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Synergistically enhanced ORR and HER performance on Co-N-C coupled in-situ generated PtCo intermetallic

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Journal of Energy Chemistry 2025年第1期100卷 721-729页

作者： Guanyu luo Min Song Lulu An Xiao Huang qian Zhang Chenhao Zhang Tao Shen Shuang Wang Deli Wang Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology) Ministry of Education School of Chemistry and Chemical Engineering Huazhong University of Science and Technology

Integrating multi-scale sites in a composite catalyst is vital to realize efficient ***,a synergistic composite catalyst consisting of Co atomic sites and in-situ generated PtCo intermetallic compounds （IMCs）(o-PtCo@CoNC) is proposed through Co pre-anchoring and subsequent impregnation-reduction *** loading of Co atoms provides a chance for in-situ generating PtCo ordered intermetallic *** remaining Co single atoms and PtCo IMCs construct synergistic electrocatalytic *** from the ordered structure,synergistic effect of Pt Co IMCs and Co single atoms,o-PtCo@CoNC exhibits excellent electrocatalytic performance for oxygen reduction reaction （ORR） and hydrogen evolution reaction （HER） with mass activity of 1.21 A mgPt-1（at 0.9 V） and5.70 A mgPt-1（at an overpotential of 100 mV）,***,o-PtCo@CoNC delivers negligible loss of half-wave potential and overpotential during long-term stability test in acid solutions,with 13 mV decay after 50,000 potential cycles for ORR and a 2.7 mV decay after 20,000 potential cycles for *** integration strategy of single-atomic sites coupled IMCs paves the way for enhancing the activity and durability of Pt-based electrocatalysts.

关键词： Electrolytic reduction

Revolutionizing breast cancer detection:Advances in fluorescent probe technology

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Nano Research 2025年第1期18卷 653-674页

作者： qian Gao Lin Tang Jun Zhan Yiyuan Xue Feng luo State Key Laboratory of Oral Diseases&National Center for Stomatology&National Clinical Research Center for Oral Diseases West China Hospital of StomatologySichuan UniversityChengdu 610041China Emergency Obstetrics and Gynecology West China Second University HospitalSichuan UniversityChengdu 610041China Department of Obstetrics and Gynecology West China Second University HospitalSichuan UniversityChengdu 610041China Department of Prosthodontics West China School of StomatologySichuan UniversityChengdu 610041China

With the increasing incidence of breast cancer globally,there is an urgent demand for enhanced diagnostic and therapeutic *** comprehensive review explores advancements in fluorescent probe technology for breast cancer imaging and early *** probes offer unparalleled sensitivity and specificity in detecting cancer biomarkers,enabling early diagnosis and delineation of tumor margins during *** categorize these probes into molecular,nano,ratiometric,the second near-infrared window(NIR-II),and multifunctional varieties,each with unique capabilities for targeting specific cancer *** review highlights recent innovations in probe design,emphasizing their applications in pathogenesis studies,drug development,precision medicine,and fluorescence-guided *** their promising clinical potential,challenges such as safety,biomarker targeting accuracy,system compatibility,and clinical translation *** these hurdles is crucial for the integration of fluorescent probes into standard cancer care,aiming to improve treatment outcomes and patient quality of life.

关键词： breast cancer fluorescent probes imaging early diagnosis biomarker

A Hardy–Trudinger–Moser Inequality Involving LpNorm in the Hyperbolic Space

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Acta Mathematica Sinica,English Series 2020年第6期36卷 711-722页

作者： qian Jin luo Department of Mathematics Renmin University of ChinaBeijing 100872P.R.China

Let B be the unit disc in R2,H be the completion of C0∞(B)under the norm||u||=(∫B|▽U|^2dx-∫Bu^2/(1-|x|^2)^2dx)^1/2,U∈C^∞0(B).By the method of blow-up analysis and an argument of rearrangement with respect to the standard hyperbolic metric dv=dx/(1-|x|^2)^2,we prove that,for any fixedα,0≤α*** is an analog of early results of Lu–Yang(Discrete ***.,2009)and Yang(***.,2007),and extends those of Wang–Ye(***.,2012)and Yang–Zhu(*** ***.,2016).

