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Investigation of gravity influence on EOR and CO_(2) geological storage based on pore-scale simulation

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Petroleum Science 2024年第2期21卷 987-1001页

作者： Yong-Mao Hao Gui-Cheng Wu Zong-Fa li Zhong-hui Wu Yong-Quan Sun Ran liu Xing-Xing li Bo-Xin Pang Nan li Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao266580ShandongChina School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina School of Petroleum Engineering Yangtze UniversityWuhan430100HubeiChina Dongsheng Jinggong Petroleum Development Group Co. LtdShengli Oilfield CompanySINOPECDongying257001ShandongChina

Gravity assistance is a critical factor influencing CO_(2)-Oil mixing and miscible flow during EOR and CO_(2)geological *** on the Navier-Stokes equation,component mass conservation equation,and fluid property-composition relationship,a mathematical model for pore-scale CO_(2) injection in oilsaturated porous media was developed in this *** model can reflect the effects of gravity assistance,component diffusion,fluid density variation,and velocity change on EOR and CO_(2) *** nonhomogeneous porous media,the gravity influence and large density difference help to minimize the velocity difference between the main flow path and the surrounding area,thus improving the oil recovery and CO_(2) *** CO_(2) injection angles and oil-CO_(2) density differences can increase the oil recovery by 22.6% and 4.2%,respectively,and increase CO_(2) storage by 37.9% and 4.7%,*** diffusion facilitates the transportation of the oil components from the low-velocity region to the main flow path,thereby reducing the oil/CO_(2) concentration difference within the porous *** diffusion can increase oil recovery and CO_(2) storage by 5.7% and 6.9%,*** addition,combined with the component diffusion,a low CO_(2) injection rate creates a more uniform spatial distribution of the oil/CO_(2) component,resulting in increases of 9.5% oil recovery and 15.7% CO_(2) storage,*** study provides theoretical support for improving the geological CO_(2) storage and EOR processes.

关键词： Gravity Flow simulation CO_(2)-oil mixing Enhanced oil recovery(EOR) Geological storage

Analysis of Mitochondrial DNA from the Ancient Tombs of Turfan

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Chemical Research in Chinese Universities 2002年第4期18卷 419-423页

作者： CUI Yin-qiu DUAN Ran-hui liU Shu-bai JI Chao-neng ZHU Hong li Wei MAO Yu-min ZHOU hui Ancient DNA Laboratory College of Life ScienceJilin UniversityChangchun 130023P.R.China State Key Laboratory of Genetic Engineering School of Life ScienceFudan UniversityShanghai 200433P.R.China

MtDNA was successfully extracted from ten individual bones (femurs) in the tombs of ancient Jushi in Turfan basin, dated back to the year about 3 000-2 500 years ago. By means of four overlapping primers, we got nucleotide sequence of the 218bp length. Ancient mtDNA was analyzed by the sequencing of hypervariable region Ⅰ of the mtDNA control region. The result shows that 9 haplotypes with 24 polymorphic sites were obtained. The phylogenetic analysis indicated that Mongolians and Altai are the population genetically closest to the Jushi groups and Jushi mtDNA pool being an admixture of eastern Asian and European lineages. So our preliminary data imply that an ancient mingling of Euro-Asian population had existed in Turfan basin prior to the early Iron Age.

关键词： Ancient DNA Sequence Phylogenetic analysis

Manganese removal from the Qiantang River source water by pre-oxidation:A case study

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第3期10卷 450-457页

作者： Jian-wen ZHU Zhen ZHANG Xiao-min li Xin-hua XU Da-hui WANG Department of Environmental Engineering Zhejiang University Hangzhou 310027 China Hangzhou Water Group Company Ltd. Hangzhou 310009 China School of Bioscienee Taizhou University Linhai 317000 China

We evaluated several different pre-oxidation treatments, namely the introduction of either potassium permanganate (KMnO4), chlorine (Cl2), or both to remove manganese (Mn) from the Qiantang River source water. Our results showed that Mn removal percentages were 12.7%, 71.0%, 17.4% and 58.7% when none of the oxidants, KMnO4 only, Cl2 only, or both oxidants were added, respectively. Furthermore, a field study showed that when the available Mn concentration in the source water was 0.14 mg/L, it could be reduced to less than 0.05 mg/L when a solution of KMnO4 (0.47 mg/L) was added as the oxidant.

