bluuebunny/crossref_metadata_2025_split huggingface dataset:
Overview of Lower Extremity Exoskeleton Technology
Authors: Jiang Wei , Ma Baobo , Zhang Xinming , Liu Hui , Wang Zhanwen 
Published: April 2021

Abstract
The exoskeleton is wearable robot that can enhance the power of the wearer in various environments. The research goal of power-assist exoskeleton is to make it become more powerful, faster and more comfortable wearing experience. So far, some of the key technical problems are still not achieved practical breakthrough.
Preparation Technology of Water Based Detergent for Q235 Carbon Steel
Authors: Jia Wenqi , Zhen Ran , Liang Bo , Du Ye , Yang Kun , Zhang Ming , Liu Fei 
Published: April 2021

Abstract
Q235 carbon steel is smelted by a converter or open-hearth furnace. However, it is always speckled with oil in the manufacturing process influencing its use performance. In the paper, a water-based detergent, a variety of surfactants and additives, was used to remove the oil. First, the three remarkable surfactants were selected through single-factor experiment. Then, surfactants composition was obtained by simplex formula design. Finally, the optimum formula of metal cleaner was obtained by the uniform experimental design: FMEE 1%, MOA5 2.4%, 6501 2.6%, foam inhibitor 3%, antirust agent 2.4%+AES 2%+ carboxylic acid inhibitor 1.7%+copper corrosion inhibitor 2.1%+ detergent auxiliary 1.9%+water 80.9%. The cleaning efficiency can reach more than 98%.
Efficient Distortion Prediction of Laser Melting Deposited Industrial-scale Parts Using Modified Inherent Strain Method
Authors: Duan Chenghong , Cao Xiankun , Luo Xiangpeng 
Published: April 2021

Abstract
As a result of the large temperature gradients, residual distortion becomes a major technical challenge for laser powder-based Laser Melting Deposition (LMD) process, since excessive distortion may cause building failure, cracks and loss in structural integrity. In this paper, the theory of a modified inherent strain method is firstly developed. On the basic of this method, the prediction results of a small-scale model are compared with those obtained from the traditional thermo-mechanical coupled analysis. The deviation of the maximum distortion predicted by the modified inherent strain method is 7.72%, and the average deviation of the distortion of the substrate’s free end is 8.73%, demonstrating a good accuracy (< 10% error) of the modified method for predicting the residual distortion of the LMD components. Compared to a small loss of accuracy, the calculation time is significantly shortened by the modified inherent strain method. After verification, the distortion prediction of industrial-scale camshaft model during LMD process is realized by using the proposed method. It is found that the maximum distortion is 3.18mm, located at both sides of the camshaft. After the support is removed, the two ends of the camshaft are warped upward, while the position of the maximum distortion doesn’t change, but the value increased to 4.62mm. Moreover, the whole analysis takes only 3300 seconds, which is extremely significant for the distortion prediction for industrial-scale parts fabricated by LMD.
The Testing Method of Graphene Oxide (GO) and NAA Ramification
Authors: Hu Shuai , Xu Jiankang , Zheng Zheheng , Jia Yusheng , Fan Zheyong , Ozcan Arif 
Published: April 2021

Abstract
Organic/inorganic supramolecular system has been obtained by graphene oxide grafting with a-cyclodextrins (a-CDs) and NAA ramification. Tourer transform infrared spectra (FTIR), thermogravimetric analyse (TGA), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and X-ray photoelectron spectroscopy (XPS) were employed to identify the characters and morphology of the supramolecular structure. The features might make our supramolecular hybrid hydrogel a pretty candidate in a drug delivery system.
Frontier Analysis of the Application of New Materials in Competitive Sportswear
Authors: Sha Jin , Zhao Yongjun 
Published: April 2021

Abstract
Under the social background of national fitness, the sportswear industry has also developed rapidly. In order to improve the performance of sportswear, people have developed a series of new materials. Today, with the rapid development of textile materials, the use of high-tech materials can increase the added value of competitive sportswear. This paper briefly describes the new sports technical materials currently on the market, and classifies them according to design requirements, and discusses the application prospects of new materials in competitive sportswear. This paper proposes an intelligent phase change temperature control material; it is a new type of functional material, it is a product that combines phase change materials and textile weaving technology, it has two-way temperature control function, and this paper explores the application of this material competitive sportswear.
Study on production technology and surface morphology of carbon fiber
Authors: Zheng Xiongling , Li Chenyang , Zhang Qian , Wang Chen , Yue Qinchi 
Published: April 2021

