检索结果-南通市图书馆

Thermo-hydro-mechanical behavior of clay rock for deep geological disposal of high-level radioactive waste

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2018年第5期10卷 992-1008页

作者： chun-Liang Zhang Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) Repository Safety Research Division Theodor-Heuss-Str 4 Braunschweig 38122 Germany

In the context of deep geological disposal of radioactive waste in clay formations, the thermo-hydro- mechanical （THM） behavior of the indurated Callovo-Oxfordian and Opalinus clay rocks has been extensively investigated in our laboratory under repository relevant conditions：（1） rock stress covering the range from the lithostatic state to redistributed levels after excavation; （2） variation of the humidity in the openings due to ventilation as well as hydraulic drained and undrained boundary conditions; （3） gas generation from corrosion of metallic components within repositories; and （4） thermal loading from high-level radioactive waste up to the designed maximum temperature of 90 ~C and even beyond to 150 ~C, Various important aspects concerning the long-term barrier functions of the clay host rocks have been studied：（1） fundamental concept for effective stress in the porous clay-water system; （2） stress- driven deformation and damage as well as resulting permeability changes; （3） moisture influences on mechanical properties; （4） self-sealing of fractures under mechanical load and swelling]slaking of clay minerals upon water uptake; （5） gas migration in fractured and resealed claystones; and （6） thermal impact on the hydro-mechanical behavior and properties, Major findings from the investigations are summarized in this paper,

关键词： Repository Clay rock Deformability Swelling Self-sealing Water permeability Gas migration Thermal impact

Metapelitic Garnet-Muscovite-Al_2SiO_5-Quartz(GMAQ) Geothermobarometry

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2018年第5期29卷 977-988页

作者： chun-Ming Wu College of Earth and Planetary Sciences University of Chinese Academy of Sciences

The garnet-muscovite geothermometer and garnet-muscovite-Al2SiO5 -quartz （GMAQ） geobarometer have been empirically calibrated under P-T conditions of 1-12 kbar and 460-760 ℃ using natural metapelitic rocks. The chemical compositions of the calibrant muscovite are in the ranges of Fe=0.03-0.21 atoms, Mg=0.02-0.32 atoms and AI VI=1.62-1.96 atoms, respectively, on the ll-oxygen basis per formula unit. The garnet-muscovite thermometer yields similar temperature estimates to the well calibrated garnet-biotite thermometer within error of 4-55 ℃, and successfully discriminates the systematic temperature change of the different zones of either the prograde or inverted metamorphic terranes or thermal contact aureoles. The six formulations of GMAQ barometry yield similar pressure estimates to the well calibrated GASP barometer within error of ±1.2 kbar, and plot the Al2SiOs-bearing metapelite into the correct stability field of the AI2SiOs polymorphs. Moreover, the GMAQ thermobarometers show that the pressure is almost constant for every thermal contact aureole within limited geographic region, which reflects geological condition. The random errors are estimated to be of ca. 4-60 ℃ and 4-1.4 kbar for the geothermometer and geobarometer, respectively. A spreadsheet for applying GMAQ geothermo- barometry is supplied in the Electronic Supplementary Materials.

关键词： Al2SiO5 application calibration garnet geothermobarometry muscovite.

Phase-space tailoring for deterministic and in-situ regulation of photon transport

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2022年第5期65卷 141-142页

作者： chun-Hua Dong CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center For Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China

Manipulating optical fields in microcavities is of great significance in fundamental optical physics and the development of advanced optical technology[1-7].In previous work,manipulating light dynamics in optical microcavities was carried out in real or momentum *** it has been successfully applied in many fields such as quantum optics and precision measurement.

关键词： space measurement momentum

Examination of effective stress in clay rock

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2017年第3期9卷 97-107页

作者： chun-Liang Zhang Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) Braunschweig 38122 Germany

This paper examines the effective stress in indurated clay rock theoretically and experimentally.A stress concept is derived from the analysis of the microstructure and of the pore water in the highly-indurated Callovo-Oxfordian and Opalinus clay rocks,and subsequently validated by various experiments performed on these *** concept suggests that the interparticle or effective stress in a dense clay ewater system is transferred through both the adsorbed interparticle pore water in narrow pores and the solidesolid contact between non-clay mineral *** experiments show that the adsorbed pore water in the claystones is capable of bearing deviatoric effective stresses up to the failure *** applied stresses are for the most part or even totally transferred by the bound pore water,*** swelling pressure in the interparticle bound pore water is almost equivalent to the effective *** stress concept provides a reasonable view to the nature of the effective stress in argillaceous rock and forms the fundamental basis for studies of the hydro-mechanical properties and processes in clay formations.

