bluuebunny/crossref_metadata_2025 huggingface dataset:
Research Status of Corrosion Al-Li Alloy in Acid Medium
Authors: Guo Yi , Huang Zhiyong , Jin Guofeng
Published: October 2019

Aluminium-lithium alloys commonly used in aerospace at home and abroad. In this paper, Al-Li alloys are classified into four categories according to their different elements. It also summarizes its corrosion in common acidic medium, and prospects for the development and research of the next generation of new Al-Li alloys.
Establishment of virtual vibrating sieve based on PFC3D
Authors: Liu Weidong , Gong Xing , Peng Zhenwei
Published: October 2019

The generation of virtual aggregate, close to realistic aggregate by numerical tool, is a key step in investigating the mechanical properties of asphalt mixture from the mesoscopic level. To verify the accuracy of assemblage of aggregate, this paper is based on the improved algorithm of random cutting technology previously proposed, using PFC3D editing program to establish a vibrating sieve, and the reliability of the improved algorithm was verified by sieving test. The results show that the improved algorithm of the irregular polyhedron random cutting technique proposed by the author can ensure that the gradation of the aggregate is consistent with the actual, and the sieving test can be used to evaluate the quality of the virtual aggregate based on PFC3D.
Template growth of ultrasmall Co3O4nanoparticles: a highefficiency electrocatalyst for alkaline oxygen evolution reaction
Authors: Wei Guijuan , Zhou Zhen , Zhao Xixia , An Changhua
Published: October 2019

Co3O4, a representative spinel, has received widespread attention owing to its incomparable activity, low cost, and good stability, especially electrocatalytic performance for oxygen evolution reaction (OER). During the development of spinel synthesis, some emerging synthesis methods have been developed, and the transition from the high-temperature solid phase to the low-temperature liquid phase becomes a trend. Herein, we synthesized a class of novel small-sized Co3O4nanoparticles using ZIF-8 polyhedrons as templates. Interestingly, the achieved Co3O4nanoparticles possess smaller crystal sizes and good dispersibility, providing abundant active sites for OER reaction. When used as an OER electrocatalyst, the Co3O4-ZIF8 nanoparticles exhibit high efficiency with an overpotential of 270 mV at 1 mA cm−2and a small Tafel slope of 82.0 mV dec−1. This study provides new insights into the preparation of Co3O4-based nanoparticles for applications in catalysis, energy storage, and sensors.
Facile synthesis of Co-doped MoS2/TiO2 composite as an enhanced photocatalyst for hydrogen evolution
Authors: Zhao Xixia , Wei Guijuan , An Changhua , Zhang Jun
Published: October 2019

MoS2/TiO2 composite was prepared through a simple solvothermal route by combining the layered MoS2 and TiO2 nanosheets. Then, when preparing MoS2/TiO2 composite, cobalt acetate was added to prepared Co-doped MoS2/TiO2 photocatalyst. The experimental results show that the photocatalytic activity of the Co-doped MoS2/TiO2 composite is significantly improved compared with that of the undoped MoS2/TiO2 composite in the aspect of photocatalytic hydrogen production from water. The enhanced activity should be mainly ascribed to the more exposed active sites and broadened absorption region due to the doping of Co ions.
Study on Fermentation Process of Lactic Acid Bacteria Inoculated with Kimchi
Authors: Sui Ming , Zhang Yang , Rong Jiachao , Zhu Keyong , Wei Mingying
Published: October 2019

This paper uses cabbage as raw material to ferment kimchi through lactic acid bacteria inoculation. Using sensory score, total acid, pH and nitrite content as indicators, the main factors affecting the fermentation of lactic acid bacteria inoculated kimchi were investigated. The optimum technological conditions for inoculating fermentation of Kimchi lactic acid bacteria were determined by experiments. The lactic acid bacteria grow rapidly during the fermentation process and produce lactic acid, which lowers the pH value of the kimchi. The protein in the kimchi is decomposed into free amino acids, and the calcium ions are combined into inorganic salts, which have high nutritional value.
Kinetic Modeling Of A Bi-Enzyme Time-Temperature Indicator (TTI) Based on Different Parameters for Monitoring Food Product Quality
Authors: Li Qiang , Duan Min , Liu Wen , Dai Yue , Li Ren
Published: October 2019

Time-temperature indicator has been widely applied in the food industry. And, the theoretical study shows that if the time-temperature indicator is applied to monitor food, the activation energy of TTI temperature-dependent must be consistent with the activation energy of food quality loss. In this study, kinetics of absorbance and color changes in bi-enzyme were investigated as a function of storage temperature. Absorbance value was used to evaluate the enzyme reaction process under different temperature. Color change was evaluated in terms of the total color difference (DE). The results indicated that the time - temperature dependence of Absorbance and DE values followed a zero-order model. The Arrhenius equation adequately described the temperature dependence of the reaction rate constants for both absorbance and color parameters, respectively, from which the activation energies and rate constant at different temperature were obtained. There were significant linear correlations between absorbance, color and time parameter.
Genetic Engineering Antibody: Principles and Application
Authors: Zhao Lin , Wu Qi , Song Ruirui , Yun Zhenyu
Published: October 2019

