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Chemical modification of barite for improving the performance of weighting materials for water-based drilling fluids

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Petroleum Science 2024年第1期21卷 551-566页

作者： Li-Li Yang Ze-Yu Liu Shi-bo Wang xian-bo He Guan-Cheng Jiang Jie Zhang MOE Key Laboratory of Petroleum Engineering State Key Laboratory of Petroleum Resources and ProspectingChina University of Petroleum(Beijing)Changping DistrictBeijing102249China MOE Key CNPC Drilling Research Institute Changping DistrictBeijing102206China

With increasing drilling depth and large dosage of weighting materials,drilling fluids with high solid content are characterized by poor stability,high viscosity,large water loss,and thick mud cake,easier leading to reservoir damage and wellbore *** this paper,micronized barite(MB)was modified(mMB)by grafting with hydrophilic polymer onto the surface through the free radical polymerization to displace conventional API barite *** suspension stability of water-based drilling fluids(WBDFs)weighted with API barite:mMB=2:1 in 600 g was significantly enhanced compared with that with API barite/WBDFs,exhibiting the static sag factor within 0.54 and the whole stability index of *** viscosity and yield point reached the minimum,with a reduction of more than 40%compared with API barite only at the same *** multi-stage filling and dense accumulation of weighting materials and clays,filtration loss was decreased,mud cake quality was improved,and simultaneously it had great reservoir protection performance,and the permeability recovery rate reached 87%.In addition,it also effectively improved the lubricity of *** sticking coefficient of mud cake was reduced by 53.4%,and the friction coefficient was ***,mMB can serve as a versatile additive to control the density,rheology,filtration,and stability of WBDFs weighted with API barite,thus regulating comprehensive performance and achieving reservoir protection *** work opened up a new path for the productive drilling of extremely deep and intricate wells by providing an efficient method for managing the performance of high-density WBDFs.

关键词： Drilling fluids Weighting materials Filtration control Reservoir protection Stability property

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Exploring the Interplay between Local Chain Structure and Stress Distribution in Polymer Networks

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Chinese Journal of Polymer Science 2024年第6期42卷 874-885页

作者： Jin-Tong Xue Yang Bai Li Peng xian-bo Huang Zhao-Yan Sun School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei230026China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China National-certified Enterprise Technology Center Kingfa Science and Technology Co.Ltd.Guangzhou510663China

The mechanical behavior of polymer networks is intrinsically correlated with the local chain topology and chain *** this study,we delve into this relationship through the lens of coarse-grained molecular dynamics(CG-MD)*** aim is to illuminate the intricate interplay between local topology and stress distribution within polymer monomers,cross-linkers,and various components with distinct cross-link connections,thereby elucidating their collective impact on the mechanical properties of polymer *** mainly focus on how specific local structures contribute to the overall mechanical response of the *** particular,we employ local stress analysis to unravel the mechanics of these *** findings reveal the diverse responses of individual components,such as junctions,strands,cross-linkers between junctions,and dangling chain ends,when subjected to ***,we observe that these components exhibit varying degrees of deformation tolerance,underscoring the significance of their roles in determining the mechanical characteristics of the *** investigations highlight junctions as primary contributors to stress accumulation,and particles with higher local stress showing a stronger correlation between stress and Voronoi ***,our results indicate that both strands and cross-linkers between junctions exhibit heightened stress levels as strand lengths *** study enhances our understanding of the multifaceted factors governing the mechanical attributes of cross-linked polymer systems at the microstructural level.

