Solving the subproblem in the lagrangian dual of separable discrete programs with linear constraints

This note presents an efficient method for the routine solution of the subproblem associated with the Lagrangian dual of discrete programming problems having separable non-linear objective function and linear constraints. An additional advantage for subgradient methods is described.     

Studies of a TEA CO2 laser with a cylindrical mirror unstable resonator

We describe the results of a study of a TEA CO₂ laser using a strip cylindrical unstable resonator which produces an output beam with suitable characteristics for producing a high quality line focus. Using this technique an irradiance of ?10⁹W cm^-2 over a 5 cm long line focus has been achieved.     

The measured energy loss of high energy electrons in aluminum

The energy distributions of electrons of about 54, 75 and 97 Mev have been measured before and after passing through aluminum absorbers of thicknesses ranging from 0.730 to 5.574 gm/cm². The electrons were accelerated by the LINAC of the Naval Postgraduate School. The most probable energy losses agree with the theory ofBlunck andWestphal for all thicknesses; the half widths of the distributions agree with theory except for large thicknesses, where they exceed the theoretical values. These results are in contrast to those ofBreuer, which indicate systematically large half widths and most probable energy losses which are greater than theory for thicknesses greater than about 2 gm/cm². Since our data agree with those ofBreuer, the difference occurs in the treatment of the theory.     

Čerenkov spectroscopic assay of fission isotopes

This work is a practical application of a previously published procedure for non-destructive, simultaneous determinations of⁹⁰Sr and¹³⁷Cs in aqueous solutions in presence of each other, by a combined use of erenkov counting and -spectrometry. The technique is being used to examine the ion-exchange and retention capacities of three types of zeolites as functions of pH and NaNO₃ concentration. Conclusions are drawn on the usefulness of these procedures and counting techniques in studying the removal of radiostrontium and radiocaesium from aged radioactive waste solutions.Part of this work was presented at the 7th International Zeolite Conference, Tokyo, August 17–22, 1986.     

On the instability of taylor and dean flows under the influence of a circular magnetic field

Résumé On discute l'influence d'un champ magnétique circulaire sur la stabilité d'un fluide visqueux et conducteur de l'électricité en mouvement entre deux cylindres circulaires coaxiaux. Supposant que l'espacement entre les cylindres est petit par rapport à leurs rayons, on donne des résultats sur deux sortes de mouvement du fluide basique, produites par la rotation des cylindres et par un gradient de pression autour des cylindres. On démontre que le champ magnétique peut avancer ou retarder l'accrochage de l'instabilité, suivant les circonstances.     

CO2 laser-induced decomposition of propan-2-ol,butan-2-ol,pentan-2-ol,pentan-3-ol,and hexan-2-ol

The pulsed CO₂ laser-induced decompositions of propan-2-ol, butan-2-ol, pentan-2-ol, pentan-3-ol, and hexan-2-ol in the gas phase have been investigated. Like ethanol which we examined previously [1] the absorption cross section of propan-2-ol for pulsed 9R14 radiation increases with pressure at low pressures, an effect attributed to rotational hole-filling. In contrast the absorption cross section of butan-2-ol (10R24) has only a small pressure dependence and those of pentan-2-ol (9R26), pentan-3-ol (10R14), and hexan-2-ol (9P20) show little or no variation with pressure in the range 0.1–5.0 torr. Decomposition products have been investigated at low pressure where the excitation of the alkanols was essentially collision free. The observed products for all the alkanols can be rationalized on the basis of primary dehydration and C? C fission channels, with minor contributions from other molecular eliminations. © 1994 John Wiley & Sons, Inc.     

Subnanosecond mid-infrared laser pulse generation by synchronous mode-locked CO2 laser pumping

An injection mode-locked CO₂ laser has been used to synchronously pump NH₃ and C₂D₂ mid-infrared lasers resulting in the generation of short (? 1 ns) and powerful (> 1 MW) pulse trains.     

Electrochemical studies on three polar diruthenium(II,III) complexes

Electrochemical studies on a new class of diruthenium(II,III) compounds were done. The complexes having a polar arrangement of ligands across the diruthenium unit in Ru₂Cl(hp)₄(Hhp), Ru₂Cl(chp)₄ and Ru₂Cl(PhNpy)₄ where Hhp, Hchp and PhNHpy are 2-hydroxypyridine, 6-chloro-2-hydroxypyridine, and 2-anilinopyridine, respectively, undergo two or more oxidations and reductions. The metal centered reductions in the range of +0.1 to ?0.75 V and oxidations in the range +0.5 to +1.2 V are discussed and compared with diruthenium carboxylato and amidato complexes.     

Reversible bond formation in a gold-atom-organic-molecule complex as a molecular switch

We report on the formation of a metal-molecule complex that can be used as a molecular switch. Using a cryogenic scanning tunneling microscope, a covalent bond was formed reversibly between a gold atom and a perylene-3,4,9,10-tetracarboxylic dianhydride molecule supported by a thin insulating film. The bonded and the nonbonded state of the complex were found to be associated with different charge states, and the switching between the two states was accompanied by a considerable change in the tunneling current. Atomic force microscopy molecular imaging was employed to determine precisely the atomic structure of the complex, and the experimental results were corroborated by density functional theory calculations.