bluuebunny/crossref_metadata_2025_split huggingface dataset:
Phase transitions and slow spin dynamics of slightly inverted A-site spinel CoAl2−x
Ga
x
O4
Authors: Naka T , Valenta J , Nakane T , Ishii S , Nakayama M , Mamiya H , Takehana K , Tsujii N , Imanaka Y , Matsushita Y , Abe H , Uchikoshi T , Yusa H 
Published: December 2023

Abstract
We report the properties of an A-site spinel magnet, CoAl2−x
Ga
x
O4, and analyze its anomalous, low-temperature magnetic behavior, which is derived from inherent, magnetically frustrated interactions. Rietveld analysis of the x-ray diffraction profile for CoAl2−x
Ga
x
O4 revealed that the metallic ions were randomly distributed in the tetrahedral (A-) and octahedral (B-) sites in the cubic spinel structure. The inversion parameter η could be controlled by varying the gallium (Ga) composition in the range 0.055 ⩽ η ⩽ 0.664. The composition-induced Néel-to-spin-glass (NSG) transition occurred between 0.05 ⩽ η ⩽ 0.08 and was verified by measurements of DC-AC susceptibilities χ and thermoremanent magnetization (TRM) below the Néel transition temperature T
N. The relaxation rate and derivative with respect to temperature of TRM increased at both T
N and the spin glass (SG) transition temperature T
SG. The TRM decayed rapidly above and below these transitions. TRM was highly sensitive to macroscopic magnetic transitions that occurred in both the Néel and SG phases of CoAl2−x
Ga
x
O4. In the vicinity of the NSG boundary, there was a maximum of the TRM relaxation rate at T
max < T
N. With increasing inversion η(x), the anomaly at T
max merged with that of the Néel transition at a tricritical point (η
tc, T
tc) = (0.08, 4.0 K), where the paramagnetic, Néel, and SG states met. We successfully extracted the relaxation time τ and other characteristic parameters from the TRM isothermal temporal evolution based on the Weron function derived for a purely stochastic process. To distinguish the magnetic states, we compared our results with previously studied inversion-free A-site spinel, CoRh2O4, and CoGa2O4 cluster glass. We generated an inversion-temperature phase diagram based on the comprehensive measurements of DC and AC susceptibilities, TRM, and specific heat in the range 0.055 ⩽ η ⩽ 0.664 for CoAl2−x
Ga
x
O4. Based on this phase diagram, we speculate that a NSG quantum critical phase transition occurred at η = 0.050(6). Our findings are consistent with suppression of the long-range order antiferromagnetic state in CoAl2O4 revealed through neutron diffraction studies, even at T << T
N.
Fabrication of a freestanding AlN substrate via HVPE homoepitaxy on a PVT-AlN substrate
Authors: Liu Ting , Zhang Qian , Li Xu , Chen Minghao , Du Chunhua , Sun Maosong , Wang Jia , Tan Shuxin , Zhang Jicai 
Published: December 2023

Abstract
Hydride vapor phase epitaxy (HVPE) is employed for the homoepitaxial development of AlN thick films on AlN substrates grown via physical vapor transport (PVT). A freestanding AlN substrate with a 200 μm thickness is then obtained by mechanically grinding away the PVT-AlN substrate. The as-grown HVPE AlN layer has a smooth surface with long parallel atomic steps. The freestanding HVPE-AlN substrate is crack-free and stress-free. In comparison to PVT-AlN substrate, HVPE-AlN substrate not only has better crystal quality but also substantially lower C, O, and Si impurity concentrations. The deep ultraviolet (DUV) transmittance of the 200 μm thick freestanding AlN substrate is as high as 66% at 265 nm. This performance aligns perfectly with the demands of AlGaN-based DUV optoelectronic devices.
The factors influencing urban health in Jakarta Province during Covid-19 outbreak
Authors: Yahya W , Fatimah E , Sihombing P R , Adinugroho B 
Published: December 2023

