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  • 1
    Online Resource
    Online Resource
    The James Webb Space Telescope Mission
    IOP Publishing ; 2023
    In:  Publications of the Astronomical Society of the Pacific Vol. 135, No. 1048 ( 2023-06-01), p. 068001-
    Details
    In: Publications of the Astronomical Society of the Pacific, IOP Publishing, Vol. 135, No. 1048 ( 2023-06-01), p. 068001-
    Abstract: Twenty-six years ago a small committee report, building on earlier studies, expounded a compelling and poetic vision for the future of astronomy, calling for an infrared-optimized space telescope with an aperture of at least 4 m. With the support of their governments in the US, Europe, and Canada, 20,000 people realized that vision as the 6.5 m James Webb Space Telescope. A generation of astronomers will celebrate their accomplishments for the life of the mission, potentially as long as 20 yr, and beyond. This report and the scientific discoveries that follow are extended thank-you notes to the 20,000 team members. The telescope is working perfectly, with much better image quality than expected. In this and accompanying papers, we give a brief history, describe the observatory, outline its objectives and current observing program, and discuss the inventions and people who made it possible. We cite detailed reports on the design and the measured performance on orbit.
    Type of Medium: Online Resource
    ISSN: 0004-6280 , 1538-3873
    URL: Article
    DOI: 10.1088/1538-3873/acd1b5
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2003100-2
    detail.hit.zdb_id: 2207655-4
    SSG: 16,12
    Location Call Number Limitation Availability
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    Online Resource
  • 2
    Online Resource
    Online Resource
    The Science Performance of JWST as Characterized in Commissioning
    IOP Publishing ; 2023
    In:  Publications of the Astronomical Society of the Pacific Vol. 135, No. 1046 ( 2023-04-01), p. 048001-
    Details
    In: Publications of the Astronomical Society of the Pacific, IOP Publishing, Vol. 135, No. 1046 ( 2023-04-01), p. 048001-
    Abstract: This paper characterizes the actual science performance of the James Webb Space Telescope (JWST), as determined from the six month commissioning period. We summarize the performance of the spacecraft, telescope, science instruments, and ground system, with an emphasis on differences from pre-launch expectations. Commissioning has made clear that JWST is fully capable of achieving the discoveries for which it was built. Moreover, almost across the board, the science performance of JWST is better than expected; in most cases, JWST will go deeper faster than expected. The telescope and instrument suite have demonstrated the sensitivity, stability, image quality, and spectral range that are necessary to transform our understanding of the cosmos through observations spanning from near-earth asteroids to the most distant galaxies.
    Type of Medium: Online Resource
    ISSN: 0004-6280 , 1538-3873
    URL: Article
    DOI: 10.1088/1538-3873/acb293
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2003100-2
    detail.hit.zdb_id: 2207655-4
    SSG: 16,12
    Location Call Number Limitation Availability
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  • 3
    Online Resource
    Online Resource
    Wetting and dewetting of extracellular matrix and glycocalix models
    IOP Publishing ; 2005
    In:  Journal of Physics: Condensed Matter Vol. 17, No. 9 ( 2005-03-09), p. S649-S663
    Details
    In: Journal of Physics: Condensed Matter, IOP Publishing, Vol. 17, No. 9 ( 2005-03-09), p. S649-S663
    Type of Medium: Online Resource
    ISSN: 0953-8984 , 1361-648X
    URL: Article
    DOI: 10.1088/0953-8984/17/9/022
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2005
    detail.hit.zdb_id: 1472968-4
    detail.hit.zdb_id: 228975-1
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  • 4
    Online Resource
    Online Resource
    Uniqueness of relaxation times determined by dielectric spectroscopy
    IOP Publishing ; 2023
    In:  Journal of Physics: Condensed Matter Vol. 35, No. 18 ( 2023-05-10), p. 185101-
    Details
    In: Journal of Physics: Condensed Matter, IOP Publishing, Vol. 35, No. 18 ( 2023-05-10), p. 185101-
    Abstract: Dielectric spectroscopy is extremely powerful to study molecular dynamics, because of the very broad frequency range. Often multiple processes superimpose resulting in spectra that expand over several orders of magnitude, with some of the contributions partially hidden. For illustration, we selected two examples, (i) normal mode of high molar mass polymers partially hidden by conductivity and polarization and (ii) contour length fluctuations partially hidden by reptation using the well-studied polyisoprene melts as example. The intuitive approach to describe experimental spectra and to extract relaxation times is the addition of two or more model functions. Here, we use the empirical Havriliak-Negami function to illustrate the ambiguity of the extracted relaxation time, despite an excellent agreement of the fit with experimental data. We show that there are an infinite number of solutions for which a perfect description of experimental data can be achieved. However, a simple mathematical relationship indicates uniqueness of the pairs of the relaxation strength and relaxation time. Sacrificing the absolute value of the relaxation time enables to find the temperature dependence of the parameters with a high accuracy. For the specific cases studied here, the time temperature superposition (TTS) is very useful to confirm the principle. However, the derivation is not based on a specific temperature dependence, hence, independent from the TTS. We compare new and traditional approaches and find the same trend for the temperature dependence. The important advantage of the new technology is the knowledge of the accuracy of the relaxation times. Relaxation times determined from data for which the peak is clearly visible are the same within the experimental accuracy for traditional and new technology. However, for data where a dominant process hides the peak, substantial deviations can be observed. We conclude that the new approach is particularly helpful for cases in which relaxation times need to be determined without having access to the associated peak position.
    Type of Medium: Online Resource
    ISSN: 0953-8984 , 1361-648X
    URL: Article
    DOI: 10.1088/1361-648X/acbcb8
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 1472968-4
    detail.hit.zdb_id: 228975-1
    Location Call Number Limitation Availability
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  • 5
    Online Resource
    Online Resource
    End block dynamics in unentangled polymers by dielectric spectroscopy
    IOP Publishing ; 2023
    In:  Journal of Physics: Condensed Matter Vol. 35, No. 37 ( 2023-09-18), p. 375101-
    Details
    In: Journal of Physics: Condensed Matter, IOP Publishing, Vol. 35, No. 37 ( 2023-09-18), p. 375101-
    Abstract: Dielectric spectroscopy measures the dynamics of polymer melts over a broad frequency range. Developing a theory for the spectral shape can extend the analysis of dielectric spectra beyond determining relaxation times from the peak maxima and adds physical meaning to shape parameters determined with empirical fit functions. Toward this goal, we use the experimental results on unentangled poly(isoprene), and unentangled poly(butylene oxide), polymer melts, to test whether the concept of end blocks could be one reason for the Rouse model deviating from experimental data. These end blocks have been suggested by simulations and neutron spin echo spectroscopy and are a consequence of the monomeric friction coefficient depending on the position of the bead in the chain. The concept of an end block is an approximation which partitions the chain in a middle and two end blocks to avoid overparameterization by a continuous position dependent change of the friction parameter. Analysis of dielectric spectra shows that the deviations of the calculated from the experimental normal mode cannot be related to the end block relaxation. However, the results do not contradict an end block hiding below the segmental relaxation peak. It seems that the results are compatible with an end block being the specific part of the sub-Rouse chain interpretation close to the chain ends.
    Type of Medium: Online Resource
    ISSN: 0953-8984 , 1361-648X
    URL: Article
    DOI: 10.1088/1361-648X/acdbf7
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 1472968-4
    detail.hit.zdb_id: 228975-1
    Location Call Number Limitation Availability
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