bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of the failure effect of MEMS capacitive high g acceleration sensor on the limit range and sensitivity
Authors: Liu Yong , Li Changsheng , He Guanhua 
Published: December 2020

Abstract
With the development of MEMS capacitive accelera-tion sensor to a higher measurement range (tens of thousands of g or even hundreds of thousands of g), the failure of the device microstructure under extreme mechanical impact has become a key factor restricting its performance improvement. Existing research mainly focuses on material stress failure and device structure optimization. Aiming at the failure of micro structure under impact, a simulation model of impact response of micro structure is established in this paper. Based on the existing over stress failure and device structure optimization, the stress failure effect and short-circuit failure effect of MEMS capacitive acceleration sensor under strong impact are proposed, and the influence rules of the two failure mechanisms on the sensor limit range and sensitivity are obtained. At the same time, the optimization design of the key structural parameters of the sensor is discussed.
Research on the Main Charge’ Stability of Certain Electric Firing Cluster Tear Bomb
Authors: Cui Xiaoping 
Published: December 2020

Abstract
In order to study the main charge’ stability of certain electric firing cluster tear bomb, the sampling research was carried out from the storage period, the storage period and the over storage period of the ammunition. The dispersion and stability of the samples main charge’ components were characterized and tested in different years by SEM, DSC and other methods. The SEM diagrams of the main charge show that the components are still distributed evenly after long-term storage, and there is no obvious change in quality. The DSC results show that the stability of main charge is excellent, this is due to that the displacements of the melting endothermic peak and decomposition exothermic peak between unstored and stored main charge are less than 2 °C.
SMA-based simulation data demand acquisition in the field of mechanical equipment
Authors: Jingwei Wang , Ping Gu , Siyu Li , Jian He 
Published: December 2020

Abstract
In view of the complexity of the simulation system in the field of mechanical equipment and the difficulty in obtaining the simulation data, the idea of requirement engineering is adopted. After comparing the current common demand analysis methods, the comprehensive micro analysis method is introduced to analyze the data demand. In this paper, the application process model of the comprehensive micro analysis method is also constructed to describe the application process of the method.
Research and Application of Locking Strip for Inter-Hexagon Screw in Main Pump for Nuclear Power Station
Authors: Wang Zheying , Zhong Shan , Cao Yu , Cheng Hanchi , Sun Qi , Fu Wei , Lin Bin , Tan Junzhe , Tao Shaojia , Liu Peng , Li Jing 
Published: December 2020

Abstract
The loosening of inter- hexagonal screws connecting internal parts in main pump for nuclear power station causes some nuclear safety problem due to medium erosion at present. Aim at the problem, a special locking strip for inter- hexagonal screws is put forward and the structure of the locking strip, the bending process and the forming die of the locking strip are designed and calculated in this paper. Furthermore, the fastening tool of the locking strip is designed, and the feasibility of the locking strip is verified in the experiment so as to improve the anti-loosening reliability. The locking strip for inter- hexagonal bolts can be widely applied to the locking and fastening industry application fields.
System Transfer Function of Incoherent Light Illumination System
Authors: Sun Yueling 
Published: December 2020

Abstract
Generally, most imaging cases are incoherent light field illumination, and incoherent light illumination system has the advantages of simple installation and no coherent noise, therefore it has received extensive attention. The optical transfer function of illumination system is an effective method to evaluate the imaging quality of such optical system. In order to evaluate the imaging quality of an optical system, the specific form of the system transfer function should be known. However, due to the in-coherent nature of the optical field, both the input function and the impulse response can only be non-negative real functions, it is difficult to deal with lots of bipolar inputs and impulse responses. In this paper, two methods for calculating the system transfer function of incoherent light illumination system under quasi-monochromatic light illumination are given. Method 1: the coherence of incoherent light is defined, and the coherent system transfer function based on the characteristics of the system transfer itself is deduced. Method 2: based on the theory of partially coherent light, started from Kirchoff’s diffraction integral, the quasi-wavefront aberration is introduced, and the spatial coherence of the light field is described by the mutual intensity instead of the mutual coherent function, finally the system transfer function of incoherent illumination is derived. The calculation formula is simple and the transfer function of incoherent light system can be calculated accurately and easily. The work in this paper is helpful to the study of the new phenomena related to incoherent optical imaging.
Irrigation remote control system based on LoRa intelligence
Authors: Xue Yuan Zhang , Kang Lou Xiao , Xin Zhang Li , Chao Shan Yong 
Published: December 2020

