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| 1 | Elemental composition and risk assessment of heavy metals in the PM10 fractions of road dust and roadside soil显示文摘A total of 64 dust samples were analyzed to determine the size distribution and elemental composition of the PM10 fraction, including42 road dust(RD), 12 roadside soil(RSD), and 10 park road dust(PRD) samples. The mass of dust smaller than 20μm was dominated by particles sized 2.5-16 μm, which accounted for 85%, 88%, and 87% of the RD, PRD, and RSD, respectively. Additionally, crustal elements accounted for 30.14%, 36.35%, and 37.14% of the PMio fractions of the RD, RSD, and PRD, respectively. The most abundant trace elements in RD, RSD, and PRD were Zn, Mn, and Cu (range, 277 to 874 mg/kg). Moreover, the /geo values revealed all dusts were contaminated with Pb, Zn, Cu, Sb, Sn, and Cd. Health risk assessment showed that Mn, Ni, Cu, Zn, Cd, Sb, and Pb in the PM10 fraction of three types of dusts posed non-cancer risks to children but posed no non-cancer risk to adults. Additionally, As, Ni, and Cd posed no cancer risk to inhabitants. | Jing Zhang Lin Wu Yanjie Zhang Fenghua Li Xiaozhen Fang Hongjun Mao | 2019 | Particuology2019，17，3： | 4 |
| 2 | Trends and abrupt changes in surface vapor content over Tarim Basin during the last 50 years显示文摘The surface vapor content has a close correlation with the generation of precipitation. Based on the atmospheric circulation data and surface vapor content data from 37 weather stations across the Tarim Basin during 1961 2010, the paper analyzed the vapor variation trend, period, abrupt changes and their causes. The results show that the increase trend of surface vapor content over the Tarim Basin mostly conforms with the average trend coefficient of 0.48. There were 3 centers displaying a trend of high vapor increase and 3 centers displaying a low vapor increase. These centers were distributed in strips and blocks across the basin from northeast to southwest. Notable inter-decadal variations in annual and seasonal vapor contents occurred in the Tarim Basin during the 50 years of the study period, with more vapor after the mid-1980s and less vapor in the 1960s and the 1970s. The significant increase in vapor content in the 50 year period occurred mostly in the 1980s and the 1990s. The increasing trend across the four seasons was strongest in summer, reaching 0.43, and weakest in spring. Great variations existed between the spring trend and the annual, summer, autumn and winter trends. During the 50-year study period, there are distinguishable periods of 4-6 years and 8-10 years in which the annual and seasonal vapor contents varied alternately between low and high concentrations. The annual vapor content and that of the four individual seasons all changed abruptly in about the mid-1980s (α<0.05). The west wind circulation, Tibetan Plateau circulation and the annual mean temperatures of the Tarim Basin are the main factors that influenced the surface vapor content over the study area, of which the Tibetan Plateau circulation may be the most important one. | HongJun LI WeiYi MAO Yong ZHAO MinZhong WANG Wen HUO | 2012 | Journal of Arid Land2012，4，3： | 3 |
| 3 | Study on the surface cracking in hot-rolled plates of Fe-23Mn-2Al-V austenitic steel显示文摘The study introduces the chemical composition,mechanical properties,physical properties and production processes of the Fe-23Mn-2Al-V austenitic steel.Investigations were made into the formation of cracks in the hot-rolled Fe-23Mn-2Al-V steel plates,with optical microscopy (OM),scanning electron microscopy (SEM) and energy dispersive spectrum (EDS).The results have shown that intergranular oxidation in the reheating furnace is the main cause of the cracks on the surface of the hot-rolled steel plates.The surface cracking can be largely avoided by controlling the remaining oxygen content in the reheating furnace and improving continuous casting (CC) processes to increase the thickness of fine equiaxed grain layer of the steel slabs. | LIAO Hongjun MAO Zhengdong WANG Lintao ZHU Jun LI Yuan ZHANG Heng | 2011 | Baosteel Technical Research2011，5，1： | 2 |
| 4 | Impacts of methanol fuel on vehicular emissions:A review显示文摘The transport sector is a significant energy consumer and a major contributor to urban air pollution.At present,the substitution of cleaner fuel is one feasible way to deal with the growing energy demand and environmental pollution.Methanol has been recognized as a good alternative to gasoline due to its good combustion performance.In the past decades,many studies have investigated exhaust emissions using methanol-gasoline blends.However,the conclusions derived from different studies vary significantly,and the explanations for the effects of methanol blending on exhaust emissions are also inconsistent.This review summarizes the characteristics of CO,HC,NO_(x),CO_(2),and particulate emissions from methanol-gasoline blended fuels and pure methanol fuel.CO,HC,CO_(2),particle mass(PM),and particle number(PN)emissions decrease when methanol-blended fuel is used in place of gasoline fuel.NO_(x) emission either decreases or increases depending on the test conditions,i.e.,methanol content.Furthermore,this review synthesizes the mechanisms by which methanol-blended fuel influences pollutant emissions.This review provides insight into the pollutant emissions from methanol-blended fuel,which will aid policymakers in making energy strategy decisions that take urban air pollution,climate change,and energy security into account. | Chung Song Ho Jianfei Peng UnHyok Yun Qijun Zhang Hongjun Mao | 2022 | Frontiers of Environmental Science & Engineering2022，16，9： | 1 |
