E3S Web of Conferences
EISSN : 2267-1242
Published by: EDP Sciences (10.1051)
Latest articles in this journal
E3S Web of Conferences, Volume 337; https://doi.org/10.1051/e3sconf/202233704003
Ninety female lambs of the Beni-Guil sheep breed were used to study the effect of slaughter live weight (SLW) on carcass characteristics and meat quality. The animals were raised in Morocco’s eastern area under a pastoral-transhumant system. The lambs were slaughtered at three weight classes (SLW1 =20-25 kg, SLW2 = 26-30 kg, SLW3 = 31-35 kg). Ultimate pH value (pHu), fat and meat color, zoometric measurement, conformation score, fatness state, and fat consistency were evaluated 24 h post-slaughter. The carcass measures and compactness indexes increase with higher SLW (p0.05) by SLW effect. With respect to meat color, the lightness (L*) decreased with increasing SLW, while the redness increased (p<0.05). The female lambs with a carcass weight of 20-25 kg have a higher L* value (41.89), and lambs with a carcass weight between 31 and 35 kg have a higher redness value (21.73). In relation to the c1arcass fatness state and carcass conformation, the SLW had a significant effect (p<0.001). The conformation and the fatness increase in the logical sequence of SLW.
E3S Web of Conferences, Volume 338; https://doi.org/10.1051/e3sconf/202233801009
Surfactant flooding is a common technique in tertiary oil recovery. However, due to the high temperature of some reservoirs and the strong heterogeneity caused by their own geological conditions, the use of common surfactants in high-temperature reservoirs is limited. Temperature - resistant surfactants can reduce interfacial tension, improve conformance and increase oil washing efficiency In this paper, a temperature-resistant nano-type surface active JCN-001 was developed in the laboratory. By testing its particle size distribution, the experimental results can determine that the average particle size range of the system is 34.29nm, so that it can play a better role in low permeability reservoir recovery. Due to its unique nano properties, JCN at 0.2% concentration can still maintain a good effect at about 110, and the oil/water interfacial tension can reach 10-4nm/m, and can also reach ultra-low interfacial tension at high temperature, and the higher the temperature, the more significant the effect According to the changes of surface tension and oil-water interfacial tension, the critical micelle concentration was determined to be about 0.2%. The static adsorption experiments and dynamic adsorption experiments were carried out. The results show that the temperature resistant nano-surfactants have strong adsorption resistance and can effectively reduce the consumption of surfactants on rocks.
E3S Web of Conferences, Volume 338; https://doi.org/10.1051/e3sconf/202233801036
Earthworms can have an important effect on a variety of processes that determine soil fertility and play a very important role in natural ecosystems. The biomass and density of earthworms in 4 different land utilize types in the Qinling mountains were investigated using the wet funnel method. The relationship between the characteristics of earthworm populations characteristics and environmental factors were analysed, and the significant differences in soil earthworm density (P< 0.05) and fresh weight (P< 0.05) were discovered under different land utilize types, and all showed the highest value in orchard land, followed by woodland and grassland, in addition, the lowest was discovered in cultivated land. In addition, Pearson correlation analysis indicate that soil earthworm population characteristics was strongly negatively correlated with soil ammonium nitrogen (NH4+-N), and strongly positively correlated with fine root biomass. The clarified relationship between earthworm population characteristics and soil physical and chemical properties will help qualitatively predict and evaluate the ecological functions of terrestrial earthworms in Qinling mountains.
E3S Web of Conferences, Volume 338; https://doi.org/10.1051/e3sconf/202233801015
In this article, borax was used as the prime agent, and the organic boron that cross-linked agent was synthesized using adding sodium tartrate. The synthesis response shapes were optimized using unmarried factor way. The temperature opposition and crosslinking time of the fracturing fluid were used as the appraisal standards to decide the organic boron. The cross-linking agent's optimal synthesis statuses were measured, and the chemical and forcible holdings of the fracturing fluid after cross-linking with the polyvinyl alcohol-based liquid were measured.
