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弗朗索瓦·邦的数字写作及其启示——以Le Tiers Livre网站为例
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作者 曹丹红 《语言与文化论坛》 2024年第1期71-81,共11页
弗朗索瓦·邦是较早利用网络技术进行数字实践与数字写作的法国当代作家。他在自创的Le Tiers Livre网站进行了形式多样的数字写作:添加对作品的总体评论;通过超链接形式在不同作品之间建立联系;续写;纸质版与网络版作品互为补充;... 弗朗索瓦·邦是较早利用网络技术进行数字实践与数字写作的法国当代作家。他在自创的Le Tiers Livre网站进行了形式多样的数字写作:添加对作品的总体评论;通过超链接形式在不同作品之间建立联系;续写;纸质版与网络版作品互为补充;通过添加对作品整体与局部的详细评论变旧书为新作;等等。通过不断评论、修改、续写、利用自己的旧文本,邦在旧作品的基础上获得了全新的作品,实现了文学创作形式的更新,同时也推动人们在技术时代对文学创作与观念进行更为深入的反思。 展开更多
关键词 弗朗索瓦·邦数字写作 le Tiers Livre
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Forceful Emplacement of Granitic Plutons in an Extensional Tectonic Setting:Syn-kinematic Plutons in the Yagan-Onch Hayrhan Metamorphic Core Complex 被引量:8
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作者 王涛 郑亚东 +2 位作者 李天兵 高永军 马铭波 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2002年第1期81-88,共8页
It is generally considered that granitic plutons are forcefully emplaced in acompressional setting and permissively emplaced in an extensional setting. This paper, however,shows that syn-kinematic (extensional) ellipt... It is generally considered that granitic plutons are forcefully emplaced in acompressional setting and permissively emplaced in an extensional setting. This paper, however,shows that syn-kinematic (extensional) elliptic granitic plutons in the Yagan-Onch Hayrhanmetamorphic core complex (MCC) have relatively strong forceful emplacement, which are indicated by(1) concentric distribution of the rock units, (2) a strain pattern with strong strains on themargins and low strains at the centre of a pluton, and particularly (3) syn-emplacement shorteningof the host rocks within the aureole. The strain analysis for the host rocks shows that thehost-rock ductile shortening, i.e. forceful emplacement, provides about 16-24 percent of theemplacement space for the present plutons. All these suggest that forceful emplacement occurs notonly in a compressional tectonic setting, but also in an extensional setting. This study furtherdemonstrates the significance of the multiple emplacement of granitic plutons and provides newinformation about the causality between granitic magmatism and the formation of the MCC and itsdynamics. 展开更多
关键词 granitic pluton forceful emplacement extension Yagan-Onch Hayrhan
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Granitoid emplacement during syn-convergent transtension:An example from the Huamenlou pluton in North Qinling,central China 被引量:2
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作者 Yang Li Wentian Liang +4 位作者 Guowei Zhang Yazhou Ran Qi Shen Jingli Wang Chunsheng Jin 《Geoscience Frontiers》 SCIE CAS CSCD 2018年第1期191-205,共15页
The Huamenlou pluton,is an elongated granite intrusion with high aspect ratio,emplaced within the southern margin of the North Qinling(central China).Here we investigate this pluton through multiple techniques includi... The Huamenlou pluton,is an elongated granite intrusion with high aspect ratio,emplaced within the southern margin of the North Qinling(central China).Here we investigate this pluton through multiple techniques including the fabric study,microstructural observation and zircon geochronology.Our zircon U-Pb data confirm that the granite crystallized at ca.462 Ma which is consistent with the ages of other linear plutons in North Qinling.Microstructural observations of the Huamenlou granites illustrate that the pluton