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Preparation of Fe-Based Bulk Amorphous Materials and Its Application to Sensors

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Journal of Rare Earths 2004年第z1期22卷 90-92页

作者： Sun xiaohua Wu Jinbin zhao Zengqi zhao Jun Sun Guangjie Liu Changsheng School of Materials &Metallurgy Northeastern UniversityShenyang 110004 China Baotou Rare Earth Research Institute Baotou 014010 China Baotou Rare Earth Research Institute Baotou 014010 China Baotou Rare Earth Research Institute Baotou 014010 China Baotou Rare Earth Research Institute Baotou 014010 China Baotou Rare Earth Research Institute Baotou 014010 China School of Materials &MetallurgyNortheastern UniversityShenyang 110004 China

The study of recent years found that big bulk amorphous alloys were formed for some multi-element compositions at rapid cooling speed such as Zr-, La-, Fe-, Mg-based alloys with wide undercooled liquid phase field and high trend of forming glass.( ATx = crystallization temperature Tx - glass transformation temperature Tg) Bulk amorphous copper mold upper suction casting with minus pressure while some new technical processes and adding new elements such as Co, Nb, Ca, *** used to improve magnetic properties and other performances of the *** results show that Fe-based bulk amorphous alloys have low coercive force and high permeability, which are successfully applied to magnetoelectric sensors with temperature ranges between -45 ℃ and 150 ℃ by special design of magnetic circuits.

关键词： bulk amorphous glass transformation ability suction casting of minus pressure sensor

Room-temperature chlorine gas sensor based on CdSnO_(3) synthesized by hydrothermal process

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Journal of Advanced Ceramics 2013年第1期2卷 31-36页

作者： xiaohua zhao Zhenzhen LI Xiangdong LOU Meng LI Ning ZHANG School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiang 453007China

The perovskite-structure CdSnO_(3) was obtained by calcinating CdSnO_(3)·3H_(2)O precursor at 550℃,which was synthesized by hydrothermal process at 170℃for 16 *** phase and microstructure of the obtained CdSnO_(3) powders were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The CdSnO_(3) powders exhibit uniformly cubic structure with side length of about 100 *** effects of working temperature and concentration of detected gas on the gas response were *** selectivity of chlorine gas against other gases and response-recovery time of the sensor were also *** results reveal that the CdSnO_(3) gas sensor has enhanced sensing properties to 1-10 ppm chlorine gas at room temperature;the value of gas response can reach 1338.9 to 5 ppm chlorine ***,the sensor shows good selectivity and quick response behavior(23 s)to chlorine gas,indicating its application in detecting chlorine gas at room temperature in the future.

关键词： chlorine gas sensor room temperature CdSnO_(3) hydrothermal process

Synthesis,Characterization and Protonation Study of Novel Poly(thioether imide)s based on Aromatic Heterocyclic Diimide

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Journal of Wuhan University of Technology(Materials Science) 2013年第2期28卷 269-273页

作者：赵晓燕 WANG Chenyi zhao xiaohua SUN Zheng College of Petrochemical Engineering Changzhou University Changzhou Expansion New Stuff Technology Co. Ltd School of Materials Science and Engineering Changzhou University

Novel poly（thioether imide）s were synthesized by 2,5-dimercapto-l,3,4-thiadiazole, and aromatic heterocyclic chlorodiimids through nucleophilic!substitution reaction as alkali catalysts were presented. The poly（thioether imide）s exhibited good thermal property. The glass transition temperatures of polymers were around 373 ℃, and 10% weight loss temperatures were in the range of 450-500 ℃ in nitrogen/air atmosphere. Meanwhile, the chloroform dilute solutions of these polYmers could show strong UV-vis absorption peaks at about 289 nm. After being protonated by inorganic acids （HC1）, the new shoulder absorption peaks were observed at 350 nm. The PL absorption bands of polymer solutions were in the region of 350-550 nm, which showed the green-yellow fluorescence.

