Sausage oscillations of coronal loops

Aims. Analytical theory predicts the existence of trapped global (or fundamental) sausage fast magnetoacoustic modes in thick and dense coronal loops only, with the periods estimated as the ratio of double the loop length and the Alfvén speed outside the loop. We extend this study to the leaking regime, considering global sausage modes of long loops with small density contrasts. Methods. Anti-symmetric fast magnetoacoustic perturbations (sausage, or m = 0 modes) of a low β plasma slab with the symmetric Epstein profile of plasma density are modelled numerically. Results. It was found that long loops with sufficiently small density contrast can support global sausage leaky modes of detectable quality. The periods of the leaky modes are found to be approximately determined by the loop length and the external Alfvén speed. If the loop length can be estimated from imaging observations, the observed period of this mode provides us with the information about the Alfvén speed outside the loop. For typical flaring coronal loops, the estimated periods of the global sausage modes are about 5−60 s

Solid-state active media of tunable organic-compound lasers pumped with a laser. I. An XeCl laser

Оцифровано в НБ ТГ

Study of the joint action of coenzyme Q10 and royal jelly on the hematological and spirometric indicators in the elite athletes

Objective: to study the effects of royal jelly and coenzyme Q10 administered with food on the number of hematological and spirometric indicators in elite swimmers in precompetitive period. Materials and methods: 16 highly qualified athletes at the age of 19,8±0,6 years participated in the study. Content of erythrocytes and different white blood cells and level of hemoglobin in the blood of the athletes were measured using hematology analyzer «Abacus Junior 30». The measurement of respiratory volume, respiratory minute volume, respiratory frequency, рO2 and рCO2 in expired air, alveolar рO2 and рCO2 in the subjects was made using anesthesia breathing apparatus «Capnomac Ultima». Results: the administration of the above mix by the athletes stimulates the immune system and the oxygen-transporting function of blood, activates the functional state of pulmonary tissue, increases the oxygen consumption and improves physical performance. Conclusions: the effect of preventive therapy on the analyzed parameters in highly qualified swimmers determine the feasibility of the competent intake of composition «royal jelly-ubiquinone-10-honey» before and during major competitions when the requirements are high

On relativization of the Sommerfeld-Gamow-Sakharov factor

The Sommerfeld-Gamow-Sakharov factor is considered for the general case of arbitrary masses and energies. It is shown that the scalar triangular one-loop diagram gives the Coulomb singularity in radiative corrections at the threshold. The singular part of the correction is factorized at the complete Born cross section regardless of its partial wave decomposition. Different approaches to generalize the factor are discussed.Comment: 9 pages, 4 figures; references and discussion are extende

Влияние способа получения динамических термопластичных вулканизатов на основе полиэтилена и 1,2-полибутадиена на их свойства

Blends based on polyethelene and 1,2-polybutadiene were studied. The influence of methods for obtaining dynamically vulcanized thermoelastoplastic composites on the kinetics of DTPV structure formation, rheological and mechanical characteristics of samples was investigated.Исследованы композиции на основе ПЭ и 1,2-полибутадиена. Показано влияние способа получения динамических термоэластопластов на кинетику формирования структуры, реологические и механические характеристики получаемых образцов

Development of fruit diseases of microbial origin during storage at treatment with antioxidant compositions

Встановлено, що досліджува- ні антиоксидантні композиції при- гнічували розвиток епіфітних мікро- організмів на поверхні плодів протя- гом зберігання. Було зафіксовано під- вищення їх стрес-толерантності. Результати експерименту доводять зменшення рівня щодобових втрат від мікробіологічних захворювань у 2…3,5 разів. Найбільший позитивний ефект при зберіганні усіх видів плодів був отриманий при обробці компози- цією на основі дистинолу і лецитин