has undergone superimposed deformation during its emplacement,from magmatic to hightemperature solid state conditions.The internal fabric obtained by anisotropy of magnetic susceptibility(AMS)and shape preferred orientation(SPO)show similar results.The fabrics are relatively concordant and generally vary from NE-SW to NEE-SWW which are roughly oblique to the trend of the pluton elongation and the regional structures.Meanwhile,scalar parameters reflect two completely different strain regimes for the pluton and its host rocks,i.e.,the fabrics within host rocks are mainly oblate while the central part of the intrusion displays mainly prolate fabrics.It is inferred that the structural pattern recorded in this pluton was caused by local dextral transtension in consequence of oblique convergence between the South and North China Blocks.We propose that the local transtension in convergence setting probably evolved from vertical extrusion tectonics that provided room for the magma emplacement and imparted prolate fabrics in the Huamenlou pluton. 展开更多
关键词 Zircon U-Pb dating Magnetic fabric Shape preferred orientation Linear pluton QINLING OROGEN
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不同RANS/LES混合方法在汽车标模外流场非定常数值模拟中的对比
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作者 杨志刚 陶悦 +1 位作者 夏超 史芳琳 《同济大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第S01期76-87,共12页
针对MIRA汽车标模外流场,采用RANS/LES混合方法开展非定常数值模拟,通过与风洞实验测力、测压结果进行详细对比分析,探究不同RANS/LES混合方法(DDES、IDDES、SBES、SDES)以及基于不同RANS模型(RKE、SA、SST k-ω、GEKO k-ω)的DDES方法... 针对MIRA汽车标模外流场,采用RANS/LES混合方法开展非定常数值模拟,通过与风洞实验测力、测压结果进行详细对比分析,探究不同RANS/LES混合方法(DDES、IDDES、SBES、SDES)以及基于不同RANS模型(RKE、SA、SST k-ω、GEKO k-ω)的DDES方法在汽车外流场计算中的适用性。研究表明:对于气动力系数,不同混合方法的预测结果都偏高,其中DDES-GEKO模型的相对误差最小;对于表面压力系数,不同混合方法对垂直中截线的压力预测结果与实验值吻合程度较高,其中SBES-GEKO模型的结果更优;DDES模型内嵌不同RANS模型对后风窗的压力预测差别明显,其中SA模型较优;而不同混合方法对车底的压力预测偏差较大,对车底前部压力预测都小于实验值,其中对车底后部,SBES-GEKO模型的结果较优;此外,SBESGEKO模型能较好的识别出尾迹区的非定常流动结构。 展开更多
关键词 MIRA汽车标模 非定常数值模拟 RANS/leS混合方法
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基于RANS/LES混合方法的三维L型弯管流场特性数值模拟
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作者 陈喆 仝哲 +1 位作者 韩盼盼 尤云祥 《船舶工程》 CSCD 北大核心 2024年第6期138-143,152,共7页
L型弯管是船用典型部件,可实现流体质量输运和热量交换等功能。由于弯曲段曲率的影响,其内部流动十分复杂。传统的雷诺平均方法(RANS)无法模拟弯曲段的复杂流动,而大涡模拟方法(LES)则计算量太大。为此,采用RANS/LES混合方法对经典L型... L型弯管是船用典型部件,可实现流体质量输运和热量交换等功能。由于弯曲段曲率的影响,其内部流动十分复杂。传统的雷诺平均方法(RANS)无法模拟弯曲段的复杂流动,而大涡模拟方法(LES)则计算量太大。为此,采用RANS/LES混合方法对经典L型弯管进行数值模拟研究,该方法在近壁面区域采用RANS方法,在湍流核心区采用LES方法,不仅可保持模拟精度,而且网格需求量较低更适用于工程应用。针对商软中的2类RANS/LES方法——脱体涡方法(IDDES)及应力混合涡模拟(SBES)方法,比较分析其在L型弯管内部流场仿真方面的优劣,并同时考虑流向曲率修正的影响。结果表明:SBES方法对弯管内二次流(迪恩涡)的预测能力优于IDDES方法,且曲率修正模型可进一步改善SBES方法的仿真结果。 展开更多
关键词 雷诺平均/大涡模拟混合方法 L型弯管 流向曲率修正 脱体涡方法 应力混合涡模拟
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Petrogenesis of the Shadegai Pluton in Inner Mongolia:Evidence from Petrography,Element Geochemistry and Geochronology 被引量:1
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作者 GENG Huiqing ZHANG Yongmei 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2017年第2期757-758,共2页
