Advances in Astronomy最新文献_第10页

Relations between the Spectral Indices and Flux Densities of Eight Blazars 八种Blazar的光谱指数与通量密度的关系

IF 1.4 4区物理与天体物理

Advances in Astronomy Pub Date : 2019-05-02 DOI: 10.1155/2019/8041087

Yu-hai Yuan

引用次数: 0

Oscillating Cosmological Solutions in the Modified Theory of Induced Gravity 修正诱导引力理论中的振荡宇宙学解

IF 1.4 4区物理与天体物理

Advances in Astronomy Pub Date : 2019-04-24 DOI: 10.1155/2019/1502453

F. Zaripov

{"title":"Oscillating Cosmological Solutions in the Modified Theory of Induced Gravity","authors":"F. Zaripov","doi":"10.1155/2019/1502453","DOIUrl":"https://doi.org/10.1155/2019/1502453","url":null,"abstract":"This work is the extension of author’s research, where the modified theory of induced gravity (MTIG) is proposed. In the framework of the MTIG, the mechanism of phase transitions and the description of multiphase behavior of the cosmological scenario are proposed. The theory describes two systems (stages): Einstein (ES) and “restructuring” (RS). This process resembles the phenomenon of a phase transition, where different phases (Einstein’s gravitational systems, but with different constants) pass into each other. The hypothesis that such transitions are random and lead to stochastic behavior of cosmological parameters is considered. In our model, effective gravitational and cosmological “constants” arise, which are defined by the “mean square” of the scalar fields. These parameters can be compared with observations related to the phenomenon of dark energy. The aim of the work is to solve equations of MTIG for the case of a quadratic potential and compare them with observational cosmology data. The interaction of fundamental scalar fields and matter in the form of an ideal fluid is introduced and investigated. For the case of Friedmann-Robertson-Walker space-time, numerical solutions of nonlinear MTIG equations are obtained using the qualitative theory of dynamical systems and mathematical computer programs. For the case of a linear potential, examples joining of solutions, the ES and RS stages, of the evolution of the cosmological model are given. It is shown that the values of such parameters as “Hubble parameter” and gravitational and cosmological “constants” in the RS stage contain solutions oscillating near monotonically developing averages or have stochastic behavior due to random transitions to different stages (RS or ES). Such a stochastic behavior might be at the origin of the tension between CMB measurements of the value of the Hubble parameter today and its local measurements.","PeriodicalId":48962,"journal":{"name":"Advances in Astronomy","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2019/1502453","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42768132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Study of Chang’E-2 Microwave Radiometer Data in the Lunar Polar Region 嫦娥二号月球极区微波辐射计数据研究

IF 1.4 4区物理与天体物理

Advances in Astronomy Pub Date : 2019-04-24 DOI: 10.1155/2019/3940837

Fan Yang, Yi Xu, K. Chan, Xiaoping Zhang, G. Hu, Yong Li

{"title":"Study of Chang’E-2 Microwave Radiometer Data in the Lunar Polar Region","authors":"Fan Yang, Yi Xu, K. Chan, Xiaoping Zhang, G. Hu, Yong Li","doi":"10.1155/2019/3940837","DOIUrl":"https://doi.org/10.1155/2019/3940837","url":null,"abstract":"The Chang’E-2 (CE-2) four-channel microwave radiometer (MRM) data with frequencies of 3 GHz, 7.8 GHz, 19.35 GHz, and 37 GHz have been used to investigate the properties of lunar surface such as regolith thickness, dielectric constant, and titanium abundance within a depth of several meters in middle and low latitudes. The purpose of this work is to take a close look at MRM data in the polar regions of the Moon and analyze the characteristics of the brightness temperature (TB) in permanently shadowed regions (PSRs), especially where evidence of water ice has been found. First, the comparisons of brightness temperature values in the polar region and in low latitudes show that (1) the periodic diurnal (day/night) variation of TB becomes weak in high latitudes since topography plays a dominant role in determining TB in polar region and (2) seasonal effects are more recognizable in polar region than in low latitudes due to the weak illumination condition. Second, even without direct sun illumination, significant seasonal variations of TBs are observed in PSRs, probably caused by the scattering flux from neighboring topography. TB Ratio (TBR) between channel 1 and channel 4, which indicates the differences of TB at different depths of lunar regolith, is higher and shows stronger seasonal variation in PSR than regions with direct illumination. Third, overall the distribution of high TBR values is in consistence with the water ice distributions obtained by the Moon Mineralogy Mapper instrument, the LAMP UV spectra, and the Lunar Prospector Neutron Spectrometer. The proportion of the summation over area with water ice proof in the regions of interest is 0.89 and 0.56 in south pole and north pole, respectively. The causes of the correlation of high TBR between different microwave frequencies and stability of water ice deposits still require further investigation, but MRM data shows unique characteristic in PSRs and could provide important information about the upper few meters of lunar regolith.","PeriodicalId":48962,"journal":{"name":"Advances in Astronomy","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2019/3940837","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45674319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Mass Transfer and Intrinsic Light Variability in the Contact Binary MT Cas 接触二元MT-Cas中的传质和本征光变率

