bluuebunny/crossref_metadata_2025_split huggingface dataset:
Discrete element simulation study on effects of grain preferred orientation on micro-cracking and macro-mechanical behavior of crystalline rocks
Authors: Hu Yunpeng , Zhang Zhuorui , Yan Zhiwei , Dong Yucang , Zhu Yongquan , Xia Zhenrong , Yan Zhenwei , Guo Tongda , Long Wanxue 
Published: March 2024

Abstract
Grain-preferred orientation significantly influences the brittle fracture mechanism and failure mode of crystalline rocks. However, current grain-based models (GBMs) based on particle flow code (PFC) software are mostly proposed on the basis of the Voronoi tessellation method for grain boundary generation, which is difficult to simulate the heterogeneity of microstructure such as shape and orientation of rock minerals. To study the effect of grain-preferred orientation on macroscopic mechanical properties and microscopic characteristics of crystalline rocks, a novel grain-based microstructure transformation method (MTM) is proposed. Based on the MTM, a GBM with a target aspect ratio and crystal orientation is obtained by transforming the Voronoi crystal geometry through a planar coordinate mapping. Specifically, embedded FISH language is used to control random mineral seed size and distribution pattern to generate Tyson polygons. A polygon geometry that satisfies the rock texture is obtained as a grain boundary by spatially transforming the vertex of the Tyson polygon. The transformed complex geometry is taken as the crystal structure of the GBM, and the Lac du Bonnet granite models with different aspect ratios and crystal orientations were developed in PFC2D. Finally, a series of unconfined compressive strength tests are performed in PFC2D to verify the proposed modeling methods for the geometric variation of the crystals and to study the effects of the preferred orientation of the grains on the macroscopic mechanical properties and microscopic fracture mechanisms of the crystalline rocks from different perspectives.
PP2B-dependent cerebellar plasticity sets the amplitude of the vestibulo-ocular reflex during juvenile development
Authors: Wu Bin , Post Laura , Lin Zhanmin , Schonewille Martijn 
Published: March 2024

Throughout life, the cerebellum plays a central role in the coordination and optimization of movements, using cellular plasticity to adapt a range of behaviors. Whether these plasticity processes establish a fixed setpoint during development, or continuously adjust behaviors throughout life, is currently unclear. Here, by spatiotemporally manipulating the activity of protein phosphatase 2B (PP2B), an enzyme critical for cerebellar plasticity, in male and female mice, we examined the consequences of disrupted plasticity on the performance and adaptation of the vestibulo-ocular reflex (VOR). We find that, in contrast to Purkinje cell specific deletion starting early postnatally, acute pharmacological as well as adult-onset genetic deletion of PP2B affects all forms of VOR adaptation, but not the level of VOR itself. Next, we show that Purkinje cell-specific genetic deletion of PP2B in juvenile mice leads to a progressive loss of the protein PP2B and a concurrent change in the VOR, in addition to the loss of adaptive abilities. Finally, re-expressing PP2B in adult mice that lack PP2B expression from early in development, rescues VOR adaptation, but does not affect the performance of the reflex. Together, our results indicate that chronic or acute, genetic or pharmacological block of PP2B disrupts the adaptation of the VOR. In contrast, only the absence of plasticity during cerebellar development affects the setpoint of VOR, an effect that cannot be corrected after maturation of the cerebellum. These findings suggest that PP2B-dependent cerebellar plasticity is required during a specific period to achieve the correct setpoint of the VOR.Significance StatementEarly damage to motor adaptation structures, such as the cerebellum, has been linked to neurodevelopmental disorders persisting into adulthood. Understanding these long-term effects requires disentangling the persistent effects of disrupted development from the acute effects directly caused by the continuous presence of the disruption. Here, we use the vestibulo-ocular reflex (VOR) to demonstrate that disruptions during early development affect both basal level and adaptation, whereas adult-onset disruption of cerebellar plasticity only affects the ability to adapt, not the setpoint of the reflex. Our findings that specifically the absence of plasticity during cerebellar development affects the setpoint of the VOR, which cannot be corrected by re-instating plasticity after maturation, supports the concept of a sensitive developmental period for setting cerebellum-controlled reflexes.
The Effect of Jump Rope Training Program on the Agility in Deaf Children SLB-B Yayasan Pendidikan Tunas Bangsa (YPTB) Malang City
Authors: Pribadi David Rinekso , Raharjo Slamet , Andiana Olivia 
Published: March 2024

