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.
摘要：
Dew-point indirect evaporative cooling (DPIEC) technology is designed and applied as a low carbon-emission and high energy-efficient air conditioning (AC) solution without employing non-environmentally friendly refrigerant and mechanical compressor for cooling in building sector. A more realistic three-dimensional (3-D) model of the DPIEC that better captures the fundamental thermodynamic of its operation is proposed. It considers the variability of air thermal properties and is employed to investigate the DPIEC's performance for three possible arrangements. The 3-D model is classified as configurations 1, 2 and 3 based on the relative flow direction between primary/secondary air and spray water. Experimental results indicate that the model can well evaluate the thermodynamic performance. Additionally, the influence of crucial factors on the performance is parametrically studied by employing three performance indexes. Comparison reveals that configuration 1 can achieve the highest effectiveness and cooling capacity. Results also show that the secondary-to-primary air ratio should be confined to around 0.3 to achieve maximum cooling capacity, and the optimal channel gap should be limited to the range from 3 to 4 mm. Comparatively, the relative flow direction between the spray water and the primary/secondary air has a greater effect on the thermodynamic performance than the spray water inlet velocity.
摘要：
<bold>Background:</bold> Chlamydia is a Gram-negative obligate intracellular bacterium that is pathogenic for humans and a large variety of veterinary animal species. However, there is no continuous monitoring of chlamydia infection data in pigs in Hunan province, southern China. Therefore, in order to evaluate the seroprevalence and identify risk factors associated with Chlamydia infection in pigs within this region, a comprehensive study was conducted. <bold>Methods:</bold> A total of 3848 serum samples were collected from pigs (from farmers and companies) between May 2017 and August 2018. The presence of specific antibodies against Chlamydia was determined through the employment of the indirect hemagglutination assay (IHA). <bold>Results:</bold> The overall seroprevalence of Chlamydia was determined to be 26.90% (1038/3848, 95% confidence interval: 25.60-28.40). By employing statistical analysis using SPSS software (p < 0.05), factors such as altitude, sampling regions, and rearing systems of pigs were identified as potential risk factors for Chlamydia infection. <bold>Conclusion:</bold> These findings elucidate a substantial prevalence of Chlamydia in pigs within the mountainous region of Hunan province, southern China, thereby highlighting a potential risk to human health. These results underscore the need for proactive measures and targeted interventions to mitigate the transmission of Chlamydia in porcine populations, safeguarding both animal welfare and public health.
关键词：
the three-terminal ballistic junction;the alpha-T-3 lattie;the anisotropic transport
摘要：
The three-terminal ballistic junction (TBJ) has promising applications in nanoelectronics. We investigate the transport properties of aα-T(3)-based TBJ, where two typical configurations are considered, i.e. the A- and Z-TBJ. It is found that both A- and Z-TBJ exhibit transmission anisotropy, and the transmission of the A-TBJ has stronger anisotropy than that of the Z-TBJ. The amplitude of the rectification coefficient is smaller than that of phosphorene TBJ, but larger than that of graphene TBJ. When the symmetrical input is applied, the output voltage curve exhibits symmetric behavior. While in the case of asymmetric input, the symmetric behavior is broken, and the maximum value of the output voltage can reach a positive value. Interestingly, the voltage output shows a dramatic nonlinear response which may be useful for the voltage diode application with a push-pull input voltage. In addition, the heat fluxes of the asymmetric input are much smaller than those of the symmetric input. The maximum value of the heat flux under the symmetric input exceeds twice of that under the asymmetric input. Our results are useful to design nanoelectronic devices based onα-T(3)TBJ.
摘要：
Antimony pollution is well recognized to induce cancer and deformity. By polymerization technique, a carbon aerogel microsphere (Ce@SCA) modified by Ce and S with micron size, well-developed pore structure, and large specific surface area was created. Ce@SCA exhibited the advantages of efficient selectivity and high adsorption capacity for Sb(III) in water. The highest adsorption capacity derived using the Sips isothermal model was 345.18 mg.g(-1), and the Sb (III) adsorption process was thermodynamically estimated as spontaneous, exothermic, and entropy-decreasing chemisorption. Meanwhile, Ce@SCA can convert highly toxic Sb(III) into Sb (V), which is suitable for the remediation of antimony-contaminated water bodies. X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) were analyzed to elucidate the adsorption mechanism and to propose optimized adsorption configurations. A considerable number of -OH and -SH on the surface may increase the binding site of Sb, and the creation of S-Sb, O-Sb, and Ce-O-Sb covalent bonds was the key to Sb adsorption. This research provides a simple method for preparing cerium oxide-loaded and sulfur-doped carbon aerogel (Ce@SCA) with mild conditions and no hazardous waste, which also has superior adsorption properties for Sb (III) and high reusability.