关键词： Pre-oxidation Potassium permanganate (KMnO2) Chlorine (Cl2) Manganese (Mn) removal

Effect of Surface Roughness on the Oxidation Behavior of a Directionally Solidified Ni-Based Superalloy at 1,100℃

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Acta Metallurgica Sinica(English Letters) 2015年第3期28卷 381-385页

作者： li Wang Wei-Guo Jiang Xiang-Wei li Jia-Sheng Dong Wei Zheng hui Feng Lang-Hong Lou Superalloys Division Institute of Metal ResearchChinese Academy of Sciences

The effect of surface roughness on the oxidation behavior of a directionally solidified Ni-based superalloy was investigated by surface mapping microscope,scanning electron microscope and X-ray *** was found that specimens with surface roughness of 0.05 urn exhibit the best oxidation resistance,while specimens with surface roughness of 0.14 μm behave worse than specimens with surface roughness of 0.83 μ*** specimens with surface roughness of 0.05 μm have the best oxidation resistance,which is mainly due to the smallest surface area exposed in air and thinnest work-hardening *** AlOlayer alleviates the oxidation process of the specimens with surface roughness of 0.83 μm,and this is the possible reason for the better oxidation resistance of samples with surface roughness of 0.83 μm than samples with surface roughness of 0.14 μm.

关键词： Superalloy Oxidation Surface roughness Surface area Work hardening

Starch grains from dental calculus reveal ancient plant foodstuffs at Chenqimogou site, Gansu Province

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Science China Earth Sciences 2010年第5期53卷 694-699页

作者： li MingQi YANG XiaoYan WANG hui WANG Qiang JIA Xin GE QuanSheng Institute of Geographical Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China Graduate School of the Chinese Academy of Sciences Beijing 100049China Gansu Provincial Institute of Cultural Relics and Archaeology Lanzhou 730000China Key Laboratory of Western China’s Environmental Systems MOELanzhou UniversityLanzhou 730000China

Chenqimogou site, located at the south bank of Tao River, is comprised of a large group of graves dated to ~4000 a BP. For its large scale, unique mortuary system, and abundant of typical artifacts, the site was named one of 'Top Ten Archaeological Discoveries of 2008 in China'. Many intact human skeletons have been excavated from the graves. Three teeth from two adult skeletons excavated from graves M187 and M194 were examined. Forty-eight starch grains were retrieved from dental calculus of three teeth. Six of those starch grains could not be identified because of damage. The others were classified into seven groups. Most of them were from wheat (Triticum aestivum) and/or barley (Hordeum vulgare). Remains possibly from foxtail millet (Setaria italica), buckwheat (Fagopyrum esculentum), gingkgo (Ginkgo biloba), acorn (Quercus spp.), bean, roots or tubers were identified. Ancient starch grains from dental calculus indicate that human foodstuffs primarily sourced from wheat, buckwheat, and foxtail millet. Acorn, beans, tubers or roots were supplements. A variety of starch grains retrieved from dental calculus revealed that diverse crops were cultivated in the Chenqimogou site 4000 years ago, and both dry-land farming and gathering were engaged.

关键词： Chenqimogou site Qijia Culture starch grain analysis dental calculus ancient plant diet

Construction of a shared system-based real-world clinical research system

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Frontiers of Medicine 2014年第3期8卷 382-388页

作者： huikun Wu Xiaodong li Fan Yang Dan Xie hui li Jingjing Huang Mingxing Guo Hubet Provincial Hospital of Traditional Chinese Medicine Wuhan 430061 China Hubei University of Chinese Medicine Wuhan 430065 China

Hubei Provincial Hospital of Traditional Chinese Medicine established research outpatient clinics to contribute to the major disease-entity research conducted by the National Traditional Chinese Medicine Clinical Research Base and to the construction of the National Traditional Chinese Medicine Treatment and Clinical Research Information Sharing System. With a view of developing a ＂real-world traditional Chinese medicine clinical research paradigm,＂ these clinics explored the mode of constructing research outpatient clinics from the aspects of clinical research, health management, and characteristics diagnosis and treatment.

关键词： clinical research shared system real world research outpatient clinic research hospital

Role of Ekman Transport Versus Ekman Pumping in Driving Summer Upwelling in the South China Sea

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Journal of Ocean University of China 2013年第3期12卷 355-365页

作者： WANG Dakui WANG hui li Ming liU Guimei WU Xiangyu Physical Oceanography Laboratory Ocean University of China Horn Point Laboratory University of Maryland Center for Environmental ScienceCambridge Key laboratory of research on marine hazards forecasting National Marine Environmental Forecasting Center College of Environment Science and Engineering Ocean University of China

