EurOCEAN 2000 - Vlaams Instituut voor de Zee

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$Wetenschap - \Nijverheid- Handel$

Orientation The electrical field approach can’t be used for orientation application, due to the large non uniformity of the generated field. This system uses an acoustic field generated from the ship. The feasibility of this application has been established, and the developments are now focused on the portability and real time aspects of the system. RESULTS The intercommunication main results are summarised in the following table. The simulations are realised with the finite element software FLUX-EXPERT ® , distributed by the company SIMULOG [8]. The experiments have been realised on Mediterranean sea and Leman lake. PARAMETER STUDY TYPE MAIN RESULT Frequency EXPERIMENTS 50% losses at 50 kHz Electrical water conductivity 596 SIMULATION - Water resistivity enables to generate strong electrical potential difference with low power consumption Shallow water SIMULATION - Strong ranging attenuation EMITTING ELECTRODE S Surface SIMULATION EXPERIMENTS - Enhancement of ranging/power ratio - Establishment of minimum surface Radius SIMULATION - Enhancement of ranging/power ratio Spacing SIMULATION Geometry (confidential) EXPERIMENTS EXPERIMENTS SIMULATION - Enhancement of ranging/power ratio - Enhancement of ranging/power ratio Axis orientation SIMULATION ≈ same order field in both radial & axial directions RECEIVING ELECTRODE S Choice of vertical position for practical reasons Axis orientation SIMULATION 30 dB saving with reception // to emission
The electrochemical effects on the electrical consumption (for a given ranging) have been studied. These losses can be minimised by finding a compromise between the electrode surface and the current density. Ranging versus power charts have been established for different types of emission electrodes, in order to quantify the respective influence of the electrodes diameter and surface. The electrical safety criteria [9-15] have been studied depending of the diver clothes (short, diving suit, gloves). The human body admissible current criteria for a contact longer than 10s is 10 mA (IEC 479 safe curve for a.c. current). For the case of 30m range communication between divers wearing only shorts (worst case, 1m 2 of electrical contact with water), the electrical safety is achieved with reasonable size electrodes. The electromagnetic effects are under study but their environmental impact is more difficult to establish. CONCLUSIONS The development realised on the scuba mouthpiece insuring communication through bone audio conduction is now finalised on a first serial product using plug to plug conduction (SCAPHONE ® , distributed by TFE company). To achieve the final step of diver born product, the water transmission will be more deeply studied (signal modulation, simulation of induced magnetic field and frequency skin effect on the power ranging). ACKNOWLEDGEMENTS The partners wish to acknowledge the European Commission and the Office Fédéral de l’Education et de la Science (OFES) for their financial support. REFERENCES [1] MacLeod NC (1977) : « Electric diver communication : Non acoustic system can operate in noisy environments », Sea technology [2] Williscroft RG, MacLeod NC : « A non-acoustic long distance underwater communication system » [3] E.C.Brainard, Gen Time Corp (1972) : «Underwater communication system » , US Patent N° 3 668 617, June [4] A.Prichodjko (1973): «Procédé de transmission radioélectrique des signaux et dispositions nécessaires à sa réalisation», Deutsch patent No.23 48 72 [5] N.C.MacLeod, Technology Development Corp (1980) : «Underwater communications system»., US Patent N° 4 207 568 June 597
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OFFICE FOR OFFICIAL PUBLICATIONS OF
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EurOCEAN 2000 The European Conferen
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TABLE OF CONTENTS (Volumes I - II)
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Integrated nitrogen model for europ
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II.1.2 Mehtods for monitoring, fore
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III.2.2 Oceanographic measurement a
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380
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382
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Jan van de Graaff Delft University
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dimensional near-field hydrodynamic
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ISVA, turbulence under spilling bre
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Most important results until now: W
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TITLE : PREDICTION OF COHESIVE SEDI
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394 PREDICTION OF COHESIVE SEDIMENT
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processes of CBS. This is particula
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liquefaction (e.g. induced by wave
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TITLE : COASTAL STUDY OF THREE-DIME
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COASTAL STUDY OF THREE-DIMENSIONAL
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morphological change. Their predict
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O’Connor B.A., and Nicholson J. (
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Professor F Seabra-Santos Universid
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The INDIA Project brings together m
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412 (CCMS-POL, USC) and bed sonar e
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Prof. D. Myrhaug (NTNU) Norwegian U
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project is focussed on relevant pra
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Modelling results for the flat bed
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engineering firms (coastal engineer
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422
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Luigi Alberotanza Inst. for the Stu
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All three sites are equipped with i
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2.3 Assessment of methods for the i
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TITLE : OPERATIONAL MODELLING FOR C
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‰ B. Model investigations on oper
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modelling strategies and sampling d
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TITLE: A USER-FRIENDLY TOOL FOR THE
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EUROWAVES OVERVIEW A quick illustra
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Figure 1 An example of the EUROWAVE
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Figure 4 Example output field for s
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444 EUROPEAN RADAR OCEAN SENSING He
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Figure1: WERA current field. Figure
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information in maps has proven to b
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Universidad Politecnica de Cataluny
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esources, such as in ship routing.
