Study on Energy Splitting of γ-LiAlO2:Fe3+ Ceramic as a Functional Inorganic Material Sintered by Microwave Based on Material Applications

2012 ◽  
Vol 583 ◽  
pp. 379-382 ◽  
Author(s):  
Yi Huang ◽  
Feng Miao
Keyword(s):  
Factor Model ◽  
Photo Luminescence ◽  
Energy Splitting ◽  
Functional Material ◽  
Experiment Data ◽  
Crystal Field Theory ◽  
Microwave Furnace ◽  
Calculation Results ◽  
Multi Mode ◽  
Good Agreement

The γ-LiAlO2: Fe3+ ceramics were successfully fabricated by using multi-mode cavity microwave furnace, which can be used as an optical functional material. The sample’s photo luminescence spectrum was measured at room temperature. There are six bands in the range of 12000-25000 cm-1. Using the crystal-field theory and introducing the average covalent factor model, we calculated the energy splittings of Fe3+ ions in γ-LiAlO2. These bands were firstly explained and assigned and calculation results are in good agreement with the optical experiment data. All results can be used for the production of optical devices.

Theoretical Investigation of Energy Splitting of γ-LiAlO2: Co3+ Ceramic

2012 ◽  
Vol 571 ◽  
pp. 81-85
Author(s):  
Yi Huang ◽  
Feng Miao ◽  
Jian Ma
Keyword(s):  
Room Temperature ◽  
Factor Model ◽  
Energy Splitting ◽  
Photoluminescence Spectra ◽  
Experiment Data ◽  
Crystal Field Theory ◽  
Microwave Furnace ◽  
Calculation Results ◽  
Multi Mode ◽  
Good Agreement

The γ-LiAlO2:Co 3+ ceramics were successfully fabricated by using multi-mode cavity microwave furnace, and the sample’s infrared absorption and photoluminescence spectra were measured at room temperature. There are nine bands in the range of 1300-48000 cm-1. Using the crystal-field theory and introducing the average covalent factor model, we calculated the energy splittings of Co3+ ions in γ-LiAlO2. These bands were firstly explained and assigned. These calculation results are in good agreement with the optical experiment data.

Spectroscopic Investigation of γ-LiAlO2 Ceramic Doped with Tetrahedrally Coordinated Cr3+ Ions

2013 ◽  
Vol 785-786 ◽  
pp. 701-705
Author(s):  
Jian Ma
Keyword(s):  
Room Temperature ◽  
Near Infrared ◽  
Factor Model ◽  
Infrared Region ◽  
Experiment Data ◽  
Crystal Field Theory ◽  
Microwave Furnace ◽  
Calculation Results ◽  
Multi Mode ◽  
Good Agreement

The γ-LiAlO2: Cr3+ ceramics were successfully fabricated using multi-mode cavity microwave furnace, and the samples absorption spectrum was measured at room temperature. There are five bands in the red and near-infrared region. Using the crystal-field theory and introducing the average covalent factor model, we calculated the energy-level splitting of Cr3+ ions in γ-LiAlO2 and successfully explained these bands. These calculation results are in good agreement with the optical experiment data.

Spectroscopic Investigation of V3+:YAG Crystal

2013 ◽  
Vol 774-776 ◽  
pp. 811-815 ◽  
Author(s):  
Jian Ma
Keyword(s):  
Room Temperature ◽  
Factor Model ◽  
Theoretical Calculations ◽  
Czochralski Method ◽  
Experiment Data ◽  
Crystal Field Theory ◽  
Calculation Results ◽  
First Time ◽  
Pure Argon Atmosphere ◽  
Good Agreement

V3+ions doped YAG crystals were grown using the Czochralski method in a highly pure argon atmosphere. The transmission spectrum of trivalent vanadium in YAG crystal has been measured at room temperature. Eight bands were observed in which two bands centered at 690nm (14493cm-1) and 1490nm (6711cm-1) are reported for the first time. By using the crystal-field theory and introducing the average covalent factor model, we also presented the theoretical calculations of the energy level splitting of tetrahedrally coordinated V3+impurity systems in YAG crystal. These calculation results are in good agreement with the optical experiment data.

