Sichuan Fine Arts Institute

In order to clarify the aging law of drilling fluid andthe formationmechanism of sealing properties, thereby providing a theoretical basisfor the design of drilling fluid sealing evaluation methods and fordetermining the necessity of secondary cementing in uncemented intervalsof oil wells, laboratory experiments were conducted in this study.The influencing factors of the coalescence stability and sedimentationstability of the drilling fluid, as well as the temporal and spatialevolution law of the macroscopic properties and microscopic morphologyof the aging drilling fluid, were systematically analyzed in turn.The results show that a high temperature of 120 °C and a calciumand magnesium ion concentration of 1000 mg/L significantly weakenthe coalescence stability of the drilling fluid. However, sedimentationstability can be effectively improved by increasing the viscosityand reducing the fluid loss, lowering the temperature, decreasingthe concentration of calcium and magnesium ions, or increasing theamount of barite. With the extension of the standing time, the settlementof the system exhibits a three-stage evolution characteristic of “stability–stabilitydeterioration–restability”. At 50 days, the densitydifference between the upper and lower layers reaches 2.27 g/cm3, and the gel strength steadily increases to a peak valueof 124 Pa. The annular fluid forms a sealing layer due to the denseaccumulation of a colloidal network and solid phases in the middleand lower layers.

Constructed around 300 BCE, the South Stoa of Corinth, a multi-functional public building, possessed a roof outfitted with of thousands of roof tiles. Over the course of 150 years, some original tiles were damaged and new ones laid in their place. These substitute tiles are similar to but not quite the same as the originals and often possess manufacturer stamps indicative of their “non-authentic” nature. In 146 BCE Corinth was sacked by the Romans and largely abandoned, with the roof likely suffering damage during the initial attack, and decay over the subsequent period of abandonment. At some point during the first century BCE, the entire roofing system of the stoa was replaced by Roman citizen colonial Corinthians. As with the earlier replacements, the Roman roof tiles have functional and decorative elements similar to the ca. 300 BCE originals; however, the manufacturing process differed with ornamentation coming only from molded forms. This paper examines the production and decoration of the South Stoa roof tiles as material evidence for the curation of an architectural and cultural heritage. I will argue that the design of the replacement tiles was a deliberate choice used to evoke the original appearance of the South Stoa rather than employing more contemporary or simpler designs. More broadly, this discussion situates itself within the discourse of cultural heritage concerning the identification of “maintenance”, “repair”,”replacement”, and “reconstruction” in an ancient context. While these are modern terminologies and practices implemented in the conservation and management of cultural heritage in the present, they also can be witnessed in the past.

Mental health among college students represents a significant and growing public health concern. Negative bias in prospection is closely related to depression and anxiety. Prospection bias (PB) encompasses increased negativity, reduced positivity and overgeneralization, which exhibit intricate co-occurrence patterns and exert a complex influence on mental health. However, the presence of distinct patterns of PB and their impact on mental health remain unknown. We recruited 1,030 Chinese college students to complete assessments of PB, depression, anxiety, stress and resilience. Latent profile analysis (LPA) was used to identify distinct PB profiles. Linear regression was then applied to examine their effects on mental health outcomes. The results suggested six profiles: (1) high levels of increased negativity and overgeneralization but a low level of reduced positivity (contradictory overgeneralizers), (2) low PB, (3) moderate low PB, (4) a high level of increased negativity but low levels of reduced positivity and overgeneralization (simple contradictory), (5) high PB, and (6) moderate high PB. Regression analyses demonstrated that high prospection bias predicted more severe stress, depressive and anxious symptoms, as well as lower resilience. Additionally, the results implied that handling increased negativity and reduced positivity of prospection might be potential ways to improve mental health. These findings may facilitate the early detection of mental health issues among college students and contribute to the refinement of future interventions.

Abstract This chapter focuses on four Augustan arches that are also the earliest examples of innovative triple-bay arches: the Arch of C. Octavius and the Parthian Arch in Rome, as well as arches in Antioch in Pisidia (Galatia) and Arausio (Gallia Narbonensis). It presents a cohesive interpretation of the Arch of C. Octavius and the Parthian Arch, assessing the urban impact of the new triple-bay format alongside the implementation of a comprehensive architectural and decorative program that celebrates Augustan military victories in Rome. In addition to the triple-bay format, other Augustan innovations are explored, including spandrel decoration, the use of mixed architectural orders, monumental inscriptions such as the Fasti Capitolini, and the emergence of numismatic depictions of arches. The rapid spread of the triple-bay format beyond Rome presents an opportunity to examine how Roman monuments were transmitted, adopted, and adapted in the provinces to engage diverse audiences and signal a connection to Rome.

Abstract The Epilogue begins with a summary of the arguments presented in the book. The Arch of Constantine (312 CE), one of the last freestanding arches built in Rome, serves as a pivotal point for reflecting on the long history of this architectural form. I then review the arch’s development in Rome, starting with the fornices Stertinii. While this book has focused on a specific period (196 BCE–43 CE) and select locations (Rome, Arausio, Antioch in Pisidia), the Epilogue concludes by succinctly outlining the wide-ranging new functions and geographical expansion of the arch during the imperial period. New arches are erected as funerary monuments, to commemorate Roman infrastructure, including roads and bridges, to celebrate the establishment of new colonies, and to delineate city boundaries, or pomeria. Finally, the Epilogue examines how architectonic and iconographic elements of the freestanding arch were adapted for city gates during the Augustan period to emphasize the Pax Augusta and the triumph of Rome.

Presbyopia refers to a degenerative disease in which the ability of the eye to accommodate gradually decreases with age. As the public demand for better quality of life rises, presbyopic correction surgery has become a clinical hotspot, with various surgery plans, techniques, and designs emerging in clinical practice. Based on the technical principles of how presbyopic surgery compensates for accommodation loss in presbyopia, this article elaborates on the selection of presbyopic correction surgery plans and the designs of corneal laser presbyopic surgery, with a focus on the application of extended-depth-of-focus technology in corneal laser presbyopic surgery, so as to further explore related theoretical and clinical problems and provide reference for relevant clinical work.

Tennis performance is highly influenced by serve speed. This review aimed to evaluate and quantitatively compare the efficacy of popular strength and conditioning (S&C) training methods in enhancing the speed of the ball in the serves of tennis players. Following PRISMA guidelines, a systematic search was conducted in the Scopus, Web of Science, SportsDiscuss, and PubMed databases without date constraints, up to July 2024. Studies included in this meta-analysis met PICOS criteria: a) randomized controlled trials with healthy tennis players, b) isolated or combined S&C training programs, c) evaluation of tennis serve speed, and d) adequate data to compute effect sizes (ESs). The PEDro scale was used to assess methodological quality. Out of 271 identified papers, 16 studies of moderate to high quality were included in the meta-analysis. Resistance training demonstrated a small but significant effect on serve speed (ES = 0.53; p < 0.001), while multimodal training exhibited a moderate and significant effect (ES = 0.79; p = 0.001). However, core training did not have a significant effect on serve speed (ES = 0.32, p = 0.231). The findings suggested that S&C interventions, including resistance and multimodal training, were beneficial for increasing serve speed in tennis players. Further high-quality research is recommended to confirm this conclusion. https://www.crd.york.ac.uk/prospero/display_ record.php?RecordID=519790, identifier CRD42024519790.