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Data Analysis The basic idea of adv
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implemented in system analyses and
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Dr. Claude Millot CNRS LOB/COM B.P.
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MEDITERRANEAN FORECASTING SYSTEM PI
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ADCP and line three mooring consist
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464 MeteoFrance ftp site Ocean forc
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TITLE: ASSESSMENT OF ANTIFOULING AG
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INTRODUCTION Antifouling paints are
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e.g. diuron was detected in Swedish
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esults suggest effects in the low n
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TITLE: SCOUR AROUND COASTAL STRUCTU
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Conference among others, and will b
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TOPIC 2.4. SEDIMENT TRANSPORT/SCOUR
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TITEL: VALIDATION OF LOW LEVEL ICE
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Ice compressive strength tests were
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subsequent inclined shear failure.
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486 Fig. 1 Fig. 2
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ir. M. Willems FC/FH - Flanders Hyd
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jetty and the armour layer. Out of
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Both the Zeebrugge and the Petten s
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alternative methods for the evaluat
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PORTUGAL Dr. César Andrade Centro
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Dr. Yolanda Foote Centre for Enviro
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cliff erosion and the life span of
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BIOLOGICAL PROCESSES ESPED recognis
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504
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506
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508
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510 AUTOMATIC IDENTIFICATION AND CH
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complexity of the data. Once traine
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INTEGRATING IDENTIFICATION AND CHAR
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TITLE: SEDIMENT IDENTIFICATION FOR
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518 SEDIMENT IDENTIFICATION FOR GEO
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The way to sense the marine environ
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6. Data processing and inversion (L
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TITLE: TRANSMISSION OF ELECTROMAGNE
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526 Attenuation dB/m 10 4 10 3 10 2
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Figure 2 Spectral response for wave
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TITLE: IMPROVED MICROSTRUCTURE MEAS
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IMPROVED MICROSTRUCTURE MEASUREMENT
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committee proposed the new establis
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of the profiler. Thus, the ACC98 se
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Figure 3b: Measurements of and diss
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TITLE: APPLICATIONS OF 3-DIMENSIONA
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2. OBJECTIVES The first objective o
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to demonstrate a capability for col
Page 180 and 181: 546 ADIAC: DIATOMS GO DIGITAL M. Ba
Page 182 and 183: SLIDE SCANNING FOR DIATOM LOCALIZAT
Page 184 and 185: performance of normal PCs and the a
Page 186 and 187: TITLE : SUBSEA TOOLS APPLICATION RE
Page 188 and 189: 554 SUBSEA TOOLS: A CRAFT PROJECT T
Page 190 and 191: RESULTS The deliverable is a multi-
Page 192 and 193: TITLE: DINOFLAGELLATE CATEGORISATIO
Page 194 and 195: 1998) has simplified the developmen
Page 196 and 197: Fig. 3: Example specimen images 562
Page 198 and 199: REFERENCES Culverhouse PF, Ellis RE
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Page 202 and 203: INTRODUCTION 568 LOTUS Long Range T
Page 204 and 205: DESIGN OF EXPERIMENTAL EQUIPMENT Th
Page 206 and 207: Figure 2: Complex base-band impulse
