This paper considers a class of overlay cognitive radios with three messages, referred to as overlay cognitive MAC radios. The system consists of two transmitters and receivers but three independent messages, two of w...
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ISBN:
(纸本)9781457705953
This paper considers a class of overlay cognitive radios with three messages, referred to as overlay cognitive MAC radios. The system consists of two transmitters and receivers but three independent messages, two of which are to be decoded at one receiver while the third is destined for the other receiver. An achievable region and an outer bound for the "weak" and "strong" interference cases are presented for this channel, which are ultimately shown to match for the special class of "weak" Gaussian overlay cognitive MAC radios.
A novel in situ sample cleavage technique has been developed for fabricating specimens for cross-sectional scanning tunneling microscopy (XSTM) applications. This technique can be easily adapted to any ultrahigh vacuu...
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ISBN:
(纸本)1558993029
A novel in situ sample cleavage technique has been developed for fabricating specimens for cross-sectional scanning tunneling microscopy (XSTM) applications. This technique can be easily adapted to any ultrahigh vacuum (UHV) STM that has a coarse motion capability. A conducting diamond STM tip is used to create micron long scratches on Ge/GaAs or GaAs {001}-type surfaces. These {001} surfaces are imaged with STM to observe scratch characteristics, and GaAs samples are cleaved to reveal {110}-type faces. Atomic resolution images of {110}-type GaAs surfaces are readily and reproducibly obtained.
Numerical modelling has the potential to probe the complexity of the interacting physics of rubble mound armour systems. Through forward modelling of armour unit packs, stochastic variables such as unit displacement a...
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ISBN:
(纸本)9780989661126
Numerical modelling has the potential to probe the complexity of the interacting physics of rubble mound armour systems. Through forward modelling of armour unit packs, stochastic variables such as unit displacement and maximum contact force per unit during an external oscillatory disturbance can be predicted. The combined finite-discrete element method (FEMDEM) is a multi-body method ideally suited to model the behaviour of the armour layer system and the stresses generated within complex shape units. In this paper we highlight the latest developments made with the application of FEMDEM technology to breakwater modelling including realistic rock underlayer and concrete unit layer topologies, maximum contact force distributions, internal unit stresses, fracture and unit breakages. Finally, fully coupled wave and multi-body armour unit motion with internal dynamic stress generation is illustrated.
Silicon-On-Insulator (SO) technology is a suitable choice to realize monolithic radiation imaging device as it involves a separate thick silicon layer in addition to a circuit layer. However, there are several issues ...
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ISBN:
(纸本)9781538635599
Silicon-On-Insulator (SO) technology is a suitable choice to realize monolithic radiation imaging device as it involves a separate thick silicon layer in addition to a circuit layer. However, there are several issues to overcome for using radiation sensors and CMOS LSI circuits on a same die, i.e., the back-gate effect, coupling between sensors and circuits, and the total ionization dose (TID) effect. These issues have been solved by introducing a middle Si layer between the sensor and circuit layer (double SOI). The back-gate effect and the coupling are successfully suppressed and radiation hardness is increased by more than 100 kGy(Si) by introducing bias in the middle Si layer. In addition, a small pixel size is achieved by using the PMOS and NMOS active merge technique in SO. This enables a much smaller layout size than that in the bulk CMOS process with the same feature size, while maintaining a high enough analog operation voltage. An example of a counting-type detector is also shown.
In recent work, ultrafiltration has been used to separate solutes from spent pulping liquors into fractions by molecular weight. Experimental results showed that separation efficiency is independent of solute molecula...
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In recent work, ultrafiltration has been used to separate solutes from spent pulping liquors into fractions by molecular weight. Experimental results showed that separation efficiency is independent of solute molecular weight distribution in the feed stream and of concentration for the solutions ultrafiltered. The objective of this paper is to examine how membrane characteristics and the molecular size versus molecular weight distribution affect the separation performance of ultrafiltration membranes.
The increasing penetration of distributed generation (DG) could cause positive and adverse impacts on distribution power grids. The study of these effects could lead to methodological guidelines for sizing and locatio...
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ISBN:
(纸本)9781509042371
The increasing penetration of distributed generation (DG) could cause positive and adverse impacts on distribution power grids. The study of these effects could lead to methodological guidelines for sizing and location of renewable energy sources. In this paper several simulations of a distibution system of MV with different locations and penetration levels of DG are performed. Performance parameters as transmission capacity and voltage level are calculated and the impact of the different penetration scenarios is assessed. Finally a relationship among benefits, the Hosting Capacity (HC), and the distance between feeder-head and DG location is characterized. A new index is proposed to value the better location of units and generation power based on this relationship.
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