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Analytical solution for the effective elastic properties of rocks with the tilted penny-shaped cracks in the transversely isotropic background

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Petroleum Science 2024年第1期21卷 221-243页

作者： Zheng-Qian Ma Xing-Yao Yin Zhao-Yun Zong yuan-yuan tan Ya-Ming Yang National Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao266580ShandongChina School of Geosciences China University of Petroleum(East China)Qingdao 266580ShandongChina Pilot National Laboratory for Marine Science and Technology(Qingdao) Qingdao266200ShandongChina

Seismic prediction of cracks is of great significance in many disciplines,for which the rock physics model is ***,up to now,multitudinous analytical models focus primarily on the cracked rock with the isotropic background,while the explicit model for the cracked rock with the anisotropic background is rarely investigated in spite of such case being often encountered in the ***,we first studied dependences of the crack opening displacement tensors on the crack dip angle in the coordinate systems formed by symmetry planes of the crack and the background anisotropy,respectively,by forty groups of numerical *** on the conclusion from the experiments,the analytical solution was derived for the effective elastic properties of the rock with the inclined penny-shaped cracks in the transversely isotropic ***,we comprehensively analyzed,according to the developed model,effects of the crack dip angle,background anisotropy,filling fluid and crack density on the effective elastic properties of the cracked *** analysis results indicate that the dip angle and background anisotropy can significantly either enhance or weaken the anisotropy degrees of the P-and SH-wave velocities,whereas they have relatively small effects on the SV-wave velocity ***,the filling fluid can increase the stiffness coefficients related to the compressional modulus by reducing crack compliance parameters,while its effects on shear coefficients depend on the crack dip *** increasing crack density reduces velocities of the dry rock,and decreasing rates of the velocities are affected by the crack dip *** comparing with exact numerical results and experimental data,it was demonstrated that the proposed model can achieve high-precision estimations of stiffness ***,the assumption of the weakly anisotropic background results in the consistency between the proposed model and Hudson's published theory for the or

关键词： Effective elastic property Tilted crack Transverse isotropy Analytical solution Crack opening displacement

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A comparative study on design standards of screw conveyors in China,Germany,and the USA-Part Ⅱ:Discrete element method

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颗粒学报（英文版） 2024年第9期92卷 113-125页

作者： yuan tan Michael Rackl Weijie Yang Johannes Fottner Wenjun Meng Stephan Kessler Technical University of Munich Chair for Materials HandlingMaterial FlowLogisticsGarchingGermany Ibracon-Ingenieurbüro Dr.-Ing.Rackl ZornedingGermany School of Mechanical Engineering Taiyuan University of Science and TechnologyTaiyuanChina

This part of the study aims to evaluate the advantages and disadvantages of technical standards of screw conveyors in China,Germany,and the USA for industrial *** source or determination method of empirical coefficients as well as the theoretical foundation of dimensioning-relevant diagrams in these standards is not explicitly documented in the ***,instead of less efficient on-site tests,the numerical simulation by discrete element method is *** on the geometrical and operational designs determined in three standards for horizontal,slightly inclined,and vertical conveyance of three representative bulk solids(barley,lignite,and sand),the potential influencing factors are *** constant particle and contact parameters,the potential deviations caused by particle models are ***,the accuracy of power consumption calculation of each standard and the divergence between accessible and required mass flows is comprehensively assessed based on the analysis of simulated *** main conclusions are drawn:(1)Particle fall back is barely considered by all three standards and leads to overestimated mass throughput;(2)The decrease in mass throughput caused by an increasing degree of filling can be compensated by slowing down the rotational speed.

关键词： Bulk solid Design standard Discrete element method Screw auger Screw conveyor

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Tuning the product selectivity of dimethyl oxalate hydrogenation over WOx modified Cu/SiO2 catalysts

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Journal of Energy Chemistry 2024年第10期97卷 128-138页

作者： Zheng Li Zhuo Ma Yihui Li Ziang Zhao yuan tan Ziyin Liu Xingkun Chen Nian Lei Huigang Wang Wei Lu Hejun Zhu Yunjie Ding Hangzhou Institute of Advanced Studies Zhejiang Normal University Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Shaanxi Key Laboratory of Clean Energy Technology Utilization Yulin Branch Dalian National Laboratory For Clean Energy CAS State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences

