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Impact of climate change on outdoor design conditions and implications to peak loads

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Building Simulation 2022年第12期15卷 2051-2065页

作者： Xujie Huo Liu Yang Danny Hin wa Li Isaac Lun Siwei Lou Yuan Shi School of Architecture&Urban Planning Shenzhen UniversityShenzhen 518060China BenYuan Design and Research Center Shenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Architecture for Health&Well-being(in preparation) Shenzhen 518060China School of Architecture Xi’an University of Architecture and TechnologyXi’an 710055China Building Energy Research Group Department of Architecture and Civil EngineeringCity University of Hong KongHong KongChina Centre for Sustainable Energy Technologies University of Nottingham Ningbo ChinaNingbo 315100China School of Civil Engineering Guangzhou UniversityGuangzhou 510006China

This study exams the impact of climate change on outdoor design conditions and peak loads of five Chinese cities over the five major climate zones for the winter and summer *** design dry-bulb temperature(DDBT)and the coincident wet-bulb temperature(CWBT)for two 30-year periods;1971–2000 and 1984–2013 were *** was found that the DDBT of the period 1984–2013 was higher than that of the period 1971–2000,whereas the CWBT and the corresponding outdoor enthalpy of the period 1984–2013 was lower than that of 1971–2000 at the various cumulative *** trend implies that the increment in conductive heat gain through the building envelope due to the rising temperature can be lower than the reduction in fresh air load due to the lower outdoor air *** this case,the peak cooling loads may reduce in all five cities under study,and this is different from the widely held view that global warming will lead to more stringent outdoor design conditions,higher peak cooling loads and larger heating,ventilation and air conditioning(HVAC)plants than the current or historical *** implications to the“free-cooling”of HVAC systems with enthalpy control are discussed as well.

关键词： outdoor design conditions outdoor air enthalpy climate change peak loads

Reduction of residual stress in porous Ti6Al4V by in situ double scanning during laser additive manufacturing

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International Journal of Minerals,Metallurgy and Materials 2021年第11期28卷 1844-1853页

作者： Yi-wa Luo Ming-yong wang Ji-guo Tu Yu Jiang Shu-qiang Jiao State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Department of Orthopedics Peking University Third HospitalBeijing 100191China

Selective laser melting(SLM)technology plays an important role in the preparation of porous titanium(Ti)implants with complex structures and precise ***,the processing characteristics of this technology,which include rapid melting and solidification,lead to products with high residual ***,an in situ method was developed to restrain the residual stress and improve the mechanical strength of porous Ti alloys during laser additive *** brief,porous Ti6Al4V was prepared by an SLM three-dimensional(3D)printer equipped with a double laser system that could rescan each layer immediately after solidification of the molten powder,thus reducing the temperature gradient and avoiding rapid melting and *** indicated that double scanning can provide stronger bonding conditions for the honeycomb structure and improve the yield strength and elastic modulus of the *** with an energy density of 75%resulted in 33.5%–38.0%reductions in residual *** porosities of double-scanned specimens were 2%–4%lower than those of singlescanned specimens,and the differences noted increased with increasing sheet *** rescanning laser power should be reduced during the preparation of porous Ti with thick cell walls to ensure dimensional accuracy.

关键词： porous titanium selective laser melting additive manufacturing residual stress mechanical properties

Numerical investigation on the effects of current headings on vortex induced motions of a semi-submersible

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Journal of Hydrodynamics 2022年第3期34卷 382-394页

作者： Wei-wen Zhao Zhi-yuan Wei De-cheng wa Computational Marine Hydrodynamics Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China Marine Design&Research Institute of China Shanghai200011China Ocean College Zhejiang UniversityZhoushan316021China

In this paper,numerical simulations on vortex-induced motions(VIM)of a semi-submersible at two different current headings are conducted over a wide range of current *** simulations are performed with the computational fluid dynamics(CFD)solver VIM-FOAM-SJTU which is an in-house solver developed based on the OpenFOAM *** turbulent flows are resolved with a shear stress transport-delayed detached eddy simulation(SST-DDES)*** decay tests for transverse and yaw motion are performed in calm still water to make sure the equivalent stiffness is setup *** the results of VIM,including motion response,forces and moments,and flow patterns are presented and analyzed *** including transverse,in-line and yaw motion at different current headings and velocities are *** vorticity in the wake regions at different time stamps are also illustrated for different current headings and velocities.

