colour perception under low-pressure sodium lighting

. This note considers the application of electronic cash to transactions in which many small amounts must be paid to the same payee and in which it is not possible to just pay the total amount afterwards. The most notable example of such a transaction is payment for phone calls. If currently

Actinomycin D blocks DNA-dependent RNA synthesis by binding to DNA (Reich et al., reference 15). On a cellular level, several radioautographic studies have demonstrated the in vivo binding

Viable models of traversable wormholes

that by adjusting the metric coefficients, some of these problems can be corrected. By doing so, the basic idea can be retained: wormholes containing only small amounts of exotic matter can still be traversable. PAC number(s): 04.20.Jb, 04.20.Gz In a recent paper Fewster and Roman [1] discuss wormholes models

Small amounts of m-dinitrobenzene in nitrobenzene can be concentrated by chromatographic adsorption on alumina and elution with a mixture of benzene and light petroleum. The adsorbed wz-dinitrobenzene is extracted with ethanol from the dried extruded alumina column and determined polarographically

In this paper we present two protocols for asynchronous Byzantine Quorum Systems (BQS) built on top of reliable channels---one for self-verifying data and the other for any data. Our protocols tolerate Byzantine failures with fewer servers than existing solutions by eliminating nonessential work in the write protocol and by using read and write quorums of different sizes. Since engineering a reliable network layer on an unreliable network is difficult, two other possibilities must be explored. The first is to strengthen the model by allowing synchronous networks that use time-outs to identify failed links or machines. We consider running synchronous and asynchronous Byzantine Quorum protocols over synchronous networks and conclude that, surprisingly, "self-timing" asynchronous Byzantine protocols may offer significant advantages for many synchronous networks when network time-outs are long. We show how to extend an existing Byzantine Quorum protocol to eliminate its dependency on reliable networking and to handle message loss and retransmission explicitly.

A rapid spectrophotometric method for the determination of small amounts of triisooctylamine in aqueous solution is described. The method is based on the formation of a complex between the amine and cobalt thio-cyanate; the complex is developed in dilute sulphuric acid and is extracted with carbon

of finite games, such as Selten’s finitely repeated chain-store game or in the finitely repeated prisoners ’ dilemma. We reexamine Selten’s model, adding to it a “small ” amount of imperfect (or incomplete) information about players ’ payoffs, and we find that this addition is sufficient to give rise

for manipulation is milmimized, and sources of erroi ’ eimcountered in wash-ilmg by centrifugation are avoided. In applications of time oxalate method to small amounts of calcium, the limits of accuracy have beeim due chiefly, not so much to the pro-cedures used for measuring the precipitate, as to those used