综合数字区域模型和大范围有机废弃产品处理的测试系统的开发     

Sergey Polyansky Mikhail Sykhanov Vladimir Tikunov 《地球信息科学学报》2007,9(1):73-77

综合数字区域模型在区域可持续发展的任何模型实现中都是不可或缺的,而空间数据基础设施为综合数字区域模型提供了一个可靠的基础。其可以很方便地在地图信息或者直接在地理信息系统(GIS)内形成。这种GIS系统具有开发良好的模型函数,能够集成专家系统,也能被设计全尺度多媒体产品。GIS允许集成不同的信息资源、模型、可视化和分析、各种假设的详尽细节和为诸如自然-社会-经济等的复杂系统提供可选开发方案。一个综合辅助信息系统的结构包括紧密相关的社会-政治、经济(或生产)、自然资源和环境模块。它提供了对于不同区域范围社会生态系统的全面描述,显示了自然和人类资源的重要性。人们在这个研究领域将会谈及自然和社会管理。根据它们的变化层次体系(从全局范围到局部范围)可以描述所有专题,并且考虑在不同尺度上描述的现象的专业特征。超媒体系统原理可以通过链接集成主题来实现。这种系统的日益复杂性使得系统的智能化成为必要,专家系统和神经元网络可以从很复杂并且非常模糊的问题中得出可行的解决方案。现代GIS配有很多设备,对用户来说,这使得用基础地图和互联网获取必要的数据来编制专题图成为可能。数学建模的专业方法具有特殊的重要性,特别是那些旨在追求在区域变换到可持续发展模型时设想的详尽细节的方法。最高级的AIS能作为全尺度的决策支持系统使用。莫斯科国立大学试图实现上述思想,开发了俄罗斯可持续发展信息系统框架,特以俄罗斯南部地区为一案例。该示例一方面作为更大区域即国家的一部分进行描述,另一方面作为一个或多或少、基于资源发展的单元进行描述。也能对区域发展战略和改革措施提出建议。我们已经对所有俄罗斯地区进行了分类,并且指出了不同组(工业、农业等)的最典型代表。将精心设计几个系统的区域分支来描述整个国家的不同地域类型。计算机辅助信息系统提供用户以各种各样传统地图集的计算机的模拟,为决策者对未来的设计和区域发展变量评估等创造了条件。我们正在开发一个大范围有机废弃产品处理的测试GIS系统。其主要目标是为在废弃物储存和掩埋场所的生物降解进行方法研究。其应用包括:存放生活和工业废品的场所的使用和改进(包括工业和农业的场所和废品产生的地方);污水处理设备的建设和重建等。  相似文献   

The Chelyabinsk meteorite: New insights from a comprehensive electron microscopy and Raman spectroscopy study with evidence for graphite in olivine of ordinary chondrites     

David Kaeter  Martin A. Ziemann  Ute Böttger  Iris Weber  Lutz Hecht  Sergey A. Voropaev  Alexander V. Korochantsev  Andrey V. Kocherov 《Meteoritics & planetary science》2018,53(3):416-432

We present results of petrographic, mineralogical, and chemical investigations of three Chelyabinsk meteorite fragments. Three distinct lithologies were identified: light S3 LL5, dark S4–S5 LL5 material, and opaque fine-grained former impact melt. Olivine–spinel thermometry revealed an equilibration temperature of 703 ± 23 °C for the light lithology. All plagioclase seems to be secondary, showing neither shock-induced fractures nor sulfide-metal veinlets. Feldspathic glass can be observed showing features of extensive melting and, in the dark lithology, as maskelynite, lacking melt features and retaining grain boundaries of former plagioclase. Olivine of the dark lithology shows planar deformation features. Impact melt is dominated by Mg-rich olivine and resembles whole-rock melt. Melt veins (<2 mm) are connected to narrower veinlets. Melt vein textures are similar to pegmatite textures showing chilled margins, a zone of inward-grown elongated crystals and central vugs, suggesting crystallization from supercooled melt. Sulfide-metal droplets indicate liquid immiscibility of both silicate and sulfide as well as sulfide and metal melts. Impact melting may have been an important factor for differentiation of primitive planetary bodies. Graphite associated with micrometer-sized melt inclusions in primary olivine was detected by Raman mapping. Carbon isotopic studies of graphite could be applied to test a possible presolar origin.  相似文献   

Investigation of radio pulsar emission features using power spectra     

Valery M.Malofeev  Sergey A.Tyul'bashev 《天文和天体物理学研究(英文版)》2018,(8)

