Importance of non-flow in mixed-harmonic multi-particle correlations in small collision systems

Recently CMS Collaboration measured mixed-harmonic four-particle azimuthal correlations, known as symmetric cumulants SC(n,m), in pp and pPb collisions, and interpreted the non-zero SC(n,m) as evidence for long-range collectivity in these small collision systems. Using the PYTHIA and HIJING models which do not have genuine long-range collectivity, we show that the CMS results, obtained with standard cumulant method, could be dominated by non-flow effects associated with jet and dijets, especially in $pp$ collisions. We show that the non-flow effects are largely suppressed using the recently proposed subevent cumulant methods by requiring azimuthal correlation between two or more pseudorapidity ranges. We argue that the reanalysis of SC(n,m) using the subevent method in experiments is necessary before they can used to provide further evidences for a long-range multi-particle collectivity and constraints on theoretical models in small collision systems.Comment: 7 pages and 6 figures, replace with published versio

Global well-posedness for the generalized 2D Ginzburg–Landau equation

AbstractThe local well-posedness for the generalized two-dimensional (2D) Ginzburg–Landau equation is obtained for initial data in Hs(R2) (s>1/2). The global result is also obtained in Hs(R2) (s>1/2) under some conditions. The results on local and global well-posedness are sharp except the endpoint s=1/2. We mainly use the Tao's [k;Z]-multiplier method to obtain the trilinear and multilinear estimates

Metal–organic framework growth at functional interfaces: thin films and composites for diverse applications

Porous metal–organic frameworks (MOFs) are highly ordered crystalline materials prepared by the self-assembly of metal ions with organic linkers to yield low density network structures of diverse topology. MOFs have attracted considerable attention over the last decade due to their facile preparation, tunable pore metrics and the ease of functionalisation of their internal surfaces, such that designer frameworks with exceptional properties for application in gas-storage, separation of small molecules, heterogeneous catalysis and drug delivery are becoming commonplace. For any material to find practical utility however, there is a need for processing and formulation into application-specific configurations. One way to do this is to prepare composite materials where the MOF is supported on a planar substrate or some other shaped body through interaction with functional groups at the support interface. This is a rapidly developing research area, and this review provides an overview of the diverse MOF composite materials prepared up to now, organised by interface type. The importance of the interface is explored within each section and while the overall emphasis is on applications of the composites, coatings and MOF-based devices, the most widely-used and successful synthetic strategies for composite formation are also presented

Research progress of the diagnosis and treatment for retinal vein occlusion

Retinal vein occlusion( RVO)is a common vascular disease of the retina and is one of the main reasons for blindness. In recent years,there have been some new understanding about the diagnosis and treatment of the disease,especially some new researches about treatment,for example,in the therapy of the intravitreal injection of triamcinolone acetonide and anti-VEGFs as well as dexamethasone implant(Ozurdex).This article will make a brief summarization of the progress about the diagnosis and treatment of RVO

Enablers and Consequences of Interfirm Co-Production

As contemporary firms increase their reliance on information technology (IT) and are increasingly turning their attention to jointly creating value with their primary stakeholders, there is a growing need to understand what enablers promote from interfirm value co-creation from co-production in supply chains, how the co-production can be realized and what value can be created through the co-production. We integrate systems theory and the relational view perspectives to develop an explanatory model to explain how co-production mediates the impacts of enablers on the reciprocal benefits created in the global supply chain context. Drawing upon systems theory, we identify three constructs: platform compatibility (i.e., compatibility), co-production (i.e., synergy), and collaborative governance (i.e., integration effort). We draw on the relational view to identify two activities: process alignment and resource sharing for co-production, conceptualize three basic types of reciprocal benefits: market, innovation and anshin value, and theorize co-production—the synergy of process alignment and resource sharing activities—as key to the realization of synergy, thereby contributing to the reciprocal benefits in the context of interfirm supply chain. Based on survey data collected from 464 senior management representatives from 230 high-tech manufacturing firms from within Taiwan and China, we found 1) collaborative governance has a positive effect on platform compatibility, 2) both collaborative governance and platform compatibility promote co-production, 3) guanxi has a positive effect on collaborative governance and has a positive moderating effect on collaborative governance and co-production, and 4) co-production positively affects reciprocal benefits. Our findings highlight 1) the important role of co-production in mediating the platform compatibility and collaborative governance effects on reciprocal benefits, and 2) the complementary role of guanxi in strengthening the collaborative governance effect on co-production. These results provide insights into how firms can co-create value through enhanced interfirm co-production