437 research outputs found
Method for Prevention of Solid Dissolution Through Covalent Ligand Bonding
Methods for preventing dissolution of solid substrates, such as metal leaching from coal or corrosion of metal surfaces, are provided.
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Catalytic Cleavage of Phosphate Ester Bonds by Boron Chelates
Novel chemical compounds are disclosed having the general formula L{YXm}n, wherein X is selected from the Group 13 elements, Y is a halide, and L is a chelating ligand containing at least one binding atom contacting the Group 13 element, the atom being selected from the group consisting of C, N, O, and S, and m and n are integers having a value of at least 1. L may be a Schiff base type ligand, such as a salen ligand. The compositions of the present invention may be bidentate, quadridentate, or greater. The compositions may be used in dealkylation of phosphate esters or ethers. Advantageously, the methods of the present invention may be rendered catalytic
Use of Boron Compounds to Precipitate Uranium from Water
A method is provided for removing uranium from water. The method includes the mixing of a boron reagent with water contaminated with uranyl dication ions, leading to removal of the uranium from that water
Cleavage of Phosphate Ester Bonds by Use of Novel Group 13 Chelate Compounds
A novel chemical compound has a general formula (LX)nY wherein X is selected from a group consisting of a group 13 element other than boron, Y is selected from a group consisting of a halide, a chlorate, a sulfate and a nitrate and L is a chelating ligand containing two nitrogen and two oxygen donor groups where n=1 or 2
Lifetime Differences in Heavy Mesons With Time Independent Measurements
Heavy meson pairs produced in the decays of heavy quarkonium resonances at e+
e- machines (beauty and tau-charm factories) have the useful property that the
two mesons are in the CP-correlated states. By tagging one of the mesons as a
CP eigenstate, a lifetime difference of heavy neutral meson mass eigenstates
width difference may be determined by measuring the leptonic branching ratio of
the other meson. We discuss the use of this and related methods both in the
case where time dependent mixing is small and when it is significant. We
consider the impact of possible CP-violating effects and present the complete
results for CP-entangled decay rates with CP-violation taken into account.Comment: 14 pages, 0 figures; 2 references added, results unchange
Getting beta-alpha without penguins
Oscillation effects in B0 -> Ks D0 and related processes are considered to
determine delta=beta-alpha+pi. We suggest that D0 decays to CP eigenstates used
in concert with inclusive D0 decays provide a powerful method for determining
delta cleanly i.e. without any complication from penguin processes. The CP
asymmetry is expected to be <=40% for D0 decays to non-CP eigenstates and <=80%
for decays to CP eigenstates. This method can lead to a fairly accurate
determination of delta with O(10^8-10^9) B-mesons.Comment: 4 pages 1 figure; Version 2: minor changes; references added; Some
changes in response to Referee Comment
Signature of heavy Majorana neutrinos at a linear collider: Enhanced charged Higgs pair production
A charged Higgs pair can be produced at an ee collider through a t-channel
exchange of a heavy neutrino (N) via e^+ e^- -> H^+ H^- and, if N is a Majorana
particle, also via the lepton number violating (LNV) like-sign reaction e^\pm
e^\pm \to H^\pm H^\pm. Assuming no a-priori relation between the effective
eNH^+ coupling (\xi) and light neutrino masses, we show that this interaction
vertex can give a striking enhancement to these charged Higgs pair production
processes. In particular, the LNV H^-H^- signal can probe N at the ILC in the
mass range 100 GeV < m_N < 10^4 TeV and with the effective mixing angle, \xi,
in the range 10^{-4} < \xi^2 < 10^{-8} - well within its perturbative unitarity
bound and the neutrinoless double beta decay (\beta\beta_{0\nu}) limit. The
lepton number conserving (LNC) e^+ e^- \to H^+ H^- mode can be sensitive to,
e.g., an O(10) TeV heavy Majorana neutrino at a 500 GeV International Linear
Collider (ILC), if \xi^2 > 0.001.Comment: Latex, 5 pages, 3 figures. V2 as published in PR
Multidentate Sulfur-Containing Ligands
Novel sulfur-containing ligands for binding of heavy metals are disclosed.
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