High fidelity phase locked PIV measurements analysing the flow fields surrounding an oscillating piezoelectric fan

  • Donnelly B.
  • Jeffers N.
  • Nolan K.
  • Stafford J.

Piezoelectric fans have been studied extensively and are seen as a promising technology for thermal management due to their ability to provide quiet, reliable cooling with low power consumption. The fluid mechanics of an unconfined piezoelectric fan are complex which is why the majority of the literature to date confines ...

Towards the METIS 5G concept

  • Bulakci Ömer
  • Fertl Peter
  • Gozalvez-Serrano David
  • Höglund Andreas
  • Li Zexian
  • Mange G.
  • Pawlak Krystian
  • Popovski Petar
  • Tullberg Hugo

METIS is developing a 5G system concept that meets the requirements of the beyond-2020 connected information society and supports new usage scenarios. To meet the objectives METIS uses Horizontal Topics (HT) that addresses a key new challenge, identifies necessary new functionalities and proposes HT-specific concepts. This paper presents an initial ...

CHARACTERIZATION OF VALVELESS PIEZOELECTRICALLY- ACTUATED MICROPUMPS WITH NOVEL DIFFUSER ELEMENTS

  • Ehrlich L.
  • Jeffers N.
  • Punch J.
  • Stafford J.

Micropumps can play a significant role in thermal management applications, as a component of microfluidic cooling systems. For next-generation high density Photonics Integrated Circuits (PICs), in particular, heat flux levels are sufficiently high to require a microfluidic circuit for cooling. Valveless piezoelectrically- actuated micropumps are a particularly promising technology to ...

THE DESIGN & CHARACTERIZATION OF A MINIATURE SHAPE MEMORY ALLOY VALVE FOR PASSIVE THERMAL MANAGEMENT

  • Jeffers N.
  • Punch J.
  • Stafford J.
  • Waddell A.

Photonics Integrated Circuits (PICs) are being deployed by the telecommunications industry as transceivers for fibre optic networks. The core component of a typical PIC is the laser-array and the power density of these devices (102 W/cm2 ) now demands novel thermal management architectures including developments such as near-source liquid cooling. ...

HEAT TRANSFER AND FLUID MECHANICS FROM A PIEZOELECTRIC FAN OPERATING IN ITS SECOND RESONANT FREQUENCY MODE

  • Donnelly B.
  • Jeffers N.
  • Stafford J.

Piezoelectric fans are receiving increased interest for thermal management applications because of their reliability, minimal power consumption, and noise-free operation. These features are of particular interest to companies who have strict reliability constraints and have reached the thermal limit of conventionally used natural convection heat sinks. For a classical piezoelectric ...

Geometric structure of segmented flow networks

  • Jeffers N.
  • Stafford J.

Segmented flows consist of two immiscible fluids which travel along a channel in a segmented arrangement due to an imposed pressure difference. In this paper, the geometric structure of segmented flow networks is examined and fundamental design rules are established for two-phase flow without phase change. These rules provide a ...

BENCHMARK NUMERICAL SIMULATIONS OF SOLAR THERMOELECTRIC GENERATORS

  • Enright R.
  • Frizzell R.
  • Lei S.

In this paper, to simplify the design and optimization of thermoelectric generators (TEGs), a three-dimensional numerical model is implemented in a computational finite element simulation environment (COMSOL). The model can take into consideration the Peltier effect, Thomson effect and Seebeck effect inherent to TEGs. In terms of a p-element TEG, ...

Running large scale experimentation on Content-Centric Networking via the Grid’5000 platform

  • Carofiglio G.
  • Gallo M.
  • Muscariello L.

We present a novel tool to set, deploy, run and evaluate large scale experimentation on a novel networking paradigm called content-centric networking.

Filter Optimization for Carrier Frequency and Timing Offsets in Universal Filtered Multi-Carrier System

  • Schaich F.
  • Wang X.
  • Wild T.

