检索结果-南通市图书馆

Elucidating and manipulating pressure-induced water intrusion–extrusion in tunable hydrophobic Co/Zn bimetallic ZIFs:Roles of pore size and hydrogen bond

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第1期17卷 344-353页

作者： Diyi Fang Chuanlei Liu Yu Chen Qilong Peng Kongguo wu Yuxiang Chen Hao Jiang Yuan wu Benxian Shen Qiumin wu Di wu Hui Sun International Joint Research Center of Green Energy Chemical Engineering School of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China Alexandra Navrotsky Institute for Experimental Thermodynamics The Gene and Linda Voiland School of Chemical Engineering and BioengineeringMaterials Science and Engineeringand Department of ChemistryWashington State UniversityWashington 99163USA

Porous heterogeneous lyophobic systems(HLSs)find potential applications in energy restoring,dissipating,and ***,the development of controllable HLSs still lacks rational structure design of nanoporous materials matching the molecular sizes of adopted *** that,thoroughly understanding the underlying transportation mechanism in the confined nano channels is greatly *** this work,a series of Co/Zn bimetallic zeolitic imidazolate frameworks(ZIFs)with tunable structures were synthesized via regulating the Co to Zn ratios and employed to investigate the intrusion–extrusion of liquid water in confined *** characterizations confirm the heterometallic coordination in the Co/Zn-doped *** intrusion–extrusion experiments unlock the relationship between the intrusion pressure and the nanopore size and realize the evolution of the HLSs between molecular spring and *** addition,cycling tests indicate the reversible structure change of Co/Zn ZIFs encountering pressure-induced water *** combination with molecular dynamics simulations,we present that the water multimers intrude into nanopores of ZIFs in chain-like forms along with dissociation of hydrogen bonds(HBs).Water molecules in the pre-intrusion state exhibit reduced HBs in response to the increase of pressure and linear structure with 1.6–3.0 HBs on *** transition to the post-intrusion situation,the associative configuration of water tends to exhibit the tetrahedral ***,we highlight the roles of pore size and HB in synergically dominating the pressure-induced intrusion–extrusion of liquid water in hydrophobic ***,the present work can also guide the development of functional guest–host systems based on porous architectures.

关键词： heterometallic zeolitic imidazolate frameworks nanopore intrusion hydrogen bonds

Safety-Critical Trajectory Tracking for Mobile Robots With Guaranteed Performance

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2024年第9期11卷 2033-2035页

作者： Wentao wu Di wu Yibo Zhang Shukang Chen Weidong Zhang Department of Automation Shanghai Jiao Tong UniversityShanghai 200240China Department of Information and Communication Engineering Hainan UniversityHaikou 570288China

Dear Editor,This letter considers a collision-free trajectory tracking problem for performance-guaranteed mobile robots(MRs)subject to *** propose a safety-critical performance-guaranteed trajectory tracking method based on control barrier functions(CBFs).First,an auxiliary system is established to generate the non-negative signals for inflexible bounds such that the performance constraints are not violated when avoiding obstacles.

关键词： constraints bounds collision

在线全文

学校读者我要写书评

暂无评论

含焦宝石的陶瓷支撑剂的制备及性能

中国粉体技术 2010年第3期16卷 78-81页

作者：赵俊严春杰栾英伟吴红丹中国地质大学材料科学与化学工程学院湖北武汉430074

以铝矾土和焦宝石为原料,以锰粉为烧结助剂,制备高强度低密度支撑剂,并对相关性能进行研究。结果表明:随着铝矾土和焦宝石制备的陶瓷支撑剂配方中铝含量的不同,其最佳烧结温度范围略有不同,最佳的烧结时间也存在差异。在微观结构上,陶... 详细信息

以铝矾土和焦宝石为原料,以锰粉为烧结助剂,制备高强度低密度支撑剂,并对相关性能进行研究。结果表明:随着铝矾土和焦宝石制备的陶瓷支撑剂配方中铝含量的不同,其最佳烧结温度范围略有不同,最佳的烧结时间也存在差异。在微观结构上,陶粒的强度主要由刚玉骨架提供,当铝含量降低时,陶粒中虽然会出现部分莫来石相,但并不会影响其性能,说明低铝含量铝矾土可用于制备刚玉-莫来石质陶粒支撑剂。

