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Preparation of K-doped g-C_(3)N_(4) composite loaded on magnetic attapulgite and its degradation performance for malachite green

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Chinese Journal of Chemical Engineering 2024年第7期71卷 110-121页

作者： Aishun Ma Hanlin Qian hongxia liu Sili Ren Jiangxi Key Laboratory of Mining&Metallurgy Environmental Pollution Control Jiangxi University of Science and TechnologyGanzhou 341000China Jiangxi Provincial Key Laboratory of Low-Carbon Processing and Utilization of Strategic Metal Mineral Resources Jiangxi University of Science and TechnologyGanzhou 341000China

Visible-light-driven photocatalysis is a promising technology for the treatment of dye *** this work,a novel photocatalyst of K-doped g-C_(3)N_(4) loaded on magnetic attapulgite(ATP)(Kω-g-C_(3)N_(4)@ATP-Fe_(3)O_(4))with excellent visible light photocatalytic properties and stability were successfully prepared and *** removal efficiency of Kω-g-C_(3)N_(4)@ATP-Fe_(3)O_(4) for malachite green(MG)was studied,and the degradation mechanism was analyzed and *** was found that the K_(5)-g-C_(3)N_(4)@ATP-Fe_(3)O_(4) photocatalyst possessed excellent degradation efficiency of over 98.0%for the MG dye wastewater under optimal ***,the K_(5)-g-C_(3)N_(4)@ATP-Fe_(3)O_(4) materials possessed good recyclability with a removal rate over 82%after 4 *** visible light condition,the K_(5)-g-C_(3)N_(4)@ATP-Fe_(3)O_(4) photocatalyst produce radicals of·OH and O_(2)^(-)to degrade the MG dyes,which was supported by electron paramagnetic resonance(EPR)and radical trapping *** addition,the LC-MS analysis interpreted the degradation pathways and intermediates of MG in the *** findings in this work indicate that the prepared photocatalytic material has excellent degradation efficiency for MG and can be applied in dye wastewater treatment.

关键词： Photocatalyst Malachite green K-doped g-C_(3)N_(4) Degradation

Performance investigations of novel dual-material gate(DMG) MOSFET with dielectric pockets(DP)

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Science China(Technological Sciences) 2009年第8期52卷 2400-2405页

作者： LUAN SuZhen liu hongxia JIA RenXu Key Laboratory of Ministry of Education of China for Wide Band-Gap Semiconductor Materials and Devices School of MicroelectronicsXidian UniversityXi’an 710071China

Dual-material gate MOSFET with dielectric pockets (DMGDP MOSFET) is proposed to eliminate the potential weakness of the DP MOSFET for CMOS scaling toward the 32 nm gate length and beyond. The short-channel effects (SCE) can be effectively suppressed by the insulator near the source/drain regions. And the suppression capability can be even better than the DP MOSFET due to the drain bias absorbed by the screen gate. The speed performance and electronic characteristics of the DMGDP MOSFET are comprehensively studied. Compared to the experimental data from Jurczak et al., the DMGDP PMOSFET exhibits good subthreshold characteristics and the on-state current is almost the twice that of the DP PMOSFET. The intrinsic delay of the NMOS reaches 21% greater than the DP MOSFET for 32 nm node. The higher fT of 390 GHz is achieved, which is a 32% enhancement in comparison with the DP MOSFET when the gate length is 50 nm. Finally, the design guideline and the optimal regions of the DMGDP MOSFET are discussed.