期刊：
Expert Systems with Applications,2024年244:121150 ISSN：0957-4174
通讯作者：
Zhang, DZ
作者机构：
[Ji, Bin; Zhou, Saiqi; Zhang, Dezhi; Zhang, DZ] Cent South Univ, Sch Traff & Transportat Engn, Changsha 410075, Hunan, Peoples R China.;[Li, Shuangyan] Cent South Univ Forestry & Technol, Coll Logist & Transportat, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Zhang, DZ ] C;Cent South Univ, Sch Traff & Transportat Engn, Changsha 410075, Hunan, Peoples R China.
关键词：
Two-echelon vehicle routing problem;Direct deliveries;Access time windows;Integer linear programming model;Adaptive large neighborhood search
摘要：
Nowadays, heavy-duty trucks are usually restricted from entering urban areas due to emission and congestion problems in most cities. So, a two-echelon distribution system becomes vastly applicable, in which satellites transfer cargo and avoid heavy-duty trucks entering urban areas. However, with the development of new energy vehicles and access policies and regulations, some environmentally friendly trucks are accessible to urban areas within specific time windows of daytime directly. In light of this, we introduce a two-echelon vehicle routing problem with direct deliveries and access time windows (2E-VRPDDATW) arising in city logistics. In this problem, customers are served by the two-echelon distribution systems within their required time windows and are allowed to be directly delivered by the first echelon vehicles within access time windows, which provides more flexible routing schemes. A novel mixed integer linear programming (MILP) model for the above problem is presented, and the corresponding adaptive large neighborhood algorithm is developed. The computational experiments are provided to verify the validity of the proposed model and the effectiveness of the algorithm. Finally, the sensitivity analysis shows some interesting findings about the number of two-echelon vehicles and the assignment of customers. Moreover, we conclude that direct deliveries are advantageous in transportation costs when the proportion of the end time of access time window to the last end time of customers is greater than 0.25.
摘要：
The modulation mechanism of iron (Fe) and manganese (Mn) in transition-metal elements on the interface bonding and mechanical properties of bronze (Cu3Sn)-based/diamond composites is investigated through first-principles calculations. Transition-elements-doping scenarios are investigated employing six-layer slab models. It is revealed that the doping of Fe or Mn can make the Cu3Sn/diamond interface more stable, which effectively improves the wettability of the Cu3Sn/diamond interface based on the calculation results and analysis of interface energy, differential charge density model, and density of states. However, co-doping with both Fe and Mn weakens the wettability of the Cu3Sn/diamond interface. Finally, wettability tests and microstructure characterizations demonstrate that the doping of Fe and Mn represents an effective approach to controlling the interface bonding performance of bronze/diamond composites. Fe- and Mn-doping effects on the interface binding and mechanical properties of Cu3Sn/diamond composites are studied using first-principles calculations. Analysis of interface energy, charge density models, and density of states reveals that individual Fe or Mn doping improves Cu3Sn//diamond interface wettability. Conversely, co-doping weakens Cu3Sn/diamond interface wettability. Wettability tests and microscopic characterization validate these findings.image (c) 2023 WILEY-VCH GmbH
摘要：
Eucalyptus was one of the most cultivated hardwood species worldwide, with rapid growth, good wood properties and a wide range of adaptability. Eucalyptus stem undergoes primary growth (longitudinal growth) followed by secondary growth (radial growth), which produces biomass that is an important source of energy worldwide. In order to better understand the genetic regulation of secondary growth in Eucalyptus grandis, Transcriptome analyses in stem segments along a developmental gradient from the third internode to the eleventh internode of E. grandis that spanned primary to secondary growth were carried out. 5,149 genes that were differentially expressed during stem development were identified. Combining the trend analysis by the Mfuzz method and the module-trait correlation analysis by the Weighted Gene Co-expression Network Analysis method, a total of 70 differentially expressed genes (DEGs) selected from 868 DEGs with high connectivity were found to be closely correlated with secondary growth. Results revealed that the differential expression of these DEGs suggests that they may involve in the primary growth or secondary growth. AP1, YAB2 TFs and EXP genes are highly expressed in the IN3, whereas NAC, MYB TFs are likely to be important for secondary growth. These results will expand our understanding of the complex molecular and cellular events of secondary growth and provide a foundation for future studies on wood formation in Eucalyptus.
