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A new insight into the promoting effects of transition metal phosphides in methanol electrooxidation

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Chinese Chemical Letters 2023年第6期34卷 200-205页

作者： Junjie Ding shaojie jing Changqing Yin Chaogang Ban Kaiwen Wang Xue Liu Youyu Duan Yuxin Zhang Guang Han Liyong Gan Jinsong Rao College of Physics and Center of Quantum Materials and Devices Chongqing UniversityChongqing 401331China College of Material Science and Engineering Chongqing UniversityChongqing 400044China Beijing Key Laboratory of Microstructure and Property of Advanced Materials Beijing University of TechnologyBeijing 100024China

The construction of highly active catalysts for methanol oxidation reaction(MOR)is central to direct methanol fuel *** progress has been made in transition metal phosphides(TMPs)based ***,TMPs would be partially damaged and transformed into new substances(e.g.,Pt-M-P composite,where M represents a second transition metal)during Pt deposition *** would pose a large obstacle to the cognition of the real promoting effects of TMPs in ***,Co_(2)P co-catalysts(Pt-P/Co_(2)P@NPC,where NPC stands for N and P co-doped carbon)and Pt-Co-P composite catalysts(Pt-CoP/NPC)were controllably *** tests show that the Pt-Co-P/NPC exhibits superior MOR activity as high as 1016 m A/mg_(Pt),significantly exceeding that of Pt-P/Co_(2)P@NPC(345 m A/mg_(Pt)).This result indicates that the promoting effect is ascribed primarily to the resultant Pt-Co-P composite,in sharply contrast to previous viewpoint that Co_(2)P itself improves the *** mechanistic studies reveal that Pt-Co-P/NPC exhibits much stronger electron interaction and thus manifesting a remarkably weaker CO absorption than Pt-P/Co_(2)P@NPC and Pt/***,Pt-Co-P is also more capable of producing oxygen-containing adsorbate and thus accelerating the removal of surface-bonded CO^(*),ultimately boosting the MOR performance.

关键词： Promoting effect Transition metal phosphides Pt-Co-P composite Catalytic mechanisms Methanol oxidation reaction

面向数控下料加工的集成化板材优化下料系统的研究

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现代工业经济和信息化 2016年第5期6卷 80-81页

作者：井少杰中航飞机股份有限公司汉中飞机分公司陕西汉中723213

通过将板材下料与优化下料技术进行融合,开发出面向数控下料加工的集成化板材优化下料系统,从而提升板材的材料利用率、数控下料加工效率,就此详细论述了优化下料系统的总设计方案。

关键词：数控下料加工集成化板材优化下料系统

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基于自然标注的跨平台虚拟账号关联方法研究

计算机应用与软件 2024年第9期41卷 190-194页

作者：季铎敬少杰彭如香孔华锋中国刑事警察学院辽宁沈阳110854 公安部第三研究所上海201204 武汉商学院湖北武汉430056

随着大数据时代的到来,跨平台虚拟账号的关联成为网络监管领域亟待解决的问题。该文以微博、微信等用户文本数据为研究对象,通过对数据的抽样和人工标注,开展开放式社交平台中跨平台账号自然标注行为的量化分析,并由此提出基于用户自然... 详细信息

随着大数据时代的到来,跨平台虚拟账号的关联成为网络监管领域亟待解决的问题。该文以微博、微信等用户文本数据为研究对象,通过对数据的抽样和人工标注,开展开放式社交平台中跨平台账号自然标注行为的量化分析,并由此提出基于用户自然标注的跨平台虚拟账号的关联方法。该方法针对自然标注特点,构建基于上下字词特征的虚拟账号识别的模型,并利用二分类的深度学习模型进行昵称和用户的同一认证,最终实现对跨平台虚拟账号的识别,识别准确率达到85%以上。

关键词：虚拟账号自然标注账号关联

Correlating the Interfacial Polar-Phase Structure to the Local Chemistry in Ferroelectric Polymer Nanocomposites by Combined Scanning Probe Microscopy

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Nano-Micro Letters 2023年第1期15卷 80-93页

作者： Jiajie Liang shaojie Wang Zhen Luo jing Fu Jun Hu Jinliang He Qi Li State Key Laboratory of Power System Department of Electrical EngineeringTsinghua UniversityBeijing 100084People’s Republic of China

Ferroelectric polymer nanocomposites possess exceptional electric properties with respect to the two otherwise uniform phases,which is commonly attributed to the critical role of the matrix-particle interfacial ***,the structure-property correlation of the interface remains unestablished,and thus,the design of ferroelectric polymer nanocompos-ite has largely relied on the trial-and-error ***,a strategy that combines multi-mode scanning probe microscopy-based electrical charac-terization and nano-infrared spectroscopy is developed to unveil the local structure-property correlation of the interface in ferroelectric polymer *** results show that the type of surface modifiers decorated on the nanoparticles can significantly influence the local polar-phase content and the piezoelectric effect of the polymer matrix surrounding the *** strongly coupled polar-phase content and piezoelectric effect measured directly in the interfacial region as well as the computed bonding energy suggest that the property enhancement originates from the formation of hydrogen bond between the surface modifiers and the ferroelectric *** is also directly detected that the local domain size of the ferroelectric polymer can impact the energy level and distribution of charge traps in the interfacial region and eventually influence the local dielectric strength.