Abstract
Since the 21st century, China’s carbon fiber industry has begun to develop rapidly. The research and development of carbon fiber is a major project related to national strategic security. Carbon fiber production technology has been mature, among which PAN based carbon fiber has the largest capacity. However, compared with the imported carbon fiber materials, there is still a certain gap in the performance of domestic carbon fiber materials. The purpose of this paper is to compare the properties of domestic carbon fiber and its composites. Firstly, the production process of carbon fiber is introduced, including monomer polymerization, spinning, oiling, preoxidation, carbonization, graphitization and other steps. Then, the T700 Carbon Fibers of Toray, Japan and two kinds of domestic T700 Carbon Fibers of Hengshen and Weihai were characterized and analyzed, and the surface morphology of three kinds of carbon fibers was compared. It is found that the domestic carbon fiber of Weihai adopts the similar technology of thousand spray wet spinning, and the fiber surface is smooth. However, Hengshen carbon fiber adopts the wet spinning process. There are grooves on the surface of the fiber, which will increase the mechanical meshing force between the fiber and the resin, and have a positive significance for the interface performance of the composite. However, it will increase the probability of fiber defects, such as fine lines, and have a negative impact on its tensile properties and other mechanical properties.
Optimization of headspace solid phase microextraction conditions and composition analysis of volatile constituents from Trifolium pratense L. leaves
Authors: He Chunlan , Zhou Ping , Zhang Gangping , Yang Zhao 
Published: April 2021

Abstract
Objective: To analyze the volatile constituents in the leaves of Trifolium pratense L. and to explore the effects of different factors on the extraction efficiency. Methods: The volatile components were extracted by the headspace solid phase microextraction (HS-SPME) method and analyzed by gas chromatography-mass spectrometry (GC-MS), and the relative content of the components was calculated by the area normalization method. Results: The best headspace solid phase microextraction conditions of the volatile components of the leaves of Trifolium pratense L. were as follows: 50 μm DVB/CAR/PDMS extraction head was used, the extraction temperature was 70 °C, and extraction time was 40min. 82 compounds were identified from Trifolium pratense L. leaves by GC-MS, accounting for 93.02% of the total volatile components, and the total peak area of volatile components was 2.31x109. The compounds with higher content and active activity were beta.-Caryophyllene (6.48%) and Naphthalene, decahydro-4a-methyl-1-methylene-7-(1-methylethenyl) (4.11%). Conclusion: The type of extraction head, the extraction temperature and the extraction time have great influence on the extraction effect. The HS-SPME-GC-MS method is suitable for the rapid extraction, separation and analysis of the volatile components of the leaves of Trifolium pratense L.
Study on the Crystal Structure and Genetic Structure of Eggshell
Authors: Liao Bing , Li Meiqi , Liu Yinan , Ning Zhonghua 
Published: April 2021

Abstract
Eggshell provides a relatively independent and stable internal environment for embryo growth and development, and is also a source of calcium ions required for embryo development. Eggshells of good quality can reduce the risk of food safety to a certain extent, and can also reduce the economic losses caused by broken eggshells and improve economic efficiency. At the same time, the process of eggshell formation is also a classic biomineralization model. In this study, the 600K high-density SNP chip of chicken was used to perform SNP typing on several groups obtained by the reciprocal cross between Bailaihang and Dongxiang green-shell hens. Scanning electron microscopy and X-ray crystal diffraction were used to determine the ultrastructure and eggshell ultrastructure. Crystal structure, explain its genetic basis, and explore the relationship between eggshell ultrastructure and crystal structure. This study believes that the DERA gene plays an important role in regulating the growth of eggshell crystals. There are three possible ways of action: one is to provide energy for the synthesis of uterine tissue cell matrix protein and its transport with ions; the second is to reduce the stress of high Ca2+ concentration stress, maintain cell activity, and for the growth of eggshell crystals Stably provide the required Ca2+; third, by regulating the concentration of ATP in the uterine fluid, the effect on the growth of eggshell crystals.
Application and Research of Analytical Chemistry Technology in Food Safety Testing
Authors: Kang Hongling , Liu Yinan , Hu Shuang , Liu Xin , Wang Man , Sun Wan , Chen Lihua , Yan Rong 
Published: April 2021

