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消费者信息偏好对船公司参与航运物流区块链平台决策的影响

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控制与决策 2024年第8期39卷 2791-2800页

作者：陈燕婷李登峰福州大学经济与管理学院福州350108 电子科技大学经济与管理学院成都611731

航运物流行业涉及多个环节,因此航运物流区块链平台需要多个物流企业积极加入.航运物流区块链平台应用下的航运物流信息披露水平和消费者偏好都会对物流企业的参与决策产生影响.基于消费者存在航运物流服务和信息偏好以及船公司可选择... 详细信息

航运物流行业涉及多个环节,因此航运物流区块链平台需要多个物流企业积极加入.航运物流区块链平台应用下的航运物流信息披露水平和消费者偏好都会对物流企业的参与决策产生影响.基于消费者存在航运物流服务和信息偏好以及船公司可选择参与已搭建好的航运物流区块链平台(简称“上链”)的假设,利用两阶段博弈刻画了航运物流信息披露下的两个船公司的博弈均衡,进而通过对比3种“上链”模式,分析船公司的“上链”决策.研究发现,当消费者更关注航运物流服务水平时,与都“上链”相比,两个船公司都“不上链”能使双方获益,且披露航运物流信息和虚报舱位数量多的船公司获益更多;若仅有一个船公司“上链”,其收益最大.当消费者更关注航运物流信息披露水平时,若两个船公司都“上链”,能实现共赢,且船公司披露的航运物流信息水平越高收益越大.同样,若仅有一个船公司“上链”,其收益最大.研究结论能够为航运物流企业应用区块链技术提供有益的管理启示.

关键词：区块链物流供应链激励信息偏好博弈论

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代码共享协议选择非合作-合作两型博弈模型

管理科学学报 2024年第2期27卷 49-68页

作者：李登峰江彬倩电子科技大学经济与管理学院成都611731 福州理工大学管理学院福州350118

代码共享是航空公司之间一种普遍的有效合作方式,而达成代码共享协议是代码共享机票定价以及代码共享航空公司获利的前提.由于自由销售代码共享协议与利润共享机制缺乏相关研究,本文着重研究了利润共享机制下自由销售代码共享协议优化... 详细信息

代码共享是航空公司之间一种普遍的有效合作方式,而达成代码共享协议是代码共享机票定价以及代码共享航空公司获利的前提.由于自由销售代码共享协议与利润共享机制缺乏相关研究,本文着重研究了利润共享机制下自由销售代码共享协议优化选择问题.首先提出了辐条模型可以更贴近地描述现实中乘客对航空公司的偏好,其次构建一种融通非合作博弈与合作博弈于一体的非合作-合作两型博弈模型.在非合作博弈部分,航空公司从各自角度出发考虑所有可能的代码共享协议,即形成各种竞争局势;在合作博弈部分,代码共享航空公司通过机票联合定价可分得利润,而竞争局势需要根据航空公司所得利润才能进行比较.所构建的非合作-合作两型博弈模型的显著特点包括:在非合作博弈部分航空公司无法事先估计其在各种竞争局势下的利润,而在不同竞争局势下合作博弈部分的最大航空联盟是不同的,且任意航空子联盟具有外部性.针对最大航空联盟有可能分裂的情形,本文利用Shapley值与两步Shapley值作为合作博弈部分的利润分配方法.通过数值实验,验证了所建非合作-合作两型博弈模型与解法的有效性,并从对比结果中可以发现,利润共享机制下自由销售代码共享协议具有显著优势,特别是在只包含一家较知名航空公司的航空市场中.研究成果可为优化代码共享协议选择与提升社会总福利提供重要理论与方法支持.

关键词：自由销售代码共享协议利润共享机制非合作-合作两型博弈辐条模型机票定价

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实l^(2)上相位恢复的一些结果

数学的实践与认识 2024年第5期54卷 190-197页

作者：张芳馨郑仟李登峰武汉纺织大学数理科学学院湖北武汉430200

考虑实l^(2)上相位恢复问题.首先给出实l^(2)上相位恢复的条件,包括充分条件、必要条件及充要条件;其次讨论实l^(2)上范数恢复问题及实l^(2)上有限个投影恢复问题,也给出与框架相关的范数恢复结论.

