PURPOSE Due to the current interest in MRI-guided radiotherapy, the magnetic properties of the materials commonly used in radiotherapy are becoming increasingly important. In this paper, measurement results for the magnetization (BH) curves of a range of sintered heavy tungsten alloys used in radiation shielding and collimation are presented. METHODS Sintered heavy tungsten alloys typically c...

To evaluate a possible influence of confounding in risk estimation for lung cancer in relation to silica dust exposure, we re-analyze a recently published exposure-response relationship using a sub-cohort of Chinese tungsten miners which has no relevant occupational confounders. The cohort of tungsten miners consisted of 19,007 workers in six tungsten mines with a follow-up period from January ...

The tungsten-iron-sulfur enzyme acetylene hydratase stands out from its class because it catalyzes a nonredox reaction, the hydration of acetylene to acetaldehyde. Sequence comparisons group the protein into the dimethyl sulfoxide reductase family, and it contains a bis-molybdopterin guanine dinucleotide-ligated tungsten atom and a cubane-type [4Fe:4S] cluster. The crystal structure of acetylen...

This study assessed 3D WO3–TiO2 nanoflowers (WTNF) synthesized by a combined hydrothermal–ultrasonication–impregnation method for their applicability to the treatment of aromatic volatile compounds under visible-light illumination. The scanning electron microscopy exhibited the formation of 3D structures in the prepared WTNF samples. The X-ray diffraction patterns and energy dispersive X-ray re...

Fluorinated tungsten calix[4]arene imido complexes were synthesized and used as receptors to detect and differentiate neutral organic compounds. It was found that the binding of specific neutral organic molecules to the tungsten centers induces an upfield shift of the fluorine atom appended on the arylimido group, the extent of which is highly dependent on electronic and steric properties. We d...

The effect of tungsten erosion, transport, and redeposition on the operation of dispenser hollow cathodes was investigated in detailed examinations of the discharge cathode inserts from 8200 h and 30 352 h ion engine wear tests. Erosion and subsequent redeposition of tungsten in the electron emission zone at the downstream end of the insert reduce the porosity of the tungsten matrix, preventing...

Alkylation of HfCl4 with 6 equiv of ethyllithium followed by the addition of N,N,N′,N′-tetramethylethylenediamine gives the d hafnium(II) alkyl/alkene complex [Li(tmed)]2[HfEt4(C2H4)]. The X-ray crystal structure of this complex shows that the ethylene ligand has considerable metallacyclopropane character. The C-C distance of 1.49(6) Å and the JCH coupling constant of 119 Hz both support this f...

Recently reported results on the behaviour of the tungsten under conditions expected in the Neutrino Factory target have strengthened the case for a solid target option for the Neutrino Factory. This paper gives a description of the measurements of the surface motion of tungsten wires, stressed by a pulsed current, using a Laser Doppler Vibrometer in order to measure tungsten properties at high...

Riveting tasks in aircraft manufacturing results in exposure to vibration from both rivet guns and bucking bars. Long term exposure to vibration has been associated with symptoms of vibration white finger and musculoskeletal disorders. Four different bucking bars of the same shape but different material and mass characteristics (90% tungsten, >90% tungsten, cold rolled and stainless steel) were...

The carbene-C ,N chelate tetracarbonyl tungsten complex [(CO)4/ W C(Ph)NHC5H4N /-o ] (4), obtained from [(CO)5W / C(Ph)OMe] (3) and o -aminopyridine, reacts with iodine by oxidative decarbonylation to give a single isomer of the carbene-C ,N chelate tricarbonyl dihalogeno tungsten(II) complex [(CO)3I2/ W C(Ph)NHC5H4N /-o ] (5). The analogous reaction of 4 with bromine affords two interconvertin...