Deaf children are those who have lost or suffered from hearing impairment since birth or before the age when their language development is fully formed. One aspect of physical fitness is agility. Through appropriate agility exercises, deaf children can enhance their ability to feel more confident in engaging in physical activities. Jump rope exercises involve coordinated body movements that can help deaf children develop agility, muscle strength, and motor coordination. A pre-experimental approach is used in this quantitative research, and the research design employed is a one-group pretest-posttest. The sample studied consisted of 30 deaf children in grades 3-6 in elementary school. The research indicates that jump rope exercises have a positive impact, leading to an increase in agility in deaf students at SLB-B Yayasan Pendidikan Tunas Bangsa , Malang City. The paired sample t-test results show a significance value of 0.001. The conclusion is that jump rope training has an impact on the agility of deaf students at SLB-B YPTB Malang City, as evidenced by the increase in scores in the post-test.
Efecto del suplemento Insulina-Transferrina-Selenio (ITS) sobre la tasa de desarrollo y calidad de embriones bovinos in vitro
Authors: Acosta Lobo Mariano Eliécer , Robledo Salgado Pablo Andrés , Londoño Franco Luis Fernando , Torres Osorio Viviana Andrea , Vásquez Araque Neil A. 
Published: March 2024

The aim of this study was to evaluate the effect of Insulin-Transferrin-Selenium (ITS) supplementation in embryo culture on the blastocyst rate and embryo quality. The bovine zygotes obtained by in vitro maturation (MIV) and fertilization (IVF) were transferred to Evolve medium in 4 groups (T1: Without ITS supplement; T2: ITS the first 48 h of culture (CIV1): T3: ITS after day 2 of culture (CIV2), T4: ITS during all culture time (CIV1 + CIV2). All procedures were performed at 38.5 °C, 5% CO2 and 90% relative humidity. The cleavage and blastocyst rates were determined at 48 h and day 8 of culture. The total cell number and the production of reactive oxygen species (ROS) in the expanded blastocysts were determined by staining the nucleus with Hoechst and the oxidation of the fluorescent probe dichlorodihydrofluorescein diacetate (H2DCFDA). The T4 cultured embryos presented the highest rate of blastocysts (32.6%) and total cell number (145.6) compared to the control group without STI (26.2% and 98.6, respectively; p<0.05). Likewise, the production of ROS in T4 blastocysts was lower (p<0.05) than that obtained in the other study groups. The results show that the addition of the ITS supplement throughout the embryo culture time has beneficial effects on the percentage of blastocysts and embryo quality, assessed by the number of total cells and the production of ROS.
The Student Movement at the University of Buenos Aires during the Last Military Dictatorship in Argentina (1976-1983)
Authors: Seia Guadalupe Andrea 
Published: March 2024

En el presente artículo analizo la reorganización del movimiento estudiantil universitario argentino durante la última dictadura militar (1976–1983). En el marco de la Guerra Fría en Latinoamérica, la juventud universitaria con militancia política fue un blanco predilecto del plan represivo sistemático perpetrado por las Fuerzas Armadas luego del golpe de Estado de 1976. Aquí describo cómo y por qué los y las estudiantes procuraron continuar o comenzar con una militancia universitaria a pesar del terrorismo de Estado desplegado sobre las universidades. A partir de la reconstrucción empírica mediante fuentes documentales primarias y secundarias, así como testimonios de activistas estudiantiles en la Universidad de Buenos Aires durante el período seleccionado, presentamos tres subetapas en el proceso de reorganización estudiantil con sus particularidades y continuidades. Explicamos cómo las y los activistas recurrieron a diferentes tipos de convocatorias (recreativas, culturales y políticas), así como a reivindicaciones y formas de organización históricas del movimiento estudiantil argentino ancladas en la herencia de la Reforma Universitaria de 1918, para construir e instalar en la arena pública una agenda propia contra la política universitaria vigente. El movimiento estudiantil universitario sobrevivió a la última dictadura con cambios notables, pero también continuidades, y se constituyó como un actor político respetable y de notoriedad pública en el marco de la transición democrática.
π-Light: Programmatic Interpretable Reinforcement Learning for Resource-Limited Traffic Signal Control
Authors: Gu Yin , Zhang Kai , Liu Qi , Gao Weibo , Li Longfei , Zhou Jun 
Published: March 2024

