bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Preparation and Photocatalytic Activity of V-Doping Mixed Crystalline Phase TiO2 Powders
Authors: Peng Fuchang , Lai Qi , Zhong Junbo
Published: March 2020

The vanadium-doping TiO2 photocatalysts powders with different vanadium contents were prepared by a facile sol-gel method. The TiO2 powders were characterized by PL, XRD, UV-Vis-DRS and Laser particle size analyzer. The photocatalytic performance was valuated by photo-degradation of methyl blue. The degradation effect of MB was investigated on the influence of heat treatment temperature and vanadium doping amount. The results show that V-doping can promote the TiO2 particles phase transformation from anatase to rutile and restrain the particles size growth. The V-TiO2 sample is a mixture of rutile phase and anatase phase with good crystallinity. The sample of V-TiO2 particle size distribution is relatively uniform and narrow. The absorption spectrum of TiO2 after doping has obvious red shift compared with that before doping. V-doping can inhibit the recombination of photogenerated e−/h+ pairs. The photocatalytic activity of V-TiO2 with n(V): n(Ti) =1: 100 and calcined at 450 °C is the best, it is 57% in 100 minutes under the irradiation of fluorescent lamp. It is obviously higher than the activity of undoped TiO2 powders.
Structure and Dyeing Properties of Cotton Fabric Modified by Protein from Waste Feathers
Authors: Zhang Li , Li Hong , Zhu Jionglin , Yan Jun
Published: March 2020

The waste feather protein was extracted as modifier to modify cotton fabric. The modified process was selected: the mass fraction of the protein modifier was 4% (weight to the fabric), the mass fraction of the cross-linking reagent was 2%, the processing temperature was 70 °C, and the processing time was 60 min. The structure of the cotton fabric modified was analyzed by infrared spectrometer, scanning electron microscope, XRD and thermogravimetric analysis. The dyeing mechanism and properties of natural naphthoquinone dyes on the cotton fabric modified were analyzed. The results showed that the feather protein grafted onto the cotton fabric by the cross-linking agent. The cross-linking reactions occurred mainly in the amorphous area of the fabric. Furthermore, the dyeing properties of natural naphthoquinone dyes were significantly improved by protein cross-linking agent. The K/S value increased from 1.27 to 7.05 and the color fastness to dry and wet rubbing improved by about one grade.
A Method of Electroless Silver Plating on the Surface of PA6 Fiber
Authors: Chen Ming
Published: March 2020

A layer of silver was deposited on the surface of PA6 fiber fabric by electroless plating method to prepare silver/PA6 conductive fabric. The surface morphology and structure of the coating were analyzed by SEM and EDS. Electroless plating process conditions: 11 g/L silver nitrate, ammonia and sodium hydroxide appropriate preparation into 1.1% silver ammonia solution. Ingredients of reducing agent: glucose 10 g/L, tartaric acid 2 g/L, ethanol 100 ml/L, pH 11-13 was adjusted by adding 10 g/L sodium hydroxide solution, temperature 20-30 °C, reaction time 3min.The resistance of the preparation of silver/PA6 fabric is less than 1 Ω/cm, elemental silver content is 100%, the conductivity is excellent, and the electromagnetic radiation resistance is excellent.
Synthesis and Characterization of Cationic Waterborne Epoxy Acrylic Resin
Authors: Liu Hongbo , Xue Xiaowu , Zhang Wuying , Lin Feng
Published: March 2020

In this work, a cationic waterborne epoxy acrylic resin (WCEA) was synthesized from bisphenol an epoxy resin, acrylic acid, acrylic acid, hydroquinone as an inhibitor, and N, N-dimethylbenzylamine (DMBA) as a catalyst. The changes of NCO groups and acid value during the synthesis process were measured by chemical titration method, and its Fourier Transform Infrared (FTIR) spectra were investigated. The results indicate that the acidified waterborne resin has great water solubility and storage stability after grafting the half-blocked isocyanate.
Formation of Multiple Networks in Cis-1, 4-Polybutadiene: Dynamical Viscoelasticity, Gel Content and Cross-Link Density
Authors: Zhai Junxue , Li Xiang , Zhai Jinting , Zhang Ping , Zhao Shugao
Published: March 2020

The formation of multiple networks of cis-1, 4-polybutadiene rubber (BR) with sulfur and carbon black (CB) were discussed by analysing the curing curve, gel content, cross-linking density (XLD) and dynamic viscoelasticity. XLD and gel test show the network from chains entanglement and sulfur cross-link existing in unfilled BR, in addition there is another network from CB in filled BR. Networks from sulfur and CB cross-links has two different peaks of loss modulus (G”) and loss tangent at different dynamic strain. Furthermore, the average bonding number of each chain to form the network is calculated from the sulfur cross-link density. There is two percolation of G‘0.01Hz or gel content as the average bonding number increased in curing.
Study on Microstructure and Corrosion Resistance of AlCoCrFeNiTi(x) High-Entropy Alloys
Authors: Huang L , Wang X J , Huang B X , Wang C Z
Published: March 2020