Universal Filtered Multi-Carrier (UFMC) is a novel modulation technique which can be seen as a generalization of filtered OFDM and filter bank based multi-carrier (FBMCFMT). Being a candidate waveform technology for 5G wireless systems it combines the simplicity of OFDM with the advantages of FBMC. The FIR-filter, used in UFMC ...

DOCSIS® FOR LTE SMALL CELL BACKHAUL

  • Glapa M.

HFC/DOCSIS access networks are widely used to address the needs of residential and enterprise consumers for High Speed Internet (HSI), video, and voice services. The hot question these days is whether the HFC/DOCSIS networks can support the backhaul needs of LTE small cells? As the characteristics of the cable networks ...

A Choice of Future m2m Access Technologies for Mobile Network Operators

  • Saur S.

It has been predicted that by the early years of the next decade over 20 billion devices will be wirelessly connected in the Internet of Things. Many of these are set to be connected using short-range wireless systems such as Bluetooth LE, WiFi or Zigbee, but, if so, all of ...

Key Countermeasures Against Selective Fading

  • Valtolina R.

As the microwave industry adopts higher modulation schemes, effective countermeasures against selective fading become extremely important. Service providers are already deploying 1024 Quadrature Amplitude Modulation (1024 QAM) systems. And 4096 QAM is on the near horizon. These higher modulation schemes are much more sensitive to selective fading. This article provides ...

Hybrid III-V on Silicon lasers for photonic integrated circuits on Silicon

  • Duan G.

Silicon photonics is attracting large attention due to the promise of fabricating low-cost, compact circuits that integrate photonic and microelectronic elements. It can address a wide range of applications from short distance data communication to long haul optical transmission. Today, practical Si-based light sources are still missing, despite the recent ...

Pilot Contamination Postcoding in Large Scale Antenna Systems

  • Adhikary A.
  • Ashikhmin A.
  • Marzetta T.

This talk is to uplink communication in multi-cell multi-user LSASs (massive MIMO wireless system). We proposed a new approach for a limited cooperation between base stations in the network. We call it pilot contamination postcoding (PCP). Next we developed an algorithm for funding optimal PCP matrices for global PCP. In ...

Universal Filtered Multi-Carrier with Leakage-Based Filter Optimization

  • Santos A.
  • Schaich F.
  • Wang X.
  • Wild T.

Universal Filtered Multi-Carrier (UFMC) is a novel modulation technique which can be seen as a generalization of filtered OFDM and Filterbank based multi-carrier (FBMCFMT). Being a candidate waveform technology for 5G wireless systems it combines the simplicity of OFDM with the advantages of FBMC. While previous work on UFMC was ...

VISUAL STUDY OF FLUID DYNAMICS IN WICKLESS TRANSPARENT HEAT PIPES

  • Kempers R.
  • Robinson A.
  • Siedel S.
  • Smith K.

Heat pipes are generally recognized as a reliable heat transfer device for many different applications however clarity is needed to describe the thermal mechanisms driving the transfer of heat. This experiment involved the construction and testing of a transparent, sapphire heat pipe, with water as the working fluid. Through high ...

Preserving Privacy in Social City Networks via Small Cells

  • Kawsar F.
  • Vanderhulst G.

An increasingly large amount of small cells -- e.g. WiFi hotspots -- is being deployed in residential areas to connect a plethora of smart devices to the Internet. In this paper, we present a social city network leveraging small cells for sharing content geographically and temporarily whilst preserving the privacy ...

VISUAL STUDY OF FLUID DYNAMICS IN WICKLESS TRANSPARENT HEAT PIPES

  • Kempers R.
  • Robinson A.
  • Siedel S.
  • Smith K.

Though heat pipes are recognized as a viable heat transfer device for many different applications, the thermal mechanisms driving the heat transfer are still not fully understood. By fabricating and testing a transparent sapphire heat pipe, with water as the working fluid, the dominant mechanisms of boiling and condensation were ...