The choice of spectrum of LED irradiators affect the life of lighting systems in horticulture

The article presents the results of experimental studies of LED degradation in greenhouse irradiators for horticulture. It was found that in the process of operation of the irradiators the emission spectrum changes. This is caused by different decrease rate of photosynthetic photon flux of different colored LEDs. For a longer service life it is recommended to use greenhouse irradiators with a large proportion of red LEDs

Vertical thermal structure of the Venus atmosphere from temperature and pressure measurements

Accurate temperature and pressure measurements were made on the Vega-2 lander during its entire descent. The temperature and pressure at the surface were 733 K and 89.3 bar, respectively. A strong temperature inversion was found in the upper troposphere. Several layers with differing static stability were visible in the atmospheric structure

Adjacent channel co-existence study between 5G NR and Wi-Fi in the 6 GHz band for indoor scenario

Base stations (BS) radiation is the main source of electromagnetic background generated by mobile (cellular) communications. The known technique for estimating an average intensity of background generated by BS radiation takes into account the directivity of BS antennas in a simplified form, assuming that the width of the main lobe of the radiation pattern is equal to the width of BS servicing sector and not taking into account the radiation directivity in vertical plane. Noted simplifications determine too pessimistic nature of these estimations. The paper contains results of the refined analysis of this problem using a two-level models of antenna radiation patterns, which give the actual values of the width of antennas main lobe in horizontal and vertical planes, the relative levels of side lobes and the ratio of radiation power of the main and side lobes. The analysis was performed both for stationary sector antennas of cellular communication systems and for adaptive phased antenna arrays of 4G/5G systems capable of providing service using narrow beams. Obtained results reduce by 5-15 dB the degree of pessimism provided by known techniques in the estimation of the average levels of electromagnetic background created by BS radiations near the Earth's surface

Оценка потребности региона в человеческих ресурсах на основе анализа статистических данных и патентных ландшафтов

Переход России на новую технологическую платформу актуализирует проблему кадрового обеспечения по перспективным направлениям квалификации. Структурная трансформация экономики после пандемии ускорила изменения на рынке труда, выявив необходимость разработки новых методов прогнозирования с учетом приоритетов регионального технологического развития. Целью данного исследования является разработка новых подходов, основывающихся на структурированных и неструктурированных базах данных, для определения системы факторов формирования потребности в кадровом обеспечении. Потребности региона в человеческих ресурсах были спрогнозированы с использованием методик интеллектуального анализа данных и патентных ландшафтов. Такое прогнозирование учитывает экономическую направленность региона, а также его географическое положение, программу развития инвестиций и НИОКР, специфику рынка труда. Преимуществом предлагаемой методики является получение обоснованных оценок потребности региона в человеческих ресурсах методами интеллектуального анализа данных и патентных ландшафтов в условиях недостатка официальных статистических данных. База исследования включает более 25 миллионов записей: полнотекстовые коллекции российских и зарубежных патентов, научные работы, статистические показатели и т. д. Анализ ситуации в Вологодской области выявил перспективные направления подготовки, привлекательные для квалифицированных кадров и соответствующие приоритетам регионального технологического развития. В дальнейшем планируется совершенствование методики количественной оценки региональной потребности в специалистах отдельных отраслей. Полученные результаты могут быть использованы государственными органами и исследовательскими центрами при разработке региональных стратегий

Study of the emotional state of the offspring of rats treated with aqueous plant extracts

The influence of biologically active compounds on the functional state of the central nervous system and the emotional component in rats can be evaluated by using behavioral methods, which are based on studying the exploratory behavior of animals in an environment new to them. One such method is the study of animal behavior in an elevated cross-shaped maze with open and closed arms and the Porsolt "despair" test. The aim of our study was to investigate the emotional state of the offspring of rats treated with aqueous plant extracts of Centella asiatica, Ginkgo biloba, Eleuterococcus and a mixture of aqueous extracts of Centella asiatica and Ginkgo biloba. The study of the emotional state of the offspring of rats treated with aqueous plant extracts was performed on 3 month old animals obtained in the experiment from males (20 animals) and females (50 animals), which received aqueous plant extracts at a dose of 30 mg/100 g of the animal body weight, in the volume of 1 ml for 30 days. Conclusions: Aqueous extracts of Centella asiatica, Ginkgo biloba and Eleutherococcus have pronounced nootropic activity, as the evaluation of animal anxiety level in the Elevated Cross Maze test and depression level in the Porsolt Despair Behavior test show a significant difference in the behavior of intact rats and offspring rats, receiving aqueous plant extracts as an additional load and the most pronounced effect is observed with the complex application of extracts of Centella asiatica and Ginkgo biloba