scholarly journals Endoscopic Pan/Tilt Camera for Thorax Interventions – Design and first results

2019 ◽  
Vol 5 (1) ◽  
pp. 517-519
Author(s):  
Alexander Mrokon ◽  
Peter P. Pott ◽  
Volker Steger
Keyword(s):  
Minimally Invasive ◽  
Inclination Angle ◽  
Magnetic Circuit ◽  
Mechanical Stability ◽  
Fem Simulation ◽  
Camera System ◽  
Design Changes ◽  
First Results ◽  
Set Up ◽  
Future Work

AbstractMinimally invasive surgery in some cases suffers from a limited view because certain areas are obscured by others. In this paper, a system is described, which can be used in minimally invasive procedures as an addition to a standard endoscope to improve the range of view. Through FEM simulation a magnetic circuit was designed to position the camera head. Subsequently, a camera positioning system was set up that includes an extracorporeal and an intracorporeal unit. The first controls the intracorporeal system. The latter has a camera inclination angle of up to 65° and an additional vertically downward viewing angle when aligned in parallel (inclination angle 0°). The panning angle is 360°. The camera system was evaluated in lab and cadaver trials. It has been found that the size of the intracorporeal system (16 × 10 × 150 mm) represents a major problem. Future work will focus of the reduction of the system’s size, the improvement of the camera image quality, and design changes considering mechanical stability.

Tracking a Wave Power Buoy Using a Network Camera: System Analysis and First Results

2009 ◽  
Author(s):  
Simon Tyrberg ◽  
Halvar Gravrakmo ◽  
Mats Leijon
Keyword(s):  
Motion Tracking ◽  
System Analysis ◽  
Two Dimensions ◽  
Observation System ◽  
Camera System ◽  
Swedish West Coast ◽  
Motion Data ◽  
First Results ◽  
Set Up ◽  
Network Camera

An observation system has been set up on a small islet on the Swedish west coast. The purpose of the system is to monitor the wave buoys in The Lysekil Project. The project is an attempt to harvest wave energy using linear generators and point absorbing buoys. The observation system is self-sufficient and uses a network camera to follow the buoy motions. The first results from the camera, which has been operating since July 2008, have been analyzed to examine the motion tracking capabilities of the system. The motion tracking would work as a complement to the other measurements that are being done on the buoy. The method for extracting motion data from the two-dimensional pictures is presented. The results are graphs of translative buoy motion in two dimensions, and rotational motion about two different axes. The vertical buoy motion for the studied sequence is in the range of ±0.5 m.

scholarly journals PRECISE LASER-BASED OPTICAL 3D MEASUREMENT OF WELDING SEAMS UNDER WATER

2015 ◽  
Vol XL-5/W5 ◽  
pp. 117-122 ◽  
Author(s):  
T. Ekkel ◽  
J. Schmik ◽  
T. Luhmann ◽  
H. Hastedt
Keyword(s):  
Surface Topography ◽  
High Accuracy ◽  
3D Measurement ◽  
Camera System ◽  
Testing Procedures ◽  
System Components ◽  
First Results ◽  
Surface Measurements ◽  
Set Up ◽  
Test Objects

This paper deals with the development of a measuring procedure and an experimental set-up (stereo camera system in combination with a projecting line laser and a positioning unit) which are intended to detect the surface topography, particularly of welds, with high accuracy in underwater environments. The system concept makes provision for the fact that the device can be positioned in space and manipulated by hand. The development, optimization and testing of the system components for surface measurements as well as calibration and accuracy evaluations are the main objectives within this research project. Testing procedures and probes are constructed and evaluated to verify the results. First results will be shown, where the test objects are underwater. The development considers conditions for a future adaption to underwater use.