关键词： aromatic heterocyclic chlorodiimide thermal stability fluorescence protonation

Reduction of the vector fields preserving n-form and the study of their in terrelated problems

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Chinese Science Bulletin 1998年第9期43卷 788-789页

作者： Debin Huang xiaohua zhao Zengrong Liu Department of Mathematics Shanghai University Jiading China Department of Mathematics Yunnan University Kunming China

Evaluation of fog warning system on driving under heavy fog condition based on driving simulator

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Journal of Intelligent and Connected Vehicles 2021年第2期4卷 41-51页

作者： xiaohua zhao Xuewei Li Yufei Chen Haijian Li Yang Ding Beijing University of Technology BeijingChina and Tsinghua University State Key Laboratory of Automotive Safety and EnergyBeijingChina China Automotive Engineering Research Institute BeijingChina Beijing University of Technology BeijingChina

Purpose–Heavy fog results in low visibility,which increases the probability and severity of trafﬁc crashes,and fog warning system is conducive to the reduction of crashes by conveying warning messages to *** paper aims at exploring the effects of dynamic message sign(DMS)of fog warning system on driver ***/methodology/approach–First,a testing platform was established based on driving simulator and driver performance data under DMS were *** experiment route was consisted of three different zones(*** zone,transition zone and heavy fog zone),and mean speed,mean acceleration,mean jerk in the whole zone,ending speed in the warning zone and transition zone,maximum deceleration rate and mean speed reduction proportion in the transition zone and heavy fog zone were ***,the one-way analysis of variance was applied to test the signiﬁcant difference between the ***,drivers’subjective perception was also ***–The results indicated that DMS is beneﬁcial to reduce speed before drivers enter the heavy fog ***,when drivers enter a heavy fog zone,DMS can reduce the tension of drivers and make drivers operate more ***/value–This paper provides a comprehensive approach for evaluating the effectiveness of the warning system in adverse conditions based on the driving simulation test *** method can be extended to the evaluation of vehicle-to-infrastructure technology in other special scenarios.

关键词： Heavy fog conditions Fog warning system Dynamic message sign Driver performance Driving simulator

Influence of adverse weather on drivers’ perceived risk during car following based on driving simulations

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Journal of Modern Transportation 2019年第4期27卷 282-292页

作者： Chen Chen xiaohua zhao Hao Liu Guichao Ren Xiaoming Liu Operation Guarantee College of Metropolitan TransportationBeijing University of TechnologyBeijing 100124China Beijing Transportation Information Beijing 100161China

Adverse weather has a considerable impact on the behavior of drivers,which puts vehicles and drivers in hazardous situations that can easily cause traffic *** research examines how drivers'perceived risk changes during car following under different adverse weather conditions by using driving simulation *** expressway road scenario was built in a driving *** types of weather conditions,including clear sky,four levels of fog,four levels of rain and two levels of snow,were ***,to simulate the carfollowing behavior,three car-following situations were designed according to the motion of the lead *** car-following indicators were extracted based on risk homeostasis ***,the entropy weight method was used to integrate the selected indicators into an index to represent the drivers'perceived *** linear regression was applied to measure the influence of adverse weather conditions on perceived risk,and the coefficients were considered as *** results demonstrate that both the weather conditions and road type have significant effects on car-following ***'perceived risk tends to increase with the worsening weather *** conditions of extremely poor visibility,such as heavy dense fog,the measured drivers'perceived risk is low due to the difficulties in vehicle operation and limited visibility.

