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7 results for "specific aperture"
Channel Characterisation and System Design for Sub-Surface Communications By David Gibson
eBook (PDF): $54.62
Based on the author's PhD thesis, this book is a theoretical study of subterranean radio communication, with the focus on methods that depend primarily on the penetration of electromagnetic fields... More > through the ground. Through-the-earth communication using e-m fields - specifically magnetic induction - plays a role in search and rescue systems used in the mining industry. It is also used for borehole telemetry, pipeline location and by cavers and pot-holers. Chapters describe propagation, antennas, and the design of transmitters and receivers. A figure of merit - the specific aperture - is introduced as an aid to antenna design. A crucial aspect of all systems is the signal to noise ratio, for which the strategy of noise-matching is introduced. The design of a wide-band low-frequency sounder is described, for channel evaluation using a non-ideal binary sequence. A method of calculating the inverse of a generalised sequence is described, for which cross-correlation results in a system identification signal.< Less
Channel Characterisation and System Design for Sub-Surface Communications By David Gibson
Paperback: List Price: $308.09 $77.02 | You Save: 75%
Prints in 3-5 business days
Based on the author's PhD thesis, this book is a theoretical study of subterranean radio communication, with the focus on methods that depend primarily on the penetration of electromagnetic fields... More > through the ground. Through-the-earth communication using e-m fields - specifically magnetic induction - plays a role in search and rescue systems used in the mining industry. It is also used for borehole telemetry, pipeline location and by cavers and pot-holers. Chapters describe propagation, antennas, and the design of transmitters and receivers. A figure of merit - the specific aperture - is introduced as an aid to antenna design. A crucial aspect of all systems is the signal to noise ratio, for which the strategy of noise-matching is introduced. The design of a wide-band low-frequency sounder is described, for channel evaluation using a non-ideal binary sequence. A method of calculating the inverse of a generalised sequence is described, for which cross-correlation results in a system identification signal.< Less
Travel Photography Tips for the Smartphone Photographer By Christelle van Tonder
eBook (PDF): $7.00
This eBook will teach you: - What smartphone photography gear to pack - Specific apps that will make life easier - Approaching locals to take photos - An introduction to shutter speed and aperture -... More > Composition rules, and much much more.< Less
5-Axis Porting (black & white) By 3D Systems - GibbsCAM
Paperback: $13.95
Prints in 3-5 business days
This manual discusses the use and interface of the GibbsCAM 5-Axis Porting option. The Porting module presents a special-purpose interface specifically to create 5-axis toolpath for port-type... More > geometries, such as conduits (“tunnels”) that connect apertures of different shapes to one another, blending/morphing from one shape to another. Recommended prior reading: Mill; Getting Started; and either 2.5D Solids or SolidSurfacer. Release Date: January 2014, for GibbsCAM 2015, v11.0< Less
5-Axis Porting (color) By 3D Systems | GibbsCAM
Paperback: $19.95
Prints in 3-5 business days
This manual discusses the use and interface of the GibbsCAM 5-Axis Porting option. The Porting module presents a special-purpose interface specifically to create 5-axis toolpath for port-type... More > geometries, such as conduits (“tunnels”) that connect apertures of different shapes to one another, blending/morphing from one shape to another. Recommended prior reading: Mill; Getting Started; and either 2.5D Solids or SolidSurfacer. Release Date: January 2014, for GibbsCAM 2015, v11.0< Less
5-Axis-MultiBlade (colori) By 3D Systems | GibbsCAM
Paperback: $18.95
Prints in 3-5 business days
This manual discusses the use and interface of the GibbsCAM 5-Axis Porting option. The Porting module presents a special-purpose interface specifically to create 5-axis toolpath for port-type... More > geometries, such as conduits (“tunnels”) that connect apertures of different shapes to one another, blending/morphing from one shape to another. Recommended prior reading: Mill; Getting Started; and either 2.5D Solids or SolidSurfacer. Release Date: January 2015, for GibbsCAM 2015, v11.0< Less
5-Axis-MultiBlade (bianco & nero) By 3D Systems | GibbsCAM
Paperback: $9.95
Prints in 3-5 business days
This manual discusses the use and interface of the GibbsCAM 5-Axis Porting option. The Porting module presents a special-purpose interface specifically to create 5-axis toolpath for port-type... More > geometries, such as conduits (“tunnels”) that connect apertures of different shapes to one another, blending/morphing from one shape to another. Recommended prior reading: Mill; Getting Started; and either 2.5D Solids or SolidSurfacer. Release Date: January 2015, for GibbsCAM 2015, v11.0< Less

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