Objective The widely exposed granites in the Wulashan area of Inner Mongolia are an important component of intermediate-acidic magma belt at the northern margin of the North China Craton, and are also a natural labor... Objective The widely exposed granites in the Wulashan area of Inner Mongolia are an important component of intermediate-acidic magma belt at the northern margin of the North China Craton, and are also a natural laboratory to research the origin of granite bodies. The Shadegai pluton, a representative intrusion, intruded into the Wulashan Group metamorphic rocks, occurring as stock, and was controlled by the Linhe-Jining deep fracture. This pluton is composed of dominant K-feldspar granites and less biotite moyite, with abundant mafic microgranular enclaves (MMEs) dominated by gray black monzonite. Most MMEs have a sharp contact zone with their host granite, and few have a gradual contact relationship. Previous researches have described the characteristics of petrology and chronology of the Shadegai pluton, but few have focused on the characteristics of the petrography, 展开更多
关键词 Petrogenesis of the Shadegai pluton in Inner Mongolia:Evidence from Petrography Element Geochemistry and Geochronology
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亚临界区圆柱绕流相干结构壁面模化混合RANS/LES模型 被引量:1
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作者 季梦 尤云祥 +3 位作者 韩盼盼 邱小平 马乔 吴凯健 《物理学报》 SCIE EI CAS CSCD 北大核心 2024年第5期190-216,共27页
本文发展了一种具有壁面模化大涡模拟能力的雷诺平均纳维-斯托克斯(RANS)和大涡模拟(LES)方法的混合模型(简称WM-HRL模型),致力于对亚临界区雷诺数钝体绕流相干结构这类复杂流动现象进行高置信度的CFD解析模拟研究.该方法通过一个仅与... 本文发展了一种具有壁面模化大涡模拟能力的雷诺平均纳维-斯托克斯(RANS)和大涡模拟(LES)方法的混合模型(简称WM-HRL模型),致力于对亚临界区雷诺数钝体绕流相干结构这类复杂流动现象进行高置信度的CFD解析模拟研究.该方法通过一个仅与当地网格空间分布尺寸有关的湍动能解析度指标参数rk即可实现从RANS到LES的无缝快速转换,并且RANS/LES混合转换区的边界位置及其各个分区(包括RANS区、LES区及RANS/LES混合转换区)对湍动能的解析能力均可通过两个指标参数nrk1-Q和nrk2-Q准则进行预先设定.通过对雷诺数Re=3900下圆柱绕流场的系列数值模拟研究,获得了能够高置信度解析并捕捉其绕流场中三维时空瞬态发展相干结构特性的湍动能解析度指标参数nrk1-Q和nrk2-Q准则的组合条件.研究表明,该WM-HRL模型不仅能够准确获取圆柱绕流场中剪切层小尺度K-H不稳定性结构的精细谱结构,而且在同一套网格系统下通过变化湍动能解析度指标参数nrk2-Q和nrk1-Q准则的组合条件,还可以精细解析圆柱绕流场中两类不同回流区的长度结构特征,及其对应的圆柱尾部近壁面处V和U形两个平均流向速度剖面的分支结构特性. 展开更多
关键词 圆柱绕流 相干结构 KELVIN-HELMHOLTZ不稳定性 混合RANS/leS模型
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The significance of U-Pb zircon ages in zoned plutons:the case of the Flamenco pluton, Coastal Range batholith, northern Chile
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作者 Natalia Rodríguez Juan Díaz-Alvarado +3 位作者 Carlos Fernández Paulina Fuentes Christoph Breitkreuz Colombo Celso Gaeta Tassinari 《Geoscience Frontiers》 SCIE CAS CSCD 2019年第3期1073-1099,共27页
Compositionally zoned plutons, both layered and concentrically arranged, provide granitic exposures where the mechanisms and timing of the magmatic emplacement processes can be studied. The importance of in-situ geoch... Compositionally zoned plutons, both layered and concentrically arranged, provide granitic exposures where the mechanisms and timing of the magmatic emplacement processes can be studied. The importance of in-situ geochemical differentiation and the magma replenishment rates are revealed by geochemistry and field relations, together with the increasingly accurate U-Pb geochronology, which has promoted the knowledge about the pluton incremental assembly theories.The Flamenco pluton, located in the Coastal Range of northern Chile, is part of the Upper Triassic to Early Cretaceous Andean intrusives formed in the western active margin of South America, and present a normal zoned structure with mafic magmatic facies(mostly gabbros and Qtz-diorites) close to the contacts with the host metasediments, and tonalites, granodiorites and granites in the inner areas. A combined study of the field relations, geochemistry and zircon geochronology of the magmatic facies was applied to determine the emplacement sequence of the Flamenco pluton, revealing three distinguishable domains separated by metasedimentary septa. The SW area