Temat: deep-penetration - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Analytical Investigation on a New Approach for Achieving Deep Penetration in a Lossy Medium: The Lossy Prism
Autorzy:: Frezza, F.
Simeoni, P.
Tedeschi, N.
Powiązania:: https://bibliotekanauki.pl/articles/308620.pdf
Data publikacji:: 2017
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: deep-penetration
Ground Penetrating Radar
leakywave antennas
Opis:: Recent studies highlighted deep-penetration prop-erties of inhomogeneous waves at the interface between a loss-less and a lossy medium. Such waves can be generated bymeans of radiating structures known as Leaky-Wave Anten-nas (LWAs). Here, a different approach is proposed basedon the use of a lossy prism capable to generate an inhomo-geneous wave when illuminated by a homogeneous wave. Thelossy prism is conceived and designed thinking of Ground-Penetrating Radar (GPR). The results achieved by the lossyprism will be compared with those obtained by means of a pre-viously designed LWA that was created with the identical ob-jective. The approach of this paper is purely theoretical, andit aims at providing basic ideas and preliminary results usefulfor an innovative LWA design.
Źródło:: Journal of Telecommunications and Information Technology; 2017, 3; 17-24
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Numerical Evaluation of Electromagnetic-wave Penetration at Normal Incidence through an Inhomogeneous-wave Approach
Autorzy:: Calcaterra, A.
Frezza, F.
Simeoni, P.
Tedeschi, N.
Powiązania:: https://bibliotekanauki.pl/articles/307928.pdf
Data publikacji:: 2018
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: deep-penetration
electromagnetic simulation
leakywave antennas
lossy prism
Opis:: This paper presents numerical scenarios concerning penetration in a lossy medium that can be obtained by radiating inhomogeneous electromagnetic waves. Former papers approached this problem, both analytically and numerically, ﬁnding requirements and limits of the so-called “deeppenetration” condition, which consists of a wave transmitted in a lossy medium having an attenuation vector whose direction forms the angle of ninety degrees with the normal to the separation surface. The deep-penetration condition always requires an oblique incidence, therefore is not practical in many applications. For this reason, we are interested here in ﬁnding whether an inhomogeneous wave guarantees larger penetration than the one obtainable with homogeneous waves, even when the incident wave is normal to the separation surface between two media, i.e. when the deep-penetration condition is not satisﬁed. We are also interested in verifying numerically whether the lossy-prism structure may achieve larger penetration than the one obtainable through traditional leakywave antennas, and we also wish to propose a lossy-prism design more realistic than the one previously presented in the literature.
Źródło:: Journal of Telecommunications and Information Technology; 2018, 2; 76-86
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The rational use of welds in steel structures
Autorzy:: Kubicki, Krzysztof
Powiązania:: https://bibliotekanauki.pl/articles/31342638.pdf
Data publikacji:: 2022
Wydawca:: Politechnika Częstochowska
Tematy:: spoina pachwinowa
spoina czołowa
proces spawania z głębokim wtopieniem
fillet weld
butt weld
deep-penetration welding process
Opis:: The incorrect design or execution of joints contributes to higher costs through material, time and/or energy losses. Choosing the right type of joint, type of weld or manufacturing technology may not only significantly reduce the expenditure, but also considerably increase the design resistance of the joint itself. The paper shows how to use butt and fillet welds more economically.
Źródło:: Budownictwo o Zoptymalizowanym Potencjale Energetycznym; 2022, 11; 85-92
2299-8535
2544-963X
Pojawia się w:: Budownictwo o Zoptymalizowanym Potencjale Energetycznym
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Effects of tillage alteration on soil water content, maize crop water potential and grain yield under subtropical humid climate conditions
Autorzy:: Chen, J.
He, Y.
Li, P.
Powiązania:: https://bibliotekanauki.pl/articles/2082993.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: soil penetration resistance
occasional deep tillage
no-till
seasonal drought
Opis:: Seasonal drought stress is common in farmland even under humid climate conditions. Low soil water content and high penetration resistance in clayey soil are both factors that limit crop growth, which is significantly affected by tillage. In a twoyear (2014-2015) field experiment conducted in Hubei, China, the effects of conventional tillage, along with occasional deep tillage and no-till, on the soil water content and penetration resistance values of red soil and on the crop water potentials of the maize crop (Zea mays L.) were tested. Compared to conventional tillage, deep tillage reduced the difference in the soil water characteristic curve between 0-40 cm soil layers, resulting in a more loose and homogeneous topsoil. The deep tillage significantly (p<0.05) decreased soil penetration resistance, increased soil-available water content and soil water content during the dry period, promoted an increase in maize root density by 11.4~31.6%, and increased the water potential of the maize root and leaf during most growth stages. In contrast, the effect of no-till was opposite to that of deep tillage, reducing maize grain yield by 25.3~26.3%. The results confirmed that no-till is not appropriate for the clayey red soil but rather that tillage is needed. This suggests that occasional deep tillage is helpful in mitigating seasonal crop drought stress under the conditions of a humid climate.
Źródło:: International Agrophysics; 2021, 35, 1; 1-9
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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