关键词：相位恢复范数恢复投影相位恢复

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深海沉积物中稀土元素的富集成矿作用

矿物岩石地球化学通报 2024年第1期43卷 79-89页

作者：付宇孙晓明李登峰李政坤彭锦洲黄菲梁泳嘉汤雅月王睿中山大学海洋科学学院广东省海洋资源与近岸工程重点实验室中山大学地球科学与工程学院广东珠海519082

我国虽是稀土大国,但重稀土仍是十分紧缺的关键金属资源。2011年日本学者Kato等在太平洋深海盆地中发现了大规模富含稀土元素的沉积物,引起世界各国高度重视。深海富稀土沉积物广泛分布于海底,其富集稀土元素尤其是相对富集重稀土元素... 详细信息

我国虽是稀土大国,但重稀土仍是十分紧缺的关键金属资源。2011年日本学者Kato等在太平洋深海盆地中发现了大规模富含稀土元素的沉积物,引起世界各国高度重视。深海富稀土沉积物广泛分布于海底,其富集稀土元素尤其是相对富集重稀土元素等关键金属,是继大洋结核结壳、洋中脊热液硫化物、天然气水合物之后一种重要的海洋矿产资源。目前太平洋和印度洋中都证实有大面积富稀土沉积物的存在,我国科学家将深海稀土资源分为4个主要成矿远景区,其中太平洋3个,印度洋1个。富稀土沉积物的矿物组分主要包括生物成因磷灰石(鱼牙和鱼骨)、微结核(铁锰氧化物或氢氧化物)、沸石、黏土矿物等,其中生物磷灰石是最重要的稀土载体。稀土元素直接来源于上覆海水和孔隙水,热液和火山活动可能也有贡献。水深、沉积速率和氧化还原环境等是控制深海稀土元素富集的重要因素,强底流、海底火山和热液活动以及气候事件所导致的陆源输入的变化也会对深海稀土富集产生重要影响。深海稀土成矿作用仍然存在一些尚未解决的科学问题,需进一步加强深海富稀土沉积物成因及超常富集机制等的研究,以丰富和完善深海稀土的成矿模型,为我国在深海稀土富集区的勘探研究与实践提供重要借鉴。

关键词：深海沉积物稀土元素生物磷灰石微结核富集规律成矿作用

Synergistic effect of cobalt and niobium in Co_(3)-Nb-O_(x)on performance of selective catalytic reduction of NO with NH_(3)

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Rare Metals 2022年第1期41卷 166-178页

作者： Bo-lin Zhang li-feng deng Bo liu Chun-Yun Luo Michael liebau Shen-Gen Zhang Roger Glaser Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Shunde Graduate School University of Science and Technology BeijingFoshan 528399China Jiangsu Longkingcotech Co. Ltd.Yancheng 224000China Institute of Chemical Technology Universita¨t LeipzigLeipzig 04103Germany e-mail:roger.glaeser

Combining the redox properties of Co and the acid properties of Nb in a Co_(3)-Nb-O_(x)catalyst is shown to provide superior performance in the selective catalytic reduction of NO with NH_(3)(NH_(3)-SCR).Co_(3)O_(4)shows average activity,however,it exhibits a poor N_(2)***_(2)O_(5)is not active for NH_(3)-***,the mixed Co_(3)-Nb-O_(x) catalyst shows higher NO conversion and N_(2)selectivity than the single Co_(3)O_(4)and Nb_(2)O_(5)catalysts at 100–300℃.The results of temperature programmed reduction by H_(2)and X-ray photoelectron(XP)spectra indicate that the addition of Nb changes the chemical states of Co and decreases the concentration of Co^(3+) and Oa,adjusting the activity for catalytic oxidation to a moderate *** suppresses the formation of undesired N_(2)O from the over-oxidation of NH_(3).Incorporation of Co and Nb into one solid synergistically couples their redox behavior and surface acidity,ensuring the high catalytic activity and N2 selectivity in NH3-SCR.

关键词： Co-Nb Selective catalytic reduction Lowtemperature Acid property Redox behavior

Visible light Indoor Positioning System Based on Pisarenko Harmonic Decomposition and Neural Network

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Chinese Journal of Electronics 2024年第1期33卷 195-203页

作者： li ZHAO Yi REN Qi WANG Lange deng feng ZHANG School of Electronic Information Engineering Xi’an Technological University

Visible-light indoor positioning is a new generation of positioning technology that can be integrated into smart lighting and optical communications. The current received signal strength(RSS)-based visible-light positioning systems struggle to overcome the interferences of background and indoor-reflected noise. Meanwhile, when ensuring the lighting, it is impossible to use the superposition of each light source to accurately distinguish light source information; furthermore, it is difficult to achieve accurate positioning in complex indoor environments. This study proposes an indoor positioning method based on a combination of power spectral density detection and a neural network. The system integrates the mechanism for visible-light radiation detection with RSS theory, to build a back propagation neural network model fitting for multiple reflection channels. Different frequency signals are loaded to different light sources at the beacon end, and the characteristic frequency and power vectors are obtained at the location end using the Pisarenko harmonic decomposition method. Then, a complete fingerprint database is established to train the neural network model and conduct location tests. Finally, the location effectiveness of the proposed algorithm is verified via actual positioning experiments. The simulation results show that, when four groups of sinusoidal waves with different frequencies are superimposed with white noise, the maximum frequency error is 0.104 Hz and the maximum power error is 0.0362 W. For the measured positioning stage, a 0.8 m × 0.8 m × 0.8 m solid wood stereoscopic positioning model is constructed, and the average error is 4.28 cm. This study provides an effective method for separating multi-source signal energies, overcoming background noise, and improving indoor visible-light positioning accuracies.

