[en] We demonstrated error-free operation of 4 simultaneous users in a fast frequency-hopping time-spreading optical code division multiple access system operating at 2.5 Gbit/s a Star architecture. Effective power penalty was ≤0.5dB. Novel optical code division multiple access receiver based on Terahertz Optical Asymmetric Demultiplexer was demonstrated to eliminate multiple access interference (Authors)

[en] In this work we have designed, modeled and simulated a 32-channel DWDM (Dense Wavelength Division Multiplexing) system using OptiSystem photonic simulator. The system is tested for external transmitter with NRZ (Non-Return Zero) encoder using Mech-Zehnder modulator, which accepts input from CW (Continuous Wave) laser array and low pass Bessel filter that supports PIN photodiode at receiver end. System performance for optical channels has been compared by varying channel length of EDFA (Erbium Doped Fiber Amplifier) and Raman amplifiers to identify its impact in the sense of eye diagram, QF (Quality Factor) and minimum BER (Bit Error Rate). Experimental setup was done by varying channel lengths of 60, 100, 120, 150 and 170Kms. It was found that EDFA has better performance in the sub-low ranges of 60Kms, whereas Raman offers better performance at wider channel lengths i.e. more than 100Kms. The proposed work can be extend for the avoidance of amplifier utilization at wider ranged. (author)

[en] The DRFC at the CEA/Cadarache has participated in the EFDA-JET Programme via the Task Agreement for Profile Control Studies in 1999 and via the EFDA-JET agreement in 2000. Several physicists have been seconded to Culham to work JET and many others have participated in the program 'at distance'. This task has necessitated careful consideration of working methods, often with 'ad-hoc' remote working solutions, but has led to a clear identification of the technical needs for Remote Participation (RP) for the new European Fusion Development Agreement (EFDA). We have contributed substantial input into the working groups evaluating the technical needs of RP

[en] The Trilateral Euregio Cluster (TEC) is a collaboration between three plasma-physics institutes: the Laboratory for Plasma Physics at the Koninklijke Militaire School (KMS) in Brussels, Belgium, the FOM Institute for Plasma Physics in Rijnhuizen, the Netherlands and the Institute for Plasma Physics at the Forschungszentrum Juelich (FZJ) in Germany. They jointly perform nuclear fusion experiments at the tokamak reactor 'Textor-94' in Juelich. Currently, scientists from FOM and KMS have to be physically present at the Textor-94 control room to participate in experiments. To show that remote participation is feasible, the Dynacore project built a software demonstrator that allows scientists to view measurement data, control measurement equipment and view the status of Textor-94. The demonstrator uses Java applets as clients, C++ servers, and CORBA for communication. The chosen architecture has the following advantages. It is portable, modular and reusable, eases collaboration in software development and optimizes for performance over the Internet. We solved the problems we had with applet security policies, the performance of our design and the integration of legacy systems. Our demonstrator shows that remote participation is feasible. The reactions from potential users are very positive. However, the demonstrator has to be improved for real usage in the future

[en] Generalized frequency division multiplexing is a multicarrier modulation technique which can be foreseen as a potential alternative for upcoming wireless networks. GFDM attractive features include reduced out-of-band radiation(OOB) and low peak-to-average ratio(PAPR), which are the crucial shortcomings of OFDM used in present day wireless communication networks. This paper gives detailed description of GFDM system model and further studies and validates through simulations, the performance of GFDM in terms of OOB, PAPR and Bit Error Rate (BER) and compares the results obtained with OFDM system.

[en] Full text: As a Major National Research Facility (MNRF), NANO unites five Australian microscopy and microanalysis centres to form the peak Australian facility for nanometric analysis of the structure and chemistry of materials. NANO is headquartered at the Australian Key Centre for Microscopy and Microanalysis at the University of Sydney and involves the Centres for Microscopy and Microanalysis at the Universities of Queensland and Western Australia, the Electron Microscope Unit at the University of New South Wales and the Microanalytical Research Centre at the University of Melbourne. Together these major centres maintain a wide range of complementary instrumentation for the characterisation of nanostructure. NANO links them into a co-ordinated national facility with unified charges and booking systems. The facility will provide open access to a wide range of present and future partners involving local and international linkages. For this reason, NANO is designed to allow the incorporation of other groups as additional nodes. All Australian researchers are eligible to apply for support to use NANO through the Travel and Access Program (NANO-TAP), which will support basic travel and accommodation costs as well as instrument time. Access to the national grid may involve on-site presence at a particular node or remote telemicroscopy. Both passive (observation) and active (operation) modes of telemicroscopy are available. This presentation will address the NANO-TAP application procedure, the use of remote telemicroscopy and the formation of additional nodes. Copyright (2003) Australian Microbeam Analysis Society

[en] The new collaborative exploitation of the JET Facilities requires suitable technical tools and infrastructure measures to enable the Remote Participation of scientists from all European Fusion labs. Such measures are being gradually introduced. They comprise of a toolkit for Remote Data Access, Remote Computer Access and for teleconferencing, and of infrastructure measures that address network connectivity, network security, shared documentation and technical support

[en] An endoscope-compatible, submicrometer-resolution scanning confocal microscopy imaging system is presented. This approach, spectrally encoded confocal microscopy (SECM), uses a quasi-monochromatic light source and a transmission diffraction grating to detect the reflectivity simultaneously at multiple points along a transverse line within the sample. Since this method does not require fast spatial scanning within the probe, the equipment can be miniaturized and incorporated into a catheter or endoscope. Confocal images of an electron microscope grid were acquired with SECM to demonstrate the feasibility of this technique. copyright 1998 Optical Society of America

[en] Plant maintenance and plant management activities are important for steady and safe operation of a nuclear plant. Therefore, the Structural Integrity Oriented Reliability Assessment System (SORE) has been developed as a prototype system to assist preservation management of the main components of the 'MONJU' plant. SORE calculates stress intensity and creep-fatigue damage of the cross-sections of the components using the plant data; coolant temperature history, coolant flow rate, and so forth. (author)

[en] The JT-60SA aims to contribute and supplement ITER toward DEMO reactor based on tokamak concept. One of the features of JT-60SA is its high power long pulse heating, causing the large annual neutron fluence. Because the expected dose rate at the vacuum vessel (VV) may exceed 1 mSv/hr after 10 years operation and three month cooling, the human access inside the VV is prohibited. Therefore a remote handling (RH) system is necessary for the maintenance and repair of in-vessel components. This paper described the RH system of JT-60SA, especially the expansion of the RH rail and exchange of the divertor modules. The RH rail is divided into nine and three-point mounting. The nine sections can cover 225 degrees in toroidal direction. A divertor module, which is 10 degrees wide in toroidal direction and weighs 500kg itself due to the limitations of port width and handling weight, can be exchanged by heavy weight manipulator (HWM). The HWM brings the divertor module to the front of the other RH port, which is used for supporting the rail and/or carrying in and out equipments. Then another RH device receives and brings out the module by a pallet installed from outside the VV. (author)