bluuebunny/crossref_metadata_2025 huggingface dataset:
The Influence of Braking Pressure on the Temperature and Stress Field of Iron-based Friction Pairs
Authors: Ning Keyan , Han Junjiao , Han Ming , Zhang Nan , Du Jianhua , Lang Zhaoyang , Liu Zhe , Liu Guimin , Ji Zhen , Jia Chengchang
Published: October 2020

The material model was established by the finite element analysis software ABAQUS. The temperature field and stress field of iron-based powder metallurgy friction pairs under the brake pressure of 0.44Mpa and 0.8MPa were calculated respectively. The variation laws of temperature and stress under two pressure conditions were compared and analyzed. The results show that with the increase of braking pressure, the stress of the friction pairs increases, but the distribution of temperature and stress fields changes little.
The Effect of Rotation Speed on the Temperature and Stress Field of Iron-based Friction Pairs
Authors: Han Junjiao , Ning Keyan , Han Ming , Zhang Nan , Du Jianhua , Lang Zhaoyang , Liu Zhe , Liu Guimin , Ji Zhen , Jia Chengchang
Published: October 2020

In view of the iron-based powder metallurgy friction pairs under braking conditions, the temperature field and stress field of friction pairs under different rotation speeds were calculated by using the finite element software ABAQUS through building the structure and physical model of friction pairs. The temperature and stress distribution of the friction pairs under different rotation speeds were studied. The results show that in the process of friction braking, the temperature at the middle diameter of the friction contact surface is higher, and the stress at the inner diameter of the friction contact surface is the largest. With the increase of rotation speed, the distribution of temperature and stress is not changed.
Calculating the Mechanical Properties of DX56 Steel by the Spherical Indentation Method
Authors: Sun Mingcheng , Tan Che , Tan Wei , Yang Chao
Published: October 2020

The mechanical properties of metal materials are studied by indentation method in this paper. The elastic-plastic curve of indentation experiment is obtained by fitting the representative stress and strain points, and the theoretical elastic-plastic curve is described by the power index equation of three parameters. After optimal coincidence of two curves, the yield strength, strain hardening index and elastic modulus of the material are obtained. Taking DX56 steel as an example, which has good deep drawing property for automobile, the mechanical properties of the steel are tested by indentation method and compared with the results of uniaxial tensile test. The error of tensile properties is small, so the indentation method can be used to detect the mechanical properties of metal materials.
Experimental Research on Basical Mechanical Properties of Bamboo Plywood
Authors: Tang Gan , Zhang Zhexian , Sun Ping , Jiang Tianli
Published: October 2020

The objective of this study is to investigate the mechanical properties of bamboo plywood. Seeking more sustainable materials to reducing the carbon impact onto our environment has put bamboo on the map as an alternative building material, especially in the regions such as China, Southern Asia, and South America, where the bamboo is abundant. The basical mechanical properties of the bamboo plywood were carefully tested and recorded to provide a first-hand database on the parameters of the compressive strengths and shear strengths of such material.It can provide theoretical reference for the application of bamboo plywood in practical engineering.
Experimental Study on Bending Property of Bamboo-Reinforced Solid Wood Composite Board
Authors: Chen Qiang , Bao Yanmin , Xie Xinghua , Li Xianmin , Yang Ling , Xie Zihong , Shen Bo
Published: October 2020

Bamboo and wood structures are restricted by material characteristics because of its span, bearing capacity and structural size. In order to reveal the relationship between the bearing capacity and the bearing capacity of the bamboo-wood composite structure, this paper proposes a bamboo-reinforced solid wood composite board with bamboo-reinforced board and solid wood as the skeleton, which is spliced with any length of wood bar, and is subjected to mid-span bending test. The failure form, the relationship between load and deflection, and the relationship between load and strain are obtained. The experimental results show that the strain along the middle cross section of the original wood board and the bamboo-reinforced solid wood composite board is still basically in accordance with the assumption of flat section, which indicates that the bamboo and wood can work together, and that the bamboo-reinforced solid wood composite board give full play to its tensile properties.
Research on the Performance of Series Waterborne Polyurethane Acrylate Modified Epoxy Acrylates
Authors: Liu Hongbo , Xue Xiaowu , Xiao Wangdong , Wei Jingjing
Published: October 2020

In this study, a series of bifunctional-based UV curable waterborne polyurethane acrylate modified epoxy acrylate (UV-WPUA) was prepared by using 2,4-toluene diisocyanate (TDI), Epoxy resin (E51) and polyethylene glycol (PEG) as the main materials. Waterborne resin and UV curing film with content of C-O-C were obtained by using polyethylene glycols with different molecular weights. The infrared spectra (FT-IR) demonstrated the presence of C=C and epoxy bond in the UV curing film chains. In addition, the molecular weight of the oligomer, and glass transition temperature, gelation rate and thermogravimetric analysis of the films were investigated.
Coexistence of Digital and Analog Resistive Switching Behaviours in Ag/CuAlO2/TiO2/p++-Si Memristor
Authors: Yi Hai , Ilyas Nasir , Li Chunmei , Li Dongyang , Jiang Xiangdong , Li Wei
Published: October 2020