Product selectivity and reaction pathway are highly dependent on surface structure of heterogeneous *** vapor-phase hydrogenation of dimethyl oxalate（DMO）, "EG route"(DMO→methyl glycolate（MG） ethylene glycol（EG）→ethanol（ET）) and "MA route"(DMO→ MG→methyl acetate（MA）) were proposed over traditional Cu based catalysts and Mo-based or Fe-based catalysts,***,tunable yield of ET（93.7%） and MA（72.1%） were obtained through different reaction routes over WOxmodified Cu/SiO2catalysts,and the corresponding reaction route was further proved by kinetic study and in-situ DRIFTS *** studies demonstrated that H2activation ability,acid density and Cu-WOxinteraction on the catalysts were tuned by regulating the surface W density,which resulted in the different reaction pathway and product ***'s more,high yield of MA produced from DMO hydrogenation was firstly reported with the H2pressure as low as 0.5 MPa.

关键词： Dimethyl oxalate Ethanol Methyl acetate Selective hydrogenation WCu/SiO2 catalyst

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Highly coupled off-resonance lattice design in diffraction-limited light sources

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Nuclear Science and Techniques 2024年第09期 224-234页

作者： Yi-Hao Gong Shun-Qiang Tian Xin-Zhong Liu Shou-Zhi Xuan Li-yuan tan Ling-Long Mao Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai University of Chinese Academy of Sciences

The round-beam operation presents many benefits for scientific experiments regarding synchrotron radiation and the weakening influences of intra-beam scattering in diffraction-limited synchrotron light sources. A round-beam generation method based on the global setting of skew quadrupoles and the application of a non-dominated sorting genetic algorithm was proposed in this study. Two schemes, including large-emittance coupling introduced via betatron coupling and vertical dispersion, were explored in a candidate lattice for an upgrade-proposal of the Shanghai synchrotron radiation facility. Emittance variations with lattice imperfections and their influence on the beam dynamics of beam optic distortions were *** results demonstrated that a precise coupling control ranging from 10 to 100% was achieved under low optical distortion,whereas full-coupling generation and its robustness were achieved by our proposed method by adjusting the skew quadrupole components located in the dispersion-free sections. The Touschek lifetime increased by a factor of 2–2.5.

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Classification of congenital cataracts based on multidimensional phenotypes and its association with visual outcomes

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International Journal of Ophthalmology(English edition) 2024年第3期17卷 473-479页

作者： yuan tan Ying-Shi Zou Ying-Lin Yu Le-Yi Hu Ting Zhang Hui Chen Ling Jin Duo-Ru Lin Yi-Zhi Liu Hao-Tian Lin Zhen-Zhen Liu State Key Laboratory of Ophthalmology Zhongshan Ophthalmic CenterSun Yat-sen UniversityGuangdong Provincial Key Laboratory of Ophthalmology and Visual ScienceGuangdong Provincial Clinical Research Center for Ocular DiseasesGuangzhou 510060Guangdong ProvinceChina

●AIM:To establish a classification for congenital cataracts that can facilitate individualized treatment and help identify individuals with a high likelihood of different visual outcomes.●METHODS:Consecutive patients diagnosed with congenital cataracts and undergoing surgery between January 2005 and November 2021 were *** on visual outcomes and the phenotypic characteristics of ocular biometry and the anterior and posterior segments were extracted from the patients’medical records.A hierarchical cluster analysis was *** main outcome measure was the identification of distinct clusters of eyes with congenital cataracts.●RESULTS:A total of 164 children(299 eyes)were divided into two clusters based on their ocular *** 1(96 eyes)had a shorter axial length(mean±SD,19.44±1.68 mm),a low prevalence of macular abnormalities(1.04%),and no retinal abnormalities or posterior *** 2(203 eyes)had a greater axial length(mean±SD,20.42±2.10 mm)and a higher prevalence of macular abnormalities(8.37%),retinal abnormalities(98.52%),and posterior cataracts(4.93%).Compared with the eyes in Cluster 2(57.14%),those in Cluster 1(71.88%)had a 2.2 times higher chance of good best-corrected visual acuity[<0.7 logMAR;OR(95%CI),2.20(1.25–3.81);P=0.006].●CONCLUSION:This retrospective study categorizes congenital cataracts into two distinct clusters,each associated with a different likelihood of visual *** innovative classification may enable the personalization and prioritization of early interventions for patients who may gain the greatest benefit,thereby making strides toward precision medicine in the field of congenital cataracts.

