bluuebunny/crossref_metadata_2025_split huggingface dataset:
Preparation of a gel-type microbial-missile for biodegradation of oil pollution
Authors: Shi Jianqiang , Zhang Shaojun , Wang Mingyu 
Published: February 2020

Abstract
The removal of oil spill pollution is a global problem. In order to solve the problem of low biodegradation efficiency, a series of microbial-missile materials with high floatability, hydrophobicity and biological affinity were prepared to enhance the degradation of oil spill. Hydrophobic macroporous materials with polar groups inside and hydrophobic aliphatic polyester outside were prepared by physical and chemical methods using SA/PVA as substrate for gel-type microbial-missile. The experimental results show that the saturated adsorption rate of macroporous gel-type microbial-missile to oil particles is as high as 18.17 g/g, the contact angle is 149.300°, the average density is 0.5883 g/cm3, the average mechanical strength is 2.52 mN, the penetration rate of 40 s is 82.72%, and the degradation rate of crude oil in 7 days is 88.95%.
The research of relative permeability curve for microbial flooding in Baolige oilfield
Authors: Liu Shasha , Fu Yaxiu , Gu Yi , Wang Rui , Wang Guan , Duan Lisha , Guo Suzhen , Wei Lili 
Published: February 2020

AbstractTo adequately simulate environment of Baolige oilfield reservoir, research the seepage variation of microbial in the reservoir, we selected the current microbial flooding system, nature core, dehydration crude oil and injection water of Baolige oilfield. And the evaluation experiments of microbial flooding system and the relative permeability experiments of water flooding and microbial flooding were carried out. Results showed that the flooding system had obvious effect to reduce the emulsification, viscosity and IFT. Comparing to the water flooding, the two-phase seepage area expanded, oil phase permeability endpoint shifted to the right, and residual oil saturation decreased when using microbial flooding. The water phase permeability decreased and the oil phase permeability increased. The relative permeability in the isotonic point changed little, but shifted to the right. Microbial flooding anhydrous recovery period was longer, and the anhydrous recovery rate was higher. In the condition of the same injection, microbial flooding had higher degree of reserve recovery and the displacement pressure was lower. The experiment results fully reflected the two-phase flow in the microbial flooding process, and provided important parameters and basic basis for the prediction and effect evaluation of microbial flooding.
Preparation of Biodiesel Based on Alkaline Ionic Liquid [Bmim]OH Catalyzed Castor Oil
Authors: Zhang Aihua , Wang Qin , He Yidan , Lai Pengying , Miu Yifu , Xiao Zhihong 
Published: February 2020

Abstract
In this experiment, a new basic ionic liquid [Bmim]OH was synthesized from 1-methylimidazole and sodium hydroxide, which was used to catalyze the preparation of biodiesel from castor oil. The catalyst of [Bmim]OH was compared with KOH and tetrabutylammonium hydroxide during the study. The experimental results showed that the latter two were better than the latter two. The orthogonal experimental design scheme was used to optimize the process conditions. The optimized catalytic conditions of alkaline ionic liquid [Bmim]OH were as follows: the catalyst dosage was 1%, the molar ratio of alcohol to oil was 6:1, the reaction temperature was 40 °C, and the reaction time was 60min. Under the optimized conditions, the crude methyl ester mixture yield is higher than 97%, the castor oil is more than 95% converted to the product methyl ester, and the catalyst of [Bmim]OH is used for six times without significant consumption, and the catalytic performance is stable.
Removal of Oil from SZ36-1 Simulated Oil Sands Using Sophorolipid Biosurfactant
Authors: Wang Junqi , Wang Juan , Dong Sihao , Li Guobin , Kong Xiangping 
Published: February 2020

Abstract
The sophorolipid biosurfactant was used to remove the oil from the SZ36-1 simulated oil sands. The effects of the sophorolipid concentration, the mass ratio of sophorolipid solution to oil sands (liquid/solid ratio), and the extraction time on the oil extraction efficiency were investigated. Based on the single-factor tests, the optimum results were obtained under the conditions of sophorolipid solution concentration to be 100 mg·L−1, the liquid/solid ratio to be 50:1 and the extraction time to be 2 h. The corresponding oil extraction rate from oil sands reached up to 42%, which was comparable to the result from 2.5 g·L−1 chemical surfactant of sodium dodecyl sulfate (the value of 2.5 g·L−1 was higher than its critical micelle concentration). The oil extraction rate of crude oil with sophorolipid solution was almost not affected by the existence of sodium chloride. The sophorolipid biosurfactant has high surface activity and good oil removing capacity, and is expected to replace the synthetic surfactants to be used in petroleum exploitation and crude oil pollution treatment.
Study on diffusion of NaOH solution in zinc-rich epoxy coating using EIS
Authors: Yang Chao , Zili Li 
Published: February 2020

