bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Cu/Si Additive on the Microstructure of Pyrolysis Carbon Derived from Phenolic Resin
Authors: Jiang Pengcheng , Wang Zhoufu , Wang Xitang , Liu Hao , Ma Yan
Published: November 2019

Phenolic resin has been widely applied as a carbonaceous binder in the field of carbon composites and carbon materials. The microstructure of pyrolysis carbon that derived from carbonaceous binders played an important role in the properties of carbon-containing refractories. In this study, the effects of copper and silicon on the pyrolysis behavior of phenolic resin and the microstructure of the pyrolysis carbon were investigated by using thermosetting phenolic resin as raw material, and using silicon powder (99%, 200 mesh) as well as copper nitrate (AR, w(Cu(NO3)2)⩾99%) as additives. The results showed that the copper nano-particles in-situ formed from copper nitrate could be served as catalyst in the pyrolysis process of resin. Catalytic synthesis of carbon nanofibers could improve the degree of carbonization with pyrolysis carbon microstructure at low temperature (below 800 °C). The carbon nanofibers had lamellar structure and layered stacking characteristic. Silicon carbide whiskers were produced by Cu-doping phenolic resin with copper and silicon at 1400 °C.
Research on the Thermal Insulation Performance of High Temperature Gradient Composite Insulation Material
Authors: Sun Xiankai , Zhang Shichao , Sun Haoran , Fang Kai , Yan Dachen , Chen Yufeng
Published: November 2019

In this study, the high temperature gradient composite insulation material (SGIM) was prepared by using zirconia fiber and carbon fiber (CZ), high temperature phase-change material (HPCM), microcellular thermal insulation material of calcium silicateas (CS/AS), insulation material of nano-silica(NP) and radiation shielding material as raw materials. The thermal insulation performance was simulated by using the finite element software. The heat insulation performance of the material was tested by oxy-acetylene ablation experiment. The thickness of the insulation material was also set to 32 mm. The temperature of hot surface was controlled at 2000°C. After 600 seconds, the material of cold temperature was 54°C. The excellent performance of SGIM insulation is demonstrated.
Uniaxial Tensile Properties of High Ductility Cementitious Composites with Sulphoaluminate Cement
Authors: Chen Bo , Guo Li-Ping , Ding Cong
Published: November 2019

This study evaluates the effect of sulphoaluminate cement content on the performance of high ductility cementitious composite (HDCC) as repair material. To prepare the HDCC, Portland cement was partially replaced with 10%, 15%, or 20% rapid hardening sulphoaluminate cement. The compressive and flexural strength developments and tensile properties of the sulphoaluminate cement containing HDCC were investigated. The microscopic mechanism by which sulphoaluminate cement affects the macroscopic performance of HDCC was examined by scanning electron microscopy. Before 14 d, the mechanical properties were directly proportional to the sulphoaluminate cement content, but at 28 d, the sulphoaluminate cement content exerted no obvious effect. The sulphoaluminate cement content largely influenced the ultimate tensile strain but little affected the tensile strength. The mechanical properties were optimized in HDCC containing 10% and 15% sulphoaluminate cement. The reduced tensile ductility in sulphoaluminate cement containing HDCC is attributed to the large amount of ettringite formed on the surfaces of the reinforcing PVA (polyvinyl alcohol) fibers.
Study on Energy Consumption Evaluation for Production of High-Titanium Slag
Authors: Gu Jing , Xia De Hong
Published: November 2019

High-titanium slag is not only the substitute for the gradually depleted natural rutile resources but also the important raw material for the clean production of titanium industry. In this paper, a modeling of energy consumption evaluation for production of high-titanium slag using the ilmenite as raw material was proposed, then the energy consumption of high-titanium slag production by direct reduction-melting and separation process (two-stage process) was measured on production site. The energy consumption of high-titanium slag was converted into standard coal energy or electric energy by the energy value method and the energy equivalent method, respectively, on the base of data collected from the plant. The electric energy consumption of high-titanium slag produced by the two-stage process was 1661.6 kWh per ton slag with the energy value method. Due to the energy value conversion method more reflects the value of electricity, which is suitable for applying to the energy consumption evaluation of high-titanium slag production.
Preparation and Characterization of Amino-Functionalized Geopolymer Microspheres
Authors: Chen M L , Ge Y Y , Xue G H , Xu M X , Cui X M
Published: November 2019

Geopolymer microspheres have the advantages of environmentally friendly, cost-effective, easily to synthesize and regenerate, which can be applied for adsorption of heavy metal ions from aqueous solution. In this study, the amino-functionalized metakaolin-based geopolymer microspheres (NH2-MGS) were synthesized by coupling agent method using N-βaminoethyl-γ-aminopropyltrimethoxysilane (AEAPTS). The influences of AEAPTS dosage and temperature on modification efficiency were investigated in detail, and the properties of NH2-MGS were characterized by SEM, EDS, BET, XRD and FTIR analysis. It is shown that amino groups were grafted onto the surface of geopolymer microspheres successfully, and the amount of amino groups grafted increased as the AEAPTS dosage further increasing to 15 wt% and the temperature to 70 °C. The BET specific surface area of NH2-MGS increased significantly from 23.78 to 63.78 m2/g with a corresponding increase of micropores and porosity, which have great potential as adsorbent for removal of heavy metal ions.
Photocatalysts Fabricated by Depositing Ag on Co-g-C3N4 and Its Enhanced Visible-Light Photocatalytic Performance
Authors: Zhou Zhiwei , Qiu Lingfang , Wang Jiahui , Pang Jiawen , Yang Fang , Yang Yuyu , Duo Shuwang
Published: November 2019

