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Wet-milling synthesis of immobilized Pt/Ir nanoclusters as promising heterogeneous catalysts

Nano Research 2022年第4期15卷 3065-3072页

作者： peng du Kai Huang Xiaoyuan Fan Jingteng Ma Naveed Hussain Ruyue Wang Bohan Deng Binghui Ge Haolin Tang Ru Zhang Ming Lei Hui Wu State Key Laboratory of Information Photonics and Optical Communications&School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Institutes of Physical Science and Information Technology Anhui UniversityHefei 230601China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Being a typical state of the art heterogeneous catalyst,supported noble metal catalyst often demonstrates enhanced catalytic ***,a facile synthetic method for realizing large-scale and low-cost supported noble metal catalyst is strictly *** this end,by making use of the strong metal-support interaction(SMSI)and mechanochemical reaction,we introduce an efficient synthetic route to obtain ultrafine Pt and Ir nanoclusters immobilized on diverse substrates by wet chemical *** further demonstrate the scaling-up effect of our approach by large-scale ball-milling production of Pt nanoclusters immobilized on TiO_(2)*** synthesized Pt/Ir@Co_(3)O_(4)catalysts exhibit superior oxygen evolution reaction(OER)performance with only 230 and 290 mV overpotential to achieve current density of 10 and 100 mA·cm^(-2),beating the catalytic performance of Co_(3)O_(4)supported Pt or Ir clusters and commercial Ir/*** is envisioned that the present work strategically directs facile ways for fabricating supported noble metal heterogeneous catalysts.

关键词： heterogeneous catalysts metal clusters wet milling large-scale production strong metal–support interaction

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基于混合词向量深度学习模型的DGA域名检测方法

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计算机研究与发展 2020年第2期57卷 433-446页

作者：杜鹏丁世飞中国矿业大学计算机科学与技术学院江苏徐州221116 矿山数字化教育部工程研究中心(中国矿业大学) 江苏徐州221116

域名生成算法(domain generation algorithm,DGA)是域名检测中防范僵尸网络攻击的重要手段之一,对于生成威胁情报、阻断僵尸网络命令与控制流量、保障网络安全有重要的实际意义.近年来,DGA域名检测技术从依靠手工提取特征发展到自动提... 详细信息

域名生成算法(domain generation algorithm,DGA)是域名检测中防范僵尸网络攻击的重要手段之一,对于生成威胁情报、阻断僵尸网络命令与控制流量、保障网络安全有重要的实际意义.近年来,DGA域名检测技术从依靠手工提取特征发展到自动提取特征的基于深度学习模型的方法,在DGA域名检测任务中取得了较大的进展.但对于不同僵尸网络家族的DGA域名的多分类任务,由于家族种类多,且各家族域名数据存在不平衡性,因此许多已有的深度学习模型在DGA域名的多分类任务上仍有提高空间.针对以上挑战,设计了基于字符和双字母组级别的混合词向量,以提高域名字符串的信息利用度,并设计了基于混合词向量方法的深度学习模型.最后设计了包含多种对比模型的实验,对混合词向量的有效性进行验证.实验结果表明基于混合词向量的深度学习模型在DGA域名检测与分类任务中相比只基于字符级词向量的模型有更好的分类性能,特别是在小样本的DGA域名类别上的分类性能更优,证明了该模型的有效性.

关键词：域名生成算法混合词向量深度学习卷积神经网络长短期记忆网络

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Interpretation of the Spatial Distribution Characteristics of the Co-seismic Landslides Induced by the 1920 Haiyuan M81/2 Earthquake Using Remote Sensing Images

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Earthquake Research in China 2020年第4期34卷 523-545页

作者： ZHANG Weiheng XU Yueren du peng LI Wenqiao TIAN Qinjian CHEN Lize Key Laboratory of Earthquake Prediction Institute of Earthquake ForecastingChina Earthquake AdministrationBeijing 100036China State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China

