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degradation of Rhodamine B by mnFe-LdH/PmS/O_(3) three-phase catalytic system: performance, mechanism and ecotoxicity studies

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Frontiers of Environmental Science & Engineering 2024年第1期18卷 111-127页

作者： Ying Han Ying Yang Weibao Liu Yilong hou Ce Wang Jiangwei Shang Xiuwen Cheng Key Laboratory of Pollutant Chemistry and Environmental Treatment College of Chemistry and Environmental ScienceYili Normal UniversityYining 835000China Key Laboratory for Environmental Pollution Prediction and Control of Gansu Province College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China

This study developed a novel mnFe-LdH/PmS/O3 three-phase catalytic system to degrade the organic dye RhB, which was used to address the drawbacks of persulfate oxidation and ozonation techniques. The structure, ionic and elemental composition, specific surface area, and magnetic properties of the LdHs were investigated using a variety of physicochemical characterization tools. The results showed that mnFe-LdH had a large specific surface area, a rich crystalline phase composition, and a functional group structure. The RhB degradation rate of mnFe-LdH/PmS/O3 was 0.34 min−1, which was much higher than that of other comparative systems. RhB could be completely degraded in 10 min after optimization and had a significant effect on TOC removal. The system was found to be effective over a wide pH range. Common anions were largely unaffected and humic acid acted as an inhibitor. At the same time, the system had generally effective degradation performance for different dyes. Combined with quenching experiments and EPR, it was found that SO4•−, •OH, O_(2)•−, and 1O_(2) all participated in the reaction, and •OH contributed more. The degradation pathway of RhB was derived by LC-mS, and the T.E.S.T. evaluation found that the toxicity of the intermediate product was significantly reduced. Finally, the stability and availability of LdHs were verified using cycling experiments and metal ion leaching. This work provides a theoretical basis and data support for the synergistic catalysis of PmS/O3 and the deep treatment of dye wastewater.

关键词： Rhodamine B Layered double hydroxides Peroxymonosulfate Ozonation

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Fabricating functionally graded Fe-Cr-Co permanent magnetic alloys via laser powder bed fusion

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Journal of Iron and Steel Research International 2024年第3期31卷 729-737页

作者： Ya-zhou He Ya-qing hou Peng Shen Hao Zhang dong Zhou Hang Su Central Iron and Steel Research Institute Co. Ltd.Beijing 100081China material digital R&d Center China Iron and Steel Research Institute Group Co.Ltd.Beijing 100081China

Laser powder bed fusion(LPBF)in-situ alloying technology offers the possibility to construct gradient materials with varied structures and *** graded Fe-Cr-Co permanent magnetic alloys were fabricated by LPBF and in-situ alloying mixed powders of Fe,Cr,and Co *** effects of different Fe,Cr and Co contents on the microstructure,magnetic properties and hardness of Fe-Cr-Co alloys prepared by LPBF were *** as-built Fe-Cr-Co alloys present a single body-centered-cubic phase and have a homogeneous distribution of *** mechanical properties and magnetic properties of the compositionally graded sample show a gradient *** the increase in Cr content,the Vickers hardness of the sample increases,and the saturation magnetization of the sample *** optimal magnetic properties in an isotropic state are given as coercivity HcB=21.65 kA/m,remanence Br=0.70 T and energy product(BH)_(max)=5.35 kJ/m^(3),which are comparable to or higher than the reported magnetic properties in an isotropic state prepared by traditional powder *** in-situ alloying technology has the potential to further explore Fe-Cr-Co magnetic materials,such as those consisting of multiple or more constituent elements,and to maximize the compositional flexibility of magnetic materials.

