scholarly journals A versatile apparatus for on-line emission channeling experiments

2013 ◽  
Vol 84 (7) ◽  
pp. 073506 ◽  
Author(s):  
M. R. Silva ◽  
U. Wahl ◽  
J. G. Correia ◽  
L. M. Amorim ◽  
L. M. C. Pereira
Keyword(s):  
Line Emission ◽  
On Line ◽  
Emission Channeling

scholarly journals Lattice location and thermal stability of implanted nickel in silicon studied by on-line emission channeling

2014 ◽  
Vol 115 (2) ◽  
pp. 023504 ◽  
Author(s):  
D. J. Silva ◽  
U. Wahl ◽  
J. G. Correia ◽  
L. M. C. Pereira ◽  
L. M. Amorim ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Line Emission ◽  
Lattice Location ◽  
On Line ◽  
Thermal Stability Of ◽  
Emission Channeling

Experiments and Modelling of Producer Gas Based Reciprocating Engines

2002 ◽  
Author(s):  
G. Sridhar ◽  
P. J. Paul ◽  
H. S. Mukunda
Keyword(s):  
Flame Propagation ◽  
Three Dimensional ◽  
Line Emission ◽  
Performance Testing ◽  
Propagation Speed ◽  
Producer Gas ◽  
Transient Effects ◽  
Ignition Timing ◽  
Piston Bowl ◽  
On Line

A 20 kW reciprocating engine is operated using producer gas derived from a modern open top downdraft re-burn biomass gasifier that has been evaluated by rigorous laboratory performance testing over several hundred hours. The engine is operated at varying compression ratio (CR) from 11.5 to 17.0 and ignition timings from 30 to 6° before Top Centre (TC). The engine – alternator system is characterised for its performance by the simultaneous measurement of gas and airflow rates, gas composition (on-line), emission levels and power delivered. It is also instrumented to obtain the in-cylinder behaviour in the form of pressure-crank angle (p – θ) diagram to assess the thermodynamic behaviour of the engine. Three-dimensional (3-D) simulation of the flow field in the combustion chamber (involving piston-bowl arrangement) through the cycle up to the start of the combustion is used to obtain inputs on the turbulence intensity (u′) and length scale (lT) for the modelling of the flame propagation process in a zero-dimensional model (0-D) designed to predict the p – θ curve. The flame propagation and heat release processes make use of eddy entrainment and laminar burn-up model. The data on u′ extracted from the 3-D flow calculations match reasonably well with experiments till compression stroke but are in contradiction with trends close to TC. This is reasoned to be due to limitation of the k-ε model to capture transient effects due to reverse squish phenomenon. The 0-D model took into account the experimental behaviour of the u′ in the post-TC period to attempt to match the observed p – θ data over a range of CRs and ignition timing advances. While these predictions match well with the experimental data at advanced ignition timing at both higher and lower CRs, the peak pressure is under-predicted at lower ignition advances; reason are traced to increase in flame area and propagation speed due to reverse squish effect. When these are accounted in the model, the p – θ curves are predicted better.

scholarly journals A Limit on Line Emission in the X-Ray Background at High Galactic Latitudes

1971 ◽  
Vol 167 ◽  
pp. L1 ◽  
Author(s):  
E. A. Boldt ◽  
U. D. Desai ◽  
S. S. Holt ◽  
P. J. Serlemitsos
Keyword(s):  
Line Emission ◽  
X Ray ◽  
On Line ◽  
X Ray Background

Lattice Location and Cathodoluminescence Studies of Ytterbium/Thulium Implanted 2H-Aluminium Nitride

2002 ◽  
Vol 743 ◽  
Author(s):  
U. Vetter ◽  
M. F. Reid ◽  
H. Hofsäss ◽  
C. Ronning ◽  
J. Zenneck ◽  
...  
Keyword(s):  
Room Temperature ◽  
Lattice Site ◽  
Electron Transition ◽  
Lattice Location ◽  
Temperature Dependent ◽  
Time Resolved ◽  
Annealing Temperatures ◽  
Visible Luminescence ◽  
On Line ◽  
Emission Channeling

