A fast front-end electronics for the RPC detector in the HARP experiment

A fast 8-channel summing preamplifier and a 16-channel splitter for the readout of the resistive plate chambers in the HARP detector at the CERN Proton Synchrotron are presented. The on-chamber summing preamplifier has an equivalent input noise of less than 10 fC r.m.s., an amplification of 100 mV/pC and less than 1 ns peaking time. The splitter splits the signals from the summing preamplifier into a timing path and a charge path. In the timing path, the signal amplitude is further amplified by a factor of 10 and then discriminated at a 50 mV threshold. The time-over-threshold signal has an intrinsic time skew of less than 15 ps. The discriminator output is sent via twisted-pair cables to a commercial time-to-amplitude converter. In the charge path, the signal is also amplified and sent via twisted-pair cables to a commercial charge-to-amplitude converter

Four-gap glass RPC as a candidate to a large area thin time-of-flight detector

A four-gap glass RPC with 0.3mm gap size was tested with hadron beam as a time-of-flight detector having a time resolution of ~ 100ps. A thickness of the detector together with front-end electronics is ~ 12mm. Results on time resolution dependently on a pad size are presented. This paper contains first result on the timing RPC (with ~ 100ps resolution) having a strip read-out. Study has been done within the HARP experiment (CERN-PS214) R&D work. A obtaned data can be useful if a design of a large area thin timing detector has to be done.Comment: 18 pages, 13 figure

Polaris B, an optical companion of Polaris (alpha UMi) system: atmospheric parameters, chemical composition, distance and mass

We present an analysis of high-resolution spectroscopic observations of Polaris B, the optical companion of the Polaris Ab system. The star has a radial velocity V_r of -16.6km/s to -18.9km/s, and a projected rotational velocity vsini=110 km/s. The derived atmospheric parameters are: Teff=6900K; logg=4.3; V_t=2.5km/s. Polaris B has elemental abundances generally similar to those of the Cepheid Polaris A (Usenko et al. 2005a), although carbon, sodium and magnesium are close to the solar values. At a spectral type of F3V Polaris B has a luminosity of 3.868L_sun, an absolute magnitude of +3.30mag, and a distance of 109.5pc. The mass of the star is estimated to be 1.39M_sun, close to a mass of 1.38+/-0.61M_sun for the recently-resolved orbital periods companion Polaris Ab observed by Evans et al. (2007).Comment: 6 pages, 3 figures, 1 tabl

Methodical culture of a teacher as a part of his professional mastery

The article tells about some basic demands to the teachers’ training. The article shows the experience of work in secondary school on developing some teacher’s competences represented above (on the example of activity of Secondary school №75/42, Nizhny Tagil city, Sverdlovsk region)В статье отражены основные требования к профессиональной подготовке педагогических кадров и показано, как выстроена работа в современной школе по развитию перечисленных компетенций учителя (на примере деятельности МБОУ СОШ №75/42, г. Нижний Тагил, Свердловская обл.

Контейнерные перевозки в глобальном рынке морской торговли

Усенко Е. А. Контейнерные перевозки в глобальном рынке морской торговли / Е. А. Усенко // Економіко-правовий розвиток сучасної України : матер. ІIІ Всеукр. наук. конф. студ., аспір. та молодих вчених (22-23 листопада 2013 р., м. Одеса) / за ред. д.е.н., проф. О. М. Кібік, д.ю.н., проф. О. П. Подцерковного ; Національн. ун-т «Одеська юридична академія» – Одеса : Фенікс, 2013. – С. 256-259