bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design and Development of Tissue Engineering Materials based on Imine Bonds
Authors: Tao Yangchun , Liu Siwei 
Published: April 2023

Abstract
Hyaluronic acid was oxidized to obtain hyaluronic acid containing aldehyde groups (ALD-HA). Then it was reacted with PETMP-AU, the photo-initiated reaction product of pentaerythritol tetra(3-mercaptopropionate) and allylurea, to synthesize a bioscaffold material with dual degradation behaviors, both to hyaluronidase and to weakly acidic environment. The material has a heterogeneous porous micromorphology with a pore size ranging from 10 to 100 μm. The growth of osteoblasts in the polymer was observed. The MC3T3-E1 osteoblasts encapsulated in the polymer could adhere to the inner wall of the pores and grow three-dimensionally. Moreover, the cells could continue to divide and proliferate and grow well. It shows that the material has good biocompatibility and can be used for biological tissue engineering materials.
Detection of Void and Crack Defects in Type IV Hydrogen Storage Vessels by Microwave Technique
Authors: Pan Jinping , Zhu Chaoming , Hu Jian , Zhu Xinwei , Yang Jianhua , Guo Yanxing , Tan Lianjiang 
Published: April 2023

Abstract
Non-destructive testing based on microwave technique has been developing rapidly. In the present study, microwave-based method was used to detect void and crack defects in the carbon fiber composite wound layer of type IV hydrogen storage vessels. Taking advantage of a vector network analyzer, the reflection coefficient S11 of type IV hydrogen storage vessel samples without defects and with a void or a crack defect in the composite wound layer was measured. The defect-containing vessels exhibited S11 values much different from those of vessels without defects, according to which the defects can be detected. Additionally, identification of the two defects can be realized by analyzing the S11 values, as the void gives rise to more reflection of microwave than the crack. During the inspection, only when the horn antenna is against the defect does the S11 show significant changes, suggesting the detection sensitivity of the method. This study lays a solid foundation for the development of microwave inspection of defects in the composite wound layer of type IV hydrogen storage vessels.
Research on the Analysis of Wear Mechanism and Improvement of the Two-way Limit Valve
Authors: Liu Zi , Chen Xu , Ren Yizhi 
Published: April 2023

Abstract
Aiming at the pollution fault of aircraft hydraulic system caused by the abnormal wear of the two-way limit valve, the method combining theoretical analysis and numerical simulation is used for fault location analysis based on the structural characteristics of the two-way limit valve, and the effect of the main affecting factors, such as the fitting size between parts and the position deviation of the filter holes, on the wear is studied. The results show that the wear of the two-way limit valve is mainly caused by axial assembly gap inside the product, and assembly gap greater than 0.019mm will cause abnormal wear. To solve the problem, it is suggested that no axial assembly gap will be controlled for subsequent product assembly. The two-way limit valve after 100 times of bidirectional alternating pressure supply test has normal performance and no wear phenomenon occurs.
Influence of Electrolytic Cell System on Graphite Electrode Interface Properties
Authors: Zhao Xing , Wang Peng , Chao Peipei , Liang Xinmiao , Dong Honglei 
Published: April 2023

AbstractCyclic voltammetry (CV) and Electrochemical impedance spectroscopy (EIS) tests are used to investigate the performance of different cell systems. For two electrode button type cell, as the lack of reference electrode and its large contact resistance, it does not have the conditions on study the electrode/electrolyte interface performance effectively. Although the three-electrode button type cell shows some improvement on potential detection of the system which can partially eliminate the adverse effects caused by electrode polarization and reduce the contact resistance, there are some limitation on the investigation of the resistance of solid electrolyte interphase (SEI) film and charge transfer process. However, it can show the variation of kinetic parameters well in the three-electrode glass type cell, which is the premise on studying the reaction mechanism, failure mechanism and electrode interface characteristics of electrode materials.
Experimental Research and Application of Lightning Protection for Radome
Authors: Li Qiuliang , Si Xiaoliang , Li Zhibao , Ding Ruihuan , Yan Wei , Sun Guoqing , Duan Zemin 
Published: April 2023

