bluuebunny/crossref_metadata_2025 huggingface dataset:
Properties of natural rubber (NR) and wood/NR composites as gamma shielding materials
Authors: Ninyong K , Wimolmala E , Sombatsompop N , Saenboonruang K
Published: August 2019

In this work, gamma shielding, cure characteristics, and mechanical properties of natural rubber (NR) and wood/NR composites was investigated with the addition of lead (Pb) powder for potential use as flexible shielding materials. The content of Pb powder in this work was varied from 0 to 50 part per hundred parts of rubber by weight (phr) in 10-phr increment. The results showed that the increases in Pb contents led to the improvement in gamma attenuation but had negligible effects on cure properties of the composites. The increases in Pb contents reduced overall tensile properties of the NR and wood/NR composites, while the addition of 20-phr wood particles in wood/NR composites increased the tensile strength, elongation at break, surface hardness, and dimensional stability. Hence, the overall properties investigated in this work suggested that the developed NR and wood/NR composites could be used to attenuate low-intensity gamma rays produced after former steps of shielding such as after thermal neutron or beta shielding.
Impact strength enhanced bioplastic polylactic acid by interfacial bonding with hydroxylated natural rubber
Authors: Boochathum P , Mingwanish W , Pivsa-Art S
Published: August 2019

The effect of functionality of HNR and weight composition of PLA:HNR on the mechanical properties, impact strength, water vapour and oxygen gas transmission rates was studied. From morphology result, co-continuous phases in PLA:HNR050 and PLA:HNR035 were more obvious than PLA:HNR025. The observed co-continuous phases might be caused by the interfacial bonding between PLA phase and HNR phase. Better compatibility between HNR035 and PLA was believed to result in the considerably improvement of impact strength and slight reduction of mechanical properties of PLA. It is interesting that water vapour and oxygen gas transmission rates of PLA significantly increased with HNR035 loading. As a result, the appropriate weight composition of HNR035 blended with PLA was clarified to be 70:30 that was about tipple higher than the composition of NR as reported in the previous studies.
Formation Mechanism of Rutile in Sulfate Process
Authors: Wang Zinan , Chen Kui , Zhu Jiawen , Zhou Xiaokui , Lin Farong
Published: August 2019

In the sulfate process for the production of TiO2 white pigments, amorphous metatitanic acid is calcined to microcrystals of the rutile polymorph by experiencing the dehydration, desulfurization, crystallization into anatase and the phase transformation from anatase to rutile (ART). Surface structure and thermal stability of metatitanic acid was characterized by Simultaneous Thermal Analyzer (STA) and FTIR Spectrometer. Powder X-ray diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM) were used to describe the changes of phase composition and granule morphology. It was found that Free SO4
2- ions and S=O asymmetric structure existed on the surface of metatitanic acid as well as H2O with various adsorption state. The calcination intensity has a much stronger impact on crystallinity’s increase than dehydration, desulfurization. The temperature region of phase transform was 900∼1000°C. Rutile would not appear until amorphous metatitanic acid has crystallized into anatase completely and the anatase grain was in a slow growth before that. It was also found that particles were mutually merged by means of fusion of grain boundaries.
Synthesis of Ni Co-LDH by Microwave as the Electrode Material of Supercapacitor
Authors: Zhang Bin , Xue Weidong , Zhao Rui
Published: August 2019

In order to deal with energy and environmental problems, more and more researches have been made on electrode materials of supercapacitors in recent years. Among many electrode materials, layered double hydroxides (LDHs) is favored by researchers because of its high theoretical capacity. In this work, we report a facile route for synthesizing Ni Co-LDH, we choose the ZIF-67 as the template and the source of Co to synthesis Ni Co-LDH by microwave in the mixture of ethanol and DIwater. Through this route, the Ni Co-LDH can be synthesized in 3 min. The as prepared Ni Co-LDH exhibits outstanding specific capacitance of 2376F·g−1 at 1A g−1 and it can maintain 84.61% of its initial value after 1000 cycle. Asymmetric supercapacitor(M-3//GO) with a maximum voltage of 1.5V has demonstrated a high energy density of 39.28Wh·kg−1, a high power density of 7513W·kg−1 at 20.21 Wh·kg−1.
Dynamic Response of High-piled Wharf Pile Subjected to Underwater Explosion
Authors: Liu Jinghan , Tang Ting , Wei Zhuobin , Li Lingfeng , Zhang Yuanhao
Published: August 2019

In order to study the dynamic response of high-piled wharf pile subjected to underwater explosion, pile was simplified as an elastically supported beam. The computational model of pile was established. The correctness of the calculation model was verified by theoretical analysis. The dynamic coefficient Kd was an index to the displacement and deformation of pile. In order to further investigate the dynamic response of pile, typical high-piled wharf piles subjected to shock wave load and bubble pulse load were analysed. The results show that horizontal stiffness has more impact on dynamic coefficient than torsional stiffness. The bubble pulse load poses a greater threat to pile than shock wave load. The peak load and load duration are the significant facts influencing dynamic coefficient in shock wave phase. The load duration is the significant factor influencing dynamic coefficient in bubble pulse phase.
Effect of Peanut Shell Biochar on Dynamic Changes of Nutrient Elements and Heavy Metals during Sewage Sludge Composting
Authors: Chang Xingtao , Yue Jianzhi , Jia Yangyang , Chen Fuyang , Ma Hao , Li Shaowei , Hu Jianjun
Published: August 2019

