bluuebunny/crossref_metadata_2025_split huggingface dataset:
Atmospheric extinction coefficients and night sky brightness at ITB-Undana remote telescope site
Authors: Yusuf M. , Yap F. , Ramadhan S. , Jatmiko A. T. P. , Ramadhan D. G. , Perhati T. , Arwinata H. I. , Satya L. , Premadi P. W. , Louk A. C. , Putra M. 
Published: June 2024

Abstract
A remote telescope system has been established at Universitas Nusa Cendana, Kupang. Bosscha Observatory, Institut Teknologi Bandung (ITB), and the Physics Study Program at Universitas Nusa Cendana (Undana) collaborated to develop the system. The ITB-Undana Telescope system has a QSI 616 CCD camera and BV RI Bessel filter attached to a 20-cm (f/10) Schmidt-Cassegrain reflector. Several research and public outreach activities have been conducted using the ITB-Undana remote telescope throughout 2023. When establishing a new astronomical observation site, it is imperative to conduct sky characterization and quality assessment. This process involves measuring night sky brightness and atmospheric extinction coefficients. In May 2023, we observed photometric standard stars using the absolute photometry technique with BV RI Bessel filters. We also utilized the Sky Quality Meter (SQM) to measure night sky brightness over three nights from May 24th to May 26th, 2023, to compare the sky brightness values obtained through the absolute photometry method. Our initial measurement shows a first-order extinction coefficient value ranging from

k
b
′

= 0.269 to 0.520,

k
v
′

= 0.216 to 0.297,

k
r
′

= 0.019 to 0.206, and

k
i
′

= 0.127 to 0.163, for B, V, R, and I filter, respectively. Application of extinction coefficient value in the sky field gives a mean sky brightness value in V bandpass, V
sky = 19.431 ± 0.022, with color index (B − V )sky = 0.492 ± 0.039. These night sky brightness values are suitable for measurements using the SQM.
DIY Photometer Performance Test in Determining Morning Twilight
Authors: Asmoro C P , Susanti H , Utama J A , Herdiwijaya D , Putra M 
Published: June 2024

Abstract
Do-It-Yourself (DIY) Sky Quality Meter (SQM) known as D.I.Y – CJ’01 Photometer has been successfully built and tested. Using SQM as a calibrated portable photometer is a hot topic of astronomical research regarding night sky brightness measurement. The output data obtained by the photometer is in unit of magnitude per square arc second (mag/sq arcsecond ∼ mpsas) value with a maximum value of 21.7 mpsas as a quantization of the representation of a very dark sky with the presence of natural airglow. The sky brightness then gradually increases with values up to 16.7 mpsas, which is when the sky is brighter due to the presence of artificial airglow from outdoor artificial lighting such as in big cities. This research aims to determine the D.I.Y – CJ’01 Photometer performance in measuring the sky brightness of morning twilight. The research method used in this work is an experiment with data collection from D.I.Y - CJ’01 Photometer and SQM Unihedron gathered from two locations in Cimahi and Bandung. Data processing shows that the D.I.Y - CJ’01 Photometer mimics the performance of SQM Unihedron, with the the smallest difference for the value of the solar depression angle in morning twilight measurements is 0.06%.
Towards STEAM Education Platform for Indigenous Communities The case of Kasepuhan Ciptagelar
Authors: Soeharyadi Y , Iskandar G H 
Published: June 2024

Abstract
According to the World Economic Forum, appropriate education enables indigenous children and adult learners to exercise and enjoy economic, social, and cultural rights. It also strengthens their ability to exercise their civil rights so they can influence political policy processes for enhanced protection of their human rights. We contend that STEM education is one of the important components of appropriate education. The concept is modeled after the Science Pathway for Indigenous Communities developed by CSIRO. More specifically we carried out an initial study in Kasepuhan Ciptagelar, whose indigenous knowledge has been studied quite extensively.
Workshop on Young Crescent Moon: Visibility Limit and Digital Image Contrast
Authors: Hasan Faadillah M. , Kurniasari Martha , Asmoro Cahyo P. , Ikbal Arifyanto M. , Mahasenaputra  , Herdiwijaya Dhani , Irfan Hakim M. , Hidayat Taufiq , Jaelani Anton T. , Mulki Fargiza A. M. 
Published: June 2024

