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An optimal flow rate allocation model of the oilfield treated oil pipeline network

Petroleum 2024年第1期10卷 93-100页

作者： Hai Li Tianyou Fan Kun Wang xueyuan long Yu He Meng Wang Wen Cheng Qian Huang Huirong Huang Weichao Yu PetroChina Southwest Oil & Gasfield Company China Petroleum Planning & Engineering Institute School of Petroleum Engineering Chongqing University of Science and Technology PipeChina Oil & Gas Control Center

Oilfield treated oil pipeline network is the link connecting the upstream oilfields and the downstream refineries. Due to the differences in operating costs and transportation fee between different pipelines and the fluctuation in the demand and sales prices of the treated oil, there is an optimal flow allocation plan for the pipeline network to make the oilfield company obtain the highest social and economic benefit. In this study, a mixed integer nonlinear programming(MINLP) model is developed to determine the optimal flow rate allocation plan of the large-scale and complex treated oil pipeline network, and both the social and economic benefits are considered simultaneously. The optimization objective is the multi-objective which includes the largest user satisfaction and the highest economic benefit. The model constraints include the oilfield production capacity, refinery demand, pipeline transmission capacity,flow, pressure, and temperature of the node and station, and the pipeline hydraulic and thermal calculations. Python 3.7 is utilized for the programming of the off-line calculation procedure and the MINLP model, and GUROBI 9.0.2 is served as the MINLP solver. Moreover, the model is applied to a real treated oil pipeline network located in China, and three optimization scenarios are analyzed. For social benefit,the values of the user satisfaction of each refinery and the total network are 1 before and after optimization for scenarios 1, 2, and 3. For economic benefit, the annual revenue can be increased by 0.227,0.293, and 0.548 billion yuan after the optimization in scenario 1, 2, and 3, respectively.

关键词： Treated oil pipeline network Flow rate allocation Optimal User satisfaction Economic benefit

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Predicting stability of integrated circuit test equipment using upper side boundary values of normal distribution

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The Journal of China Universities of Posts and Telecommunications 2024年第2期31卷 85-93页

作者： Zhan Wenfa Hu Xinyi Zheng Jiangyun Yu Chuxian Cai xueyuan Zhang Lihua School of Electronic Engineering and Intelligent Manufacturing Anqing Normal UniversityAnqing 246133China School of Computer and Information Technology Anqing Normal UniversityAnqing 246133China

In response to the growing complexity and performance of integrated circuit(IC),there is an urgent need to enhance the testing and stability of IC test equipment.A method was proposed to predict equipment stability using the upper side boundary value of normal ***,the K-means clustering algorithm classifies and analyzes sample *** accuracy of this boundary value is compared under two common confidence levels to select the optimal threshold.A range is then defined to categorize unqualified test *** experimental verification,the method achieves the purpose of measuring the stability of qualitative IC equipment through a deterministic threshold value and judging the stability of the equipment by comparing the number of unqualified data with the threshold value,which realizes the goal of long-term operation monitoring and stability analysis of IC test equipment.

关键词： K-means clustering algorithm the upper side boundary of normal distribution threshold integrated circuit(IC)test equipment stability analysis

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Activation of autophagy by Citri Reticulatae Semen extract ameliorates amyloid-beta-induced cell death and cognition deficits in Alzheimer’s disease

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Neural Regeneration Research 2024年第11期19卷 2467-2479页

作者： Yong Tang Jing Wei Xiao-Fang Wang Tao long Xiaohong Xiang Liqun Qu Xingxia Wang Chonglin Yu Xingli Xiao xueyuan Hu Jing Zeng Qin Xu Anguo Wu Jianming Wu Dalian Qin Xiaogang Zhou Betty Yuen-Kwan Law Dr.Neher’s Biophysics Laboratory for Innovative Drug Discovery State Key Laboratory of Quality Research in Chinese MedicineMacao University of Science and TechnologyMacao Special Administrative RegionChina Sichuan Key Medical Laboratory of New Drug Discovery and Druggability Evaluation Luzhou Key Laboratory of Activity Screening and Druggability Evaluation for Chinese Materia Medica Southwest Medical UniversityLuzhouSichuan ProvinceChina Eye School and Key Laboratory of Sichuan Province Ophthalmopathy Prevention&Cure and Visual Function Protection of Chengdu University of TCM ChengduSichuan ProvinceChina School of Basic Medical Sciences Southwest Medical UniversityLuzhouSichuan ProvinceChina Department of Ophthalmology The Affiliated Hospital of Southwest Medical UniversityLuzhouSichuan ProvinceChina Department of Neurology The First People’s Hospital of NeijiangNeijiangSichuan ProvinceChina

