Шиншилловодство - перспективное направление пушного звероводства в России

In given article it is told about a new direction of fur fur breeding in Russia - chinchilla breeding. About correctness of chinchillas' maintenance, leaving, feeding and breeding. How to get qualitative posterity from the best manufacturers. Also in article various norms of chinchillas' feeding and breeding in polygamous type cages are resulted. And also the theme of fur estimation and animals' genetics is mentioned.В данной статье рассказывается о новом направлении пушного звероводства в России - шиншилловодстве. Приведены различные нормы кормления и разведения шиншилл в клетках полигамного типа. Затронута также тема меховой оценки и генетики зверей

Анализ кариотипов домашней собаки (Canis familiaris L.)

Karyotypes of sheltie and poodle breeds population of the city of Moscow are given. Describes the data on chromosomal abnormalities that occur in dogs. There are cases of chimerism and mosaicism for sex chromosomes. It is shown that in the case of chimerism on the sex chromosomes of male, repro-ductive function was normal.Описаны кариотипы собак пород шелти и пудель из популяции города Москвы. Приведены данные о хромосомных аномалиях, встречающихся у собак. Описаны случаи химеризма и мозаицизма по половым хромосомам. Показано, что в случае химеризма по половым хромосомам воспроизводительная функция у кобеля была в норме

Development of a Momentum Determined Electron Beam in the 1 -45 GeV Range

A beam line for electrons with energies in the range of 1 to 45 GeV, low contamination of hadrons and muons and high intensity up to 10^6 per accelerator spill at 27 GeV was setup at U70 accelerator in Protvino, Russia. A beam tagging system based on drift chambers with 160 micron resolution was able to measure relative electron beam momentum precisely. The resolution sigma_p p was 0.13% at 45 GeV where multiple scattering is negligible. This test beam setup provided the possibility to study properties of lead tungstate crystals (PbWO_4) for the BTeV experiment at Fermilab.Comment: 12 pages, 8 figures; work done by the BTeV Electromagnetic Calorimeter grou

Correlation of Beam Electron and LED Signal Losses under Irradiation and Long-term Recovery of Lead Tungstate Crystals

Radiation damage in lead tungstate crystals reduces their transparency. The calibration that relates the amount of light detected in such crystals to incident energy of photons or electrons is of paramount importance to maintaining the energy resolution the detection system. We report on tests of lead tungstate crystals, read out by photomultiplier tubes, exposed to irradiation by monoenergetic electron or pion beams. The beam electrons themselves were used to measure the scintillation light output, and a blue light emitting diode (LED) was used to track variations of crystals transparency. We report on the correlation of the LED measurement with radiation damage by the beams and also show that it can accurately monitor the crystals recovery from such damage.Comment: 9 pages, 6 figures, LaTeX2

Comparison of Radiation Damage in Lead Tungstate Crystals under Pion and Gamma Irradiation

Studies of the radiation hardness of lead tungstate crystals produced by the Bogoroditsk Techno-Chemical Plant in Russia and the Shanghai Institute of Ceramics in China have been carried out at IHEP, Protvino. The crystals were irradiated by a 40-GeV pion beam. After full recovery, the same crystals were irradiated using a $^{137}Cs$ $\gamma$-ray source. The dose rate profiles along the crystal length were observed to be quite similar. We compare the effects of the two types of radiation on the crystals light output.Comment: 10 pages, 8 figures, Latex 2e, 28.04.04 - minor grammatical change

LED Monitoring System for the BTeV Lead Tungstate Crystal Calorimeter Prototype

We report on the performance of a monitoring system for a prototype calorimeter for the BTeV experiment that uses Lead Tungstate crystals coupled with photomultiplier tubes. The tests were carried out at the 70 GeV accelerator complex at Protvino, Russia.Comment: 12 pages, 8 figures, LaTeX2e, revised versio

Design and performance of LED calibration system prototype for the lead tungstate crystal calorimeter

A highly stable monitoring system based on blue and red light emitting diodes coupled to a distribution network comprised of optical fibers has been developed for an electromagnetic calorimeter that uses lead tungstate crystals readout with photomultiplier tubes. We report of the system prototype design and on the results of laboratory tests. Stability better than 0.1% (r.m.s.) has been achieved during one week of prototype operation.Comment: 10 pages, 6 figures, LaTeX2

Study of Radiation Damage in Lead Tungstate Crystals Using Intense High Energy Beams

We report on the effects of radiation on the light output of lead tungstate crystals. The crystals were irradiated by pure, intense high energy electron and hadron beams as well as by a mixture of hadrons, neutrons and gammas. The crystals were manufactured in Bogoroditsk, Apatity (both Russia), and Shanghai (China). These studies were carried out at the 70-GeV proton accelerator in Protvino

Marx generator GIN-1000 with 1 MV output voltage and 80 kJ stored energy

The results of development and study of Marx generator with output voltage of 1 MV and stored energy of 80 kJ are reported. The measured value of generator inductance is ~1.3 µH, the measured effective ohmic resistance ~ 1 Ohm.Приведены результаты разработки и исследования генератора Маркса с выходным напряжением 1 МВ, запасаемой энергией 80 кДж. Измеренное значение индуктивности генератора составляет ~1,3 мкГн, измеренное эффективное омическое сопротивление ~1 Ом.Наведено результати розробки і дослідження генератора Маркса з вихідною напругою 1 МВ, що запасає енергією 80 кДж. Виміряне значення індуктивності генератора становить ~1,3 мкГн, виміряний ефективний омічний опір ~1 Ом