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Exfoliated Mg–Al–Fe layered double hydroxides/polyether sulfone mixed matrix membranes for adsorption of phosphate and fluoride from aqueous solutions

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Journal of Environmental Sciences 2018年第8期30卷 63-73页

作者： Zhiqian Jia Shuang Hao xiaoyu lu Lab for Membrane Science and Technology College of Chemistry Beijing Normal University

Mg–Al–Fe layered double hydroxides（LDHs） were exfoliated and incorporated in polyether sulfone membranes for the removal of phosphate and fluoride for the first time. The exfoliation methods, coagulation bath, LDH amount, interfering ions, adsorption isotherm,desorption and reuse of the membranes were investigated. It was found that LDHs could be quickly exfoliated in formamide/N,N-dimethylformamide（DMF） solvent mixtures with sodium carboxymethyl cellulose as a stabilizer. The membranes displayed much higher adsorption capacity for phosphate（5.61 mg/g） and faster adsorption rate than the unexfoliated materials. With increased DMF content in the coagulation bath, the static and dynamic adsorption capacity rose. Interference from Cl-and SO4^（2-）（50 mg/L） on adsorption of phosphates was not apparent. The membranes displayed excellent reusability in dynamic adsorption/desorption. The membranes also showed high adsorption capacity for fluorides（1.61 mg/g）.

关键词： Layered double hydroxides Membrane Adsorption Phosphate Fluoride Exfoliation

Microstructural evolution of ternary Ag33Cu-42Ge25 eutectic alloy inside ultrasonic field

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Progress in Natural Science:Materials International 2014年第5期24卷 642-648页

作者： Wei Zhai xiaoyu lu Bingbo Wei Department of Applied Physics Northwestern Polytechnical University

Ultrasonic field with a frequency of 20 k Hz is introduced into the solidification process of ternary Ag33Cu42Ge25 eutectic alloy from the sample bottom to its top. The ultrasound stimulates the nucleation of alloy melt and prevents its bulk undercooling. At low ultrasound power of 250 W,the primary ε2phase in the whole alloy sample grows into non-faceted equiaxed grains, which differs to its faceted morphology of long strip under static condition. The pseudobinary(Ag t ε2) eutectic transits from dendrite shape grain composed of rod type eutectic to equiaxed chrysanthemus shape formed by lamellar structure. By contrast, the ultrasound produces no obvious variation in the morphology of ternary(Ag t Ge t ε2) eutectic except a coarsening effect. When ultrasound power rises to 500 W, divorced ternary(Ag t Ge t ε2) eutectic forms at the sample bottom. However, in the upper part, the ultrasonic energy weakens, and it only brings about prominent refining effect to primary ε*** microstructural evolution mechanism is investigated on the cavitation, acoustic streaming and acoustic attenuation.

关键词： Dynamic solidification Cavitation effect Ternary alloy Nucleation Eutectic growth

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Rapid monotectic solidification under free fall condition

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Science China(Technological Sciences) 2004年第4期47卷 409-420页

作者： LIU Xiangrong lu xiaoyu WEI Bingbo Laboratory of Materials Science in Space Department of Applied Physics Northwestern Polytechnical University Xi'an 710072 China Laboratory of Materials Science in Space Department of Applied Physics Northwestern Polytechnical University Xi'an 710072 China Laboratory of Materials Science in Space Department of Applied Physics Northwestern Polytechnical University Xi'an 710072 China

Fe-48.8% Sn monotectic, Fe-40% Sn hypomonotectic and Fe-58% Sn hypermonotectic alloys have been rapidly solidified during free fall processing in drop tube. For droplets of 100–1000 μm, the maximum undercooling for Fe-48.8% Sn, Fe-40% Sn and Fe-58% Sn alloys is 270, 282 and 288 K respectively. For Fe-48.8% Sn monotectic alloy, a homogeneously dispersed microstructure can be obtained when the droplet diameter is small, and the Marangoni migration velocity Vm is 37 times as fast as Stokes velocity Vs when the dispersion sphere radius is 6 μm and undercooling is 30 K. For Fe-40% Sn hypomonotectic alloy, the microstructure undergoes a transition from columnar α-Fe dendrites distributed in Sn-rich matrix to α-Fe particles. The growth velocity of α-Fe dendrite changes from 0.45 to 4.65 m/s when the droplet diameter varies from 1000 to 100 μm. For Fe-58.8% Sn hypermonotectic alloy, the grain size of primary α-Fe dendrites decreases remarkably when undercooling increases. Keywords monotectic solidification - phase separation - undercooling - containerless processing

关键词： monotectic solidification, phase separation, undercooling, containerless processing.