Abstract
In order to explore the diffusion process of NaOH solution in zinc-rich epoxy coating, in this paper, conventional three-electrode system was used to test the open circuit potential and electrochemical impedance spectrum, and equivalent electric circuit was fitted to get the related parameters including capacitance, resistance, phase angle and et al to reveal the diffusion process. The results show that three stages are divided including diffusion in coating, finite layer diffusion and double layer diffusion, and two criterions are put forward.
The research progress on micro-arc oxidation of aluminum alloy
Authors: Yuting Dong , Zhiyang Liu , Guofeng Ma 
Published: February 2020

Abstract
The micro-arc oxidation of aluminum alloy is a kind of surface treatment technology for in-situ growth of a hard ceramic film with Al2O3 as the main effect of instantaneous high temperature and high pressure generated by arc discharge on the surface of aluminum alloy. This technology can significantly improve the wear resistance, corrosion resistance, hardness and other properties of the aluminum alloy matrix. This paper introduces the characteristics, influencing factors, research status of domestic and foreign micro-arc oxidation technology, and prospects for future research directions.
The establishment of a newly modified numerical global springback compensation method
Authors: Xiong Wei , Zhang Wenfeng , Lv Yong , Chuan Li , Song Xiaohui , Xia Yushan 
Published: February 2020

Abstract
Part shape deviation caused by spring back is a quality problem in sheet metal forming. There are two major approaches, adjusting tooling shapes and adopting process control. This paper focused on tooling contour design. A new die design approach, called global compensation method (GC), has been proposed and it possesses following advantages. Compensation factor in displacement adjustment method (DA) is extended to a compensation matrix, thus every node has its own compensation magnitude and compensation direction, which are related to the global forming error.
Prediction of Miscibility of HTPB Curing System and Solvents by Molecular Dynamics Simulations
Authors: Bo Liu , Xiaoyu Bu , Lin Wang 
Published: February 2020

Abstract
In order to study on HTPB curing system and solvent’s miscibility, molecular dynamic simulations were performed to analyse curing system’s miscibility with water, ethyl alcohol, methylbenzene, acetone and tetrahydrofuran from several aspects like solubility parameter, molecular configuration and density distribution. The result shows that the computed results of the solubility parameter have high consistency with experimental values and the maximum relative error is less than 3%. The solubility parameter differences of acetone, tetrahydrofuran and curing system are relatively small with a homogeneous distribution and a relatively high miscibility. Methylbenzene’s miscibility is general while the ethyl alcohol’s and water’s miscibility are relatively poor.
Optimization and control of NOx in coke oven vertical flue under flue gas recirculation
Authors: Wang Guanghua , Wang Guocheng , Wang Qingdong , Yan Zihao 
Published: February 2020

Abstract
The orthogonal experimental design with CFD simulation was carried out to simulate combustion in the coke oven vertical flue at external flue gas recirculation. The control of nitrogen oxides (NOx) generation was analysed by different factors such as air excess coefficient, oxidant preheating temperature, flue gas recirculation and oxidizer inlet cross-sectional area ratio. The simulation results showed that the the orthogonal experimental design with CFD had a significant effect on the combustion process. The flue gas recirculation ratio effectively improved the temperature distribution uniformity in the vertical flue, and had a significant effect on NOx production in the vertical flue. Within the parameters of the orthogonal design, when the air excess coefficient was 1.1, the oxidant preheating temperature was 1200 K, the flue gas recirculation ratio was 30%, and the oxidant inlet cross-sectional area ratio was 0.5, the NOx production in the coke oven vertical flue was the smallest, lower than the industry emission standard.
Dry surface modification of heavy calcium carbonate powder with two modifiers
Authors: Li Min , Yang Xiaohong , Chen Jianbing 
Published: February 2020

