|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Using Impervious Surfaces to Detect Urban Expansion in Beijing of China in 2000s显示文摘The change of impervious surface area(ISA) can effectively reveal the gradual process of urbanization and act as a key index for monitoring urban expansion. Experiencing rapid growth of the built environment in the 2000 s, urban expansion of Beijing has not been fully characterized through ISA. In this study, Landsat TM images of Beijing in 2001 and 2009 were obtained, and the eight-year urban expansion process in Beijing was analyzed using the ISA extracted by means of the vegetation-imperious surface-soil(V-I-S) model. From the spatial variation in ISA, the ring structure of urban expansion in Beijing was significant during the study period, with decreasing urban density from the city center to the periphery. In the ring road analysis, the most dramatic changes of ISA were found between the fifth ring and the sixth ring. This area has experienced the most new residential development, and is currently the main source of urban expansion. The typical profile lines revealed the directional characteristics of urban expansion. The east-west profile was the most urbanized axes in Beijing, while ISA change in the east-north profile was more significant than in the other five profiles. Moreover, the transition matrix of ISA levels revealed an increase in urban density in the low density built areas; the Moran′s I index showed a clear expansion of the central urban area, which spread contiguously; and the standard deviational ellipse indicated the northeast was the dominant direction of urban expansion. These findings can provide important spatial control guidelines in the next round of national economic and social development planning, overall urban and rural planning, and land use planning. | PENG Jian LIU Yanxu SHEN Hong XIE Pan HU Xiaoxu WANG Yanglin | 2016 | Chinese Geographical Science2016，26，2： | 11 |
| 2 | Geochronological Records of Oil-Gas Accumulations in the Permian Reservoirs of the Northeastern Ordos Basin显示文摘油气体累积(OGA ) 的地球年代学是在多周期的石油地质学的一个挑战性的题目附加的盆。由 K-Ar, authigenic illite (AI ) 和液体包括(FI ) 分析标明日期与磷灰石分裂轨道结合了(在船尾) 热建模,在东北 Ordos 盆(击) 抑制二叠的水库的 OGA 时间的案例研究在这份报纸被进行了。二叠的 oil-gas-bearing 沙岩核心样品标明日期的 AI 显示出 178108 妈的一个宽时间领域。AI 年龄的分发介绍主要 OGA 在二叠的水库处理的 2 阶段,它分别地与 165 妈和 130 妈的 2 山峰年龄在 175155 妈和 145115 妈的时间域发展了。现在二组织与的在船尾热的路径上的样品和他们的投射年龄的 FI 温度山峰不仅一低并且一座高山峰在 9078hallow 地下水的范围的温度能满足国家标准。(2 ) 从 coalbed 生产的水主要包含了 NaCl 獲漠 ? 慗整 ? 潃牰摯 ' 讚攥?潃污敢 ? 慇? 湡 ? 桓污潬 ? 片畯摮慷整 ? 湩 ? 畩楬? 潃污楦汥? 景 ? | CHEN Gang YANG Fu LI Shuheng ZHANG Huiruo HU Yanxu LEI Panpan | 2013 | Acta Geologica Sinica(English Edition)2013，87，6： | 4 |
| 3 | A soft actor-critic deep reinforcement learning method for multi-timescale coordinated operation of microgrids显示文摘This paper develops a multi-timescale coordinated operation method for microgrids based on modern deep rein-forcement learning.Considering the complementary characteristics of different storage devices,the proposed approach achieves multi-timescale coordination of battery and supercapacitor by introducing a hierarchical two-stage dispatch model.The first stage makes an initial decision irrespective of the uncertainties using the hourly predicted data to minimize the operational cost.For the second stage,it aims to generate corrective actions for the first-stage decisions to compensate for real-time renewable generation fluctuations.The first stage is formulated as a non-convex deterministic optimization problem,while the second stage is modeled as a Markov decision process solved by an entropy-regularized deep reinforcement learning method,i.e.,the Soft Actor-Critic.The Soft Actor-Critic method can efficiently address the exploration-exploitation dilemma and suppress variations.This improves the robustness of decisions.Simulation results demonstrate that different types of energy storage devices can be used at two stages to achieve the multi-timescale coordinated operation.This proves the effectiveness of the proposed method. | Chunchao Hu Zexiang Cai Yanxu Zhang Rudai Yan Yu Cai Bowei Cen | 2022 | Protection and Control of Modern Power Systems2022，7，1： | 2 |
| 4 | Research on China's high-grade highway design index of asphalt pavement with granular base显示文摘Based on the 2006 Chinese asphalt pavement deflection value design index, we used KENLAYER Pavement Analysis and Design software and 1stOpt statistical analysis software to carry on the nonlinear regression, this paper establish high-grade highway design equations for the compressive strain of soil sub-base top (CSSBT) and the radial compressive stress of semi-rigid base top (RCSRBT). The correlation coefficients inspection standard to get precise proof, which means that our granular base design equations have high credibility and can be used in the Chinese design index of asphalt pavement with granular base (APGB). | XiuShan Wang TaoTao Fan YanXu Gao Yi Hu | 2013 | Research in Cold and Arid Regions2013，5，4： | 2 |