关键词： dual material gate (DMG) dielectric pockets (DP) short-channel effect (SCE) cutoff frequency

Highly inhibited transport of dissolved thallium(I) in manganese oxide-coated sand: Chemical condition effects and retention mechanisms

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Journal of Environmental Sciences 2023年第7期129卷 104-114页

作者： Xiaoliu Huangfu Ziqiang liu Hainan Wang Qiang He hongxia liu Caihong liu Key Laboratory of Eco-Environments in Three Gorges Reservoir Region Ministry of EducationCollege of Environment and EcologyChongqing UniversityChongqing 400044China State Key Laboratory of Pollution Control and Resource Reuse School of EnvironmentNanjing UniversityNanjing 210023China

Thallium contamination in water can cause great danger to the *** this study,we synthesized manganese oxide-coated sand(MOCS)and investigated the transport and retention behaviors of Tl(I)in MOCS under different *** methods combined with a two-site nonequilibrium transport model were applied to explore the *** results showed that Tl(I)mobility was strongly inhibited in MOCS media,and the retention capacity calculated from the fitted model was 510.41 mg/g under neutral *** retention process included adsorption and oxidative precipitation by the manganese oxides coated on the sand *** with the same concentration of Mn(II)led to halving Tl(I)retention due to competition for reactive *** Tl(I)retention was observed under alkaline conditions,as increasing pH promoted electronegativity on the media ***,the competitive cation Ca^(2+)significantly weakened Tl(I)retention by occupying adsorption *** findings provide new insights into understanding Tl(I)transport behavior in water-saturated porous media and suggest that manganese oxide-coated sand can be a cost-effective filter media for treating Tl-contaminated water.

关键词： Thallium(I) Manganese oxide-coated sand Transport and retention Adsorption Oxidative precipitation

Low leakage 3×VDD-tolerant ESD detection circuit without deep N-well in a standard 90-nm low-voltage CMOS process

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Science China(Technological Sciences) 2013年第8期56卷 2046-2051页

作者： YANG ZhaoNian liu hongxia WANG ShuLong Key Laboratory of Wide Bandgap Semiconductor Materials and Devices of Ministry of Educ13ation School of MicroelectronicsXidian University

A new low leakage 3×VDD-tolerant electrostatic discharge(ESD)detection circuit using only low-voltage device without deep N-well is proposed in a standard 90-nm 1.2-V CMOS ***-transistors technique is adopted to sustain high-voltage stress and reduce leakage *** NMOSFET operates in high voltage range and it is unnecessary to use any deep *** proposed detection circuit can generate a 38 mA current to turn on the substrate triggered silicon-controlled rectifier(STSCR)under the ESD *** normal operating conditions,all the devices are free from over-stress voltage *** leakage current is 88 nA under 3×VDD bias at 25°*** simulation result shows the circuit can be successfully used for 3×VDD-tolerant I/O buffer.

关键词： detection circuit electrostatic discharge(ESD) leakage current over-stress voltage stacked-transistors

STABILITY OF RAREFACTION WAVE FOR A MACROSCOPIC MODEL DERIVED FROM THE VLASOV-MAXWELL-BOLTZMANN SYSTEM

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Acta Mathematica Scientia 2018年第3期38卷 857-888页

作者： Yongting HUANG hongxia liu Department of Mathematics City University of Hong Kon Department of Mathematics Jinan Universit

In this article, we are concerned with the nonlinear stability of the rarefaction wave for a one-dimensional macroscopic model derived from the Vlasov-Maxwell-Boltzmann system. The result shows that the large-time behavior of the solutions coincides with the one for both the Navier-Stokes-Poisson system and the Navier-Stokes system. Both the timedecay property of the rarefaction wave profile and the influence of the electromagnetic field play a key role in the analysis.

关键词： Vlasov-Maxwell-Boltzmann system rarefaction wave energy method

Zygmund functions on the real line and quasiconformal deformations

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Science China Mathematics 2013年第4期56卷 757-769页

作者： SHEN YuLiang liu hongxia WANG LiJun Department of Mathematics Soochow University

By a complex approach,we obtain some results concerning Zygmund functions on the real line,which corresponds to some classical results about Zygmund functions on the unit circle.

