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Lithofacies paleogeography mapping and reservoir prediction in tight sandstone strata: A case study from central Sichuan Basin, China

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Geoscience Frontiers 2017年第5期8卷 961-975页

作者： Yuan Zhong Lu Zhou Xiucheng Tan Chengbo Lian Hong liu Jijia Liao Guang Hu Mingjie liu {2. Cao State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Chengdu 610500 China Department of Earth Science and Technology Southwest Petroleum University Chengdu 610500 China School of Earth Sciences and Engineering Nanjing University Nanjing 210023 China

Sand-rich tight sandstone reservoirs are potential areas for oil and gas exploration. However, the high ratio of sandstone thickness to that of the strata in the formation poses many challenges and uncertainties to traditional lithofacies paleogeography mapping. Therefore, the prediction of reservoir sweet spots has remained problematic in the field of petroleum exploration. This study provides new insight into resolving this problem, based on the analyses of depositional characteristics of a typical modern sand-rich formation in a shallow braided river delta of the central Sichuan Basin, China. The varieties of sand-rich strata in the braided river delta environment include primary braided channels,secondary distributary channels and the distribution of sediments is controlled by the successive superposed strata deposited in paleogeomorphic valleys. The primary distributary channels have stronger hydrodynamic forces with higher proportions of coarse sand deposits than the secondary distributary channels. Therefore, lithofacies paleogeography mapping is controlled by the geomorphology, valley locations, and the migration of channels. We reconstructed the paleogeomorphology and valley systems that existed prior to the deposition of the Xujiahe Formation. Following this, rock-electro identification model for coarse skeletal sand bodies was constructed based on coring data. The results suggest that skeletal sand bodies in primary distributary channels occur mainly in the valleys and low-lying areas,whereas secondary distributary channels and fine deposits generally occur in the highland areas. The thickness distribution of skeletal sand bodies and lithofacies paleogeography map indicate a positive correlation in primary distributary channels and reservoir thickness. A significant correlation exists between different sedimentary facies and petrophysical properties. In addition, the degree of reservoir development in different sedimentary facies indicates that the mappin

关键词： Sand-rich strata Reservoir “sweet spot” Paleogeomorphology Primary distributary channel Lithofacies paleogeography

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水回流法提取煤基碳点及其荧光性能应用研究

化工新型材料 2024年第S1期52卷 412-417页

作者：刘雅雯董付涛安迪娜·艾萨江韩荣冯剑任铁真省部共建碳基能源资源化学与利用国家重点实验室煤炭清洁转化与化工过程新疆维吾尔自治区重点实验室新疆大学化工学院乌鲁木齐830046 新疆轻工职业技术学院乌鲁木齐830021

通过水回流法从3种煤中提取出了煤基碳点,对水溶剂回流时间与用量进行了工艺优化,所制备碳点具有蓝色荧光特征,通过红外表征确认了煤基碳点表面具有O—H、C=O、C—H等官能团,通过时间分辨荧光光谱计算出煤基碳点的荧光寿命为2.2.s。同... 详细信息

通过水回流法从3种煤中提取出了煤基碳点,对水溶剂回流时间与用量进行了工艺优化,所制备碳点具有蓝色荧光特征,通过红外表征确认了煤基碳点表面具有O—H、C=O、C—H等官能团,通过时间分辨荧光光谱计算出煤基碳点的荧光寿命为2.2.s。同时探究了3种煤基碳点在离子检测中的实际应用,它们作为荧光探针在与Fe^(3+)或Cu ^(2.)结合时会发生荧光淬灭,并且反应迅速,其中CCD-W1对Fe^(3+)和Cu^(2.)的检出限最低,检出限分别为0.16μmol/L和0.10μmol/L。

关键词：煤炭水回流法碳点荧光探针 Fe^(3+)和Cu^(2.)检测

Certificateless key-insulated signature without random oracles

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第12期10卷 1790-1800页

作者： Zhong-mei WAN Xue-jia LAI jian WENG Sheng-li liu Yu LONG Xuan HONG Department of Computer Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China College of Science Hohai University Nanjing 210098 China Department of Computer Science Jinan University Guangzhou 510630 China School of lnformation Systems Singapore Management University Singapore 178902 Singapore

