bluuebunny/crossref_metadata_2025 huggingface dataset:
Parametric Design of Glaze Color and Texture Feeling of Painted Pottery of the Huaning Pottery
Authors: Yao Wang
Published: June 2020

The protection, inheritance and innovative design of Yunnan Huaning pottery has attracted many scholars’ research. However, the key to modern innovative design of Huaning pottery is to find the connection point between traditional craftsmanship and modern design by using parametric design method in design. On the basis of many field investigations, the parametric design method is applied to collect glaze patterns and analyze the information of classification, textual research, data standards, etc., so that the glaze color and other data of folk art ceramics can be changed and classified as a whole. Parametric design method is applied to the analysis and research of glaze color and texture of traditional pottery, which is the trend in the field of innovative design of pottery products in the future.
Blind-assisting Waistcoat Based on Distance-Vibration Algorithm and Sensory Substitution Principle
Authors: Lou Yifan
Published: June 2020

At present, there are more than 200 million people having the congenital or acquired visual disorder in the world. Blindness make the daily activities of people subjected to various restrictions, and the most prominent restriction is obstacles in walking. The traditional guide tool used by most visual impaired people for assisting the walking has the defects such as single function, inconvenience in use, poor combination with the human body, etc. Therefore, with the development and increasing mature of the wearable device and the Internet-of-things technology, a new way is searched for solving the walking problem of the blind people, and the study for combining the blind assisting device with the frontier neuroscience, wearable technology and Internet of things can make the science and technology to benefit this disadvantaged group and has positive social significance. This study utilizes the laser radar to substitute the visual organ to acquire spatial distance information around the blind people, transmits the data to the Arduino single chip microprocessor to process through the serial port, and finally controls the vibration mode on the waistcoat through the Bluetooth communication, thereby innovatively converting the radar input into the vibration mode, developing the corresponding distance-vibration algorithm, and allowing the blind people to acquire the spatial obstacle information in a motion sensing mode. Over a given adaption period, as the user’s brain learns, understands and integrates different vibration modes, the user can directly have the vision-like depth perception of the space in a sensory substitution mode on neuroscience.
Review and Prospect of Research on Innovation Thinking at Home and Abroad
Authors: Fang Zhi
Published: June 2020

Creative thinking is the core of creative ability, and the level of individual creative thinking ability is an important reflection of its creative ability. The article reviews the literature on innovative thinking at home and abroad, systematically sorts out and summarizes the concepts and characteristics of innovative thinking, summarizes the status and problems of innovative thinking research at home and abroad, and then puts forward the deficiencies of research including academic circles about innovation. The definition of the concept of thinking is not unified; there are different understandings of the characteristics of innovative thinking in the academic world; the number of innovative thinking studies is relatively small and the research direction is not clear; the macro-level research of innovative thinking training is insufficient and the countermeasures are not targeted. It also proposes future research directions for innovative thinking from strengthening theoretical research, strengthening macro- and micro-level research on innovative thinking cultivation, and strengthening scientific research activities as an important way to cultivate college students’ innovative thinking, to enrich the theory and talent cultivation of innovative thinking. Important decision-making reference.
A Comparative Analysis of Inhibitory Effect of Different Levels of Ya’an Tibetan Tea on Lipase
Authors: Xu Jingyi , Wang Weiyi , Du Mengze , He Chunlei , Bian Jinlin , Du Xiao
Published: June 2020

In this experiment, the inhibition effects in vitro and inhibition type of different levels of Ya’an Tibetan tea on lipase were studied by measuring its biochemical components, enzyme activity, and semi-inhibitory concentration. The results showed that the higher the grade of Ya’an Tibetan tea, the higher the content of water extracts, tea polyphenols, caffeine, free amino acids, soluble sugars and theabrownins. At the same tea soup concentration, the inhibition rate of all of Ya’an Tibetan tea on lipase showed an increasing trend with the increase of tea soup concentration. The IC50 of the semi-inhibitory concentration of inhibitory effect of each tea sample on lipase was greater than 20 mg. mL−1. The order of the inhibitory ability on lipase were Jixiang level one and Jixiang level three>Jixiang level two, Yixing level one and Yixing level three>Yixing level two. The inhibition types were all mixed type of reversible inhibition between competitive and non-competitive inhibition, which was closer to competitive inhibition. The inhibition was a mixed type of reversible competitive and non-competitive inhibition, which was close to the competitive inhibition. The results showed that different levels of Ya’an Tibetan tea had good inhibitory effects on lipase, and could be developed and used as natural lipase inhibitors.
Inhibitory Effect of the Theabrownin and Tea Polysaccharide Extracts of Dark Tea on Lipase
Authors: Xu Jingyi , Wang Weiyi , Liang Xing , Li Pinwu , Zou Yao , Du Xiao
Published: June 2020

