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| 1 | Comparison of microstructures and mechanical properties of composite extruded AZ31 sheets显示文摘The microstructures and mechanical properties of the composite extruded AZ31/AZ31 and AZ31/4047 Al sheets were investigated and made a comparison to the conventional extruded AZ31 sheet.Owing to the introduced intense shear deformation at the interface during the composite extrusion,grain refinement and tilted texture were detected in AZ31 layers of the AZ31/AZ31 and AZ31/4047 Al sheets,while the conventional extruded AZ31 sheet exhibited a relative coarse,inhomogeneous microstructure and strong basal texture.The compressiontension yield ratio was increased gradually from the AZ31 to the AZ31/AZ31 and AZ31/4047 Al sheets.Besides,the AZ31/4047 Al sheet could successfully accomplish the whole bending forming process at room temperature,while the AZ31 and AZ31/AZ31 sheets were both bend-formed to failure with significant cracks in the outer tensile region under the identical bending parameters.Moreover,under the same bending strain,both the outward offset degree of strain neutral layer and the sheet thickening were more serious in the AZ31/4047 Al composite sheet than those of the AZ31 and AZ31/AZ31 sheets.The foremost reason was the quite wide gap of material properties between Mg alloy AZ31 layer(tensile loading in the outer region)and Al 4047 layer(compressive loading in the inner region). | Yanfu Chai Yan Song Bin Jiang Jie Fu Zhongtao Jiang Qingshan Yang Haoran Sheng Guangsheng Huang Dingfei Zhang Fusheng Pan | 2019 | Journal of Magnesium and Alloys2019，7，4： | 11 |
| 2 | Numerical simulation of nonlinear propagation of sound waves in a finite horn显示文摘Nonlinear acoustic propagation generated by a piston in a finite horn is numerically studied.A quasi-one-dimensional nonlinear model with varying cross-section uses high-order low-dispersion numerical schemes to solve the governing equation.Because of the nonlinear wave distortion and reflected sound waves at the mouth,broadband time-domain impedance boundary conditions are employed.The impedance approximation can be optimized to identify the complex-conjugate pole-residue pairs of the impedance functions,which can be calculated by fast and efficient recursive convolution.The numerical results agree very well with experimental data in the situations of weak nonlinear wave propagation in an exponential horn,it is shown that the model can describe the broadband characteristics caused by nonlinear distortion.Moreover,finite-amplitude acoustic propagation in types of horns is simulated,including hyperbolic,conical,exponential and sinusoidal horns.It is found that sound pressure levels at the horn mouth are strongly affected by the horn profiles,the driving velocity and frequency of the piston.The paper also discusses the influence of the horn geometry on nonlinear waveform distortion. | HOU Wei PAN Haoran SONG Weihua JING Xiaodong SUN Xiaofeng | 2015 | Chinese Journal of Acoustics2015，34，2： | 4 |
| 3 | Fabrication and abrasive wear properties of metal matrix composites reinforced with three-dimensional network structure显示文摘Reticulated polyurethane was chosen as the preceramic material for preparing the porous preform using the rep- lication process. The immersing and sintering processes were each performed twice for fabricating a high-porosity and su- per-strong skeleton. The aluminum magnesium matrix composites reinforced with three-dimensional network structure were prepared using the infiltration technique by pressure assisting and vacuum driving. Light interfacial reactions have played a profitable role in most of the ceramic-metal systems. The metal matrix composites interpenetrated with the ceramic phase have a higher wear resistance than the metal matrix phase. The volume fraction of ceramic reinforcement has a sig- nificant effect on the abrasive wear, and the wear rate can be decreased with the increase of the volume fraction of rein- forcement. | WANG Shouren GENG Haoran LI Kunshan SONG Bo WANG Yingzi HUI Linhai | 2006 | Rare Metals2006，25，6： | 2 |
