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

Multiplicative Version of First Zagreb Index in Fuzzy Graph and its Application in Crime Analysis 模糊图中第一萨格勒布指数的乘法版本及其在犯罪分析中的应用

IF 0.8 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2023-12-23 DOI: 10.1007/s40010-023-00868-2

Sk Rabiul Islam, Madhumangal Pal

{"title":"Multiplicative Version of First Zagreb Index in Fuzzy Graph and its Application in Crime Analysis","authors":"Sk Rabiul Islam, Madhumangal Pal","doi":"10.1007/s40010-023-00868-2","DOIUrl":"10.1007/s40010-023-00868-2","url":null,"abstract":"<div><p>The multiplicative first Zagreb index is discussed in this paper and studied for fuzzy graphs. Bounds of this index are calculated for path, cycle, star, complete fuzzy graph, partial fuzzy subgraph, etc. For an isomorphic fuzzy graph, it is shown that the value of this index is the same. Some interesting relations are established among the first Zagreb index, F-index and multiplicative first Zagreb index for a fuzzy graph. The bounds of this index are studied for some fuzzy graph operations. Also, the crime of kidnapping and abduction in metropolitan cities in India is analyzed by this index. <b>Significant Statement: </b> Topological indices for a crisp graph have applications in real life. But sometimes, it is seen that most real-life problems cannot be modeled using crisp graphs. Also, laboratory testing of chemicals to understand their different properties are costly. To overcome this, many topological indices have been presented in theoretical chemistry. Those topological indices are needed to define for a fuzzy graph for these circumstances.</p></div>","PeriodicalId":744,"journal":{"name":"Proceedings of the National Academy of Sciences, India Section A: Physical Sciences","volume":"94 1","pages":"127 - 141"},"PeriodicalIF":0.8,"publicationDate":"2023-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40010-023-00868-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139030430","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

A New Hybrid Precoding-Partial Transmit Sequence Method for PAPR Reduction in Multicarrier Wireless Communication Systems 用于降低多载波无线通信系统 PAPR 的新型混合编码-部分传输序列方法

IF 0.8 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2023-12-18 DOI: 10.1007/s40010-023-00866-4

S. Sathish Kumar, V. J. Arulkarthick, Arvind Chakrapani, G. Sasikala

{"title":"A New Hybrid Precoding-Partial Transmit Sequence Method for PAPR Reduction in Multicarrier Wireless Communication Systems","authors":"S. Sathish Kumar, V. J. Arulkarthick, Arvind Chakrapani, G. Sasikala","doi":"10.1007/s40010-023-00866-4","DOIUrl":"10.1007/s40010-023-00866-4","url":null,"abstract":"<div><p>Modern broadband and data communication systems strongly rely on the principles of orthogonal frequency division multiplexing (OFDM) for effective high speed data transfer between wireless systems and devices. But the underlying OFDM scheme has large peak to average power ratio (PAPR) value associated with it which can severely affect the overall system’s performance by degrading the bit error rate (BER) performance and increasing the out of band radiation. This article proposes a precoder-based partial transmit sequence (P-PTS) method in which the OFDM signal is precoded in order to reduce the out of band radiation and maintain the BER performance, while the PTS scheme is used to reduce the PAPR value. The effectiveness of P-PTS is validated for a 16 QAM modulated OFDM signal with 1024 subcarriers when transmitted over additive white Gaussian Noise (AWGN) channel and Rayleigh channel to the OFDM receiver section. The simulation analysis ensures that PAPR reduction is achieved by nearly 50% when compared to the original OFDM signal without degrading the BER performance.</p></div>","PeriodicalId":744,"journal":{"name":"Proceedings of the National Academy of Sciences, India Section A: Physical Sciences","volume":"94 2","pages":"193 - 199"},"PeriodicalIF":0.8,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138715108","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

Numerical Characterization on the Influence of Flame Tube Geometry and Dump Gap in the Diffuser Performance at High Altitudes 火焰管几何形状和倾卸间隙对高海拔地区扩散器性能影响的数值分析

IF 0.8 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2023-12-18 DOI: 10.1007/s40010-023-00865-5

