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Mean field games of controls:Propagation of monotonicities

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Probability, Uncertainty and Quantitative Risk 2022年第3期7卷 247-274页

作者： Chenchen Mou jianfeng zhang Department of Mathematics City University of Hong KongHong Kong SARChina Department of Mathematics University of Southern CaliforniaLos AngelesCA 90089USA

The theory of Mean Field Game of Controls considers a class of mean field games where the interaction is through the joint distribution of the state and *** is well known that,for standard mean field games,certain monotonicity conditions are crucial to guarantee the uniqueness of mean field equilibria and then the global wellposedness for master *** the literature the monotonicity condition could be the Lasry–Lions monotonicity,the displacement monotonicity,or the anti-monotonicity *** this paper,we investigate these three types of monotonicity conditions for Mean Field Games of Controls and show their propagation along the solutions to the master equations with common *** particular,we extend the displacement monotonicity to semi-monotonicity,whose propagation result is new even for standard mean field *** is the first step towards the global wellposedness theory for master equations of Mean Field Games of Controls.

关键词： Mean field game of controls Master equation Lasry-Lions monotonicity Displacement semi-monotonicity Anti-monotonicity

Highly efficient and selective removal of phosphate from wastewater of sea cucumber aquaculture for microalgae culture using a new adsorption-membrane separation-coordinated strategy

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Frontiers of Environmental Science & Engineering 2023年第10期17卷 27-39页

作者： Aihua zhang Shihao Fang Huan Xi Jianke Huang Yongfu Li Guangyuan Ma jianfeng zhang Jiangsu Province Engineering Research Center for Marine Bio-resources Sustainable Utilization College of OceanographyHohai UniversityNanjing 210098China College of Mechanics and Materials Hohai UniversityNanjing 211100China Jiangsu Innovation Center of Marine Bioresources Jiangsu Coast Development Group Co.Ltd.Nanjing 210019China

Enhanced phosphorus treatment and recovery has been continuously pursued due to the stringent wastewater discharge regulations and a phosphate supply shortage. Here, a new adsorption-membrane separation strategy was developed for rational reutilization of phosphate from sea cucumber aquaculture wastewater using a Zr-modified-bentonite filled polyvinyl chloride membrane. The as-obtained polyvinyl chloride/Zr-modified-bentonite membrane was highly permeability (940 L/(m2·h)), 1–2 times higher than those reported in other studies, and its adsorption capacity was high (20.6 mg/g) when the phosphate concentration in water was low (5 mg/L). It remained stable under various conditions, such as different pH, initial phosphate concentrations, and the presence of different ions after 24 h of adsorption in a cross-flow filtration system. The total phosphorus and phosphate removal rate reached 91.5% and 95.9%, respectively, after the membrane was used to treat sea cucumber aquaculture wastewater for 24 h and no other water quality parameters had been changed. After the purification process, the utilization of the membrane as a new source of phosphorus in the phosphorus-free f/2 medium experiments indicated the high cultivability of economic microalgae Phaeodactylum tricornutum FACHB-863 and 1.2 times more chlorophyll a was present than in f/2 medium. The biomass and lipid content of the microalgae in the two different media were similar. The innovative polyvinyl chloride/Zr-modified-bentonite membrane used for phosphorus removal and recovery is an important instrument to establish the groundwork for both the treatment of low concentration phosphate from wastewater as well as the reuse of enriched phosphorus in required fields.

关键词： Adsorption-membrane Low-concentration phosphate Zr-modified-bentonite Recycle Microalgal culture

碳基GaSn合金负极材料的制备及其电化学性能

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化工新型材料 2024年第10期52卷 90-95页

作者：张剑峰陈玉刘航蔺多佳徐振凯夏鑫新疆大学纺织与服装学院乌鲁木齐830046 东华大学纺织面料技术教育部重点实验室上海201620

为解决锂离子电池负极材料体积膨胀导致电化学性能严重下降的问题,将镓锡(GaSn)液态合金与碳纳米纤维网络相结合作为锂离子电池负极材料。分别通过物理吸附和静电纺丝两种方式将GaSn合金约束或包覆在纳米纤维导电网络中,对材料的形貌、... 详细信息

为解决锂离子电池负极材料体积膨胀导致电化学性能严重下降的问题,将镓锡(GaSn)液态合金与碳纳米纤维网络相结合作为锂离子电池负极材料。分别通过物理吸附和静电纺丝两种方式将GaSn合金约束或包覆在纳米纤维导电网络中,对材料的形貌、结构以及性能进行表征和分析。结果表明:GaSn液态合金通过超声空化效应形成亚微米级合金微球。将GaSn合金吸附在碳纳米纤维膜基底上,合金团聚成大颗粒嵌在纳米纤维网络表面,导致其余合金无法渗透到内部,影响GaSn合金在电化学性能方面的发挥。而将GaSn合金混合静电纺丝、炭化后,大量合金被碳膜包覆,均匀分布在纳米纤维网络中,粒径大小均一,材料在循环过程中由于液态合金良好的自愈合性、流动性以及灵活性,可修复脱嵌锂时产生的破损以及充分紧附纳米纤维导电网络,提高锂离子传输效率。从第2圈充放电循环至100圈后,容量保持率高达93.6%。

