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Structural and tectonothermal evolution of the ultrahigh-temperature Bakhuis Granulite Belt,Guiana Shield,Surinam:Palaeoproterozoic to recent

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Geoscience Frontiers 2021年第2期12卷 677-692页

作者： frank F.Beunk Emond w.F.de Roever Keewook Yi Fraukje M.Brouwer Faculty of Science Geology and Geochemistry ClusterVrije Universiteit Amsterdam(VUA)De Boelelaan 10851081HVAmsterdamthe Netherlands Division of Earth and Environmental Sciences Korean Basic Science InstituteOchang363-833South Korea

we constrain the multistage tectonic evolution of the Palaeoproterozoic UHT metamorphic(P=0.9–1.0 GPa,T>1000℃,t=2088–2031 Ma)Bakhuis Granulite Belt(BGB)in Surinam on the Guiana Shield,using large-to small-scale structures,Al-in-hornblende thermobarometry and published fluid inclusion and zircon geochronological *** BGB forms a narrow,NE–Sw striking belt between two formerly connected,~E–w oriented granite-greenstone belts,formed between converging Amazonian and west African continental masses prior to collision and Transamazonian *** detrital zircon in BGB metasediments conforms agewise to Birimian zircon of west Africa and suggests derivation from the subsequently subducted African passive ***-temperature metamorphism may have followed slab break-off and asthenospheric heat *** metamorphic structures result from layer-parallel shearing and folding,reflecting initial transtensional exhumation of the subducted African margin after slab break-off.A second HT event involves intrusion,at ca.0.49 GPa,of charnockites and metagabbros at 1993–1984 Ma and a layered anorthosite at 1980 Ma,after the BGB had already cooled toward subduction under the greenstone belts,along a new active margin to their south.A pronounced syntaxial bend in the new margin points northward towards the BGB and is likely the result of indentation by an anticlinorial flexural bulge of the subducting *** of the subducting oceanic plate along this bulge explains why the charnockites are restricted to the *** BGB subsequently experienced doming under an extensional detachment exposed in its southwestern border *** was focused in the BGB as a result of the flexural bulge in the subducting plate and localised heating of the overriding plate by charnockite *** present,straight NE–Sw long-side boundaries of the BGB are superimposed mylonite zones,overprinted by pseudotachylites,previously dated

关键词： Bakhuis granulite belt Guiana shield Transamazonian orogeny UHT metamorphism Tectonics P-T-t evolution

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含双腐蚀缺陷管道的氢浓度分布模拟

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中国腐蚀与防护学报 2024年第2期44卷 335-344页

作者：郭诗雯吴浩志董绍华陈林程玉峰中国石油大学(北京)安全与海洋工程学院北京102249 中国石油大学(北京)应急管理部油气生产安全与应急技术重点实验室北京102249 Schulich School of Engineering University of CalgaryCalgary T2N 1N4

为了研究含双腐蚀缺陷管道上的氢浓度分布规律,本文建立了应力场和氢扩散场耦合的有限元模型,针对双腐蚀缺陷间的应力耦合行为,探究了腐蚀缺陷长度、缺陷间距以及管道所受拉伸应变对管材中氢扩散富集行为的影响机制。结果表明,腐蚀缺陷... 详细信息

为了研究含双腐蚀缺陷管道上的氢浓度分布规律,本文建立了应力场和氢扩散场耦合的有限元模型,针对双腐蚀缺陷间的应力耦合行为,探究了腐蚀缺陷长度、缺陷间距以及管道所受拉伸应变对管材中氢扩散富集行为的影响机制。结果表明,腐蚀缺陷的存在导致氢原子在管道内发生局部富集,富集区最大氢浓度数值随拉伸应变的增大和缺陷长度的减小而升高,同时,最大氢浓度位置发生改变。而双缺陷在间距足够大时不再对氢扩散和富集产生叠加影响,可看作两个独立的缺陷。研究成果为含双腐蚀缺陷管道在输氢环境中的安全评价提供了理论支撑。

关键词：双腐蚀缺陷氢分布有限元模拟 X52 管线钢

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INITIAL VALUE TECHNIQUES FOR THE HELMHOLTZ AND MAXwELL EQUATIONS

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Journal of Computational Mathematics 2007年第3期25卷 368-373页

作者： frank Natterer Olga Klyubina Department of Mathematics University of MünsterGermany

we study the initial value problem of the Helmholtz equation with spatially variable wave number. we show that it can be stabilized by suppressing the evanescent waves. The stabilized Helmholtz equation can be solved numerically by a marching scheme combined with FFT. The resulting algorithm has complexity n^2 log n on a n x n grid. we demonstrate the efficacy of the method by numerical examples with caustics. For the Maxwell equation the same treatment is possible after reducing it to a second order system. we show how the method can be used for inverse problems arising in acoustic tomography and microwave imaging.

关键词： Stability of elliptic initial value problems Parabolic wave equation Inverseproblems in acoustics and electromagnetics.