is constituted by mostly homogeneous leucocratic granodiorites that yielded an age of 213 Ma as the best estimation for their emplacement age. Distinctive geochemical characteristics, such as the absence of an Eu anomaly, the depletion in HREE, or the highest Sr, Sr/Y and Ce/Yb values among the granodioritic facies of the pluton,involve lower T and/or higher P conditions at the magmatic source according to experimental studies.These conditions were established during an early stage of the Andean magmatic arc building that is firstly defined here as Upper Triassic. The NW and E domains of the pluton were sequentially emplaced between 194 Ma and 186 Ma and both the field relations and the detailed geochronological results suggest that the mafic facies intruded latter in the emplacement sequence. To the NW, Qtz-dioritic and gabbroic externally emplaced pulses gave a younger crystallization age of 186.3 ± 1.8 Ma, and promoted the granoblastic textures and metamorphic zircon overgrowths that characterize the granodiorites located in the contact with the intermediate and felsic inner magmas, which yielded a best estimation of their emplacement age of 192 士 1.5 Ma. On the other hand, in the eastern domain, magma-magma relations are observed between gabbros and previously intruded tonalites and granodiorites. Both the mafic and intermediate facies show two main subgroups of ages that yielded 194.7 土 1.5 Ma to188.3 ± 2.1 Ma and 193.1 ± 2.2 Ma to 185.5 ± 1.4 Ma respectively. These differences are related to the variations in the magmatic addition rates, which may extend the super-solidus conditions in the eastern domain of the magmatic reservoir as is confirmed by the wider age ranges yielded by these magmatic facies. Zircon overgrowths in the host rocks yield similar ages(around 220 Ma and 205 Ma) than the oldest results obtained in the intrusive facies, indicating that metamorphism correlates with the initial stages of plutonic emplacement.Geochronological results differ between 9 Myr and 41 Myr in the eight studied samples for noninherited ages and gave very close mean ages(within analytical uncertainty) for all the intrusive units. However, we examine other characteristics such as zircon morphology, internal structure,geochemistry and statistical data to assess if the scattering of the geochronological data may be related to the different processes involved in the construction of the Flamenco pluton. We concluded that this detailed study of U-Pb zircon ages, including individual and significative groups of analyses, is useful to determine accurately the emplacement sequence and the genetic relation between the intrusive units,together with the evidences depicted by the geochemistry and field relations. 展开更多
关键词 ZIRCON U-Pb geochronology Zoned plutonS Andean MAGMATIC arc Sequential EMPLACEMENT Individual and statistical ZIRCON ages
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上颌骨改良Le FortⅠ型截骨术的三维建模和术后咬合有限元分析
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作者 刘楚晴 李阳 +1 位作者 毕绍洋 林阳阳 《中国医科大学学报》 北大核心 2024年第1期46-50,共5页
目的根据CT扫描数据,基于4种软件建立光顺的上颌骨三维几何模型,模拟改良Le FortⅠ型截骨术及固定方案,对患者术后咬合情况进行有限元分析。方法使用Mimics软件初步处理CT图像,建立STL模型。将模型导入Inspire Studio软件中,建立光滑的P... 目的根据CT扫描数据,基于4种软件建立光顺的上颌骨三维几何模型,模拟改良Le FortⅠ型截骨术及固定方案,对患者术后咬合情况进行有限元分析。方法使用Mimics软件初步处理CT图像,建立STL模型。将模型导入Inspire Studio软件中,建立光滑的PolyNURBS几何模型。使用SpaceClaim软件,模拟手术截骨及钛板、钛钉固定方案。使用ANSYS Workbench软件,对术后患者咬合情况进行三维有限元分析。结果仿真结果显示,在磨牙咬合状态下有限元模型的连接关系建立准确无误。在共计6 N的咬合力作用下,钛板最大等效应力为73 MPa。结论本研究采用的上颌骨建模和分析方法可获得适用于仿真分析的光滑几何模型,有限元分析结果可以为各类正颌手术的固定方案提供参考。 展开更多