Since 2013, round-the-clock monitoring of the sky has been carried out simultaneously in 96 beams using a high-sensitivity radio telescope called the Large Phased Array(LPA) at the frequency110.25 MHz. These observations are made under the program of interplanetary plasma investigation.The same data are used to search for pulsars by means of power spectra. To increase the sensitivity of the pulsar search, 500–600 power spectra corresponding to different days of observations are summed. In the integrated spectra of known pulsars, besides expected improvement in signal-to-noise(S/N) ratio for the frequency harmonics, some features are explored in this paper. We present the 27 strongest pulsars which are in a field with declination 21°-42°. The observable details in the integrated power spectra are connected with the presence of pulsar periods of the second(P_2) and third(P_3) class, which have been identified. Empirical relations for calculating these periods are obtained. The value P_2 is estimated for 26 pulsars, and for 15 sources it is made for the first time. The value P_3 is estimated for 13 pulsars,among them these values are given for five sources for the first time.  相似文献   

Dynamics of magnetic flux tubes and IR-variability of young stellar objects     

Sergey Khaibrakhmanov  Alexander Dudorov  Andrey Sobolev 《天文和天体物理学研究(英文版)》2018,(8)

We simulate the dynamics of slender magnetic flux tubes(MFTs) in the accretion disks of T Tauri stars. The dynamical equations of our model take into account aerodynamic and turbulent drag forces, and the radiative heat exchange between the MFT and ambient gas. The structure of the disk is calculated with the help of our MHD model of the accretion disks. We consider the MFTs formed at distances of 0.027-0.8 au from the star with various initial radii and plasma betas β_0. The simulations show that MFTs with a weak magnetic field(β_0= 10) rise slowly with speeds less than the speed of sound. MFTs with β_0= 1 form an outflowing magnetized corona above the disk. Strongly magnetized MFTs(β_0= 0.1) can cause outflows with velocities 20-50 km s~(-1). The tubes rise periodically over times from several days to several months according to our simulations. We propose that periodically rising MFTs can absorb stellar radiation and contribute to the IR-variability of young stellar objects.  相似文献   

Laboratory Modeling of Aftershock Sequences: Stress Dependences of the Omori and Gutenberg–Richter Parameters     

Smirnov  V. B.  Ponomarev  A. V.  Stanchits  S. A.  Potanina  M. G.  Patonin  A. V.  Dresen  G.  Narteau  C.  Bernard  P.  Stroganova  S. M. 《Izvestiya Physics of the Solid Earth》2019,55(1):124-137

Izvestiya, Physics of the Solid Earth - Laboratory experiments on studying the aftershock regime are carried out on sandstone specimens at different levels of axial loading and uniform compression...  相似文献   

Coordinated monitoring of the eccentric O-star binary Iota Orionis: the X-ray analysis   总被引：1，自引：0，他引：1  

Julian M. Pittard  Ian R. Stevens  Michael F. Corcoran  Ken G. Gayley  Sergey V. Marchenko  Gregor Rauw † 《Monthly notices of the Royal Astronomical Society》2000,319(1):137-153

  相似文献   

GNSS Software Receivers     

Sergey S. Pospelov  Andrey L. Botchkovski  Peter A. Krauss  Stefan Berberich 《GPS Solutions》2000,4(1):48-55

Software Global Navigation Satellite Systems (GNSS) receivers are those that implement signal correlation processing not in hardware, but in their software. The main problem for the development of real-time software (SW) multichannel GNSS receivers is the tremendous amount of calculations to perform signal correlation. The article reviews recent developments of SW GNSS receivers. The emphasis is made on the computationally effective correlation processing algorithms and the optimization of processing allocation to the receiver's hardware (HW) and SW. An architecture is suggested that implements the PRN signals despreading in a special HW preprocessor while all the other correlation processing functions are still kept in SW. The combination of the most time-consuming processing in HW, and all signal structure-dependent processing in SW, enables unique flexibility of sophisticated GNSS receiver design based on inexpensive digital signal processors. ? 2000 John Wiley & Sons, Inc.  相似文献   

Geophysical Hazard for Human Health in the Circumpolar Auroral Belt: Evidence of a Relationship between Heart Rate Variation and Electromagnetic Disturbances     

Chernouss  Sergey  Vinogradov  Antoly  Vlassova  Elvira 《Natural Hazards》2001,23(2-3):121-135

