The likelihood of line-of-sight (LoS) is an essential component in any radio channel model. It is particularly useful for radio network planning and urban coverage prediction. Empirical LoS models are hard to derive due to a strong dependency on local topology and the need for large measurement datasets. Since buildings are the major obstructions in a dense urban environment, we propose a new t...

When logs of three 4iaineter classes and two specific gravity classes were sheared with a 3/8-inch-thick knife travelling at 2 inches per minute, shearing force and work averaged greatest for dense 13.6-inch logs cut with a knife having a 45" sharpness angle (73,517 pounds; 49,838 footpounds). Force and work averaged least for 5.1-inch bolts of low density when cut with a knife having 22-1/2" s...

Aim. To evaluate the effects of fixture design and surface on the early bone formation around immediately loaded implants inserted in the human posterior maxilla. Materials and Methods. Ten totally edentulous subjects received two transitional implants: one tapered implant with knife-edge threads/nanostructured calcium-incorporated surface (test: Anyridge®, Megagen, Gyeongbuk, South Korea) and ...

An approximately 3 ram. wide strip of thin adhesive plaster is attached to one jaw of a pair of standard, fiat glass pliers in a manner shown in Fig. 1. The marked line is placed on the side opposite to the strip (Fig. 2) and the pliers closed over it with a steadily progressing pressure. The thickness of the adhesive acts as a wedge against the glass mark and effects a slow and clean break. Th...

PURPOSE To evaluate the dimensional accuracy of several impression methods including agar alginate combined impression in vivo; the marginal accuracy of stone dies was determined using a new electroformed master crown technique. MATERIALS AND METHODS Cast cores with knife-edge and chamfer margins and electroformed master crowns were fabricated for 3 patients. Five impressions were taken of ea...

PURPOSE The aim of this study was to compare the precision of optical impression (Trios, 3Shape) versus that of conventional impression (Imprint IV, 3M-ESPE) with three different margins (shoulder, chamfer, and knife-edge) on Frasaco teeth. MATERIALS AND METHODS The sample comprised of 60 zirconia half-crowns, divided into six groups according to the type of impression and margin. Scanning el...

Concerning the problem of the low cutting quality and the bevel edge in the piece of lotus root, the reason was analyzed and the method of improvement was to reduce the force in the vertical direction of link to knife. 3D parts and assemblies of cutting mechanism in slicing machine of lotus root were created under Pro/E circumstance. Based on virtual prototype technology, the kinematics and dyn...

In order to explore the laws of corn straw lateral moving and throwing, it is necessary identify main factors that restrict improvements in quality clearing reductions power consumption then optimize knife parameter combinations; this paper, kinematic analysis single-stage throwing was carried out, mathematical model for collision process between established. Key affecting efficiency were deter...