关键词： Interfaces Ferroelectric polymers Nanocomposites Scanning probe microscopy Nano-infrared spectroscopy

Experimental realization of chiral Landau levels in two-dimensional Dirac cone systems with inhomogeneous effective mass

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Light(Science & Applications) 2023年第8期12卷 1616-1622页

作者： Hongwei Jia Mudi Wang shaojie Ma Ruo-Yang Zhang jing Hu Dongyang Wang Che Ting Chan Department of Physics the Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Institute for Advanced Study the Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Department of Physics University of Hong KongHong KongChina

Chiral zeroth Landau levels are topologically protected bulk *** particle physics and condensed matter physics,the chiral zeroth Landau level plays a significant role in breaking chiral symmetry and gives rise to the chiral *** experimental works on such chiral Landau levels are mainly based on three-dimensional Weyl degeneracies coupled with axial magnetic *** realizations using two-dimensional Dirac point systems,being more promising for future applications,were never experimentally realized *** we propose an experimental scheme for realizing chiral Landau levels in a two-dimensional photonic *** introducing an inhomogeneous effective mass through breaking local parity-inversion symmetries,a synthetic in-plane magnetic field is generated and coupled with the Dirac ***,the zeroth-order chiral Landau levels can be induced,and the one-way propagation characteristics are experimentally *** addition,the robust transport of the chiral zeroth mode against defects in the system is also experimentally *** system provides a new pathway for the realization of chiral Landau levels in two-dimensional Dirac cone systems,and may potentially be applied in device designs utilizing the chiral response and transport robustness.

关键词： chiral Landau realization

Effect of hydrogen impurities on hydrogen oxidation activity of Pt/C catalyst in proton exchange membrane fuel cells

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Clean Energy 2023年第1期7卷 139-147页

作者： Yufeng Qin Chaoyong Sun shaojie Ke Rou Wen Yifan Wang jing Ji Meiling Dou State Key Laboratory of Chemical Resource Engineering Laboratory of Electrochemical Process and Technology for materialsBeijing University of Chemical TechnologyBeijing 100029China

High-purity of hydrogen is vital to the guarantee of end usage in proton exchange membrane fuel cell(PEMFC)electric vehicles(EVs)with superior durability and low ***,the currently employed hydrogen,primarily from fossil fuel,still contains some poisoning impurities that significantly affect the durability of ***,we investigate the poisoning effect of several typical hydrogen impurities(S^(2-),Cl^(-),HCOO^(-)and CO_(3)^(2-))on the hydrogen oxidation reaction(HOR)of the state-of-the-art carbon-supported platinum(Pt/C)catalyst used in the PEMFC *** results indicate that the electrochemically active surface area of Pt/C is hampered by these hydrogen impurities with reduced effective Pt reactive sites due to the competitive adsorption against hydrogen at Pt sites showing the extent of the poisoning on Pt sites in the order:S^(2-)>Cl^(-)>HCOO^(-)>CO_(3)^(2-).Density functional theory calculations reveal that the adsorption energy of S2-on Pt(111)is greater than that of Cl^(-),HCOO^(-)and CO_(2),and the electronic structure of Pt is found to be changed due to the adsorption of impurities showing the downshift of the d-band centre of Pt that weakens the adsorption of hydrogen on the Pt *** work provides valuable guidance for future optimization of hydrogen quality and also emphasizes the importance of anti-poisoning anode catalyst development,especially towards H_(2)S impurities that seriously affect the durability of PEMFCs.

关键词： hydrogen impurity poisoning effect electronic structure Pt/C hydrogen oxidation catalysis fuel cell

An alternative approach to determine critical angle of contrast reversal and surface roughness of oil slicks under sunglint

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International Journal of Digital Earth 2018年第9期11卷 972-979页

作者： Yansha Wen Mengqiu Wang Yingcheng Lu shaojie Sunc Minwei Zhang Zhihua Mao jing Shi Yongxue Liu International Institute for Earth System Science Nanjing UniversityNanjingPeople’s Republic of China State Key Laboratory of Satellite Ocean Environment Dynamics SOAHangzhouPeople’s Republic of China College of Marine Science University of South FloridaSt.PetersburgFLUSA

The critical angle is the angle at which the contrast of oil slicks reverse their contrasts against the surrounding oil-free seawater under *** determination of the critical angle can help estimate surface roughness and refractive index of the oil *** it’s difficult to determine a certain critical angle,the potential critical angle range help to improve the estimation *** this study,the angle between the viewing direction and the direction of mirror reflection is used as an indicator for quantifying the critical angle and could be calculated from the solar/viewing geometry from observations of the Moderate Resolution Imaging Spectroradiometer(MODIS).The natural seep oil slicks in the Gulf of Mexico were first delineated using a customized segmentation approach to remove noise and apply a morphological *** the basis of the histograms of the brightness values of the delineated oil slicks,the potential range of the critical angle was determined,and then an optimal critical angle between oil slicks and seawater was then determined from statistical and regression analyses in this *** critical angle corresponds to the best fitting between the modeled and observed surface roughness of seep oil slicks and seawater.

