Macromolecules in the galaxy and the cosmic microwave background     

Yu. N. Pariiskii  N. N. Bursov  A. B. Berlin  N. A. Nizhel’skii  A. V. Bogdantsov  P. A. Tsybulev 《Astronomy Reports》2002,46(7):525-530

A deep search for the predicted Galactic microwave dipole emission of spinning interstellar fullerene-type molecules has been conducted using the RATAN-600 radio telescope. This effect is of interest both in its own right and as a new form of Galactic screen between the cosmic microwave background (CMB) and the observer. The power of this noise component on angular scales of about 0.1° (l=1000) is estimated. These scales are of primary interest for the “Cosmological Gene of the Universe” (RATAN-600), PLANCK Surveyor Mission, and other projects. At the frequencies of the expected emission peak of this dust component, the small-scale noise is a factor of 20 weaker than the predicted noise. It is shown that the role of this dust component is negligible, at least at the main PLANCK frequencies. The first estimates of the contribution from Galactic polarization noise are given for λ=3.9 cm, where the theory predicts a maximum in the CMB polarization (l～1000). At wavelengths of ～1 cm and shorter, macromolecules contribute less than 1 µK, and should not hinder CMB polarization studies. Galactic synchrotron polarization, likewise, should not prevent CMB polarization experiments at the main PLANCK frequencies.  相似文献   

Identification and alleviation pathways of multidimensional poverty and relative poverty in counties of China   总被引：1，自引：1，他引：0  

XU Lidan  DENG Xiangzheng  JIANG Qun'ou  MA Fengkui 《地理学报(英文版)》2021,31(12):1715-1736

To realize efficient and sustainable poverty alleviation,this study firstly investigated the identification of multidimensional poverty and relative poverty,and then explored relevant poverty alleviation pathways.Poverty levels in 31 provinces including the autonomous re-gions and municipalities of China were identified at the county level using the average nighttime light index (ANLI),county multidimensional development index (CMDI),and a method combining multidimensional poverty index and relative poverty standards.Poverty alleviation pathways for poverty-stricken counties were explored from the aspects of industry,education,tourism and agriculture.The results revealed that nearly 60％ of counties in China were primarily under relative poverty,most of which were corresponded to light relative pov-erty.In terms of ANLI and CMDI,63％ and 79％ of the national poverty-stricken counties,as of 2018,could be identified,suggesting that CMDI had a higher performance for identifying poverty at the county level.In terms of poverty alleviation pathways,414,172,442,and 298 poverty-stricken counties were receptive to industry poverty alleviation,education poverty alleviation,tourism poverty alleviation,and agriculture poverty alleviation,and 61％ of coun-ties had more poverty-causing factors,implying that multidimensional poverty alleviation is suitable in most of the counties.  相似文献   

Apatite fission track and (U-Th)/He thermochronology of the Rochovce granite (Slovakia) – implications for the thermal evolution of the Western Carpathian-Pannonian region     

Martin Danišík  Milan Kohút  István Dunkl  L’ubomír Hraško  Wolfgang Frisch 《Swiss Journal of Geoscience》2008,101(1):225-233

The thermal evolution of the only known Alpine (Cretaceous) granite in the Western Carpathians (Rochovce granite) is studied by low-temperature thermochronological methods. Our apatite fission track and apatite (U-Th)/He ages range from 17.5 ± 1.1 to 12.9 ± 0.9 Ma, and 12.9 ± 1.8 to 11.3 ± 0.8 Ma, respectively. The data thus show that the Rochovce granite records a thermal event in the Middle to early Late Miocene, which was likely related to mantle upwelling, volcanic activity, and increased heat flow. During the thermal maximum between ~17 and 8 Ma, the granite was heated to temperatures ? 60 °C. Increase of cooling rates at ~12 Ma recorded by the apatic fission track and (U-Th)/He data is primarily related to the cessation of the heating event and relaxation of the isotherms associated with the termination of the Neogene volcanic activity. This contradicts the accepted concept, which stipulates that the internal parts of the Western Carpathians were not thermally affected during the Cenozoic period. The Miocene thermal event was not restricted to the investigated part of the Western Carpathians, but had regional character and affected several basement areas in the Western Carpathians, the Pannonian basin and the margin of the Eastern Alps.  相似文献   

Distribution of heavy metals in an incineration system of solid wastes in the Three-Gorges region of the Yangtze River   总被引：1，自引：1，他引：0  

HUANG Chuan WANG Li＇ ao CHEN Gangcai LUO Yu ZHANG Jun CUI Zhiqiang 《中国地球化学学报》2008,27(2):189-193

