In order to solve the problem of low rock carrying efficiency of coring drilling tools in the process of coring operation under extreme ultra-high temperature and high-pressure environment, and considering the key rock carrying parameters such as coring bit type, cuttings particle size, drilling speed and drilling fluid viscosity in different formations, the three-dimensional model and flow field coupling model of coring tools with different specifications are established. The finite element method is used to evaluate the rock carrying capacity of the annulus of the coring outer cylinder. The results show that for the same type of coring tools, reducing the particle size of cuttings, increasing the viscosity of drilling fluid and reducing the drilling speed can reduce the volume fraction of residual cuttings and improve the rock carrying capacity of coring tools. For the 121,140,172 type coring tools, when the two drilling speeds are 0.8 m/h and 2.1 m/h respectively, the rock carrying capacity gap decreases with the increase of cuttings particle size. When the two drilling speeds of 203 type coring tools are 0.8m/h and 2.1m/h respectively, the difference of rock carrying capacity increases with the increase of cuttings size.

The 14th Five-Year Plan period is a period for my country to further promote the high-quality and high-efficiency development of "technology, fashion, and green". The training direction of college graduates is constantly changing, and school-enterprise cooperation is constantly subdivided and deepened. As a result, college evaluation is also linked to the employment rate of graduates. It is more required that the graduates trained by the school transform into market-oriented application talents. Therefore, following the three basic principles of highlighting student-centeredness, output orientation, and continuous improvement, introducing the concept of corporate brand show in graduation design to carry out school-enterprise linkage and integrated teaching has become an important task that the fashion design major must face, innovate and explore.

To enhance the reliability of new energy grid connected systems, a fault-tolerant model predictive control strategy with low-voltage ride-through capability for grid connected inverter bridge arms has been proposed. Firstly, the operational principles following a single-phase bridge arm fault in the grid-tied inverter are analyzed. Then, a fault-tolerant structure for the grid connected inverter is established by creating a virtual bridge arm using direct current-side capacitors. Subsequently, a current prediction model is established, and control is implemented using redundant vectors. Additionally, by dynamically adjusting reactive current compensation commands based on the relationship between grid voltage drops and reactive current commands, the system is ensured to maintain continuous and stable operation even during grid voltage fluctuations. Finally, experimental results demonstrate that this fault-tolerant control strategy can still maintain the continuous and stable operation of the system when bridge arm faults occur due to grid voltage drops at the inverter grid connection point.

This study investigates the crushing strength of single diamond grains of varying grades and particle sizes using the WDW-100 electronic universal testing machine. The research aims to understand the mechanical properties of diamond particles, which are critical for optimizing the performance of diamond tools in industrial grinding processes. High-grade diamond particles, characterized by their regular polyhedral shapes and minimal impurities, exhibit higher and more stable maximum load forces compared to medium- and low-grade particles. Medium-grade particles show a balance between strength and brittleness, while low-grade particles display significant variability in their structural integrity due to higher impurity levels and defects. The study also reveals that larger diamond particles tend to have lower average maximum load forces, attributed to increased crystal defects and pronounced grain boundary effects. These findings underscore the importance of considering both the grade and particle size of diamond grains in applications requiring high mechanical strength. The insights gained from this research are essential for improving the design and durability of diamond tools, ensuring their efficiency and longevity in industrial applications.

Ethnic minority clothing refers to clothing with unique characteristics of ethnic minorities. Ethnic minorities have rich clothing culture and living habits, and their production techniques are diverse and unique. As traditional handicrafts, with the development of modern society, some traditional handicrafts face severe inheritance problems. Therefore, it is urgent to protect them and they have historical responsibilities. Of course, the value of inheritance is immeasurable. In this article, I take the characteristics of ethnic minority clothing as the starting point and propose specific protection and inheritance strategies, aiming to provide some valuable reference suggestions for the protection and inheritance of ethnic minority clothing.

Gear systems are subjected to repeated loads during long-term operation, and factors such as insufficient lubricant to increase friction between gears, resulting in elevated temperatures and wear, are highly susceptible to tooth spalling. Tooth spalling is a common form of failure in gear failure. In previous studies, the vibration response of a gear pair with spalling defects at the tooth center near the pitch circle has been investigated. However, the location of the spalling defects offset from the center of the tooth flank is rarely studied. Tooth spalling faults occur in the pitch circle, but not necessarily in the center of the tooth, often formed on both sides of the center of the tooth and torsion in the meshing process. the symmetric and asymmetric rectangular spalling defects are considered, the torsional deformation is introduced. “torsional stiffness” is introduced into the overall TVMS due to the spalling defect. Therefore, it is meaningful to grasp the reasons for the formation of tooth spalling.

Today, Chinas ceramic industry is mainly divided into two parts, one is a creative studio and a small characteristic factory, the other is a large daily ceramic industry and an enterprise that can represent the industry. This paper combs these two pieces from the ancient and modern time line, Chinese and foreign space line supplemented by cases to do some production and development of daily ceramics. By paying attention to the reasons for the rise of foreign ceramic brands, and then looking back at the shortcomings of their own brands, in order to understand and summarize the advantages and weaknesses of the development of ancient and modern daily ceramic industry in Chinese and foreign countries, self-innovation, deepen the core, reshaping the continuation of the glorious history of more than 2000 years and the world image of Chinese ceramics.

This paper addresses the chatter problem in thin-walled part milling, reviewing the advancements in mirror milling technology for thin-walled parts. It provides an in-depth discussion of the fundamental causes of chatter during thin-walled part milling. A comparative analysis of the advantages and disadvantages of empirical, finite element, and analytical models for milling force in thin-walled parts is presented. The paper also discusses the experimental methods, finite element modal analysis, and structural coupling methods used to obtain the frequency response functions of workpieces and tools, comparing their respective strengths and weaknesses. Furthermore, time-domain and frequency-domain methods for stability prediction are analyzed and compared, with a discussion on the future prospects of chatter stability prediction in mirror milling.

Research on Luminescent Solar Concentrators (LSCs) is crucial for enhancing the energy density of sunlight and lowering the costs associated with silicon solar cells. This paper thoroughly evaluates and compares the performance of three different LSC materials: Rhodamine B (RBB), Rhodamine 6G (R6G), and Coumarin 6 (C6). The study focuses on several key metrics, including Stokes shift, external quantum efficiency, concentration factor, and conversion factor. By analyzing these parameters, the paper aims to elucidate how each material's properties influence overall performance, providing valuable insights into optimizing LSC design for improved energy harvesting. In order to pave the way for more widespread adoption of LSCs in solar applications, enhancing their role in sustainable energy systems.

This study employed a correlational research method to examine the relationship between coaches’ self-efficacy – specifically in terms of emotion, optimism, work satisfaction and self-confidence -and athletes’ self-efficacy, which includes personality self- efficacy, sports discipline, psychological self-efficacy and professional thought efficacy. A purposive sampling technique was used to specifically select 10 badminton coaches. Meanwhile, stratified sampling was employed to proportionately distribute the 300 athletes from five universities, ensuring representation from different subgroups. This study found no significant correlation between coaches’ self-efficacy and athletes’ self-efficacy as indicated by the p values greatre than the .05 level of significance set in the study. Despite the Spearman rho coefficients ranging from moderate to high, these results were not statistically significant, these findings suggest that while there may be observable trends the relationship between coaches and athletes’ self-efficacy is not conclusively supported by the data.