Disorder in Metamaterials

Gric, Tatjana; Hess, Ortwin

doi:10.1002/9781119407348.ch12

Cited by 3 publications

(5 citation statements)

References 110 publications

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“…Osnovna prednost korištenja numeričkih metoda pritom je u mogućnosti korištenja naprednih konstitutivnih modela kojima se može realnije predvidjeti odziv sredine u kojoj se tunel izvodi, kao i ponašanje elemenata podgradnog sklopa pri različitim uvjetima opterećenja. Na primjeru tunela Grič prema istoimenom projektu [1], u radu je provedena usporedba 2D i 3D numeričkih modela izrađenih na temelju informacija o lokaciji, podacima istražnih radova i zoniranja stijenske mase prema projektnoj dokumentaciji. Za modeliranje je odabran profil desne cijevi tunela s najnepovoljnijom pozicijom (najvećim nadslojem).…”

Section: Uvodunclassified

“…Na trasi su izbušene četiri istražne bušotine (dubine 30 -55 m). Dodatno je za potrebe glavnog projekta izbušena jedna istražna bušotina do dubine 70 m [1].…”

Section: Utvrđene Inženjerskogeološke Značajkeunclassified

“…Na osnovni geološkog i inženjerskogeološkog kartiranja, duž trase tunela Grič izdvojene su dvije litostratigrafske jedinice i šest tektonskih blokova koji su podijeljeni u četiri geotehničke jedinice unutar kojih su geološke i geotehničke karakteristike bitne za problem stabilizacije podzemnog iskopa približno istovjetne [8]. Geotehničku jedinicu 3, u kojoj se nalazi kritičan poprečni presjek modeliran u ovom radu, čini litostratigrafska jedinica vapnenci i postsedimentacijske vapnenačke breče donje krede (Slika 2) [1].…”

Section: Utvrđene Inženjerskogeološke Značajkeunclassified

“…Prema projektu Tunela Grič, analizirani profil nalazi se u geotehničkoj jedinici s vrijednošću RMR = 56 [1]. Bieniawski je 1989. objavio skup smjernica za iskop i trajno podgrađivanje tunela u stijeni za koje je utvrđena vrijednost RMR-a [3].…”

Section: Modelunclassified

“…Slijedeći korak je definiranje svojstava sidara koja će se ugraditi nakon iskopa, pri čemu će se koristiti samobušiva mlazno injektirana štapna sidra, nosivosti 190 kN te modula elastičnosti 210 GPa prema projektu Tunel Grič [1]. Definira se dužina sidara od 4 m na razmaku 2 m okomito na konturu poprečnog profila, na svakih 1 m duž osi tunela.…”

Section: Modelunclassified

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Prednosti korištenja 3D numeričkih modela u projektiranju tunela

Mance

Jovančević

Peranić

2022

Zb. rad. (Građev. fak. Rij., Online)

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Odabir između 2D i 3D numeričkog modeliranja ovisi prvenstveno o vrstiproblema koji se analizira, potrebama projekta, rokovima, dostupnim resursima teopravdanosti dodatnih ulaganja u složenije modele. U radu su prikazani rezultati2D i 3D numeričkih modela izvedbe dionice tunelske cijevi, kako bi se analiziraleosnovne razlike u dobivenim rezultatima i istaknule prednosti upotrebe 3D modela.Na temelju projektne dokumentacije, modeliran je poprečni presjek najnepovoljnijegprofila s najvećim nadslojem materijala. Analize su provedene u računalnimprogramima RS2 i RS3 tvrtke Rocscience. Rezultati su pokazali da je glavna prednost3D modela mogućnost praćenja povećanja radijalnih pomaka s napredovanjemiskopa te realnijeg uvida u efikasnost ugrađene podgrade.

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Section: Uvodunclassified

“…Na trasi su izbušene četiri istražne bušotine (dubine 30 -55 m). Dodatno je za potrebe glavnog projekta izbušena jedna istražna bušotina do dubine 70 m [1].…”

Section: Utvrđene Inženjerskogeološke Značajkeunclassified

Section: Modelunclassified

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Prednosti korištenja 3D numeričkih modela u projektiranju tunela

Mance

Jovančević

Peranić

2022

Zb. rad. (Građev. fak. Rij., Online)

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Design of Split Hexagonal Patch Array Shaped Nano-metaabsorber with Ultra-wideband Absorption for Visible and UV Spectrum Application

et al. 2019

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Solar energy is one of the ambient sources where energy can be scavenged easily without pollution. Intent scavenging by the solar cell to recollect energy requires a state-of-the-art technique to expedite energy absorption to electron flow for producing more electricity. Structures of the solar cell have been researched to improve absorption efficiency, though most of them can only efficiently absorb with narrow-angle tolerance and polarization sensitivity. So, there is a strong demand for broadband absorption with minimal polarization sensitivity absorber, which is required for effective solar energy harvesting. In this paper, we proposed a new Split Hexagonal Patch Array (SHPA) shape metamaterial absorber with Double-negative (DNG) characteristics, which will provide a wide absorption band with low polarization sensitivity for solar spectrum energy harvesting. The proposed new SHPA shape consists of six nano-arms with a single vertical split which with arrowhead symmetry. This arm will steer electromagnetic (EM) resonance to acquire absolute negative permittivity and permeability, ensuring DNG property. This DNG metamaterial features analyzed based on the photoconversion quantum method for maximum photon absorption. The symmetric characteristics of the proposed structure enable the absorber to show polarization insensitivity and wide incident angle absorption capabilities. Simulated SHPA shows a visible and ultraviolet (UV) spectrum electromagnetic wave absorption capacity of more than 95%. The quantum method gives an advantage in the conversion efficiency of the absorber, and the numerical analysis of the proposed SHPA structure provides absorbance quality for THz regime energy harvesting through solar cell or photonic application.

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Focusing, Imaging and Fourier Transforming With a Large Numerical Aperture, Dielectric Flat Photonic Crystal Lens in Metamaterial Regime

Çolak

Cakmak

2019

Commun.Fac.Sci.Univ.Ank.Series A2-A3: Phys.Sci. and Eng.

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An untraditional Gradient Index Photonic Crystal (GRIN PC) is employed within the long wavelength regime to exhibit focusing, imaging and Fourier Transforming. A very large numerical aperture is aimed by breaking the paraxial wave approximation and the slowly changing refractive index assumption. This untraditional GRIN PC is shown to exhibit very similar lensing characteristics as its analytically solvable counterparts demonstrate. The results suggest that Fourier Transforming together with Fractional Fourier Transforms can be obtained from the present design. The performance of the GRIN PC lens is very much dependent on the excitation source as it is expected from GRIN optics and adiffractional propagating beams over large distances can be obtained.

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Disorder in Metamaterials

Cited by 3 publications

References 110 publications

Prednosti korištenja 3D numeričkih modela u projektiranju tunela

Prednosti korištenja 3D numeričkih modela u projektiranju tunela

Design of Split Hexagonal Patch Array Shaped Nano-metaabsorber with Ultra-wideband Absorption for Visible and UV Spectrum Application

Focusing, Imaging and Fourier Transforming With a Large Numerical Aperture, Dielectric Flat Photonic Crystal Lens in Metamaterial Regime

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