bluuebunny/crossref_metadata_2025_split huggingface dataset:
Exploring learning outcomes, communication, anxiety, and motivation in learning communities: a systematic review
Authors: Cao Wenwen , Yu Zhonggen 
Published: November 2023

AbstractLearning communities have become a focal point of research due to their potential impact on learning outcomes, motivation, and communication. These factors are recognized as crucial determinants of the effectiveness of learning communities. To guide this study, a thorough review of 35 relevant studies was conducted, employing rigorous inclusion and exclusion criteria based on the PRISMA framework to ensure a systematic and robust approach. The findings of this study indicated that learning communities possess the capacity to enhance communication, motivation, and learning outcomes, while simultaneously alleviating learner anxiety. Specifically, it was observed that well-designed online learning communities can significantly improve learning outcomes. Furthermore, the utilization of online technologies within these communities can facilitate enhanced communication, leading to improved learning outcomes. Moreover, this study offers a range of recommendations for optimizing learning outcomes through the implementation of learning communities. These recommendations serve as valuable guidance for harnessing the full potential of learning communities to achieve educational goals. In conclusion, this study underscores the importance of learning communities in enhancing learning outcomes, motivation, and communication. It highlights the efficacy of appropriately designed online communities and the integration of technology in fostering effective communication and improving learning outcomes. The study contributes important insights into ways of maximizing the benefits of learning communities in promoting educational success.
The impact of automation and optimization on customer experience: a consumer perspective
Authors: Gavrila Gavrila Sorin , Blanco González-Tejero Cristina , Gómez Gandía José Andrés , de Lucas Ancillo Antonio 
Published: November 2023

AbstractThe adoption of digital technologies has significantly transformed businesses and society as a whole. The automation of tasks is leading to changes in organizational structures and strategies. Due to technological growth, users are able to identify the benefits and risks that technology can entail in the purchasing process. Specifically, robotic process automation (RPA) can improve efficiency and agility in a company, which in turn can positively impact consumer satisfaction and engagement. However, automation can also negatively affect the consumer experience and service quality if not applied correctly. Therefore, this research focuses on analyzing the impact of automation technologies on purchasing processes and consumer satisfaction. For this purpose, a survey was developed by means of the Likert 5-point scale, which allowed for obtaining 215 valid responses from consumers in the Community of Madrid. The data were processed through the SPSS tool, which enabled the analysis of the data and the proposed model. Consequently, the results show that potential RPA-based automation and optimization of processes can be of great utility for businesses to better address investment for improving consumer satisfaction. In addition, it should be highlighted that this research contributes in an original way to the area of information and communication technologies by allowing for the development of proactive technological implementation plans that consider end-user satisfaction.
EU countries’ digital transformation, economic performance, and sustainability analysis
Authors: Bocean Claudiu George , Vărzaru Anca Antoaneta 
Published: November 2023

AbstractDigital transformation generates challenges and opportunities at the individual and organizational levels. Implementing digital technologies impacts all countries’ economic growth and orientation toward sustainability. This paper aims to evaluate the effects of digital transformation on the economic performance and sustainability of European Union (EU) countries. The paper employs artificial neural network analysis, structural equation modeling, and cluster analysis to investigate the relationships among digital transformation, economic performance, and sustainability. Economic performance is measured using GDP per capita, while SDG scores represent sustainability. The use of computers and the Internet in enterprises, the volume of e-commerce, and the percentages of implementing new digital technologies, such as cloud computing, Big Data, and the Internet of Things, illustrate digital transformation. The research findings reveal the extent of digital transformation in each country and the significant influence of digital transformation on economic performance and sustainability. The main drivers of digital transformation are the use of computers and the Internet in enterprises and e-commerce. However, new digital technologies exert increasingly noticeable effects, particularly in developed European countries. This study elucidates the profound implications of digital transformation on economic performance and sustainability. It underscores the pivotal role of digital technologies, especially in advanced European countries, in driving economic growth and sustainability. The results can be helpful to regulators in developing digitization strategies that underpin sustainable economic performance.
Is chemical vapor deposition of monolayer WSe2 comparable to other synthetic routes?
Authors: Choi Soo Ho , Yang Sang-Hyeok , Park Sehwan , Cho Byeong Wook , Nguyen Tuan Dung , Kim Jung Ho , Kim Young-Min , Kim Ki Kang , Lee Young Hee 
Published: November 2023

