Local Group Research Articles

Subaru Suprime-Cam Wide-field BVI Stellar Photometry of the M33 Galaxy

We have surveyed the complete extent of the disk of M33—a gas-rich low-mass dwarf spiral galaxy in the Local Group. The B-, V-, and I-passband (the Johnson–Cousins system) CCD images (typical seeing ∼0.″8) were obtained with the Subaru Telescope equipped with the Suprime-Cam mosaic camera. The wide-field (∼1.°0 × 1.°5) catalog of 803,095 (15 ≤ V ≤ 25) starlike objects, measured using the point-spread function and aperture photometry techniques, is presented. We determined the distance modulus of M33 using the tip of the red giant branch (I TRGB = 20.64 ± 0.02) as a reference point of (m − M)0 = 24.63 ± 0.02stat ± 0.06syst (843 kpc). We found young (≲100 Myr) stellar populations residing up to the deprojected radius of ∼10 kpc. The scale length of the young main-sequence (MS) star surface-number density in the range of radial distances from 7 to 9 kpc is 0.53 ± 0.03 kpc. The youngest MS stars (≲15 Myr) reside up to the radius of ∼8 kpc. This distribution of stellar populations may suggest an outside-in scenario of recent star formation in the disk of M33.

The Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER). VI. The High-mass Stellar Initial Mass Function of M33

We measure the high-mass stellar initial mass function (IMF) from resolved stars in M33 young stellar clusters. Leveraging the Hubble Space Telescope’s high resolving power, we fully model the IMF probabilistically. We first model the optical color–magnitude diagram of each cluster to constrain its power-law slope Γ, marginalized over other cluster parameters in the fit (e.g., cluster age, mass, and radius). We then probabilistically model the distribution of mass function (MF) slopes for a highly strict cluster sample of nine clusters more massive than log(Mass/M ⊙) = 3.6; above this mass, all clusters have well-populated main sequences of massive stars and should have accurate recovery of their MF slopes, based on extensive tests with artificial clusters. We find that the ensemble IMF is best described by a mean high-mass slope of Γ¯=1.49±0.18 , with an intrinsic scatter of σΓ2=0.020.00+0.16 , consistent with a universal IMF. We find no dependence of the IMF on environmental impacts such as the local star formation rate (SFR) or galactocentric radius within M33, which serves as a proxy for metallicity. This Γ¯ measurement is consistent with similar measurements in M31, despite M33 having a much higher SFR intensity. While this measurement is formally consistent with the canonical Kroupa (Γ = 1.30) IMF, as well as the Salpeter (Γ = 1.35) value, it is the second Local Group cluster sample to show evidence for a somewhat steeper high-mass IMF slope. We explore the impacts a steeper IMF slope has on a number of astronomical subfields.

Geospatial Analysis of Lumpy Skin Disease Outbreaks among Cattle in Uttar Pradesh, India, 2021-2022.

The emergence of lumpy skin disease (LSD) among cattle in India is concerning. District-level data on LSD cases in Uttar Pradesh between 2021 and 2022 were analyzed. A stepwise spatial analytical approach was followed by first constructing yearly and monthly disease maps for LSD incidence rates (IRs), then spatially interpolating the LSD IRs, followed by evaluating the global and local clustering of LSD IRs and finally conducting spatial regression modeling. Overall, 5784 LSD cases from 6 districts and 112,226 cases from 33 districts were detected in 2021 and 2022, respectively. In the incremental spatial autocorrelation analysis, the highest global clustering of LSD IRs for the 2022 outbreak was detected at 196.49 km. For the 2021 LSD outbreak, one district with high-low and nine districts with low-high LSD IRs were identified in the eastern region of the state. For the 2022 LSD outbreak, 13 districts with high-high and 7 districts with low-high LSD IRs were identified in the western part of the state. A geographically weighted regression model identified the impact of climate (temperature and humidity) and land cover (pasture, fallow, and non-agricultural land) on LSD IRs. The study results can aid animal health authorities in developing LSD prevention and control programs.

