No abstract available

[en] A surface-ionization mass spectrometer has been developed for real-time analysis of particles in air. The spectrometer is equipped with an efficient inlet for transmitting airborne particles directly to the ionizing filament in the ion source, a dispersive mass analyzer for simultaneous measurement of multiple ion beams, and an ion detecting and measuring system which can integrate ion bursts from individual particles over a threedecade size range. The desk-sized instrument requires only electrical power for operation and can be transported to different locations. (orig.)

[en] The author considers the computer control of the measurement program which is already available in modern mass spectrometers. Future areas for computer control are considered e.g. the heating program, ion optics and focusing, and sample changer control. (Auth.)

[en] The fundamental ionisation process of negative surface ionisation is described and two applications are discussed. One is in the so called surface-plasma sources which enable the production of intense negative ion beams. The second application is in the passive diagnosis of the charge exchange of neutrals emitted from hydrogen plasmas. (C.F.)

[en] Methods for calculation of multiatom charged particle interaction with the surface on the basis of experimental data obtained through variation of magnetic field applied to the surface is proposed. It is shown that the form of intermolecular interaction potential for triethylamine dissociate ion (M-H-⁺ coincides with the Lennard-Jones model potential 12-6. It is indicated also that this methodology makes it possible to determine the charge position relative the surface in the adsorbed multiatom ion

[en] Highlights: • Meralgia Paresthetica is a challenge for clinicians for both diagnosis and treatment. • There is no difference in treatment of meralgia paresthetica with ultrasound-guided injection or surgery. • Ultrasound-guided injection may be the most cost-effective treatment for MP if the examiner is well trained. To compare ultrasound (US)-guided injections and surgery for the treatment of meralgia paresthetica (lateral femoral cutaneous neuropathy).

[en] A new way of using electromagnetic surface waves to sustain large volume plasmas of overcritical electron density is described. The diameter of the plasma column, obtained by using the present method, can be relatively large to both the free space wavelength and the dimensions of the wave launcher. (author)

[en] We report on the experimental results of the ionization efficiency of Rb and Cs using a surface ionization source prototype at Rare Isotope Science Project (RISP) of Institute for Basic Science (IBS). A hot-cavity surface ionization source has been studied in an off-line test bench equipped with a mass separator and a beam diagnostic system which allow accurate ionization efficiency measurements. Ionization efficiencies of 76% and 77% have been measured for Rb and Cs, respectively, from the Ta prototype of the RISP surface ionization source.

[en] The possibility of utilizing the phenomena of positive and of negative surface ionization in connection with a mass separator for a rapid discrimination or even a selective separation of isobar nuclides of certain elements is discussed and supported by experimental results. Whereas on a clean metal surface (e.g. tungsten) only alkali elements are efficiently ionized by positive surface ionization, certain other elements may also be manipulated to have high ionization-efficiency values by increasing the work function of the substrate with a regulated coverage of electronegative ad-particles (e.g.oxygen). A preselection of such elements is thus possible if under the same surface conditions isobar nuclides of the neighbouring elements have very small values of the ionization efficiency. In the case of neighbouring elements having almost equal values of the ionization energy, other surface effects can often be utilized for an identification of the nuclides: 1)the desorption of some elements in the form of oxides under special conditions of temperature and oxygen pressure, and (2) the high desorption energy of certain elements which prectically do not desorb at lower temperatures. Thus, apart from the nuclides of the alkalis, those of a variety of other elements (e.g.earth alkalis and elements of the IIIb group) may be identified with the help of positive surface ionization. The negative surface ionization can be used for a selective separation of the elements of the halogen group. In this case high values of the ionization efficiency can be obtained only at low values of the work function. Preliminary results which have been obtained by a deposition of electropositive ad-layers on a tungsten surface are reported. (Auth.)

[en] Highlights: • Midtarsal sprain appears to be a frequent injury in professional soccer players after ankle trauma. • It may occur with or without concomitant ankle sprain. • The presence of midtarsal sprain may result in prolonged time of return to play. • Radiologists should be aware of signs of midtarsal sprain on MRI in order to be able to make an accurate diagnosis. Ankle sprain is a common injury in professional soccer, but to date midtarsal sprain has not been investigated in this context. The purpose of this study was to determine the prevalence of midtarsal sprain by MRI and to assess its impact on the time of return to play in professional soccer players.