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Full waveform inversion based on hybrid gradient

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Petroleum Science 2024年第3期21卷 1660-1670页

作者： Chuang Xie Zhi-liang qin Jian-Hua Wang Peng Song Heng-Guang Shen Sheng-Qi Yu Ben-Jun Ma Xue-qin Liu qingdao Innovation and Development Base Harbin Engineering UniversityQingdao266000ShandongChina qingdao Innovation and Development Center Harbin Engineering UniversityQingdao266000ShandongChina CNOOC Research Institute Co. Ltd.Beijing100028China College of Marine Geoscience Ocean University of ChinaQingdao266100ShandongChina Weihai Sunfull Geophysical Exploration Equipment Co. Ltd.Weihai264209ShandongChina

The low-wavenumber components in the gradient of full waveform inversion(FWI)play a vital role in the stability of the ***,when FWI is implemented in some high frequencies and current models are not far away from the real velocity model,an excessive number of low-wavenumber components in the gradient will also reduce the convergence rate and inversion *** solve this problem,this paper firstly derives a formula of scattering angle weighted gradient in FWI,then proposes a hybrid *** hybrid gradient combines the conventional gradient of FWI with the scattering angle weighted gradient in each inversion frequency band based on an empirical formula derived *** weighted hybrid mode,we can retain some low-wavenumber components in the initial lowfrequency inversion to ensure the stability of the inversion,and use more high-wavenumber components in the high-frequency inversion to improve the convergence *** results of synthetic data experiment demonstrate that compared to the conventional FWI,the FWI based on the proposed hybrid gradient can effectively reduce the low-wavenumber components in the gradient under the premise of ensuring inversion *** also greatly enhances the convergence rate and inversion accuracy,especially in the deep part of the *** the field marine seismic data experiment also illustrates that the FWI based on hybrid gradient(HGFWI)has good stability and adaptability.

关键词： Full waveform inversion Hybrid gradient Scattering angle weighted Low-wavenumber component

Statistical Models for Condition Monitoring and State of Health Estimation of Lithium-Ion Batteries for Ships

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Journal of Dynamics, Monitoring and Diagnostics 2024年第1期3卷 11-20页

作者： Erik Vanem qin liang Maximilian Bruch Gjermund Bøthun Katrine Bruvik Kristian Thorbjørnsen Azzeddine Bakdi DNV GRD HøvikNorway Department of Mathematics University of OsloOsloNorway Fraunhofer ISE FreiburgGermany Corvus Energy BergenNorway Corvus Energy PorsgrunnNorway

Battery systems are increasingly being used for powering ocean going ships,and the number of fully electric or hybrid ships relying on battery power for propulsion is *** ensure the safety of such ships,it is important to monitor the available energy that can be stored in the batteries,and classification societies typically require the state of health(SOH)to be verified by independent *** paper addresses statistical modeling of SOH for maritime lithium-ion batteries based on operational sensor *** methods for sensor-based,data-driven degradation monitoring will be presented,and advantages and challenges with the different approaches will be *** different approaches include cumulative degradation models and snapshot models,models that need to be trained and models that need no prior training,and pure data-driven models and physics-informed *** of the methods only rely on measured data,such as current,voltage,and temperature,whereas others rely on derived quantities such as state of *** include simple statistical models and more complicated machine learning *** from this exploration will be important in establishing a framework for data-driven diagnostics and prognostics of maritime battery systems within the scope of classification societies.

关键词： battery condition monitoring data-driven analytics diagnostics state of health

4-Nitrocatechol as a novel matrix for low-molecular-weight compounds in situ detection and imaging in biological tissues by MALDI-MSI

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Chinese Chemical Letters 2024年第6期35卷 486-490页

作者： Hualei Xu Manman Han Haiqiang Liu liang qin Lulu Chen Hao Hu Ran Wu Chenyu Yang Hua Guo Jinrong Li Jinxiang Fu Qichen Hao Yijun Zhou Jinchao Feng Xiaodong Wang Key Laboratory of Mass Spectrometry Imaging and Metabolomics(Minzu University of China) State Ethnic Affairs CommissionBeijing 100081China College of Life and Environmental Sciences Centre for Imaging&Systems BiologyMinzu University of ChinaBeijing 100081China

