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Experiment and numerical simulation of distribution law of waterbased corrosion inhibitor in natural gas gathering and transportation pipeline

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Petroleum Science 2023年第3期20卷 1857-1873页

作者： En-Bin liu Hao Tang Yin-Hui Zhang Dang-jian Li Bo Kou ning liu Mohammadamin Azimi Petroleum Engineering School Southwest Petroleum UniversityChengdu610500China Research Institute of Natural Gas Technology Southwest Oil&Gasfield CompanyPetroChinaChengduSichuan610213China National Energy Research and Development Center of Sour Gas Exploitation PetroChinaChengduSichuan610213China Sour Gas Exploitation Pilot Test Center PetroChinaChengduSichuan610213China China United Coalbed Methane Corporation LtdTaiyuan030000China Trenchless Technology Center Louisiana Tech UniversityRustonLA71270USA

The transmission medium of natural gas gathering and transportation pipelines usually contains cor-rosive gases,which will cause serious corrosion on the inner wall of the pipelines when they coexist with ***,it is necessary to add corrosion inhibitor to form a protective film to protect the *** distribution of corrosion inhibitors in a gathering and transportation pipeline in Moxi gas field was studied by combining experiment and *** Pearson function was used to calculate the experimental and simulation results,and the correlation was more than 80%,indicating a high degree of *** simulation results show that:①The larger the pipe angle,filling speed and gas flow rate,the smaller the particle size,the better the distribution of corrosion inhibitor particles in the *** filling amount will affect the concentration,but the distribution trend is unchanged;②A method to determine the filling mode based on the loss was proposed,and for this pipeline,the loss of corrosion inhibitor was determined to be 5.31×10^(-3) kg/s,and the flling amount was recommended to be adjusted to 2o L/h,which has certain guiding significance for the actual flling strategy of pipeline corrosion inhibitor.

关键词： Corrosion inhibitor Corrosion Computational fluid dynamics Electrochemistry Droplet distribution

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An Efficient Reinforcement Learning Game Framework for UAV-Enabled Wireless Sensor Network Data Collection

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Journal of Computer Science & Technology 2022年第6期37卷 1356-1368页

作者： Tong Ding ning liu Zhong-Min Yan Lei liu Li-Zhen Cui School of Software Shandong UniversityJinan 250101China

With the developing demands of massive-data services,the applications that rely on big geographic data play crucial roles in academic and industrial *** aerial vehicles(UAVs),combining with terrestrial wireless sensor networks(WSN),can provide sustainable solutions for data *** rising demands for efficient data collection in a larger open area have been posed in the literature,which requires efficient UAV trajectory planning with lower energy consumption ***,there are amounts of inextricable solutions of UAV planning for a larger open area,and one of the most practical techniques in previous studies is deep reinforcement learning(DRL).However,the overestimated problem in limited-experience DRL quickly throws the UAV path planning process into a locally optimized ***,using the central nodes of the sub-WSNs as the sink nodes or navigation points for UAVs to visit may lead to extra collection *** paper develops a data-driven DRL-based game framework with two partners to fulfill the above demands.A cluster head processor(CHP)is employed to determine the sink nodes,and a navigation order processor(NOP)is established to plan the *** and NOP receive information from each other and provide optimized solutions after the Nash *** numerical results show that the proposed game framework could offer UAVs low-cost data collection trajectories,which can save at least 17.58%of energy consumption compared with the baseline methods.

关键词： wireless sensor network efficient data collection deep reinforcement learning game theory

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Oral Microbiota:A New Insight into Cancer Progression,Diagnosis and Treatment

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Phenomics 2023年第5期3卷 535-547页

作者： Xiu-Li Wang Hua-Wen Xu ning-ning liu State Key Laboratory of Systems Medicine for Cancer Center for Single-Cell OmicsSchool of Public HealthSchool of MedicineShanghai Jiao Tong UniversityShanghai 200025China

The polymorphic microbiome has been defined as one of the“Hallmarks of Cancer”.Extensive studies have now uncovered the role of oral microbiota in cancer development and ***,fungi,archaea,and viruses in the oral cavity interact dynamically with the oral microenvironment to maintain the oral micro-ecological *** complex interaction is influenced by many factors,such as maternal transmission,personal factors and environmental *** of oral microbiota can disturbed this host-microbiota interaction,leading to systemic *** studies have shown the potential associations between oral microbiota and a variety of ***,the underlying mechanisms and therapeutic insights are still poorly *** this review,we mainly focus on the following aspects:(1)the factors affect oral microbiota composition and function;(2)the interaction between microenvironment and oral microbiota;(3)the role of multi-kingdom oral microbiota in human health;(4)the potential underlying mechanisms and therapeutic benefits of oral microbiota against ***,we aim to describe the impact of oral microbiota on cancer progression and provide novel therapeutic insights into cancer prevention and treatment by targeting oral microbiota.