| 5 | Brake wear-derived particles:Single-particle mass spectral signatures and real-world emissions显示文摘Brake wear is an important but unregulated vehicle-related source of atmospheric particulate matter(PM).The single-particle spectral fingerprints of brake wear particles(BWPs)provide essential information for understanding their formation mechanism and atmospheric contributions.Herein,we obtained the single-particle mass spectra of BWPs by combining a brake dynamometer with an online single particle aerosol mass spectrometer and quantified real-world BWP emissions through a tunnel observation in Tianjin,China.The pure BWPs mainly include three distinct types of particles,namely,Bacontaining particles,mineral particles,and carbon-containing particles,accounting for 44.2%,43.4%,and 10.3%of the total BWP number concentration,respectively.The diversified mass spectra indicate complex BWP formation pathways,such as mechanical,phase transition,and chemical processes.Notably,the mass spectra of Ba-containing particles are unique,which allows them to serve as an excellent indicator for estimating ambient BWP concentrations.By evaluating this indicator,we find that approximately 4.0%of the PM in the tunnel could be attributable to brake wear;the real-world fleet-average emission factor of 0.28 mg km1 veh1 is consistent with the estimation obtained using the receptor model.The results presented herein can be used to inform assessments of the environmental and health impacts of BWPs to formulate effective emissions control policies. | Jiayuan Liu Jianfei Peng Zhengyu Men Tiange Fang Jinsheng Zhang Zhuofei Du Qijun Zhang Ting Wang Lin Wu Hongjun Mao | 2023 | Environmental Science and Ecotechnology2023，，3： | 0 |
| 6 | Influence of Exposure Pathways on Tissue Distribution and Health Impact of Polycyclic Aromatic Hydrocarbon Derivatives显示文摘The oxygen(OPAHs),nitro(NPAHs),hydroxyl(OH-PAHs),and alkylated(APAHs)derivatives of polycyclic aromatic hydrocarbon(PAHs)are ubiquitous pollutants in the environment.The concentrations of NPAHs,OPAHs,OH-PAHs,and APAHs are lower than that of PAHs in the environment,but the carcinogenic abilities of the derivatives are usually 10 to 1,000-fold higher than that of parent PAHs.There are three main pathways for the exposure of polycyclic aromatic compounds to humans,including inhalation,direct contact,and ingestion.After exposure by inhalation,they are mainly distributed in the lungs,affecting lung function and causing inflammation,asthma,etc.Due to the digestive system’s strong capacity for metabolism,intake of PAHs and the derivatives is primarily distributed in the digestive system and metabolized there.And it may lead to dysplasia of these organs and even to cancer.The skin is the primary site of direct contact with PAH derivatives.PAH derivatives can enter the bloodstream through all three contact pathways,thereby accumulating in various organs.This study aimed to summarize the influence of exposure pathways on tissue distribution and the health impact of PAH derivatives to provide references for future research and evaluation on public health. | Yu Zhang Qian Hu Jiaqi Fu Xinting Li Hongjun Mao Ting Wang | 2023 | Environment & Health2023，1，3： | 0 |
| 7 | Identify the contribution of vehicle non-exhaust emissions:a single particle aerosol mass spectrometer test case at typical road environment显示文摘A single particle aerosol mass spectrometer(SPAMS)was used to accurately quantify the contribution of vehicle non-exhaust emissions to particulate matter at typical road environment.The PM_(2.5),black carbon,meteorological parameters and traffic flow were recorded during the test period.The daily trend for traffic flow and speed on TEDA Street showed obvious“M”and“W”characteristics.6.3 million particles were captured via the SPAMS,including 1.3 million particles with positive and negative spectral map information.Heavy Metal,High molecular Organic Carbon,Organic Carbon,Mixed Carbon,Elemental Carbon,Rich Potassium,Levo-rotation Glucose,Rich Na,SiO_(3) and other categories were analyzed.The particle number concentration measured by SPAMS showed a good linear correlation with the mass concentrations of PM_(2.5) and BC,which indicates that the particulate matter captured by the SPAMS reflects the pollution level of fine particulate matter.EC,ECOC,OC,HM and crustal dust components were found to show high values from 7:00–9:00 AM,showing that these chemical components are directly or indirectly related to vehicle emissions.Based on the PMF model,7 major factors are resolved.The relative contributions of each factor were determined:vehicle exhaust emission(44.8%),coal-fired source(14.5%),biomass combustion(12.2%),crustal dust(9.4%),ship emission(9.0%),tires wear(6.6%)and brake pads wear(3.5%).The results show that the contribution of vehicle non-exhaust to particulate matter at roadside environment is approximately 10.1%.Vehicle non-exhaust emissions are the focus of future research in the vehicle pollutant emission control field. | Qijun Zhang Jiayuan Liu Ning Wei Congbo Song Jianfei Peng Lin Wu Hongjun Mao | 2023 | Frontiers of Environmental Science & Engineering2023，17，5： | 0 |
