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Data-driven Wasserstein distributionally robust chance-constrained optimization for crude oil scheduling under uncertainty

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Chinese Journal of Chemical Engineering 2024年第5期69卷 152-166页

作者： Xin Dai liang Zhao Renchu He Wenli Du weimin Zhong Zhi Li Feng Qian Key Laboratory of Smart Manufacturing in Energy Chemical Process Ministry of EducationEast China University of Science and TechnologyShanghai 200237China Engineering Research Center of Process System Engineering Ministry of EducationEast China University of Science and TechnologyShanghai 200237China

Crude oil scheduling optimization is an effective method to enhance the economic benefits of oil refining.But uncertainties,including uncertain demands of crude distillation units(CDUs),might make the production plans made by the traditional deterministic optimization models infeasible.A data-driven Wasserstein distributionally robust chance-constrained(WDRCC)optimization approach is proposed in this paper to deal with demand uncertainty in crude oil scheduling.First,a new deterministic crude oil scheduling optimization model is developed as the basis of this approach.The Wasserstein distance is then used to build ambiguity sets from historical data to describe the possible realizations of probability distributions of uncertain demands.A cross-validation method is advanced to choose suitable radii for these ambiguity sets.The deterministic model is reformulated as a WDRCC optimization model for crude oil scheduling to guarantee the demand constraints hold with a desired high probability even in the worst situation in ambiguity sets.The proposed WDRCC model is transferred into an equivalent conditional value-at-risk representation and further derived as a mixed-integer nonlinear programming counterpart.Industrial case studies from a real-world refinery are conducted to show the effectiveness of the proposed method.Out-of-sample tests demonstrate that the solution of the WDRCC model is more robust than those of the deterministic model and the chance-constrained model.

关键词： Distributions Model Optimization Crude oil scheduling Wasserstein distance Distributionally robust chance constraints

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Uncertainty Comparison Between Value-at-Risk and Expected Shortfall

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Communications in Mathematical Research 2024年第1期40卷 102-124页

作者： Qing Liu weimin Liu liang Peng Gengsheng Qin School of Statistics Jjiangxi University of Finance and EconomicsNanchangJiangxi 330013China Department of Mathematics and Statistics Georgia State UniversityAtlantaGA 30303USA Maurice R.Greenberg School of Risk Science Georgia State UniversityAtlantaGA 20303USA

Value-at-Risk(VaR)and expected shortfall(ES)are two key risk measures in financial risk management.Comparing these two measures has been a hot debate,and most discussions focus on risk measure properties.This paper uses independent data and autoregressive models with normal or t-distribution to examine the effect of the heavy tail and dependence on comparing the nonparametric inference uncertainty of these two risk measures.Theoretical and numerical analyses suggest that VaR at 99%level is better than ES at 97.5%level for distributions with heavier tails.

关键词： α-mixing asymptotic variance expected shortfall Value-at-Risk

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Modification of POSS and their tribological properties and resistant to space atomic oxygen irradiation as lubricant additive of multialkylated cyclopentanes

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Friction 2024年第5期12卷 884-896页

作者： Xingwei WANG Chaoyang ZHANG Chen ZHAO Yijing liang Ming ZHANG Wufang YANG Bo YU Qiangliang YU Meirong CAI Feng ZHOU weimin LIU State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou730000China Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Yantai264000China

Developing functional additive resistant to space atomic oxygen(AO)irradiation through simple molecular design and chemical synthesis to enhance the lubricating performance of multialkylated cyclopentanes(MACs)oil is a significant challenge.Herein,sulfur-containing polyhedral oligomere silsesquioxane(POSS)were synthesize via a click-chemistry reaction of octavinyl polyhedral oligomeric with alkyl sulfide.The reduce-friction(RF),anti-wear(AW)properties and anti-AO irradiation of POSS-S-R as MACs base oil additives in atmospheric and simulated space environments were systematically investigated for the first time.Results demonstrate that POSS-S-R not only possesses outstanding anti-AO irradiation capacity but also effectively improves the RF and AW of MACs in atmospheric or simulated space surroundings.This improvement is due to the excellent anti-AO irradiation properties of the POSS structure itself and the high load-carrying ability of silicon-containing and sulfur-containing compounds generated by tribo-chemical reactions,which effectively separates the direct contact of the friction interface.We believe that this synthesized POSS-S-R is a promising additive for space lubricants.