The digital resistive switching is suitable for the applications of information storage and logical operation, while the analog resistive switching is required in the neuromorphic computing system. This paper reports the stressed bias voltage-dependent digital and analog resistive switching behaviours coexisted in Ag/CuAlO2/TiO2/p++-Si memristor devices. At high biased voltage, the device has demonstrated bipolar resistance switching functions with a resistance ratio over 104 and reliable durability. Moreover, in the low voltage sweeping region, the device showed potentiation and depression characteristics. It is suggested that the bipolar resistive switching may be due to the local migration of Ag and oxygen ions within the dielectric layers. This new memory structure with digital and analog resistive switching is expected to reduce to decrease the manufacturing complexity of the electronic circuit containing digital/analog memristors.
Using Wolfram-Doped Diamond-Like Carbon Film to Extend Lifetime of Spinneret Punching Needle in Production Line
Authors: Sun Yibo , Wang Caiping , Yu Xiang , Tian Zhenfei , Guo Zhenhua , Liu Yuzhong
Published: October 2020

Punched by needle, spinneret is a critical component of chemical fiber production equipment. Increasing order and short lifetime of punching needle seriously drags the production schedule of enterprise. W-DLC (wolfram-doped diamond-like carbon) film was deposited on the needle in a magnetron sputtering system, and the doping content of wolfram was controlled by adjusting the ratio of Ar to C2H2. A systematic investigation was conducted on the structural and punching performances of the coated needle. The results show that, (1) W-DLC film has a dense structure, and W element exists in phase of W1-XC. (2) W-DLC film plays an important role of the needle protection, and can prolong its lifetime in evidence. (3) W-DLC film coated punching needles can punch up to 6000 times per needle, and its lifetime can be increased to about 200% in the production line.
Solvothermal Synthesis and Characterization of Nest-shaped BiOCl
Authors: Yang Hui , Wang Xiaoyu , Wei Jiangang , Mao Yuqin , Zhu Luping
Published: October 2020

BiOCl with nest morphology was preparation successfully. By the condition that the ratio of BiCl3 to urea is 1:2 and with a simple solvothermal route. The morphology and composition of BiOCl were studied by X-ray diffractometer (XRD), scanning electron microscope (SEM), and UV-vis spectrophotometer methods. SEM result indicates that the sample exhibited nest-shaped structures. XRD results showed that the synthesized sample were pbfcl layered structure BiOCl with good crystallinity. UV–vis spectra reveal that the band gap energy of the BiOCl was 3.57 eV.
Preparation and Properties of Pesticide-loaded Carboxymethyl Chitosan Microsphere
Authors: Xu Qing , Wang Daibo , Liu Guohua , Yan Changrui , Yang Jiang , Nie Fei
Published: October 2020

Controlled release system has been widely developed and used in agriculture to improve efficacy and minimize environmental pollution. Here, the pesticide-loaded carboxymethyl chitosan microspheres were constructed by suspension-crosslinking method. Carboxymethyl chitosan was used as a carrier to formulate microsphere to load neonicotinoids with a mixture of calcium chloride and glutaraldehyde as double-component cross-linking agent. The resulting microsphere processed high drug loading and encapsulation efficiency with a mean diameter of 1 mm. The UV detection method of pesticide was established, which was convenient and quick. The pesticides release properties of the microspheres were investigated, and the controlled release time was more than 6 days, which achieves the objective of improving the efficacy of the pesticides. This work would promote the development of controlled-release pesticide systems.
Comparing Study on Metal Rubber and High Polymer Rubber
Authors: Lu Chunhong , Bai Yuwei , Zhang Yuzhi , Tian Guang
Published: October 2020

In this paper, the metal rubber and rubber were systematically compared, on the basis of comprehensive comparison of the manufacturing technique property of the metal rubber and high polymer rubber, the physical and mechanical properties of the two materials, especially the elastic and damping properties, were emphasisly compared. Finally, the scope of application of the two materials was discussed. The results of this study has certain guiding significance for application of metal rubber properly by the researchers engaged in the vibration isolation and damping of engineering.
Safety Analysis of Carbon Fiber Composite Subjected to Different Levels of Bending Moment
Authors: Li Jialong
Published: October 2020

Carbon fiber composite rods can be widely employed in engineering due to their high ratio of the strength and density. Carbon fiber composite rods can be only used in the suitable conditions. In particular, under the bending deformation, the failure of carbon fiber composite rods can lead to the engineering accident if the applying bending moment is beyond a certain value. In this paper, a finite element model (FEM) for carbon fiber composite rod was put forward to simulate the mechanical responses of carbon fiber composite rod subjected to bending moment loading. A series of simulations under different levels of bending moments were conducted. Based on the calculated results, the limit bending moment was obtained by comparing the mechanical responses and the failure strength.
A Control Circuit Design for Automatic Aperture
Authors: Cao Yong , Zheng Yifan , Liu Yi , Wang Xiao , Hu Jinrui
Published: October 2020

In view of the fact that automatic aperture technique is applied as a method of regulating light in the current industrial monitoring and control systems more and more, an automatic aperture control circuit is designed according to automatic aperture control principle. The circuit has the characteristics of the simple structure, low cost and high reliability and etc. It has been proved by experiments that the circuit can adjust the size of aperture automatically according to the change of the external illumination, which ensures proper luminous flux entering the lens, and avoids the loss of image gray levels in bright space, and solves the image flicker caused by the change of light intensity, ensures the CCD get used to brightness changes of scenery outside and obtain the best image.
UK’s Ecological Protection Construction Characteristics and Its Enlightenment on Hainan China
Authors: Zhang Changda , Li Ziyu , Zhang Hua
Published: October 2020