In order to investigate the effect of theabrownin and tea polysaccharide of dark tea on reducing fat and weight, theabrownin and tea polysaccharide extracted from dark tea of the same level in different regions were studied in this experiment and p-nitro phenol method and enzyme kinetics method was used to analyze the inhibition effects of theabrownin and tea polysaccharide on lipase, and the inhibition mechanism of tea theabrownin and tea polysaccharide on lipase was explored. The results showed that theabrownin and tea polysaccharide of dark tea extracts had a good inhibitory effect on lipase. Among them, theabrownin extracts of Pu-erh tea had the best inhibitory effect, and the IC50 of the semi-inhibitory concentration was the smallest at 24.21mg .mL−1, which was significantly less than semi-inhibitory concentrations of theabrownin extracts from dark tea in the other three regions( P<0.01). The inhibitory effect of polysaccharide extract of Liubao tea was the best, and the IC50 of the semi-inhibitory concentration was the smallest, which was 58.57mg · mL−1. It is not significantly different from the semi-inhibitory concentration of the tea polysaccharide of Pu-erh and Kang brick, but it was significantly greater than the semi-inhibitory concentration of Fu-brick tea polysaccharide (P <0.01).The results of kinetic studies showed that the catalyst type of tea theabrownin extract of all teas was a mixed type, which contained competitive and non-competitive type in a reversible inhibition type. The catalyst type of tea polysaccharide extract of Pu-erh tea, Liubao and Tibetan tea tea were mixed types, which contained competitive and noncompetitive type in a reversible inhibition type. The catalyst type of polysaccharide extract of Fu-brick tea was a reversible inhibition type and its inhibition type was competitive inhibition. In conclusion, the theabrownin extract of Pu-erh tea and tea polysaccharide extract of Liubao tea had the best inhibitory effect on the lipase.
Analysis of main agronomic traits in different varieties of carrots
Authors: Chen Chunyan , Ma Jie , Ma Jun , Ma Wei , Yang Jiao
Published: June 2020

In this study, twelve varieties of carrots were evaluated for their main agronomic traits. Main agronomic traits were significantly different among distinct varieties. In detail, weight of single root ranged from 75.29 g to 278.56 g, diameter of single root ranged from 2.34 cm to 5.50 cm, and length of single root ranged from 14.85 cm to 24.10 cm. Moreover, according to carrot color, twelve varieties of carrots could be divided into five groups: purple (Tianzi), purple with orange core (Zishengzi, Hongzishen, and Yanzi), purple with yellow core (Zs-h, Zs-z, Cs-z, Caohaihong, and Zhongzidan), orange (Chengzishen), and yellow (Huangzishen and Zishenghuang). The color values (L
*, a
*, and b
*) of each variety were also investigated. And all carrots were conical shape. This information could be a theoretical basis for the research and extension of carrots.
Research on olid/liquid ratio and initial pH for Perna Viridis protein reacting
Authors: Zhang Yongli
Published: June 2020

Taking the degree of hydrolysis as the index, single-factor experiments of autolysis of P. viridis were conducted. The solid/liquid ratio and initial pH on the degree of autolysis were chosen, and the optimum conditions obtained in these experiments were liquid/solid material ratio of 1:3, and pH of 7.0.
Study on catalyst stability based on morphology and structure characterization
Authors: Zhang Yongli
Published: June 2020

In this experiment, the dissolution concentration of metal ions, SEM, TEM, and XRD were used as the stability evaluation index of the catalyst, and the activity and stability of the catalyst were further comprehensively evaluated. The catalyst Pd-catalyst was used to treat simulated printing and dyeing waste-water by CWAO method. The results shows that the morphology and structure of the Cu-Fe-Pd-La/γ-A12O3 (ratio 1:1:1:3) catalyst do not change significantly before and after the CWAO reaction, indicating that the experimentally prepared Pd-catalyst has better stability.
Research and implementation of single point focusing system based on planar array ultrasonic transducer
Authors: Liu Jinmeng
Published: June 2020

Ultrasound hyperthermia treatment is an advanced method of tumor treatment developed in recent years. Different from traditional tumor cutting and chemotherapy, it has the advantages of non-invasive, reducing patients’ pain and recovery time. The focus of ultrasound is one of the key technologies of this treatment technology. In this paper, a phased array ultrasound focus system is designed. Combined with the 256 element planar array ultrasonic transducer, the single point focus and three-point focus of ultrasound are realized by using time inversion method. The intensity distribution map is drawn by MATLAB, and the actual intensity distribution is detected by using the horizontal plane, which verifies the correctness of the method it can enhance the energy density of the emitted ultrasound and shorten the treatment time.
How to Determine the Size of Longitudinal-flexural Mode Linear Ultrasonic Motor
Authors: Wang Chen
Published: June 2020

Linear ultrasonic motor is more and more widely used. Based on the coupling of longitudinal and flexural mode, the piezoelectric stator induces the elliptical locus of contact points to drive the rotor. Now, how to determine the size of a linear ultrasonic motor is still an important problem. Here, we use Shi’s structure of the linear ultrasonic motor and reconstruct the finite element model by the parametric design language of APDL to execute modal, harmonic, transient and contact analyses. We find the frequency of longitudinal mode is only related to the length of the piezoelectric stator and the frequency of flexural mode is related to the length and width of the piezoelectric stator. Based on the results, we put forward a simple strategy to design the linear ultrasonic motor. We find that viscous damping is important to the coupling. Suitable viscous damping gives a large frequency band where the longitudinal and flexural modes are inspired simultaneously. Our results also give a minimum limit of the number of substeps in a period in transient analysis.
Effects of doping ions on the luminescence performance of terbium doped gadolinium polysulfide phosphor
Authors: Zhang Wenhua , Kou Huamin , Ge Lin , Zhang Ying , Lin Lin , Li Wei
Published: June 2020

