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  • Articles  (341)
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  • 1
    facet.materialart.
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    Session 10 Photosynthesis (1994)
    Springer
    Details
    Publication Date: 1994-01-01
    Print ISSN: 0006-3134
    Electronic ISSN: 1573-8264
    Topics: Biology
    Published by Springer
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Ab Initio Study of Electronic Structure and Jahn-Teller Effect of Tetrachloromethane Cation (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 12135-12140 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100032a014
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Electronic structure for the configurations ndk+1(n+1)s0(n+1)p1, ndk(n+1)s1(n+1)p1, and ndk−1(n+1)s2(n+1)p1 (k=1 to 10) in the first and second row of transition metals (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 9626-9630 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Systematic numerical Hartree–Fock results for the lower states of the configurations ndk+1(n+1)s0(n+1)p1, ndk(n+1)s1(n+1)p1, and ndk−1(n+1)s2(n+1)p1 corresponding to the neutral atoms of the first and second row of transition metals are reported. Average energies of each configuration and LS energies of the corresponding lowest states are presented and discussed. The excitation energies and the relative orbital sizes for these states are also examined. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468780
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  • 4
    Electronic Resource
    Electronic Resource
    Multiprocessor architecture to handle TJ-II VXI-based digitization channels : Proceedings of the 12th topical conference on high temperature plasma diagnostics (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 513-516 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The data acquisition System (DAS) of the TJ-II stellerator provides up to 300 digitization channels integrated in register-based VXI modules designed in CIEMAT Laboratories. The modules are embedded into six 13-slot VXI chassis connected to the TJ-II DAS central computer by means of a dual LAN topology. During normal operation, remote control of the VXI systems and channel setup are accomplished through an Ethernet LAN, while two FDDI rings are dedicated to postdischarge fast data transfer. The former network link is performed by the bus controller whereas the latter one is provided through a FDDI node controller installed in the mainframe, thus creating a multiprocessor architecture. Dedicated software, running on the VxWorks operating system, has been developed to provide handling of the VXI systems including the following facilities: mainframe information readout, channel setup, real time digitization handling, and data transfer. This software, implemented in C++, is distributed over the two CPUs. Interprocessor communication for synchronization purposes is based on a backplane shared memory pool. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149432
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  • 5
    Electronic Resource
    Electronic Resource
    Applying object oriented concepts to on-line data acquisition : Proceedings of the 12th topical conference on high temperature plasma diagnostics (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 517-520 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Concepts of object oriented programming have been applied to the on-line part of the data acquisition system of the TJ-II flexible heliac. The programs were written in C++ for a VxWorks operating system which uses general purpose interface bus (GPIB) connections to control computer automated measurement and control (CAMAC) crates with various types of digitizer modules. Since the digitizers have similar functionality, the application of object oriented methods is particularly efficient. Unfortunately, the control code of the CAMAC had to be built up in layers since the CAMAC/GPIB system is not well suited for good object oriented organization. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149341
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  • 6
    Electronic Resource
    Electronic Resource
    Encoding technique for high data compaction in data bases of fusion devices (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 4154-4160 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: At present, data requirements of hundreds of Mbytes/discharge are typical in devices such as JET, TFTR, DIII-D, etc., and these requirements continue to increase. With these rates, the amount of storage required to maintain discharge information is enormous. Compaction techniques are now essential to reduce storage. However, general compression techniques may distort signals, but this is undesirable for fusion diagnostics. We have developed a general technique for data compression which is described here. The technique, which is based on delta compression, does not require an examination of the data as in delayed methods. Delta values are compacted according to general encoding forms which satisfy a prefix code property and which are defined prior to data capture. Several prefix codes, which are bit oriented and which have variable code lengths, have been developed. These encoding methods are independent of the signal analog characteristics and enable one to store undistorted signals. The technique has been applied to databases of the TJ-I tokamak and the TJ-IU torsatron. Compaction rates of over 80% with negligible computational effort were achieved. Computer programs were written in ANSI C, thus ensuring portability and easy maintenance. We also present an interpretation, based on information theory, of the high compression rates achieved without signal distortion. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147544
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  • 7
    Electronic Resource
    Electronic Resource