The Plane Quasar Survey: First Data Release

We present a sample of 305 QSO candidates having ∣b∣ < 30°, the majority with GALEX magnitudes near-UV < 18.75. To generate this sample, we apply UV–IR color selection criteria to photometric data from the Ultraviolet Galactic Plane Survey as part of GALEX-CAUSE, the Million Quasars Catalog, Gaia DR2, and Pan-STARRS DR1. 165 of these 305 candidate UV-bright active galactic nuclei (AGN; 54%) have published spectroscopic redshifts from 45 different surveys, confirming them as AGN. We further obtained low-dispersion, optical, long-slit spectra with the Apache Point Observatory 3.5 m, MDM 2.4 m, and MDM 1.3 m telescopes for 84 of the candidates, and confirm 86% (N = 72) as AGN, generally with z < 0.6. Of these 72 confirmed AGN, 25 are newly discovered low-latitude QSOs without any previous spectroscopy. These sources fill a gap in the Galactic latitude coverage of the available samples of known UV-bright QSO background probes. Along with a description of the confirmed QSO properties, we provide the fully reduced, flux- and wavelength-calibrated spectra of 72 low-latitude QSOs through the Mikulski Archive for Space Telescopes. Future Hubble Space Telescope/Cosmic Origins Spectrograph spectroscopy of these low-Galactic-latitude QSOs has the potential to transform our view of the Milky Way and Local Group circumgalactic medium.

PENDAMPINGAN PETERNAK KAMBING PADA WILAYAH PENYANGGA PERUSAHAAN PTPV VII KABUPATEN LAMPUNG TENGAH

In the context of rural economic development, it is important to implement a social innovation collaborative model with social agents (industry, government, NGOs, and other organizations), where farmers take collective action to build a sustainable agricultural production system. Using the INRM (Integrated Natural Resource Management) method, the FEB Unila Community Service Team developed an Inclusive Social Business Model that encourages local farmer groups to collaborate on economic and social development activities through goat farming. INRM is a method of development-oriented research that aims to simultaneously reduce poverty, increase food security, and achieve environmental protection. The result of the community service is the formation of a livestock farmer group organization which is expected to become a local institution that plays the role of the Inclusive Social Business Model, encouraging sustainable economic and social programs to increase the income of farmers particularly, and the community of Mekar Jaya Village in general.

Principles for equitable and resilient tropical peatland restoration in Central Kalimantan, Indonesia

Indonesia's tropical peatlands are crucial global carbon stores but have been heavily degraded in recent decades. We present seven principles for equitable and resilient tropical peatland restoration in Central Kalimantan, Indonesia, host to 19% of Indonesia's tropical peatland area, where local livelihoods, cultural practices, and indigenous social relations remain closely connected. Our collaborative methods employed a Delphi survey and focus group discussions with researchers from various disciplines to develop a shared vision for restoration. This vision served as a boundary object during interviews with diverse stakeholders involved in peatland restoration in Central Kalimantan, allowing for refinement and adaptation of the vision and the development of principles to achieve it. The principles emphasize inclusive and collaborative decision‐making, planning, and implementation; site‐specific approaches adapted to local social and ecological conditions; and ensuring the informed consent of and fair benefit distribution to all local social groups. They also emphasize a holistic, integrated, and long‐term approach to restoration that considers multiple aspects, including hydrological function, vegetation regeneration, fire prevention, locally appropriate livelihood benefits, inclusive governance, and adaptive management practices. These principles serve as a starting point for resilience‐oriented social‐ecological restoration practice and policy formulation, aiming to facilitate equitable, effective, and resilient tropical peatland restoration outcomes.

Probing rotaxane dynamics with 19F NMR/MRI: Unveiling the roles of mechanical bond and steric hindrance

BackgroundDeciphering the molecular dynamics (MD) of rotaxanes is crucial for designing and refining their applications in molecular devices. This study employed fluorine-19 nuclear magnetic resonance (19F NMR) and magnetic resonance imaging (MRI) to unveil the interplay between mechanical bonds and steric hindrance in a series of fluorinated rotaxanes. Results1H/19F NMR revealed stable “Z”-shaped wheel conformations minimizing steric clashes and favoring π-π interactions with the axle. Utilizing fluorines and axle protons as reporters, 1H/19F relaxation rates and solid-state 19F NMR studies demonstrated that mechanical bond primarily governs wheel motion, while steric hindrance dictates axle movement. Intriguingly, mechanical bond mainly affects local axle groups, leaving distant ones minimally impacted. MD simulations corroborated these findings. Temperature-dependent 19F NMR indicated that energy input enhances rotational motion and wheel conformational transitions. Furthermore, the drastic increase in 19F relaxation rates upon mechanical bond formation and steric hindrance enables sensitive and selective 19F MRI visualization of MD changes. SignificanceThis study, by elucidating the roles of internal and external factors on rotaxane molecular dynamics using 19F NMR/MRI, offers valuable insights that can advance the field of rotaxane-based molecular devices.

