摘要：
The anisotropic behavior of as-extruded 7003 aluminum alloy under quasi-static compression and high-speed impact was studied using samples with axes parallel to extrusion direction (ED) (0 degrees sample), at an angle of 45 degrees to ED (45 degrees sample), and perpendicular to ED (90 degrees sample). The experimental results show that the yield stress of the 0 degrees sample is the highest, while the 45 degrees sample is the lowest. Compared with other samples, the 90 degrees sample is more sensitive to the applied strain rate, which experiences a rapid failure after reaching peak stress under high-speed impact. Under quasi-static compression and high-speed impact, the 0 degrees sample exhibits nearly uniform deformation, while the 45 degrees and 90 degrees samples exhibit anisotropy behavior. Due to the occurrence of adiabatic shear, the plastic deformation anisotropy in 45 degrees and 90 degrees samples under high-speed impact is more significant compared to quasi-static compression. For the 45 degrees and 90 degrees samples, the r values, which characterize plastic deformation anisotropy, decrease from 0.77 to 0.82 under quasi-static compression to 0.46 and 0.40 under high-speed impact. In addition, adiabatic shear bands are observed in all deformed samples under highspeed impact, while only the 90 degrees sample fractures. Due to the significant difference in Schmidt factors along ED and transverse direction (TD), plastic deformation of the 90 degrees sample under high-speed impact is mainly concentrated in TD, while the deformation in ED is very small. The extremely uneven deformation leads to earlier nucleation and faster development of ASBs in TD, causing the 90 degrees sample to fracture under high-speed impact.
摘要：
Exposure to organic ultraviolet (UV) filters has raised concerns due to their potential adverse effects on environments. However, their toxic mechanisms on plants remain elusive. In this study, using integrative physiological and transcriptomic approaches we investigated the physiological and molecular responses to three representative UV filters, namely oxybenzone (OBZ), avobenzone (AVB), and octinoxate (OMC), in an agricultural model plant tobacco. The exposure to UV filters disrupts the functionality of photosystem reaction centers and the light-harvesting apparatus. Concurrently, UV filters exert a suppressive effect on the expression of genes encoding Rubisco and Calvin-Benson cycle enzymes, resulting in a decreased efficiency of the Calvin-Benson cycle and consequently hampering the process of photosynthesis. Exposure to UV filters leads to significant generation of reactive oxygen species within tobacco leaves and downregulation of oxidoreductase activities. Moreover, UV filters promote abscisic acid (ABA) accumulation by inducing the expression of ABA biosynthesis genes whereas repress indole-3-acetic acid (IAA) biosynthesis gene expression, which induce leaf yellowing and slow plant growth. In summary, the organic UV filters exert toxic effects on tobacco growth by inhibiting chlorophyll synthesis, photosynthesis, and the Calvin-Benson cycle, while generating excessive reactive oxygen species. This study sheds light on the toxic and tolerance mechanisms of UV filters in agricultural crops.
摘要：
Wildfires and post-fire management exert profound effects on soil properties and microbial communities in forest ecosystems. Understanding microbial community recovery from fire and what the best post-fire management should be is very important but needs to be sufficiently studied. In light of these gaps in our understanding, this study aimed to assess the short-term effects of wildfire and post-fire management on both bacteria and fungi community composition, diversity, structure, and co-occurrence networks, and to identify the principal determinants of soil processes influencing the restoration of these communities. Specifically, we investigated soil bacterial and fungal community composition, diversity, structure, and co-occurrence networks in lower subtropical forests during a short-term (<3 years) post-fire recovery period at four main sites in Guangdong Province, southern China. Our results revealed significant effects of wildfires on fungal community composition, diversity, and co-occurrence patterns. Network analysis indicated reduced bacterial network complexity and connectivity post-fire, while the same features were enhanced in fungal networks. However, post-fire management effects on microbial communities were negligible. Bacterial diversity correlated positively with soil microbial biomass nitrogen, soil organic carbon, and soil total nitrogen. Conversely, based on the best random forest model, fungal community dynamics were negatively linked to nitrate-nitrogen and soil water content. Spearman's correlation analysis suggested positive associations between bacterial networks and soil factors, whereas fungal networks exhibited predominantly negative associations. This study elucidates the pivotal role of post-fire management in shaping ecological outcomes. Additionally, it accentuates the discernible distinctions between bacterial and fungal responses to fire throughout a short-term recovery period. These findings contribute novel insights that bear significance in evaluating the efficacy of environmental management strategies.
