The role of nanoparticles concentration in the emission intensity enhancement of the laser-produced aluminum plasma

2021 ◽  
pp. 413620
Author(s):  
S. Jamil ◽  
U. Liaqat ◽  
N. Ahmed ◽  
R. Ahmed ◽  
Z.A. Umar ◽  
...  
Keyword(s):  
Emission Intensity ◽  
Intensity Enhancement ◽  
Nanoparticles Concentration ◽  
Aluminum Plasma

The changing role of global value chains in CO2 emission intensity in 2000–2014

2021 ◽  
Vol 93 ◽  
pp. 105053
Author(s):  
Danyang Zhang ◽  
Hui Wang ◽  
Andreas Löschel ◽  
Peng Zhou
Keyword(s):  
Emission Intensity ◽  
Co2 Emission ◽  
Global Value Chains ◽  
Value Chains ◽  
Co2 Emission Intensity ◽  
Changing Role

scholarly journals Numerical Solution of Non-Newtonian Fluid Flow Due to Rotatory Rigid Disk

Symmetry ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 699 ◽  
Author(s):  
Khalil Ur Rehman ◽  
M. Y. Malik ◽  
Waqar A Khan ◽  
Ilyas Khan ◽  
S. O. Alharbi
Keyword(s):  
Brownian Motion ◽  
Newtonian Fluid ◽  
Fluid Model ◽  
Rotating Disk ◽  
Casson Fluid ◽  
Infinite Domain ◽  
Nanoparticles Concentration ◽  
Navier’S Slip ◽  
Local Sherwood Number

In this article, the non-Newtonian fluid model named Casson fluid is considered. The semi-infinite domain of disk is fitted out with magnetized Casson liquid. The role of both thermophoresis and Brownian motion is inspected by considering nanosized particles in a Casson liquid spaced above the rotating disk. The magnetized flow field is framed with Navier’s slip assumption. The Von Karman scheme is adopted to transform flow narrating equations in terms of reduced system. For better depiction a self-coded computational algorithm is executed rather than to move-on with build-in array. Numerical observations via magnetic, Lewis numbers, Casson, slip, Brownian motion, and thermophoresis parameters subject to radial, tangential velocities, temperature, and nanoparticles concentration are reported. The validation of numerical method being used is given through comparison with existing work. Comparative values of local Nusselt number and local Sherwood number are provided for involved flow controlling parameters.

Role of Al in engineering the optical band gap and PL emission intensity properties of CdO thin films grown by SILAR method

2022 ◽  
Vol 123 ◽  
pp. 111921
Author(s):  
Harun Güney ◽  
Demet İskenderoğlu ◽  
Muhammed Emin Güldüren ◽  
Sibel Morkoç Karadeniz
Keyword(s):  
Thin Films ◽  
Band Gap ◽  
Emission Intensity ◽  
Optical Band Gap ◽  
Silar Method ◽  
Pl Emission ◽  
Cdo Thin Films

Effect of an Anchor Geometry on the Hydrodynamic Characteristics of a Nanofluid in Agitated Tank

2021 ◽  
Vol 409 ◽  
pp. 179-193
Author(s):  
Abderrahim Mokhefi ◽  
Mohamed Bouanini ◽  
Mohammed Elmir ◽  
Pierre Spitéri
Keyword(s):  
Tilt Angle ◽  
Axial Flow ◽  
Alumina Nanoparticles ◽  
Hydrodynamic Characteristics ◽  
Hydrodynamic Behavior ◽  
Flat Bottom ◽  
Nanoparticles Concentration ◽  
Anchor Design ◽  
The Impact

In this paper, the flow of a shear thinning nanofluid in a mechanically stirred tank has been numerically analyzed. This tank is cylindrical with a flat bottom. It is filled with Al2O3 nanoparticles suspended in the base fluid and equipped with an anchor-type stirrer whose shape is tilted upwards at an angle α. The purpose of this research is to study the impact of the tilt angle (0≤α≤π/6) and the effect of the alumina nanoparticles concentration (0≤φ≤0.1) on the hydrodynamic behavior and energy consumption. In the new anchor design (α>0), the fluid volume that is swept during the rotation of the anchor is the same as that in the case of a standard anchor (α=0). The laminar flow of the nanofluid is governed by the continuity and momentum equations taking into account the physical properties of the nanofluid introduced through correlations cited in the literature. The results obtained have shown that the tilt angle significantly contributes to the reduction of the power number, and leads to a decrease in the intensity of the tangential flow at the level of the extreme transverse planes of the tank. However, this reduction in intensity is compensated by increasing the axial flow. The use of nanoparticles in this work aims to show the role of the new design of anchor in creating a vortex at the bottom of the tank and to avoid of particles sedimentation.