J. Bruce Ralphin Rose, L. Prawin

{"title":"Numerical Characterization on the Influence of Flame Tube Geometry and Dump Gap in the Diffuser Performance at High Altitudes","authors":"J. Bruce Ralphin Rose, L. Prawin","doi":"10.1007/s40010-023-00865-5","DOIUrl":"10.1007/s40010-023-00865-5","url":null,"abstract":"<div><p>In the present work, numerical investigation is carried out on the effect of dump gap and geometry in the performance characteristics of dump combustor diffuser. Dump gap ratio is the essential quantity that determines the losses and the radius of curvature of the flow at the exit plane. The effect of altitude on the pressure and temperature distributions of the dump diffuser is studied numerically through the SST <i>k − ω</i> turbulence model. A novel dome geometric shape optimization strategy is proposed adjacent to the flame tube head, and the effective flow pattern and pressure distribution caused by the dome shapes are analyzed using ANSYS. The dump gap ratio about 1.1 with optimized dome shapes offers better results as compared to the others in terms of static pressure recovery. The temperature and pressure distributions of the optimized geometry are validated with the existing state-of-the-art parametric studies, and the results are presented. Relevance of the work: the proposed numerical investigation on the influence of dump gap and flame tube geometry in the diffuser performance has several technical merits toward the core functions of a gas turbine engine specifically at high altitudes. The state-of-the-art pressure recovery retention mechanism can also be deployed for various physical flow environments to attain the specific values for the primitive variables as discussed in this article.</p></div>","PeriodicalId":744,"journal":{"name":"Proceedings of the National Academy of Sciences, India Section A: Physical Sciences","volume":"94 1","pages":"47 - 61"},"PeriodicalIF":0.8,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138714980","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

An Educational Study of Electromagnetic Phenomena on Ferromagnetic Structure Using a Software Environment 利用软件环境对铁磁结构电磁现象的教育研究

IF 0.8 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2023-12-16 DOI: 10.1007/s40010-023-00864-6

Necibe Fusun Oyman Serteller

{"title":"An Educational Study of Electromagnetic Phenomena on Ferromagnetic Structure Using a Software Environment","authors":"Necibe Fusun Oyman Serteller","doi":"10.1007/s40010-023-00864-6","DOIUrl":"10.1007/s40010-023-00864-6","url":null,"abstract":"<div><p>The solution to electromagnetic problems relies on complex numerical differential equations that are difficult to understand. Therefore, it is crucial to analyze them step by step and visualize them in a computer environment, even by developing a program. This approach enhances understanding of the subject and facilitates further research. In this study, an electromagnetic phenomenon is examined on a ferromagnetic structure using the Maxwell 2D static-elliptical partial differential equation within a developed software environment. The paper covers all aspects, ranging from the mathematical model and analysis solution to the fundamental operating parameters and characteristics, with a focus on educational purposes. The modeling and software development have been executed in a user-friendly manner, enabling students to apply various numerical techniques to practical problems while maintaining control over the entire modeling process. Through this study, it is anticipated that the transition from theory to practice can be facilitated more smoothly and directly. The theoretical analysis has been conducted using Mathematica software, and a comparison with finite element magnetic method simulation on a typical magnetic structure has been presented to illustrate the analogy. A comprehensive analysis of the Maxwell static-elliptical electromagnetic equation, based on a 2D numerical solution within a specific domain, has been performed in a detailed and unambiguous manner, utilizing different equation forms, boundary conditions, and ferromagnetic materials, all for educational purposes.</p></div>","PeriodicalId":744,"journal":{"name":"Proceedings of the National Academy of Sciences, India Section A: Physical Sciences","volume":"94 1","pages":"37 - 45"},"PeriodicalIF":0.8,"publicationDate":"2023-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40010-023-00864-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138692659","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

Effect of Environmental Gradient on Organic Carbon Stock of Wacho Forest Soil, South Western Ethiopia 环境梯度对埃塞俄比亚西南部瓦乔森林土壤有机碳储量的影响

IF 0.8 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2023-12-07 DOI: 10.1007/s40010-023-00859-3

Gezahegn Gashu, Halid Awoke

引用次数: 0

High Order Predictor–Corrector Cubic B-Spline Collocation Method for Modeling Solitary Waves 孤立波建模的高阶预测校正三次b样条配点法

IF 0.8 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2023-11-25 DOI: 10.1007/s40010-023-00861-9