Abstract
Food safety problems occur frequently, and the food safety problems of major enterprises are continuously reported. Therefore, food safety quality and how to test food safety have become the focus of people’s attention. The technical testing of food safety is mainly achieved through chemical means, but with the continuous development of science and technology, the disadvantages of chemical testing technology continue to appear, so how to improve the chemical testing technology has become a difficult problem to be overcome in the technical field. The thesis focuses on various chemical technologies in food safety testing, such as electrochemical immunosensors, liquid chromatography detection, pigment rapid testing instruments, nucleic acid aptamers, etc., and selects several items for detailed description.
Simulation Experiment on Tunnel Lighting Aided by High Diffuse Reflectance Materials
Authors: Ren Yuhao , Su Minxin 
Published: April 2021

Abstract
The existing tunnel lighting calculation methods only consider the effect caused by direct light source and ignores the reflection effect of light flux emitted by lamps inside the tunnel closed pipe, which is not conducive to the energy saving and safety of tunnel lighting.In this paper, a tunnel illumination calculation method considering the reflection increment of tunnel sidewall is proposed. This method is based on the diffuse reflection coefficient of tunnel sidewall material which can characterize the reflection characteristic of its surface, so as to calculate the illuminance of road surface.Matlab software was used to simulate the real lighting environment of the tunnel with energy storage luminescent material as the side wall. It was found that the increase of reflection caused by high-quality tunnel interior materials could effectively improve the tunnel lighting
Antidepressant-Like Effect of Bupleurum Paeonia Liujunzi Decoction on Depression Model Mice and its mechanism
Authors: Xing Zhiyu , Liu Shengli , Xu Chang , Xiao Junke , Liu Jihong , Li Li , Gao Xiaoyao , Wang Zirui , Zheng Qingting , He Yuting , Lv Shaohui , Gao Chaopeng , Li Xiaobing 
Published: April 2021

Abstract
To investigate the behavioral effects and mechanisms of Bupleurum Paeonia Liujunzi Decoction (BPLD) in depression model mice. Twenty male Kunming mice were randomly divided into four groups: blank group, model group, fluoxetine group and Bupleurum Paeonia Liujunzi Decoums combined with reserpine gavage. Fluoxetine group were given fluoxetine treatment at 2mg/kg/d and Bupleurum Paeonia Liujunzi Decoctiction group. Depression model mice were induced by the chronic unpredictable mild stress (Con group were given BPLD treatment at 8g/kg/d. The model group and the blank group were given normal saline once a day. The experiment lasted for 7 days, during which the general state (body weight, hair color, etc.) was recorded and the changes were observed. The serum levels of norepinephrine (NE) and dopamine (DA) were detected by ELISA kit. Compared with the model group, the body weights of the diazepam group and the Chinese medicine group were significantly increased (P<0.01). In addition, it produced the concentrations of NE and DA in the serum were significantly increased (P<0.05) in the two groups. Bupleurum Paeonia Liujunzi Decoction has obvious therapeutic effect on depressed mice, and its mechanism may be related to the increase of NE and DA concentrations.
Study on desulfurized gypsum used as cement retarder
Authors: Zhou Jianmei 
Published: April 2021

Abstract
The effects of desulfurized gypsum, heat-treated desulfurized gypsum and hydrogen peroxide modified desulfurized gypsum on the setting time of Portland cement were studied. The results showed that when the content of desulfurized gypsum after 80 °C heat treatment was 4% of Portland cement, the initial setting time was 136min, and the final setting time was 196min, which met the requirements of cement. Compared with natural gypsum, the retarding effect of desulfurized gypsum on Portland cement is more significant at the same dosage. The desulfurized gypsum treated with hydrogen peroxide can improve the stability of cement. When the proportion of desulfurized gypsum and natural gypsum is 1:1 and the content is 3%, it has a better retarding effect on Portland cement.
The Atomic Structure of the Se-Passivated CuInSe2
Authors: Guo Yu , He Zhenni , Wang Yang , Yang Rui , Wang Junling , Ran JunChao 
Published: April 2021