The Central Committee of the Communist Party of China has explicitly proposed the construction of a national ecological civilization experimental area (Hainan), and it is also one of the strategic orientations given by General Secretary Xi Jinping to Hainan’s "three zones and one center". Hainan has now accelerated the pace of ecological protection construction. The article systematically expounds the characteristics of ecological protection construction in the United Kingdom, and analyzes the deficiencies in ecological protection construction in Hainan. Drawing on the experience of ecological protection construction in the United Kingdom, and combining the actual situation in Hainan, four suggestions for improving ecological protection construction in Hainan are put forward: 1) Legislation first, strengthen the top-level design; 2) Scientific zoning, implement diversified management; 3) Promote green and harmonious national park Construction; 4) grasp the key points and do a good job in the design of eco-tourism products. With a view to providing a reference for Hainan’s ecological protection and construction.
Simultaneous Measurement and Simulation of Angular Position and Angular Speed for Time Grating
Authors: Gao Zhonghua , Li Pengxia , Wan Jialuo
Published: October 2020

A method is presented in order to realize the measurement of angular position and angular speed simultaneously based on the theory of time grating and the measurement of angular position and angular speed is transformed into the measurement of phase difference. Four orthogonal excitation signals are generated by the internal phase-locked loop module of FPGA. The excitation signals are superposed and input to the stator sensor. At this time, the rotation of the motor causes the rotation of the rotor sensor to generate the induction signal. The phase difference of the two signals will be obtained by the input comparison circuit of the induction signal and the excitation signal. The phase difference will be processed in FPGA, and finally the angular position and angular speed values will be obtained. The simulation results show that the method is feasible. The experimental results show that the accuracy error of angular position measurement can reach ±3", and the measurement speed stability can reach 3rpm(3%o) when the angular speed is 1000rpm.
Flexible Quantum Dot Light Emitting Diodes based on Copper Nanowires/Poly(P-Phenylene Benzobisoxazole) Composite Electrode
Authors: Yang Min , Zhang Qin , Zhang Wenjing , Ren Fumeng , Feng Jinlei , Gong Dongfei , Hao Zhongqi , Hai Xia , Li Fangfang , Zhang Yubao
Published: October 2020

Flexible quantum dot light emitting diodes have attracted widespread attention due to their many advantages such as low cost, color tunability, and high luminance effciency. Among flexible electrodes, copper nanowires have attracted much attention due to their high electrical conductivity, simple fabrication process, and low cost. However, the oxidation and poor film quality of copper nanowires films are the barrier that restrict their practical application. In this paper, polyethylene terephthalate/copper nanowires/poly(p-phenylene benzobisoxazole) composite flexible electrode can solve the problems of oxidation and high surface roughness of copper nanowires, which improves the performance of flexible quantum dot light emitting diodes.
Design of Programable Control Electric Current Drive Based on ATmega8
Authors: Cao Yong , Zheng Yifan , Liu Yi , Wang Xiao , Hu Jinrui
Published: October 2020

This paper provides the design project of programmable control electric current drive based on programmable control interface used ATmega8 as core to control drive. The electric current drive adopts Buck converter to achieve input/output power conversion. The feedback loop uses voltage and current double feedback adjustment to control PWM drive circuit, so that the output of Buck converter could be adjusted. According to set value, the programmable control interface control current drive outputs the matching value by high frequency PWM output. The performance experiments is done, the results indicate that the output of programmable control electric current drive has much higher reliability and faster responding, satisfied design demand.
The Relationship between Physical and Chemical Characteristics and the Loss of Pisha Sandstones
Authors: Wu Yan , Ren Haiping , Wang Xuan , Shen Zhenzhou , Yang Zhongfang
Published: October 2020

Pisha Sandstones are widely distributed in the wind-water erosion intersection zone of northwestern China. In this region, serious soil and water loss has caused the riverbed of the lower Yellow River to become higher than the adjacent ground. Fifty-two samples of four types of Pisha Sandstones (purple, white, pink and gray) from different depths (0 m, 2 m and 10 m) were examined in laboratory experiments to gain a better understanding of the relationship between erosion and the loss of Pisha Sandstones as well as the mechanisms of erosion. All of the samples were analyzed using chemical methods, X-ray diffraction and scanning electron microscopy. The mineral and chemical compositions of Pisha Sandstones were found to be very different from those of ordinary soil and varies greatly during the whole erosion process (sampling depth). Wind-water erosion also affected the microstructure between the deep and surface Pisha Sandstones, ultimately causing gravitational erosion and the loss of Pisha Sandstones. Although not all of the observations could be explained, it was apparent that wind erosion, water erosion and gravitational erosion had both direct and indirect effects on the loss of Pisha Sandstones.
Manipulation of G1Ba2Cu3O7-x Film Properties by Simply Changing Growth Temperature with RF Sputtering Method
Authors: Xie Zhongzhou , Li Zhonghao , Lu Hao , Xu Jianming , Luo Xiaojing , Zhu Yanyan , Wang Ying
Published: October 2020