AlCoCrFeNiTi(x) (x=0, 0.4, 0.8, 1.0) high entropy alloys (HEAs) were prepared by vacuum arc melting furnace. The results showed that AlCoCrFeNiTi(x) HEAs transformed from a single body-centered cubic structure (BCC) to two kinds of body-centered cubic structures accompanied by a small amount of Laves phase with the increase of Ti content, and the morphology of alloy structure changed from dendrites to the petal-like equi-axed crystals. In addition, the alloy with the content of 0.4 mol. % Ti has a corrosion potential of -0.335V and a minimum corrosion current density of 7.36×10−7 A/cm2, which indicated that the HEAs with the content of 0.4 mol.% Ti has the best corrosion resistance.
Study on Atom Packing and Electrical Properties of Tin (n=2-10) Clusters with GA&DFTB Calculations
Authors: Yu N , Geng Y , Zhang L
Published: March 2020

The researches of atom packing and electronic properties of titanium clusters are of great significance in producing highly pure Ti particles. The geometrical structures as well as electronic properties of Tin(n=2-10) clusters were obtained by using density functional tight binding (DFTB) simulations being combined with genetic algorithms (GA). The binding energy, the second differences in energy, HOMO-LUMO gap, and Mulliken populations were calculated and discussed. The results show that these Ti clusters containing three or less atoms have planar structures or a linear form, while those containing more than four atoms present three-dimensional geometries. There exist different packing structures including tetrahedron, octahedron, and decahedron. As the atom number increases in these clusters, the configures are formed by capping the atoms on the (111) facets of these clusters with octahedron and decahedron geometries. The binding for the electrons is stronger in the icosahedral cluster than that in those clusters having the other configurations. Mulliken populations present significant differences as the atom packing changes in these clusters.
Semi-Analytical Correlation for Pool Boiling Heat Transfer Using Nanofluids Based on Fractal Theory
Authors: Li Yuexiwei , Long Xiaobo , Fan Xingxiang , Liu Zhennan , Liu Cong , Zhang Songyuan
Published: March 2020

On the basis of fractal dispersion of active nucleation sites on boiling surface, a revised fractal model for nucleate pool boiling of nanofluids was established incorporating microlayer evaporation, nature convection and transient conduction. It has fewer empirical constants than that of traditional ones. Results of model using pure fluids and nanofluids conform to data from previous investigations. Thus, accuracy of model is verified. Effects of liquid properties and contact angle on pool boiling heat transfer coefficient (HTC) using nanofluids are discussed according to the present model. It is found that the HTC of nanofluid and the fractal dimension of nucleation sites decrease with the decreasing contact angle. The effect of liquid properties enhancement due to the presence of nanoparticles, has ignorable influence on HTC of dilute nanofluids while the decreased contact angle plays a more important role. It is also found that the surface with lower contact angle had a higher natural convection component.
Experimental and Constitutive Model Study on Dynamic Mechanical Behavior of H96 Brass Alloy
Authors: Zhou Ping , Luo Xiangyan , Liu Baojun
Published: March 2020

To study the mechanical response of H96 brass, the quasi-static and dynamic compression experiments were performed by the universal-testing machine and the split Hopkinson pressure bar system. The selected temperature range was 293 K ∼ 873 K, the selected strain-rate range was 0.001/s ∼ 6000/s and the strains were up to 0.6. It was shown that, this alloy has remarkable strain hardening character, and this alloy is sensitive to strain-rate and temperature. In addition, the Dynamic Strain Aging phenomenon of this alloy occurs under the condition of 473 K and 0.001/s. According to the testing results and the thermal-activation dislocation mechanism, a plastic flow constitutive model was brought forth. This constitutive model can predict and describe the plastic flow behavior of H96 brass alloy in a wide range of temperature and strain rate.
Laboratory Experimental Research on Foamed Warm Mix Asphalt Mixture Road Property
Authors: Gao Kaikai , Chen Fang , Kuai Haidong , Yang Zhengxun , Si Yi , Huo Zhiqiang
Published: March 2020

To verify the foamed warm mix asphalt mixture road property, the article formed foaming warm mix asphalt mixture, Sasobi-LM warm mix asphalt mixture, ordinary hot mix asphalt mixture test piece, comparative analysis of different asphalt mixture The resistance of high temperature to rutting, shear resistance, resistance of low temperature crack, water stability and fatigue properties, and comparative economic analysis. The results show that the resistance of low temperature crack, water stability and shear resistance of foamed warm asphalt mixture surpass Sasobi-LM warm asphalt mixture, but slightly lower than ordinary asphalt mixture; The resistance of high temperature rutting and fatigue resistance of the mixture is lower than that of Sasobi-LM warm mix asphalt mixture; through economic analysis, the economical efficiency of foamed warm mix asphalt mixture surpasses the economical efficiency of the Sasobi-LM warm mix asphalt mixture, lower than the ordinary hot mix asphalt mixture, it is recommended to choose construction in special areas.
Crack Control Technologies of Mass Concrete
Authors: Du Chunhao , You Qiang , Gu Xin , Peng Yiliang
Published: March 2020

