Abstract.Science and Technology(S&T) finance is the catalyst of economic growth and financial innovation. Based on the input-output panel data of S&T finance in the Yangtze River economic belt from 2015 to 2019, this paper uses the Three-stage DEA model to measure the efficiency of S&T finance in provinces and cities in the Yangtze River economic belt，and Tobit regression model is used to explore the factors affecting the efficiency of S&T finance.The results show that: first, the efficiency level of S&T finance in the Yangtze River economic belt is not high as a whole, and is significantly affected by … Read more →

Abstract.The loose coupling transformer, the core component of the rotary wireless excitation system, has a large leakage inductance due to the existence of a large gap, and the coupling coefficient cannot be effectively improved, thus limiting the improvement of the system efficiency. In order to solve this problem, firstly, the equivalent modeling and leakage inductance analysis of the rotary loosely coupled transformer are carried out, and the improved design is carried out according to the defects of common windings, and an improved shaft rotary coupler is proposed. The feasibility of this … Read more →

Abstract.In the context of building a smart maritime scene, through building a maritime smart service, improve the efficiency of ships entering and leaving the port, and reduce the waiting time for ships to load and unload goods in the port. In this paper, the basic function of querying the ship arrival and departure reports is provided, and the data of the ship arrival and departure reports are visually displayed by analyzing the data of the ship arrival and departure reports. Analyze the traffic of ships between provinces, and analyze the historical freight data of ships to draw a preliminary ship … Read more →

Abstract.Heavy metal pollution, as an increasingly concerned environmental issue, has attracted social attention for its causes and effects. At present, heavy metals enter soil/water bodies mainly through man-made factors such as mining, metal smelting, application of pesticides and fertilizers, and natural factors such as geological erosion and weathering. Heavy metals have the characteristics of high toxicity, non-degradation, and easy bioaccumulation, which seriously threaten the survival and safety of human beings. At present, people's research on the treatment of heavy metal ions is more in-depth, … Read more →

Abstract.Water injection motor in western Daqing Oilfield is the key equipment of water injection to the oil field. Due to the great pressure of water injection to the oil field, the water injection motor is often overloaded and runs at high speed, so that the rolling bearing of the motor is worn, deformed and other faults. In order to detect the small faults that are not easy to detect in the early stage of the motor bearing, this paper proposes a method combining variational mode decomposition (VMD) and fast spectral kurtosis. The optimal number of modes is determined by correlation and energy ratio. … Read more →

Abstract.In recent years, with the rapid development of digital technology, digitization has become one of the main ways to protect and disseminate intangible cultural heritage (ICH). In this study, 298 papers in the Web of Science (WoS)database and 240 papers in the China National Knowledge Infrastructure(CNKI)database from January 2004 to December 2021 were used as samples to compare and analyze the research on digitization of ICH in China and abroad. By analyzing and visualizing the information of publication time, discipline distribution, country distribution, authors, institutions, and keywords, … Read more →

Abstract.Aiming at the problem of low detection accuracy of existing object detection in fog and haze weather, a defogging object detection method based on DeblurGANv2 and YOLOv4 is proposed. In this method, the image enhancement algorithm in the generation countermeasure network DeblurGanv2 is added to the preprocessing module of YOLOv4 to preprocess the foggy image and retain the high-quality texture and color information of the image, At the same time, the lightweight neural network ShuffleNet V2 is used to replace the CSPDarkNet53 network used for backbone feature extraction in YOLOv4 to improve … Read more →

Abstract.The fuzzy control of fractal-order chaotic systems are studied. Firstly, according to the T-S fuzzy modeling theory, the fractional order unified chaotic system is reconstructed by T-S fuzzy modeling. Secondly, the steady-state performance of Fractional-order unified chaotic systems is discussed by using Lyapunov stability theory. Then, a Fractional-order Non-fragile fuzzy controller is designed according to the linear matrix inequality (LMI) method. Finally, a simulation example is given to verify the effectiveness of the controller. Read more →

Abstract.Through the mechanism study, it can be seen that the three kinds of passivating agents can increase the soil pH value and cation exchange capacity, which is beneficial to the transformation of heavy metals from ion exchange state to residue state. The addition of organic fertilizer can increase the activities of urease and acid phosphatase, and montmorillonite is beneficial to activate the activity of catalase in the soil. MO treatment can simultaneously increase the activities of the three enzymes and increase the absorption of soil carbon, nitrogen and organic phosphorus. Electron microscope … Read more →

Abstract.Epileptic eeg signal has obvious characteristic information, which can be used as an important basis to judge whether epileptic seizure occurs. Because of the low recognition rate of single feature extraction method, a method of eeg feature extraction based on wavelet packet transform and improved fuzzy entropy was proposed. In view of the characteristics of eeg signal with large noise and weak signal, the Wavelet packet Transform (WPT) is used to decompose the EEG signal with multi-resolution and make it into the signal with different characteristics. The original Fuzzy entropy (Fuzzy EN) … Read more →

Abstract.The transformation of scientific and technological achievements has ushered in new opportunities and shown new characteristics. On the basis of analyzing the characteristics of innovation ecosystem, this paper puts forward the main mechanism of innovation ecosystem enabling the transformation of scientific and technological achievements, constructs the innovation ecological model of the transformation of scientific and technological achievements, defines the innovation subject and innovation environment of the transformation of scientific and technological achievements, and puts forward three … Read more →