关键词： Vortex-induced motions(VIM) vortex-induced yaw vim-FOAM-SJTU solver Reynolds stress

Adaptive Bayesian Inference for Discontinuous Inverse Problems,Application to Hyperbolic Conservation Laws

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Communications in Computational Physics 2014年第6期16卷 1-34页

作者： Alexandre Birolleau gaël Poëtte Didier Lucor CEA DAMDIFF-91297 ArpajonFrance. UPMC Univ Paris 06 UMR 7190Institut Jean Le Rond d’AlembertF-75005 ParisFrance. CNRS UMR 7190Institut Jean Le Rond d’AlembertF-75005 ParisFrance.

Various works from the literature aimed at accelerating Bayesian inference in inverse *** spectral methods have been recently proposed as surrogate approximations of the forward uncertainty propagation model over the support of the prior *** representations are efficient because they allow affordable simulation of a large number of samples from the posterior ***,they do not perform well when the forward model exhibits strong nonlinear behavior with respect to its *** this work,we first relate the fast(exponential)L2-convergence of the forward approximation to the fast(exponential)convergence(in terms of Kullback-Leibler divergence)of the approximate *** particular,we prove that in case the prior distribution is uniform,the posterior is at least twice as fast as the convergence rate of the forward model in those *** Bayesian inference strategy is developed in the framework of a stochastic spectral projection *** predicted convergence rates are then demonstrated for simple nonlinear inverse problems of varying *** then propose an efficient numerical approach for the Bayesian solution of inverse problems presenting strongly nonlinear or discontinuous system *** comes with the improvement of the forward model that is adaptively approximated by an iterative generalized Polynomial Chaos-based *** numerical approximations and predicted convergence rates of the former approach are compared to the new iterative numerical method for nonlinear time-dependent test cases of varying dimension and complexity,which are relevant regarding our hydrodynamics motivations and therefore regarding hyperbolic conservation laws and the apparition of discontinuities in finite time.

关键词： Stochastic inverse problems Bayesian inference iterative generalized Polynomial Chaos compressible gas dynamics.

Electrochemical properties of niobium and phosphate doped spherical Li-rich spinel LiMn2O4 synthesized by ion implantation method

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Chinese Chemical Letters 2017年第7期28卷 1438-1446页

作者： Wei Li gao-wa Siqin Zhi Zhu Lu Qi Wen-Huai Tian Department of Materials Physics and Chemistry School of Materials Science and EngineeringUniversity of Science and TechnologyBeijing 100083China New Energy Materials and Technology Laboratory Department of Applied ChemistryCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

Spherical Li-rich lithium manganese oxide（LMO） spinel material was synthesized by an ion implanted method assisted by polyalcohol doped with Niobium and Phosphate *** material was characterized by scanning electron microscopy,X-ray diffraction and BET specific surface area *** electrochemical performances were investigated with galvanostatic techniques and cyclic *** synthesis process was investigated with TG/*** results show that the lithium ion can be immersed into the pore of manganese dioxide at a low temperature with the ion implanted *** prepared materials have a higher discharge capacity and better crystallization than those prepared by solid phase *** doped Nb can improve the capacity of the Li-rich LMO spinel and reinforce the crystal growth along（111） and（400） *** crystal grains show circular and smooth morphology,which makes the specific surface area greatly ***-doped LMO spinel exhibits good high-rate capacity and structure *** prepared Li（1.09）Mn（1.87）Nb（0.031）O（3.99）（PO4）（0.021）delivers a discharge capacity of 119mAhg^-1 at 0.2C（1C=148mAg^-1） and 112.8 mAhg^-1 at 10 C,the discharge capacity retention reaches 98% at 1 ℃ after 50 cycles at 25 ℃ and 94% at 55 ℃.

