40 research outputs found
MODELING OF SATELLITE COMMUNICATION LINKS WITH ORTHOGONAL FREQUENCY-DIVISION MULTIPLEXING
No full textMODELING OF SATELLITE COMMUNICATION LINKS WITH ORTHOGONAL FREQUENCY-DIVISION MULTIPLEXING / Kharchenko V.P., Wang Bo, Grekhov A.M., Leschenko A.M. // Transport. – 2016. – V.31. – №1. – P. 22–28.Global technologies of data transmission in real time are developing constantly. Therefore modeling of messages transmission through satellite constellations is an actual problem. In this paper the original model of a communication channel "Vehicle-to-Satellite-to-Ground Station" based on principles of the IEEE 802.11a standard is designed using MATLABSіmulіnk software. The model allows simulating data transmission with data rate from 6 to 54 Mbit/s using adaptive modulation. For uplink/downlink two types of channels were analyzed - a free space path losses with phase/frequency offset and AWGN link. On the base of this model channel integrity was investigated and dependences of a signal-noiseratio (SNR) on free space path losses, antennas diameters, number of OFDM symbols and satellite transponder noise temperature were received
MODELING OF SATELLITE COMMUNICATION LINKS WITH ORTHOGONAL FREQUENCY-DIVISION MULTIPLEXING
No full textMODELING OF SATELLITE COMMUNICATION LINKS WITH ORTHOGONAL FREQUENCY-DIVISION MULTIPLEXING / Kharchenko V.P., Wang Bo, Grekhov A.M., Leschenko A.M. // Transport. – 2016. – V.31. – №1. – P. 22–28.Global technologies of data transmission in real time are developing constantly. Therefore modeling of messages transmission through satellite constellations is an actual problem. In this paper the original model of a communication channel "Vehicle-to-Satellite-to-Ground Station" based on principles of the IEEE 802.11a standard is designed using MATLABSіmulіnk software. The model allows simulating data transmission with data rate from 6 to 54 Mbit/s using adaptive modulation. For uplink/downlink two types of channels were analyzed - a free space path losses with phase/frequency offset and AWGN link. On the base of this model channel integrity was investigated and dependences of a signal-noiseratio (SNR) on free space path losses, antennas diameters, number of OFDM symbols and satellite transponder noise temperature were received
Research notes: The frequency of chlorophyll mutations in soybeans
No full textThe first mutations of soybeans in the USSR were received by Leschenko A. in the 30's. In the late 50's, through direct selection of mutations, the first variety called 'Universal 1' was received in the USSR. The second strain-- 'Wonder of Georgia' --was received through crossing of induced mutants of soybeans.</p
Rezul'taty ehksperimental'nykh issledovanijj shelushil'no-shlifoval'nojj mashiny dlja zerna
No full textActivity and epigenetic determinants of sensitivity to temozolomide in diffuse large B cell lymphoma
No full textGASTROESOPHAGEAL REFLUX: NEW THERAPEUTIC PROSPECTS
No full textThe article provides the data of epidemiologic studies on frequency of symptoms of the gastroesophageal reflux disease (GERD), risk factors and GERD manifestations. Special emphasis is made on the individual therapeutic approach and choice of the modern effective drug for therapy – PPI Dexlansoprazol
Regional integration in Central Asia: A firm-centered view
No full textRegional integration remains among the main topics of international discourse in Central Asia, though the progress of international cooperation is very limited. Our aim is to understand the connection between the organization of economic institutions in Central Asia and the regional integration. The existing literature has explored the state level of integration in great detail: varying from rational choice explanations of security dilemma to the studies of social construction of the region in Central Asia. This paper, however, provides a firm-centered perspective on the regional integration. Thus, it first considers how varieties of political economies of Central Asian countries influence the regionalization process in the region through economic networks established by private actors, and how institutions are shaped by regionalization. Second, it considers how political institutions determine the impact of informal networks on formal regional integration initiatives, and looks at the potential effect of formal regionalism on regionalization process in Central Asia.Regionalization, informal integration, transition
MEASUREMENT OF VIBRATION PARAMETERS OF SIS PIPELINES REACTOR BASED ON RBMK-1000 AT 1-ST BLOCK SMOLENSKAYA NPP
No full text
Експериментальна оцінка ефективності основного обробітку ґрунту чизельними знаряддями в умовах переущільнення
No full textThe work discloses experimental estimates of the efficiency of basic boardless tilling by chisel equipment
in the conditions of considerable compaction of the plough layer. The factors that prove expediency of soil
chiselling and the outcomes of introduction into technological growing processes of this resource saving tilling
were presented. The design of chisel blade with vertical and horizontal deformators was suggested. The results of
experimental research of the designed chisel showed influence of speed parameters and a set of additional working
organs on the indicators of soil grinding were given. Робота присвячена експериментальній оцінці ефективності основного безвідвального обробітку
ґрунту чизельними знаряддями в умовах значного переущільнення орного горизонту. Наведені фактори,
що доводять доцільність проведення чизелювання ґрунтів та наслідки впровадження в технологічні
процеси вирощування цього ресурсозберігаючого способу основного обробітку. Запропоновано
конструкцію чизельної лапи з вертикальними та горизонтальними деформаторами. Приведені результати
експериментальних досліджень розробленого чизеля в ході яких встановлено вплив швидкісних
параметрів та набору додаткових робочих органів на якісні показники подрібнення ґрунту