Numerical Simulation of Optimized Forebay of Pumping Station

2009 ◽  
Author(s):  
Li Cheng ◽  
Jiren Zhou
Keyword(s):  
Numerical Simulation ◽  
Large Scale ◽  
Experiment Data ◽  
Pumping Station ◽  
Calculation Results ◽  
Simplec Algorithm ◽  
Original Scheme ◽  
Volume Method ◽  
Calculated Model ◽  
Good Agreement

The incompressible N-S equations are solved by the finite volume method. Based on the standard k-e model, the SIMPLEC algorithm is applied for the solution of the discretization governing equation. Using CFD, the flow pattern in the forebay of pumping station is revealed. The calculation results showed that there were large scale recirculation in the forebay of original scheme and the flow patterns of optimized forebay with bottom sills were improved. The calculated results were in good agreement with experiment data, which show that the calculated model was reliable and practical.

NUMERICAL MODEL TO SIMULATE THE EROSION ON THE SLOPE DUE TO OVERTOPPING

2010 ◽  
Vol 13 (3) ◽  
pp. 78-87
Author(s):  
Hoai Cong Huynh
Keyword(s):  
Numerical Model ◽  
Flow Model ◽  
Bed Load ◽  
Experiment Data ◽  
Step Method ◽  
Morphological Model ◽  
Load Transport ◽  
Bed Load Transport ◽  
The Finite Difference Method ◽  
Good Agreement

The numerical model is developed consisting of a 1D flow model and the morphological model to simulate the erosion due to the water overtopping. The step method is applied to solve the water surface on the slope and the finite difference method of the modified Lax Scheme is applied for bed change equation. The Meyer-Peter and Muller formulae is used to determine the bed load transport rate. The model is calibrated and verified based on the data in experiment. It is found that the computed results and experiment data are good agreement.

Numerical Simulation of Cavitating Flow in a Francis Turbine

2008 ◽  
Author(s):  
Lingjiu Zhou ◽  
Zhengwei Wang ◽  
Yongyao Luo ◽  
Guangjie Peng
Keyword(s):  
Numerical Simulation ◽  
Transport Equation ◽  
Flow Rate ◽  
Suction Side ◽  
Cavitating Flow ◽  
Francis Turbine ◽  
Efficiency Change ◽  
Experiment Data ◽  
Calculation Results ◽  
Vapor Fraction

The 3-D unsteady Reynolds averaged Navier-tokes equations based on the pseudo-homogeneous flow theory and a vapor fraction transport-equation that accounts for non-condensable gas are solved to simulate cavitating flow in a Francis turbine. The calculation results agreed with experiment data reasonably. With the decrease of the Thoma number, the cavity first appears near the centre of the hub. At this stage the flow rate and the efficiency change little. Then the cavity near the centre of the hub grows thick and the cavities also appear on the blade suction side near outlet. With further reduce of the Thoma number the cavitation extends to the whole flow path, which causes flow rate and efficiency decrease rapidly.

A Streamline Curvature Method for Calculating S1 Stream Surface Flow

1984 ◽  
Vol 106 (2) ◽  
pp. 306-312
Author(s):  
S. K. Mao ◽  
D. T. Li
Keyword(s):  
Surface Flow ◽  
Approximation Technique ◽  
Flow Section ◽  
Boolean Expression ◽  
Simple Method ◽  
Stream Surface ◽  
Streamline Curvature ◽  
Calculation Results ◽  
Good Agreement ◽  
Streamline Curvature Method

A streamline curvature method for calculating S1 surface flow in turbines is presented. The authors propose a simple method in which a domain of calculation can be changed into an orderly rectangle without making coordinate transformations. Calculation results obtained on subsonic and transonic turbine cascades have been compared with those of experiment and another theory. Good agreement has been found. When calculating blade-to-blade flow velocity at subsonic speed, a function approximation technique can be used in lieu of iteration method in order to reduce calculation time. If the calculated flow section is of a mixed (subsonic-supersonic) flow type, a Boolean expression obtained from the truth table of flow states is proposed to judge the integrated character of the mixed flow section. Similarly, another Boolean expression is used to determine whether there exists a “choking” of the relevant section. Periodical conditions are satisfied by iterating the first-order derivative of stagnation streamline, which is formed simultaneously. It can be proved that the stagnation streamline formed in this way is unique.