关键词： Local chain structure Local stress Molecular dynamics simulation

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Effects of exercise training on glucose metabolism indicators and inflammatory markers in obese children and adolescents:A metaanalysis

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World Journal of Diabetes 2024年第6期15卷 1353-1366页

作者： Le-Yang Li Song-Mei Li bo-xian Pang Jun-Ping Wei Qiu-Hong Wang Department of Endocrinology Guang’anmen HospitalChina Academy of Chinese Medical SciencesBeijing 100053China Graduate School Beijing University of Chinese MedicineBeijing 100029China

BACKGROUND Obesity in children and adolescents is a serious problem,and the efficacy of exercise therapy for these patients is *** To assess the efficacy of exercise training on overweight and obese children based on glucose metabolism indicators and inflammatory *** The PubMed,Web of Science,and Embase databases were searched for randomized controlled trials related to exercise training and obese children until October *** meta-analysis was conducted using RevMan 5.3 software to evaluate the efficacy of exercise therapy on glucose metabolism indicators and inflammatory markers in obese *** In total,1010 patients from 28 studies were *** therapy reduced the levels of fasting blood glucose(FBG)[standardized mean difference(SMD):-0.78;95%confidence interval(CI):-1.24 to-0.32,P=0.0008],fasting insulin(FINS)(SMD:-1.55;95%CI:-2.12 to-0.98,Pbolism by reducing levels of FBG,FINS,HOMA-IR,as well as improves inflammatory status by reducing levels of IL-6,CRP,leptin,and increasing levels of adiponectin in overweight and obese *** was no statistically significant effect between exercise training and levels of TNF-α.Additional long-term trials should be conducted to explore this therapeutic perspective and confirm these results.

关键词： Exercise training Obesity Children and adolescents Glucose metabolism Inflammatory markers Meta-analysis

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sTREM-1 as promising prognostic biomarker for acute-on-chronic liver failure and mortality in patients with acute decompensation of cirrhosis

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World Journal of Gastroenterology 2024年第9期30卷 1177-1188页

作者： Song-Man Yu Hai Li Guo-Hong Deng xian-bo Wang Xin Zheng Jin-Jun Chen Zhong-Ji Meng Yu-Bao Zheng Yan-Hang Gao Zhi-Ping Qian Feng Liu Xiao-bo Lu Yu Shi Jia Shang Ruo-Chan Chen Yan Huang Department of Infectious Diseases Xiangya HospitalCentral South UniversityChangsha 410000Hunan ProvinceChina Department of Gastroenterology Renji HospitalShanghai Jiao Tong University School of MedicineShanghai 200127China Department of Infectious Diseases Southwest HospitalThird Military Medical University(Army Medical University)Chongqing 400038China Center of Integrative Medicine Beijing Ditan HospitalCapital Medical UniversityBeijing 100020China Department of Infectious Diseases Institute of Infection and ImmunologyUnion HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430020Hubei ProvinceChina Department of Infectious Diseases Nanfang HospitalSouthern Medical UniversityGuangzhou 510515Guangdong ProvinceChina Department of Infectious Disease Taihe HospitalHubei University of MedicineShiyan 442009Hubei ProvinceChina Department of Infectious Diseases The Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510630Guangdong ProvinceChina Department of Hepatology The First Hospital of Jilin UniversityChangchun 130021Jilin ProvinceChina Department of Liver Intensive Care Unit Shanghai Public Health Clinical CentreFudan UniversityShanghai 200093China Tianjin Institute of Hepatology Nankai University Second People's HospitalTianjin 300192China Infectious Disease Center The First Affiliated Hospital of Xinjiang Medical UniversityUrumqi 830054Xinjiang Uygur Autonomous RegionChina The State Key Laboratory for Diagnosis and Treatment of Infectious Diseases The First Affiliated Hospital of School of MedicineZhejiang UniversityHangzhou 310003Zhejiang ProvineChina Department of Infectious Diseases Henan Provincial People's HospitalZhengzhou 463599Henan ProvineChina Department of Infectious Diseases Hunan Key Laboratory of Viral HepatitisXiangya HospitalCentral South UniversityChangsha 110051Hunan ProvineChina

