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On the relative Twist Formula of l-adic Sheaves

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Acta Mathematica Sinica,english Series 2021年第1期37卷 73-94页

作者： en Lin YANG Yi Geng ZHAO School of Mathematical Sciences Peking UniversityBeijing 100871P.R.China Fakultät für Mathematik Universität Regensburg93040 RegensburgGermany

We propose a conjecture on the relative twist formula of l-adic sheaves,which can be viewed as a generalization of Kato-Saito’s *** verify this conjecture under some transversal *** also define a relative cohomological characteristic class and prove that its formation is compatible with proper push-forward.A conjectural relation is also given between the relative twist formula and the relative cohomological characteristic class.

关键词： Epsilon factor twist formula cohomological characteristic class Künneth formula

Bioinspired coloration strategy enabling perfect camouflage up to spectral dimension

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Science China Materials 2023年第10期66卷 4139-4140页

作者： Xun-en Wu Yingying Zhang Key Laboratory of Organic Optoelectronics and Molecular engineering of the Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084China

Spectral disguise as a plant is a crucial demand for camouflaging against target detection by emerging hyperspectral remote sensing and imaging spectrometry,which can discriminate military targets from vegetation back... 详细信息

关键词： perfect dimension military

The ground deformation field induced by a listric thrust fault with an overburden soil layer

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Frontiers of Earth Science 2013年第4期7卷 501-507页

作者： Shaogang ZenG Yong'en CAI Department of Geophysics Peking University Beijing 100871 China

The surface deformation field induced by a listric thrust fault with a thick, overburden soil layer is studied in this paper by the finite element method （FEM）. The results show：（a） The maximum slip induced by the buried fault is not located at upper tip of the fault, but below it. （b） The vertical displacement changes remarkably near the fault, forming a fault scarp. With the increase of the soil layer thickness, the height of the scarp is decreased for the same earthquake magnitude. （c） The strong strain zone on the surface is localized near the projection of the fault tip on the ground surface. The horizontal strains in the zone are in tension above the hanging wall and in compression above the foot wall, and the vertical strains in the zone are vice versa, which is favorable for tensile- shear, compression-shear fissures above hanging wall and foot wall, respectively.

关键词： listric thrust fault earthquake fault scarps,ground fissures finite element method (FEM)

A PCA-Based Approach for Structural Dynamics Model Updating with Interval Uncertainty

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Acta Mechanica Solida Sinica 2019年第1期32卷 105-119页

作者： Xueqian Chen Zhanpeng Shen Xin'en Liu Institute of Systems engineering China Academy of Engineering Physics(CAEP)Mianyang 621999China Shock and Vibration of engineering Materials and Structures Key Laboratory of Sichuan Province Mianyang 621999China

Uncertainty widely exists in engineering structures,making it necessary to update the finite element(FE)modeling with *** updating approach for the FE model of structural dynamics with interval uncertain parameters is proposed in this ***,the correlations between the updating parameters and the output qualities of interest are uncorrelated by the principal component analysis(PCA),and the massive samples of major principal components are obtained using the Monte Carlo ***,the massive samples of updating parameters and output qualities are obtained by reversing transformation in the PCA,and the new samples of updating parameters are re-chosen by combining the massive samples with the experimental intervals of the qualities of ***,the 95%CI of the updating parameters is estimated by the nonparametrie kernel density estimation approach,which are regarded as the intervals of updating ***,the proposed approach is validated in simple rectangular plates and the transport mirror *** updating results evidently demonstrate the feasibility and reliability of the proposed approach.

关键词： PCA-based approach Interval uncertainty Model updating Kernel density estimation

Nanobiology—Symphony of bioscience and nanoscience

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Science China(Life Sciences) 2020年第8期63卷 1099-1102页

作者： Xian-en Zhang National Laboratory of Biomacromolecules CAS Center for Excellence in BiomacromoleculesInstitute of BiophysicsChinese Academy of SciencesBeijing 100101China

Nanobiology is a typical convergence *** to better understand this dynamic research field,here,we discuss the definition,scope and research trends of *** inspiration In 1959,quantum physicist richard Feynman made a hi... 详细信息

关键词： biology. Early Feynman

New direction for surgery:Super minimally invasive surgery

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World Journal of Gastroenterology 2024年第12期30卷 1676-1679页

作者： en-Qiang Linghu Department of Gastroenterology First Medical Center of Chinese PLA General HospitalBeijing 100853China

The top goal of modern medicine is treating disease without destroying organ structures and making patients as healthy as they were before their *** invasive surgery(MIS)has dominated the surgical realm because of its lesser ***,changes in anatomical structures of the body and reconstruction of internal organs or different organs are common after traditional surgery or MIS,decreasing the quality of life of patients ***,I propose a new treatment mode,super MIS(SMIS),which is defined as“curing a disease or lesion which used to be treated by MIS while preserving the integrity of the organs”.In this study,I describe the origin,definition,operative channels,advantages,and future perspectives of SMIS.

