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    Wyświetlanie 1-13 z 13
    Tytuł:
    The Myth of American Dream
    Autorzy:
    Tittenbrun, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/1194020.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    American Dream
    income gap
    social mobility
    social stratification
    subjectivism
    wealth gap
    Opis:
    The American Dream is a deep-seated element of collective American consciousness. Yet, contrary to any culturalist approaches, there is a need to go beyond the subjective to consider the relationship of the former to the objective social relations. And from this point of view it turns out that the U.S. society fares very poorly on the scale of social mobility and equality. In other words, the said doctrine is but a myth bearing no correspondence to reality.
    Źródło:
    World Scientific News; 2015, 9; 1-16
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Review on Multi-dimensional Zinc Oxide Nanostructures
    Autorzy:
    Acharyya, Sarani
    Acharyya, Swarnali
    Samanta, Pijus Kanti
    Powiązania:
    https://bibliotekanauki.pl/articles/1031833.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Band-gap
    Morphology
    Semiconductor
    Zinc Oxide
    Opis:
    Nanostructured materials are being widely investigated due to their versatile properties leading to promising applications in various areas starting from electronics to environment and medical science. Amongst the various investigated nanostructures, Zinc Oxide (ZnO) is very important because of its versatile properties like high and direct band gap, optical transparency, room temperature ferromagnetism, piezoelectric property and gas sensing property. This mini review article is focused on the morphological study of various ZnO nanostructures starting from hierarchical nanostructures to quantum dots.
    Źródło:
    World Scientific News; 2020, 147; 140-165
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical and Dielectrical Properties of (PEG-CMC) Films Prepared by Drop Casting Method
    Autorzy:
    Abdali, O. Karrar
    Abdulazeez, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1192693.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Optical Properties
    Energy Gap
    PEG and CMC
    Opis:
    Films of PEG after and before doped by carboxymethyle cellulose CMC were deposed on glass substrates by drop casting method. The absorbance and transmittance spectra have been recorded for all the deposited films in order to study the optical constants such as, refractive index, extinction coefficient, optical conductivity, real and imaginary parts of the dielectric constant, these additives effect all the parameters under study and enhance their value especially the optical absorption. The values of absorption coefficient refer to allowed direct transition.
    Źródło:
    World Scientific News; 2016, 46; 189-203
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CdO thin films Grown by Chemical Spray Pyrolysis and Effect of Substrate type on its Optical Properties
    Autorzy:
    Abood, Mohmood Muwafaq
    Jabbar, Wasmaa Abdulsattar
    Daroysh, Hassan Hadi
    Qader, Kameran Yasseen
    Al-Baidhany, Ismaeel A.
    Hussin, Hadi Ahmed
    Jasim, Marwah Nasif
    Powiązania:
    https://bibliotekanauki.pl/articles/1194135.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    CdO
    Optical properties
    Thin Film
    energy gap
    Opis:
    Cadmium oxide (CdO) thin films were formed by chemical spray pyrolysis technique for different substrate type (glass, quartz, ITO). Absorption spectra were recorded from UV-Visible spectrophotometer in the range of 300-900 nm. The absorbance increased when the glass substrate replaced to quartz or ITO substrate, also this behavior for absorption coefficient and extinction coefficient. While the refractive index tack unstable behavior. The energy gap decreased from 2.4 eV for CdO thin film deposited on glass substrate to 2.36 eV for CdO thin film deposited on ITO substrate.
    Źródło:
    World Scientific News; 2016, 57; 41-47
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of ZnO thin film using sol-gel dip-coating technique and their characterization for optoelectronic applications
    Autorzy:
    Chaudhary, Preeti
    Kumar, Vipin
    Powiązania:
    https://bibliotekanauki.pl/articles/1075562.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Band gap
    SEM
    XRD
    ZnO
    dip coating
    Opis:
    ZnO thin film with an aim to employ in opto-electronic applications was prepared using sol-gel dip-coating route and thereafter sintered at temperature 500 ºC. The film has been investigated by XRD pattern, SEM, UV-Vis and photoluminescence spectroscopy for physical and optical characterization of ZnO thin film. X-Ray diffraction pattern analysis reveals the polycrystalline nature with hexagonal wurtzite structure having orientation along the plane (002). Scanning electron micrograph shows symmetrical dense ZnO rod throughout the surface. The diffuse reflectance spectrum is studied in the range of wavelength 300-800 nm. A band gap of 3.21 eV is calculated using Kubelka-Munk function. PL spectrum shows strong peak at 380 nm due to oxygen vacancy of ZnO.