Analyzing the spatial distribution characteristics of earthquake-induced secondary disasters based on advanced techniques is significantly important,especially in understanding the process of strong earthquakes in the Loess *** ArcGIS,this study interprets multi-temporal high-resolution satellite images,field investigation data,and historical seismic *** conclusions are obtained as follows:①Landslides induced by the Haiyuan earthquake are mainly distributed in the intersection area of the end of the Haiyuan fault and Liupanshan fault,as indicated by multiple dense distribution centers;②The landslide distribution of the Haiyuan Earthquake is determined by the distance to the fault,topographic relief,slope,lithology,and other *** detail,the closer the distance to the fault,the greater the density of the *** greater the slope and relief of the terrain,the greater the density and the smaller the average area of a *** with tertiary strata,Quaternary strata has a larger average area,and the density of the landslides is smaller;③The density curve of the death toll in the Haiyuan earthquake can be used as a reference for the distribution of co-seismic *** Haiyuan co-seismic landslides are distributed in the Tongwei landslide area;however,the major landslides here are induced by the 1718 Tongwei earthquake rather than the 1920 Haiyuan earthquake;④The co-seismic landslides of the Haiyuan earthquake exhibits the“slope effect”in the south-west plate of Haiyuan fault,presenting the dominant sliding direction towards the fault and epicenter;however,the“slope effect”is not evident in the northeast plate of the fault.

关键词： 1920 Haiyuan earthquake Earthquake-induced landslide Slope effect

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The Volume Calculation Method of Rock Collapses and Loess Landslides Triggered by the 1556 AD Huaxian M81/2 Earthquake in Shaanxi Province, China

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Earthquake Research in China 2020年第4期34卷 599-616页

作者： ZHANG Yanbo XU Yueren du peng LI Wenqiao CHEN Lize TIAN Qinjian Key Laboratory of Earthquake Prediction Institute of Earthquake ForecastingChina Earthquake AdministrationBeijing 100036China

Accurate volume calculation of each individual landslide triggered by strong historical earthquakes can help understand the characteristics of the typical earthquake-induced landslides,thus providing significant information for the modification of the focal parameters of historical *** this study,we select one rock fall and three loess landslides triggered by the 1556 AD Huaxian M8⅟􀄟earthquake,compute their volumes using the low-altitude high-precision Unmanned Aerial Vehicle(UAV)photogrammetry and landslide profile restoration *** results show that:①the whole influencing area of the Huangjiagou Rock Fall is approximately 3.03×105 m2 and the area of the collapsed rock accumulated at the slope foot is 3.33×104 m2,accounting for approximately 10%of the entire influencing ***,the estimated volume of the collapsed rock is only 0.699×106 m3,indicating a rock fall with large influencing range but limited collapsed rock;②the geological form of thethree loess landslides are preserved intactly,with volumes of 0.283×108 m3,0.074×108 m3,and 0.377×108 *** important geological hazard relics reflect the strong vibrations and severe casualties in the meizoseismal area;③loess landslides are the key reason of the serious death toll in the hilly-gully loess *** new method can be used to estimate the influencing area and the actual volume of each individual landslide,and rationally evaluate the role of earthquake landslides in the *** addition,quantitative research on secondary disasters triggered by strong historical earthquakes is beneficial for understanding the surface process and focal parameters of the earthquakes.

关键词： 1556 AD Huaxian earthquake Rock fall Loess landslide Volume calculation

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Comparative Study on Population Ageing Between China and Other Asian Countries

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Sociology Study 2011年第2期1卷 96-100页

作者： Hui Yang peng du All-China Women＇s Federation Women＇s Studies Institute of China Centre for Population and Development Studies Renmin University of China

Compared with developed countries, the main characteristics of population ageing in China have been regarded as a rapid ageing society. However, China and other Asian countries have been experiencing the demographic transition simultaneously, it is better to understand the characteristics of population ageing in China when compared with other Asian countries. Using the latest UN data, this paper compares the percentage of elderly population, the speed of ageing and the size of aged population among China and other Asian countries. The result indicates that China has a relatively high percentage of aged population, relatively rapid ageing population and will keep the largest size of aged population of the world in the next 60 years.