关键词 上颌骨建模 有限元分析 改良le FortⅠ型截骨术 应力分布
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Characteristic Features and U-Pb Isotopic Ages of Zircons in a Middle Proterozoic Granite Pluton from Baoban Area, Hainan Province, China
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作者 俞受鋆 夏萍 +2 位作者 邓铁殷 李强 陈毓蔚 《Chinese Journal Of Geochemistry》 EI CAS 1993年第2期161-170,共10页
The crystal form,chemical composition and U-Pb isotopic composition of various zircon fractions is a Middle Proterozoic granite pluton from the Baoban area suggest that the zircons are typically magmatogenic in nature... The crystal form,chemical composition and U-Pb isotopic composition of various zircon fractions is a Middle Proterozoic granite pluton from the Baoban area suggest that the zircons are typically magmatogenic in nature,and different from those of sedimentary and epigenetic orgins.The various zircon fractions yielded and age of about 1440.87Ma,which may represent the ge of zircon crystallization.The so-called aoban-group migmatite is,as a matter of fact,a Middle Proterozoic granite pluton. 展开更多
关键词 锆石 花岗岩 深成岩体 海南 铀-铅同位素年龄 中原生代
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Mechanisms and Processes Leading to Reverse Zoning in the Andong Granitoid Pluton, Andong Batholith, Korea
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作者 Sang Koo HWANG 《Global Geology》 2002年第2期114-127,共14页
The Andong pluton consists of comagmatic granitoid rocks which constitute outstanding examples of reversely zoned granitoids. The pluton has three lithofacies: hornblende biotite tonalite, biotite granodiorite and por... The Andong pluton consists of comagmatic granitoid rocks which constitute outstanding examples of reversely zoned granitoids. The pluton has three lithofacies: hornblende biotite tonalite, biotite granodiorite and porphyritic biotite granite. The zoned pattern forms by locating a tonalite core containing high-temperature mafic assemblages in central part,granodiorite rims in marginal part, and a porphyritic granite cap containing more felsic assemblages in topside of the pluton.Mineral abundances as well as bulk compositions of the granitoids indicate that the interior is enriched in mafic minerals and that it shows higher contents of oxides than the margin and topside. The compositional gradients change gradually with continuity between the lithofacies. The regular compositional variations within the pluton support the argument that the pluton behaved as an individual petrochemical system. Model abundances of the granitoids are in agreement with the bulk compositional gradients, suggesting that no significant interaction with country rocks occurred. Remobilization (resurgence) of deeper parts of the system into the more felsic magmas of the chamber explains the reverse zoning. Fractional crystallization was of importance and probably accounts for the selective removal of the settling phases. The Andong pluton is an example of reversely zoned plutons related by remobilization of more mafic but consanguineous magmas. Large-scale upwelling occurred in the pluton leading to the present arrangement of three lithofacies. It is conceivable that remnants of the reverse zoning become more difficult to discern as the plutonic rocks reach the latest stages of their evolution. In this case, the Andong pluton represents an earlier stage in the evolution of a felsic system that is usually represented by the final stages in normally zoned plutons. 展开更多
