检索结果-南通市图书馆

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

番禺市桥先锋社区微改造,广州,广东,中国

世界建筑 2024年第4期 50-53页

作者： guangzhou Atelier cnS Architectural Design Limited Company School of Architecture, South china university of Technology guangzhou Urban Planning and Design Company Limited 广州市竖梁社建筑设计有限公司华南理工大学建筑学院广州市城市规划设计有限公司

先锋社区位于市桥之心,自古以来承担着番禺政商中心的城市职能,是千年番禺历史文化的缩影,拥有显赫的宗族聚落文化和丰富的工商贸易文化遗存。21世纪以来,因番禺积极融入广州主城区发展,向北形成经济、教育、居住集聚区,导致番禺城市重... 详细信息

先锋社区位于市桥之心,自古以来承担着番禺政商中心的城市职能,是千年番禺历史文化的缩影,拥有显赫的宗族聚落文化和丰富的工商贸易文化遗存。21世纪以来,因番禺积极融入广州主城区发展,向北形成经济、教育、居住集聚区,导致番禺城市重心北移,市桥的功能和空间日渐衰落,成为番禺城市发展的洼地,旧日荣光不再。在中国全面推进城镇老旧小区改造的背景下,本项目以历史文化保护与集体回忆再现为导向,探究不同于一般老旧社区微改造的新路径、新思路。

关键词：历史文化保护老旧社区城市职能微改造集聚区集体回忆重心北移文化遗存

The Optical Variability of 3C 273

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Astronomy and astrophysics 2001年第3期1卷 245-249页

作者： Rui-Guang Lin (center for astrophysics, guangzhou university, guangzhou 510400) E-mail: lin_rg@*** center for astrophysics Guangzhou University Guangzhou 510400

B-band measurements of 3C273 over some 110 years are compiled and used in a search for periodicities using the Jurkevich method. Periods of 2.0, 13.65±0.20 and 22.5±0.2yr are found. If the long-term periodicity is from the instability of a slim disk, then the periodicity (~ 13yr or ~ 22-yr) suggests masses of 107M for the central black holes.

关键词： Galaxies: active - Galaxies: individual: 3C273

中国政治经济学年度发展报告（2023）（下）

在线全文

学校读者我要写书评

暂无评论

政治经济学评论 2024年第3期 90+207-208页

作者： center for Studies of Contemporary Political Economy,Research Institute for 21st-Century Marxism,Nankai university·university of Chinese Academy of Social Science center for Teaching and Research on Capital,Renmin university of china National Institute of Socialist Political Economy with Chinese Characteristics,Renmin university of china 南开大学·中国社会科学院大学21世纪马克思主义研究院当代政治经济学研究中心中国人民大学《资本论》教学与研究中心中国人民大学全国中国特色社会主义政治经济学研究中心

编者按2023年，高质量发展扎实推进，新质生产力加快形成，我国经济总体回升向好，圆满实现发展主要预期目标。为针对性地破解经济恢复发展中的难题，聚焦推进中国式现代化进程中的重点、难点问题，中国政治经济学界开展系统深入研究，...

编者按2023年，高质量发展扎实推进，新质生产力加快形成，我国经济总体回升向好，圆满实现发展主要预期目标。为针对性地破解经济恢复发展中的难题，聚焦推进中国式现代化进程中的重点、难点问题，中国政治经济学界开展系统深入研究，取得系列代表性成果。为准确刻画学界研究进展和轨迹，推动中国经济学理论体系的构建和完善，本刊精选议题如期奉上《中国政治经济学年度发展报告（2023）》。自2010年起，本刊连续十四年发布《中国政治经济学年度发展报告》，“年度发展报告”专栏已成为本刊标志性特色栏目。2023年报告聚焦12个专题，分为（上）（下）两篇，其中专题1—6于报告（上）篇刊登，专题7—12由报告（下）篇刊登。2023年报告（下）选题如下：

关键词：

Spectral Indices of Core and Extended Components of Extragalactic Radio Sources

同方期刊数据库人大复印报刊资料评论

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Astronomy and astrophysics 2003年第5期3卷 415-422页

作者： Jiang-Shui Zhang and Jun-Hui Fancenter for astrophysics, guangzhou university, guangzhou 510400 zjshui center for astrophysics Guangzhou University Guangzhou 510400

We use observed peak and total flux densities at 6cm and 20cm to determine the spectral indices separately for the core and extended components of QSOs and galaxies, as well as their core-dominance parameters. Our results indicate that 1) Nine QSOs show both greater than 1.0 core-dominance parameters (those objects should be blazars) and greater than 0.5 spectral indices. The average core spectral index is αCore = 0.85±0.21 for the nine blazars, which implies that it is not reliable to use αradio = 0.0 for blazars. For the different subclasses, the core and extended spectral indices are as follows: for the blazars, αCore = 0.22±0.06 and αExt =0.77±0.12; the galaxies,αCore = 1.01±0.13 and αExt =0.83±0.21, and for the QSOs, αCore = 0.28±0.10 and αExt =0.68±0.08. 2) The core spectral index and core dominance parameter (R) show an anti-correlation, αC = (-1.28±0.26) log R+ (0.65 ± 0.11); 3) R is approximately linearly correlated with redshift (z).