Abstract
In order to realize automatic remote monitoring and intelligent management of intelligent irrigation system, aiming at the existing problems of water-saving irrigation system, an intelligent irrigation system based on wireless remote control was designed by using LoRa wireless communication technology to realize low power consumption and low loss monitoring technology. This paper introduces the way and system architecture of ad hoc network in detail, and the establishment of irrigation mathematical model and irrigation algorithm in different periods of cotton field, which not only improves the utilization rate of water resources, but also realizes the intelligence of irrigation system, and promotes the transformation from traditional agriculture to intelligent agriculture.
Design Of An Automobile Exhaust Heat Energy Recovery Device Based On Linear Generator
Authors: Dai Haocheng 
Published: December 2020

Abstract
The device collects the heat energy in the exhaust gas of the car, and realizes the recovery and utilization of the heat energy according to the unique heat energy collection device and the highly efficient linear opposed generator. Through the experiment, it is obtained that the exhaust temperature of the fuel car after doing work can reach about 600-800°C, and if it is a turbocharged engine, the exhaust temperature can reach more than 900°C. Investigations and studies have shown that only 20% to 45% of the energy released by automobile fuel combustion is effectively used, and the rest is dissipated as heat. Among them, the energy carried by engine exhaust accounts for 50%-60% of the total dissipated energy. Therefore, we recover the exhaust gas of the car and convert the low-quality thermal energy into high-quality directly usable electrical energy and use it reasonably. In this work, a set of automobile exhaust heat energy recovery device is designed to modify the automobile exhaust pipe part. In the scheme, the exhaust pipe manifold is converted into a spiral structure, and the opposite linear generator is designed. We use the spiral structure to heat the high-temperature thermal energy in the exhaust gas, heat the internal water to high-temperature, high-pressure saturated steam, and then send it to the opposite linear generator cylinder. Our design makes use of the exhaust sequence of the engine, opposites each other, and works back and forth to achieve the purpose of energy recovery [1]. In this scheme, only the exhaust manifold needs to be modified, and no other consumables other than water are needed during operation. The recovered energy can be used for automobile driving and storage. At the same time, the absorption of high-temperature exhaust gas will also reduce the emission of nitrogen oxides. Through this scheme, energy recovery and the elimination of harmful gases can be achieved at the same time, and the purpose of energy saving and emission reduction can be achieved [2].
Study on the microstructure and heat affected zone of nickel-based alloy cladding layer
Authors: Luo Yunqiu , Liu Zongde 
Published: December 2020

Abstract
Six Ni-Cr-Mo cladding layers were prepared on the surface of Q235 steel by laser cladding technology. SEM and EDS were used to detect the crystal structure and element diffusion trend of the cladding layer, and the microhardness of the cladding layer and the substrate was tested with a micro hardness tester. The structure of the heat affected zone (HAZ) obtained by different preparation processes was analyzed. The experimental results indicated that the hardness of the cladding layer was about 1.5 times that of the substrate, which improved the wear resistance of the material. SEM / EDS results illustrated that the cladding layer and the substrate showed a good metallurgical bond, and the microstructure on the cross-section of the cladding layer from the junction to the surface gradually transitioned from cell crystals to dendrites. The element diffusion curves showed that the diffusion amount of Fe element is the largest and that of Mo element is the smallest. The morphology of the heat affected zone is very different from the substrate and the cladding layer, there are only pearlite and ferrite in the substrate, while martensite appears in the heat affected zone.
Quantitative Hg Content Migration Process I. YangDongfang Migration Model Calculation
Authors: Yang Dongfang , Wang Qi , Lin Dong , Zhang Longlei , Li Haixia 
Published: December 2020

