Abstract Additively manufactured lattice structures are popular due to their desirable properties, such as high specific stiffness and surface area, being explored for several applications including aerospace components, heat exchangers biomedical implants. The complexity of lattices challenges the fabrication limits additive manufacturing processes thus, particularly prone defects. This paper presents a review defects in produced by powder bed fusion processes. focuses on effects design...

We report magnetic and electrical measurements of Nb Josephson junctions with strongly ferromagnetic barriers Co, Ni, ${\mathrm{Ni}}_{80}{\mathrm{Fe}}_{20}$ (Py). All these materials show multiple oscillations critical current a barrier thickness implying repeated 0-$\ensuremath{\pi}$ phase transitions in the superconducting order parameter. show, particular, that Co devices can be accurately modeled using existing clean limit theories that, despite high exchange energy (309 meV), large...

We report a systematic study of Nb/ferromagnet (FM)/Nb trilayer structures in which the FM layer is one strong ferromagnets Co, Fe, Ni, and ${\mathrm{Ni}}_{80}{\mathrm{Fe}}_{20}(\mathrm{Py})$. Accurate control thickness has enabled detailed studies magnetic transport properties superconducting state. In all cases, we estimate dead exchange energies ferromagnetic layers; doing so, demonstrate inconsistencies between derived elsewhere from superconductor (S)/FM bilayer experiments S/FM/S...

We investigate the localization of two incoherent point sources with arbitrary angular and axial separations in paraxial approximation. By using quantum metrology techniques, we show that a simultaneous estimation is achievable by single measurement, precision saturating ultimate limit stemming from Cram\'er-Rao bound. Such not degraded subwavelength regime, thus overcoming traditional limitations classical direct imaging derived Rayleigh's criterion. Our results are qualitatively...

The quantum Fisher information matrix is a central object in multiparameter estimation theory. It usually challenging to obtain analytical expressions for it because most calculation methods rely on the diagonalization of density matrix. In this paper, we derive general which bypass and do not require expansion operators an orthonormal set states. Additionally, can tackle matrices arbitrary rank. presented here simplify calculations considerably when, example, more naturally expressed terms...

Precision object handling and manipulation require the accurate positioning of industrial robots. A common practice for performing end effector is to read joint angles use robot forward kinematics (FKs). However, FKs rely on Denavit-Hartenberg (DH) parameter values, which include uncertainties. Sources uncertainty associated with mechanical wear, manufacturing assembly tolerances, calibration errors. It therefore necessary increase accuracy DH values reduce impact uncertainties FKs. In this...

Abstract Rotationally symmetric components (such as gears and axels) are ubiquitous to modern devices, their precision manufacture is necessary keep costs time down, well reduce waste possibly hazardous component failure. The manufacturing errors, which affect the shape in rotation axis, grouped together into common term “runout". Here we present a potential updated standard for characterising runout of rotationally machined parts three-dimensions, evaluated using virtual instrumentation,...

Highly accurate positioning of industrial robots is crucial to performing operations with high quality. This paper presents a mechanical modification an robot aiming at enhancing the system actuation resolution, thereby its positional accuracy. The under consideration six-degrees freedom (DoF) revolute joints. By integrating linear stage, prismatic joint introduced robot’s end effector, reconfiguring it into 7 DoF more precise step size capabilities. To improve accuracy overall system,...

By using sub-millimetre laser speckle pattern projection we show that photogrammetry systems are able to measure smooth three-dimensional objects with surface height deviations less than 1 μm. The of patterns allows correspondences on the spheres be found, and as a result, verification artefacts low were measured. A combination VDI/VDE ISO standards also utilised provide complete method, determine quality parameters for system under test. Using proposed method applied system, 5 mm radius...

Additively manufactured parts are fabricated by generating complex shapes, allowing almost infinite freedom of design. Such present significant measurement challenges related to the accessibility and quality results, due presence hollow features, freeform geometries. Optical measuring instruments being increasingly applied for form measurement, because, compared contact measurements, they feature higher speeds, point densities often better capabilities access recessed regions. In this paper,...

Strut-based lattice structures produced by powder bed fusion are prone to characteristic manufacturing defects that alter both their form and surface texture. Most studies in the literature focus on a subset of commonly observed defects, typically radius variation strut waviness; remain relatively unexplored. Furthermore, there remains need for development general finite element modelling framework can implement range into any strut-based design. This paper presents implementing meshes...

We investigate the spin polarization of ferromagnetic semiconductor (Ga,Mn)As by point-contact Andreev reflection spectroscopy. The conductance spectra are analyzed using a recent theoretical model that accounts for momentum- and spin-dependent scattering at interface. This allows us to fit data without resorting, as in case standard Blonder-Tinkham-Klapwijk (BTK) model, an effective temperature or statistical distribution superconducting gaps. find transport...

Coherence scanning interferometry (CSI) is a widely used optical method for surface topography measurement of industrial and biomedical surfaces. The operation CSI can be modeled using approximate physics-based approaches with minimal computational effort. A critical aspect modeling defining the transfer function imaging properties instrument to predict interference fringes from which information extracted. Approximate methods, example, elementary Fourier optics, universal foil models, use...

We have performed point contact spectroscopy measurements on a sample constituted by metallic ferromagnetic oxide (SrRuO_3) bottom electrode and tunnel ferrimagnetic (CoFe_2O_4) barrier. Andreev reflection is observed across the From comparison of in SrRuO3 CoFe_2O_4 barrier we infer that has spin filter efficiency not larger than +13%. The observation moderate positive filtering discussed context microstructure barriers symmetry-related effects.

We investigate the genuine multipartite nonlocality of three-mode Gaussian states continuous variable systems. For pure states, we present a simplified procedure to obtain maximum violation Svetlichny inequality based on displaced parity measurements, and analyze its interplay with tripartite entanglement measured via Rényi-2 entropy. The admits tight upper lower bounds at fixed entanglement. mixed no is possible when purity falls below 0.86. also explore set recently derived weaker...

In this paper we show that, by using a photogrammetry system with and without laser speckle, large range of additive manufacturing (AM) parts different geometries, materials post-processing textures can be measured to high accuracy. AM test artefacts have been produced in three materials: polymer powder bed fusion (nylon-12), metal (Ti-6Al-4V) material extrusion (ABS plastic). Each artefact was then the both normal speckle projection modes resulting point clouds compared CAD model. The...

Abstract Manufacturing has recently experienced increased adoption of optimised and fast solutions for checking product quality during fabrication, allowing manufacturing times costs to be significantly reduced. Due the integration machine learning algorithms, advanced sensors faster processing systems, smart instruments can autonomously plan measurement pipelines, perform decisional tasks trigger correctional actions as required. In this paper, we summarise state art in optical metrology,...

Abstract : Real world data fusion systems process at the lowest level and combine to a usable form for human highest level. The functional role of system is provide timely accurate user. focus this paper address user needs based on ontological principles becoming versus historical opposite being. Ontology question existence world, but also equally important in philosophical argument that an epistemology - or set rules. We explore higher-level purpose by setting up emphasizing rules guide...

Additive manufactured parts have complex geometries featuring high slope angles and occlusions that can be difficult or even impossible to measure; in this scenario, photogrammetry presents itself as an attractive, low-cost candidate technology acquire digital form data. In paper, we propose a pipeline optimise, automate accelerate the photogrammetric measurement process. The first step is detect optimum camera positions which maximise surface coverage quality, while minimising total number...