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Atomically dispersed materials:Ideal catalysts in atomic era

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Nano Research 2024年第1期17卷 18-38页

作者： Tao gan Dingsheng Wang Department of Chemistry Tsinghua UniversityBeijing 100084China

Catalysts can accelerate the chemical reaction rate and effectively promote the molecules transformation,which is of great significance in the research of chemical industry and material *** extreme utilization of reactive sites has led to the emergence and development of atomically dispersed materials(ADMs).The highly active coordination unsaturated metal sites and fully utilized metal atoms make ADMs show great potential in catalytic *** adjustment of coordination environment and electronic structure provides more possibilities for constructing reactive centers with different *** review summarized the application and research progress of ADMs in different *** design strategy and structure–activity relationship of ADMs for specific reactions were summarized and ***,we also provided advices for the challenges and opportunities faced by ADMs in catalytic reactions.

关键词： atomically dispersed materials catalysis organic synthesis battery sensor enzyme

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层理影响下油页岩力学性质与破坏断裂特征

煤炭技术 2025年第1期44卷 57-62页

作者：甘泽李富平杨曦甘德清华北理工大学矿业工程学院河北唐山063210 河北省矿业开发与安全技术实验室河北唐山063210

为明确层理角度对油页岩力学性质与破坏断裂特征的影响,选取0°、60°和90°层理角度油页岩试样,对其开展单轴压缩实验、场应变与声发射监测。研究发现:水平层理会使油页岩的压密阶段更为显著。垂直层理、60°层理和水平层理油页岩的破... 详细信息

为明确层理角度对油页岩力学性质与破坏断裂特征的影响,选取0°、60°和90°层理角度油页岩试样,对其开展单轴压缩实验、场应变与声发射监测。研究发现:水平层理会使油页岩的压密阶段更为显著。垂直层理、60°层理和水平层理油页岩的破坏模式分别为劈裂型的剪切-张拉破坏、剪切破坏和穿层劈裂破坏。垂直层理油页岩容易形成多条平行应变集中条带;60°层理角度油页岩更容易在截切面形成主要应变集中条带;水平层理油页岩应变集中条带主要沿着水平层理分布,并在水平应变集中条带之间形成纵向的穿层应变集中条带。垂直层理试样的振铃计数表现为阶梯上升,水平层理与60°层理试样表现为振铃计数在破坏阶段的陡然增加。

关键词：油页岩层理应力应变曲线破坏模式主应变场声发射

Research progress in ionic liquids catalyzed isobutane/butene alkylation

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Chinese Journal of Chemical Engineering 2016年第11期24卷 1497-1504页

作者： Panxue gan Shengwei Tang Multi-phase Mass Transfer and Reaction Engineering Lab College of Chemical EngineeringSichuan University

The complicated reaction mechanism and the character of competitive reactions lead to a stringent requirement for the catalyst of C_4 alkylation process. Due to their unique properties, ionic liquids(ILs) are thought to be new potential acid catalysts for C_4 alkylation. An analysis of the regular and modified chloroaluminate ILs, novel Br?nsted ILs and composite ILs used in isobutane/butene alkylation shows that the use of either ILs or ILs coupled with mineral acid as homogeneous catalysts can help to greatly adjust the acid strength. By modifying the structural parameters of the cations and anions of the ILs, the solubility of the reactants could also be adjusted, which in turn displays a positive effect on improving the activity of ILs. Immobilization of ILs is an effective way to modulate the surface adsorption/desorption properties and acid strength distribution of the solid acid catalysts. Such a process has a tremendous potential to reduce the deactivation of catalyst and enhance the activity of the solid acid catalyst. The development of novel acid catalysts for C_4 alkylation is a comprehensive consideration of acid strength and its distribution, interfacial properties and transport characteristics.

关键词： Alkylation Isobutane Butenen Catalyst Ionic liquid

具有避障功能的农机自动作业全覆盖路径规划方法

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农机化研究 2025年第2期47卷 36-43页

作者：罗荣浩干熊杨光友湖北工业大学农机工程研究设计院武汉430068 湖北省农机装备智能化工程技术研究中心武汉430068

针对不同尺寸和类型障碍物条件下的农机车辆自动作业全覆盖路径规划问题,提出了静态全覆盖路径规划方法和路径优化方案。根据矩形田块信息、障碍物信息、农机最小转弯半径和机具宽度,自动选定作业方向、作业行距、地头转弯区域和转弯模... 详细信息

针对不同尺寸和类型障碍物条件下的农机车辆自动作业全覆盖路径规划问题,提出了静态全覆盖路径规划方法和路径优化方案。根据矩形田块信息、障碍物信息、农机最小转弯半径和机具宽度,自动选定作业方向、作业行距、地头转弯区域和转弯模式等参数;根据障碍物形状、高覆盖率高作业路径比的需求,对算法进行优化调整,以达到更好的作业效果。软件仿真测试结果表明:对有小矩形障碍物的田块,改进后的算法覆盖率提升了0.11%,重复率降低了0.71%;对大矩形障碍物的田块,两种分区路径的覆盖率分别为89.24%和98.08%,重复率分别为3.53%和2.84%。研究结果表明:算法提高了田块的利用率,降低了作业成本,能够有效避开大小障碍物,同时满足高覆盖率和低重复率的田间作业要求。