The Role of Aluminium Source (Al2O3/AlN) in the Synthesis of the Ca-α-SiAlON:Eu2+ Phosphor

2016 ◽  
Vol 697 ◽  
pp. 311-317
Author(s):  
Tomasz Pawlik ◽  
Daniel Michalik ◽  
Małgorzata Sopicka-Lizer ◽  
Aleksandra Miczek ◽  
Paweł Krzywda ◽  
...  
Keyword(s):  
Solid Solution ◽  
Chemical Composition ◽  
Solid State ◽  
Solid State Reaction ◽  
Emission Intensity ◽  
Carbon Addition ◽  
Photoluminescence Properties ◽  
Phosphor Powder ◽  
Rich Liquid

The purpose of the presented research was to compare the effect of changing the aluminium source in the mixture of initial powders on the properties of the final phosphor powder of Ca – α-SiAlON doped with Eu2+. The phosphor composition was designed as Eu0,048Ca0,752Si9,6Al2,4O0,8N15,2 and it was prepared by the solid state reaction in a temperature range of 1450-1650 °C. AlN and/or η-Al2O3 powders were used as a source of aluminium. It has been found that presence of aluminium nitride or oxide in the mixture of initial materials significantly changed the course of α-sialon formation, chemical composition of that solid solution and the resultant photoluminescence properties. It has been established that a small amount of η-Al2O3 with a suitable carbon addition was profitable for liquid formation and enhanced crystallization of Ca,Eu-α-sialon. The excessive oxide-rich liquid at reaction temperature led to sintering of phosphor particles and decreased emission intensity while lack of sufficient amount of liquid (nitrogen-rich starting composition) resulted in AlN presence and considerably reduced emission intensity of this phosphor.

Effect of B2O3 on Long-Last Phosphorescence of SrAl2O4:Eu2+,Dy3+

2009 ◽  
Vol 610-613 ◽  
pp. 403-407 ◽  
Author(s):  
Yu Hua Wang ◽  
Xin Yu Song ◽  
Shui He Zhang
Keyword(s):  
Solid State ◽  
Decay Time ◽  
Solid State Reaction ◽  
Emission Intensity ◽  
Emission Spectra ◽  
Persistent Luminescence ◽  
Uv Emission ◽  
Luminescence Time ◽  
Complex Cluster

A series of Sr0.95Al2O4:Eu2+0.02, Dy3+ 0.03•nB2O3 (0≤n≤0.30) were prepared by a solid state reaction. The role of B2O3 on the photoluminescence (PL) properties of Sr0.95Al2O4:Eu2+0.02, Dy3+0.03 were evaluated with UV emission spectra and decay curves. B2O3 significantly improved the emission intensity and persistent luminescence time. The crystal environment and defects induced by B3+ doping were detected with IR spectra, thermoluminescence and positron annihilation (PA) methods. Some Al3+ were substituted by B3+ and a kind of defect complex cluster responsible for the long decay time was formed when the substitution of Al3+ by B3+ occurs.

scholarly journals Low Carbon Urban Transitioning in Shenzhen: A Multi-Level Environmental Governance Perspective

2016 ◽  
Author(s):  
Zhanglan Wu ◽  
Jie Tang ◽  
Dong Wang
Keyword(s):  
Climate Change ◽  
Emission Intensity ◽  
Carbon Emission ◽  
Environmental Governance ◽  
Transformation Process ◽  
Total Carbon ◽  
Low Carbon ◽  
Carbon Emission Intensity ◽  
Low Carbon City

As the world’s second largest economy, China ranks amount the world’s top nations when it comes to carbon emission, and therefore its attitude towards climate change is closely followed by all parties concerned. There have been few researches on the role of environmental governance in low-carbon city transformation process, especially the Chinese one. This paper analyses the role of government environmental regulation played in the low-carbon city transformation process by taking Shenzhen as the research object. One of the world's youngest super cities, it also happens to be the lowest carbon emission intensity city in China. Striving to explore green low-carbon development path for the whole country, Shenzhen provides practical experience for countries to cope with global climate change. However, its efforts to reduce the total carbon emissions failed, but it emphasized the carbon emission intensity, which is consistent with the international commitments made by the central government. China’s policy towards handling climate change relies on hierarchical governance arrangement. The strength of the NGOs in the country is weak and incomparable with the government’s, which has mastered most of the resources and is just a reality in China.

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