Proceedings of the National Academy of Sciences, India Section A: Physical Sciences最新文献

Microbial Fuel Cells: Sustainable Energy Solutions for Wastewater Treatment-A Mini Review 微生物燃料电池：废水处理的可持续能源解决方案综述

IF 1.2 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2026-01-03 DOI: 10.1007/s40010-025-00960-9

Morteza Esfandyari, Dariush Jafari

引用次数: 0

Coinfection Dynamics of Tuberculosis with Other Infectious Diseases—A Mathematical Study 结核病与其他传染病共感染动力学的数学研究

IF 1.2 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2026-01-02 DOI: 10.1007/s40010-025-00946-7

Aditya Pandey, Archana Singh Bhadauria

引用次数: 0

Green Synthesis of Covellite CuS Nanoparticles for BLEDs 用于BLEDs的covelite cu纳米颗粒的绿色合成

IF 1.2 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2025-12-19 DOI: 10.1007/s40010-025-00947-6

Yukti Gupta, Neena Jaggi

{"title":"Green Synthesis of Covellite CuS Nanoparticles for BLEDs","authors":"Yukti Gupta, Neena Jaggi","doi":"10.1007/s40010-025-00947-6","DOIUrl":"10.1007/s40010-025-00947-6","url":null,"abstract":"<div><p>In the present study, tulsi extract mediated hydrothermal method is utilized for the synthesis of Covellite CuS nanoparticles. To optimize the synthesised nanoparticles for their application in Blue Light Emitting Diode (BLEDs), the effect of reaction time on their structural and optical properties, was studied at 100 °C for 8 h, 12 h, and 16 h. Here, a biomolecule eugenol present in tulsi extract acted as a good reducing, stabilizing, and catalytic agent. The diffraction and morphological studies were conducted using X-Ray Diffraction and Field Emission Scanning Electron Microscopy analysis respectively. The particle size decreases with the increase in reaction time and the structural parameters matched well with the covellite CuS hexagonal phase prepared at 12 h reaction time. Ultraviolet-visible absorption studies reveal that the bandgap of nanoparticles was found in the range of 3.64–3.8 eV. The Photoluminescence spectroscopy and CIE chromaticity plot reveal that the sample synthesized at 12 h has a low recombination rate and emits light in the blue region which suggests that it can be utilized in devices like blue LEDs and lamps. Statement of relevance. In the present study, the green synthesis approach is adopted by using Tulsi extract as a solvent for synthesizing Covellite CuS nanoparticles via the hydrothermal route. The optical properties of synthesized sample reveal that the sample can be a potential n-type material for Blue LEDs.</p></div>","PeriodicalId":744,"journal":{"name":"Proceedings of the National Academy of Sciences, India Section A: Physical Sciences","volume":"96 1","pages":"33 - 41"},"PeriodicalIF":1.2,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147611964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the (A_{alpha }) matrix over finite metacyclic groups 有限亚环群上(A_{alpha })矩阵

IF 1.2 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2025-12-12 DOI: 10.1007/s40010-025-00933-y

Aditya Singh, Yogendra Singh, Anand Kumar Tiwari, S. Pirzada

引用次数: 0

Statistical Relationship Between Shear Wave Velocity and Penetration Resistance in Indo-Gangetic Plain, Northern India 印度北部恒河平原横波速度与穿透阻力的统计关系

IF 1.2 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2025-12-12 DOI: 10.1007/s40010-025-00953-8