Antibodies are proteins secreted by plasma cells of the immune system to bind antigens and trigger the immune effector activity. Genetic engineering antibodies are novel recombinant antibody molecules with improved antigen specificities and effector functions, which produced by the recombinant DNA and protein engineering technologies. The ability to produce antibodies that are directed against specific antigens drives scientific discovery and the development of clinical diagnosis and therapy. This paper provides an overview of the current studies on the principle, categories, generation and application of genetic engineering antibody.
Analysis of The Rule of Traditional Chinese Medicine for Treating Herpes Zoster
Authors: Wu Yanyi , Miao Mingsan
Published: October 2019

Objective To search the clinical literature of CNKI for the treatment of herpes zoster in Chinese medicine from January 2000 to December 2018, try to summarize the rules of clinical use of herpes zoster, explore potential drug combinations, promote the development of Chinese medicine for herpes zoster, and improve the quality of life of patients. Methods The clinical research literature on Chinese medicine for herpes zoster in CNKI from 2000 to 2018 was included and included in 80 articles.Excel 2013 and IBM SPSS Statistics 23 are used as statistical tools to perform statistical processing and association rule analysis on the selected external components. Results Among the 80 prescriptions, 13 articles were applied to the topical Chinese medicine, involving 9 kinds of traditional Chinese medicines; 67 cases were compound external application, the most used substrate was sesame oil; According to the analysis of the association rules, a total of 5 core drug pairs were obtained. Conclusion Traditional Chinese medicine believes that herpes zoster is often caused by stagnation of the liver. Therefore, more heat-clearing drugs are used in the treatment.At the same time, more choices of bitter and pungent drugs are used to achieve the effect of clearing and diarrhea, heat and divergence.In the external treatment, Borneolum Syntheticum-Indigo Naturalis is a common drug pair, and at the same time compatible with appropriate substrates, to enhance drug permeability, nourish the skin, introduce drugs into the liver, thereby enhancing the efficacy.
Liver Tumor Segmentation and Subsequent Risk Prediction Based on Deeplabv3+
Authors: Sun Yuchen , Shi Caicheng
Published: October 2019

As the largest glandular organ in the human body, liver has a large number of blood vessels and is connected with many important organs, such as spleen, pancreas and gallbladder, etc. The segmentation of liver and its lesions on medical images can help doctors accurately diagnose liver tumor and assess the probability of subsequent deterioration of the patient. Generally speaking, it is not only subjective but also wastes time if doctors rely on experience to manually analyze liver CT images. Therefore, it has been extensively studied in recent years. The segmentation of liver lesions is a kind of challenging task due to the low contrast ratio between the liver, lesions and nearby organs. To this end, we proposed to use the DeepLabV3+ semantic segmentation model based on the tensorflow architecture to segment the CT image of liver and locate the lesion positions. It combined deep convolutional neural networks (DCNNs) and probabilistic graphical model (DenseCRFs) and has been proven to have very good performance in a variety of computer vision tasks.
Numerical Simulation of Seawater Desalination Effect in The Micro-Nanochannel
Authors: Wu Rongrong , Li Zirui
Published: October 2019

In recent years, the study on the micro-nanochannel in the microfluidic technology has been made significant progress for which when inner walls charged can function similarly as ion permselective membrane. This article constructed one symmetric model with three parallel microchannels connected with two sets of nanochannel arrays and explained the mechanism of desalination within the channel by using numerical simulation method. For example, when the voltage difference, Vcn
, across the nanochannel array is equal to 10 VT
, the desalting efficiency can have reached nearly 90%; as the Vcn
is increased continuously to 20VT
, the desalination rate will definitely exceed 99% and as the Vcn
increases the rate increases more slowly.
Fabrication of porous boron nitride by using polyborazylene as precursor, polymethylmeth-acrylate as reaction agent
Authors: Zhong Wenli , Chen Xiaoqing , Bernard Samuel , Miele Philippe
Published: October 2019

A novel process for the production of micro-molecular boron nitride foams has been developed through foaming of boron nitride preceramic polymer with the help of sacrificial microbeads of polymethylmethacrylate (PMMA), followed by pyrolysis under inert atmosphere. The process parameters of porous BN ceramics were studied by thermo gravimetric analysis, thermo mechanical analysis, X-ray diffraction, scanning electron microscopy, mercury porosimetry and elemental analysis. The microstructure and element composition of the porous ceramics were also studied by the above methods. The results showed that: when using polyborazylene from thermolization of borazine at 60°C as boron nitride precursor, PMMA microbeads with pore size of 25μm as sacrificial microbeads, adding into polyborazylene powder with 80 wt% in the foaming mixture. After warm-pressing the powders under 74MPa at 60°C, subsequently pyrolyzing the powders under ammonia to 1000°C then to 1450°C under nitrogen atmosphere, we can obtain boron nitride foams. Through scanning electron microscopy observation, X-ray diffraction analysis and porosity measurement, it was confirmed that the obtained boron nitride pieces were microcellular foams with homogeneous distributed pore size average at ∼19.15μm and had a mostly interconnected porosity of 79.06 vol%. The temperature should be increased to 1700-1800°C to prepare porous BN ceramic with a certain degree of crystallinity (layer spacing d002= 0.335-0.333 nm)
Research on numerical simulation and influence factors analysis for springback
Authors: Su Shaojuan , Liu Bin , Liu Bo
Published: October 2019

