下载排行
Overview of high precision surface measurement for optical element with complex curved surface
LIU Bin;WANG Xiaokun;CHENG Qiang;LIU Zhongkai;LI Lingzhong;CAI Mengxue;ZHANG Luojia;LI Wenhan;WANG Jincheng;ZHANG Xuejun;The application of complex curved optical components in these systems enhances design flexibility, reduces the number of components required, and facilitates the miniaturization and lightweighting of optical systems.Celebrated as transformative elements in modern optical systems, these components find extensive applications in space optics, lithography systems, automotive lighting, and more, significantly advancing the development of aerospace, national defense, and high-tech civilian enterprises. However, the high surface shape precision required by complex curved optical components poses a challenge. The ability to conduct high-precision surface shape inspections to guide processing has become a bottleneck limiting the widespread application of such components. This paper categorizes and reviews the commonly used surface shape inspection methods for complex curved optical components.According to whether interference principle is adopted, the measurement methods are divided into two categories: non-interferometry and interferometry. It also looks back at the development of these methods, focusing on the characteristics of several typical methods for surface shape inspection, and anticipates future trends in the development of high-precision surface shape inspection technologies for complex curved optical components.
Application of ANSYS-Based Contact Analysis in Reinforced Concrete Sliding
LIU Yun-ping,BAO Hua,HONG Jun-qing,CHEN Guo-qing(School of Architecture Engineering,Nantong university,Nantong 226019,China)The paper introduced contact analysis of ANSYS including node to surface,node to node and surface to surface contacts through an example of finite element analysis of drawing-test of concrete and bar.And the model construction process of contact analysis was specified.The finite element contact analysis model of drawing-test of concrete and bar is constructed with surface to surface contact element.Anchorage length is solved by ANSYS and compared with value solved by Code for design of concrete structures.The sliding-result of ANSYS is coincident with the theoretical analysis and test.The result demonstrates that software of ANSYS is a good tool for sliding analysis of steel-concrete.
GIS-based Spatial Interpolation and Pollution Appraisal of Heavy Metal in Cropland Soil——A Case Study of Nantong in Jiangsu Province
WANG Jin Nantong Agriculture Bureau,Nantong 226006,China FENG Jin-fei BIAN Xin-min Nanjing Agricultural University,Nanjing 210095,ChinaIn this case study,data came from the survey on heavy metal pollution in Nantong,Jiangsu province.After comparing various methods of spatial interpolation,the paper adopted an appropriate model to conduct the spatial interpolation,from which the analysis of spatial distribution and the pollution appraisal of heavy mental in cropland soil in Nantong were derived.The findings indicate that dispersion of the sample data can affect the result of spatial interpolation.The widely dispersed data should be transformed to lower their dispersion degree.The area proportions of heavy metals Hg,As,Pb,Cd,and Cr were 2.75%,23.02%,68.24%,0.01%,and 5.59% respectively.The Pb pollution index in every city and county in Nantong surpassed 1.The As pollution index of Haimen,Nantong and Qidong surpassed 1.The combined pollution index of Nantong,Haimen and Qidong were being at the warning limit. The combined pollution index of Tongzhou was approaching the warning limit.
The Research on PEMFC and Its Application
HUANG Ming-yu1,NI Hong-jun1,ZHOU Yi-dan1,ZHU Yu1,LUO Bing2(1.Nantong University,Nantong 226007,China;2.Nanjing University of Science and Technology,Nanjing 210000,China)Faced with the crisis of energy and environment,proton exchange membrane fuel cell has a good prospect due to its characteristics and advantages.This paper introduces the application of PEMFC to various fields as well as its status quo.It also gives an analysis of cell material,cost and hydrogen energy and expounds a series of problems in PEMFC development which need to be solved.
Multi-UAV autonomous collision avoidance via deep reinforcement learning with CNN-LSTM fusion networks
LIANG Chengqing;LI Lei;LIU LeiAiming at the autonomous collision avoidance problem of multi-unmanned aerial vehicles(multi-UAVs) in complex environments, the proximal policy optimization(PPO) algorithm is adopted to investigate the autonomous collision avoidance strategy for multi-UAVs. Firstly, to address the problem of poor coordination during multi-UAVs collision avoidance, a CNN-LSTM fusion network incorporating convolutional neural network(CNN) and long shortterm memory(LSTM) network is designed by introducing LSTM to construct memory functionality. The fusion network fully utilizes the capability of CNN in feature extraction and the advantages of LSTM in processing sequential data, thereby improving the robustness of UAV decision-making. Secondly, a novel reward function is designed based on artificial potential field reward shaping technique. By designing a main reward combined with several auxiliary rewards, reward sparsity is effectively avoided. The mainline reward guides the UAV toward the predetermined target,while the auxiliary rewards encourage the UAV to take more flexible and robust actions, thus achieving more effective autonomous collision avoidance in complex environments. Finally, the algorithm is validated through simulations in both obstacle-free and obstacle environments. Simulation results demonstrate that the CLPPO algorithm based on CL fusion network effectively improves algorithm performance. In addition, comparative experiments and robustness tests under high-density UAV environments are conducted. The test results show that the algorithm exhibits excellent performance in terms of return and collision avoidance success rate.
