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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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A Simple yet Effective Framework for Active Learning to Rank

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Machine Intelligence Research 2024年第1期21卷 169-183页

作者： Qingzhong Wang Haifang Li Haoyi Xiong wen Wang Jiang Bian Yu Lu Shuaiqiang Wang Zhicong cheng Dejing Dou Dawei Yin Baidu Incorporated Beijing 100085China

While China has become the largest online market in the world with approximately 1 billion internet users,Baidu runs the world's largest Chinese search engine serving more than hundreds of millions of daily active users and responding to billions of queries per *** handle the diverse query requests from users at the web-scale,Baidu has made tremendous efforts in understanding users'queries,retrieving relevant content from a pool of trillions of webpages,and ranking the most relevant webpages on the top of the *** the components used in Baidu search,learning to rank(LTR)plays a critical role and we need to timely label an extremely large number of queries together with relevant webpages to train and update the online LTR *** reduce the costs and time con-sumption of query/webpage labelling,we study the problem of active learning to rank(active LTR)that selects unlabeled queries for an-notation and training in this ***,we first investigate the criterion-Ranking entropy(RE)characterizing the entropy of relevant webpages under a query produced by a sequence of online LTR models updated by different checkpoints,using a query-by-com-mittee(QBC)***,we explore a new criterion namely prediction variances(PV)that measures the variance of prediction res-ults for all relevant webpages under a *** empirical studies find that RE may favor low-frequency queries from the pool for la-belling while PV prioritizes high-frequency queries ***,we combine these two complementary criteria as the sample selection strategies for active *** experiments with comparisons to baseline algorithms show that the proposed approach could train LTR models to achieve higher discounted cumulative gain(i.e.,the relative improvement DCG4=1.38%)with the same budgeted labellingefforts.

关键词： Search information retrieval learning to rank active learning query by committee

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含钴转炉渣非熔融选择性还原回收钴

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中国有色金属学报 2023年第3期33卷 873-885页

作者：张文娟文培成朱纪念陈国举车键勇陈军夏柳王成彦北京科技大学冶金与生态工程学院北京100083 镍钴资源综合利用国家重点实验室金昌737100

钴多以伴生元素赋存于硫化铜镍矿床中,在冶炼过程中主要富集于转炉渣中。从转炉渣中回收钴,能够缓解我国钴的供需矛盾,具有显著的经济和社会效益。本文针对镍转炉的物相组成进行了系统分析,并在此基础上通过热力学分析及实验研究,实现... 详细信息

钴多以伴生元素赋存于硫化铜镍矿床中,在冶炼过程中主要富集于转炉渣中。从转炉渣中回收钴,能够缓解我国钴的供需矛盾,具有显著的经济和社会效益。本文针对镍转炉的物相组成进行了系统分析,并在此基础上通过热力学分析及实验研究,实现了非熔融状态下钴、镍等氧化物的还原及富集。考察了焙烧温度、还原时间、无烟煤及氯化钙用量对各金属回收率及磁选精矿中金属含量的影响。结果表明:优化工艺条件为还原温度1050~1150℃、无烟煤用量(质量分数)10%、氯化钙用量13%、还原时间为1.5 h。在此条件下,铁、钴、镍、铜的回收率分别为51.85%、93.81%、98.32%、76.47%,在磁选精矿中的含量(质量分数)分别为45.08%、8.14%、18.70%、2.06%。

关键词：含钴转炉渣非熔融还原氯化钙钴回收

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Bone marrow mesenchymal stem cells in treatment of peripheral nerve injury

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World Journal of Stem Cells 2024年第8期16卷 799-810页

作者： Xiong-Fei Zou Bao-Zhong Zhang wen-Wei Qian Florence Mei cheng Department of Orthopedic Surgery Peking Union Medical College HospitalBeijing 100730China College of Nursing The Ohio State UniversityOhioOH 43210United States

Peripheral nerve injury(PNI)is a common neurological disorder and complete functional recovery is difficult to *** recent years,bone marrow mesenchymal stem cells(BMSCs)have emerged as ideal seed cells for PNI treatment due to their strong differentiation potential and autologous trans-plantation *** review aims to summarize the molecular mechanisms by which BMSCs mediate nerve repair in *** key mechanisms discussed include the differentiation of BMSCs into multiple types of nerve cells to promote repair of nerve *** also create a microenvironment suitable for neuronal survival and regeneration through the secretion of neurotrophic factors,extracellular matrix molecules,and adhesion ***,BMSCs release pro-angiogenic factors to promote the formation of new blood *** modulate cytokine expression and regulate macrophage polarization,leading to ***,BMSCs synthesize and release proteins related to myelin sheath formation and axonal regeneration,thereby promoting neuronal repair and ***,this review explores methods of applying BMSCs in PNI treatment,including direct cell trans-plantation into the injured neural tissue,implantation of BMSCs into nerve conduits providing support,and the application of genetically modified BMSCs,among *** findings confirm the potential of BMSCs in treating ***,with the development of this field,it is crucial to address issues related to BMSC therapy,including establishing standards for extracting,identifying,and cultivating BMSCs,as well as selecting application methods for BMSCs in PNI such as direct transplantation,tissue engineering,and genetic *** these issues will help translate current preclinical research results into clinical practice,providing new and effective treatment strategies for patients with PNI.