关键词： classification congenital cataract phenotype visual acuity cluster analysis

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Low cost and low density chloride solid electrolyte for all solid state cathode with high active material ratio

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Nano Research 2024年第10期17卷 8826-8833页

作者： Hao-yuan tan Mei-Yu Zhou Zhongyuan Huang Jin-Da Luo Jing-Tian Yang Jian-Ping Wang Ye-Chao Wu Xiao-Bin Cheng Zi-Wei Wang Xu-Dong Hao Linjun Wang Ke Gong Yi-Chen Yin Yinguo Xiao Hong-Bin Yao Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Department of Applied Chemistry University of Science and Technology of ChinaHefei 230026China School of Advanced Materials Peking University Shenzhen Graduate SchoolShenzhen 518055China

Chloride solid electrolytes(SEs)have attracted widespread attention due to their high room-temperature ionic conductivity and excellent cathode ***,the conventionally selected central metal elements(e.g.,In,Y and Ta)are usually rare and heavy,inevitably causing the high cost and high density of the obtained chloride ***,by choosing abundant and light Mg and Al as central metal elements,we develop a cheap and low density Li_(1.2)Mg_(0.95)Al_(0.3)Cl_(4)SE for high active material ratio in all solid state *** replacement of Mg^(2+)by Al^(3+)in the framework yields vacancies and lowers the non-lithium metal ions occupancy at Mg/Li co-occupied 16d site,effectively relieving the blocking effects by Mg^(2+)in the pristine spinel Li_(2-2x)Mg_(1+x)Cl_(4).Thus,a significantly improved room-temperature conductivity of 3.08×10^(-4)S·cm^(-1)is achieved,two orders of magnitude higher than that of Li_(1.2)Mg_(1.4)Cl_(4).More attractively,its low density of only 1.98 g·cm-3 enables low SE mass ratio in cathodes(only 16 wt.%)with still effective electrolyte/cathode contact and lithium-ion conduction *** charged to potential of 4.30 V,the asfabricated Li_(1.2)Mg_(0.95)Al_(0.3)Cl_(4)-based solid lithium battery with uncoated NCM523 cathode can be cycled for over 100 cycles with a capacity retention of 86.68%at room temperature.

关键词： chloride solid electrolytes low cost low density Li+conductivities

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川东竹琴活态化传承探析

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四川戏剧 2024年第8期 112-115页

作者：张娓谭渊重庆幼儿师范高等专科学校

川东竹琴是渝东地区最具特色的曲种之一,是渝东地区民间说唱艺术的缩影,它将器乐演奏同说唱表演相融合,集川渝地区方言、民间故事、说唱技艺等民间文化为一体,独具韵味,体现了三峡库区地域文化的鲜明特点,是一种重要的舞台艺术表现形式... 详细信息

川东竹琴是渝东地区最具特色的曲种之一,是渝东地区民间说唱艺术的缩影,它将器乐演奏同说唱表演相融合,集川渝地区方言、民间故事、说唱技艺等民间文化为一体,独具韵味,体现了三峡库区地域文化的鲜明特点,是一种重要的舞台艺术表现形式。本文以国家级非物质文化遗产川东竹琴为例,从川东竹琴的历史演变、文化生态出发,探讨川东竹琴的生产性保护与活态传承机制,以期为国内同类非物质文化遗产的保护和传承提供参考。

关键词：非遗保护川东竹琴发展现状活态传承

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PRMT1在消化系统肿瘤中的作用

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中国生物化学与分子生物学报 2024年第4期40卷 526-533页

作者：郭大金谭圆圆金艳花延边大学医学院细胞生物学与医学遗传学教研室吉林延吉133002

蛋白质精氨酸甲基转移酶1(PRMT1)是蛋白质精氨酸甲基转移酶家族中的一员,通过将甲基从S-腺苷-L-甲硫氨酸转移到末端胍基氮原子以甲基化精氨酸残基,催化精氨酸残基的单甲基化和不对称二甲基化。研究发现,PRMT1位于细胞核和细胞质内,参与... 详细信息