关键词： POSS additive reduce-friction anti-wear multialkylated cyclopentanes(MACs) resistant atomic irradiation

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Oridonin restores hepatic lipid homeostasis in an LXRa-ATGL/EPT1 axis-dependent manner

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Journal of Pharmaceutical Analysis 2023年第11期13卷 1281-1295页

作者： Yulian Chen Huanguo Jiang Zhikun Zhan Jindi Lu Tanwei Gu Ping Yu weimin liang Xi Zhang Shilong Zhong Lan Tang NMPA Key Laboratory for Research and Evaluation of Drug Metabolism Guangdong Provincial Key Laboratory of New Drug ScreeningSchool of Pharmaceutical SciencesSouthern Medical UniversityGuangzhou510515China Department of Pharmacy Guangdong Provincial People's Hospital(Guangdong Academy of Medical Sciences)Southern Medical UniversityGuangzhou510515China

Hepatosteatosis is characterized by abnormal accumulation of triglycerides(TG),leading to prolonged and chronic inflammatory infiltration.To date,there is still a lack of effective and economical therapies for hepatosteatosis.Oridonin(ORI)is a major bioactive component extracted from the traditional Chinese medicinal herb Rabdosia rubescens.In this paper,we showed that ORI exerted significant protective effects against hepatic steatosis,inflammation and fibrosis,which was dependent on LXRa signaling.It is reported that LXRa regulated lipid homeostasis between triglyceride(TG)and phosphatidylethanolamine(PE)by promoting ATGL and EPT1 expression.Therefore,we implemented the lipidomic strategy and luciferase reporter assay to verify that ORI contributed to the homeostasis of lipids via the regulation of the ATGL gene associated with TG hydrolysis and the EPT1 gene related to PE synthesis in a LXRadependent manner,and the results showed the TG reduction and PE elevation.In detail,hepatic TG overload and lipotoxicity were reversed after ORI treatment by modulating the ATGL and EPT1 genes,respectively.Taken together,the data provide mechanistic insights to explain the bioactivity of ORI in attenuating TG accumulation and cytotoxicity and introduce exciting opportunities for developing novel natural activators of the LXRa-ATGL/EPT1 axis for pharmacologically treating hepatosteatosis and metabolic disorders.

关键词： Oridonin Lipid homeostasis TG reduction PE elevation LXRa-ATGL/EPT1 axis

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街区空间使用后评估的框架与逻辑

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建筑学报 2024年第2期 36-42页

作者：司桂恒庄惟敏梁思思清华大学建筑学院北京100084 清华大学建筑设计研究院有限公司北京100084

聚焦于街区评估指标体系背后的结构与逻辑,基于多指标综合评价理论,对中外前沿的街区评估文献进行整合,总结街区评估的特点,初步重构评估框架,并通过实例验证,提出未来街区评估指标体系的研究方向,为城市设计提供合理前馈,并促进后评估... 详细信息

聚焦于街区评估指标体系背后的结构与逻辑,基于多指标综合评价理论,对中外前沿的街区评估文献进行整合,总结街区评估的特点,初步重构评估框架,并通过实例验证,提出未来街区评估指标体系的研究方向,为城市设计提供合理前馈,并促进后评估与前策划在街区尺度上形成正向反馈闭环。

关键词：街区使用后评估 POE 指标体系评估逻辑

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金融发展对内蒙古进出口贸易影响研究

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开发性金融研究 2024年第1期 39-50页

作者：梁伟民杨帆国家开发银行内蒙古分行营运处内蒙古大学公共管理学院内蒙古财经大学公共管理学院

本文以内蒙古金融发展和对外贸易关系为研究对象,基于呼和浩特、包头等十二个盟、市2015—2022年的面板数据,采用GMM模型和协整回归,通过金融深化和金融效率两个指标,分析金融发展对内蒙古进出口贸易的影响。研究发现,无论短期还是长期... 详细信息

本文以内蒙古金融发展和对外贸易关系为研究对象,基于呼和浩特、包头等十二个盟、市2015—2022年的面板数据,采用GMM模型和协整回归,通过金融深化和金融效率两个指标,分析金融发展对内蒙古进出口贸易的影响。研究发现,无论短期还是长期,金融效率提升对内蒙古进出口贸易均有显著的促进作用。短期中,金融深化对进口也有正向影响。据此,本文建议金融监管机构把握好金融监管的节奏和力度,约束风险的同时提升金融效率;金融机构应盘活不良资产,提高信贷资源使用效率,将信贷投向重点领域、薄弱环节。同时,应降低企业税收负担,扩大直接融资比例,降低融资成本,提高金融服务实体经济质效。