关键词： Oral microbiota Cancer Cancer diagnosis Tumor therapy

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Penile metastasis of osteosarcoma： a rare case report

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Asian Journal of Andrology 2013年第6期15卷 841-842页

作者： ning liu Li-Bo Man Guang-Lin Huang Department of Urology Beijing Jishuitan Hospital Beijing 100035 China

Dear Editor, Metastasis to the penis is rare, with no more than 500 cases reported to date. Primary tumours of sarcomatous origin are extremely rare, and no case ofosteosarcoma has been described in the literature. Here, we present a case of penile metastasis from osteosarcoma of the ischial tuberosity and discuss its possible metastatic mechanisms and clinical implications.

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Role of different examination methods in colorectal cancer screening:Insights and future directions

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World Journal of Gastroenterology 2024年第44期30卷 4741-4744页

作者： Qiu-ning liu Yang Ye Xiao-Qiang Jia Graduate School Beijing University of Chinese MedicineBeijing 100029China Department of Traditional Chinese Medicine Peking University Third HospitalBeijing 100191China Department of Anorectal Xiyuan HospitalChinese Academy of Traditional Chinese MedicineBeijing 100091China

Colorectal cancer is a malignant tumor with the third and second highest incidence and mortality rates worldwide,and its mortality rate is increasing *** cancer evolves gradually over a long period of *** evolving process from colorectal adenoma to colorectal cancer takes approximately 10-15 years,providing a sufficiently long"window period"for early screening and diagnosis of colorectal *** recurrence and mortality rates can be controlled at a low level with an early *** et al summarized existing screening methods and their applicable scope in a recent ***,they provide suggestions on how to improve *** editorial provides a commentary on their article and discuss the roles of different screening methods in the early screening of colorectal cancer.

关键词： Colorectal cancer Early screening of tumors Non-invasive liquid tissue biopsy Research progress

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Preparation and Mechanical Properties of-SiC Nanoparticle Reinforced Aluminum Matrix Composite by a Multi-step Powder Metallurgy Process

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Journal of Wuhan University of Technology(Materials Science) 2013年第6期28卷 1059-1063页

作者： WANG Linong WU Hao WU Xingping CHEN Minghai liu ning School of Electrical Engineering Wuhan University Suzhou Institute of Nano-tech and Nano-bionics Chinese Academy of Sciences School of Materials Science and Engineering Hefei University of Technology Wuhan Nari Co. Ltd.State of Grid Electric Power Research Institute

β-SiC nanoparticle reinforced A1 matrix （nano-SiCp/A1） composite was prepared by a multi- step powder metallurgy strategy including presureless sintering, hot compacting process and hot extrusion. The microstructures of the as-prepared composites were observed by scanning electronic microscopy （SEM）, and the mechanical properties were characterized by tensile strength measurement and Brinell hardness test. The experimental results revealed that the tensile strength of the composite with the addition of 5wt%/3-SIC nanoprtieles could be increased to 215 MPa, increasing by 110% compared with pure A1 matrix. Comparative experiments reflected that theβ-SIC nanoprticles showed significant reinforcement effect than traditional a-SiC micro-sized particles. The preparation process and sintering procedure were investigated to develop a cost effective preparation strategy to fabricate nano-SiCp/A1 composite.

关键词： β-SiC nanoparticles particulate reinforced Al matrix composite powder metallurgy

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Neoadjuvant chemoradiotherapy followed by laparoscopic distal gastrectomy in advanced gastric cancer: A case report and review of literature

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World Journal of Clinical Cases 2021年第11期9卷 2542-2554页

作者： Zi-ning liu Yin-Kui Wang Zi-Yu Li Key Laboratory of Carcinogenesis and Translational Research(Ministry of Education/Beijing) Gastrointestinal Cancer CenterPeking University Cancer Hospital&InstituteBeijing 100142China

BACKGROUND The laparoscopic technique has been widely applied for early gastric cancer,with the advantages of minimal invasion and quick ***,there is no report about the safety and oncological outcome of laparoscopic gastrectomy with D2 lymph node dissection for patients after neoadjuvant *** SUMMARY A 60-year-old man was diagnosed with advanced distal gastric cancer,cT4aN1M0 stage *** neoadjuvant chemoradiotherapy was performed based on the regimen of gross tumor volume 50G y/25 f and clinical target volume 45 Gy/25 f,as well as concurrent S-160 mg *** laparoscopic distal gastrectomy with D2 lymph node dissection was undertaken successfully for him after achieving partial response evaluated by radiological *** patient recovered smoothly without moderate or severe postoperative *** postoperative pathological stage was ypT3N0M0 with American Joint Committee on Cancer tumor regression grade *** was still in good condition after 5 years of *** Neoadjuvant chemoradiotherapy followed by laparoscopic technique could be applicable and may achieve satisfactory oncological *** finding requires further validation by cohort studies.