Star formation properties of z ∼ 1 galaxy clusters and groups from Horizon Run 5

ABSTRACT Quiescent galaxies are predominantly observed in local galaxy clusters. However, the fraction of quiescent galaxies in high-redshift clusters significantly varies among different clusters. In this study, we present the results of an analysis of the star formation (SF) properties of $z \sim 0.87$ clusters and groups from a cosmological hydrodynamical simulation Horizon Run 5. We investigate the correlation between the quiescent galaxy fraction (QF) of these model clusters/groups and their various internal or external properties. We find that halo mass is one of the most important characteristics as higher mass clusters and groups have higher QFs. We also find that other properties such as stellar-mass ratio and Friends-of-Friends fraction, which measures the proportion of the area around a cluster occupied by dense structures, may mildly affect the QFs of clusters and groups. This may indicate that the evolutionary history as well as the large-scale environment of clusters and groups also play a certain role in determining the SF status of high-redshift galaxy clusters and groups.

Women’s campaigning, petitioning, and grassroots activism, 1945–1997

ABSTRACT Petitioning provided a flexible repertoire for women’s political activity in the decades after 1945. Petitioning was a popular, widespread practice: aside from voting, signing a petition was one of the few political activities that engaged a majority of women. Building on a long tradition of British women as active petitioners, petitioning was used by a variety of different groups—local action groups, voluntary associations, political parties, pressure groups, and radical social movements, including those associated with the Women’s Liberation Movement. Connecting formal and informal politics, petitioning was a relatively cheap, accessible form of political activity that enabled activism. In particular, the practices associated with name-signing created informal, temporary political spaces for women. Petitioning also provided a mechanism for representation and making representative claims to authority on behalf of women. The media-friendly spectacle of presenting petitions to authority was useful for attracting publicity as a range of activists, including conservative moral campaigners like Mary Whitehouse realised. The flexibility of petitioning explain its popularity as a form of political participation for women, particularly in facilitating local, informal activity.

Realistic simulated galaxies form [α/Fe]–[Fe/H] knees due to a sustained decline in their star formation rates

ABSTRACT We examine the stellar [$\alpha$/Fe]–[Fe/H] distribution of $\simeq 1000$ present-day galaxies in a high-resolution EAGLE simulation. Roughly half of the galaxies exhibit the canonical distribution, characterized by a sequence of low-metallicity stars with high [$\alpha$/Fe] that transitions at a ‘knee’ to a sequence of declining [$\alpha$/Fe] with increasing metallicity. This population yields a knee metallicity–galaxy–mass relation similar to that observed in Local Group galaxies, both in slope and scatter. However, many simulated galaxies lack a knee or exhibit more complicated distributions. Knees are found only in galaxies with star formation histories (SFHs) featuring a sustained decline from an early peak ($t\simeq 7~{\rm Gyr}$), which enables enrichment by Type Ia supernovae to dominate that due to Type II supernovae (SN II), reducing [$\alpha$/Fe] in the interstellar gas. The simulation thus indicates that, contrary to the common interpretation implied by analytic galactic chemical evolution (GCE) models, knee formation is not a consequence of the onset of enrichment by SN Ia. We use the SFH of a simulated galaxy exhibiting a knee as input to the vice GCE model, finding it yields an $\alpha$-rich plateau enriched only by SN II, but the plateau comprises little stellar mass and the galaxy forms few metal-poor ([Fe/H] $\lesssim$$-$1) stars. This follows from the short constant gas consumption time-scale typically assumed by GCEs, which implies the presence of a readily enriched low-mass gas reservoir. When an initially longer, evolving consumption time-scale is adopted, vice reproduces the simulated galaxy’s track through the [$\alpha$/Fe]–[Fe/H] plane and its metallicity distribution function.

Analysis of Salt Marketing Strategy of Local Farmer Groups (Case Study of Labuhan Bontong Village, Tarano District)

Labuhan Bontong Village, Tarano Sub-District is one of the largest salt-producing villages in Sumbawa Regency. However, marketing issues such as limited market access, competition with imported salt, and unstable prices continue to hinder the local salt industry in this area. This research aims to determine the marketing strategies carried out by the local farmer group in Labuhan Bontong Village, Tarano Sub-District. The research uses a qualitative descriptive approach with data collection techniques including observation, interviews, and documentation. The theory used in this research is the Marketing Mix 7P theory. The results of the research show that the marketing strategy of salt by the local farmer group only shows a few strategies such as salt production carried out near the coast and the presence of physical evidence in the form of machine technology that can lift seawater into salt plots, while some do not show any strategies yet, such as pricing that still depends on time/season, promotion still through word of mouth, and the marketing process still uses sacks.