ABSTRACTLattice location studies of radioactive 169Yb ions, implanted at an energy of 60 keV into 2H-AlN at the on-line isotope separator ISOLDE at CERN, were performed using the emission channeling technique. The measurements, which yield a substitutional Al lattice site for the implanted ions, were recorded for annealing temperatures ranging from 293 K to 1273 K. After complete decay of 169Yb to 169Tm cathodoluminescence measurements were performed in the range 12 K – 300 K. The samples show a strong visible luminescence at 460 - 470 nm at room temperature, which is attributed to the 1D2−3F4 intra-4f electron transition of Tm3+. At 12 K the luminescence is dominated by transitions starting from the 1H6 multiplet. Time resolved as well as temperature dependent cathodoluminescence measurements are presented and discussed.The lattice location as well as the time resolved cathodoluminescence measurements suggest that there is only one pronounced site of the implanted ions in the AlN lattice and that this is the substitutional aluminium site.

A NOVEL APPROACH TO SHARE ON-LINE EMISSION CONTROL DATA

2000 ◽  
Vol 2000 (3) ◽  
pp. 996-1006
Author(s):  
Michael W. Heitz ◽  
Mark J. Steinmetz
Keyword(s):  
Emission Control ◽  
Line Emission ◽  
Control Data ◽  
Novel Approach ◽  
On Line

Lanthanide Doped Cubic Boron Nitride

2002 ◽  
Vol 744 ◽  
Author(s):  
U. Vetter ◽  
T. Taniguchi ◽  
U. Wahl ◽  
J. Correia ◽  
A. Müller ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Electron Emission ◽  
Cubic Boron Nitride ◽  
Isotope Separator ◽  
Electron Transitions ◽  
Strong Luminescence ◽  
On Line ◽  
Direct Lattice ◽  
Emission Channeling ◽  
The Eu

ABSTRACTFirst basic investigations on lanthanide implanted cubic boron nitride were performed with focus on the site of the implanted ions as well as their luminescence behaviour. In order to investigate the lattice sites of lanthanides in c-BN, we implanted single crystal c-BN with radioactive 139Ce ions using the on-line isotope separator ISOLDE at CERN. After the samples were annealed at 1193 K, direct lattice location studies were performed using the conversion electron emission channeling technique and showed a near-substitutional fraction of the implanted ions of at least 10 %. Additionally, poly crystalline c-BN samples were implanted with stable Eu and Tm ions in order to investigate the luminescence properties of triply ionised lanthanides in the c-BN host. It is found that the annealing of the implanted samples at high temperature and high pressure results in strong luminescence of the Eu3+ ions in the orange and moderate luminescence of the Tm3+ ions in the blue. In case of the Eu implanted samples, the luminescence is assigned to the 5D0-7FJ intra-4f electron transitions of Eu3+, in case of the Tm implanted samples, detectable transitions are 1D2-3H6, 1D2-3F4, 1G4-3H6. of Tm3+.

Limit on Line Emission in the Diffuse X-Ray Background.

1972 ◽  
Vol 172 ◽  
pp. L73 ◽  
Author(s):  
A. Toor ◽  
R. E. Price ◽  
F. D. Seward
Keyword(s):  
Line Emission ◽  
X Ray ◽  
On Line ◽  
X Ray Background

On-line emission and economic load dispatch using adaptive Hopfield neural network

2003 ◽  
Vol 2 (4) ◽  
pp. 297-305 ◽  
Author(s):  
S. Balakrishnan ◽  
P.S. Kannan ◽  
C. Aravindan ◽  
P. Subathra
Keyword(s):  
Neural Network ◽  
Line Emission ◽  
Hopfield Neural Network ◽  
Economic Load Dispatch ◽  
On Line
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