Dynamic graph link prediction aims to predict the formation or disappearance of links between nodes in a graph based on their historical interactions. To address the issue of high energy consumption associated with modeling dynamic networks using recurrent neural networks at fine-grained temporal graphs, a dynamic graph link prediction model optimized by spiking neural networks was proposed. By the node memory updater incorporated spiking neural networks and the spiking update process of node memory, the evolving dynamics of dynamic graphs were learned by graph neural networks and the model achieved link prediction. The results on three publicly available classic datasets show that the proposed model exhibits improved runtime efficiency while maintaining accuracy, showcasing favorable performance in dynamic graph link prediction tasks.

In order to clarify the depositional environment of the Upper Permian Wutonggou Formation, the Dalongkou section at the southern margin of the Junggar Basin was taken as an example, and the following understanding was obtained by analyzing the lithology, lithofacies types, lithofacies assemblages, and spatial spreading laws of anatomical section sands. Three types of eight gravel, sand, and mudstone phases capable of characterizing diagenetic sands in the Wutonggou Formation were summarized. Based on the lithofacies, four lithofacies assemblage types were further established, representing the point bar, the cross-bank breakout fan, and the fluvial sands, respectively. Through the analysis of the lithofacies combination of the section, the sedimentary subfacies of point bar, crevasse splay, and floodplain in the period of Wutonggou Formation can be further identified, and the sedimentary response model of meandering river with the change of lake level was established. The sedimentary facies and sand body distribution of underground reservoirs were clarified by the results of outcrop research.

To further improve the transmission performance of non-circular gear pair, a new helical non-circular gear with point contact was proposed based on the meshing principle of gears. Mathematical model of helical non-circular gear with point contact was constructed. Geometric kinematic relationships between the pitch curve and tooth profile curve for helical non-circular gear with point contact under spatial coordinate system were deduced. Tooth surface design of the gear was completed. Three-dimensional solid models of helical non-circular gear pair with point contact was established by using the convert-tooth shape method. The dynamic simulation model of helical non-circular gear with point contact was established. The dynamic meshing forces of the new gear pair and general involute non-circular gear pair under the same conditions were analyzed. Meshing characteristics of helical non-circular gear with point contact under different working conditions were also obtained. The tooth surface contact state and contact stress of point contact non-circular gear and involute non-circular gear under the same parameter and working condition were compared and analyzed. Research results provide an important theoretical support and reference value for the design and application of non-circular gear pair.

The shale of Middle-Upper Permian in the Lower Yangtze area is an important source rock in the region, but the research on the elemental characteristics of different sedimentary facies is still lacking in the past. Continuous X-ray fluorescence(XRF) element scanning was performed on the shale core of the Middle-Upper Permian in Well Gangdi 1 in the Lower Yangtze Region. The contents of main elements such as Si, Al, Ca, Fe and trace elements such as Sr, Rb, Ti and their ratios in the middle and upper Permian strata were analyzed, and the evolution characteristics of sedimentary environment were discussed in combination with the quantitative analysis of mineral composition of samples. The results show that the elements such as Al, Ti, Si and Rb, which have strong indicative significance for terrestrial deposition, have a high-high-low variation in the vertical direction. The Ca, Sr and other elements indicating marine deposits are mainly concentrated in the upper Dalong Formation, and the content of other layers is low, and there are abnormal values in some areas. The ratio of element content has a certain rule, among which Rb/Sr and Ba/Sr show a low-high-low trend. The maximum value of Al/(Al+Fe+Mn) ratio is 0.8, the minimum value is 0.4, and the average value is 0.71, which is generally greater than 0.6, indicating an important source of biogenesis. The Middle-Upper Permian belongs to the transitional-marine reduction environment. From bottom to top, the sedimentary environment changes from deep-water basin facies to deep-water shelf facies to sea-land transition facies to shallow-water shelf facies. During this period, the water body changes from deep-shallow-deep. Among them, the early stage of the Gufeng Formation is the deep-water basin phase, and then gradually enters the deep-water shelf phase. The Longtan Formation is dominated by the sea-land transition phase, and the relative sea level changes frequently during the sedimentary period. In the deep-water period, the lithology is dominated by self-deposited limestone, and the corresponding element Ca content is high. In the shallow water period, it is mainly light gray mud shale deposition, and the corresponding main elements change to Si and Al. After the short-term subsidence of the sea level in the Dalong Formation, the water body gradually deepened, dominated by continental shelf deposition.