Abstract
Based on the investigation data of Jiaozhou Bay in May, August and October, 1992, the migration process of Hg content that came from atmospheric subsidence in Jiaozhou Bay was studied. In August, the central point 2016 in the east of Jiaozhou Bay was taken as the source of atmospheric subsidence, with the Hg content of 0.050 μg/L. A series of concentric circles with different gradients have been formed with station 2016 as the center. The Hg content decreased from 0.050 μg/L in the center to 0.021 μg/L in the center of the Bay, 0.037 μg/L in the northwest, 0.031μg/L in the northeast and 0.033 μg/L in the southeast of the bay. According to the absolutely horizontal loss rate model of matter content, it was calculated that in August, in the eastern part of Jiaozhou Bay, from the eastern central water area to the central water area of the Bay, the absolutely horizontal loss rate of Hg content in the surface was 0.40 Yang Dongfang absolute number, 0.19 Yang Dongfang absolute number in the northwest water area of the bay, 0.45 Yang Dongfang absolute number in the northeast water area of the bay, 0.63 Yang Dongfang absolute number in the southeast water area of the Bay. According to the relatively horizontal loss rate model of matter content, it was calculated that in August, in the eastern part of Jiaozhou Bay, from the eastern central water area to the central water area of the Bay, the relatively horizontal loss rate of Hg content in the surface was 8.00 Yang Dongfang relative number, 3.80 Yang Dongfang relative number in the northwest water area of the Bay, 9.00 Yang Dongfang relative number in the northeast water area of the Bay, 12.60 Yang Dongfang relative number in the southeast water area of the bay.
A novel Laser Doppler Velocimeter based on a liquid lens
Authors: Chongbin Xi , Zhou Jian , Nie Xiaoming , Huang Rong 
Published: December 2020

Abstract
This paper proposed a novel Laser Doppler Velocimeter (LDV) based on an electrically tunable lens (ETL) to change the working distance and to extend the measuring range of LDV. On the basis of Gaussian optics, the positions along with the size of waist spot are simulated under different driving current of ETL. In addition, the working distance and measuring range of LDV under different offset lenses were measured. The results demonstrate that the LDV based on ETL is able to change the working distance and effectively enlarge the measuring range of LDV, whose volume is reduced simultaneously.
Compression constitutive relationship of RPC with different steel fiber content
Authors: Yu Xinmin , Fu Benzhao , Chen Shichuan 
Published: December 2020

Abstract
Uniaxial compression tests were carried out on RPC with different steel fiber contents. The mechanical properties of RPC and the compressive-stress-strain curves of RPC with different steel fiber contents were studied. The results show that under the same mixture proportions, compressive strength increase with the increase of steel fiber content. When the steel fiber content is 3.5%, the compressive strength of RPC cubes is the largest; under the same mixture proportions, the compressive strength of RPC cube is approximately linear with the compression strength of prism, and the peak compressive strain and elastic modulus ratio of RPC cubes increase with the increase of steel fiber content. In this paper, the equation of the rising and descending sections of the stress-strain curves of different steel fiber volume admixtures is derived. According to the results of this test, the relationship between rising section, descending section coefficient and steel fiber content is obtained.)
Summarize the Corrosion and Protection of Drum-Shaped Filter in Nuclear Power Plant
Authors: Zhang Huihui , Liu Zongde 
Published: December 2020

