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Chunyun versus lockdown

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National Science Review 2022年第1期9卷 7-8页

作者： Sune lehmann Center for Social Data Science University of Copenhagen DTU Compute Technical University of Denmark

Across the world, the news of COVID-19 was followed by ‘lockdowns’ that limited societal activity and mobility to a greater or lesser degree. In China, however, the situation was unique because the travel lockdown occurred in the middle of the year’s most hectic travel season occurring around Chinese Lunar New Year(chunyun).

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Mass spectrometric profiling of phosphorylated serine／threonine residues and（patho）physiological relevance of selected residues in insulin signal transduction and type 2 Diabetes mellitus

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Mass spectrometric profiling of phosphorylated serine／threo...

Advanced approaches to high precision MEMS metrology based on interferometric,confocal,and tactile techniques

第十五次全国色谱学术报告会

作者： rainer.lehmann University Clinic Tuebingen Dept．of Internal Medicine Div．4 EndocrinologyMetabolismPathobiochemistry and Clinical Chemistry 72076 TuebingenGermany

＜正＞Post-translational modification of proteins plays a central role in many important intracellular processes, e.g. signal transduction. Therefore, a detailed understanding of the regulation, nature, and occurrence of the modifications is the key to an understanding of the molecular mechanisms of cell signaling, both, under physiological and pathophysiological conditions.

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Optoelectronics Letters 2008年第2期4卷 143-146页

作者： Peter lehmann Mahr GmbH 37073 Goettingen Germany

Geometrical features of micro-systems can be determined by either tactile or optical profiling techniques, which show different non-linear transfer characteristics. This has to be considered especially, if the instruments operate close to their physical limitations. Depending on the specific measuring task either point-wise or areal optical measurement may be advantageous. Hence, examples for both approaches are discussed. Furthermore, systematic effects, which are related to the measuring principle have to be taken into account, e.g. if sharp edges or slopes are present on the measuring object. As it is shown, for white-light interferometry these difficulties can be solved by a two-wavelength technique.

关键词：精密度 MEMS 计量方法干涉测量触摸技术

Friction between a temperature dependent viscoelastic body and a rough surface

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Friction 2016年第1期4卷 50-64页

作者： rainer HEISE Institute for Mechanics Technische Universit(a)t Berlin Straβe des 17.Juni 135 Berlin D-10623 Germany

In this study, we investigate the friction between a one-dimensional elastomer and a one-dimensional rigid randomly rough surface. Special emphasis is laid on the temperature dependence of the elastomer and its effect on the frictional behavior of the contact. The elastomer is modeled as a Kelvin body in a one-dimensional substitute model in the spirit of the method of dimensionality reduction. The randomly rough surface is a self-affine one-dimensional fractal. We provide a short discussion of a conical indenter pressed in a displacement controlled process into an elastomer. These analytical considerations are taken as a basis for the treatment of the randomly rough counter surface in contact to an elastomer with and without temperature dependent viscosity. We identify dimensionless quantities describing this process, introduce a thermal length scale, and give estimates for the coefficient of friction as function of velocity, indentation and thermal quantities.

关键词： elastomer friction temperature dependence coefficient of friction

Stochastic Differential Games with Reflection and Related Obstacle Problems for Isaacs Equations

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Acta Mathematicae Applicatae Sinica 2011年第4期27卷 647-678页

作者： rainer BUCKDAHN Département de Mathématiques Université de Bretagne Occidentale6avenue Victor-le-GorgeuB.P.80929285 Brest cedexFrance Institute for Advanced Study Shangdong UniversityJinan 250100China

In this paper we first investigate zero-sum two-player stochastic differential games with reflection, with the help of theory of Reflected Backward Stochastic Differential Equations （RBSDEs）. We will establish the dynamic programming principle for the upper and the lower value functions of this kind of stochastic differential games with reflection in a straightforward way. Then the upper and the lower value functions are proved to be the unique viscosity solutions to the associated upper and the lower Hamilton-Jacobi-Bettman-Isaacs equations with obstacles, respectively. The method differs significantly from those used for control problems with reflection, with new techniques developed of interest on its own. Further, we also prove a new estimate for RBSDEs being sharper than that in the paper of E1 Karoui, Kapoudjian, Pardoux, Peng and Quenez （1997）, which turns out to be very useful because it allows us to estimate the LP-distance of the solutions of two different RBSDEs by the p-th power of the distance of the initial values of the driving forward equations. We also show that the unique viscosity solution to the approximating Isaacs equation constructed by the penalization method converges to the viscosity solution of the Isaacs equation with obstacle.