Analysis Of Local Msme Development Strategy "Vis A Vis" The Development Of National Chain Minimarket Retail In Palembang City

The phenomenon of the proliferation of National Chain Minimarket Retail Groups has become a scourge for local MSMEs in Indonesia. Although the government continues to provide space for local MSMEs through Permendagri No. 53/M-DAG/PER/12/2008 which requires the establishment of minimarkets to pay attention to the existence of traditional markets and smaller neighborhood stalls/shops. However, some regions are actually utilizing the momentum of the existence of modern minimarkets, one of which is Yogyakarta through the Mayor's Regulation which issued a policy so that the national chain minimarket retail group empowers local MSMEs and is given a special place to market local products. Palembang, which is known for its pempek as a culinary specialty, has enormous potential for the development of local MSMEs, but MSME players who become industry players are still not ideal. This study aims to analyze how the development strategy of Local MSMEs "vis a vis" the massive development of national chain minimarket retail in Palembang City. This research uses a mixed method approach, which consists of two approaches, namely quantitative and qualitative. Mixed methods used are descriptive qualitative using SWOT analysis (strengths, weaknesses, opportunities, threats) to analyze the development strategy of local MSMEs in Palembang City. As well as quantitative descriptive using the IFAS and EFAS matrix to calculate the weighting, rating, and formulation of the development strategy position of Local MSMEs in Palembang City. The results of this study indicate that based on the results of the SWOT diagram analysis, the X and Y axes are obtained. The straight line in the diagram above shows the coordinates in quadrant 1 position. Quadrant 1 is a very favorable situation, where local wisdom MSME players can have strengths and opportunities that can be utilized so that it is suitable to use the SO (strength-opportunity) strategy to develop local wisdom MSME businesses supported by aggressive growth strategies, namely 1) Maintaining Public Interest by Optimizing Support Programs from the Government; 2) Optimizing Sales Without Limiting Target Markets both domestically and abroad; 3) Utilizing Community Expertise to Intervene Local Products to National Chain Minimarkets; and Creating Training Programs from the Association of Local Culinary Business Groups to Maintain the Authentic Taste of Products.

Assessing the integration of skin screening into a mass drug administration campaign against neglected tropical diseases: A cross-sectional observational study from two districts in Côte d'Ivoire, 2023

BackgroundThe World Health Organization advocates integrating neglected tropical diseases (NTDs) into common delivery platforms to combat them in resource-constrained settings. However, limited literature exists on the benefits of integration. This study examines the feasibility and impact of adding skin screening to a mass drug administration (MDA) campaign in Côte d'Ivoire. MethodsIn June 2023, the Ministry of Health and Public Hygiene of Côte d'Ivoire piloted screening for skin-related NTDs alongside a national MDA campaign targeting soil-transmitted helminthiases and schistosomiasis. Two districts, Fresco and Koro, were selected for the pilot. The study applied both quantitative and qualitative assessments. The quantitative aspect focused on campaign costs and outputs, using an ingredient approach for costing. The qualitative evaluation employed an empirical phenomenological approach to analyze the campaign's operational feasibility and appreciation by stakeholders. FindingsMDA activities cost $0·66 per treated child and skin screening $0·62 per screened person, including medical products. The MDA campaign exceeded coverage targets in both districts, whereas skin screening coverage varied by locality and age group. Both the service delivery team and the beneficiaries expressed appreciation for the integrated campaign. However, opportunities for improvement were identified. ConclusionIntegrating MDA and skin NTD screening proved operationally feasible in this context but had not recorded cost-saving effects. The performance of the MDA campaign was not negatively affected by additional skin screening activities, but effective integration requires thorough joint planning, strengthened training, and proper supervision.