Relative roles of Ekman transport and Ekman pumping in driving summer upwelling in the South China Sea （SCS） are examined using QuikSCAT scatterometer wind data. The major upwelling regions in the SCS are the coastal regions east and south- east of Vietnam （UESEV）, east and southeast of Hainan Island （UESEH）, and southeast of Guangdong province （USEG）. It is shown that the Ekman transport due to alongshore winds and Ekman pumping due to offshore wind stress curl play different roles in the three upwelling systems. In UESEV, Ekman pumping and Ekman transport are equally important in generating upwelling. The Ek- man transport increases linearly from 0.49 Sv in May to 1.23 Sv in August, while the Ekman pumping increases from 0.36 to 1.22 Sv during the same period. In UESEH, the mean estimates of Ekman transport and Ekman pumping are 0.14 and 0.07 Sv, respectively, indicating that 33% of the total wind-driven upwelling is due to Ekman pumping. In USEC~ the mean Ekman transport is 0.041 Sv with the peak occurring in July, while Ekman pumping is much smaller （0.003 on average）, indicating that the upwelling in this area is primarily driven by Ekman transport. In the summers of 2003 and 2007 following E1 Nifio-Southern Oscillation （ENSO） events, both Ekman transport and Ekman pumping decrease in UESEV due to the abnormally weak southwest monsoon. During the same events, however, Ekman transport is slightly enhanced and Ekman pumping is weakened in UESEH and USEG.

关键词： South China Sea upwelling Ekman transport Ekman pumping

Genome research profile of two Cordyceps sinensis cDNA libraries

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Chinese Science Bulletin 2010年第14期55卷 1403-1411页

作者： ZHANG ShaoPeng FENG hui li XiaoYan JIN YongSan DONG Wei Beijing Institute of Genomics Chinese Academy of Sciences Beijing 100029 China Graduate University of Chinese Academy of Sciences Beijing 100049 China StaffRoom of Traditional Chinese Medicine Diagnostics Beijing University of Chinese Medicine Beijing 100029 China Hangzhou Genomics Institute Hangzhou 310008 China Beijing Genomics Institute Beijing 100029 China

Cordyceps sinensis (CS) is well known as an ancient Chinese herb. It is used to expand bronchial smooth muscles, inhibit tumor growth and decrease blood pressure. Cordyceps sinensis is composed of two parts. One is the dead larvae body; the other is the stroma like withered grass. Up to now, few genome database articles about Cordyceps sinensis have been reported. In this study, two cDNA libraries were constructed using the worm part and grass part respectively for the first time. 12192 and 15456 clones from the worm-part (CSCA) and grass-part (CSBA) library were respectively picked. Sequences derived from CSCA were clustered into 1333 contigs and 2469 singlets, while those from CSBA were clustered into 1297 contigs and 2875 singlets. These ESTs include sequences representing a significant portion of proteins encoding genes in cell signalling, metabolism, information storage and processing. Some enzymes encoding genes were also found and linked with CS’s physiology such as proteases, peptidases, lipases and chitinase. Pairwise comparison between the two cDNA libraries was also studied. Some ESTs were found only in CSCA and some only in CSBA. Finally, a comparative genomics research was performed with Fusarium graminearum, Aspergillus nidulans, Neurospora crassa and Saccharomyces bayanus. The results indicate that the fungus’ genes maybe have complicated variation at the nucleic acid level, but the proteins translated are still conservative.

关键词：基因组数据库 cDNA文库冬虫夏草支气管平滑肌细胞信号传递小麦赤霉病菌比较基因组学环境技术

A CSI Acquisition Approach for mm Wave Massive MIMO

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China Communications 2019年第9期16卷 1-14页

作者： Shanzhi Chen Qiubin Gao Runhua Chen hui li Shaohui Sun Zhengxuan liu State Key Lab of Wireless Mobile Communication China Academy of Telecommunication Technology

Massive Multiple-Input Multiple-Output(MIMO)is considered as a key technology for 4G and 5G wireless communication systems to improve spectrum efficiency by supporting large number of concurrent *** addition,for the target frequency band of 5G system,mmWave band,massive MIMO is pivotal in compensating the high *** this paper,we investigate the channel state information(CSI)acquisition problem for mmWave massive *** hybrid analog-digital antenna architecture,how to derive the analog beamforming and digital beamforming is *** iterative analog beam acquisition approach is proposed to save system overhead and reduce beam searching *** the digital beamforming,a grouping based codebook is proposed to facilitate CSI *** codebook is then extended to incorporate also analog beam ***,channel reciprocity is exploited to save CSI reporting overhead and a two-stage approach is proposed to fully utilize the channel reciprocity at both mobile station and base station side and accelerate the CSI acquisition procedure.

关键词： codebook CSI acquisition hybridbeamforming