The branching ratio for K−p → Λγ at rest

The reaction K^?p → Λγ, produced by K^? stopping in a liquid hydrogen target, has been studied using a NaI(Tl) gamma-ray spectrometer. The branching ratio is

$\text{K}{}^{\mathrm{?}}\text{p}\text{→Λγ}\text{K}{}^{\mathrm{?}}\text{p}\text{→}\text{anything}\text{=(2.8±0.8)×10}{}^{\mathrm{?3}}$

based on 1355 events assigned to this branch. This is in conflict with a previous experiment, but agrees with one of the two published calculations, when recent values for the coupling constants and scattering amplitudes are used.     

1-Aryl-4,6-diamino-1,2-dihydro-s-triazines. Contrasting effects on intestinal helminths,bacteria, and dihydrofolic reductase

The preparation of a variety of novel 1-aryl-4,6-diamino-1,2-dihydro-s-triazines is described. These compounds exhibit an array of contrasting effects on intestinal helminths, bacteria, and dihydrofolic reductase. It is concluded that potent anthelmintic activity among the dihydro-triazines is not dependent solely on the bulky-substituent hypothesis advanced by other investigators, and indeed cannot reliably be predicted on this basis.     

Mechanism, selectivity promotion, and new ultraselective pathways in Ag-catalyzed heterogeneous epoxidation

The selective oxidation of styrene on clean and modified Ag(100) surfaces has been studied by synchrotron fast XPS and temperature-programmed reaction spectroscopy. By following the time dependence of surface species, it is unequivocally demonstrated that the necessary and sufficient conditions for epoxide formation are oxygen adatoms and pi-adsorbed alkene molecules. Increased oxygen coverage and coadsorbed Cs have pronounced and opposite effects on epoxidation selectivity, consistent with the view that the valence charge density on O(a) is pivotal in determining this property. Submonolayer quantities of Cs nitrate generated in situ open a new, low-temperature ultraselective, epoxidation pathway thought to involve direct oxygen transfer from the oxyanion to the alkene.     

Who conceived the “complex viscosity”?

In small amplitude oscillatory shear flow, we now universally represent the response of a viscoelastic fluid as a complex quantity, which we call “complex viscosity.” This short piece deepens our understanding of the origins of the complex viscosity and of the man who coined this term, now widely used in rheology.     

The Synthesis of Some Bifunctionally Substituted [3,3,1] Propellanes

Convenient syntheses of some bifunctionally substituted [3.3.1] propellanes are reported from the readily accessible tricyclo[4.3.1^1,6] dec-3-en-8-ol.     

The value of information to decision makers: an experimental approach using card-based decision gaming

This paper describes a novel experimental method for determining the value of different types of information to military decision makers. The experimental method used a simple scenario and a set of serials constructed from cards, each presenting a single piece of information and presented sequentially. Each of a number of pairs of players were taken through the scenario and asked to judge when they would make each of a pair of escalating responses to the situation. The data proved well suited to analysis using a probit model and is consistent with the hypothesis of a Bayesian decision mechanism with normally distributed ‘action points’. The methodology allowed the determination of weights for each of a number of different classes of information, together with estimates of the human and situational elements of variation, including estimates of the ‘prior belief’ of the different pairs of players.     

Some remarks on James-Schreier spaces

The James-Schreier spaces Vp, where 1?p<∞, were recently introduced by Bird and Laustsen (in press) [5] as an amalgamation of James' quasi-reflexive Banach space on the one hand and Schreier's Banach space giving a counterexample to the Banach-Saks property on the other. The purpose of this note is to answer some questions left open in Bird and Laustsen (in press) [5]. Specifically, we prove that (i) the standard Schauder basis for the first James-Schreier space V₁ is shrinking, and (ii) any two Schreier or James-Schreier spaces with distinct indices are non-isomorphic. The former of these results implies that V₁ does not have Pe?czyński's property (u) and hence does not embed in any Banach space with an unconditional Schauder basis.