bluuebunny/crossref_metadata_2025_split huggingface dataset:
Elastic Modulus Prediction of Particle Reinforced Composites Based on Sphere Model
Authors: Li Yanru , Jiang Haibo 
Published: January 2020

Abstract
The elastic modulus calculation of particle-reinforced composites is a classic but rather complex issue. By adopting analytic method, this paper is intended to seek solutions and calculations with the help of the symbolic integral operation function of the software Mathematica to derive the analytical expressions of the elastic modulus of particle-reinforced composites. Study shows that the representative volume unit of particle-reinforced composites may be expressed with spherical model. Two calculation methods which feature “first parallel and then serial” and “first serial and then parallel” respectively deliver two slightly different elastic modulus values, and the intermediate value may be deemed as the predicted elastic
Simulation of Giesekus fluid flow in extruder using helical coordinate system
Authors: Vachagina E K , Kadyirov A I , Karaeva J V 
Published: January 2020

Abstract
In the present work, it is proposed to use a helical coordinate system for mathematical modeling of non-isothermal Giesekus fluid flow in the extruder in the metric zone. The convenience of using a helical coordinate system is to reduce the three-dimensional problem to two-dimensional without the use of additional assumptions. The helical coordinate system is applicable only for steady flow conditions. Particular results of the numerical implementation of the use of a helical coordinate system are presented on the example of a Giesekus fluid flow in an extruder with a single flight, the results are compared with the flow of Newtonian fluid.
Temperature effect on the Production of Highly charged Fe Ion beams at 14.5 GHz ECR Ion source
Authors: Liu H. P. , Li J.Y. , Kang L. , Zhang T. M. , Li J. 
Published: January 2020

Abstract
Temperature is one of the important parameters that effect the production of metal ion using MIVOC method. Beams of highly charged iron ions are produced with 14.5 GHz all-permanent-magnet electron cyclotron resonance ion source at three temperatures at 320 kV high voltage multi-discipline platforms for highly charged ions at IMP, CAS. At 18 °C, Fe13+ and Fe15+ of more than 15.9 eμA and 11.7 eμA have been extracted with an extraction voltage of 15 kV and a microwave power of 300 W. When increasing temperature to 25 #x00B0;C and 30 #x00B0;C, more main substance arrives at the plasma chamber of ion source and the outputs of Fe15+ and Fe16+ decreases, but those of Fe13+, Fe12+ and Fe11+ increase, the distribution of Fe ions shifts towards low charge state. The conductance of the coupled MIVOC system is estimated at different temperatures. The ionization efficiencies and the effective consumptions rate of ferrocene are also figured out from the vapour pressure and the intensities of iron ion beams. With the increase of the temperature, the conductance and the consumptions increases while the dependence of ionization efficiency on the temperature is different.
Colorless, heat resistant polyimide films derived from 2,3,3′,4′-biphenyltetracarboxylic dianhydride
Authors: Song G , Chen C 
Published: January 2020

Abstract
The development of high performance colorless polyimide (PI) films is one of the targets of PI chemistry, since heat resistant colorless PI films are key materials for reliable plastic substrates in image display devices. In the present work, 2,3,3′,4′-biphenyltetracarboxylic dianhydride (a-BPDA) was used to polymerize with diamines to afford a series of PI, as shown in Scheme 1. Due to the fully aromatic composition, the films displayed high thermal decomposition temperatures (T5%). PI-FDA and PI-FFDA had similar glass transition temperatures (Tg) around 425°C, and much higher than that of PI-TFMB. PI-TFMB and PI-FFDA showed a transparent and colorless feature, with high transparency at 400nm (T400). Coefficients of thermal expansion (CTE) were found around 55ppm.°C−1 for the series of PI films, larger than the requirement of flexible substrate applications, which could be attributed to the distorted chain structure derived from the a-BPDA component.
Preparation and luminescence of rare earth complex Eu(DBM)3(TPPO)
Authors: Li Q Y , Tang P S , Shen W B , Zhou Y F , Niu Z R , Wang Y L , Ding Y B 
Published: January 2020