IF 1.4 4区物理与天体物理

Advances in Astronomy Pub Date : 2019-04-04 DOI: 10.1155/2019/4593092

H. Dai, Huiyu Yuan, Yuangui Yang

引用次数: 1

Design and Implementation of Xinjiang Astronomical Observatory Astronomical Data Transmission Visualization System 新疆天文台天文数据传输可视化系统的设计与实现

IF 1.4 4区物理与天体物理

Advances in Astronomy Pub Date : 2019-04-02 DOI: 10.1155/2019/8741027

X. Ye, Hailong Zhang, Yan Zhu, Jie Wang, T. Ergesh, Huijuan Li

{"title":"Design and Implementation of Xinjiang Astronomical Observatory Astronomical Data Transmission Visualization System","authors":"X. Ye, Hailong Zhang, Yan Zhu, Jie Wang, T. Ergesh, Huijuan Li","doi":"10.1155/2019/8741027","DOIUrl":"https://doi.org/10.1155/2019/8741027","url":null,"abstract":"With the development of astronomical observation technology, astronomical devices produce more data than ever. Astronomical telescopes are usually far away from city, so the long-distance data transmission between telescope and data center faces great challenges. Visualization system of astronomical data transmission with four-layer structure was built to manage data transmission. This visualization system has a four-layer structure: hardware layer, system layer, middle layer, and visualization layer. System function includes automatic data transmission, log recording of transmission process, and display of the transmission status in dynamic web pages. Besides, the middle layer contains an alarm subsystem that can automatically send system exceptions to administrator. We also design corresponding mechanisms to ensure the high stability of the system and to control the data transmission when the network is unstable through adaptive algorithms. In test, this visualization system can run stably for a long time in unmanned manner. This system also provides a solution for the astronomical observation bases to automatically transmit data to the data center.","PeriodicalId":48962,"journal":{"name":"Advances in Astronomy","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2019/8741027","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41565164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

An Introduction to a New Space Debris Evolution Model: SOLEM 一种新的空间碎片演化模型:SOLEM

IF 1.4 4区物理与天体物理

Advances in Astronomy Pub Date : 2019-03-28 DOI: 10.1155/2019/2738276

Xiao-wei Wang, Jing Liu

引用次数: 9

Revisiting the Question: The Cause of the Solar Cycle Variation of Total Solar Irradiance 再谈问题:太阳总辐照度太阳周期变化的原因

IF 1.4 4区物理与天体物理

Advances in Astronomy Pub Date : 2019-03-26 DOI: 10.1155/2019/3641204

N. Xiang

{"title":"Revisiting the Question: The Cause of the Solar Cycle Variation of Total Solar Irradiance","authors":"N. Xiang","doi":"10.1155/2019/3641204","DOIUrl":"https://doi.org/10.1155/2019/3641204","url":null,"abstract":"The Mg II index and sunspot area are usually used to represent the intensification contribution by solar bright structures to total solar irradiance (TSI) and sunspot darkening, respectively. In order to understand the cause of the solar cycle variation of TSI, we use extension of wavelet transform, wavelet coherence (WTC), and partial wavelet coherence (PWC), to revisit this issue. The WTC of TSI with sunspot area shows that the two time series are very coherent on timescales of one solar cycle, but the PWC of TSI with sunspot area, which can find the results of WTC after eliminating the effect of the Mg II index, indicates that the solar cycle variation of TSI is not related to sunspots on the solar surface. The coherence of two time series at these timescales should be due to a particular phase relation between sunspots and TSI. The WTC and PWC of TSI with Mg II index show that the solar cycle variation of TSI is highly related to Mg II index, which reflects the relation of TSI with the long-term part of Mg II index that shows the intensification contribution by the small magnetic features to TSI. Consequently, the solar cycle variation of TSI is dominated by the small magnetic features on the solar full disk. Additionally, we also show the combined effects of the sunspot darkening and the intensification contribution represented by Mg II index to TSI on timescales of a few days to several months and indicate that the faculae increase TSI and contribute to its variation at these timescales.","PeriodicalId":48962,"journal":{"name":"Advances in Astronomy","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2019/3641204","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43544025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Anthropic Principle’s Predicting Symmetric Distribution Matter Strata, Their Physics Laws, and Verifications 人择原理预测物质层对称分布及其物理规律与验证