Abstract
The drum-shaped filter of the pressurized water reactor nuclear power plant is prone to corrosion due to the influence of sea water, moist air and other factors all year round, which puts a burden on the economic and safe operation of nuclear power plants. In this paper, the corrosion forms and causes of different parts of the drum-shaped filter are analyzed and expounded, and protective measures are put forward.
Research on the Cushioning Effect of Protective Materials under High Impact
Authors: Chen Runfeng , Sui Li , Liu Qiang , Qiu Qiangqiang 
Published: December 2020

Abstract
Aiming at the protection of the internal components of the projectile during penetration, the cushion performance of common protective materials such as polyurethane, felt, polytetrafluoroethylene (PTFE), and copper were tested. The test results show that the copper and felt have a certain cushioning effect, which can reduce the acceleration amplitude of 23,000 g by 18% and extend the pulse width of acceleration overload. The cushioning effect of PTFE material is not obvious, but it can play a role in mechanical filtering, making the acceleration curve smoother. Polyurethane material will increase the acceleration amplitude of the buffered part, it is not suitable as a buffer material.
Research on the Measurement of the Gravity Center for the Workpiece with Complex Curved Surface
Authors: Yuan Xu , Chao Zhang , Cheng Qian , Shijie Su 
Published: December 2020

Abstract
Taking the 300 kg-class single blade of the controllable pitch propeller as the research object, based on the principle of three-point gravity measurement, a secondary weighing method is developed, which obtained the relative coordinate value of the gravity center by making a difference between the two weighing data. According to the concept that each axis is independent, an error model of spatial attitude is established. The attitude deviation is obtained by using sensor scanning, and the actual coordinate value of the blade gravity center is obtained by combining with the space attitude transformation matrix. The experimental results indicated that the secondary weighing method with the space attitude transformation matrix in this paper was useful and highly accurate. The method has certain guiding significance for the gravity center measurement for workpieces with large and complex curved surface.
Research on composite material in RMS control of antenna
Authors: LI Yu-Hua , Jing Li-Li , Jian Jiang Wen , Wen Shi Jin 
Published: December 2020

Abstract
In this paper, the main factors of the deformation of composite satellite antenna reflector are analyzed, and the related basic research work is carried out from two aspects of tooling material selection, structural design and product main material selection. The conclusion can be used to guide the follow-up work, and also provide ideas and basis for high-precision antenna.
Angle expanding fracture analysis of Q420B angle steel
Authors: Fu Chunxia , Ren Facai , Wang Peng 
Published: December 2020

Abstract
The cracking angle steel is analyzed by chemical composition analysis, tensile test, impact strength, bending test, metallographic structure and other physical and chemical test methods and all indicators meet the requirements of the standard, so material quality is not the cause of crack of angle steel. The stress distribution of Q420B angle steel in the process of expanding angle in cold working is analyzed by numerical simulation. Three dimensional simulation results show that when the angle of expansion reaches 92° and the maximum principal stress exceeds the tensile strength of the material, the angle steel breaks; The results of plane strain calculation show that when the angle of expansion reaches 92.6° and the maximum principal stress exceeds the tensile strength of the material, the angle steel breaks.
Study on the migration of four phthalates from plastic food contact materials to food simulants
Authors: Qiu Yue , Ruan Yan , Zhang Lu , Zhang Qing , Tan Chaolan 
Published: December 2020

Abstract
The ultra performance convergence chromatography method was developed to detect the migration of four phthalates (PAEs) in plastic food contact materials. Plastic food contact materials samples are immersed with oil-based (isooctane) and water-based simulants (10% ethanol, 4% acetic acid and water), respectively. The pre-treatment method of four kinds of PAEs in the simulated immersion solution was optimized. The relationship between migration behaviour and the simulants, migration temperature and migration time were studied. The results show that PAEs were more likely to migrate in oily simulants. Within a certain range, the migration amount increased with the extension of immersion time. The migration rate and amount enhanced with the temperature.
Research on the simulation of a new compensation strategy for dynamic voltage correction device
Authors: Zhang Xuewei , Sun Xiaojuan , Wang Tianfeng 
Published: December 2020