We have investigated the relationship between Jc ( the critical current density) and H (applied magnetic field magnitude) for Gd1Ba2Cu3O7-x((Gd)BCO) films grown from 750 °C to 850 °C by RF sputtering. Measurements of JC(H, θ) (the magnetic-field angular dependence of the critical current density) reveal that film B (800 °C) shows enhanced pinning compared with C (850 °C), A (750 °C) (Gd)BCO films. The film C (850 °C) is the most anisotropic. We speculate that a lot of stacking faults exist in film C (850 °C), based on a board peak along ab-plane and no peak along c axis from the Jc angular measurements together with the small anisotropy parameter γ = 3. The speculation is proved by angular dependence measurement of film C (850 °C) after high temperature process in oxygen.
Review on Application of Nanomaterials in Soil Remediation
Authors: Li Min , Luo Li
Published: October 2020

As to the hot research aspect of soil remediation, this review elaborated the progress in the application of nanomaterials in heavy metals and organics-contaminated soil remediation, and discussed the ecological safety of nanomaterials usage as well. The mechanism of nanomaterial-based soil remediation mainly includes adsorption, complexation, transformation, etc. The activities of nanomaterials could be enhanced by modification methods. Iron based nanoparticles such as zero-valent iron (nZVI), iron oxide and iron sulphide showed promising application prospect but also possible toxicity to soil ecosystem. However, biologically synthesized nanomaterials are more effective and safer, which has been demonstrated in many studies. Therefore, bio-nanomaterials which can not only meet the requirements of soil recovery, but also contribute to soil fertility is urgently needed.
Study on Soil Heavy Metal Contamination and Risk Estimation in Sixian
Authors: Su Haimin , He Aixai
Published: October 2020

At present, heavy metal contamination of soils is a extensive attention on account of the develop rapidly of urbanization and industrialization. In this paper, topsoil samples were gathered and the contents of heavy metals for example: Cd, Cr, Cu, Zn, As and Pb were determined in Sixian City. The contamination degree of heavy metals and potential ecological risk were estimated using uniparted factor contamination index, Nemero integrated contamination method, geo-accumulation index, and potential ecological risk method. The results showed: except As, mean concentrations of Pb, Zn, Cu, Cr and Cd were greater than soil background values in Sixian City. The coefficient of variation of Zn, Pb, Cu and As are greater than 30%, suggesting that they were more probably affected by human disturbance in the soil of Sixian City. The Pc values ranged between 1.46 and 26.83, displaying almost whole survey region is varying degrees contamination because of heavy metals. The Igeo
showed that the average values implied the follow contamination order: Pb > Cd > Cu > Zn > As > Cr. The most serious element is Pb. The Ei
values of Cu, Zn, As and Cr were observed in the ranges 5.66 to 21.15, 0.74 to 3.13 and 3.99 to 39.42, 1.54 to 3.57, respectively. The RI values were less than 150 with 85% light potential ecological risk and 15% moderate risk.
Study on Microstructure and Properties of 1000MPa Grade Steel Plate for Hydropower Station
Authors: Feng Lulu , Zhang Dong , Wu Kaiming , Qiao Weiwen
Published: October 2020

The influences of heat treatment on the microstructural and mechanical properties of 1000M hydropower station steel plate were studied. The changes in the microstructure and mechanical properties of the investigated steel at different quenching and tempering temperatures were analyzed. It was found that test steel at lower-temperature quenching was transformed into granular bainites and at high quenching temperatures were transformed into lath bainites. Moreover, With the increasing tempering temperature, the yield strength of the test steel first increased and then gradually decreased after reaching the maximum value at 630 °C, whereas the tensile strength decreased unilaterally until the tempering temperature reached 650 °C. Furthermore, the percentage elongation and the low-temperature(−40 °C) impact toughness increased significantly during tempering. Therefore, the quenching treatment was carried out 930 °C, whereas tempering temperature was selected in the range of 600–630 °C.
Study on Determination Method of Target Fishes for Ecological Flow in the main Stream of Huaihe River
Authors: Zhang Ruqiang , Wang Li , Yang Jin , Xu Guanbin , Yang Wei
Published: October 2020

Reasonable ecological flow based on biological indicator is crucial for river ecosystem health and restoration. Selection of biological indicator, often being the target fishes, is of great importance. Differentiating from the traditional way of choosing the rare or economic fishes as the target fishes, a more objective approach was applied in this study. Firstly, the field investigation was conducted to determine the alternative fishes range. Then, the Analytic Hierarchy Process (AHP) was employed to construct the judgment matrixes, aiming at obtaining the order weight values of the selected fishes and screening for the target fishes. This step made sure that the target fishes were representative for habitat requirement for Huaihe River. Based on fish resources data, 20 alternative fishes were selected, including 12 Cypriniformes, 3 Siluriformes, 4 Perciformes, and 1 Clupeiformes species. The results of the order weight values of the judgmental matrix showed that Parabramis pekinensis might be taken as an target fishes for calculating ecological flow because it could represent hydrological requirement for aquatic biology in the main stream of Huaihe River. This study provided a promising method for target species selection in the rivers where rare and endemic species are unavailable.
Characteristics of Green and Blue Water Flow of Hydrological Landscapes of Upper Heihe in Northwest China
Authors: Zhang Ruqiang , Wang Li
Published: October 2020

