Proceedings of the National Academy of Sciences, India Section A: Physical Sciences最新文献_第4页

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

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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

Surface Roughness Driven Total Internal Reflection Quasi Phase Matched Broadband Second Harmonic Generation in Isotropic Semiconductor Materials 表面粗糙度驱动的全内反射准相位匹配宽带二次谐波在各向同性半导体材料中的产生

IF 1.3 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/s40010-025-00965-4

Hemant Kumar, Sumita Deb, Minakshi Deb Barma, Kritideepa Roy, Rakesh Maharana

{"title":"Surface Roughness Driven Total Internal Reflection Quasi Phase Matched Broadband Second Harmonic Generation in Isotropic Semiconductor Materials","authors":"Hemant Kumar, Sumita Deb, Minakshi Deb Barma, Kritideepa Roy, Rakesh Maharana","doi":"10.1007/s40010-025-00965-4","DOIUrl":"10.1007/s40010-025-00965-4","url":null,"abstract":"<div><p>The present study analytically investigates the effect of varying surface roughness profiles on broadband second harmonic generation in reverse tapered isotropic slab configuration of ZnSe, GaAs and ZnTe crystals using total internal reflection-quasi phase matching technique. The effect of optical losses including surface roughness, absorption and scattering due to reflection has been studied. Gaussian random and non-Gaussian random rough surface profiles have been generated digitally with the help of MATLAB software, to compare different parametric variations. The simulation results show that random rough surface profile with non-Gaussian distribution has more efficiency but less bandwidth than that for rough profile with Gaussian distribution function for ZnSe and GaAs crystals. However, for ZnTe crystal, the case is reversed. The impact of varying slab length, thickness and temperature on the performance parameters have been taken into account for both the random and cumulative surface roughness profiles.</p></div>","PeriodicalId":744,"journal":{"name":"Proceedings of the National Academy of Sciences, India Section A: Physical Sciences","volume":"96 2","pages":"173 - 184"},"PeriodicalIF":1.3,"publicationDate":"2025-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148496678","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

Smart Pot Hole Detection System 智能井眼检测系统

IF 1.2 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2025-12-04 DOI: 10.1007/s40010-025-00961-8

Brijesh Kundaliya, Upesh Patel, Divyarajsinh Rana, Krutyanjay Shinde, Harsh Pandya

{"title":"Smart Pot Hole Detection System","authors":"Brijesh Kundaliya, Upesh Patel, Divyarajsinh Rana, Krutyanjay Shinde, Harsh Pandya","doi":"10.1007/s40010-025-00961-8","DOIUrl":"10.1007/s40010-025-00961-8","url":null,"abstract":"<div><p>This research paper presents an embedded system for detecting potholes that can be installed on a two-wheeler vehicle. In cities, poor roads and potholes can cause fatalities, and financial losses, and hinder economic growth. The proposed system uses an ESP32, accelerometer, gyroscope, and GPS module to detect potholes and store their location on a cloud-based database to address this issue. A mobile application then displays the potholes’ location on a map. The study emphasizes the importance of road condition monitoring to promote accountability and transparency, and the proposed system offers an affordable, low-maintenance, and fast solution. The study’s goal is to create a system that can be installed on two-wheelers to monitor road conditions and record GPS coordinates of potholes. The research results can help reduce accidents caused by potholes and lead to the more efficient allocation of road repair resources. “A Smart Pot Hole Detection System is an embedded technology-driven solution designed to identify and monitor potholes in roads and streets. A smart system for detecting potholes can help identify and address these issues more efficiently. Here are the key components and features of such a system: Sensors, Data Processing, Real-time Monitoring, Data Logging, Mobile Apps and Alerts, Connectivity, Predictive Maintenance, Cost Reduction, Data Sharing and Environmental Considerations are important. Smart pothole detection systems can be a valuable tool for improving road infrastructure and ensuring safer and smoother travel for motorists.”</p></div>","PeriodicalId":744,"journal":{"name":"Proceedings of the National Academy of Sciences, India Section A: Physical Sciences","volume":"96 1","pages":"145 - 154"},"PeriodicalIF":1.2,"publicationDate":"2025-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147614775","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

Some Investigations on η-Ricci Solitons in a Bochner Flat Lorentzian Kähler Space-Time Manifold 关于Bochner平坦洛伦兹Kähler时空流形中η-Ricci孤子的一些研究

IF 1.2 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2025-12-04 DOI: 10.1007/s40010-025-00955-6

B. B. Chaturvedi, Prabhawati Bhagat, Ratnesh Kumar Mishra

引用次数: 0

A Comprehensive Study on Schottky Diode for High-Speed Application 高速肖特基二极管的综合研究

IF 1.3 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2025-12-03 DOI: 10.1007/s40010-025-00963-6

Amit Kumar, Mohan Kumar Paswan, Pratyush Panda, Anmol Agarwal

引用次数: 0