Abstract
Using Eu2O3 as source of europium, anhydrous ethanol as solvent system, methylene benzoyl(DBM) as first ligands, triphenyl phosphine (TPPO) as second ligands, the europium(III) ternary rare earth complex Eu(DBM)3TPPO has been successfully prepared. The samples were characterized by fluorescence spectrum(FS), Fourier transform infrared spectroscopy(FT-IR), thermogravimetry differential scanning calorimetry(TG-DS) and scanning electron microscope(SEM). The influence of TPPO on luminescence intensity, color temperature, color coordinates, morphology and thermal stability of the samples were analyzed. The results showed that the addition of second ligand could enhance the luminescence intensity of Eu(DBM)3TPPO. Eu(DBM)3TPPO can emit strong red fluorescence when excited by 395nm ultraviolet light. The color coordinate of Eu(DBM)3(TPPO) is (0.63, 0.36). The Eu(DBM)3TPPO is a kind of red luminescent material with wide application prospect.
Lightweight optimization design of arm frame for aerial work platform based on NSGA-II algorithm
Authors: Wang Zhiyong , Liu Xiping 
Published: January 2020

Abstract
In the previous lightweight design of the arm of aerial work platform, it is difficult to balance the relationship between lightweight and stiffness reduction. This paper proposes a lightweight design that minimizes the variation stiffness while reducing weight. Taking the arm mass and stiffness variation as the objective, which constrained by yield strength and stiffness of the material, the Pareto front of each arm section size is obtained by the second generation of elite strategy non-dominated sequencing genetic algorithm (NSGA-II). Finally, the finite element model is established by ANSYS to compare the static and dynamic performance of the arm before and after optimization. The results show that the weight of the optimized arm is reduced by the original 13.3%, lightweight effect is remarkable.
Preparation and Characterization of Tetraphenylporphyrin Dyes
Authors: Li Xinhui 
Published: January 2020

Abstract
Porphyrin compounds exist widely in nature and are a key part of photosynthesis and photosynthesis. Because of its good photothermal stability and many unique physical and chemical properties, it has been widely used in the research and development of sensitized dye solar cells. As a new type of solar cell, dye-sensitized solar cell has attracted extensive attention and research due to its simple manufacturing process, relatively cheap price, high photoelectric conversion efficiency and environmental protection. In this paper, control experiments were carried out to synthesize tetrabenzoporphyrin with higher yield and purity by changing the solvent and washing solvent. The samples were characterized by uv-vis spectra. The results showed that the tetraphenylporphyrin crystals with better comprehensive effect could be obtained by using ethanol solution as sample solution and distilled water as washing solvent.
Preparation of TAT tri-layer insulating film on automotive glass using magnetron sputtering method
Authors: Chen Yifan 
Published: January 2020

Abstract
In this paper, tri-layer structured films of titanium dioxide, silver and titanium dioxide were deposited on ordinary glass using radio frequency magnetron sputtering method to serve as thermal insulation films on automotive glass. The transmittance and thermal insulation of the prepared insulating films were changed by altering the deposition time of silver and titanium dioxide. The transmittance, absorbance and thermal insulation of the insulating films to visible light and infrared light were measured by ultraviolet-visible spectrophotometer and infrared spectrometer. The thermal conductivity of the films with different transmittances was tested by the thermal conductivity tester. The insulating films with lower thermal conductivity were screened out for analysis, and on this basis, the experiment was improved continuously. The total solar energy rejection rate was calculated subsequently. After summarizing the whole experiment process, the improvement measures were put forward to optimize the production of insulation films on automotive glass. The results show that the transmittance of TiO2-Ag-TiO2 tri-layer insulation film is 70.19%, and the solar energy rejection rate is 67.80%. The transmittance meets the national standard and the total rejection rate is also higher than many of the insulation films on the market.
Designing Cor–Shell Materials Using Humic Acids
Authors: Skripkina T S , Podgorbunskikh E M , Lomovsky O I 
Published: January 2020

Abstract
Due to the high content of complexing moieties, humic acids are promising compounds for designing heavy metal sorbents that can be used in natural environment objects. Experiments focused on designing sorbent particles containing a humic shell and a core (that is supposed to impart the desired performance characteristics to the particle) and applying humic acids onto various materials were conducted. It is demonstrated that the sorbent with a “lignocellulosic core–humic shell” structure can be produced mechanochemically. The efficiency of humic acid binding to lignocellulosic materials directly correlates with lignin content within lignocellulosic materials. A method for passing lignin from the surface of lignocellulosic biomass into the solution using humic acids is found. Unmodified highly lignified biomass is the optimal material for applying humic acids onto lignocellulosic materials.
Scaling up the Mechanochemical Technology for Producing Materials Enriched in Humic Acids
Authors: Skripkina T S , Bychkov A L , Rozhanskaya O A , Lomovsky O I 
Published: January 2020