With the rapid development of national economy, a variety of large-scale complex projects continue to emerge, resulting in the pouring of mass concrete has become an important part of the construction process. Due to various stress factors, cracks are easy to occur in mass concrete construction, which will not only affect the aesthetic performance of construction projects, but also their quality. Therefore, it is necessary to strengthen and control the construction of mass concrete for construction projects. This paper introduces crack prevention technology of mass concrete, including construction technology analysis, cause analysis and control measures. Through the literature review, the research status of related fields can be understood, thus providing theoretical basis for the future relevant projects.
Experimental Study and Finite Element Analysis of Externally Prestressed RPC Box-Girder with Corrugated Steel Webs
Authors: Ao Deng , Xu Qiang
Published: March 2020

Prestressed normal concrete (PC) box-girder with corrugated steel webs has been widely used in bridge engineering because of its favourable properties and wins general recognition of bridge practitioners, but researches on externally prestressed reactive powder concrete (RPC) box-girder with corrugated steel webs are still rare. In this paper, the experiment and ABAQUS finite element analysis considering materials nonlinearity are performed to study the mechanical properties of externally prestressed RPC box-girder with corrugated steel webs during its whole bending process. The experimental results show that compared with externally prestressed normal concrete (PC) box-girder with corrugated steel webs, the externally prestressed RPC box-girder with corrugated steel webs has higher ultimate bearing capacity, higher cracking strength, better anti-cracking performance and durability. The ABQUS finite element analysis results have good agreement with the test results and the model of this article for the analysis of the whole bending process of externally prestressed RPC box-girder with corrugated steel webs is feasible.
Laser Surface Remelting of AISI 4140 Steel
Authors: Zhao Lirun , Hu Zengrong , Wang Xiaonan , Chen Xiaming , Huan Pengcheng , Zhang Hai
Published: March 2020

In order to improve the surface wear resistance and hardness, laser remelting was used to process AISI 4140 steel. The microstructure and the Vickers hardness of surface and cross-section of those samples were studied. The results shown the laser power was one of the most important facts, which affect the enhanced hardness and microstructure. After laser remelting, the the grain size of the sample surface was refined, and the hardness of the melted surface of AISI 4140 was improved. Compared to the base material it has about 313% incensement for samples processed with 130 W. It enhances the comprehensive mechanical properties dramatically.
Biocompatible Swelling Textile Structure Reinforced Hydrogels with High Toughness and Stiffness
Authors: Wang Ling , Wang Jilong , Shen Hua
Published: March 2020

In the present work, a toughness hydrogel was manufactured by introducing kapok/PET assembly into single network of polyacrylamide hydrogels. The textile reinforced hydrogels (TRH) exhibits apparently higher young modulus than PAAM hydrogel. The normal strength of TRH was six-times higher than that of PAAM hydrogel when it was compressed at 40%. In addition, the swelling ability of TRH in x-y planar direction was largely suppressed, with only a 6.25% increase in the edge length. It was significantly lower than the swelling ability of PAAM hydrogel, which was high to 62.5%. While in the z direction, the swelling ability of TRH was much improved if compared with that of PAAM hydrogel, indicating the anisotropy in swelling properties of TRH. Besides, although the solution absorption ability of TRH was clearly decreased because of the suppress of kapok/PET assembly, the TRH and PAAM hydrogel depicted approximately the same swelling behaviour in the initial 8 hours of absorption from totally dry state.
The Doping of Mineral Additions SF, FA and SL on Sulfate Corrosion Resistance of the HIPC Cements
Authors: Chen Ping , Tian Yu , Hu Cheng , Zhang Xiaoping
Published: March 2020

To prepare highly durable cement concrete for marine infrastructure, the effect of silicon powder (SF), fly ash (FA) and mineral powder (SL) on sulfate corrosion resistance of the high iron and low calcium portland cement (HIPC) were studied. In this paper, a series of experiments were carried out using HIPC cements as the raw material and 20 °C, 5% Na2SO4 solution as the conservation environment. The effect on the sulfate resistance of the system is determined by analysing the mechanical properties of the sample and measuring the corrosion resistance coefficient K to characterize the system’s resistance to corrosion. The results show that the anti-erosion coefficient of HIPC systems with different mineral admixtures has been enhanced to varying degrees, among which the optimal amount of SF is 3%; the optimal amount of SL is 40%; the optimal amount of FA 20%.
Study on Preparation and Properties of Polyurethane-Based AlN Potting Compounds
Authors: Li Nianhua , Liu Jiping , Liu Xiaobo , Yang Weiwei , Song Kunpeng , Li Xueli
Published: March 2020

Polyurethane (PU) is a widely used polymer material. Adhesives prepared with polyurethane as the base material can bond a variety of materials and have excellent performance. In the electronic packaging industry, the potting compounds prepared by using polyurethane as the base material and aluminum nitride powder as the thermally conductive filler has excellent thermal conductivity, which adapt to the increasingly miniaturization and high integration requirements of integrated circuits, and can dissipate the heat generated by components in time, which can keep the device in the best state during using and keep its efficiency and stability. With the continuous development of the microelectronics industry, the advantages of potting compounds with excellent thermal conductivity in the market will become more and more obvious.
Electroplating Wastewater Treatment Method and Development Trend Analysis
Authors: Lu Bing-Jie , Wu Ke
Published: March 2020

