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P08 Comparing study in self-motivation learning： PBL vs LBL

中国药理通讯 2006年第2期23卷 18-19页

作者： HG NIE JQ CAI mj wei ZG SONG WB JIN JM LI XS YU BZ SUN department of pharmacology medical education research center China Medical UniversityLN Shenyang 110001

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MoS_(2)Lubricate‑Toughened MXene/ANF Composites for Multifunctional Electromagnetic Interference Shielding

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Nano-Micro Letters 2025年第2期17卷 358-371页

作者： Jiaen Wang wei Ming Longfu Chen Tianliang Song Moxi Yele Hao Zhang Long Yang Gegen Sarula Benliang Liang Luting Yan Guangsheng Wang School of Physical Science and Engineering Beijing Jiaotong UniversityBeijing 100044People’s Republic of China Key Laboratory of Bio‑Inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang UniversityBeijing 100191People’s Republic of China

The design and fabrication of high toughness electromagnetic interference(EMI)shielding composite films with diminished reflection are an imperative task to solve electromagnetic pollution *** MXene/ANF(aramid nanofibers)–MoS_(2)composite films with nacre-like layered structure here are fabricated after the introduction of MoS_(2)into binary MXene/ANF composite *** introduction of MoS_(2)fulfills an impressive“kill three birds with one stone”improvement effect:lubrication toughening mechanical performance,reduction in secondary reflection pollution of electromagnetic wave,and improvement in the performance of photothermal *** the introduction of MoS_(2)into binary MXene/ANF(mass ratio of 50:50),the strain to failure and tensile strength increase from 22.1±1.7%and 105.7±6.4 MPa and to 25.8±0.7%and 167.3±9.1 MPa,*** toughness elevates from 13.0±4.1 to 26.3±0.8 mj m^(−3)(~102.3%)*** the reflection shielding effectiveness(SE_(R))of MXene/ANF(mass ratio of 50:50)decreases~10.8%.EMI shielding effectiveness(EMI SE)elevates to 41.0 dB(8.2–12.4 GHz);After the introduction of MoS_(2)into binary MXene/ANF(mass ratio of 60:40),the strain to failure increases from 18.3±1.9%to 28.1±0.7%(~53.5%),the SE_(R)decreases~22.2%,and the corresponding EMI SE is 43.9 *** MoS_(2)also leads to a more efficient photothermal conversion performance(~45 to~55℃).Additionally,MXene/ANF–MoS_(2)composite films exhibit excellent electric heating performance,quick temperature elevation(15 s),excellent cycle stability(2,2.5,and 3 V),and long-term stability(2520 s).Combining with excellent mechanical performance with high MXene content,electric heating performance,and photothermal conversion performance,EMI shielding ternary MXene/ANF–MoS_(2)composite films could be applied in many industrial *** work broadens how to achieve a balance between mechanical properties and versatility of composites in the case of high-function fillers.

关键词： MXene-MoS_(2) Lubrication toughening EMI shielding Photothermal conversion Electric heating performance

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双针-板结构脉冲气泡放电等离子体固氮研究

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原子与分子物理学报 2025年第6期42卷 122-128页

作者：赵少伟张丽方志南京工业大学电气工程与控制科学学院南京211816

大气压低温等离子体可以利用空气直接进行氧化固氮,具有反应条件温和、参数灵活可控、避免温室气体排放等优点.本文利用双针-板电极在水中形成气泡放电等离子体,以空气为放电气体进行了固氮研究,分析了产物浓度和固氮能耗的影响因素.研... 详细信息

大气压低温等离子体可以利用空气直接进行氧化固氮,具有反应条件温和、参数灵活可控、避免温室气体排放等优点.本文利用双针-板电极在水中形成气泡放电等离子体,以空气为放电气体进行了固氮研究,分析了产物浓度和固氮能耗的影响因素.研究结果表明,等离子体中含有丰富的氮原子、氧原子、氢原子、激发态氮分子等活性物种,可高效合成硝态含氮产物.研究发现,脉冲参数、电极间隙、工作气体组分对气泡放电等离子体的固氮性能有重要影响.装置最高NO~-_x合成速率为19.2μmol/min,最小能耗约为11 mj/mol.此外还发现,电极间隙为6 mm时,固氮性能最优;空气中增加适量氧气(氧气/氮气比例为0.4)可以增强产物合成,降低能耗.

关键词：低温等离子体纳秒脉冲放电气液放电固氮

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Synthesis, UV-curing Behavior and Surface Properties of Fluorinecontaining Vinyl Ether Polymers

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Chinese Journal of Polymer Science 2014年第8期32卷 1032-1039页

作者： wei Li 邹应全 College of Chemistry Beijing Normal University

Five fluorine-containing vinyl ether monomers were prepared by the reaction between 2-vinyloxy ethanol, a fluorinated alcohol and hexafluorobenzene in the presence of sodium hydride in dimethylformamide. Two representative properties of these monomers, UV-curing behavior initiated by a cationic photo-initiator PAG 201 and surface free energy of coating films, were investigated. Photo-polymerization proceeded both rapidly and completely with a high double-bond conversion （〉 90%） and a fast curing rate （maximum curing time 〈 21 s） for three monomers. The surface energies of the monomers and the resulting polymer films were then investigated. The minimum surface free energy of the UV-cured homopolymer films reaches 7.1 mj/m2. X-ray photoelectron spectroscopy data show that the low surthce tension is influenced by fluorine content in the soft segments and fluorinated chains＇ migration to the surface. The five monomers exhibit low viscosity, low surface energy, good thermal stability and good photo-polymerization properties, which make them great candidates for UV coating and photoresist applications.