Gd2O2S: Tb (GOS) phosphor screen has been widely used in digital X-ray imaging, and so far, numerous studies have been focused on the doping ions to improve the luminescence performance of the GOS phosphors. GOS: Tb, Dy phosphors were synthesized by the solid-state reaction process, and their phase composition, particle size, morphology and luminescence properties were characterized. The results showed that co-doping Dy3+ can promote the luminescence and the optimal doping concentration of Dy3+ ions were about 0.2%, however concentration quenching will occur when the doping concentration exceeded 0.5%. Ta5+ ion was also studied in the GOS: Tb and GOS: Tb; Dy phosphors prepared by the same method. The results showed that when the Ta5+co-doping concentration was 100ppm, the strongest emitted light intensity would be obtained for both phosphors. The photoluminescence spectra revealed a different influencing mechanism of Ta5+ ion comparing to Dy3+, which is by a strong energy transfer between Dy3+ and Tb3+.
Study of improvement in silicon bulk micromachining by metal assisted chemical etching
Authors: Guo Rensong , Huang Qiyu , Wang Shutang , Xu Jian , Cao Jiefeng , Lin He
Published: June 2020

Ensuring the integrity and uniformity of the fabricated structure is critical for silicon bulk micromachining. Our research demonstrates an efficient and low-cost method for silicon bulk micromachining by metalassisted chemical etching (MACE). The integrity and uniformity of the etched structures are greatly improved by the utilization of ethanol as the solvent instead of water. Our research helps to understand the mechanism of MACE, and can provide new ideas for the further study of morphology control of silicon block micromachining using MACE.
Oversaturation Overflow Detection at Intersections Based on Electric Police Data
Authors: Wang Hao , Wu Zhixin , Ju Jianmin , Huang Meixin
Published: June 2020

Traffic congestion is still an important problem that plagues the city. The “Deadlock” of the road network caused by the queuing overflow has a more serious for traffic. In the past, the overflow research was based on fixed detectors or floating car data with low sampling rate. It can only make rough judgments on queue overflow, and it is difficult to effectively support refined queue management. In recent years, the coverage of electronic police has become higher and higher, and the data has the characteristics of high sample rate and trajectory. Therefore, this paper is based on the electronic police’s license plate identification data to obtain travel time delay and vehicle relationship and building a queuing overflow model. Secondly, by constructing a VISSIM simulation model, and then judging the oversaturated queue overflow at the intersection library through the delay time, the validity of the model was verified by combining with the traffic data of Ningbo Zhenhai District. The research results provide theoretical basis and method support for road traffic queuing management.
Synthesis, Characterization and Dye-Sensitized Solar Cell Application of a Novel Symmetric Diphenylpyran Dye with Dual Rhodamine-3-acetic Acid Anchors
Authors: Wang Xinxin , Bolag Altan , Yun Wu , Zhang Xiaoying , Bao Tana , Ning Jun , Alata Hexig , Ojiyed Tegus
Published: June 2020

With simple three-step method, a new symmetrical metal free organic diphenylpyran dye containing dual rhodamine-3-acetic acid anchors was successfully synthesized, characterized and applied to dye-sensitized solar cells (DSSC). The dye has saturated methylene in its acceptor part, which makes the electron withdrawing group and the anchor group cannot be conjugated well. In addition, the exhibits lower molar extinction coefficients of the dye and its blue-shifted absorption spectrum also influenced the light capture ability. The resulting weaker intramolecular charge transfer and the electron coupling effect of the dye hindered the dye charge injection and shorten the electron lifetime, leading to an average power conversion efficiency of 0.65 % (Jsc
= 2.32 mA cm−2, Voc
= 448 mV and FF = 0.63). Further design of an efficient dye molecule needs efficient conjugation between the electron-withdrawing group and anchoring group, as well as an effective light harvest capability.
Review of research on durability of reactive powder concrete
Authors: Zhang Qing , Huang Liangxian
Published: June 2020

Insufficient durability is an important reason why sustainable concrete materials cannot be achieved. Reactive Powder concrete (RPC) has attracted wide attention of researchers due to its excellent durability. Therefore, a series of researches on the durability of RPC have been carried out in order to achieve sustainable development of concrete. Therefore, based on the research results of domestic and foreign scholars, the durability of reactive powder concrete is comprehensively discussed from two aspects: single factor effect and multi-factor coupling effect. Judging from the research results, whether under the action of single factor or multifactor coupling, reactive powder concrete has shown extraordinary durability performance, which proves its feasibility in creating durable concrete engineering; By summing up the existing research results, we also found its shortcomings, mainly including the lack of research on multi-factor coupling effects, especially the load-environment coupling effects, the lack of a micro-level description of the damage process, and the damage theory model is not yet clear, Evaluation methods, indicators are still to be studied and lack of actual data support and other issues.
Effects of antibiotics on anaerobic digestion resistance genes and archaeal communities in cattle manure
Authors: Zhang Xin , Zhang Kaiyu
Published: June 2020