Chemical vapor deposition (CVD) can produce wafer-scale transition-metal dichalcogenide (TMD) monolayers for the integration of electronic and optoelectronic devices. Nonetheless, the material quality of the CVD-grown TMDs still remains controversial. Here, we compare the quality of representative WSe2 monolayers grown by CVD compared to that obtained by other synthesis methods: bulk-grown-chemical vapor transport (CVT) and flux. Through the use of a deep-learning–based algorithm to analyze atomic-resolution scanning transmission electron microscopy images, we confirm that Se vacancies (VSe) are the primary defects in WSe2, with a defect density of ∼5.3 × 1013 cm−2 in the CVD-grown sample, within the same order of magnitude of other methods (∼3.9 × 1013 cm−2 from CVT-grown samples and ∼2.7 × 1013 cm−2 from flux-grown samples). The carrier concentration in field-effect transistors at room temperature is ∼5.84 × 1012 cm−2 from a CVD-grown sample, comparable to other methods (6–7 × 1012 cm−2). The field-effect mobility of the CVD-grown sample is slightly lower than that of other synthesis methods, together with similar trends in on-current. While the difference in photoluminescence intensity is not appreciable at room temperature, different intensities of defect-related localized states appear below 60 K. We conclude that the wafer-scale CVD-grown samples can be utilized without loss of generality in the integration of electronic/optoelectronic devices.
Optical spectroscopy of the previously unobserved palladium monosulfide (PdS) radical
Authors: Zhang Lei , Zou Wenli , Yu Yao , Yang Jie 
Published: November 2023

The optical spectra of the palladium monosulfide (PdS) molecule in gas phase have been investigated for the first time through laser-induced fluorescence (LIF) and single-vibronic-level (SVL) emission spectroscopies. The I3Σ− − X3Σ− transition system containing 16 vibronic bands was identified in the LIF spectra, covering the energy range of 22 030–23 400 cm−1. The spectra with rotational resolution allowed for the determination of the molecular constants in both the ground X and excited I electronic states, involving the spin–orbit splitting, rotational constant, vibrational frequency, and isotope shift. Isotopically resolved SVL emission spectra permitted the observation of the spin–orbit splitting, vibrational frequency, and vibrational isotope shift of the X3Σ−0+,1 and A3Π2,1,0−,0+ states as they transitioned from the excited I state to the vibrational levels of the X and A states. Ab initio calculations presented plenty of the Λ-S and Ω states of PdS below 28 000 cm−1 and provided strong support for the assignments of the experimental observation.
Tourism Clusters, Nature Research and Visitor Experiences: The Case of Fundación Batis in Barranquilla, Colombian Caribbean
Authors: Solano Beatriz-Helena Díaz , Gardella Narcís Bassols i 
Published: November 2023

Summary
Clusters are beneficial to tourist companies in a number of ways as they have been found to promote innovation of both product and market. The case of Fundación Batis, located in the Colombian Caribbean, will be examined as a best practice in terms of adding tourism to a company’s supply to achieve diversification and supplemental revenue. After a successful incubation in a cluster, this foundation opened its doors to tourists, and its employees now engage in an open dialogue with visitors about conservation issues. As a result, the region gains an upscale offer in natural tourism, which helps to upgrade and diversify the local tourism product.

Information
© The Authors 2023
Dark energy, D-branes and pulsar timing arrays
Authors: Chowdhury Debika , Tasinato Gianmassimo , Zavala Ivonne 
Published: November 2023

Abstract
Several pulsar timing array (PTA)
collaborations recently announced the first
detection of a stochastic
gravitational wave (GW) background, leaving open the question of its source.
We explore the possibility that it originates from cosmic inflation, a guaranteed
source of primordial GW. The inflationary GW background
amplitude is enhanced at PTA scales by a non-standard
early cosmological evolution, driven by Dirac-Born-Infeld (DBI) scalar
dynamics motivated by string theory. The resulting
GW energy density has a broken power-law frequency profile, entering
the PTA band with
a peak amplitude consistent with the recent GW detection.
After this initial DBI kination epoch, the dynamics starts a new phase
mainly controlled by the scalar potential. It provides a realization of an early dark energy scenario aimed
at relaxing the H
0 tension, and a late dark energy model which explains
the current cosmological acceleration with no need of a cosmological constant.
Hence
our mechanism — besides
providing a possible explanation for the recent PTA results —
connects them with testable properties of the physics of the dark universe.
New examples of non-polynomial integrals of two-dimensional geodesic flows
*
Authors: Agapov Sergei , Shubin Vladislav 
Published: November 2023

Abstract
In this paper, we continue to study integrable geodesic flows on 2-surfaces with non-polynomial first integrals which we started earlier in our previous papers. We construct explicitly new local examples of Riemannian metrics and such integrals via various approaches and methods such as the classical and the generalized hodograph methods, the method of separation of variables and some others.
Navigating Awareness: Factors Influencing Students’ Perception of Maritime Environmental Issues in Islamic Education
Authors: Dendi Yuda S , Solihin Muhtar , Murtado Dodo , Rudiana  , Subqi Ahmad , Suhayati Iis 
Published: November 2023