Abstract
The rapid urbanization in Jakarta has given rise to a wide range of urban problems, characterized by an imbalance between the population growth rate and urban resources. This imbalance has resulted in a decline in the quality of urban services, making the population highly venerable to diseases, particularly during and after the Covid-19 outbreak. Relevant studies have indicated that variables related to infrastructure, social and economic determinants can affect urban health. However, the literature exploring the relationship between health determinants and urban health from an urban planning perspective is still limited. The aim of the research is to examine the relationship between health determinants and urban health in Jakarta Province during the Covid-19 outbreak. The study employed Partial Least Square (PLS) path modeling using smartPLS software, while data were collected through questionnaires administered to 317 Jakarta residents. The results showed that urban health determinants, represented by the built environment/infrastructure and social determinants, significantly and positively impacted the physical health of Jakarta residents. However, the urban health determinants insignificant on the mental health of Jakarta residents during Covid-19. It was also found that built environment/infrastructure had a greater influence on physical health than other determinants. This impact was significant for both neighborhoods that are well-resourced and under-resourced. The influence of the social determinant on physical health significantly varied between these neighborhoods. This research emphasized the importance of stakeholders focusing on improving the population’s quality of life and health through the built environment/infrastructure and social determinants.
Characteristics of public spaces in BSD City-gated community
Authors: Alfarizi F A , Wiranegara H W , Supriyatna Y 
Published: December 2023

Abstract
Providing public spaces within city-gated communities can help reduce social segregation between residents and non-residents. To facilitate interaction, it is important to identify the characteristics of public space that are most preferred. This study aims to identify the characteristics of public space based on the preferences of gated and non-gated residents in a private city-gated community. There are four characteristics of public space studied: multifunctionality, accessibility, convenience, and inclusiveness. Collecting data uses the questionnaire survey method. The analysis technique used second-order confirmatory factor analysis. This study’s results show that multifunctionality, accessibility, convenience, and inclusiveness are significant characteristics of public space to stimulate interaction between gated and non-gated residents in BSD City. Accessibility is the characteristic of mosques and markets. On city parks and a total public space, it is not proven. The users of city parks are not concerned with it as long as they can obtain their needs within it. So, the conclusion is that the three main characteristics of public spaces promoting interaction between residents of gated and non-gated are multifunctionality, convenience, and inclusiveness.
The impact of the operation of the Jatiasih toll gate on economic activities in the Jatiasih Sub-district
Authors: Yahya W , Sitawati A 
Published: December 2023

Abstract
The JORR E1 (Cikunir-Jatiasih) toll road was was built with the primary goal of improving connectivity between the southern part of Bekasi City and neighboring regions. The construction and opening of the toll gate could yield a range of effects on the community, spanning from positive to negative impacts. This research aims to assess the impact of the Jatiasih toll gate’s operation on economic activities and their externalities based on public perception. Data were collected through questionnaires distributed to 102 residents of the Jatiasih and Jatimekar urban villages. A quantitative descriptive method with scoring analysis was employed for the analysis. The results indicated that the operation of the Jatiasih toll gate has significantly affected the economic condition of both the Jatiasih and Jatimekar urban villages. In the economic aspect, the operation of the toll gate has led to a considerable transformation of residential functions, with business activities being incorporated into residential properties. This integration has resulted in increased economic activities within a 1 km radius. However, it is important to note that the development of economic activities within this radius has generated negative externalities in the surrounding area. This research emphasizes the importance of monitoring economic activities to better understand economic situations and to facilitate policymaking geared toward sustainable development and management.
Potential reduction of greenhouse gas emissions from waste banks and 3R waste treatment facilities in Bandung City
Authors: Nursetyowati P , Rachmanissa S , Fairus S , Azizi A 
Published: December 2023