Accurately prediction the spring-back is great significance for plate cold forming. Finite element numerical simulation software is used to establish hull plate surface cold forming finite element model. The key technologies such as 3D model of finite element numerical simulation, the constitutive relation and cell division are analysed. And the amount of springback numerical simulation compared with the experimental results verify the credibility of the finite element simulation. At the same time the affection of material, sheet thickness and curvature radius for spring-back are analysed combined with simulation results to find the spring-back regular.
Ethyl Sorbate Was Prepared by Micro Reactor Low-Pressure
Authors: Yang Xingbing
Published: October 2019

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The distribution and performance of reclaimed asphalt pavement materials
Authors: Shi Ning , Su Huan
Published: October 2019

The asphalt content in reclaimed asphalt pavement has a great influence on the pavement performance of recycled asphalt mixture. However, few people have studied the distribution of asphalt content and its effect on the performance of reclaimed asphalt pavement. In this paper, the above problems are studied by means of SEM analysis, combustion test and other scientific means, and it is pointed out that the adherence rate of fine aggregate is an important index to measure the distribution of reclaimed asphalt pavement, and has a significant effect on the pavement performance of recycled asphalt mixture. In addition, this paper also analyzes the factors that have an important effect on the adherence rate of fine aggregates.
High Pressure Raman Study of Cs2CuCl4
Authors: Xue Kaiyuan , Chen Xi , Zhang Jiang , Mao Zhongquan , Tang Lingyun
Published: October 2019

High-pressure Raman spectra of frustrated antiferromagnet CS2CUCl4 is investigated in a diamond anvil cell. Four characteristic modes of CS2CUCl4 are observed at ambient conditions. As the pressure increases, the sample undergoes a structure phase transition at 5 GPa. After decompressing, the low-pressure Raman spectra are recovered, which indicates a reversible phase transition. We discussed the results in terms of the change of structure with pressure.
An analytical method for the determination of molybdenum in the end fitting of PE flexible composite pipe
Authors: Shao Xiaodong
Published: October 2019

The flexible composite pipe is a new type of polymer composite pipe with excellent corrosion resistance. Based on the color reaction of molybdenum with sodium thiocyanate, a photometric method for the determination of molybdenum in flexible composite pipe joint samples was established. The sample is dissolved by a sulfuric acid-phosphoric acid mixed acid, and stannous chloride is used as a reducing agent in a sulfuric acid-perchloric acid medium, and an orange-red complex is formed between molybdenum and sodium thiocyanate, and the absorbance, absorbance and molybdenum content are measured in mass. The linear relationship is in the range of 0.30%∼1.18%. This method uses a standard steel solution closer to the real sample to establish a working curve. The experiment shows that the method is accurate and simple. The molybdenum in the end fitting of flexible composite pipe was measured, and the results were satisfactory.
P-type InP thin films prepared by a non-vacuum process for photoelectrochemical water splitting
Authors: Chen Zequn , Chen Huihui , Zhao Qinfeng , Cao Chuanbao , Chen Zhuo
Published: October 2019

Photoelectrochemical (PEC) water splitting has been considered as a promising way to produce hydrogen production. Herein, we present an inexpensive and simple method for preparing high active p-type InP thin films photocathode with Zn doped at 500 °C. The amount of dopant was optimized to obtain the high PEC activity films. Electrical measurements indicated that the optimized film had the hole mobility of 350 cm2V−1s−1 and carrier density of 7.5×1017 cm3. Optical measurements demonstrated the high absorption of 90% in 450–750 nm, and the bandgaps of the samples ranged from 2.08 eV to 2.3 eV. PEC test showed that the onset potential of the optimized InP thin film was about 0.35 V vs. RHE and the saturation photocurrent of 8 mA/cm2 occurred at -0.3 V vs. RHE. These results indicated that our p type InP thin films were a potential material in PEC devices.
Experimental study on effect of loading rate on mechanical properties of CFRP equipment cabin skeleton laminates
Authors: Wang Yongyan , Feng Xuezhi , Zhang Xiangfeng , Liu Yaqi , Wang Hao
Published: October 2019

With the development of high-speed train technology, the dynamic problems caused by track irregularity and the stress maximization of CFRP equipment cabin skeleton at the edge of the beam are becoming increasingly prominent. In this paper, the tensile and compressive properties of carbon fiber laminates under different loading rates are studied by means of universal material mechanics experimental machine. The curves of tensile and compressive strength under different loading rates are obtained. The variation trends of tensile and compressive stiffness are analysed and the failure modes are summarized. It is found that the tensile strength of carbon fiber laminates does not change with the change of loading rate, but the compressive strength increases with the increase of loading rate in the range of 0 mm/min-6 mm/min and considering the influence of certain error. When the load is less than 30kN, the tensile stiffness of the material is not affected by loading rate. As the loading rate increases, the stiffness and compression stiffness increase.
A bio-signal monitoring sensor based on the microbending effect of fiber
Authors: Guo Xingqi , Li Zhaozhong , Yan Dongmei
Published: October 2019