Blue water and green water are of great importance for food production and maintenance of ecosystem. Blue/green water flow on landscape scale and its seasonal variation remains unclear. This study attempt to analyze characteristics of green and blue water flow on landscape scale.In this study, FLEX-Topo model was adopted. And upstream of Heihe River Basin (UHB) was selected as the study area, which was divided through topographic information into four landscapes, such as riparian area, grass hillslope, forest hillslope and bare soil/rock. Based on the analysis of the simulation during the period of 1979-2015, characteristics of green and blue water flow of the four landscapes was presented. The results showed that (1) FLEX-Topo proved to be an efficient approach for catchment hydrological process simulation as well as for green and blue water study; (2) Annual green water flow(GWF) of riparian area was 325.19 mm/a while its blue water flow(BWF) was 151.92 mm/a. GWF and BWF of grass hillslope was 270.50 mm/a and 199.91 mm/a, respectively; GWF of forest hillslope was 424.75 mm/a which is much greater than its BWF (42.11mm/a);as for bare soil/rock, GWF (227.96 mm/a) was a litter smaller than BWF (295.32 mm/a). From the results, its can be concluded that:(1)on annual scale, majority of precipitation and water reserve in riparian area, grass hillslope, forest hillslope became green water flow, especially in forest hillslope. More than half of precipitation in bare soil/rock turn to blue water flow; (3) seasonal variation of both green water flow and green water flow of the four hydrological landscapes synchronized with precipitation.
Hydrodynamic Properties of High Activated y-Al2O3 in a Fixed Bed Reactor
Authors: Cao Xuejiao , Zhang Ting’an , Liu Yan , Zhang Yubin , Zhang Weiguang
Published: October 2020

The high activated γ-Al2O3 hydrodynamic properties in the fixed bed are studied in this paper. The factors of gas velocity and the heights of the bed on the axial bed pressure, bed pressure drop and bed voidage are studied. The results indicated that under the same height of fixed bed, the axial pressure decreased along the bed at the same gas velocity. While the pressure drop increased with the gas velocity and the bed height increased. The pressure drop has a good agreement to the Ergun equation. According to the Ergun equation, the bed voidage is regressed at different height of fixed bed. The results revealed that the bed voidage of high-activated γ-Al2O3 is almost the same in the fixed bed heights of 400 mm, 300mm and 200mm, which is 0.31, 0.32, and 0.32 respectively.
Preparation of g-C3N4/BiOBr Composites and Their Enhanced Visible-Light Photocatalytic Performance
Authors: Ren Xianming , Zhan Hao , Shen Yunxiang , Cao Chunhua
Published: October 2020

Novel g-C3N4/BiOBr composites were prepared successfully by a simple liquid-phase precipitation method. The morphologies and microstructures of the photocatalysts were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). With dye Rhodamine B as a model pollutant, the photocatalytic activities of the g-C3N4/BiOBr composites with various mass ratio was explored, and the possible photocatalytic mechanism was investigated briefly. The results showed that g-C3N4/BiOBr composites were formed successfully, and some fine flakes of g-C3N4 embedded in the staggered spaces and surface of BiOBr nanosheets with thickness of 50-80 nm. Compared with pure g-C3N4 and pure BiOBr, g-C3N4/BiOBr composites showed enhanced activities for both adsorption and photocatalytic decoloration of RhB. The optimum mass ratio was found to be 1:4 (g-C3N4: BiOBr) exhibiting the highest photocatalytic activity. The combination between g-C3N4 and BiOBr in composites could increase the surface area, so then improve the adsorption properties, moreover, it could contribute to separation and migration for the charge carriers. The effects of various scavengers on photocatalytic efficiency revealed that h+ played predominant role for the photo-decoloration of RhB on g-C3N4/BiOBr composites.
Optimization of Aseptic Germination System of Seeds in Soybean (Glycine max L.)
Authors: Liu Ying , Li Xiaopeng , Li Xiaohao , Liu Kaizhe , Rao Gangshun , Xue Yingbin
Published: October 2020

The results in the process of the optimization of aseptic germination system of seeds in soybean were found as follows. Using the method of chlorine sterilization to sterilize soybean seeds for 2-4 hours were found to get the best results and found to be suitable for the growth of soybean seeds and obtainment of the best quality explants. Relative to other varieties, the soybean variety of Mao-Dou No. 5 was found to gain the best germination effects, and the localization way of seed inoculation and the light conditions had no significant effects on the germination of seeds of Glycine max.
Substrate-dependent Growth of CH3NH3PbI3 Films Deposited by Vacuum Evaporation
Authors: Lu Ying , Han Qiang , Zhao Yuan , Yang Chenggang , Li Youzhen , Liu Xiaoliang
Published: October 2020