In this paper, the effects of antibiotics on key enzymes genes of gas production pathway, diversity of microbial communities and ARGs changes during anaerobic digestion of cattle manure are investigated by adding antibiotics of different kinds and concentrations. TYL and SM2 increased the abundance of Methanosarcina in the acetic acid methanogens pathway by 29.04% and 52.79%, respectively, and CIP decreased the abundance of Methanobrevibacter and Methanosarcina. At the same time, CIP has a strong inhibitory effect on mcrA gene, and its abundance is 49% lower than that of the control group. SM2 increases ermF gene by 2 logs, and TYL and CIP by 1 log. Sul1 increased by 1-2 logs in the process of adding antibiotics to the anaerobic digestion process.
Parameter analysis and optimization of welding sequence for the aluminium alloy sidewall in a high-speed train body
Authors: Yu Kuigang , Wang Xianjin
Published: June 2020

The sidewall is the most complex structure and welding process part in the aluminum alloy train body, and its welding deformation is greatly influenced by welding sequence parameters. In this paper, the relationship between the welding residual stress and welding deformation of the sidewall and welding sequence parameters is studied, and the optimal welding sequence is determined. Using a verified finite element model of one intercepted sidewall, the relationships between the welding residual stress and welding deformation of the sidewall and the welding of welds, welding sequences of welds and the weld sequence are studied, respectively. Some conclusions can be drawn from the analysis results. One is that the welding results at one weld are only determined by self-welding, and have nothing to do with other welds, and welding results outside one weld are affected by welds on both sides. The second is that for a single weld, the from-one-end-to-the-other welding sequence is best, and the identical welding sequence is best for each weld. The third is that the fixed welds are firstly welded and a cross weld sequence is best.
Improve performance of soy protein adhesives with a low molar ratio melamine-urea-formaldehyde resin
Authors: Jiang Ke , Zhang Jialin , Xia Sanshan , Ou Chuan , Fu Chengang , Yi Maoyu , Li Wei , Jing Mingwei , Lv Wenxin , Xiao Hui
Published: June 2020

In this study, the low molar ratio melamine-urea-formaldehyde (MUF) resin and sodium hydroxide were used to modify soy protein adhesives, and the addition of MUF was studied as the influencing factor, the properties of soy protein adhesives, formaldehyde emission and bonding strength were studied. The results showed that the solid content and viscosity of the adhesives were suitable for the application of wood adhesives, the formaldehyde emission and wet shear strength of plywood prepared by soybean protein adhesive modified by MUF with 30% addition were 0.38mg/L and 1.25 MPa. Moreover, based on the analysis of the free formaldehyde content of the adhesive and the formaldehyde emission of plywood, it can be inferred that most of the free formaldehyde in the plywood was derived from the unreacted methyl group during the hot pressing process.
Temperature optimization of mold for autoclave process of large composite manufacturing
Authors: Hu Jian , Zhan Lihua , Yang Xiaobo , Shen Rulin , He Jiayang , Peng Nanfei
Published: June 2020

In autoclave processing, the temperature distribution of mold is important to the curing quality and performance of composite. The scale and complex structure of the mold have a great influence on heat transfer efficiency, which result in no uniform temperature field of the mold. Therefore, a method of heat transfer compensation is proposed, in which a “heat conducting fin” with high heat conductivity is installed in the section with slower heating process of the mold to improve the heat transfer efficiency of the mold and hot air, and to determine the structural size, quantity and reasonable installation position of “heat conducting fins” by combining CFD with heat transfer calculation. The results show that, combined with the typical panel mold, the heat transfer efficiency of the local section of the mold can be effectively improved by optimizing “heat conducting fin”, the maximum temperature difference of the mold surface is reduced by 15.1%, and the temperature gradient along the axial direction of the mold is decreased.
Preparation of Fe3O4/PVP magnetic nanofibers via in situ method with electrospinning
Authors: Teng Yu , Li Yuexiwei , Li Yingjuan , Song Qunling
Published: June 2020

Ferroferric oxide (Fe3O4) magnetic nanoparticles are easily agglomerated due to their large specific surface area, and cannot be uniformly dispersed in polymer fiber matrix fabricated from electrospinning solution. In order to obtain uniform dispersion of Fe3O4 in composite nanofibers, a new method is used by mixing organic precursor of ferroferric oxide iron acetylacetonate (Fe (acac)3) and organic polymer polyvinylpyrrolidone (PVP), then subjected nanofibers through electrospinning and formed ferric oxide/polyvinylpyrrolidone (Fe3O4/PVP) fibers via in-situ calcination at low temperature. The morphology of the fibers and the dispersion of Fe3O4 particles in the fibers were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The crystallization of the magnetic fibers was characterized by X-ray diffraction (XRD). The vibrating sample magnetometer (VSM) was used. The magnetic measurement of the fiber shows that the magnetic nanofibers have better superparamagnetism, which are expected to be used as a drug-loaded magnetic cloth in the field of biomedicine.
A method of sample enhancement based on partial discharge PRPS spectrum
Authors: Tang Qi , Wu Lihui , Luo Rongbo , Li Guowei , Wang Junbo , Li Xiaolong , Yan Shisong
Published: June 2020

