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The Effect of TiO2 on Optical and Radiation Shielding Properties of BaO B2O3 Glasses
Heba A. Saudi,
Ghada Adel
Issue:
Volume 7, Issue 1, June 2018
Pages:
1-6
Received:
13 December 2017
Accepted:
25 December 2017
Published:
16 January 2018
Abstract: The optical properties of a new family of x TiO2 (65-x) B2O335BaO glasses are investigated. The optical parameters such as average single bond strength, optical electronegativity, optical energy gap, refractive index, optical basicity and third order nonlinear susceptibility are discussed with respect to titanium concentration. Gamma ray transmission and the parameters which affect these processes; attenuation coefficients and half value layer, were studied using the mixture rule of the XCOM program, in the energy range (1 keV-100 GeV). The results obtained probably provide good biased for prediction of new nonlinear materials and can be used as an environmentally friendly substitute for lead for industries besides their radiation-shielding property.
Abstract: The optical properties of a new family of x TiO2 (65-x) B2O335BaO glasses are investigated. The optical parameters such as average single bond strength, optical electronegativity, optical energy gap, refractive index, optical basicity and third order nonlinear susceptibility are discussed with respect to titanium concentration. Gamma ray transmissi...
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Hydrothermal Synthesis of Tb2 (WO4)3: Eu3+ Phosphors with Controllable Morphology and Multicolor Tunable Luminescence
Li Yuan,
Jianwang He,
Zhulang Qiu
Issue:
Volume 7, Issue 1, June 2018
Pages:
7-12
Received:
6 December 2017
Accepted:
18 December 2017
Published:
18 January 2018
Abstract: Rare earth doped luminescent materials can be used in fluorescent lamps, display devices, biology and many other fields. Especially, phosphors with controllable morphology and multicolor tunable luminescence have many virtues. Thus, the synthesis of suitable phosphors is very important. Among all the synthesis methods, hydrothermal method stands out. Europium activated terbium tungstate (Tb2 (WO4)3: Eu3+) phosphors with controllable morphology have been successfully synthesized by hydrothermal method, followed by a subsequent calcination process. X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) are employed to characterize the samples. Controlling the reaction parameters, a variety of morphology have been obtained. Thanks to the efficient energy transfer from WO42- to Tb3+ to Eu3+, Tb2 (WO4)3: Eu3+ phosphors demonstrate outstanding luminescent properties with tunable colors under ultraviolet (UV) excitation, which makes it possible that the emission colors of Tb2 (WO4)3: Eu3+ phosphors can be altered from green, yellow, orange to red with the doped Eu3+ content increasing. The facile preparation route and multicolor tunable luminescence make the materials promising candidate phosphors applied in future color displays and light-emitting devices.
Abstract: Rare earth doped luminescent materials can be used in fluorescent lamps, display devices, biology and many other fields. Especially, phosphors with controllable morphology and multicolor tunable luminescence have many virtues. Thus, the synthesis of suitable phosphors is very important. Among all the synthesis methods, hydrothermal method stands ou...