关键词： Population ageing speed of ageing size of aged population

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Aloe emodin promotes mucosal healing by modifying the differentiation fate of enteroendocrine cells via regulating cellular free fatty acid sensitivity

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Acta Pharmaceutica Sinica B 2024年第9期14卷 3964-3982页

作者： Weilian Bao Jiaren Lyu Guize Feng Linfeng Guo Dian Zhao Keyuan You Yang Liu Haidong Li peng du Daofeng Chen Xiaoyan Shen Department of Pharmacology&the Key Laboratory of Smart Drug Delivery Ministry of Education School of PharmacyFudan UniversityShanghai 201210China Department of Natural Medicine School of PharmacyFudan UniversityShanghai 201210China Department of Colorectal and Anal Surgery Xinhua HospitalShanghai Jiao Tong University School of MedicineShanghai 200092China Shanghai Colorectal Cancer Research Center Shanghai 200092China

The proper differentiation and reorganization of the intestinal epithelial cell population is critical to mucosal regeneration post *** retaining cells(LRCs)expressing SRY-box transcription factor 9(SOX9)promote epithelial repair by replenishing LGR5 t intestinal stem cells(ISCs).While,LRCs are also considered precursor cells for enteroendocrine cells(EECs)which exacerbate mucosal damage in inflammatory bowel disease(IBD).The factors that determine LRC-EEC differentiation and the effect of intervening in LRC-EEC differentiation on IBD remain *** this study,we investigated the effects of a natural anthraquinone called aloe emodin(derived from the Chinese herb rhubarb)on mucosal healing in IBD *** findings demonstrated that aloe emodin effectively interfered with the differentiation to EECs and preserved a higher number of SOX9t LRCs,thereby promoting mucosal ***,we discovered that aloe emodin acted as an antagonist of free fatty acid receptors(FFAR1),suppressing the FFAR1-mediated Gbg/serine/threonine-protein kinase(AKT)pathway and promoting the translocation of forkhead box protein O1(FOXO1)into the nucleus,ultimately resulting in the intervention of differentiation *** findings reveal the effect of free fatty acid accessibility on EEC differentiation and introduce a strategy for promoting mucosal healing in IBD by regulating the FFAR1/AKT/FOXO1 signaling pathway.

关键词： LRCs ISCs EECs IBD SOX9 Aloe emodin FFAR1 FOXO1

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Tunable ultrathin dual-phase P-doped Bi_(2)MoO_(6) nanosheets for advanced lithium and sodium storage

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Nano Research 2022年第7期15卷 6128-6137页

作者： Fucong Lyu Zhe Jia Shanshan Zeng Fei-Xiang Ma Lulu Pan Lizi Cheng Yan Bao Ligang Sun Weihui Ou peng du Yang Yang Li Jian Lu Centre for Advanced Structural Materials City University of Hong Kong Shenzhen Research InstituteGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceShenzhen 518057China Hong Kong Branch of National Precious Metals Material Engineering Research Centre City University of Hong KongKowloonHong KongChina School of Materials Science and Engineering Southeast UniversityNanjing 211189China School of Science Harbin Institute of TechnologyShenzhen 518055China Department of Mechanical Engineering City University of Hong KongKowloonHong KongChina CityU-Shenzhen Futian Research Institute Shenzhen 518045China Center of Super-Diamond and Advanced Films(COSDAF) City University of Hong KongKowloonHong KongChina Department of Material Science and Engineering City University of Hong KongKowloonHong KongChina

The construction of electrode materials for lithium-ion batteries(LIBs)and sodium-ion batteries(SIBs)has gradually been an appealing and attractive technology in energy storage research *** the present work,a facile strategy of synthesizing ultrathin amorphous/nanocrystal dual-phase P-doped Bi_(2)MoO_(6)(denoted as P-BiMO)nanosheets via a one-step wet-chemical synthesis approach is *** distinct from conventional two-dimensional(2D)nanosheets,our newly developed ultrathin P-BiMO nanosheets exhibit a unique tunable amorphous/nanocrystalline dual-phase structure with several compelling advantages including fast ion exchange ability and superb volume change buffer *** experimental results reveal that our prepared P-BiMO-6 electrode delivers an excellent reversible capacity of 509.6 mA·g^(−1) after continuous 1,500 cycles at the current densities of 1,500 mA·g^(−1) and improved rate performance for *** the meanwhile,the P-BiMO-6 electrode also shows a reversible capacity of 300.6 mA·g^(−1) after 100 cycles at 50 mA·g^(−1) when being used as the SIBs *** present work uncovers an effective dual-phase nanosheet structure to improve the performance of batteries,providing an attractive paradigm to develop superior electrode materials.

