Institutional investor company social responsibility report and company performance

In the Chinese stock market, the rate of institutional holder and the company social responsibility report level are comparatively lower than those in the Western market. Historical research studies showed that there exist some connections between these two factors and company performance. This article uses the method of empirical analysis based on data during 3 years to try to find out the result

Facile fabrication of hydrolysis resistant phosphite antioxidants for high-performance optical PET films via in situ incorporation

Phosphite antioxidants are extensively used in polyester industry due to extraordinary antioxidative and chromaticity protection capabilities. Unfortunately, they are highly susceptible to hydrolysis leading to reduced antioxidative activity, which remains unsatisfactorily addressed so far. In this work, we have demonstrated the fabrication of hydrolysis resistant hybridized phosphite antioxidants (PSLDH) by physically melt-blending with layered double hydroxides (LDH) based on the hydrolysis mechanism. X-ray diffraction measurements indicate that basically phosphite antioxidants are physically hybridized with the LDH. Accelerated hydrolysis results show that as-fabricated hybridized phosphite antioxidants show much superior anti-hydrolysis capability to the unmodified counterpart because the basic LDH can neutralize the phosphoric acid created during hydrolysis, thus effectively prohibiting the self-catalytic effect. High performance optical poly(ethylene terephthalate) (PET) materials are then synthesized by in situ adding PSLDH in the polycondensation process. Only adding 0.05 wt% of the PSLDH containing 10 wt% of LDH can remarkably improve the anti-oxidative and chromaticity performances of the resultant PET. This work provides an innovative methodology for developing high-performance value-added chemical additives via facile physical hybridization

Hydrolysis of cellobiose catalyzed by zeolites-the role of acidity and micropore structure

The roles of acidity and micropore structure of zeolite were studied in the hydrolysis of the model oligosaccharide of cellulose-cellobiose. HZSM-5, HY, HMOR and H beta zeolites were selected as model catalysts for the hydrolysis of cellobiose. The effect of acidity of zeolite, including the strength, type and location, on its catalytic activity was investigated. The strong Bronsted acid sites located in micropores are the active sites for the hydrolysis of cellobiose to glucose. Meanwhile, the catalytic performance of zeolite is also dependent on the micropore size of zeolite. (C) 2015 Science Press and Dalian Institute of Chemical Physics. All rights reserved

Light-Driven Self-Cascade Peroxidase-like Nanozymes without Exogenous H₂O₂

The peroxidase (POD)-like nanozyme typically requires the addition of exogenous H2O2. To address the limitation, previous work mainly adopted a cascade strategy for H2O2 production. Herein, we propose a new light-driven self-cascade strategy to construct POD-like nanozymes without exogenous H2O2. The model nanozyme resorcinol–formaldehyde resin-Fe3+ (RF-Fe3+) is synthesized with the hydroxyl-rich photocatalytic material RF as the carrier to in situ chelate metal oxides, which can simultaneously achieve the functions of in situ H2O2 generation under irradiation and substrate oxidation via POD-like behavior. Notably, RF-Fe3+ exhibits high affinity to H2O2, attributed to the excellent adsorption ability and hydroxyl-rich feature of RF. Furthermore, the dual photoelectrode-assisted photofuel cell was further constructed with a high-power density of 120 ± 5 μW cm–2 based on the RF-Fe3+ photocathode. This work not only demonstrates the new self-cascade strategy of in situ generation of catalysis substrates but also provides an opportunity to extend the catalytical field

Growth and Physical Properties of SrxCa1−xCrO3 Single Crystals

Perovskites SrxCa1−xCrO3 attract much attention due to the controversy on the anomalous electronic state. In this study, we synthesized a series of SrxCa1−xCrO3 (0 ≤ x ≤ 1) single crystals under high pressure and high temperature conditions with self-oxidization. The crystal structure was determined using X-ray diffraction (XRD). With the increase of x, the structure transformed from orthorhombic to tetragonal to cubic. Antiferromagnetism was observed except for SrCrO3, and the TN decreased with increased x. All samples demonstrated semiconductive behavior by electrical resistivity measurement

Terahertz emission from vertically aligned multi-wall carbon nanotubes and their composites by optical excitation