Abstract
The Institut Teknologi Bandung’s Astronomy Research Group hosted a workshop centered on understanding the young crescent moon (Hilal) phenomenon in Islamic astronomy. The primary focus was disseminating cutting-edge research, particularly a methodology for measuring digital image contrast to determine the young crescent’s visibility threshold. Participants included lecturers from Islamic Universities, private observatory administrators/observers, and astronomy enthusiasts. The workshop covered image processing fundamentals, hands-on activities involving digital image capture, and practical use of AstroImageJ software. Comprehensive feedback assessment measured its effectiveness. Additionally, the workshop aimed to promote research relevant to Islamic religious practices and introduce prospective students to Astronomy master’s and doctoral programs, fostering a crucial link between research and education in Islamic astronomy.
Citizen Science on April 20th Total Solar Eclipse Observation
Authors: Handini Ajeng T. , Premadi Premana W. , Yulianty Yatny , Yusuf Muhammad , Luthfiandari  , Gilang Ramadhan Dhimaz , Ramadhan Sahlan , Yap Ferry , Perhati Teduh , Yuna Dwi Y. 
Published: June 2024

Abstract
Citizen Science definition refers to activities carried out by the public voluntarily that contribute to scientific research. This definition continues to develop along with various activities and modes of collaboration involving professional scientists and the general public. Astronomy is one of the branches of science with the largest number of Citizen Science projects with objectives ranging from identification, and classification to involving a series of complex activities for the purpose of new discoveries. This paper explains efforts to attract public participation in the Citizen Science activities on the Total Solar Eclipse on April 20th, 2023 phenomenon by Bosscha Observatory and UNAWE Indonesia. Even though it has not yet reached the scientific contribution stage, observation activities carried out by the public have contributed to improving science literacy through a series of activities and participation carried out.
Effect of nano-SiO2 on flow-ability, setting time and strength properties of controlled low-strength materials using native silt soil
Authors: Qiu Haomiao , Jiang Senhua , Shou Lei 
Published: June 2024

Abstract
Controlled low-strength material (CLSM) is widely applied in many backfill engineering applications because of its excellent workability and sustainability. However, for CLSM using native soil as fine aggregate and industrial by-products as a binder, the flow-ability and self-leveling performance will deteriorate, and the setting time will be slower, which is unsuitable for construction applications. The addition of additives is regarded as an effective technique for improving the performance of CLSM. Although the effects of nano-SiO2 on the performance of concrete have been the subject of many studies, little research has been done on its effects on CLSM. The present work investigated the effects of adding nano-SiO2 as an additive. The flow-ability, hydraulic penetrometer, and unconfined compressive strength (UCS) tests are performed with the increasing nano-SiO2 content. Lastly, the mercury intrusion porosimetry (MIP) test is carried out to identify the effects of nano-SiO2 on the morphology of pores. For controlled low-strength materials using native silt soil, significant improvements in setting time and strength are observed with the increase of nano-SiO2. A decrease in the average pore diameter and an increase in the percentage of pore diameter below 20 nm are also observed in the specimen with nano-SiO2.
Effect of high temperature annealing on hot workability of Co40CrNiMo elastic alloy
Authors: Wu Yingfei , Ji Shuang , Sun Zhiyan , Zhang Dawei , Zhang Zefeng , Wang Ao , Sun Zhonghua 
Published: June 2024

Abstract
The effect of high-temperature annealing on the hot workability of Co40CrNiMo elastic alloy was investigated using high-temperature thermal simulation testing. Hot compression tests were conducted on the Gleeble3800 thermo-simulation machine under conditions of 0.1~20/s and 950-1150°C. The flow curve was analyzed, and based on rheological data, the hot deformation constitutive formula and processing map were established. The results indicate that high-temperature annealing improves the resistance to hot working in Co40CrNiMo; the activation energy for hot deformation after annealing decreases from 462.78 kJ/mol to 396.70 kJ/mol, resulting in a significant increase in the hot working range, with an optimal thermal processing range between 975~1150°C and a deformation rate of 0.1~1/s.
Research on the cutting performance and contact behavior of a new bionic saw blade segment
Authors: Tian Yongjun , Zhang Wei , Liu Jie , Yang Dayao , Ren Yi , Tang Yanan 
Published: June 2024