The effect of peanut shell biochar (PB) addition on thermophilic compost of sewage sludge (SS) with wheat straw was investigated. Four treatments were designed with different concentrations of PB0% (CK), PB10% (H1), PB20% (H2), PB30% (H3) (on dry weight of compost basis). The pH value, electrical conductivity (EC), total nitrogen (TN), total phosphorus (TP), total potassium (TK), and the different speciation of Cu and Zn were determined. After 30-days of compost, the growth rate of EC values of four treatments were 113.20%, 98.98%, 89.62% and 79.82%, respectively, and they were1.31%, 4.63%, 5.06% and 6.51%, respectively for pH value, the loss rate of TN was 18.96%, 16.25%, 12.51% and 12.44%, respectively, the growth rate of TP were 19.72%, 42.03%, 62.26% and 89.99%, respectively, and they were 63.59%, 81.21%, 91.14% and 94.05% of the TK. The maximum passivation rate of Cu was 9.72%, when PB adding was 30%. As for Zn, only 30% PB adding can reduce the activation of Zn. Treatments with PB had a lower value of EC and a higher value of pH than CK, and contributed to the increase of the contents of TN, TP and TK, relatively. Bioavailability of Cu and Zn decreased with the increase of PB addition. It is suggested that in the range of the study, the addition of 30% PB was the optimal choice which had the most effective effect on improving composting nutrient and reducing the bioavailability of heavy metals Cu and Zn.
Simulation and Modelling in Cracks Prevention of Early Age Concrete
Authors: Shi Nannan , Li Zhenbao , Liu Yashuang
Published: August 2019

Cracks often arise in mass concrete structures, due to the thermal stress and low tensile strength of early age concrete. To prevent the undesired thermal stress induced crack, controlling the temperature of concrete has been considered as an effective approach. In this paper, a temperature controlling measure evaluation system (TCMES) is proposed, which includes distributed fiber optic temperature monitoring, prediction of temperature and stress fields, and concrete crack risk evaluation. We first experimentally monitor the temperature evolution of the concrete using the distributed fiber optic temperature sensing. Then thermal parameters of in-situ concrete are retrieved by performing back-analysis. Subsequently, the concrete temperature field and thermal stress field can be predicted from the retrieved parameters and the experimental parameters of concrete. Under the concrete crack risk evaluation principles, temperature controlling measures for different stages are proposed. Our analysis indicates that the proposed system is an effective approach to prevent cracks of early age concrete.
Fabrication a Photoresponsive Film for Controlled Pesticide Release
Authors: Xu Qing , Liu Guohua , Feng Tianhong , Zhou Yuanjing
Published: August 2019

To design and prepare targeted pesticides with environmentally responsive controlled release via compound and chemical modifications has shown great potential in creating novel pesticide formulations. Biological pesticide has spurred demand for efficient and effective delivery systems. In this work, an environmentally photoresponsive controlled release pesticide film was developed by encapsulating biological pesticide with spiropyran-grafted polyacrylic acid polymer as carrier and carboxymethyl chitosan as film-forming agent. Spiropyran-grafted polyacrylic acid polymer carrier had the characteristics of pH and light response. Under the pH response, pesticides were encapsulated. And under the light response, controlled release of pesticides was realized. A series of biological pesticides were encapsulated in the photoresponsive carrier and had high encapsulation rate. The photoresponsive polymer films could therefore be considered an efficient material for application in controlled release systems in agriculture.
Mechanical Spectra in Various Weld Area of an Extruded Al-12.7Si-0.7Mg Alloy with MIG Welding
Authors: Yu N , Geng Y , Ji J W
Published: August 2019

Mechanical spectra of ascending and descending temperature in the various areas of weld for an Al-12.7Si-0.7Mg alloy with an extruded states were measured under different frequencies. It is found that there is an obvious internal friction peak near∼200°C in the ascending temperature spectrum and the value of internal friction goes up started at∼300°C resulting in the ∼200°C peak lowered and appeared an peak nearly ∼270°C in the descending temperature spectrum for the matrix and heat affected zone; while there is not any peak in the weld zone, Discussion to the results was made.
Influence of Space Radiation Model Uncertainties on the Solar Absorptance Evaluation of OSR Second Reflector
Authors: Shen Zicai , Xia Yan , Liu Yuming , Tian Dongbo
Published: August 2019

Space radiation model uncertainties may have important influence on the evaluation of thermo physical properties of anti-electrostatics thermal control materials. The sources of space radiation model uncertainties are analyzed and the uncertainty factor is defined firstly, then the simulation test was performed on the surface resistivity of OSR in electron or proton radiation environments. After that, the influence of space radiation model uncertainties on the solar absorption of OSR was analyzed. As the increase of irradiation fluence, the influence of space radiation model uncertainties on the solar absorption increases firstly and then decrease utile it can be ignored. The influence of space radiation model uncertainties on surface resistivity of OSR increases with the uncertainty factor. When the uncertainty factor lower than 1, the error from space radiation model uncertainty to surface resistivity of OSR is positive, while the uncertainty factor larger than 1, the error is negative.
Applicability Analysis of New Type of Waterproof and Drainage Partition Theory for Tunnels
Authors: Luo Guang , Bai Weizhen , Zhang Yun
Published: August 2019