Transformasi Sampah Menjadi Sumber Daya: " Dalam Penyuluhan Pengelolaan kompos di Komunitas Parisada Hindy Dharma Semarang Selatan

This outreach examines efforts to transform waste into resources through education on compost management in the South Semarang Hindu Parisada Dharma Community. The education aims to raise awareness among the public about the importance of managing organic waste by composting as a strategy to support environmental sustainability. Suitable compost management methods tailored to community needs are selected and promoted, involving community leaders and local groups to ensure active participation and deep understanding of the waste recycling process. The outcomes of this outreach are expected to make a positive contribution by reducing the volume of organic waste going to landfills and enhancing the utilization of local potential to support overall environmental sustainability. Transforming organic waste into compost not only mitigates negative environmental impacts but also makes the community engagement initiative focused on compost management in the South Semarang Hindu Parisada Dharma Community relevant and strategic. This program is anticipated to empower the community to manage organic waste as a resource with economic and ecological value. By leveraging local potential and community wisdom, this effort can serve as an inspiring example for other communities in promoting environmental sustainability and reducing the negative impacts of waste management in general.

Blockchain-Based Caching Architecture for DApp Data Security and Delivery.

Decentralized applications (DApps) built on blockchain technology offer a promising solution to issues caused by centralization. However, traditional DApps leveraging off-chain storage face performance challenges due to factors such as storage location, network speed, and hardware conditions. For example, decentralized storage solutions such as IPFS suffer from diminished download performance due to I/O constraints influenced by data access patterns. Aiming to enhance the Quality of Service (QoS) in DApps built on blockchain technology, this paper proposes a blockchain node-based distributed caching architecture that guarantees real-time responsiveness for users. The proposed architecture ensures data integrity and user data ownership through blockchain while maintaining cache data consistency through local blockchain data. By implementing local cache clusters on blockchain nodes, our system achieves rapid response times. Additionally, attribute-based encryption is applied to stored content, enabling secure content sharing and access control, which prevents data leakage and unauthorized access in unreliable off-chain storage environments. Comparative analysis shows that our proposed system achieves a reduction in request processing latency of over 89% compared to existing off-chain solutions, maintaining cache data consistency and achieving response times within 65 ms. This demonstrates the model's effectiveness in providing secure and high-performance DApp solutions.

High pressure suppression of plasticity due to an overabundance of shear embryo formation

High pressure shear band formation is a critical phenomenon in energetic materials due to its influence on both mechanical strength and mechanochemical activation. While shear banding is known to occur in a variety of these materials, the governing dynamics of the mechanisms are not well defined for molecular crystals. We conduct molecular dynamics simulations of shock wave induced shear band formation in the energetic material 1,3,5-trinitroperhydro-1,3,5-triazine (RDX) to assess shear band nucleation processes. We find, that at high pressures, the initial formation sites for shear bands, “embryos”, form in excess and rapidly lower deviatoric stresses prior to shear band formation and growth. This results in the suppression of plastic deformation. A local cluster analysis is used to quantify and contrast this mechanism with a more typical shear banding seen at lower pressures. These results demonstrate a mechanism that is reversible in nature and that supersedes shear band formation at increased pressures. We anticipate that these results will have a broad impact on the modeling and development of high-strain rate application materials such as those for high explosives and hypersonic systems.

Plasmodium vivax genomic surveillance in the Peruvian Amazon with Pv AmpliSeq assay.

Plasmodium vivax is the most predominant malaria species in Latin America, constituting 71.5% of malaria cases in 2021. With several countries aiming for malaria elimination, it is crucial to prioritize effectiveness of national control programs by optimizing the utilization of available resources and strategically implementing necessary changes. To support this, there is a need for innovative approaches such as genomic surveillance tools that can investigate changes in transmission intensity, imported cases and sources of reintroduction, and can detect molecular markers associated with drug resistance. Here, we apply a modified highly-multiplexed deep sequencing assay: Pv AmpliSeq v2 Peru. The tool targets a newly developed 41-SNP Peru barcode for parasite population analysis within Peru, the 33-SNP vivaxGEN-geo panel for country-level classification, and 11 putative drug resistance genes. It was applied to 230 samples from the Peruvian Amazon (2007-2020), generating baseline surveillance data. We observed a heterogenous P. vivax population with high diversity and gene flow in peri-urban areas of Maynas province (Loreto region) with a temporal drift using all SNPs detected by the assay (nSNP = 2909). In comparison, in an indigenous isolated area, the parasite population was genetically differentiated (FST = 0.07-0.09) with moderate diversity and high relatedness between isolates in the community. In a remote border community, a clonal P. vivax cluster was identified, with distinct haplotypes in drug resistant genes and ama1, more similar to Brazilian isolates, likely representing an introduction of P. vivax from Brazil at that time. To test its applicability for Latin America, we evaluated the SNP Peru barcode in P. vivax genomes from the region and demonstrated the capacity to capture local population clustering at within-country level. Together this data shows that P. vivax transmission is heterogeneous in different settings within the Peruvian Amazon. Genetic analysis is a key component for regional malaria control, offering valuable insights that should be incorporated into routine surveillance.