The recent advancements in Deep Reinforcement Learning (DRL) have significantly enhanced the performance of adaptive Traffic Signal Control (TSC). However, DRL policies are typically represented by neural networks, which are over-parameterized black-box models. As a result, the learned policies often lack interpretability, and cannot be deployed directly in the real-world edge hardware due to resource constraints. In addition, the DRL methods often exhibit limited generalization performance, struggling to generalize the learned policy to other geographical regions. These factors limit the practical application of learning-based approaches. To address these issues, we suggest the use of an inherently interpretable program for representing the control policy. We present a new approach, Programmatic Interpretable reinforcement learning for traffic signal control (π-light), designed to autonomously discover non-differentiable programs. Specifically, we define a Domain Specific Language (DSL) and transformation rules for constructing programs, and utilize Monte Carlo Tree Search (MCTS) to find the optimal program in a discrete space. Extensive experiments demonstrate that our method consistently outperforms baseline approaches. Moreover, π-Light exhibits superior generalization capabilities compared to DRL, enabling training and evaluation across intersections from different cities. Finally, we analyze how the learned program policies can directly deploy on edge devices with extremely limited resources.
Review-Enhanced Hierarchical Contrastive Learning for Recommendation
Authors: Wang Ke , Zhu Yanmin , Zang Tianzi , Wang Chunyang , Jing Mengyuan 
Published: March 2024

Designed to establish potential relations and distill high-order representations, graph-based recommendation systems continue to reveal promising results by jointly modeling ratings and reviews. However, existing studies capture simple review relations, failing to (1) completely explore hidden connections between users (or items), (2) filter out redundant information derived from reviews, and (3) model the behavioral association between rating and review interactions. To address these challenges, we propose a review-enhanced hierarchical contrastive learning, namely ReHCL. First, ReHCL constructs topic and semantic graphs to fully mine review relations from different views. Moreover, a cross-view graph contrastive learning is used to achieve enhancement of node representations and extract useful review knowledge. Meanwhile, we design a neighbor-based positive sampling to capture the graph-structured similarity between topic and semantic views, further performing efficient contrast and reducing redundant noise. Next, we propose a cross-modal contrastive learning to match the rating and review representations, by exploring the association between ratings and reviews. Lastly, these two contrastive learning modes form a hierarchical contrastive learning task, which is applied to enhance the final recommendation task. Extensive experiments verify the superiority of ReHCL compared with state-of-the-arts.
HYDROLOGICAL ANALYSIS OF THE CIKAPUNDUNG WATERSHED, TAMANSARI BALUBUR AREA OF BANDUNG, WEST JAVA, INDONESIA
Authors: Rohmat Rohmat , Akbardin Juang , Maknun Johar 
Published: March 2024

