Controlling thermal transport has become relevant in recent years. Traditionally, this control been achieved by tuning the scattering of phonons including various types centres material (nanoparticles, impurities, etc). Here we take another approach and demonstrate that one can also use coherent band structure effects to phonon conductance, with help periodically nanostructured phononic crystals. We perform experiments at low temperatures below 1 K, which not only leads negligible bulk...

The impact of antenna downtilt on the performance cellular WCDMA network has been studied by using a radio planning tool. An optimum angle evaluated for numerous practical macrocellular site and configurations electrical mechanical concepts. aim this massive simulation campaign was expected to provide an answer two questions: firstly, how select base station antenna? Secondly, what is system capacity coverage? Optimum angles were observed vary between – depending configuration. Moreover,...

Network densification has been identified as one key enabling technology to address the 1000x mobile data challenge. This article analyzes network from different deployment options perspective by looking into three mainstream technologies; Macrocells, Microcells, and Femtocells. The technologies are evaluated in a suburban neighborhood with modern residential houses. As majority of traffic is believed be generated indoor users, we make techno-economic analysis comparison strategies local...

The target of the paper is to study performance HSDPA in indoor environment, and provide guidelines for coverage capacity planning antenna configurations selection. Field measurements with a data card, field measurement software, fully functional enabled UMTS network were performed. Indoor corridor environment was used impact different distributed on performance. In addition, pico cell configuration compared corresponding configuration, effect limitations studied. results show, that ensuring...

This paper aims to show the effect of macrocellular network densification on capacity, energy and cost efficiency.The presented results are based radio propagation simulations that consider with different inter-site distances, i.e. site densities, also take into account presence indoor receiver points by varying outdoor distribution.It is observed as a result densifying network, cell spectral efficiency reduces due increasing level inter-cell interference.However, densification, area...

Abstract Ion beam shaping is a novel and powerful tool to engineer nanocomposites with effective three-dimensional (3D) architectures. In particular, this technique offers the possibility precisely control size, shape 3D orientation of metallic nanoparticles at nanometer scale while keeping particle volume constant. Here, we use swift heavy ions xenon for irradiation in order successfully fabricate consisting anisotropic gold nanoparticle that are oriented embedded silica matrix....

The target of the paper is to provide guidelines for indoor planning and optimization using an outdoor-to-indoor repeater or a dedicated system. provides practical information enhancing performance high-speed downlink packet access (HSDPA) in environment. capabilities analog WCDMA are set against system and, furthermore, compared coverage nearby macrocellular base station. An extensive measurement campaign with varying configurations was arranged different environments. results show that...

The aim of this paper is to assess the applicability a repeater connected distributed antenna system for improving indoor capacity in UMTS radio network. A guarantee sufficient coverage and in-building areas constitutes considerable issue topology planning, because both links, users produce high interference outdoor network due significant propagation losses. Presented configuration exploits effectively that amplifies signal from delivers it locations through system. Implementation analyzed...

The target of this paper is to evaluate the impact geographical traffic load distribution optimum downtilt angle macrocellular WCDMA network. Moreover, aim solve feasibility usage fast rate RET and its possible capacity gain with respect load. simulation results have revealed how allowed range angles varies between 6 ◦ 14 depending on whether concentrated closer cell edge or base station. However, particular network configuration, 8 would provide almost maximum uplink downlink capacities all...

We demonstrate a method to fabricate narrow, down few micron wide metallic leads on top of three-dimensional (3D) colloidal crystal self-assembled from polystyrene (PS) nanospheres diameter 260 nm, using electron-beam lithography. This fabrication is not straightforward due the fact that PS cannot usually survive harsh chemical treatments required in development and lift-off steps solve this problem by increasing resistance an additional irradiation step, which allows spheres retain their...

This paper discusses the use of high altitude platforms, HAPs, to provide mobile communication services on-ground customers. The explains behavior UMTS radio network in a situation, where service is being provided by HAP and terrestrial base stations disaster scenario. In scenario, set adjacent cellular middle have been disabled. A station has launched location service. possible effects between are assessed from system point view analyzing simulation results interface. show that able improve...

This paper discusses essential implementation aspects of simple amplify-and-forward type repeaters from the radio network planning point view. Different RF-repeater configurations are assessed through numerical analysis and field measurements in WCDMA network. The target this is to show important factors regarding repeater deployment, which have significant impact on overall cellular efficiency. shows donor antenna beam width deployment flexibility. Moreover, optimum BS tilt angle presented...

We have investigated the fabrication and computational modelling of three-dimensional phononic crystals for observation full band gaps thermal phonons at sub-kelvin temperatures. Self-assembled arrays monodisperse polystyrene nano-spheres been fabricated using a vertical deposition technique. Optimal conditions increasing crystal domain size crystalline quality studied. In addition, structure has computed finite element method simple cubic lattice. The dependence on contact area between...

We demonstrate a novel approach for electron-beam lithography (EBL) of periodic nanostructures. This technique can rapidly produce arrays various metallic and etched nanostructures with line pitch dimensions approaching the beam spot size. Our is based on often neglected functionality which inherent in most modern EBL systems. The raster/vector exposure system software exploited to pixel-like spots without need define coordinates each array. Producing large traditional techniques cumbersome...

In this paper macro performance in a co-channel and femto setup is studied. Measurements are performed live Universal Mobile Telecommunication System (UMTS) network. It concluded that interference does not affect downlink (DL) as long the Received Signal Code Power (RSCP) stronger than RSCP. We also conclude escape carrier robust DL management solution. uplink (UL) direction it shown single UE close to cell can potentially cause noise rise of 6 dB surrounding cell. order limit from UEs,...

In this paper we evaluate the capacity performance of a microcellular network deployment in dense urban Manhattan grid environment. Different layouts with varying cell densities per sq. km are investigated, while considering outdoor and as well indoor propagation environments. Three main enhancing techniques, densification, site placement antenna downtilt utilized their effect on spectral efficiency area is assessed. As result for environment can be improved since increases. However, due to...

This paper presents a unique concept of `Spotlight coverage' for outdoor multi-antenna (or DAS) cellular systems. helps in achieving high Signal-to-Interference Ratio (SIR) throughout the cell coverage area by effectively controlling leakage into neighboring cells. Interference and analysis traditional wall mounted street lamp (providing spotlight coverage) have been presented compared. Results show considerable improvement SIR

We demonstrate nonlinear microscopy of oriented nanowires using excitation beams with binary phase modulation. A simple and intuitive optical scheme comprising a spatial light modulator gives us the possibility to control across an incident Hermite-Gaussian beam order (1,0) (HG10 mode). This technique allows gradually vary distribution longitudinal electric fields in focal volume, as demonstrated by second-harmonic generation from vertically-aligned GaAs nanowires. These results open new...

Network optimization is used by operators to maximize return on investment and ensure customer satisfaction with the quality of delivered service. Coverage capacity are most important characteristics any cellular network. In WCDMA networks, pilot signal a cell determine size, hence it can be coverage area cell. Increasing or reducing power increases reduces size respectively balance load among neighboring cells. As networks continue evolve, frequency number tunable parameters continues...

The feasibility of boundary engineering for the improvement bolometric detectors and tunnel junction coolers is investigated. It can be shown, by comparing results suspended bulk coolers, that ballistic phonon transport dominates heat flow at low temperatures in nanostructures. This allows control cooling heating properties through contact engineering. A solution to fabrication issues structural release demonstrated replacing copper with gold as normal metal nanowire. These structures show...