关键词： Zygmund function quasiconformal deformation analytic function

A novel ESD power supply clamp circuit with double pull-down paths

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Science China(Information Sciences) 2013年第10期56卷 172-179页

作者： liu hongxia YANG ZhaoNian LI Li ZHUO QingQing Key Laboratory of Ministry of Education for Wide Band-Gap Semiconductor Materials and Devices School of Microelectronics Xidian University

Electrostatic-discharge(ESD)protection design is one of the key challenges of advanced CMOS ***-triggered and MOSFET-based power supply ESD clamp circuits have been widely used to obtain the desired ESD protection *** this paper,a MOSFET-based ESD power clamp circuit with only10 ns RC time constant for 0.18-μm process is presented.A double pull-down path is proposed to avoid false triggering,reject power supply noise and reduce energy *** performance of the novel clamp circuit is excellent,consuming very small layout *** simulation results show that this clamp circuit can be used in industry.

关键词： ESD(electrostatic-discharge) clamp circuit duration false triggering power supply noise

Novel Lipase from Golden Pompano(Trachinotus ovatus)Viscera:Purification,Characterization,and Application in the Concentrating of n-3 Polyunsaturated Fatty Acids

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Journal of Ocean University of China 2023年第2期22卷 501-508页

作者： liu hongxia liu Shucheng ZHANG Xueying liu Zhongyuan LI Chuan XIA Guanghua SHEN Xuanri Hainan Engineering Research Center of Aquatic Resources Efficient Utilization in South China Sea Key Laboratory of Food Nutrition and Functional Food of Hainan ProvinceKey Laboratory of Seafood Processing of HaikouCollege of Food Science and TechnologyHainan UniversityHaikou 570228China Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety Guangdong Ocean UniversityZhanjiang 524000China Collaborative Innovation Center of Provincial and Ministerial Co-Construction for Marine Food Deep Processing Dalian Polytechnic UniversityDalian 116034China

Lipases have been widely applied in a variety of industrial fields,such as food,pharmaceuticals,biofuels,and *** years have witnessed a great interest in modifying lipids for the production of triacylglycerols enriched with n-3 polyunsaturated fatty acids(PUFAs).Here,a novel salt-tolerant,organic solvent-stable,and bile salt-activated lipase was purified from golden pompano(Trachinotus ovatus)viscera,which was named as golden pompano lipase(GPL).GPL had a specific activity of 57.2U mg^(-1)with an estimated molecular weight of 14 k Da,exhibited optimal activity at 40℃a nd pH 8.0,and showed K_(m)and V_(max)of 40.16μmol L^(-1)and 769.23μmol L^(-1)min^(-1),*** activity was enhanced by Mn^(2+)and sodium *** was active in organic solvents,including methanol,ethanol,chloroform,and *** also showed a good salinity tolerance of up to 1 mol L^(-1).n-3PUFA enrichment in the glyceride fraction of golden pompano oil was performed by GPL-catalyzed hydrolysis and yielded a total PUFA concentration of 56.99%.EPA,DHA,and DPA were enriched by 10.4-,3.2-,and 1.8-fold of their initial levels,*** study recognized the industrial applicability of GPL to prepare enriched C_(20-22)n-3 PUFA.

关键词： golden pompano lipase characterization n-3 polyunsaturated fatty acids

Preparation and Characterization of Electrospun Polylactic Acid Micro/Nanofibers under Different Solvent Conditions

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Fluid Dynamics & Materials Processing 2021年第3期17卷 629-638页

作者： Hao Dou hongxia liu Feng Wang Yanli Sun School of Textile Science and Engineering Xi’an Polytechnic UniversityXi’an710048China State Key Laboratory of Intelligent Textile Material and Products Xi’an Polytechnic UniversityXi’an710048China

Electrospinning is a versatile and popular method for the fabrication of ultrafine fibers and many parameters in electrospinning can be adjusted when ideal micro/nanofibers are *** particular,the selection of a proper solvent condition is a fundamental and crucial step to produce electrospun ultrafine *** this study,a commonly used biomaterial,polylactic acid(PLA),was dissolved in 7 different solvents and PLA micro/nanofibers were prepared by *** morphology,porosity,mechanical property and static contact angle were characterized to determine the quality of the obtained *** results show that different solvent conditions have a significant effect on both the diameter,surface smooth degree of PLA micro/nanofibers and the properties of the fibrous membranes.

关键词： PLA micro/nanofibers solvent conditions electrospinning