| 5 | Steroidal saponins with anti-inflammatory activity from Tribulus terrestris L.显示文摘Objective:Tribulus terrestris L.(T.terrestris)is a highly valuable traditional Chinese medicine used to treat stroke,inflammation,pulmonary fibrosis,liver cancer,and urolithiasis.To identify the basic substance responsible for the anti-inflammatory effect of TST(total saponins of Tribulus),its chemical composition was systematically studied,and its effect of inhibiting nitric oxide generation and the expression of related inflammatory factors were determined.Methods:To separate chemical constituents from T.terrestris by column chromatography.Spectroscopic methods,including 1D and 2D nuclear magnetic resonance spectroscopy(NMR)and mass spectrometry(MS)techniques,were used to elucidate the isolated compounds.The anti-inflammatory activities of TST and several compounds were evaluated in vitro.Results:Fifteen steroidal saponins,including 9 furostanol steroidal saponins(1,2,3,4,5,6,7,8,and 15)and 6 isospirostanol steroidal saponins(9,10,11,12,13,and 14),were isolated from T.terrestris.TST significantly decreased the expression of tumor necrosis factor-a(TNF-a)and interleukin-6(IL-6)in RAW 264.7 cells stimulated by lipopolysaccharides.Compounds 13 and 15 evidently reduced TNF-a expression.Compounds 6,10,12,13,and 15 markedly reduced IL-6 expression.Conclusions:Compounds 1 was a novel furostanol steroidal saponin,named 26-O-b-D-glucopyranosyl-(25R)-5afurostan-12-carbonyl-20(22)-en-3b,26-diol-3-O-{b-D-xylopyranosyl-(1→2)-[b-D-xylopyranosyl-(1→3)]-b-D-glucopyranosyl-(1→4)-[a-L-rhamnopyranosyl-(1→2)]-b-D-galactopyranoside}.Compounds 2 was isolated from the family Zygophyllaceae for the first time,and 5 and 6 were isolated from the Tribulus genus.TST and compounds 6,10,12,13,and 15 exerts antiinflammatory activity. | Miaojie Yang Mahmood Brobbey Oppong Jingrui Di Qing Yuan Yanxu Chang Miaomiao Jiang Shijie Cao Pengzhi Dong Lin Li Yan Xie Xiaoying Luan Limin Hu Lijuan Chai Peng Zhang | 2022 | Acupuncture and Herbal Medicine2022，2，1： | 1 |
| 6 | Understanding SCLC heterogeneity and plasticity in cancer metastasis and chemotherapy resistance显示文摘Small cell lung cancer(SCLC)accounts for approximately 15%of all lung cancer cases and features a strong predilection for early metastasis and extremely poor prognosis.Despite being highly sensitive to chemotherapy and/or radiotherapy initially,most SCLC patients develop therapeutic resistance within one year and die of distant metastases.Multiple studies have revealed the high heterogeneity and strong plasticity of SCLC associated with frequent metastases and early development of therapeutic resistance as well as poor clinical outcome.Importantly,different SCLC subtypes are associated with different therapeutic vulnerabilities,and the inflamed subtype tends to have the best response to immunotherapy,which highlights the importance of precision medicine in the clinic.Here,we review recent advances in ScLc heterogeneity and plasticity and their link to distant metastases and chemotherapy resistance.We hope that a better understanding of the molecular mechanisms underlying SCLC malignant progression will help to develop better intervention strategies for this deadly disease. | Yujuan Jin Yanxu Chen Zhen Qin Liang Hu Chenchen Guo Hongbin Ji | 2023 | Acta Biochimica et Biophysica Sinica2023，55，6： | 0 |
| 7 | Petroleum geological features and hydrocarbon enrichment of Linhe Depression in Hetao Basin, NW China显示文摘Based on paleogeomorphology, drilling and seismic data, this paper systematically studies the structural and sedimentary evolution, source rock characteristics, reservoir characteristics and formation mechanism, hydrocarbon accumulation model and enrichment law in the Linhe Depression of the Hetao Basin, NW China. The Hetao Basin mainly experienced three stages of evolution, namely, weak extensional fault depression, strong extensional fault depression and strike-slip transformation, giving rise to four positive structural belts(Jilantai, Shabu, Nalinhu and Xinglong), which are favorable areas for oil and gas accumulation. The two main saline lacustrine source rocks, Lower Cretaceous Guyang Formation and Oligocene Linhe Formation, are characterized by high sulfur content, rich algae, early maturity, early expulsion, and wide oil generation window. The large structural transition belt in the intermountain area around the Hetao Basin controls the formation of large-scale braided river delta deposits, which are characterized by high quartz content(50%-76%), long-term shallow burial and weak compaction, low cement content, and good reservoir properties in delta front sandbody. The burial depth of the effective Paleogene reservoirs is predicted to reach 8000 m. Three hydrocarbon accumulation models, nose-uplift near sag, buried hill surrounding sag, fault nose near source rock, are constructed. The law of hydrocarbon accumulation in the Linhe Depression is finally clarified as follows: near-source around the depression is the foundation, high-quality thick reservoir is the premise, good tectonic setting and trap conditions are the key. | ZHANG Ruifeng HE Haiqing ZHU Qingzhong CHEN Shuguang LIU Xiheng DAN Weining HU Yanxu SHI Yulei ZHANG Yufei YU Haijun ZHANG Ximeng | 2023 | Petroleum Exploration and Development2023，50，4： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员