IF 1.4 4区物理与天体物理

Advances in Astronomy Pub Date : 2019-03-18 DOI: 10.1155/2019/2501417

Changyu Huang, Yongchang Huang

{"title":"Anthropic Principle’s Predicting Symmetric Distribution Matter Strata, Their Physics Laws, and Verifications","authors":"Changyu Huang, Yongchang Huang","doi":"10.1155/2019/2501417","DOIUrl":"https://doi.org/10.1155/2019/2501417","url":null,"abstract":"This paper shows anthropic principle’s predicting symmetric distribution matter strata, their physics laws, and verifications, concretely deduces characteristic time, energy, and temperature expressions at different scales, discovers four interesting invariant quantities, shows homeomorphic theorem of space map, and naturally presents a supersymmetric scale energy. We further discover that any infinitesimal space has the same proportional structure space; namely, they have renormalization group invariance. Consequently, this paper shows that the region of any nth level Plank-scope is from the nth level Planck scale to the (n+1)th level Planck scale, where the different matters of the nthlevel Planck scale build up the (n+1)th level Planck scale matter. The branches of physics science for this region include the nth level Planck scale matter dynamics and the nth level Planck scale matter group dynamics. The nth level Planck scale matter group dynamics describe how the nth level Planck scale matter constructs the (n+1)th level Planck scale matter and how the different matters of the nth level Planck scale evolve in the group system. This paper discovers that the different matters below Planck scale can exist with our matter world at the same time and same place and may be some candidates for dark matter; furthermore, this paper shows a relative theorem of matter scale: for the world of any nth level, the matters’ sizes are relative, not absolute. Evidently, the discoveries of both the symmetrical distribution scales and the relations among the corresponding different physics laws from infinitesimal to infinitely large scales give a scientific solid development platform for formation of new scientific branches and deeper development of old scientific branches, because we can precisely construct many kinds of scientific theories relevant to all the corresponding matter strata. All the branch sciences of different matter strata up to now naturally need to be included in the framework of the new scientific system of physics.","PeriodicalId":48962,"journal":{"name":"Advances in Astronomy","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2019/2501417","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41792540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparison of Decadal Trends among Total Solar Irradiance Composites of Satellite Observations 卫星观测太阳总辐射复合物的年代趋势比较

IF 1.4 4区物理与天体物理

Advances in Astronomy Pub Date : 2019-03-10 DOI: 10.1155/2019/1214896

N. Scafetta, R. Willson

{"title":"Comparison of Decadal Trends among Total Solar Irradiance Composites of Satellite Observations","authors":"N. Scafetta, R. Willson","doi":"10.1155/2019/1214896","DOIUrl":"https://doi.org/10.1155/2019/1214896","url":null,"abstract":"We present a new analysis of the two-decade-old controversy over interpretation of satellite observations of total solar irradiance (TSI) since 1978 and the implications of our findings for TSI as a driver of climate change. Our approach compares the methods of constructing the two most commonly referenced TSI composites (ACRIM and PMOD) that relate successive observational databases and two others recently constructed using a novel statistical approach. Our primary focus is on the disparate decadal trending results of the ACRIM and PMOD TSI composite time series, namely, whether they indicate an increasing trend from 1980 to 2000 and a decreasing trend thereafter (ACRIM) or a continuously decreasing trend since 1980 (PMOD). Construction of the four-decade observational TSI composites from 1978 to the present requires the use of results from two less precise Earth Radiation Budget experiments (Nimbus7/ERB and ERBS/ERBE) during the so-called ACRIM-Gap (1989.5–1991.8), between the end of the ACRIM1 and the beginning of the ACRIM2 experiments. The ACRIM and PMOD composites used the ERB and ERBE results, respectively, to bridge the gap. The well-established paradigm of positive correlation between Solar Magnetic Field Strength (SMFS) and TSI supports the validity of the upward trend in the ERB results and the corresponding decadal upward trend of the ACRIM composite during solar cycles 21 and 22. The ERBE results have a sensor degradation caused downward gap trend, contrary to the SMFS/TSI paradigm, that biased the PMOD composite decadal trend downward during solar cycles 21 and 22. The different choice of gap bridging data is clearly the cause of the ACRIM and PMOD TSI trending difference, agreeing closely in both magnitude and direction. We also analyze two recently proposed statistical TSI composites. Unfortunately their methodology cannot account for the gap degradation of the ERBE experiment and their resulting uncertainties are too large to uniquely distinguish between the trending of the ACRIM and PMOD composites. Our analysis supports the ACRIM TSI increasing trend during the 1980 to 2000 period, followed by a long-term decreasing trend since.","PeriodicalId":48962,"journal":{"name":"Advances in Astronomy","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2019/1214896","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43066467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Rain Attenuation Study at Ku-Band over Earth-Space Path in South Korea 韩国地空路径ku波段降雨衰减研究

IF 1.4 4区物理与天体物理

Advances in Astronomy Pub Date : 2019-03-03 DOI: 10.1155/2019/9538061

S. Shrestha, Dong-You Choi

引用次数: 8