Bülent Saka, Ozlem Ersoy Hepson, İdris Dağ

引用次数: 0

Emission of Polycyclic Aromatic Hydrocarbons from Co-combustion of Coal and Corncob 煤与玉米芯共燃烧过程中多环芳烃的排放

IF 0.8 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2023-11-24 DOI: 10.1007/s40010-023-00862-8

Reginald E. Masto, Pradeep K. Verma, Ashis Mukherjee, Lal C. Ram, Joshy George, Manish Kumar, Santi G. Sahu, Pinaki Sarkar, Sanjay K. Thakur

{"title":"Emission of Polycyclic Aromatic Hydrocarbons from Co-combustion of Coal and Corncob","authors":"Reginald E. Masto, Pradeep K. Verma, Ashis Mukherjee, Lal C. Ram, Joshy George, Manish Kumar, Santi G. Sahu, Pinaki Sarkar, Sanjay K. Thakur","doi":"10.1007/s40010-023-00862-8","DOIUrl":"10.1007/s40010-023-00862-8","url":null,"abstract":"<div><p>The emission of polycyclic aromatic hydrocarbons (PAHs) due to coal co-combustion with corncob (0, 10, 20, and 30%) was studied through a pilot scale drop tube furnace. Total PAHs (∑PAH) emission (gas + particulate) increased linearly from 19.4 µg/m<sup>3</sup> for coal combustion to 31.6, 39.8, and 42.0 µg/m<sup>3</sup> for 10, 20, and 30% corncob blends, respectively. Low-molecular-weight PAHs dominated the gas phase; medium- and high-molecular-weight PAHs in the particle phase. Naphthalene is the most prominent PAH in the gas phase. Emission of benzo[a]pyrene, increased by 45.9% at 10% corncob blend. However, its emission decreased by − 19.1% and − 87.3% for 20 and 30% corncob blends. Toxicity equivalence was also relatively higher for the 10% corncob blend but decreased greatly at 20 and 30% blends. For coal combustion, PAHs are generated due to the pyrolysis process, whereas for coal-corncob co-combustion, pyro-synthesis is the major route of PAH formation, as the PAH content was maximum at the later stage of combustion, i.e., at the bottom zone of the furnace. This study indicated that a minimum of 20% blending of corncob is required to achieve the beneficial effect of coal co-combustion in decreasing the emission of toxic PAHs.</p></div>","PeriodicalId":744,"journal":{"name":"Proceedings of the National Academy of Sciences, India Section A: Physical Sciences","volume":"94 1","pages":"17 - 25"},"PeriodicalIF":0.8,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138514972","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

Experimental Investigation on Structural, Optical, Electrical and Magnetic Properties of Copper Oxide Nanoparticles 氧化铜纳米颗粒结构、光学、电学和磁性能的实验研究

IF 0.8 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2023-11-23 DOI: 10.1007/s40010-023-00855-7

S. Atchaya, J. Meena Devi

{"title":"Experimental Investigation on Structural, Optical, Electrical and Magnetic Properties of Copper Oxide Nanoparticles","authors":"S. Atchaya, J. Meena Devi","doi":"10.1007/s40010-023-00855-7","DOIUrl":"10.1007/s40010-023-00855-7","url":null,"abstract":"<div><p>In this paper, we present the structural, optical, electrical and magnetic properties of the copper oxide nanoparticles prepared by co-precipitation method. The prepared copper oxide nanoparticles have been characterized by scanning electron microscopy, X-ray diffraction, X-ray electron spectroscopy and Fourier transform infrared spectroscopy. CuO nanoparticles exhibit spherical shape with the average particle size of around 42 nm. The X-ray diffraction pattern reaveals the crystalline monoclinic phase. The optical properties of the CuO nanoparticles studied by diffuse reflectance spectroscopy show the blue-shifted band gap of 1.45 eV. The electrical conductivity value of the sample has been measured using Keithley meter and it is 0.16 S/m. The magnetic properties measured using vibrating sample magnetometer at room temperature show a weak ferromagnetic behaviour with the dominant paramagnetic contribution of the CuO nanoparticles. The weak room temperature ferromagnetic behaviour may be associated with the oxygen vacancies and spin ordering induced by thermal energy and reduction in particle size.</p><h3>Graphic Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":744,"journal":{"name":"Proceedings of the National Academy of Sciences, India Section A: Physical Sciences","volume":"94 1","pages":"153 - 160"},"PeriodicalIF":0.8,"publicationDate":"2023-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138514981","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