Abstract
In this work, The modification of heavy calcium carbonate powder was studied by dry surface modification with stearic acid and anhydrous citric acid. we have developed a facile and inexpensive dry surface method to fabricate a lower oil absorption value of calcium carbonate surface. The modification process was analyzed by modifying temperature, modifying time, modifiers percentage. Infrared spectral and TG showed that stearic acid modifier was mainly reducing oil absorption value of CaCO3 powder from 33.9 ml/100 g to 19.0 ml/100 g.
Preparation of porous composite materials with semi-coke based activated carbon doped with graphene oxide
Authors: Yang Zhiyuan , Ning Hai Long , Jia Hong , Li Yinyan , Meng Zhuoyue , Chen Zhiping 
Published: February 2020

Abstract
In this paper, the waste semi-coke is used as the carbon precursor, doped with a certain amount of graphene oxide (GO), and activated by KOH to obtain graphene-doped activated carbon. The changes of morphology and structure were compared by SEM, the properties of specific surface area and pore structure were tested by nitrogen adsorption at low temperature, and the changes of iodine adsorption capacity of samples with different ratio were tested. Finally, the graphene-doped activated carbon with specific surface area of 1072.08 m2/g and iodine adsorption capacity of 1223.99 mg/g was obtained. The optimal ratio of semi-coke to graphene oxide was 300:1, KOH and the semi-coke ratio is 4:1, which provides an excellent adsorbent for the adsorption of methane and carbon dioxide.
Synthesis of triple-doped core/shell/shell upconversion nanoparticles
Authors: Fu Ying , Du Yuanyuan , Hu Qixing , Gao Xing , He Wen , Li Zhihua 
Published: February 2020

Abstract
A novel triple-doped core/shell/shell NaGdF4/NaGdF4:Yb, Tm,Nd/NaGdF4 upconversion nanoparticles(UCNPs) has been designed and synthesized by thermal decomposition. Yb3+ and Nd3+ were used as sensitizers and Tm3+ with multi-level was activators. Three-layout nanoparticles exhibits 1.5 times strong emission than two-layout structure. The UC spectrum exhibits two bands centered at 525–535 and 578–585 nm from Nd3+, corresponding to 4G7/2–4I9/2 and 4G7/2–4I11/2 transitions after excitation at 800 nm. These nanocrystals are promising an attractive luminescent biomarkers for biological and magnetic resonance imaging.
Preparation and Drug Release Properties of Fe3O4/Chitosan Magnetic Microspheres
Authors: Li Mingming , Zhang Xuyan , Zhan Shiping , Hou Weimin 
Published: February 2020

Abstract
Fe3O4/chitosan(CS) magnetic microspheres were prepared by emulsion crosslinking method, in which 5-fluorouracil (5-Fu) was loaded as model drug. The preparation conditions were optimized by orthogonal experiment with the the package rate as an index. The structure and morphology of the magnetic microspheres were characterized by scanning electron microscopy(SEM). The drug release properties of the microspheres in vitro were investigated. The optimal preparation conditions of drug loaded magnetic microspheres were as follows: 0.3 g 5-Fu, 5 mL glutaraldehyde, 3 h crosslinking time and 0.2 g/ml acetic acid concentration. Under these conditions, the drug loading efficiency was up to 6.35% as well as the package rate was up to 35.2%. The Fe3O4/chitosan magnetic microspheres also displayed an excellent drug release behavior under the experimental conditions of simulated intestinal fluid. The releasing content reached a peak in 10 h.
Study on chemical looping reforming reaction of methane based on PSO-BP neural network
Authors: Liu Yongbin , Ma Xiaoxun , Xu Long 
Published: February 2020

Abstract
Through the study of methane chemical looping reforming reaction, the BP neural network model optimized by the PSO algorithm was established, and the network structure of the PSO-BP model was determined to be 9-11-3. After training the model, the mean square error of the network was finally stabilized at 0.013509, and the learning rate was finally fixed at 0.083453, while the fitting degree of the training sample and the test sample were both above 0.979, indicating that the network of the PSO-BP model had strong learning ability and generalization capability, and was a simulation prediction model with good performance. The PSO-BP model was used to simulate the full set of experimental condition data, and the most experimental condition was the cerium iron composite oxygen carrier prepared by co-precipitation method (No.2) with a molar ratio of 0.7/0.3, a calcination temperature of 800 °C, a calcination time of 6h, a reaction temperature of 850 °C, a reaction time of 13min, and a circulation number of 0, while it was consistent with the actual experimental.
Ceo2 promoted the performance of Ni/Al2O3 catalyst for CRM reaction
Authors: Lv Penggang , Ma Xiaoxun , Xu Long 
Published: February 2020