| 4 | Insights Into the Interfacial Degradation of High-Voltage All-Solid-State Lithium Batteries显示文摘Poly(ethylene oxide)(PEO)-based solid polymer electrolyte(SPE)is considered as a promising solid-state electrolyte for all-solid-state lithium batteries(ASSLBs).Nevertheless,the poor interfacial stability with high-voltage cathode materials(e.g.,LiCoO_(2))restricts its application in high energy density solid-state batteries.Herein,high-voltage stable Li_(3)AlF_(6) protective layer is coated on the surface of LiCoO_(2) particle to improve the performance and investigate the failure mechanism of PEO-based ASSLBs.The phase transition unveils that chemical redox reaction occurs between the highly reactive LiCoO_(2) surface and PEO-based SPE,resulting in structure collapse of LiCoO_(2),hence the poor cycle performance of PEO-based ASSLBs with LiCoO_(2) at charging voltage of 4.2 V vs Li/Li+.By sharp contrast,no obvious structure change can be found at the surface of Li_(3)AlF_(6)-coated LiCoO_(2),and the original layered phase was well retained.When the charging voltage reaches up to 4.5 V vs Li/Li+,the intensive electrochemical decomposition of PEO-based SPE occurs,leading to the constant increase of cell impedance and directly causing the poor performance.This work not only provides important supplement to the failure mechanism of PEO-based batter-ies with LiCoO_(2),but also presents a universal strategy to retain structure stability of cathode-electrolyte interface in high-voltage ASSLBs. | Jiawen Li Yuchen Ji Haoran Song Shiming Chen Shouxiang Ding Bingkai Zhang Luyi Yang Yongli Song Feng Pan | 2022 | Nano-Micro Letters2022，14，12： | 2 |
| 5 | PM_(2.5) exposure associated with microbiota gut-brain axis:Multi-omics mechanistic implications from the BAPE study显示文摘Recent studies have shown that PM_(2.5) may activate the hypothalamus-pituitary-adrenal(HPA)axis by inducing hormonal changes,potentially explaining the increase in neurological and cardiovascular risks.In addition,an association between PM_(2.5) and gut microbiota and metabolites was established.The above evidence represents crucial parts of the gut-brain axis(GBA).In view of this evidence. | Tiantian Li Jianlong Fang Song Tang Hang Du Liang Zhao Yanwen Wang Fuchang Deng Yuanyuan Liu Yanjun Du Liangliang Cui Wanying Shi Yan Wang Jiaonan Wang Yingjian Zhang Xiaoyan Dong Ying Gao Yu Shen Li Dong Huichan Zhou Qinghua Sun Haoran Dong Xiumiao Peng Yi Zhang Meng Cao Hong Zhi Jingyang Zhou Xiaoming Shi | 2022 | The Innovation2022，3，2： | 2 |
| 6 | Metasurface empowered lithium niobate optical phased array with an enlarged field of view显示文摘Integrated optical phased arrays(OPAs) have attracted significant interest to steer laser beams for applications including free-space communications, holography, and light detection and ranging. Although many methods have been proposed to suppress grating lobes, OPAs have also been limited by the trade-off between field of view(FOV)and beamforming efficiency. Here, we propose a metasurface empowered port-selected OPA(POPA), an OPA steered by port selection, which is implemented by an aperiodic waveguide array with an average pitch less than the wavelength and phase controlled by coupling among waveguides. A metasurface layer above the POPA was designed to increase wide FOV steering, aliasing-free by polarization division. As a result, we experimentally demonstrate beam scanning over a ±41.04° × 7.06° FOV. The aliasing-free POPA with expanded FOV shows successful incorporation of the waveguide-based OPA technique with an emerging metasurface design, indicating much exploration in concepts for integrated photonic devices. | ZHIZHANG WANG WANGE SONG YUXIN CHEN BIN FANG JITAO JI HAORAN XIN SHINING ZHU TAO LI | 2022 | Photonics Research2022，10，11： | 2 |