Abstract
Mechanochemical treatment is widely used in industry as it allows one to reduce the number of processing stages, either reduce or completely eliminate the use of solvents, automate the technology and ensure its mobility. Energy input is an important parameter of mechanochemical treatment. In this study, the technology of mechanochemical oxidation of brown coal was scaled up using the planetary mills of AGO-2 and APF types, as well as K-7 and CEM-20 flow-type vibrocentrifugal mills. The technology of mechanochemical oxidation of brown coal makes it possible to increase the availability of humic acids in brown coal and the content of oxygen-bearing groups capable of complexation, as well as to improve sorption characteristics of the resulting product. Materials enriched in humic acids can be used as heavy metal sorbents in water bodies and as agents for soil amelioration. The rotor speed of 1400 rpm and the feed rates of 15 kg/h and 1.8 kg/h for CEM-20 and for K-7 vibrocentrifugal mills, respectively, are the optimal modes from the point of view of chemical and economic efficiency. These modes increase the yields of alkali-soluble and water-soluble humic acids from 23 to 59 % and from <1 to 7%, respectively, which corresponds to the values reached using the laboratory-scale equipment.
Modification of Manila Grass Activated Carbon for Reactive Dye Adsorption from Textile Printing Wastewater
Authors: Charnkeitkong P , Phoophuangpairoj R 
Published: January 2020

Abstract
The aim of this research is to focus on the activated carbon modification for the elimination of Novacron Brilliant Red EC-3GL which is a reactive red dye onto Manila Grass carbonaceous as an adsorbent with chemical activation. The Manila grass waste from the football field was obtained to carbonize at 400 °C. Three-types of chemicals, such as sodium chloride (NaCl), potassium hydroxide (KOH), and phosphoric acid (H3PO4) were used to soak for 1 h before pyrolysis at 700 °C for 2 h. The analysis of activated carbon properties and effects of dye adsorption, such as pH of the feed solution, time to adsorb, the amount of adsorbent, concentration and temperature were studied. Langmuir isotherm and Freundlich isotherm were applied to consider the adsorption mechanism. From the analysis, activated carbon with sodium chloride activation was a high surface area of 148.6 m2/g and a low porosity of 25.72 °A. From the experiments were found that pH for adsorption of 2, absorption time 90 minutes, concentrations used in the adsorption of 50 ppm and the adsorption temperature 30 °C were optimum for dye adsorption. The NBR adsorption percentages from aqueous solution and textile printing wastewater were 77.87 and 85.52, respectively. The adsorption mechanisms of activated carbon were consistent with Langmuir isotherm for an aqueous solution and Freundlich for textile printing wastewater.
Thermoelectric properties of poly (3,4-ethylenedioxy thiophene)/poly (sulfonic acid diphenyl aniline) composites synthesized in the absence and presence of magnetic field
Authors: Ugraskan Volkan , Karaman Ferdane 
Published: January 2020

Abstract
Poly(3,4-ethylenedioxy thiophene)/polysulfonic diphenyl aniline (PEDOT:PSDA) composites in the ratios of 1:0.5, 1:1, 1:1.5 and 1:2 were synthesized by oxidative chemical polymerization in the absence and presence of external constant magnetic field which the flux density is 3 kGa. The samples were characterized by UV–vis, FTIR-ATR and XRD. Their thermoelectric properties were obtained by means of electrical conductivities and Seebeck coefficients measurements. It was found that both the conductivity and Seebeck coefficients of the PEDOT:PSDA composites were increased in the presence of magnetic field. The conductivities of PEDOT:PSDA composites are lower whereas their Seebeck coefficients are considerably higher than that of commercial PEDOT:PSS. The highest power factor was obtained as 32 μW m-1K−2 for the composite PEDOTPSDA = 1:1 synthesized in the presence of magnetic field. The power factor of this sample was enhanced to 185 μW m-1K−2 by a secondary doping with sodium dodecyl benzene sulfonate.
Facile in-situ synthesis of 2D/3D g-C3N4/Cu2O heterojunction for high-performance photocatalytic dye degradation
Authors: Si Ying , Zhang Xiaoxian , Liang Tingting , Xu Xun , Qiu Lingfang , Li Ping , Duo Shuwang 
Published: January 2020

