期刊：
Journal of Energy Resources Technology,2023年145(6):J. Energy Resour. Technol. 1-20 ISSN：0195-0738
通讯作者：
Yang, L
作者机构：
[Li, Yu; Yang, Liu] Wuhan Polytech Univ, Dept Mech Engn, Wuhan 102249, Hubei, Peoples R China.;[Wang, Deguo; Yang, Liu] China Univ Petr, Dept Mech & Transportat Engn, Beijing 102249, Peoples R China.;[Li, Dongyang; Yang, Liu] Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 1H9, Canada.
通讯机构：
[Yang, L ] W;Wuhan Polytech Univ, Dept Mech Engn, Wuhan 102249, Hubei, Peoples R China.;China Univ Petr, Dept Mech & Transportat Engn, Beijing 102249, Peoples R China.;Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 1H9, Canada.
关键词：
particles deposition;power-law shearing;CFD simulation;wellbore cleaning;sand bed change;petroleum engineering
摘要：
Particles deposition and plug-in wellbore cause lots of damage and efficiency reduction during oil and gas exploitation. Transportation has been a focus for safety and production improvement. The annular flow field and particles transport behavior have been investigated using computational fluid dynamics with an renormalization group k-e method. Effects of particles volume concentration, washing fluid concentration with power-law shearing, annular eccentricity, flow rate, and rotation speed have been researched to get the mechanism of particles accumulation and transport behavior. The results show that an increase in eccentricity causes velocity reduction of the annular narrow gap area, particles easily deposit, accumulate, and are hard to transport; increasing flow rate and fluid concentration apparently improve particles transportation and reduce deposition, pressure loss increases; inlet particles volume concentration increases deposition starting position and deposition length, the inner pipe rotation facilitates particles' second suspension.
摘要：
Acrylonitrile butadiene styrene (ABS) polymer refers to a high-molecular-weight amorphous copolymer with a wide softening range and specific viscoelasticity of polymer material. The application of such powder materials in additive manufacturing technology for selective laser sintering (SLS) for forming and its post-processing enhancement are rarely investigated. In this paper, the standard specimens of ABS powder were fabricated by SLS. The dimensional accuracy and the mechanical properties of specimens were examined, and the microstructure of tensile fracture was observed under a scanning electron microscope (SEM). The tensile, flexural, and impact strengths were obtained as 2.44 MPa, 5.10 MPa, and 2.77 kJ/m2, respectively, as indicated by the results of this study. Accordingly, the SLS ABS parts are not suitable as functional prototypes. According to the thermodynamic equation, dissolution equation, capillary permeability formula, and the selection of diluent, the influence of diluent on viscosity, the influence of curing time on viscosity, and the influence of curing agent and viscosity on permeability are studied. Thus, the parts were infiltrated with two different types of epoxy resin (system Y and system W) to enhance the mechanical properties. The mechanical properties of specimens administrated with curing agent W increased 4.57, 3.87, and 1.64 times in terms of tensile, flexural, and impact strength, respectively; the others administrated with curing agent Y increased 6.38, 3.52, and 1.05 times, respectively. Accordingly, the results indicate that the SLS ABS parts enhanced by epoxy resin can serve as function parts, which is a feasible method since the properties of the composites can be readily tailored by changing different infiltration resins.
摘要：
This study revolves around the issues raised by the current semiconductor device metal casings (mainly composed of aluminum and its alloys), such as resource and energy consumption, complexity of the production process, and environmental pollution. To address these issues, researchers have proposed an eco-friendly and high-performance alternative material-Al(2)O(3) particle-filled nylon composite functional material. This research conducted detailed characterization and analysis of the composite material through scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). The results show that the Al(2)O(3) particle-filled nylon composite material has a significantly superior thermal conductivity, about twice as high as that of pure nylon material. Meanwhile, the composite material has good thermal stability, maintaining its performance in high-temperature environments above 240 °C. This performance is attributed to the tight bonding interface between the Al(2)O(3) particles and the nylon matrix, which not only improves the heat transfer efficiency but also significantly enhances the material's mechanical properties, with a strength of up to 53 MPa. This study is of great significance, aiming to provide a high-performance composite material that can alleviate resource consumption and environmental pollution issues, with excellent polishability, thermal conductivity, and moldability, which is expected to play a positive role in reducing resource consumption and environmental pollution problems. In terms of potential applications, Al(2)O(3)/PA6 composite material can be widely used in heat dissipation components for LED semiconductor lighting and other high-temperature heat dissipation components, thereby improving product performance and service life, reducing energy consumption and environmental burden, and laying a solid foundation for the development and application of future high-performance eco-friendly materials.