In this paper, the focus of the study is the bio-signal monitoring sensor based on microbending effects and bending loss in fiber, the physical natures of the microbending effects and bending loss of multimode fiber are expounded through the microbending principle of fiber, and the effect of displacement on the microbending loss of fiber is explored and analyzed by deriving the microbending loss formula under the optical fiber theory. After putting the sensor on the back of a chair and letting the subject sit on the chair with the back on the sensor, the degree of microbend or radius of the fiber change as the change in chest volume during breathing results in the change in the external force, i.e., the force applied to the sensing part of the fiber. The physical change in the fiber induce changes in the amount of light energy transmitted in the fiber, causing optical loss. The respiratory rate is obtained by measuring the optical loss. The results show that the waveform displayed on the computer has good traceability performance, on which the frequencies of respiratory signals including normal breath, deep breath, and rapid breath can be distinguished. Experiments show that the sensor has good traceability feature and can automatically recognize the breathing conditions, with a signal-to-noise ratio of over 28dB
Failure Analysis of Hollow Spherical Plastic Products
Authors: Zhang Xinming
Published: October 2019

Hollow spherical plastic products, yoga balls, etc. are emerging sporting goods, and there is no systematic analysis on its burst property and corresponding testing methods. This paper systematically establishes the test methods for the weight bearing and explosion-proof of such products, and evaluates its safety from its defect’s factors. Also, in-depth analysis of the causes of its failure factors.
Ethylamine gas sensing properties of SnO2/rGO nanocomposite materials
Authors: Huang Shanshan , Song Jian , Huang Kaijin
Published: October 2019

Ethylamine has been widely used in production and life, but it needs to be monitored in real-time because of its important harm to human health. In this study, an SnO2/rGO nanocomposite gas sensitive material was synthesized by hydrothermal method, and the gas-sensing properties of ethylamine were tested by a self-made gas sensitivity test platform. The results show that the SnO2/rGO nanocomposite materials have good gas-sensitive performance of ethylamine and low detection limit (up to 1 ppm). Finally, the mechanism of gas sensitivity is proposed.
Acoustic emission properties of different mineral admixture concrete
Authors: Li Jiapeng , Qin Lei , Sha Pingping , Sun Shidong
Published: October 2019

To study the different mineral admixtures on the mechanical behavior of concrete, in this paper, three groups C20 concrete cubes made of different mineral admixtures were cast. The size of the cubes are all 150×150×150mm. Acoustic emission by uniaxial compressive test to study the different mineral admixtures on concrete mechanics performance and acoustic emission parameters (amplitude, energy, frequency) were studied. The results show that the addition of mineral powder to the concrete surface will increase the compressive strength of the early age (before 56d). Adding fly ash to the concrete will increase the compressive strength of the late age (after 90d). By combining fly ash and mineral powder, the compressive strength and durability can be better improved; and as the age goes by, the acoustic emission amplitude and dominant frequency of different mineral admixture concretes are increased. The dominant frequency of the compound concrete is greater than the dominant frequency of the single concrete.
Effect of pit detail morphology on fatigue characteristics of LD2CS aluminum alloy
Authors: Yan Guangyao , Liu Zhiguo , Mu Zhitao , Li Xudong , Liu Tao
Published: October 2019

LD2CS aluminum alloy is an important structural material for a certain type of aircraft in coastal service. In order to assess the fatigue mechanical properties of LD2CS aluminum alloy materials in the coastal airport environment, accelerated pre-corrosion fatigue test of LD2CS aluminum alloy specimens in the laboratory environment is required. Through the study of the surface morphology of LD2CS aluminum alloy specimen and fatigue fracture observation,it is found that with the increase of the number of year of the equivalent accelerated corrosion in advance, internal corrosion pit morphology is complicated, and the crack initiation corrosion pit roots are often more strident. the root radius depth ratio of corrosion pit η is defined, it is found that after equivalent accelerated pre-corrosion 7 years, when η ∈ (0,0.4], the corrosion pit is easy to become the key pit which could initiate the dominant crack. The equivalent crack for the key pit was quantified by η, and the fatigue life of the equivalent crack was predicted by the Forman formula, which was in good agreement with the life test value of LD2CS aluminum alloy specimen. It shows that the equivalent crack method considering the details of the pit root is of high engineering practical value and can provide more powerful data support for the aircraft damage tolerance analysis.
Solvent-Controlled Cascade Reaction of Ugi/Pd-Catalyzed Intramolecular Divergent C-H Functionalization for Regioselective Synthesis of Cyclopropanated N-Heterocycles
Authors: Shang Tianyi , Pan Yan , Chen Zhong , Yang Junjie , Guo Xinling , Guo Leilei , Liu Yan
Published: October 2019