作者机构：
[Peiwang Li; Changzhu Li; Jingzhen Chen] State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha 410004, China;Authors to whom correspondence should be addressed.;[Ding Kuang] Hunan Haitai Bonong Biotechnology Co., Ltd., Yueyang 414000, China;These authors contributed equally to this work.;[Wenbin Zeng; Shuixuan Zhu; Lijuan Jiang] College of Life Science and Technology, Central South University of Forestry and Technology, Changsha 410004, China
通讯机构：
[Qiang Liu] A;[Yan Yang] S;State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha 410004, China<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>Hunan Haitai Bonong Biotechnology Co., Ltd., Yueyang 414000, China<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>College of Life Science and Technology, Central South University of Forestry and Technology, Changsha 410004, China
摘要：
The optimization of explant selection and adjustment of plant growth regulators (PGRs) ratio may enhance the efficiency of micro-propagation of Gardenia jasminoides Ellis. The findings of the study suggest that the shoot tip proved to be the optimal explant for regenerating adventitious buds, with an impressive regeneration rate of 77.78% and the average number of adventitious buds being 2.86. The ideal medium consisted of Murashige and Skoog (MS) medium supplemented with 6-benzylaminopurine (6-BA) at a 2 mg L−1, indoleacetic acid (IAA) at a 0.2 mg L−1, kinetin (KT) at 0.15 mg L−1, resulting in an outstanding regeneration rate of adventitious buds reaching up to 91.11%. For rooting purposes, the best medium was found be half-strength MS supplemented with indoleacetic acid (IAA) 0.5 mg L−1, achieving an rate for adventitious roots amounting to as high as 97.78%. The culture plantlets ultimately thrived, achieving an impressive transplanting survival rate of 93.33%. The application of PGRs was also found to enhance the regeneration of adventitious buds by increasing the ratios of endogenous hormones ZR/IAA and GA3/IAA. Additionally, it facilitated the differentiation of adventitious roots by elevating the ratios of endogenous hormones IAA/ZR, IAA/GA3, and ABA/GA3. Our study would provide a theoretical reference for the establishment of an efficient gardenia tissue culture system and the industrial production of gardenia.
作者机构：
[Lili Pan; Weizhi Shao; Siyu Xiong; Qianhui Lei] College of Computer Science and Information Technology, Central South University of Forestry and Technology, Changsha 410114, China;[Shiqi Huang; Eric Beckman] Chaplin School of Hospitality and Tourism Management, Florida International University, North Miami 33181, USA;[Qinghua Hu] School of Artificial Intelligence, Tianjin University, Tianjin 300072, China
通讯机构：
[Weizhi Shao] C;College of Computer Science and Information Technology, Central South University of Forestry and Technology, Changsha 410114, China
摘要：
Recently, emotion recognition from facial expressions has achieved unprecedented accuracy with the development of deep learning. Despite this progress, most existing emotion recognition methods are supervised and thus require extensive annotation. This issue is particularly pronounced in continuous domain datasets where annotation costs are very high. Furthermore, discrete domain datasets containing specific poses are too uniform to reflect complex and actual emotions. Existing methods that employ classification loss pay little attention to image similarity, making it difficult to distinguish similar emotions. To improve the learning ability for image similarity and reduce the annotation cost of continuous domain datasets, this research proposes a Semi-Supervised Emotion Recognition (SSER) method, which incorporates Activation-matrix Triplet loss (AMT loss) and pseudo label with Complementary Information (CI label). Specifically, the AMT loss is constructed by encoding multiple activation channels of an image as a matrix, which are utilized to capture the image similarity. The CI label firstly adopts the coupling effect of the complementary information from images and the multi-stage model for SSL to obtain high-confidence pseudo-labels. Then, entropy minimization and consistency regularization are used to improve the accuracy of pseudo labels. The SSER is evaluated on continuous domain datasets (AFEW-VA and AFF-Wild) and discrete domain datasets (FER2013 and CK+). The experimental results demonstrate that the SSER combined with AMT loss and CI label makes improvement for emotion recognition on continuous domain datasets, meanwhile the SSER is also desirable and effective for emotion recognition on discrete domain datasets.