In this paper, we summarize the problems existing in the traditional partial discharge PRPS sample enhancement method, and propose a method based on the partial discharge PRPS spectrum sample enhancement, including threshold denoising, noise superposition, data density, data sparsity, phase shift, data enhancement method matrix and so on. It solves the problem that the difficulty of collecting the spectrum of partial discharge cases restricts the application of intelligent algorithms such as deep neural network. The practical application shows that the local partial discharge PRPS spectrum sample enhancement method can effectively enhance the sample size, make the sample distribution uniform and representative, and the deep learning neural network model trained by the sample set has high accuracy and generalization ability for PRPS spectrum diagnosis.
Practical Simplified Computing Method of Natural Vibration Frequency of Cable-stayed Bridge during Construction Stage
Authors: Wang Xingnai , Li Peijian
Published: June 2020

In this paper, the vibration analysis model of the cable-stayed bridge is established by using double-mass method, and the formula for calculating its natural frequency during construction is deduced. On this basis, the formula is simplified to obtain the estimation formula of the natural vibration frequencies of the cable-stayed bridge during construction. The structure analysis software MIDAS Civil is used to establish the three-dimensional finite element model of the cable-stayed bridge of Jinan Qihe Yellow River Bridge to analyse the vibration characteristics of Qihe Yellow River Bridge during the construction stage, carry on the spot tracking of the modal test of the construction phase, and at the same time calculate the frequency by using the double-mass method and the estimation formula. The double-mass vibration model, the natural frequency estimation formula, the finite element method analysis and the field modal test results are compared and analysed. Both the test results and the calculated results show that the finite element method can accurately simulate the actual force state of the bridge, and the double-mass model and the estimation formula provide a more accurate and efficient method for calculating the natural vibration frequencies, which provides reference for guiding design and construction monitoring work of the cable-stayed bridge.
Study on Gold Extraction Process of Printed Circuit Board Based on Thiourea Method
Authors: Deng Chao , Xiang Pengzhi , Liu Longjiang , Huang Yao
Published: June 2020

The printed circuit board is rich in recyclable metals Cu, Au, Ag, Pt, Pb, etc. The precious metals such as gold are extracted from it, which is in line with the concept of resource recycling. In this paper, the theorem method was used to extract gold from waste circuit boards. The effects of reaction time, reaction temperature, theorem concentration, and Fe3 + mass concentration on gold leaching rate were investigated. The results showed that the pH was controlled at about 1, the theorem concentration was 0.12 mol/L, FeCl3 was 0.024 mol/L, the stirring speed was 300 r/min, and the leaching time was 2 h. Under the above conditions, the gold leaching rate reached 90.37 %. The theorem gold extraction method has certain potential application values due to its rapid gold dissolution, low toxicity during leaching, low price, high efficiency, and environmental protection.
Study on Mechanical Properties of Main Girder of Continuous Box Girder Bridge Strengthened By A Cable-Stayed System
Authors: Xu Gangnian , Wang Laiyong , Du Yefeng , Chu Cunji
Published: June 2020

The local stress concentration of the main girder during the tensioning construction of the continuous box girder bridge strengthened by the cable-stayed system is more prominent, which may lead to the sudden damage of the structure. Therefore, this paper studies the key section stress and deformation of the main girder in combination with the real bridge test. The results show that the maximum tensile and compressive stress increase of the main girder appears at the root floor and midspan floor; The tensile action strengthens the compressive stress between the anchorage point of the long cable and the anchorage point of the short cable to the top of the pier, which releases some of the compressive stress across the mid-slab, improves the stress state of the main girder, and improves the shear load of the main girder ability; With the increase of the cable force, the main tensile stress of the web in the anchoring area first increases and then decreases. The lifting amount of the midspan section of the main girder accounts for 20.06% of the total deflection, and the effect of the cable-stayed system on improving the deflection of the main girder is obvious.
Strength analysis of LNG tank container for trains under inertial force
Authors: Wang Zhiqiang , Qian Caifu
Published: June 2020

As transportable pressure vessel, LNG tank container used in trains bears not only the static load, but also inertial load during transportation. The finite element method is commonly used in the design of tank containers subjected to inertial force. In this paper, a finite element model for 1AA LNG tank container was established using the ANSYS software, stress analysis and strength assessment under five load cases were performed for the tank container. The results show that the Mises equivalent membrane stress at the frame is controlled by the inertial force but at the inner vessel, however, it depends on the internal pressure although it may be significantly affected by the inertial force in some cases.
Study on mechanical behavior of new steel members of cable-stayed strengthening system
Authors: Xu Gangnian , Wang Laiyong , Zhang Jianjuan , Dong Xu
Published: June 2020