| 7 | Temporal-spatial distributions of road silt loadings and fugitive road dust emissions in Beijing from 2019 to 2020显示文摘Road silt loading(sL)is an important parameter in the fugitive road dust(FRD)emissions.In this study,the improved Testing Re-entrained Aerosol Kinetic Emissions from Roads(TRAKER)combined with the AP-42 method was firstly developed to quickly measure and estimate the sLs of paved roads in Beijing,China.The annual average sLs in Beijing was 0.59±0.31 g/m^(2)in 2020,and decreased by 22.4%compared with that in 2019.The seasonal variations of sLs followed the order of spring>winter>summer>autumn in the two years.The seasonal mean road sLs on the same type road in the four seasons presented a decline trend from^(2)019 to 2020,especially on the Expressway,decreasing 47.4%-72.7%.The road sLs on the different type roads in the same season followed the order of Major arterial∼Minor arterial∼Branch road>Express road,and Township road∼Country highway>Provincial highway∼National highway.The emission intensities of PM10 and PM_(2.5)from FRD in Beijing in 2020 were lower than those in 2019.The PM10 and PM_(2.5)emission intensities at the four planning areas in the two years all presented the order of the capital functional core area>the urban functional expansion area>the urban development new area>the ecological conservation and development area.The annual emissions of PM10 and PM_(2.5)from FRD in Beijing in 2020 were 74,886 ton and 18,118 ton,respectively,decreasing by∼33.3%compared with those in 2019. | Haibin Wang Lihui Han Tingting Li Song Qu Yuncheng Zhao Shoubin Fan Tong Chen Haoran Cui Junfang Liu | 2023 | Journal of Environmental Sciences2023，，10： | 1 |
| 8 | Porous fixed-bed photoreactor for boosting C-C coupling in photocatalytic CO_(2)reduction显示文摘Solar-driven CO_(2)conversion to chemical fuels in an aqueous solution is restricted not only by photocatalysts but also by mass transfer.Here,a regulatable three-phase interface on a porous fixed-bed is constructed for efficient C-C coupling in photocatalytic CO_(2)reduction.The photocatalytic results show that∼90%selectivity towards C^(2+)products is obtained by a Cu/Cd_(0.5)Zn_(0.5)S photocatalyst,with a yield of 6.54μmol/h(an irradiation area of 0.785 cm^(2)),while only 0.94μmol/h(an irradiation area of 19.625 cm^(2))is achieved with a commonly used suspension photocatalytic reactor.We find that under the same CO_(2)feed rate,the local CO_(2)concentration in this porous fixed-bed photoreactor is obviously higher than in the suspension photoreactor.The larger local CO_(2)coverage derived from a higher CO_(2)supply and aggregation enhances the C-C coupling,thereby generating more C^(2+).Even an observable three-phase interface on the porous fixed-bed can be regulated by adjusting the CO_(2)supply,for which the optimal gas inlet rate is 5-10 sccm. | Shengjie Bai Haoran Qiu Mengmeng Song Guiwei He Feng Wang Liejin Guo | 2022 | eScience2022，2，4： | 1 |
| 9 | Thermo-kinetic connectivity by integrating thermo-kinetic correlation and generalized stability显示文摘Designing structured materials with optimized mechanical properties generally focuses on engineering microstructures,which are closely determined by the processing routes,such as phase transformations(PTs)and plastic deformations(PDs).Both PTs and PDs follow inherent trade-off relation between thermodynamic driving force ΔG and kinetic energy barrier Q,i.e.,so-called thermo-kinetic correlation.By analyzing nucleation and growth and proposing a conception of negative driving force integrating strain energy,interface energy and any kind of energy that equivalently inhibits the PT itself,ΔG^(S),unified expressions for the thermo-kinetic correlation and generalized stability(GS)were derived for three kinds of PTs,i.e.,diffusive PTs with simultaneously decreasedΔG and increased Q,diffusive PTs with simultaneously increasedΔG and decreased Q,and displacive PTs with simultaneously increased ΔG and decreased Q.This leads to so-called thermo-kinetic connectivity by integrating the thermo-kinetic correlation and the GS,where,by application in typical PTs,it was clearly shown,a criterion of high ΔG-high GS can be predicted by modulating chemical driving force,negative driving force and kinetic energy barrier for diffusion or nucleation.Following thermo-kinetic connectivity,analogous procedure for dislocation evolution upon PDs was performed,and materials design in terms of the highΔG-high GS criterion was discussed and prospected. | Yuqing He Shaojie Song Jinglian Du Haoran Peng Zhigang Ding Huaiyu Hou Linke Huang Yongchang Liu Feng Liu | 2022 | Journal of Materials Science & Technology2022，，32： | 1 |