摘要：
The "Annual Report 2021" from the United Nations Environment Programme (UNEP) highlights that the transportation sector is the fastest-growing greenhouse gas emissions sector, accounting for approximately 25% of energy-related emissions. What is even more concerning is that, at a time when carbon emissions need to be urgently reduced across various industries globally, carbon emissions from the transportation sector continue to rise. This is because the improvement in the efficiency of vehicle power combustion struggles to offset the increasing emissions resulting from the massive volume of travel. With the enhancement of transportation networks in various countries, it is projected that the growth rate of carbon emissions in the transportation sector will surpass that of the industrial and power sectors, presenting a significant challenge to achieving the emission reduction goals outlined in the Paris Agreement. Carbon emissions in the global transportation sector encompass various modes of transportation, including road, rail, aviation, and maritime, with road transportation being the largest contributor to carbon emissions. This study utilized the Stacking technique to build the X-MARL model for predicting
$$\hbox {CO}_{2}$$
emissions from vehicles and formulated recommendations for carbon reduction in the transportation industry. The model was tested using a dataset of vehicle
$$\hbox {CO}_{2}$$
emissions officially recorded by the Canadian government, comprising 7385 data points and covering 12 different vehicle parameter attributes. During the experimentation process, three statistical evaluation metrics were employed, namely mean squared error (MSE), root-mean-squared error (RMSE), and the coefficient of determination (R2). The dataset was randomly split into a training set (80% of the total data) and a testing set (20% of the total data). The experimental results demonstrated that the X-MARL model exhibited the highest prediction accuracy. This study provides an original strategy for accurately predicting carbon emissions from road transportation, which can offer support and guidance to decision-makers in formulating and implementing effective environmental policies.
期刊：
Journal of Hazardous Materials,2024年466:133653 ISSN：0304-3894
作者机构：
[Luo, Kun; Xie, Can; Yuan, Xiaomin; Liu, Ting] Central South University of Forestry and Technology, Changsha, Hunan 410004, China;[Zhou, Liyi] Central South University of Forestry and Technology, Changsha, Hunan 410004, China. Electronic address: zhouly0817@163.com
摘要：
Cadmium-contaminated water and food are seriously hazardous to the human health, especially liver injury. To understand the entanglement relationship between cadmium ion (Cd(2+))-induced liver injury and the biomarker sulfur dioxide (SO(2)), a reliable bioanalytical tool is urgently needed, detecting SO(2) to diagnose and evaluate the extent of liver injury in vivo. Herein, based on the Förster resonance energy transfer (FRET) mechanism, a novel SO(2)-tunable NIR ratiometric fluorescent probe (SMP) was developed, it was used to diagnose and treat liver injury induced by Cd(2+) in biosystems. Specifically, it was constructed by conjugating a NIR dicyanoisophorone with a NIR benzopyranate as the donor and acceptor, respectively, and the ratiometric response of SO(2)- regulated by the Michael addition reaction. In addition, SMP exhibits rapid reaction time (<15s), two well-resolved emission peaks (68nm) with less cross-talk between channels for high imaging resolution, superior selectivity, and low limit of detection (LOD=80.3nM) for SO(2) detection. Impressively, SMP has been successfully used for intracellular ratiometric imaging of Cd(2+)-induced SO(2) and diagnostic and therapeutic evaluation in liver injury mice models with satisfactory results. Therefore, SMP may provide a powerful molecular tool for revealing the occurrence and development relationship between SO(2) and Cd(2+)-induced liver injury. ENVIRONMENTAL IMPLICATION: Cadmium ions are one of the well-known toxic environmental pollutants, which are enriched in the human body through inhalation of cadmium-contaminated air or from the food chain, leading to damage in various organs, especially liver injury. Therefore, we developed a novel fluorescent probe that can specifically detect SO(2) in Cd(2+)-induced liver injury, which is critically important for the diagnosis and evaluation of Cd(2+)-induced liver injury diseases. The specific detection of SO(2) of this probe has been successfully demonstrated in live HepG2 cells and Cd(2+)-induced liver injury mice.