Pawan Kumar Yadav, Uma Shankar, A. P. Singh

{"title":"Statistical Relationship Between Shear Wave Velocity and Penetration Resistance in Indo-Gangetic Plain, Northern India","authors":"Pawan Kumar Yadav, Uma Shankar, A. P. Singh","doi":"10.1007/s40010-025-00953-8","DOIUrl":"10.1007/s40010-025-00953-8","url":null,"abstract":"<div><p>Earthquake mitigation and soil investigation for seismic hazard analysis in a potentially active seismic zone around the southern Himalayan region are significant concerns. Since the alluvium soil deposits have a substantial effect on the amplitude of ground motion during earthquake energy transmission. In evaluating the soil stiffness of the layer overlying bedrock; it is necessary to measure the shear wave velocity (SWV) of the soil horizon. To calculate SWV, microtremor array measurements (MAM) were performed nearby borehole locations drilled to a depth of 30 m with standard penetration test blow counts (SPT) N values. This study presents power regression analysis to establish a relationship between SWV and SPT-N values. The laboratory analysis of index properties was conducted concurrently with the collecting of soil samples from boreholes. The lithology extracted from the drilled borehole has shown that the clay is of low plasticity, with dominant silty sand followed by medium to fine-grained sand to a depth of 30 m. The established empirical relationship in this study suggests a correlation coefficient (R<sup>2</sup>) value of 0.554 for uncorrected N values showing a reasonably strong correlation, and 0.402 for corrected N values (overburden correction), indicating a moderate correlation. Accordingly, uncorrected SPT-N values indicate that shear wave velocity strongly correlates with in-situ conditions with a correlation coefficient (R<sup>2</sup>) of 0.554 for all types of soil. As per the National Earthquake Hazards Reduction Program (NEHRP) classification, the study area comes under class D soil based on shear wave velocity and N values. In addition, a new empirical relationship was established between SWV and SPT-N values in the Indo-Gangetic Plain (IGP) used for mitigation of seismic hazards and vigilance in geotechnical engineering applications.</p></div>","PeriodicalId":744,"journal":{"name":"Proceedings of the National Academy of Sciences, India Section A: Physical Sciences","volume":"96 1","pages":"65 - 76"},"PeriodicalIF":1.2,"publicationDate":"2025-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147611968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic Resource Allocation Based on Multi-modal Foraging by Honey Bee Swarms 基于蜂群多模态觅食的动态资源分配

IF 1.2 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2025-12-12 DOI: 10.1007/s40010-025-00956-5

S. S. Vinod Chandra, R Saritha

引用次数: 0

Futuristic Assessment of the Impact of Shock Waves in Supersonic Passenger Aircraft 超音速客机冲击波影响的未来评估

IF 1.2 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2025-12-06 DOI: 10.1007/s40010-025-00962-7

Lakshmanan Kasi, Perarasu Thangavelu

{"title":"Futuristic Assessment of the Impact of Shock Waves in Supersonic Passenger Aircraft","authors":"Lakshmanan Kasi, Perarasu Thangavelu","doi":"10.1007/s40010-025-00962-7","DOIUrl":"10.1007/s40010-025-00962-7","url":null,"abstract":"<div><p>The realm of high-speed aviation, driven by the aerospace industry’s pursuit of top-tier air transport performance, has ushered in the era of supersonic aircraft. These aircraft offer rapid and secure access to long-distance destinations, yet the presence of shock waves introduces complexities influencing maneuverability and aircraft characteristics. This comprehensive review delves into the potential ramifications of shock waves in the context of commercial supersonic aircraft. It introduces and categorizes shock waves based on their attachment to the aircraft. The review explores experimental studies and numerical approaches to understand flow characteristics essential for commercial supersonic transport. The primary objective is to establish a clear conceptual framework for shock waves in commercial supersonic aircraft, facilitating real-time elucidation of shock wave mechanisms in complex scenarios. This review recognizes the challenges posed by shock waves and paves the way for an informed and collaborative approach to harness the full potential of commercial supersonic aviation.</p></div>","PeriodicalId":744,"journal":{"name":"Proceedings of the National Academy of Sciences, India Section A: Physical Sciences","volume":"96 1","pages":"165 - 172"},"PeriodicalIF":1.2,"publicationDate":"2025-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40010-025-00962-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147611962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficient and Robust Estimators for the Population Mean of Non-normally Distributed and Contaminated Data 非正态分布和污染数据总体均值的有效鲁棒估计

IF 1.2 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2025-12-06 DOI: 10.1007/s40010-025-00957-4

Aamir Majeed Chaudhary, Aamir Sanaullah, Muhammad Hanif, Iram Saleem, Prayas Sharma

