A high-performance bio-tissue imaging method using air flow-assisted desorption electrospray ionization coupled with a high-resolution mass spectrometer

An air flow-assisted desorption electrospray ionization (AFADESI) MSI device was combined with a highresolution mass spectrometer to optimize the system parameters and achieve more accurate spatial distribution characteristics for compounds of interest while investigating bio-tissue sections. Finally, the parameter conditions that can provide optimal ionic intensity and enhanced resolution were confirmed.     

Reversible Wide‐Range Tuneable Luminescence of a Dual‐Stimuli‐ Responsive Silver Cluster‐Assembled Material

Silver cluster‐assembled materials (SCAMs) are emerging multi‐functional materials and have attracted great attention recently. In this work, we have prepared a new SCAM of {[Ag₁₈(S^tBu)₁₀(CF₃COO)₂(PhPO₃)(PhPO₃H)₄(bpy‐NH₂)₂]?(PhPO₃H₂)}_n (denoted as Ag₁₈bpy‐NH₂), by a facile one‐pot method. Ag₁₈bpy‐NH₂ adopts a chain‐like structure made of Ag₁₈ clusters bridged by bipyridyl linkers. Ag₁₈bpy‐NH₂ exhibits reversible luminescent mechanochromism upon mechanical stimulation and solvent treatment. Moreover, it also displays luminescent thermochromism with a linear relationship of the temperature to the intensity ratio of the dual emissions over a wide temperature range of 83 to 303 K. This work might provide new insights into the assembly of multifunctional stimuli‐responsive SCAMs.     

High-accuracy finite-difference beam-propagation method for cylindrical geometry

A high-accuracy finite-difference beam-propagation method (HAFD-BPM) based on high-accuracy divided-difference formulas is presented. The truncation error in this HAFD-BPM is reduced to o(Δr)⁴in the transverse direction, whereas the error in a conventional FD-BPM is typically o(Δr)². Gaussian beam propagation in vacuum and nonlinear medium is simulated by this new method and conventional one. The comparison between them in computing time and accuracy reveals the advantage of this new method. As an example, this method is applied to the simulation of blow-up in self-focusing of a Gaussian beam. PACS 42.65.Hw; 42.25.Bs; 02.70.Bf     

高分子试剂的特性及其在分析化学中的应用

本文论述了可溶性高分子反应体系的特性,以及高分子分析试剂在分析化学中的应用前景。     

MoO_3和α－Sb_2O_4相间氧溢流行为的研究

通过脉冲还原技术和量子化学ＤＶ－Ｘα方法研究了ＭｏＯ３和α－Ｓｂ２Ｏ４相间氧溢流行为，揭示了有关氧溢流的动力、溢流氧的本质及可能的溢流途径的信息、结果表明，氧溢流是ａ－Ｓｂ２Ｏ４自发氧化ＭｏＯ３的结果，不依赖于气相氧的存在；溢流氧是亲核性的，但依赖于亲电性晶格氧的存在；溢流氧主要被ＭｏＯ３的（０１０）面所接收．对用ＤＶ－Ｘα法进行固体氧化物电子性质研究的可行性也进行了探讨．     

Nowhere-Zero 4-Flows,Simultaneous Edge-Colorings,And Critical Partial Latin Squares

It is proved in this paper that every bipartite graphic sequence with the minimum degree 2 has a realization that admits a nowhere-zero 4-flow. This result implies a conjecture originally proposed by Keedwell (1993) and reproposed by Cameron (1999) about simultaneous edge-colorings and critical partial Latin squares.* Partially supported by RGC grant HKU7054/03P. Partially supported by the National Security Agency under Grants MDA904-00-1-00614 and MDA904-01-1-0022.     

Preface

Preface

Preface     

Explicit dissipative schemes for boundary problems of generalized Schrödinger systems

In this paper, the author constructs a class of explicit schemes, spanning two time levels, for the initial-boundary-value problems of generalized nonlinear Schrödinger systems, and proves the convergence of these schemes with a series of prior estimates. For a single Schrödinger equation, the schemes are identical with those of the article [1].     

A note on functions whose local minima are global

In this note, a simple proof of a theorem concerning functions whose local minima are global is presented and some closedness properties of this class of functions are discussed.The authors would like to thank Dr. Tatsuro Ichiishi of CORE for outlining the new proof of Theorem 2.1.This research was done while the author was a research fellow at the Center for Operations Research and Econometrics, University of Louvain, Heverlee, Belgium.