Electroplating wastewater is a highly hazardous industrial wastewater with complex composition. For the treatment of electroplating wastewater, the traditional treatment methods include chemical treatment and membrane treatment. According to the requirements of electroplating wastewater treatment and industrial wastewater treatment in recent years, traditional electroplating wastewater treatment technology is difficult to reach new emission standards. The “zero emission” technology of electroplating wastewater has gradually become a new goal of ecological civilization construction. This article starts discussion from this aspect.
Electromagnetically Induced Transparency in All-Dielectric Metamaterial of Bi-layer Asymmetric Bars
Authors: Wang Ziyu , Bai Lei , Shao Jian , Tang Lili , Zhou Xuetong
Published: March 2020

The authors demonstrate the all-dielectric-metamaterials-based electromagnetically induced transparency with low loss and high quality (Q) factor. The all-dielectric metamaterial is made up of bi-layer silicon bars. A transparency window is observed by the coupled the bright and dark modes when the asymmetry is introduced. Compared with metallic metamaterials, it avoids of the loss of ohmic damping, so that the Q factor and the window transmittance can reach 1864 and 96%, respectively.
Precipitation Process Optimization Research on Zinc-Based Electrode Materials Synthesis
Authors: Wang Jianhai , Yang Yubin , Yu Yue , Zhu Shaomin , Xu Bing
Published: March 2020

Optimization of electrode material is one of the most important measures to improve the performance of supercapacitors. Layered double hydroxide electrode materials supported by foam Ni were synthesized by in situ hydrothermal synthesis with CO(NH2)2/NaOH/Na2CO3as precipitants and inorganic Zn(II) and Al(III) as precursors. The catalytic layer is composed of Zn6Al2(OH)16CO3·4H2O and Zn4(OH)6CO3·H2O. Specific capacitance of the electrode materials can reach as high as 1259 F g−1at 1.0 A g−1. Urea in precipitants optimized the composition, structure, and properties of the electrode materials. These encouraging results make these low-cost and eco-friendly materials promising for supercapacitor applications.
Experimental Research of Mechanical Behaviour of GFRP Cross Arm of 500kV Transmission Tower
Authors: Wu Kunpeng , You Qiang , Gu Xin , Peng Yiliang
Published: March 2020

Glass fibre reinforced polymer (GFRP) material is used in the field of transmission tower structure because of its excellent electrical and structural performance. In this paper, a full scale GFRP composite cross arm of 500kV transmission tower is designed and a triaxial load-unload experiment is conducted to study the mechanical properties of it. Three kinds of the most unfavourable load cases of GFRP cross arm are loaded, and the strain changes of the upper, middle and lower parts of the cross arm are obtained. It is verified that the bearing capacity of GFRP cross arm meet the design requirements and GFRP cross arm can be used safely in the transmission tower engineering.
Study on the Wear of the UB Hanging Plate of the Ground Wire Suspension String Clamp in the Continuous Stable Wind Area
Authors: You Yi , He Cheng , Zhang Ling , Jiang Shihao , Fang Sheng , Wei Yanding
Published: March 2020

This study focuses on the common wear phenomena on the side of the UB hanging plate of the suspension string clamp in the continuous stable wind area. The force models of the suspension string considering the wind load in three wind speed stages are established, and the formulas for calculating the gravity load and the wind load of the wire are developed, and the expression of the relationship between the contact point pressure (the contact point between the connecting angle steel and the deflected UB hanging plate) and the wind speed and the icing thickness is derived. The results show that the installation clearance between the connecting angle steel and the UB hanging plate is the main structural factor for the wear phenomena, and the side of the UB hanging plate will contact and wear with the connecting angle steel when the wind speed is greater than the critical wind speed. The contact force between the UB hanging plate and the connecting angle steel increases with the increase of the icing thickness, the span and the wind speed, and the influence of the icing thickness on this contact force is more obvious in the case of the occasion with large span and strong wind. This study evaluates the three factors of span, icing thickness and wind speed, which is of guiding significance for the structural optimization of the suspension string in the future.
Experimental Investigation of Interactions between Double Oblique Cracks on Crack Growth Behaviours under the Fatigue Loading
Authors: Han Zhichao , Qian Caifu , Li Huifang
Published: March 2020

In this paper, the interaction of double oblique cracks is researched experimentally and numerally. Fatigue crack growth tests of both the single crack and double crack specimens are conducted to investigate the effect of crack interactions on fatigue crack growth behaviours. Results indicate that the oblique crack has a shielding effect on the crack growth length of the dominant crack. In addition, numerical simulations show that the stress intensity factors at the dominant crack tips in the double crack specimens are smaller than those at the crack tips in the single crack specimens, which explains why the growth length of the dominant crack decreases in the present of the oblique crack.
Buckling Analyses of Functionally Graded Graphene Nanoplatelets Reinforced Nonlocal Piezoelectric Microplate
Authors: Lu H M , Zhang W , Mao J J
Published: March 2020

This paper analyses the buckling characters of a multi-layered functionally graded graphene nanoplatelets reinforced nonlocal piezoelectric (FG-GRNP) microplate. The FGGRNP microplate is acted by the in-plane axial force and external potential. Graphene nanoplatelets are assumed to dispersing parallel in each layer of the FG-GRNP microplate, but it is distributed graded along the thickness direction. The rule of mixture and Halpin-Tsai parallel model are used to calculate the properties of the FG-GRNP microplate. The governing equations of buckling behaviors the FG-GRNP microplate are derived by nonlocal elastic theory, minimum potential energy principle and first-order shear deformation plate theory. The differential quadrature (DQ) method is adopted to solve the eigenvalue equations. The effects of the axial forces, piezoelectric multiple, nonlocal parameter, external voltage, characteristics of graphene nanoplatelets on the critical buckling load of the FG-GRNP microplate are studied.
Development of Rehabilitation Training Gloves Based on Flexible Robot Technology
Authors: Guo Kai , Zhao Shasha , Liu Bin , Liu Yongfeng , Yang Hongbo , Li Zhenlan
Published: March 2020