A novel cascade reaction of Ugi/Pd-catalyzed intramolecular divergent C-H functionalization, which is controlled by solvent effect to achieve the regioselective synthesis of spiro- and fused-cyclopropanated indolines from the Ugi adduct of N-acylated 2-bromoarylamides.
Experimental Study on Optimization of Culture Medium and Culture Environment of Bacillus Megaterium
Authors: Ming Sui , Zhang Yang , Tao Ruixiao , Xiao Nianle , Zhou Wen , Rong Jiachao , Zhou Rongqing , Li Guoying
Published: October 2019

The medium components and culture conditions were investigated through orthogonal test. The experiment showed the optimum fermentation medium (g/L) was composed of peptone 10, beef paste 6, yeast extract 6, sodium chloride 7, agar 15,PH=8.0; The suitable culture conditions were as follows:culture temperature was 30 °C, rotating speed was 200r/min,liquid level was 60mL/250mL,inoculation volume was 5%. Bring up under the optimal conditions, using tablet coating method, the optimum fermentation time was 48h, the number of viable cells reached the peak 2.52×108cfu/mL, at this time.
Mathematical modeling and optimal operation condition analysis of heat pump two-effect direct contact membrane distillation system
Authors: Liu Ronghui , Chen Dong , Peng Yuelian , Xie Jihong , Jin Cheng
Published: October 2019

Compared with traditional membrane distillation system, the heat pump two-effect direct contact membrane distillation system has an advantage of low energy consumption. However, affected by many kinds of parameters, such as materials, components and operation conditions as well as the complex coupling between these parameters, it is difficult to achieve the optimal operation conditions and high gained output ratio (GOR) by optimizing the parameters. Therefore, analyses of mathematical modeling and optimal operation conditions of heat pump two-effect direct contact membrane distillation system were carried out in this paper. According to the operating principle and physical characteristics of key components, such as membrane distillation system, heat pump system, intermediate heat exchanger and auxiliary cooler, the mathematical model of heat pump two-effect direct contact membrane distillation system was established, the process of system performance simulation was designed and system performance simulation software was compiled to analyze the effect of ten parameters on GOR and total water production(Wtot). The optimal operation conditions analysis method of heat pump two-effect direct contact membrane distillation system was proposed. Through the developed simulation software of the heat pump membrane distillation system, using the proposed optimal operation conditions analysis method, When Wtot was 10.0kg/h and heat pump compressor power was 688W, the GOR of the optimized system could reach 9.43
Research on The Whole Teaching Process Evaluation and Quality Assurance System of Higher Vocational Colleges
Authors: Hu Xiaoming , Su Yunfeng , Wang Ting
Published: October 2019

We study the whole process evaluation and quality assurance system of higher vocational education. This paper focuses on introduces the research of quality standard system in the whole process of teaching, the whole process evaluation of teaching, and the whole process of teaching TQM (Total Quality Management). Through research, we can find out the key issues affecting the quality of teaching, when “Total Quality Management” is applied in the field of higher vocational education, we must look at all the work of the school from the perspective of service, and the school should establish a “quality system” to continuously improve the quality of education. The whole teaching process monitoring and quality assurance process is a complex system. When there are problems in the whole process of Higher Vocational teaching, we can find out the solution to the problem or a permanent solution through research. In order to improve the quality of teaching in Higher Vocational schools, we must implement total quality management. We hope to establish and perfect the quality standard system of “school, enterprise and society” which covers the quality standards and work norms of all teaching links, Establish a quality monitoring mechanism for enterprises to participate in the whole process, strengthen the process monitoring of teaching quality management, absorb the employer’s participation in teaching quality evaluation, improve the teaching quality information feedback system, and build a perfect monitoring and evaluation system. Construct a set of teaching quality assurance system with the college as the core, the education administrative department to lead, and the society to participate.
Explicit Dynamics Simulation of High-Speed Railway Bearing Based On ANSYS/LS-DYNA
Authors: Wang Yongwu , Zhang Gang , Ma Canyang , Yang Kai , Zhang Zhenqiang , Ren Zhongming
Published: October 2019

A solid model of a high-speed train axle box bearing was built by using 3D modeling software. On the platform of ANSYS/LS-DYNA, the combined dynamic and finite element analysis method is used to apply the combined radial and axial loads to the high-speed rail bearing. In order to demonstrate the dynamic contact characteristics of the bearing during operation, two operating conditions were designed. One is running at a uniform speed in a straight line, the other is running at an assumed speed with a minimum turning radius. The results show that the stress distribution, velocity and acceleration of bearing components under two different working conditions are obviously different. The research can provide reference for the design, selection and optimization of domestic high-speed rail bearings.
Study of the Process Parameters of the Laser Stereo Forming on Forming Quality
Authors: Maa Wanli , Tao Fenghe , Jiab Changzhi
Published: October 2019