A novel photocatalyst, Ag/Co-g-C3N4, was synthesized by a simple photo-deposition method successfully to increase visible-light absorption efficiency and the separation rate of the photogenerated electron hole pairs. A series of characterization analysis were conducted including XRD, SEM, EDS, FT-IR, DRS and PL. The result of DRS shows that there was much visible-light absorption in Co-g-C3N4 compared with pristine g-C3N4. Cog-C3N4 and Co-g-C3N4 loaded with Ag showed a much lower photo-reduced carriers recombination rate according the data of PL. And the different contents of Ag were investigated in detail. The experiment of RhB visible-light degradation indicated the sequence of photocatalytic performances was: Ag/Co-g-C3N4> Co-g-C3N4> pure g-C3N4. The Ag/Co-gC3N4 in this work would be quite useful for removal of organic pollutants.
Construction of ZnO Hollow Spheres Coupled with g-C3N4 as Enhanced Photocatalysts under Simulated Solar Light
Authors: Zhang Xiaoxian , Si Ying , Li Ping , Duo Shuwang
Published: November 2019

Rapid photon-induced e−-h+ pairs recombination rate is a fatal factor restricting the photocatalytic performance of graphitic carbon nitride (g-C3N4). In this work, ZnO hollow spheres (ZnO HS) coupled with g-C3N4 photocatalysts were prepared by a simple mechanical agitation of the mixture of g-C3N4 and ZnO HS in ethanol solution. The as-prepared samples were systematically measured via were characterized by XRD, SEM, DRS, FT-IR and PL. As analysis from the PL test results, the g-C3N4/ZnO HS has much lower photo-generated e−-h+ pairs recombination rate than that of pure g-C3N4. Under the illumination of simulated solar light, the effect of ZnO HS concentration on the photocatalytic properties of as-prepared gC3N4/ZnO HS photocatalysts with different ZnO amount was discussed by the degradation of methyl orange (MO) in detail. The optimum photodegradation performance of g-C3N4/ZnO HS with 5% ZnO HS is almost 47.43% higher than that of pristine g-C3N4. Our research results present a simple and convenient synthetic protocol for processing g-C3N4-based photocatalysts for the degradation of environmental pollutants.
Enhanced Visible-Light-Induced Photocatalytic Performance of g-C3N4/ZnS/CuS Ternary Composite for Environmental Remediation
Authors: Si Ying , Zhang Xiaoxian , Li Ping , Duo Shuwang
Published: November 2019

The inherent drawback of high photo-induced electron-hole pair recombination rate restricts the photocatalytic performances of graphitic carbon nitride (g-C3N4).Here, in this work, g-C3N4/ZnS/CuS ternary nanocomposites with different CuS concentration were successfully fabricated by a hydrothermal process and subsequent followed by a cation exchange reaction. The as-synthesized samples were characterized by the techniques of XRD, SEM, DRS, FT-IR and PL. Characterization results show a much more efficient electron-hole pair separation rate of g-C3N4/ZnS/CuS, the g-C3N4/ZnS/CuS (8%) sample shows the best photocatalytic performance for degradation of Rhodamine B (RhB), which is about 1.6 times higher than that of g-C3N4/ZnS and 6.2 times higher than that of pure g-C3N4, respectively. The high photodegraded activity is attributed to the important role of ZnS and CuS acted as electron co-catalysts, which retard the fast recombination of photo-induced holes and electrons, resulting in higher photodegraded activity than pure g-C3N4.Our research work indicates that the heterostructured formation ofg-C3N4, ZnS and CuS is helpful for the fabrication of g-C3N4-based photocatalysts with enhanced visible light photoactivity.
High-Throughput Preparation and Properties Investigation of BNT Based Lead-Free Piezoelectric Ceramics
Authors: Song Guanhua , Liu Feng , Zhang Faqiang , Liu Zhifu , Li Yongxiang
Published: November 2019

A high-throughput (HT) bulk ceramic preparation process was applied to synthesize multi-compositional lead-free piezoelectric ceramics. The lead-free piezoelectric ceramic sample library with a chemical composition of 87Bi0.5Na0.5TiO3-6BaTiO3-7K0.5Na0.5NbO3(87BNT-6BT-7KNN) were prepared to confirm the validity of the HT preparation process. The XRD pattern and surface SEM images showed great consistency of the phase and morphology of the 16 samples in the library. The mean value of dielectric constant and piezoelectric coefficient wereεr= 1848 andd33= 14pC/N. Ferroelectric and strain properties also demonstrated a high consistency ofPs,Pr,Ecandd33*with the mean values of 25.9 μC/cm2, 3.6 μC/cm2, 0.64 kV/mm and 290 pm/V, respectively. The corresponding Coefficient of Variance (CV) values of all these parameters are quite low, which indicate that the HT method reported in this work is feasible in the discovering of new lead-free piezoelectric materials.
Study on the Fluidity Experiments of Engine Oil-Based Magnetic Fluid with Fe3O4/Ag Nanoparticles
Authors: Cao Qianhui , Zhang Zhili , Di Nannan , Zang Guobao , Li Decai
Published: November 2019