AbstractCikapundung River is one of the rivers that divide Bandung City which functions as the city's main drainage, the general use of Cikapundung River water is for drinking water (PDAM Dago Pakar and PDAM Badak Singa), hydropower (Pakar and Cilengkung), and irrigation. The number of activities and utilization of the Cikapundung river in quantity is at risk of causing flooding which is influenced by various factors. Therefore, it is necessary to analyze the flood discharge to determine the value of the planned flood discharge in the Cikapundung River. The purpose of this study was to analyze flood discharge using empirical methods on the Cikapundung river in the Tamansari area in the context of flood control efforts. The analysis carried out is a hydrological analysis which includes an analysis of maximum rainfall using the frequency distribution method type Gumbel, Haspers, Weduwen, and Log Pearson, and a design flood discharge analysis using the Rational Method. Based on the results of the analysis of the highest discharge, Rational Gumbel with a return period of 2 years 5,076 m3/s, a return period of 5 years 8,371 m3/s, a return period of 10 years 10,553 m3/s, a return period of 20 years 12,645 m3/s, 25 year return period 13,097 m3/s, 50 year return period 15,354 m3/s, 100 year return period 17,384 m3/s, 150 year return period 518,395 m3/sec. Efforts that can be made in flood control efforts are restoration or rearrangement of the environment around the Cikapundung river border. Keywords: Cikapundung Watershed Hydrological Analysis, Flood Discharge Analysis, Empirical Method
DEVELOPMENT OF WEBSITE-BASED LEARNING MEDIA ON BASIC COMPETENCIES OF TUBER PROCESSING
Authors: Fadilah Firda , Handayani Sri , Azizah Dewi Nur 
Published: March 2024

Learning that takes place online during a pandemic makes the learning process more challenging because of the difficulty of conditioning the learning process. The role of learning media is important to make learning more interesting which is expected to improve student learning outcomes. This study aims to determine the feasibility of website-based learning media on the basic competence of tubers processing. The development of this website-based learning media uses the ADDIE method which consists of five stages, namely: (1) Analysis; (2) Design (Design); (3) Development (Development); (4) Implementation, and (5) Evaluation. Keywords: ADDIE, learning media, website.
DESIGN OF STEEL STRUCTURE ELEMENTARY SCHOOL BUILDING SDN 05 PAGI IN CIBUBUR
Authors: Widyaningrum Putri Ayu , Mentari Sekar 
Published: March 2024

Abstract—The compressive strength of concrete can be used to increase the strength of steel beams, especially in the positive moment region. From the composite action that occurs it is expected to reduce the size of the steel profile to be used. This thesis compiles a plan using Composite Steel Beams and End Plate Connections, using the SAP2000v23 program for static calculations, and calculation of beam and column dimensions as well as connection and base plate planning. To analyze the dimensions of the required WF Steel Profiles for Columns, Composite Beams, beam-column connections, main beams-joists, and floor slabs. From the analysis results, the dimensions for main beams are WF 400x200x8x13 and WF 450x200x9x14, for joists using WF 300x150x8x13, and for columns using WF 350x350x12x19. The design of the connection on the flanged beams uses an End Plate with a plate thickness of 18 mm and the number of bolts is 8 Ø 24 mm. The connection design for the web beam-column connection uses an End Plate with a thickness of 10 mm and a total of 8 Ø 20 mm bolts. The connection design for the main beam-subbeam and the joist beams uses an angled profile of 80x80x8 and the number of bolts is 4 Ø 22 mm. The required base plate size is 550x550x45mm using 8 Ø 19 mm anchors with a length of 800 mm. Keywords : Steel Structure, Composite, SAP2000v23
An Analysis of the Impact of Social Media and Search Engines on Decision-Making
Authors: Petrone Angela 
Published: March 2024

With the constant advancement of technology and the advent of a global pandemic, as of 2023 it is safe to say our lives are as affected by our physical surroundings as they are by the virtual spaces we inhabit.
Social media and search engines constitute a big part of how people use technology to aid in their decision-making processes. The current state of social media and search engines regulation in the United States is one of stall: while public discourse continues and concerns among experts keep raising at each iteration of existing platforms or introduction of new tools, policymakers have not made as much progress in regulating the actions of the companies owning these platforms, in spite of their awareness of the impact these tools have on the public’s decision-making abilities. In this context, the spread of dis- and mis- information is a particularly dangerous phenomenon that can only be tackled with a radical change in the way platform owners are held accountable for the content they allow the circulation of.
This study aims to serve as a much needed reminder of the effects of social media and search engines usage on the public’s agency, decision-making processes, and ultimately the real-life consequences of the exposure to and interaction with online misinformation and disinformation.
A specific focus on how Covid-19 disinformation (false information which is deliberately intended to mislead) and misinformation (false or inaccurate information) spreading on two specific platforms (Reddit, and Google) was handled by said platforms will serve as a magnifying glass on the aforementioned issues. Analyzing the prominent design and ethics concerns in this landscape, I intend to propose heuristics to inform policy-oriented solutions to a set of issues that has been largely misunderstood and underestimated at the policy level in the United States. I argue that these concerns will only increase in complexity if left untackled, and the introduction of Artificial Intelligence (AI) tools to the public might have already exponentially complicated the position of the United States’ governmental entities; while explicitly clarifying their intention to insure people’s well-being, governmental bodies are struggling with either understanding the policy/regulatory options available to them or getting them passed. The influence of the lobbying power of tech companies and governments' conflicts of interests in the matter will be discussed.
Selección de socios y resultado de los equipos emprendedores: ¿Debería quedar todo en familia?
Authors: Aparicio Sebastián , Montero Javier 
Published: March 2024

