Border Frame Research Articles

Super-High-Frequency Bulk Acoustic Resonators Based on Aluminum Scandium Nitride for Wideband Applications.

Despite the dominance of bulk acoustic wave (BAW) filters in the high-frequency market due to their superior performance and compatible integration process, the advent of the 5G era brings up new challenges to meet the ever-growing demands on high-frequency and large bandwidth. Al1-xScxN piezoelectric films with high Sc concentration are particularly desirable to achieve an increased electromechanical coupling (Kt2) for BAW resonators and also a larger bandwidth for filters. In this paper, we designed and fabricated the Al1-xScxN-based BAW resonators with Sc concentrations as high as 30%. The symmetry of the resonance region, border frame structure and thickness ratio of the piezoelectric stack are thoroughly examined for lateral modes suppression and resonant performance optimization. Benefiting from the 30% Sc doping, the fabricated BAW resonators demonstrate a large effective electromechanical coupling (Keff2) of 17.8% at 4.75 GHz parallel resonant frequency. Moreover, the temperature coefficient of frequency (TCF) of the device is obtained as -22.9 ppm/°C, indicating reasonable temperature stability. Our results show that BAW resonators based on highly doped Al1-xScxN piezoelectric film have great potential for high-frequency and large bandwidth applications.

A New Honorific Inscription from Blaundos: Tiberius Claudius Lucius, the Priest of Dionysos Kathegemon

This article introduces the Hellenic honorific inscription on a pedestal found in 2018 in the excavation of the ancient city of Blaundos, within the borders of the village of Sülümenli in the Ulubey district of Uşak province. The pedestal is carved with a border frame around it and was unearthed in the excavation of the main street of the city. It bears an inscription of thirty lines on its front face and a Ludus Duodecim (XII) Scriptorum on its back face, which is understood to have been made later. The inscription provides information about a man named Tiberius Claudius Lucius, a builder, patriot, and benefactor of the city as well as a priest of Dionysos Kathegemon. Further, it records significant information concerning the construction activities he undertook. The erection of the statue was supervised by his nephew Aurelius Claudius Alexandros, of equestrian rank, and the finalization of this task together with the various construction activities openly stated in the inscription were supervised by Aurelius Claudius Alexandros who has the same name as his father, the nephew of Lucius. This inscription is significant for recording information about both the military titles and construction activities in the city. It is dated after AD 212 because of the name Aurelius.

Les Big Data A L’emergence Des Data-Driven- Business-Models: Une Synthese De La Litterature

This paper focuses on presenting a first step in a more in-depth literature review. In the border frame of the ‘systemic’ approach (Donnadieu & Karsky, 2002), the study focused on the exploration of ‘Big Data’ value. It follows the process of the formation of the tax decision (Bensouda, 2009) using some properties of the new network apprehension paradigm (Penard, 2014). This is in line with many approaches of identification of the taxable substance of possession and the transmission of ‘value’ (Jemmar, 2010). Also, it is captured exclusively by the ‘shareholder power’ (Vatteville, 2008), using ‘Data-Driven-Business-Models’ (Hartmann et al., 2014). This business model, however, inspired their "Digital Laborer" (Fisher & Fuchs, 2015) based on an activity whose ‘positive externalities’ (Collin & Colin, 2013) go in the form of a "Cognitive Capital" (Boutang, 2007). "Big Data" is indeed the focus of the growing attention in the literature of different disciplines. In addition, it is at the heart of controversies concerning the apprehension by various "stakeholders" who are central to the development of this concept. Based on preliminary research work, this study is aimed at understanding the different dimensions of this Value in the Moroccan context. It also aims to shed light on why its various ‘stakeholders’ are apprehensive regarding this ‘common good’, which escapes real tax measures that can mitigate the ‘negative externalities’ of this new statistical power (Rouvroy & Berns, 2010).