International audienc

Temporal and spatial variability of dynamic microstate brain network in early Parkinson’s disease

Abstract Changes of brain network dynamics reveal variations in macroscopic neural activity patterns in behavioral and cognitive aspects. Quantification and application of changed dynamics in brain functional connectivity networks may contribute to a better understanding of brain diseases, and ultimately provide better prognostic indicators or auxiliary diagnostic tools. At present, most studies are focused on the properties of brain functional connectivity network constructed by sliding window method. However, few studies have explored evidence-based brain network construction algorithms that reflect disease specificity. In this work, we first proposed a novel approach to characterize the spatiotemporal variability of dynamic functional connectivity networks based on electroencephalography (EEG) microstate, and then developed a classification framework for integrating spatiotemporal variability of brain networks to improve early Parkinson’s disease (PD) diagnostic performance. The experimental results indicated that compared with the brain network construction method based on conventional sliding window, the proposed method significantly improved the performance of early PD recognition, demonstrating that the dynamic spatiotemporal variability of microstate-based brain networks can reflect the pathological changes in the early PD brain. Furthermore, we observed that the spatiotemporal variability of early PD brain network has a specific distribution pattern in brain regions, which can be quantified as the degree of motor and cognitive impairment, respectively. Our work offers innovative methodological support for future research on brain network, and provides deeper insights into the spatiotemporal interaction patterns of brain activity and their variabilities in early PD

Plenty of room on the top: pathways and spectroscopic signatures of singlet fission from upper singlet states

We investigate dynamic signatures of the singlet fission (SF) process triggered by the excitation of a molecular system to an upper singlet state SN (N > 1) and develop a computational methodology for the simulation of nonlinear spectroscopic signals revealing the SN → TT1 SF in real time. We demonstrate that SF can proceed directly from the upper state SN, bypassing the lowest excited state, S1. We determine the main SN → TT1 reaction pathways and show by computer simulation and spectroscopic measurements that the SN-initiated SF can be faster and more efficient than the traditionally studied S1 → TT1 SF. We claim that the SN → TT1 SF offers novel promising opportunities for engineering SF systems and enhancing SF yields.Ministry of Education (MOE)Submitted/Accepted versionL.C. was supported by the Key Research Project of Zhejiang Lab (2021PE0AC02). L.M. was supported by the National Natural Science Foundation of China (Grant 11874125). Y.Z. gratefully acknowledges the support of the Singapore Ministry of Education Academic Research Fund (Grants RG190/18 and RG87/20). G.G.G.’s research was funded by a DUT startup grant and by the National Natural Science Foundation of China (Grant 22088102). W.N. and M.F.G. acknowledge support of Hangzhou Dianzi University through startup fundin

Engineered inhalable nanocatalytic therapeutics for Parkinson's disease by inducing mitochondrial autophagy

Reactive oxygen species (ROS) - induced oxidative stress damage of dopaminergic neurons is the principal etiology of Parkinson's disease (PD). While most nanoenzymes can catalyze the breakdown of ROS present in the brain, they cannot eradicate the source of ROS production attributed to damaged mitochondria. Herein, we introduce a Co-doped Prussian blue (PB/Co) nanozyme that demonstrates multi-enzyme-like coordinated activity for scavenging present ROS and triggers mitophagy to remove damaged mitochondria. To further augment the brain entry efficiency of PB/Co nanozyme, we encapsulated it in 1,2-dioleoyl-3-trimethylammonium-propane (DOTAP) and 2,3-bis (palmitoyloxy)propyl-2-(trimethylammonio)ethylphosphate (DPPC) cationic liposomes and developed a non-invasive inhalable nanospray ((PB/Co)@DD) that permeates the brain via the olfactory bulb. In the PD mice model, (PB/Co)@DD nanospray induced mitophagy in the striatum to eliminate the ROS production source, preventing excessive ROS-induced sustained damage to dopaminergic neurons and averting the buildup of α-synuclein deposits, thereby ultimately restoring motor function in PD mice. Our research lays the foundation for catalytic therapy to eliminate abnormal mitochondria via the induction of mitophagy in PD mice models and highlights the potential of inhalable nanoenzymes as a non-invasive therapeutic strategy for the treatment of neuroinflammatory diseases