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堤岸软黏土护坡桩基础水平向承载力特性研究

吉林水利 2024年第4期 31-36页

作者：陆泽林周宇翔苏州市水利设计研究院有限公司江苏苏州215129

为了解决深厚软黏土地质条件下,港口堤岸工程桩基地基处理的承载力问题,以苏州市吴江区横路港治理工程为研究对象,运用现场试桩水平静载试验的方法,研究了试桩水平荷载作用的荷载-位移变化特征以及不同软黏土的p-y曲线特征。结果表明,... 详细信息

为了解决深厚软黏土地质条件下,港口堤岸工程桩基地基处理的承载力问题,以苏州市吴江区横路港治理工程为研究对象,运用现场试桩水平静载试验的方法,研究了试桩水平荷载作用的荷载-位移变化特征以及不同软黏土的p-y曲线特征。结果表明,随着水平荷载的增加,桩基加载点的位移曲线出现2个明显的转折点,实测水平位移随着深度的增加呈非线性迅速减小,并趋于收敛;桩身水平位移沿着深度的发展大致分为3个阶段,水平位移的收敛点位移逐步下移,试桩具有柔性桩工作性能;双曲线型p-y曲线法得到的计算结果与实测值拟合较好,API法则低估了桩周土体的极限抗力和桩顶的水平位移;桩基水平加载变形较大时,可以考虑对双曲线型p-y曲线法得到的桩顶水平位移进行适当折减。

关键词：横路港治理工程 p-y曲线桩基础承载力特性

Recent Research Developments of Perovskite Solar Cells

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Chinese Journal of Chemistry 2014年第10期32卷 957-963页

作者： Yingzhuang Ma Shufeng Wang Lingling Zheng zelin lu Danfei Zhang Zuqiang Bian Chunhui Huang Lixin Xiao State Key Laboratory for Mesoscopic Physics and Department of Physics Peking UniversityBeijing 100871China College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China

For the first time in 2009,the inorganic-organic hybrid perovskite materials were applied in liquid dye-sensitized solar *** 2013,the power conversion efficiency successfully reached 15%,followed by great amount of research papers bursting *** August 2014,the highest efficiency is certified to 17.9%,and the reported efficiency is even up to 19.3%.They quickly go beyond dye-sensitized solar cells and organic solar *** is expected the perovskite has its efficiency same to the single-crystal silicon ***“game changer”of solar cells is *** perovskite solar cells are cheap and easily to be made,which will benefit both science and *** review summarized recent development of both perovskite materials and solar cell devices,not only including new material developments of perovskite compositions,structures,and fabrication methods,but also focusing on device structures,charge transfer mechanism and stability properties of perovskite solar *** perspective is also estimated.

关键词： inorganic-organic hybrid perovskite solar cell

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基于FMECA友谊河站闸安全复核

河南水利与南水北调 2024年第6期53卷 93-94页

作者：朱文博王世辉陆泽林邹晓华汤利成郭军良苏州市水利设计研究院有限公司江苏苏州215129 河南黄河勘测规划设计研究院有限公司河南郑州450000

结合友谊河站闸的实际情况,采用FMECA法对水闸安全性复核分析。现场调查和复核分析判断,友谊河站闸存在一定安全隐患,水闸安全等级为D级,需要采取治理措施,建议可结合水闸实际情况采取拆除重建、防渗、防洪加固等方法处理。

关键词： FEMCA法水闸安全复核

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人工智能在电子商务中的应用发展趋势研究

贵州社会科学 2019年第9期 136-143页

作者：孙克鲁泽霖中国信息通信研究院数字经济部北京100191 北京邮电大学北京100876

人工智能正逐步成为世界各国提高竞争力的驱动力之一,我国抓住人工智能发展机遇,制定人工智能战略规划支持人工智能的发展。基于深度学习的人工智能,成为电子商务行业发展的引擎。人工智能技术发展概况,人工智能在电子商务领域应用的系... 详细信息

人工智能正逐步成为世界各国提高竞争力的驱动力之一,我国抓住人工智能发展机遇,制定人工智能战略规划支持人工智能的发展。基于深度学习的人工智能,成为电子商务行业发展的引擎。人工智能技术发展概况,人工智能在电子商务领域应用的系统动力学模型,人工智能在提升交易效率、降低企业成本、提升用户服务体验等方面的作用机制。智能化工具、智能化服务、智能化采销、智能化仓储等已广泛应用于电子商务的各个环节。未来,基于需求导向的智能决策领域、基于全链条的系统优化领域、基于B2B的企业级应用领域等或将成为人工智能在电子商务中的重要发展方向。