Based on the shortcomings of the existing anti-drainage partitioning methods, this paper proposes a new partitioning method with solutions to the shortcomings. Thoroughly waterproofing with a “Shi” type waterstop in the length of one section, partitioning drainage with a sump tank. According to the basic formula of Darcy’s law, the calculation formula of the partition length is derived. The calculation of the Yaoshan to Nandan Highway Layi tunnel is carried out. The recommended value of the partition length is given. The numerical simulation is used to verify the applicability of the partitioning method.
Numerical Simulation Study on Influence of Structural Interspace on Anti-penetration Performance of GFRP and Steel Composite Armor System
Authors: Zhang Yuanhao , Cheng Zhongqing , Hou Hailiang , Zhu Xi , Liu Jinghan , Li Lingfeng
Published: August 2019

In this study we investigated the influence of the structural interspace on the ballistic performance of GFRP and steel composite armor system, using finite element analysis by ANSYS/LS-DYNA to simulate, found out the failure modes of steel plates and GFRP plates, and analysed the anti-penetration mechanisms of the composite armor systems. The results indicated that impact by high velocity projectiles, the failure modes of GFRP plates change greatly by setting structural interspace, but less influence on the failure modes of steel plates. Impact by high velocity projectiles, structural interspace has little effect on the anti-penetration performance of steel-GFRP armor structure. Enough interspace can improve the antipenetration performance of GFRP-steel armor structure, but the anti-penetration performance changes little with the increase of the interspace.
Analysis of Effects of Winter Construction Treatments on Fiber Concrete Samples Using an Improved Box Dimension Method
Authors: Li Yi , Guan Cong
Published: August 2019

The influence of winter construction on the microstructure of hybrid fiber concrete was studied. Ordinary concrete, basalt-polypropylene (BP) fiber reinforced concrete, and steel-polypropylene (SP) fiber reinforced concrete were investigated under three different working conditions: construction during winter without any protective measures, with some construction modification, and with standard curing and protection. The characteristic parameters of the resulting concrete microstructure were obtained using the Denmark Rapidair457 test system. Because the traditional box dimension method is unable to accurately analyze the uniformity of the pore size distribution. An improved box dimension method was used to accurately determine the scale-free interval, allowing comparative analysis of the fractal characteristics of the same concrete material under different working conditions. The results show highest air content for samples constructed during winter without any protective measures, followed by samples constructed during winter but with modified construction measures, and then lowest for samples constructed using standard maintenance practices. The specific surface of pores and the fractal dimension was highest for samples constructed using standard maintenance practices, followed by samples constructed during winter with modified construction measures, and then lowest for samples constructed during winter without any protective measures. The fractal dimension increased as the air content decreased, and increased as the specific surface increased. The pore structure test results were consistent with the analysis of the fractal dimension.
Research on the Method of Wire Impact Suspension Type Spanning Frame
Authors: Jia N , Xia Y J , Wan J C , Hu Y S
Published: August 2019

With the intensive construction of the UHV DC transmission project, the hidden dangers of the wire running line impacting the suspension type spanning frame are gradually increasing, and the dynamics of the wire-to-suspension type spanning frame is rarely studied in depth. In this paper, the dynamic response of the wire to the suspension type span at different heights is studied. It is concluded that as the height of the wire increases, the value of the main stress received by the wire rope is gradually increased when the net is hit. The greater the vibration that the net is subjected to, the slower the main stress of the netting rope decays with time.
QUV Accelerated Aging Effects on the Structure and Properties of Polyether Polyurethane Fibers
Authors: Zhong Yanping , You Gexin , Cai Sidi , Yang Bo
Published: August 2019

This paper presents an experimental study about the effects of UV irradiation on polyether polyurethane (PU) fibers investigated by FTIR, SAXS and AFM, and the multiple mechanism is finally proposed.The results show that, at low UV irradiation (0.6W/m2, 0.9W/m2), the mechanism responsible for UV degradation of polyether PU fibers could be described as a primary reaction causing the break up of chemical bonds and forming the new quinone structure, along with a secondary reaction to explain hydrogen peroxide formed in the presence of UV irradiation, water and oxygen environment which promotes QUV aging by providing loose structure of polyether PU fibers. Moreover, the micro phase separation is promoted for a parallel reaction occurred to produce new polyether PUs and more compact micro domains by the residual isocyanate in pre-polymerization stage and alcohols formed under QUV aging. Under higher UV irradiation (1.2W/m2, 1.5W/m2), in addition to the primary reaction, a tertiary reaction showing the re-polymerization occurred under accumulation of aging products (carboxylic acids and alcohols) is also considered as the mechanism, while the secondary reaction would be inhibited for the peak assigned to H2O2 is not observed. Also, this decreases micro phase separation of polyether PU fibers for the primary reaction is dominant.
Synthesis and Properties of 2-Acrylamide-2-Methyl Propane Sulfonic Acid -Graft-Guar
Authors: Du Xiaowei , Wang Pengyuan , Liu Jianye , Niu Chunmei
Published: August 2019