关键词： Spinels Ion implantation Li-ion batteries LiMn2O4 Doping

Unveiling the lamellar structure of the human cornea over its full thickness using polarization-resolved SHG microscopy

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Light(Science & Applications) 2023年第9期12卷 1782-1794页

作者： Clothilde Raoux Anatole Chessel Pierre Mahou gaël Latour Marie-Claire Schanne-Klein Laboratory for Optics and Biosciences Ecole PolytechniqueCNRSINSERMInstitut Polytechnique de Paris91128 PalaiseauFrance UniversitéParis-Saclay 91190 Gif-sur-YvetteFrance

A key property of the human cornea is to maintain its curvature and consequently its refraction capability despite daily changes in intraocular *** is closely related to the multiscale structure of the corneal stroma,which consists of 1-3µm-thick stacked lamellae made of thin collagen ***,the distribution,size,and orientation of these lamellae along the depth of the cornea are poorly characterized up to *** this study,we use second harmonic generation(SHG)microscopy to visualize the collagen distribution over the full depth of 10 intact and unstained human corneas(500-600µm thick).We take advantage of the small coherence length in epi-detection to axially resolve the lamellae while maintaining the corneal physiological ***,as raw epi-detected SHG images are spatially homogenous because of the sub-wavelength size of stromal collagen fibrils,we use a polarimetric approach to measure the collagen orientation in every *** a careful validation of this approach,we show that the collagen lamellae(i)are mostly oriented along the inferior-superior axis in the anterior stroma and along the nasal-temporal axis in the posterior stroma,with a gradual shift in between and(ii)exhibit more disorder in the anterior *** results represent the first quantitative characterization of the lamellar structure of the human cornea continuously along its entire thickness with micrometric *** also shows the unique potential of P-SHG microscopy for imaging of collagen distribution in thick dense tissues.

关键词： structure curvature resolved

Identities Involving Powers and Inverse of Binomial Coefficients

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Journal of Mathematical Research and Exposition 2011年第6期31卷 1021-1029页

作者： Wu Yun G ao wa Department of Mathematics College of Sciences and Technology Inner Mongolia University Inner Mongolia 010021 P. R. China

In this paper,we give several identities of finite sums and some infinite series involving powers and inverse of binomial coefficients,which extends the results of ***.

关键词： inverse of binomial coefficient identities stirling numbers

THE STRUCTURE OF ASTERBATANOSIDE J FROM ASTER BATANGENSIS

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Chinese Chemical Letters 1995年第3期6卷 221-224页

作者： Shao, Y Zhou, BN Lin, LZ Cordell, ga Acad Sinica Shanghai Inst Mat Med Shanghai 200031 Peoples R China Univ Illinois Coll Pharm Dept Med Chem & Pharmacognosy Program Collaborat Res Pharmaceut Sci Chicago IL USA

A new medicagenic acid saponin named asterbatanoside J was isolated from the roots of Aster batangensis. On the basis of chemical and spectral studies especially 2D NMR including COSY, HETCOR, HOHAHA, ROESY and HMBC techniques, its structure has been established as 3-O-beta -D-glucopyranosyl-(1 -->6)-beta -D-glucopyranosyl-2 beta ,3 beta -dihydroxy-olean-12-en-23 alpha ,28-dioic acid-28-O-alpha -L-arabinopyranosyl-(1 -->3)-alpha -L-rhamnopyranosyl-(1 -->2)-beta -D-fucopyranoside.

关键词： ct^

The high level language for system specification: A model-driven approach to systems engineering

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International Journal of Modeling, Simulation, and Scientific Computing 2016年第1期7卷 180-214页

作者： Hamzat Olanrewaju Aliyu Oumar Maıga Mamadou Kaba Traore School of Information and Communication Technology Federal University of Technology Minna Gidan-Kwanu Campus MinnaNigeria Universit´e des Sciences des Techniques et des Technologies BamakoMali LIMOS CNRS UMR 6158 Universite Blaise Pascal Clermont-FerrandFrance

We present HiLLS(High Level Language for System Specification),a graphical formalism that allows to specify Discrete Event System(DES)models for analysis using methodologies like simulation,formal methods and ***’syntax is built from the integration of concepts from System Theory and Software Engineering aided by simple concrete notations to describe the structural and behavioral aspects of *** paper provides the syntax of HiLLS and its simulation semantics which is based on the Discrete Event System Specification(DEVS)*** DEVS-based Modeling and Simulation(M&S)perspective,HiLLS is a platform-independent visual language with generic expressions that can serve as a front-end for most existing DEVS-based simulation environments with the aid of Model-Driven Engineering(MDE)*** also suggests ways to fill some gaps in existing DEVS-based visual formalisms that inhibit complete specification of the behavior of complex *** provide a case study to illustrate the core features of the language.

关键词： HiLLS modeling and simulation integrated formalism DEVS Object-Z