Laser-induced jigsaw-like graphene structure inspired by Oxalis corniculata ***

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Bio-Design and Manufacturing 2022年第4期5卷 700-713页

作者： Wentao Wang Longsheng lu xiaoyu lu Zhanbo Liang Biao Tang Yingxi Xie School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510641China Guangdong Provincial Key Laboratory of Optical Information Materials and Technology South China Normal UniversityGuangzhou 510006China

The laser scribing of polyimide(PI, Kapton) film is a new, simple and effective method for graphene preparation. Moreover,the superhydrophobic surface modification can undoubtedly widen the application fields of graphene. Herein, inspired by the hydrophobic and self-cleaning properties of natural Oxalis corniculata Linn. leaves, we propose a novel bionic manufacturing method for superhydrophobic laser-induced graphene(LIG). By tailoring the geometric parameters(size, roughness and height/area ratio) and chemical composition, the three-dimensional(3D) multistage LIG, i.e., with micro-jigsaw-like and porous structure, can deliver a static water contact angle(WCA) of 153.5° ± 0.6°, a water sliding angle(WSA) of 2.5° ±0.5°, and great superhydrophobic stability lasting for 100 days(WCAs ≈ 150°). This outstanding water repellency is achieved by the secondary structure of jigsaw-like LIG, a porous morphology that traps air layers at the solid–liquid interface. The robust self-cleaning and anti-stick functions of 3D bionic and multistage LIG are demonstrated to confirm its great potential in wearable electronics.

关键词： Laser-induced graphene Oxalis corniculata Linn Bionic Multistage structure Superhydrophobic surface

Peritectic solidification under high undercooling conditions

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Chinese Science Bulletin 1999年第14期44卷 1338-1343页

作者： Chongde Cao xiaoyu lu Bingbo Wei Northwestern Polytech Univ Dept Appl Phys Xian 710072 Peoples R China

The solidification characteristics of highly undercooled Cu-7.77% Co peritectic alloy has been examined by glass fluxing technique. The obtained undercoolings vary from 93 to 203 K(0.14 T_L). It is found that the a(Co) phase always nucleates and grows preferentially, which is followed by peritectic transformation. This means that the peritectic phase cannot form directly, even though the alloy melt is undercooled to a temperature far below its peritectic point. The maximum recalescence temperature measured experimentally decreases as undercooling increases, which is lower than the thermodynamic calculation result owing to the actual non-adiabatic nature of recalescence process. The dendritic fragmentation of primary α(Co) phase induced by high undercooling is found to enhance the completion of peritectic transformation. In addition, the LKT/BCT dendrite growth model is modified in order to make it applicable to those binary alloy systems with seriously curved liquidus and solidus lines. The dendrite

关键词： peritectic solidification undercooling nucleation recalescence dendrite growth.

Development of polymorphic SSR markers and their applicability in genetic diversity evaluation in Euptelea pleiosperma

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BIOCELL 2022年第11期46卷 2489-2495页

作者： XIAOJUN ZHOU xiaoyu lu XUBO WANG College of Life Science Luoyang Normal UniversityLuoyang471934China

Euptelea pleiosperma is a characteristic species of East Asian flora with both ornamental and scientific *** on the reduced-representation sequencing(RRS)technology of RAD-Seq,this study conducted high-throughput Illumina paired-end sequencing to find SSR marker information in the genome of ***,and to screen and verify polymorphism of SSR *** obtained 5.5G of high-quality data using *** total number of contigs of the RAD tags was 299,376,with the maximum contig length of 2,062 bp and the average length of 445 *** these sequences,we identified 20,718 SSR loci,with a distribution density of one SSR per 6.45 kb(1/6.45 kb).Among all SSRs,dinucleotides(52.00%)were the most detected SSRs,followed by mononucleotides(21.63%).AG/CT was the dominant motif in the SSR loci,accounting for 34.8%.Primers were successfully designed for 14,593 loci,and 100 pairs of these primers were randomly selected for chemical synthesis and validated by SSR-PCR amplification in 20 individuals of ***-nine primers were able to amplify the target *** 3.0 software was used to analyze the selected 20 SSR loci with good *** the 20 SSR markers,the number of alleles ranged from 4 to 9,and the observed heterozygosity and expected heterozygosity were from 0.35 to 0.75 and 0.541 to 0.875,*** information content of polymorphic loci ranged from 0.463 to 0.848,with an average value of *** them,there were 18 highly polymorphic loci,and 20 SSR loci did not deviate from the Hardy-Weinberg ***,the 20 pairs of SSR primers were used to conduct PCoA analysis based on Nei’s genetic distance of 51 individuals from three *** results showed that these SSR markers could distinguish genetic differences based on different geographical locations.