摘要：
Exploring the single relationship between the inversion degree of spinel and its catalytic performance is a great challenge, but has important significance for further structural design and application. A series of CoMn inverse spinels were prepared and the general formula (Co-1-x(2+) Co-x(3+)) (tet) (Mn-1(3+) Co-x(2+) Co-1-x(3+))(oct)O-4 was deduced through X-ray diffraction refinement to find a decreased inversion degree x as calcination temperature rose. Catalytic oxidation of toluene showed that higher inversion degree (S-300 with x approximate to 0.95) can reach larger conversion rate (90 % at about 250 degrees C for 400 ppm toluene) with greater reaction stability (140 h). Density Functional Theory (DFT) calculations on density of states indicated its metallic nature, and found that the strength of O-p and Transition metal-d orbitals at Fermi energy is positively correlated to the inversion degree, meaning stronger electron migration ability. Along with the adsorption calculation analysis that lattice oxygen species are proved to work dominantly (S-300 with lowest adsorption energy but highest performance), this work uncovered a theoretical insight into inverse spinel oxide, to provide the possibility of elevated oxidation ability through structural control.
期刊：
IEEE Transactions on Intelligent Transportation Systems,2024年 ISSN：1524-9050
通讯作者：
Ji, B
作者机构：
[Ji, Bin; Ji, B; Zhou, Saiqi; Zhang, Dezhi] Cent South Univ, Sch Traff & Transportat Engn, Changsha 410075, Peoples R China.;[Li, Shuangyan] Cent South Univ Forestry & Technol, Coll Logist & Transportat, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Ji, B ] C;Cent South Univ, Sch Traff & Transportat Engn, Changsha 410075, Peoples R China.
关键词：
Two-echelon capacitated vehicle routing problem;sharing satellite resources;mixed integer linear programming model;adaptive large neighborhood search
摘要：
Collaboration vehicle routing has garnered increasing attention recently because it can help enterprises reduce costs by sharing resources. This paper addresses a novel two-echelon capacitated vehicle routing problem with sharing satellite resources (2E-CVRPSSR), which arises with the development of e-commerce and the Sharing economy in city logistics. In this problem, goods are delivered within a two-echelon routing network, where satellites are used to consolidate and transfer goods between first-and second-echelon routing. Moreover, the second-echelon vehicles can depart from and return to different satellites. A mixed integer linear programming model is first presented, and an adaptive large neighborhood search algorithm with several new search operators and strategies is proposed to solve this problem. The numerical results show that the proposed algorithm can effectively solve the 2E-CVRPSSR. Moreover, an average transportation cost savings of 6.29% can be obtained by sharing satellite resources. In addition, geographic analysis indicates that the layout of the depot, satellites, and customers largely impacts the economic advantages of sharing satellite resources. Specifically, the highest economic benefits are achieved when the satellites are distributed from nearest to farthest from the depot, with customers located between nearby and distant satellites and with satellites of large enough capacity close to the depot.
摘要：
Antimicrobial resistance is a global health security issue of widespread concern. Recent studies have unveiled the potential contribution of non-antibiotics to the emergence of antimicrobial resistance. This study investigated the effect of carbamazepine, a non-antibiotic pharmaceutical, on the fate of antibiotic resistance genes (ARGs) during anaerobic digestion. The results, as revealed by both metagenomic sequencing and absolute quantification, demonstrated that carbamazepine induced the enrichment of ARGs and increased the abundance of ARGs hosts by 1.2-2.1 times. Carbamazepine facilitated microbial aggregation and intercellular communication by upregulating functional genes associated with two-component systems, quorum sensing and type IV secretion systems, thereby increasing the frequency of ARGs conjugation. Furthermore, carbamazepine induced the acquisition of ARGs by pathogens and elevated the overall pathogenic abundance. This study revealed the mechanisms of microbial self-regulation and ARGs transmission under carbamazepine stress, highlighting the potential health risks posed by non-antibiotic pharmaceuticals during the safe disposal of sludge.