关键词： Fe-Cr-Co alloy Laser powder bed fusion In-situ alloying Functional material magnetic property

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Competitive oxidation behavior of Ni-based superalloy GH4738 at extreme temperature

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International Journal of minerals,metallurgy and materials 2024年第1期31卷 138-145页

作者： Hui Xu Shufeng Yang Enhui Wang Yunsong Liu Chunyu Guo Xinmei hou Yanling Zhang State Key Laboratory of Advanced metallurgy University of Science and Technology BeijingBeijing 100083China Institute for carbon neutrality University of Science and Technology BeijingBeijing 100083China

A high thrust-to-weight ratio poses challenges to the high-temperature performance of Ni-based superalloys. The oxidation behavior of GH4738 at extreme temperatures has been investigated by isothermal and non-isothermal experiments. As a result of the competitive diffusion of alloying elements, the oxide scale included an outermost porous oxide layer (OOL), an inner relatively dense oxide layer (IOL), and an internal oxide zone (IOZ), depending on the temperature and time. A high temperature led to the formation of large voids at the IOL/IOZ interface. At 1200℃, the continuity of the Cr-rich oxide layer in the IOL was destroyed, and thus, spallation occurred. Extension of oxidation time contributed to the size of Al-rich oxide particles with the increase in the IOZ. Based on this finding,the oxidation kinetics of GH4738 was discussed, and the corresponding oxidation behavior at 900-1100℃ was predicted.

关键词： Ni-based superalloy GH4738 extreme temperature competitive oxidation oxidation mechanism oxidation kinetics

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The changes in soil organic carbon stock and quality across a subalpine forest successional series

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Forest Ecosystems 2024年第4期11卷 423-433页

作者： Fei Li Zhihui Wang Jianfeng hou Xuqing Li dan Wang Wanqin Yang Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation School of Life SciencesTaizhou UniversityTaizhou 318000China Linhai Station of Zhejiang Provincial Forest Ecological Research Taizhou UniversityTaizhou 318000China Taizhou Key Laboratory of mountain Ecological Restoration and Special Industry Cultivation Taizhou UniversityTaizhou 318000China Hawkesbury Institute for the Environment Western Sydney UniversityPenrithNew South WalesAustralia

Soil organic carbon(SOC)affects the function of terrestrial ecosystem and plays a vital role in global carbon ***,large uncertainty still existed regarding the changes in SOC stock and quality with forest ***,the stock and quality of SOC at 1-m soil profile were investigated across a subalpine forest series,including shrub,deciduous broad-leaved forest,broadleaf-conifer mixed forest,middle-age coniferous forest and mature coniferous forest,which located at southeast of Tibetan *** results showed that SOC stock ranged from 9.8 to29.9 kg·m^(-2),and exhibited a hump-shaped response pattern across the forest successional *** highest and lowest SOC stock was observed in the mixed forest and shrub forest,*** SOC stock had no significant relationships with soil temperature and litter stock,but was positively correlated with wood debris ***,the average percentages of polysaccharides,lignins,aromatics and aliphatics based on FTIR spectroscopy were 79.89%,0.94%,18.87%and 0.29%,***,the percentage of polysaccharides exhibited an increasing pattern across the forest successional series except for the sudden decreasing in the mixed forest,while the proportions of lignins,aromatics and aliphatics exhibited a decreasing pattern across the forest successional series except for the sudden increasing in the mixed ***,the humification indices(HIs)were highest in the mixed forest compared to the other four successional stages,which means that the SOC quality in mixed forest was worse than other successional *** addition,the SOC stock,recalcitrant fractions and HIs decreased with increasing soil depth,while the polysaccharides exhibited an increasing *** findings demonstrate that the mixed forest had higher SOC stock and worse SOC quality than other successional *** high proportion of SOC stock(66%at depth of 20-100 cm)and better SOC quality(lower HIs)indicate that deep s

关键词： Forest successional series Soil organic cubon stock molecular composition Humification indices Soil organic carbon quality

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Effect of Ca micro-Alloying on the microstructure and Anti-Corrosion Property of mg0.5Zn0.2Ge Alloy

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Acta metallurgica Sinica(English Letters) 2024年第7期37卷 1147-1160页

