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Reconstruction of Splines from Nonuniform Samples

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Acta Mathematica Sinica,English Series 2019年第2期35卷 245-256页

作者： Qing Yue ZHANG wen chang SUN College of Science Tianjin University of Technology School of Mathematical Sciences and LPMC Nankai University

In this paper, we study the reconstruction of spline functions from their nonuniform samples. We investigate the existence and uniqueness of the solution of the following problem: for given data {(x_n, y_n) : n ∈ Z}, find a cardinal spline f(x), of a given degree, satisfying yn = f(x_n), n ∈ *** necessary and/or sufficient conditions for the existence and uniqueness of the solution of the problem are derived. Finally, an example and some applications are presented to illustrate the main results.

关键词： Cardinal spline interpolation nonuniform sampling sampling set

On Support τ-tilting Modules over Endomorphism Algebras of Rigid Ob jects

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Acta Mathematica Sinica,English Series 2015年第9期31卷 1508-1516页

作者： wen chang Jie ZHANG Bin ZHU Department of Mathematical Sciences Tsinghua University School of Mathematics and Statistics Beijing institute of technology

We consider a Krull-Schmidt, Hom-finite, 2-Calabi Yau triangulated category with a basic rigid object T, and show a bijection between the set of isomorphism classes of basic rigid objects in the finite presented category pr T of T and the set of isomorphism classes of basic T-rigid pairs in the module category of the endomorphism algebra Endc（T）op. As a consequence, basic maximal objects in prT are one-to-one correspondence to basic support τ-tilting modules over Endc（T）op. This is a generalization of correspondences established by Adachi-Iyama-Reiten.

关键词： Rigid object maximal rigid object τ-rigid object finite presented category

Attribution of the Present-Day Aerosol Direct Radiative Forcing to Anthropogenic Emission Sectors

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Atmospheric and Oceanic Science Letters 2013年第5期6卷 369-374页

作者： chang wen-Yuan State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry(LAPC) Institute of Atmospheric Physics Chinese Academy of Sciences

In this study,a general circulation model coupled with a gas-phase module and an aerosol chemistry module was employed to investigate the impacts of anthropogenic emission sectors on aerosol direct radiative forcing at the top of atmosphere （TOA） in the present-day *** predictions were based on the emission inventories developed in support of the Intergovernmental Panel on Climate change （IPCC） Fifth Assessment Report （AR5）.Six emission sectors-agriculture,open biomass burning,domestic activities,industry,energy generation,and transport-were considered,with a special focus on nitrate aerosol that shows large uncertainties in current *** results show that the energy sector accounts for the largest contribution （-222 mW m-2） to global aerosol radiative forcing,with substantial negative forcing from *** of nitrate results in the transport sector yielding a global nitrate radiative forcing of-92 mW rm-2 and an internally mixed aerosol radiative forcing of-85 mW m-2,which is opposite to the positive radiative forcing predicted in the past,indicating that the transport emissions could not be a potential control target to counteract climate warming as expected *** maximum change in nitrate burden is found to be associated with agricultural emissions,which accounts for about 75％ of global ammonia gas （NH3） *** emissions account for global nitrate radiative forcing of-186 mW m-2 and internally mixed aerosols direct radiative forcing of-149 mW *** agricultural radiative forcing exceeds the radiative forcing of the industrial sector and is responsible for a large portion of negative radiative forcing over the Northern Hemisphere.

关键词： anthropogenic aerosols radiative forcing emission sector

Case synthesis of a β-chloro bulky bis-pocket corrole:Crystallographic characterization and photophysical properties

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chinese Chemical Letters 2018年第12期29卷 1888-1892页

作者： Atif Ali Fan Cheng Wei-Hong wen Xiao Ying Jaipal KANDhadi Hui Wang Hai-Yang Liu chi-Kwong chang Department of Chemistry Key Laboratory of Functional Molecular Engineering of Guangdong Province South China University of Technology Department of Applied Physics South China University of Technology State Key Laboratory of Optoelectronics Materials and Technologies Sun Yat-sen University Department of Chemistry Michigan State University

A new 2-chloro-5,10,15-tris（2,4,6-triphenylphenyl）-corrole was accidentally synthesized in an acceptable yield of 5.7% during the synthesis of its parent corrole, in which DDQ served as oxidant and chlorinating agent. The compound was well characterized by X-ray diffraction analysis,;H NMR, mass spectroscopy and absorption spectroscopy. Photophysical properties tests revealed that the chlorination caused a sharp decrease in fluorescence intensity, fluorescence life time, and fluorescence quantum *** investigation demonstrated the positive shift of redox potentials for chlorinated corrole as compared to non-chlorinated corrole.

关键词： Corrole β-Chlorination Synthesis Photophysical properties Singlet oxygen

Morphologies of Core-Shell-Cylinder-Forming ABC Star Triblock Copolymers in Nanopores

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chinese Journal of Chemical Physics 2014年第3期27卷 337-342页

作者： wen-bo Jiang wen-chang Lang Shi-ben Li Xiang-hong Wang Department of Physics Wenzhou University Wenzhou 325035 China Department of Physics Wenzhou Vocational and Technical College Wenzhou 325035 China

The self-assembly behavior of ABC star triblock copolymers can lead to a large number of nanostructures. Indeed, many new and interesting structures have already been discovered and proven to be hotspot in soft matter physics research. In this work, we introduce different phase diagrams of core-shell-cylinder-forming ABC star triblock copolymers under different conditions, including in-bulk and pore geometries with different sizes. The relation between the pore size geometries and their corresponding structures are also revealed. The different properties of the surface potential field that significantly affect the self-assembly process of ABC star triblock copolymers are investigated as well.