关键词：农机车辆路径规划算法自动作业避障

ACSL4,PUFA,and ferroptosis:new arsenal in anti-tumor immunity

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Signal Transduction and Targeted Therapy 2022年第5期7卷 1363-1365页

作者： Boyi gan Department of Experimental Radiation Oncology The University of Texas MD Anderson Cancer CenterHoustonTXUSA

In a recent study published in Cancer Cell,Liao et al.1 identified CD8+T-cell-derived interferon(IFN)γin combination with polyunsaturated fatty acids(PUFAs)as a natural ferroptosis inducer(FIN)to trigger tumor ferroptosis and promote anti-tumor immunity in an acyl-coenzyme A synthetase long-chain family member 4(ACSL4)-dependent *** refers to a form of regulated cell death triggered by excessive iron-dependent peroxidation of PUFA-containing phospholipids(PUFA-PLs)in the cellular membrane.

关键词： immunity peroxidation

Studies on structural safety in stochastically excited Duffing oscillator with double potential wells

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Acta Mechanica Sinica 2007年第5期23卷 577-583页

作者： Chunbiao gan Shimin He Institute of Applied Mechanics SAA Zhejiang University Hangzhou 310027 China College of Mechanical and Energy Engineering Zhejiang University Hangzhou 310027 China

The effects of the Gaussian white noise excitation on structural safety due to erosion of safe basin in Duffing oscillator with double potential wells are studied in the present paper. By employing the well-developed stochastic Melnikov condition and Monte-Carlo method, various eroded basins are simulated in deterministic and stochastic cases of the system, and the ratio of safe initial points （RSIP） is presented in some given limited domain defined by the system＇s Hamiltonian for various parameters or first-passage times. It is shown that structural safety control becomes more difficult when the noise excitation is imposed on the system, and the fractal basin boundary may also appear when the system is excited by Gaussian white noise only. From the RSIP results in given limited domain, sudden discontinuous descents in RSIP curves may occur when the system is excited by harmonic or stochastic forces, which are different from the customary continuous ones in view of the firstpassage problems. In addition, it is interesting to find that RSIP values can even increase with increasing driving amplitude of the external harmonic excitation when the Gaussian white noise is also present in the system.

关键词： Stochastic Dulling oscillator Basin erosion Structural safety Stochastic Melnikov condition RSIP

The effective hydrodynamic radius in the Stokes-Einstein relation is not a constant

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Communications in Theoretical Physics 2022年第9期74卷 177-182页

作者： gan Ren School of Science Civil Aviation Flight University of ChinaGuanghan 618307China

Variants based on the assumption of effective hydrodynamic radius being a constant are usually adopted to test the Stokes-Einstein(SE)*** rationality of the assumption is examined by performing molecular dynamics simulations with the truncated Lennard-Jones-like(TLJ)model,Kob-Andersen model and ortho-terphenyl(OTP)*** results indicate the assumption is generally not established except for special *** effective hydrodynamic radius is observed to increase with decreasing temperature for TLJ model but is decreased for Kob-Andersen and OTP model;and which is almost a constant for TLJ particle with enough *** variant of SE relation D~Th is invalid for the three models except for the TLJ particle with enough *** propose similar inconsistency may be also existed in other liquids and the assumption should be critically evaluated when adopted to test the SE relation.

关键词： Stokes-Einstein relation effective hydrodynamic radius Stokes’formula

Photonic crystal cavities and integrated optical devices

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Science China(Physics,Mechanics & Astronomy) 2015年第11期58卷 11-22页

作者： gan Lin LI ZhiYuan Laboratory of Optical Physics Institute of Physics Chinese Academy of Sciences

This paper gives a brief introduction to our recent works on photonic crystal(Ph C) cavities and related integrated optical structures and devices. Theoretical background and numerical methods for simulation of Ph C cavities are first presented. Based on the theoretical basis, two relevant quantities, the cavity mode volume and the quality factor are discussed. Then the methods of fabrication and characterization of silicon Ph C slab cavities are introduced. Several types of Ph C cavities are presented, such as the usual L3 missing-hole cavity, the new concept waveguide-like parallel-hetero cavity, and the low-index nanobeam cavity. The advantages and disadvantages of each type of cavity are discussed. This will help the readers to decide which type of Ph C cavities to use in particular applications. Furthermore, several integrated optical devices based on Ph C cavities, such as optical filters, channel-drop filters, optical switches, and optical logic gates are described in both the working principle and operation characteristics. These devices designed and realized in our group demonstrate the wide range of applications of Ph C cavities and offer possible solutions to some integrated optical problems.

关键词： photonic crystal cavities optical filter optical switch optical logic gates

Quantum Key Distribution Scheme with High Efficiency

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Communications in Theoretical Physics 2009年第5期51卷 820-822页

作者： GAO gan Department of Electrical Engineering Tongling University Tongling 244000 China

Based on entanglement swapping, a quantum key distribution （QKD） scheme is proposed. In this scheme, the secret keys are formed by comparing initial Bell states and outcomes of entanglement swapping. Moreover, all initial Bell states prepared by Alice and Bob are completely arbitrary. As the classical information exchanged between two parties is very little, this QKD scheme has a high efficiency. In addition, in order to prevent eavesdropping, decoy particles are used.

关键词： Bell state comparison entanglement swapping quantum key distribution