Based on the supply problem of the equipment spare parts in the poor timeliness and the low accuracy during the wartime, this paper studies applying the laser stereo forming technology in the weapon parts for the supply. The 316L stainless steel is selected as the printing material in the experiment. And based on the control variable method, it takes the three major parameters of the laser power, the scanning speed and the powder feeding rate as variables to study the influence on the rule and mechanism of the processing parameters on macro forming quality. The results show that the height decreases with the increase of the laser power and the scanning speed, and the height increases with the increase of the powder feeding rate. The width is basically unchanged, which is mainly affected by the size of the spot.
Analysis on The Assembly Technology of Manned Spacecraft and Unmanned Spacecraft
Authors: Du Ruizhao , liu Zhibin , Dai Hailin , Wang Pengfei
Published: October 2019

The aerospace machine contains manned spacecrafts and spacecrafts by whether carrying the person. As an important moment, there are several characteristics between manned spacecrafts and spacecrafts in assembly process. The general assembly process is of vital importance in a spacecraft R&D system. It is at the bottom of the technical system of spacecraft manufacturing, and covers quality assurance, integrated scheduling and logistic controlling. First of all, this paper recommends the concept of the spacecraft assembly technology. And then this text introduces six aspects such as system complicated degree, the microorganism control, how to select nonmetal material, craft methods, transport methods, assembly mode to analyze the difference from spacecraft.
Force and strength analysis of FSAE racing suspension based on spatial analytic geometry
Authors: Rui Ren , Gong Bian , Fang Zhigang
Published: October 2019

Based on spatial analytic geometry, the paper established a mechanical of suspension system, which is aimed at the structure of double transverse arm suspension of FSAE racing car. Combined with the typical driving conditions of the car, we have worked it out with the MATLAB. Based on that, we have made the finite element static checking analysis with ANSYS, which is aimed at providing effective basis for the design and optimization of racing car.
Optimal thermal process parameters of hot stamping AA 6061
Authors: Xu Zhenhai , Liu Xiaohui , Chen Ru , Shan Debin
Published: October 2019

Hot stamping is a new technology developed to address the formability challenge of aluminum alloy by applying plastic deformation to the heated blank at the solution heat treatment temperature. The stamped panels gain high strength via the subsequent ageing treatment. The present paper is focused on the effect of the thermal aspects of the hot stamping process on the mechanical properties of the final formed parts. It is concluded that for AA 6061 the optimal solution heat treatment parameters are a temperature of 560 °C and a soaking time of 40 minutes, and sequent ageing should be performed at 180 °C for 6 hours. The maximum transfer time of the heated blank into the press to ensure the strong age hardening is 10 s. The low temperature could suppress the natural ageing of alloy.
Polycrystalline BiFeO3 thin films prepared by magnetic controlling sputtering method
Authors: Liu X. F. , Wang W. G. , Yin J. Q. , Wu C. S. , Chen J. X. , Wang X. J.
Published: October 2019

Polycrystalline BiFeO3 films were fabricated by radio frequency magnetron sputtering using a Bi1.1FeO3 target onto the glass and Si/SiO2/Ti/Pt substrates respectively. The samples which were annealed with different annealing conditions are pure without impurities. Our results indicate that there are relatively wider growth conditions for pure polycrystalline BFO phases.
Hot stamping process simulation based on reliable heat boundary condition
Authors: Huang He , Wang Qing
Published: October 2019

The finite element analysis is an essential precondition for the process design of hot stamping processes. The quality and the significance of the simulation results are strongly dependent on the heat boundary condition used in FE models. In this work, the heat boundary condition in hot stamping simulation was determined by analyzing the characteristics of heat transfer in the interface between the blank and the tools. The numerical simulation to the hot stamping process was made by using LS-Dyna software. It is found that the temperature changes of the hot stamped part are inhomogeneous. This results in the inhomogeneous mechanical properties.
Reliability analysis of cooling system of CNC grinding machine based on FTA analysis
Authors: Zhang Yiling , Fan Jinwei , Li Zhongsheng , Wu Changjun , Tao Haohao , Zhao Yuanyuan , Lu Qiang
Published: October 2019

In view of the lack of relevant research on CNC grinders in the field of reliability research of CNC machine tools at present, This research collected reliability data based on 19 MSK series grinder machine tools of a machine tool factory., found out the crucial subsystem which is the most important component to the whole, and analyzed the reliability of the subsystem adopting FTA (Fault Tree Analysis) . Statistical researched on 438 reliability data collected, combining with the actual production situation, the results shows that cooling system is the key to the reliability of the whole grinder machine tool. The 29 minimum cut sets obtained by FTA can be adjusted to improve the reliability of the cooling system, what is more, the reliability of grinder machine tool would be improved as well.
A threshold research for de-noising operation to the vibration signals based on wavelet package
Authors: Mi Wenpeng , Dong Weiwei , Li Liang , Kong Lingjian , Sun Yanglin , Chen Chao
Published: October 2019

Vibration signals are often interfered by salt and pepper noise, impulse noise, Gaussian noise, and other high-frequency noise, affecting the effect of vibration control research. Therefore, de-noising operation is significant for vibration signal in the practical engineering. In order to resolve this problem, wavelet package is used to remove noises from vibration signal. We provide the principle of de-noising method based on wavelet package at first. And then, the threshold selection of the method is analyzed by a vibration signal with noises. As the result shown, the noise can be effectively eliminated. This reflects that the de-noising method based on wavelet package with the hard threshold is effective.
Calibration Error Analysis of Shadowgraph Station for Large Caliber Projectile Motion Attitude Measurement
Authors: Lin Zhaodong , Gao Hongju , Sun Zhonghui , Qiao Zhiwang , Di Changan
Published: October 2019

