Link (Germany)

In this article, a method for density tomography using a telecentric BOS setup coupled with a motorized, rotating nozzle will be described. The telecentric optics allow for the disentanglement of the ray path integral and density gradient operators through Leibniz’s integral rule because the rays seen by a telecentric setup are parallel in the Schlieren domain. This enables the usage of a fast gradient inversion solver based on the rotating parallel ray integral method, previously developed by the author, to solve for the ray-integrated density fields in two dimensions for each view individually, producing a set of ray-integrated density measurements similar to a set of images captured by a regular absorption or emission-based computed tomography setup. By leveraging well-known computed tomography algorithms, such as the inverse Radon transform, a tomographic reconstruction of the average density field is quickly found only requiring a simple 2D camera calibration. A demonstration experiment setup is used to test the technique, where a low-speed hot jet produced by different nozzle shapes is measured. The 3D density fields are then converted to temperature fields and the temperatures are compared to a reference measurement with a thermocouple scanner. The strong agreement between the two measurements creates confidence that this technique can be deployed to produce quantitative measurements of the density fields in complex flows, which can be combined with 3D PIV measurements to obtain the four time-averaged thermodynamic fields in compressible jet flows.

Abstract The following paper aims to bring the topics connected testing and emission measurements, together. It provides for the first time an introduction of connected bench testing with the aim to characterize brake particle emissions with a special focus on the impact of regenerative braking.Such an approach should combine the advantages of a brake dynamometer including an emission testing setup and a HiL setup to allow a simplified and much more precise testing of brake particle emissions under the impact of regen braking.It is shown, how significant brake rotor temperatures and as a consequence also emissions can be reduced. Especially the positive effect of emission decrease is astonishing—particle number concentration can be lowered by an order of magnitude, particle mass remains on a tenth of the emission level as it is determined for the case without regen braking.KeywordsConnected testingXiLBrake particle emissionsRegenerative braking

The huge research interest in cellular vehicle-to-everything (C-V2X) communications in recent days is attributed to their ability to schedule multiple access more efficiently as compared to its predecessor technology, i.e., dedicated short-range communications (DSRC). However, one of the foremost issues still remaining is the need for the V2X to operate stably in a highly dynamic environment. This paper proposes a way to exploit the dynamicity. That is, we propose a resource allocation mechanism adaptive to the environment, which can be an efficient solution for air interface congestion that a V2X network often suffers from. Specifically, the proposed mechanism aims at granting a higher chance of transmission to a vehicle with a higher crash risk. As such, the channel access is prioritized to those with urgent needs. The proposed framework is established based on reinforcement learning (RL), which is modeled as a contextual multi-armed bandit (MAB). Importantly, the framework is designed to operate at a vehicle autonomously without any assistance from a central entity, which, henceforth, is expected to make a particular fit to distributed V2X network such as C-V2X mode 4.

\n A soja tolerante ao glufosinato de amônio (Liberty Link ®) foi lançada comercialmente no Brasil na safra 2016/2017, sendo pouco conhecido seu desempenho agronômico e impacto na nodulação e colonização micorrízica arbuscular. O objetivo foi avaliar o esse sistema de produção envolvendo o herbicida glufosinato de amônio nos seguintes aspectos: (i) eficácia de controle de plantas daninhas; (ii) seletividade para a cultura da soja; (iii) impacto dos cultivares de soja e do glufosinato de amônio sobre a nodulação e colonização micorrízica arbuscular. Para isso, foi desenvolvido experimento em campo, em área de produção comercial da cultura, em que tais aspectos foram avaliados em diferentes cultivares de soja (convencional, tolerante ao glifosato ou glufosinato de amônio) e em diferentes manejos de plantas daninhas (com e sem capina, aplicação de 1.440 g e.a. ha-1 de glifosato e 500 g i.a. ha-1 de glufosinato de amônio + 0,5 L ha-1 de óleo vegetal metilado). Foi conduzido experimento em casa de vegetação sobre seletividade dos herbicidas, nas mesmas doses e cultivares transgênicos do experimento em campo. Adicionalmente, foi realizado experimento em condições de casa de vegetação e em laboratório, avaliando a presença de glufosinato de amônio e glutamato na soja tolerante ou sensível ao glufosinato de amônio. Foi possível verificar baixa intoxicação das plantas de soja após aplicação do glufosinato de amônio, com rápida recuperação ao longo dos experimentos. Não houve diferença no controle de plantas daninhas (Alternanthera tenella, Sorghum halepense, Physalis angulata e Parthenium hysterophorus) e na produtividade de soja nos diferentes tratamentos. Pela representação de Draftsman foi possível observar que as espécies A. tenella, P.angulata e P. hysterophorus foram as que mais influenciaram na massa seca da comunidade infestante da cultura. Não houve diferença entre os tratamentos quanto à nodulação. Não se verificou influência da nodulação e micorrização sobre a produtividade. Embora a colonização micorrízica tenha sido significativamente menor na soja tolerante ao glufosinato com aplicação desse herbicida, isso não refletiu em redução da produtividade. Não foram constatados glufosinato de amônio e glutamato nas raízes das plantas que justificasse a diminuição da colonização micorrízica na soja tolerante ao glufosinato devido à aplicação do mesmo. O uso de glufosinato de amônio em soja tolerante ao herbicida, em comparação com outros sistemas utilizados, demonstrou ser seguro e similar à tecnologia tolerante ao glifosato, possibilitando outra opção de ferramenta de manejo de plantas daninhas na cultura da soja, sem interferência na produtividade final dos grãos, especialmente em condições nutricionais adequadas como ocorreu nesse estudo, sendo apenas alertado sobre seu possível impacto negativo na colonização micorrízica arbuscular.\n

The MISE Project (Mediation Information System Engineering) aims at providing collaborating organizations with a Mediation Information System (MIS) in charge of supporting interoperability of a collaborative network. MISE proposes an overall MIS design method according to a model-driven approach, based on model transformations. This MIS is in charge of managing (i) information, (ii) functions and (iii) processes among the information systems (IS) of partner organizations involved in the network. Semantic issues are accompanying this triple objective: How to deal with information reconciliation? How to ensure the matching between business functions and technical services? How to identify workflows among business processes? This article aims first, at presenting the MISE approach, second at defining the semantic gaps along the MISE approach and third at describing some past, current and future research works that deal with these issues. Finally and as a conclusion, the very "design-oriented" previous considerations are confronted with "run-time" requirements.

Flexibility and programmability are key features of open networking platforms to effectively design, develop and assess new Future Internet architectures. This paper introduces a novel framework, based on open source software and PC hardware, that defines all the building blocks necessary to provide a full set of advanced networking capabilities (including QoS support and Traffic Engineering). The framework implementation also takes into account software reuse by facilitating maintenance and customization of the network protocol stack in software routers. The proposed open framework is also available as live distributions, which allow network designers to take advantage of its capabilities with a short learning curve.

Semantic Web Services add features to automate web services discovery and composition. A new standard called SAWSDL emerged recently as a W3C recommendation to add semantic annotations within web service descriptions (WSDL). In order to manipulate such information in Java program we need an XML parser. Two open-source libraries already exist (SAWSDL4J and Woden4SAWSDL) but they don't meet all our specific needs such as support for WSDL 1.1 and 2.0. This paper presents a new tool, called EasyWSDL, which is able to handle semantic annotations as well as to manage the full WSDL description thanks to a plug-in mechanism. This tool allows us to read/edit/create a WSDL description and related annotations thanks to a uniform API, in both 1.1 and 2.0 versions. This document compares these three libraries and presents its integration into Dragon the OW2 open-source SOA governance tool.