关键词： Nanopore ABC star triblock copolymer Core-shell-cylinder-forming

A Phenol-containing α-Diimine Ligand for Nickel-and Palladium-Catalyzed Ethylene Polymerization

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chinese Journal of Polymer Science 2019年第10期37卷 974-980,I0003页

作者： Chen Tan wen-Min Pang chang-Le Chen Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and Engineering University of Science and Technology of China

A phenol-containing dibenzhydryl-based α-diimine ligand bearing hydroxy group on para-position of aniline moiety was designed, synthesized, and investigated in Ni-and Pd-catalyzed ethylene polymerization. The Ni complex bearing hydroxy groups resulted in not only high polyethylene molecular weight(Mn up to 1.5 × 10^~6), but also significantly increased melting temperature(Tm up to 123℃) and greatly decreased branching density(33/1000 C) versus the Ni catalyst bearing OMe group on para-position of aniline moiety. This is consistent with the hypothesis that the deprotonation of the phenol moiety generated a phenoxide bearing strong electrondonating O-substituent by methylaluminoxane(MAO) cocatalyst. The Pd complexes bearing hydroxy groups exhibited similar catalytic properties to those of the Pd catalyst bearing OMe groups did.

关键词： α-Diimine Ethylene polymerization Electronic effect Palladium Nickel

Wideband radar detector based on characteristic parameters of echoes

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Journal of Systems Engineering and Electronics 2019年第5期30卷 897-904页

作者： chang Jiayun FU Xiongjun JIANG wen XIE Min School of Information and Electronics Beijing Institute of Technology

The statistical characterization of radar range cells with the target signals is much more distinct than that of the range cells with noise-only ***,the quasi-optimal detection principle based on the characteristic parameters of echo signals is adopted to develop a detector of range-spread targets in Gaussian ***,the characteristic parameters of the return signals in the entire range profiles of radar are ***,the clustering analysis of the characteristic parameter matrix is discussed to extract the test statistic of ***,the probabilities of detection and false alarm of the proposed detector are *** analysis shows that the proposed detector does not need the prior knowledge about the spatial distribution of the target scattering centers in practical scenarios,and it is simple and robust even in low signal-to-noise ratio(low-SNR)*** Carlo(MC)simulations reveal that the detection performance of the proposed detector outperforms the conventional detectors.

关键词： wideband radar mathematical statistics characteristic parameter clustering analysis

Application of rotational atherectomy in the drug-eluting stent era

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Journal of Geriatric Cardiology 2013年第3期10卷 231-216页

作者： Chun-chi Chen I-chang Hsieh Department of Second Section of Cardiology Chang Gung Memorial Hospital Chang Gung University College of Medicine Linkou 5 Fuhsing St. Tao Yuan 333 Taiwan China

Rotational atherectomy (RA) was introduced in the interventional arena in 1988 as a dedicated device for calcified lesions. Due to the complexity of the technique, the development of alternative methods such as the cutting balloon procedure, and the high restenosis rate of subsequent bare metal stenting in long lesions, its use had later declined. However, with the increasing use of drug-eluting stents (DES) and the aggressive treatment of longer lesions, the number of procedure performed with RA has increased significantly again in recent years. In this article, we reviewed the application of RA in DES era.

关键词： Drug-eluting stents Lesions Rotational atherectomy

Unhealthy aging? Featuring older people in television food commercials in china

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International Journal of Nursing Sciences 2020年第S1期7卷 67-73页

作者： wen Jiao Angela wen-Yu chang Department of Communication Faculty of Social SciencesUniversity of MacaoChina

Objectives:Advertising messages can affect the public as a risk or protective factor for socially disadvantaged groups,and they may reflect how characters reflect perceptions are perceived in a *** study aimed to investigate how older people are portrayed in televised food commercials from the approach of a healthy aging perspective in contemporary chinese ***:All televised advertising in the Ad Topic archive were screened against inclusion and exclusion criteria,and a total of 164 commercials from the years of 2016-2019 that portrayed chinese older people were *** association between the main older characters with the product categories,healthy *** foods,use of health claims,sex,type of spokesperson,companions,and tones and manners were included in the ***:Older people more frequently appeared in unhealthy food products than in healthy food *** claims involving older adults were portrayed adequately,whereas nursing professions as companions of older adults were *** advertising that delivered happy,caring,or warm tones was overwhelmingly ***,the advertising messages circulated in china represent a binary stereotype model of images of older adults'characteristics that reflect ageist and the so-called agelessism,referring to the new application of the look from the approach of social psychology and marketing ***:This study examined aging discrimination reflected in *** exploring the impact of a crisis remain *** is needed to improve the accuracy of advertised healthy older adults and normal aging.

关键词： Advertising Aged Ageism china Food Healthy aging Marketing Stereotypes