Advances in the construction and application of chemiluminescence probes
FENG Yurong;XU Shuai;HUAN Shuangyan;YUAN Lin;ZHANG XiaobingIn the chemiluminescence process, when the luminescent system and the response substrate undergo a chemical reaction, the dye molecules in the system are excited by the chemical energy generated by the chemical reaction and generate light signals. Since the external excitation light source is not required, the interference of background fluorescence is avoided and the imaging contrast will be improved, making it have unique advantages in in vivo imaging.In addition, the chemiluminescence system can be used as an internal light source to excite the photosensitizer for tumor therapy. In this review, the current type of luminescence systems, including Luminol, peroxyoxalate, 1, 2-dioxetane chemiluminescence system, as well as their luminescence mechanism and structural characteristics are reviewed,and their application in imaging and therapy is summarized. Finally, the development direction of these systems is prospected, and it is revealed that the development of a long-wavelength, high-brightness chemiluminescence system with a new structure is an effective strategy to the improve bioimaging and therapeutic effects.
Preparation and Photocatalytic Properties of Nano TiO2/Nay Composite Photocatalyst
YANG Tingting;PAN Gangwei;JING XiaohuiThe major problems of TiO2 photocatalyst are easy aggregation and deactivation, and obvious difficulty in separation. In order to overcome some of the drawbacks of TiO2 photocatalyst in suspension, zeolite(NaY) molecular sieves were used to support TiO2. The preparation conditions of TiO2/NaY composite photocatalyst were optimized in this research. Moreover, the effect of NaY on crystal type, phase transition temperature and photocatalytic properties was investigated, and the influence of TiO2/NaY on the degradation of organic waste water was analyzed. The results indicate that the TiO2/NaY composite photocatalyst exhibits the optimal photocatalytic activity under the conditions of TiO2 loading of 35%, sintering temperature of 500 °C, roasting time of 2 h and catalyst dosage of 0.08 g(methylene blue solution of 100 mL). When methylene blue solution of an initial concentration of 20 mg/L was treated for 0.5 h with TiO2/NaY composite photocatalyst, the photocatalytic degradation rate was 95.42%, 22.3% higher than that of TiO2. High stability, high ultraviolet light transmission and regular microporous and cage structure of NaY is conducive to not only recycle of TiO2 but also improvement of photocatalytic activity of TiO2.
Optimal Design for Installing Location of Tension Pulley in Synchronous Belt Driving Mechanism
YANG Yu-ping, JI Bin-bin (School of Mechanical Engineering, Nantong University, Nantong 226019, China)According to a synchronous belt driving mechanism with tension pulley, the total length of the synchronous belt was deduced. In order to get the minimum value of the elastic deformation caused by the eccentric pulley as the synchronous belt driving mechanism was running, this paper presented the object function and constraints of the elastic deformation and achieved the optimization through an example. This provided a theoretical base to ensure the precision and installation of the synchronous belt driving mechanism.
Models and Analysis on Bundling Sale of Information Goods
SHI Fang-ning,WANG Xiang-hong,CHENG Hua(School of Economics,Renmin University of China,Beijing 100872,China)This paper studies the impact of bundling sales on merchandising of information products.Our analysis focuses on seller′s profit and consumer′s surplus,as well as the optimal bundling prices.Two common bundling types are probed: bundling of single-product in amount and bundling of multi-product.Under the assumption of continuous consumer types,price discrimination models are developed for the two cases to calculate the optimal pricing and its condition,profits and consumer surplus,as well as total surplus of the society.It is found that,for the bundling of single-product,the bundling effect is relevant to the difference between the consumer types;for the bundling of multi-product,mixed-bundling is more profitable than pure-bundling and non-bundling sales,and the effect of mixed bundling is dependent on consumers′ average valuation of products in package and the degree of discount the seller sets.The conclusion is that,under certain situations,bundling sale yields more profits,but harms the consumer′s interest and thus decreases the total surplus.
Research progress on construction of electrochemical sensors for heavy-metal-ions detection based on metal-organic frameworks and their derived materials
HAN Fang;ZHENG Ziqiang;LI Benxia;Hefei Customs Technical CenterMetal-organic frameworks(MOFs) are a new type of porous coordination polymers, which has gained wide attention in the fabrication of electrochemical sensors due to their excellent properties including large specific surface area, adjustable structure and high porosity. Herein, the electrochemical sensors based on MOFs and their derived materials are introduced and the applications of these electrochemical sensors in the detection of heavy metals are reviewed. The advantages and present limitations of the electrochemical sensors for heavy metal detection are analyzed and the future research is prospected.