关键词： Bone marrow mesenchymal stem cells Peripheral nerve injury Schwann cells Myelin sheath Tissue engineering

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DNA of neutrophil extracellular traps promote NF-κBdependent autoimmunity via cGAS/TLR9 in chronic obstructive pulmonary disease

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Signal Transduction and Targeted Therapy 2024年第7期9卷 3040-3055页

作者： Jun Chen Tao Wang Xiaoou Li Lijuan Gao Ke Wang Mengxin cheng Zijian Zeng Lei Chen Yongchun Shen Fuqiang wen Department of Respiratory and Critical Care Medicine West China HospitalWest China School of Medicineand Division of Pulmonary DiseasesState Key Laboratory of BiotherapySichuan UniversityChengduSichuan 610041China

Chronic obstructive pulmonary disease(COPD)is characterised by persistent airway inflammation even after cigarette smoking *** extracellular traps(NETs)have been implicated in COPD severity and acute airway inflammation induced by short-term cigarette smoke(CS).However,whether and how NETs contribute to sustained airway inflammation in COPD remain *** study aimed to elucidate the immunoregulatory mechanism of NETs in COPD,employing human neutrophils,airway epithelial cells(AECs),dendritic cells(DCs),and a long-term CS-induced COPD mouse model,alongside cyclic guanosine monophosphate-adenosine monophosphate synthase and toll-like receptor 9 knockout mice(cGAS-^(−/−)TLR9^(−/−));Additionally,bronchoalveolar lavage fluid(BALF)of COPD patients was *** from COPD patients released greater cigarette smoke extract(CSE)-induced NETs(CSE-NETs)due to mitochondrial respiratory chain *** CSE-NETs,containing oxidatively-damaged DNA(NETs-DNA),promoted AECs proliferation,nuclear factor kappa B(NF-κB)activation,NF-κB-dependent cytokines and type-I interferons production,and DC maturation,which were ameliorated/reversed by silencing/inhibition of cGAS/*** the COPD mouse model,blocking NETs-DNA-sensing via cGAS^(−/−)and TLR9^(−/−)mice,inhibiting NETosis using mitoTEMPO,and degrading NETs-DNA with DNase-I,respectively,reduced NETs infiltrations,airway inflammation,NF-κB activation and NF-κBdependent cytokines,but not type-I interferons due to IFN-α/βreceptor *** NETs components(myeloperoxidase and neutrophil elastase activity)in BALF of COPD smokers correlated with disease severity and NF-κB-dependent cytokine levels,but not type-I interferon *** conclusion,NETs-DNA promotes NF-κB-dependent autoimmunity via cGAS/TLR9 in long-term CS exposure-induced ***,targeting NETs-DNA and cGAS/TLR9 emerges as a potential strategy to alleviate persistent airway inflammation in COPD.

关键词： inflammation TLR9 neutrophil

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Low-temperature-pyrolysis preparation of nanostructured graphite towards rapid potassium storage with high initial Coulombic efficiency

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Nano Research 2024年第6期17卷 5138-5147页

作者： Jingke Ren Boyu Xing wen Luo Binyang Luo Xinfei Wu Xin Yan wencong Feng Feiyue Wang Chaojie cheng Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Physics School of ScienceWuhan University of TechnologyWuhan 430070China

Industrially prepared artificial graphite(AG)is attractive for potassium-ion batteries(PIBs),but its rate performance is poor and the production process is energy intensive,so developing an efficient strategy to produce novel graphite with low energy consumption and high performance is economically ***,a nanostructured graphite composed of multi-walled carbon nanotubes(MWCNTs)and graphite shells was prepared by one-pot method through low-temperature pyrolysis of iron-based metal-organic framework(MOF)and carbon *** high graphitization degree of nanostructured graphite makes the initial Coulombic efficiency(ICE)exceed 80%,and the three-dimensional(3D)conductive network ensures a specific capacity of 234 mAh·g^(−1)after 1000 cycles at a high current density of 500 mA·g^(−1).In addition,the typical graphite potassium storage mechanism is also demonstrated by in situ X-ray diffraction(XRD)and in situ Raman spectroscopy,and its practicality is also proved by the voltage of the full *** work provides a feasible way to optimize the practical production process of AG and expand its application in energy storage.