Abstract
In order to solve the problem of poor compatibility between lightning protection and electromagnetic wave transmittance, a new metal oxide diverter strip was selected in this paper. The breakdown characteristics of the diverter strip were studied by high voltage test, and the layout of the metal oxide diverter strip was designed and optimized by empirical formula. The lightning protection design test was carried out for a type of radome, and the feasibility of the method was verified. This method solves the problem of the radome perforation caused by the large inductive electric field of the antenna and is of great significance for the lightning protection design of the radome and its internal antenna equipment.
Development of Oxygen Concentration Control and Monitoring Device and Its Application in Mold Culture
Authors: Huang Yangyang , Cui Ming , Li Bangyu , Ma Siyu , He Lili , Liu Yangyang 
Published: April 2023

Abstract
An oxygen concentration control and monitoring device is developed, which can collect ambient temperature, humidity, and oxygen concentration, realize local display, local storage and network remote transmission functions, and use wireless power supply to run in the test chamber. Test chamber interface water seal. The growth verification test of aspergillus niger was carried out in the experimental device developed in this paper, and it was found that the growth of aspergillus niger on silk can be effectively inhibited under low oxygen conditions. When the oxygen concentration is lower than the threshold value of 0.7%, the growth of aspergillus niger is in a stagnant state.
Study on Mechanical Properties of Carbon Nanotube Reinforced Carbon Fiber/ Epoxy Resin Composites
Authors: Zhang Jianqin , Zhang Haiyun , Xu Jingli 
Published: April 2023

Abstract
Carbon nanotubes(CNTs) reinforced carbon fiber/epoxy resin composites with different amounts of carbon nanotubes were prepared by using carbon nanotubes as reinforcement. The effect of the amount of carbon nanotubes on the mechanical properties of the composites was studied. The results show that carbon nanotubes enhance the mechanical properties of carbon fiber resin composites to some extent. When the content of carbon nanotubes is 0.5%, the transverse tensile strength and modulus of the composites are increased by 32.7% and 9% respectively, and the flexural strength and modulus are increased by 12.8% and 16.4% respectively. When the content of carbon nanotubes is 0.3%, the compressive strength reaches the maximum and is increased by 28.7%.
Development of Neural Network Recognition Model for Optical Illusion Images
Authors: Wu Bo-Wen , Huang Chou-Chun , Lin Wen-Chieh 
Published: April 2023

Abstract
In the battlefield, tank armored vehicles have high mobility, strong defense and stable transportation capabilities, and play a role that cannot be ignored. However, its appearance and camouflage pattern design often have the camouflage effect of geometric optical illusion. The good recognition effect can ensure the safety of soldiers, and also avoid the loss of life and property of the people by accidentally hitting the surrounding houses. Therefore, how to quickly and effectively identify its appearance has become an urgent problem to be solved in the military. In this paper, the outline of the vehicle is disassembled into 12 most representative basic shapes for analysis, using image preprocessing technology, invariant moment feature extraction, and developing a BPNN(back propagation neural network) recognition model, which effectively improves the recognition rate of tank armored vehicles over above 95%.
Content and Spatial Distribution of Carbon in Shuangtaizi Estuary, China
Authors: Xia Lianqiu , Han Ruxia , Zhang Jin 
Published: April 2023

Abstract
Contents of total organic carbon (TOC), total inorganic carbon (TIC) and total carbon (TC) in water and sediment in Shuangtaizi estuary in China were studied. The results showed that the TIC and TC contents in water were high, and the TOC content was very low. In sediment, the TOC and TC contents were high, while the TIC was very low. TOC, TIC and TC had obvious spatial distribution characteristics in water and sediment in the area. The distribution of TOC and TC in sediment was similar, which was increase along with the distance to the mouth. The distribution of TIC and TC in water was similar. The TIC was mainly distributed at the outer mouth in surface water, while at the inner in deep water was little. The terrigenous input was the main source of carbon in the area. Carbon sequestration in the long range would convert the inorganic carbon to organic carbon.
Water Conservation Challenges and Solutions to Preserve National Food Security
Authors: Yuan Yong , Zhao Zhongnan , Tian Ying 
Published: April 2023