Abstract
Through the first-principles calculations, we studied the atomic structure of Se-passivated CuInSe2. It is revealed that, the CuInSe2 can be passivated by selenium, under Se-rich condition, the structures with a full Se layer plus dimerized Se adatoms are favored. The formation energy of Se-terminated surface and the surface with Se overlayer are different, the formation energy of the surface with Se overlayer is more lower than the pure Se-terminated surface, that is to say, the surface with Se overlayer is more stable. On the other hand, the atomic structure of the Se-passivated CuInSe2 are also different from the atomic structure of the pure Se-terminated surface. Studying the structure of the Se-passivated CuInSe2 is very helpful for the high-efficiency solar cells.
Finite element analysis of stress concentration coefficient of internal pressure conical shell
Authors: Yuan Tong , Jin Zhaowen , Zhu Hongyu 
Published: April 2021

Abstract
Based on the analysis and design idea, we use the finite element method to evaluate the dangerous position of the conical shell opening structure, select the stress concentration coefficient of the opening as the research object, analyze the influence of different opening angle and with/withput a connecting pipe on it, and seeks the optimal design of the conical shell opening. The results show that the nozzle has a certain weakening effect on the stress concentration of the opening, and when the opening angle (the angle between the center line of the opening and the generatrix of the conical shell) is around 90° , the nozzle has a more significant strengthening effect on the structure. It also shows when the opening rate is fixed, the stress concentration coefficient of the opening decreases first and then increases with the increase of the opening angle, and when the opening angle is in the range of 80 ° to 110 ° , the stress concentration coefficient is the smallest between 2 to 3.
Microstructure and Properties of Laser Cladding Coating on the Surface of Superalloy Ti600
Authors: Jin Zhaowen , Wang Hong Bo , Yuan Tong 
Published: April 2021

Abstract
The laser cladding technology was used to prepare the Ti / TiB2 composite coating on the surface of Ti600, and the microstructure and performance test results of the coating obtained under different laser specific energy conditions were analyzed. Studies have shown that the laser cladding coating and the substrate have achieved a good bond, and TiB2 has formed into cellular TiB2 after melting, and further solid solution becomes a whisker structure. The diffused TiC and TiN nuclei in the middle of the coating were fully grown and developed a dense dendrite structure with TiB2 particles. A dual-phase structure of granular TiB2 and many lamellar structures was formed under the coating. When the laser specific energy is 20 kJ / cm2, the coating reaches the highest microhardness of 990HV, nearly 2.5 times the hardness of the substrate. The amount of wear shows a monotonic decrease with the increase of the specific energy of the laser, and the average friction coefficient shows a monotonous decrease as the specific energy of the laser increases.
Experimental Study on Fatigue Performance of High Strength Bolts of Rail Vehicles Under Axial Alternating Load
Authors: Tan Fuxing , Xuan Dongsheng , Zheng Zhiwei , Zhang Peng , Shen Hui 
Published: April 2021

AbstractLots of key parts of rail vehicles are connected by screw thread fastening. Therefore, it is very important to evaluate the service performance of bolt correctly and efficiently. Through the evaluation of the service performance of bolts, a series of engineering application problems of bolt connection can be well solved. In this paper, model building, theory checking, simulation analysis and bench test verification are studied in a unified way, so as to get the theory and research method of engineering application. According to the bench fatigue test, the 10.9 grade bolt was fractured after loading about 3 million times, so the bolt could not meet the life cycle requirement under this working condition.
Sol-Gel Method on the Preparation of Boron-doped Activated Alumina
Authors: Wang Shinuo , Liu He , Yuan Shuai , Fu Rong 
Published: April 2021

