Sādhanā Pub Date : 2024-06-27 DOI: 10.1007/s12046-024-02557-1

H M Shankara Murthy, Ramakrishna N Hegde, Niranjana Rai

{"title":"Effect on performance of a CTHE by using twisted tapes and Al2O3 nanofluids: an experimental study and correlation development","authors":"H M Shankara Murthy, Ramakrishna N Hegde, Niranjana Rai","doi":"10.1007/s12046-024-02557-1","DOIUrl":"https://doi.org/10.1007/s12046-024-02557-1","url":null,"abstract":"The current energy crisis is causing a transformation of tremendous scope and complexity. The natural gas, coal, and electricity sectors have experienced the largest tremors. In this regard, an effort was made to conserve energy by providing a compact heat exchanger that may be utilized to recover waste heat from power plants and industries. This article explores the effect of combined passive techniques on the performance of a CTHE fitted by twisted tapes at hot-side and Al2O3 nanofluid used as cold-side fluid. The experiments were conducted by incorporating the differently configured PVTTs and CFTTs (TR: 20, 13.3, and 9.8) in the inner tube with fixed flowrate (Re = 2500) of hot water and using different volume fractions of Al2O3 nanofluid (Vol.%: 0.05, 0.1 and 0.15) as cold fluid with varied flow rates (500 ≤ Re ≤ 5000) in the annulus. The results reveal that the PVTT (TR = 20) and 0.05% nanofluid combination increases the Nusselt number by 12.28% and the TPF by 1.127, while the CFTT (TR = 9.8) and 0.15% nanofluid combination increases the Nusselt number by 24.27% and the TPF by 1.263. Hence, CFTT (TR = 9.8) with 0.15% of Al2O3 nanofluid provided greater performance in the combinations tested, albeit at the expense of a little pressure loss.<h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3>\u0000","PeriodicalId":21498,"journal":{"name":"Sādhanā","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141529471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A model for fresh produce with inflation induced dynamic demand under dynamic trade credit policy in imprecise environments 不精确环境下动态贸易信贷政策下通货膨胀诱发动态需求的生鲜农产品模型

Sādhanā Pub Date : 2024-06-27 DOI: 10.1007/s12046-024-02530-y

Rituparna Mondal, Ranjan Kumar Jana

{"title":"A model for fresh produce with inflation induced dynamic demand under dynamic trade credit policy in imprecise environments","authors":"Rituparna Mondal, Ranjan Kumar Jana","doi":"10.1007/s12046-024-02530-y","DOIUrl":"https://doi.org/10.1007/s12046-024-02530-y","url":null,"abstract":"The significance of product freshness is heightened by the health-conscious market and the current circumstances. The quality of the product declines with time. In this case, the retailer implements a strategy of gradually reducing the selling price over time to mitigate the effects of product degradation. As a consequence, demand keeps growing over time. The demand for a product depends upon both its freshness and the price at which it is sold. In this research, a suggested retailer-customer supply chain for a fresh produce item is examined. The retailer implements a partial credit policy for the customer in order to increase the retailer’s order volume. The credit amount and credit period are found to be time-dependent in an increasing way. The optimal choice is determined by maximizing the total profit derived from the system. An optimization technique called particle swarm is developed, evaluated, and employed for the search process. According to the findings of this study, even if a merchant extends the credit term while a fresh product’s quality declines, overall profit will not improve since buyers would not jeopardize their health. A few examples are used to illustrate the concept.","PeriodicalId":21498,"journal":{"name":"Sādhanā","volume":"159 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141506728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance improvement of three-phase AFE rectifier during switching of loads with fractional feedback current control 利用分数反馈电流控制改善负载切换期间三相 AFE 整流器的性能

Sādhanā Pub Date : 2024-06-21 DOI: 10.1007/s12046-024-02539-3

Arkendu Mitra, Sayan Das, Sujoy Bhowmik, Sumana Chowdhuri

引用次数: 0

Reliability assessment and forecasting of moment ratio/factor of safety for sheet pile walls utilizing hybrid ANFIS enhanced by optimization techniques 利用优化技术增强的混合 ANFIS 对钢板桩墙的弯矩比/安全系数进行可靠性评估和预测