In this research, a new engine oil-based Fe3O4/Ag magnetic fluid is prepared applying the method of modified chemical co-precipitation. This preparation method is green without toxic gases being released. The nanoparticles are characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and vibration sample magnetometer (VSM). These characterizations demonstrate that the Fe3O4/Ag nanoparticles modified by oleic acid are successfully synthesized and uniformly dispersed in the engine oil. The hysteresis loop of this new magnetic fluid shows that it has no remnant magnetism and maintains superparamagnetic properties. Shear stress and viscosity of both Fe3O4magnetic fluid and Fe3O4/Ag magnetic fluid are measured by the rotational rheometer. The shear stress increases with the increasing shear rate while the viscosity decreases with the increasing shear rate. What’s more, the viscosity of Fe3O4/Ag magnetic fluid significantly increases compared with the traditional magnetic fluid.
A Facile Synthesis of A Novel Cu2Se@CMK-3 Nanocomposite for Rechargeable Sodium Batteries
Authors: Li Ying , Si Yuan , Li Li , Zhang Na , Cen Weihui , Wang Hongqiang , Dai Yejing
Published: November 2019

The rechargeable sodium-ion battery has become a research hotspot due to low cost and a large abundance of sodium resources. In this work, a novel nano-architecture of Cu2Se nanoparticles imbedded in ordered mesoporous carbon (Cu2Se@ CMK-3) was synthesized. Benefiting from the high conductivity and special nano-architecture of CMK-3 matrix, the as-synthesized Cu2Se@ CMK-3 composite delivers a high specific discharge capacity (231 mA h g−1) and superior cycling stability (a capacity decay of 0.33% per cycle during 100 cycles at 0.1 C) when used as cathode in sodium-ion batteries.
Preparation and Electrochemical Properties of Ba1-xLaxF2+x Fluoride Electrolyte
Authors: Cheng Xing , Wang Shu , Lin Xuping
Published: November 2019

A series of Ba1-x
La
x
F2+x
composition powders with different values of x were prepared by water and ethanol mixed solvent method. The effects of different values of x on the phase composition, crystal structure and electrochemical properties of Ba1-x
La
x
F2+x
electrolyte were studied. The electrical conductivity of Ba1-x
La
x
F2+x
at different temperatures was investigated by electrochemical impedance spectroscopy. The results of transmission electron microscopy showed that the prepared Ba1-x
La
x
F2+x
powders ranged in size from 10 to 25nm and dominated by crystalline phases. XRD results show that the Ba1-x
La
x
F2+x
electrolyte gradually changes from fluorite structure to tysonite structure with the increase of x value. Electrochemical impedance spectroscopy was used to study the electrical properties at 25, 50, 75, and 100°C. It was found that the ionic conductivity of the Ba1-x
La
x
F2+x
electrolyte at the same temperature increased with the increase of temperature. When x is small, the main carrier of Ba1-x
La
x
F2+x
electrolyte is F−. When x is too large, it mainly depends on F−vacancy conduction, while the conductivity of the former is lower at lower test temperature. The contribution is much larger than the latter, which is also the main reason for the decrease of conductivity of Ba1-x
La
x
F2+x
electrolyte when x is too large. At the same temperature, Ba0.6La0.4F2.4 is always the maximum conductivity.
The Study of Atmospheric Pressure CVD Growth Process of MoxW1-xTe2 Nanobelts for Tuneable Chemical Composition
Authors: Liu Shijian , Qiu Haipeng , Liu Shanhua , Zou Jin , Chen Zhigang
Published: November 2019

Transition metal dichalcogenides nanomaterials with topological semimetallic phase (MoTe2, WTe2 and MoxW1-xTe2) are expected to realize no-consumption electronic transportation due to its Dirac point. Especially, the various structure existence in MoxW1-xTe2, like hexagonal (2H), monoclinic (1T’) and othorombic (Td), provides opportunities for phase engineering, which is beneficial for future novel electronic and spintronic devices. Plenty works have focused on the synthesis of MoTe2, WTe2 and MoxW1-xTe2 nanomaterials. Unfortunately, the understanding of the growth process of MoxW1-xTe2 nanomaterials is still absent and the exact control of the atomic ratio between Mo and W in MoxW1-xTe2 nanomaterials is still a huge task up to now. Here, we study the growth process of MoxW1-xTe2 nanomaterials by the growing of binary MoTe2 and WTe2 nanomaterials. Through detailed structural and compositional characterization, same growth mode, crystallography, and morphology have been observed among MoTe2, WTe2 and MoxW1-xTe2 nanomaterials. Through analysis, we suggest that the heating temperature of Mo and W precursors during the CVD process is the key parameters to achieve the tuneable chemical composition of MoxW1-xTe2 nanomaterials. This study dissected the growth process of MoxW1-xTe2 nanomaterials and provided a possible method to control the chemical composition of MoxW1-xTe2 nanomaterials by APCVD, which is beneficial to realize the phase engineering in Mo-W-Te system and also for future topological application.
A Green Route to Prepare Semitransparent Superhydrophobic-Oleophobic Coatings
Authors: He Sizhe , He Xiaoyong , Cheng Xuan , Huang Liuying
Published: November 2019

A series of coating samples were prepared with various combinations of solvents being tested via a two-step dip-coating route. The surface hydrophobicity was studied by measuring water and oil contact angles. Furthermore, the surface topography, optical and abrasive properties of the selected 4 coating samples were examined by atomic force microscopy (AFM), ultraviolet-visible spectrophotometer and friction cycle test, respectively. The best overall properties were achieved with the coating sample prepared by nontoxic epoxy resin-ethanol (Step 1) and isopropanol (Step 2). The water and oil contact angles reached 152.0° and 112.7°, respectively, and water contact angle remained 150.2° upon 5 cycles of the friction test with sandpaper. The transmittance of 80% was obtained in the wavelength ranging from 400 to 800 nm.
Design and Preparation of Wave-Transmitting Reinforcing Coatings for Multifunctional Ceramic Composite Antenna Windows
Authors: Sun Chenggong , Zhang Qingli , Zhang Xunhu , Xing Zhengpeng , Wang Yanyan , Cheng Honghao , Jiang Liping
Published: November 2019