Leakage of the private key has become a serious problem of menacing the cryptosystem security. To reduce the underlying danger induced by private key leakage, Dodis et al.(2.03) proposed the first key-insulated signature scheme. To handle issues concerning the private key leakage in certificateless signature schemes, we devise the first certificateless key-insulated signature scheme. Our scheme applies the key-insulated mechanism to certificateless cryptography, one with neither certificate nor key escrow. We incorporate Waters (2.05)’s signature scheme, Paterson and Schuldt (2.06)’s identity-based signature scheme, and liu et al.(2.07)’s certificateless signature scheme to obtain a certificateless key-insulated signature scheme. Our scheme has two desirable properties. First, its security can be proved under the non-pairing-based generalized bilinear Diffie-Hellman (NGBDH) conjecture, without utilizing the random oracle model; second, it solves the key escrow problem in identity-based key-insulated signatures.

关键词： Key-insulated Key leakage Certificateless Bilinear map

持续不卧床腹膜透析患者因梗阻性脓肾致腹膜透析相关性腹膜炎1例并文献复习

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中国血液净化 2024年第1期23卷 75-77页

作者：吴晓凤黎渐英李剑波林建雄刘苑莹郭群英中山大学附属第一医院肾内科广州510080 中山大学国家卫生健康委员会和广东省重点实验室广州510080

腹膜透析(peritoneal dialysis,PD)相关性腹膜炎通常由于接触污染或者出口处感染引起。也有少部分腹膜炎起因于肠道疾病,其中最常见的病因包括胃肠道穿孔、缺血性肠病和胆囊炎等。因梗阻性脓肾引起的腹膜炎极为罕见。该文报道了1例72.... 详细信息

腹膜透析(peritoneal dialysis,PD)相关性腹膜炎通常由于接触污染或者出口处感染引起。也有少部分腹膜炎起因于肠道疾病,其中最常见的病因包括胃肠道穿孔、缺血性肠病和胆囊炎等。因梗阻性脓肾引起的腹膜炎极为罕见。该文报道了1例72.男性腹膜透析患者因梗阻性左肾积脓引起的继发性腹膜炎,行左肾盂造瘘引流术和左肾切除术,最后未拔除腹膜透析管而继续腹膜透析治疗。随访8个月未再次发生腹膜炎。本研究报道了国内首例因梗阻性脓肾引起的持续不卧床腹膜透析合并继发性腹膜炎的病例,以提醒临床医生腹膜透析继发性腹膜炎可能的病因,为临床治疗决策提供依据。

关键词：腹膜透析继发性腹膜炎梗阻性肾积脓

Graphene-reinforced aluminum matrix composites prepared by spark plasma sintering

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International Journal of Minerals,Metallurgy and Materials 2016年第6期23卷 723-729页

作者： Wen-ming Tian Song-mei Li Bo Wang Xin Chen jian-hua liu Mei Yu School of Materials Science and Engineering Beihang University

Graphene-reinforced 7055 aluminum alloy composites with different contents of graphene were prepared by spark plasma sintering（SPS）. The structure and mechanical properties of the composites were investigated. Testing results show that the hardness, compressive strength, and yield strength of the composites are improved with the addition of 1wt% graphene. A clean, strong interface is formed between the metal matrix and graphene via metallurgical bonding on atomic scale. Harmful aluminum carbide（Al_4C_3） is not formed during SPS processing. Further addition of graphene（above 1wt%） results in the deterioration in mechanical properties of the composites. The agglomeration of graphene plates is exacerbated with increasing graphene content, which is the main reason for this deterioration.