Low-molecular-weight(LMW)compounds are ubiquitous in living organisms and play essential roles in biological *** direct analysis of LMW compounds in biological tissues by matrix-assisted laser desorption/ionization mass spectrometry imaging(MALDI-MSI)could provide a more comprehensive understanding of their essential ***,we evaluated 4-nitrocatechol(4-NC)as a novel positive-ion matrix for enhancing in situ detection and imaging of LMW compounds from the rat liver,brain,and germinating Chinese-yew seed by *** results showed that the 4-NC possessed remarkable features,including strong ultraviolet absorption,uniform matrix crystal,excellent chemical stability,and fewer matrix-related background *** use of 4-NC led to the successful detection of 232,218,and193 LMW compounds from the three abovementioned tissue sections,***,the use of 4-NC improved the imaging quality of LMW compounds in tissue sections through MALDI-MSI and has the potential as a matrix for MALDI tissue imaging of LMW compounds.

关键词： MALDI-MSI 4-Nitrocatechol LMW compounds In situ detection Tissue imaging

Inhibitory Effect of Flavonoid Glycosides from Chlorophytum comosum on Nasopharyngeal Carcinoma 5-8F Cells and Its Mechanism

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Medicinal Plant 2024年第1期15卷 66-70页

作者： Chenliang CHU Xinchen WANG Kuan LU liang qin Lu JIN College of Food and Pharmaceutical Engineering Zhaoqing UniversityZhaoqing 526061China School of Pharmaceutical Sciences Sun Yat-sen UniversityGuangzhou 510006China

[Objectives]To study the inhibitory activity of two flavonoid glycosides isolated from Chlorophytum comosum Laxum *** on human nasopharyngeal carcinoma(NPC)cell line 5-8F in vitro and its mechanism.[Methods]The flavonoid glycosides were isolated and purified from the ethanol alcoholic extract of the roots of Liliaceae plant Chlorophytum comosum by silica gel column chromatography,macroporous resin column chromatography,Sephadex LH-20,and reverse column chromatography(ODS).The inhibitory activity of flavonoid glycosides on human nasopharyngeal carcinoma cells was analyzed by CCK-8 method,and the potential mechanism was preliminarily analyzed by molecular docking.[Results]Two flavonoid glycosides were identified as isovitexin 2″-0-rhamnoside and 7-2″-di-O-β-*** flavonoid glycosides showed promising inhibitory effect on human nasopharyngeal carcinoma cell line 5-8F,with IC_(50) values of 24.8 and 27.5μmol/L,*** docking results showed that the potential targets of two flavonoid glycosides include CyclinD1,Bcl-2β-Catenin,ILK,TGF-β,in addition,two glycosides showed higher predicted binding affinity towards CyclinD1,which verifies the cytotoxicity of the two compounds on human nasopharyngeal carcinoma cell line 5-8F in vitro.[Conclusions]Two flavonoid glycosides are the active molecules in Chlorophytum comosum that can inhibit the proliferation of human nasopharyngeal carcinoma cells,and have the potential to be used in the research and development of anti nasopharyngeal carcinoma drugs.

关键词： Chlorophytum comosum Laxum R.Br. Flavonoid glycosides 5-8F cells Antitumor mechanism

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“土耳其世纪”国家战略愿景探析

现代国际关系 2024年第1期 82-100,137页

作者：梁钦李毓博南京大学国际关系研究院英国杜伦大学政府和国际关系学院

当前,国际格局加速演进,区域大国土耳其在百年诞辰之际提出“土耳其世纪”这一新的国家战略愿景。“土耳其世纪”国家战略既涉及土耳其国内政治、经济、安全、外交,也是土耳其在总结百年治国经验基础上对于第二个百年的战略规划,更是土... 详细信息

当前,国际格局加速演进,区域大国土耳其在百年诞辰之际提出“土耳其世纪”这一新的国家战略愿景。“土耳其世纪”国家战略既涉及土耳其国内政治、经济、安全、外交,也是土耳其在总结百年治国经验基础上对于第二个百年的战略规划,更是土耳其对于未来国际秩序的理解和筹划。土耳其此时出台这一新的国家战略源于埃尔多安及其政党的选举需求,更源自新地缘政治现实的对策预案及由此产生的“土耳其世纪”大国政治想象,同时基于土耳其国家的独立自主理想。“土耳其世纪”愿景能否顺利实现不仅仅取决于土耳其的主观努力,还有赖于区域和国际大环境的助力,严峻的外部形势将会在很大程度上限制其目标的达成。