关键词： Fluorine-containing vinyl ether Photo-initiated polymerization Hydrophobic films Low surface energy.

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High Gain Lateral Semi-Insulating GaAs Photoconductive Switch Triggered by 1064nm Laser Pulses

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Chinese Physics Letters 2002年第3期19卷 351-354页

作者： Shi wei Zhang Xian-Bin Li Qi Chen Er-Zhu Zhao wei Department of Applied Physics Xi'an University of Technology Xi'an 710048 State Key Laboratory of Transient Optics and Technology Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi'an 710068

We report on the experimental results of a lateral semi-insulating GaAs photoconductive switch, with a gap of 8mm between two electrodes, triggered by 1064nm laser pulses at a wavelength beyond the GaAs absorption edge. Both the linear and nonlinear modes of the switch were observed when it was triggered by light pulses with an energy of 1.9mj and a pulse width of 60ns, and operated at high voltages of 3 and 5kV. The results show that when the semi-insulating GaAs photoconductive switch operates under an electrical field of 4.37kV/cm, it will enter into the linear mode first, and then the switch will undergo the nonlinear mode (lock-on) after a delay of about 20-100ns. It is worth noticing that the delay time under high light energy is longer than that in the low optical energy. The non-intrinsic absorption mechanism is discussed. EL2 deep level defects and double-photon absorption in GaAs may play a key part in the absorption process.

关键词： Gallium arsenide

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Synergistic Optimization of Toughness and EMI Shielding Properties in Rigid Polyurethane Composites by Designing Ring Structures on the Surface of Carbon Fibers

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Chinese Journal of Polymer Science 2023年第12期41卷 1958-1968,I0010页

作者： Yi-Long Zhou wei-wei Li Hui-Xin Liu Kai-Yuan Pei Shi-Ting Li School of Materials Science and Chemical Engineering Ningbo UniversityNingbo 315211China

How to achieve both toughness and enhanced electromagnetic interference shielding effectiveness(EMI SE)of carbon fibers(CFs)reinforced rigid polyurethane(RPU)composites is a significative challenge at *** this work,a ring-shaped zinc coating was deposited on the short CFs by electrodeposition *** is expected to improve the interfacial properties between the fibers and the resin matrix as well as enhance the EMI shielding properties of the composites by changing the surface morphology and roughness of the *** showed that the surface free energy of the ring-shaped zinc modified carbon fibers(RS-CFs)increased from 49.0 mj/m^(2) to 53.2 mj/m^(2),indicating that the surface roughness and wettability of the CFs were effectively *** comparison with the pristine short carbon fibers/rigid polyurethane(CFs/RPU)composites,tensile strength and tensile toughness of RS-CFs modified composites were increased by 27.1% and 121.4%,*** addition,the bending and impact strengths of RS-CFs reinforced RPU composites were also ***,the electrical conductivity of RS-CFs/RPU composites reached 1.2×10^(-5) S/m,which was much higher than that of CFs/RPU composites at 1.4×10^(-10) S/***,the EMI SE of the modified composites reached 22 dB,which was 152.9% higher than that of CFs/RPU *** enhanced electrical conductivity and EMI shielding properties of the composites could be attributed to the synergistic effect of the porous structure in the RPU matrix and the CFs modified by the metal coating.

关键词： Carbon fiber Surface decoration Rigid polyurethane Mechanical properties EMI shielding

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Estimation on Magnetic Refrigeration Material (Gd_(1-x)RE_x)_5Si_4 (RE=Dy,Ho)

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Journal of Materials Science & Technology 2006年第6期22卷 839-842页

作者： wei WU Zai FENG Lijun GUO School of Materials Science and Engineering Xihua Univiersity Chengdu 610039 China

A systematic （Gd1-xREx）sSi4 （RE=Dy, Ho） alloys are investigated to estimate their magnetocaloric effect. The Curie points of （Gd1-xREx）Si4 alloys can tunable from 266 K to 336 K when RE=Dy, Ho; z=0N0.35 and 0-0.15, respectively, and decrease nearly linearly with increasing x. These alloys keep orthorhombic structures GesSm4 and exhibit second order transition when they experience in a change magnetic field at about Curie points. The weight and voluminal magnetic entropy changes are about 3.5 J/（kg.K） and 23-29 mj/（cm^3.K） when magnetic field changes 0-2 T. The adiabatic temperatures changes （△Tad） of these alloys at Curie points are larger than 1 K in a field change 0-1.4 T, the curve of ATad is wide as that of Gd. The relative cooling power is about 0.8-0.9 J/cm^3 when field changes 0-2 T, 55% of that of Gd. Comparing with Gds（Si1-xGex）4, these alloys do not contain expensive element Ge, so that their cost are lower than the former. Because they could work at temperature region 260-340 K due to their Curie points can be tuned, which is an advantage comparing with Gd, these alloys are potential magnetic refrigerants working in a magnetic refrigerator with a low magnetic field at room temperatures.