关键词 Andong GRANITOID pluton Reverse zoning Mechanisms and processes leADING
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基于LES湍流模型的角形喷嘴数值模拟
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作者 邓富春 王尊策 +2 位作者 刘海水 李森 岳宇航 《煤矿机械》 2024年第7期203-206,共4页
针对RANS方法存在空化流场预测不准确的问题,通过采用大涡模拟(LES)对角形喷嘴进行数值模拟来获得其瞬时速度场以及空化云分布。通过对其流场进一步分析,揭示了空化水射流在发展过程中漩涡结构与空化之间的关系以及不同压力下的射流分... 针对RANS方法存在空化流场预测不准确的问题,通过采用大涡模拟(LES)对角形喷嘴进行数值模拟来获得其瞬时速度场以及空化云分布。通过对其流场进一步分析,揭示了空化水射流在发展过程中漩涡结构与空化之间的关系以及不同压力下的射流分布特征,为工程实践应用及空化射流机理提供了理论参考。 展开更多
关键词 空化水射流 漩涡 leS 流场分析
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The Early Paleozoic Tectonic Evolution of the West Kunlun Mountains: New Constraint from the North Küda Pluton
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作者 袁超 周辉 +2 位作者 孙敏 李继亮 侯泉林 《Chinese Journal Of Geochemistry》 EI CAS 2001年第1期12-19,共8页
Systematic geochemical studies have been conducted on the North Küda Pluton, West Kunlun, in order to reveal its petrogenesis and tectonic implications. The North Küda Pluton is a potassium\|rich (K\-2O>5... Systematic geochemical studies have been conducted on the North Küda Pluton, West Kunlun, in order to reveal its petrogenesis and tectonic implications. The North Küda Pluton is a potassium\|rich (K\-2O>5.4wt%) I\|type granitic pluton and does not contain any alkaline ferromagnesian mineral. Its relatively high REE, LILE (e.g. Rb, Cs, U and Th) and HFSE (e.g. Nb, Zr) contents make it very akin to the A\|type granites. Its heterogeneous Sr (\{\{\}\+\{87\}Sr\}/\{\{\}\+\{86\}Sr\-i\}=\{0.7049\}~\{0.7098\}) and Nd (εNd\-T=\{-1.05\}~\{-4.04\}) isotope compositions preclude the possibility of a pure sedimentary or igneous source. Instead, its geochemical compositions suggest that it may be derived from partial melting of a complex source, which consists of igneous and sedimentary rocks. Its intraplate characteristics, together with coeval mafic dykes, indicate an extensional environment at the end of Caledonian. The recognition of the extensional event does not support a continuous subduction\|accretion model for the Paleozoic tectonic evolution of the West Kunlun Mountains. On the contrary, it provides new evidence for the two\|stage island\|arc model. 展开更多
关键词 地球化学特征 岩石发生学 地壳构造 古生代 火成岩 昆仑山
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基于WRF-LES模式的大气边界层近地风场精细化模拟研究
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作者 刘达琳 陶韬 +2 位作者 曹勇 周岱 韩兆龙 《上海交通大学学报》 EI CAS CSCD 北大核心 2024年第2期220-231,共12页
台风等极端气象灾害对工程结构安全造成严重威胁,研究近地面大气边界层精细化模拟对于土木工程具有重要应用价值.数值天气预报系统(WRF)中的大涡模拟(LES)模块具有参数方案多、精度高等优点,适用于近地面风场精细化模拟,但数值天气预报... 台风等极端气象灾害对工程结构安全造成严重威胁,研究近地面大气边界层精细化模拟对于土木工程具有重要应用价值.数值天气预报系统(WRF)中的大涡模拟(LES)模块具有参数方案多、精度高等优点,适用于近地面风场精细化模拟,但数值天气预报-大涡模拟(WRF-LES)精细化模拟效果与参数设置密切相关.寻求适用于精细化模拟近地面风场的参数设置,选用WRF-LES模式中的几种次网格模型和空间差分格式,采用较细密的网格分辨率,进行理想大气边界层模拟.对比平均风速剖面、湍流强度剖面和功率谱等风场特性,讨论关键参数对近地面风场模拟精度的影响,确定合适的参数设置.研究表明:对次网格模型,非线性回波散射和各向异性(NBA1)模型可有效改善近地面风场模拟精度;对网格方案,在计算域底部不均匀加密垂直网格可更好地描述近地面风场空间分布特征,有效减小计算资源;对空间差分格式,偶数阶差分相较奇数阶差分格式可捕获更小尺度湍流结构.所提出的WRF-LES模式参数方案,可为精细化模拟近地面风场和台风边界层提供技术参考. 展开更多
关键词 次网格模型 网格分辨率 空间差分格式 数值天气预报-大涡模拟
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Internet Gaming Disorder and Mental Health of Children in China:A Latent Profile Analysis
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作者 Md Zahir Ahmed Oli Ahmed +2 位作者 Lingfeng Gao Mary C.Jobe Weijian Li 《International Journal of Mental Health Promotion》 2024年第7期517-529,共13页