CH3NH3PbI3 (MAPbI3) films were prepared by dual-source vacuum evaporation on Au, poly(3,4-ethylenedioxythiophene) (PEDOT), and indium-tin-oxide(ITO) with the similar deposition parameters. The films were characterized with X-ray diffraction (XRD), steady-state photoluminescence (PL) and Raman spectroscopy. The interface electronic structures of co-evaporated MAPbI3 films on different substrates were studied with ultraviolet photoemission spectroscopy (UPS) and X-ray photoemission spectroscopy (XPS). The research indicates that Au is more suitable for the film growth than the other substrates, especially when the film is very thin. The poor adsorption of the precursors may make it difficult to form MAPbI3 thin film on ITO. Furthermore, it is found that the charge transfer efficiency at the interface between PEDOT and MAPbI3 is relatively high, which indicates that PEDOT can act as an effective hole transport layer for MAPbI3-based devices.
Evaluation Method of Antiscaling Performance of Downhole Tools for ASP Flooding in Daqing Oilfield
Authors: Gao Guanglei , Xu Dekui , Ma Junzhe , Li Haicheng , Zhu Shaogong , Zhou Wanfu , Liu Chongjiang , Song Xingliang , Li Kuilong , Wang Chaoyi , Qiu Yadong , Li Jianyun
Published: October 2020

At present, the technology of ASP flooding in Daqing Oilfield has entered the stage of industrialization and popularization. The total number of injection wells of ASP flooding has reached more than 4000. At present, the main problem of ASP flooding layered injection wells is that after injection of ASP compound solution for a certain period of time, the displacement effect is poor due to the sticking of scale and micelle in the partial hole and throttling element of injector A series of influences, such as the increase of the workload and the shortening of the period of measurement and adjustment, etc. However, the existing anti scaling technology mainly deals with the parts that are easy to scale, which has the advantages of high lubrication, low friction and non viscosity. However, due to the variety and different performance, it is necessary to compare and evaluate the anti scaling performance. However, the conventional coating evaluation method mainly judges the advantages and disadvantages of the coating technology through the conventional inspection indexes such as appearance size, roughness and smoothness There is no practical significance for the evaluation of the anti scaling performance of the special environment of ternary injection. Based on the field test, this paper forms a set of evaluation method for the scale prevention performance of ASP flooding, realizes the evaluation and optimization of the scale prevention performance of ASP flooding, and effectively prolongs the testing and adjusting period
Study on Phosphate Removal from Water Using Adsorbent Synthesized from Spent Zn-Mn Battery
Authors: Xu Ke , Deng Tong , Li Chunguang
Published: October 2020

The adsorbent synthesized from spent Zn-Mn battery was used to purify phosphate from aqueous solution. From the results it could be seen that pH value affected phosphate removal significantly, optimum pH in the purification process was 8.0. The removal rate of phosphate increased when the adsorbent dosage improved. The reaction process was fast and the purification ratio could reach 96.2% for 10 minutes. The adsorption isotherm of phosphate purification fitted Langmuir equation and Freundlich equation. The Q0 value in Langmuir equation was 56.82 mg/g and the n value in Freundlich equation was 3.61. From spent Zn-Mn battery effective adsorbent for phosphate removal could be synthesized.
Study of Diffused Result in CAO Fei-dian Sewage Deep Sea Discharge Engineering
Authors: Yu Hang
Published: October 2020

The wasted water diffuser is an important engineering technology to protect marine environment. It is very important in the protection of water environment in port. The diffusion effect of sewage in the ocean depends on the study of the angle parameter of the diffuser in physical model test, and CAO Fei-dian sewage deep sea engineering was an example in this article. In the engineering, jet angle is 0 degree, and horizontal angle is 0 degree too. This design not only ensures that sewage is adequately diluted, but also that the marine environment is not disturbed. This technology will play an increasingly important role protection of marine environment in the future.
Study on Green Decolorization Technology of Agar in the Extraction Process
Authors: Cai Ying , Wu Zhanxia , Li Sidong , Wang Minting , Guo Wanting , Hu Zhang
Published: October 2020

To establish a green decolorization technology of agar in the extraction process, the effects of activated carbon amount, decolorization time and decolorization temperature on the decolorization of agar solution extracted from Gracilaria rubra were investigated through single-factor tests with the decolorization ratio as an index. On the basis of single-factor tests, the decolorization process was optimized using orthogonal experiments. The results showed that the optimum conditions for decolorization with activated carbon were as follows: amount of activated carbon 0.6 g/100mL, decolorization time 5 min and decolorization temperature 70 °C. When the optimum conditions of decolorization with activated carbon were used on the basis of pre-treatment of diatomite, the decolorization rate of agar solution reached 81.6%, and the agar solution was nearly colourless, clear and transparent. The diatomite-pretreated decolorization of activated carbon overcame the disadvantages that chemicals are needed to acidify and bleach Gracilaria in the traditional agar extraction process. It not only avoided the use of chemicals, but also effectively decreased the water consumption and the amount of produced chemical-containing waste water.
Agricultural Products’ Custom Bundling Pricing Based on Positive Externality
Authors: Wang L , Pan Y , Sun X
Published: October 2020

Agriculture, rural and farmers are world-wide issues, and agricultural products have long been a problem for China’s "agriculture, rural and farmers". Because agricultural products show strong positive externality, the formulation of bundled pricing strategy can not only reflect the characteristics of agricultural products, but also in line with the development trend of Chinese agriculture. This paper studies the pricing of product bundles under positive externality- with agricultural products as the object, combined with the pricing of agricultural products, and discusses the situation of custom bundled pricing of agricultural products under positive externality, and provides reference to the custom bundled pricing strategies of agricultural products for rural areas, agriculture and farmers in China.
A Stochastic Programming Method for Resources Allocation in Education of Higher Vocational College
Authors: Kong Xiangming , Wang Donglin , Wang Yu , Wang Nan
Published: October 2020