作者： Bishan Cheng depeng Li Baikang Xing Ruiqing hou Pingli Jiang Shijie Zhu Shaokang Guan School of materials Science and Engineering and Henan Key Laboratory of Advanced magnesium Alloys Zhengzhou UniversityZhengzhou450001China Center of Advanced Analysis and Gene Sequencing Zhengzhou UniversityZhengzhou450001China Key Laboratory of materials Processing and mold Technology Ministry of EducationZhengzhou450002China

magnesium and its alloys have attracting rising attention as one of biodegradable metallic ***,the rapid corrosion and severe localized corrosion still hinder their extensive applications in *** this study,micro-alloying of Ca(≤0.1 wt%)into mg0.5Zn0.2Ge alloy developed in our previous work was explored to further enhance the corrosion resistance and alleviate the localized corrosion of the *** results reveal that the addition of Ca leads to the transformation of the cathodic mg_(2)Ge phase in mg0.5Zn0.2Ca alloy into anodic mgCaGe phase in Ca-containing alloys,thereby changing the galvanic couples in alloys during *** preferential dissolution of mgCaGe phase promotes the participation of Ca and Ge into the formation of corrosion products,resulting in the enrichment of Ca and Ge in the outmost of corrosion product layer,which stabilizes and passivates the corrosion product layer on mg alloy ***,the enrichment of Zn at the corrosion interface seems to further hinder the corrosion of mg *** of these factors confer a slower and more uniform corrosion on mg0.5Zn0.2GexCa(xdes favorable candidates for the further processing to gain suitable biodegradable mg alloys.

关键词： magnesium alloy micro-alloying Calcium Corrosion resistance

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Self-supervised recalibration network for person re-identification

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defence Technology（防务技术） 2024年第1期31卷 163-178页

作者： Shaoqi hou Zhiming Wang Zhihua dong Ye Li Zhiguo Wang Guangqiang Yin Xinzhong Wang Shenzhen Institute of Information Technology Shenzhen518172China University of Electronic Science and Technology of China Chengdu611731China Kash Institute of Electronics and Information Industry Kashi844099China

The attention mechanism can extract salient features in images,which has been proved to be effective in improving the performance of person re-identification(Re-Id).However,most of the existing attention modules have the following two shortcomings:On the one hand,they mostly use global average pooling to generate context descriptors,without highlighting the guiding role of salient information on descriptor generation,resulting in insufficient ability of the final generated attention mask representation;On the other hand,the design of most attention modules is complicated,which greatly increases the computational cost of the *** solve these problems,this paper proposes an attention module called self-supervised recalibration(SR)block,which introduces both global and local information through adaptive weighted fusion to generate a more refined attention *** particular,a special"Squeeze-Excitation"(SE)unit is designed in the SR block to further process the generated intermediate masks,both for nonlinearizations of the features and for constraint of the resulting computation by controlling the number of ***,we combine the most commonly used Res Net-50 to construct the instantiation model of the SR block,and verify its effectiveness on multiple Re-Id datasets,especially the mean Average Precision(m AP)on the Occluded-duke dataset exceeds the state-of-the-art(SOTA)algorithm by 4.49%.

关键词： Person re-identification Attention mechanism Global information Local information Adaptive weighted fusion

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Enhanced terahertz vibrational absorption spectroscopy using an integrated high-Q resonator

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Photonics Research 2024年第7期12卷 1542-1547页

作者： ZHIBO hou LIAO CHEN RONGWU LIU CHI ZHANG XIAOJUN WU XINLIANG ZHANG Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Optics Valley Laboratory Wuhan 430074China School of Electronic and Information Engineering Beihang UniversityBeijing 100191China

The terahertz(THz) absorption spectrum is a powerful method to identify substances. The improvement focuses on sensitivity and recovery ability. Here, we demonstrate enhanced THz vibrational absorption spectroscopy based on an on-chip THz whispering gallery mode resonator(THz-WGmR). A THz-WGmR with high Q can store energy and enhance the interaction between the THz waves and the target substances to capture the unique absorption fingerprint information. Therefore, it possesses significant sensitivity to identify trace amounts of substances. As a proof of concept, lactose powder and glucose powder are applied to demonstrate the effectiveness of our approach in recovering fingerprint absorption spectroscopy. Compared with a straight waveguide, the high sensitivity of the THz-WGmR is illustrated. The change of the transmissivity caused by the lactose reaches 7.8 d B around 532 GHz for the THz-WGmR, while only 1.4 d B for the straight waveguide, demonstrating the state-ofthe-art sensing performance in fingerprint absorption recovery. We believe the proposed integrated THz-WGmR will promote the THz identification of tiny fingerprint substances.