通讯机构：
[Sun, DL ] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
摘要：
Bamboo is an environmentally friendly building structural material. This work investigated the cavity structural characteristics and physical and mechanical properties of honeycomb sandwiches and natural bamboo in the longitudinal direction. The effective elastic parameters of periodically arranged hexagonal bamboo honeycomb cells under in-plane and out-of-plane loads were modeled using analytical and numerical approaches. Then, the effective elastic parameter model of bamboo honeycomb cells was validated by experiments and finite element analysis. The average errors between the calculated and experimental equivalent modulus of elasticity, Poisson's ratio, and shear modulus in the three principal axis directions were 7.43, 4.37, and 8.68%, respectively. The average relativities between the model values of the elastic parameters of the bamboo honeycomb cell and the simulation results in the three directions were 5.46, 5.40, and 6.12%, respectively. The experimental and finite element analysis showed that the constructed effective elastic parameter model of the bamboo honeycomb cell better reflected the state of the bamboo core when subjected to force. This study provides insights for further research on the mechanical properties of bamboo materials and their application in bamboo-based lightweight and high-strength sandwich structures.
通讯机构：
[Qiu, RH ; Xiong, BQ ; Chen, Y ] H;Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Peoples R China.;Hunan Univ Chinese Med, Sch Med, Dept Physiol, Changsha 410208, Peoples R China.;Hunan Inst Sci & Technol, Dept Chem & Chem Engn, Yueyang 414006, Peoples R China.
摘要：
In this study, we present a nickel-catalyzed reductive C(sp3)–Sb coupling of unactivated alkyl chlorides with chlorostibines. This approach is highly versatile, tolerating various functional groups such as acetal, alkene, nitrile, amine, ester, silyl ether, thioether, and various heterocyclic compounds. Notably, the late-stage modification of bioactive molecules and the satisfactory anticancer activity against cancerous MDA-MB-231 also demonstrate the potential application.
期刊：
Computer-Aided Civil and Infrastructure Engineering,2024年39(4):617-634 ISSN：1093-9687
通讯作者：
Zhou, GX
作者机构：
[Yang, Yixin; Sun, Lixiang; Zhou, Guoxiong; Chen, Aibin; Zhang, Yukai] Cent South Univ Forestry & Technol, Coll Comp & Informat Engn, Changsha 410004, Peoples R China.;[Cai, Weiwei] Jiangnan Univ, Coll Artificial Intelligence & Comp Sci, Wuxi, Peoples R China.;[Li, Liujun] Univ Idaho, Dept Soil & Water Syst, Moscow, ID USA.
通讯机构：
[Zhou, GX ] C;Cent South Univ Forestry & Technol, Coll Comp & Informat Engn, Changsha 410004, Peoples R China.
摘要：
Abstract The segmentation accuracy of bridge crack images is influenced by high‐frequency light, complex scenes, and tiny cracks. Therefore, an integration–competition network (complex crack segmentation network [CCSNet]) is proposed to address these problems. First, a grayscale‐oriented adjustment algorithm is proposed to solve the high‐frequency light problem. Second, an integration–competition mechanism is proposed to detach complex backgrounds and grayscale features of cracks. Finally, a tiny attention mechanism is proposed to extract the shallow features of tiny cracks. CCSNet outperforms seven state‐of‐the‐art crack segmentation methods in both generalization and comparison experiments on self‐built dataset and four public datasets. It also achieved excellent performance in practical bridge crack tests. Therefore, CCSNet is an effective auxiliary method for lowering the cost of bridge safety detection.