Reissner–Mindlin shell implementation and energy conserving isogeometric multi‐patch coupling

SummaryA shear‐flexible isogeometric Reissner–Mindlin shell formulation using non‐uniform rational B‐splines basis functions is introduced, which is used for the demonstration of a coupling approach for multiple non‐conforming patches. The six degrees of freedom formulation uses the exact surface normal vectors and curvature. The shell formulation is implemented in an isogeometric analysis framework for computation of structures composed of multiple geometric entities. To enable local model refinement as well as non‐matching domains coupling, a conservative multi‐patch approach using Lagrange multipliers for structured non‐uniform rational B‐splines patches is presented. Here, an additional border frame mesh is used to couple geometries during structural analyses. This frame interface approach avoids the problem of excessive constraints when multiple patches are coupled at one point. First, the shell formulation is verified with several reference cases. Then the influence of the frame interface discretization and frame penalty stiffness on the smoothness of the results is investigated. The effects of the perturbed Lagrangian method in combination with the frame interface approach is shown. In addition, results of models with T‐joint interface connections and perpendicular stiffener patches are presented. Copyright © 2016 John Wiley & Sons, Ltd.

A review of the mechanical properties of beetle elytra and development of the biomimetic honeycomb plates

This paper reviews the mechanical properties of beetle elytra. (1) The elytra has a lightweight border frame structure and has an optimal design, which includes variable cross-sections suitable for different positions and enables the required moment of inertia needed for flight. (2) Due to the non-equiangular, laminated structure of the elytra, there are two types of tensile fracture morphologies: fiber breakage and residual bridging. This study demonstrates the anisotropy and the effectiveness of the elytra’s tensile strength by analyzing the orientations of the fibers. (3) The trabecular structure can be used to efficiently improve the peel resistance of the laminated composites, and its three-dimensional strengthening mechanisms have been clarified. (4) A mystery contained in the beetle elytron structures and its biological meanings are revealed, and a biomimetic application example is given. Based on the above points, possible directions for future work are also indicated in this paper.

Biomimetic Studies of the Beetle Forewing in China

This report reviews biomimetic studies performed in China on the beetle forewing, noting that Chinese scholars studying bionics have substantially advanced various branches of biomimetic research in beetles. The report also proposes the development of branches of bionic research and establishes the foundation for corresponding experiments and theories. Then, using theA. dichotomaforewing as a an example, the cross-sectional shape, orientation of the laminated fiber layers, structure of the trabeculae, and respective mechanical properties of the forewing, as well as their biological significance, are reviewed. 1) The forewing has a lightweight border frame structure and an optimal design of variable cross-sections suitable for different positions, which achieves the specific second moment of inertia required for flight. 2) Due to the non-equiangular, laminated structure of the forewing, there are two types of tensile fracture morphologies: fiber breakage and residual bridging. This study demonstrates the anisotropy and the effectiveness of the forewings tensile strength by analyzing the orientation direction of the fibers. 3) The trabecular structure can be used to efficiently improve the peel resistance of the laminated composites. Based on the above points, possible directions for future work are also indicated in this paper.

Framing Migration

In this article, we review the terms of reference by the Expert Panel on Asylum Seekers (the Panel) to unpack the framing of asylum specifically but irregular migration generically, finding that the interaction of the terms humanitarianism, security and economic development provide the discursive means to limit their separate ‘in-the-know’ or ‘in-politics’ meaning. In particular, neo-liberal politics and liberal internationalism restrict the range of meanings assigned to these terms, making security the limit of the humanitarian impulse and economic identity the limit of development. We interrogate the deployment of the concepts of economic development and humanitarian security as two parergons of the border frame, acting as pincers of what is to be deemed suitable for discussion within the policy frame (in-politics). Drawing upon Alexander Betts' concept of ‘targeted development assistance’, we argue that the assertion of Australia's border is consistent not only with its parsed state-making memory but also with an international system in which a certain reading of liberal idealism and realism squeezes the play of meaning into which policy is deemed ‘reasonable’.