2-acrylamide-2-methyl propane sulfonic acid (AMPS) was grafted onto guar macromolecules using biodegradable guar as raw material, persulfate potassium (K2S2O8) and sodium sulfite(Na2SO3) redox system as initiators. The different influence factors on graft reaction were investigated to determine the ideal reaction conditions. The sulfonated guar with high viscosity has good salt resistance, compatibility and stability with the toothpaste components, which can improve toothpaste tailing phenomenon and meet the requirements of water-based adhesive and thickening agent in other industries.
The Analysis and Design of Small Air Purifier
Authors: Zhu Zhiwei , Jin Hongyan
Published: August 2019

This design is positioned in the outdoor air environment is increasingly deteriorated premise through the improvement or redesign, to improve people’s workplace environment for desk type air purifier; and stylish innovation to meet the fast-paced city life crowd physiological and psychological needs to improve the quality of life and work purposes. Innovation of a product, in addition to hoping to facilitate people’s lives, but also hope to gradually change the way people live and work to improve people’s spiritual pursuit, promoting the formation of the concept of healthy living, create a harmonious and warm office environment.
Effect of Fly Ash and Silica Fume on Mechanical Properties of High-Performance FRCC
Authors: Pan Zhang , Zeng Xiaohui , Hu Zhongwei
Published: August 2019

Based on the development and application of high-performance FRCC (Fiber Reinforced Cementitious Composite), the effect of different content of fly ash and silica fume on the compressive strength, flexural strength and toughness of high-performance FRCC is studied. The results show that the addition of fly ash and silica fume significantly affects the mechanical properties of high-performance FRCC. The specific optimization content with 50% ash and 15% silica fume can make the flexural strength of high-performance FRCC up to 19.5MPa, the compressive strength to75.2MPa, and the ratio of bending strength to compressive strength to about 0.26. Compared with ordinary fiber reinforced cementitious composite, its flexural strength and compressive strength are increased by 35% and 40% respectively and the ratio of bending strength to compressive strength is increased by about 6%. It can be seen that the optimization mixture can significantly enhance the compressive strength, flexural strength and toughness of high-performance FRCC and may provide reference for practical use.
Study on Substation Seismic Resilience Evaluation Index and Resilience Matrix
Authors: Liu Rushan , Hu Zhenxiu , Shu Rongxing
Published: August 2019

This paper proposes a seismic resilience grading method for 110Kv and above high-voltage substations, and establishes a quantitative index for evaluating the substation seismic resilience --- seismic resilience index, presents a calculation formula for substation seismic resilience index which takes the respective weight coefficients and seismic damage indexes of buildings and high-voltage electrical equipment as the parameters, determines the relationship between the resilience index and the resilience grade, and establishes the substation resilience matrix through making statistics of actual seismic damage and recovered samples of the substations. The results show that with the decrease of resilience index, the resilience of substation becomes worse and worse. When the resilience index is lower than 0.45, the substation reaches the threshold of extremely difficult to recover. The higher the seismic intensity is, the lower the resilience is, and the longer the recovery time is. In 9 degree seismic intensity region, the substation resilience index begins to decrease rapidly, most substations are recoverable and difficult to recover, and the substations in 10 degrees and above seismic intensity region are extremely difficult to recover.
A Wide Range of pH-Sensitive Fluorescent Probe based on Responsive Double Hydrophilic Block Copolymer for Real-Time Intracellular pH Sensing in Water Samples
Authors: Zhou Zijuan
Published: August 2019

In this work, a wide range of pH-sensitive fluorescent probe has been designed by the responsive double hydrophilic block copolymer (DHBCs), which containing the fluorescein (Methacrylic salicylaldoxime, SHMa) and rhodamine (Rhodamine B methacryl hydrazide, RhSAMa) derivatives in the DHBCs. The pH-sensitive fluorescent probe gave blue and red fluorescence emissions at basic pH and acidic pH, respectively. Moreover, the fluorescent probe exhibited changes in fluorescence intensity with an alteration of turbidity of the block copolymer induced by temperature. Furthermore, we have developed a model that combines with the mobile phone for quantitative and qualitative measurement of pH value. The color extract APP for real-time pH measurement in mobile phone was constructed and used to detect the pH of the water samples.
Study on Distribution Characteristics of Key Target Personnel Density and Earthquake Rescue Strategy
Authors: Liu Rushan , Yan Lupeng , Yan Dongqi
Published: August 2019

The first priority after a catastrophic earthquake is to carry out emergency rescue for people buried in collapsed buildings. Some large public buildings often have a high concentration of personnel and are the key targets for emergency rescue during earthquakes. This paper summarized four survey methods for the indoor personnel density of key buildings, carried out a sampling survey on indoor personnel density in different time periods in some schools, hospitals, shopping malls, and cinemas in Yanjiao District of Sanhe City in China using these methods, investigated the changing raw of the personnel density in these key target buildings within a period of one day and the changing characteristics of the personnel density in working days and holidays, compared the differences in the time distribution of the personnel density among different types of key targets, and initially explored the strategies and attention points of rescue for indoor personnel in different key targets at different original times of earthquake, thus providing reference for rescue decision-making of indoor personnel in key buildings in the event of a sudden disaster.
Non-isothermal Ageing of an Al-Mg-Si Alloy for Enhanced Anticorrosion Performance
Authors: Zheng Yaya , Luo Binghui , Wang Shuai , He Chuan
Published: August 2019