Abstract
This study employs a quantitative approach to explore the factors influencing students’ low awareness and attention to maritime environmental issues and recommends Islamic education management strategies to enhance maritime environmental awareness based on these factors. Given the backdrop of insufficient attention to maritime environmental issues within Islamic educational institutions, this study delves into various aspects related to the integration of maritime environmental concerns into the curriculum, the management of Islamic educational institutions, and the effectiveness of applied strategies. The sample for this study encompasses 80 students and 5 faculty members within the environment of one Islamic educational institution in Kabupaten Tasikmalaya, namely the University of Islam KH. Ruhiat. Data was collected through surveys and interviews. The research findings illuminate the primary factors influencing students’ limited awareness of and attention to maritime environmental issues. The distribution of student responses regarding these factors were as follows: (1) “Unfocused Studies that Neglect Environmental Aspects” (25%); (2) “Weak Discourse on Environmental Issues on Campus” (17.5%); and (3) “Non-Integrated Learning Curriculum” (15%). These findings underscore critical domains that educational institutions, particularly the University of Islam KH. Ruhiat, need to address in order to enhance students’ awareness of maritime environmental issues. Strategies encompass curriculum revisions that incorporate environmental themes, promoting academic discussions on environmental concerns, and creating platforms for community engagement that prioritize maritime environmental issues.
Sub-Contractor Selection in Shipyard Companies Using Fuzzy-AHP Method
Authors: Amrullah Haidar Natsir , Khairansyah Mades Darul , Mudjiono Urip , Hamzah Fais , Shah Muhammad 
Published: November 2023

Abstract
Shipyard industries is one of the very complex construction jobs because there is much work to be done in parallel. Activities in the shipyard industry mostly involve sub-contractors. Although many advantages are obtained, involving sub-contractors in the company also has an impact on the company’s performance. The selection of the right sub-contractor is a crucial activity and will determine the company’s performance. This research uses the Fuzzy Analytical Hierarchy Process method (Fuzzy AHP) to solve the problem of selecting sub-contractors in the Shipbuilding Company. Alternative sub-contractors were evaluated and pairwise comparisons were made between these alternatives using Fuzzy AHP with a Triangular Fuzzy Number (TFN) approach. The TFN scale can reduce the ambiguity of expert judgment on AHP. A case study was conducted on the selection of sub-contractors with the bottom cleaning and ship replating project at shipyard company in Surabaya, Indonesia. As a result, one of the sub-contractors selected as the best sub-contractor with a score of 0.167.
The Behaviour of Thin-Walled Cylinders with Reinforcing Inner Walls Subjected to High-Velocity Impact
Authors: Hardi Witono , Harbelubun Mohammad Muzni , Suyono Tri 
Published: November 2023

Abstract
Thin cylindrical tubes as impact energy absorbers have been widely used in various fields. Previous researchers have proposed many methods to increase the ability to absorb energy by modifying the geometry or using different materials. This study discusses using reinforcing walls in the cylinder to increase energy absorption capability. We make thin cylindrical specimens made of aluminium alloy with a length of 150 mm, a diameter of 50 mm, and a thickness of 1 mm. Reinforcing walls are fitted in the cylinder with a vertical position of 1, 2, 3, and without supporting walls. An impactor moving at high velocity hits the up-end cylinder in the axial direction. The finite element method modelling results show that installing reinforcing walls in thin-walled cylinders increase the maximum impact force, decreases the maximum deformation, changes the deformation mode, and increases the energy absorption capability. The amount of wall added to the thin wall will affect the impact behaviour of the specimen. However, in this study, the presence of a wall will have an effect when the deformation reaches the location of the wall. Nevertheless, using this reinforcing wall also makes the manufacturing process more complex. Therefore, this study’s results are recommendations for the design of the impact energy absorption structural system.
Experimental Study Influence of High Fin on Naca Airfoil 0018 On Performance Of H-Type Darrieus Wind Turbine
Authors: Santoso Emie , Awika Ikhtiar Syah , Ariwiyono Nopem 
Published: November 2023