In the tensioning construction of continuous box girder bridge strengthened by a stay cable system, local stress concentration of steel joist and bracket is easy to be caused. This paper studies the stress and deformation of key section of steel joist and bracket by combining with real bridge test. The results show that the maximum stress of steel joist and bracket is less than the allowable stress. When the tensioning force value is 2.66 times of the completion cable force, the bottom plate first reaches the yield strength, and the stress change law of the bracket is not strong. The mid-span deformation of the steel joist in the early period of tensioning is gentle, and the change in the later period is large. When the tensioning force reaches the completion cable force, the value is about 1/400 of the span. In the early tensioning period, the relative displacement between the steel bracket and the girder is large, but the change in the later tensioning period is not large.
Image recognition based on water hyacinth controlled breeding monitoring equipment
Authors: Feng Zhongao , Pan Fei , Li Yuqi
Published: June 2020

The use of image recognition, designed a kind of intelligent monitoring of water hyacinth growth monitoring device, this device realizes the automatic identification of water hyacinth growth status and scope, through image recognition of collecting water hyacinth images into water hyacinth growth related data, after the data through the Internet of things push to the terminal, to achieve the objective of the auxiliary water hyacinth controlling farming work. The water hyacinth controlled planting and breeding monitoring equipment designed in this project has good practicability and promotion value. It can be applied to water hyacinth controlled planting and breeding and water control project, which can effectively solve the problem of large workload and untimely supervision of water hyacinth, and is conducive to promoting water hyacinth to water control work.
Modal Analysis and Experimental Study of Marine Gear Box
Authors: Liu Renlong , Qiu Binbin , Zhao Jiebo , Cui Hongbin
Published: June 2020

In this paper, the finite element model of marine gearbox is established, using Lanczos method performed the modal analysis of the gearbox system mathematical, the modal frequencies and modal shapes of each order of the box were obtained, and the modal experiment of marine gearbox is carried out. The results show that by comparing the data obtained from the experimental modal analysis with the theoretical calculated values, it is verified that the theoretical analysis values and experimental test values are in better agreement, and the maximum frequency error is 4.04%, the fea model is reliable, thus theoretical model could better reflect the natural vibration characteristics of the box on the marine gear box.
Experimental study on side pole collision and deformable barrier collision of car
Authors: Huang Zhigang , Zhang Bin , Wang Linmin , Liu Cancan , Zhang Xiangle
Published: June 2020

In order to study the characteristics of side pole impact and side deformable barrier impact test, a B-class car is selected to carry out the side pole impact test in Euro-NCAP and side deformable barrier (AE-MDB) test in C-NCAP. The characteristics of body acceleration and dummy injury are analyzed. The results show that compared with the deformable barrier collision, the side pole collision has a greater risk of injury to passengers for vehicle body acceleration, at the same time, the intrusion is greater and local deformation is more serious. In order to reduce the side impact damage, it is necessary to increase the local strength of the body at the side of collision to avoid small area overlapping rigid collision.
Based on the lattice structure of the sandwich structure of 3D printing
Authors: Chen Hantang
Published: June 2020

Lattice structure materials have great advantages in thermal, electrical and optical properties, and as a potential lightweight materials have attracted much attention. The inherent complexity of lattice structure makes 3D printing technology and its manufacturing have a natural junction. One of the advantages of 3D printing is that its flexibility and printing cost are insensitive to the complexity of products, so complex lattice structure has become a hot research direction in the field of 3D printing. In this project, we proposed a new lattice sandwich structure, and further studied its mechanical properties, explored its mechanical properties in three-point bending experiment, and prospected its specific application in engineering.
The principle of fatigue model test for spur gears based on similarity theory
Authors: Zhu Chengli , Wang Xiaofang
Published: June 2020

Spur gear fatigue bench test is an expensive and time-consuming process. Especially for the big spur gears, the installations and measurements of them are usually very difficult. In order to solve this problem, this paper analysed the similarity principles of geometry, contact stress, bending stress, number of cycles and other factors for spur gears. The principle of fatigue model test for spur gears is proposed based on similarity theory. It is the basis of spur gear fatigue model test.
Research on Flexible Job Shop Scheduling Problem
Authors: Li Xiangnan , Liang Xu
Published: June 2020

The adjustment time and processing time of the job on the machine are studied as an independent factor considering the influence of the adjustment time, such as installation and positioning, on the efficiency of production scheduling. A mathematical optimization model of flexible job shop scheduling with adjustment time is established based on minimizing the makespan. The improved genetic algorithm is used to solve the proposed model and achieve rapid optimization of the solution process. The Matlab software platform is used to solve the case. The experimental results show that the model and the improved algorithm are feasible and effective, and could be more effective in guiding the actual production.
Simulation and research on some buildings in Ningbo
Authors: Peng Youtian
Published: June 2020

Simulation is the imitation of the operation of a real-world process or system over time. The act of simulating something first requires that a model be developed; this model represents the key characteristics or behaviors of the selected physical or abstract system or process. The model represents the system itself, whereas the simulation represents the operation of the system over time.
Dynamic Response Analysis of Tubular String under Perforating Gun-shock Loads
Authors: Liu Hongtao , Dou Yihua , Cao Lihu , Cao Yinping , Xue Yanpeng
Published: June 2020