The effects of different heat treatment processes on the comprehensive properties of Al-Mg-Si were investigated. The results show that the microstructures changes by T6, T73 and non-isothermal aging (NIA) lead to different hardness and electrochemical properties. The β” strengthening phase of T6 alloy has fine dispersion, uniform size and maximum sensitivity to intergranular corrosion (IGC). The hardness of alloy crystal is the lowest after T73 treatment. The number of β” phases in the crystals of the NIA-treated alloy is the largest, but there is a small amount of coarsened β” phase, and the grain boundary precipitates are intermittently distributed. The IGC sensitivity is the lowest. The NIA-treated alloy has both high strength and good corrosion resistance, which is related to the formation of a large amount of precipitates in the crystal at low temperatures and the growth and coarsening of intergranular precipitates at high temperatures.
Study on Chinese Sign Language Comprehension of Drug-induced Neurotic Deaf Children after learning language
Authors: Guo Huang , Li Qiang
Published: August 2019

This study requires the study subjects to complete the tasks of observing and imitating sign language and carries out magnetic resonance examination. Analysis of the activation of the brain region when the subjects observe and imitate sign language.
Three-Dimensional Pose Parameters Measurement of Air Target
Authors: Li Xinghong , Ji Taize , Ji Ren
Published: August 2019

In view of the present in aerospace measurement and control range, air vehicle in the field of Three-dimensional pose measurement problem, this system on the basis of inheriting the existing successful experience, using the theory of digital photogrammetry closely and the forefront of the computer vision result, proposed by sequence images of photoelectric theodolite film determines the attitude of the spacecraft three dimensional space plan, will change ever flight target as a particle processing, unable to get the current situation of the flight target Three-dimensional pose parameters, make full use of the measuring position and shape of image information, through the establishment of theodolite camera imaging simulation system, to predict the position of aircraft targets.
Influence of Hydroxyl Silicone Oil on Mechanical and Electrical Properties of Silicone Rubber-based ceramizable composites
Authors: Kuang Guowen , Yang Kunpeng , Tang Hongchuan , Li Yonglan , Li Qian , Li Penghu , Zhu Pengfei , Jin Haiyun , Gao Naikui
Published: August 2019

By introducing hydroxyl silicone oil into silicone rubber-based ceramizable composites(CSR), the structural problems of nano-silica in CSR are inhibited. The influence of hydroxy silicone oil content on the mechanical and electrical properties of CSR was investigated. And the chemical, physical and mathematical models were established to explain the influence mechanism. The results show that the hydroxy silicone oil inhibits the structural problem and improves the dispersion of nano-silica in CSR, which are contribute to the increases of tensile strength and elongation at break of CSR. And the volume resistivity decreases as to interface barrier decreasing, the loss factor decreases as to the decay of space charge polarization, the ac electric strength increases with mean free path of free charge decreasing. However, the relative permittivity of CSR is not sensitive to hydroxy silicone oil content.
Evaluation of the Effect of Paints Reproducing Ocean Color in Visible Light Range
Authors: Li Yumei , He Shufang , Liao Ningfang , Li Yasheng , Bai Xueqiong , Deng Chenyang
Published: August 2019

In order to achieve the goal that the paints can reproduce the real ocean color, the color reproduction effect of paints is evaluated in this paper. 15 paint blocks and three standard sea spectra including coastal water, medium sea and high sea were selected as experimental samples. The spectral reflectance of paints was measured by X-Rite Color-Eye 7000A spectrophotometer, which were used as the experimental data samples. Then the chromaticity value and spectral evaluation index of paint colors and ocean colors were calculated by using D65 light source and tristimulus value under 10 degree viewing field. At last, from the aspects of chroma and spectra, the analysis and evaluation were carried out. The evaluation results show that the combination of chroma evaluation and spectral accuracy evaluation can accurately evaluate the effect of paints reproducing marine color, which is of great significance to produce the paints reproducing real ocean color.
Transfer Behaviors of PFPE Lubricant from Disk Surface to Slider
Authors: Zhang C B , Ao H R , Zeng Q Y , Jiang H Y
Published: August 2019

The rapid growth in storage areal density of hard disk drive (HDD) forces the flying height of slider has been currently reduced to less than 2 nm. In such a narrow spacing, perfluoropolyether (PFPE) lubricant is easier to transfer from disk surface to slider under fluid force field and heat transfer field, which is found to have a great effect on date storage reliability. Firstly, the lubricant transfer volume expression with respect to lubricant molecular weight is established. Secondly, the finite element models (FEM) of both Tri-pad positive pressure slider and flat slider are developed, and based on this, the PFPE lubricant transfer behaviors in HDD are investigated. Finally, four type unite cells composed of lubricant molecules and air molecules are established by using Materials Studio software, then both dynamic temperature and diffusion coefficients are researched based on molecular dynamics theory. Results show that the PFPE lubricant amount decreases with increasing pitch angles, rotation angles, slider flying height and disk rotation velocity, while it increases when heat source power increases. The diffusion coefficients of ZTMD lubricant is the maximum in the four lubricants we researched, while the temperature change ratio of Z-15 lubricant is the maximum.
Growth Mechanism of Continuous Monolayer MoS2 Prepared by Chemical Vapor Deposition
Authors: Wang Wenzhao , Zeng Xiangbin , Guo Zhenyu , Ding Jia , Chen Xiaoxiao
Published: August 2019