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Progress in twin roll casting of magnesium alloys: A review

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Journal of Magnesium and Alloys 2021年第2期9卷 362-391页

作者： Amjad Javaid frank Czerwinski CanmetMATERIALS Natural Resources CanadaHamiltonOntarioL8P 0A5Canada

Twin roll casting was commercialized for a strip production from ferrous and non-ferrous alloys in the 1950 s;however,its application to magnesium has proven difficult and still creates major *** report describes global efforts in expanding manufacturing capabilities of magnesium sheet through twin roll casting path,offering many benefits,including a reduction in number of processing steps and energy *** addition to hardware design,alloy transformation during processing,product microstructure and properties,examples of successful solutions along with present technology and knowledge limitations are discussed.A particular attention is paid to developments at Canmet MATERIALS,having the only in North America pilot scale twin roll casting facility,devoted to *** are described that aim at design of new magnesium alloys,which could take advantage of unique processing conditions during twin roll casting and contribute to the overall progress in magnesium sheet manufacturing.

关键词： Twin roll casting Magnesium alloys Solidification Magnesium sheet

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Transcomplementation, but not Physical Association of the CC-NB-ARC and LRR Domains of Tomato R Protein Mi-1.2 is Altered by Mutations in the ARC2 Subdomain

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Molecular Plant 2008年第3期1卷 401-410页

作者： Gerben van Ooijen Gabriele Mayr Mario Albrecht Ben J. C. Cornelissen frank L.w. Takken Plant Pathology Swammerdam Institute for Life Sciences University of Amsterdam PO Box 94062 1090 GB Amsterdam the Netherlands Max Planck Institute for Informatics Stuhlsatzenhausweg 85 66123 Saarbrücken Germany

Race-specific disease resistance in plants is mediated by Resistance （R） proteins that recognize pathogen at- tack and initiate defence responses. Most R proteins contain a central NB-ARC domain and a C-terminal leucine-rich repeat （LRR） domain. we analyzed the intramolecular interaction of the LRR domain of tomato R protein Mi-1.2 with its N- terminus. we expressed the CC-NB-ARC and LRR parts in trans and analyzed functional transcomplementation and physical interactions. we show that these domains functionally transcomplement when expressed in trans. Known autoactivating LRR domain swaps were found to induce a hypersensitive response （HR） upon co-expression. Likewise, autoactivating mutants in the NB subdomain transcomplemented to induce HR. Point mutations in the ARC2 subdomain that induce strong autoactivation in the full-length Mi-1.2 protein, however, fail to induce HR in the transcomplementation assay, These data indicate distinct functions for the NB-ARC subdomains in induction of HR signalling. Furthermore, dissociation of the LRR is not required to release its negative regulation, as in all combinations of CC-NB-ARC and LRR domains tested, a physical interaction was observed.

关键词： RESISTANCE PROTEIN DISEASE RESISTANCE NUCLEOTIDE-BINDING CELL-DEATH HYPERSENSITIVE RESPONSE

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Numerical and experimental investigation of sloshing under large amplitude roll excitation

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Journal of Hydrodynamics 2021年第4期33卷 787-803页

作者： Ronja Hoch frank-Hendrik wurm Institute of Turbomachinery University of RostockRostockGermany

To enable a virtual design and optimization process of partially filled coolant tanks a reliable numerical approach is needed to predict the liquid and gas two phase flow inside the *** this study numerical results are validated by experimental data to examine the suitability of the method for the tank design *** liquid motion inside the tanks can be described as sloshing with high amplitude,off-resonant roll excitation and was examined using a homogeneous multiphase model and VOF interface capturing approach as well as an experimental setup including piezoelectric pressure sensors and qualitative observation of the free *** effect of two vertical baffles on the maximum pressure and the position of phase interface was *** comparison between the computational and experimental results reveals that the numerical model tends to under predict the experimental peak pressures but resolves the liquid surface in close agreement with the experiments.

关键词： Multiphase flows sloshing unsteady Reynolds averaged Navier-Stokes(URANS)

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Articulated dental cast analysis of asymptomatic and symptomatic populations

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International Journal of Oral Science 2016年第2期8卷 126-132页

作者： frank E Cordray Department of Orthodontics College of Dentistry Ohio State University Columbus USA

Dental instrumentation has long provided insight into the mechanism of musculo-skeletal function of the gnathic system. while large population studies associate dental arch displacement （DAD）, especially laterally, with symptoms, mandibular condyle displacement （CD） resulting from DAD has not been targeted as possibly etiologic in the production of common muscle contraction headache （CMCH） and temporo-mandibular dysfunction （TMD）. The objective was to evaluate the three-dimensional nature of DAD and CD between the seated condylar position （SCP） and the intercuspal position （ICP） and to compare results derived from large deprogrammed asymptomatic and symptomatic populations. A total of 1 192 sets of dental casts collected from asymptomatic and symptomatic populations were articulated in the SCP. The initial occlusal contact, DAD, and condylar displacement were evaluated for frequency, direction, and magnitude of displacement between the SCP and ICP. The data revealed significant displacement between the SCP and ICP of the condyles （displaced most frequently inferior （down） and posterior （distal）） and substantially increased frequency and magnitude of displacement of the dental arches （with posterior premature occlusal contacts, increased overjet, decreased overbite, midline differences, and occlusal classification changes） in symptomatic subjects. These discrepancies were statistically significant and clinically significant. The data support the concept of increased DAD and CD with dysfunction. Transverse condylar displacement, commonly presenting with dental cross bite, may be associated with CMCH and TMD. Displacement of the mandibular condyle may be an etiologic factor in CMCH and dysfunction of the temporo-mandibular joint.

