检索结果-南通市图书馆

convergence Analysis of Iterative Sequences for a Pair of Mappings in Banach Spaces

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2008年第3期24卷 463-470页

作者： Liu chuan ZEnG n.c.wong J.c.YAO Department of Mathematics Shanghai Normal University Shanghai 200234 P. R. China Department of Applied Mathematics National Sun Yat-Sen University Kaohsiung Taiwan 80424

Let c be a nonempty closed convex subset of a real Banach space E. Let S ： c→ c be a quasi-nonexpansive mapping, let T ： c→c be an asymptotically demicontractive and uniformly Lipschitzian mapping, and let F ：= {x ∈c ： Sx = x and Tx = x}≠Ф Let {xn}n≥0 be the sequence generated irom an arbitrary x0∈cby xn＋i=（1-cn）Sxn＋cnT^nxn, n≥*** prove the necessary and sufficient conditions for the strong convergence of the iterative sequence {xn} to an element of F. These extend and improve the recent results of Moore and nnoli.

关键词： quasi-nonexpansive mapping asymptotically demicontractive type mapping iterative sequence convergence analysis

维普期刊数据库

Recent advances on iron-catalyzed coupling reactions involving organolithium reagents

在线全文

学校读者我要写书评

暂无评论

chinese chemical Letters 2019年第8期30卷 1463-1467页

作者： Zhuliang Zhong Xiao-Shui Peng Henry n.c.wong Department of chemistry and State Key Laboratory of Synthetic Chemistry The Chinese University of Hong Kong

Owing to their inexpensive and environmentally friendly properties,iron-based catalysts have been actively investigated for new organic *** this account,we summarized our recent results on iron-catalyzed cross-coupling reactions and homo-coupling *** iron-based catalysts,we constructed diverse carbon-carbon bonds,i.e.,c(sp^2)-c(sp^3),c(sp^3)-c(sp^3),c(sp^3)-c(sp^2)and c(sp^2)-c(sp^2)*** order to demonstrate the usefulness of our iron protocol,we also carried out these reactions on gram-scale reactions,leading to good yields.

关键词： Iron-catalyzed cross-coupling Homo-coupling Organolithium Gram-scale

维普期刊数据库

Synthesis of tetraphenylene derivatives and their recent advances

在线全文

学校读者我要写书评

暂无评论

national Science Review 2017年第6期4卷 892-916页

作者： Jian-Wei Han Xiao-Shui Peng Henry n.c.wong Shanghai-Hong Kong Joint Laboratory in chemical Synthesis Shanghai Institute of Organic ChemistryChinese Academy of Sciences Key Laboratory for Advanced Materials Institute of Fine Chemicals School of Chemistry & Molecular Engineering East China University of Science and Technology Department of chemistry Center of Novel Functional Molecules Institute of Molecular Functional Materials and State Key Laboratory of Synthetic ChemistryThe Chinese University of Hong Kong

The synthetic strategies towards tetraphenylene derivatives are comprehensively summarized in this *** advances in the functionalized tetraphenylene skeleton for research into their structurally unique properties are ... 详细信息

关键词： tetraphenylene aromatic chiral carbocycles eight-membered rings

Spectral control of nonclassical light pulses using an integrated thin-film lithium niobate modulator

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2022年第12期11卷 2922-2930页

作者： Di Zhu changchen chen Mengjie Yu Linbo Shao Yaowen Hu cJXin Matthew Yeh Soumya Ghosh Lingyan He christian Reimer neil Sinclair Franco n.c.wong Mian Zhang Marko Loncar John A.Paulson School of Engineering and Applied Sciences Harvard UniversityCambridgeMA 02138USA Institute of Materials Research and Engineering Agency for ScienceTechnology and Research(A*STAR)Singapore 138634Singapore Research Laboratory of Electronics Massachusetts Institute of TechnologyCambridgeMA 02139USA HyperLight corporation 1 Bow StreetSuite 420CambridgeMA 02139USA Division of Physics Mathematics and Astronomyand Alliance for Quantum Technologies(AQT)California Institute of TechnologyPasadenaCA 91125USA