关键词：新兴经济体土耳其世纪国家战略黑海区域安全埃尔多安

Time-resolved characteristics of a nanosecond pulsed multi-hollow needle plate packed bed dielectric barrier discharge

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Plasma Science and Technology 2024年第7期26卷 48-57页

作者：秦亮李瑶郭浩姜楠宋颖贾锐周雄峰袁皓杨德正 Key Laboratory of Materials Modification by Laser Ionand Electron Beams(Dalian University of Technology)Ministry of EducationDalian 116024People’s Republic of China School of Electrical Engineering Dalian University of TechnologyDalian 116024People’s Republic of China State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System Luoyang 471003People’s Republic of China School of Physics and Materials Engineering Dalian Minzu UniversityDalian 116600People’s Republic of China

In this paper,self-designed multi-hollow needle electrodes are used as a high-voltage electrode in a packed bed dielectric barrier discharge reactor to facilitate fast gas flow through the active discharge area and achieve large-volume stable *** dynamic characteristics of the plasma,the generated active species,and the energy transfer mechanisms in both positive discharge(PD)and negative discharge(ND)are investigated by using fast-exposure intensified charge coupled device(ICCD)images and time-resolved optical emission *** experimental results show that the discharge intensity,number of discharge channels,and discharge volume are obviously enhanced when the multi-needle electrode is replaced by a multihollow needle *** a single voltage pulse period,PD mainly develops in a streamer mode,which results in a stronger discharge current,luminous intensity,and E/N compared with the diffuse mode observed in *** PD,as the gap between dielectric beads changes from 0 to250μm,the discharge between the dielectric bead gap changes from a partial discharge to a standing filamentary micro-discharge,which allows the plasma to leave the local area and is conducive to the propagation of surface *** ND,the discharge only appears as a diffusionlike mode between the gap of dielectric beads,regardless of whether there is a discharge ***,the generation of excited states N_(2)^(+)(B^(2)∑_(u)^(+))and N2(C^(3)Π_(u))is mainly observed in PD,which is attributed to the higher E/N in PD than that in ***,the generation of the OH(A^(2)∑^(+))radical in ND is higher than in *** is not directly dominated by E/N,but mainly by the resonant energy transfer process between metastable N_(2)(A^(3)∑_(u)^(+))and OH(X^(2)Π).Furthermore,both PD and ND demonstrate obvious energy relaxation processes of electron-to-vibration and vibration-to-vibration,and no vibration-to-rotation energy relaxation process is observed.

关键词： packed bed reactor multi-hollow needle electrodes positive and negative discharges optical emission spectra time-resolved images

东西部产业协作何以有效:来自穗黔刺梨产业协作的观察

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中国软科学 2024年第9期 34-43页

作者：谢治菊孙勇梁琴广州大学公共管理学院广东广州510006

东西部产业协作是中国式现代化的重要助力,旨在推动共同富裕和区域协调发展。以穗黔刺梨产业协作为例,运用深度访谈和参与式观察方法,分析东西部产业协作有效的实践逻辑与制度基础。研究表明,西部地区的经济发展面临现代化生产要素的短... 详细信息

东西部产业协作是中国式现代化的重要助力,旨在推动共同富裕和区域协调发展。以穗黔刺梨产业协作为例,运用深度访谈和参与式观察方法,分析东西部产业协作有效的实践逻辑与制度基础。研究表明,西部地区的经济发展面临现代化生产要素的短缺,而东西部产业协作能够在技术、品牌和消费方面补强这些短板,不仅能够通过专业化运营加速要素集聚与资源优化配置,还能够跨越市场行为边界,构建一个由政府、市场与社会多元主体参与的,融合政治、经济、社会等多元利益维度的立体合作框架,实现公平与互惠的共赢格局。然而,要稳固这一协作模式,还需依赖科学的考核机制与合理的利益分配制度,并要求特定市场参与者具备高度的市场驾驭能力。由此,东西部产业协作成功的密码是不仅要选择性引导合作领域与参与主体,还要强调制度设计的精准化与协同性,以保障协作双方高效运转和可持续发展。

关键词：东西部协作产业帮扶市场机制乡村振兴共同富裕

Genotypes and Phenotypes of Uygur Children With Xeroderma Pigmentosum: A Case Study in Xinjiang, China

