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排序方式: 共有382条查询结果,搜索用时 218 毫秒
51.
M Casolino V Bidoli E De Grandis M P De Pascale G Furano A Morselli L Narici P Picozza E Reali R Sparvoli A Galper M Korotkov Y Ozerov A Popov G Mazzenga M Ricci G Castellini S Avdeev M Boezio W Bonvicini A Vacchi N Zampa P Spillantini P Carlson C Fuglesang 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2003,31(1):135-140
In this work we present preliminary results of nuclear composition measurements on board space station MIR obtained with SILEYE-2 particle telescope. SILEYE-2 was placed on MIR in 1997 and has been working since then. It consists of an array of 6 active silicon strip detectors which allow nuclear and energetic identification of cosmic rays in the energy range between approximately 30 and 200 MeV/n. The device is attached to an helmet and connected to an eye mask which shields the cosmonaut eyes from light and allow studies of the Light Flashes (LF) phenomenon. In addition to the study of the causes of LF, the device is used to perform real time long term radiation environment monitoring inside the MIR, performing measurements in solar quiet and active days. 相似文献
52.
Massimo Materassi Lucilla Alfonsi Giorgiana De Franceschi Vincenzo Romano Cathryn Mitchell Paolo Spalla 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2009
The study of amplitude scintillation on GPS radio links is usually done after detrending the time series of the transmitted power so to define scintillations as the chaotic fluctuation around a unitary value. In a sense, the choice of how to detrend the time series is part of the definition of scintillation. 相似文献
53.
Giuseppe Consolini Paola De Michelis Matthieu Kretzschmar 《Space Science Reviews》2006,122(1-4):293-299
Recent studies evidenced that the magnetotail dynamics looks like the one of an avalanching system. This fact has been related
with a near criticality dynamics and modelled by singular diffusion and transport equations. Here, we discuss some features
of the Earth’s magnetotail dynamics using a thermodynamic approach. In detail we discuss the role played by fluctuations in
singular diffusion and relaxation processes from a non-equilibrium thermodynamics point of view. Moreover, the emergence of
non-Gaussian statistics is discussed in the framework of the thermodynamics of composite systems. 相似文献
54.
H. Van De Stadt 《Space Science Reviews》1975,17(5):673-676
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In part I (De Greve and Packet) we have investigated the occurrence of reversed phases of mass-transfer during Case A evolution in close binaries. If the initial period of a system is shorter than 1–2 days (Early Case A) the reversed phase starts before core hydrogen exhaustion of the gainer (part I). This type of evolution is characterized by at least two phases of slow mass-transfer.We have computed the evolution of four Early Case A systems with initial masses of the loser equal to 3 Mo and 5 Mo. These four systems start mass-exchange when Xc of the primary has decreased to 0.525 (75% of its initial value). They all experience two phases of slow mass-transfer.We find that both phases have about the same duration for all systems. The mass ratios are clearly distinct, being closer to unity during the first phase. In the Hertzsprung-Russell, mass-radius and mass-luminosity diagrams both components remain close to the main-sequence band during slow mass-transfer. Evolution as an Algol is ended when both components overflow their outer critical surface after a second reversal of the mass-transfer.Observed Algol systems evolving in Early Case A are scarce. A search thruogh the catalogue by Giuricin et al. gives us the following candidates: X Tri, SX Aur and V Pup. Based on their mass ratios, SX Aur can tentatively be assigned to the first phase of slow mass transfer and X Tri to the second phase. For V Pup (which is more massive) this choice can not be made with certainty. 相似文献
57.
L. D. De Feiter 《Space Science Reviews》1972,13(4-6):827-842
Recent observations of the energetic particles produced in solar flares indicate that the production of electrons, with energies up to about 100 keV, is a fairly common feature of small flares. In those flares the acceleration of protons and other nuclei does not extend beyond about 1 MeV.The X-ray emission often exhibits two distinct components of which the first one is produced by non-thermal, the second by thermal electrons through bremsstrahlung collisions with the ambient ions. Along with these X rays, radio emission, in the microwave region, is observed. This radio emission is usually interpreted as due to gyrosynchrotron radiation from the same electrons.In this review a discussion is presented of the processes occurring in solar flares with special reference to the acceleration and radiation processes. 相似文献
58.
The contribution of the canonical Quasars to the XRB 2–50 keV is not likely to exceed 50%. Nay, consideration of X-ray selection effects results in a further reduction of the value of sensible estimators for the intensity ratio LX/LO; in addition, recent counts of radioloud and radio-quiet Quasars definitely limit the number of faint sources. A missing component with definite spectral properties should comprise a sizeable fraction of the XRB. 相似文献
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60.
针对深空测控通信中GMSK体制非相干解调损失较大的难点,提出了一种改进的GMSK信号非相干维特比解调算法。通过分析相位状态网格图中相位转移规律,建立理论仿真模型。通过原理样机的研制和测试,实测数据表明:该算法具有解调损失低、实现复杂度适中的优点;相比于理论的最佳相干解调算法,在误码率1×10 -4 量级下,实测仅损失0.6 dB。目前该算法已应用于国内某深空测控通信系统GMSK体制基带设备中,并成功解调出欧空局Herschel–Planck卫星数据。 相似文献