Abstract
Diamond circular saw blades, integral in industries such as aerospace, nuclear energy, and construction engineering, face challenges including high cutting forces and significant tool wear, which often fall short of modern engineering requirements. To address these issues, this study explores the application of the non-smooth morphology, inspired by the surface of Scapharca subcrenata, known for their friction-reducing and wear-resistant properties. This morphology is applied to the tool-chip contact area of the saw teeth. Comparative experiments, conducted through sawing simulations, reveal that the optimized tool demonstrates improvements in sawing force, equivalent stress, and material removal rate compared to conventional tools. These findings offer valuable insights for further research into the wear resistance and drag reduction optimization of diamond circular saw blades.
Comparison of microstructure and properties of Cr8 die steel before and after tempering
Authors: Yuan Sha , Zhou Leyu , Zhu Zhe , Jiang Peng , Feng Yanan , Hou Huimin , Wang Zhengyu 
Published: June 2024

Abstract
This paper observed and analyzed the microstructure, hardness, and tensile mechanical properties of Cr8 steel using the tensile testing machine, rockwell hardness tester, and metallographic microscope. The results showed that before quenching the carbides in Cr8 steel have different morphologies and obvious aggregation along the streamline and have low tensile strength and hardness. After quenching, some carbides dissolve into the matrix and undissolved carbides which are M7C3 and M23C6 are distributed on martensite in the shape of large particles. The tensile strength of the material reaches 1536 MPa and the hardness reaches 59 HRC.
Influence of air-guided ring structure on performance of axial-flow fan
Authors: Chen Lixiao , Zhang Chaolei , Liu Jing , Hu Zhihong 
Published: June 2024

Abstract
The aerodynamic performance and aerodynamic noise of the axial-flow fan are affected by the tip clearance between the air-guided ring and the blade tip. Through the design of the three main structural parameters of the axial-flow fan, the axial width L, the front air-guided ring radius R1, and the rear air-guided ring radius R2, the relationship between air-guided ring structure on the aerodynamic performance and aerodynamic noise of the axial-flow fan is studied. The results show that the aerodynamic performance of the fan can be improved with the increase of the axial width and the radius of the front air-guided ring, and be reduced with the increase of the radius of the rear air-guided ring. The decrease in the axial width of the air-guided ring and the increase in the radius of the front air-guided ring can reduce the aerodynamic noise. The aerodynamic noise increases first and then decreases with the increase of the radius of the rear wind deflector. The orthogonal test result shows that the influence sequence of three factors on the radiation noise at the fan outlet is as follows: L>R1>R2.
Safety assessment research of crane metal structure based on stress monitoring data of dangerous sections
Authors: Yuan Jingjie , Lv Xiao , Kang Dugang , Zhang Lei , Jia Shangyuan , Huang Yuangui 
Published: June 2024

Abstract
A method for assessing the safety of crane metal structures is proposed based on the monitoring data results of stress in dangerous sections. This method utilizes the stress-time history of these sections as input, employing statistical analysis through the rainflow counting method. The strength verification theory and the linear fatigue cumulative damage theory are applied to determine the strength margin and remaining fatigue life of the dangerous sections. Through reasonable assumptions, it has been confirmed that this method effectively evaluates the safety of crane metal structures, including the bridge erection machine. The findings presented in this paper offer valuable insights for the safety assessment of crane metal structures, thereby facilitating their practical application in engineering contexts.
The guide-aggregation effect of microgrooves on tribological properties of mechanical seals
Authors: Chen Xiaoya , Shi Liping , Li Meng 
Published: June 2024

