Limited Space Research Articles

The classical double copy in curved spacetimes: perturbative Yang-Mills from the bi-adjoint scalar

We formulate a version of the double copy for classical fields in curved spacetimes. We provide a correspondence between perturbative solutions to the bi-adjoint scalar equations and those of the Yang-Mills equations in position space. At the linear level, we show that there exists a map between these solutions for maximally symmetric spacetime backgrounds, that provides every Yang-Mills solution by the action of an appropriate differential operator on a bi-adjoint scalar solution. Given the existence of a linearized map, we show that it is possible to cast the solutions of the Yang-Mills equations at arbitrary perturbation order in terms of the corresponding bi-adjoint scalar solutions. This all-order map is reminiscent of the flat space BCJ double copy, and works for any curved spacetime where the perturbative expansion holds. We show that these results have the right flat space limit, and that the correspondence is agnostic to the choice of gauge.

The Hippo signalling pathway in bone homeostasis: Under the regulation of mechanics and aging.

The Hippo signalling pathway is a conserved kinase cascade that orchestrates diverse cellular processes, such as proliferation, apoptosis, lineage commitment and stemness. With the onset of society ages, research on skeletal aging-mechanics-bone homeostasis has exploded. In recent years, aging and mechanical force in the skeletal system have gained groundbreaking research progress. Under the regulation of mechanics and aging, the Hippo signalling pathway has a crucial role in the development and homeostasis of bone. We synthesize the current knowledge on the role of the Hippo signalling pathway, particularly its downstream effectors yes-associated protein (YAP) and transcriptional co-activator with PDZ-binding motif (TAZ), in bone homeostasis. We discuss the regulation of the lineage specification and function of different skeletal cell types by the Hippo signalling pathway. The interactions of the Hippo signalling pathway with other pathways, such as Wnt, transforming growth factor beta and nuclear factor kappa-B, are also mentioned because of their importance for modulating bone homeostasis. Furthermore, YAP/TAZ have been extensively studied as mechanotransducers. Due to space limitations, we focus on reviewing how mechanical forces and aging influence cell fate, communications and homeostasis through a dysregulated Hippo signalling pathway.

BiRD: Using Bidirectional Rotation Gain Differences to Redirect Users during Back-and-forth Head Turns in Walking.

Redirected walking (RDW) facilitates user navigation within expansive virtual spaces despite the constraints of limited physical spaces. It employs discrepancies between human visual-proprioceptive sensations, known as gains, to enable the remapping of virtual and physical environments. In this paper, we explore how to apply rotation gain while the user is walking. We propose to apply a rotation gain to let the user rotate by a different angle when reciprocating from a previous head rotation, to achieve the aim of steering the user to a desired direction. To apply the gains imperceptibly based on such a Bidirectional Rotation gain Difference (BiRD), we conduct both measurement and verification experiments on the detection thresholds of the rotation gain for reciprocating head rotations during walking. Unlike previous rotation gains which are measured when users are turning around in place (standing or sitting), BiRD is measured during users' walking. Our study offers a critical assessment of the acceptable range of rotational mapping differences for different rotational orientations across the user's walking experience, contributing to an effective tool for redirecting users in virtual environments.

Enhanced sodium-storage performances of crumpled MXene nanosheets via alkali treatment–induced active ammonium ions

Ti3C2Tx MXene demonstrates excellent potential as an anode material for sodium-ion capacitors. However, the narrow interlayer spacing and self-stacking phenomenon limit its applicability. In this study, we demonstrate an easy two-step method involving freezing and crumpling of MXene nanosheets to improve their Na-ion storage via the addition of ammonium ions (referred to as FCM nanosheets). Flat MXene particles aggregate and undergo folding in an alkaline solution. Ammonium ions can penetrate the gaps between MXene nanosheets, expanding interlayer spaces and inducing the formation of folds. Compared to MXene nanosheets, FCM nanosheets exhibit improved ion transfer kinetics and additional high capacity owing to the intercalated ammonium ions. The manufactured FCM anode exhibits remarkable electrochemical properties, including a high specific capacity of 313 mAhg−1 and stability over 15,000 cycles.