For obtaining multifunctional ceramic composite antenna windows with integrated function including low density, wave-transmission and thermal insulation, the design and preparation of reinforcing coatings on ceramic matrix was discussed in detail in this work. With quartz glass chopped fiber as the major constituent for matrix, borosilicate glass was selected as the main phase for reinforcing coatings, and functional filler was added to match the coefficient of thermal expansion between the two components. According to the performance testing of the as-prepared samples, content of B2O3 in SiO2/B2O3 binary system and sintering temperature showed a marked impact on the microstructure, density and thermal behaviour of the ceramics. Densified coatings were prepared at 1160°C after sintering for 1h with 20% B2O3 in borosilicate glass, which bond well with the substrate and have radiation coefficient of 0.85 and linear expansion coefficient of (1.77∼2.39)×10-6/°C (200∼1000°C). Stronger matrix, better ablation resistance and dielectric properties are expected to be integrated in the obtained sample pieces, which can be a good candidate as effective thermal insulation materials for aerospace aircrafts at high flight Ma.
Application of Non-mold Casting Technology in the Tractor Diesel Engine Cylinder Block
Authors: Xing-hai Shao , Feng-jun LI , Xu Hai-duo , Qi AN , Xiang Ling-fang , Feng Zhi-ming , Le-hua LV
Published: November 2019

This paper researched the application of non-mold casting technology for reducing the development cycle and cost of tractor diesel engine cylinder body. The detail of the each process method has explained which based on the non-mold casting process of a diesel engine cylinder block. The results showed that rapid casting of diesel engine cylinder block can be realized by the non-mold casting composite forming technology, combined with CAD/CAE technology and virtual reality technology. The advantages of this method have fast speed, low cost, green, and lightweight, that is to say, piece manufacturing cycle was shortened by more than 50%, single piece manufacturing cost was reduced by more than 81%, and 8-9 molds were saved.
Experimental and Numerical Studies of Ice Accretion on Atmospheric Icing Laboratory at Different Icing Pattern and Time
Authors: Zhao Chen , Liu Panfeng , Wang Haijiang
Published: November 2019

The purpose of this paper was to explore a suitable icing test method which can achieve the requirement of the experimental conditions better and faster in atmospheric Icing Laboratory. So, the effects of varying the spray method and spray time of different conditions were studied in experiment. The ice shape and profile of ice accretion obtained in atmospheric icing laboratory were investigated with variable air temperature. The icing object was exposed to the one aerosol cloud------freezing rain. In addition, the heat balance model of dynamic process of single droplet would be set up, the experimental condition of distance between nozzles and icing object was analysed by simulation calculation for the model. At the same time, appears the effects of different distances on the mass, ice shape and ice accreted of profile under different conditions in experiment.
Research on Braking Vibration Characteristics of Grooved Brake Interface of Disc Brake
Authors: Sha Zhihua , Kang Panli , Yin Jian , Liu Yu , Zhang Shengfang , Ma Fujian , Yang Dapeng
Published: November 2019

With the good performance and wide application of surface texture in various aspects, more and more scholars are devoted to investigating the effect of texture interface on tribological properties. Disc brake friction pair is a typical friction brake interface. In order to consider the influence of grooved brake interface on vibration characteristics during braking, a simplified finite element model of brake interface is established in this paper. By processing parameterized grooves with different lengths and angles on the surface of the brake disc, the effects of “blind groove”, “through groove” and “angle” on the vibration characteristics of the brake disc during braking process are simulated and studied, which can provide reference for the structural design and optimization of the brake disc texture.
Comparative Analysis of Power Plants Using Low Potential Heat of Liquefied Natural Gas (LNG)
Authors: Dmitry Uglanov , Evgeny Blagin , Roman Panshin , Olga Tereshchenko , Vladimir Biryuk
Published: November 2019

The idea of using low-potential energy of cryogenic liquids has recently become more widespread. This is primarily due to the increasing production of cryogenic substances, as well as the general trend of energy saving and the energy potential existing in the cryoproduct in the form of energy previously used for its liquefaction.

Low-potential energy is the energy of a colder environment, having the same pressure as the consumer’s energy converter. Currently, one of the most frequently used cryogenic substances is liquefied natural gas (LNG), and methods of regasification and use continue to improve.

