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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

金属矿物对丁铵黑药在饱和多孔介质中迁移特性的影响

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东北大学学报（自然科学版） 2024年第3期45卷 401-406页

作者：冯宇庭成丽王可媚胡恩柱东北大学冶金学院辽宁沈阳110819

以丁铵黑药(ADD)为研究对象,基于饱和土柱迁移实验和数学模型,探究石英砂表面金属负载种类和负载量对ADD迁移规律的影响.结果表明,在石英砂表面负载针铁矿(w(Fe)为0.028%和0.042%),不会影响ADD的迁移.在介质上继续负载氧化铜,ADD与矿物... 详细信息

以丁铵黑药(ADD)为研究对象,基于饱和土柱迁移实验和数学模型,探究石英砂表面金属负载种类和负载量对ADD迁移规律的影响.结果表明,在石英砂表面负载针铁矿(w(Fe)为0.028%和0.042%),不会影响ADD的迁移.在介质上继续负载氧化铜,ADD与矿物表面的Cu2+反应生成Cu-ADD络合物,抑制了ADD的迁移.并且随着w(Cu)从0.0018%增加到0.0055%,ADD的回收率从44.32%下降至8.85%.在w(Cu)为0.0018%时,随着ADD质量浓度从20 mg/L增加到60 mg/L,其回收率提高至63.64%.

关键词：丁铵黑药针铁矿氧化铜迁移数学模型

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Biomechanical behavior of grass roots at different gauge lengths

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Journal of Mountain Science 2024年第9期21卷 3201-3214页

作者： FU Jiangtao ZHOU Zhe GUO Hong ZHAO Jimei yu Dongmei WU Jie HU Xiasong School of Civil Engineering and Architecture Shaanxi University of TechnologyHanzhong 723000China Crop Science postdoctoral research station Qinghai UniversityXining 810016China School of Geological Engineering Qinghai UniversityXining 810016China Qinghai institute of Salt Lakes Chinese Academy of SciencesXining 810008China Department of Geographical Science Shaanxi University of TechnologyHanzhong 723000China

Gauge length influences the biomechanical properties of herbaceous roots such as tensile resistance,tensile strength and Young’s ***,the extent to which and how these biomechanical properties of herbaceous roots are influenced remain *** better understand the behavior of roots in tension under different conditions and to illustrate these behaviors,uniaxial tensile tests were conducted on the Poa araratica roots as the gauge length increased from 20 mm to 80 ***,ANOVA was used to test the impact of the significant influences of gauge length on the biomechanical properties,nonlinear regression was applied to establish the variation in the biomechanical properties with gauge length to answer the question of the extent to which the biomechanical properties are influenced,and Weibull models were subsequently introduced to illustrate how the biomechanical properties are influenced by gauge *** results reveal that(1)the variation in biomechanical properties with root diameter depends on both the gauge length and the properties themselves;(2)the gauge length significantly impacts most of the biomechanical properties;(3)the tensile resistance,tensile strength,and tensile strain at cracks decrease as the gauge length increases,with values decreasing by 20%-300%,while Young’s modulus exhibits the opposite trend,with a corresponding increase of 30%;and(4)the Weibull distribution is suitable for describing the probability distribution of these biomechanical properties;the Weibull modulus for both tensile resistance and tensile strain at cracks linearly decrease with gauge length,whereas those for tensile strength and Young’s modulus exhibit the opposite *** tensile resistance,tensile strength,and tensile strain at the cracks linearly decrease with increasing gauge length,while the tensile strength and Young’s modulus linearly increase with increasing gauge length.

