Proceedings of the National Academy of Sciences, India Section A: Physical Sciences最新文献_第9页

Influence of Hardener Type on the Particleboard Properties at Industrial Scale 工业规模下硬化剂类型对刨花板性能的影响

IF 0.8 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2025-02-18 DOI: 10.1007/s40010-025-00910-5

O. Çamlıbel, M. Aydın, E. Koç

{"title":"Influence of Hardener Type on the Particleboard Properties at Industrial Scale","authors":"O. Çamlıbel, M. Aydın, E. Koç","doi":"10.1007/s40010-025-00910-5","DOIUrl":"10.1007/s40010-025-00910-5","url":null,"abstract":"<div><p>Influence of the two different hardeners (ammonium chloride NH<sub>4</sub>Cl and ammonium sulphate (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub>) on the physical (density, thickness, moisture content, thickness swelling and water absorption) and mechanical (modulus of rupture, modulus of elasticity, surface soundness and internal bonding strength) properties and formaldehyde emission of the particleboard was figured out. Boards were industrially produced (at continuous press line) using urea formaldehyde resin, liquid paraffin, and a 50:40:10 mixture of Scots pine, oak and poplar chips, respectively. Except for elasticity, boards produced using ammonium chloride had better mechanical properties, but their thickness swelling and water absorption capabilities were lower (approx. 55.5% and 45.9%, respectively) than those produced with ammonium sulphate. Utilization of ammonium chloride provided 30.3% higher surface soundness. There were less than 1% differences in the thickness and density. Around 36.4% less formaldehyde emission was determined for ammonium chloride-modified boards. According to the results, only means of IB did not present statistically significant differences.</p></div>","PeriodicalId":744,"journal":{"name":"Proceedings of the National Academy of Sciences, India Section A: Physical Sciences","volume":"95 1","pages":"33 - 40"},"PeriodicalIF":0.8,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143809277","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 Convergence of Strong Cylindrical and Spherical Shock Waves in Solid Materials 固体材料中强圆柱和强球形激波的收敛性

IF 0.8 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2025-02-01 DOI: 10.1007/s40010-025-00909-y

R. K. Anand

{"title":"On the Convergence of Strong Cylindrical and Spherical Shock Waves in Solid Materials","authors":"R. K. Anand","doi":"10.1007/s40010-025-00909-y","DOIUrl":"10.1007/s40010-025-00909-y","url":null,"abstract":"<div><p>In this article, we present a description of the behaviour of shock-compressed solid materials following Geometrical Shock Dynamics (GSD) theory. GSD has been successfully applied to various gas dynamics problems, and here we have employed it to investigate the propagation of cylindrically and spherically symmetric converging shock waves in solid materials. The analytical solution of shock dynamics equations has been obtained in the strong-shock limit, assuming the solid materials to be homogeneous and isotropic and obeying the Mie-Grüneisen equation of state. The non-dimensional expressions are obtained for the velocity of shock, the pressure, the mass density, the particle velocity, the temperature, the speed of sound, the adiabatic bulk modulus, and the change-in-entropy behind the strong converging shock front. The influences as a result of changes in (i) the propagation distance <i>r</i> from the axis or centre <span>((r=0))</span> of convergence, (ii) the Grüneisen parameter, and (iii) the material parameter are explored on the shock velocity and the domain behind the converging shock-front. The results show that as the shock focuses at the axis or origin, the shock velocity, the pressure, the temperature, and the change-in-entropy increase in the shock-compressed titanium Ti6Al4V, stainless steel 304, aluminum 6061-T6, etc.</p></div>","PeriodicalId":744,"journal":{"name":"Proceedings of the National Academy of Sciences, India Section A: Physical Sciences","volume":"95 1","pages":"103 - 112"},"PeriodicalIF":0.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143809100","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