通讯机构：
[Li, B ; Yan, SL ] W;Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430023, Hubei, Peoples R China.;Wuhan Univ Technol, Sch Sci, Wuhan 430070, Hubei, Peoples R China.
关键词：
deep eutectic monomers;eutectic gel;frontal polymerization;ionic conductive;self-healing
摘要：
Preparation principle of eutectic gels. Abstract The development of elastomers from renewable raw material resources, with excellent properties, has been a major and difficult area of research. In this work, ternary polymerizable deep eutectic monomers (DEMs) were synthesized from acrylamide, choline chloride, and glycerol (Gy). A series of mixed hydrogels were prepared in 15 min through thermal initiation in DEM using a frontal chemical change. The eutectic gel exhibited good mechanical and self‐healing properties, and the mechanical and self‐healing properties of the target gel could be regulated by adjusting the proportion of Gy, while the eutectic gel could maintain high elongation and self‐healing efficiency at low temperatures. Additional, eutectic gels could be compressed to a strain of more than 80% and could immediately recover to their original state when the compression force was released. In the cyclic compression test, the eutectic gel cyclic compression curves showed a high degree of overlap, and no significant hysteresis was observed, even at a set strain of 80% and 100 cyclic compression times. In addition, the eutectic gel showed fine ionic conductivity, and both the water content and Gy content could affect its conductivity, giving it the potential to be used in the application of manufacturing pressure‐sensitive sensors.
通讯机构：
[Li, B ] W;Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430023, Hubei, Peoples R China.
摘要：
Deep eutectic solvent (DES) was synthesized from choline chloride (ChCl) and acrylamide (AM), and P(AM-co-MA) hydrogels were prepared by adding different contents of maleic acid (MA) to DES by frontal polymerization. Fourier infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used to characterize the hydrogels at the microscopic level, and the swelling properties, mechanical properties, self-healing properties and electrical properties of the copolymerized hydrogels were also investigated. The results showed that the equilibrium swelling of the hydrogels was significantly enhanced with the increase of pH due to the addition of MA. The hydrogel with the addition of MA has self-healing properties that pure PAM does not have. In terms of electrical conductivity, the increase of MA makes the internal structure of the hydrogel more loose, which is conducive to the passage of free ions. And there is a significant effect of different temperatures and different crosslinker contents on the electrical conductivity. In summary, we prepared a P(AM-co-MA) hydrogel that can produce significant property changes in response to changes in the external environment, which is expected to expand the application of hydrogels in flexible electronic materials.
摘要：
Cu64Zr36 metallic glass powders were prepared via gas atomization.The high-temperature oxidation behavior of Cu64Zr36 metallic glass powders under the influence of internal factors(powder particle size)and external factors(oxidation temperature and oxidation time)was experimentally investigated by using XRD,DSC,TGA,SEM and TEM.The oxidation kinetics,oxide phase,surface morphology and microstructure of metallic glass powders were analyzed.The results show that Cu64Zr36 metallic glass powders form multiple layers of surface oxides after oxidation and the major components of the surface oxides are t-ZrO2,m-ZrO2,Cu2O and CuO.The oxidation kinetics follows a double-stage parabolic rate law.The oxidation process is dominated by the inward diffusion of O anions and the outward diffusion of Cu cations.Thermodynamic analysis shows that the Gibbs free energy change of the oxidation reaction increases with the decrease of particle size,leading to a more rapid and thorough oxidation of the powder with a smaller particle size.
通讯机构：
[Li, B ] W;Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430023, Hubei, Peoples R China.
