Колебания ледяного покрова и давления в морской воде вблизи фронта ледника Туна на Шпицбергене

Results of oceanographic measurements carried out in February, 2011, from the sea ice surface in the Tempelfjorden near the Tunabreen front in Svalbard are presented. Two temperature and pressure recorders SBE-39 were deployed on a wire from the ice approximately 300 m from the glacier front. The sampling time interval was 1 s. A pressure recorder SBE-37 was located under them on the bottom with a sampling interval of 6 s. Pressure oscillations on the bottom with a period of 90 s and ice cover oscillations with periods of 10 s and 14 s were recorded. The conclusion is made that the recorded oscillations of pressure in the sea water are related to the glacier microsurges, and the observed profiles of temperature, density, and salinity show the absence or insignificant inflow of fresh water from the glacier in the fjord during the winter season. The measurements allowed us to estimate the Young's modulus of the ice.Приводятся результаты океанологических исследований, выполненных в феврале 2011 г. с поверхности морского льда в Темпель-фьорде вблизи фронта ледника Туна на Шпицбергене. На расстоянии около 300 м от фронта ледника Туна в пробуренную во льду лунку на тросе были опущены два измерителя температуры и давления SBE-39 с дискретностью измерений 1 с. На дно установили измеритель температуры, электропроводности и давления SBE-37 с дискретностью измерений 6 с. Зарегистрированы колебания давления на дне с периодом 90 с и колебания поверхности льда с периодами 10 и 14 с. Сделан вывод, что эти колебания связаны с микроподвижками ледника, а измеренные профили температуры, плотности и солёности указывают на отсутствие или незначительное поступление пресной воды из ледника во фьорд в зимнее время. Оценена также величина упругого модуля для льда

Способы модуляции поляризованного света в астрономической аппаратуре

В статті наводяться основні методи і засоби модуляції поляризованого світла. Увагу зосереджено на модуляторах, побудованих на базі двигунів з порожнинним ротором.The basis methods and ways of modulation of the polarized light are resulted in article. the main attention is given to modulators, which are produced with using of electric motors with hollow rotor.В статье приводятся основные методы и способы модуляции поляризованного света. основное внимание сосредоточенно на модуляторах основанных электродвигателях с полым ротором

Drought resistance of winter soft wheat samples in the primary phase of organogenesis and change of leaf area and chlorophyll content in leaves under the conditions of water stress

There has been conducted laboratory assessment of drought resistance of winter soft wheat samples on an osmatic solution (sucrose 16 atm.). The maximum values of this indicator ranged from 70.0% (“Lidiya”) to 79.3% (“Asket”). According to the results of vegetation trials, it was established that in conditions of insufficient moisture supply (aridity of 30% PV) during the flowering phase, the total leaf area of winter wheat varieties and lines varied from 45.2 cm2 (“Volny Don”) to 63.4 cm2 (“Kazachka”), and in the phase of milky ripeness of grain, the total leaf area ranged from 3.5 cm2 (“260/09”) to 17.7 cm2 (“Polina”). The varieties “Krasa Dona”, “Kapitan”, “Lidiya”, “Asket” showed the best ratio of the upper leaves area to the lower ones under arid conditions (in favor of the upper ones in the flowering phase). In the phase of milky ripeness, the presence of lower green leaves was identified in the varieties “Kapitan”, “Krasa Dona”, “Izyumnka”. The amount of accumulated pigments (chlorophyll) in the leaves remains the highest during the flowering period and the milky ripeness of the grain in the varieties “Kapitan” (3.1 and 2.6 m/100g of dry matter), “Kazachka” (2.9 and 2.4 mg/100g of dry matter), “Krasa Dona” (2.8 and 2.4 mg/100g of dry matter), “Asket” (2.7 and 2.3 mg/100g of dry matter), “Lidiya” (2.6 and 2.4 mg/100g of dry matter), “Izyumnka” (2.5 and 2.1 mg/100g of dry matter)

Fluctuations of ice cover and sea water pressure nearby the Tunabreen Glacier front at Spitsbergen

Results of oceanographic measurements carried out in February, 2011, from the sea ice surface in the Tempelfjorden near the Tunabreen front in Svalbard are presented. Two temperature and pressure recorders SBE-39 were deployed on a wire from the ice approximately 300 m from the glacier front. The sampling time interval was 1 s. A pressure recorder SBE-37 was located under them on the bottom with a sampling interval of 6 s. Pressure oscillations on the bottom with a period of 90 s and ice cover oscillations with periods of 10 s and 14 s were recorded. The conclusion is made that the recorded oscillations of pressure in the sea water are related to the glacier microsurges, and the observed profiles of temperature, density, and salinity show the absence or insignificant inflow of fresh water from the glacier in the fjord during the winter season. The measurements allowed us to estimate the Young's modulus of the ice