[en] The link between open and closed sets in fuzzy topological space is well established by utilizing the classical complement $\mathcal{C}(\mathrm{\lambda <!--\; ??\; -->})=1-<!--\; ???\; -->\mathrm{\lambda <!--\; ??\; -->}$. The concept of arbitrary complement function in fuzzy literature generalizes the concepts of fuzzy topological spaces. A new class of semi sets is proposed by arbitrary fuzzy complement and their properties are discussed. (paper)

[en] Magnetisation reversal by precession has been observed for a micron-sized (4 μmx8 μm) spin-valve element in response to 250 ps field pulses. Due to the dispersion of the magnetisation orientation at remanence, the magnetisation of only a small fraction of the sample is aligned perpendicular to the excitation field and can undergo precessional reversal. Although this leads to an overall reduced magneto-resistance ratio, two well-defined signal levels can be established

[en] We present the results of a survey of young intermediate-mass stars (age < 5 Myr, 1.5 M_sun < M_*≤ 15 M_sun) in the W5 massive star-forming region. We use combined optical, near-infrared, and Spitzer Space Telescope photometry and optical spectroscopy to define a sample of stars of spectral types A and B and examine their infrared excess properties. We find objects with infrared excesses characteristic of optically thick disks, i.e., Herbig AeBe stars. These stars are rare: <1.5% of the entire spectroscopic sample of A and B stars, and absent among stars more massive than 2.4 M_sun. 7.5% of the A and B stars possess infrared excesses in a variety of morphologies that suggest their disks are in some transitional phase between an initial, optically thick accretion state and later evolutionary states. We identify four morphological classes based on the wavelength dependence of the observed excess emission above theoretical photospheric levels: (1) the optically thick disks; (2) disks with an optically thin excess over the wavelength range 2-24 μm, similar to that shown by Classical Be stars; (3) disks that are optically thin in their inner regions based on their infrared excess at 2-8 μm and optically thick in their outer regions based on the magnitude of the observed excess emission at 24 μm; (4) disks that exhibit empty inner regions (no excess emission at λ ≤ 8 μm) and some measurable excess emission at 24 μm. A sub-class of disks exhibit no significant excess emission at λ≤ 5.8 μm, have excess emission only in the Spitzer 8 μm band and no detection at 24 μm. We discuss these spectral energy distribution types, and suggest physical models for disks exhibiting these emission patterns and additional observations to test these theories.

[en] In this study, a Probability of Detection (PoD) experimental study was carried out in the framework of a Belgian-Quebec/Canada collaborative research project called ThermoPoD. Experiments were implemented on a Carbon Fiber Reinforced Plastic (CFRP) specimen with embedded material simulating delamination. For active infrared thermography, different heating sources (optical or ultrasound), heating forms (pulsed or lock-in), and data processing methods, such as Fourier Transform, Thermal Signal Reconstruction, Wavelet Transform, Differential Absolute Contrast, and Principal Component Thermography are of interest. In the present study, the effects of various data processing methods on PoD curves are compared

No abstract available

[en] The fabrication of high Tc superconducting thin films devices, for instance in the field of high frequency microelectronics, has revealed the need for micronic sizes of the deposit. In this way, the use of ion etching is of great interest since it enables lower pattern sizes than wet or laser etching. However, it appeared that conventional Ar etching results in a degradation of the features of the films. We will briefly report on a systematic investigation of the reasons of this degradation and propose two easy solutions. (orig.)

[en] The measurement of the magnetic penetration depth is of great interest for High Tc thin films microwave applications because it is related to the losses. Moreover, it is a fundamental parameter which gives information on the superconducting gap and its dependence with the temperature. We will report here a high frequency absolute measurement of this penetration depth down to liquid Helium temperature in the case of YBaCuO. (orig.)

[en] The field of structural DNA nanotechnology has evolved remarkably—from the creation of artificial immobile junctions to the recent DNA–protein hybrid nanoscale shapes—in a span of about 35 years. It is now possible to create complex DNA-based nanoscale shapes and large hierarchical assemblies with greater stability and predictability, thanks to the development of computational tools and advances in experimental techniques. Although it started with the original goal of DNA-assisted structure determination of difficult-to-crystallize molecules, DNA nanotechnology has found its applications in a myriad of fields. In this review, we cover some of the basic and emerging assembly principles: hybridization, base stacking/shape complementarity, and protein-mediated formation of nanoscale structures. We also review various applications of DNA nanostructures, with special emphasis on some of the biophysical applications that have been reported in recent years. In the outlook, we discuss further improvements in the assembly of such structures, and explore possible future applications involving super-resolved fluorescence, single-particle cryo-electron (cryo-EM) and x-ray free electron laser (XFEL) nanoscopic imaging techniques, and in creating new synergistic designer materials. (topical review)

[en] The Wide-field Infrared Survey Explorer has uncovered a population of young stellar objects (YSOs) in the Western Circinus molecular cloud. Images show the YSOs to be clustered into two main groups that are coincident with dark filamentary structure in the nebulosity. Analysis of photometry shows numerous Class I and II objects. The locations of several of these objects are found to correspond to known dense cores and CO outflows. Class I objects tend to be concentrated in dense aggregates, and Class II objects more evenly distributed throughout the region.

[en] Thermography is a nondestructive testing (NDT) technique based on the principle that two dissimilar materials, i.e., possessing different thermo-physical properties, would produce two distinctive thermal signatures that can be revealed by an infrared sensor, such as a thermal camera. The fields of NDT applications are expanding from classical building or electronic components monitoring to more recent ones such as inspection of artworks or composite materials. Furthermore, thermography can be conveniently used as a didactic tool for physics education in universities given that it provides the possibility of visualizing fundamental principles, such as thermal physics and mechanics among others. (paper)