关键词： graphite anode potassium-ion batteries high graphitization degree low-temperature pyrolysis initial Coulombic efficiency

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Perforated gastric ulcer causing mediastinal emphysema: A case report

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World Journal of Clinical Cases 2024年第4期12卷 859-864页

作者： Zhi-cheng Dai Xun-Wu Gui Feng-He Yang Hao-Yuan Zhang wen-Feng Zhang Department of General Surgery Mengcheng County First People's HospitalMengcheng 233500Anhui ProvinceChina Department of Medical Imaging Mengcheng County First People's HospitalMengcheng 233500Anhui ProvinceChina

BACKGROUND Mediastinal emphysema is a condition in which air enters the mediastinum between the connective tissue spaces within the pleura for a variety of *** can be spontaneous or secondary to chest trauma,esophageal perforation,medi-cally induced factors,*** common symptoms are chest pain,tightness in the chest,and respiratory *** mediastinal emphysema patients have mild symptoms,but severe mediastinal emphysema can cause respiratory and circulatory failure,resulting in serious *** SUMMARY A 75-year-old man,living alone,presented with sudden onset of severe epigastric pain with chest tightness after drinking *** to the remoteness of his residence and lack of neighbors,the patient was found by his nephew and brought to the hospital the next morning after the disease *** tomography(CT)showed free gas in the abdominal cavity,mediastinal emph-ysema,and subcutaneous *** gastrointestinal angiography showed that the esophageal mucosa was intact and the gastric antrum was ***,we chose to perform open gastric perforation repair on the patient under thoracic epidural anesthesia combined with intravenous *** operative incision of the muscle layer of the patient's abdominal wall was made,and a large amount of subperitoneal gas was *** a continued incision of the peritoneum revealed the presence of a perforation of approx-imately 0.5 cm in the gastric antrum,which we repaired after pathological ***,the patient received high-flow oxygen and cough *** CT was performed on the first and sixth postoperative days,and the mediastinal and subcutaneous gas was gradually *** After gastric perforation,a large amount of free gas in the abdominal cavity can reach the mediastinum through the loose connective tissue at the esophageal hiatus of the diaphragm,and upper gastrointestinal angiography can clarify the site of *** pat

关键词： Gastric ulcer Perforated Mediastinal emphysema Case report

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Elucidating the cardioprotective mechanisms of sodium-glucose cotransporter-2 inhibitors beyond glycemic control

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World Journal of Diabetes 2024年第2期15卷 137-141页

作者： Ke-Xin Zhang cheng-Xia Kan Fang Han Jing-wen Zhang Xiao-Dong Sun Department of Endocrinology and Metabolism Affiliated Hospital of Weifang Medical UniversityWeifang 261031Shandong ProvinceChina

Sodium-glucose cotransporter-2(SGLT2)inhibitors have emerged as a pivotal intervention in diabetes management,offering significant cardiovascular ***,in particular,has demonstrated cardioprotective effects beyond its glucose-lowering action,reducing heart failure hospitalizations and improving cardiac *** note,the cardioprotective mechanisms appear to be independent of glucose lowering,possibly mediated through several mechanisms involving shifts in cardiac metabolism and anti-fibrotic,anti-inflammatory,and anti-oxidative *** editorial summarizes the multifaceted cardiovascular advantages of SGLT2 inhibitors,highlighting the need for further research to elucidate their full therapeutic potential in cardiac care.

关键词： Diabetes Sodium-glucose cotransporter-2 Cardiovascular diseases Empagliflozin

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Research on groundwater ecological environment mapping based on ecological service function:A case study of five Central Asian countries and neighboring regions of China

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Journal of Groundwater Science and Engineering 2024年第3期12卷 339-346页

作者： Li-qiang Ge Yan-pei cheng Qing Yi Xue-ru wen Hua Dong Kun Liu Jian-kang Zhang National Research Center for Geoanalysis Beijig 100037.China Institute of Hydrogeologv and Environimental Geology Chinese Academy of Geological SciencesShijiazhuang 050061China

The groundwater system is a unique ecosystem that serves both resource and ecological *** have conducted extensive theoretical research and practical work on groundwater ecological *** paper,based on the study of groundwater resources and surface ecology in the five Central Asian countries and adjacent areas of China,introduces the concept of ecosystem service *** establishes a groundwater ecological zoning index system and conducts research of ecological mapping using the five Central Asian countries and adjacent areas of China as *** this process,the ecosystem service functions of groundwater can be more comprehensively reflected,which can better guide regional geological environment protection and industrial *** approach helps coordinate the relationship between socio-economic development and water resource protection,maintain the health of the groundwater ecological environment,enhance the value of groundwater ecological services,and promote the sustainable development of regional economies and societies.

关键词： Groundwater ecosystem Groundwater ecological service Ecological zoning of groundwater Five Central Asian countries

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Triple reverse order law for the Drazin inverse

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Applied Mathematics(A Journal of Chinese Universities) 2024年第1期39卷 55-68页

作者： WANG Hua ZHONG cheng-cheng College of Sciences Inner Mongolia University of TechnologyHohhot 010051China College of Engineering University of Jinan Quancheng CollegeYantai 265600China

In this paper,we investigate the reverse order law for Drazin inverse of three bound-ed linear operators under some commutation ***,the Drazin invertibility of sum is also obtained for two bounded linear operators and... 详细信息

关键词： Drazin inverse reverse order law space decomposition

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