| 8 | Wireless Self-Powered Vibration Sensor System for Intelligent Spindle Monitoring显示文摘In recent years,high-end equipment is widely used in industry and the accuracy requirements of the equipment have been risen year by year.During the machining process,the high-end equipment failure may have a great impact on the product quality.It is necessary to monitor the status of equipment and to predict fault diagnosis.At present,most of the condition monitoring devices for mechanical equipment have problems of large size,low precision and low energy utilization.A wireless self-powered intelligent spindle vibration acceleration sensor system based on piezoelectric energy harvesting is proposed.Based on rotor sensing technology,a sensor is made to mount on the tool holder and build the related circuit.Firstly,the energy management module collects the mechanical energy in the environment and converts the piezoelectric vibration energy into electric energy to provide 3.3 Vfor the subsequent circuit.The lithium battery supplies the system with additional power and monitors’the power of the energy storage circuit in real-time.Secondly,a three-axis acceleration sensor is used to collect,analyze and filter a series of signal processing operations of the vibration signal in the environment.The signal is sent to the upper computer by wireless transmission.The host computer outputs the corresponding X,Y,and Z channel waveforms and data under the condition of the spindle speed of 50∼2500 r/min with real-time monitoring.The KEIL5 platform is used to develop the system software.The small-size piezoelectric vibration sensor with high-speed,high-energy utilization,high accuracy,and easy installation is used for spindle monitoring.The experiment results show that the sensor system is available and practical. | Lei Yu Hongjun Wang Yubin Yue Shucong Liu Xiangxiang Mao Fengshou Gu | 2023 | Structural Durability & Health Monitoring2023，17，4： | 0 |
| 9 | Transferable equivariant graph neural networks for the Hamiltonians of molecules and solids显示文摘This work presents an E(3)equivariant graph neural network called HamGNN,which can fit the electronic Hamiltonian matrix of molecules and solids by a complete data-driven method.Unlike invariant models that achieve equivariance approximately through data augmentation,HamGNN employs E(3)equivariant convolutions to construct the Hamiltonian matrix,ensuring strict adherence to all equivariant constraints inherent in the physical system.In contrast to previous models with limited transferability,HamGNN demonstrates exceptional accuracy on various datasets,including QM9 molecular datasets,carbon allotropes,silicon allotropes,SiO_(2) isomers,and BixSey compounds.The trained HamGNN models exhibit accurate predictions of electronic structures for large crystals beyond the training set,including the Moirétwisted bilayer MoS2 and silicon supercells with dislocation defects,showcasing remarkable transferability and generalization capabilities.The HamGNN model,trained on small systems,can serve as an efficient alternative to density functional theory(DFT)for accurately computing the electronic structures of large systems. | Yang Zhong Hongyu Yu Mao Su Xingao Gong Hongjun Xiang | 2023 | npj Computational Materials2023，，1： | 0 |
| 10 | Densely packed overlayer of iron phthalocyanine molecules grown on single-layer graphene显示文摘The formation of densely packed overlayer of iron phthalocyanine(FePc) molecules on single-layer graphene(SLG) epitaxially grown on Ru(0001) is studied by means of low temperature scanning tunneling microscopy. We show that the FePc molecules form single molecular arrays, ordered honeycomb lattice, Kagome lattice and square lattice with increasing molecular coverage. The densely packed square lattice of the molecular layer is modulated by the moire pattern of SLG/Ru(0001). The superposition of the square lattice of the molecular layer on the hexagonal lattice of SLG moire pattern leads to the formation of a larger strip moiré pattern. This coverage-dependent self-assembling behavior of FePc on SLG/Ru(0001) is mainly driven by the inhomogeneous electronic structure of graphene moire pattern, due to spatial-dependent interfacial charge transfer between SLG and Ru(0001) substrate. | Liwei Liu Wende Xiao Jinhai Mao Haigang Zhang YuhangJiang Haitao Zhou Kai Yang Hongjun Gao | 2018 | Chinese Chemical Letters2018，29，1： | 0 |
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