Amyloid-beta-induced neuronal cell death contributes to cognitive decline in Alzheimer’s *** Reticulatae Semen has diverse beneficial effects on neurodegenerative diseases,including Parkinson’s and Huntington’s diseases,however,the effect of Citri Reticulatae Semen on Alzheimer’s disease remains *** the current study,the anti-apoptotic and autophagic roles of Citri Reticulatae Semen extract on amyloid-beta-induced apoptosis in PC12 cells were first *** Reticulatae Semen extract protected PC12 cells from amyloid-beta-induced apoptosis by attenuating the Bax/Bcl-2 ratio via activation of *** addition,Citri Reticulatae Semen extract was confirmed to bind amyloid-beta as revealed by biolayer interferometry in vitro,and suppress amyloid-beta-induced pathology such as paralysis,in a transgenic Caenorhabditis elegans in vivo ***,genetically defective Caenorhabditis elegans further confirmed that the neuroprotective effect of Citri Reticulatae Semen extract was *** importantly,Citri Reticulatae Semen extract was confirmed to improve cognitive impairment,neuronal injury and amyloid-beta burden in 3×Tg Alzheimer’s disease *** revealed by both in vitro and in vivo models,these results suggest that Citri Reticulatae Semen extract is a potential natural therapeutic agent for Alzheimer’s disease via its neuroprotective autophagic effects.

关键词： Alzheimer’s disease amyloid-beta apoptosis autophagy Caenorhabditis elegans Citri Reticulatae Semen

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Vacancy healing for stable perovskite solar cells via bifunctional potassium tartrate

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Journal of Energy Chemistry 2024年第1期88卷 64-70,I0002页

作者： Jing Dou Yue Ma Xiuxiu Niu Wentao Zhou xueyuan Wei Jie Dou Zhenhua Cui Qizhen Song Tinglu Song Huanping Zhou Cheng Zhu Yang Bai Qi Chen Experimental Centre for Advanced Materials School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationBIC-ESATSchool of Materials Science and EngineeringPeking UniversityBeijing 100871China

Perovskite solar cell has gained widespread attention as a promising technology for renewable ***, their commercial viability has been hampered by their long-term stability and potential Pb leakage. Herein, we demonstrate a bifunctional passivator of the potassium tartrate(PT) to address both challenges. PT minimizes the Pb leakage in perovskites and also heals cationic vacancy defects, resulting in improved device performance and stability. Benefiting from PT modification, the power conversion efficiency(PCE) is improved to 23.26% and the Pb leakage in unencapsulated films is significantly reduced to 9.79 ppm. Furthermore, the corresponding device exhibits no significant decay in PCE after tracking at the maximum power point(MPP) for 2000 h under illumination(LED source, 100 mW cm^(-2)).

关键词： Perovskite Potassium tartrate Lead leakage long-term stability

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水溶性无机盐对三甘醇脱水性能影响的实验研究

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石油与天然气化工 2023年第2期52卷 9-15页

作者：龙学渊周贇孟江梁智宇重庆科技学院四川川港燃气有限责任公司

目的分析作为主要杂质之一的水溶性无机盐对三甘醇(TEG)脱水性能影响的原因,为三甘醇质量控制提供依据。方法通过分析废三甘醇水溶性无机盐的组分和质量分数,确定了NaCl、KCl、MgCl_(2)、CaCl_(2)、Na_(2)SO_(4)、NaHCO 3、FeCl_(3)、Ba... 详细信息

目的分析作为主要杂质之一的水溶性无机盐对三甘醇(TEG)脱水性能影响的原因,为三甘醇质量控制提供依据。方法通过分析废三甘醇水溶性无机盐的组分和质量分数,确定了NaCl、KCl、MgCl_(2)、CaCl_(2)、Na_(2)SO_(4)、NaHCO 3、FeCl_(3)、BaCl_(2)、NaF 9种水溶性无机盐作为杂质,分别在质量分数为15.5 mg/g、温度为182℃的条件下,循环再生50次和连续加热48 h,以模拟循环再生三甘醇和滞留在重沸器中三甘醇的再生过程,分析了再生三甘醇组分和性质变化。结果在多次循环再生的条件下,水溶性无机盐对三甘醇的组分和性质几乎没有影响,只是水含量有所增大。而在连续长时间加热再生的条件下,三甘醇有效含量下降,有机杂质增多。这些有机杂质并不适应三甘醇脱水系统的要求,造成再生后的三甘醇脱水性能和pH值下降、发泡性能增强。结论水溶性无机盐对三甘醇性质的影响主要取决于再生条件,循环再生不会影响三甘醇的性质。在再生温度下连续长时间加热,水溶性无机盐会使三甘醇性质发生明显变化,从而使三甘醇在脱水系统中的适应性下降。