Abstract
The Indonesian government has established a 30% reduction by 2030 target for reducing GHG emissions, through the 3R (Reduce, Reuse, Recycle) approach. In the City of Bandung, various institutions are involved in waste handling and reduction. The objectives of this study were to determine the GHG emissions, resulting from household waste disposal at Sarimukti Landfill, without (scenario 1) and with (scenario 2) the utilisation of Waste Banks, 3R Waste Treatment Facility (TPS 3R), and an incinerator in a TPS 3R, at Ciwastra Market, as well as to estimate the GHG emissions, once Bandung City successfully achieves its waste reduction and waste management target in 2025, as stated in the Bandung Mayor Regulation No. 1426 of 2018, leveraging all existing facilities with the landfilling (scenario 3) and incineration (scenario 4) method. The calculations made were aligned with the Intergovernmental Panel on Climate Change (IPCC) 2019 Guidelines Tier 1. The findings of this study revealed that, in the first scenario, the GHG emissions amount to 185,271.934 tons of CO2eq. In the second scenario, the emissions amount to 150,423.096 tons of CO2eq. Consequently, the reduction in GHG emissions achieved is 34,848.847 tons CO2eq. In the third scenario, the emissions are 64,373.560 tons of CO2eq, while in the fourth scenario, GHG emissions are 70,001.973 tons of CO2eq. These findings highlight the substantial GHG emission reductions achievable through the implementation of waste management strategies. By adopting these approaches, it is possible to mitigate the environmental impact of waste disposal and contribute to the reduction of GHG emissions, well in tandem with the climate change mitigation goals.
The walkability concept based on pedestrian perceptions in Bandung City Square, Indonesia
Authors: Dewi L , Situmorang R , Adriana M C 
Published: December 2023

Abstract
The concept of walkability is about the provision of a pedestrian-friendly environmental condition that provides security, comfort and safety, and offers visuals for pedestrians. The Bandung City Square Area has various attractions which all promote walking activities. However, the presence of street vendors, the lack of facilities for the disabled, inadequate vegetation, crossings, and supporting facilities, and also illegal parking have caused problems, which have rendered the pedestrian-friendly environmental aspects not being able to be fulfilled. This study aims to assess the walkability of streets in Bandung City Square Area, using aspect of walkability based on pedestrian perception as users. The research was conducted using the Global Walkability Index and Multicriteria Satisfaction Analysis, based on pedestrian perception surveys. The results showed that, the existing conditions of streets’ walkability in Bandung City Square Area is Waiting to Walk, which is adequate for walking. For example, five parameters, namely the availability of crossings, security against crime, disabled infrastructure, grade safety of crossing, and motorist behavior were found to be below average. It can also be concluded that, three parameters, namely crossing safety, security against crime, and disabled infrastructure require immediate attentions. The overall results of the study suggested that, improvement of streets’ walkability is needed by focusing on parameters that are below-average, thus requiring immediate attentions. Further research is recommended to find effective improvements for streets’ walkability, based on the pedestrian perception to have a pedestrian-friendly environment in Bandung City Square Area.
Assessment of lead heavy metal pollution in Ciliwung River
Authors: Juwana I , Nurjayati R , Hidawati  , Maria R , Santoso H , Marganingrum D 
Published: December 2023

Abstract
Heavy metal contributed in bio-magnification process. So, its presence needs to be monitored and evaluated to prevent and control its hazards to human health and sustainability river ecosystem. One of that heavy metal is lead. This study aims to assessment the lead metal pollution in Ciliwung River because one of its uses is as water resources for Regional Drinking Water Company (PDAM). This study used a survey and analytical method. There were 12 samples of water column and 10 samples of sediments that distributed from upstream to the beginning of downstream. The parameters determined in site used water checker included temperature, pH, Electrical Conductivity (EC), Total Dissolved Solids (TDS), Dissolved Oxygen (DO), and Oxidation Reduction Potential (ORP). While the lead contained in sample used Automatic Absorption Spectrophotometric (AAS). The result showed that lead content in all samples exceeded the quality standards and the lead on sediment were more than in water column. Lead in the Ciliwung River is mostly due to anthropogenic sources because it occurred naturally in small amounts. Downstream, the EC, TDS, and ORP values increase, while the pH and DO value decreases. The ORP values at all sampling points were positive. It means that deoxygenation occurred along the Ciliwung River. The implication is needed the additional raw water processing that accompanied further economic analysis to make sure the water availability for the community sustained.
Analyzing the primary hydrological components (rainfall and discharge) within the context of Cipunagara Watershed management, West Java
Authors: Nurhayati S A , Marselina M , Fuad A Z 
Published: December 2023