关键词：进出口贸易金融发展金融深化金融效率长短期分析

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低温和含水率对重塑性煤体抗剪强度影响研究

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矿业安全与环保 2024年第2期51卷 127-132,140页

作者：孙修伟梁为民李敏敏岳高伟蔺海晓河南理工大学土木工程学院河南焦作454000

为了研究温度—含水率耦合作用下重塑性煤体抗剪强度的变化规律,保障松软煤层安全高效稳定开采,采用直剪试验分析了重塑性煤体在较低温度(20、0、-10、-20、-30、-40℃)、一定含水率(0、0.8%、4%、8%、12%、16%)耦合作用下的抗剪强度特... 详细信息

为了研究温度—含水率耦合作用下重塑性煤体抗剪强度的变化规律,保障松软煤层安全高效稳定开采,采用直剪试验分析了重塑性煤体在较低温度(20、0、-10、-20、-30、-40℃)、一定含水率(0、0.8%、4%、8%、12%、16%)耦合作用下的抗剪强度特性,并通过数学统计分析了温度与含水率对抗剪强度的影响。研究结果表明:含水率为0时重塑性煤体的黏聚力随着温度的降低呈幂指数增加;温度—含水率耦合作用下重塑性煤体的抗剪强度均与垂向应力成正比,均符合莫尔-库仑准则;在温度为10~20℃、含水率为12%~16%时,黏聚力达到最大值322.9 kPa,最小值138.0 kPa出现在温度-40℃、含水率4%附近;在-20~-40℃温度下,重塑性煤体内摩擦角随含水率的增加逐渐降低至最小值18.25°;当含水率为6%~13%、温度为-20~10℃时,内摩擦角达到最大值31.45°,对应抗剪强度达到最大值。温度—含水率耦合作用下,重塑性煤体抗剪强度、内摩擦角与黏聚力均受温度的影响较大。

关键词：重塑性煤低温含水率抗剪强度黏聚力内摩擦角

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Prevalence and risk evaluation of cardiovascular disease in the newly diagnosed prostate cancer population in China: A nationwide, multi-center, population-based cross-sectional study

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中华医学杂志(英文版) 2024年第11期137卷 2024 Apr 12页

作者： Zhang Weiyu Liu Huixin Liu Ming Ying Shi Yuan Renbin Zeng Hao Zhang Zhenting Han Sujun Si Zhannan Hu Bin Wen Simeng Xu Pengcheng Yu weimin Chen Hui Wang liang Lin Zhitao Dai Tao Lin Yunzhi Xu Tao Hospital Tianjin China Department of Urology Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing China National Cancer Center Beijing China National Clinical Research Center for Cancer Beijing China Department of Urology Liaoning Cancer Hospital Shenyang Liaoning China Department of Urology The Second Hospital of Tianjin Medical University Tianjin China Tianjin Institute of Urology Tianjin Medical University Tianjin China Department of Urology Lu’an Affiliated Hospital of Anhui Medical University Lu’an Anhui China Department of Urology Renmin Hospital of Wuhan University Wuhan Hubei China Department of Urology Harbin Medical University Affiliated Cancer Hospital Harbin Heilongjiang China Department of Urology Peking University People’s Hospital Beijing China Department of Urology The Second Hospital of Dalian Medical University Dalian Liaoning China Department of Urology Surgery Fujian Cancer Hospital Fuzhou Fujian China Department of Urology Surgery Hunan Cancer Hospital Changsha Hunan China Department of Urology Surgery The First Affiliated Hospital of Fujian Medical University Fuzhou Fujian China Department of Clinical Epidemiology and Biostatistics Peking University People’s Hospital Beijing China Department of Urology Beijing Hospital National Center of Gerontology Beijing China Institute of Geriatric Medicine Chinese Academy of Medical Sciences Beijing China Department of Urology Wuhan Union Hospital Huazhong University of Science &amp Technology Wuhan Hubei China Department of Urology The Third People’s Hospital of Chengdu Chengdu Sichuan China Department of Urology West China Hospital of Sichuan University Chengdu Sichuan China Department of Urologic Oncology Tianjin Medical University Cancer Institute &amp