BACKGROUND Acute decompensation(AD)of cirrhosis is associated with high short-term mortality,mainly due to the development of acute-on-chronic liver failure(ACLF).Thus,there is a need for biomarkers for early and accurate identification of AD patients with high risk of development of ACLF and *** triggering receptor expressed on myeloid cells-1(sTREM-1)is released from activated innate immune cells and correlated with various inflammatory *** To explore the prognostic value of sTREM-1 in patients with AD of *** A multicenter prospective cohort of 442 patients with cirrhosis hospitalized for AD was divided into a study cohort(n=309)and validation cohort(n=133).Demographic and clinical data were collected,and serum sTREM-1 was measured at *** enrolled patients were followed-up for at least 1 *** In patients with AD and cirrhosis,serum sTREM-1 was an independent prognosis predictor for 1-year survival and correlated with liver,coagulation,cerebral and kidney failure.A new prognostic model of AD(P-AD)incorporating sTREM-1,blood urea nitrogen(BUN),total bilirubin(TBil),international normalized ratio(INR)and hepatic encephalopathy grades was established and performed better than the model for end-stage liver disease(MELD),MELD-sodium(MELD-Na),chronic liver failure-consortium(CLIF-C)ACLF and CLIF-C AD ***,sTREM-1 was increased in ACLF and predicted the development of ACLF during first 28-d *** ACLF risk score incorporating serum sTREM-1,BUN,INR,TBil and aspartate aminotransferase levels was established and significantly superior to MELD,MELD-Na,CLIF-C ACLF,CLIF-C AD and P-AD in predicting risk of ACLF *** Serum sTREM-1 is a promising prognostic biomarker for ACLF development and mortality in patients with AD of cirrhosis.

关键词： Soluble triggering receptor expressed on myeloid cell-1 Acute decompensation Cirrhosis Acute-on-chronic liver failure Prognostic biomarker

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数字经济创新、劳动力非农就业与共同富裕

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技术经济与管理研究 2024年第8期 40-45页

作者：聂贤波中国社会科学院大学商学院北京102401

将数字经济创新纳入共同富裕分析框架,选取2012—2022年中国省级面板数据,实证检验数字经济创新对共同富裕的影响机制。结果表明,数字经济创新对共同富裕具有显著正向影响,且该影响效应在数字基础设施建设高水平地区更强。机制检验表明... 详细信息

将数字经济创新纳入共同富裕分析框架,选取2012—2022年中国省级面板数据,实证检验数字经济创新对共同富裕的影响机制。结果表明,数字经济创新对共同富裕具有显著正向影响,且该影响效应在数字基础设施建设高水平地区更强。机制检验表明,劳动力非农就业是数字经济创新促进共同富裕的重要渠道。鉴于此,应以创新驱动为牵引,推动数字经济高质量发展;以非农就业为渠道,助力共同富裕取得新成效;因地制宜,实现数字经济统筹协调,以期更好释放数字经济创新红利,推动共同富裕不断取得新成效。

关键词：数字经济创新共同富裕劳动力非农就业中国式现代化

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涓滴还是虹吸——基于流动人口与城镇人口消费关系的研究

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中山大学学报（社会科学版） 2024年第2期64卷 55-66页

作者：周先波吴英明中山大学岭南学院广州510275

中国流动人口消费低迷的问题由来已久。理解流动人口的消费行为是改善中国消费不足、减少消费不平等的关键,对畅通国内大循环以及推进共同富裕具有重要的现实意义。利用中国家庭收入调查(CHIP)数据,实证研究流动人口内部、城镇人口内部... 详细信息

中国流动人口消费低迷的问题由来已久。理解流动人口的消费行为是改善中国消费不足、减少消费不平等的关键,对畅通国内大循环以及推进共同富裕具有重要的现实意义。利用中国家庭收入调查(CHIP)数据,实证研究流动人口内部、城镇人口内部以及两者间的消费联系。结果表明,城镇人口内部高收入群体对低收入群体有显著的消费涓滴影响,但这种影响在流动人口内部不明显;不过,城镇人口的消费增加对流动人口的消费具有虹吸效应。虹吸效应的机制研究表明,流动人口社会网络的缩减会降低他们应对风险的能力,从而增加储蓄和减少消费;同时,地位追赶动机促使流动人口积累财富,从而减少当前的消费。虹吸效应的发现意味市场难以自发改善城-流人口间的消费不平等状况。为实现共同富裕及高质量发展,政府不能完全放任市场在逐利的动机下自行运转。