Abstract
The Cipunagara River Basin is a component of the Citarum Watershed, necessitating a thorough analysis of hydrological data particularly rainfall and discharge for effective management. The watershed spans a moderate area of 1,363 km2 across three administrative divisions: Subang Regency, Indramayu Regency, and a segment of Sumedang Regency. Hydrological data analysis is imperative in watershed management. This study aims to analyze the key hydrological elements relevant to Cipunagara Watershed management. Rigorous consistency and homogeneity tests were conducted on rainfall data from each station. Changes in watershed flow patterns were scrutinized by examining shifts in runoff coefficient values and base flow magnitudes. The upward trend in runoff during the rainy season and the corresponding decline in base flow throughout the dry season may be attributed to land use alterations within the Cipunagara Watershed zone. To proactively address drought concerns in watershed management, the study calculated the 80% dependable flow to assess water availability during arid months, yielding an 80% dependable flow rate of 16.25 m3/s for the Cipunagara Watershed.
Economic evaluation of biodiesel plant design in Bontang, East Kalimantan, Indonesia
Authors: Panjaitan J R H , Nury D F , Suswanto V V , Putri L D 
Published: December 2023

Abstract
Biodiesel is an alternative fuel that was potential to be produced in Indonesia. Biodiesel can reduce dependence on fossil fuels so that large-scale biodiesel production was needed to encourage renewable energy application. In this research, plant design and economic evaluation of biodiesel plant will be carried out. The research aims to evaluate the economic of biodiesel plant design in Bontang, East Kalimantan, Indonesia at 2023. The designed of biodiesel plant had 68,000 tons/year capacity with Crude Palm Oil (CPO) and methanol as raw materials which will be built in 2026 at Bontang, East Kalimantan. Bontang was chosen by considering the industrial area, proximity to raw materials, ease of transportation and utility. The process technology used in biodiesel plant design was transesterification reaction with a liquid phase base catalyst. From profitability analysis showed that 53.17% Return of Investment (ROI), 2.35 years Payback Period (PBP), US$ 22,237,387 Net Present Value (NPV), and 33.5% Internal Rate of Return (IRR).
Effect of biochar in soil on microbial diversity: a meta-analysis
Authors: Adirianto B , Bachtiar T 
Published: December 2023

Abstract
The diversity, structure, and behavior of soil microbes communities, which are crucial to the breakdown of organic matter, cycling of nutrients, and general health of the soil, can be impacted by biochar. This study uses a meta-analysis approach to examine how biochar affects soil microbial diversity, and it anticipates that the results will take the form of a summary of the information that has already been published in journals. This study presents a meta-analysis of 24 articles published between 2018 and 2023 that reported biochar’s effect on soil microbial diversity and richness. Alpha diversity indexes such as Shannon, Simpson (Diversity index), Chao1, and ACE (Richness Index) were measured as parameters, as well as the operational taxonomic units (OTUs) count. The levels of biochar dosage varied from 0 to 50% w/w. Simpson (0.546), the OTUs (0.473), Chao1 (0.227), Shannon (0.125), and ACE (0.056) had the most significant effect sizes for the biochar (Hedges’d), with the majority of the values impact sizes being on the right. According to aggregate-driven tree analysis, the type of biochar, application rate, use of the soil, and length of the experiment all play a significant role in how biochar affects soil microbial diversity. In conclusion, adding biochar requires considering biochar application rates and type to improve microbes’ diversity.
Wet-dry cycle of expansive soil stabilized with fly ash and waste foundry sand on bearing capacity and swelling potential
Authors: Gunarti A S S , Zaika Y , Munawir A , Suryo E A , Harimurti  
Published: December 2023