Background: Cardiovascular disease (CVD) has emerged as the leading cause of death from prostate cancer (PCa) in recent decades, bringing a great disease burden worldwide. Men with preexisting CVD have an increased risk for major adverse cardiovascular events when treated with androgen deprivation therapy (ADT). The present study aimed to explore the prevalence and risk evaluation of CVD among people with newly diagnosed PCa in China.Methods: Clinical data of newly diagnosed PCa patients were retrospectively collected from 34 centers in China from 2010 to 2022 through convenience sampling. CVD was defined as myocardial infarction, arrhythmia, heart failure, stroke, ischemic heart disease, and others. CVD risk was estimated by calculating Framingham risk scores (FRS). Patients were accordingly divided into low-, medium-, and high-risk groups.χ2 or Fisher’s exact test was used for comparison of categorical variables.Results: A total of 4253 patients were enrolled in the present study. A total of 27.0% (1147/4253) of patients had comorbid PCa and CVD, and 7.2% (307/4253) had two or more CVDs. The enrolled population was distributed in six regions of China, and approximately 71.0% (3019/4253) of patients lived in urban areas. With imaging and pathological evaluation, most PCa patients were diagnosed at an advanced stage, with 20.5% (871/4253) locally progressing and 20.5% (871/4253) showing metastasis. Most of them initiated prostatectomy (46.6%, 1983/4253) or regimens involving ADT therapy (45.7%, 1944/4253) for prostate cancer. In the present PCa cohort, 43.1% (1832/4253) of patients had hypertension, and half of them had poorly controlled blood pressure. With FRS stratification, as expected, a higher risk of CVD was related to aging and metabolic disturbance. However, we also found that patients with treatment involving ADT presented an originally higher risk of CVD than those without ADT. This was in accordance with clinical practice, i.e., aged patients or patients at advanced oncological stages were inclined to

关键词： Prostate cancer Castration Cardiovascular disease Prevalence Cardiovascular risk

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基于离散时间量子漫步的链路预测算法

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安徽大学学报（自然科学版） 2024年第2期48卷 34-39页

作者：侍伟敏梁佳伟周艺华杨宇光北京工业大学北京可信计算重点实验室北京100124

量子漫步算法能模拟游走粒子在图上的量子相干演化,粒子的运动状态由量子态的相干叠加而成.与经典随机游走算法相比,量子漫步算法具有寻找目标节点时间少和源节点扩散至其他节点时间少的优点.提出一种基于离散时间量子漫步的链路预测(li... 详细信息

量子漫步算法能模拟游走粒子在图上的量子相干演化,粒子的运动状态由量子态的相干叠加而成.与经典随机游走算法相比,量子漫步算法具有寻找目标节点时间少和源节点扩散至其他节点时间少的优点.提出一种基于离散时间量子漫步的链路预测(link predictionbased on discrete time quantum walk,简称LP-DTQW)算法.研究结果表明:相对于其他7种算法,LP-DTQW算法有更高的预测精度;LP-DTQW算法的时间复杂度远低于经典RWR(random walk with restart)链路预测算法的时间复杂度.因此,LP-DTQW算法具有更强的预测性能.

关键词：复杂网络链路预测离散时间量子漫步拓扑相似性

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生料发酵红曲酒的研制

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酿酒 2024年第1期51卷 127-129页

作者：梁超李娜吕伟民黑龙江省轻工科学研究院黑龙江哈尔滨150010

以整粒大米为主要原料,不经过蒸饭或膨化过程,直接接入紫色红曲和酵母菌,经液态同步糖化发酵、固液分离、食用酒精浸提、调配、灭菌,制成具有营养保健功效的红曲酒。这种红曲酒色泽深红,清亮透明,口感醇香,具有红曲独特的风味和营养保... 详细信息

以整粒大米为主要原料,不经过蒸饭或膨化过程,直接接入紫色红曲和酵母菌,经液态同步糖化发酵、固液分离、食用酒精浸提、调配、灭菌,制成具有营养保健功效的红曲酒。这种红曲酒色泽深红,清亮透明,口感醇香,具有红曲独特的风味和营养保健功效。

关键词：红曲保健酒生料发酵浸提

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