An adsorption-desorption (or parking-lot) model can reproduce qualitatively the densification kinetics and other features of a weakly vibrated granular material. Here we study the the two-time correlation and response functions of the model and demonstrate that their behavior is consistent with recently observed memory effects in granular materials. Although the densification kinetics and hyste...

Open-celled titanium foams were fabricated by vacuum hot pressing of a blend of Ti and NaCl powders followed by NaCl removal in water. Densification kinetics of the Ti/NaCl blends are measured at 780 ◦C at various pressures (30–50MPa), NaCl volume fractions (30–70%) and NaCl powder sizes (50–500 m). As compared to pure Ti powders, densification kinetics of the blends is faster for relative dens...

The major challenges in 5G wireless communication systems are the very high data rate, very low latency, very high mobility, very high density of users, very low energy cost and massive number of devices which cannot be addressed by the existing 4G-LTE, LTE-A. In this paper, heterogeneous networks architecture is proposed for the prospects of 5G wireless communications systems networks to addre...

Massive multiple-input multiple-output (MIMO) systems are strong candidates for future fifth-generation (5G) heterogeneous cellular networks. For 5G, a network densification with a high number of different classes of users and data service requirements is expected. Such a large number of connected devices needs to be separated in order to allow the detection of the transmitted signals according...

Abstract The main goal of this study is optimization of densification of ZrB2-SiC composites reinforced with chopped Cf prepared by SPS. Taguchi method is employed as statistical design of experiment (DOE) to optimize densification parameters including SiC, Cf, MoSi2, HfB2 and ZrC content, milling time of Cf and SPS parameters such as temperature, time and pressure. Each of these factors ...

Urban densification and preservation of soil are a much discussed topics on which there is still little detailed research. In Switzerland these concepts are also acknowledged by visions and regulations at the federal level together with the importance of increasing energy supply by renewable energy sources and reducing the energy demand in-primis of existing building. The scientific community i...

Abstract The aim of this paper is to present the results from GNSS-based densification International Terrestrial Reference Frame (ITRF) in region Cyprus. regional network used for task consists nine permanent GNSS Cypriot stations (eight existing CYPOS plus NICO station which belongs global IGS network) and 34 additional EUREF Permanent Network (EPN) are mostly located continental part Europe. ...

[1] Greater understanding of variations in firn densification is needed to distinguish between dynamic and melt-driven elevation changes on the Greenland ice sheet. This is especially true in Greenland’s percolation zone, where firn density profiles are poorly documented because few ice cores are extracted in regions with surface melt. We used georadar to investigate firn density variations wit...

Various procedures of mixing starting powders for hot-pressing α-SiAlON ceramics were studied. They included different milling methods (attrition milling, ball milling, and sonication), liquid medium (water, isopropyl alcohol, and pyridine), and atmospheres (ambient air and nitrogen). These mixing procedures resulted in markedly different densification behavior and fired ceramics. As the powder...