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International Journal of Dermatology and Venereology 2024年第3期7卷 144-149页

作者： Yun Qiu Wei-Jia Wang Jun-qin liang Buwajieer Yakeya Peng Wang Jing-Zhan Zhang Xiao-Jing Kang Department of Dermatology and Venereology People’s Hospital of Xinjiang Uygur Autonomous RegionUrumqiXinjiang Uygur Autonomous Region 830001China Xinjiang Clinical Research Center for Dermatologic Diseases UrumqiXinjiang Uygur Autonomous Region 830001China Xinjiang Key Laboratory of Dermatology Research(XJYS1707) UrumqiXinjiang Uygur Autonomous Region 830001China

Objective:Xeroderma pigmentosum(XP)is a rare autosomal recessive dermatosis caused by genetic defects of DNA *** study was performed to detect and analyze the genes of 2 Uygur patients with XP and their families and assess the patients’phenotypes,which may enrich the understanding of the genetic skin disorder spectrum in Xinjiang ***:We collected the clinical data from 2 patients with XP and peripheral blood samples from the patients and their family *** patients’DNA was sequenced and detected by Sanger sequencing,and gene mutations were ***:The proband in family 1 presented with brown maculae at the exposure site and squamous cell carcinoma secondary to a facial *** proband had a homozygous nucleotide variation of XPC c.2251-2A>G(A change from A to G in the penultimate position of the intron before the 2251 position in the coding region),which was a shear *** this family,both parents were heterozygous,and no similar mutation detected in the *** family 2,the proband had scattered black brown spots and papules on the trunk and *** his younger sister was also a *** proband and his younger sister had homonucleotide variation of XPA c.631C>T,which was nonsense mutation,resulting in the codon for Arg No.211 being changed into termination codon(***211X),thus terminating the peptide chain synthesis *** the normal individuals in the two families were heterozygotes,and homozygous mutations occurred in all the patients,which was consistent with the autosomal recessive ***:XP is rare in Uygur *** study expanded the mutation spectrum of XP and provided a basis for early diagnosis,treatment,prognostic prediction,and prenatal genetic consultation.

关键词： xeroderma pigmentosum gene mutation XPA gene XPC gene

Efficient activation of the Co/SBA-15catalyst by high-frequency AC-DBD plasma thermal effects for toluene removal

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Plasma Science and Technology 2024年第8期26卷 84-94页

作者：李越姜楠刘政妍秦亮彭邦发王荣刚孙玉荣李杰 School of Environment Dalian University of TechnologyDalian 116024People’s Republic of China School of Electrical Engineering Dalian University of TechnologyDalian 116024People’s Republic of China College of Electrical and Power Engineering Taiyuan University of TechnologyTaiyuan 030024People’s Republic of China Canmax Technologies Co. Ltd.Suzhou 215121People’s Republic of China

Dielectric barrier discharge(DBD)plasma excited by a high-frequency alternating-current(AC)power supply is widely employed for the degradation of volatile organic compounds(VOCs).However,the thermal effect generated during the discharge process leads to energy waste and low energy utilization *** this work,an innovative DBD thermally-conducted catalysis(DBD-TCC)system,integrating high-frequency AC-DBD plasma and its generated thermal effects to activate the Co/SBA-15 catalyst,was employed for toluene ***,Co/SBA-15 catalysts are closely positioned to the ground electrode of the plasma zone and can be heated and activated by the thermal effect when the voltage exceeds 10 k ***12.4 k V,the temperature in the catalyst zone reached 261℃ in the DBD-TCC system,resulting in an increase in toluene degradation efficiency of 17%,CO_(2)selectivity of 21.2%,and energy efficiency of 27%,respectively,compared to the DBD system *** contrast,the DBD thermally-unconducted catalysis(DBD-TUC)system fails to enhance toluene degradation due to insufficient heat absorption and catalytic activation,highlighting the crucial role of AC-DBD generated heat in the activation of the ***,the degradation pathway and mechanism of toluene in the DBD-TCC system were *** work is expected to provide an energy-efficient approach for high-frequency AC-DBD plasma removal of VOCs.

关键词： high-frequency alternating-current power thermal effect dielectric barrier discharge toluene degradation Co/SBA-15 catalysts