    Accessing TJ-II data with remote procedure call : Papers from the thirteenth topical conference on high temperature plasma diagnostics (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 525-529 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new software, based on the de facto standard Open Network Computing Remote Procedure Call (ONC RPC) has been developed for TJ-II database access. This software solution replaces a previous development based on Berkeley sockets in which the client implementation had the drawback that was platform dependent. From the user point of view, the access to the TJ-II database can be done from codes running in the central server or from any other computer in the network in exactly the same way. From the development point of view, the ONC RPC tools allow to generate source code for the clients in an easy and flexible manner, thus reducing the work needed to maintain/upgrade the library for different platforms. The access to the database is managed by a concurrent server program, running on the central server, which implements each access routine as a service on the network. This allows controlling the accesses to the database. A client library has been developed to provide connection with the data server. This library implements a client routine per service, that interchanges parameters between client and server programs using External Data Representation. The client library has been installed in different UNIX and UNIX-like platforms, including ALPHA AXP/Digital UNIX, Sparc/SOLARIUS, INTEL/LINUX and CRAY/UNICOS and in Windows (NT/95/98) platforms. The support for Windows platforms allows autonomous PC-based acquisition systems to integrate experimental data into the data base. A basic in-house developed identification system is used to control client connections. An access policy has been defined in order to assign different permissions to different clients. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1316757
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  • 8
    Electronic Resource
    Electronic Resource
    A spectroscopic method to directly measure nonthermal velocity fluctuations (abstract) : Proceedings of the tenth topical conference on high temperature plasma diagnostics (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 447-447 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A spectroscopic method to directly measure the nonthermal velocity fluctuations is being studied in the TJ-I tokamak. The method is based on converting velocity in intensity fluctuations by subtracting the signals received at two symmetric positions of a spectral emission line. This is accomplished by means of a multichannel detector in which the channels respond to the line intensity at different wavelengths and positions within a single spectral line. A multichannel plate photomultiplier, with an anode split in 8×8 parts, is optically coupled by means of an anamorphic optical system, to the focal plane of a 1 m spectrometer where the image of a spectral line is formed. Some individual anodes are grouped to configurate four acquisition channels which are fled into four current amplifiers. The 100 kHz bandwidth signals are stored in a digital oscilloscope connected to a VAX computer, where the signals are processed. A simple simulation allows us to relate the differential signal between symmetrical channels to velocity in cases where the radial extension of the emitting ion is comparable to the radial correlation length of the turbulence causing the velocity fluctuations. The influence of the detection statistics on the measurement is analyzed. Preliminary results obtained in the TJ-I tokamak, using this system, will be presented. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146376
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  • 9
    Electronic Resource
    Electronic Resource
    Measurement of density and temperature fluctuations using a fast-swept Langmuir probe : Proceedings of the 9th topical conference on high temperature plasma diagnostics (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4605-4607 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Density and temperature fluctuations have been measured in the proximity of the velocity shear location of the TJ-I tokamak using a fast-swept Langmuir probe technique. From the current voltage characteristic we have determined the electron temperature and the density in a time scale which is small compared with the relevant times of the turbulence. Evidence of substantial temperature fluctuations has been found near the shear location.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143682
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  • 10
    Electronic Resource
    Electronic Resource
    A fully programmable data acquisition system for the TJ-I and TJ-IU devices : Proceedings of the 9th topical conference on high temperature plasma diagnostics (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4806-4808 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new data acquisition system has been developed for the TJ-I tokamak and the TJ-IU torsatron. This system is based on the VME standard and it is controlled by an MC68020 microprocessor. This scheme is similar to the ones existing at CERN and used in high-energy physics experiments. [On-line Computing Group, Valet-Plus Operation Guide, Data handling, CERN DD Division OC Group]. The data acquisition system consists of 60 independent, fully programmable channels. Each channel has its own analog-to-digital converter (ADC) with a resolution of ten bits and a RAM memory of 128 kbytes (kB). A digital-to-analog converter is also included for providing an analog output in order to display the stored signal on oscilloscopes. The maximum sampling rate achievable with the ADC used is 500 Ksamples/s, which is equivalent to a sampling period of 2 μs. Each channel is programmed to have its own sampling period (in 400-ns steps), and to use the amount of storage required according to the sampling period and the pulse length, up to a maximum of 128 kB. The system controls not only the 7680 kB corresponding to the memory of the 60 channels, but a RAM buffer of 4 MB as well. The system is linked to a local ETHERNET network in order to send the recorded data to the disks of a VAX/VMS computer, where the data are available for analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143569
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