关键词： Neural networks Measurement uncertainty Position measurement Harmonic analysis light emitting diodes Frequency estimation Indoor positioning systems

Structural and Electronic Properties of Sulfur-Passivated InAs(001) ( 2×6 ) Surface

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Chinese Physics Letters 2011年第8期28卷 236-239页

作者： li deng-feng GUO Zhi-Cheng li Bo-lin DONG Hui-Ning XIAO Hai-Yan Department of Mathematics and Physics Chongqing University of Posts and TelecommunicationsChongqing 400065 Department of Applied Physics University of Electronic Science and Technology of ChinaChengdu 610054

The structural and electronic properties of S-passivated InAs(001)-(2×6)and InAs(001)−(2×1)surfaces are studied by first−principles total-energy *** on the calculated adsorption energies and electronic properties,we propose that the reconstruction of a S-treated InAs(001)surface should be InAs(001)–(2×6)S rather than InAs(001)−(2×1)*** is similar to the adsorption behavior of S on a GaAs(001)*** Fermi level of an InAs(001)−(2×6)S surface exists above the conduction band minimum by 371 meV and the energy gap becomes 0.145 eV smaller than the clean surface.A strong surface electron accumulation layer is formed and downward band bending is increased,which is in good agreement with recent experiments.

关键词： surface adsorption

Diffusion of nanochannel-confined knot along a tensioned polymer

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Communications in Theoretical Physics 2024年第4期76卷 158-166页

作者： Guobing Cai Yong li Yuyu feng Zhouhui deng Yanhui liu College of Physics Guizhou UniversityGuiyang 550025China Kechuang Industrial Development Company limited Guian New AreaGuiyang 550025China State Key Laboratory of Public Big Data Guizhou UniversityGuiyang 550025China

The knots frequently occur in biopolymer and their diffusion plays an active role in the gene *** this work,Langevin dynamics simulations were carried out to detect the diffusion behaviours of a knot along a tensioned polymer in different spatial *** polymer accommodating a knot was tethered to two macrospheres to block the unravelling of the *** a result,the curves for the diffusion coefficients of the knot with different bending stiffness as a function of the tension in different spatial constraints were *** the space without constraints or with weak constraints,the corresponding curves for the knot with relatively large bending stiffness exhibited two turnover *** the contrary,for the knot with relatively small bending stiffness,the diffusion coefficients were monotonically reduced with increasing ***,in a space with strong constraints,all the curves showed one turnover behaviour regardless of the bending *** turnover behaviours divided the curves into different regimes,and the dominant diffusion mechanisms in the regimes,namely,knot-region breathing,self-reptation,and internal friction,were clearly *** effective friction coefficientsξof the knots with 3_(1),4_(1),5_(1) and 5_(2) types as a function of the knot size N at a fixed tension were well fitted by the relationξ∝*** effective friction coefficients of the knots at relatively large tension f>3 sharply increased with the knot complexity,which is not dependent on the spatial *** contrast,the values of these coefficients at relatively small tension f≤3 were remarkably dependent on the spatial *** work not only provides valuable simulation results to assist the understanding of the diffusion of DNA knot,but also highlights the single-molecule design for the manipulation of DNA knots in future.

关键词： knot langevin dynamics simulations diffusion coefficient self-reptation knot-region breathing internal friction

Mutation in the Agrobacterium his I gene enhances transient expression in pepper

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Horticultural Plant Journal 2024年第3期10卷 809-822页

作者： Dan liu Shengnan Zhao Jubin Wang Xi Zhang Yingtian deng feng li National Key Laboratory for Germplasm Innovation&Utilization of Horticultural Crops College of Horticulture and Forestry SciencesHuazhong Agricultural UniversityWuhanHubei 430070China

Agrobacterium-mediated plant transformation is widely used in plant genetic ***,its efficiency is limited by plant immunity against *** pepper(Capsicum annuum L.)is an important vegetable that is recalcitrant to Agrobacterium-mediated *** this work,Agrobacterium was found to induce a strong immune response in pepper,which might be the reason for T-DNA being difficult to express in *** Agrobacterium mutant screen was conducted and a point mutation in the hisI gene was identified due to a weak immune response and enhanced transient expression mediated by this Agrobacterium mutant in pepper *** genetic analysis revealed that histidine biosynthesis deficiency caused by mutations in many genes of this pathway led to reduced pepper cell death,presumably due to reduced bacterial ***,mutation analysis of threonine and tryptophan biosynthesis genes showed that the biosynthesis of different amino acids may play different roles in Agrobacterium growth and stimulating the pepper immune *** possible application of Agrobacterium amino acid biosynthesis mutations in plant biology was discussed.

关键词： Capsicum annuum L. Agrobacterium Transient transformation efficiency Mutation Amino acid Immune response