Abstract
Political security, economic security, social security, and national security have a close relationship to food security. Thus, we focus on water conservation to ensure and support national food security. Here, we also systematically summary the irrigation area and agricultural water use in our country, and analyze the challenges of food security in the view of the relationship between water resources and grain-production arrangement, agricultural water use efficiency, and farmland water conservancy investment. In light of that, we also propose some solutions and suggests, which may lay theoretic foundations for national food security.
Design of Mopping Robot
Authors: Meng Fanzhao , Li Mingwei , Yang Yonghai 
Published: April 2023

Abstract
With the development of Internet of Things and intelligence, cleaning mobile robots have gradually replaced the traditional manual cleaning work, and intelligence has become the main research direction of sweeping robots. As a new product in the field of service robot, mopping robot has made some achievements, but there are still many key technical problems to be solved or improved. In order to improve the safety of products in public places such as shopping malls, a robot with multiple cleaning functions such as vacuuming, mopping and drying is proposed. The mechanical mechanisms mainly include a frame, a three wheel walking mechanism, a sweeping mechanism, a mopping mechanism, a drying mechanism, etc. It can realize wifi control and mobile phone APP control, and solve the problems of the existing mopping robot such as single function, low cleaning efficiency, and the danger of slippery ground.
Design of a Bean Sprouts Device by Soilless Automatic Cultivation
Authors: Wei Yiyuan , Jiang Junxiang , Shi Yangtao , Li Zhaochang , Liang Mingyuan , Qin Likun 
Published: April 2023

Abstract
In order to solve problems: the existing household bean sprouts cultivation device is relatively simple; bean sprouts are easy to be contaminated in the open cultivation tank which affects the quality of bean sprouts, and the automation is poor. The bean sprouts device by soilless automatic cultivation adopts cylindrical closed culture bin structure, and the temperature and humidity sensor is set in the culture bin, which can monitor the environment in real time. At the same time, the heating plate, fan and humidifier are set in the culture bin to heat up, cool down and humidify the environment, so as to realize automatic bean sprouts cultivation. The prototype test showed that: at the temperature 26°C-30°C, humidity 85%-95%, the diameter of mung bean sprouts can reach 2.5mm, and the height can reach 150mm. the diameter of yellow bean sprouts can reach 3mm, and the height can reach 160mm. The average yield of the two sprouts was 98%. The device has the advantages of soilless, intelligence, miniaturization and simple operation, which can meet the requirements of automatic bean sprouts cultivation. It is a necessary product for household in the future.
Application and Analysis of New Pro-Environment and Water-Saving Composite Water Cooling System in Natural Gas Long Distance Pipeline
Authors: Cui Pengfei , Zhang Enlong , Wang Zhenyu , Wu Anbing , Geng Man , Chen Jianye 
Published: April 2023

Abstract
The traditional water cooling system of electric drive compressor in natural gas long distance pipeline uses cooling water tower, which has many problems in practical engineering: spraying water for cooling consumes a large amount of water continuously, continuous dosing and sewage discharge is needed, and winter anti-freezing measures are complex and so on. In view of the above defects of cooling water tower, this paper introduces a new type of composite water cooling system, which is completely closed, cooling without spraying water, no water consumption and discharge, daily maintenance free, its comprehensive advantages are obvious. The first composite water cooling system has been put into operation for more than 5 years, with good functions and performance, and has been widely used in electric drive compressor engineering stations.
A Method for Estimating Water Level in Sedimentation Channel with Sluice Gate
Authors: Shi Ming , Luo Xin , Luo Wenguang 
Published: April 2023

Abstract
In this study, based on previous studies on sedimentation, and related mathematical methods, considering from the three aspects of the water and sediment condition, the banked-up water level condition, and the sediment characteristic condition, we proposed a method for estimating water level in sedimentation channel with sluice gates, and the calculated results of it are in good agreement with the assumed results. It has high expansibility, which can be used to calculate the change of water level under other channel with sluice gates factors. In general, it can provide scientific theory and decision basis for channel with sluice gates dispatch of sedimentation channel with sluice gates in practical engineering.
Designing of Pd1/TiO2-x Nanosheets for the Electrocatalyzed Reduction of CO2
Authors: Cheng Yujin , Liu Rui 
Published: April 2023