This paper proposes a method for a comparative analysis of the use of liquefied natural gas as a working fluid, a study of the efficiency of the regasification process. The main parameters of energy installations were calculated and the main advantages and disadvantages were identified on the basis of the results, and the most optimal one was selected.
Simulation Study on Gap Flow Field in EDM Micro-hole Machining Based on Gas-liquid-solid Three-phase Flow
Authors: Liu Yu , Liu Chuangye , Zhang Wenchao , Zhang Shengfang , Ma Fujian , Yang Dapeng , Sha Zhihua
Published: November 2019

In the process of micro-hole machining in EDM, if the debris and bubbles are not removed from the gap flow field, the concentration of debris and bubbles will increase, which will cause arcing discharge and seriously affect the processing efficiency and surface quality. In this paper, the geometric model of three-dimensional cylindrical gap flow field was established. The influence of bubble generation on the gap flow field and the debris under single pulse discharge condition was analyzed by Fluent. Then using the secondary development function of Fluent, the process of the debris and bubble on the bottom surface is continuously generated and the influence of bubble on the movement of debris under continuous discharge conditions were simulated and analyzed. Finally, by considering side flushing, the motion process of bubbles and debris under the conditions of flushing was analyzed.
Reconstruction on Rotor Profile of Twin Screw Compressor Based on Cubic B-spline Curve
Authors: Chen Yinglei , Ge Rongyu , Kong Beibei , Ni Xiaomei
Published: November 2019

In order to overcome the inconvenience of adjusting the rotor profile of twin screw compressor, the method of using cubic B-spline curve to express the rotor profile is put forward. CFD simulation analysis of the rotor compressor formed by the modified cubic B-spline curve shows that the performance of the rotor profile described by the cubic B-spline curve has little difference with that of the original profile line, and the rotor profile described by cubic B-spline curve is more convenient to modify.
Sliding Bearing Material Testing Machine under High Temperature Corrosion Conditions
Authors: Jiang Wenxun , Wang Wen
Published: November 2019

Sliding bearings are widely used in submerged rolls of strip galvanizing line immersed in zinc bath. Submerged roller bearing pair materials include sleeves and bushings. These two parts are in high temperature, load and corrosive working environment. They are prone to wear and failure. The service life of bearing pair materials determines the operation time of the whole galvanizing line. In order to ensure long-term operation of galvanizing line, the most ideal method at present is to select suitable sleeve and bushing material matching pairs. To screen sleeve and bushing materials with good matching performance, a friction and wear tester simulating sleeve and bushing materials in high temperature molten zinc environment was designed and developed. The test machine is divided into three parts: driving system, loading system and heating system. The driving system drives the sample rotation of the sleeve; the loading system drives the bushing pattern to load the sample of the sleeve; the well heating furnace heats the zinc ingot to 480 °C to simulate the zinc pool environment; the vertical loading of bearing pattern and sleeve pattern, the alignment and insulation of the driving system and the loading system are comprehensively considered and solved. The stability of the test machine under test conditions is analyzed to ensure that the signal collected by the sensor has a high reference value.
A Novel Reference Model-Based Neural Network Approach to Temperature Control System
Authors: Xu Song , Hashimoto Seiji , Jiang Wei
Published: November 2019

With the continuous development of deep learning, neural network with its excellent self-learning performance obtains a series of a major breakthrough in target detection, image recognition and so on. In this paper, the temperature control system based on a neural network combined with I-PD compensation is proposed. To improve the neural network self-learning efficiency, the reference model is introduced for providing the teaching signal of neural network. The system simulations are carried out in MATLAB/SIMULINK environment to verify the control efficiency of the proposed reference model based neural network control system. The experiments are carried out on the DSP based temperature control system platform, the results are compared to the conventional I-PD control system to verify the control efficiency.
Hybrid Non-Local Network for Abstractive Summarization
Authors: Hao Zepeng , Guo Yupu , Gong Cheng , Chen Honghui
Published: November 2019

In the field of abstractive automatic summarization, the Seq2Seq model constructed by the RNN network is widely used and has achieved perfect results. However, due to the Seq2Seq model and the internal structure of the RNN network, only short-term and local information can be referenced in the process of generating summary, resulting the generated summary contains less information, and may even happen that the generated summary does not match the corresponding document. There have been many previous attempts to improve the model by using the attention mechanism, but only to use long-term information within a certain range. In our paper, we present a abstractive summarization model that enhances the global feature, which called Hybrid Non-Local Network model for single document summarization task, consisting of a non-local block and a traditional Seq2Seq module. Our model uses the non-local network block to transform the Seq2Seq model to better capture global feature. For example, the relationship between words and words, sentences and sentences in a large span of the original document, making the generated summary of higher quality, more informative, more accurate and rich representation of the original document. The experiments in our paper are performed on the CNN/DailyMail corpus. The proposed model was improved by 1.37, 0.47, and 1.16 onR-1 score, R-2 score, andR-L score, separately, compared to the baseline model.
Study on Vessel Maintenance Support System Modelling Based on DODAF
Authors: Chaowei Wang , Lvhui Ding , Qian Wu , Jie Zhang , Peichang Li
Published: November 2019

The vessel maintenance support system, which consist of aboard and onboard two parts, is different from the other equipments, with the characteristics of tasks varied, complex structures and onerous business. It is a virtual system rather than a material system. So the traditional modelling method which is used to describe the material objects has some defects of long communication period, weak reusability and poor expansion in describing support system in design process, which apparently cannot meet the current demands. It is imperative to introducing standardized design and modelling approach to establish the vessel support system. The study firstly analyses the function, organization, resource and operation of vessel support system. The support system modelling method is introduced based on the analysis of different view products in DODAF framework. The support system model, which is consists of organization model, activity model and information exchange matrix is given based on active based model. It can provide guidance in support system design, support concept generation under new situation, even in integrated joint operation system design in the future.
Study on Evaluation Model of Equipment Transportation Efficiency Based on Analytic Hierarchy Process
Authors: Qian Wu , Chaowei Wang , Fei Pei , Yingcheng Xu , Xiaowei Lu
Published: November 2019