First results of a new hyperspectral camera system for chemical based wound analysis

2015 ◽  
Vol 10-11 ◽  
pp. 17-22 ◽  
Author(s):  
Jörg Marotz ◽  
Apostolos Siafliakis ◽  
Amadeus Holmer ◽  
Axel Kulcke ◽  
Frank Siemers
Keyword(s):  
Camera System ◽  
First Results ◽  
Hyperspectral Camera

A Biodegradable Stent Based on Poly(L-Lactide) and Poly(4-Hydroxybutyrate) for Peripheral Vascular Application: Preliminary Experience in the Pig

2007 ◽  
Vol 14 (5) ◽  
pp. 725-733 ◽  
Author(s):  
Carsten Michael Bünger ◽  
Niels Grabow ◽  
Katrin Sternberg ◽  
Martin Goosmann ◽  
Klaus-Peter Schmitz ◽  
...  
Keyword(s):  
Vascular Injury ◽  
Mechanical Stability ◽  
Vascular Trauma ◽  
Metal Stents ◽  
Peripheral Vascular ◽  
Abdominal Incision ◽  
Biodegradable Stent ◽  
Balloon Catheters ◽  
Future Work

Purpose: To assess the technical feasibility and biocompatibility of a novel stent based on poly(L-lactide) (PLLA) and poly(4-hydroxybutyrate) (P4HB) for peripheral vascular applications. Methods: A polytetrafluoroethylene aortobi-iliac graft was implanted in 5 pigs through a midline abdominal incision. After transverse graft limb incision, 5 PLLA/P4HB stents and 5 metal stents (316L stainless steel) were randomly deployed at both iliac anastomotic sites with 6-mm balloon catheters. Angiography was performed to determine patency prior to sacrifice at 6 weeks. Stented segments were surgically explanted and processed for quantitative histomorphometry. Vascular injury and inflammation scores were assigned to the stented iliac segments. Results: No animals were lost during follow-up. All PLLA/P4HB stents were deployed within 2 minutes by balloon inflation to 8 bars without rupture of the stent struts or anastomotic suture. All stents were patent on postprocedural angiography. Histological analysis showed no signs of excessive recoiling or collapse. PLLA/P4HB stents demonstrated decreased residual lumen area and increased neointimal area after 6 weeks (12.27±0.62 and 8.40±1.03 mm2, respectively) compared to 316L stents (13.54±0.84 and 6.90±1.11 mm2, respectively) as the result of differences in stent areas (PLLA/P4HB: 4.31±0.15 mm2; 316L: 2.73±0.29 mm2). Vascular injury scores showed only mild vascular trauma for all stents (PLLA/P4HB: 0.41±0.59; 316L: 0.32±0.47). Inflammatory reaction was slightly higher around PLLA/P4HB stent struts (1.39±0.52) compared to 316L (1.09±0.50). Conclusion: Rapid balloon expansion of PLLA/P4HB stents is feasible without risk of strut rupture. PLLA/P4HB stents provide adequate mechanical stability after iliac anastomotic stenting in pigs. Smaller residual luminal areas in the PLLA/P4HB stents might have been caused by tissue ingrowth into the larger strut interspaces due to higher strut thickness (stent area) in this group. This limitation needs to be addressed in future work on the stent design.

scholarly journals Effect of sowing density and nitrogen top-dress fertilisation on growth and yield of chia (Salvia hispanica L.) in a Mediterranean environment: first results

2015 ◽  
Vol 10 (3) ◽  
pp. 163 ◽  
Author(s):  
Rocco Bochicchio ◽  
Roberta Rossi ◽  
Rosanna Labella ◽  
Giovanni Bitella ◽  
Michele Perniola ◽  
...  
Keyword(s):  
Southern Italy ◽  
Plant Density ◽  
Fruit Production ◽  
Growth And Yield ◽  
Leaf Production ◽  
Salvia Hispanica ◽  
Area Index ◽  
First Results ◽  
Salvia Hispanica L ◽  
Set Up