| 10 | Miniaturization of mechanical actuators in skin-integrated electronics for haptic interfaces显示文摘Skin-integrated electronics,also known as electronic skin(e-skin);are rapidly developing and are gradually being adopted in biomedical fields as well as in our daily lives.E-skin capable of providing sensitive and high-resolution tactile sensations and haptic feedback to the human body would open a new e-skin paradigm for closed-loop human-machine interfaces.Here,we report a class of materials and mechanical designs for the miniaturization of mechanical actuators and strategies for their integration into thin,soft e-skin for haptic interfaces.The mechanical actuators exhibit small dimensions of 5 mm diameter and 1.45 mm thickness and work in an electromagnetically driven vibrotactile mode with resonance frequency overlapping the most sensitive frequency of human skin.Nine mini actuators can be integrated simultaneously in a small area of 2 cm×2 cm to form a 3×3 haptic feedback array,which is small and compact enough to mount on a thumb tip.Furthermore,the thin,soft haptic interface exhibits good mechanical properties that work properly during stretching,bending,and twisting and therefore can conformally fit onto various parts of the human body to afford programmable tactile enhancement and Braille recognition with an accuracy rate over 85%. | Dengfeng Li Jiahui He Zhen Song Kuanming Yao Mengge Wu Haoran Fu Yiming Liu Zhan Gao Jingkun Zhou Lei Wei Zhengyou Zhang Yuan Dai Zhaoqian Xie Xinge Yu | 2021 | Microsystems & Nanoengineering2021，7，5： | 1 |
| 11 | Plasma from healthy donors protects blood-brain barrier integrity via FGF21 and improves the recovery in a mouse model of cerebral ischaemia显示文摘Background Healthy plasma therapy reverses cognitive deficits and promotes neuroplasticity in ageing brain disease.However,whether healthy plasma therapy improve blood-brain barrier integrity after stroke remains unknown.Methods Here,we intravenously injected healthy female mouse plasma into adult female ischaemic stroke C57BL/6 mouse induced by 90 min transient middle cerebral artery occlusion for eight consecutive days.Infarct volume,brain atrophy and neurobehavioural tests were examined to assess the outcomes of plasma treatment.Cell apoptosis,blood-brain barrier integrity and fibroblast growth factor 21 knockout mice were used to explore the underlying mechanism.Results Plasma injection improved neurobehavioural recovery and decreased infarct volume,brain oedema and atrophy after stroke.Immunostaining showed that the number of transferase dUTP nick end labelling+/NeuN+cells decreased in the plasma-injected group.Meanwhile,plasma injection reduced ZO-1,occluding and claudin-5 tight junction gap formation and IgG extravasation at 3 days after ischaemic stroke.Western blot results showed that the FGF21 expression increased in the plasma-injected mice.However,using FGF21 knockout mouse plasma injecting to the ischaemic wild-type mice diminished the neuroprotective effects.Conclusions Our study demonstrated that healthy adult plasma treatment protected the structural and functional integrity of blood-brain barrier,reduced neuronal apoptosis and improved functional recovery via FGF21,opening a new avenue for ischaemic stroke therapy. | Muyassar Mamtilahun Lu Jiang Yaying Song Xiaojing Shi Chang Liu Yixu Jiang Lidong Deng Haoran Zheng Hui Shen Yongfang Li Zhijun Zhang Yongting Wang Yaohui Tang Guo-Yuan Yang | 2021 | Stroke & Vascular Neurology2021，6，4： | 1 |
| 12 | A scalable fish-school inspired self-assembled particle system for solar-powered water-solute separation显示文摘Complete separation of water and solute is the ultimate goal of water treatment,for maximized resource recycling.However,commercialized approaches such as evaporative crystallizers consume a large amount of electricity with a significant carbon footprint,leading to calls for alternative energy-efficient and eco-friendly strategies.Here,inspired by schooling fish,we demonstrate a collective system self-assembled by expanded polystyrene(EPS)-core/graphene oxide(GO)-shell particles,which enables autonomous,efficient and complete water-solute separation powered by sunlight.By taking advantage of surface tension,these tailored particles school together naturally and are bonded as a system to function collectively and coordinatively,to nucleate,grow and output salt crystals continuously and automatically out of even saturated brine,to complete water-solute separation.Solar-vapor conversion efficiency over 90%and salt production rate as high as 0.39 kg m^(-2) h^(-1) are achieved under 1-sun illumination for this system.It reduces the carbon footprint of~50 kg for treating 1-ton saturated brine compared with the commercialized approaches. | Ning Xu Haoran Zhang Zhenhui Lin Jinlei Li Guoliang Liu Xiuqiang Li Wei Zhao Xinzhe Min Pengcheng Yao Lin Zhou Yan Song Bin Zhu Shining Zhu Jia Zhu | 2021 | National Science Review2021，8，10： | 1 |