Department of Culture, Media and Sport's Peer Review Pilot

April 2009 saw the publication of the documents generated by the UK Department of Culture, Media and Sport's museum Peer Review Pilot. This Policy Review offers both an overview of the process and a conceptual critique both of the Peer Review Pilot and the McMaster Review criteria on which the pilot was based. It is argued that the McMaster Review is grounded on a reading of excellence as “life-changing experiences” predicated on an imagined transformative aesthetic moment and that it is only by defining excellence in this way that McMaster could secure peer review as a legitimate means of identifying excellence. When transferred for the purposes of the Peer Review Pilot to the museum sector – with its long traditions of pedagogic and civic reform – this narrow reading of “changing lives” is no longer sustainable. The dislodging of the McMaster grounding assumption within the practice of the Peer Review Pilot creates conceptual fissures that can be traced throughout the Pilot's documentation. Specifically, a reading of the Pilot suggests both a need for a more careful reading of “peer”, a recognition of museums' multiple lines of accountability (including to the public) and the ongoing need for methodologies that might allow for an understanding of “life changing” within a much border frame.

La Preparatoria Bowie versus la Patrulla Fronteriza

Chicano and immigrant students at a school in El Paso, Texas, with support from community members, educators, civic organizations, and MEChA, successfully confronted the U.S. Border Patrol in a federal court of law. The 1992 legal case and federal interdiction policy on the border frame the analysis of the subaltern position of the plaintiffs and their ability to generate a border transformative pedagogy applicable to a transnational entity. Their journey to emancipation is examined using interviews, analysis of documentary footage, news reports, direct trial observations, and analysis of the legal proceedings.

Scale Model Investigation on the Influence of Boundary Conditions on the Airborne Sound Insulation of Lightweight Double Walls

Sound reduction index measurements were performed inside a 1:10 scale model of two adjoining rooms of a test facility in an acoustic laboratory, with the aim of investigating the influence of the boundary conditions on the acoustic performance of lightweight double walls. The model was built entirely of polymethyl methacrylate (PMMA). The specimen double walls were built using the same acrylic material. At first, measurements were performed on a single homogeneous panel, in order to check the reliability of the whole procedure and the repeatability of the measurements. A good correspondence was found between theoretically calculated values and measured values of the sound reduction index above the critical frequency. A second set of measurements was carried out on model double walls comprising two leaves, connected to each other only by a border frame running along the whole wall perimeter. It was found that the effect of the border frame is a reduction of the performance of the double wall, to under that of a single plate with the same total surface mass. A third set of measurements was carried out inserting vertical studs to connect the two leaves. It was found that the presence of the studs causes a general decrease of the sound reduction index values and a decomposition of the critical frequency. A fourth set of measurements was carried out on the same double wall using border frames made of different materials. The experimental results show that damped materials (wood, rubber) give a better performance than rigid materials (acrylic, aluminium).

Variability in frame by frame analysis of left ventricular wall motion from contrast angiograms.

Measurement of the timing of left ventricular (LV) wall motion, of asynchrony, and of diastolic function from contrast angiograms requires delineation of the endocardial border frame by frame through the cardiac cycle. This study was performed to determine the magnitude of intraobserver and interobserver variability in manual border tracing, and to measure the impact of this variability on the derived functional parameters. The contrast ventriculograms of 25 patients with coronary artery disease (CAD) or with normal coronary arteries were analyzed frame by frame, by two observers or twice by the same observer. Motion was measured using the centerline method at each twelfth of systole and of diastole. Variability was calculated as the absolute difference between repeated measurements of: wall motion, asynchrony, and the time at which each region of the LV reached 10%, 50%, and 100% of peak contraction, and 50% of filling. Intraobserver and interobserver variability in wall motion were similar, and varied with time in the cycle, and with location on the LV contour. Variability was highest at end systole, when it averaged 8% of the normal mean for wall motion. Variability in timing was highest at peak contraction; however, the variability in measuring asynchrony averaged only 18 msec. Analysis of the magnitude and synchrony of regional LV wall motion through the cardiac cycle from contrast ventriculograms can be performed with reproducibility comparable to that at end systole.