关键词：三甘醇水溶性无机盐天然气脱水

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固体杂质对天然气脱水用三甘醇质量影响的实验研究

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天然气化工—C1化学与化工 2022年第5期47卷 106-112页

作者：龙学渊程浩张其敏黄茜孟江重庆科技学院石油与天然气工程学院重庆401331 中石油青海油田天然气公司青海格尔木816000

在天然气三甘醇脱水工艺中,固体杂质是影响三甘醇质量的重要因素。根据废三甘醇中的主要固体杂质种类,确定了FeS、Fe_(2)O_(3)、CaCO_(3)、CaSO_(4)、CuO、Al_(2)O_(3)和ZnO 7种固体杂质,利用搭建的三甘醇再生装置、红外光谱仪和色谱质... 详细信息

在天然气三甘醇脱水工艺中,固体杂质是影响三甘醇质量的重要因素。根据废三甘醇中的主要固体杂质种类,确定了FeS、Fe_(2)O_(3)、CaCO_(3)、CaSO_(4)、CuO、Al_(2)O_(3)和ZnO 7种固体杂质,利用搭建的三甘醇再生装置、红外光谱仪和色谱质谱联动仪等仪器,通过实验研究了长时间加热条件下不同固体杂质对三甘醇有机杂质组分和性质的影响。结果表明,在182℃连续加热48 h的条件下,受固体杂质影响,三甘醇有机杂质种类明显增多且质量分数增大;不同固体杂质对三甘醇变质的影响存在差异,CuO>Al_(2)O_(3)>FeS>CaSO_(4)>Fe_(2)O_(3)>CaCO_(3)>ZnO。固体杂质引起三甘醇变质的主要原因是固体杂质具有一定的催化活性,会促进三甘醇高温下的分解、分子间和分子内脱水以及氧化等反应,使甘醇类和有机酸类杂质含量明显增大。不同固体杂质的催化活性强弱不同,其中CuO和Al_(2)O_(3)催化活性最强,ZnO最弱。因此,需要严格控制CuO在三甘醇中的含量。三甘醇中有机杂质组分种类和含量的增大,导致三甘醇颜色加深、产生芳香气味、pH降低、发泡性能增强、蒸发损失增大以及脱水和再生性能下降,造成三甘醇质量恶化,降低了其在脱水工艺中的适应性。

关键词：三甘醇固体杂质天然气脱水变质

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Oral anti-coagulants use in Chinese hospitalized patients with atrial fibrillation

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Chinese Medical Journal 2024年第2期137卷 172-180页

作者： Jing Lin Deyong long Chenxi Jiang Caihua Sang Ribo Tang Songnan Li Wei Wang xueyuan Guo Man Ning Zhaoqing Sun Na Yang Yongchen Hao Jun Liu Jing Liu Xin Du Louise Morgan Gregg C.Fonarow Sidney C.Smith Jr Gregory Y.H.Lip Dong Zhao Jianzeng Dong Changsheng Ma On behalf of CCC-AF investigators Department of Cardiology Beijing Anzhen HospitalCapital Medical UniversityBeijing 100029China National Clinical Research Center for Cardiovascular Diseases Beijing 100029 China Department of Epidemiology Beijing Anzhen HospitalCapital Medical UniversityBeijing Institute of HeartLung and Blood Vessel DiseasesBeijing 100029China International Quality Improvement Department American Heart AssociationDallasTX 07076USA Division of Cardiology Geffen School of Medicine at University of CaliforniaLos Angeles CA 90024USA Division of Cardiology University of North CarolinaChapel HillNC 27599USA Department of Cardiology Liverpool Centre for Cardiovascular ScienceUniversity of Liverpool and Liverpool Heart&Chest HospitalLiverpool L143PEUK Department of Clinical Medicine Aalborg UniversityAalborg 9000Denmark 不详

Background:Oral anti-coagulants(OAC)are the intervention for the prevention of stroke,which consistently improve clinical outcomes and survival among patients with atrial fibrillation(AF).The main purpose of this study is to identify problems in OAC utilization among hospitalized patients with AF in ***:Using data from the Improving Care for Cardiovascular Disease in China-Atrial Fibrillation(CCC-AF)registry,guideline-recommended OAC use in eligible patients was ***:A total of 52,530 patients with non-valvular AF were enrolled from February 2015 to December 2019,of whom 38,203 were at a high risk of stroke,9717 were at a moderate risk,and 4610 were at a low *** admission,only 20.0%(6075/30,420)of patients with a diagnosed AF and a high risk of stroke were taking *** use of pre-hospital OAC on admission was associated with a lower risk of new-onset ischemic stroke/transient ischemic attack among the diagnosed AF population(adjusted odds ratio:0.54,95%confidence interval:0.43-0.68;P70%of AF patients were at a high risk of *** poor performance on guideline-recommended OAC use was found in this study,over time the CCC-AF project has made progress in stroke prevention in the Chinese AF ***