| 13 | The rice histone methylation regulates hub species of the root microbiota显示文摘Plants have a close relationship with their root microbiota,which comprises a complex microbial network.Histone methylation is an important epigenetic modification influencing multiple plant traits;however,little is known about the role of plant histone methylation in the assembly and network structure of the root microbiota.In this study,we established that the rice(Oryza sativa)histone methylation regulates the structure and composition of the root microbiota,especially the hub species in the microbial network.DJjmj703(defective in histone H3K4 demethylation)and ZH11-sdg714(defective in H3K9 methylation)showed significant different root microbiota compared with the corresponding wild types at the phylum and family levels,with a consistent increase in the abundance of Betaproteobacteria and a decrease in the Firmicutes.In the root microbial network,35 of 44 hub species in the top 10 modules in the tested field were regulated by at least one histone methylation-related gene.These observations establish that the rice histone methylation plays a pivotal role in regulating the assembly of the root microbiota,providing insights into the links between plant epigenetic regulation and root microbiota. | Zhiyao Lv Rui Dai Haoran Xu Yongxin Liu Bo Bai Ying Meng Haiyan Li Xiaofeng Cao Yang Bai Xianwei Song Jingying Zhang | 2021 | Journal of Genetics and Genomics2021，48，9： | 1 |
| 14 | A Supported Palladium on Gallium-based Liquid Metal Catalyst for Enhanced Oxygen Reduction Reaction显示文摘Developing high-performance catalysts for oxygen reduction reaction to replace costly platinum-based materials is of great importance but still confronted with challenges.Herein,a kind of supported palladium liquid metal catalyst,which is prepared by galvanic replacement,surpasses commercial Pt/C and Pd/C in oxygen reduction catalysis with a higher half-wave potential of 0.92 V,mass activity of 1.85 A/mgPd at 0.90 V,and superior durability.The liquid metal support can both optimize the electronic structures of Pd sites and guarantee the dispersion of Pd atoms,which explains the enhanced activity and durability,respectively.This work opens an avenue for rational design of catalysts. | MA Chunrong SONG Bingyi MA Zhentao WANG Xiaoqian TIAN Lin ZHANG Haoran CHEN Cai ZHENG Xusheng YANG Li-ming WU Yuen | 2022 | Chemical Research in Chinese Universities2022，38，5： | 0 |
| 15 | Cu_(2+1)O/CuO_(x)heterostructures promote the electrosynthesis of C^(2+)products from CO_(2)显示文摘Manipulating the oxidation state of Cu catalysts can significantly affect the selectivity and activity of electrocatalytic carbon dioxide reduction(CO_(2)RR).However,the thermodynamically favorable cathodic reduction to metallic states typically leads to catalytic deactivation.Herein,a defect construction strategy is employed to prepare crystalline/amorphous Cu_(2+1)O/CuO_(x)heterostructures(c/a-CuO_(x))with abundant Cu0 and Cuδ+(0<δ<1)sites for CO_(2)RR.The C^(2+)Faradaic efficiency of the heterostructured Cu catalyst is up to 81.3%,with partial current densities of 406.7 mA·cm−2.Significantly,real-time monitoring of the Cu oxidation state evolution by in-situ Raman spectroscopy confirms the stability of Cuδ+species under long-term high current density operation.Density functional theory(DFT)calculations further reveal that the adjacent Cu0 and Cuδ+sites in heterostructured c/a-CuO_(x)can efficiently reduce the energy barrier of CO coupling for C^(2+)products. | Rongbo Sun Cong Wei Zixiang Huang Shuwen Niu Xiao Han Cai Chen Haoran Wang Jia Song Jun-Dong Yi Geng Wu Dewei Rao Xusheng Zheng Yuen Wu Gongming Wang Xun Hong | 2023 | Nano Research2023，16，4： | 0 |
