[en] Wall losses can cause a coupling between eigenmodes in a cavity. The magnitude of the effect can be determined by means of eigenmode expansion. The influence on rise time of forced oscillations is calculated. Results for a brick resonator and a six-cell iris structure are presented

[en] Distributions of propagation time of one-photoelectron signal through the photomultiplier during illumination of separate PhEhU-49B photocathode points ( as well as in course of photocathode uniform illumination) by short light pulses are experimentally measured. The width of distribution of one-photoelectron signal propagation time through the photomultiplier at half height of distribution maximum during uniform photocathode illumination constitutes 19 ns and is defined by photocathode periferal regions

No abstract available

[en] The timing properties of photomultipliers used in single photon experiments are reviewed. The main problems encountered in applications to measurement of the shape of fast light pulses and determination of the statistical characteristics of light beams are examined

No abstract available

[en] A cylinder experiment was conducted in northern Greece during 2005 and 2006 to assess emergence dynamics of barnyardgrass (Echinochloa crus-galli (L.) Beauv.) and jimsonweed (Datura stramonium L.) in the case of a switch from conventional to conservation tillage systems (CT). Emergence was surveyed from two burial depths (5 and 10 cm) and with simulation of reduced tillage (i.e. by soil disturbance) and no-till conditions. Barnyardgrass emergence was significantly affected by burial depth, having greater emergence from 5 cm depth (96%) although even 78% of seedlings emerged from 10 cm depth after the two years of study. Emergence of barnyardgrass was stable across years from the different depths and tillage regimes. Jimsonweed seeds showed lower germination than barnyardgrass during the study period, whereas its emergence was significantly affected by soil disturbance having 41% compared to 28% without disturbance. A burial depth x soil disturbance interaction was also determined, which showed higher emergence from 10 cm depth with soil disturbance. Jimsonweed was found to have significantly higher emergence from 10 cm depth with soil disturbance in Year 2. Seasonal emergence timing of barnyardgrass did not vary between the different burial depth and soil disturbance regimes, as it started in April and lasted until end of May in both years. Jimsonweed showed a bimodal pattern, with first emergence starting end of April until mid-May and the second ranging from mid-June to mid-August from 10 cm burial depth and from mid-July to mid-August from 5 cm depth, irrespective of soil disturbance in both cases. (Author)

No abstract available

[en] It is supposed to carry out investigation of delayed showers caused by hadrons and clusters generated in production of extensive air showers (EAS) using a device for studying EAS. The method will be used in combination with others to separate 'pure' EAS formed by γ-quanta of EAS formed by hadrons

No abstract available

[en] The authors describe the characteristics of a fast-response tide gauge suitable for shallow-water conditions. Its time constant is of the order of minutes. Wind waves are filtered better than 99% in the (0/10) s interval. The tide gauge has now been operative for three years on an oceanographic tower in the open sea. (author)