Affected by the continuous rainfall in the rainy season, the Taihe Town moraine soil paleolandslide is a giant soil-rock complex paleolandslide with a volume of about 1 200×10⁴ m³, which began to be resurrected in 2021 and entered the creep stage. By 2022, the growth rate began to decline in the rainy season, which seriously threatened the normal mining inside the pit. Based on field investigation, drilling exposure, field monitoring, and physical and mechanical tests, the influencing factors and resurrection mechanism of ancient landslides were explored on the basis of identifying the micro-topography, geological structure characteristics and deformation instability stages of ancient landslides. The results show that the accumulation of rock and soil and topography are the basis of ancient landslide resurrection, and rainfall infiltration and mining excavation are the inducing factors of landslide resurrection. The analysis shows that under the influence of long-term rainfall leaching, fine particulate matter accumulates at the base-cover interface to form a sliding zone, and mining excavation causes an effective free face at the leading edge. Under the long-term influence of groundwater, the strength of the sliding zone soil is gradually reduced. Rainfall leads to increased seepage and reduced shear strength, which induces the revival of ancient landslides. The research results have certain reference value for similar engineering problems.

Quality distribution detection is regarded as a crucial basis for regulating the rare earth extraction process. The variation of the lanthanum (La), cerium (Ce), praseodymium (Pr), and neodymium (Nd) solution system during the saponified P507-kerosene extraction is significant, showing obvious nonlinear characteristics such as time-varying and strong coupling. Moreover, the solution system exhibits no apparent color change. Existing soft measurement methods based on machine vision and artificial neural networks have shown unsatisfactory application effects. To address these issues, a mechanistic modeling method was first employed to construct a mathematical model for the quantitative analysis of the four components. Subsequently, by measuring the characteristic gamma-ray intensity information of the natural radioactive isotope ¹³⁸La@1.436 MeV (auxiliary variable), the mass distribution information of the four components (main variable) was predicted simultaneously. Finally, experiments were conducted based on a high-purity germanium detector. The results show that the minimum detectable mass concentration of La is 1.70 g/L. Compared with the experimental results, the relative errors of the predicted mass concentrations of La, Ce, Pr, and Nd are -3.11%~4.23%, -5.81%~3.74%, -8.16%~6.68%, and -19.87%~14.20%, respectively. The relative errors of the sensitivity prediction are 1.33%, 5.56%, -3.20%, and -0.41%, respectively. The proposed “gamma ray-soft measurement” method enables high-accuracy and high-sensitivity prediction of the four components La, Ce, Pr, and Nd. The detection process is not affected by changes in extraction system density, acidity, temperature, and other parameters, providing new technical references for rare earth extraction quality distribution detection.

At present, there are fewer studies on the macroscopic mechanical hysteresis model of magnetically controlled smart magnetorheological elastomer (MRE), which is not conducive to the application control of MRE materials. To improve the control effect of MRE materials, an experimental study on MRE’s magnetostrophic shear mechanical properties based on the Bouc-Wen model was conducted. The influence of magnetic field strength on the mechanical parameters of MRE was analyzed. Firstly, with the assistance of Simulink to establish the Bouc-Wen simulation model was established for MRE parameter fitting. Then, the stiffness, damping, and other material parameters were analyzed with the magnetic field strength change rule. Finally, through the experiments, the model validity was examined. The results show that with the increase of magnetic field strength, the parameters of MRE energy storage and energy consumption have different degrees of increase, in which the equivalent stiffness and maximum damping force increase significantly, respectively, increase 210.61%, 205.41%. In the range of 0.5~0.7 T magnetic field parameter growth rate is faster in the range of 0.7~1.0 T growth tends to be saturated. The dynamic mechanical properties of MRE are better described by the Bouc-Wen model, and the maximum error of the characteristic parameters is 4.42%. The research results can provide theoretical and experimental references for the optimal preparation and algorithmic control of MRE materials.