Abstract
Energy is something that is needed in life, as technology develops the need for energy is increasing as well, while the role of New Energy Darrieus wind turbine is one of the solutions for renewable energy because it utilizes energy from wind and is converted into electrical energy, but this turbine has a low starting torque. In this study, the performance of the Darrieus wind turbine was improved by adding a fin to each blade with variations in height (0 cm, 1,5 cm, 2,5 cm, and 3,5 cm). In addition, testing was also carried out with variations in fluid flow speeds (3 m / s; 5 m / s; and 7 m / s). The subjects used in this study were H-type Darrieus wind turbines with a diameter of 40 cm and a height of 50 cm. Experiments were carried out to find out how the effect of fin addition with variations in height on the coefficient of power (Cp) and coefficient of torque (Ct) of the darrieus wind turbine. The final results showed the best performance improvement of the savonius wind turbine occurred at a variation in the fin height of 2.5 cm at a wind speed of 5 m/s. The coefficient of torque (Ct) increased by 7.64% and the coefficient of power (Cp) by 48.38% against conventional H-type darrieus wind turbines. This is because the addition of an effective fin is to reduce the tip of the vortex at the end of each blade so that the flow of fluid that flows becomes more regular and maximum.
Compressive Strength Investigations Of Foamed Mortar Incorporating Sandblasting Waste As Supplementary Cementitious Materials
Authors: Wulandari Kiki Dwi , Jannah Nabillah Rodhifatul , Wutsqo Umniati Huwaida Urwatul , Firdaussyah Aditya Tetra , Hayu Gati Annisa , Sutrisno Wahyuniarsih 
Published: November 2023

Abstract
Silica sand is one of the abrasive materials commonly used in the sandblasting process. The production of sandblasting waste is raising yearly, linear with the rapid development of the shipping industries. Silica sand was produced as by-product waste, approximately 400 ton per year. This research focused on compressive strength investigations of the foamed mortar incorporating silica sand as a supplementary cementitious material (SCM). Foamed mortar is a lightweight mortar made from a mixture of water, cement, sand, and foam, which can reduce the density of the mortar for construction purposes. Prior to use as SCM, the silica sand was pre-treated by using mechanical grinding to produce finer materials similar to cement. The observations were applied to pre-treated silica sand, such as chemical compositions, particle size analysis, normal consistency test, and setting time test. The specimens used in this research were mortar concrete with dimensions 5 x 5 x 5 cm and tested according to ASTM C579-01. The pre-treated silica sand varied from 10%, 20%, and 30% by weight of cement, were applied in this investigation. The compressive strength and spesific gravity were also observed. The results show that 20% cement replacement with pre-treated silica sand is the optimum composition and has 52.2 MPa in compressive strength at 28th days. These investigations conclude that pre-treated silica sand is potentially used as SCM in foamed mortars for sustainable concrete materials.
Effectiveness of Crew Boat Hull Form on Manouvering Performance
Authors: Santoso Mardi , Budianto  , Kusuma Arga Bangun , Rosidy Muhammad Ilham Yusuf 
Published: November 2023

Abstract
The condition of the crew boat is good hull shape with good operational conditions when maneuvering. In this case, the condition of the waveform at sea will have a significant impact on the ship’s motion. To provide the optimal type of hull, it was developed by conducting several simulations on the ship’s motion. Several simulation conditions were carried out, including analyses of ship speed, the shape of the waves formed, and ship maneuvering. At the simulation stage, several types of hulls were carried out, including the single U-hull, the single V-hull, the trimaran, and the catamaran. The simulation limits the length of the ship but not the width of the ship because the conditions in the multi-hull require sufficient space for its width, so that it can be ascertained that it provides effective and efficient results for the selection of the shape of the hull. The simulation analysis carried out provides a recommendation that the single V hull model gives good results compared to other types of hull selection for crew boat hulls.
Decreasing Demurrage Time by Increasing Port Service Level and Utilities Considering Crane Formation Using Discrete Simulation
Authors: Tama Mahya Indra , Aqsha Bayu Dwi 
Published: November 2023

Abstract
Maritime logistics has a great influence on large-scale economic development. Maritime logistics has the largest logistics flow in Indonesia. Economic development can be seen by how much logistics flow in an area. The distribution of logistics using sea transportation must be controlled effectively and efficiently so that the flow of material does not stop or be disrupted. Teluk Lamong Terminal is the only green smart terminal in Surabaya, so there are many requests for ships to lean on the pier. The method of this research is to conduct a survey and collect information about the main activities of loading and unloading ships docking at the pier, the number of cranes used, the current crane formation (before improvement) and problems in the operation of containers. After that, create a simulation model that will be developed using Simulation Software that has inputted entities, activities, and model resources according to their actual activities. Scenario results improvements 1 to 4, the selection of crane formations in serving container ship loading and unloading is the most effective in scenario 3, namely by setting 3 cranes to serve 1 berthing ship and 2 cranes to serve 1 berthing ship. In scenario 3 with the simulation results obtained that the ship’s effective time at the dock was 9.19 hours and the demurrage time for container loading and unloading was 13.79 hours. Furthermore, crane utilization value is in scenario 3 with the results obtained from the simulation of 18.21%.