top of them at a predefined spatial location. The interfacial strength of additive manufactured parts printed on the fabric were also tested as a function of print process parameters, fiber morphology, fabric properties, as well as surface modification of fabrics. The highest interfacial strength between additive manufactured materials and fabric was desired and tested for. Both adhesion peel testing and stress pull testing is used to determine the strength of the interface between the fabric and deposited additive manufactured parts. Results found that the interfacial strength reached a maximum of 5.18 and 0.435 MPa. For a conceptual square shelter design a series of triangular panels were created on fabric to be assembled into the shelter. It was conceptually determined that the resulting interfacial strength could keep a 40-kilogram large triangular, panel of this shelter, held upside done from removing from the fabric, given its own weight. From this result, it was determined that the interfacial strength is strong enough for use with the creation of large heavy objects that require flexibly in them for hinges. Rough and thick fabrics were found to promote interfacial strength the greatest with higher bed temperatures, this was because of mechanical interlocking being promoted. Pre-treatments of the fabrics were found to help with interfacial strength as well and have potential with higher environmental temperatures, but not as much as mechanical interlocking. Adhesion forces desired between fabric and 3D printed parts can be tailored per specific large object as needed, per segmentation, using this information. The proposed manufacturing method helps fabricate multifaceted large single objects with localized optimum process parameters and objects with integrated flexibility. The additive manufacturing on fabric method of object fabrication addresses the anisotropic nature of additive manufactured parts by allowing parts of the object be created separately from each other. This allows each part to be tailored for specific mechanical properties to achieve desired mechanical properties for the entire object. Mechanical strength, optimization of weight, interfacial strength, specific features or properties, and the ability to fold for storage or transportation of these objects could be tailored per application

Analysis of Connecting Rod Bearing Design Trends Using a Mode-Based Elastohydrodynamic Lubrication Model

Available design trends for big end connecting rod bearings utilize widely adopted rapid methods for prediction of minimum film thickness due to their superior speed and ease of use. However, they impose unrealistic assumptions such as surface rigidity, which could compromise the accuracy of results. The significance of structural elasticity and updated models was investigated using a mode based elastohydrodynamic lubrication model which includes body forces, mass conserving cavitation, and surface roughness. Eight physical connecting rods were modeled using finite element methods and simulated over a variety of conditions, varying engine speed, bearing clearance, and oil viscosity. The results show operating conditions where rapid methods can inaccurately predict minimum film thickness. Bearings operating at higher speeds and loads are subject to significant bearing deformation that influences minimum film thickness predictions. In certain low load conditions oil feed pressure can also have a significant effect on minimum film thickness results. Additionally, current parameters used to characterize bearing performance do not adequately characterize trends that include bearing deformation