Sādhanā Pub Date : 2024-06-20 DOI: 10.1007/s12046-024-02547-3

Furquan Ahmad, Pijush Samui, K K Keshav

{"title":"Reliability assessment and forecasting of moment ratio/factor of safety for sheet pile walls utilizing hybrid ANFIS enhanced by optimization techniques","authors":"Furquan Ahmad, Pijush Samui, K K Keshav","doi":"10.1007/s12046-024-02547-3","DOIUrl":"https://doi.org/10.1007/s12046-024-02547-3","url":null,"abstract":"Addressing the inherent uncertainties in geotechnical engineering, particularly concerning natural materials, this study focuses on the crucial aspect of reliability analysis in geotechnical structures. The research delves into the Factor of Safety, specifically examining the Moment Ratio, for cantilever sheet pile walls in cohesionless soil. The study employs both the First-Order Reliability Method (FORM) and Second-Order Reliability Method (SORM), integrating various optimization techniques such as Genetic Algorithm, Particle Swarm Optimization, Firefly Algorithm, and Biogeography-Based Optimization. The research systematically evaluates the performance of a model, utilizing the widely-adopted Adaptive Neuro-Fuzzy Inference System (ANFIS) to predict pile moment ratios based on soil properties such as the angle of shearing resistance and unit weight. Rigorous criteria are applied to assess the model's efficacy, revealing the superior predictive capabilities of the hybrid ANFIS and Particle Swarm Optimization (ANFIS-PSO) model. This abstract encapsulates a comprehensive methodology for evaluating and quantifying risk in civil engineering projects related to cantilever sheet pile walls, providing valuable insights for the development and implementation of robust structures in the field.","PeriodicalId":21498,"journal":{"name":"Sādhanā","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141506731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Duck shaped load curve supervision using demand response program with LSTM based load forecast 利用基于 LSTM 负荷预测的需求响应程序进行鸭形负荷曲线监控

Sādhanā Pub Date : 2024-06-18 DOI: 10.1007/s12046-024-02532-w

Venkateswarlu Gundu, Sishaj P Simon

引用次数: 0

IRNSS/NavIC software receiver design with squared correlators code discriminator (SCCD) multipath mitigation method 采用平方相关器代码鉴别器（SCCD）多径缓解方法的 IRNSS/NavIC 软件接收器设计

Sādhanā Pub Date : 2024-06-18 DOI: 10.1007/s12046-024-02544-6

B Sathish Nayak, K Krishna Naik, Odelu Ojjela, Surendra Pal

{"title":"IRNSS/NavIC software receiver design with squared correlators code discriminator (SCCD) multipath mitigation method","authors":"B Sathish Nayak, K Krishna Naik, Odelu Ojjela, Surendra Pal","doi":"10.1007/s12046-024-02544-6","DOIUrl":"https://doi.org/10.1007/s12046-024-02544-6","url":null,"abstract":"IRNSS/NavIC is an independent navigation system developed by India. The dependence on external satellite-based navigation systems is gradually decreasing as a result of the deployment of our own navigation system, IRNSS/NavIC, which exhibits enhanced reliability. In this paper, a software-based IRNSS/NavIC receiver is developed using the standard Signal-In-Space Interface Control Document as a reference for signal structure, subframe patterns and parameter calculations. The IRNSS/NavIC receiver is validated with the I/Q data file as input which is generated by software based IRNSS/NavIC simulator. Analysis of the effect of a specific error on receiver output position necessitates repeated trials and modification, or in some cases, the development of new algorithms. The intermediate stage data can be viewed or stored as needed; a few examples are provided. In this paper Squared Correlators Code Discriminator (SCCD), a new multipath mitigation method has been designed and developed for IRNSS/NavIC receiver. The SCCD method is derived from Strobe Correlator (SC) and Combination of squared correlator method (CSC). The pseudorange bias is investigated and eliminated from the SCCD approach. The performance parameters of the IRNSS/NavIC receiver using each of the four approaches are compared, and the outcomes are discussed.","PeriodicalId":21498,"journal":{"name":"Sādhanā","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141506733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Developing a responsive medical logistics network during Covid‐19: a study on outbreak in India 在 Covid-19 期间发展反应迅速的医疗物流网络：对印度疫情的研究

Sādhanā Pub Date : 2024-06-13 DOI: 10.1007/s12046-024-02541-9

Mohd Juned, P. Sangle, Juvvala Rambabu

引用次数: 0

Likelihood corpus distribution: an efficient topic modelling scheme for Bengali document class identification 似然语料库分布：用于孟加拉语文档类别识别的高效主题建模方案

Sādhanā Pub Date : 2024-06-08 DOI: 10.1007/s12046-024-02470-7

Debapratim Das Dawn, Abhinandan Khan, S. Shaikh, R. K. Pal

引用次数: 0

Grid synchronised three phase VSI-based hardware emulator to realise low frequency electromechanical oscillations in power systems and their effects on physical distance relay 基于电网同步三相 VSI 的硬件仿真器，用于实现电力系统中的低频机电振荡及其对物理距离继电器的影响

Sādhanā Pub Date : 2024-06-07 DOI: 10.1007/s12046-024-02528-6

Jayanta Piri, Mainak Sengupta, Gautam Bandyopadhyay