关键词： resonator waveguide absorption

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Numerical calculation of Z-scan measurements for nonlinear media with large phase shift

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Optoelectronics Letters 2024年第3期20卷 177-182页

作者： m.d.Zidan A.Allahham department of Physics Atomic Energy Commission of SyriaP.O.Box 6091DamascusSyria

We have reported the characteristics of a Z-scan for the poly(azaneylylidene-acylene)(dAZA) polymer, as nonlinear medium with a large nonlinear phase shift using continuous-wave(CW) laser beam. It has been verified that the Fresnel diffraction model is applicable for analyses of Z-scan measurements with dAZA polymer at high laser power. It was found that Z-scan curves with peak-to-valley features appear as the applied light intensity increases in the case of a large nonlinear phase shift. The Z-scan experiments were carried out using a CW laser to verify the theoretical calculations in the case of a large nonlinear phase shift model. Our results show good agreements between the experimental data and the proposed theoretical models.

关键词： nonlinear phase media

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Thermal Property Enhancement of a Novel Shape-Stabilized Sodium Acetate Trihydrate-Acetamide/Expanded Graphite-Based Composite Phase Change material

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Journal of Thermal Science 2024年第4期33卷 1564-1576页

作者： AN Zhoujian hou Wenjie dU Xiaoze HUANG Zhongzheng mOmBEKI PEA Hamir Johan ZHANG dong LIU Xiaomin College of Energy and Power Engineering Lanzhou University of TechnologyLanzhou730050China Key Laboratory of multi-supply System with Solar Energy and Biomass of Gansu Province Lanzhou730050China Gansu Natural Energy Research Institute Lanzhou730046China

Phase change materials(PCms)are a kind of highly efficient thermal storage materials which have a bright application prospect in many fields such as energy conservation in buildings,waste heat recovery,battery thermal management and so *** inorganic hydrated salt PCms have received increasing attention from researchers due to their advantages of being inexpensive and ***,inorganic hydrated salt PCms are still limited by the aspects of inappropriate phase change temperature,liquid phase leakage,large supercooling and severe phase separation in the application *** this work,sodium acetate trihydrate was selected as the basic inorganic PCm,and a novel shape-stabilized composite phase change material(CPCm)with good thermal properties was prepared by adding various functional *** first,the sodium acetate trihydrate-acetamide binary mixture was prepared and the melting point was adjusted using *** the binary mixture was incorporated into expanded graphite to synthesize a novel shape-stabilized *** thermophysical properties of the resultant shape-stabilized CPCm were systematically *** microscopic morphology and chemical structure of the obtained shape-stabilized CPCm were characterized and *** experiment results pointed out that acetamide could effectively lower the melting point of sodium acetate *** obtained shape-stabilized CPCm modified with additional 18%(mass fraction)acetamide and 12%(mass fraction)expanded graphite exhibited good shape stability and thermophysical characteristics:a low supercooling degree of 1.75℃and an appropriate melting temperature of 40.77℃were obtained;the latent heat of 151.64 kJ/kg and thermal conductivity of 1.411 W/(m·K)were also ***,after 50accelerated melting-freezing cycles,the obtained shape-stabilized CPCm represented good thermal reliability.

关键词： sodium acetate trihydrate melting point modification agent expanded graphite shape stability thermal conductivity enhancement

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

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Science China Chemistry 2024年第7期67卷 2215-2223页

作者： Yanmin Zou Shiyao Li dandan Zheng Jianyong Feng Sibo Wang Yidong hou Guigang Zhang State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350108China College of Environment and Safety Engineering Fuzhou UniversityFuzhou 350108China Collaborative Innovation Center of Advanced microstructures National Laboratory of Solid State MicrostructuresCollege of Engineering and Applied SciencesNanjing UniversityNanjing 210093China

Polymeric carbon nitride has been widely developed as a promising photocatalyst for solar hydrogen production via photocatalytic water ***,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 ***,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 ***,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 ***,the optimized poly(heptazine imide)nanoplates achieve an apparent quantum efficiency of up to 17.3%at 500 nm for photocatalytic hydrogen production from *** work shares new idea for rational control of the optical absorption and charge carrier dynamics of poly(heptazine imide).

关键词： photocatalysis poly heptazine imide nanoplates ion intercalation hydrogen production

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