On the basis of investigations on the composition and contents of heavy metals in the domestic refuse in the Three-Gorges region of the Yangtze River, in combination with the experimental results, this paper deals with the distribution rule of heavy metals in the various compartments of an incineration system： leachate pool, fly ash and residue. It is concluded that in the leachate pool heavy metals should not be neglectable since about 30% of Pb and 10% of Cr are leached here; in the incineration system, above 74% of Cr, As and Pb exists in residue; above 96% of Hg exists in fly ash and the contents of Cd in fly ash are close to those of residue. It is also concluded that the physical conditions of incineration have a significant influence on the distribution of heavy metals in the incineration system.  相似文献   

A Systematic Review of the Socioeconomic Factors that Influence How Marine Protected Areas Impact on Ecosystems and Livelihoods     

Me’ira Mizrahi  Amy Diedrich  Rebecca Weeks  Robert L Pressey 《社会与自然资源》2019,32(1):4-20

Marine protected areas (MPAs) are among the most widely accepted methods of marine management. MPAs are not, however, always placed such that they can maximize impact on conservation and livelihoods. Current MPA guidelines fall short in focusing primarily on biophysical criteria, overlooking interrelated socioeconomic factors. We identified 32 socioeconomic factors that influence whether MPA placement has an impact on biodiversity and/or livelihoods and weighted the quality of evidence using a novel “Evidence for Impact” Score. Results suggest that stakeholder engagement, poverty, population density, and strong leadership have most potential to positively impact biodiversity and/or livelihoods, but the direction of impact (i.e., positive or negative) can be context-dependent. We found a generally poor evidence base for impact evaluation of socioeconomic factors: though some factors were highly cited, few studies actually evaluate impact. Results indicate the need for a more interdisciplinary approach to MPA placement and more empirical studies that assess impact.  相似文献   

支持向量分类机LIBSVM方法识别天然地震、爆破与塌陷   总被引：1，自引：0，他引：1  

范晓易  曲均浩  曲保安  刘方斌  山长仑  周少辉 《大地测量与地球动力学》2019,39(9):916-918

对天然地震、爆破及塌陷的波形数据进行小波变换,并用小波转换系数提取香农熵特征,采用支持向量分类机LIBSVM多类模式识别方法对香农熵特征进行分类识别,识别率在80%~95%之间。结果表明,采用LIBSVM对波形特征进行分类的方法可以较好地识别天然地震、爆破与塌陷。  相似文献   

基于高速公路流的东北大都市区边界识别与结构特征研究   总被引：2，自引：2，他引：0  

陈卓  金凤君  王姣娥 《地理科学》2019,39(6):929-937

利用高速公路收费站数据分析东北大都市区的空间边界与中心-外围结构特征。研究发现,① 中心城市高速公路流随距离的分布符合距离衰减规律,随规模位序的累积分布符合“二八定律”,但在具体的指标阈值上却表现出显著差异。② 四大都市区在空间上相连,以较小的国土面积承载了区域主要的社会经济活动。沈阳都市区和大连都市区在城镇关联体系中已实现融合;沈阳都市区、长春都市区、哈尔滨都市区间的空间联系则相对松散。③ 高速公路流空间下,各大都市区中心-外围空间结构表现出空间圈层、功能廊道和边界切割的典型特征。  相似文献   

Dynamics of Accumulative Coasts in Enclosed Bays of Antarctica (with an Example of the Key Area of the South Georgia Microcontinent)     

Dunaev  N. N.  Leont’yev  I. O. 《Oceanology》2019,59(2):242-246

Oceanology - The object of direct study is the accumulative coast of King Edward Bay on the island of South Georgia of the Antarctic microcontinent of the same name. Neotectonic uplift of the...  相似文献   

Rhythmic Patterns in the Shoreline Contour of the Gulf of Terpenya,Sakhalin Island     

Leont’yev  I. O.  Afanasiev  V. V.  Uba  A. V. 《Oceanology》2019,59(3):451-459

Oceanology - The paper considers the results of long-term observations of megacusp (large-scale shoreline cusps) on the coast of the Gulf of Terpenya (Gulf of Patience), Sakhalin Island. The...  相似文献   

Russian Studies of Atmospheric Electricity in 2015–2018     

Mareev  E. A.  Stasenko  V. N.  Shatalina  M. V.  Dement’eva  S. O.  Evtushenko  A. A.  Svechnikova  E. K.  Slyunyayev  N. N. 《Izvestiya Atmospheric and Oceanic Physics》2019,55(6):562-572

Izvestiya, Atmospheric and Oceanic Physics - The most significant results of Russian studies in the field of atmospheric electricity in 2015–2018 are reviewed. The review is a part of the...  相似文献