Ranking of Generalized Trapezoidal Fuzzy Numbers by Point of Intersection and its Application in Multi Criteria Decision Making Problems 按交点排列广义梯形模糊数及其在多标准决策问题中的应用

IF 0.8 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2025-01-30 DOI: 10.1007/s40010-025-00907-0

P. G. Patil, S. Shivashankar, Vyshakha Elluru

引用次数: 0

Multi-Zone Fence Perimeter Surveillance: A New Edge-FOG Architecture for Efficient Detection and Classification of Intrusion 多区域围栏周界监控：一种新的边缘雾结构，用于有效检测和分类入侵

IF 0.8 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2024-12-29 DOI: 10.1007/s40010-024-00904-9

Srinivasan Aruchamy, Anisom Chakraborty, Siva Ram Krishna Vadali, Manisha Das

{"title":"Multi-Zone Fence Perimeter Surveillance: A New Edge-FOG Architecture for Efficient Detection and Classification of Intrusion","authors":"Srinivasan Aruchamy, Anisom Chakraborty, Siva Ram Krishna Vadali, Manisha Das","doi":"10.1007/s40010-024-00904-9","DOIUrl":"10.1007/s40010-024-00904-9","url":null,"abstract":"<div><p>In this paper, we propose a geophone based fence surveillance system with a FOG architecture for detection of intrusion and classification in spatially separated zones. In the proposed decentralized architecture − for edge layer we propose an efficient spectral-energy-comparison detector; and at FOG layer, we propose a highly accurate supervised machine learning algorithm in the form of linear support vector machine for classification of mode of intrusion; lastly, the FOG layer updates the intrusion status of respective zones to the cloud layer. Extensive analysis of field experimental data acquired with an ad hoc geographically distributed fence setup indicates that the proposed detector renders <span>(99%)</span> accuracy with very low false alarm rate and also outperforms known detectors. We perform feature engineering and demonstrate that the proposed classifier achieves <span>(97.9%)</span> accuracy for both man-made intrusions and natural events even with reduced feature set. We also show that the proposed classifier outperforms known fence perimeter surveillance schemes. Lastly, we validate the performance of proposed system through real life experiments and analysis therein.</p></div>","PeriodicalId":744,"journal":{"name":"Proceedings of the National Academy of Sciences, India Section A: Physical Sciences","volume":"95 1","pages":"17 - 32"},"PeriodicalIF":0.8,"publicationDate":"2024-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143809209","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

Correction: Bias Correction and Trend Analysis of Temperature and Rainfall in Eastern India 更正：印度东部气温和降雨量的偏差修正与趋势分析

IF 0.8 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2024-12-13 DOI: 10.1007/s40010-024-00906-7

Rajiv Kumar Srivastava, Biplab Sadhukhan, Arun Chakraborty, Rabindra Kumar Panda

引用次数: 0

A New Mean-Variance-Skewness Model for Portfolio Optimization Using Three-Part Zigzag Uncertain Variable 基于三部分之字形不确定变量的投资组合优化均值-方差-偏度新模型

IF 0.8 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2024-12-13 DOI: 10.1007/s40010-024-00905-8