Abstract
The electrochemical reduction of carbon dioxide into valuable products has attracted increasing attention to meet the demand for sustainable fuel, as well as achieving the carbon neutralization strategy. Pd is art of the state CO2RR catalyst but prone to be poisoned by the primary product CO. For the modulating the electronic state of Pd sites and therefore affinity for CO, we herein synthesized TiO2-x nanosheets to support Pd atoms. The oxygen vacancies were introduced into the titanium oxide by calcination to increase the electric conductivity of the titanium oxide, and more importantly, as a means of modifying the energy diagram of Pd. The morphology of the as-synthesized Pd1/TiO2-x was observed on high-resolution transmission electron microscope and Cs-corrected high-angle annular dark-field (HAADF)-scanning transmission electron microscope. The structure of the atomically dispersed palladium was also characterized by FTIR spectra of chemisorbed CO. The impedance of the Pd1/TiO2-x was determined to prove the improvement of its electric conductivity. The Faradaic efficiency for liquid products, mainly HCOOH/CH3OH of the electrochemical reduction of CO2 using this catalyst is 14.74%.
High Voltage Cable Fault Location Technology Based on Traveling Wave
Authors: Wang Lei , Wang Zhe , Niu Lin , Guo Lijuan , Pei Ying , Li Hongbo , Ma Zhiguang , Zhang Zhenhai , Chen Lina 
Published: April 2023

Abstract
High voltage cable line is an important part of power grid; its stable operation is of great significance to urban power system. This paper proposed a high voltage cable insulation monitoring system using traveling wave. The travelling wave data are collected by high precision satellite timing signal and an on-line fault location system for high voltage cable is designed.
Research and Application Practice on Technical Supervision of Nuclear Island Mechanical Equipment in NPP
Authors: Yang Lifei , Wang Qinhu , Ma Yijin , Liu Xiaolei 
Published: April 2023

Abstract
The safe and reliable operation of nuclear island mechanical equipment in NPP is directly related to the stable power generation of units. Strengthening the supervision and management of nuclear island mechanical equipment is an important measure to improve its reliability. This paper presents a nuclear power plant nuclear equipment purpose and significance of electric power and technical supervision, technical supervision scope, equipment identification methods, technical supervision content build process, and the reactor coolant system main pump as an example, compiled the technical supervision guide, some CPR1000 nuclear power plant in the pilot application. The existing problems in the management of the main pump group were found, and suggestions for improvement, reliability improvement and economy improvement were put forward. The practice has proved that the technical supervision of nuclear island mechanical equipment in nuclear power plants is helpful to improve the power generation capacity and economy of nuclear power plants.
Structural Design of Hub Motor Based on Bidirectional Excitation
Authors: Yao Xueshi , Zhou Meijuan , Li Lin , Zhang Xinghua , Zhong Xiaohua , Zeng Lingchao , Guo Chunyang 
Published: April 2023

Abstract
It is analyzed that the hub motor of new energy vehicles.Two kinds of hub motors,the inner rotor and outer rotor are designed. Their stators adopt the radial and axial bidirectional excitation.The rotor’s permanent magnets adopt Halbach distribution, and the magnetic circuit adopts composite magnetic conduction structure.The hub motor of the inner rotor is designed which includes its left stator,right stator and outer stator.The left and right stators are arranged on both sides of the axial direction of the rotor, the outer stator is arranged on the radial top side of the rotor,the three stators are fixedly sealed together,which are composed of composite iron core and coil.The rotor is composed of a yoke and permanent magnets.The permanent magnets of the rotor are pasted on the left and right side of the yoke and the outside of the top ring. The excitation magnetic flux of the three stators are distributed sinusoidally to form a three-way closed circuit.The outer rotor of the hub motor is designed,which T-shaped stator forms the radial and axial bidirectional excitation structure,which is fixedly sealed into an armature by excitation winding, composite material iron core and resin.The composite material iron core is composed of steel fiber reinforced epoxy resin.The rotor is arranged on the outside of the T-shaped stator to form an outer rotor.The T-shaped stator is fixed on the shaft, and the rotor is installed on the shaft by use of bearings. The above two hub motors have high output torque/power density, low heating effect, light weight and simple assembly.They are suitable for electric car series.
Probe into the Influence of Water Content upon the Safety and Stability of Loess Slope Based on the Garden Project of Hejin Cherry Valley
Authors: Liu Xiaoxuan 
Published: April 2023