关键词： Gastric cancer Neoadjuvant chemoradiotherapy Laparoscopic Distal gastrectomy S-1 Case report

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Twinned Martensitic Substructure in a Water Quenched Fe–1.0 wt%C Alloy

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Acta Metallurgica Sinica(English Letters) 2022年第7期35卷 1157-1163页

作者： Haidong Sun Zuohua Wang Shuai Zhang ning liu Pinwen Zhu Dongli Yu Hongwang Zhang National Engineering Research Center for Equipment and Technology of Cold Strip Rolling College of Mechanical EngineeringYanshan UniversityQinhuangdao 066004China State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China Liren College of Yanshan University Yanshan UniversityQinhuangdao 066004China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China

A Fe–1.0 wt%C alloy was quenched into water from 1100 ℃,leading to lath martensite and plate martensite of body-centered tetragonal *** these two martensites have the twinned substructure that generates mirror symmetric diff raction patterns with extra diff raction spots around n/3(112).The twinned substructure has the origin from twinned martensitic variants,namely twin-related crystals separated by{110},rather than{112}deformation *** eff ect on the electron double diff raction of twinned variants was discussed.

关键词： Twinned martensitic substructure Twinned variant Lath martensite Plate martensite

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{112}<111>Twins or Twinned Variants Induced by Martensitic Transformation?

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Acta Metallurgica Sinica(English Letters) 2023年第1期36卷 133-140页

作者： Zuohua Wang Haidong Sun Peng Wang ning liu Pinwen Zhu Dongli Yu Hongwang Zhang National Engineering Research Center for Equipment and Technology of Cold Strip Rolling College of Mechanical EngineeringYanshan UniversityQinhuangdao 066004China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China Liren College of Yanshan University Yanshan UniversityQinhuangdao 066004China State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China

Twinned substructure in lath martensite was induced in the interstitial free(IF)steel via a high pressure thermal cycle(heating up to 1100℃and holding for 30 min,cooling at 10℃/s to room temperature under a pressure of 4 GPa).Experimental observations and theoretical simulation confrm that the twinned substructure has the origin related to the twinned variants rather than the bcc{112}twins,while extra difraction spots were caused by crystal overlapping rather than any extra *** diferences in crystallography and electron difraction behavior between twinned variants and{112}twins were discussed in detail.

关键词： Twinned variants {112}twins Martensitic transformation Crystal overlapping Electron difraction

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Surface Modification of 316L Stainless Steel by Grafting Methoxy Poly（ethylene glycol） to Improve the Biocompatibility

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Chemical Research in Chinese Universities 2015年第4期31卷 651-657页

作者： XIAO Yanlong ZHAO Lei SHI Yongfeng liu ning liu Yongli liu Bin XU Qinghua HE Chaoliang CHEN Xuesi The Second Hospital of Jilin University Changchun 130041 P. R. China Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P. R. China

Percutaneous coronary intervention（PCI） has become an important method for the treatment of the pa- tients with coronary heart disease; however, problems, such as vascular endothelial inflammation, late thrombosis, and stent restenosis still exist as a result of poor biocompatibility of the materials. To enhance the biocompatibility, methoxy poly（ethylene glycol）（mPEG） was immobilized on the surface of AISI 316 grade stainless steel（SS）（AISI： American Iron and Steel Institute）. First, silanized mPEG was synthesized by the direct coupling of mPEG with 3-isocyanatopropyltriethoxysilane（IPTS） via urethane bonds, and the silanized mPEG was then grafted on the surface of SS that was hydroxylated with piranha solution. The results obtained from contact angle goniometry, X-ray pho- toelectron spectroscopy（XPS）, and atomic force microscopy（AFM） confirm that the mPEG modified steel contained more C and Si and less Fe and Cr on its surface, exhibiting a morphological change and decrease in the contact angle. The biocompatibility of the mPEG modified SS was evaluated with fibrinogen adsorption, platelet activation and adhesion, and human umbilical vein endothelial celI（HUVEC） adhesion. Fibrinogen adsorption, platelet activation, and adhesion were clearly suppressed on the surface-modified steel. In addition, human umbilical vein endothelial cell（HUVEC） could adhere and proliferate on the surface of the mPEG-modified SS. This study indicates that the modification of 316L SS with mPEG could enhance the biocompatibility and provide a primary experimental founda- tion for the development of next-generation coronary stent materials for clinical application.

关键词： 316L stainless steel Methoxy poly(ethylene glycol)(mPEG) Surface modification Biocompatibility

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