关键词： Sunglint critical angle natural seep oil slicks surface roughness MODIS

Transition of Streamer, Corona and Glow Discharges in Needle-to-plane Dielectric Barrier Discharge at Atmospheric Pressure Air

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高电压技术 2013年第10期39卷 2553-2559页

作者： YU Zhe YANG Haidong DU Huan YAO jing XU shaojie ZHANG Zhitao Institute of Marine Engineering Dalian Maritime University Dalian 116026 China Department of Physics Dalian Maritime University Dalian 116026 China

To discuss the modes of dielectric barrier discharge(DBD) between needle-to-plane electrodes in air,DBD is generated and observed on a needle-to-plane device at atmospheric pressure *** images of the DBD are taken by using a charge couple device(CCD) cinema with a macro lens,while the electrical and photo-electricity waveforms of the DBD are *** current waveforms show that under an applied voltage of 3 kV,there are numerous short current pulses in both positive and negative half-periods of ***,under 6 kV,there are still the numerous short current pulses in the positive half-periods,but only one wide current pulse in each negative *** difference is also found in the photoelectric *** streamer,corona and glow discharges are observed from the images of the discharges at different applied *** structure of glow discharge in the negative period is exactly the same as that of the low pressure glow ***,in the positive period of discharge there is always a *** the negative period of discharge,while the applied voltage increases,the transition from corona to glow discharge is *** progress of a transition between streamer and glow discharge at 6 kV during one period is *** glow discharge appearance is determined by two factors: the discharge current is limited to a certain extent by the dielectric layer; the charges deposited on the dielectric layer during the last half period enhance the intensity of the electric *** an insufficient applied voltage,the cathode drop leads to no glow discharge,but Trichel pulses.

关键词：介质阻挡放电辉光放电平面电极流光空气电晕电荷耦合器件电流脉冲

LA-D-B1,a novel Abemaciclib derivative,exerts anti-breast cancer effects through CDK4/6

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BIOCELL 2024年第5期48卷 847-860页

作者： LING MA ZIRUI JIANG XIAO HOU YUTING XU ZIYUN CHEN SIYI ZHANG HANXUE LI shaojie MA GENG ZHANG XIUJUN WANG jing JI Jiangsu Key Laboratory of Marine Pharmaceutical Compound Screening College of PharmacyJiangsu Ocean UniversityLianyungang222000China School of Medicine Xiamen UniversityXiamen361102China

Background:Regulatory proteins involved in human cellular division and proliferation,cyclin-dependent kinases 4 and 6(CDK4/6)are overexpressed in numerous cancers,including triple-negative breast cancer(TNBC).TNBC is a common pathological subtype of breast cancer that is prone to recurrence and metastasis,and has a single treatment *** one of the CDK4/6 inhibitors,abemaciclib can effectively inhibit the growth of breast *** this study,we synthesized LA-D-B1,a derivative of Abemaciclib,and investigated its anti-tumor effects in breast ***:Cellular viability was assessed using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide(MTT)*** cloning and migration abilities were determined by colony formation assay and wound healing *** invasion abilities and adhesion were determined by cell invasion assay and cell adhesion *** impact of compound LA-D-B1 on cell proliferation and the cell cycle was analyzed through Western blotting,which quantified the levels of proteins associated with the cyclin-dependent kinase(CDK)4/6-cyclin D-Rb-E2F *** in vivo anti-tumor activity of compound LA-D-B1 was investigated using a chick chorioallantoic membrane(CAM)***:The study demonstrated that LA-D-B1 effectively suppressed breast cancer cell proliferation,induced apoptosis,and caused cell cycle ***,LA-D-B1 reduced the expression of key proteins in the CDK4/6-cyclin D-Rb-E2F pathway,including CDK4,CDK6 and *** results also indicated significant antitumor activity of LA-D-B1 in a transplanted tumor ***:In this study,LA-D-B1 demonstrated a potent anti-tumor effect by effectively suppressing cell proliferation and inhibiting cell cycle progression in breast *** findings highlight the potential of LA-D-B1 as a valuable compound for enhancing therapeutic outcomes and controlling the progression of breast cancer.

关键词： CDK4/6 inhibitor Breast cancer Antitumor activity Cell cycle