    Źródło:
    World Scientific News; 2019, 121; 59-66
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and Optical Properties of Sol-Gel Derived Dip-Coated CdO Thin Film
    Autorzy:
    Kumari, Renu
    Kumar, Vipin
    Powiązania:
    https://bibliotekanauki.pl/articles/1159724.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Band gap
    CdO
    Sol-gel dip coating
    Thin film
    Opis:
    In this paper CdO thin film has been prepared by sol-gel dip-coating method on glass substrate. The film was characterized by X-Ray diffraction, UV-Visible spectroscopy and photoluminescence spectroscopy for structural and optical properties of CdO thin film. The XRD pattern shows that film is polycrystalline in nature and has a cubical structure with orientation along (111) plane. The diffuse reflectance spectra for the film is studied in wavelength range 400-800 nm. The direct energy band gap of 2.50 eV is found for the film using modified Kubelka-Munk function. Photoluminescence spectra shows one sharp peak at 540 nm due to oxygen vacancy of cadmium oxide.
    Źródło:
    World Scientific News; 2018, 113; 210-217
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical study of the effect the hydroxyl subgroups on the electronic properties of iso-indene molecule
    Autorzy:
    Obayes, Abbas Ibrahim
    Hasan, Nahida B.
    Aboud, Hamed Ibrahem
    Mohammed, Mohammed Ahmed
    Powiązania:
    https://bibliotekanauki.pl/articles/1191969.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    DFT
    energy gap
    ionization potential
    hardness and IR-spectrum
    Opis:
    In this work, six molecules model are optimized at B3LYP/6-31G** density functional theory. Electronic properties of iso-indene molecules were investigated depending on the three parameters (B3LYP) by density functional theory method. The best geometry for all molecules were investigated at (6-31G**) basis sets. The total energies, energy gaps, ionization potentials, electron affinities and softness were calculated for the studied molecules. Adding the (OH) ion and Nitrogen, Sulfur atoms to the iso-indene molecules leads to decrease the energy gap and the hardness of the studied molecules. The IR-spectra shows the effect of adding the (OH) ion and Nitrogen, Sulfur atoms in the ring on the vibrations of the reference molecule, the electronic properties and IR spectrum for all molecules were investigated by Gaussian 03 program.
    Źródło:
    World Scientific News; 2016, 50; 49-63
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and Theoretical Investigation to Study the Molecular Structure, Electronic Properties, UV–Vis Spectra of Coumarin 102
    Autorzy:
    Mohi, Ali T.
    Abood, Tareq H.
    Hadi, Hasan A.
    Karim, Mahmood S.
    Mutlik, Falah A-H.
    Alwan, Tariq J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1178533.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    DFT
    Ionization potential
    TDDFT
    electron affinity
    energy gap and UV spectra
    Opis:
    In this work, we study the structure, electronic properties and electronic spectra of Coumarin 102 (C102) dissolved in ethanol as an experimental-theoretical investigation. The various properties of the ground and excited electronic states of coumarins 102 using density functional theory (DFT) and time-dependent density functional theory (TDDFT) was calculated by the B3LYP density functional model with 6-31G(d,p) basis set by Gaussian 09 W program. Spectral characteristics of coumarin 102 have been probed into by methods of experimental UV-visible, and quantum chemistry. The UV spectrum was measured in Ethanol. The optimized structures, total energies, electronic states (HOMO- LUMO), energy gap, ionization potentials, electron affinities, chemical potential, global hardness, softness, global electrophilictity, dipole moment and electrostatic potential was calculated. were calculated. We find good agreement between experimental data of UV spectrum and TDDFT excitation energies.
    Źródło:
    World Scientific News; 2017, 70, 2; 216-229
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of planar plasma diode
    Autorzy:
    Wijewardena Gamalath, K. A. I. L.
    Samarakoon, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/412368.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Plasma diode
    plasma boundary
    current density
    Particle-In-Cell simulation
    anode cathode gap
    potential field
    Opis:
    To investigate the dynamics of a planar plasma diode system (PDS), a model based on the current density equilibrium at the interface was developed. The current densities and plasma boundary variations with the potential fields were obtained by simulating a single square pulse. The variation of an observed overshoot current density with the applied voltage is presented. Planar plasma diode system was also simulated for periodic, sine, square, triangular and saw tooth voltage patterns by varying the amplitude and frequencies. A method to find the lower bound of the electron density of plasma for a specified PDS is presented. Particle-In-Cell simulation technique was used to investigate the plasma particles and electric field distributions over the anode cathode gap for different intensities of external electric fields. The system became stable after few time steps and this time depends upon the intensity and polarization of the external field.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 8, 3; 220-242
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and investigation of optical, structural, and morphological characteristics of nanostructured TiO2-ZnO thin films
    Autorzy:
    Yasir, Nagham Abdulameer
    Hlail, Alzubaidy Muneer
    Mohsin, Ali Kamel
    Powiązania:
    https://bibliotekanauki.pl/articles/1070855.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Crystallite size
    Photocatalysis
    Sol–gel process
    Titanium dioxide
    X-Ray Diffraction
    Zinc oxide
    drop casting
    energy gap
    thin films
    Opis:
    TiO2-ZnO thin films have been prepared by using drop casting technique. The optical, structural, and morphological properties of nanostructured TiO2-ZnO thin films deposited by drop casting technique was studied by using several experimental techniques were used to characterize optical, structural, and morphological properties; X-Ray Diffraction (XRD) was used to study the crystal structures, the crystallite size, the dislocation density, and the number of crystallites per unit area of TiO2-ZnO thin films. The surface topography, surface roughness parameters, and average grain size for all samples were done by Atomic Force Microscopy (AFM) micrograph which confirm the existence of Nano-structured thin films. The optical energy gap of the TiO2-ZnO thin films was determined by using UV spectroscopy. It was found that one type of basic electrons transitions, through which the values of the optical energy gap for all the prepared thin films which are allowed direct transition.