关键词： Cluster analysis E.pleiosperma RAD-Seq Rare species SSR markers

Geometric Design-based Dimensional Synthesis of a Novel Metamorphic Multi-fingered Hand with Maximal Workspace

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Chinese Journal of Mechanical Engineering 2021年第3期34卷 211-225页

作者： Wei An Jun Wei xiaoyu lu Jian S.Dai Yanzeng Li MOE Key Laboratory for Mechanism Theory and Equipment Design International Centre for Advanced Mechanisms and RoboticsTianjin UniversityTianjinChina Advanced Kinematics and Reconfigurable Robotics Lab School of Natural and Mathematical SciencesKing’s College LondonLondonUK Rutgers The State University of New JerseyNew BrunswickNew JerseyUSA

Current research on robotic dexterous hands mainly focuses on designing new finger and palm structures,as well as developing smarter control *** the dimensional synthesis of dexterous hands with traditional rigid palms has been carried out,research on the dimensional synthesis of dexterous hands with metamorphic palms remains *** study investigated the dimensional synthesis of a palm of a novel metamorphic multi-fingered hand,and explored the geometric design for maximizing the precision manipulation *** indexes were used to value the workspace of the metamorphic hand,and the best proportions between the five links of the palm to obtain the optimal workspace of the metamorphic hand were *** on the fixed total length of the palm member,four nondimensional design parameters that determine the size of the palm were introduced;through the discretization method,the influence of the four design parameters on the workspace of the metamorphic hand with full-actuated fingers and under-actuated fingers was *** on the analysis of the metamorphic multi-fingered hand,the symmetrical structure of the palm was designed,resulting in the largest workspace of the multi-fingered hand,and proved that the metamorphic palm has a massive upgrade for the workspace of underactuated *** research contributed to the dimensional synthesis of metamorphic dexterous hands,with practical significance for the design and optimization of novel metamorphic hands.

关键词： Metamorphic hands Dimensional synthesis Maximal workspace Discretization

Termite-killing components in Serratia marcescens(SM1)

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Journal of Forestry Research 2021年第4期32卷 1739-1744页

作者： Renjie Fu Jian luo Kai Feng xiaoyu lu Fang Tang Co-Innovation Center for the Sustainable Forestry in Southern China Nanjing Forestry UniversityNanjing 210037People’s Republic of China College of Forestry Nanjing Forestry UniversityNanjing 210037People’s Republic of China

The bacteria,Serratia marcescens(SMI) was previously obtained from the black-winged termite,Odontotermes for mo sanus *** was highly toxic to ***,however,the mechanism of toxicity is *** this study,toxicity test results showed that the main components that affected *** were in a supernatant and that the insecticidal protease in the supernatant resulted in the death of *** addition,zinc sulphate recovery experiments indicated that the metalloproteinases in the supernatant were more *** results provide a theoretical foundation for the future biological control of termites,the basis for the development of pest control technology and the discovery of new pesticides.

关键词： Odontotermes formosanus Shiraki Serratia marcescens strain SM1 Supernatant Protease Metalloproteinases

StripeRust-Pocket:A Mobile-Based Deep Learning Application for Efficient Disease Severity Assessment of Wheat Stripe Rust

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Plant Phenomics 2024年第3期6卷 771-786页

作者： Weizhen Liu Yuxi Chen Zhaoxin lu xiaoyu lu Ze Wu Ziyao Zheng Yongqiang Suo Caixia Lan Xiaohui Yuan School of Computer Science and Artificial Intelligence Wuhan University of TechnologyWuhanHubei 430070China Wuhan University of Technology Chongqing Research Institute Chongqing 401120China Sanya Science and Education Innovation Park of Wuhan University of Technology SanyaHainan 572025China Hubei Hongshan Laboratory College of Plant Science and TechnologyHuazhong Agricultural UniversityWuhan 430070HubeiChina Engineering Research Centre of Chinese Ministry of Education for Edible and Medicinal Fungi Jilin Agricultural UniversityChangchunJilin 130118China

Wheat stripe rust poses a marked threat to global wheat *** and effective disease severity assessments are crucial for disease resistance breeding and timely management of field *** this study,we propose a practical solution using mobile-based deep learning and model-assisted ***-Pocket,a user-friendly mobile application developed based on deep learning models,accurately quantifies disease severity in wheat stripe rust leaf images,even under complex ***,StripeRust-Pocket facilitates image acquisition,result storage,organization,and *** underlying model employed by StripeRust-Pocket,called StripeRustNet,is a balanced lightweight 2-stage *** first stage utilizes MobileNetV2-DeepLabV3+for leaf segmentation,followed by ResNet50-DeepLabV3+in the second stage for lesion *** severity is estimated by calculating the ratio of the lesion pixel area to the leaf pixel *** achieves 98.65%mean intersection over union(MIoU)for leaf segmentation and 86.08%MIoU for lesion *** using an additional 100 field images demonstrated a mean correlation of over 0.964 with 3 expert visual *** address the challenges in manual labeling,we introduce a 2-stage labeling pipeline that combines model-assisted labeling,manual correction,and spatial *** apply this pipeline to our self-collected dataset,reducing the annotation time from 20 min to 3 min per *** method provides an efficient and practical solution for wheat stripe rust severity assessments,empowering wheat breeders and pathologists to implement timely disease *** also demonstrates how to address the"last mile"challenge of applying computer vision technology to plant phenomics.

关键词： application learning pocket deep assessment disease efficient mobile-based severity striperust