| 16 | Computational Fluid Dynamics Analysis of Upper Airway Changes after Protraction Headgear and Rapid Maxillary Expansion Treatment显示文摘Clinically,it is common for Class III patients with maxillary skeletal deficiency,which may result in a variety of adverse consequences.Protraction headgear and rapid maxillary expansion(PE)is an effective treatment,but its effect on upper airway hydrodynamics has not been reported.The main purpose of this study was to evaluate the changes of the flow in the upper airway after PE by computational fluid dynamics(CFD).The sample includes fifteen patients(6 males,9 females,age 11.00±1.00)and the paired T-test was used to analyze the differences between the measured data before and after treatment.The maximum flow velocity decreased from 8.42±0.16 m/s to 6.98±0.36 m/s(p<0.05),and the maximum shear force decreased from 3.72±1.48 Pa to 2.13±0.18 Pa.The maximum negative pressure decreased from−101.78±33.60 Pa to 58.15±9.16 Pa,only the changes of velopharynx and glossopharynx were statistically significant;while the maximum resistance decreased from 140.88±68.68 Pa/mL/s to 45.95±22.96 Pa/mL/s.PE can effectively reduce the airflow resistance of the upper airway and the probability of airway collapse,thus improving the patient’s ventilation function. | Haoran Xu Shuai Chen Xue Song Jingying Wang | 2023 | Molecular & Cellular Biomechanics2023，20，1： | 0 |
| 17 | Comprehensive zoning of biomass energy heating in EU countries reference for China from European experience显示文摘Heat is the largest energy end-use in the world,accounting for about 50%of global final energy consumption.In 2019,the International Energy Agency pointed out that the development of renewable energy heating has become a key way for the global response to climate change,environmental pollution control,energy transformation and sustainable development.Biomass energy as a priority for the development of renewable heat sources has been valued by countries around the world.Developed earlier in the EU countries,their biomass heating technology is more mature,and their policy system is more comprehensive.Accounting for 86%of the total renewable thermal energy consumption,biothermal energy in these countries has achieved significant effect and become an important driving force for the decarbonization of the heating industry.This practice has a very high demonstration effect globally.This paper constructs a comprehensive zoning theoretical framework of biomass energy heating and utilization in the EU countries.Based on the calculation of the supply and demand potential of biomass energy heating system,the FCM method is used to quantify the status of biomass resource utilization in 28 EU countries.The results show that there are significant differences in the utilization of biomass energy heating in the EU countries,which can be divided into five categories of comprehensive zones,which are the key development category(Finland,Sweden,Denmark,Estonia,Lithuania and Latvia),resource priority category(Austria,Croatia,Bulgaria,Romania,and Slovenia),policy-oriented category(Germany,Italy,Portugal,and Cyprus),good-potential category(Czech Republic,Hungary,Greece,Spain,Poland,France,and Slovakia)and under-developed category(UK,Netherlands,Belgium,Ireland,Luxembourg and Malta).At the same time,this paper discusses the characteristics and causes of biomass heating utilization of different types of EU countries,and summarizes the mature heating systems and rich experience in the EU countries with China’s current heating situation and its future challenges concerning renewable energy development.Finally,this study provides some implications for China’s clean heating development,energy efficient use,energy supply security and energy structure upgrade. | Chenchen Song Jijiang He Haoran Zhang | 2021 | Chinese Journal of Population,Resources and Environment2021，19，4： | 0 |