A new method of oil and water well completion involving the implosion effect

Features of colmatation zones of a productive formation in terms of rotary drilling by drilling muds are considered. A brief analysis of the most popular decolmatation methods is performed. Special attention is paid to the decolmatation method involving implosion effect. An example of one of the existing installations is represented with following consideration of its application features. A new principally different installation, free from the disadvantages found in the available one, is considered; a patent for the installation is obtained in Kazakhstan. It does not involve tubing with its packer and wellhead sealing. It also does not require a compressor and its manifold. Characteristic features of the newly developed installation for creating implosion effect are represented; its operation at producing both single and any number of repeated implosion acts is examined. A mathematical analysis is performed to calculate the empty space limits required for the implosion effect by a criterion to prevent casing string collapse by hydrostatic pressure of the drilling mud remained in the annular space. An example of dependency of the maximum permitted length of empty space in the casing string on its mechanical strength and its wall thickness, calculated by means of a computer program, is represented.

Mini Washing Machine

Abstract: Day to day the demand of washing clothes is increased. In order to meet the demand, we are finding so many ways along with, it is very necessary to provide compact washing machines due to due rise in prices in the market. As there are many problems with space, this system plays an important role by offering a round plastic container as the main washing machine. Bond Tithe and Metal Sheet together provide improved structural stability and durability. During the spin cycle, the Spinner mechanism effectively drains water by using a High-Speed 12V DC Motor enclosed within a Rectangular Plastic Tub. Notably, an I.V. Infusion Set is repurposed, illustrating a resourceful approach to component sourcing. The prototype's complete success and its ability to spin and wash clothes efficiently prove the design's effectiveness. Space limits in urban areas are met by the small size, which is made possible by careful choice of components and materials. In general, the developed Mini Washing Machine presents an effective solution to little laundry requirements, showing an effortless combination of inexpensive components and innovative design.

乡村振兴战略下农产品跨境电商赋能乡村特色产业的研究

China is an agriculture-based country with vast rural areas, a wealth of agricultural products, and a large market. Cross-border e-commerce offers support for the export of agricultural products, which can break through the limitations of time and space, shorten the trade process of agricultural products, enhance the export efficiency of agricultural products, stabilize agricultural product trade, and promote the transformation and upgrading of China’s e-commerce. It also aids in the construction of a long-term mechanism for e-commerce poverty alleviation and agricultural revitalization. However, research has found that despite the rapid development of China’s crossborder e-commerce for agricultural products, there are still some issues, such as non-uniform quality standards for export agricultural products, information asymmetry, an inadequate cross-national logistics system and level of logistics technology, low levels of after-sales service, and a lack of corresponding professional and technical personnel. To address these issues, this article first introduces the current situation of China’s agricultural product export via cross-border e-commerce, then analyzes the development opportunities, and finally proposes the following solutions: aligning with international standards by establishing strict quality control mechanisms; creating a favorable policy environment, including policy support, resource allocation, and organizational guarantees; continuously improving product quality; focusing on the training of professional talent; and strengthening quality supervision and risk prevention. The aim is to promote the development of cross-border ecommerce for agricultural products, empower rural specialty industries, and support the implementation of the rural revitalization strategy.

Evaluating Clinical Reasoning in Undergraduate Medical Education: The Value of a Virtual Oral Assessment.

Oral assessments are essential components of board certification in numerous fields, as they provide insight into problem-solving capacity and clinical reasoning. The development of clinical reasoning often begins in undergraduate medical education and remains a challenge to assess. We developed a pilot oral assessment to evaluate medical student oral presentations and systematically assess clinical reasoning. This was incorporated into a previously existing cumulative assessment at the conclusion of the third year of medical school, with the intent to demonstrate feasibility and future reliability of this exam format. This pilot oral assessment was developed using content taught during third year clerkships. A modified Assessment of Reasoning Tool (ART) was used as the evaluation metric. It was conducted virtually to include faculty members from multiple disciplines and accommodate schedules and space limitations. A total of 152 third year medical students completed the exam, with a total of 15 faculty examiners. 89% of medical students scored as complete in hypothesis directed history, 93% in problem representation, 86% in prioritized differential diagnoses, and 67% in effectively directing management. Most examiners felt an oral assessment is effective to determine a medical student's clinical reasoning ability. Virtual oral assessments of clinical reasoning can be incorporated in undergraduate medical education to identify students struggling with components of clinical reasoning, while also allowing maximum flexibility for the clinician educator workforce as examiners. Longitudinal use of these exams would be valuable to track the development of clinical reasoning across the medical school curriculum.