In order to efficiently develop the ultra-deep thin interbedded carbonate gas field, the development well of Lei-4 gas reservoir in western Sichuan gas field adopted a three-spud casing program. The first spud section was drilled into the Penglaizhen Formation to the third member of Xujiahe Formation. Due to the large variation of soft and hard sand mudstone, and the existence of mud shale or sand mudstone is easy to be hydrated and denudated, there will be falling block, collapse and other problems. The second spud section was drilled into the formation from the 3rd of Xujiahe Formation to Maantang Formation. The formation shale and coal seam are interbedded frequently, the uncased hole section is long and high pressure fractured gas layer, these factors are prone to risk of wellbore instability, well loss and even blowout. The third spud section was drilled into the fourth member of Leikoupo formation. Due to the alternations of limestone and dolomite, the stress difference between layers is large, and the formation is broken, it is easy to cause local instability of borehole wall, and even collapse, stuck drilling and other downhole complications. In the face of challenges, through theoretical research, laboratory experiments and field application optimization, potassium-based polysulfonic drilling fluid technology was used in the first section, the compound salt strongly inhibited polysulfonic anti-collapsing drilling fluid technology was used in the second spud section, strong plugging white oil base drilling fluid technology was used in the third section, have been formed to solve the technical problems faced by drilling fluids. The successful application of more than 10 wells has achieved remarkable results in speed and efficiency improvement..Among them, well PZ5-1D has a drilling depth of 8 208 m and a drilling cycle of 252.79 days.

The rapid development of new energy vehicles has made the industry’s requirements for high-performance automotive motors continue to increase. Hybrid excitation motor is a new type of motor. The hybrid excitation motor combines the advantages of permanent magnet excitation and electric excitation, and has excellent regulation and reliability. A parallel claw-pole hybrid excitation motor structure was proposed. The magnetic circuit of the hybrid excitation motor was optimized by means of parallel axial excitation of permanent magnet and electric excitation device. On this basis, the parametric simulation of the thickness of the claw pole side plate and the large end of the excitation bracket of the motor was carried out respectively, and the average torque of the motor before and after optimization was simulated according to the optimal structure. Finally, the mechanical characteristic curves of the parallel claw-pole hybrid excitation motor and the permanent magnet synchronous motor were compared and analyzed. The results show that the parallel claw-pole hybrid excitation motor broadens the operating range of the motor by 17.24% on the basis of maintaining the torque performance, and improves the mechanical properties and adaptability of the hybrid excitation motor.

In order to study the effect of polymer microsphere profile control and flooding on produced fluid and deepen the understanding of the profile control and flooding mechanism of polymer microsphere, the produced fluid in typical blocks of major reservoirs such as ultra-low permeablity, super-low permeablity and low permeablity in Changqing oil field were analyzed and studied. After using gravity separation and centrifugal separation methods to obtain crude oil and produced water, the changes in the composition of crude oil group, K⁺, Na⁺, Ca²⁺, Mg²⁺, $\mathrm{SO}_{4}^{2-}$ ions, and water content in the produced water before and after profile control were analyzed, and the variation patterns were summarized. The results show that after injecting polymer microspheres into each typical block, the saturated alkane content in the crude oil decreases, the non-hydrocarbon content increases, the water content significantly decreases, and the salinity of the produced water increases. Through the above research, it has been further clarified that polymer microspheres mainly play a “blocking” role in reservoirs, and residual oil is utilized by expanding the swept volume of injected water, providing a theoretical basis for the production increase of Changqing Oilfield through profile control and flooding.