Research on the Impact of Online Charity Feedback Forms on User Response

This paper studies the impact of different online charity feedback forms on user response. Starting from the user behavior, this paper studies the process and mechanism of the influence of feedback forms including the current behavior and the superior goal of behavior on user\u27s subsequent behavior. The experimental results show that when feedback points to the current behavior, it will reduce the user\u27s consistent behavior and increase the inconsistent behaviors such as choosing the hedonics. When the online charity feedback points to the superior goal of the behavior, the user\u27s willingness to donate will be enhanced and more consistent behavior will be increased. This paper highlights the role of different feedback forms in corporate social responsibility and the importance to user behavior

Sinusoidally architected helicoidal composites inspired by the dactyl club of mantis shrimp

ABSTRACTThe impact region of the dactyl club of mantis shrimp features a rare sinusoidally helicoidal architecture, contributing to its efficient impact-resistant characteristics. This study aims to attain bioinspired sinusoidally architected composites from a practical engineering way. Morphological features of plain-woven fabric were characterized, which demonstrated that the interweaving warp and weft yarns exhibited a sinusoidal architecture. Interconnected woven composites were thus employed and helicoidally stacked to achieve the desired structure. Quasi-static three-point bending and low-velocity impact tests were subsequently performed to evaluate their mechanical performance. Under three-point bending condition, the dominant failure mode gradually changed from fiber breakage to delamination with the increase in the pitch angle. Failure displacement and energy absorption of the helicoidal woven composites were, respectively, 43.89% and 141.90% greater than the unidirectional ones. Under low-velocity impact condition, the damage area of the helicoidal woven composites decreased by 49.66% while the residual strength increased by 10.10% compared with those of the unidirectional ones, exhibiting better damage resistance and tolerance. Also, effects of fiber architecture on mechanical properties were examined. This work will shed light on future design of the next-generation impact-resistant architected composites

A magnetic nanocomposite combined with cinnamic acid for capture–inhibition–separation of Aspergillus fumigatus

Abstract To prevent the generation of drug‐resistant fungi from long‐term exposure to microorganisms, cinnamic acid (CA), a natural effective antifungal agent, was successfully coupled with poly‐dopamine magnetic nanoparticles (CA–DMPs). Due to the low solubility of CA, the saturated solution of CA (1.61 mg/mL, 45°C) had no antifungal effect. Contrarily, CA–DMPs showed a good antifungal effect. The resulting heat‐stable and reusable antifungal CA–DMP composite particles were superparamagnetic (49.79 emu g−1) and had an average diameter of 25.01 ± 1.36 nm. The novel composites showed good antifungal activity and excellent recycling performance, the sterilization rate of CA–DMPs remained above 96% after seven consecutive running cycles. CA–DMP composites could damage the fungal cell wall and membrane system, leading to the leakage of cell inclusions. Furthermore, transcriptome analysis of Aspergillus fumigatus treated with composites showed that 466 differentially expressed genes were primarily associated with cell wall membrane, membrane transporters, energy metabolism, genetic expression, and oxidation–reduction. The effect of CA–DMPs in inducing mitochondrial membrane dysfunction might result in the disruption of energy metabolism and REDOX homeostasis. Overall, the results reported herein provide new insight into the potential antifungal nanomaterials. In vitro antifungal experiments performed on cherry tomatoes confirm the application potential of the synthesized material in the field of fruit and vegetable preservation

A Co-Axial Microtubular Flow Battery Cell with Ultra-high Volumetric Power Density

Volumetric power density is a key factor determining flow batteries\u27 footprint, capital cost and ability to handle uneven energy resource distributions. While significant progress has been made on flow battery materials and electrochemistry to improve energy density, conventional flow battery assemblies based on planar cell configuration exhibit low packing efficiencies and membrane surface area per volume of the cell, thus resulting in low volumetric power density. Here, we introduce a co-axial microtubular (CAMT) flow battery cell that significantly improves the volumetric power density. This cell design overcomes the intrinsic power limit of planar cell configuration and is suitable for all mainstream flow battery chemistries. Using zinc-iodide chemistry as a demonstration, our CAMT cell shows peak charge and discharge power densities of 1322 W/Lcell and 306.1 W/Lcell compared to average charge and discharge power densities of 2,500 cycles at off-peak conditions. Furthermore, we have also demonstrated that the CAMT cell is compatible with zinc-bromide, quinone-bromide, and all-vanadium chemistries. The CAMT flow cell represents a device-level innovation to enhance the volumetric power of flow batteries, and potentially reduce the size and cost of the cells and the entire flow battery. The CAMT design can potentially be applied to other electrochemical systems and lead to a paradigm shift in flow battery fundamental study and commercialization

Ternary Exciplexes for Enhanced Two-Photon Excited Fluorescence by the Synergy Effect of Dual Reverse Intersystem Crossing Channels

A nonlinear optical (NLO) ternary exciplex is developed using a two-photon absorbing acceptor material tris(2,4,6-trimethyl-3-(pyridin-3-yl)phenyl)borane (3TPYMB), a two-photon absorbing donor material 4,4′-cyclohexylidenebis[N,N-bis(p-tolyl)aniline] (TAPC), and a linear optical acceptor material 2,4,6-tris(1,1′-biphenyl)-1,3,5-triazine (T2T). In the ternary mixture, the high-energy exciplex TAPC:3TPYMB and the low-energy exciplex TAPC:T2T generate an effective synergy effect on the basis of their reverse intersystem crossing (RISC) channels to achieve further utilization of triplet excitons, giving rise to significantly enhanced one- and two-photon excited fluorescence properties. The highest photoluminescence quantum yield (PLQY) of the ternary exciplex 3TPYMB:TAPC:T2T measured in air atmosphere is ∼77.8%, which is greatly improved compared to that of the binary exciplex TAPC:T2T (∼39.6%) and the binary exciplex TAPC:3TPYMB (∼3.7%). More interestingly, the ternary exciplex also exhibits enhanced two-photon excited fluorescence under long-wavelength laser excitation. In comparison, no improvement in PLQY is observed in another ternary exciplex 3TPYMB:4,4′,4″-tris(carbazole-9-yl)triphenylamine (TCTA):T2T, which lacks an effective synergy effect between its high- and low-energy exciplex RISC channels. Our synergistic dual-channel RISC strategy may be helpful for the design of multicomponent thermally activated delayed fluorescence (TADF) NLO materials and facilitate the development of NLO applications