Molybdenum disulfide (MoS2) is a cutting-edge layer-dependent two dimensional semiconductor which monolayer is direct-bandgap. Nano-scale monolayer MoS2 has big potential in electronics and optoelectronics devices. In this work we reported the progress in growing continuous single layer MoS2 by ambient pressure chemical vapor deposition (APCVD). Scanning electron microscope (SEM), Raman, photoluminescence spectra (PL) and atomic force microscopy (AFM) disclose that as-grown films are large-area monolayer and of high quality. SEM observations also clearly reveal the growth process of these films. Figuring out the growth mechanism grants growth of large scale continuous MoS2, and lays the foundation for wide device applications in the future.
The Study of the Polarization Errors of All Fiber Optical Current Transformers
Authors: Zhang Xingjian
Published: August 2019

In-line Sagnac fiber optical current transformer is a new kind of all fiber current sensors. By using the Jones Matrices formalism, the polarization errors of the FOT is studied. By using the Jones Matrices formalism, the expression of the main optical parts of the FOT are built, and the the expression of interference is got. The precision which is affected by the parameters of the main optical parts is analyzed.
Synthesis and Characterization of Chiral azo LCPs
Authors: Zhang Xuesong , Huang Yuejiao , He Xiaozhi
Published: August 2019

Precursor polymer MP series were synthesized by 4-allyloxybenzoic acid cholesteryl ester (M) and 4- hydroxyphenyl 4- (propionyloxy) benzoate (P). We obtained novel themotropic side-chain liquid crystal polymer MPZ series by esterification between MP series and 4-((4-ethoxyphenyl) diazenyl) benzoic acid (Z). Differential scanning calorimetry (DSC) was used to measure the thermal properties of those polymers, and the mesogenic properties were characterized by polarized optical micrograph (POM), DSC and X-Ray. MP series exhibited yellow, green, blue and purple Grandjean textures. MPZ series also showed colorful Grandjean textures. They exhibited thermotropic liquid crystal properties in a broad mesogenic region.
The Existence and Upper Bound of Periodic Solutions for Two-Coupled-Oscillator Model in Optics Chiral Molecular Medium
Authors: Shi Xiaoyue , Li Jing , He Bin , Zhu Shaotao
Published: August 2019

In this paper, we focus on the two-coupled-oscillator model in optics chiral molecular medium. We perform scale transformations for variables and study the existence of periodic solutions in detail for the two-coupled-oscillator system. We obtain the Melnikov function by establishing the curvilinear coordinate transformation and constructing a Poincaré map. Then the existence of periodic solutions of this oscillator system is analyzed when unperturbed system is Hamiltonian system. We apply them to discuss the upper bound of periodic solutions of this oscillator system and give the configuration of the phase diagram by numerical simulation. It has great theoretical significance to study the non-planar motion of the two-coupled-oscillator system for analyzing dynamic characteristics in optics chiral molecular medium.
Effect of Solvents of Quantum Dots on QLED Performance
Authors: Yang Min , Chang Chun , Zhang Wenjing , Liu Zilei , Zhang Qin
Published: August 2019

The QLED that we are making now, in addition to the evaporation of the a layer, the other layers are generally obtained by solution spin-coating. In our experiments, the selection strategies for quantum dots and adjacent layers of solvents were summarized. Based on these strategies, we selected the appropriate solvent to obtain high quality films, and in order to avoid the quantum dot film laye being corroded, and the surface having streaky defects, thereby hindering the high performance of the device. This solvent selection strategy provides a common method for preparing high quality films for most solution processed multilayer optoelectronic device.
Flow Field Characteristics in the Combustion Space of a Float Glass Furnace with Co-combustion of Heavy Oil and Petroleum Coke
Authors: Mei Shuxia , He Feng , Xie Junlin , Jin Mingfang , Zhong Liyang , Wang Zhimin
Published: August 2019

A numerical simulation was carried out for the combustion space of a float glass furnace in which the heavy oil and petroleum coke were co-fired. The characteristics of gas flow in the combustion space and its influence on the temperature distribution were analyzed. The research shows that after the combustion air coming from inlet 2 to inlet 6 respectively enters the flame space, it flows toward the outlet, and forms a relatively straight “flame” after the fuel is completely burned, eventually forming five high-temperature zones with wide coverage; when the flue gas generated by the combustion reaches the outlet, a part of the flue gas from inlet 2 to inlet 4 is deflected to the left, and a recirculation zone is formed above the batch material zone at the left end, and the O2 is diluted, so that the fuel at No. 2 zone is not sufficiently burned, resulting in a temperature region being significantly lower than other regions; A part of the flue gas at No. 5 and No. 6 is deflected to the right, forming a recirculation zone above the clarification zone at the right end, so that the combustion at No. 7 is insufficient, resulting in a lower temperature zone at that place, but the influence is weaker than that at No. 1, so the temperature peak at No. 7 is slightly higher than that at No. 1.
Practice of Trajectory Control Technology for Directional Wells with Small Deviation in Yan’an
Authors: Ma Chao , Gao Baokui , Wang Lisong , Hu Tianxiang , Wang Jieli
Published: August 2019