Manipulating the frequency and bandwidth of nonclassical light is essential for implementing frequency-encoded/multiplexed quantum computation,communication,and networking protocols,and for bridging spectral mismatch among various quantum ***,quantum spectral control requires a strong nonlinearity mediated by light,microwave,or acoustics,which is challenging to realize with high efficiency,low noise,and on an integrated ***,we demonstrate both frequency shifting and bandwidth compression of heralded single-photon pulses using an integrated thin-film lithium niobate(TFLn)phase *** achieve record-high electro-optic frequency shearing of telecom single photons over terahertz range(±641 GHz or±5.2 nm),enabling high visibility quantum interference between frequency-nondegenerate photon *** further operate the modulator as a time lens and demonstrate over eighteen-fold(6.55 nm to 0.35 nm)bandwidth compression of single *** results showcase the viability and promise of on-chip quantum spectral control for scalable photonic quantum information processing.

关键词： quantum lithium film

cRYSTAL STRUcTURES OF 1,2-BEnZO[2.2]PARAcYcLOPHAnE AnD 1,2-BEnZO[2.2]PARAcYcLOPHAnE-1,7-DIEnE

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

结构化学 1985年第3期 214-217页

作者：黄乃正陈展榮麥松威 Department of chemistry The chinese University of Hong Kong Shatin new Territories Hong Kong

c20H16 (1) Mr = 256.34 and c20H14 (2), Mr = 254.32 are isomorphous, orthorhombic, P212121, Z = 4. For (?), ?a= 7.116(1), b =7.874(2), c = 24.564(4) A, V = 1376.4(3) A3, Dx = 1.237 g cm-3, μ(Mo-K α) =0.65 cm-1 , final R = 0.047 for 1152 observed reflections; for 2, a=6.963(2), b = 7.985(4), c = 24.315(8) A, V = 1351.9(8) A3, Dx = 1.250 g cm-3,μ(Mo-Kα) = 0.66 cm-1 , final R = 0.076 for 886 observed data. Structuralfeatures are similar to those of the parent [2.2]paracyclophane and related derivatives.

关键词： parent orthorhombic fused substitution benzene morethan bonds diene adequately allowed

Use of Silicon Substituents in the Syntheses of natural and non-natural Molecules

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

chinese Journal of chemistry 2005年第8期23卷 1106-1108页

作者： wong, Henry n. c. Department of chemistry Institute of Chinese Medicine and Central Laboratory of Institute of Molecular Technology for Drug Discovery and Synthesis The Chinese University of Hong Kong Shatin New TerritoriesHong Kong SAR China

Trimethylsilyl groups have been used in our research as a director as well as a bulky and lipophilic group in our quest for natural and non-natural molecules.

关键词： trimethylsilyl bulky group lipophilic group

Silk-based nerve guidance conduits with macroscopic holes modulate the vascularization of regenerating rat sciatic nerve

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

neural Regeneration Research 2025年第6期20卷 1789-1800页

作者： carina Hromada Patrick Heimel Markus Kerbl LászlóGál Sylvia nürnberger Barbara Schaedl James Ferguson nicole Swiadek Xavier Monforte Johannes c.Heinzel Antal nógrádi Andreas H.Teuschl-Woller David Hercher Department Life Science Engineering University of Applied Sciences Technikum WienViennaAustria Austrian cluster for Tissue Regeneration ViennaAustria Ludwig Boltzmann Institute for Traumatology The Research Center in Cooperation with AUVAViennaAustria University clinic of Dentistry Medical University of ViennaViennaAustria Department of Plastic Reconstructive and Aesthetic SurgeryLandesklinikum Wiener Neustadt2700 Wiener NeustadtAustria Department of Anatomy Histology and EmbryologyAlbert Szent-Györgyi Medical SchoolUniversity of SzegedSzegedHungary Medical University of Vienna Department of Orthopedics and Trauma SurgeryDevision of Trauma SurgeryViennaAustria Department of Hand- PlasticReconstructive and Burn SurgeryBG Unfallklinik TuebingenUniversity of TuebingenTuebingenGermany