关键词： amorphous/nanocrystalline dual-phase structure ultrathin nanosheets P-doped Bi_(2)MoO_(6) anode materials lithium-ion batteries sodium-ion batteries

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Quasi-two-dimensional bismuth oxychalcogenide nanoflakes as novel anode for potassium-ion batteries

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Rare Metals 2022年第8期41卷 2567-2574页

作者： Shao-Jun Fang peng du Jia-Feng Zhang Chun-Hui Wang Zhi-Ming Xiao Bao Zhang Liang Cao Xin-Ming Fan Xing Ou School of Metallurgy and Environment Central South UniversityChangsha410083China

Potassium-ion batteries(PlBs)are considered as the promising alternative of lithium-ion batteries,due to their abundance natural resources,high cost-effectiveness,and similar working *** the development of PIBs,due to the larger ionic radius of potassium compared to that of lithium,the urgent demand of suitable anode materials with steady structure and fast carrier diffusion is of primary importance.

关键词： lithium potassium radius

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Effects of TiC on the microstructure and formation of acicular ferrite in ferritic stainless steel

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International Journal of Minerals,Metallurgy and Materials 2019年第11期26卷 1385-1395页

作者： Yang Li peng-fei du Zhou-hua Jiang Cong-lin Yao Lu Bai Qi Wang Guang Xu Chang-yong Chen Lei Zhang Hua-bing Li School of Metallurgy Northeasten University

The formation mechanism of acicular ferrite and its microstructural characteristics in 430 ferrite stainless steel with TiC additions were studied by theory and *** an"edge?to?edge matching"model,a 5.25 mismatch between TiC(FCC structure)and ferritic stainless steel(BCC structure)was identified,which met the mismatch requirement for the heterogeneous nucleation of 430 ferritic stainless *** was found to be an effective nucleation site for the formation of acicular ferrite in a smelting experiment,as analyzed by metallographic examination,Image-Pro Plus 6.0 analysis software,and SEM–***,small inclusions in the size of 2–4?m increased the probability of acicular ferrite nucleation,and the secondary acicular ferrite would grow sympathetically from the initial acicular ferrite to produce multi-dimensional acicular ***,the addition of Ti C can increase the average microstrain and dislocation density of 430 ferrite stainless steel,as calculated by Williamson-Hall(WH)method,which could play some role in strengthening the dislocation.

关键词： acicular ferrite dislocation density stainless steel TiC grain refiner oxide metallurgy

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A corona modulation device structure and mechanism based on perovskite quantum dots random laser pumped using an electron beam

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Frontiers of Optoelectronics 2020年第3期13卷 291-302页

作者： Yan ZHU Yining MU Fanqi TANG peng du Hang REN School of Science Changchun University of Science and TechnologyChangchun 130022China

Although laser pumping using electron beam(EB)has high transient power output and easy modulation based on perovskite quantum dot(PQD)film,its lasing emitting direction is the same as the pumped EB's ***,realizing the conventional direct device structure through the film lasing mechanism is extremely ***,using the random lasing principle,herein,we proposed a corona modulation device structure based on PQDs random laser pumped using an *** discussed and stimulated the optimized designed method of the device in terms of parameters of the electronic optical device and the utilization ratio of output power and its modulation extinction ratio,*** to the simulation results,this type of device structure can effectively satisfy the new random lasing mechanism in terms of high-speed and high-power modulation.

关键词： corona modulation perovskite quantum dot(PQD) random laser electron beam(EB)

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