Abstract
The behavior of expansive soil, which is sensitive to water, makes it susceptible to moisture content changes, resulting in the soil becoming soft during the rainy season and soil shrinkage during the dry season. This research aims to study the effects of the wet-dry cycle on the bearing capacity and swelling potential of stabilized expansive clay soil using two types of industrial waste, namely Fly Ash (FA) and Waste Foundry Sand (WFS), as soil improvement and industrial waste management efforts. The wet-dry cycle is assumed to represent the changes in the environment due to seasonal variations. The wetting cycle is conducted by immersing the soil samples in water, while the drying cycle is achieved by allowing them to air dry at room temperature. The FA content is set at 9% and the WFS content at 15% by weight of dry soil. The California Bearing Ratio (CBR) test is performed after the completion of the wet-dry cycle, while the swelling test is conducted during the wet-dry cycle. Each sample undergoes one, two, and three cycles of wetting and drying. The results showed that the CBR value increased with the addition of FA and WFS. The CBR value of natural soil is 8.89% while the CBR value of soil+9%FA+15%WFS is 16.02%. During the wetting phase, the CBR value decreases with increasing moisture content. After undergoing the third cycle, the CBR value and development potential tend to remain constant.
Implementation of fungal-based desalination through capacitive deionization for urban water provision: a conceptual framework
Authors: Irfani M R A N 
Published: December 2023

Abstract
The increasing demand for clean water in urban areas calls for innovative and sustainable water treatment solutions. Capacitive deionization (CDI), using fungal-based materials for desalination, offers potential benefits such as sustainability, low cost, and scalability, for urban water provision. However, few studies have explored the practical application of fungal-based CDI technology. This research assesses the feasibility of implementing fungal-based CDI technology in urban water provision systems, drawing on the key study from Chen et al.’s 2022 research, examining the preparation and performance of fungal-based CDI electrodes derived from Aspergillus niger. To create a reliable and up-to-date conceptual model, additional literature from indexed journals, focusing on CDI in desalination facilities from the past decade, is also reviewed. A conceptual framework was developed to demonstrate the potential integration of fungal-based CDI technology into urban water treatment systems, and taking into account factors such as capital and operational costs, scalability, and sustainability. The outcome of this study is a conceptual model that promotes further development of urban water provision through desalination, broadening the perspective on the application of emerging biotechnology, using fungal-based materials for water provision.
Municipal solid waste management in regency area in Indonesia: a review of Deli Serdang
Authors: Fariz R D A , Rachman I , Matsumoto T 
Published: December 2023

Abstract
Municipal solid waste management (MSWM) in Indonesia is increasingly complex for various reasons. The quantity of solid waste is expected to increase substantially due to an increasing population and rapid urbanization. Each municipality in Indonesia has a distinct technique and method to manage solid waste, depending on the peculiarities and problems. Cities and regencies have different characteristics. Research on municipal solid waste management conducted in regency areas is still limited. This study aims to investigate the implementation of MSWM in Indonesian regency areas. This study is based on a literature review and the relevant policies, but it also incorporates simple statistical analysis to support the points and arguments in this paper. The review found differences characteristic of MSWM in regency areas and city areas, such as waste generation, waste composition, and source of waste. MSWM solutions vary according to each municipality and rely heavily on local governments’ commitment and their financial, technical, and institutional capacity. The existing waste problem must be addressed holistically from upstream to downstream with a ‘cradle-to-grave’ mindset to create tangible advances in Indonesia’s solid waste management.