Assessment of lithological, geochemical and structural controls on gold distribution in the Nalunaq gold deposit, South Greenland using three-dimensional implicit modelling

2017 ◽  
Vol 453 (1) ◽  
pp. 385-405 ◽  
Author(s):  
Robin-Marie Bell ◽  
Jochen Kolb ◽  
Tod E. Waight
Keyword(s):  
Gold Deposit ◽  
Three Dimensional ◽  
Structural Controls ◽  
Implicit Modelling

Three-dimensional geochemical patterns of regolith over a concealed gold deposit revealed by overburden drilling in desert terrains of northwestern China

2016 ◽  
Vol 164 ◽  
pp. 122-135 ◽  
Author(s):  
Bimin Zhang ◽  
Xueqiu Wang ◽  
Qinghua Chi ◽  
Wensheng Yao ◽  
Hanliang Liu ◽  
...  
Keyword(s):  
Gold Deposit ◽  
Three Dimensional ◽  
Northwestern China

Spatial Characteristics of Acoustic Boundary Control for Interior Noise Suppression

1997 ◽  
Author(s):  
S. M. Hirsch ◽  
J. Q. Sun
Keyword(s):  
Boundary Control ◽  
Structural Control ◽  
Relative Phase ◽  
Noise Suppression ◽  
Three Dimensional ◽  
Interesting Phenomenon ◽  
Spatial Characteristics ◽  
Structural Controls ◽  
Low Dimensionality ◽  
Boundary Controls

Abstract Suppressing interior sound radiation in aircraft and automobiles is a important problem. There are two mainstream methods for this problem: active noise cancellation (ANC) and active structural acoustic controls (ASAC). An ANC system often requires a high dimensionality to achieve the level of global noise reduction in a three dimensional volume that ASAC systems with a relatively low dimensionality are capable of, while actuators for structural control systems are power intensive. There are also concerns that structural controls may cause damages to the structure. This paper develops an acoustic boundary actuation method that may retain the advantages of both methods. Steady-state optimal noise control in a rectangular enclosure is studied by using the proposed method. Simulation results are presented to demonstrate the ability of acoustic boundary controls to cancel noise fields due to various sources. A study of the spatial characteristics of the acoustic boundary control as a function of frequency and relative phase of disturbances is also presented. Numerical simulations uncover an interesting phenomenon on the variation of the optimal control vector which may have significant implications to the actuator grouping studies.

Nature and origin of the BIF-hosted São Bento gold deposit, Quadrilátero Ferrífero, Brazil, with special emphasis on structural controls

2007 ◽  
Vol 32 (3-4) ◽  
pp. 571-595 ◽  
Author(s):  
Sérgio Luiz Martins Pereira ◽  
Lydia Maria Lobato ◽  
Juliano Efigênio Ferreira ◽  
Eduardo César Jardim
Keyword(s):  
Gold Deposit ◽  
Structural Controls ◽  
Quadrilátero Ferrífero

Regional dome evolution and its control on ore-grade distribution: Insights from 3D implicit modelling of the Navachab gold deposit, Namibia

2015 ◽  
Vol 69 ◽  
pp. 268-284 ◽  
Author(s):  
Stefan A. Vollgger ◽  
Alexander R. Cruden ◽  
Laurent Ailleres ◽  
E. Jun Cowan
Keyword(s):  
Gold Deposit ◽  
Grade Distribution ◽  
Implicit Modelling ◽  
Ore Grade
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