Beyond Fictionality

According to Gérard Genette, frame narratives are one of few reliable textual markers of fictionality. While very different from the corpus studied by Genette, al-Tanūkhī’s (d. 384/994) compilation al-Faraj baʿd al-shidda includes many anecdotes featuring at least one instance of narrative framing, as well as many more anecdotes told on a single narrative level (after the usual introductory chain of transmitters). As such, the compilation presents a good case study for the link between fictionality and narrative levels in a premodern Arabic context. On the strength of many examples drawn from the compilation, this article describes three uses of frame narratives in the Faraj and argues that even if some of the compiled material thematizes questions of reports’ plausibility (rather than “fictionality”), narrative levels are not a reliable marker of stories considered to be more implausible. One use of the frame narrative in the Faraj is indeed in addressing a report’s plausibility (1), but other anecdotes achieve this without any such framing. Moreover, frame narratives also take on other functions whereby they neither flag nor are reliably associated with a story’s lesser plausibility. Such functions include anchoring a story’s narration within a familiar situation and highlighting the message of a narrative by setting up parallels between its different levels (2). Another function is to negotiate the incorporation of less familiar voices and content, remote in social milieu or geography from al-Tanūkhī’s life, into the world of the compilation (3). These different uses show that frame narratives are not reliable markers of fictionality in the Faraj, and that they were not artificially affixed onto the Faraj’s less plausible plots. Instead, they served different functions, introducing a wide variety of content and shaping the reception of stories by questioning their plausibility, yes, but also by exploiting and manipulating readers’ expectations, and by pushing the limits of spaces and perspectives incorporated into the Faraj’s overall message of deliverance after hardship. Key words: Frame narratives, fictionality, plausibility, foreignness, al-Tanūkhī, al-Faraj baʿd al-shidda, compilation, Abbasid literature.

Feasibility and constraints of Bragg peak FLASH proton therapy treatment planning.

FLASH proton therapy (FLASH-PT) requires ultra-high dose rate (≥40 Gy/s) protons to be delivered in a short timescale whilst conforming to a patient-specific target. This study investigates the feasibility and constraints of Bragg peak FLASH-PT treatment planning, and compares the in silico results produced to plans for intensity modulated proton therapy (IMPT). Bragg peak FLASH-PT and IMPT treatment plans were generated for bone (n=3), brain (n=3), and lung (n=4) targets using the MIROpt research treatment planning system and the Conformal FLASH library developed by Applications SA from the open-source version of UCLouvain. FLASH-PT beams were simulated using monoenergetic spot-scanned protons traversing through a conformal energy modulator, a range shifter, and an aperture. A dose rate constraint of ≥ 40 Gy/s was included in each FLASH-PT plan optimisation. Space limitations in the FLASH-PT adapted beam nozzle imposed a maximum target width constraint, excluding 4 cases from the study. FLASH-PT plans did not satisfy the imposed target dose constraints (D95% ≥ 95% and D2%≤ 105%) but achieved clinically acceptable doses to organs at risk (OARs). IMPT plans adhered to all target and OAR dose constraints. FLASH-PT plans showed a reduction in both target homogeneity (p < 0.001) and dose conformity (non-significant) compared to IMPT. Without accounting for a sparing effect, IMPT plans were superior in target coverage, dose conformity, target homogeneity, and OAR sparing compared to FLASH-PT. Further research is warranted in treatment planning optimisation and beam delivery for clinical implementation of Bragg peak FLASH-PT.

GENERALIZED THERMAL OPTIMIZATION METHOD FOR THE PLATE-FIN HEAT SINKS OF HIGH LUMEN LIGHT EMITTING DIODE ARRAYS

The performance of high-lumen light-emitting diode (LED) arrays is strongly affected by high temperatures. For better performance, the design of better thermal management techniques is required. In this work, an analytical thermal optimization algorithm for the passive heat sinks of high-lumen LED arrays is presented. With the aid of this algorithm, a broader range of heat sink geometry alternatives can be explored for the identification of the optimal heat sink design. This task is challenging using experimental or numerical techniques. The results demonstrate that the algorithm yields design with a reduction of more than 30% in base temperatures compared to previous heat sink design studies when minimum mass and maximum total efficiency constraints are applied. For devices with high powers, small chip spacing, and space limitations in the horizontal axis where base temperatures cannot be further reduced using these constraints, minimum temperature optimization can result in up to a 17% reduction in base temperatures. This reduction in base temperatures significantly improves the junction temperatures and the overall lighting quality of the LEDs.

ENIGMA: A Web Application for Running Online Artificial Grammar Learning Experiments.