The demand for sources of nutraceuticals has led to the rediscovery and diffusion of traditional crops such as chia (<em>Salvia hispanica</em> L.), whose leaves and fruits are rich in W3 fatty acids and anti-oxidants. Chia originates in Central America but it is rapidly expanding to new areas. A field experiment conducted at Atella in Basilicata (Southern Italy) was set up to test the response of chia to N top-dress fertilisation (0 and 20 kg ha<sup>–1</sup>) and to sowing density (D1=125, D2=25, D3=8 and D4=4 plants m<sup>–2</sup>) in a split-plot design with three replications. First results show maximum leaf area index values up to 7.1 and fresh vegetative biomass production at early flowering ranging between 50.87 (D4) and 59.71 (D1) t ha<sup>–1</sup>. Yield increased with plant density: a significantly (P&lt;0.01) higher production (398 kg ha<sup>–1</sup>) was reached in D1. N top-dressing had a detrimental effect on yield and corresponded to higher lodging and lower maturation percentage of seeds, though non-significant. Based on our first results it seems worthwhile to continue agronomical trials for chia in herbaceous systems of southern Italy for leaf production based on traditional genotypes, while fruit production might be pursued by adopting high sowing density and the search for longer-day genotypes.

scholarly journals FIRST STEPS TOWARDS AN INTEGRATED CITYGML-BASED 3D MODEL OF VIENNA

2016 ◽  
Vol III-4 ◽  
pp. 139-146 ◽  
Author(s):  
G. Agugiaro
Keyword(s):  
Energy Use ◽  
Smart Cities ◽  
Three Dimensional ◽  
3D City Model ◽  
First Results ◽  
Sustainable Energy Systems ◽  
City Model ◽  
Set Up ◽  
The City ◽  
City Models

This paper presents and discusses the results regarding the initial steps (selection, analysis, preparation and eventual integration of a number of datasets) for the creation of an integrated, semantic, three-dimensional, and CityGML-based virtual model of the city of Vienna. CityGML is an international standard conceived specifically as information and data model for semantic city models at urban and territorial scale. It is being adopted by more and more cities all over the world. &lt;br&gt;&lt;br&gt; The work described in this paper is embedded within the European Marie-Curie ITN project “Ci-nergy, Smart cities with sustainable energy systems”, which aims, among the rest, at developing urban decision making and operational optimisation software tools to minimise non-renewable energy use in cities. Given the scope and scale of the project, it is therefore vital to set up a common, unique and spatio-semantically coherent urban model to be used as information hub for all applications being developed. This paper reports about the experiences done so far, it describes the test area and the available data sources, it shows and exemplifies the data integration issues, the strategies developed to solve them in order to obtain the integrated 3D city model. The first results as well as some comments about their quality and limitations are presented, together with the discussion regarding the next steps and some planned improvements.

scholarly journals PENGEMBANGAN WIKI KAMPUS SEBAGAI MEDIA PENGETAHUAN KOMUNITAS DI PERPUSTAKAAN PERGURUAN TINGGI

2017 ◽  
Vol 5 (1) ◽  
pp. 29
Author(s):  
Abdurrakhman Prasetyadi ◽  
Danang Dwijo Kangko ◽  
D.W. Ari Nugroho
Keyword(s):  
Data Flow ◽  
Flow Diagram ◽  
Web Content ◽  
Knowledge Communities ◽  
University Library ◽  
First Results ◽  
Data Flow Diagram ◽  
Online Encyclopedia ◽  
Set Up ◽  
The University

