Introducing the 3DCityDB-Tools Plug-In for QGIS

This paper introduces a new plug-in for QGIS that allows to connect to the free and open-source 3D City Database to load CityGML data, structured as classic GIS layers, into QGIS. The user is therefore not required to be a CityGML specialist, or a SQL expert, as the plug-in takes care of hiding from the user most of the complexity in terms of...

System Architecture Optimization: An Open Source Multidisciplinary Aircraft Jet Engine Architecting Problem

View Video Presentation: https://doi-org.tudelft.idm.oclc.org/10.2514/6.2021-3078.vid<br/><br/>Decisions regarding the system architecture are important and taken early in the design process, however suffer from large design spaces and expert bias. Systematic design space exploration techniques, like optimization, can be applied to system...

A mbse approach to mdao systems for the development of complex products

The research and innovation AGILE project has developed an approach, the so-called AGILE Paradigm, focusing on the acceleration of the deployment and operation of collaborative Multidisciplinary Design Analysis Optimization systems, which in turns can be exploited to accelerate the development of complex products, such as novel aerospace...

Immediate versus delayed removal of urinary catheter after laparoscopic hysterectomy: A randomised controlled trial

Objective: To evaluate if immediate catheter removal (ICR) after laparoscopic hysterectomy is associated with similar retention outcomes compared with delayed removal (DCR). Study design: Non-inferiority randomised controlled trial. Population: Women undergoing laparoscopic hysterectomy in six hospitals in the Netherlands. Methods: Women were...

CityGML Application Domain Extension (ADE): overview of developments

The Application Domain Extension (ADE) is a built-in mechanism of CityGML to augment its data model with additional concepts required by particular use cases. The goal of this paper is to provide an overview of the ADE mechanism and a literature review of developments since its introduction a decade ago. The discovery of publications found that...

Proposal for a new LOD and multi-representation concept for CityGML

The Open Geospatial Consortium (OGC) CityGML standard offers a Level of Detail (LoD) concept that enables the representation of CityGML features from a very detailed to a less detailed description. Due to a rising application variety, the current LoD concept seems to be too inflexible. Here, we present a multi representation concept (MRC) that...

Jamming in finite systems: Stability, anisotropy, fluctuations, and scaling

Athermal packings of soft repulsive spheres exhibit a sharp jamming transition in the thermodynamic limit. Upon further compression, various structural and mechanical properties display clean power-law behavior over many decades in pressure. As with any phase transition, the rounding of such behavior in finite systems close to the transition...

Implementation of a heterogeneous, variable-fidelity framework for flight mechanics analysis in preliminary aircraft design

Dynamic behavior of tunnel elements during the immersion process

Global Local Structural Optimization of Transportation Aircraft Wings

The study presents a multilevel optimization methodology for the preliminary structural design of transportation aircraft wings. A global level is defined by taking into account the primary wing structural components (i.e., ribs, spars and skin) which are explicitly modeled by shell layered finite elements. Wing substructures such as stringers...

Influence of the dielectric substrate on the terahertz electric near-field of a hole in a metal

We have studied theoretically and experimentally the influence of a dielectric substrate on the frequency-dependent terahertz electric near-field of a small hole in a metal layer. We find that the near-field transmission spectrum and the two-dimensional field distribution of an empty hole in a thin metal layer on a substrate are almost identical...

Terahertz Near-Field Vectorial Imaging of Subwavelength Apertures and Aperture Arrays

We present measurements of the complete terahertz (THz) electric near-field distribution, Ex, Ey and Ez, in both the time- and frequency-domains, for subwavelength apertures and subsections of subwavelength aperture arrays. Measuring the individual components of the THz near-field with subwavelength spatial resolution, as they emerge from these...

A comparison of coincident GRACE and ICESat data over Antarctica

In this study, we present a comparison of coincident GRACE and ICESat data over Antarctica. The analysis focused on the secular changes over a 4-year period spanning from 2003 to 2007, using the recently reprocessed and publicly available data sets for both missions. The results show that the two independent data sets possess strong spatial...

Advanced terahertz electric near-field measurements at sub-wavelength diameter metallic apertures: Erratum

An erratum is presented to correct an error in the discussion section of [Opt. Express. 16, 7407-7417 (2008)] and to add a relevant reference on earlier work.

Advanced terahertz electric near-field measurements at sub-wavelength diameter metallic apertures

Using terahertz-light excitation, we have measured with sub-wavelength spatial, and sub-cycle temporal resolution the time- and frequency-dependent electric-field and surface-charge density in the vicinity of small metallic holes. In addition to a singularity like concentration of the electric field near the hole edges, we observe, that holes...

Environmental quality in the supply chain of an original equipment manufacturer in the electronics industry: Research, development, evaluation, validation and implementation of environmental performance tools in the scope of total cost of ownership