关键词： Super minimally invasive surgery Minimally invasive surgery Treatment mode Traditional Surgery New direction for surgery

CO2 sequestration characteristics in the cementitious material based on gangue backfilling mining method

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International Journal of Mining Science and Technology 2019年第5期29卷 721-729页

作者： Peng Wang Xianbiao Mao Shen-en Chen School of Mechanics and Civil engineering China University of Mining&TechnologyXuzhou 221116China School of Civil and environmental engineering University of North Carolina at CharlotteCharlotteNC 28262USA

The increasing anthropogenic CO2 emission and global warming has challenged the China and other countries to seek new and better ways to meet the world’s increasing need for energy while reducing greenhouse gas *** overall proposition of this research is to develop a brand-new CO2 physical and chemical sequestration method by using solid waste of coal mining and cementitious material which are widely used for goaf backfilling in coal *** research developed a new testing system(constant temperature pressurized reaction chamber(CTPrC))to study the effects of different initial parameters on mineral carbonation such as different initial water-binder ratio,initial sample porosity and initial carbon dioxide *** experimental results show that the CO2 consumption ratio is 15%,10%and 7%higher with relatively high initial water-binder ratio,initial sample porosity and initial CO2 pressure within 48 *** addition,some physical and chemical evidence was found through the electron microscope scanning and XrD test to further explain the above test *** proposed research will provide critical parameters for optimizing CO2 sequestration capacity in this cementitious backfilling material with forming agent.

关键词： Gangue backfilling Goaf Carbon dioxide sequestration Mineral carbonation Cementious material

Synthesis and Structure of [Cu(OH)_2(H_2O)_2(4-C_5H_4N-COOH)_2]

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Chinese Journal of Structural Chemistry 2001年第6期20卷 478-480页

作者： ZHONG Zhao-en SUN Dao-Feng South China Medical Apparatus Coorporation Ltd. Tonghe TownTongsha Road 13Guangzhou 510515China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouFujian 350002China

The hydrothermal reaction of isonicotinic acid (4-C5H4N-COOH), Cu(ClO4)(2). 6H(2)O and water at 170 degreesC gave the title compound, [Cu(OH)(2)(H2O)(2)(4-C5H4N-COOH)(2)] (1), which was analyzed by single-crystal X-ray diffraction, The complex crystallizes in triclinic space group PY with unit cell parameters: a = 6.337(2), b = 6.894(3), c = 9.178(3). alpha = 99.40(3), beta = 105.26(3), gamma 108.17(5)degrees, V = 354.1(2)Angstrom (3), Z = 1, C12H16CuN2O8, M-r = 379.81, D-c = 1.791 Mg/m(3), F(000) 197, mu (MoK alpha) = 1.589 mm(-1). The final r and wr are 0.068 and 0.170 for 1249 observed reflections with I greater than or equal to2 sigma (I). The central copper ion is in a distorted octahedron geometry completed by two nitrogen atoms from carboxylic ligand, two oxygen atoms from hydroxyl groups and two oxygen atoms from coordinated water molecules. The intermolecular hydrogen bonding leads to the formation of a three-dimensional supramolecular structure.

关键词： hydrothermal reaction copper complex intermolecular hydrogen bonding

On water in nominally anhydrous minerals from mantle peridotites and magmatic rocks

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Science China Earth Sciences 2016年第6期59卷 1157-1172页

作者： HUI HeJiu XU YongJiang PAN Ming'en State Key Laboratory for Ore Deposit research School of Earth Sciences and Engineering Nanjing University

Trace amount of water associated with the lattice defects of nominally anhydrous minerals （NAMs） can be measured using Fourier transform infrared spectroscopy （FTIr） and secondary ion mass spectrometry （SIMS）. Lots of data on water in NAMs from different lithologies, especially mantle peridotite xenoliths, have been published. The water distribution in olivine from peridotite xenoliths often displays a diffusion profile with high water concentration in the core and low at the rim, which indicates water loss via diffusion during the ascent of host magma. On the other hand, water is homogeneously distributed in pyroxene and its concentration is typically interpreted to represent a mantle value. The water concentration of magma in equilibrium with NAM can be estimated using specific partition coefficient, from which the water content of parental magma and the mantle source can be inferred. The accuracy of this method, however, depends on the selection of appropriate partition coefficient for the system. Using hydrogen isotope compositions and H2O/Ce ratios of mantle NAMs, water source regions can be traced and water heterogeneity can be mapped in the upper mantle. Water plays an important role in the stability of cratonic mantle. The water contents and vertical distribution patterns can be significantly different among different cratonic manties, which may result from different geologic activities. However, the mantle-plume interaction may not necessarily result in significant change of water content in cratonic mantle. The estimation of the water content in the upper mantle is still largely based on geochemical models due to the limitations of data on water in mantle NAMs.

关键词： Nominally anhydrous minerals Fourier transform infrared spectroscopy Craton stability Water in the upper mantle Magma ascent rate Water in magma