On the basis of factors influencing the evaluation of equipment transportation efficiency, such as safety, timeliness, universality and economy of system analysis, and in combination with the basic theory of Analytic Hierarchy Process (AHP), this paper sorted out the main steps for evaluation of equipment transportation efficiency, established the hierarchical chart for evaluation index of equipment transportation efficiency, proposed a comprehensive evaluation model of equipment transportation efficiency based on AHP, and verified the feasibility of this model through the specific cases. The comprehensive evaluation model of equipment transportation efficiency based on AHP proposed by this paper provides a method for the decision makers to select the optimal design scheme for equipment transportability, and lays a foundation for related studies of equipment transportability.
The influence of seasonal changes on the formation of colloids and thin films of iron(III) hydroxide in Ob floodplain lakes
Authors: Lyutova E , Borilo L , Izosimova E , Kolesnichenko L , Rozhkova-Timina I , Spivakova L
Published: November 2019

The research was conducted in the middle Ob floodplain. Several parameters (dissolved CO2, pH, conductivity, temperature, humin substances, Fe) were measured in six floodplain lakes in summer and autumn periods 2018. Temperature, conductivity and dissolved CO2 demonstrated the significant difference between these two samples.
Obtained Heteromodulus Composites Based on Zirconium Carbide
Authors: Mirovoy Yu A , Burlachenko A G , Buyakova S P , Kulkov S N
Published: November 2019

The article is devoted to the impact of carbon additives on densification and mechanical properties of ZrC/C heteromodulus composites. In case of addition of small amount of carbon to ZrC residual porosity decreases, whereas higher carbon content leads to more than 3vol.% increase in residual porosity. Moreover, increase in carbon content in ZrC/C composites boosts toughness of sintered materials. For example, К
IC
=4.3 MPa×m1/2 for ZrC and К
IC
=7 MPa×m1/2. for 3 vol.% C. For 15 vol.% of C, toughness is the lowest and equals 5.3 MPa×m1/2. The extrapolation of the dependence of toughness on the non-porous state of materials is К
IC0
=13.2 MPa×m1/2.
Methods for describing structure of novel porous materials: a review
Authors: Smolin A Yu , Eremina G M , Korostelev S Yu
Published: November 2019

The physical and mechanical properties of heterogeneous materials are mainly determined by their structure. Due to the wide capabilities of modern technologies for the formation of complex multilevel pore structure of ceramics and other materials, the ability of modern methods to describe and characterize such a structure completely is of particular interest. Traditionally, the pore structure is characterized by a large number of parameters such as porosity, type and shape of pores, the fraction of cross-sectional area of channels, pore size distribution, etc. However, recently, at least three new quantities are often used to describe and measure the structure of various complex media: the Minkowski functionals, fabric tensors, and correlation functions. This review is aimed to consider all these three approaches and their capabilities for describing and measuring the peculiarities of the structure of porous materials.
Investigations of the stress-strain state of a compressed steel concrete column using digital image correlation method
Authors: Plyaskin A S , Klopotov A A , Potekaev A I , Koshko B O , Ustinov A M , Volokitin O G , Kurzina I.A. , Tayukin G I
Published: November 2019

The results of the investigation of deformation during axial compression of a steel-concrete round column with dimensions of 1000×102 mm on the testing machine Universal Testing Machine 4500 using a digital optical system Vic-3D are presented. The patterns of the evolution of strain field distributions on the surface of the steel shell of the column are obtained. A deformation diagram indicating the transition stages of elastic strains to inelastic ones is constructed. A jump-like dependence of the Poisson’s ratio on the longitudinal relative strain of the steel concrete column during deformation of the steel concrete column is established. This phenomenon is explained under the assumption that the deformation process involves redistribution of the forces (deformations) among the components of the composite system at the stage of joint operation before separation of the steel/concrete media and operation of concrete beyond elastic strain under conditions of volumetric compression.
Field theory of monochromatic optical beams: II. Classical and quantum paraxial fields
Authors: Aiello Andrea
Published: November 2019

This work is the second part of an investigation aiming at the study of optical wave equations from a field-theoretic point of view. Here, we study classical and quantum aspects of scalar fields satisfying the paraxial wave equation. First, we determine conservation laws for energy, linear and angular momentum of paraxial fields in a classical context. Then, we proceed with the quantization of the field. Finally, we compare our result with the traditional ones.
Model-based design of areal material measures with component surfaces
Authors: Eifler M , Klauer K , Seewig J , Kirsch B , Aurich J C
Published: November 2019

The calibration and verification of areal surface topography measuring instruments is usually performed with artificial geometries that do not correspond to a practical measuring task like gratings or step height artefacts (ISO 25178-70:2014). While these processes have a sufficient process capability to meet the requirements of many industrial measurement applications, there are more and more applications that require small tolerances, which results in the necessity of a performance verification that is more closely related to the later performed measuring task. With a model-based design approach it is possible to design material measures based on component surfaces for an application-oriented performance verification. The initial point is a measured dataset, which is evaluated and virtually transformed in a way that on the one hand the target properties are met, but on the other hand also the functional properties of the surface that are relevant for the specific application are preserved. Based on the subsequent application of virtual manufacturing and measuring processes, also impacts from these processes can be considered in the design of the verification sample. In this study, we extend the basic approach that has been developed for the design of profile material measures e.g. with the manufacturing principle of ultra-precision turning (Seewig, Eifler, Schneider, Aurich Proc. CIRP
45 (2016), 259-262; Eifler, Schneider, Seewig, Kirsch, Aurich Eng. Sci. Technol.
4 (2016) 1993-2001. Seewig, Eifler, Schneider, Kirsch, Aurich Surf. Topog.: Met. Prop.
4 (2016) 024010. Eifler (2016)). to areal material measures and a corresponding manufacturing principle of micro-milling. With the model-based design approach, component surfaces are used to determine two different material measures that feature defined values of the surface texture parameters Sa, Sq, Sk, Svk, Spk as a case study. It will be shown that the areal surface texture parameters can be mapped to the designed material measures that enable a practical performance verification.
High field phase transition of cathode material Li2MnSiO4 for lithium-ion battery
Authors: Yang Feng , Xia Zhengcai , Huang Sha , Zhang Xiaoxing , Song Yujie , Xiao Guiling , Shao Gangqin , Liu Yong , Deng Han , Jiang Dequan , Ouyang Zhongwen
Published: November 2019