To obtain the dynamic response of perforating string under gun-shock loads, a dynamical model was established based on the vibration mechanics theory of cantilever beam, and the differential equations of longitudinal vibration were deduced. The dynamic response was obtained according to the measured data of impact loads. The results show that vibration response of displacement, velocity, and acceleration were changed with a cycle of 15ms. The Von Mises stress near the packer is the largest owing to stress concentration. The analytic solution of natural frequency is close to the finite element analysis value, and the maximum relative error is below 5%.The velocity of stress waves propagating along the string approximates 5000m/s, which is close to the theoretical analysis value and is about 3.6 times that of sound velocity in water.
Study on Risk Evaluation of Acetochlor Production Process
Authors: Wang Yunna , Cao Qinggui , Qiu Xiaoxuan , Liu Qing
Published: June 2020

To scientifically evaluate the danger of acetochlor production process, this article identifies and analyzes dangerous and harmful factors in a company’s factory from dangerous and hazardous substances, equipment, and places, etc, fire, leakage and explosion are the main risk factors of the plant. Taking the ethanol storage tank leakage in the storage area as an example, the FLUENT software was used to simulate the leakage of ethanol, and it was found that the leakage outlet emitted a concentration of more than 8% and migrated to the windward side, which was extremely prone to vapor cloud explosion. Then, the TNT equivalent explosion model was used to calculate that the vapor cloud explosion may cause the death radius, severe injury radius, and minor injury radius to reach 57.27m, 138.39m, and 252.21m. At the same time, the radius of explosion damage under other overpressures was calculated. Based on this, suggestions for targeted safety countermeasures can be provided, which can provide a reference for accident prevention and emergency treatment.
Simulation study on influence of coating thickness on cutting performance of coated ceramic cutting tools
Authors: Wang Huijun , Zhang Jingjie , Yi Mingdong , Xiao Guangchun , Chen Zhaoqiang , Sheng Changchao , Zhang Peng , Xu Chonghai
Published: June 2020

The processes of cutting gray iron with coated ceramic tools were simulated using the cutting simulation software named AdvantEdge. The effect of coating thickness on cutting temperature, cutting force, and maximum equivalent stress of cutting tools were investigated. Firstly, a finite element cutting simulation model was established to investigate the influence of coating thickness of coated ceramic tools. The cutting simulation model was verified through cutting gray iron experiment. And the model has validity. Both the simulation and experimental results showed that the cutting temperature, cutting force and the maximum equivalent stress were obtained to be minimum when the coating thickness was 2 μm, reaching 444.5 °C, 102 N and 1949.8 MPa, respectively. Finally, the relationship between the interface characteristics and cutting performance of coated ceramic tools were qualitatively described by the functional relationship between the maximum equivalent stress and the coating thickness. Since the maximum equivalent stress of the tool can reflect the tool wear condition, the optimum coating thickness can be obtained corresponding to the minimum tool wear using the relationship between the maximum equivalent stress and the coating thickness.
Preparation and Characterization of a large-scale gold nanofilm
Authors: Tang Junqi , Ge Linlin , Xu Xiansheng
Published: June 2020

Large-scale nanofilms were of great interest in the field of nanophotonics, mainly due to their unique optical properties. Two dimensional (2D) large-scale gold nanofilm was fabricated by an interface self-assembly method based on sodium citrate-capped gold nanoparticles (AuNPs). AuNPs was firstly characterized by UV-vis spectra and transmission electron microscopy methods. The prepared large-scale gold nanofilm was characterized by scanning electron microscopy technology. We expected this method and the prepared nanofilm would apply in biosensors and functionalized optical devices.
Application of New Waterproof Quick-drying Sports Green Material in Clothing Design
Authors: Sun Mengjie
Published: June 2020

In order to provide a theoretical basis for the study of moisture-absorbing and quick-drying clothing, this paper selects 6 kinds of knitted fabrics (6 types of moisture-absorbing and quick-drying fabrics, 1 type of pure cotton fabrics and 1 type of pure polyester fabrics) and makes them into garments for comparison. the study. A liquid water dynamic transfer performance tester (MMT) and a moisture permeable cup were used to evaluate the wet transfer performance of the samples. The sweat dummy and subjective evaluation methods were used to study the thermal and wet comfort of the clothing samples. This paper studies the application of green materials for waterproof and quick-drying sports in apparel design.
Research on the security Oblivious Transfer protocol based on ECDDH
Authors: Wang Xiaotian , Li Zichen
Published: June 2020

A new type of Oblivious Transfer protocol is designed under the assumption of ECDDH. The protocol can be safely implemented under a malicious model, 1 of which are selected in N input values. The RAND function is defined under this assumption, and the security definition is given. Then, the security interaction mode of the sender and receiver is constructed. Finally, the correctness of the Protocol is analyzed and the security proof is given. The protocol has the interaction complexity of the constant number level, and the computational and communication complexity is only related to n linearity.
Jamming Analysis and Simulation of Active Jamming on Pulse Radar Fuze
Authors: Li Dong , Zhu Xiaofei , Shen Xiaowei , Zeng Zhenjie
Published: June 2020