蛋白质精氨酸甲基转移酶1(PRMT1)是蛋白质精氨酸甲基转移酶家族中的一员,通过将甲基从S-腺苷-L-甲硫氨酸转移到末端胍基氮原子以甲基化精氨酸残基,催化精氨酸残基的单甲基化和不对称二甲基化。研究发现,PRMT1位于细胞核和细胞质内,参与哺乳动物转录调节、信号转导和DNA损伤修复等过程,并通过多种方式影响肿瘤的增殖、凋亡、转移及耐药等生物学过程,在恶性肿瘤的发生过程中发挥着十分重要的作用。此外,PRMT1还是多种癌症预后不良的生物标志物,其抑制剂能够抑制部分肿瘤的生长。PRMT1与肿瘤的生物学特性密切相关,影响癌症患者的预后。本文主要就PRMT1在消化系统肿瘤中不同的作用靶点以及参与的信号通路做一综述,并简要概括PRMT1抑制剂联合治疗策略,以期为消化系统肿瘤的临床治疗及预后提供新思路。

关键词：蛋白质精氨酸甲基转移酶1 甲基化肿瘤联合治疗

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数字普惠金融的民生福祉效应:“红利”与“鸿沟”

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西北人口 2024年第3期45卷 25-38页

作者：谭远发朱春霞西南财经大学社会发展学院成都611130 西南财经大学经济学院成都611130

数字普惠金融比传统金融具有更好的地理穿透性,为增进民生福祉,破解“胡焕庸线魔咒”提供了可能,但较少有文献对此进行系统研究。论文基于中国民生发展指数和数字普惠金融指数,利用空间统计与计量方法,从市级层面系统考察了数字普惠金... 详细信息

数字普惠金融比传统金融具有更好的地理穿透性,为增进民生福祉,破解“胡焕庸线魔咒”提供了可能,但较少有文献对此进行系统研究。论文基于中国民生发展指数和数字普惠金融指数,利用空间统计与计量方法,从市级层面系统考察了数字普惠金融的民生福祉效应,并分析了以胡焕庸线为界的区域异质性特征。研究发现:数字普惠金融指数和民生福祉指数具有明显的空间分布异质性特点,呈现“高值向东南集聚、低值向西北集聚”的趋势。数字普惠金融与民生福祉皆存在显著的空间关联性,空间集聚特征明显且呈两极分化格局,胡焕庸线仍是两者的重要空间分界线;高-高集聚主要分布在胡焕庸线东南侧的沿海城市,低-低集聚主要分布在靠近胡焕庸线两侧的城市。数字普惠金融显著增进了民生福祉,发挥出“数字红利”的普惠作用;该作用在胡焕庸线东南侧城市显著高于西北侧城市,但两侧差距在缩小,这说明区域“鸿沟”在缩小,“胡焕庸线魔咒”有望破解。此外,研究还显示数字普惠金融的覆盖广度和使用深度是增进民生福祉的主要驱动力,而且后者的作用大于前者。因此,要加快西部地区数字基础设施与相关技术发展,提升胡焕庸线西北侧城市数字普惠金融的覆盖广度与使用深度,以增进区域民生福祉均衡性和可及性。

关键词：数字普惠金融民生福祉胡焕庸线莫兰指数空间滞后模型

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中国孝行故事在18世纪欧洲的传播

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国际汉学 2024年第1期 31-37,150,151页

作者：谭渊宣瑾华中科技大学外国语学院

孝道是中国传统文化的重要组成部分。随着中学西传的兴起,中国的孝道观念在18世纪借助《中国经典六种》等著作逐步传入欧洲,成为“道德伦理之乡”形象中的重要组成部分。尤其是韩国英在1779年发表的《中国古今孝道》中将中国孝道系统地... 详细信息

孝道是中国传统文化的重要组成部分。随着中学西传的兴起,中国的孝道观念在18世纪借助《中国经典六种》等著作逐步传入欧洲,成为“道德伦理之乡”形象中的重要组成部分。尤其是韩国英在1779年发表的《中国古今孝道》中将中国孝道系统地介绍到西方,引起德国教育家、诗人普费弗尔的关注。通过对孝行故事传播与改写的研究可以发现,普费弗尔从中国孝行故事中看到了“孝”的精神感召力,继而在四首叙事诗作品中塑造了作为孝道榜样的中国人群像。这反映了启蒙时代德国思想家对中国文化的关注,也反映了儒家孝道观念对欧洲的影响。

关键词：孝道中学西传儒家中国形象

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