The well track irregularity, azimuth drift, and slow ROP are severe problems in the build and maintain angle sections of wells on An 7 platform. By analyzing the influences of structure factors of steerable assembly with one bend on the guiding ability, the stabilizer counts, positions and outer diameters in assembly is optimized. The BHA scheme which is suitable for small inclined directional well is proposed. Results show that some measures can be implemented, such as 1) predicting “azimuth advance angle” in directional drilling and 2) drilling 4-6m by sliding then drilling 3-5m by composite method during angle building process. These findings can improve the pertinence and operability of BHA, and enhance the ratio of composite drilling footage.
Preparation and Gas Sensitivity of Two-Dimensional Tungsten Oxide Supported High Density Gold Nanoparticles
Authors: Hui Fei , Chen Yanhui , Zhou Quan , Wang Chunhui , Qi Meng , Li Wei , Yang Luyan , Li Ang
Published: August 2019

Nano-noble metal materials loaded metal oxide greatly reduce application costs, improve catalytic performance and sensing efficiency compared with oxide substrates. A simple and efficient load method plays an important role in promoting its commercialization. Nano-tungsten oxide is a kind of excellent gas sensing materials and it had been widely used. Noble metal loading can form abundant active centers on the surface of tungsten oxide and become an effective way to improve its gas detecting performance. The complexity and high cost of the loading methods hinder the its application and commercialization on supported catalysts. In this paper, Au/WO2.6 composites with high loading rate were prepared on layered tungsten oxide nano-flakes by a simple and low-cost method. The gas sensitivity of WO2.6 to ethanol and formaldehyde without Au and with Au were tested. The results show that the loading rate is the highest after reaction for 24 hours. The gas sensitivity of Au loaded WO2.6 is significantly improved. The sensitive mechanism on Au/WO2.6 composite were discussed in our work.
Properties and Performance of General Piezoelectric Materials on a Novel Cantilevered Energy Harvester
Authors: Gao Shan , Ao Hongrui , Jiang Hongyuan
Published: August 2019

Piezoelectric materials are held wide attention for they introduce a renewable and convenient method on vibration energy harvesting technology. Many kinds of piezoelectric materials are investigated in the past few years. Different properties of the materials are discussed on the influences of power output. In this paper, a novel harvester are proposed to research the performance of different general piezoelectric materials. With vertically staggered rectangle-though-holes (VS-RTH) combined with the cantilevered energy harvester, modal and harmonic response analyses are simulated to test the properties of the materials. For further experimental preparation, fabrication of the material layers are introduced in detail. In addition, the charges generation mechanism is shown in the aspects of piezoelectric effect, mode and polarization. The paper lists parameters for general piezoelectric materials properties. Besides, it provides the vibration performance under different piezoelectric materials condition. Therefore, it could benefit further applications and selections of energy harvesting materials.
Optimization of Bioleaching Process of High-Fluoride-Bearing Uranium by Response Surface Methodology
Authors: Li Xiang , Mo Xiaolan , Wen Jiankang , Yang Hongying
Published: August 2019

In the bioleaching system of high-fluorine uranium, the dissolution of fluorine must be considered, which is also affected by the parameters of the leaching process. In order to adapt the fluorine-containing system, the strain was domesticated under different fluoride level. In order to match the process parameters in the bioleaching of high-fluoride-bearing uranium ore, response surface methodology was used to predict the effective parameters and their interactions in bioleaching. Four significant variables ([Fe2+]initial, pH, solid-liquid ratio and inoculation percent) were selected for the optimization studies. The optimal values of the variables for the maximum uranium bioleaching recovery (94.230±0.74)% were as in agreement with the predicted models 94.41%.
Facile Preparation of Carbon Aerogels with Different Drying Methods
Authors: Xu Yuelong , Liu Zhenfa , Ren Bin , Wang Shasha , Zhang Lihui
Published: August 2019

Carbon aerogels were prepared through a polycondensation of phloroglucinol, resorcinol and formaldehyde with sodium carbonate as the catalyst under different drying methods. The drying methods were room temperature drying, vacuum drying and freeze drying. The effects of different drying methods on the porous structure of carbon aerogels were studied systematically. The texture and pore structure were investigated under scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and a surface-area analyzer. The results show that the freeze-drying method was good for the specific surface area of carbon aerogels, up to 843 m2 g–1.
Study on the Physical Properties of LiCl Solution
Authors: Song Ruiqi , Zou Tonghua , Chen Jianbo , Hou Xiaobing , Han Xiaowang
Published: August 2019

In the process of dehumidification of the solution, dehumidifier contacts with air directly to achieve the purpose of dehumidification, which is a very important part of air conditioning dehumidification system. Under different working conditions, the basic physical parameters of the liquid desiccant will change, which will have an important impact on the efficiency and performance of dehumidification. LiCl solution is widely used as a desiccant with many advantages such as high efficiency and safety. In this paper, the basic physical parameters of LiCl solution with high accuracy are summarized. Empirical formulas of saturation temperature, surface tension, density, dynamic viscosity, thermal conductivity, specific heat and dilution enthalpy of LiCl solution are summarized. The relationship between different physical properties and temperature, pressure and solution concentration is drawn. The corresponding data tables and graphs are drawn under different working conditions. This conclusion has developed a new idea for the research of desiccant solution, which provides a basis for follow-up research and in-depth research.
Synthesis of Graphene Hydrogel and Graphene Oxide/Polyaniline Composites for Asymmetric Supercapacitor
Authors: Shang Yangyang , Xu Liao , Cai Linlin , Jiang Xiaoqing
Published: August 2019