关键词： Hardy–Trudinger–Moser inequality blow-up analysis Hardy space

Impact of thermal stratification on airborne transmission risk of SARS-CoV-2 in various indoor environments

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Building Simulation 2023年第7期16卷 1159-1172页

作者： Fan Liu Zhiwen luo Hua qian School of Environment and Architecture University of Shanghai for Science and TechnologyShanghaiChina Welsh School of Architecture Cardiff UniversityCardiffUK School of Energy and Environment Southeast UniversityNanjingChina

There exist various vertical temperature gradients in different-type buildings.A holistic understanding of the impact of different temperature-stratified indoor environments on infection risk is *** this work,the airborne transmission risk of SARS-CoV-2 in different thermally stratified indoor environments is assessed using our previously developed airborne infection risk *** show that the vertical temperature gradients in office building,hospital,classroom,*** within the range of−0.34 to 3.26℃/*** large space such as coach station,airport terminal,and sport hall,the average temperature gradient ranges within 0.13–2.38℃/m in occupied zone(0–3 m);in ice rink with special requirements of indoor environment,the temperature gradient is higher than those in the above indoor *** existence of temperature gradients causes multi-peaks of the transmission risk of SARS-CoV-2 with distancing,and our results show that in office,hospital ward and classroom,the second peak of the transmission risk is higher than 10^(−3)in most contact scenarios,while most being lower than 10^(−6)in large spaces like coach station and *** work is expected to provide some guidance on specific intervention policies in relation to the types of indoor environments.

关键词： SARS-CoV-2 temperature gradient different-type buildings transmission risk

Thermodynamic investigation of phase equilibria in Al–Si–V system

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Journal of Materials Science & Technology 2018年第9期34卷 1592-1601页

作者： Qun luo Kang Li qian Li State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering Shanghai UniversityShanghai 200072 China Materials Genome Institute Shanghai UniversityShanghai 200444 China Shanghai Institute of Materials Genome Shanghai 200444 China

The Al-Si-V system is assessed to understand the phase equilibria of V-containing（3 d transition metal）Al-Si alloys, which are generally of great importance for technical applications. Four annealed alloys were prepared to study the phase equilibria of Al-rich corner（V ≤ 23.3 at.%, Si ≤ 57.6 at.%） in the temperature range of 500-930 ℃. The microstructure and phase constituents of the samples were determined by X-ray diffraction（XRD） and scanning electron microscopy（SEM） equipped with energy dispersive X-ray spectrometer（EDS）, The existence of ternary phase τ（Al（0.6） Si（1.4） V, TiSi2-type） was confirmed with the composition ranging from 17.98 to 18.59 at.% Al and 48.89-49.20 at.% Si. However, it did not equilibrate with fcc（Al） below 868℃, which was determined by differential scanning calorimetry（DSC）. The Si3 V5 appeared in Al58 5 Si（18.3） V（23.2） and Al64 7 Si（20.2） V（15.1） alloys annealed at 500 ℃. It nearly disappeared after3000 h-annealing and its thermodynamic stability was discussed. According to the measured phase relationships, the thermodynamic description of Al-Si-V system was optimized combing with the enthalpies of formation of binary and ternary compounds obtained by density functional theory（DFT）. The Si-V system was modified to obtain the congruent liquidus of Si3 V5 and enthalpy of formation of Si3 V5 and Si2 V with experimental data. By comparing the calculated phase equilibria and phase transitions with experimental data, it showed that a good agreement was reached. The description of Al-Si-V system could be used to guide the development of Al-Si alloys.

关键词： Phase equilibrium Al-Si alloy CALPHAD method Intermetallic compounds Enthalpy of formation

A COUPLED DYNAMIC MODEL OF BRAND ACCEPTANCE AND PROMOTIVE INFORMATION SPREADING

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Journal of Systems Science and Systems Engineering 2018年第5期27卷 677-689页

作者： qian Pan Haoxiang Xia Shuangling luo Institute of Systems Engineering Dalian University of Technology 116024 China College of Shipping Economics andManagement & Collaborative Innovation Center for Transport Studies

When people try to decide to buy or not to, they are often influenced by both their inherentopinions and the social marketing activities e.g. advertising, social news with strong point of *** people will make their final choice, or even convince other people to buy. After all, this is thebrand acceptance formation process. Factually, the dynamics of brand acceptance is essentially aninterwoven dynamics of endogenous opinion dynamics disturbed by an information diffusion *** have a better understanding of the dynamics of brand acceptance, we propose and analyze a coupledagent-based dynamic model that combines the Majority-Rule-based Voter model in opinion dynamicswith the SI Model for information spreading to analyze the dynamics of brand acceptance in socialmedia. We focus on two important parameters in diffusion dynamics： the decayed transmission rate （fl）and the diffusion frequency （f）. When the system is stable, the order parameter of the system is theduration time （r）. In the absence of opinion interaction, the simulation results indicate that, when abrand tries to occupy a larger market share through social marketing approaches, it is always effectiveto let the opponent to be the propaganda target. While with the Majority-Rule-based Voter Modelincluded, we observe that the opinion interaction could have a dual function, which shows that a brandholding a small market share in the first place needs to adopt diverse marketing approaches accordingto different marketing environment types.