La visión del emprendedor como un héroe solitario es común en la sociedad. Sin embargo, muchos negocios nuevos son creados por equipos. De hecho, los negocios emprendidos en equipo tienen mayores probabilidades de obtener beneficios, sobrevivir en el mercado y crecer rápidamente que los emprendidos en solitario. Pero para lograr un mejor resultado a la hora de emprender, no basta con decidir formar un equipo, sino que es necesario también decidir con quién asociarse. Además, siendo la familia un contexto en el cual buscar socios potenciales para formar equipos emprendedores, resulta clave tener en cuenta cómo influye la composición del equipo emprendedor en el caso de nuevos negocios familiares. Este artículo pretende responder a estas cuestiones a partir de lo que dicen la teoría y los datos con el fin de ofrecer orientaciones prácticas para quienes se encuentran iniciando nuevos negocios. En este sentido, hacer una selección cuidadosa del equipo es fundamental, teniendo en cuenta los equipos emprendedores familiares pueden tener algunas limitaciones que hay que considerar.
Recibido: 14 de junio de 2023Aceptado: 28 de agosto de 2023
PENGARUH BRAND AMBASSADOR DAN SOCIAL MEDIA INSTAGRAM @NPUREOFFICIAL TERHADAP KEPUTUSAN PEMBELIAN PRODUK NPURE
Authors: Remares Rizqia Luthfiana  
Published: March 2024

Perkembangan teknologi memungkinkan manusia untuk berkomunikasi, berinteraksi, bekerjasama, berbagi, dan membentuk ikatan sosial, sehingga untuk menghadapi persaingan bisnis di tengah perkembangan teknologi, penggunaan brand ambassador dan social media menjadi strategi pemasaran yang efektif dalam promosi dan menarik konsumen untuk melakukan pembelian. Brand ambassador Npure Afgansyah Reza dan Isyana Sarasvati merupakan media yang digunakan oleh perusahaan untuk berkomunikasi serta terhubung dengan publik dengan harapan penjualan akan meningkat dengan promosi memanfaatkan popularitas brand ambassador, ketika brand ambassador menggunakan produk, atau memberikan informasi melalui social media. Social media Instagram @npureofficial digunakan sebagai referensi sumber informasi terkait produk Npure sehingga akan menimbulkan ketertarikan untuk melakukan keputusan pembelian. Penelitian ini menggunakan pendekatan kuantitatif eksplanatif dan teori yang relevan dengan penelitian ini adalah teori Stimulus-Organism-Response. Objek yang digunakan adalah brand ambassador Npure yaitu Afgansyah Reza dan Isyana Sarasvati serta social media Instagram @npureofficial. Data yang dikumpulkan pada penelitian ini diperoleh dengan menggunakan kuesioner yang disebarkan kepada 100 responden yang berasal dari followers akun instagram @npureofficial. Analisis data dalam penelitian ini menggunakan metode regresi linear berganda, kemudian dilakukan uji t dan uji f serta koefisien determinasi. Hasil penelitian ditemukan bahwa brand ambassador dan social media terbukti secara parsial dan simultan dapat meningkatkan keputusan pembelian produk Npure. Pengaruh yang diberikan oleh brand ambassador dan social media sebesar 61,3% dan sisanya 38,7% merupakan konstribusi dari variabel lain yang tidak diteliti pada penelitian ini.