The magnetic properties of the candidate lithium-ion battery cathode materials Li2MnSiO4 have been studied experimentally using static and pulsed high magnetic fields. A field-induced magnetic transition is observed in low temperature region, in which a saturation magnetization is observed above 27 T which confirms that the Mn-ion has a dominant low spin state with a saturated magnetic moment of ∼3.1 μ
B/Mn. With the change of temperature and magnetic field, the Li2MnSiO4 shows a complex magnetic phase transition. Considering to the coupling between spin, charge and orbital, the field-induced magnetic transition may affect the charge-discharge behavior of the cathode material, thus, the study is expected to explore the possibility and stability of the candidate lithium-ion battery cathode materials used in the low temperature and high magnetic field circumstance and its performance degradation.
Structure, morphology and luminescence properties of sol-gel method synthesized pure and Ag-doped ZnO nanoparticles
Authors: Chitradevi Thangaraju , Jestin Lenus A , Victor Jaya N
Published: November 2019

Highly Crystalline pure and Ag-doped ZnO nanoparticles were prepared using the inexpensive sol-gel synthesis method with the stimulation of transition metal ion surfactant. The prepared pure and Ag-doped (Silver doped) ZnO nanoparticles were characterised by various sophisticated techniques like x-ray Diffraction (XRD), Scanning Electron Microscope (SEM), Dynamic Light scattering (DLS), Fourier Transform Infrared Spectroscopy (FTIR), UV–visible absorption, Photoluminescence (PL) and Zeta potential. The result indicates that the average grain size of the prepared nanoparticles was found to be a minuscule 24 nm with a commendable bandgap of 3.21 eV and 1.73 eV respectively. The hexagonal wurzite structures of pure and Ag-doped ZnO at room temperature confirmed the luminescence characteristics of the nanoparticles.
Experimental and computational studies of imidazolium based ionic liquid 1-methyl- 3-propylimidazolium iodide on mild steel corrosion in acidic solution
Authors: Parveen Gulista , Bashir Sumayah , Thakur Abhinay , Saha Sourav Kr , Banerjee Priyabrata , Kumar Ashish
Published: November 2019

Corrosion inhibitive property of ionic liquid 1-Methyl-3-propylimidazolium iodide (MPII) on Mild Steel in 1 M H2SO4was investigated by experimental and computational Studies. The inhibition efficiency of inhibitor MPII at various concentrations, temperature and time duration were studied by gravimetric measurements, potentiodynamic polarization techniques, electrochemical impedance spectroscopy (EIS), surface studies and computational studies. The results from potentiodynamic polarization studies revealed that inhibitor 1-Methyl- 3-propylimidazolium iodide acts as a mixed type inhibitor with a high inhibition efficiency of 91% at 298 K. Adsorption of the inhibitor on the surface of mild steel follows the Langmuir adsorption isotherm. The mechanism of adsorption was also validated by quantum chemical studies. Morphology and topography of the Mild Steel surface with and without the inhibitor were investigated by SEM. Thermodynamic parameters for adsorption like adsorption equilibrium (Kads),ΔHads,ΔSads,Free energy of adsorption i.e. ΔGadswere also calculated so as to project the mechanism of adsorption. Computational data obtained from the Density functional theory (DFT) were used to acquire detailed theoretical insights. Appreciably Electrochemical impedance spectroscopy, Molecular dynamic simulation and quantum chemical calculation confirms the interaction of inhibitor with metal which leads to increases in inhibition efficiency.
Synthesis, luminescence and energy transfer of Ca3GdNa(PO4)3F: Ce3+, Tb3+ phosphor with novel apatite structure
Authors: Xie Lin-Yan , Zhuo Ning-Ze , Zhang Na , Du Wen-Hui , Zhu Yue-Hua , Cheng Shao-Wen , Wang Hai-Bo
Published: November 2019

A series of Ce3+/Tb3+ singly doped and Ce3+, Tb3+ co-doped Ca3GdNa(PO4)3F phosphors were synthesized via high temperature solid-state reaction in a reductive atmosphere. The crystal, luminescence properties, energy transfer mechanism and thermal stability of the samples were investigated in detail. The Ce3+ doped phosphors can be excited in the range from 250 to 330 nm. The Ce3+,Tb3+ co-doped phosphors exhibit characteristic emission of Ce3+ and Tb3+ simultaneously under the excitation of 301 nm. In addition, the energy transfer efficiency from Ce3+ to Tb3+ reaches as high as 78.6% when the doping amount of Tb3+ is 0.20. The mechanism of energy transfer between Ce3+ and Tb3+ ions is demonstrated to be a dipole−dipole interaction. The luminescence characteristics show that this phosphor can be a platform for modeling a new phosphor and application in the solid-state lighting field.
Evolution of the radius of spatial analyticity for the periodic BBM equation
Authors: Himonas A. , Petronilho Gerson
Published: November 2019