Abstract
To investigate the guide-aggregation effect on the tribological performance of mechanical seals with groove textures and determine their optimal structure parameters for texture design, a lubrication model incorporating various guide slots on the mechanical seal was established based on Reynolds equations. The dimensionless load-carrying capacity, Pav, and the flow field distribution images of liquid films were obtained using a numerical calculation method. The influence of guide groove textures on the hydrodynamic pressure of the lubricant film on the mechanical seal clearance at different depths was analyzed, and a systematic exploration was conducted on factors such as the guide slot morphology, depth, and mechanical seal clearance, which affect the friction coefficient. The results show that our numerical calculations reveal that the frictional performance of mechanical seals significantly varies according to the configuration of guide slots. In various depth conditions, guide slots enhance the hydrodynamic pressure. With the increment in-depth, the load-carrying capacity of the liquid film initially increases. For the E-type, the optimal load-carrying capacity of the liquid film, Pav, is obtained at a depth of h1=10 μm, reaching 0.5275 Mpa. By comparing the surface textures of guide slots, it can be observed that the E-type texture exhibits an optimal friction property. The liquid membrane load-carrying capacity of the E-type texture with a height of h1=10 μm demonstrates a notable increase of 53.5%, 43.9%, and 23.6% when compared to the grooved, semi-circular, and herringbone textures, respectively. The findings reveal that the design of the guide slot leads to the accumulation of lubricant on the surface texture, thereby enhancing the pressure convergence. This, in turn, enhances the load-carrying capacity of the lubricating fluid film and reduces friction. The geometric parameters of the guide groove have a substantial influence on the fluid dynamic pressure within the end mechanical sealing pair, which in turn affects the tribological performance of the mechanical seal. Our research offers novel insights for the design of non-contact end mechanical seals in future applications.
Flexible conformal force-sensitive electrode based on the micro-pyramid structure
Authors: Tian Xin , Cheng Guanyin , Kong Yongkang , Wei Dapeng 
Published: June 2024

Abstract
Currently, pressure sensor technology is developing rapidly and has been integrated into all aspects of human scientific and technological activities. For pressure sensors, device performance is often significantly improved when different force-sensitive layers and microstructures are combined. The material selection of the force-sensitive layer and the structural design of the sensor are the vital factors to determine its performance. In this work, we combine micro-pyramidal polydimethylsilanes (PDMS) with force-sensitive layers of four different materials: Au, rGO (reduced Graphene Oxide), GNWs (Graphene Nano Walls) and CNTs (Carbon Nanotubes). GNWs were combined with the Au force-sensitive layer to form a new structural system, GAC. In this way, five sensors with different force-sensitive layers were prepared from both structural and material dimensions. Through our tests, GAC achieved the best performance among the five systems. Furthermore, it shows excellent advantages in body, voice, and pressure recognition.
Effect of bacteria inoculation in solidification/stabilization matrices for fibreboard wastewater sludge
Authors: Mohd-Kamal M H , Shahrurizan M A N , Mohd-Rais N N , Mohd-Kamil N A F 
Published: June 2024

Abstract
Fiberboard factories are rapidly growing to fulfill the increasing demand for timber production. Therefore, due to this rapid growth, there is a need to address wastewater sludge disposal concerns. This is crucial because the sludge contains a high concentration of contaminants that endanger the environment and public health. This study aims to treat the sludge by determining the potential of bacteria inoculation in the Solidification/Stabilization (S/S) method based on compressive strength, heavy metal leaching, and Chemical Oxygen Demand (COD) concentrations. The materials used in sludge remediation were Portland cement to act as a binder and Sphingobacterium spiritivorum. This study involves compressive strength testing, leaching tests using Toxicity Characteristics Leaching Procedure (TCLP), COD, and heavy metals concentrations analysis using Inductively Coupled Plasma Mass Spectrometry (ICP-MS) equipment in accordance with U.S. Environmental Protection Agency guidelines (U.S. EPA). After bacteria inoculation, data shows an increase of approximately 4.4% in compressive strength test. COD concentration level reduces by around 1.5% but heavy metals concentration increases except for Chromium (Cr) and all elements still exceed the permissible limits. Based on the overall results, the method of bacteria inoculation in S/S method revealed the potential to remediate wastewater sludge.
Noise Emissions Mapping from Ampang Line LRT
Authors: Arbaan A , Othman M H , Tong Y G , Ab Ghani A R , Ambak K , Borhan M N , Abdul Sukor N S 
Published: June 2024