Abstract
Constructing heterojunction is a promising method to enhance visible-light utility and promote photogenerated e−-h+ pairs separation of g-C3N4. Herein, the present work reported a g-C3N4/Cu2O heterojunction by a facile in situ synthetic strategy. The structure, morphology, optical, electrochemical and photocatalytic properties were investigated. The results showed the combination of g-C3N4 nanosheets and Cu2O nanospheres resulted in the close contact interface and wide visible-light response range, and fast separation of the photo-generated e−-h+ pairs. The pristine g-C3N4 showed weak photocatalytic performance towards methyl orange (MO) under visible-light irradiation, compared with pristine g-C3N4, the photocatalytic degradation rate of optimized g-C3N4/Cu2O composite demonstrates the substantially enhanced photocatalytic activity, which showed no obvious loss after five repeated use. The enhanced performance was ascribed to the synergistic effect of good visible-light harvesting and enhanced separation rate of the charge carriers.
In-situ one pot synthesis of graphene-ZnO nanohybrid and its application to UV light detection
Authors: Rattan Sonal , Kumar Suresh , Goswamy J K 
Published: January 2020

Abstract
The development of molecular/nanoscale level assemblies allows the foundation of many potential novel applications. Chemical approach is one of the most favoured techniques to manipulate the nano-materials in a controllable manner. Herein, we report a simple and reliable one pot technique for preparing graphene-ZnO nanohybrid by coordinating zinc metal ions from precursor, which further led to the growth of ZnO nanoparticles on graphene sheets. The developed heterostructures were characterized through X-ray diffractometry, Fourier transformed infra-red (FTIR) spectroscopy, UV-visible spectroscopy and field emission scanning electron microscopy (FESEM). Morphological details revealed the dense loading of ZnO nanoparticles onto the surface of graphene. The nanohybrid was found to be electrically more responsive to the incident UV light compared to ZnO nanoparticles alone. The proposed method can lead to the fabrication of highly sensitive flexible light detector.
Optical characterization of photocatalytic copper doped thin films of anodized titanium
Authors: Rotich Julia , Mwamburi Mghendi , Walter Njoroge , Maghanga Christopher , Munyati Onesmus , Hatwaambo Sylvester 
Published: January 2020

Abstract
Titanium oxide is used in a myriad of applications such as in capacitors, insulation paints among others. It is a prime candidate for water splitting due to its photocatalytic properties. In this work, undoped TiO2 thin films were prepared by anodizing titanium foils cut into pieces measuring 60 mm by 20 mm. The specimens were anodized in an electrolyte consisting of 0.5 M H2SO4 and 0.075% wt HF at room temperature. The anodizing voltages ranged from 50 V to 100 V. Anion doping of copper in as anodized TiO2 was done electrochemically. The as anodized Ti foils were dipped in a 1 M Cu2SO4 solution. All samples were annealed at 450 °C for 3 h. Near-normal total reflectance was measured on as anodized and copper pigmented samples in the solar (300–2500 nm) wavelength range. Spectrophotometric reflectance data was analyzed to obtain the absorption coefficient and using the same to determine the band gap of the films. It was noted that the films exhibited reduced solar integrated reflectance for TiO2 samples prepared at lower anodic voltages of 50, 60 and 70 V. The copper pigmented, and annealed, TiO2 samples exhibited both direct and indirect energy band gaps in the ranges, 3.38–3.86 and 2.50–2.74, respectively. Further, annealing and copper doping of the films lead to increased absorption. The photocatalytic activity of the films was assessed by measuring the rate of degradation of 10ppm methylene blue in UV light source. Copper doped TiO2 exhibited enhanced photocatalytic performance in compared to pure TiO2. An increase in the anodization voltage caused subsequent increase in photocatalytic activity of films with 70 V as the optimum voltage above which photo degradation of methylene blue decreased.
Effect of friction stir processing and hybrid reinforcement on wear behaviour of AA6082 alloy composite
Authors: Satish Kumar T , Shalini S , Krishna Kumar K 
Published: January 2020

Abstract
In the present study, microstructure, mechanical properties and wear behaviour of AA6082 alloy reinforced with Yttrium oxide (Y2O3) and graphite (Gr) surface hybrid composites produced via friction stir processing have been investigated. Vol.% of Y2O3 particles was varied (2, 4 and 6 vol.%) while the graphite content was kept at as 4 vol.%. Microstructure of synthesized composites revealed uniform distribution of Y2O3 + Gr particles accompanied by a significant reduction in grain size. Microhardness of the composites was found to be 40% higher than the matrix alloy and tensile strength of the composites increased with increase in vol.% of Y2O3 with a marginal decrease in ductility. Wear test results along with SEM micrographs of worn out surface of composites and matrix alloy were compared and correlated with their hardness. Hybrid composites showed better wear resistance.
The synergistic effect of biosynthesized silver nanoparticles from a combined extract of parsley, corn silk, and gum arabic: in vivo antioxidant, anti-inflammatory and antimicrobial activities
Authors: Helmy Aya , El-Shazly Mohamed , Seleem Amany , Abdelmohsen Usama , Salem M Alaraby , Samir Ahmed , Rabeh Mohamed , Elshamy Ali , Singab Abdel Nasser B 
Published: January 2020