作者机构：
[Liu, Falin; Liu, FL; Chen, Hao] Cent South Univ Forestry & Technol, Coll Forestry, Changsha, Peoples R China.
通讯机构：
[Liu, FL ] C;Cent South Univ Forestry & Technol, Coll Forestry, Changsha, Peoples R China.
关键词：
Fire disturbance;Ecosystem recovery;Subtropical climate;Prescribed burning
摘要：
Soil water repellency (SWR) is a physical phenomenon whereby the surface of soil particles cannot be, or resists being, moistened by water. The recovery process of fire-induced SWR can provide important evidence for ecosystem resilience, but most existing studies ignored this process. Prescribed burning is a widely used method to reduce the risk of fire and fuel. However, prescribed fires can increase SWR, reducing infiltration and increasing overland flow and subsequent soil erosion. In order to understand the ecosystem resilience process from fire-induced SWR, soil samples were collected before and after prescribed burning. Four different forest types in the Hunan province of China were studied. Soil samples at four different soil depths (0-5, 6-10, 11-15, and >15 cm) and four time intervals (3, 30, 180, and 360 d) after burning at different intensities were collected. No significant difference in SWR was found among the four forest types, but the SWR of soil in plantations was stronger than that in secondary forests before fire. Most soil samples showed slightly increased SWR after burning, SWR increasing with fire intensity. Surface soil (0-5 cm) SWR showed greater sensitivity to fire disturbance than subsurface soil (>5 cm). SWR had a smaller scope of influence and shorter recovery period in burned secondary forests. Although SWR recovered over time, recovery was slower with increasing fire intensity. SWR always recovered to pre-fire levels given sufficient time. Our study revealed the recovery process of SWR, and explored the temporal and spatial mechanisms of forest ecosystem recovery after prescribed burning.
作者机构：
[Zhaoyang Yu; Yuan Liu; Shanshan Chang] College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;Hunan Taohuajiang Bamboo Science & Technology Co. Ltd., Yiyang 413400, China;Astrum Innovations Limited, Wisdom Park, Country Garden, Changsha 410006, China;[Denis Rodrigue] Department of Chemical Engineering, Laval University, Quebec, G1V 0A6, Canada;[Xiaodong (Alice) Wang] Department of Wood and Forest Sciences, Laval University, Quebec, G1V 0A6, Canada
通讯机构：
[Jinbo Hu; Gonggang Liu; Shanshan Chang] C;College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>Astrum Innovations Limited, Wisdom Park, Country Garden, Changsha 410006, China<&wdkj&>College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>Hunan Taohuajiang Bamboo Science & Technology Co. Ltd., Yiyang 413400, China<&wdkj&>Astrum Innovations Limited, Wisdom Park, Country Garden, Changsha 410006, China
摘要：
Similar to transpiration, the formulation of interfacial solar evaporation has been designed to perform water treatment. The concept involves wood-based support (tree) with a graphene-based layer acting as leaves. To enhance light absorption and solar-thermal conversion capacity, a novel holly-leaf graphene (HLG) layer with an individual hollowed-out structure was engineered. The formation mechanism of this HLG was shown to be linked to the strong capillarity forces in the polyporous wood. By creating biomimetic leaves made of graphene, the light-to-heat conversion performance can be improved, while exhibiting substantially lower thermal conductivity (74 mW/m/K) than natural wood. Under solar irradiation, HLG/wood exhibits an outstanding evaporation rate of 1.96 kg/m2/h, with an impressive efficiency of 94%. A theoretical model of HLG/wood based on the thermal management capability was built to further confirm its structural superiority in facilitating photothermal conversion. Consequently, a bilayer evaporator based on HLG/wood has the potential to revolutionize water purification processes, including desalination of seawater, removal of heavy metal ions, and treatment of organic dye-contaminated wastewater.