This paper develops an intelligent sports rehabilitation glove based on flexible robot technology. Designed for sports rehabilitation gloves through the rational design of flexible pressure sensing systems, micro-precision drives, intelligent control systems, and ergonomic gloves. Through the use of flexible lasso transmission, rehabilitation training is performed on the patient’s hand, and the endurance and endurance of the wearer’s daily life are enhanced. This paper combines the latest flexible sensing technology, intelligent control technology, and micro-precision driving technology with the advanced concepts and methods of sports medicine. Through the combination of medical and industrial research, it has developed low cost, comfortable wearing, convenient and practical, and can meet families, hospitals, and Wearable smart rehabilitation gloves for use in industries such as industry.
Design and Application of γ-aminobutyric Acid Nano-Fluorescent Probe
Authors: Hu Qiao , Pang Yutong , Shi Yuxin , Yang Ke , Liao Xiaoling , Liu Xue
Published: March 2020

The design and development of nano-fluorescent probes is a research hotspot in the field of biological functional materials. The construction of γ-aminobutyric acid (GABA) fluorescent probe based on fluorescence resonance energy transfer (FRET) technology will become a new tool for bacterial screening. Recombinant plasmids suitable for prokaryotic expression were constructed by subcloning technology, and verified by agarose gel electrophoresis and sequencing. The target protein was expressed in BL21 E. coli and purified by nickel matrix affinity chromatography. Spectroscopy and fluorescence imaging validate probe function and evaluate bacteria’s environmental adaptability. The results showed that a recombinant plasmid suitable for efficient and stable expression of prokaryotes was successfully constructed. The release of GABA will cause changes in fluorescence intensity. The probe can evaluate the metabolic activity and adaptability of bacteria to different environments. This method uses bacteria’s metabolic activity to realize the selection of bacteria. The sample does not require special biochemical treatment. Compared with traditional evaluation methods by counting the number of bacteria and analyzing metabolite, it is a more convenient tool for screening and evaluation of bacteria strains.
Preparation and Characterization of Conductive Chitosan/Polypyrrole Composites for Neural Repair
Authors: Shi Yuxin , Hu Qiao , Wang Song , Zhu Xu , Gong Chen , Liao Xiaoling , Liu Xue
Published: March 2020

Electrical stimulation showed ability to promote the proliferation and differentiation of neurons. Thus, conducting polymers such as chitosan/polypyrrole (CS/PPY) composites can be a potential material for neural repair. To improve the preparation processes and biological activity of CS/PPY composites, a novel “one step” method was proposed in the present study. Polypyrrole (PPY) nanoparticles were synthesized in chitosan (CS) solution directly. FeCl3 was used as the oxidant and dopant with a mole ratio of 4:1 to pyrrole (PY). In the Fourier Transform infrared spectroscopy (FT-IR) spectrum of CS/PPY, the two bands at 1544 cm−1 and 1040 cm−1 are characteristic PPY peaks. The scanning electron microscope (SEM) results showed that the PPY nanoparticles were distributed uniformly in CS films. When the weight ratio of PY to CS was 20%, the conductivity of the composite films was 0.51 mS/cm. The CS/PPY film adsorbed more protein than the pure CS film. The results of cell viability assay showed that the composite had good biocompatibility with PC-12 cells. The “one step” method can improve the preparation processes of CS/PPY composites and provide a promising potential material for neural tissue engineering.
A Dummy-Pattern-Assisted Lift-Off Method for Small and Dense Nanostructures
Authors: Duan Tianli , Xu Kang , Wang Yao , Ma Xuhang , Zhang Rui , Gu Chengjie
Published: March 2020

Nanostructures have attracted much attention because of wide application. Moreover, most of the nanostructures play the function through small and dense patterns in irregular shape, which indicates that the fabrication process is utmost important. In general, a lift-off process is used to transfer the pattern from resist to substrate. However, for small and dense patterns, the lift-off does not work well. In this paper, a dummy-pattern-assisted lift-off method is present. With added dummy patterns, a deep and thin valley forms on the resist but does not contact the substrate. The following deposited metal film may not fully cover the valley or form a weak connection in the valley. Therefore, the metal film is easily lifted off in the valley when the sample is dipped in the acetone, which could result in a successful lift-off. This novelty method is able to improve the quality of nanofabrication by lift-off process.
The Fabrication of Micro-/Nano-Structural Antirefraction Coatings Based on the PDMS Film for Solar Cells Application
Authors: Liu Siyuan , Zhang Yaoju , Wu Zeping , Zhou Bochuan , Fang Chaolong
Published: March 2020

