Radiographic analysis of the structures of films obtained by vacuum sputtering of some copper-based low alloys

Diffractometric phase analysis of the structures of alloys on copper base, containing small concentrations of Mn, Pd, Al, Ti, Zr, Ce, and Ni, and of films on their base, was carried out. The differences in the structure of initial bulk samples of the alloys, and of condensates obtained by sputtering in vacuum, are discussed.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 11, pp. 101–105, November, 1973.     

Electrostatics, Hyperbolic Geometry and Wandering Vectors

A family of planar discrete electrostatic systems on the unitcircle with finitely atomic external fields is considered. Thegeometry of particles in the external field yielding a givenminimum energy configuration is studied. As an application,the wandering vectors of the shift operator in the Dirichletspaces associated with finitely atomic measures are also studied.In particular, the zero locus of a wandering vector is discussed.     

Bis(dialkylamide)hydrogen dibromobromate precursors of hypobromite ion in reactions with nerve and blister agent simulants

Hypobromite ion, BrO(-), is an effective alpha-nucleophile that reacts rapidly with activated phosphorus(V) and sulfonate esters. The parent acid rapidly oxidizes organic sulfides and aryloxide ions. At pH 10-11 BrO(-) and HOBr coexist in water and are potentially useful as decontaminants of chlorosulfide blister agents and the phosphonyl nerve agents. Bis(dialkylamide)hydrogen dibromobromates are well characterized, stable, solids which rapidly form HOBr-BrO(-) in mildly alkaline water. Reactions of 4-nitrophenyl diethyl phosphate and phosphonate, which are simulants of the phosphonofluoridate nerve agents, and of 4-nitrophenyl tosylate, with BrO(-) are rapid (t(1/2) = 60-700 s) with 0.1 M BrO(-), under conditions in which oxidations of organic sulfides are too fast to be followed by conventional methods.     

Formation stage of a high-voltage pulsed discharge in a long tube

A study was made of discharges in long tubes (d 60–132 cm) in hydrogen through an analysis of the oscillograms of the discharge current and voltage pulses and through a photometric study. As the pressure increases from 0.4 to 5 torr and as the overvoltage decreases from 290 to 90%, the step current I_st decreases, while the times t_d, t_st, and t_f, which characterize the formation stage, increase. It is thus possible that the step forms as a result of the conversion of the avalanche-streamer maximum at the beginning of the formation stage to a cathode-directed streamer. The value pd 300 torr · cm found under the experimental conditions of this study corresponds to a transitional discharge mechanism.Translated from Izvestiya VUZ. Fizika, No. 8, pp. 128–133, August, 1970.The authors thank A. Ya. Sytnik for assistance in the measurements.     

Novel reactions of ninhydrin oxime with mercaptoalkanoic acids

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Determination of f(s)/f(d) for 7 TeV pp collisions and measurement of the B0→D-K+ branching fraction

The relative abundance of the three decay modes B(0)→D(-)K(+), B(0)→D(-)π(+), and B(s)(0)→D(s)(-)π(+) produced in 7 TeV pp collisions at the LHC is determined from data corresponding to an integrated luminosity of 35 pb(-1). The branching fraction of B(0)→D(-)K(+) is found to be B(B(0)→D(-)K(+)) = (2.01 ± 0.18(stat) ± 0.14(syst)) × 10(-4). The ratio of fragmentation fractions f(s)/f(d) is determined through the relative abundance of B(s)(0)→D(s)(-)π(+) to B(0)→D(-)K(+) and B(0)→D(-)π(+), leading to f(s)/f(d) = 0.253 ± 0.017 ± 0.017 ± 0.020, where the uncertainties are statistical, systematic, and theoretical, respectively.     

Observation of X(3872)→J/ψγ and search for X(3872)→ψ'γ in B decays

We report a study of B→(J/ψγ)K and B→(ψ'γ)K decay modes using 772×10? B ?B events collected at the Υ(4S) resonance with the Belle detector at the KEKB energy-asymmetric e(+)e(-) collider. We observe X(3872)→J/ψγ and report the first evidence for χ(c2)→J/ψγ in B→(X_{c ?cγ)K decays, while in a search for X(3872)→ψ'γ no significant signal is found. We measure the branching fractions, B(B(±)→X(3872)K(±))B(X(3872)→J/ψγ)=(1.78(-0.44)(+0.48)±0.12)×10(-6), B(B(±)→χ(c2)K(±))=(1.11(-0.34)(+0.36)±0.09)×10(-5), B(B(±)→X(3872)K(±))B(X(3872)→ψ'γ)<3.45×10? (upper limit at 90% C.L.), and also provide upper limits for other searches.