Abstract
Train transportation is considered safe, sustainable, and climate-friendly mode of transportation. However, it may also lead to higher noise which may be annoying, disrupt sleep, and disturbance on residents who live nearby the train track. The aims of this study are to evaluate Light Rail Transit (LRT) noise level in urban area, at LRT Ampang Line by using grid lines method and to develop LRT noise mapping. The residential area that is located near the track was chosen in this study. The measurement of noise level for train passing-by was measured using B&K Type 2250 which was placed at 1.2 meter above the ground level. Noise measurement was carried out using 25 m x 25 m grid lines with short-term sampling method of 20 minutes of measurement for each point. The LRT noise level in the study areas at distance of 15 m from the centre of train tracks was found to be higher (77.04 dBA) than noise limit (65 dBA) guidelines from Department of Environment. The graph trendline of noise level was decreasing from 15m (30.64 dBA) to 115m (8.68 dBA) from the centre of the train tracks. These shows that the further the distance of the Sound Level Meter (SLM) placement, the lower the difference of the noise train pass-by and the background noise. The LRT noise mapping will be useful for the future LRT noise prediction.
Developing a critical influential factors Model (CIFsM) for Agile Management Principles in UAE Construction Projects
Authors: Yamahi M A , Suratkon A 
Published: June 2024

Abstract
The construction industry plays a crucial role in the global economy, with significant annual expenses and a substantial contribution to the GDP of the UAE. This has led to a surge in building projects, fostering rapid expansion among construction companies. However, challenges have emerged that hinder this growth, including high interest rates and intensified competition among building firms. Additionally, there are many issues impede project timelines and escalate dedicated costs. Many of these challenges can be addressed by addressing inefficiencies within internal processes of companies. Agile construction, a method or approach that facilitates swift adaptation to changes in delivery or design, has the potential to alleviate these challenges. By reducing the time between problem identification and solution implementation, agile construction can enhance project efficiency. This study aims to propose Critical Influential Factors Model (CIFsM) for Agile Management Principles to enhance the performance of construction projects in the UAE. The proposed model covers five critical influential factor groups: organizational, challenges, human resources, technical, and construction industry project performance in the UAE. The research recommends implementing the model empirically using a quantitative approach to enhance integration among construction parties and alleviate concerns about low project performance levels. Developing the CIFsM based on agile management principles offers a promising avenue to enhance construction project performance in the UAE by addressing critical influential factors and adopting an empirical quantitative approach, leading to improved project integration and reduced concerns about low performance levels.
Investigation of Soil and Plant Nutrients in Residential Area in Parit Rasipan Drainage System
Authors: Miswan MS , Azman MHA , Hamdan R , Siddiqui Z 
Published: June 2024

Abstract
Nutrient pollution pertains to elevated nitrogen, phosphorous, and potassium concentrations within aquatic systems. Nutrient pollution is the process by which excessive nutrients, primarily Nitrogen, Phosphorus and Potassium (NPK), are supplied to bodies of water and can act as fertiliser, causing excessive algal growth. This phenomenon is also known as eutrophication. Excessive nutrient levels can cause more severe issues, such as low dissolved oxygen levels in the water. The main objective of this study has been to evaluate the soil and plant nutrient content in the residential area of the Parit Rasipan drainage system. NPK levels were determined by collecting soil and plant samples at four specified sampling points within the study area, both during wet and dry days, using the APHA 4500 NORG-B and US EPA 6010B (ICP OES) methods. In addition to that, the pH, Dissolved Oxygen (DO), and temperature were recorded in situ. Water samples were also collected and analysed for specific parameters, including Total Nitrogen (TN), Total Phosphorus (TP), and Potassium (K). The analysis used a HACH DR6000 Spectrophotometer and Atomic Absorption Spectroscopy (AAS). The study findings indicate that the soil concentrations of TN (1660–2250 mg/kg), TP (100–360 mg/kg), and K (1020–1692 mg/kg) fall within the range of low to very high classifications. In the meantime, it is noteworthy that the concentrations of TN (4780–7870 mg/kg), TP (821–1640 mg/kg), and K (702–9160 mg/kg) in plants have been categorised as ranging from moderate to very high. In the context of water quality monitoring, the collected data indicates that the pH levels range from 3.16 to 3.22, the dissolved oxygen levels range from 0.95 to 0.98 mg/L, and the temperature ranges from 29.30°C to 26.34°C, observed during both wet and dry weather conditions. In summary, based on the analysis of the findings, it can be determined that the Parit Rasipan drainage system demonstrates a significant concentration of NPK elements under both wet and dry weather conditions, primarily due to residential activities occurring within the area.