Abstract
Microbial resistance, oxidative stress, and inflammatory conditions are among the leading causes of death worldwide. In the current work, silver nanoparticles (AgNPs) were biosynthesized using the aqueous extracts of parsley, corn silk (CS), gum Arabic (GA) or combination of the three extracts. The formed nanoparticles were characterized using three techniques including transmission electron microscopy (TEM), UV-visible spectrophotometer and Fourier-transform infrared spectroscopy (FTIR). The antioxidant, anti-inflammatory, and antimicrobial activities were tested for the formed nanoparticles, the aqueous extracts of each of the three plants and their combination. Oxidative stress was induced by alloxan which promoted the development of diabetes mellitus in rats. Inflammation was induced by injecting carrageenan in rats’ paws. Pathogenic microorganisms causing serious urinary tract infection (UTI) were selected for the antimicrobial assay. All aqueous extracts and the biosynthesized AgNPs showed variable degrees of antioxidant, anti-inflammatory and antimicrobial activities, however, the AgNPs biosynthesized by the combination of the three aqueous extracts was the most effective one. LC/MS was done to identify the compounds present in the crude extracts that may be responsible for the observed biological activities. LC/MS resulted in the identification of 13 compounds. Docking experiments on COX-1 (cyclooxygenase-1) and COX-2 (cyclooxygenase-2) were performed to determine the compounds responsible for the anti-inflammatory activity of the extracts. The results showed that silver nanoparticles synthesized by the combination of the three aqueous extracts are considered promising candidates for the development of antioxidant, anti-inflammatory and antimicrobial agents.
Bismuth sulphide decorated ZnO nanorods heterostructure assembly via controlled SILAR cationic concentration for enhanced photoelectrochemical cells
Authors: AL-Zahrani A A , Zainal Z , Talib Z A , Lim H N , Holi A M 
Published: January 2020

Abstract
The current study investigates Bi2S3 thin films coated on ZnO NRAs with varying cationic concentrations through ionic layer adsorption and reaction (SILAR) technique. XRD patterns reveal that Bi2S3 is successfully synthesised and exhibits orthorhombic structure on the wurtzite ZnO NRAs. The band gap energy (Eg) of Bi2S3/ZnO NRAs shows a notable red shift with increasing cationic concentration. The photocurrent density increases significantly with increasing concentration from 1 mM to 3 mM before decreases at higher concentration due to agglomeration of Bi2S3 NPs and formation of recombination centres. The hybrid photoanode Bi2S3/ZnO NRAs at 3 mM exhibits the highest photocurrent value (1.92 mA cm−2), which is about six times greater than that of plain ZnO NRAs (0.337 mA cm−2). The high photoconversion efficiency value of 1.65% versus 0.5 V Ag A−1g−1C−1l−1 is obtained by Bi2S3/ZnO NRAs (3 mM) in comparison with pristine ZnO NRs, mainly due to the stepwise band alignment edge and significant enhancement of morphological and optical properties. The study reveals that controlling the cationic concentration can potentially improve the photoconversion efficiency.
Synthesis of silicon nanoparticles by laser ablation at low fluences in water and ethanol
Authors: Serrano-Ruz J A , Quiñones-Galván J G , Santos Cruz J , de moure-Flores F , Campos González E , Chávez-Chávez A , Gómez-Rosas G 
Published: January 2020

Abstract
Colloidal silicon nanoparticles (Si-nc) where synthesized by laser ablation of a solid Si target in water and ethanol. The target was immersed in a vessel containing the solvent and irradiated during 5 and 10 min at different fluences: 0.530, 0.608, 0.687 J cm−2. Ablation was carried out using a laser wavelength of 1064 nm. The obtained colloidal nanoparticles were irradiated after the synthesis to evaluate if laser fragmentation could be produced. In addition, a series of nanoparticles using ethanol as liquid medium was synthesized ablating with 532 nm. Colloidal nanoparticles were structurally characterized by Raman spectroscopy and Transmission Electron Microscopy. Size of the Si-nc were calculated by the theorical models: Bond Polarizability Model (BPM) and One-Phonon Confinement Model (PCM), where nanocrystals ranging from 2 to 11 nm were found.