Abstract
In this paper, the crystal phase, pore structure, and surface properties of boron doping γ-alumina were investigated systematically, by the sol-gel method. The influence of the chemical environment and the modification mechanism of aluminium was explored in boron doping alumina. The samples were characterized by using XRD, N2 adsorption at low temperature, NH3-TPD, TEM, and NMR. The X-ray diffraction peaks of boria-alumina have no obvious change with the increasing content of boron, which still gives priority to the characteristic diffraction peaks of γ-Al2O3. Both the specific surface area of boria-alumina and pore volume diameter increase. The result of NMR indicates that boron alters the chemical environment of aluminium, then causes the difference in physical and chemical properties on the surface.
Clinical Overview of Prescription of Promoting Blood Circulation and removing blood stasis in Treating Diabetic Nephropathy
Authors: Wang Runxi , Tian Chunhong , Liu Yuexuan , Lou Qianye , Yang Mengjie , Si Guorui , Cai Ruijuan , Wang Ru , Cui Yangqing , Fang Yan , Wang Jing Huan , Xing Zhiyu , Zhang Huan , Li Xiaobing 
Published: April 2021

Abstract
Promoting blood circulation and removing blood stasis is an important method of clinical treatment of diabetic nephropathy (DN). Such prescriptions or compound prescriptions have a definite effect after long-term clinical practice. The Prescription of Promoting Blood Circulation and removing blood stasis (PBCRBS) reviewed in this article can improve glucose and lipid metabolism disorders, inhibit the changes in inflammation and promote blood flow of DN, reduce the burden on the kidneys, and delay the pathological changes of DN. This article summarizes the PBCRBS Clinical Overview of prescription in Treating Diabetic Nephropathy.
Preparation and Luminescence Properties of K2MgSiO4:Mn4+ Phosphor
Authors: Chen Dai , Li Zhisen , Wen Yan , Man Shiqing 
Published: April 2021

Abstract
The K2MgSiO4:xMn4+ phosphor was synthesized by high temperature solid-p hase method and its luminescence characteristics were explored. The X-diffraction patt ern measured by the X-ray diffractometer matched well with the international standard card. The synthesized sample is a pure phase crystal, indicating that the doping of Mn 4+ has not changed The crystal structure of K2MgSiO4. Through the excitation and emi ssion spectra measured by the fluorescence spectrometer, it can be seen that the sample has 4 excitation peaks at 368nm, 422nm, 451nm and 534nm, and the maximum emissi on peak of the sample is at 654nm. By changing the doping concentration of Mn4+ ion s, it is found that as the Mn4+ concentration increases, the luminescence intensity of the sample increases, and finally the concentration quenching occurs after the concentrati on exceeds 1%. The chromaticity coordinates of the emission of the sample were meas ured to prove its role in the market. The chromaticity coordinates of the sample are loc ated in the red light zone and are close to the standard red light. The fluorescence lifeti me of Mn4+ transition on the D layer in the sample is about 0.2ms.
Research and Analysis on Adaptive Model Identification of System Parameters Based on Sports Safety Model for Children with Different Physique
Authors: Yang Chunhua , Zhang Wanjun , Gou Xiaoping , Zhang Yunli , Guo Qiurong , Li Bingze 
Published: April 2021

Abstract
There are differences in the safe heart rate of children with different constitut ions when exercising. To study the suitable heart rate of children with different constit utions for reasonable exercise provides scientific and effective guarantee for children. Through the establishment of model system parameter identification for children with different constitutions who exercise and keep fit, the model system parameter adaptive model identification for children with different constitutions who exercise and keep fit and other types of sports crowd parameter identification are further studied. Through t he analysis of parameter adaptive model identification, the safe heart rate of children w ith different constitutions and genders is obviously different during sports. In order to e nsure the safety and effectiveness of their sports, children with weak constitution and o bese children should be treated differently in groups and genders when arranging child ren’s sports fitness and training plans. The simulation results verify the feasibility and e ffectiveness of the parameter adaptive model identification method.
Application of new carbon fiber material in sports equipment
Authors: Wang Feng 
Published: April 2021

Abstract
The application of a large number of carbon fiber composite materials in competitive sports improves the level of competitive sports and promotes the development of sports. Select the carbon fiber composite matrix to optimize the design of sports equipment structure, and obtain the optimal form, thickness and number of layers of reinforcement grid; based on the obtained information and number of layers of reinforcement grid, establish the finite element model of sports equipment reinforced plate, analyze the relationship between the stability of sports equipment reinforced plate and bending stiffness, obtain the optimal structure of stiffness in the design space of sports equipment, and complete the optimization of stiffness.