关键词： Clay rock Stress analysis Effective stress Swelling pressure Experiment

The war between wheat and Fusarum: fighting with an alien weapon

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2020年第9期63卷 1425-1427页

作者： chun-Ming Liu Institute of Crop Sciences Chinese Academy of Agricultural SciencesBeijing 100081China Key Laboratory of Plant Molecular Physiology Institute of BotanyChinese Academy of SciencesBeijing 100093China

Wheat, as one of the most important staple food crops in the world, has been domesticated and cultivated for over5,000 years. The flour of common wheat (Triticum aestivum L.) is used daily to make different types of foods in different regions, typically bread, pizza and pasta for western countries, and noodle, dumpling and steamed bread for Asian countries. Infections of Fusarium species cause impactful diseases for cereal crops including wheat, rice, maize and barley. Outbreaks of devastating infections by Fusarium species may lead to up to 50%yield loss in these crops and the contaminations of trichothecene mycotoxins. Therefore,it is an important issue for both food security and food safety.

关键词： crops Wheat cultivated

Equivalence of three kinds of well-posed-ness of discontinuous Riemann-Hilbert problem for elliptic complex equation in multiply connected domains

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2014年第2期29卷 183-193页

作者： WEN Guo-chun LMAM School of Mathematical Sciences Peking University

In this article, we first introduce the general linear elliptic complex equation of first order with certain conditions, and then propose discontinuous Riemann-Hilbert problem and some kinds of modified well-posed-ness for the complex equation. Then we verify the equivalence of three kinds of well-posed-ness. The discontinuous boundary value problem possesses many applications in mechanics and physics etc.

关键词： Discontinuous Riemann-Hilbert problems linear elliptic complex equation equivalence of threekinds of well-posed-ness multiply connected domains.

LENTICULAR NONCOMMUTATIVE TORI

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2003年第1期23卷 83-94页

作者： chun-Gil Park Department of Mathematics Chungnam National University Daejeon 305-764 Korea

All C*-algebras of sections of locally trivial C* -algebra bundles over ∏i=1sLki(ni) with fibres Aw Mc(C) are constructed, under the assumption that every completely irrational noncommutative torus Aw is realized as an inductive limit of circle algebras, where Lki (ni) are lens spaces. Let Lcd be a cd-homogeneous C*-algebra over whose cd-homogeneous C*-subalgebra restricted to the subspace Tr × T2 is realized as C(Tr) A1/d Mc(C), and of which no non-trivial matrix algebra can be factored *** lenticular noncommutative torus Lpcd is defined by twisting in by a totally skew multiplier p on Tr+2 × Zm-2. It is shown that is isomorphic to if and only if the set of prime factors of cd is a subset of the set of prime factors of p, and that Lpcd is not stablyisomorphic to if the cd-homogeneous C*-subalgebra of Lpcd restricted to some subspace LkiLki (ni) is realized as the crossed product by the obvious non-trivial action of Zki on a cd/ki-homogeneous C*-algebra over S2ni+1 for ki an integer greater than 1.

关键词： Lens space homogeneous C*-algebra C*-algebra bundle twisted group C*-algebra noncommutative torus K-theory UHF-algebra Cuntz algebra

Riemann-Hilbert problem for first order complex equations of mixed type with degenerate curve

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2010年第3期25卷 253-263页

作者： WEN Guo-chun School of Mathematical Sciences Peking University Beijing 100871 China

This paper considers the Riemann-Hilbert problem for linear mixed（elliptichyperbolic） complex equations of first order with degenerate curve in a simply connected domain. We first give the representation theorem and uniqueness of solutions for such boundary value problem. Then by using the methods of successive iteration and parameter extension, the existence of solutions for this problem is proved.

关键词： Riemann-Hilbert problem mixed complex equations of first order degenerate curve.

ECC-Based RFID Authentication Protocol

在线全文

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology 2020年第4期18卷 320-329页

作者： Xing-chun Yang chun-Xiang Xu Chao-Rong Li Department of Computer Science and Technology Sichuan Police CollegeLuzhou 646000 School of Computer Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731 Department of Computer Science and Information Engineering Yibin UniversityYibin 644000

The radio frequency identification(RFID)technology has been widely used so far in industrial and commercial *** develop the RFID tags that support elliptic curve cryptography(ECC),we propose a scalable and mutual authentication protocol based on *** also suggest a tag privacy model that provides adversaries exhibiting strong abilities to attack a tag’s *** prove that the proposed protocol preserves privacy under the privacy model and that it meets general security *** with other recent ECCbased RFID authentication protocols,our protocol provides tag privacy and performs the best under comprehensive evaluation of tag privacy,tag computation cost,and communications cost.

关键词： Elliptic curve cryptography radio frequency identification(RFID) authentication protocol privacy