The calibration principle and working process of shadowgraph station for large caliber projectile motion attitude measurement is studied. The main error factors affecting the calibration accuracy of the system are analysed, and the various errors in the calibration process are statistically analysed. The calibration error of the measurement system is calculated to be 0.062 mm. The error analysis process shows that the coincidence error between the laser optical axis and the central axis of double square nets is the main error of calibration. Among these errors, the installation error of optical window and the centering error of filtering target (Angle deviation between parallel light source beam axis and double square nets axis caused by coincidence error of reflected facula and incident facula) are the main sources of errors.
Price Forecast of Building Materials Based on GM (1,1) Model
Authors: Wu Chunfeng , Zhang Zhuai , Zhang Sheng
Published: October 2019

With the development of the national building materials industry, people’s energy consumption of building materials production and its own performance have also been paid more and more attention. The prediction of building material prices is a very important part of the building price management system. Based on the gray model theory, the main analysis is based on the gray prediction model to predict the price of the main building energy-saving materials required in the project, and the actual engineering case is used to verify the prediction accuracy of the gray model. The effect is hoped to provide some reference and thinking for related building energy conservation research.
Dynamic modeling and practical verification of a photovoltaic and thermal composite module system
Authors: Li Jiyong , Chen Min , Wang Jigang
Published: October 2019

In order to further improve the prediction accuracy of PV/T module temperature, this paper conducts dynamic modeling of PV/T module heat transfer mechanism based on lumped parameter method. The accuracy of the dynamic model was verified by experiments on typical sunny and cloudy days. The experimental results show that the maximum relative errors of the predicted values in sunny and cloudy weather are 7.8% and 7.6% respectively. The average relative errors were 4.31% and 4.37% respectively. The average absolute error is 2.04°C, 1.94°C. Compared with the existing neural network prediction methods, the mathematical model has higher prediction accuracy and shorter prediction period. This model can be used for PV/T system to formulate accurate control strategy in advance according to the temperature change situation, so as to optimize the energy saving during system operation. It can also be used for establishing the overall energy transfer model of PV/T system, realizing the coordinated control of thermal energy and electric energy and the cascade utilization of solar energy.
Application of Image Processing Technology in Building Surface Crack Detection
Authors: Xiong Xin , Huang Li , Tian Jinrong
Published: October 2019

The phenomenon of cracks on the surface of buildings is widespread. The existence of cracks affects the normal use of buildings, shortening the service life, seriously damaging the structure of buildings, resulting in safety accidents. Therefore, regular detection and reinforcement of cracks on the surface of buildings is a necessary link to ensure safety. At present, the detection of building surface cracks is mainly carried out by manpower with means of equipment assisted. However, there are some problems in manpower detection, such as high manpower consumption, low efficiency.This paper presents a method of detecting and inspecting cracks on building surface based on image processing technology in machine vision, which includes image gray transformation, image denoising etc. Curve fitting and least square method are used to obtain crack parameters, so as to improve the inspecting efficiency and realize the automation of building surface inspection.
Research on Optimization of Environmental Protection Scheme of Retirement Housing from the Concept of Ecological Design
Authors: Jiang Juncheng , Gao Dianbo , Chen Xianyou , He Jiajun , Lu Yuanjia
Published: October 2019

With the tide of aging sweeping the world, home-based care for the aged due to its unique advantages was replacing hospitals and institutions as the main and realistic choice for the elderly. For the increasing requirements of old-age care life, the concept of ecological design adhered to the characteristics of “removable, maintained, recycled and repeated”, which was rising to the basic principle of environmental protection design for residential old-age care and also an important measure to solve the problem of old-age care. This article would reflect the ecological design concept from environmental protection decoration, sound, light, water, garbage, heat and other environmental aspects to optimize the environmental protection scheme for the elderly housing, which helped enhance the “sense of acquisition” of the elderly.
Research on New Leakage Detection Technology for Converter Valve Cooling System
Authors: Yu Rongxing , Chen Chaoquan , Liu Chongqiang , Liu Keyang , Wu Jianchao , Lv Chuang
Published: October 2019

In order to solve the problem that the traditional leakage detection device of converter valve cannot accurately locate the leakage point, a leakage detection and location device of converter valve with two functions of leakage detection and leakage location is designed based on the leakage detection principle of sensor cable and through software programming. On this basis, an experimental platform is built, and the test results show that the short distance positioning error is within (±15 cm), which confirms the effectiveness of the device and the accuracy of positioning.
Optimization for springs of electronic brake pedal simulator
Authors: Miao Jiayu , Yao Ming , Wen Pengjing , Chai Hongjie
Published: October 2019

