The following statement on the plan to use Queen Mary's Hospital, Carshalton, Surrey, for children who are mentally handicapped as well as those suffering from physical illness, has been sent to us for publication. We are glad to give it publicity and to assure members of the Hospital Management Committee that the N.A.M.H. will watch future developments with deep interest.?Ed. The Minister of H...

Fountain House has passed through various developmental stages. It has adopted the ideology of a club-house from Fountain House, New York, along with a number of innovative programmes for the rehabilitation of the mentally ill. Through a process of constant experimentation and evaluation, it has evolved a programme and an ideological framework which is in keeping with the religious and cultural...

The behaviour of a turbulent, axisymmetric, Boussinesq, vertical fountain that impinges on a horizontal plate a distance H from the fountain source is investigated. Images from Light Induced Fluorescence visualisation of the flow provide a clear picture of the internal structure of the impinging flow. The interaction between the impinging fountain and the plate results in a buoyant radial wall ...

A cesium fountain clock is operated utilizing a microwave oscillator that derives its frequency stability from a stable laser by means of a fiber-laser femtosecond frequency comb. This oscillator is based on the technology developed for optical clocks and replaces the quartz-based microwave oscillator commonly used in fountain clocks. As a result, a significant decrease in the frequency instabi...

A Digital Fountain is an approach used to provide reliability in multicast networks without the use of receiver initiated packet retransmissions. Prior work to Digital Fountain has shown that use of receiver initiated retransmissions to recover lost data is unscalable in multicast networks and the impact is significant in lossy networks. Instead, like many other techniques that transmit redunda...

NIST is currently investigating the design of a second-generation cesium-fountain primary frequency standard. The design goals of this standard include an ultimate frequency inaccuracy of δf/f < 10 and achievable stability better than σy(τ) < 10/τ. This standard is expected to eventually replace NIST-F1, the current U.S. primary frequency standard [1]. In the context of reaching frequency uncer...

Fountain codes are record-breaking sparse-graph codes for channels with erasures, such as the internet, where files are transmitted in multiple small packets, each of which is either received without error or not received. Standard file transfer protocols simply chop a file up into K packetsized pieces, then repeatedly transmit each packet until it is successfully received. A back channel is re...

The uncertainty evaluation of CSF2, the second caesium fountain primary frequency standard at PTB, is presented. The fountain uses optical molasses to cool atoms down to 0.6μK. The atoms are launched vertically in a moving optical molasses, and state-selected in the |F = 3,mF = 0〉 hyperfine ground state. During their ballistic flight, the atoms interact twice with a microwave field, thus comple...

A novel concept of joint source-fountain coding for asynchronous wireless broadcast is presented. The traditional field of joint source-channel coding aims in both lossless data compression as well as reliable data delivery. Besides, fountain coding allows reliable broadcast without the need of feedback, and furthermore, asynchronous data access, i.e., each receiver is able to decide when it wa...