关键词：镓锡液态合金自愈合锂离子电池负极材料静电纺丝

基于计算机视觉的钢桁架桥梁梁底病害扫描方法

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上海公路 2024年第3期 79-84,134,M0006页

作者：徐向东唐志张剑锋贵州省交通规划勘察设计研究院股份有限公司贵州贵阳550081

钢桁架桥梁底部由于长期受到自然环境的侵蚀和交通荷载的影响,容易发生锈蚀等现象,若不及时进行检测和维修,可能会导致结构性能下降,甚至发生安全事故。现依托于北盘江大桥,构建了梁底腐蚀典型病害数据集,并基于标准化的图像预处理技术... 详细信息

钢桁架桥梁底部由于长期受到自然环境的侵蚀和交通荷载的影响,容易发生锈蚀等现象,若不及时进行检测和维修,可能会导致结构性能下降,甚至发生安全事故。现依托于北盘江大桥,构建了梁底腐蚀典型病害数据集,并基于标准化的图像预处理技术,通过选取合适的卷积神经网络,实现了病害图像的特征自动提取,同时以机器学习的方式,实现了病害分类,完成了对疑似病害区域的检测。

关键词：梁底检测病害识别深度学习语义分割

Backward stochastic differential equations with Young drift

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Probability, Uncertainty and Quantitative Risk 2017年第1期2卷 112-128页

作者： Joscha Diehl jianfeng zhang Max-Planck Institute for Mathematics in the Sciences LeipzigGermany Department of Mathematics University of Southern CaliforniaLos AngelesCaliforniaUSA

We show the well-posedness of backward stochastic differential equations containing an additional drift driven by a path of finite q-variation with q∈[1,2).In contrast to previous work,we apply a direct fixpoint argument and do not rely on any type of flow *** resulting object is an effective tool to study semilinear rough partial differential equations via a Feynman–Kac type representation.

关键词： Rough paths theory Young integration BSDE rough PDE

Pseudo-Markovian viscosity solutions of fully nonlinear degenerate PPDEs

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Probability, Uncertainty and Quantitative Risk 2016年第1期1卷 218-251页

作者： Ibrahim Ekren jianfeng zhang ETH Department of Mathematics ZurichSwitzerland University of Southern California Department of MathematicsLos AngelesCaliforniaUSA

In this paper,we propose a new type of viscosity solutions for fully nonlinear path-dependent *** restricting the solution to a pseudo-Markovian structure defined below,we remove the uniform non-degeneracy condition needed in our earlier works(Ekren,I,Touzi,N,zhang,J,Ann Probab,44:1212–1253,2016a;Ekren,I,Touzi,N,zhang,J,Ann Probab,44:2507–2553,2016b)to establish the uniqueness *** establish the comparison principle under natural and mild ***,we apply our results to two important classes of PPDEs:the stochastic HJB equations and the path-dependent Isaacs equations,induced from the stochastic optimization with random coefficients and the path-dependent zero-sum game problem,respectively.

关键词： Path dependent PDEs Viscosity solutions Comparison principle Stochastic HJB equations Isaacs equations

From Lung to Brain:Respiration Modulates Neural and Mental Activity

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Neuroscience Bulletin 2023年第10期39卷 1577-1590页

作者： Josh Goheen John A.E.Anderson jianfeng zhang Georg Northof The Royal Ottawa Mental Health Centre The University of OttawaOttawa K1Z 7K4Canada Department of Cognitive Science Carleton UniversityOttawa K1S 5B6Canada Center for Brain Disorders and Cognitive Sciences Shenzhen UniversityShenzhen 518060China School of Psychology Shenzhen UniversityShenzhen 518060China

Respiration protocols have been developed to manipulate mental states,including their use for therapeutic *** this systematic review,we discuss evidence that respiration may play a fundamental role in coordinating neural activity,behavior,and *** main findings are:(1)respiration affects the neural activity of a wide variety of regions in the brain;(2)respiration modulates different frequency ranges in the brain’s dynamics;(3)different respiration protocols(spontaneous,hyperventilation,slow or resonance respiration)yield different neural and mental effects;and(4)the effects of respiration on the brain are related to concurrent modulation of biochemical(oxygen delivery,pH)and physiological(cerebral blood flow,heart rate variability)*** conclude that respiration may be an integral rhythm of the brain’s neural *** provides an intimate connection of respiration with neuro-mental features like emotion.A respiratory-neuro-mental connection holds the promise for a brain-based therapeutic usage of respiration in mental disorders.