Pulse radar fuze is widely used at present. The jamming and anti-jamming of radar fuze have always been the focus of modern electronic countermeasures. The working principle of pulse radar fuze and the jamming mechanism of three typical active jamming to radar fuze is analyzed, and the jamming effect is simulated. The simulation results show that the pulse radar fuze has a certain anti-jamming ability to suppress radio frequency noise; The anti-jamming measures of variable period has a good anti-jamming effect to range deception jamming; After the density of dense false target jamming reaches a certain degree, it can exert an effective influence on the pulse radar fuze.
Air-Cycle Energy-Saving IH Rice Cooker Based on Phase Change Heat Storage
Authors: Li Lu , Yang Chenglong
Published: June 2020

This device combines phase change heat storage with air circulation, and proposes a new three-dimensional honeycomb grid structure on the phase change material carrier structure. The reasonable use of steam residual heat and the use of a segmented electromagnetic coil structure reduce the heat loss and power consumption of IH rice cooker. Utilizing the hot steam generated in the heating stage of the rice cooker, the low-temperature waste heat is recycled in the low-temperature phase-change thermal storage module designed by the device. At the same time, the electromagnetic coil is segmented. Besides, the fuzzy control is used to determine the actual amount of rice to be cooked to determine the number of coil segments used in the heating stage to reduce power consumption.
Study on UPLC Fingerprint of Lophatherum Gracile Brongn
Authors: Yang Xiaosong , Kong Juan , Zhang Lingling , Wang Xiangpei , He Xiaomei , Wu Hongmei
Published: June 2020

Objective: To establish UPLC fingerprint of Lophatherum gracile Brongn and provide reference for quality evaluation of Lophatherum gracile Brongn. Method: Agilent ZORBAX Eclipse Plus C18 (2.1mm × 100mm, 1.8 μm) chromatographic column, Mobile phase acetonitrile-0.1% phosphoric acid water, gradient elution, flow rate 0.1 mL·min-1, column temperature 30°C and injection volume 1μL. Results: There are 20 common peaks in the chromatographic fingerprint of 10 batches of Lophatherum gracile Brongn at 270 nm, and the similarity is between 0.890-0.974. Conclusion: The UPLC fingerprint method established in this study is efficient, fast, specific and characteristic, and the sample information is rich, which can provide reference for the quality evaluation of Lophatherum gracile Brongn.
A Novel Improved K-Means Algorithm Based on Parameter Adaptive Selection
Authors: Huang Xiaodi , Ren Minglun , Zhu Xiaoxi
Published: June 2020

As a classical clustering algorithm, K-means has been widely applied due to its features of simple mathematical thinking, fast convergence rate, less complexity, and easy to implementation. However, K-means algorithm always requires users to set the desired number of clusters in advance, and the initial cluster centers are usually generated in a random way. When dealing with unknown datasets that users do not have enough domain-assisted knowledge, such parameters setting strategies not only increases the burden on users, but also makes clustering quality difficult to guarantee. Therefore, in view of the high sensitivity of K-means clustering process to initial parameters, this paper propose an improved DDWK-means (Distance-Density-Weight K-means) algorithm. Based on the distance-density feature and the method of inertia weight of particle swarm optimization algorithm, the optimal initial cluster centers not only can be determined adaptively according to the structural characteristics of the dataset itself without introducing artificial parameters, but also can be adjusted dynamically due to the threshold change of clustering quality metric. We make an experimental study with five standard datasets from UCI (University of California Irvine), and the results indicate that the DDWK-means algorithm exhibits a significantly improvement in clustering efficiency and stability.
Application Discussion and Inspection on the Unintended Car Movement Protection System
Authors: Kong Lingxiang , Zhao Lidan , Wang Shuijun , Jiang Jie , Wu Haiping
Published: June 2020

As the amount of using elevators and annual elevators grows, the injury accidents still happen frequently every year under the circumstances of elevator manufacture and maintenance available. Most accidents result from the failure of door system and breaks which causes shearing and crushing. The Unintended Car Movement Protection System (UCMP) is listed into the national mandatory criteria to prevent injury accidents. In this paper, the composition of UCMP is simply analyzed, and inspection method is discussed.
Construction of New Agricultural Products E-commerce Platform and Analysis of Its Functional Requirements
Authors: Huang Bingchao , Fang Xuan , Lin Ruiqi , Maalla Allam
Published: June 2020

Under the background of the Internet era, the deep integration of e-commerce technology with modern agriculture and dietary consumption has revolutionized the traditional living habits of urban people. The new agricultural products e-commerce platform meets the practical functional needs of modern social agricultural products supply, e-commerce platform, and consumer users, and establishes an independent, new-based agricultural e-commerce food chain based on the consumption target and data-based sales process. The KANO model is used to analyze the impact of user requirements on user satisfaction, reflecting the nonlinear relationship between product performance and user satisfaction, analyzing the number of user choices corresponding to different demand attributes, revealing the user’s expectations of their functional requirements, and establishing product objective. The relationship between performance and user perception, fostering new formats and innovative public service models and promoting the transformation of the catering operation model.