Page 208 and 209: ACKNOWLEDGEMENTS This work is funde
Page 210 and 211: 576 THE SEISCAN INITIATIVE: SEISMIC
Page 212 and 213: een fed through to the scanning cen
Page 214 and 215: Data scanned At the time of writing
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Page 218 and 219: 584 SUMMARY OF SWAN PROJECT OBJECTI
Page 220 and 221: Apart from suffering from ISI, a mu
Page 222 and 223: TITLE : LONG-RANGE SHALLOW-WATER RO
Page 224 and 225: OBJECTIVES Present communication sy
Page 226 and 227: RESULTS OF THE DATA ANALYSIS Analys
Page 228 and 229: TITLE : UNDERWATER DIVING INTERPERS
Page 232 and 233: [6] Virr LE (1987) « Role of elect
Page 234 and 235: TITLE : ELECTROACOUSTIC PROTOTYPE F
Page 236 and 237: specimen of bottlenose dolphin capt
Page 238 and 239: REFERENCES Cameron, G. 1999. Report
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Page 242 and 243: 608 HIGH RESOLUTION IN SITU HOLOGRA
Page 244 and 245: due to thermal expansion. The power
Page 246 and 247: 612 200 mm stages with optics and C
Page 248 and 249: III.1.4 Submarine geotechnics 615
Page 250 and 251: TITLE : GROUTED OFFSHORE PILES FOR
Page 252 and 253: Solution One solution to this probl
Page 254 and 255: technology. Harbour works, wharves,
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Page 258 and 259: VERY HIGH RESOLUTION MARINE 3D SEIS
Page 260 and 261: Monaco harbour (France) A very comp
Page 262 and 263: End-users highlighted the current,
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Page 266 and 267: package for Automatic Mobile Invest
Page 268 and 269: The operation of ARAMIS The typical
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Page 272 and 273: EURODOCKER - A UNIVERSAL DOCKING -
Page 274 and 275: RESULTS: EURODOCKER SYSTEM DESCRIPT
Page 276 and 277: THE PROTOTYPE The Construction of t
Page 278 and 279: TITLE : LIGHTWEIGHT COMPOSITE PRESS
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OBJECTIVES: The aim of the project
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TITLE : ADVANCED SYSTEM INTEGRATION
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651 Differential GPS - Reference St
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Figure 3.a The DELFIM ASC Figure 3.
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place vertically in the framework o
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[8] A. Pascoal, . P. Oliveira, C. S
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Eng. J.-M.Coudeville ORCA Instrumen
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THE GEOSTAR PROTOTYPE GEOSTAR proto
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CONCLUSIONS GEOSTAR 2 is a project
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goals of the project and results of
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III.2.2. Oceanographic measurement
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TITLE : GAS HYDRATE AUTOCLAVE CORIN
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initially most important parameters
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3.4 Finalization of delayed tasks i
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Dr. Margaret Yelland Southampton Oc
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RESULTS FROM THE FIRST PROJECT PERI
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Taylor,P. K. and M. J. Yelland, 199
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TRACE METAL MONOTORING IN SURFACE M
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THE FLUORESCENCE SIGNAL OBTAINED WH
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The reaction of 6-mercaptopurine, l
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TITLE : OCEAN TOMOGRAPHY OPERATIONA
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The OCTOPUS project has been runnin
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Fig. 2: Typical TOMOLAB input: Tomo
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The establishment of a data bank fo
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TITLE: SPECTROSCOPY USING OPTICAL F
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The overall objective of the SOFIE
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devoted to investigate the behaviou
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TITLE : DEVELOPMENT AND TEST OF AN
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in-situ (Nitrate, Nitrite, Ammonia,
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Apart from the measurements made in
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MANUFACTURE OF CALIBRATION SOLUTION
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einz-Detlef Kronfeldt, Heinar Schmi
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