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Smart Hospital-Room and Modern Photonics Emerging Clinical Reality Based on Optical Systems
Issue:
Volume 7, Issue 1, June 2018
Pages:
18-31
Received:
9 December 2017
Accepted:
27 December 2017
Published:
19 January 2018
Abstract: Numerous solutions have been proposed for the emerging “Smart Hospital-Room”, however, there is little progress made yet. Interesting approaches include the Amplion Smart (er) Room of the Future, the IBM-UPMC (University of Pittsburgh Medical-Center), the NXT-Health-program of the US-Department of Defense and the EU-Agency for Network and Information Security. Nevertheless, a Hospital Smart-Room has to be cost-effective and it is the aim of this project, to pinpoint the most important catches. Crucial delay-factors and high-cost sources have been traced, by following the innovation trail, as reflected upon numerous Hospital-Technology related Patents and other research Publications, synopsizing the obstacles for achieving an acceptable and interoperable Electronic Medical Record and the enhanced Cognitive-computing based ways to harness, share, manage and trace big-data. On the other hand, increased Patient-interactivity and participation, is a cardinal challenge for the future’s Smart-Room and the Health-care providers need access to real-time, Point-of-care feedback, on a continuous basis. Finally, Technology supporting overloaded clinical-staff causes frequently complications and tension. Therefore, Clinical-workflow improvements require goal-oriented training, based on Patient-care-plans and supported by mature and cost-effective Technologies. Cost, lack of education and short-term focusing lead to cul-de-sac. The Hospital-leaders must realize that the world is changing dramatically; in order to survive, they have to offer Smart, innovative, efficient and above all affordable and cost-effective Health-care. Modern Photonics may improve dramatically the smooth operation of the “Smart Hospital-Room”, as it is proven in the detailed created “Patent mappings” relating Photonics Technology and Health-care.
Abstract: Numerous solutions have been proposed for the emerging “Smart Hospital-Room”, however, there is little progress made yet. Interesting approaches include the Amplion Smart (er) Room of the Future, the IBM-UPMC (University of Pittsburgh Medical-Center), the NXT-Health-program of the US-Department of Defense and the EU-Agency for Network and Informati...
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Analysis on Photo Emission and Absorbing Spectrum on GaN Sample by Finite Difference Time Domain Method
Phyoe Sandar Win,
Kathy Kyaw Min,
Hla Myo Tun,
Zaw Min Naing,
Win Khaing Moe
Issue:
Volume 7, Issue 1, June 2018
Pages:
32-37
Received:
24 June 2018
Accepted:
5 July 2018
Published:
31 July 2018
Abstract: III-Nitride semiconductors are especially capable for both electronics and optical devices. The capability of the III-Nitride semiconductors as light emitters to extent the electromagnetic spectrum from deep ultraviolet light, throughout the whole visible region, and into the infrared part of the spectrum, is a significant characteristic, making this material indispensable for the areas of light emitting devices. The near and far field characteristics of the GaN samples are studied by affecting the finite-difference time domain (FDTD) technique. The far region spreading characteristics at diverse incident angles are also conferred. In addition, the spreading field would be concentrated and the transmission efficiency could be enhanced by the phase shift caused by the dielectric substrate. The intended of optoelectronic devices fictitious from III-Nitride materials is supported by acquaintance of refractive index and absorption coefficient of these materials.
Abstract: III-Nitride semiconductors are especially capable for both electronics and optical devices. The capability of the III-Nitride semiconductors as light emitters to extent the electromagnetic spectrum from deep ultraviolet light, throughout the whole visible region, and into the infrared part of the spectrum, is a significant characteristic, making th...
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Photoluminescence and Lifetime Measurement for the Excitation and Temperature Dependence of Carrier Relaxation in III-V Semiconductors
Kathy Kyaw Min,
Phyoe Sandar Win,
Hla Myo Tun,
Zaw Min Naing,
Win Khaing Moe
Issue:
Volume 7, Issue 1, June 2018
Pages:
38-42
Received:
24 June 2018
Accepted:
6 July 2018
Published:
2 August 2018
Abstract: Researches in the field of III-V semiconductor photonic devices have initiate applications in a number of disciplines including lighting, optical communications and biomedical engineering. One of the limiting factors for getting better the photonic devices is the carrier relaxation time. This is the time obligatory for energetic carriers to cool to the edge of their particular bands in a bulk semiconductor material, or to the bottom of a well throughout inter- and intra-sub-band spreading in a heterojunction structure. From these lower energy states, they can afterwards recombine radiatively in photonic devices. This study exploited the nonlinear optical practice of frequency up conversion to complete time-resolved luminescence spectroscopy on epitaxial bulk GaAs samples to analyse carrier relaxation times in each as a function of excitation irradiance and temperature of the sample. There is no electrons and defect energy level in the energy curve for p-type samples. In this study, we focus on the recombination process of yellow-luminescence, which causes the decrease in emission efficiency. The variation of yellow-photoluminescence spectrum shape and intensity, which is caused by occupation YL centers by electrons and thermal activation processes of energy level transitions of electrons by phonon collision in GaAs. The measurement model explains the dependence of the PL intensity on excitation intensity, as well as the PL lifetime and its temperature dependence. We demonstrate that time-resolved PL measurements can be used to find the concentrations of free electrons and acceptors contributing to PL in p-type semiconductors.