{"title":"Efficient and Robust Estimators for the Population Mean of Non-normally Distributed and Contaminated Data","authors":"Aamir Majeed Chaudhary, Aamir Sanaullah, Muhammad Hanif, Iram Saleem, Prayas Sharma","doi":"10.1007/s40010-025-00957-4","DOIUrl":"10.1007/s40010-025-00957-4","url":null,"abstract":"<div><p>The development of estimators that remain efficient under both normal and nonnormal conditions remains a critical challenge in statistical inference, particularly in the presence of data contamination and outliers. While several estimation methods have been proposed in the literature, limited attention has been given to constructing robust and highly efficient estimators within the broader class of long-tailed symmetric (LTS) distributions. This study addresses this gap by proposing new robust estimators for the population mean based on two distinct estimation approaches: Tiku’s modified maximum likelihood estimation (MMLE) and Lloyd’s generalized least squares estimation (GLSE). These methods are particularly suited to handle departures from normality and are applicable across the entire LTS family of distributions. The performance of the proposed estimators is assessed and compared with existing conventional estimators. Key performance indicators such as mean square errors (MSEs) and asymptotic relative efficiencies (REs) are computed using extensive Monte Carlo simulations. The results indicate that the proposed estimators outperform their traditional counterparts in small sample settings and demonstrate increasing efficiency and decreasing MSEs as sample size grows. A real-data application is also provided to illustrate the practical utility and robustness of the proposed estimators in real-world scenarios. This study contributes to the existing literature by offering a flexible and reliable estimation strategy that enhances inference in settings characterized by long-tailed behavior and nonnormality.</p></div>","PeriodicalId":744,"journal":{"name":"Proceedings of the National Academy of Sciences, India Section A: Physical Sciences","volume":"96 1","pages":"103 - 126"},"PeriodicalIF":1.2,"publicationDate":"2025-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147614776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Theoretical Linear Attenuation and Scattering Coefficients of Polymethyl Methacrylate 聚甲基丙烯酸甲酯的理论线性衰减和散射系数

IF 1.2 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2025-12-06 DOI: 10.1007/s40010-025-00959-2

A. BÖKE

{"title":"The Theoretical Linear Attenuation and Scattering Coefficients of Polymethyl Methacrylate","authors":"A. BÖKE","doi":"10.1007/s40010-025-00959-2","DOIUrl":"10.1007/s40010-025-00959-2","url":null,"abstract":"<div><p>Polymethyl methacrylate (PMMA, C<sub>5</sub>H<sub>8</sub>O<sub>2</sub>) is widely used as a human breast tissue equivalent in medical X-ray technology. PMMA is preferred for reference and dosimetry measurements due to the resemblance in breast tissue’s attenuation and scattering characteristics. This study aims to correctly obtain the theoretical linear attenuation coefficients and the differential linear coherent scattering profile of PMMA. The calculations were produced by numerical integration based on the diffraction properties and small-angle scattering. The results were obtained with a different approach method and compared with experimental and theoretical counterparts. The close similarities of PMMA to attenuation and scattering properties of carcinoma and fibroglandular breast tissues were shown in the mammography energy range. When the theoretical linear attenuation coefficients were compared with the XCOM data widely used in the literature, it was seen that the present results were 7.02–12.10% closer to the experimental findings than the XCOM data in the energy range of 20–30 keV. The attenuation coefficients are of great interest to medical research. We strongly believe that our results will give valuable information for breast tissue characterization and modeling in MC code.</p></div>","PeriodicalId":744,"journal":{"name":"Proceedings of the National Academy of Sciences, India Section A: Physical Sciences","volume":"96 1","pages":"139 - 143"},"PeriodicalIF":1.2,"publicationDate":"2025-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147611967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Theoretical Prediction of Thermal Pressure for some Oxide Minerals 某些氧化矿物热压力的理论预测

IF 1.2 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2025-12-05 DOI: 10.1007/s40010-025-00954-7

Anjani K. Pandey, Prachi Singh, Shivam Srivastava, Chandra K. Dixit, Shipra Tripathi

引用次数: 0