Artificial grammar learning (AGL) is an experimental paradigm frequently adopted to investigate the unconscious and conscious learning and application of linguistic knowledge. This paper will introduce ENIGMA ( https://enigma-lang.org ) as a free, flexible, and lightweight Web-based tool for running online AGL experiments. The application is optimized for desktop and mobile devices with a user-friendly interface, which can present visual and aural stimuli and elicit judgment responses with RT measures. Without limits in time and space, ENIGMA could help collect more data from participants with diverse personal and language backgrounds and variable cognitive skills. Such data are essential to explain complex factors influencing learners' performance in AGL experiments and answer various research questions regarding L1/L2 acquisition. The introduction of the core features in ENIGMA is followed by an example study that partially replicated Chen (Lang Acquis 27(3):331-361, 2020) to illustrate possible experimental designs and examine the quality of the collected data.

Exploring Healthcare Providers' and Women's Perspectives of Labor Companionship during Childbirth: An Interpretative Phenomenological Analysis Study.

A labor companion of choice during childbirth is crucial for improving women's birth experience and confidence to give birth. Labor companions provide various benefits, including enhanced communication, emotional support, non-pharmacological pain relief, and better healthcare. However, little is known about the supportive actions of labor companions with respect to women's needs during labor and birth, as well as healthcare providers' perceptions of labor companions. Therefore, this study was conducted to explore the perceptions of healthcare providers and women regarding labor companions. The study utilized an interpretative phenomenology research design. Data collection involved conducting semi-structured interviews with 14 participants. The sample consisted of mothers, physicians, and nurses, ensuring a diverse range of perspectives. An interpretative phenomenological analysis was conducted for data analysis. Five themes were identified: (a) impact of companionship, (b) benefits for healthcare providers, (c) companion roles, (d) loneliness and alienation of mothers, and (e) challenges of implementation. The findings indicated that the presence of a companion reduces the need for unnecessary medical interventions and eases the workload of healthcare providers. Without a companion, mothers often feel lonely and disconnected during the birthing process. The presence of companions is often hindered by space limitations in delivery rooms, the absence of clear policies, and lack of childbirth education programs for companions. Clear policies, education programs, and adequate space are essential for implementing and promoting labor companionship during childbirth.

A hybrid terrain data compression method in unity for deployment on resource-limited devices

With geographic information systems in general and simulation systems in particular, terrain data takes up most of the hard drive space and is often deployed on data servers. The higher the resolution of the terrain data, the more detailed it is, the larger the space occupied on the hard drive. If terrain data needs to be deployed offline on resource-limited devices such as minicomputers, it will face many difficulties due to hard drive space limitations. Terrain data compression is a solution that reduces terrain capacity to overcome that problem. This article presents an efficient hybrid approach based on Brotli and LZ4 compression algorithms to compress terrain data for deployment on resource-limited devices. Experimental results show that the proposed method significantly reduces the volume of terrain data compared to using each component algorithm independently while still ensuring quality.

Research on Innovative Dissemination Models of Nantong’s Intangible Cultural Heritage under the Background of Big Data

Intangible cultural heritage is a product of human society’s spiritual civilization and a precious wealth left by history, carrying the wisdom of mankind and the civilization and splendour of human history. Nowadays, in the era of the development of cultural diversity, with the rise of a new generation of technologies such as Big Data and Artificial Intelligence, the audience of cultural heritage breaks the limitations of time and space, while the means and paths for the protection and inheritance of cultural heritage are becoming richer and richer. By summarizing the connotations and characteristics of intangible heritage, sorting out the changes and developments in its transmission methods, analyzing the opportunities for the dissemination of intangible heritage in the digital age, examining the challenges faced by Nantong’s intangible cultural heritage in its dissemination, and combining current hot topics, this study proposes new paths for the dissemination of intangible heritage in the digital era in Nantong. The aim is to achieve efficient and widespread transmission from multiple angles, providing new ideas for cultural construction and cultural identification.

Digital Technology: Research on the Construction and Application of Blended Teaching Curriculum of Practical Physical Education Classroom Teaching Skills in the Big Data Background

Big data is bringing discipline to education. Under the guidance of digital technology, education has ushered in the upsurge of digital reform, digital course teaching has gradually entered the public's vision, and the upsurge of digital course open education is coming. The paper adopts the research methods of literature, field investigation and logical analysis, and takes the construction of digital curriculum mixed teaching course based on the platform of Superstar Learning as the research object. This paper constructs the curriculum construction ideas in three stages of "pre-class, mid-class and after-class", and draws the following conclusions through the research of blended teaching curriculum practice in the big date background: Build digital media teaching resource library, record multi-platform online teaching videos, practice dual-track mixed teaching, pre-set interactive classroom teaching activities, after-school homework to consolidate and improve classroom learning, online examination to achieve teaching effect evaluation and feedback, etc. And summed up four practical experiences of multi-style one-click check-in function to help class attendance, interactive teaching activity function to achieve subject participation, paperless online evaluation function to detect learning effect, digital courses to break the limitation of time and space. Digital technology improves the convenience of course teaching and forms a visual teaching effect. Digital technology provides new ideas for digital curriculum teaching. The existence of digital curriculum provides more possibilities for personalized learning, while hybrid teaching promotes the interaction and cooperation between students and teachers. Build an online learning platform based on big data to support computer technology, and guide students to conduct simulation and practice in the teaching process.