Abstract
The promoted effect of CeO2 on the reaction of Ni/Al2O3 catalyst in the syngas of CO2 reforming of methane (CRM) was studied. The results showed that the catalyst prepared with CeO2 addition exhibited high activity and stability, and the conversions of CH4 and CO2 could reach 96% at 800 °C when the amount of Ce was 5 wt%. SEM, H2-TPR, CH4-TPSR and CO2/O2-TPO characterization indicated that addition CeO2 could enhance the interaction between support and Ni species in preparation process, enabling the capacity of catalyst to resist carbon deposition and metal sintering.
Efficient synthesis of γ-valerolactone from ethyl levulinate over Ni/V2O5
Authors: Cao Xi , Dong Heda , Chen Han , Xu Qiong , Yin Dulin 
Published: February 2020

Abstract
γ-valerolactone (GVL) has been recognized as one of the most value-added chemicals derived from biomass. In this work, an efficient Ni/V2O5 catalyst was prepared via solid phase grinding and in-situ reduction. The Ni/V2O5 catalyst was employed for catalytic transfer hydrogenation (CTH) of ethyl levulinate (EL) to GVL using 2-propanol as a hydrogen source. An excellent GVL selectivity of 93.04 % at EL conversion of 97.40 % could be achieved at 180 °C in 4 h using 30% Ni/V2O5 as the catalyst. This catalyst was able to be reused for five times with the GVL selectivity decreased a little. A possible adsorption mechanism of generate active H species in CTH of EL over Ni/V2O5 was proposed.
Free vibrations of cylindrical laminated shells – introduction to optimal design in divergence and flutter problems
Authors: Muc A. , Augustyn M. 
Published: February 2020

Abstract
Aeroelastic properties, such as free vibrations of multilayered composite cylindrical shells, are investigated in the present paper. It is well known that the eigenmode (eigenvalue) analysis is a crucial point in the estimations/calculations of the divergence and flutter speeds characterizng dynamic instability. In this study the maximization problem of eigenfrequencies and eigenmodes is discussed, especially from the point of view of stacking sequences of composite panels. A special attention is focused on two types of the shell wall construction: a) angle-ply ±θ and b) symmetrical discrete laminates built of layers oriented at 0°. ±45° 90°. The analytical formulae is derived with the use of the Rayleigh-Ritz method for simply supported cylinders. It allows us to solve the optimum problem easily for angle-ply fibre orientations. For symmetrical laminates with discrete fibre orientations the optimal solutions are searched for using finite element analysis combined with genetic or evolutionary algorithms. The influence of geometrical parameters describing the cylindrical panel is also demonstrated herein.
The Influence of Diameter-to-thickness Ratios on the Response and Failure for Locally-dented Circular Tubes Submitted to Cyclic Bending
Authors: Lee K. L. , Weng M. L. , Pan W. F. 
Published: February 2020

Abstract
This paper describes the cyclic bending response and failure of 6061-T6 aluminum alloy locally-dented tubes (abbreviation: 6061-T6 LDT) with different diameter-to-thickness ratios (abbreviation: D
o/t ratio) of 16.5, 31.0 and 60.0. A small lateral local dent was created on the tube using a simple technique. A tube having a dent depth from very shallow to about 2.4 times the thickness of the tube wall is considered. From the first bending cycle, the moment-curvature relationship depicts a closed and stable loop. Due to small and localized dents, dent depth shows very small influence on its relationship. But, as the number of bending cycle increases, the ovalization-curvature relationship shows an increase and a ratchet-like distribution. However, the dent depth shows a dramatic effect to this relationship. Furthermore, for a certain D
o/t ratio, five non-paralleled straight lines of five different dent depths were found for the controlled curvature-number of cycles required to ignite failure relationship on a log-log scale. Finally, an empirical formula was introduced to describe the aforementioned relationship. As a result, the experimental and analytical data were found to agree well.
Absorptive protective padding with electrospinned polyester fibers with hydrogel matrix
Authors: Soh C. B. , Lee X. H. , Lim Samuel W. Y. , Sipalah N. F. B. , Ho Paul 
Published: February 2020