Study on Roll Wear Model for Hot Strip Mill

2012 ◽  
Vol 535-537 ◽  
pp. 697-700
Author(s):  
Zhong Feng Guo ◽  
Jun Hong Hu ◽  
Xue Yan Sun
Keyword(s):  
Work Roll ◽  
Hot Strip Mill ◽  
Rolling Schedule ◽  
Wear Model ◽  
C Language ◽  
Hot Strip ◽  
Roll Wear ◽  
Calculation Results ◽  
Strip Length ◽  
Good Agreement

Roll wear model for Hot Strip Mill (HSM) was researched and the factors affect roll wear are analyzed. The simulation program was compiled by program visual C++ language and work roll wear was calculated according to the rolling schedule. Calculation results shows that roll wear like box shape. Strip width affects roll wear clearly. The strip length is one of the important issues which affect roll wear. Work roll wear of F7 top roll middle get to 280μm after a rolling schedule. Roll wear curve calculated by program were good agreement with the wear curve got by high-precision grinder. The results show that the roll wear model has high accuracy.

Comparative Calculations of TROI TS-2 and TS-3 Steam Explosion Experiments With TEXAS-V

2017 ◽  
Author(s):  
Taehoon Kim ◽  
Sukyoung Pak ◽  
Yongjin Cho
Keyword(s):  
Void Fraction ◽  
Steam Explosion ◽  
Peak Pressure ◽  
Severe Accident ◽  
Experiment Data ◽  
Trigger Time ◽  
Vessel Reactor ◽  
The Moment ◽  
Containment Integrity ◽  
Good Agreement

During a severe accident, contact of the molten corium with the coolant water may cause an energetic steam explosion which is a rapid increase of explosive vaporization by transfer to the water of a significant part of the energy in the corium melt. This steam explosion has been considered as an adverse effect when the water is used to cool the molten corium and could threaten reactor vessel, reactor cavity, containment integrity. In this study, TROI TS-2 and TS-3 experiments as part of the OECD/SERENA-2 project were analyzed with TEXAS-V. Input parameters were based on actual TROI experiment data. In mixing simulations, calculated results were compared to melt front behavior, void fraction in trigger time and other parameters in experiment results. In explosion simulations, corresponding to TROI experiments an external triggering was employed at the moment that melt front reached heights of 0.4 m. Calculated results of peak pressure and impulse at the bottom were compared with TROI experiment results. Melt front behaviors of the melt was different from the experimental results in both TS-2 and TS-3. Void fraction in triggering time in TS-2 was in good agreement with the experiment results and in TS-3 was slightly overestimated. The peak pressure and impulse at bottom were successfully predicted by TEXAS-V. These calculations will allow establishing whether the limitations and differences observed in the simulations of the experiments are important for the reactor case.

In-Plane Force Effect of Reinforced Concrete Beam with Elastic Supports

2011 ◽  
Vol 287-290 ◽  
pp. 1896-1901
Author(s):  
Zhi Kun Guo ◽  
Wan Xiang Chen ◽  
Qi Fan Wang ◽  
Yu Huang ◽  
Chao Pu Li ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Nonlinear Characteristics ◽  
Elastic Supports ◽  
Calculation Results ◽  
Basic Equations ◽  
First Time ◽  
Good Agreement

The bearing capacities of one-way reinforced concrete beams with elastic supports are investigated in this paper. According to the nonlinear characteristics of the beams, the basic equations based on plastic theory of concrete are derived by considering the in-plane force effects that aroused by the constraints of supports when the beams deforming. It is indicated that the calculation results are in good agreement with experimental datum, and the influences of different supports on the bearing capacities of the beams are quantitatively given for the first time.

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