The name-to-value bindings may also be secured, allowing handles to be used in trust management applications. Each handle may have its own administrator(s) and administration can be done in a distributed environment. These associated values can be changed as needed to reflect the current state of the identified resource without changing the handle, thus allowing the name of the item to persist over changes of location and other current state information. The protocols enable a distributed computer system to store names, or handles, of digital resources and resolve those handles into the information necessary to locate, access, and otherwise make use of the resources. The Handle System includes an open set of protocols, a namespace, and a reference implementation of the protocols. The Handle System® is a general purpose distributed information system designed to provide an efficient, extensible, and secured global name service for use on networks such as the Internet. This talk will provide a brief history and technical overview and identify issues in its use in the digital library and electronic publishing arenas. It was designed by CNRI as a general purpose global system for the reliable management of information on networks such as the Internet over long periods of time and is currently in use in a number of production and prototype projects. Joint Meeting with: National Libraries: WorkshopĬorporation for National Research InitiativesĮ-mail: The Handle System is a distributed computer system which stores names, or handles, of digital items and which can quickly resolve those names into the information necessary to locate and access the items.
INDIRECTION IN FROZEN PROFESSIONAL
Professional Group: Information Technology
INDIRECTION IN FROZEN ARCHIVE
This old website and all of its content will stay on as archive – Ĭonference Jerusalem, Israel, 13-18 August The lower immersion heater heats the whole cylinder on the cheaper night tariff, and the top one keeps the water up to temperature as it is drawn off throughout the day.As of 22 April 2009 this website is 'frozen' in time - see the current IFLA websites These tariffs offer 7 hours of cheaper electricity at night. Direct cylinders go hand in hand with Economy 7 electricity tariffs. Instead, the water is heated directly by two immersion heaters. In a direct cylinder, there is no heat exchanger. Depending on it will have a big impact on your energy bills. However, this should only be used as a temporary measure. This means that household still won’t be without hot water even if the boiler isn’t working. Most indirect cylinders are still fitted with an immersion heater. This is known as priming the cylinder – hence the name.
The air lock forms while the cylinder fills with water. The two bodies of water are separated by an air lock inside the heat exchanger. In plumbing systems with a primatic hot water cylinder, the cold storage cistern supplies the water for both the cylinder and the central heating. However, the heat exchanger is not always a coil. (If they do, this is the result of a broken coil.) The two bodies of water – the water from the boiler and the domestic hot water – never mix. This heats the rest of the water in the cylinder. When requested by the thermostat, hot water from the boiler is pumped through the coil. A thermostat is strapped to the side of the cylinder. In a household with a cold water storage cistern and a feed and expansion cistern in the loft, and a regular gas or oil boiler, the hot water cylinder contains a coil of copper pipe, which functions as a heat exchanger.
Fix a blocked or frozen condensate pipe.Radiator cold at the bottom, hot at the top.
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