关键词： Magnetocaloric effect Magnetic refrigerators Magnetic entropy changes Adiabatic temperature changes Rare earths

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Safety assessment of approximate segregated parallel operation on closely spaced parallel runways

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Chinese Journal of Aeronautics 2019年第2期32卷 463-476页

作者： Fei LIU Xinze LIU Mingjiang MOU Zhiqiang wei Air Traffic Management College Civil Aviation University of China

With the continuous growth of air traffic flow, some airports in China or other countries begin to construct Closely Spaced Parallel Runways(CSPR) to meet the capacity requirement of civil aviation. In this paper, the simulation and calculation method of flight trajectory is developed,as well as the collision risk calculation method and wake vortex encounter risk calculation *** methods for departure and go-around procedures are proposed to achieve approximate segregated parallel operation in an attempt to obtain approximately the same results on closely spaced parallel runways as on widely spaced parallel runways. By comparing with the independent parallel departure and segregated parallel operation in ICAO Doc. 9643, it is found that the lateral separation between aircraft in this proposal is not less than the separations in the other two cases. Based on the simulation calculation of flight trajectories under different conditions, the probabilities of collision conflict and encountering wake vortex are lower than those in current operation *** proposed plan has no special requirements in pilot operation, control command procedures,airport facilities, or meteorological observation and prediction, so it is convenient to promote and implement at the airports with closely spaced parallel runways.

关键词： Air traffic control Air transportation Closely spaced parallel runways Segregated parallel operation Wake vortex encounter Wake vortex separation standards

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Sequential use of ultraviolet light and chlorine for reclaimed water disinfection

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Journal of Environmental Sciences 2011年第10期23卷 1605-1610页

作者： Xiujuan Wang Xuexiang Hu Chun Hu Dongbin wei State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Several disinfection processes of ultraviolet （UV）, chlorine or UV followed by chlorine were investigated in municipal wastewater according to the inactivation of Escherichia coli, Shigella dysenteriae and toxicity formation. The UV inactivation of the tested pathogenic bacteria was not affected by the quality of water. It was found that the inactivated bacteria were obviously reactivated after one day in dark. Fluorescent light irradiation increased the bacteria repair. The increase of UV dosage could cause more damage to bacteria to inhibit bacteria self-repair. No photoreactivation was detected when the UV dose was up to 80 mj/cm2 for E. coli DH5ct, and 23 mj/cm2 for S. dysenteriae. Nevertheless, sequential use of 8 mj/cm2 of UV and low concentration of chlorine （1.5 mg/L） could effectively inhibit the photoreactivation and inactivate E. coli below the detection limits within seven days. Compared to chlorination alone, the sequential disinfection decreased the genotoxicity of treated wastewater, especially for the sample with high NH3-N concentration.

关键词： chlorine disinfection sequential disinfection UV disinfection photoreactivation genotoxicity wastewater reclamation

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Effects of Dietary Soy Isoflavones on Feed Intake,Growth Performance and Digestibility in Juvenile Japanese Flounder(Paralichthys olivaceus)

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Journal of Ocean University of China 2012年第4期11卷 511-516页

作者： MAI Kangsen ZHANG Yanjiao CHEN wei XU wei AI Qinghui ZHANG Wenbing Key Laboratory of Aquaculture Nutrition and Feed Ministry of Agricultureand the Key Laboratory of MaricultureMinistry of EducationOcean University of ChinaQingdao 266003P.R.China

An 8-week feeding trial was conducted to investigate the effects of dietary soy isoflavones on feeding intake,growth performance,and digestion of juvenile Japanese flounder(Paralichthys olivaceus).Four isonitrogenous(49% crude protein) and isoenergetic(20.1 mj kg-1) diets were formulated to contain four graded levels of soy isoflavones,namely,0,1,4 and 8 g soy isoflavones in 1 kg of *** diet was randomly fed to triplicate tanks of fish(Initial average weight:2.58 g ± 0.01 g),and each tank was stocked with 35 *** significant difference was observed among diets with levels of 0,1 and 4 g kg-1 soy isoflavones in feed intake,weight gain,feed efficiency ratio(FER),proximate composition of fish whole body and apparent digestibility coefficients(ADC) of nutrients and energy(P>0.05).However,high dietary soy isoflavones level(8 g kg-1) significantly depressed weight gain,FER,whole-body crude lipid content of fish and ADC of nutrients(P<0.05).These results indicate that high level of dietary soy isoflavones(above 4 g kg-1) significantly depresses growth responses and FER of Japanese ***,as the content of soy isoflavones in soybean meal is around 1 to 3 g kg-1,the adverse effects might be neglected when soybean products are used as a fish feed ingredient.

关键词： soy isoflavones feed intake digestibility growth Japanese flounder

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