In recent years,speculation of an increase in Internet Gaming Disorder(IGD)has surfaced with the growing popularity of internet gaming among Chinese children and adolescents.The detrimental impact of IGD on mental hea... In recent years,speculation of an increase in Internet Gaming Disorder(IGD)has surfaced with the growing popularity of internet gaming among Chinese children and adolescents.The detrimental impact of IGD on mental health cannot be denied,even though only a small portion of the screen-dependent population exhibits psychopathological and behavioral symptoms.The present study aimed to explore a latent profile analysis(LPA)of Internet Gaming Disorder on the mental health of Chinese school students.The data were collected from a sample of 1005 Chinese school students(49.8%male;age M=13.32,SD=1.34 years)using a paper-pencil survey through convenience sampling.LPA explored three latent profiles of internet gamers:regular gamers(62.4%),moderate gamers(28.1%),and probable disordered gamers(9.4%).Results showed that the probable disordered gamers had significantly higher levels of depression,anxiety,emotional and conduct problems,hyperactivity,and peer problem symptoms as well as lower life satisfaction,and pro-social symptoms compared to regular and moderate gamers(p<0.05).This study would be helpful to mental health professionals in designing interventions for gamers who present IGD symptoms.Future longitudinal studies should also be undertaken to assess whether mental health worsens for probable disordered gamers. 展开更多
关键词 Internet gaming disorder latent profile analysis mental health children and adolescents China
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基于Le Bissonnais法揭示桉树人工林土壤团聚体的崩解机制
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作者 梁建新 周娟 +3 位作者 朱星华 吴玉辉 施瑜 唐莉莉 《林业科技》 2024年第6期28-33,共6页
以广西国有大桂山林场为研究区域,选择连栽第1代(Ⅰ)、第2代(Ⅱ)、第3代(Ⅲ)桉树人工林为研究对象。采集0~20 cm和20~40 cm土层原状土样,通过传统湿筛法和Le Bissonnais(LB)法探究土壤团聚体稳定性的变化规律,其中LB法包括快速湿润(FW)... 以广西国有大桂山林场为研究区域,选择连栽第1代(Ⅰ)、第2代(Ⅱ)、第3代(Ⅲ)桉树人工林为研究对象。采集0~20 cm和20~40 cm土层原状土样,通过传统湿筛法和Le Bissonnais(LB)法探究土壤团聚体稳定性的变化规律,其中LB法包括快速湿润(FW)、慢速湿润(SW)和预湿扰动(WS)处理。结果表明,桉树人工林土壤主要以>2mm团聚体为主。在不同湿润处理下,土壤团聚体稳定性指标MWD和GMD值均表现为Ⅲ>Ⅱ>Ⅰ,说明连栽第3代的桉树人工林土壤团聚体稳定性最高。在桉树人工林中,MWD和GMD值随着土层深度的增加而减少,表明表层土壤团聚体稳定性较高于底层。在LB法的3种湿润处理中,桉树人工林土壤团聚体MWD和GMD值均表现为WS>SW>FW,表明FW处理对本研究区域的土壤团聚体破坏最大。该处理是模拟大雨突然来临时的情形,其破坏机制是团聚体内闭蓄空气被快速压缩而产生的气爆作用。因此,适当增加林下植被覆盖度则有利于桉树人工林土壤结构的改善。 展开更多
关键词 桉树人工林 团聚体稳定性 le Bissonnais法
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基于LES模型的箱涵式进水流道水中消涡装置分析
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作者 裴杰 李四海 +2 位作者 王振华 徐贵颖 杨帆 《水科学与工程技术》 2024年第4期41-45,共5页
为解决某泵站箱涵式进水流道内部水涡问题,以该泵站箱涵式进水流道为研究对象,基于LES模型,求解5种不同消涡方案对应的箱涵式进水流道内部水涡时空演变过程,定量对比喇叭口处旋涡中心平均涡量变化。结果表明:采用流线型消涡锥和后消涡... 为解决某泵站箱涵式进水流道内部水涡问题,以该泵站箱涵式进水流道为研究对象,基于LES模型,求解5种不同消涡方案对应的箱涵式进水流道内部水涡时空演变过程,定量对比喇叭口处旋涡中心平均涡量变化。结果表明:采用流线型消涡锥和后消涡板方案箱涵式进水流道消涡的效果最佳,相比原方案旋涡涡心的平均涡量降低96.53%,喇叭管进口面的轴向速度分布均匀度为95.7%,速度加权平均角为86.4°,消涡效果较好。 展开更多
关键词 泵站 箱涵式进水流道 水中涡 消涡锥 消涡板 涡态 leS 数值模拟
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Portevin-Le Chatelier Effect in Additively Manufactured and As-Cast Inconel 939 Nickel-Based Superalloy
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作者 Moshe Nahmany Daniel Moreno +4 位作者 Yohanan Nahmana Mathan Zakai Ariel Yehuda Cohen Moshe Shapira Roni Shneck 《Journal of Minerals and Materials Characterization and Engineering》 2024年第6期299-315,共17页