A simple and low-cost methodology to fabricate micro/nanostructure anti-refraction coatings (ARCs) of solar cells is introduced. The nanostructure ARCs are generated by O2 Plasma surface modification technique for a flexible polydimethylsiloxane (PDMS) polymeric film, the microstructure ARCs are obtained by soft imprint lithography, and the micro-nano complex structure PDMS ARCs are fabricated by soft imprint lithography technique combined with surface modification technique. The measured results show that these PDMS ARCs can decrease reflection loss of light from the solar cells and increase the solar cells photovoltaic conversion efficiency.
Dependency of Statistical Correlation between Ply Elastic Properties of FRP
Authors: Xu Dong , Huang Jine , Zhang Yang , Cheng Hongwei , Zhang Shufeng
Published: March 2020

Statistical correlation between ply (or lamina) mechanical properties is recently recognized as an important factor in composite structure reliability evaluation. This work provides a sensitivity analysis of stochastic variation of ply elastic properties to constitutional material (microscale) properties to reveal essential causes of the statistical correlation. Relationship between linear correlation coefficients of ply elastic properties and microscale uncertainty is derived. It is shown that if the microscale uncertainty is dominated by the uncertainty of FVR, there would be great statistical correlation between all ply in-plane elastic properties for both unidirectional and plain-weave fibre reinforced composite. Statistical correlation between ply elastic properties of plain-weave fibre reinforced composite additionally depends on the uncertainty level of unit-cell geometry.
Strain Sensing Properties of Graphene/Elastic Fabric
Authors: Bustami Shaun Bayazid , Cai Runxuan , Sun Xiaojiang , Huang Chaokun , Bi Shuguang , Ran Jianhua
Published: March 2020

The smart fabric is a new material that began to develop in the 1990s, and on the basis of the nature and function of original material, it joined the features of intelligent perception. On the performance, intelligent fiber can sense the changes of heat, light, chemistry, mechanical, temperature, and electromagnetic, then react accordingly. For smart textiles, the sensor is the core part, now most commonly used micro/nano strain sensor are using silicon and zinc oxide and others inorganic as main material. But inorganic materials have limited deformation ability, once deformation occurs, the sensor will be strictly damaged. So, the development of flexible, high sensitivity, wide range of strain of the flexible intelligent fiber strain sensor has a very important application prospect. For the stretch-able sensor, the prepared conductive material must be placed on the substrate of the flexible polymer. In this paper, graphene is used as conductive material to construct an orderly conductive layer. Waterborne polyurethane was used as dispersant and adhesive, then strengthen the interface between the layer of conductive material and elastic fabric binding force, and finally prepare a kind of high sensitivity, wide strain range, stable performance and high elastic intelligent fibers.
Anti-solvent Engineering for Efficient Perovskite Solar Cell Using PVK as Hole-Transporting Layer
Authors: Wu Shuanghong , Wang Haoyu , Wang Xiangru
Published: March 2020

Perovskite solar cells were studied using PVK as hole-transporting layer and different anti-solvent process. We have fabricated CH3NH3PbI3 (MAPbI3) photoactive layer using chlorobenzene (CB) solution and PVK in CB solution as the anti-solvent solution, respectively. The results show that the power conversion efficiency is enhanced to 14.7% by using 2.5 mg/mL PVK in CB solution as the anti-solvent, which is significantly improved compared with 12.85% for the device treated using CB. PVK in CB as the anti-solvent solution facilitates the hole transport for MAPbI3/PVK heterojuction as well as good crystallinity and less PbI2 residues in MAPbI3 photoactive layer.
Effect of Temperature on the Dispersion of Graphene in Graphene Reinforced Aluminum Matrix Composite
Authors: Wang Qiang , Sun Qingze , Chen Shengyong
Published: March 2020

The influence of hot pressing temperature on the dispersion of graphene (GR) in GR reinforced aluminum matrix composites was investigate. The microstructures of the sample were observed by optical microscope, scanning electron microscopy and energy dispersion spectrum, respectively. The temperature is hold at 640-750°C, and the interval is 10°C. The results show that GR is mainly distributed at the grain boundary at 640 °C. And GR is dispersed in the aluminum matrix, without obvious agglomeration at the temperature from 670 °C to 680 °C. However, GR is agglomerated in the aluminum matrix and has obvious regional differentiation at 690-750 °C, in which the concentrated area of GR is in the middle of the sample, and the dilution area in the rest.
Development and Application of Electromagnetic Shielding Material with Silicone Rubber Graphene Structure
Authors: Zheng Yongli , Zhao Yueju , Du Jing , Teng Jilin , Xu Shanjun , Lu Lu
Published: March 2020

A new kind electromagnetic shielding material with silicone rubber graphene structure was developed and evaluated. The silicone rubber compound material was prepared by vinyl silicone oil, hydrosilicone oil and compound coupling agent. It was made into 1-3 mm silicone rubber sheet by calendering process, and its dielectric strength, leakage resistance and mechanical properties were investigated. The graphene was modified to form graphene modified slurry, and the adhesive was introduced to disperse the graphene slurry. The initial electromagnetic shielding effectiveness, tensile strength and dielectric strength of this material are 82 dbm, 6.5 MPa and 25.3 kv/mm, respectively. The results from ultraviolet and thermal aging tests show that the intercalation between silicone rubber and graphene is stable and this material has good aging resistance. This newly developed electromagnetic shielding materials can meet the requirements of external insulation and electromagnetic shielding for field maintenance operation robots.
Study on Soil Properties of an Erosion Gully in Yanghe Basin in China
Authors: You Qinjing , Zheng Yuyang , Wu Xuanwen , Zhou Wenjiao , Zhang Feifan , Zhang Huayong
Published: March 2020

