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Search Results (5)

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Keywords = shielings

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36 pages, 53355 KiB  
Article
Making the Invisible Visible: The Applicability and Potential of Non-Invasive Methods in Pastoral Mountain Landscapes—New Results from Aerial Surveys and Geophysical Prospection at Shielings Across Møre and Romsdal, Norway
by Kristoffer Dahle, Dag-Øyvind Engtrø Solem, Magnar Mojaren Gran and Arne Anderson Stamnes
Remote Sens. 2025, 17(7), 1281; https://doi.org/10.3390/rs17071281 - 3 Apr 2025
Viewed by 1602
Abstract
Shielings are seasonal settlements found in upland pastures across Scandinavia and the North Atlantic. New investigations in the county of Møre and Romsdal, Norway, demonstrate the existence of this transhumant system by the Viking Age and Early Middle Ages. Sub-terranean features in these [...] Read more.
Shielings are seasonal settlements found in upland pastures across Scandinavia and the North Atlantic. New investigations in the county of Møre and Romsdal, Norway, demonstrate the existence of this transhumant system by the Viking Age and Early Middle Ages. Sub-terranean features in these pastoral mountain landscapes have been identified by remote sensing technologies, but non-invasive methods still face challenges in terms of practical applicability and in confirming the presence of archaeological sites. Generally, aerial surveys, such as LiDAR and image-based modelling, excel in documenting visual landscapes and may enhance detection of low-visibility features. Thermography may also detect shallow subsurface features but is limited by solar conditions and vegetation. Magnetic methods face challenges due to the heterogeneous moraine geology. Ground-penetrating radar has yielded better results but is highly impractical and inefficient in these remote and rough landscapes. Systematic soil coring or test-pitting remain the most reliable options for detecting these faint sites, yet non-invasive methods may offer a better understanding of the archaeological contexts—between the initial survey and the final excavation. Altogether, the study highlights the dependency on landscape, soil, and vegetation, emphasising the need to consider each method’s possibilities and limitations based on site environments and conditions. Full article
(This article belongs to the Special Issue Application of Remote Sensing in Cultural Heritage Research II)
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19 pages, 2524 KiB  
Article
Curing, Properties and EMI Absorption Shielding of Rubber Composites Based on Ferrites and Carbon Fibres
by Ján Kruželák, Andrea Kvasničáková, Michaela Džuganová, Lenka Hašková, Rastislav Dosoudil and Ivan Hudec
Polymers 2023, 15(4), 857; https://doi.org/10.3390/polym15040857 - 9 Feb 2023
Cited by 11 | Viewed by 2480
Abstract
In this work, magnetic soft ferrites, namely manganese–zinc ferrite, nickel–zinc ferrite and combinations of both fillers, were incorporated into acrylonitrile-butadiene rubber to fabricate composite materials. The total content of ferrites was kept constant—300 phr. The second series of composites was fabricated with a [...] Read more.
In this work, magnetic soft ferrites, namely manganese–zinc ferrite, nickel–zinc ferrite and combinations of both fillers, were incorporated into acrylonitrile-butadiene rubber to fabricate composite materials. The total content of ferrites was kept constant—300 phr. The second series of composites was fabricated with a similar composition. Moreover, carbon fibres were incorporated into rubber compounds in constant amount—25 phr. The work was focused on investigation of the fillers on absorption shieling performance of the composites, which was investigated within the frequency range 1–6 GHz. Then, the physical–mechanical properties of the composites were evaluated. The achieved results demonstrated that the absorption shielding efficiency of both composite types increased with increasing proportion of nickel–zinc ferrite, which suggests that nickel–zinc ferrite demonstrated better absorption shielding potential. Higher electrical conductivity and higher permittivity of composites filled with carbon fibres and ferrites resulted in their lower absorption shielding performance. Simultaneously, they absorbed electromagnetic radiation at lower frequencies. On the other hand, carbon fibres reinforced the rubber matrix, and subsequent improvement in physical–mechanical properties was recorded. Full article
(This article belongs to the Special Issue Reverse Engineering of Rubber Products in Science and Practice)
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12 pages, 3435 KiB  
Article
“Cow Healers Use It for Both Horses and Cattle”: The Rise and Fall of the Ethnoveterinary Use of Peucedanum ostruthium (L.) Koch (fam. Apiaceae) in Sweden
by Erik de Vahl, Giulia Mattalia and Ingvar Svanberg
Plants 2023, 12(1), 116; https://doi.org/10.3390/plants12010116 - 26 Dec 2022
Cited by 2 | Viewed by 3199
Abstract
Masterwort, Peucedanum ostruthium (L.) Koch, is an Apiaceae species originally native to the mountain areas of central and southern Europe. Written sources show that it was used in northern Europe. This study explores the cultivation history of masterwort and its past use in [...] Read more.