"Exercise… to Me, It's Freedom": Motivation, Support, and Self-Management to Keep Physically Active with Parkinson's Disease: A Qualitative Study.

The benefits of exercise have been widely explored among people with Parkinson's (PwP). Exercise can improve non-motor (fatigue, pain, sleep, etc.) and motor features (balance, muscle strength, gait speed, etc.), maintain function, as well as prevent disease progression. Although the benefits are well known, PwP continue to show difficulty adhering to physical activity and exercise. This study aims to explore motivation to exercise, support, and self-management needs among people with Parkinson's, their family members, and physiotherapists. Purposeful and maximum-variation sampling methods (age, sex, geographical setting, and disease severity) were employed. PwP and family members were recruited through physiotherapy services and local support groups. Twelve semi-structured interviews with PwP and two group interviews, one with family members (n = 4) and one with physiotherapists (n = 5), were conducted. Interview guides were informed by patient-public input and a recent systematic review. Interviews were recorded, transcribed, and analysed using thematic analysis informed by the Grounded Theory methodology. Four common themes emerged: (1) The value of an intrinsic connection with exercise, for which there are challenges. A greater connection to exercise led to long-term adherence. (2) Adapting exercise to the needs and preferences of a person is essential. Preferred exercises and environments were mixed, with differences emerging between sexes. (3) Physiotherapists' aim to only maintain physical function led to frustration. Limited self-management opportunities, stigma, and dehumanisation were discussed. (4) Non-motor symptoms, stigma, fear, and determination as well as apathy, pain, and low mood were discussed. Exercise provided physical, emotional, and social rewards. Supports are necessary; however, challenges arise when PwP's motivations are mismatched to family members' and physiotherapists' goals. Co-created goals, tailored to their preferences, and exercise plans with supported self-management are recommended.

Content Analysis of YouTube™ Videos Related to Anaesthesia Practices in Circumcision Surgery in Children

Aim:The aim of our study was to evaluate the accuracy and reliability of the information provided for patients by the videos on anaesthesia applications in circumcision surgeries in children on YouTube™ video platform,an internet information source. Materyal and Methods:The keywords ‘anaesthesia in circumcision surgery’ and ‘anaesthesia in circumcision surgery in children’ were typed into the search bar on YouTube™.A total of 220 videos were watched.The date of upload, number of views,duration,number of likes and dislikes,source of upload and number of comments were recorded.The reliability and quality of the video were assessed using the Global Quality Scale(GQS) and the modified DISCERN scale. Results:After exclusion criteria, a total of 38 videos were evaluated.The videos were divided into four groups according to the anaesthetic method mentioned/recommended in the content.When compared between the groups in terms of GQS score,modified DISCERN score and video content,it was observed that the mean scores of the videos in the local anaesthesia group were statistically significantly lower than those in both general and local anaesthesia groups, separated by age(p

China’s New Housing Security Model: Evaluation of the Job–Housing Balance in Affordable Rental Housing, Shanghai

The Chinese government’s recent low-income housing scheme aims to tackle housing challenges faced by the urban floating population. A notable shift in this initiative is the focus on the job–housing balance. This study proposes that the spatial interaction between land designated for affordable rental housing and land for commercial facilities serves as a fundamental metric for evaluating this equilibrium, providing insights into the effectiveness of China’s nascent affordable housing efforts. Drawing on post-2021 data, when China’s revamped affordable housing policy took effect, our research examines the spatial distribution of affordable rental housing and commercial service land in Shanghai. By employing coupled coordination models and local entropy metrics, we delve into the supply equilibrium and pragmatic interrelation of these land types. Our findings reveal localized clustering in the spatial arrangement of rental and commercial land within Shanghai. Zones in the urban core exhibit a supply balance, while the peripheries display diminishing accessibility between these land types. Core urban areas have a lower supply balance but higher accessibility, whereas urban fringes face both low supply balance and low accessibility. These study outcomes have significant implications for strategic planning and the construction of affordable rental housing.