Archive for the 'Engineering' Category

Topology Dynamics in a P2PTV Network

Abstract. In recent years, a number of commercial peer-to-peer TV (P2PTV) applications have been launched. Yet, their mechanisms and characteristics are unknown. In this paper, we study SopCast, a typical proprietary P2PTV system. Treating SopCast as a black box, we perform a set of experiments that are suitable to analyze SopCast in depth. We attempt to disclose the SopCast protocol. The dynamic nature of the SopCast overlay, in terms of node degree, is also addressed in this paper. Our approaches in analyzing the SopCast mechanism and characterizing its topological properties reveal important design insights in SopCast, and may help to better understand similar P2PTV systems.

Introduction

A rapid assessment of the impacts of the Montara oil leak on birds, cetaceans and marine reptiles

EXECUTIVE SUMMARY

  • On 24th September 2009, Dr James Watson of the University of Queensland was commissioned by the Department of the Environment, Water, Heritage and the Arts (DEWHA) to lead a rapid survey of the ‘megafauna’ (defined as cetaceans, birds and marine reptiles, i.e. turtles and sea snakes) in the Montara oil spill region. He solicited the help of Dr Liana Joseph (University of Queensland) and Dr Alexander Watson to conduct these tasks.
  • The rapid survey, conducted on board the boat Sea Sprint, departed Darwin in the evening of Friday 25th September and returned the morning of Sunday 4th October.
  • Five days of transects (incorporating 279 10-minute strip transects) were conducted at sea, covering a distance of 668.5 nautical miles (1,238 km) and a total survey area of 99,040 ha. In these surveys, a total of 124 (44%) 10-minute strip transects were in waters that were visibly affected by oil.

A HDMI design guide for successful high-speed PCB design

Controlled Impedance Transmission Lines

Controlled impedance traces are used to match the differential impedance of the transmission medium, e.g., cables, and the termination resistors. Differential impedance is determined by the physical geometries of the signal pair traces, their relation to the adjacent ground plane and the PCB dielectric. These geometries must be maintained across the
entire trace length.

Figure 5 depicts the parameters relevant for impedance calculation for both, Microstrip traces (outer layer traces), and stripline traces (traces within the layer stack, typically sandwiched by two ground planes).

To calculate the trace geometries in Figure 5 for a 100 differential impedance TMDS signal pair, the closed-form equations 1 ” 6 can be applied.

  1. For loosely coupled striplines, s > 12 mils, the number 0.748 might be replaced with 0.374
  2. For W < 2h the maximum error is 3%

Bondstrand M80 Pipe Shaver Guide

Introduction

The M80 pipe shaver is designed to prepare Quick-Lock spigot ends on Bondstrand pipe as described in the Bondstrand Assembly Instructions, FP170. Pipe is shipped from the factory with prepared spigot ends, but pipe cut to length on the jobsite must be provided with a new spigot end before assembly. Spigot ends can be prepared on 10 through 16-inch pipe of any Bondstrand series with the Quick-Lock joint using the M80 tool. The M80 tool can also be used to shave 8-inch Quick-Lock spigots and is to be preferred to the B-1 tool when preparing 8-inch Bondstrand Series 2000M and 7000M marine pipe that have greater wall thicknesses than Bondstrand industrial pipe.

Snap and Grow Greenhouse Guide

Care & Maintenance

When your greenhouse needs to be cleaned, use a mild detergent solution and rinse with cold clean water. DO NOT use acetone, abrasive cleaners or other special detergents to clean the clear panels.

For replacement parts – call our service line. For additional information please visit our web site: www.palram.com

Tools & Equipment

  • Tape measure
  • Work gloves
  • Plastic or rubber mallet
  • Phillipshead screwdriver
  • Step ladder
  • Scissors
  • Spirit level – For base alignment
  • Cloth
  • Sort the parts and check against the contents parts list.
  • Carry out the assembly steps in the order set out in the instructions.
  • The front of the greenhouse is the wall including the door, and the back is the opposite wall.
  • After assembly fit the greenhouse to the base using connectors no. 35 and fit the whole unit to a leveled final position.

KIPOR Inverter Generator Troubleshooting Guide

Fuel Leak
For the 3000/3500Ti, it could be the valve or it could be the tank leaking between the brass fitting and the plastic tank. Both are replaceable. Determine which is leaking and either part is replaceable.

Fuel Flow
Open the drain screw on the bottom of the carburetor, do you get a steady flow of fuel? If so, there is no blockage. If no fuel flow, blockage may be the case. It is possible that you have a partial blockage which allows fuel to flow to the carb, giving the appearance of a steady supply, when in fact it is there but is not enough to meet the demand of the engine. Check for kinks in the fuel line.