Masterwort, Peucedanum ostruthium (L.) Koch, is an Apiaceae species originally native to the mountain areas of central and southern Europe. Written sources show that it was used in northern Europe. This study explores the cultivation history of masterwort and its past use in Sweden. Although only few details are known about the history of this taxon, it represents a cultural relict plant of an intentionally introduced species known in Sweden as early as the Middle Ages. In Sweden, the masterwort was mainly used as an ethnoveterinary herbal remedy from the seventeenth to nineteenth centuries. However, medicinal manuals, pharmacopoeias and some ethnographical records indicate that it was once also used in remedies for humans. Today, this species remains as a living biocultural heritage in rural areas, especially on the surviving shielings, which were once used as mountain pastures in Dalecarlia, and at former crofts that were inhabited by cattle owners in the forest areas of southern Sweden. Full article
(This article belongs to the Special Issue Historical Ethnobotany: Interpreting the Old Records)
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11 pages, 4209 KiB  
Article
Use of a Plasma-Sprayed Titanium-Hydroxyapatite Femoral Stem in Hip Arthroplasty in Patients Older than 70 Years. Is Cementless Fixation a Reliable Option in the Elderly?
by Nicola Piolanti, Elisabetta Neri, Enrico Bonicoli, Paolo Domenico Parchi, Stefano Marchetti, Mario Manca, Luca Bonini, Lorenzo Banci and Michelangelo Scaglione
J. Clin. Med. 2021, 10(20), 4735; https://doi.org/10.3390/jcm10204735 - 15 Oct 2021
Cited by 11 | Viewed by 3296
Abstract
Background: Although cementless implants are increasing in popularity, the use of cementless femoral stems for total hip arthroplasty (THA) and hip hemiarthroplasty (HH) in elderly patients remains controversial. The aim of this study was to report the outcomes of a cementless stem used [...] Read more.
Background: Although cementless implants are increasing in popularity, the use of cementless femoral stems for total hip arthroplasty (THA) and hip hemiarthroplasty (HH) in elderly patients remains controversial. The aim of this study was to report the outcomes of a cementless stem used in a large multicentric cohort of elderly patients receiving elective THA and HH for displaced femoral neck fracture. Methods: A total of 293 patients (301 hips) aged 70 years or older (mean age, 78 years; range, 70–93) who received the same cementless plasma-sprayed porous titanium–hydroxyapatite stem were retrospectively evaluated after primary THA and HH to investigate stem survival, complications, and clinical and radiographic results. Results: Cumulative stem survival was 98.5% (95% CI, 96.4–99.4%; 91 hips at risks) with revision due to any reason as the end-point at 10-year follow-up (mean 8.6 years, range 4–12). No stem was revised due to aseptic loosening. The mean Forgotten Joint Score was 98.7. Radiographically, the implants showed complete osseointegration, with slight stress-shieling signs in less than 10% of the hips. Conclusion: The use of cementless stems was proven to be a reliable and versatile option even in elderly patients for elective THA and HH for femoral neck fracture. Full article
(This article belongs to the Section Orthopedics)
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10 pages, 3270 KiB  
Article
Influence of Orbital Parameters on SEU Rate of Low-Energy Proton in Nano-SRAM Device
by Bing Ye, Li-Hua Mo, Tao Liu, You-Mei Sun and Jie Liu
Symmetry 2020, 12(12), 2030; https://doi.org/10.3390/sym12122030 - 8 Dec 2020
Viewed by 4085
Abstract
The on-orbit single-event upset (SEU) rate of nanodevices is closely related to the orbital parameters. In this paper, the on-orbit SEU rate (OOSR) induced by a heavy ion (HI), high-energy proton (HEP) and low-energy proton (LEP) for a 65 nm SRAM device is [...] Read more.
The on-orbit single-event upset (SEU) rate of nanodevices is closely related to the orbital parameters. In this paper, the on-orbit SEU rate (OOSR) induced by a heavy ion (HI), high-energy proton (HEP) and low-energy proton (LEP) for a 65 nm SRAM device is calculated by using the software SPACE RADIATION under different orbits based on the experimental data. The results indicate that the OOSR induced by the HI, HEP and LEP varies with the orbital parameters. In particular, the orbital height, inclination and shieling thickness are the key parameters that affect the contribution of the LEP to the total OOSR. Our results provide guidance for the selection of nanodevices on different orbits. Full article
(This article belongs to the Special Issue Astrodynamics and Control)
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