Abstract: Researches in the field of III-V semiconductor photonic devices have initiate applications in a number of disciplines including lighting, optical communications and biomedical engineering. One of the limiting factors for getting better the photonic devices is the carrier relaxation time. This is the time obligatory for energetic carriers to cool to...
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Solving Nonlinear Evolution Equations by (G'/G)-Expansion Method
Attia Rani,
Munazza Saeed,
Muhammad Ashraf,
Rakshanda Zaman,
Qazi Mahmood-Ul-Hassan,
Kamran Ayub,
Muhammad Yaqub Khan,
Madiha Afzal
Issue:
Volume 7, Issue 1, June 2018
Pages:
43-53
Received:
24 June 2018
Accepted:
13 July 2018
Published:
8 August 2018
Abstract: Nonlinear mathematical models and their solutions attain much attention in soliton theory. In this paper, main focus is to find travelling wave solutions of foam drainage equation and NLEE of fourth order. (G'/G)-expansion method is applied on these nonlinear differential equations. Wave transformation is used to convert nonlinear partial differential equation into an ordinary differential equation. It is observed that (G'/G)-expansion method is advanced and easy tool for finding solution of NLEEs in engineering, optics and mathematical physics. The proposed method is highly effective and reliable.
Abstract: Nonlinear mathematical models and their solutions attain much attention in soliton theory. In this paper, main focus is to find travelling wave solutions of foam drainage equation and NLEE of fourth order. (G'/G)-expansion method is applied on these nonlinear differential equations. Wave transformation is used to convert nonlinear partial different...
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Group Theory Analyses of Fano Resonance Spectra in the System of C3v and C4v Metallic Multinanoparticles-Thin Film
Issue:
Volume 7, Issue 1, June 2018
Pages:
54-60
Received:
26 July 2018
Accepted:
13 August 2018
Published:
4 September 2018
Abstract: The original mechanism of Fano resonance spectrum dip resulting from the system of metallic multinanoparticles-thin film belonging to C3v and C4v is deduced in detail using group theory. Based on our previous study, this paper verifies that there is only four LSPP electric dipole moment resonant modes in the system of Cnv mutinanoparticles-thin film according with the same irreducible representation E when illuminated by linearly polarized light: only three of them lie in the plane where the multiparticles locate, and among them, the ring-particles own two, the central particle is one. These results are completely the same with that of Dnh. The direction of the electric dipolar moments is perpendicular to the multiparticles plane although the last one has the same symmetry with the other three, and it is not applied usually to the experimental study or application of surface plasmon resonance relative to the other three. In addition, the systems of metallic nanoparticles-thin film belonging to Cnv and the metallic nanoparticles belonging to Dnh point groups hold the similar spectrum lineshape, however, there is some redshift or blueshift of spectrum dip(peak) in the system of nanoparticles-thin film if the thin film exists. This work can provide some references for designing the optical properties and its extended applications about the system of metallic multinanoparticles-thin film.
Abstract: The original mechanism of Fano resonance spectrum dip resulting from the system of metallic multinanoparticles-thin film belonging to C3v and C4v is deduced in detail using group theory. Based on our previous study, this paper verifies that there is only four LSPP electric dipole moment resonant modes in the system of Cnv mutinanoparticles-thin fil...
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