Controlling erosion gully caused by soil and water erosion is an important content of ecological restoration. In order to better allocate soil and water loss control measures, the total nitrogen content and water content in the surface soil of gully were analyzed by taking typical erosion gully in Yanghe basin as the research area. The results show that the erosion gully surface soil total nitrogen content was 0.215-1.459 g/kg, saturated moisture content ranged in 35-44%, and the permeability was between 0.0975-0.2925 mm/min. Combined with actual investigation and the experimental results, we conclude that the total nitrogen content and water content of the surface soil in the erosion gully are greatly affected by climate and vegetation conditions.
Study on the Recycling Technology of Street Tree Waste Recycling and New Lead Carbon Alloy Processing Technology
Authors: Hu Wen-Na , Wu Shinn-Dar , Cai Zhaoying , Lin Yea-Chyi , Sun Xiong-Dong
Published: March 2020

In view of the influence of road tree waste on human beings at present, and the treatment mode is single and the cost is high, with the help of ecological treatment technology and recycling garden greening waste, the pollution of greening waste can be solved, and this series of organic matter can be effectively applied to the technical development of battery material and hydrogen energy battery by introducing conductive carbon into the application point. Among them, it is mainly prepared by a special sintering technology and gas countercurrent technology, which can achieve the original appearance of retaining the leaves of the road tree, and the advantages of retaining the bulk fiber structure of the leaves after sintering, and the recovery rate is greatly higher than that of the traditional carbon materials. This technology will carburize the road tree waste, and will guide the road tree garbage carbonation technology. Entry carbon burning technology: bio-carbon market carbon black application (such as: domestic carbon rubber, tire, soil improvement), while greatly reducing carbon emissions caused by air pollution; introduction of fine carbon burning technology (NPG-SD): industry forward-looking chemical cell, fuel cell and electro thermal material technology green process design, while greatly reducing the raw materials and emissions of petrochemical industry caused by air pollution; And applied to agriculture and green energy, combined with power system integration, to achieve the purpose of complementary economy, technology and environment.
The Relationship of Different COD Concentration, Sediment Pollutant Content with Hydrodynamic in Black Bloom Water Based on Stepwise Regression Method
Authors: Shan Yu , Hong Lie , Lu Bing-Jie , Chen Jun , Jin Jie , Wu Ke , Gao Xinwu , Song Yonglian , Liu Jun
Published: March 2020

To analyze the relationship of different COD concentration, sediment pollutants with hydrodynamic. Taking a polluted river as the research object, the data of flow velocity, water temperature, COD concentration, sediment OM content, sediment TN content and sediment TP content at nine sampling points were analyzed by stepwise regression and SPSS 25 data analysis software. Construct linear regression model of COD concentration Y, river flow velocity X1, water temperature X2, sediment OM content X3, sediment TN content X4, sediment TP content X5. The regression equation Y=106.172-64.304X4+ 0.065X5with correlation coefficient R=0.954 and determination coefficient R2=0.91 was obtained by stepwise regression method. The results showed that the concentration of COD in water was correlated with the content of nitrogen and phosphorus in river sediments, and negatively correlated with the content of TN and positively correlated with the content of TP. The model can be used to estimate COD load of water body by analyzing the nitrogen and phosphorus content in river sediments.
The Influence of Barrel Offset on Cylinder Liner-Piston Ring Lubrication State
Authors: Liu Deliang , Zhang Shifeng
Published: March 2020

The shape of the barrel surface is an important parameter of the piston ring, and it is also one of the key factors determining the lubrication state of the cylinder liner-piston ring friction pair. To research the influence of barrel surface shape on the lubrication performance of cylinder liner piston ring, a transient three-dimensional lubrication model of cylinder liner piston ring is established by combining the average Reynolds equation and green wood formula. The lubrication performance of this friction pair under different working conditions and different cylinder surface shape is analysed, which provides the basic numerical research for the shape optimization of piston ring.
The Analysis of Drug Resistance of the Strains of Lactic Acid Bacteria Isolated from Yoghurt Made in China and Outside of China
Authors: Ma Guangqiang , Niu Ling , Han Fei , Liao Yongcui , Yang Ming
Published: March 2020

