Extended light absorption and accelerated charge migration in ultrathin twisted carbon nitride nanoplates for efficient solar hydrogen production

Polymeric carbon nitride has been widely developed as a promising photocatalyst for solar hydrogen production via photocatalytic water splitting.However,pristine carbon nitride prepared by traditional solid-state polymerization usually encounters issues such as rapid carrier recombination and insufficient absorption of visible light below 460 nm.Herein,poly(heptazine imide)with a distinctive nanoplate structure was synthesized in a binary molten salt of NaCl–CaCl_(2).The salt template allows the formation of the thin nanoplate structure,which promotes the charge separation and migration.Besides,the intercalation of Ca^(2+)ions between the conjugated layers endows the activation of n–π*electron transition due to the distortion of in-plane heptazine layers.Accordingly,the optimized poly(heptazine imide)nanoplates achieve an apparent quantum efficiency of up to 17.3%at 500 nm for photocatalytic hydrogen production from water.This work shares new idea for rational control of the optical absorption and charge carrier dynamics of poly(heptazine imide).

How Multi-Sensory Perception Plays a Landscape Restorative Role in Adelaide's Urban Green Space

Urban green space is an effective psychological restoration landscape site.However,Adelaide's urban green space tends to focus on visual design but neglect non-visual senses.Sensory influence is interactive and has profound and subtle effects on tourists.The purpose of this study was to investigate the relationship between auditory,tactile,and psychological restoration ofxirban green space from a multi-sensory perspective.This study used quantitative research methods to investigate auditory and tactile-related landscape factors that have a positive effect on restoration.It is expected that this study will contribute to the high-quality restoration of urban green space and promote human health.

四内酰胺大环的分子识别与应用研究进展

分子识别在自然界中广泛存在,是许多生物过程以及超分子化学的核心.水的极性环境会显著削弱特定的非共价相互作用(如氢键),因此利用人工大环主体在水相中进行分子识别具有挑战性.四内酰胺大环是一类疏水空腔内部具有极性结合位点的人工大环主体,通过模仿生物受体的识别特性实现了水中亲水分子的识别,在疏水效应以及氢键的协同作用下可以实现药物分子、糖类、染料、有机污染物及疾病标志物等物质的选择性识别.总结了近三十年来四内酰胺大环在分子识别与应用方面的研究进展,尤其是在水相中的分子识别与应用研究,希望为今后四内酰胺大环的发展提供参考.

Mitochondrial fragmentation and ROS signaling in wound response and repair

Mitochondria are organelles that serve numerous critical cellular functions,including energy production,Ca2+home-ostasis,redox signaling,and metabolism.These functions are intimately linked to mitochondrial morphology,which is highly dynamic and capable of rapid and transient changes to alter cellular functions in response to environmental cues and cellular demands.Mitochondrial morphology and activity are critical for various physiological processes,including wound healing.In mammals,wound healing is a complex process that requires coordinated function of multiple cell types and progresses in partially overlapping but distinct stages:hemostasis and inflammation,cell pro-liferation and migration,and tissue remodeling.The repair process at the single-cell level forms the basis for wound healing and regeneration in tissues.Recent findings reveal that mitochondria fulfill the intensive energy demand for wound repair and aid wound closure by cytoskeleton remodeling via morphological changes and mitochondrial reactive oxygen species(mtROS)signaling.In this review,we will mainly elucidate how wounding induces changes in mitochondrial morphology and activity and how these changes,in turn,contribute to cellular wound response and repair.

A non-cooperative game-based distributed optimization method for chiller plant control

The heating,ventilation,and air-conditioning(HVAC)systems account for about half of the building energy consumption.The optimization methodology access to optimal control strategies of chiller plant has always been of great concern as it significantly contributes to the energy use of the whole HVAC system.Given that conventional centralized optimization methods relying on a central operator may suffer from dimensionality and a tremendous calculation burden,and show poorer flexibility when solving complex optimization issues,in this paper,a novel distributed optimization approach is presented for chiller plant control.In the proposed distributed control scheme,both trade-offs of coupled subsystems and optimal allocation among devices of the same subsystem are considered by developing a double-layer optimization structure.Non-cooperative game is used to mathematically formulate the interaction between controlled components as well as to divide the initial system-scale nonlinear optimization problem into local-scale ones.To solve these tasks,strategy updating mechanisms(PSO and IPM)are utilized.In this way,the approximate global optimal controlled variables of devices in the chiller plant can be obtained in a distributed and local-knowledge-enabled way without neither global information nor the central workstation.Furthermore,the existence and effectiveness of the proposed distributed scheme were verified by simulation case studies.Simulation results indicate that,by using the proposed distributed optimization scheme,a significant energy saving on a typical summer day can be obtained(1809.47 kW·h).The deviation from the central optimal solution is 3.83%.

β-distribution for Reynolds stress and turbulent heat flux in relaxation turbulent boundary layer of compression ramp

A challenge in the study of turbulent boundary layers(TBLs) is to understand the non-equilibrium relaxation process after separation and reattachment due to shock-wave/boundary-layer interaction. The classical boundary layer theory cannot deal with the strong adverse pressure gradient, and hence, the computational modeling of this process remains inaccurate. Here, we report the direct numerical simulation results of the relaxation TBL behind a compression ramp, which reveal the presence of intense large-scale eddies, with significantly enhanced Reynolds stress and turbulent heat flux. A crucial finding is that the wall-normal profiles of the excess Reynolds stress and turbulent heat flux obey a β-distribution, which is a product of two power laws with respect to the wall-normal distances from the wall and from the boundary layer edge. In addition, the streamwise decays of the excess Reynolds stress and turbulent heat flux also exhibit power laws with respect to the streamwise distance from the corner of the compression ramp. These results suggest that the relaxation TBL obeys the dilation symmetry, which is a specific form of self-organization in this complex non-equilibrium flow. The β-distribution yields important hints for the development of a turbulence model.