Dear Sir,?The paper on ' Conservative surgery in malignant disease' by Dr. T. Howard Somervell, appearing in your March issue, opens up several avenues of partly criticism and partly controversy. Dr. Somervell gives a sarcoma patient ' a full course of deep x-ray therapy' to the growth and its immediate neighbourhood before operation. This course consists of five minutes of 5 milliamps at a 5-i...

The Richardson exact solution for the reduced BCS Hamiltonian is applied to examine how sensitive are the pairing characteristics (condensation energy, spectroscopic gap, parity gap) to a specific configuration of single-electron energy levels in nanosize metallic grains. Using single-electron energy spectra in parallelepiped-shaped potential boxes with various volumes and aspect ratios as a mo...

• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website. • The final author version ...

Abstract: In this study, using density functional theory and the SIESTA computationalcode, we investigate the electronic and optical properties of the armchair graphenenanoribbons and the armchair boron nitride nanoribbons of width 25 in the presence of atransverse external electric field. We have observed that in the absence of the electricfield, these structures are se...

The feasibility of using an exploding mercury jet as a high current opening switch has been evaluated at peak currents ranging from 7 kA to 125 kA. To provide a more realistic measure of actual performance, a spark gap was used to switch peak currents into varying RL loads. The roles of magnetic pinching, ionization, and skin effects in determination of scaling behavior and reproducibility are ...

We study and compare the gap and the Riesz topologies of the space of all unbounded regular operators on Hilbert C*-modules. We show that the space of all bounded adjointable operators on Hilbert C*-modules is an open dense subset of the space of all unbounded regular operators with respect to the gap topology. The restriction of the gap topology on the space of all bounded adjointable operator...

The bulk lifetimes of minority ,carriers in n-type l :germanium, in both n and p-type silicon and in n-type magnesium germanide have been investigated at room temperature. The sample was illuminated with periodic light ·flashes produced by a spark gap. The transient change in conductance of the sample after illumination gave the lifetime. In germanium and silicon the measured bulk lifetimes had...

The fatigue damage calculated for an aircraft by the Individual Aircraft Tracking (IAT) programs is dependent on the quality of input data. When the input data quality is poor or invalid, aircraft operators resort to gap-filling techniques to account for missing or invalid data. Invariably, conservative estimates of fatigue damage are obtained by imposing severe penalties for invalid or missing...