关键词： Adverse weather Driving simulation Perceived risk Entropy weight method Multiple linear regression

Mapping the knowledge domain of crash risk in older drivers studies: A scientometric analysis

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Journal of Traffic and Transportation Engineering(English Edition) 2024年

作者： Bingshuo Chen xiaohua zhao Yang Li Xiaoming Liu Beijing Key Laboratory of Traffic Engineering， College of Metropolitan Transportation， Beijing University of Technology Department of Road Traffic Management， Beijing Police College

With the rapid global progression of population aging， the traffic safety of older drivers has emerged as a worldwide concern， resulting in a significant surge in the number of manuscripts on this subject. This study employed scientometric analysis to scrutinize 1652 original manuscripts concerning research on older drivers. To visually depict the current state of knowledge in the field， Mapping Knowledge Domain (MKD) was employed for scientometric analysis， shedding light on the evolution of this research area. Firstly， a statistical analysis was conducted to scrutinize the development of research on older drivers. Secondly， VOSviewer was utilized for manuscript co-citation analysis， revealing five primary research topics: cognitive function and crash risk， visual processing impairment and crash risk， potential consequences of changes in driving patterns， involvement of older drivers in crashes， as well as identifying and enhancing factors contributing to unsafe driving. Thirdly， CitNetExplorer was applied to identify core publications and their reference relationships. Research predominantly focused on visual function， cognitive function， and physical health. Fourthly， VOSviewer’s keyword co-citation analysis pinpointed research hotspots in the last five years concerning older drivers: driving risk factors， driving fitness evaluation， impact of distraction on driving， and impact of visual impairment on driving. Finally， based on the aforementioned discussions and the situation in China， some feasible research directions are proposed. This paper summarizes the overall trends in the study of older drivers and the risk factors for traffic accidents. These findings can serve as a reference for improving the driving and road traffic safety of older drivers.

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STUDY ON A THREE DIMENSIONAL CHAOTIC SYSTEM

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Annals of Differential Equations 2006年第2期22卷 217-224页

作者： Yao Sisheng zhao xiaohua Dept. of Math. Kunming Teachers College Kunming 650031 Dept. of Math. Zhejiang Normal University Jinhua 321004

In this letter a new chaotic system is discussed. Some basic dynamic properties, such as symmetry, dissipation, continuous spectrum and chaotic behaviors of the butterfly attractor are studied. Furthermore, period-dou... 详细信息

关键词： invariant dissipation three dimensional system chaotic system

In situ polymerization of poly(3,4-ethylenedioxythiophene)protective layer towards stable zinc anode

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Nano Research 2025年第1期18卷 382-394页

作者： Debin Luo Peng Zhou Xiaowei Lv Panpan Sun xiaohua Sun Hewei zhao College of Materials and Chemical Engineering Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion MaterialsChina Three Gorges UniversityYichang 443002China Hubei Three Gorges Laboratory Yichang 443007China School of Chemistry Beihang UniversityBeijing 100191China

Aqueous zinc-ion devices are considered promising candidates for energy storage due to their high safety,low cost and relatively high energy ***,the dendrite growth,hydrogen evolution reaction(HER)and corrosion of the zinc anode significantly limit the development of Zn-ion ***,an inexpensive poly(3,4-ethylenedioxythiophene)(PEDOT)protective layer was constructed in situ on the Zn surface using electropolymerization to suppress dendrite growth and side reactions,thereby enhancing the reversibility of *** and theoretical calculations revealed that this hydrophilic protective layer promotes the desolvation process of hydrated Zn^(2+)and facilitates the transport of zinc ions,thus improving the thermodynamic and kinetic properties of Zn^(2+)deposition and inhibiting interfacial side ***,the optimized PEDOT@Zn symmetric battery exhibited a cycling stability exceeding 1250 h at 0.5 mA·cm^(-2)and 0.25 mAh·cm^(-2),with a significantly reduced overpotential(from 91.8 to 35 mV).With the assistance of the PEDOT protective layer,the PEDOT@Zn//Cu battery maintained approximately 99.5%Coulombic efficiency after 450 ***-situ scanning electron microscopy(SEM)and in situ optical microscopy characterizations further confirmed that the PEDOT protective layer can effectively suppress the growth of zinc ***,the Zn-ion capacitors assembled by the PEDOT@Zn and activated carbon also demonstrated outstanding cycling stability.

关键词： zinc-ion devices zinc anode poly(3 4-ethylenedioxythiophene)(PEDOT) dendrite desolvation process