Abstract
A new detection and compensation method for voltage sag is proposed. Dynamic voltage correction device(DVCD) is the most effective device to solve voltage sag. Based on the shortcomings of the traditional compensation strategy, the compensation characteristics of the compensation strategy are analyzed systematically. This paper proposes a new compensation method based on the traditional minimum energy compensation method, which uses different minimum energy methods for different sags, namely zero active power exchange and minimum energy exchange. Through Simulink to establish the simulation model of minimum energy method, and make simulation analysis. The simulation results show that the method can achieve the minimum output active power while ensuring the compensation effect, which proves the feasibility and effectiveness of the method. This method can make full use of energy storage of equipment and has high economic benefits.
Research on Building Gas Pipe Leakage Detection Based on LabVIEW and Multisim
Authors: Rui Wu , Zhao Yang 
Published: December 2020

Abstract
According to the micro energy vibration signal which is generated by the internal gas injection when the building gas pipe leaks, a set of building gas pipe leakage detection and analysis system is designed. The final analysis results of the system can provide the basic analysis data for the timely detection of building gas pipe leakage and the quantitative and qualitative change results caused by leakage. The system selects 801S vibration sensor to extract the vibration signal generated by pipeline leakage, and then amplifies the weak voltage signal converted by vibration signal through signal conditioning circuit. The signal conditioning circuit completes the simulation through Multisim platform and verifies that the expected results meet the requirements. Finally, the signal processing program and detection program based on HHT algorithm are designed and constructed by LabVIEW platform to decompose the data of the conditioned signal and determine whether there is leakage. The results show that the dynamic and static characteristics of the system are fine, and the accuracy is high, especially the effect of the low-frequency and low-pressure (200Hz and below 5V) signal detection is very well.
Development of a Miniature Recorder for Drilling Motors
Authors: Li Fei , Song Haolan 
Published: December 2020

Abstract
A recorder is designed to record the vibration data of the drilling motor for health assessment of the motor to improve the drilling efficiency. It is installed in the rotor catch of the drilling motor without increasing the length of the bottom hole assembly(BHA). The recorder is equipped with two triaxial vibration accelerometers with different ranges, a rate gyroscope, a temperature sensor, and an integrated circuit (IC) for timestamps. The recorder can measure and record the vibration data of the entire operation cycle of the ground transportation, rig-side handling and downhole operations of the motor. Vibration recorder does not require any configuration or intervention at rig sides so that it can be easily deployed to motor operations. The Python-based data analysis software was developed for the miniature vibration recorder. The analyzer can make statistics on the recorded data and display it with time plots and histogram. The vibration recorders provided adequate information of a drilling motor to maintenance shops and operator. These statistical data and charts can help users understand transportation, rig-side handling and downhole drilling.
Simulation of the dipole pattern of summer precipitation over the Tibetan Plateau by CMIP6 models
Authors: Shang Wei , Duan Keqin , Li Shuangshuang , Ren Xuejuan , Huang Bo 
Published: December 2020

Abstract
The dipole pattern of summer precipitation over the Tibetan Plateau (TP) during 1961–2014 is evaluated based on observations and 18 models provided by the Coupled Model Intercomparison Project Phase 6. Of the 18 models, 10 can capture the opposite variation characteristics in the south and north TP. Observational data reveals that the south–north seasaw of TP summer precipitation is essentially driven by a Rossby wave propagating from the Western Europe to East Asia, which is associated with North Atlantic oscillation (NAO). The models successfully simulated the dipole pattern that is closely related to the reproduction of the NAO–TP relationship. Further analysis demonstrates that the reliable simulations of horizontal dynamic processes of moisture transport, which is linked to the NAO–TP relationship, highly contributes to their success in reproducing the dipolar pattern of TP summer precipitation. While unrealistic local vertical circulation and evaporation simulation lead to the failed reproductions. These findings provide significant information for model development and future climate change projections.