A stochastic education resources management (SERM) model has been proposed to solve resource-allocation problems in education under uncertainty. The advantages of SERM are as follows: (1) it is capable for dealing with uncertainty which may exhibit random feature in the right-side of constraints; (2) the optimal education resource-allocation strategies for each higher vocational college under different constraint levels can be generated. The application in education resources sharing systems indicates that the optimal resource-allocation strategies generated by the SERM model can increase the total output of education value, which includes the personnel, technological and social outputs.
Effect of Aluminium Fluoride on the Structure and Properties of Cryolite Alumina Molten Salt System
Authors: Tian Guocai , Wang Yongzhi
Published: October 2020

The influence of aluminium fluoride AlF3 on the structure and properties of cryolite-Al2O3 melts are studied by molecular dynamics simulations at 1283 K and 0.1 MPa. The structure property such as radial distribution functions and coordination numbers, and the physical-chemical property such as density, conductivities, diffusion coefficients, and viscosities of the systems are obtained. It is shown that with the increase of aluminium fluoride content, fluorine ions in (Na3AlF6+4%Al2O3)1-w
(AlF3)
w
molten salt system will replace the position of oxygen in alumina to form aluminium oxy-fluoride ion group, while aluminium ion group will form larger aluminium composite ion group through the connection of oxygen bridge and fluorine bridge. The formation of these ionic groups results in the decrease of the diffusion coefficient of anion and anion, the increase of viscosity and the decrease of conductivity in (Na3AlF6+4%Al2O3)1-w
(AlF3)
w
, molten salt system.
Effects of the Applied Magnetic Field on the Quality of Resistance Spot Welding in Rail Vehicles Using Stainless-Steel
Authors: Xu Ye , Li Gangqing , Ye Jiehe , Han Xiaohui , Jin Cheng
Published: October 2020

The ring magnet nested on the surface of a spot welding electrode is used as the external magnetic field source. We analyzed the effects of an applied magnetic field on the appearance quality of joints, the nugget diameter of resistance spot welding for rail vehicles using stainless steel through comparative resistance spot welding experiments. A coupled electrical-magnetic finite element model was established to analyze the effect of magnetic forces on the welding current direction. Result show that the appearance of a magnetically assisted spot welding joint was significantly better than that obtained by conventional spot welding. The nugget diameter of the welding spot was also significantly increased. The Lorentz force introduced by applied magnetic field deflects the path of electrons in welding electoral field, which makes nuggets with a larger radius and a lower depth.
Effects of Different Factors on Seed Germination and Seedling Growth in Echinacea purpure
Authors: Liu Ying , Liu Hongjie , Li Xiaohao , Lin Shiwan , Liu Kaizhe , Xue Yingbin , Chen Miao
Published: October 2020

In this experiment, seeds of Echinacea purpure were used as materials to investigate the effects of several factors on the germination and seedling growth. The results showed that 6-BA, SNP and NAA all promoted the germination and seedling growth of E. purpure seeds. The best effects were obtained, when application of soaking treatment for seeds with 5 mg/L NAA before inoculating them onto MS media supplied with 0.1 mg/L IAA, the highest seed germination rate was 86.7%, and the best rooting rate of seedlings was 83.3%. However, seed sprouting and development of seedling were inhibited, when Mn2+ was added into mediums.
Preparation and Chemical Analysis of Volatile Oil in Two Different leaf type of Ficus hirta Vahl.
Authors: Chen Lishi , Chen Jianping , Du Mengjiao , Tang Wenjing , Zhang Biting , Yu Chuqin
Published: October 2020

To analyze the chemical constituents of volatile oil in two different leaf types of Ficus hirta Vahl. Steam distillation was used to collect the different leaf types of Ficus hirta Vahl., the volatile chemical components of extracts were analyzed using GC-MS,and the relative contents of various chemical components in the volatile oils of the two medicinal materials were calculated by area normalization method. The volatile oils of the Ficus hirta Vahl of three-lobed leaf type and five-lobed leaf type contained 38 and 39 compounds, respectively. The main components are coumarins, organic acids, aldehydes, esters, alcohols, etc. In addition, there are some Hydrocarbons, phenols, ketones, and the chemical composition and relative content of volatile oils of the two have large differences.The method can quickly and easily identify the chemical constituents of the volatile oils of two different leaf Ficus hirta Vahl., and there are significant differences in the chemical constituents in the volatile oils of the Ficus hirta Vahl. of three-lobed leaf type and five-lobed leaf type.
Nanofiber Mask Fabrication by Electrospun and Its Application
Authors: Su Wen-Ta , Hsu Ming-Shiuan
Published: October 2020

Electrospinning technology is a novel nano-process technology in recent years. It can directly and quickly spray polymer into nano scale fibers, improve the specific surface area, porosity and microporous structure of materials, and extend materials to different applications. Blend PVA/gelatin/magnesium ascorbyl phosphate/tranexamic acid solution, and spin the fibrous mask of 600~800 nm by electrospun spinning machine. Analyze the composition of the fibrous mask, mechanical strength, swelling ratio and nutrients release rate. Finally, evaluate the effect of nanofiber mask by human body test. This study provided a quality nanofiber mask that will be commercially available in the future.
Study of Highly Cited Papers on Antineoplastic Drugs
Authors: Qu Qinghui , Zhang Xinyang , Huang Chongya , Fang Yu , Yuan Baohua
Published: October 2020