关键词： Biomechanical properties of roots Weibull distribution ANOVA Uniaxial tensile test linear regression

旅游驱动下传统民族村寨文化景观演化特征与机理研究——基于贵州西江苗寨的案例

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资源开发与市场 2024年第1期40卷 152-160页

作者：朱正斌李瑞殷红梅于丹贵州师范大学国际教育学院贵州贵阳550001 厦门大学社会与人类学院福建厦门361005 贵州师范大学地理与环境科学学院贵州贵阳550025 贵州师范大学国际旅游文化学院贵州贵阳550025 贵州师范大学历史与政治学院贵州贵阳550025

文化景观是地域文化的重要表征形式,旅游发展不可避免地影响地域文化景观的演化。以大规模旅游活动为主导动因,运用实地调查和参与式制图法,对贵州西江苗寨文化景观演化特征与机理进行分析。结果表明:①西江苗寨物质文化景观整体演化强... 详细信息

文化景观是地域文化的重要表征形式,旅游发展不可避免地影响地域文化景观的演化。以大规模旅游活动为主导动因,运用实地调查和参与式制图法,对贵州西江苗寨文化景观演化特征与机理进行分析。结果表明:①西江苗寨物质文化景观整体演化强度较高,呈现出聚落协调扩张、土地利用破碎化,民居景观服务化,服饰景观展演化特征。②非物质文化景观整体演化程度较低,呈现出饮食文化景观再地方化,制度文化景观外显化,语言文化景观稳固化,歌舞节庆文化景观他娱化特征。③西江苗寨文化景观演化是多元利益主体共同作用的结果。旅游者通过旅游凝视与主客互动引导村寨文化景观的演化,政府和旅游经营者通过权力调配和资本的介入对村寨文化景观的演化进行规训与筛选,村寨居民通过社区参与对村寨文化景观进行叙事与重构。

关键词：旅游驱动民族村寨文化景观演化机制西江苗寨

Rice planting acceleration of the activation and loss of soil iron in the red soil region of southern China

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Soil Ecology Letters 2024年第2期6卷 179-187页

作者： San’an Nie Jie Fan Ningxiang Ouyang Hao Sheng Yangzhu Zhang Xiong Yan Zhan yu College of Resources Hunan Agricultural UniversityChangsha410125China School of Economic Geography Hunan University of Finance and EconomicsChangsha410205China Zunyi Normal University Zunyi563006China

Rice planting decreased total iron but increased active *** activation varied greatly among different paddy soils but not in woodland *** soil iron was mainly affected by pH,SOC and particle *** decrease of soil Fe wa... 详细信息

关键词： paddy soil iron forms parent material rice planting Fe activation

Structure Regulation of Electric Double Layer via Hydrogen Bonding Effect to Realize High-Stability lithium-Metal Batteries

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Energy & Environmental Materials 2024年第3期7卷 76-87页

作者： Sheng liu Chaozhu Shu yu Yan Dayue Du Longfei Ren Ting Zeng Xiaojuan Wen Haoyang Xu Xinxiang Wang Guilei Tian Ying Zeng College of Materials and Chemistry & Chemical Engineering Chengdu University of Technology Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China State Key Laboratory of Polymer Materials Engineering Polymer Research InstituteSichuan University

The interfacial chemistry of solid electrolyte interphases （SEI） on lithium （li）electrode is directly determined by the structural chemistry of the electric double layer （EDL） at the ***,a strategy for regulating the structural chemistry of EDL via the introduction of intermolecular hydrogen bonds has been proposed (p-hydroxybenzoic acid （pHA） is selected as proof'of-concept).According to the molecular dynamics （MD） simulation and density functional theory （DFT） calculation results,the existence of hydrogen bonds realizes the anion structural rearrangement in the EDL,reduces the lowest unoccupied molecular orbital （LUMO） energy level of anions in the EDL,and the number of free solvent molecules,which promotes the formation of inorganic species-enriched SEI and eventually achieves the dendrite-free li *** on this strategy,li‖Cu cells can stably run over 185 cycles with an accumulated active li loss of only 2.27mAhcm-2,and the long-term cycle stability of li‖li cells is increased to 1200 *** addition,the full cell pairing with the commercial liFePO4（LFP） cathodes exhibits stable cycling performance at 1C,with a capacity retention close to90%after 200 cycles.