关键词：陶瓷支撑剂烧结温度焦宝石强度

在线全文

学校读者我要写书评

暂无评论

类射影对应圆束法构成重虚圆点四次曲线

工程图学学报 2000年第1期21卷 10-13页

作者：边欣吴红丹中国农业大学东校区

定义了类射影对应圆束的概念，证明了类射影对应圆束的交点轨迹是重虚圆点四次曲线，给出了具体的实例及由计算机绘制的图形。

关键词：类射影对应圆束重虚圆点四次曲线计算机绘图

在线全文

学校读者我要写书评

暂无评论

二氧化硅复合膜的制备及其渗透汽化性能

硅酸盐学报 2020年第4期48卷 592-598页

作者：吴红丹刘宏瑞刘晓宇周志辉杨建华李胜利武汉科技大学资源与环境工程学院武汉430081 冶金矿产资源高效利用与造块湖北省重点实验室武汉430081 精细化工国家重点实验室吸附与无机膜研究所辽宁大连116024

采用溶胶–凝胶法配制了掺杂Zr4+以及未掺杂的2种有机硅态溶胶,以浸渍提拉的方式在已修饰的α-Al2O3载体上逐层涂布2种溶胶,并经过煅烧固化制备了二氧化硅复合膜。采用扫描电子显微镜对制备过程中的每一膜层表面形态结构进行表征。将二... 详细信息

采用溶胶–凝胶法配制了掺杂Zr4+以及未掺杂的2种有机硅态溶胶,以浸渍提拉的方式在已修饰的α-Al2O3载体上逐层涂布2种溶胶,并经过煅烧固化制备了二氧化硅复合膜。采用扫描电子显微镜对制备过程中的每一膜层表面形态结构进行表征。将二氧化硅复合膜应用于渗透汽化脱水,考察了不同温度以及不同进料含水率下的渗透汽化性能,并探究了强酸性环境(pH=2)对其性能的影响。实验结果表明:二氧化硅复合膜在75℃对85%(质量分数)异丙醇溶液渗透汽化脱水,其通量可达1 kg/(m2·h),渗透液含水率(质量分数)最高可到99.4%;在不同温度和含水率的条件下,二氧化硅复合膜都能保持良好的分离性能,具有良好的水热稳定性;长时间在强酸性环境(pH=2)中仍能保持稳定的分离性能,具有极强的耐酸性能。

关键词：溶胶–凝胶法二氧化硅复合膜渗透汽化

在线全文

学校读者我要写书评

暂无评论

地质聚合物发泡材料的制备和性能

非金属矿 2015年第6期38卷 11-14页

作者：陈洁渝王源慧雷新荣吴红丹中国地质大学材料科学与化学学院湖北武汉430074

以偏高岭土基地质聚合物为基体,以双氧水和十二烷基磺酸钠为混合发泡剂,制备出地质聚合物发泡材料。研究了发泡剂添加量、水分添加量及固化温度对地质聚合物发泡材料性能的影响。实验结果表明,发泡剂的添加量对该多孔材料的性能影响最大... 详细信息

以偏高岭土基地质聚合物为基体,以双氧水和十二烷基磺酸钠为混合发泡剂,制备出地质聚合物发泡材料。研究了发泡剂添加量、水分添加量及固化温度对地质聚合物发泡材料性能的影响。实验结果表明,发泡剂的添加量对该多孔材料的性能影响最大,其次为固化温度,水分含量影响最小。当发泡剂的添加量为3.5%,水分添加量为18%,固化温度为40℃,所得地质聚合物发泡材料性能优良,其孔隙率为76%,孔径小于0.5 mm,体积密度为0.3949 g/cm3,抗压强度为1.45 MPa,在轻质耐火保温建筑材料市场上具有很大的潜力。

关键词：偏高岭土地质聚合物发泡材料制备性能

Numerical simulation of fluid-thermal-structural coupling characteristics of stratospheric non-rigid airship

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第9期37卷 224-236页

作者： Huafei DU Mingyun LYU Chuan YU Yifei wu Yongmei wu Kangwen SUN School of Aeronautic Science and Engineering Beihang UniversityBeijing 100191China Linzhou(Ningbo)Technology Co.Ltd Yuyao 315042China