关键词： Coupled dynamics social marketing dynamics of brand acceptance opinion dynamics diffusion dynamics

EXPERIMENTAL STUDY AND APPLICATION OF VIBROFLOTATION METHOD AT SEA BOTTOM

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China Ocean Engineering 1990年第3期5卷 329-344页

作者： qian, Zheng luo, Zongxin Tianjin Port Engineering Inst Tianjin China

The vibroflotation technique has now become a comparatively perfect method. However, the stone column driving at the sea bottom, which is liable to ebb and flood tides, is seldom tried abroad and has been tried for the first time at home. We have designed a set of construction techniques for driving and installing stone columns at sea. These techniques have been proved successful and highly efficient by practice. At the sea bottom were conducted three groups of large-scale loading tests and the allowable bearing capacity of the composite foundation was obtained as 130 kPa, against that of the natural foundation: 50 kPa. The allowable bearing capacity of the composite foundation showed 2.6 times as much as that of the natural foundation. Also obtained was the distribution ratio of stress, n = 3. The experience and indexes, obtained from the Yantai Harbour Project, have already been justified in the application in reinforcing the coastal highway at the Huaneng Power Plant of Fuzhou City, Fujian Province.

关键词： Foundations Bearing Capacity Oceanography Ports and Harbors

Elemental Quantitative Distribution and Statistical Analysis on Cross Section of Stainless Steel Sheet by Laser Ablation Inductively Coupled Plasma Mass Spectrometry

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Journal of Iron and Steel Research International 2015年第8期22卷 730-737页

作者： qian-hua luo Hai-zhou WANG Central Iron and Steel Research Institute

An innovative application of laser ablation inductively coupled plasma mass spectrometry （LA-ICP-MS） technique in illustrating elemental distributions on stainless steel sheets was presented. The technique proved to be a systematic and accurate ap- proach in producing visual images or maps of elemental distributions at cross-sectional surface of a stainless steel sheet. Two stain- less steel sheets served as research objects： 3 mm×l 300 mm hot-rolled stainless steel plate and 1 mm×l 260 mm cold-rolled plate. The cross-sectional surfaces of the two samples at 1/4 position along the width direction were scanned （raster area -44 mm2 and 11 mm2） with a focused laser beam （wavelength 213 nm, diameter of laser crater 100 μm, and laser power 1.6 mJ） in a laser abla- tion chamber. The laser ablation system was coupled to a quadrupole ICP-MS, which made the detection of ion intensities of 27A1＋, 44Ca＋, 47Ti-, 55Mn＋ and 56Fe＋ within an area of interest possible. One-dimensional （ID） content line distribution maps and two- dimensional （2D） contour maps for specific positions or areas were plotted to indicate the element distribution of a target area with high accuracy. Statistic method was used to analyze the acquired data by calculating median contents, maximum segregation, sta- tistic segregation and content-frequency distribution.

关键词： stainless steel sheet laser ablation inductively coupled plasma mass spectrometry elemental distribution statistic analysis

Multi-dimensional blind separation method for STBC systems

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Journal of Systems Engineering and Electronics 2013年第6期24卷 912-918页

作者： Minggang luo Liping Li Guobing qian Huaguo Zhang Department of Information Engineering University of Electronic Science and Technology of China

Intercepted signal blind separation is a research topic with high importance for both military and civilian communication systems. A blind separation method for space-time block code （STBC） systems is proposed by using the ordinary independent component analysis （ICA）. This method cannot work when specific complex modulations are employed since the assumption of mutual independence cannot be satisfied. The analysis shows that source signals, which are group-wise independent and use multi-dimensional ICA （MICA） instead of ordinary ICA, can be applied in this case. Utilizing the block-diagonal structure of the cumulant matrices, the JADE algorithm is generalized to the multidimensional case to separate the received data into mutually independent groups. Compared with ordinary ICA algorithms, the proposed method does not introduce additional ambiguities. Simulations show that the proposed method overcomes the drawback and achieves a better performance without utilizing coding information than channel estimation based algorithms.

关键词： multiple input multiple output (MIMO) space-time block code (STBC) multi-dimensional independent component analysis (MICA) blind separation