Sanjoy Chhatri, Debasish Bhattacharya

{"title":"A New Mean-Variance-Skewness Model for Portfolio Optimization Using Three-Part Zigzag Uncertain Variable","authors":"Sanjoy Chhatri, Debasish Bhattacharya","doi":"10.1007/s40010-024-00905-8","DOIUrl":"10.1007/s40010-024-00905-8","url":null,"abstract":"<div><p>A multi-objective portfolio selection problem involving newly introduced stocks has been studied here, and an innovative solution procedure for the same with a numerical illustration is also provided. The returns of these stocks are represented by a new uncertainty distribution, called the three-part zigzag uncertainty distribution, introduced in this paper. This newly defined uncertainty distribution function is regular and closer to an <i>S</i>-shaped curve than linear and zigzag uncertainty distribution functions. The properties of the three-part zigzag uncertainty distribution are studied, and the expression for the general order central moment of the distribution has been obtained. Using the expected value and the second, third order central moments, two maximizing objectives and one minimizing objective for the said optimization purpose are formed. Finally, using the “fmincon” function in Matlab 2018a, the constructed problem is solved. The solution obtained has been interpreted. The fact that it yields an efficient or Pareto optimal solution has also been proven.</p><p><b>Significance Statement </b> A three-objective portfolio selection problem in an uncertain situation has been constructed using a newly defined uncertainty distribution. An innovative solution procedure that elicits efficient solutions is suggested to solve the problem. The work done can be applied to solve real-life portfolio selection problems with better accuracy.</p></div>","PeriodicalId":744,"journal":{"name":"Proceedings of the National Academy of Sciences, India Section A: Physical Sciences","volume":"95 1","pages":"55 - 70"},"PeriodicalIF":0.8,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143809178","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

Diameter Estimation of ((m,rho ))-Quasi Einstein Manifolds 准爱因斯坦流形的直径估计

IF 0.8 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2024-11-10 DOI: 10.1007/s40010-024-00899-3

Absos Ali Shaikh, Prosenjit Mandal, Chandan Kumar Mondal

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IoT Adoption for Smart Cities Waste Management using Pythagorean Fuzzy MEREC-SWARA-ARAS Method 利用毕达哥拉斯模糊 MEREC-SWARA-ARAS 方法实现物联网应用于智能城市废物管理

IF 0.8 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2024-11-10 DOI: 10.1007/s40010-024-00902-x

Rishikesh Chaurasiya, Divya Jain

引用次数: 0

Rate of Convergence of (lambda)-Bernstein-Beta type operators 伯恩斯坦-贝塔型算子的收敛率

IF 0.8 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2024-11-08 DOI: 10.1007/s40010-024-00903-w

Abhishek Senapati, Ajay Kumar, Tanmoy Som

引用次数: 0

Stability Analysis of Hybrid Nanofluid with Inclined MHD and Joule Effects: Flow Reversal and Flow Separation 具有倾斜 MHD 和焦耳效应的混合纳米流体的稳定性分析：流动逆转与流动分离

IF 0.8 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2024-11-07 DOI: 10.1007/s40010-024-00900-z

Ch. RamReddy, Har Lal Saran

{"title":"Stability Analysis of Hybrid Nanofluid with Inclined MHD and Joule Effects: Flow Reversal and Flow Separation","authors":"Ch. RamReddy, Har Lal Saran","doi":"10.1007/s40010-024-00900-z","DOIUrl":"10.1007/s40010-024-00900-z","url":null,"abstract":"<div><p>In this paper, we have analyzed the stability of multiple solutions for the forced convective flow of Ti-alloy-MWCNT and water-based hybrid nanofluid with inclined MHD and Joule effects over an exponentially shrinking sheet. To provide the mathematical modeling of hybrid nanofluid, the Choi and Eastman model has been adopted. The flow governing equations arising from this analysis are converted into a system of ODEs using suitable similarity variables and then solved numerically using the shooting method. The graphical representations of the results are illustrated to elaborate interesting features in the presence of physically effective parameters like inclined magnetic field, Joule parameter, volume fraction, and suction parameters. As a result, we noticed the existence of dual solutions within the limited range of inclined magnetic, shrinking, and suction parameters. Hence, the stability of these solutions is checked by using temporal stability analysis. Further, we noticed that first solution is stable, whereas second solution is unstable through the smallest eigenvalue approach. Also, the streamlines are displayed to visualize the flow patterns. Moreover, the flow separation point and the flow reversal are identified. Finally, the delay of boundary layer separation is pointed out.</p></div>","PeriodicalId":744,"journal":{"name":"Proceedings of the National Academy of Sciences, India Section A: Physical Sciences","volume":"94 5","pages":"519 - 532"},"PeriodicalIF":0.8,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714509","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