Nickel-based superalloys, well-established in aeronautics, have recently gained significant traction in additive manufacturing. Inconel 939 is one of the alloys increasingly playing a vital role in this field. This pa... Nickel-based superalloys, well-established in aeronautics, have recently gained significant traction in additive manufacturing. Inconel 939 is one of the alloys increasingly playing a vital role in this field. This paper examines the development of the Portevin-Le Chatelier (PLC) effect in additively manufactured Inconel 939 in comparison with cast Inconel 939. A detailed analysis of tensile test characteristics was conducted, complemented by a high-resolution scanning electron microscopy (HR-SEM) investigation. The PLC region exhibited several properties during tensile testing, such as stress-strain behavior, cycle scale, and overall stress increase. The HR-SEM analysis of Gamma prime (γ') precipitates revealed distinct morphologies, which are suggested to be linked to the features of the PLC region. Samples with a high amount of γ' precipitates showed a less pronounced PLC region, while those with fewer γ' precipitates displayed a more distinct PLC effect. A mechanism for the cyclic drop-and-rise stress behavior, based on the work of Varvenne and La-Rose, was proposed, possibly induced by the varying morphologies of γ' precipitates in the IN939 alloy. Further study is needed to deepen the understanding of the relationship between the γ' micro-(nano) structure and the PLC phenomenon. 展开更多
关键词 Inconel 939 Gamma Prime γ' Portevin-le Chatelier (PLC) Dynamic Strain Aging DSA Mechanical Properties Additive Manufacturing SUPERALLOYS
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血清学和分子生物学鉴定Lewis血型抗体引起的输血反应 被引量:27
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作者 洪小珍 许先国 +2 位作者 朱发明 马开荣 严力行 《中国实验血液学杂志》 CAS CSCD 2008年第5期1192-1195,共4页
为了分析1例溶血性输血反应产生的原因,用谱细胞和Le(a-b-)表型细胞鉴定患者血清中的抗体,用抗Lea和抗Leb血型试剂鉴定患者红细胞表型,用PCR测序方法分析LE基因(FUT3基因)全编码区序列。结果表明:患者血清中有抗Lea和抗Leb抗体,血型表型... 为了分析1例溶血性输血反应产生的原因,用谱细胞和Le(a-b-)表型细胞鉴定患者血清中的抗体,用抗Lea和抗Leb血型试剂鉴定患者红细胞表型,用PCR测序方法分析LE基因(FUT3基因)全编码区序列。结果表明:患者血清中有抗Lea和抗Leb抗体,血型表型为Le(a-b-),LE基因型为无效等位基因纯合子(le59,508)。结论:抗Leb抗体可引起溶血性输血反应,患者FUT3基因突变导致Le(a-b-)表型。 展开更多
关键词 le(a—b-)表型 FUT3基因 溶血性输血反应 le^a和抗le^b抗体
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基于Le Bissonnais法的石漠化区桑树地埂土壤团聚体稳定性研究 被引量:19
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作者 汪三树 黄先智 +4 位作者 史东梅 郭彦军 郭宏忠 彭旭东 李叶鑫 《生态学报》 CAS CSCD 北大核心 2013年第18期5589-5598,共10页
石漠化区独特的水土流失作用使该区土壤严重退化,地埂植物作为一种独特的农林复合模式对石漠化区土地质量改善和坡耕地土壤生态修复作用明显,能有效保证坡耕地的生态条件和生产性能。选取石漠化区3种不同管理方式的桑树地埂为研究对象,... 石漠化区独特的水土流失作用使该区土壤严重退化,地埂植物作为一种独特的农林复合模式对石漠化区土地质量改善和坡耕地土壤生态修复作用明显,能有效保证坡耕地的生态条件和生产性能。选取石漠化区3种不同管理方式的桑树地埂为研究对象,采用传统湿筛(Cаввинов法)和Le Bissonnais法测定土壤团聚体分布与稳定性特征。结果表明:基于Cаввинов法测定的土壤团聚体稳定性以天然林最好,桑埂自然生草地和清草地相对居中,桑埂农地最差;3种管理方式的桑树地埂土壤团聚体稳定性指数(ASI)随地埂距离均表现为ASI90cm>ASI60cm>ASI30cm,主要原因在于桑树地埂对坡耕地土壤团聚体影响的作用范围主要集中在距株30 cm以内,而在地埂30 cm以外田面农耕活动对土壤团聚体结构影响较大,而受桑树地埂影响作用较小。基于Le Bissonnais法快速湿润(FW)处理后土壤团聚体集中分布在0.5—0.25 mm之间,慢速湿润(SW)和湿润振荡(WS)处理后团聚体主要分布在5—1 mm之间。Le Bissonnais法处理后土壤团聚体稳定性表现趋势与Cаввинов法一致,3种处理后的团聚体分形维数D、MWD和GMD均表现为FW<SW<WS。Le Bissonnais法FW和SW处理后团聚体稳定性指标与Cаввинов法达到极显著相关,说明Le Bissonnais法测定石漠化区土壤团聚体稳定性是可行的;石漠化区土壤团聚体稳定性与有机质和粘粒含量呈显著正相关(0.586≤R≤0.864),这说明石漠化区土壤团聚体稳定性是以上两种土壤胶结物质的黏聚作用形成的,且两种土壤胶结物质对土壤消散作用和粘粒膨胀作用引起的团聚体破坏抵抗性强烈,而对低强度机械干扰引起的团聚体破碎没有明显抵抗性,研究结果对石漠化区坡耕地土壤保持具有重要指导意义。 展开更多
关键词 土壤团聚体 稳定性 桑树地埂 le Bissonnais法 石漠化区
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