关键词： Respiration Cognition Emotion Heart rate variability Carbon dioxide

一株猪流行性腹泻病毒的分离鉴定及其ORF3和S基因序列分析

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黑龙江畜牧兽医 2024年第2期 79-87页

作者：沈海燕黄俊张琬玓聂晶晶瞿云芝张建峰李智丽张春红广东省农业科学院动物卫生研究所/农业农村部兽用药物与诊断技术广东科学观测实验站/广东省畜禽疫病防治研究重点实验室广州510640 广东广垦畜牧集团股份有限公司广州510612 佛山科学技术学院生命科学与工程学院广东佛山528231

为了探明辽宁省沈阳市某猪场仔猪发生腹泻的病原及其遗传进化特征,试验首先对该猪场发生腹泻的仔猪腹腔进行剖检,记录小肠组织的病理变化;收集病理变化较明显的组织进行切片和H.E.染色,观察并记录结果;取病料后提取病毒核酸,用猪流行性... 详细信息

为了探明辽宁省沈阳市某猪场仔猪发生腹泻的病原及其遗传进化特征,试验首先对该猪场发生腹泻的仔猪腹腔进行剖检,记录小肠组织的病理变化;收集病理变化较明显的组织进行切片和H.E.染色,观察并记录结果;取病料后提取病毒核酸,用猪流行性腹泻病毒(Porcine epidemic diarrhea virus,PEDV)、猪传染性胃肠炎病毒(Porcine transmissible gastroenteritis virus,TGEV)、猪丁型冠状病毒(Porcine delta coronavirus,PDCoV)、猪轮状病毒(Porcine rotavirus,PRoV)和猪急性腹泻综合征冠状病毒(Swine acute diarrhea syndrome coronavirus,SADS-CoV)检测引物进行RT-PCR检测;然后进行病毒的分离、致细胞病变效应(CPE)观察、传代、间接免疫荧光试验与效价的测定;最后对病毒的关键基因进行PCR扩增及遗传进化分析。结果表明:腹泻仔猪小肠肠壁变薄、胀满、充满水样内容物,肠系膜呈树枝状充血,肠系膜淋巴结水肿;十二指肠肠绒毛破碎、细胞坏死,固有层细胞充血;空肠肠绒毛萎缩变短,上皮细胞空泡样变性,少量淋巴细胞浸润,与PEDV感染猪只的肠组织病理变化相同。腹泻仔猪病料组织PEDV核酸检测结果为阳性,其他4种病原检测结果均为阴性。将盲传6代的病毒培养液接种于Vero细胞,培养48 h后出现明显的CPE,以PEDV N特异性单克隆抗体为一抗的间接免疫荧光试验出现特异性的绿色荧光,经测定病毒效价为1×10~(5.83)TCID_(50)/mL。将分离毒株命名为CH/XF1.C.3/2020,其ORF3基因和S基因与国内外PEDV参考株的相似性分别为89.9%~99.6%和92.7%~98.4%。该毒株与近年来分离的国内外的PEDV变异株亲缘关系较近,与经典毒株CV777(GenBank登录号为KT323979.1)的亲缘关系较远,属于GⅡ/GⅡa型PEDV。说明本试验成功分离到一株GⅡ/GⅡa型PEDV,该毒株为该猪场仔猪发生腹泻的病原。

关键词：猪流行性腹泻病毒(PEDV) 流行病学病理变化组织切片遗传进化分析分离鉴定

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小泉沟地震台台基背景噪声特征分析

地震地磁观测与研究 2024年第1期45卷 35-39页

作者：段绍鑫邓明文张剑锋张森新疆维吾尔自治区地震局库尔勒地震监测中心站新疆维吾尔自治区841000

运用Welch算法计算小泉沟地震台功率谱密度PSD,得到垂直向1/3倍频程带宽1—20 Hz各段的平均地动噪声RMS值为2.88×10^(-9)m/s,小于3.16×10^(-8)m/s,符合Ⅰ类台基标准。通过计算概率密度函数PDF,得到小泉沟地震台台背景噪声日变特征为,1... 详细信息

运用Welch算法计算小泉沟地震台功率谱密度PSD,得到垂直向1/3倍频程带宽1—20 Hz各段的平均地动噪声RMS值为2.88×10^(-9)m/s,小于3.16×10^(-8)m/s,符合Ⅰ类台基标准。通过计算概率密度函数PDF,得到小泉沟地震台台背景噪声日变特征为,12—20时明显增大,夜间明显降低,背景噪声受人为活动影响较大;背景噪声年变特征受气温、气压影响较大,呈现夏低冬高的变化趋势。

关键词：小泉沟地震台背景噪声功率谱密度概率密度函数