Peripheral nerve injuries induce a severe motor and sensory deficit. Since the availability of autologous nerve transplants for nerve repair is very limited, alternative treatment strategies are sought, including the use of tubular nerve guidance conduits(tnGcs). However, the use of tnGcs results in poor functional recovery and central necrosis of the regenerating tissue, which limits their application to short nerve lesion defects(typically shorter than 3 cm). Given the importance of vascularization in nerve regeneration, we hypothesized that enabling the growth of blood vessels from the surrounding tissue into the regenerating nerve within the tnGc would help eliminate necrotic processes and lead to improved regeneration. In this study, we reported the application of macroscopic holes into the tubular walls of silk-based tnGcs and compared the various features of these improved silk^(+) tnGcs with the tubes without holes(silk^(–) tnGcs) and autologous nerve transplants in an 8-mm sciatic nerve defect in rats. Using a combination of micro-computed tomography and histological analyses, we were able to prove that the use of silk^(+) tnGcs induced the growth of blood vessels from the adjacent tissue to the intraluminal neovascular formation. A significantly higher number of blood vessels in the silk^(+) group was found compared with autologous nerve transplants and silk^(–), accompanied by improved axon regeneration at the distal coaptation point compared with the silk^(–) tnGcs at 7 weeks postoperatively. In the 15-mm(critical size) sciatic nerve defect model, we again observed a distinct ingrowth of blood vessels through the tubular walls of silk^(+) tnGcs, but without improved functional recovery at 12 weeks postoperatively. Our data proves that macroporous tnGcs increase the vascular supply of regenerating nerves and facilitate improved axonal regeneration in a short-defect model but not in a critical-size defect model. This study suggests that further optimizatio

关键词： axon regeneration blood vessel functional recovery macroporous nerve lesion peripheral nerve repair sciatic nerve silk-based nerve guidance conduit vascularization

维普期刊数据库

convergence of Hybrid Steepest-Descent Methods for Generalized Variational Inequalities

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2006年第1期22卷 1-12页

作者： Liu chuan ZEnG n. c. wong J. c. YAO Department of Mathematics Shanghai Normal University Shanghai 200234 P. R. China Department of Applied Mathematics National Sun Yat-sen University Kaohsiung Taiwan 804

In this paper, we consider the generalized variational inequality GVI（F, g, c）, where F and g are mappings from a Hilbert space into itself and c is the fixed point set of a nonexpansive mapping. We propose two iterative algorithms to find approximate solutions of the GVI（F,g, c）. Strong convergence results are established and applications to constrained generalized pseudo-inverse are included.

关键词： iterative algorithms hybrid steepest-descent methods nonexpansive mappings Hilbert space constrained generalized pseudo-inverse

Green ionic metal-organic frameworks as nanocatalysts for cO_(2)fixation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

nano Research 2025年第1期18卷 260-269页

作者： nuria Martín Miguel Maireles-Porcar Julián Sánchez Velandia Belén Altava Francisco G.cirujano Eduardo García-Verdugo Departamento de Química Inorgánica y Orgánica Universidad Jaume IAv.Sos Baynats/nCastellóde la PlanaCastellón 12071Spain

co,ni,and Zn iso-reticular coordination polymers of 2,5-dihydroxyterphthalic acid(H_(2)dot)can be rapidly obtained under room temperature and aqueous conditions using either sodium or ammonium hydroxide as the bases to deprotonate the *** use of metal bromides and tetrabutylammonium hydroxide(TBAOH)as the base allows the green synthesis of ionic metal-organic frameworks(MOFs),characterized by X-ray diffraction(XRD),Fourier transform infrared(FTIR),scanning electron microscopy(SEM),thermo gravimetric analysis(TGA),H-nuclear magnetic resonance(nMR),elemental analysis,and X-ray photoelectron spectroscopy(XPS),and employed in the pressure,solvent,and additive-free cO_(2)fixation to epoxides by its cycloaddition to epichlorohydrin,exhibiting a cooperative behavior between the MOF and the ionic liquid formed within the framework,achieving TOns of the confined tetrabutylammonium bromide(TBABr)up to 700.

关键词： metal-organic frameworks(MOFs) ionic liquids heterogeneous catalysis cO_(2)conversion