E3S Web of Conferences, Volume 338; https://doi.org/10.1051/e3sconf/202233801026
Based on constant rate mercury injection experiment, casting thin section identification, scanning electron microscope observation, clay mineral X-ray and rock specific surface area analysis, the controlling factors of matrix acidizing potential of low-permeability sandstone reservoir in fault depression lacustrine basin were determined from three aspects: pore filling, throat filling and pore-throat combination characteristics. It is concluded that provenance controls the plane partition of reservoir pore fillings. Burial depth controls the longitudinal zoning of key filling material in reservoir throat. The difference of rock structure in sedimentary facies - microfacies controlling zone leads to the change of pore-throat assemblage pattern. The matrix acidizing scheme of low permeability sandstone reservoir in fault depression basin can be formulated according to the law of “provenance zoning, buried depth zoning and being controlled by microfacies in zone”, and the implementation scheme of pre-acid, main acid and post-acid can be put forward respectively. This method can effectively promote the integration process of exploration and development of low permeability clastic reservoir in mature exploration area.
E3S Web of Conferences, Volume 338; https://doi.org/10.1051/e3sconf/202233801025
The fine characterization of channel sand body is a complex system engineering. The longitudinal superposition relationship of channel is complex, the sandstone thickness is thin, and the lateral changes of lithology and physical properties are obvious. It is necessary to carry out the research on the integration of processing and interpretation and seismic geology. The key technologies of seismic high-resolution pre stack and post stack inversion of medium and shallow channel sand bodies with “improved HHT point spectrum whitening” and “weak sidelobe wavelet structure” as the core and “azimuth well control inversion modeling” and “Cauchy regularization high-resolution inversion” as the core have been formed through experimental research.
E3S Web of Conferences, Volume 338; https://doi.org/10.1051/e3sconf/202233801012
The physical properties of tight gas reservoirs are poor. During the stable production period of gas wells, most of the recoverable reserves are produced in the declining stage. It is of great significance to accurately study the declining law of tight gas. However, tight gas production declines rapidly in the early stage and slower in the middle and late stages, and the single model fitting and prediction results have large errors. In view of the above problems, according to the production change characteristics of tight gas wells, the decline stage is divided into three stages, and a segmented production decline law analysis method is established. The research results show that the early production decline of tight gas wells is exponential decline, the relatively slow middle-term production decline belongs to depletion decline, and the late production decline belongs to linear decline. Based on the study of the law of production decline, a gas reservoir production prediction software was compiled, and the production variation characteristics of single wells and gas reservoirs under certain stable production requirements were studied.
E3S Web of Conferences, Volume 338; https://doi.org/10.1051/e3sconf/202233801039
A trajectory can be seen as the imprint left in space by a moving object over time. In recent years, with the widespread use of civil GPS and other positioning devices on mobile terminals and the development and popularity of location-based services and mobile social networks, a large amount of trajectory data is increasingly accumulated in daily life and served by different types of applications. A large amount of trajectory data is generated in the fields of traffic, weather, ecology and mobile services. The effective understanding and utilization of these data requires not only automatic and efficient analysis methods, but also intuitive and vivid visualization, and this paper summarizes the application of trajectory data in cities.
E3S Web of Conferences, Volume 338; https://doi.org/10.1051/e3sconf/202233801006
Fast capacity estimation for retired batteries is necessary when batteries are recycled for echelon utilization. Here, a fast capacity estimation method is proposed for retired LiFePO4 battery. First, a full survey of battery pack and cells degradation after a long period of service is studied. Then the filtered ICA is used to study degradation variation phenomenon of retired batteries, the relationship between IC curve feature and remaining capacity was studied. Finally, a fast capacity estimation using incremental capacity and Gaussian process regression is proposed. Our results show high efficiency and accuracy of the proposed method.
E3S Web of Conferences, Volume 338; https://doi.org/10.1051/e3sconf/202233801024
In this paper, in view of the problem of low early and late strength of dry-mixed mortar prepared by cement-fly ash-slag powder composite cementing system, the ratio of mixing fly ash and slag powder to replace cement is 70%. To study the effect of desulfurization gypsum (FGD) on improving the activity of the system. The results show that adding desulfurized gypsum, which accounts for 6% to 8% of the total mass of the cementitious material, has no adverse effect on the workability and can significantly improve the compressive resistance of the slurry. Strength and tensile bonding strength, shrinkage rate is reduced by more than 10%, and the ability to resist carbonization is improved to make the mortar volume more stable.