关键词：人工智能电子商务作用机制应用场景发展趋势

High-efficiency prediction method for helicopter global/ground noise based on near-field acoustic holography

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Chinese Journal of Aeronautics 2024年第7期37卷 271-284页

作者： Mengxue SHAO Yang lu Xice XU Jiaxin lu National Key Laboratory of Helicopter Aeromechanics Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Noise reduction program design is an effective approach that relies on efficient noise prediction for reducing ground noise during *** existing noise prediction methods have the limitations of being computationally expensive or only applicable to *** this paper,a High-Efficiency Prediction Method(HEPM)for helicopter global/ground noise based on near-field acoustic holography is *** HEPM can predict the global noise based on acoustic modal analysis and has the advantages of high prediction accuracy and low time *** process is given as follows:firstly,the rotor noise on the holographic surface in the specified flight is obtained by simulations or ***,the global noise model,which maps time-domain noise to acoustic modes,is established based on near-field acoustic holography and Fourier acoustic analysis ***,combined with acoustic modal amplitude,the model established enables efficiently predicting the global/ground noise in the corresponding flight *** verify the accuracy of the prediction method,a simulation study is conducted in hovering and forward flight states using a model helicopter with a 2-meter rotor and Rotor Body Interaction(ROBIN)*** comparison of HEPM with numerical results shows that the average prediction errors of the global and ground noise are less than 0.3 dB and 0.2 dB,*** a region containing 100000 observers,the computation time of the HEPM is only one-fifth of that of the acoustic hemisphere method,demonstrating the rapidity of the proposed method.

关键词： Helicopter Rotor noise prediction Noise abatement procedure design Acoustic modal analysis Near-field acoustic holography

Optical grade (Gd_(0.95-x)lu_(x)Eu_(0.05))_(3)Al_(5)O_(12) ceramics with near-zero optical loss: Effects of lu^(3+) doping on structural feature, microstructure evolution, and far-red luminescence

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Journal of Advanced Ceramics 2024年第1期13卷 113-123页

作者： Zhigang Sun Ji-Guang Li Huiyu Qian Yoshio Sakka Tohru SSuzuki Bin lu School of Materials Science and Chemical Engineering Ningbo UniversityNingbo 315211China Research Center for Electronic and Optical Materials National Institute for Materials ScienceIbaraki 305-0044Japan Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province Ningbo 315211China

A chemical co-precipitation strategy was employed to synthesize a series of(Gd_(0.95−x)lu_(x)Eu_(0.05))_(3)Al_(5)O_(12)(x=0.1−0.95)powder phosphors,followed by vacuum sintering to achieve transparent garnet ceramic *** density functional theory indicated lu_(3)Al_(5)O_(12) was formed in priority compared with Gd_(3)Al_(5)O_(12) during solid-phase *** high-temperature sintering,the lu^(3+)substitution for Gd^(3+)suppressed point mass diffusion leading to a smaller grain *** in-line transmittances of bulk specimens with x=0.1,0.3,0.5,0.7,and 0.95 nm were~83.5%,80.1%,68.8%,73.7%,and 82.2%at 710 nm(Eu^(3+)emission center),respectively,among which the sample of x=0.1 exhibited the optical grade with near-zero optical loss in agreement with the defect-free single crystal(~100%of the theoretical transmittance).The resulting particle and ceramic materials both presented characteristic Eu^(3+)emission arising from 5D0→7FJ(J=1−4)transition,where the dominant far-red emission at~710 nm arising from ^(5)D_(0)→^(7)F_(4) transition overlapped with the absorption of phytochrome(PFR).The photoluminescence excitation and photoluminescence intensities of(Gd_(0.95−x)lu_(x)Eu_(0.05))_(3)Al_(5)O_(12) powders and ceramics generally increased at a higher Gd^(3+)/lu^(3+)***^(3+)dopants delayed the fluorescence lifetime while the bulk samples had shorter lifetime compared to the particle *** transparent(Gd_(0.85)lu_(0.1)Eu_(0.05))3Al_(5)O_(12) ceramic phosphor exhibited good thermal stability with a high thermal quenching temperature above 533 *** designed ceramic phosphor-converted light-emitting diode had a saturation injection current of 435 mA and a current-dependent color rendering *** importantly,our report marked the developmental stage of transparent ceramic materials towards zero optical loss.