关键词： galaxies: active - radio continuum: galaxies

The line emissions and polarization in blazars

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2010年第6期53卷 1162-1168页

作者： YANG JiangHe 1,2 ,FAN JunHui 2,3 & YANG RuShu 1 1 Department of Physics and Electronics Science,Hunan university of Arts and Science,Changde 415000,china 2 center for astrophysics,guangzhou university,guangzhou 510405,china 3 Key Laboratory of Astronomy Observation and Technology,guangzhou university,guangzhou 510405,china 1. Department of Physics and Electronics Science Hunan University of Arts and Science Changde 415000 China2. Center for Astrophysics Guangzhou University Guangzhou 510405 China3. Key Laboratory of Astronomy Observation and Technology Guangzhou University Guangzhou 510405 China

The correlations between broad-line emission,polarization,and core-dominance parameters are investigated for a sample of 148 blazars(BL Lacertae objects-BLs and flat spectrum radio quasars-FSRQs). An anti-correlation between the broad-line luminosity and the linear polarization is found. The broad-line and polarization relation can be explained by using a relativistic beaming model,which perhaps suggests that BL Lacs and FSRQs are a single class. We also investigated the relation between the ratio of the broad-line luminosity to the Eddington luminosity and linear polarization,and that between the ratio of the broad-line luminosity to the Eddington luminosity and the core-dominance parameter.

关键词： blazars(BL Lacs and FSRQs) emission line polarization jets

Identification and construction of Boolean functions with maximum algebraic immunity

在线全文

学校读者我要写书评

暂无评论

Science china(Information Sciences) 2010年第7期53卷 1379-1396页

作者： LIU MeiCheng, PEI DingYi & DU YuSong College of Mathematics and Information Sciences, guangzhou university, guangzhou 510006, china 1. College of Mathematics and Information Sciences Guangzhou University Guangzhou 510006 China

Boolean functions with maximum algebraic immunity have been considered as one class of cryptographically significant functions. It is known that Boolean functions on odd variables have maximum algebraic immunity if and only if a correlative matrix has column full rank, and Boolean functions on even variables have maximum algebraic immunity if and only if two correlative matrices have column full rank. Recently, a smaller matrix was used in the odd case. We find that one or two smaller matrices can be used in the even case and consequently present several sufficient and necessary conditions for Boolean functions with maximum algebraic immunity. This result advances the ability to identify whether Boolean functions on even variables achieve maximum algebraic immunity. We also present a construction algorithm for n-variable Boolean functions with maximum algebraic immunity, specially with the Hamming weights of ∑2 n i=0 -1 . It is easily realized for not too large n and helps construct balanced Boolean functions with maximum algebraic immunity on even variables. Furthermore, we present a sufficient and necessary condition for balanced Boolean functions to achieve maximum algebraic immunity and optimum algebraic degree, and modify the construction algorithm to con- struct Boolean functions on odd variables with maximum algebraic immunity, optimum algebraic degree and high nonlinearity.

关键词： Boolean functions MAI functions algebraic attacks algebraic immunity algebraic degree non-linearity

Dark respiration in the light and in darkness of three marine macroalgal species grown under ambient and elevated CO_2 concentrations

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2011年第1期30卷 106-112页

作者： ZOU Dinghui GAO Kunshan XIA Jianrong College of Environmental Science and Engineering South China University of Technology Guangzhou 510006 China The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters Ministry of Education Guangzhou 510006 China State Key Laboratory of Marine Environmental Science Xiamen University Xiamen 361005 China College of Environmental Science and Engineering Guangzhou University Guangzhou 510006 China

Dark respiration （non-photorespiratory mitochondrial respiration）, which occurs both in the light and in darkness, is vital for growth and survival of algae and plays a critical role in modulating the carbon balance of them. In the present study, we have investigated dark respiration in the light （RL） and in darkness （RD） in three marine macroalgal species, Hizikia fusiformis （phaeophyta）, Gracilaria lemaneiformis （Rhodophyta） and Ulva lactuca （Chlorophyta）, cultured at 20 ℃ using aeration with two CO2 conditions： current ambient （CO2 concentration about 380 μl/L） and elevated CO2 （approximately 720 μl/L） air. RL was estimated by using the Kok method, whereas RD was determined as the rate of O2 influx at zero light. The results showed that both RL and RD were unchanged for the elevated CO2-grown algae relative to ambient CO2 concentration for all the algal species tested. However, RL was significantly lower than RD across all the algal species and growth CO2 treatments, demonstrating that daytime respiration was partly depressed by the light. The percentage of inhibition of respiration by light was similar between ambient and elevated CO2- grown algae. The ratio of respiration to photosynthesis, which tended to decrease when estimated using RL instead of RD, was not altered for the elevated relative to ambient CO2 concentration. The results suggest that RL, rather than RD, is a more accurate estimate of nonphotorespiratory carbon loss in marine macroalgae during the daytime. It would not be anticipated that elevated atmospheric CO2 would exert a substantial influence on respiratory flux either in the light or in darkness in these particular marine macroalgal species.