    Źródło:
    World Scientific News; 2019, 123; 87-101
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Properties of (SnO2)1-x(ZnO)x Thin Films Prepared by Spray Paralysis Technique
    Autorzy:
    Nahida, Bukhееt Hasan
    Zahra'a, Adеl Jawad
    Mohammed, Ahmed Mohammed
    Huda, Bukhееt Hasan
    Powiązania:
    https://bibliotekanauki.pl/articles/1179187.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    optical propеrtiеs
    spray pyrolysis tеchniquе
    thin films
    еnеrgy gap
    Opis:
    Thе study of thе optical propеrtiеs is usеful in thе task of dеtеrmining thе naturе of thе practical application that can bе usеd to rеcord film matеrial. Thе optical propеrtiеs of thе mixеd (SnO2)1−x(ZnO)x thin films dеpositеd on a glass substratе by spray pyrolysis tеchniquе (SPT) at a substratе tеmpеraturе 400 °C havе bееn invеstigatеd by thе transmission spеctra at room tеmpеraturе wеrе mеasurеd in thе rangе from 300 to 1100 nm.Thе optical study rеvеalеd that thе films wеrе highly absorbеd with a dirеct typе of transition. Also thе dirеct еnеrgy gap was obsеrvеd to incrеasе with incrеasing of ZnO Vol.%
    Źródło:
    World Scientific News; 2017, 83; 182-193
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of two dimensional photonic band gaps
    Autorzy:
    Dissanayake, S. E.
    Wijewardena Gamalath, K. A. I. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/411904.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Photonic crystal
    square lattice
    triangular lattice
    honeycomb lattice
    plane wave expansion
    mode field distribution
    GaAs
    dielectric kontrast
    filling fraction
    gap maps
    Opis:
    The plane wave expansion method was implemented in modelling and simulating the band structures of two dimensional photonic crystals with square, triangular and honeycomb lattices with circular, square and hexagonal dielectric rods and air holes. Complete band gaps were obtained for square lattice of square GaAs rods and honeycomb lattice of circular and hexagonal GaAs rods as well as triangular lattice of circular and hexagonal air holes in GaAs whereas square lattice of square or circular air holes in a dielectric medium ε = 18 gave complete band gaps. The variation of these band gaps with dielectric contrast and filling factor gave the largest gaps for all configurations for a filling fraction around 0.1.The gap maps presented indicated that TM gaps are more favoured by dielectric rods while TE gaps are favoured by air holes. The geometrical gap maps operating at telecommunication wavelength λ = 1.55 m showed that a complete band gap can be achieved for triangular lattice with circular and hexagonal air holes in GaAs and for honeycomb lattice of circular GaAs rods.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 5; 58-88
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Gauge Model for Gravity and considerations on the Asymmetry of Time and the SU (2) Mass Gap
    Autorzy:
    Kabe, Koustubh
    Powiązania:
    https://bibliotekanauki.pl/articles/1178329.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Gauge theory
    general relativity
    gravity
    loop quantum gravity
    mass gap
    quantum field theory
    quantum gravity
    string theory
    super gravity (SUGRA)
    super symmetry (SUSY)
    time
    time asymmetry
    Opis:
    A new formulation of the Hamiltonian formalism of general relativity is developed based on the adiabatic variation of the Hamiltonian constraint. This new formulation consists of complex valued anti-Hermitian 1- called the Berry gauge potentials. These are then used to develop the complex Berry-Einstein-Yang-Mills curvature 2- . The Berry-Yang-Mills field equations are then developed and interpreted in a novel manner to incorporate quantum temporal strings in the non-perturbative formalism. This is however just highlighted in this paper and will be pursued in another paper. Since, the holonomy phase construed is that of Lorentz rotation we perceive a new quantum structure of the space-time namely that of causality. The future light cones are soldered internally to the tensor fields naturally so that the Berry-Ehresmann connection defines a quantum gauge field of causality. This field evokes the causal structure attributed to space-time as gauge degrees of freedom of quantum space ― a fluid of future light cones. This symmetry being of the gauge field type has three generators i.e., three gauge bosons― all heavy and therefore attracted by gravity. Thus causality is a local gauge degree of freedom of gravity. Once the theory is developed, the problem of the mass gap is considered for our gauge field. It seems that the problem is solved in this paper.
    Źródło:
    World Scientific News; 2017, 81, 2; 198-220
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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