关键词： dental arch displacement condylar displacement seated condylar position intercuspal position musculo-skeletaldysfunction temporo-mandibular dysfunction common muscle contraction headache

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Comparing the Upper Triassic Deep-sea Flysch of the Shannan Terrane with the Coeval Shallow Shelf Sediments of the Tethys Himalaya,Southern Tibet

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Acta Geologica Sinica(English Edition) 2021年第2期95卷 348-354页

作者： LI Xianghui frank MATTERN School of Earth Sciences and Engineering Nanjing UniversityNanjing 210023China College of Science Earth Science DepartmentSultan Qaboos UniversityAl-KhodPO Box 36Sultanate of Oman

The provenance and paleogeography of the Upper Triassic deep-sea flysch Langjiexue Group(LG)of the Shannan Terrane in the northeastern Himalaya orogen,south of Yarlung Zangbo,have been disputed in recent years since its affinity to the Tethys Himalaya was suspected during the early 2000 *** on the earlier discoveries of the Upper Permian–Triassic basalts and mafic dykes from the LG and of coeval detrital zircons from the Qulonggongba Formation(QF)in shallow shelf sediments of the Tethys Himalaya,the previous viewpoints on the basin and tectonics of the LG have been recently *** compared the two units of the Upper Triassic,and our results reveal a number of differences,discrepancies,and inconsistencies in the debate,raising crucial questions on the postulation and provenance model of the remote Gondwanide Orogen for the *** is suggested that more observations and evidence are needed to further improve the paleogeographic understanding and relationship of the two units.

关键词： sedimentology paleogeography flysch shelf sediment Late Triassic Shannan Terrane Tethys Tibet

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差异化城市社区养老服务的适应性供给

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贵州师范大学学报（社会科学版） 2024年第1期 97-106页

作者：龙斧李玉霞武汉大学社会学院湖北武汉430072 武汉大学战略决策研究中心湖北武汉430072 昆山杜克大学江苏昆山235100

当前,我国城市人口老龄化、高龄化现象严重,城市养老服务的供给压力随之越来越大。基于适应性供给研究视角发现,在城市化水平、社区治理能力、社区区位等因素共同作用下,社区资源禀赋及其形塑的社区支持体系差异化程度不断扩大,这就要... 详细信息

当前,我国城市人口老龄化、高龄化现象严重,城市养老服务的供给压力随之越来越大。基于适应性供给研究视角发现,在城市化水平、社区治理能力、社区区位等因素共同作用下,社区资源禀赋及其形塑的社区支持体系差异化程度不断扩大,这就要求城市社区养老服务开展分类式、针对性供给。研究通过对武汉城市社区的调研,以适应性供给为视角,发现新开发商品房社区适宜以市场化为导向走“企业+养老”服务供给模式;后单位制社区适宜依托内生力量发展社会性互助养老;棚改、村转居社区应注重政府行政力量的介入,优先解决老年人基础性公共福利及养老公共服务,满足老年人群体多元化需求。

关键词：社区养老服务社区资源适应性供给资源禀赋

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Novel Isatin-Schiff Base Cu (II) and Ni(II) Complexes. X-ray Crystal Structure of Bis[3-(4-hexylphenylimino)-1H-indol-2(3H)-one]-dichlorocopper(II) Complex

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Chinese Chemical Letters 2006年第2期17卷 243-246页

作者： Ayse ERCAG Sema Oztürk YILDIRIM Mehmet AKKURT Mahmure Ustün OZGUR frank w. HEINEMANN Istanbul University Engineering Faculty Chemistry Department Avcilar Istanbul Turkey 34320 Department of Physics Faculty of Arts and Sciences Erciyes University Kayseri Turkey 38039 Yildiz Technical University Faculty of Arts and Sciences Chemistry Department Davutpasa Istanbul Turkey 34210 Institut für Inorganische Chemie UniversittErlangen-Nürnberg Egerlandstrasse 1 D-91058 Erlangen Germany

Schiff base ligand （HL） derived from 4-hexylaniline with isatin （1H-indole-2,3-dione） and its complexes with Cu（Ⅱ）, Ni（Ⅱ） were prepared and characterized by analytical, spectroscopic （IR, UV-Vis, Mass） techniques, electrical conductivity, magnetic and thermal measurements. The crystal and molecular structure of [Cu（HL）2Cl2] was determined by a single-crystal X-ray diffraction study. The molecular structure of the title compound has an inversion center on the Cu atom.

关键词： Mononuclear Cu(Ⅱ) and Ni(Ⅱ) complexes isatin-anilines Schiff base crystal structure.

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