<p>This study aims to: (1) create category of knowledge communities in university library, (2) designing the prototype of an online encyclopedia of knowledge communities in the university library, and (3) testing a prototype of an online encyclopedia of knowledge communities. The method used is the analysis of web content of the communities website at IPB and development protoype using the MediaWiki software. The first results of this study are categories of knowledge created consisting of the main knowledge about the student association, student activity units, other communities, the terms of the campus and the surrounding of the campus. Second, in designing a prototype of Wiki Kampus make a data flow diagrams, system infrastructure, and installation. Furthermore, installation of MediaWiki including by several stages: (1) downloading and extracting the file master MediaWiki on a web server, (2) set-up the master files MediaWiki, (3) determine the format page categorizing and customize the user interface, and (4) set up a user account for students. Third, Wiki Kampus tested by some students of Master of Information Technology for Libraries (MTP) at IPB and the results is function well.</p><p>Kajian ini bertujuan untuk: (1) membuat kategori pengetahuan komunitas di perpusatakaan PT, (2) merancang prototipe ensiklopedia daring pengetahuan komunitas di perpustakaan PT, dan (3) melakukan ujicoba prototipe ensiklopedia daring pengetahuan komunitas. Metode yang digunakan yaitu analisis konten web komunitas di IPB dan pengembangan prototipe Wiki Kampus menggunakan perangkat lunak MediaWiki. Hasil dari kajian ini yaitu kategori pengetahuan yang dibuat terdiri dari pengetahuan utama yakni seputar himpunan mahasiswa, unit kegiatan mahasiswa, komunitas lain, istilah-istilah kampus dan lingkungan sekitar kampus. Hasil perancangan prototipe Wiki Kampus terdiri dari pembuatan <em>data flow diagram</em>, perencanaan infrastruktur sistem dan penginstalasian perangkat lunak MediaWiki. Penginstalasian MediaWiki melalui beberapa tahapan di antaranya: (1) mengunduh dan mengekstraksi file master MediaWiki pada server web, (2) melakukan <em>set-up</em> file master MediaWiki, (3) menentukan format <em>page categorizing</em> dan mengkustomisasi tampilan pengguna, serta (4) menyiapkan <em>user account</em> untuk mahasiswa. Ketiga, ujicoba Wiki Kampus dilakukan oleh beberapa mahasiswa program Magister Teknologi Informasi untuk Perpustakaan (MTP) IPB berjalan lancar dan berfungsi dengan baik.</p>

scholarly journals GEOMETRIC CALIBRATION AND VALIDATION OF ULTRACAM AERIAL SENSORS

2016 ◽  
Vol XL-3/W4 ◽  
pp. 51-53
Author(s):  
Michael Gruber ◽  
Bernhard Schachinger ◽  
Marc Muick ◽  
Christian Neuner ◽  
Helfried Tschemmernegg
Keyword(s):  
Aerial Images ◽  
Camera System ◽  
Geometric Calibration ◽  
Calibration And Validation ◽  
Camera Systems ◽  
Laboratory Calibration ◽  
Software Product ◽  
Validation Procedure ◽  
Set Up

We present details of the calibration and validation procedure of UltraCam Aerial Camera systems. Results from the laboratory calibration and from validation flights are presented for both, the large format nadir cameras and the oblique cameras as well. Thus in this contribution we show results from the UltraCam Eagle and the UltraCam Falcon, both nadir mapping cameras, and the UltraCam Osprey, our oblique camera system. This sensor offers a mapping grade nadir component together with the four oblique camera heads. The geometric processing after the flight mission is being covered by the UltraMap software product. Thus we present details about the workflow as well. The first part consists of the initial post-processing which combines image information as well as camera parameters derived from the laboratory calibration. The second part, the traditional automated aerial triangulation (AAT) is the step from single images to blocks and enables an additional optimization process. We also present some special features of our software, which are designed to better support the operator to analyze large blocks of aerial images and to judge the quality of the photogrammetric set-up.

Characterization of a Newly Designed Test Bench for Investigations of Flame-Wall-Interaction

2021 ◽  
Author(s):  
Rahand Dalshad ◽  
Tobias Sander ◽  
Michael Pfitzner
Keyword(s):  
Test Bench ◽  
Turbine Blades ◽  
Thermal Design ◽  
Optical Methods ◽  
Detailed Knowledge ◽  
Combustion Chambers ◽  
First Results ◽  
Wall Interaction ◽  
Set Up ◽  
Near Wall

Abstract For the thermal design of combustion chambers and turbine blades in jet engines, a detailed knowledge of the combustion and of the heat loads to the walls is necessary. In general, high operating temperatures and reduced combustor size are striven for in order to increase engine efficiency and reduce weight. Consequently, the components are exposed to temperatures above the melting point of the materials and there is a growing risk of incomplete combustion within the combustion chambers. To study these effects, we set up a new test bench for fundamental investigation of chemical near-wall reactions at atmospheric pressure. First results of gaseous, non-premixed near-wall CH4/air and H2/air flames are presented. Optical methods such as two-line laser-induced fluorescence thermometry and OH* chemiluminescence were applied. Further, the heat release to the wall was determined by means of inverse heat conduction calculation using the data of implemented thermocouples.

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