关键词： transparent ceramics garnet phosphors light-emitting diode(LED) optical properties Gibbs free energy

Collective Molecular Machines: Multidimensionality and Reconfigurability

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Nano-Micro Letters 2024年第8期16卷 309-340页

作者： Bin Wang Yuan lu Department of Chemical Engineering Tsinghua UniversityBeijing 100084People’s Republic of China Key Laboratory of Industrial Biocatalysis Ministry of EducationTsinghua UniversityBeijing 100084People’s Republic of China

Molecular machines are key to cellular activity where they are involved in converting chemical and light energy into efficient mechanical *** the last 60 years,designing molecular structures capable of generating unidirectional mechanical motion at the nanoscale has been the topic of intense *** progress has been made,attributed to advances in various fields such as supramolecular chemistry,biology and nanotechnology,and ***,individual molecular machines are only capable of producing nanometer work and generally have only a single *** order to address these problems,collective behaviors realized by integrating several or more of these individual mechanical units in space and time have become a new *** this review,we comprehensively discuss recent developments in the collective behaviors of molecular *** particular,collective behavior is divided into two *** is the appropriate integration of molecular machines to efficiently amplify molecular motions and deformations to construct novel functional *** other is the construction of swarming modes at the supramolecular level to perform nanoscale or microscale *** discuss design strategies for both modes and focus on the modulation of features and ***,in order to address existing challenges,the idea of transferring experience gained in the field of micro/nano robotics is presented,offering prospects for future developments in the collective behavior of molecular machines.

关键词： Molecular machines Collective control Collective behaviors DNA Biomolecular motors

Soil inorganic amendments produce safe rice by reducing the transfer of Cd and increasing key amino acids in brown rice

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Journal of Environmental Sciences 2024年第2期136卷 121-132页

作者： Fanyi Kong Shenggao lu Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment Key Laboratory of Environmental Remediation and Ecosystem HealthMinistry of EducationCollege of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China

The digestibility of cadmium(Cd)in brown rice is directly related to amino acid metabolism in rice and human *** our field study,three kinds of alkaline calcium-rich soil inorganic amendments(SIAs)at three dosages were applied to produce safe rice and improve the quality of rice in Cd-contaminated *** the increased application of SIA,Cd content in iron plaque on rice root significantly increased,the transfer of Cd from rice root to grain significantly decreased,and then Cd content in brown rice decreased *** vitro digestibility of Cd in brown rice was estimated by a physiologically based extraction *** showed that more than 70%of Cd in brown rice could be digested by simulated gastrointestinal *** on the total and digestible Cd contents in brown rice to evaluate the health risk,the application of 2.25 ton SIA/ha could produce safe rice in acidic slightly Cd-contaminated paddy *** amino acids(AAs)in brown rice were determined by high-performance liquid *** contents of 5 key AAs(KAAs)that actively respond to environmental changes increased significantly with the increased application of *** structural equation model indicated that KAAs could be affected by the Cd translocation capacity from rice root to grain,and consequently altered the ratio of indigestible Cd in brown *** formation of indigestible KAAs-Cd complexes by combining KAAs(phenylalanine,leucine,histidine,glutamine,and asparagine)with Cd in brown rice could be considered a potential mechanism for reducing the digestibility of Cd.

关键词： Cadmium digestibility Soil inorganic amendments Safe rice Amino acid Priming effect Health risk

On the Monge–Kantorovich Mass Transfer Problem in Higher Dimensions

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Acta Mathematica Sinica,English Series 2024年第8期40卷 1989-2004页

作者： Xiao Jun lu School of Mathematics Southeast UniversityNanjing 210096P.R.China

This paper mainly investigates the approximation of a global maximizer of the Monge–Kantorovich mass transfer problem in higher dimensions through the approach of nonlinear partial differential equations with Dirichlet *** an approximation mechanism,the primal maximization problem can be transformed into a sequence of minimization *** applying the systematic canonical duality theory,one is able to derive a sequence of analytic solutions for the minimization *** the final analysis,the convergence of the sequence to an analytical global maximizer of the primal Monge–Kantorovich problem will be demonstrated.

关键词： Monge-Kantorovich mass transfer singular variational problem canonical duality theory