关键词： marine macroalgae respiration CO2 carbon balance

Extragalactic H_2O Megamaser Sources:Central Black Holes,Nuclear X-ray and Maser Emissions

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Astronomy and astrophysics 2008年第5期8卷 547-554页

作者： Jiang-Bo Su Jiang-Shui Zhang Jun-Hui Fan center for astrophysics Guangzhou University Guangzhou 510006 China

Extragalactic H2O megamasers are typically found within the innermost few parsecs of active galaxy nuclei （AGN） and the maser emission is considered to be excited most likely by the X-ray irradiation of the AGN. We investigate a comprehensive sample of extragalactic H2O masers in a sample of 38 maser host AGN to check potential correlations of the megamaser emission with parameters of the AGN, such as X-ray luminosity and black hole （BH） masses. We find a relation between the maser luminosities and BH masses LH2O∝MBH^3.6±0.4 which supports basically the theoretical prediction. The relation between the maser emission and X-ray emission is also confirmed.

关键词： galaxies active -galaxies nuclei -masers

Cloning of artemisinin biosynthetic cDNAs and novel ESTs and quantification of low temperature-induced gene overexpression

在线全文

学校读者我要写书评

暂无评论

Science china(Life Sciences) 2008年第3期51卷 232-244页

作者： ZENG QingPing1, ZHAO Chang1, YIN LuLu1, YANG RuiYi1, ZENG XiaoMei1, HUANG Ying2, FENG LiLing3 & YANG XueQin3 1 Laboratory of Biotechnology, Tropical Medicine Institute, guangzhou university of Chinese Medicine, guangzhou 510405, china 2 guangzhou General Hospital, guangzhou Military Area Command of Chinese PLA, guangzhou 510010, china 3.center of Artemisinin Research, guangzhou university of Chinese Medicine, guangzhou 510405, china 1. Laboratory of Biotechnology Tropical Medicine Institute Guangzhou University of Chinese Medicine Guangzhou 510405 China 2. guangzhou General Hospital Guangzhou Military Area Command of Chinese PLA Guangzhou 510010 China 3. center of Artemisinin Research Guangzhou University of Chinese Medicine Guangzhou 510405 China

To isolate and verify novel genes from qinghao (Artemisia annua) based on the development-specific and environment-induced transcriptomics, leaves have been harvested from the flowering A. annua plants and exposed to low temperature for isolation of total RNAs and cloning of full-length cDNAs and cDNA fragments, or expressed sequence tags (ESTs). After being sequenced and browsed for homol- ogy, these sequences have been submitted to GenBank. Among the accessed 75 sequences, 4 full-length cDNAs are highly homologous to the known A. annua genes, but 71 ESTs are absent in the sequence records of A. annua genes, in which 34 sequences are homologous to other plant genes, including 24 identified protein-coding sequences and 10 unidentified protein-coding sequences, while other 37 sequences are not present in the sequence records of any plant genes, representing the first cloned plant genes. In order to investigate the responsive patterns of A. annua genes to extreme envi- ronmental stresses, especially low temperature, the expression levels of 3 critical qinhaosu (artemisi- nin) biosynthetic genes, ADS, CYP71AV1 and CPR, have been measured in pre- and post-chilling A. annua seedlings cultured in vitro by semi-quantitative PCR (SQ-PCR). Consequently, ADS and CYP71AV1 genes are strongly induced by chilling, but CPR gene is not significantly affected by such treatment. Furthermore, induction of these genes by chilling can be potently suppressed by Ca2+ channel inhibitor LaCl3 or Ca2+ chelator EGTA, suggesting a putative involvement of Ca2+-CaM signal transduction pathway in chilling-induced overexpression of ADS and CYP71AV1 genes. The real-time fluorescent quantitative PCR (RFQ-PCR) assay of A. annua seedlings exposed to chilling has shown that the expression level of CaM gene is up-regulated for more than 2.5 folds, thereby confirming our above inference on the relevance of Ca2+-CaM-mediated signal transduction to chilling-induced gene overexpression. Finally, 7 newly iso

关键词： Artemisia annua expressed sequence tag (EST) abiotic stress signal transduction fluorescent quantification