The objective of this paper is to study the highly cited papers (papers cited more than 30 times) on antineoplastic drugs, and to provide reference for quality improvement and influence increase of journals. Bibliometric analysis of cited papers on antineoplastic drugs published between 1999 and 2018 is conducted by using the Chinese Citation Database. The results show that 4683 papers are cited 34463 times, with an average of 7.36 times per paper. The papers published in 2005, 2010 and 2009 are the most highly cited papers with 2507 (7.27%), 2424 (7.03%) and 2419 (7.02%) times, respectively. The highest number of citation is owned by the paper authored by Ding Jian which is cited 349 (1.01%) times. The most cited journal is Chinese Journal of New Drugs, which is cited 1287 (3.73%) times. The author’s affiliation with the highest citation is China Pharmaceutical University with a citation of 1252 (3.63%) times. The research fund with the highest citation which funded those studies is National Natural Science Foundation of China with a citation of 4278 (12.41%) times. The most highly cited subject is pharmacy with a citation of 12036 (34.92%) times. The main citation period of the top 20 papers is from the 2nd year to the 9th year after publication, accounting for 67.70%. The peak years of citation are the 4th year and the 5th year after publication. Among the above-mentioned top 20 papers, the first authors of 9 papers are from universities, accounting for 45.00%. There are 210 papers with a citation over 30 times for each paper, including 112 (53.33%) research papers and 98 (46.67%) review papers. The study also shows that the subjects of research papers with high citation include pharmacological experimental research, the evaluation of clinical effects, and the impact and protection of antineoplastic drugs, the number of cited papers of which are 50, 18 and 13, accounting for 23.81%, 8.57% and 6.19%, respectively. The papers with high citation frequency are those about antineoplastic drugs in pharmacological effects and mechanisms, clinical evaluation, occupational protection, adverse reactions, as well as various reviews. Editors of journal should focus to organize and absorb above ideas in selecting manuscripts to fully exploit the excellent manuscript sources, and to improve the quality and influence of journals.
The Effect of TiAl6V4 Particles on Tissue in Rats
Authors: Luan Huiqin , Liu Hong , Bi Jingfang , Chu Zhaowei , Mo Zhongjun , Guo Huan , Wang Fang , Fan Yubo
Published: October 2020

Electron beam melting (EBM) is three-dimensional (3D) printing technologies that can manufacture multi-functional porous scaffolds with exact structures for the application of surgical operations. In the past decade, thousands of acetabular implants manufactured by EBM or SLM have been designed into acetabular cups with certain porosity for surgical operations. Particles of 3D printed porous Ti6Al4V implants will adhere between sintered interface and non-sintered interface of porous sample during 3D printing. However, the internal excess particles of complex structural parts are difficult to remove. During long-term cyclic loading, stress strain can cause residual Ti6Al4V particles to fall off. These detached Ti6Al4V particles are scattered around the implant and are contact with osteoblasts. In our study, we detected the influence of the differentiation concentration of Ti6Al4V particles on bone of rats. The influence of the differentiation concentration of Ti6Al4V particles on bone was evaluated by distal femoral defects in rats. Micro-CT and biochemical analysis were used to evaluate all of the rats after 12 weeks. Outcomes demonstrated that low concentration Ti6Al4V particles may improve the osteogenesis of SD rat through micro-CT. Serum markers implied that the differentiation concentration of Ti6Al4V particles didn’t influence on hepatic and renal functions. In conclusion, Low-dose residual particle does not induce a decrease in bone mineral density (BMD) of rats.
Fabrication and Characterization of a Novel Berberine-oleanolic Acid Delivery Collagen I scaffold
Authors: Chen Zongming , Li Yongsheng , Dai Yao , Zhou Zheng , Hu Yibing , Liu Hairong
Published: October 2020

Postoperative bacterial infection greatly threatens prognosis of patients following tissue engineering implantation and surgical operation. In this study, a novel antibacterial tissue engineering porous scaffold has been prepared, by blending a newly synthesized berberine-oleanolic acid (HL-9) with collagen (COL I) via freeze-drying. It showed that the HL-9 delivery COL I scaffolds displayed a uniform porous three-dimensional structure, high porosity and good water absorption. These HL-9 delivery COL I porous scaffolds (HL-9/COL I scaffolds) are able to release HL-9 steadily for 15 days. HL-9/COL I scaffolds, which contains, 4% and 5% HL-9 respectively, exhibited a similar antibacterial activity against Gram-positive and Gram-negative bacteria. Hence, the HL-9/COL I scaffolds containing 3% HL-9 is used to test the biocompatibility. By employing Alamar Blue assays and FDA staining, the proliferation of MG-63 cultured with 3%HL-9/COL I scaffolds is similar with that cultured with COL I scaffolds. In conclusion, the 3%HL-9/COL I scaffolds showed a good biocompatibility and antibacterial activity, suggesting that it may be applied in tissue engineering in the future.