Abstract
Hip fractures has been prevalent especially among aged elderly. This can lead to permanent disability of the elderly as they are wheel-chaired bound after suffering from hip fractures. In this work, we explore the design of a protective hip pad which encapsulate the hydrogel and fibres composite in a laminated sheet. The hydrogel was fabricated using Polyvinyl alcohol (PVA) with distilled water. Two types of electrospinned fibres, Nylon-6 fibres and polyester fibres were used as filler. The fabrication of hydrogel matrix composite was varied by the weight percent of nylon 6,6 pellets dissolving in formic acid as compared to Hydrolysed Poly(Vinyl alcohol) to form crosslinked PVA with water. The impact absorption concept was to allow the gel-like hydrogel to flow through the fibres pores and during this process, part of the energy would be dissipated in the matrix composite. This lower the impact force being transferred to the user’s hip and prevent the facture of the elderly’s hips during fall. The protective padding with 20 layers of polyester fibres with 2.5wt % of PVA had the lowest impact force of 0.8 kN as compared to conventional protective padding with measured 1.07kN impact force for impact study.
Design of Joint Test Device for Fuel Delivery Shut-off Valve
Authors: Kong Guangming , Zhu Lonxiang , Zou Gang , Wang Zhanyong , Zhang Ding , Yu Dehui 
Published: February 2020

Abstract
In view of the fact that the new aircraft units were used, it was common to lack the fuel accessory inspection equipment, a set of combined test equipment for fueling and fuel delivery shut-off valve was designed. The basic work of the fuel delivery shut-off valve was introduced, the composition and principle of fueling test system and electric control system were described, and the realization methods of the hardware and software were given. The practical application shows that the test equipment can meet the test requirements of this type of fuel accessories, fully meeting the design goals.
Study on Activation of Waste Clay Brick Powder
Authors: Changwei Xu , Xutong Yang 
Published: February 2020

Abstract
Recycling and recycling of construction waste is a hot research topic nowadays. In this paper, clay bricks in building waste are activated by physical method (grinding) and chemical method (alkali activation). The effects of fineness after grinding time, types and dosage of activator on the activity of waste brick powder are studied. The results show that with the increase of grinding time, the specific surface area of waste brick powder increases, and the activity coefficient of waste brick powder increases. When grinding time is 90 minutes, the activity index reaches 67%. When the specific surface area of waste brick powder is 467 m2/kg, the activity index of waste brick powder increases first and then decreases with the increase of calcium hydroxide content. When calcium sulfate dihydrate is added alone, the activity index of waste brick powder increases first and then decreases with the increase of calcium sulfate dihydrate content. When calcium hydroxide and calcium sulfate dihydrate are mixed together, the increase of activity index is better than that of calcium hydroxide and calcium sulfate dihydrate alone. The 4% calcium hydroxide + 3% calcium sulfate dihydrate composite system has the best activation effect on brick powder.
Synthesis and Photocatalytic Activity of Submicron Strontium Titanate in Soluble Polymer System
Authors: Dong Yingnan , Zhao Yan , Tang Jian , Bi Xiaoguo 
Published: February 2020

Abstract
Recently, micro-nano-strontium titanate photocatalytic materials have been one of the research hotspots because they can degrade organic pollutants. In the work, 200-400 nm strontium titanate powder was synthesized by soluble polymer (PEG) system and low-temperature direct precipitation method. Studies showed that the concentration of PEG and the degree of polymerization had a significant effect on the particle size of the powder. At the same time, the work studied the photocatalytic properties of the obtained strontium titanate powder, discussing the effect of particle size of strontium titanate on its photocatalytic activity.
Study on Mechanical Properties of Wall Panel with Insulation Decoration Structure
Authors: Zhang Jusong , Li Wangqiang , Yang Zhenyu 
Published: February 2020

Abstract
In order to explore the safety performance of the wall panel with insulation decoration structure in the actual application, some test were made. The test results of this paper show that: The rock wool with a density of 120 kg/m3 and the polyurethane with a bonding density of 50 kg/m3 are selected as the core material for the temperature retention, whose average tensile strength can reach 139.33 KPa; The mean value of single point anchoring force of 12 mm thick ceramic plate and back bolt as decorative surface is 2088.29 N, and the mean value of the structural adhesive strength between the ceramic plate and keel is 3092.07 KPa; When the uniformly distributed load on the wallboard reaches 6.53 KPa, its deflection reaches 1/180 of itself.