The Cauchy problem of the Benjamin-Bona-Mahony (BBM) equation with initial data

u
0

u_0

that are analytic on the torus and have uniform radius of analyticity

r
0

r_0

is considered, and the evolution of the radius of spatial analyticity

r
(
t
)

r(t)

of the solution

u
(
t
)

u(t)

at any future time

t
t

is examined. It is shown that the size of the radius of spatial analyticity persists for some time and after that it evolves in a such a way that its size at any time

t
t

is bounded below by

c

t

−
1

c t^{-1}

for some

c
>
0

c>0

. The optimality of this bound remains an open question.
Regularity of 𝑅(𝑋) does not pass to finite unions
Authors: Feinstein J.
Published: November 2019

We show that there are compact plane sets

X
X

,

Y
Y

such that

R
(
X
)

R(X)

and

R
(
Y
)

R(Y)

are regular but

R
(
X
∪
Y
)

R(X \cup Y)

is not regular.
On the Helicity conservation for the incompressible Euler equations
Authors: De Rosa Luigi
Published: November 2019

In this work we investigate the helicity regularity for weak solutions of the incompressible Euler equations. To prove regularity and conservation of the helicity we will treat the velocity

u
u

and its

curl
⁡
u

\operatorname {curl} u

as two independent functions and we mainly show that the helicity is a constant of motion assuming

u
∈

L
t

2
r

(

C
x
θ

)

u \in L^{2r}_t(C^\theta _x)

and

curl
⁡
u
∈

L
t

κ

(

W
x

α
,
1

)

\operatorname {curl} u \in L^{\kappa }_t(W^{\alpha ,1}_x)

, where

r
,
κ

r,\kappa

are conjugate Hölder exponents and

2
θ
+
α
≥
1

2\theta +\alpha \geq 1

. Using the same techniques we also show that the helicity has a suitable Hölder regularity even in the range where it is not necessarily constant.
Relationship of amyloid-β1–42 in blood and brain amyloid: Ginkgo Evaluation of Memory Study
Authors: Lopez Oscar L , Klunk William E , Mathis Chester A , Snitz Beth E , Chang Yuefang , Tracy Russell P , Kuller Lewis H
Published: November 2019

A blood test that predicts the extent of amyloid plaques in the brain and risk of Alzheimer’s disease would have important benefits for the early identification of higher risk of dementia and Alzheimer’s disease and the evaluation of new preventative therapies. The goal of this study was to determine whether plasma levels of amyloid-β1–42, 1–40 and the amyloid-β1–42/1–40 ratio among participants in the Pittsburgh centre of the Ginkgo Evaluation of Memory Study were related to the extent of brain fibrillar amyloid plaques measured in 2009 using Pittsburgh compound-B PET imaging, hippocampal volume, cortical thickness in the temporal lobe and white matter lesions. There were 194 participants who had Pittsburgh compound-B measurements in 2009 with the mean age of 85 years; 96% were white and 60% men. Pittsburgh compound-B positivity was defined as a standardized uptake value ratio of ≥1.57. Amyloid-β in blood was measured using a sandwich enzyme-linked immunosorbent assay developed by Eli Lilly and modified at the University of Vermont. All participants were nondemented as of 2008 at the time of study close out. The study sample included 160 with blood samples drawn in 2000–02 and 133 from 2009 and also had brain amyloid measured in 2009. All blood samples were analysed at the same time in 2009. Plasma amyloid-β1–42 was inversely related to the percent Pittsburgh compound-B positive (standardized uptake value ratio ≥1.57), β −0.04, P = 0.005. Practically all participants who were apolipoprotein-E4 positive at older ages were also Pittsburgh compound-B positive for fibrillar amyloid. Among apolipoprotein-E4-negative participants, quartiles of amyloid-β1–42 were inversely related to Pittsburgh compound-B positivity. In multiple regression models, plasma amyloid-β1–42 measured in 2000–02 or 2009 were significantly and inversely related to Pittsburgh compound-B positivity as was the amyloid-β1–42/1–40 ratio. There was a 4-fold increase in the odds ratio for the presence of Pittsburgh compound-B positivity in the brain in 2009 for the first quartile of amyloid-β1–42 as compared with the fourth quartile in the multiple logistic model. This is one of the first longitudinal studies to evaluate the relationship between amyloid-β1–42 in the blood and the extent of brain amyloid deposition measured by PET imaging using Pittsburgh compound-B. Our findings showed that remote and recent low plasma amyloid-β1–42 levels were inversely associated with brain amyloid deposition in cognitively normal individuals. However, changes in plasma amyloid-β1–42 over time (8 years) were small and not related to the amount of Pittsburgh compound-B.
Firms’ Price, Cost and Activity Expectations: Evidence from Micro Data
Authors: Boneva Lena , Cloyne James , Weale Martin , Wieladek Tomasz
Published: November 2019

Firms’ expectations play a central role in modern macroeconomic models, but little is known empirically about them. Using panel data on manufacturing firms’ expectations about prices and wage rates, new orders, employment and unit costs for the United Kingdom, we document a range of stylised facts about firms’ expectations and their determinants. There is wide dispersion of expectations across firms. Firms' expectations are influenced by both firm-specific factors and macroeconomic factors. We find a significant connection between past expected price and wage increases and their out-turns. Firms’ expectations are, however, clearly not rational.