Geomagnetic storms are a natural hazard tohuman health in the Auroral Belt of the Circumpolar.Geomagnetic disturbances in space, and the associated short-term variations in the atmosphere and the geophysical environment,provoke a disturbance of nervous and cardiovascular systems in the human body. The Heart Rate Variability (HRV) method providesa momentary response of human organisms toshort-term geophysical perturbations related to the Polar Aurora. A pilot project was performed in the Murmansk region in 1997–1999 with a contemporaneous series of records for both HRV in a test group of local inhabitants and the variations of natural geomagnetic fields.A correlation between geomagnetic disturbances and heart rate was calculated and different reactions of people on geophysical impact were shown. The special group of `Aurora Disturbance Sensitive People' (ADSP) was revealed. Aninternational study, aimed atevaluation of the impact on human health due to exposure of northern populations to the geophysical risk factor (GRF) in the Circumpolar areas located under the Aurora Belt, is needed.  相似文献   

The fifth-order analytical solution of the equations of motion of a satellite in orbit around a non-spherical planet     

Sergey M. Kudryavtsev 《Celestial Mechanics and Dynamical Astronomy》1995,61(3):207-215

A high-precise analytical theory of a satellite in orbit around a non-spherical planet has been developed. The Poisson's small parameter method has been used. All secular and short-periodic perturbations proportional up to and including a product of five arbitrary harmonic coefficients of the planetary potential expansion are calculated. Long-periodic perturbations are derived with the accuracy of up to the fourth-order, inclusive. The influence of the high-order perturbations on the motion of ETALON-1 satellite has been investigated. The results of comparison of the numerical and analytical integration of the equations of its motion over a five year interval are as follows:

–	- the r.m.s. difference between the positions is 1.1 cm;
–	- the r.m.s. difference between the ranges is 0.5 cm.

The theory is intended to be used for processing precise laser range measurements of the Earth geodynamical satellites over long-term intervals.  相似文献   

Statistical description of the Black Sea near-surface circulation using drifters in 1999–2003     

Pierre-Marie Poulain  Riccardo Barbanti  Sergey Motyzhev  Andrei Zatsepin 《Deep Sea Research Part I: Oceanographic Research Papers》2005,52(12):2250-2274

The near-surface circulation in the Black Sea is studied with the data of 54 satellite-tracked drifters in the period 1999–2003. The drifter trajectories confirm the prevalence of the Rim Current trapped on the continental slope (between water depths of 400 and 1800 m) along the periphery of the basin where sub-inertial speeds can reach 1 m/s. Some drifters were found to complete an entire basin loop with the Rim Current in 90–180 days. Meanders and loops in the tracks prove the existence of mostly anticyclonic circulation features inshore of the Rim Current, including strong signatures of the Batumi and Sevastopol eddies. They also reveal the presence of cyclonic and anticyclonic currents in most areas of the Black Sea. Pseudo-Eulerian statistics (averaged in 50-km bins), that is, mean currents and the corresponding velocity variances, show a strong and highly fluctuating signature of the Rim Current and the enhanced variability associated with the Batumi and Sevastopol eddies. The latter is also collocated with the branching of the Rim Current southwest of the Crimean Peninsula. It is shown that the kinetic energy is mainly in the mean for the Rim Current and in the velocity fluctuations elsewhere. Seasonal variability is also explored. The Rim Current tends to form a stronger single loop trapped on the continental slope in winter/spring, whereas in summer/fall the mean circulation is more meandering, recirculation cells appear in the central areas and the bifurcation southwest of Crimea is enhanced. There is some evidence of the reversal of sense of rotation of the currents in the Batumi Eddy region, changing from mainly anticyclonic in summer/fall to cyclonic in winter/spring. Mean residence times were calculated in the 50-km bins, with values ranging from a few days in the central basin to 8 days in the northwestern coastal area. Globally, the kinetic energy levels were found higher in winter–spring and lower in summer–fall, with a significant maximum in March. Single-particle Lagrangian statistics were computed for the entire basin, for the two extended seasons, and in selected local areas. Velocity variance, diffusivity and Lagrangian integral time scales are generally larger in the zonal direction. Globally, the velocity variance is 174 and 127 cm²/s² in the zonal and meridional directions, respectively, after the removal of the pseudo-Eulerian mean circulation. For the zonal direction, a diffusivity value of 4.5×10⁷ cm²/s and Lagrangian integral time and space scales of 3 days and 34 km were found. For the meridional direction, these statistics amount to 4.5×10⁷ cm²/s, 1.2 days and 12.2 km. Seasonal and geographical variations of these Lagrangian statistics were also assessed, showing variations between 1.9 (0.9) 10⁷ and 8.3 (2.0) 10⁷ cm²/s for the diffusivity in the zonal (meridional) direction. Integral time and space scales vary between 1 and 4.7 days, and 8.8 and 58 km, respectively. Seasonal differences are significant only in the zonal direction, where the diffusivity increases from 3.1×10⁷ to 5.9×10⁷ cm²/s and the integral scales vary from 2.1 days (24 km) to 3.8 days (44 km) from summer/fall to winter/spring.  相似文献