Abstract
In order to consider the influence of soil moisture content change on the slope stability of Hejin Cherry Valley Garden Project, this paper firstly selects soil samples at typical locations to obtain the shear strength test results of loess under different moisture content; Then, based on rhinoceros and FLAC3D software, the strength reduction method is used to analyze the slope stability, and the impact of water content on the slope stability is comprehensively evaluated according to the safety factor, plastic zone and shear strain. The results show that when the soil is completely dry, the cohesion and internal friction angle are both maximum; When the water content is 11%, the internal friction angle and cohesion are at a low level; Under different water content conditions, there is a watershed for slope stability. The water content is higher than 11%, and the safety factor is lower than 1.3. With the rise of water content, the maximum shear strain of the slope spreads from the toe to the slope surface. It is found in the comprehensive plastic zone the slope surface near the top of the slope is prone to landslide. The research results of this paper can provide reference and guidance for the stability and safety of loess slope after the construction of landscape architecture in Central Plains.
Miniaturization of Biogas Upgrading Via High Pressure Water Scrubbing to Enhance Economic Competitiveness of Distributed Biomethane
Authors: Qian Wei , Kang Zezhong , Luo Laixing , Zheng Zongming , Xiao Xianbin , Qin Wu 
Published: April 2023

Abstract
Biogas is an important clean and low carbon energy for rural area, which is confronted with the low heat value, pollutant emission during combustion. The pollutant absorbing technology was employed to develop the small scale portable biogas upgrading equipment to remove CO2, H2S and other impurities in this work. The scheme based on the high pressure water scrubbing technology (HPWS) were proposed including adsorption, flashing, stripping and water recovery. Aspen Plus were used to investigate the effect of adsorption pressure, number of plates, and flash pressure on CH4 purification. The mole fraction of CH4 in final stream increased to 95.6% and levelled off around 97% with the increasing of flash pressure and absorber pressure. The water consumption will decrease with the increase of the number of plates. When the number of plates is above 7, the reduction of water consumption will not be obvious. The principle equipment was developed and tested, indicating the high separation efficiency.
Finite Element Simulation and Experiment of Temporary Active Transverse Brace of Inward-inclined Bridge Tower Construction
Authors: Chen H , Niu YW , Bai GY , Sai ZY 
Published: April 2023

Abstract
For the bridge tower with large inclination angle, the beam element in Midas finite element software is used to model and analyze the bridge tower structure, and its accuracy is difficult to guarantee. In this paper, taking the construction of a suspension bridge’s inward-inclined tower as the research background, the finite element simulation of the inward-inclined bridge tower is carried out by using the two modeling methods of the beam element and the solid element. The calculation accuracy of the beam element model, the specific position and the jacking force applied by the active transverse brace of the inward-inclined bridge tower are determined, and the field test of the tower bottom stress during the construction process is performed. The results show that: when the inclination angle of the bridge tower is small (5 °), the beam element element is used for modeling and analysis, which has fast calculation speed and high calculation accuracy; When the inclination angle is 15 °, the error of the beam element model exceeds 30%, and it is recommended to use the solid model for calculation; the active cross brace plays a key role in controlling the stress at the bottom of the tower column before the lower cross beam is applied. And after the construction of the cross beam, the active cross brace forms a closed frame structure with the lower tower column, and the subsequent cross brace has little impact on the stress at the bottom of the tower column; Compared with increasing the number of temporary cross braces, increasing the jacking force can improve the stress at the bottom of the tower. And by adjusting the position of the active cross brace and applying the appropriate active jacking force, the stress at the root of the tower column can be greatly improved.