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.
期刊：
Journal of Environmental Management,2024年351:119688 ISSN：0301-4797
通讯作者：
Zhang, C;Yan, WD
作者机构：
[Ye, Zhencheng; Zhang, Chao; Wang, Wancai; Zhang, C; Li, Jing] Northwest A&F Univ, Key Lab Soil Eros & Dryland Farming Loess Plateau, Yangling 712100, Peoples R China.;[Liu, Guobin; Zhang, Chao] Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, Yangling 712100, Peoples R China.;[Wang, Zhaoyang; Wu, Qixiao; He, Guoqin] Cent South Univ Forestry & Technol, Bangor Coll China Joint Unit Bangor Univ, Changsha 410004, Hunan, Peoples R China.;[Yan, Wende] Cent South Univ Forestry & Technol, Natl Engn Lab Appl Technol Forestry & Ecol South C, Changsha 410004, Peoples R China.
通讯机构：
[Zhang, C ] N;[Yan, WD ] C;Northwest A&F Univ, Key Lab Soil Eros & Dryland Farming Loess Plateau, Yangling 712100, Peoples R China.;Cent South Univ Forestry & Technol, Natl Engn Lab Appl Technol Forestry & Ecol South C, Changsha 410004, Peoples R China.
关键词：
Abundant taxa;Agricultural ecosystem;Greenhouse gas emissions;Multinutrient cycling;Rare taxa
摘要：
The field practices, including irrigation and fertilization, strongly affect greenhouse gas emissions and soil nutrient cycling from agriculture. Understanding the underlying mechanism of greenhouse gas emissions, soil nutrient cycling, and their impact factors (fungal diversity, network characteristics, soil pH, salt, and moisture) is essential for efficiently managing global greenhouse gas mitigation and agricultural production. By considering abundant and rare taxa, we determine the identities and relative importance of ecological processes that modulate the fungal communities and identify whether they are crucial contributors to soil nutrient cycling and greenhouse gas emissions. The research is based on a 4-year field fertigation experiment with low (300kg/ha P(2)O(5) with 150kg/ha urea) and high (600kg/ha P(2)O(5) with 300kg/ha urea) fertilization level and three irrigation levels, that is, low (200mm), medium (300mm), and high (400mm). The α-diversity (richness and Shannon index) of fungal subcommunities was significantly higher under medium irrigation (300mm) and low fertilization (300kg/ha P(2)O(5) with 150kg/ha urea) than under other treatments. Intermediate irrigation with low fertilization treatment yielded the most significant higher multinutrient cycling index and the lowest CO(2) and CH(4) emissions. The null model indicated that abundant taxa are mainly regulated by stochastic processes (dispersal limitation), and rare taxa are mainly regulated by environmental selection, especially by soil salinity. The co-occurrence network of rare taxa explained the changes in the entire fungal network stability. The abundant taxa played vital roles in regulating soil nutrient status, owing to the stronger association between their network and multinutrient cycling index. Furthermore, we have confirmed that soil moisture and fungal network stability are crucial factors affecting greenhouse gas emissions. Together, these results provide a deep understanding of the mechanisms that reveal fungal community assembly and soil fungal-driven variations in nutrient status and network stability, link fungal network characteristics to ecosystem functions, and reveal the factors that influence greenhouse gas emissions.
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.
期刊：
Journal of Luminescence,2024年268:120434 ISSN：0022-2313
通讯作者：
Zhang, XM
作者机构：
[Zhang, XM; Long, Fenzhong; Wu, Pianpian; Fu, Jiawei; Zhang, Xinmin] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Hunan Prov Key Lab Mat Surface & Interface Sci & T, Changsha 410004, Peoples R China.
通讯机构：
[Zhang, XM ] C;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Hunan Prov Key Lab Mat Surface & Interface Sci & T, Changsha 410004, Peoples R China.