Optimal Design of Two-Bit QCA Comparator Circuits 二位QCA比较器电路的优化设计

IF 0.8 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2023-11-17 DOI: 10.1007/s40010-023-00856-6

Reza Akbari-Hasanjani, Mohammad Amin Mianroodi, Reza Sabbaghi-Nadooshan

{"title":"Optimal Design of Two-Bit QCA Comparator Circuits","authors":"Reza Akbari-Hasanjani, Mohammad Amin Mianroodi, Reza Sabbaghi-Nadooshan","doi":"10.1007/s40010-023-00856-6","DOIUrl":"10.1007/s40010-023-00856-6","url":null,"abstract":"<div><p>The quantum-dot cellular automata (QCA) technology is one of the technologies for CMOS replacement which work based on columbic interacts. In this study, two two-bit comparator circuits are presented based on QCA and evaluated in terms of cell count, latency, and occupied area. Moreover, this study aims to reduce the occupied area, complexity, and energy dissipation of the comparator circuits, so the two comparator circuits have different power consumption levels. The proposed two-bit comparators are more compact and perform more consistently compared to previous designs. Design parameters of the two proposed circuits are optimized by reducing the cell count and occupied area compared to previous studies. The simulation results show that the proposed designs have a completely correct performance. In the first proposed two-bit comparator, 122 cells are used on an area of 0.14 µm<sup>2</sup> with a latency of 2.25 clock cycles. The second proposed two-bit comparator uses 107 cells on an area of 0.17 µm<sup>2</sup> with a latency of 1.75 clock cycles. Moreover, the values of energy dissipation of the proposed two-bit comparators at tunneling energies of 0.5, 1, and 1.5 E<sub>k</sub> are calculated. In the first proposed two-bit comparator, the average energy dissipation for tunneling energies of 0.5, 1, and 1.5 E<sub>k</sub> are calculated as 161.43, 222.83 and 296.52 meV, respectively. In the second proposed two-bit comparator, the average energy dissipation for tunneling energies of 0.5, 1, and 1.5 E<sub>k</sub> are calculated as 139.36, 192.92, and 257.06 meV, respectively.</p></div>","PeriodicalId":744,"journal":{"name":"Proceedings of the National Academy of Sciences, India Section A: Physical Sciences","volume":"94 1","pages":"27 - 36"},"PeriodicalIF":0.8,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138514982","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

Mitigation Strategies Using Nano-enabled Technologies for Sustainable Development Goals 利用纳米技术实现可持续发展目标的缓解战略

IF 0.8 4区综合性期刊

Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2023-11-09 DOI: 10.1007/s40010-023-00854-8

Debmalya Roy, Subhash Mandal, Kingsuk Mukhopadhyay

{"title":"Mitigation Strategies Using Nano-enabled Technologies for Sustainable Development Goals","authors":"Debmalya Roy, Subhash Mandal, Kingsuk Mukhopadhyay","doi":"10.1007/s40010-023-00854-8","DOIUrl":"10.1007/s40010-023-00854-8","url":null,"abstract":"<div><p>Hollow porous polymeric fibers have been fabricated to facilitate the adsorption of analyses on chemically modified synthetic membrane for rapid decontamination of contaminates. The pocket water filtration cartridge which could fit into plastic water bottle of standard nozzle size has been developed using polymeric membrane and electro spun nanofibers-based changeable pre-filters. During and several days after flooding, there is serious shortage of water to drink, cook, washing or cleaning as water become contaminated. The unique feature of our air droppable water filtration cartridges enables mass scale supply of drinkable water during natural calamities. This complete indigenous polymer nanofibers-based product has already successfully completed field trials at two major Indian government organizations for sustained supply of drinkable water. The hydration packs for long-range reconnaissance patrol have also been designed and developed with this portable filtration cartridges to supply the potable water during uninterrupted surveillances. Our clean and safe water solution has many added advantages compared to commercially available products in terms of higher filtration rate, easier operation and custom specific design to address the polluted water treatment challenges at much reduced cost.</p></div>","PeriodicalId":744,"journal":{"name":"Proceedings of the National Academy of Sciences, India Section A: Physical Sciences","volume":"94 1","pages":"143 - 151"},"PeriodicalIF":0.8,"publicationDate":"2023-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40010-023-00854-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135243592","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