five cases of giant cell tumor of the lower end of radius are reported. three of the patients were women and two were men, the youngest of the patients was 18 years old and oldest 37 years. en bloc resection followed by reconstructive procedures were performed in three of the cases with good results.

Due to machining techniques and dust deposition, gas turbine upstream slots vane roots are always filleted, significantly affecting the cooling performance of endwall. The effects slot fillet root on endwall were investigated by solving three-dimensional Reynolds-averaged Navier–Stokes (RANS) equations with shear stress transport (SST) k–ω turbulence model. results indicate that velocity distri...

Deployment of femtocells represents a promising solution to increase cost-capacity benefits for network operators and provide higher data rates to end-users. Femtocells are conceived to provide indoor wireless access to a cellular network through a Home Base Station, which is connected via internet to the operator’s core network, helping to improve coverage in indoors, offload the macrocell and...

In this paper, we deal with connectivity and coverage problem in Wireless Mesh Networks (WMNs). We used Friedman test to compare Genetic Algorithm (GA), Tabu Search (TS), Hill Climbing (HC) and Simulated Annealing (SA). We found out that GA, TS, HC and SA have differences in their performance. Then, we used the implemented systems WMN-GA, WMN-TS, WMN-HC and WMN-SA to evaluate and compare the pe...

One major problem in the area of Wireless Sensor Networks (WSNs) is the topology control. Topology control protocols in WSNs construct an optimized network topology structure to satisfy the application requirements, such as network connectivity and coverage. In this paper, we deal with the topology control problem by adjusting the transition radius of the sensor nodes. We produce a cluster-base...

Sensor networks are ubiquitously used for detection and tracking and as a result covering is one of the main tasks of such networks. We study the problem of maximizing the coverage lifetime of a barrier by mobile sensors with limited battery powers, where the coverage lifetime is the time until there is a breakdown in coverage due to the death of a sensor. Sensors are first deployed and then co...

One of the primary issues for any Wireless Sensor Network deployment is that of longevity of the network. The life span of the network must be maximized but the quality of the sensory data received from the network must not be compromised to any great extent. Current solutions to achieving this require the definition of a sensing radius for each sensor and a coverage level k. The sensed area is...

In similar with terrestrial and satellite wireless networks, a new alternative based on platforms located in the stratosphere has recently introduced, known as High Altitude Platforms (HAPS). HAPS are either airships or aircraft positioned between 17 and 22.5 km above the earth surface. It has capability to deliver a wide spectrum of applications to both mobile and fixed users over a broad cove...

This paper has two agendas. Firstly, we exhibit new results for coverage processes. Let p(n,m,α) be the probability that n spherical caps of angular radius α in S do not cover the whole sphere S. We give an exact formula for p(n,m,α) in the case α ∈ [π/2, π] and an upper bound for p(n,m,α) in the case α ∈ [0, π/2], which tends to p(n,m, π/2) when α → π/2. In the case α ∈ [0, π/2] this yields up...