关键词：
Chloroborate;Phosphor;Site occupation;White LED
摘要：
Investigation on Ce3+ ions occupying different cation sites of a specific compound is of great significance for exploring multicolor phosphors. Herein, we report the luminescent properties of Ce3+ in chloroborate Ca2BO3Cl host. Two kinds of Ce3+ f -d transitions have been observed via adjusting the doping concentration. The assignment for different Ce3+ sites to certain cation sites is corroborated by structural analysis (XRD), fluorescence spectroscopy (PL) and decay kinetic analysis. Information on the two Ce3+ sites' wavelengths of the five 5d bands in the Ca2BO3Cl host lattice together with ecfs, ec, D and Delta S are obtained. Moreover, with the increasing of Ce3+ doping concentration, the emission peak shows an obviously redshift, and the emission color changes from dark blue to blue. The tuning luminescence properties are attributed to the energy transfer from Ce II to Ce I. The optical properties of the as-fabricated white light-emitting diode (LED) are studied. However, the optical properties of current studied Ce3+ doped Ca2BO3Cl is not good enough to be a candidate for near-UV chip excited phosphor-converted white LED.
摘要：
Transformation of biomass wastes or residues into functional carbon materials is one of the main approaches to improve their added value and utilization rate. In this work, an example of discarded bamboo fibers was used to fabricate trimetallic functionalized 1D carbon composite with excellent electromagnetic wave (EW) absorption performances, via a simple solvothermal-carbonization method. When the thickness is below 2.0 mm, the composite has a minimum reflection loss (RLmin) of -61.6 dB and a specific RL value of -253 dB mg-1 mm-1, as well as an effective absorption band of 5.4 GHz at a low mass loading of 15 wt%. Such good performances are attributed to the synergetic effect of dielectric loss from bamboo fiber carbon and magnetic loss from Fe-Co-Ni interaction that greatly improved the impedance matching. In addition, bamboo fibers with rough surface could endow ample core-shell FeCoNi nanoparticles to uniform embed, which brings large number of interfaces and defects for the composite to enhance the electromagnetic loss capacity. This work provides a trimetallic compositing idea and a sustainable design approach for using biomass wastes to produce stable and efficient EW absorption materials.
作者：
Su, Jiahui;Yang, Yadong;Wan, Caichao*;Li, Xingong;Chai, Yaling;...
期刊：
研究(英文),2024年7:0317 ISSN：2096-5168
通讯作者：
Wan, Caichao;Wu, YQ;Wan, CC
作者机构：
[Yang, Yadong; Li, Xingong; Wu, Yiqiang; Yuan, Jianzhong; Wan, Caichao; Chai, Huayun; Su, Jiahui; Wan, CC; Chai, Yaling] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;[Wan, Caichao; Wan, CC] Yihua Lifestyle Technol Co Ltd, Shantou 515834, Peoples R China.
通讯机构：
[Wu, YQ ; Wan, CC] C;[Wan, CC ] Y;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;Yihua Lifestyle Technol Co Ltd, Shantou 515834, Peoples R China.
摘要：
Silica glass, known for its brittleness, weight, and non-biodegradable nature, faces challenges in finding suitable alternatives. Transparent wood, made by infusing polymers into wood, shows promise but is hindered by limited availability of wood in China and fire risks associated with its use. This study explores the potential of utilizing bamboo, which has a shorter growth cycle, as a valuable resource for developing flame-retardant, smoke-suppressing, and superhydrophobic transparent bamboo. A 3-layered flame-retardant barrier, composed of a top silane layer, an intermediate layer of SiO(2) formed through hydrolysis-condensation of Na(2)SiO(3) on the surface, and an inner layer of Na(2)SiO(3), has been confirmed to be effective in reducing heat release, slowing flame spread, and inhibiting the release of combustible volatiles, toxic smoke, and CO. Compared to natural bamboo and other congeneric transparent products, the transparent bamboo displays remarkable superiority, with the majority of parameters being notably lower by an entire order of magnitude. It achieves a long ignition time of 116 s, low total heat release (0.7 MJ/m(2)), low total smoke production (0.063 m(2)), and low peak CO concentration (0.008 kg/kg). Moreover, when used as a substrate for perovskite solar cells, the transparent bamboo displays the potential to act as a light management layer, leading to a marked efficiency enhancement of 15.29%. The excellent features of transparent bamboo make it an enticing choice for future advancements in flame-retardant glasses and optical devices.