Renovating House Church Assumptions

Missiologists have often claimed that early Christian house churches could not have surpassed 15-30 people. The argument often centers on two prongs—persecution and space. Persecution kept house churches relatively small to avoid visibility. The size of Greco-Roman houses kept churches relatively small due to space limitations. For some missiologists, these limitations became advantageous and led to rapid multiplication as the church grew "sideways." This article questions both of these assumptions and instead provides evidence that early Christian churches could and did embrace several models based on their particular context.

Study on the effect law of jet angle on the cooling of hot-rolled L-beam

The uniformity of cooling affects the organizational properties and product quality of the L-beam. Problems such as bending deformation of the L-beam and excessive residual stresses inside the finished product are mainly caused by uneven cooling. The jet angle is an important cooling parameter in the cooling process of L-beam. In this study, the flow field and cooling law during jet cooling of hot-rolled L-beams were investigated by means of numerical simulation using the jet angle as a variable. The jet angle is −45°∼30° on the lower surface of the short edge of the L-beam due to space limitation, and the jet angle is −45°∼45° on the rest of the parts, and the other process parameters are kept unchanged. The velocity distribution, pressure, water flow, and temperature distribution on the cooling surface and the average heat transfer coefficient were analyzed. The results show that the jet angle has a significant effect on the cooling of each part of the L-beam. With the increase of the jet angle, the asymmetry of water velocity, pressure distribution, water flow distribution, and temperature distribution on the surface of the cooling surface increased significantly. The distribution of heat flux corresponds well to the distribution of temperature. As the jet angle increases the surface average heat transfer coefficient gradually decreases, and the maximum average heat transfer coefficient appears in the vertical jet. Gravity will also have a certain effect on the cooling of the L-beam.

Demystifying the Emergence Proposal

We revisit the Emergence Proposal in the vector multiplet moduli space of type IIA N = 2 supersymmetric string vacua in four dimensions, for which the string tree-level prepotential and the string one-loop correction are exactly known via mirror symmetry. We argue that there exists an exact notion of emergence, according to which these four-dimensional couplings can be computed exactly in any asymptotic limit in field space. In such limits, a perturbative quantum gravity theory emerges, whose fundamental degrees of freedom include all complete infinite towers of states with typical mass scale not larger than the species scale. For a decompactification limit, this picture is closely related to and in fact motivated by the computation of Gopakumar-Vafa invariants. In addition, in the same limit our results suggest that the emergent theory will also contain asymptotically tensionless wrapped NS5-branes.

Efficacy of a virtual nursing simulation-based education to provide psychological support for patients affected by infectious disease disasters: a randomized controlled trial.

Virtual simulation-based education for healthcare professionals has emerged as a strategy for dealing with infectious disease disasters, particularly when training at clinical sites is restricted due to the risk of infection and a lack of personal protective equipment. This research evaluated a virtual simulation-based education program intended to increase nurses' perceived competence in providing psychological support to patients affected by infectious disease disasters. The efficacy of the program was evaluated via a randomized controlled trial. We recruited 104 nurses for participation in the study and allocated them randomly and evenly to an experimental group and a control group. The experimental group was given a web address through which they could access the program, whereas the control group was provided with a web address that directed them to text-based education materials. Data were then collected through an online survey of competence in addressing disaster mental health, after which the data were analyzed using the Statistical Package for the Social Sciences(version 23.0). The analysis showed that the experimental group's disaster mental health competence (F = 5.149, p =.026), problem solving process (t = 3.024, p =.003), self-leadership (t = 2.063, p =.042), learning self-efficacy (t = 3.450, p =.001), and transfer motivation (t = 2.095, p =.039) significantly statistically differed from those of the control group. A virtual nursing simulation-based education program for psychological support can overcome limitations of time and space. The program would also be an effective learning resource during infectious disease outbreaks. This Korean clinical trial was retrospectively registered (21/11/2023) in the Clinical Research Information Service ( https://cris.nih.go.kr ) with trial registration number KCT0008965.