As a kind of new carbon materials, graphene has excellent performances such as superior conductivity, high specific surface area (2675 m2 g−1), and high cycle life. But graphene sheets are easily restacked by van der Waals interactions during the processes of preparation, storage, and application of them, which can loss ultrahigh specific surface area. The restacking of graphene sheets could be prevented by constructing graphene hydrogel (GH) or graphene composite. In this work, GH was prepared by a one-step hydrothermal synthesis reaction and glucose is used as a reducing agent, while graphene oxide/polyaniline (GP) composites was prepared by coating polyaniline on GO through in situ chemical polymerization of aniline. Then an asymmetric supercapacitor (GH//GP) was further assembled, where GH and GP are the positive and negative electrodes, respectively. The electrochemical properties of GH, GP, and GH//GP are studied using voltammetry and galvanostatic charge/discharge. The consequences indicate that the energy density of GH//GP reaches 5.6 W h kg−1 at power density of 226.5 W kg−1 and 3.1 W h kg−1 at energy density of 8446.2 W kg−1.
Development Trends of Energy Saving Technologies in Chinese Steel Industry
Authors: Wang Haifeng
Published: August 2019

Since the 21st century, the energy consumption per ton steel of Chinese key steel plants was reduced from 26.95GJ/t-s in 2000 to16.73GJ/t-s in 2017 by technical progress, such as coke dry quenching (CDQ), dry de-dusting of blast furnace gas (BFG) and converter gas (BOFG). In the future, developing interface technologies and building an industrial ecological chain connecting related industrial sectors and the society would be the development trends of energy saving technologies in Chinese steel industry.
Study on the Coupling and Coordination Relationship between Urbanization and Ecological Environment in the Yangtze River Economic Belt of China
Authors: Peng Shuolong , Jin Yuying
Published: August 2019

Based on the contradiction between urbanization and ecological environment in China’s Yangtze River Economic Belt, and the related researches are few, this paper uses the coupling coordination model to calculate the coupling degree of urbanization and ecological environment in China’s Yangtze River economy from 2010 to 2016, supplementing existing literature with new research objects and complete indicator system. It is found that the coordination degree between the two systems in the region keeps rising, and the value in the eastern region is greater than the value in the central and western regions.
Research Progress of Spatial Distribution about Geomorphologyl-Vegetation- Water Erosion Based on Remote Sensing in Soil Covered Pisha Stone Area
Authors: Shen Zhenzhou , Yao Wenyi , Xiao Peiqing , Li Mian , Zhang Pan , Yang Jishan , Chengran Jing , Liu Hui
Published: August 2019

The soil covered Pisha stone area is the core source area of the coarse sediment in the Yellow River, it has become the focal point of the ecological control of the Yellow River Basin. It has important value to study the spatial distribution about geomorphologyl-vegetation- water Erosion coupling in the soil covered Pisha stone area. Some valuable research results have been obtained by using high-definition remote sensing aerial photographs and unmanned aerial vehicle high precision data interpretation, Especially the image resolution obtained by unmanned remote sensing to obtain the spatial structure features of small watershed topographic features or vegetation structure characteristics. Use remote sensing to study the spatial distribution characteristics of soil erosion in the Pisha stone area slope and the regular response with time change on the geomorphic spatial structure of the slope is very important, the negative response relation between the spatial structure of the vegetation community and the energy dissipation impedance erosion need be study. It will be an urgent scientific problem to promote the research progress of soil erosion in pisha stone area, which will directly affect the theoretical foundation of the comprehensive treatment model of soil erosion in Pisha stone area.
Study on the Correlation between Hydration Heat and Electrical Resistivity of the Cement Pastes with Polycarboxylate Superplasticizer
Authors: Zheng Yunhao , Xiao Lianzhen
Published: August 2019

Resistivity development curves and hydration heat curves of the cement pastes with the superplasticizer dosages of 0, 0.1%, 0.3% and 0.5% were tested. It is found that the resistivity of the cement pastes decreases and the peak time of hydration exothermic rate was delayed with the increase of superplasticizer dosage. The relationship between the resistivity and the total amount of hydration heat was established. By measuring the resistivity, the total amount of hydration exothermic heat of the cement pastes can be effectively predicted based on the correlation.
Effect of Austenitizing Temperature on Divorced Eutectoid Transformation of GCr15 Steel
Authors: Han Dongxu , Du Linxiu , Zhang Bin , Dong Ying
Published: August 2019

The effects of holding temperature and holding time during the spheroidizing annealing on microstructure and mechanical properties of high-carbon chrome steel GCr15 were experimentally studied, especially the ripening process of carbides. The results showed that the spheroidization of carbides was accelerated by optimizing the spheroidizing annealing process. In the case of the same holding temperature, the amount of carbides increases first and then decrease with the increase of holding temperature. The best spheroidizing temperature was about 720°C. Under the conditions of various holding time, the size of carbides and the hardness decrease with the increase of holding time.