关键词： electric double layer electrolyte additives intermolecular hydrogen bonds li metal batteries p-Hydroxybenzoic acid

改进型纯氧-纯氢燃烧Graz循环优化与参数影响规律

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中国电机工程学报 2024年第10期44卷 3962-3974,I0018页

作者：余世达胡博李雪松任晓栋李想顾春伟热科学与动力工程教育部重点实验室(清华大学能源与动力工程系) 北京市海淀区100084 北京大学能源研究院北京市海淀区100871

为提升储氢发电的能源利用率,该文在Graz循环的基础上,提出一种改进型Graz循环(R-Graz循环),可实现更为高效的氢-电转换。循环的建模与优化程序基于MATLAB平台开发,工质热力性质由REFPROP得到,计算结果表明:R-Graz循环的设计点净效率可... 详细信息

为提升储氢发电的能源利用率,该文在Graz循环的基础上,提出一种改进型Graz循环(R-Graz循环),可实现更为高效的氢-电转换。循环的建模与优化程序基于MATLAB平台开发,工质热力性质由REFPROP得到,计算结果表明:R-Graz循环的设计点净效率可达70.98%,比同等输入参数的Graz循环高约0.5%,远高于现代燃气-蒸汽联合循环。在相同的氢使用量下,R-Graz循环系统相较Graz循环系统,可多生产0.34%的电能。对关键参数的影响规律分析表明,提升高温燃气透平进口温度、进口压力、高压蒸汽透平进口温度,降低冷凝压力均有助于提升R-Graz循环效率,其中高温燃气透平进口压力、冷凝压力的影响尤为显著。结果为电-氢-电模式的应用提供了新的路径,为部件设计以及参数选择提供了参考。

关键词：纯氧燃烧燃气轮机循环氢能利用热力学分析

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Thermal, Mechanical and Rheological Properties of Eco-friendly Poly(propylene carbonate)/Poly(1,2-propylene succinate) Blends

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Chinese Journal of Polymer Science 2014年第7期32卷 914-922页

作者： dan-dan Wu Wu li Hong-yu liang San-rong liu Jian-yong Fang 张会良 Hui-xuan Zhang li-song Dong Changchun University of Technology Key Laboratory of Polymer Ecomaterials Chinese Academy of SciencesChangchun Institute of Applied Chemistry

In order to improve the flexibility of poly（propylene carbonate）（PPC）, poly（1,2-propylene succinate）（PPSu） was used to plasticize PPC in a batch mixer. The effects of PPSu on the miscibility, thermal stability, mechanical and theological properties of the blends were investigated. PPC was partially miscible with PPSu. It was demonstrated that PPSu decreased the glass transition temperature and melt viscosity of PPC, as shown in the DSC and rheological curves. With the increase in PPSu content, the PPC/PPSu blends showed decreased tensile strength, however, the elongation at break was increased to 1100% for the 70/30 PPC/PPSu blend. The introduction of PPSu provided an efficient and novel plasticization method to extend the application area of PPC.

关键词： Biodegradable Poly(propylene carbonate) Poly(1,2-propylene succinate) Miscibility Blends.

Acrodermatitis Continua of Hallopeau With Excellent Response to Topical Calcipotriol/Betamethasone Ointment:A Report of Two Cases

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International Journal of Dermatology and Venereology 2024年第2期7卷 119-120页

作者： yu-Kun Zhao Hui-Hui Wu Juan-Hua liu Di-Qing Luo Department of Dermatology The East Division of The First Affiliated HospitalSun Yat-sen UniversityGuangzhouGuangdong 510700China

Introduction:Acrodermatitis continua of Hallopeau(ACH)is an uncommon chronic cutaneous *** to date,its treatment is still difficult and frustrating although various topical and systemic agents alone or in different combinations have been tried with variable ***,we report two cases of ACH successfully treated with calcipotriol/betamethasone *** presentation:Two cases of ACH were characterized by thumb involvement alone and showed an excellent response to calcipotriol/betamethasone ointment(1 g:calcipotriol 50µg and betamethasone 0.5 mg).Discussion:Treatment of ACH is challenging for *** systemic therapies and topical drugs have been applied,however,no universally effective treatment regimen has yet been established for long-lasting *** of calcipotriol and betamethasone is more effective in treating psoriasis than the individual components alone,and the current 2 cases with ACH were reported to be treated successfully by the calcipotriol/betamethasone ***:Topical calcipotriol/betamethasone compound is an optional agent for the treatment of ACH with a novel effect.

关键词： pustular eruptions calcipotriol/betamethasone ointment treatment