关键词： metal matrix composites spark plasma sintering aluminum graphene mechanical properties

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“岩土工程数值方法”课程思政教育探索

教育教学论坛 2024年第32期 56-59页

作者：李伟华蔡国庆刘艳李舰北京交通大学土木建筑工程学院北京100044

课程思政建设不仅是实现“三全育人”的重要环节,也是落实立德树人根本任务的关键所在。针对工科专业课程“岩土工程数值方法”开展课程思政建设进行了初步探索。首先对课程背景、教学内容和课程思政的现状进行了阐述,系统论述了课程思... 详细信息

课程思政建设不仅是实现“三全育人”的重要环节,也是落实立德树人根本任务的关键所在。针对工科专业课程“岩土工程数值方法”开展课程思政建设进行了初步探索。首先对课程背景、教学内容和课程思政的现状进行了阐述,系统论述了课程思政建设的必要性。然后,从培养使命感和责任感、树立正确的辩证观和人生观、学习人生哲理、培养工程素养等四方面提出了“岩土工程数值方法”课程实施课程思政的策略,并给出了具体的教学案例,为在课堂上有效地实施思想政治教育提供了新的思路,为工科专业课程思政建设提供了参考。

关键词：课程思政岩土工程数值方法 “三全育人”

Frozen sand-concrete interface direct shear behavior under constant normal load and constant normal height boundary

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2022年第11期23卷 917-932页

作者： jian CHANG jian-kun {2. Ya-li LI School of Civil Engineering Beijing Jiaotong UniversityBeijing 100044China School of Civil Engineering Sun Yat-sen UniversityZhuhai 519082China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China

The shear strength properties of the frozen sand–structure interface are critical for evaluating the serviceability of pile foundations in frozen *** shear characteristics of the frozen sand–concrete interface were studied with two boundary conditions(constant normal load(CNL)and constant normal height(CNH)),at three normal stresses(100,2.0,and 300 k Pa),and at three temperatures(-2.-5,and-8℃).A detailed comparative analysis was performed to explore the principal factors affecting the shear/normal-shear *** results showed that the shear behavior of the frozen sand–concrete interface under CNL was similar to that under *** shear stress–shear displacement exhibited strain *** temperature and normal stress were the major influences on normal *** lower the temperature and the higher the normal stress,the greater was the elastic shear *** peak shear stress and critical shear stress exhibited a dependence on normal *** exponential growth in the peak shear stress was observed as the temperature *** shear stress was dependent on *** value and percentage of peak ice-cementation in peak shear stress was affected by temperature and normal stress.

关键词： Frozen sand–concrete interface Peak shear strength Critical shear strength Ice-cementation Boundary condition

Theorems of Helly's Type for Partially-closed Half-spaces

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Communications in Mathematical Research 2018年第2期34卷 117-124页

作者： liu jian-Guo Guo Qi Department of Mathematics Suzhou University of Science and Technology

In this article, under quite weaker conditions, theorems of Helly’s type for(not necessarily finite) family of partially closed half-spaces are presented in both analytic and geometric forms. Examples are also provid... 详细信息

关键词： Helly's theorem partially-closed half-space affine function convex set

Analysis of Differential Gene Expression Pattern in Brassica napus Hybrid Huayouza 6 and Its Parents Using Arabidopsis cDNA Microarray

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Agricultural Sciences in China 2006年第1期5卷 33-38页

作者： SHEN Jun-ru WU jian-yong ZHANG jian {2. Ping-wu YANG Guang-sheng College of Plant Science ＆ Technology National Key Laboratory of Crop Genetic Improvement Huazhong Agricultural University Wuhan 430070 P.RChina Yunnan Tobacco Research Institute Yuxi 653100 P.R.China China Tobacco Breeding Research （Southern） Center Yuxi 653100 P.R.China

Huayouza 6, a new semi-winter Brassica napus variety with high-yield, good quality, prematufity and extensive adaptability, was derived from the cross between the female parent 8086A and male parent 7-5. Two cDNA-based Arabidopisis microarray were used to analyze gene differential expression in bud of an elite *** hybrid Huayouza6 and its parents, in which there were 83 over-expression transcripts and 331 under-expression transcripts between Huayouza 6 and its female parent 8086A and 94 over-expression transcripts, and 42. under-expression transcripts were demonstrated between Huayouza 6 and its male parent 7-5. Further analysis showed that there were significant number of genes responsible for photosynthesis, and its implication for heterosis was discussed. Northern analysis of phosphoribulokinase coincided with its expression pattern derived from hybridization of Arabidopsis cDNA microarray and B. napus mRNA, this system of heterologous hybridization analysis should be applicable to other close relatives of Arabidopsis thaliana.

关键词： Brassica napus Arabidopsis cDNA-based microarray Huayouza 6 heterosis