关键词： Atrial fibrillation Oral anti-coagulants OAC Stroke prevention Contraindication

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TVD/LW混合格式在天然气管线瞬变仿真中的应用

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化工学报 2009年第2期60卷 317-324页

作者：龙学渊杨敏谢云杰罗云重庆科技学院石油工程学院重庆401331 西南油气田分公司输气处四川成都610213

描述天然气在管线中瞬变流动的数学模型为一个非线性双曲守恒律型的非齐次系统,应用时间分裂方法来处理双曲型模型中的非齐次项,对每一个时间步长,时间分裂算法将原来的非齐次双曲型守恒律组转化为一个齐次非线性双曲型守恒律模型和一... 详细信息

描述天然气在管线中瞬变流动的数学模型为一个非线性双曲守恒律型的非齐次系统,应用时间分裂方法来处理双曲型模型中的非齐次项,对每一个时间步长,时间分裂算法将原来的非齐次双曲型守恒律组转化为一个齐次非线性双曲型守恒律模型和一个常微分方程(ODE)。应用显式5点二阶精度的TVD格式求解齐次非线性双曲型守恒律模型,结合具有2阶精度的3点Lax-Wendroff格式计算与边界点相邻节点(第2点,第N-1点)的物理量;并用特征线法处理管线入口和出口处的各类边界条件。通过下游阀门突然关闭的这种极端情况和一条实际天然气管线进行瞬变流动测试TVD/LW混合格式的模拟瞬变流动的有效性,模拟结果表明,TVD/LW混合格式能成功地模拟各物理量在瞬变过程中的真实情况。

关键词：混合格式双曲守恒律天然气管线瞬变流动 TVD格式波动

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基于Fluent分析大口径涡流管节流效果

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真空科学与技术学报 2023年第2期43卷 156-162页

作者：王杰田园陈长江陆梅龙学渊李亚茜中国石化西北油田分公司采油一厂新疆841600 重庆科技学院重庆401331 中国石化西北油田分公司采油二厂新疆841604 中国石化西南油气分公司成都610051

为了验证涡流管节流效果,建立物理模型,采用理想气体甲烷为计算工质,基于Fluent模拟得到流场内物性参数变化规律。分析发现:冷流率0.5时,甲烷(298 K、12 MPa)在涡流管中高速旋转流动,外旋气体紧贴管壁流至热端出口,温度上升至303 K,内... 详细信息

为了验证涡流管节流效果,建立物理模型,采用理想气体甲烷为计算工质,基于Fluent模拟得到流场内物性参数变化规律。分析发现:冷流率0.5时,甲烷(298 K、12 MPa)在涡流管中高速旋转流动,外旋气体紧贴管壁流至热端出口,温度上升至303 K,内旋气体围绕轴心流至冷端出口,温度下降为293 K;外旋高温气体包裹内旋低温气体流动,可有效缓解管壁结晶,避免气体冻堵问题;轴向位置产生压力滞止点和速度方向折点,沿流动方向,内外旋流气体存在能量损耗,造成压力和速度均减小。节流区间3 MPa左右,忽略传热损失,涡流管合流后气体温降区间几乎为0 K,而节流阀温降区间为9.8 K。组建以节流阀和涡流管为关键设备的节流降压工艺流程对比发现:涡流管能量分离效应优于节流阀节流效应,不仅缩小气体温降区间,而且节流效果明显,在实际应用中可简化输气站节流工艺流程,降低投资和运行成本。

关键词：大口径涡流管节流降压数值模拟流动分析

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塔河油田稠油替喷工艺

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油气井测试 2009年第6期18卷 54-56页

作者：倪杰龙学渊西南分公司工程技术研究院四川德阳618000 重庆科技学院石油工程学院重庆400042

塔河油田的稠油埋深在5400 m以下,属正常温度压力系统。稠油在油藏条件下具有一定的流动性和较好的供油能力,但进入井筒后,随着井筒温度的降低,在距井口3000 m左右逐渐失去流动性,原油无法流到井口。针对塔河油田的实际,采用掺稀油井筒... 详细信息

塔河油田的稠油埋深在5400 m以下,属正常温度压力系统。稠油在油藏条件下具有一定的流动性和较好的供油能力,但进入井筒后,随着井筒温度的降低,在距井口3000 m左右逐渐失去流动性,原油无法流到井口。针对塔河油田的实际,采用掺稀油井筒降粘方法,配合常规完井替喷管柱和配压完井替喷管柱,较好的解决了稠油替喷开采的技术难题。

关键词：塔河油田稠油油藏井筒降粘替喷

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