Contamination of soil with lead has occurred on a global scale. Exposure to lead may cause adverse effects to human health and the environment. It is therefore desirable to obtain a quantitative estimate of the potential risk of lead contamination. Numerous studies have been conducted collecting lead concentration data from both natural and contaminated soil on a range of scales. Very few of th...

Charm photoproduction rates off nuclei below the nucleon threshold are estimated using the phenomenologically known structure functions both for x < 1 and x > 1. The rates rapidly fall below the threshold from values ∼10 pb for Pb close to the threshold (at 7.5 GeV) to ∼1pb at 6 GeV.

A structural model of the recently observed silicene-like nanoribbons on a Pb-induced √3 × √3 reconstructed Si(111) surface is proposed. The model, which is based on first principles density functional theory calculations, features a deformed honeycomb structure directly bonded to the Si(111) surface underneath. Pb atoms stabilize the nanoribbons, as they passivate the uncovered substrate, thus...

We use angle-resolved photoemission with circularly polarized excitation to demonstrate that in the 5 x 1 superstructure-free (Pb,Bi)(2)Sr(2)CaCu(2)O(8+delta) (Pb-Bi2212) material there are no signatures of time-reversal symmetry breaking in the sense of the criteria developed earlier [Nature (London) 416, 610 (2002)]]. The dichroic signal retains reflection antisymmetry as a function of temper...

The mol-ecule of the title compound, [Pb(2)(C(10)H(8)NO)(2)(NO(3))(2)(CH(3)OH)(2)], lies about a centre of inversion. The Pb atom is chelated by nitrate and substituted quinolin-8-olate anions. The O atom of the quinolin-8-olate also bridges, to confer a six-coordinate status on the metal centre. When a longer Pb⋯O inter-action is considered, the geometry approximates a Ψ-cube in which one of t...

Recent results in parity nonconserving neutron-nucleus scattering show a tendency for the parity nonconserving effects to predominantly have the same sign. Explanations of this phenomenon all require a weak matrix element between single-particle levels in heavy nuclei to be ~100 eV. This paper contains a discussion of this effect and how the same phenomenon will manifest itself in other systems...

We have studied electron states present at the Pb(111) surface above Ar-filled nanocavities created by ion beam irradiation and annealing. Vertical confinement between the parallel crystal and nanocavity surfaces creates a series of quantum well state subbands. Differential conductance data measured by scanning tunneling spectroscopy contain a characteristic spectroscopic fine structure within ...

The magnetic moment of the Z hyperon has been obtained from measurements of finestructure splittixgs of x-ray transitions in Z" exotic atoms. The use of targets consisting of sheets of Pb or immersed in liquid hydrogen, and of a tagging technique utilizirg the m emitted in the reaction K p Z 7t, resulted in improved x-ray signal-tonoise ratio by a factor of 15 over that in previous experiments....

Methods Three main lupus centers from Europe were included in this study. One of these centers was mainly a pediatric nephrology center from UK whereas one was a pediatric rheumatology center from Italy and the last one was a joint one from Turkey. Features present at onset in childhood-onset SLE (cSLE) patients, diagnosed and followed by these three departments between January 2000 to December...