关键词：流动人口城镇人口涓滴消费虹吸消费

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《尔雅翼》所述饮食价值论析

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新余学院学报 2024年第1期29卷 66-71页

作者：陈波先豫章师范学院文化与旅游学院江西南昌330103

《尔雅翼》是南宋的一部名物训诂著作。此书以详述草木虫鱼鸟兽的特性及辨析它们的异同为主,但也论述了有关草木虫鱼鸟兽的性味及食物的种类、烹饪的方法,记述了南宋的饮食风俗等。从饮食视角分析《尔雅翼》中有关饮食的论述,揭示《尔... 详细信息

《尔雅翼》是南宋的一部名物训诂著作。此书以详述草木虫鱼鸟兽的特性及辨析它们的异同为主,但也论述了有关草木虫鱼鸟兽的性味及食物的种类、烹饪的方法,记述了南宋的饮食风俗等。从饮食视角分析《尔雅翼》中有关饮食的论述,揭示《尔雅翼》中的饮食文化,可为学术界研究南宋的饮食史提供学术参考,亦可为研究中华饮食文化提供实证材料。

关键词：《尔雅翼》饮食食物风俗

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基于小波分析的风电机组齿轮箱振动信号识别方法设计

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机械管理开发 2024年第5期39卷 146-147,163页

作者：咸博太原重工股份有限公司山西太原030051

以小波分析为核心,研究了一种新型风电机组齿轮箱振动信号识别方法。通过对风电机组齿轮箱振动信号进行小波变换,能有效地提取信号中关键特征,并利用这些特征进行故障诊断。结果表明,该方法能显著提高齿轮箱故障识别的准确率和可靠性,... 详细信息

以小波分析为核心,研究了一种新型风电机组齿轮箱振动信号识别方法。通过对风电机组齿轮箱振动信号进行小波变换,能有效地提取信号中关键特征,并利用这些特征进行故障诊断。结果表明,该方法能显著提高齿轮箱故障识别的准确率和可靠性,为风电机组的维护与优化提供了新技术途径。

关键词：小波分析风电机组齿轮箱振动信号

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考虑疲劳载荷分布的海上风电机组出力优化控制

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机械管理开发 2024年第6期39卷 167-169页

作者：咸博太原重工股份有限公司山西太原030051

为提高海上风电机组的能源产出效率。延长风电机组运行寿命,研究着重考虑了疲劳载荷分布影响。采用集成气象数据与疲劳载荷模拟方法,设计了一种出力优化控制模型。并通过优化算法选择与参数调优来提升控制模型功能,旨在全方位提升能源... 详细信息

为提高海上风电机组的能源产出效率。延长风电机组运行寿命,研究着重考虑了疲劳载荷分布影响。采用集成气象数据与疲劳载荷模拟方法,设计了一种出力优化控制模型。并通过优化算法选择与参数调优来提升控制模型功能,旨在全方位提升能源产出效率,减轻疲劳载荷对设备的潜在损害,研究结果显示,出力优化控制模型能提高海上风电场的整体效率,有效延长风电机组使用寿命,可为提升海上风能的经济性与可持续性贡献了新方法。

关键词：海上风电机组疲劳载荷物理模型参数调优控制模型

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大模型在军事垂直领域的应用

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舰船科学技术 2024年第5期46卷 171-175页

作者：蔡磊孟宪波韩冬梅肖振华中国船舶集团有限公司第七一四研究所北京100101

大模型技术是人工智能技术的飞跃式发展,使得大众看到人工智能的切实应用,利用大模型技术开展垂直领域应用是目前的研究热点,针对军事垂直领域的行业特点,本文提出一种基于开源大模型训练军事垂域大模型的技术路线。

关键词：大模型军事应用

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