摘要：
The present study synthesized a deep eutectic solvent (DES) using acrylic acid (AA), acrylamide (AM), and choline chloride (ChCl), and added phytic acid (PA) as a filler. Subsequently, the PA/P(AA-co-AM) composite hydrogel was prepared under ultraviolet irradiation and used a photoinitiator. Characterization of the hydrogels was conducted using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The study aimed to investigate the impact of PA on the mechanical properties, fatigue resistance, and electrical conductivity of the composite hydrogel. The findings demonstrated that as the mass fraction of PA increased, the compressive strength of the composite hydrogel gradually decreased, yet the fatigue resistance of the composite hydrogel increased. Specifically, after 10 cycles of compression, the resilience recovery rate of FP0 dropped from 86.9% to 70.4%, the maximum stress recovery rate of FP1 dropped from 97.9% to 89.4%, the maximum stress recovery rate of FP2 dropped from 94.4% to 86.6%, and the maximum stress recovery rate of FP3 dropped from 97.3% to 93%. Overall, this study offers a straightforward and efficient method for producing composite hydrogels with both fatigue resistance and electrical conductivity.
期刊：
JOURNAL OF ANIMAL PHYSIOLOGY AND ANIMAL NUTRITION,2023年107(1):228-237 ISSN：0931-2439
通讯作者：
Wan, LL;Ai, H
作者机构：
[Feng, Ke; Chen, Yan; Lu, Jianjian] Wuhan Polytech Univ, Sch Mech Engn, Wuhan, Peoples R China.;[Wan, Lili] Wuhan Polytech Univ, Sch Elect & Elect Engn, Wuhan 430048, Peoples R China.;[Ai, Hui] Cent China Normal Univ, Sch Life Sci, Wuhan, Peoples R China.
通讯机构：
[Ai, H ] C;[Wan, LL ] W;Wuhan Polytech Univ, Sch Elect & Elect Engn, Wuhan 430048, Peoples R China.;Cent China Normal Univ, Sch Life Sci, Wuhan, Peoples R China.
摘要：
The chicken is rich in various proteins, fatty acids, polysaccharides, trace elements, and other human essential nutrients that contribute to its high nutritional value. In this study, the expression levels of nutrition-related genes (acetyl-CoA acyltransferase, ACAA) of native chicken breeds were investigated. The level of GgalACAA1-2 transcripts expression in the liver of chicken was significantly higher than that of muscle and heart. Moreover, three protein extracts were isolated from the muscle, heart, and liver tissues from the chicken, and their nutritional function was evaluated in the present study. These protein extracts had excellent DPPH and hydroxyl radical scavenging capacities and exhibited significant superoxide anion scavenging ability. Moreover, the protein extracts of muscle tissue showed an important mouse splenocyte proliferation activity and could be used as an immunomodulator of natural origin. In addition, this report presented an automatic visual inspection of chicken viscera using the active contour algorithms and the image processing method for eviscerating by the parallel robot. The recognition and positioning rate of chicken viscera obtained by the proposed method could reach 96.45%. These methods provided basic data for automated poultry slaughter and segmentation, avoiding unnecessary health risks by a pathogenic microorganism, such as avian influenza, Newcastle disease virus, and coronavirus. Moreover, the internal organs of the chicken could be fully harvested by the image segmentation of automatic evisceration, which also facilitated the processing value of these internal organs as by-products of poultry.
作者机构：
[Xinyu Du; Jibing Chen; Yong She; Yanfeng Liu; Yang Yang; Junsheng Yang; Shijie Dong] School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, 420023, China
通讯机构：
[Jibing Chen] S;School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, 420023, China
摘要：
Ti6Al4V alloy has been found extensive use in various sectors like aerospace, medical service, national defense, and industrial automation. In this study, Ti6Al4V alloy was obtained by selective laser melting (SLM) to investigate the effects of different process parameters on the quality, relative densities, and morphology of the parts produced, as well as the influence of linear energy density on the quality of these parts. The results of the research show that the optimal forming parameter is attained when the laser power ranges from 190 to 250 W, the scanning speed ranges from 600 to 720 mm/s, the overlap rate is 50 %, and the relative density of the specimens reaches up to 99.3 %. Accordingly, the linear energy density is in the range of 0.26–0.36 J/mm. Vickers hardness and tensile strength tests were performed for the samples, the mechanical properties of the samples exhibit the highest value of 300 ± 1.5 HV and tensile strength of 1180 MPa. By analyzing the experimental results, it can be observed that there is a direct correlation between the linear energy density and the quality of the forming process. When the linear energy density is excessively high, the parts are porous and defective. Conversely, the titanium alloy does not melt sufficiently, which makes it difficult to complete forming. According to the above results, the forming performance of the parts is improved by optimizing the process parameters, and the waste of materials is reduced. Meanwhile, a feasible reference for Ti6Al4V alloy by SLM is provided.