Brake pedal feedback is important for drivers to judge the braking time. Electric vehicles replace hydraulic brake pedal with electronic brake pedal simulator. Such a simulator transmits brake signal with cables. Therefore, a new electronic brake pedal simulator is designed in this paper, which can allow the implementation of an arbitrary nonlinear pedal force characteristic with electromagnet and different combinations of spring. The brake pedal feedback generated by the pedal simulator was emulated with matlab/Simulink. Furthermore, the springs were optimized to determine the combination to make the feedback meet requirements suitable for drivers. The simulated results prove the excellent brake pedal characteristic with the optimal groups of springs.
Experimental Design and Spray Technology Research of Ship Paint Spraying Robot
Authors: Xu Peng , He Jiajian , Liao Liangchuang , Gong Junjun , Zhao Shufan , Xu Kai
Published: October 2019

A wall climbing robot for ship painting is designed. The robot is the separation of the paint output device and the main machine of the painting equipment to realize the painting operation of the wall climbing robot. The test environment and test method design of the robot are introduced in detail, and the painting process of the robot is verified. On this basis, the thickness of paint film and the related aspects of spraying process are studied, so as to eliminate the random error caused by experience and technical techniques, and to achieve the established film thickness and the stability of paint film coating. Improve automatic spraying process and labor productivity.
Determination of solidification end position of continues cast slab based on force model
Authors: Lang Rui , Dang Jian , Zhang Qi , Guo Yansong , Shi Xueliang
Published: October 2019

For a better determination of solidification end position during the process of soft reduction to confirm the reasonable reduction position and reduction area and to get the better slab quality, by analyzing the force behaviour of slab shell during soft reduction process, a force dynamic determination model for the end position of liquid core of slab during soft reduction process has been built. The variation trend of reaction force and total pressure of segment clamping-roller with the changing of position of solidification end can be got by the using of model calculation, and by analyzing this trend, a force feedback-based model has been proposed for checking the end position of liquid core. The veracity of the force feedback-based model has been verified by using nail-shooting approach.
Research on hilly mountain tractor based on adaptive
Authors: Shao Mingxi , Zhang Xiumei , Xin Zhe
Published: October 2019

Finite element method is an effective numerical analysis method developed to adapt to the use of computer [1]. Its role in engineering practice has been extended from analysis and verification to optimization design, and it has become a computer aided by computer aided design (CAD) Engineering (CAE) an important part. With the increasing complexity of engineering practice problems, the application of finite element method and error analysis method in one of the adaptive finite element method is becoming more and more popular. The adaptive finite element mesh which reflects the physical and geometric characteristics of the structure is the necessary part of applying the adaptive finite element method. With the trend of the development of tractors in the direction of intelligent, lightweight, the application of electronic technology and micro-control technology to tractors is an inevitable way. In this paper, based on the traditional tractor hydraulic suspension system, a tractor system with force adjustment function is designed. Compared with the traditional tractor hydraulic suspension system, the system uses the electronic control technology to realize the deep displacement adjustment and force regulation, control the chip acquisition force sensor and the position sensor real-time feedback signal to raise or lower the hanging rod. Introduction.
Application of anti-eccentric open hydrostatic guideway in vertical lathe
Authors: Zhang Wenwu , Han Liang , Qian Lin
Published: October 2019

This paper introduces an open hydrostatic guideway with anti-eccentric load structure for vertical lathe. This hydrostatic guide adopts swing plate fee-dback throttling oil supply system. The structure improves the angular stiffness of the open hydrostatic guide rail of vertical lathe, ensures the stability of the worktable in a wide range of eccentric loads, and meets the requirements of high precision machining of eccentric loaded parts.
Experiments on a crane overspeed protection device
Authors: Zheng Wei , Zhao Yongpan , Weng Yiyong , Duan Xing , Jin Haibin
Published: October 2019

A crane overspeed protection device can quickly control the movement of the lifting rope and drum when the load of the crane overspeed, which can prevent the phenomenon that the lifting rope and drum are subjected to gravity and then continue to move under impulse, and effectively improve the braking efficiency of the lifting rope and drum.
Research on importance evaluation of NC machine tool working loads based on AHP-fuzzy comprehensive evaluation method
Authors: Li Guofa , Zhu Hongxiang , Wang Jili , Zhang Xinge , Huo Yongchao , Yang Haiji
Published: October 2019

The NC machine tool are subjected to a variety of working load during the actual machining process. The influence of different kinds of working loads on the NC machine tool’s reliability level are different. Therefore, this paper proposes an importance evaluation method of NC machine tool working loads based on analytic hierarchy process (AHP) -fuzzy comprehensive evaluation to judge the influence of different kinds of working loads on the reliability level. Firstly, the hierarchical structure of the importance evaluation of NC machine tool working loads is established, and then the structure of discrimination matrix and the consistency test of the matrix are determined. Secondly, the fuzzy membership R of the fuzzy subset is established, and then the weight vector M of the evaluation factor and the evaluation result vector S of the fuzzy comprehensive evaluation are determined to realize the quantitative analysis of the fuzzy object. Finally, the importance of calculating the machining center load is ranked as cutting force, feed rate, torque, tool changing frequency, temperature and noise in the example.