关键词： stochastic differential games value function reflected backward stochastic differential equations,dynamic programming principle Isaacs equations with obstacles viscosity solution

Influence of slant of objective on image formation in optical microscopes

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Chinese Optics Letters 2008年第8期6卷 603-606页

作者： rainer Kning Physikalisch-Technische Bundesanstalt Braunschweig Bundesallee 10038116 BraunschweigGermany

A microscope image formation model based on scalar diffraction and Fourier optics has been developed, which takes a slant angle between the optical axis and the observed surface into account. The theoretical investigations of the imaging of line structures using this model show that reflection type microscopes are much stronger influenced by the slant angle than transmission type microscopes. In addition, the slant angle changes the image contrast and the image shape of a line structure, especially its edge. The larger the slant angle, the stronger the decrease of the image contrast, and the less steep the edge slope in both types of microscopes. Furthermore, the larger the numerical aperture of the objective, the less the effect of the slant angle on the line image shape.

关键词： line this

Viscoelasticity and shear resistance at the aggregate scale of structured and organic carbon-free Chernozems

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Pedosphere 2023年第5期33卷 754-764页

作者： Christoph HAAS rainer HORN Philipp SAGGAU rainer DUTTMANN Institute for Plant Nutrition and Soil Science University of KielKiel 24118Germany Department of Geography Division of Landscape Ecology and Geoinformation SciencesUniversity of KielKiel 24118Germany

Soil rheology characterises the flow behaviour of soils at the particle-particle to aggregate *** sweep tests(ASTs)are often the method of choice for parameterizing soil flow properties,such as the shear strain values at the end of the linear viscoelastic range(i.e.,the deformation is mainly elastic)and at the yield point(i.e.,elastic equals plastic deformation).Samples from seven soil profiles and five soil depths of Chernozems,collected in the Maidanetske study area,close to Uman City of Ukraine,were analysed to evaluate the effect of soil organic carbon(SOC)on the parameters related to soil microstructural stability derived from *** organic carbon was removed with H_(2)O_(2)to determine the soil texture-dependent values of soil rheological properties,which were compared to the values determined for samples with intact water-stable *** shear resistance-related parameters increased for aggregated soil samples compared to SOC-free soil samples,indicating an increase in soil stability due to *** contrast,the values of the overall viscoelasticity and the shear strain were reduced for aggregated soil samples,indicating decreased soil *** functions were applied to predict the shear strain-dependent loss and storage moduli and shear stress values as a function of SOC *** particles(630–2000μm)and volumetric water content improved the *** conclude that increased SOC content,through the gluing and cementing effects of SOC and altered aggregate shapes compared to SOC-free soil materials,contributes to higher microstructural ***,the increased water content in the SOC-containing soil samples reversed soil strengthening *** was due to the fact that a more rapid increase in positive water pressure under shear stress weakened the samples and the spherical aggregates began to rotate more easily,thus loosing energy,when compared to platy particles of the SOC-free soil materials.

关键词： aggregation rheology shear strain shear stress soil organic carbon depletion soil stability

CONVERSATION WITH THE ENGINEER: BEYOND GREEN BUILDINGS-ENTERING THE ECOLOGICAL AGE

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Journal of Green Building 2010年第3期5卷 43-49页

作者： Steffen lehmann Peter Head University of South Australia Arup

Arup,the global design,engineering,and business consultancy,is the creative force behind many of the world’s most innovative and sustainable buildings and transport and civil engineering *** over 60 years ago,Arup has operated in China for more than three decades,and almost a quarter of their worldwide staff of 9,000 is based in Hong Kong and *** was initially commissioned by the Shanghai Industrial Investment Corporation in 2006 to put forward concept proposals for a new sustainable city:Wanzhuang Eco-City,located in Hebei *** for the 80 sq km site are now being guided by a Development Strategy,the Preliminary Control Plan and Sustainability Design *** engineer Peter Head has been a director at Arup since 2004 and is based in *** is chairman of global planning and leads the company’s planning and integrated urbanism business,which includes development planning,economics and policy,integrated urbanism,transport and environmental consulting and sustainable devel*** his early career,Peter worked at the forefront of steel bridge technology,and in 1998 he was awarded an OBE for his services to bridge *** is also chairman of the Steel Construction *** was appointed a Commissioner on the London Sustainable Development Commission in 2002,representing the construction ***,he was a member of the group that drafted the Sustainable Development Framework for London,which led an initiative to create a voluntary code of practice for sustainable planning,design,and construction of London’s built *** the last decade or so,Peter has been dedicated to overthrowing the notion that urbanization is inevitably the fast track to environmental ***,he is fighting to ensure that a growing number of the world’s mega cities,and the associated mega projects,embrace sustainability principles from the out*** 2004 to 2008 he was project director for the Dongtan Eco-City

关键词： ecological age rapid urbanization China decarbonizing energy supply

Inf-convolution of G-expectations

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Science China Mathematics 2010年第8期53卷 1957-1970页

作者： BUCKDAHN rainer Laboratoire de Math'ematiques CNRS-UMR 6205Universite' de Bretagne Occidentale

In this paper we will discuss the optimal risk transfer problems when risk measures are generated by G-expectations,and we present the relationship between inf-convolution of G-expectations and the infconvolution of d... 详细信息

关键词： inf-convolution G-expectation G-normal distribution G-Brownian motion