The voluminous stratospheric non-rigid airship is very sensitive to the external thermal *** temperature change of internal gas caused by the variation in the external ther-mal environment and wind speed will lead to a change in the shape and buoyancy of the airship,thereby affecting its flight *** traditional static analysis method is difficult to accurately reflect this fuid-thermal-structural coupling *** this paper,the iterative analysis method was established for the fluid-thermal-structural coupling effect of stratospheric non-rigid airship based on the models of fluid,thermal,and structural *** the load such as the internal thermal effect and external flow field of the airship,the simulation of the thermo-induced structural deformation effect was conducted using Fluent and Abaqus *** influ-ence of local time and external wind speed on the structural deformation,volume,and equilibrium altitude of the airship was *** results demonstrate that,at low wind speed,the influence of aerodynamic pressure on the deformation of the airship is ***,a great amount of heat is carried away by the wind,then the structural deformation caused by internal and external pressure difference is alleviated and the equilibrium altitude of the airship change *** can serve as a guideline for the design and flight test of the long-endurance stratospheric non-rigid airship.

关键词： Altitude change Fluid-thermal-structural coupling Stratospheric non-rigid airship Structural deformation Wind speed

Flotation separation of scheelite from calcite using luteolin as a novel depressant

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 462-472页

作者： Xiaokang Li Ying Zhang Haiyang He Yu wu Danyu wu Zhenhao Guan Faculty of Land and Resources Engineering Kunming University of Science and TechnologyKunming 650093China State Key Laboratory of Clean Utilization of Complex Non-Ferrous Metal Resources Kunming University of Science and TechnologyKunming 650093China

This paper proposes luteolin(LUT)as a novel depressant for the flotation-based separation of scheelite and calcite in a sodium oleate(NaOL)*** suitability of LUT as a calcite depressant is confirmed through micro-flotation *** pH=9,with LUT concentration of 50 mg·L^(-1) and NaOL concentration of 50 mg·L^(-1),scheelite recovery reaches 80.3%.Calcite,on the other hand,exhibits a recovery rate of 17.6%,indicating a significant difference in floatability between the two ***,the surface modifica-tions of scheelite and calcite following LUT treatment are characterized using adsorption capacity testing,Zeta potential analysis,Fourier transform infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),and atomic force microscopy(AFM).The study in-vestigates the selective depressant mechanism of LUT on *** capacity testing and Zeta potential analysis demonstrate sub-stantial absorption of LUT on the surface of calcite,impeding the further adsorption of sodium oleate,while its impact on scheelite is ***-IR and XPS analyses reveal the selective adsorption of LUT onto the surface of calcite,forming strong chemisorption bonds between the hydroxyl group and calcium ions *** directly illustrates the distinct adsorption densities of LUT on the two miner-al ***,LUT can effectively serve as a depressant for calcite,enabling the successful separation of scheelite and calcite.

关键词： scheelite calcite luteolin flotation depressant separation

Graph neural network-based scheduling for multi-UAV-enabled communications in D2D networks

在线全文

学校读者我要写书评

暂无评论

Digital Communications and Networks 2024年第1期10卷 45-52页

作者： Pei Li Lingyi Wang Wei wu Fuhui Zhou Baoyun Wang Qihui wu Nanjing University of Posts and Telecommunications Nanjing210023China Nanjing University of Aeronautics and Astronautics Nanjing210016China

In this paper,we jointly design the power control and position dispatch for Multi-Unmanned Aerial Vehicle(UAV)-enabled communication in Device-to-Device(D2D)*** objective is to maximize the total transmission rate of Downlink Users(DUs).Meanwhile,the Quality of Service(QoS)of all D2D users must be *** comprehensively considered the interference among D2D communications and downlink *** original problem is strongly non-convex,which requires high computational complexity for traditional optimization *** to make matters worse,the results are not necessarily globally *** this paper,we propose a novel Graph Neural Networks(GNN)based approach that can map the considered system into a specific graph structure and achieve the optimal solution in a low complexity ***,we first construct a GNN-based model for the proposed network,in which the transmission links and interference links are formulated as vertexes and edges,***,by taking the channel state information and the coordinates of ground users as the inputs,as well as the location of UAVs and the transmission power of all transmitters as outputs,we obtain the mapping from inputs to outputs through training the parameters of *** results verified that the way to maximize the total transmission rate of DUs can be extracted effectively via the training on ***,it also shows that the performance of proposed GNN-based method is better than that of traditional means.

关键词： Unmanned aerial vehicle D2 Dcommunication Graph neural network Power control Position planning