| 18 | Assessment on gas-polyethylene terephthalate solid interface partial discharge properties of C4F7N/CO_(2)gas mixture for eco-friendly gas insulating transformer显示文摘The eco-friendly insulating gas perfluoroisobutyronitrile(C_(4)F_(7)N)is potentially used in gas-insulated transformers(GIT)to replace sulphur hexafluoride(SF_(6)).However,evaluation of the long-term insulation reliability and gas–solid interface discharge decomposition characteristics of the gas–solid film insulation structure in GIT is indispensable.The authors simulated the gas–solid film insulation structure in GIT and explored the interface partial discharge(PD)characteristics of C4F7N/CO_(2)gas mixture with polyethylene terephthalate(PET).The effect of gas pressure,mixing ratio on gas–solid interface gas decomposition,PET degradation was investigated,and the interaction mechanism was analysed.It is found that the interface PD generated three degradation regions on a PET film.The gas–solid interface reaction in the electrode contact region and the discharge development trace was significantly higher than that of halation region.The content of gas decomposition products decreases with the increase of gas pressure and the PD intensity of SF6-PET is inferior to that of C_(4)F_(7)N/CO_(2)under the same condition.Relevant results provide reference for the development and application of C_(4)F_(7)N/CO_(2)based GIT. | Song Xiao Yifan Wang Chenhua Ren Haoran Xia Yue Zhao Jingzi Qin Xiaoxing Zhang Yi Luo Yi Li | 2024 | High Voltage2024，9，1： | 0 |
| 19 | PUMD:a PU learning-based malicious domain detection framework显示文摘Domain name system(DNS),as one of the most critical internet infrastructure,has been abused by various cyber attacks.Current malicious domain detection capabilities are limited by insufficient credible label information,severe class imbalance,and incompact distribution of domain samples in different malicious activities.This paper proposes a malicious domain detection framework named PUMD,which innovatively introduces Positive and Unlabeled(PU)learning solution to solve the problem of insuffcient label information,adopts customized sample weight to improve the impact of class imbalance,and effectively constructs evidence features based on resource overlapping to reduce the intra-class distance of malicious samples.Besides,a feature selection strategy based on permutation importance and binning is proposed to screen the most informative detection features.Finally,we conduct experiments on the open source real DNS traffic dataset provided by QI-ANXIN Technology Group to evaluate the PUMD framework's abil-ity to capture potential command and control(C&C)domains for malicious activities.The experimental results prove that PUMD can achieve the best detection performance under different label frequencies and class imbalance ratios. | Zhaoshan Fan Qing Wang Haoran Jiao Junrong Liu Zelin Cui Song Liu Yuling Liu | 2023 | Cybersecurity2023，6，1： | 0 |
| 20 | A defective iron-based perovskite cathode for high-performance IT-SOFCs:Tailoring the oxygen vacancies using Nb/Ta co-doping显示文摘The sluggish kinetics of the electrochemical oxygen reduction reaction(ORR)in intermediatetemperature solid oxide fuel cells(IT-SOFCs)greatly limits the overall cell performance.In this study,an efficient and durable cathode material for IT-SOFCs is designed based on density functional theory(DFT)calculations by co-doping with Nb and Ta the B-site of the SrFeO_(3-δ)perovskite oxide.The DFT calculations suggest that Nb/Ta co-doping can regulate the energy band of the parent SrFeO_(3-δ)and help electron transfer.In symmetrical cells,such cathode with a SrFe_(0.8)Nb_(0.1)Ta_(0.1)O_(3-δ)(SFNT)detailed formula achieves a low cathode polarization resistance of 0.147Ωcm^(2) at 650℃.Electron spin resonance(ESR)and X-ray photoelectron spectroscopy(XPS)analysis confirm that the co-doping of Nb/Ta in SrFeO_(3-δ)B-site increases the balanced concentration of oxygen vacancies,enhancing the electrochemical performance when compared to 20 mol%Nb single-doped perovskite oxide.The cathode button cell with NiSDC|SDC|SFNT configuration achieves an outstanding peak power density of 1.3 W cm^(-2)at 650℃.Moreover,the button cell shows durability for 110 h under 0.65 V at 600℃ using wet H_(2) as fuel. | Bayu Admasu Beshiwork Xinyu Wan Min Xu Haoran Guo Birkneh Sirak Teketel Yu Chen Jun Song Chen Tingshuai Li Enrico Traversa | 2024 | Journal of Energy Chemistry2024，88，1： | 0 |
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