To analysis and compare the drug resistance of lactic acid bacteria isolated from yoghurt made in China and outside of China. Yoghourt products were purchased from Nanchang supermarkets. The Lactic acid bacteria bacterias in yoghourt were isolated by MRS, MC and M17 medium. The isolated strains were identified by gram’s stain, colony morphology observation and biochemistry reaction test. Drug resistance analysis of the identified strains were analyzed by K-B method. 26 kinds of Lactic acid bacteria, 13 strains of cocci and 13 strains of bacillus, were isolated. All strains were identified by physiology and biochemistry test. They were Lactic acid bacteria bulgaricus, Lactic acid bacteria delbrueckii subsp. Bulgaricus, Streptococcus thermophilus. Bifidobacteria (Bacillus bifidus). Drug resistance analysis revealed that the 26 strains of Lactic acid bacteria showed multiple drug resistance to 13 kinds of antibiotics, such as kanamycin. And all of these Lactic acid bacteria were completely resistant to kanamycin, ampicillin and oxacillin. The drug resistance spectrum of China’s Lactic acid bacteria is similar to that of foreign Lactic acid bacteria, but the drug resistance of China’s Lactic acid bacteria is significantly stronger than that of foreign Lactic acid bacteria. The abuse of antibiotics is serious in dairy industry. We should strengthen the management of antibiotics, reduce the chance of super resistant bacteria, and maintain the food health of the general public.
Study on Environmental Pollution and Regulatory Effects in China’s Manufacturing Industry
Authors: Zhang Xiaoyun
Published: March 2020

Based on the factual data of various pollutants discharged from the manufacturing industry from 2003 to 2015, the current situation of environmental pollution in China’s manufacturing industry is described; and the evaluation index of administrative order type and market incentive type environmental regulation tools is constructed to measure the environmental regulation intensity of manufacturing industry. On this basis, this paper puts forward targeted recommendations for policy to provide valuable reference for the green development of the manufacturing industry and ecological environment protection.
Study on Erosion Status of Typical Small Watershed in Yanghe River Basin
Authors: Zheng Yuyang , You Qinjing , Zhou Wenjiao , Wu Xuanwen , Zhang Feifan , Zhang Huayong
Published: March 2020

A typical small-scale watershed in the Yanghe River Basin is selected as the research area, and the regional digital elevation model map (DEM) is studied by using the aerial photography of the drone. Based on the arcgis10.4 platform, the SWAT model was used to extract the water system and determine the boundary of the study area. The meteorological data of the SWAT model comes from the automatic weather station at the study area center. The physicochemical properties of soil surface samples and soil profiles were determined in the study area in July each year. The results were used as parameters of the SWAT soil model, and determine other parameters of the SWAT model by Sensitivity analysis. The soil erosion status of the study area was obtained, and the soil erosion in the study area was studied. It is more serious and the erosion channel has a tendency to expand further. According to the erosion status and development trend simulated by the SWAT model, it provides reference for soil and water conservation control measures.
Research on the Design of Recycling Medical Needle Safety Bayonet-Lock Box
Authors: Lan Tong-Tong , Wu Shinn-Dar , Tsai Po-Wen , Yang Yu-Lin
Published: March 2020

In order to avoid contaminations and spread of diseases in the use of needles, hospitals adapted disposable policy after one single used. Needles should be used only once and must be disposed of for recycling to avoid infections and spread of diseases. Also to avoid any poking accidents to the medical staffs and recycling personnel in the process of collection, it was accustom to put the needle head back to the needle case, but because the hole of the needle case is small, medical personnel could be by accident or carelessness poke the needle to his or her own hand. This design proposes an innovative collection box for the needle of syringe recycle under safety and management consideration. It can effectively recycle needles in real time and record the time of using needles. It can avoid people repeated use of drugs at home that is a mentally disabled. It is not only simple in structure and low costs, but also easy to operation. It can avoid puncturing the medical personnel and personnel who recycle medical waste. This collection box is composed of a box body and a box cover. On the box cover, it contains one or more needle recycle holes. The needle can be plugged on the needle recycle hole. And the hole has a large circular portion of the fixed ring. Furthermore, the top end with several Bumps structure called Fixing pin fork can restrict the needle to avoid detachment on the inner side of in the upper diameter hole. Therefore, plugging the needle into the box cover and using Fixing pin fork at in the upper diameter hole can separate the needle and syringe. After that, the used needle and syringe can be stored inside the collection box. In this design, it demonstrates a simple structure with a low production cost. Moreover, it is very convenient for people usage.
A systematic computational study of electronic, mechanical, and optical properties of Fe1−xCox alloy
Authors: Hossain Ali , Khalilur Rahman Khan M , Sarker Md Samiul Islam
Published: March 2020

This report demonstrates the systematic study of electronic, mechanical, and optical properties of Fe1−xCox alloy (x = 0.00, 0.05, 0.10, 0.15, 0.20, and 0.25) using plane wave ultrasoft pseudopotential based on spin-polarized density functional theory. The upshots expose overlapped of valence and conductance states and confirms electronic bands polarization. The energy bands are significantly shifted with increasing Co atoms. The dispersion energies reveal anisotropic behavior of electronic energy levels. The density of states manifests strong electronic interaction between Co and Fe atoms. The spin polarization is mainly attributed from the exchange interactions among electronic spins, which confirms the strong electron-electron interactions. Subsequently, spin polarization induces spin magnetic moments. Minority spin states are dominant for Fe1−xCox alloy, which significantly changed the electronic properties. Moreover, Elastic constants confirm that all the phases of Fe1−xCox alloy are mechanically stable, and the higher elastic modulus manifests better performance of the resistance to shape change and against uniaxial tensions. The optical properties of FeCo alloy exhibit strong interrelation with atomic composition of Fe and Co. The loss spectra reveal high plasmonic resonance that can be chemically tuned through atomic composition. The spin magnetic moments and high plasmonic resonance make the Fe1−xCox alloys as the prominent mechanically stable materials for magneto-optical applications.