Scientia Iranica最新文献_第5页

Sustainable thermochemical energy storage through eco-friendly zeolites - A characterization study 生态友好型沸石可持续热化学储能的表征研究

4区工程技术

Scientia Iranica Pub Date : 2023-09-03 DOI: 10.24200/sci.2023.59415.6231

Ankammarao Padamurthy, Jalaiah Nandanavanam, Parameshwaran Rajagopalan

{"title":"Sustainable thermochemical energy storage through eco-friendly zeolites - A characterization study","authors":"Ankammarao Padamurthy, Jalaiah Nandanavanam, Parameshwaran Rajagopalan","doi":"10.24200/sci.2023.59415.6231","DOIUrl":"https://doi.org/10.24200/sci.2023.59415.6231","url":null,"abstract":"Judicious utilization of natural resources always helps protect the environment from several ill-effects. This paper was aimed at exploring the merits of natural and environment friendly zeolites towards sustainable thermochemical energy storage. Sorption behaviour of selected zeolites were investigated using a differential thermogravimetric analyser. The desorption kinetics was studied by heating the materials from room temperature to 600 °C. The materials lose their water molecules on heating and become anhydrous mostly around 300 °C. The desorption enthalpies due to heating were noted to decrease with increase of heating rate, and found low for Zeolite-Mordenite (334.5 J g-1) and high for Molecular Sieves-4A (1060 J g-1). Materials’ adsorption enthalpies were determined by subjecting them to single cycle tests comprising of heating, cooling and hydration processes in sequence. The desorption and adsorption enthalpies of a single cycle were found to vary with the material and temperature program used. To understand the desorption and adsorption kinetics better, the materials were also tested on X-ray photoelectron spectroscopy, Brunauer–Emmet–Teller, and thermal constants analysers respectively for their elemental composition, structural properties, and thermal conductivity. This paper concludes that many of the naturally available zeolites stand as potential candidates for a sustainable thermochemical energy storage and recovery.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134948651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Functionally graded nanobeams subjected to large deflection by considering surface effects 考虑表面效应的功能梯度纳米梁的大挠度

4区工程技术

Scientia Iranica Pub Date : 2023-09-03 DOI: 10.24200/sci.2023.60997.7113

Yasser Taghipour, Moslem Zeinali

{"title":"Functionally graded nanobeams subjected to large deflection by considering surface effects","authors":"Yasser Taghipour, Moslem Zeinali","doi":"10.24200/sci.2023.60997.7113","DOIUrl":"https://doi.org/10.24200/sci.2023.60997.7113","url":null,"abstract":"In the current study, structurally graded nanobeams with distributed load are subjected to a large deflection analysis that takes surface effects into account. The nanobeams Young's elasticity modulus changes with thickness under a power-law function. The displacement elements are presented, generalization of the Young-Laplace formula is employed to account for the surface effects, and the total Lagrangian finite element formulation is utilized to get the outcomes by cracking the system of nonlinear differential equations founded on the Timoshenko beams theory. The reliability and correctness of the findings are confirmed by comparison with previously published publications. The investigation is done into how various characteristics, including length-to-thickness ratio, material gradient index, boundary conditions, and surface effects, affect the outcomes. The findings demonstrate that, in the presence of surface effects, residual surface tension plays a significant influence on the deflection of nanobeams. Additionally, a comparison of the power-law and exponential kinds of FG distribution is conducted in this study, and it is discovered that the FG materials with the power-law distribution are more applicable since they are less susceptible to surface effects than the exponential type.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134948649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Moving Average Control Charts using Uncertain Information for Various Sampling Schemes 使用不确定信息的各种抽样方案的移动平均控制图

4区工程技术

Scientia Iranica Pub Date : 2023-09-03 DOI: 10.24200/sci.2023.59210.6111

Muhammad Aslam, Srinivasa Rao Gadde, Nasrullah Khan

引用次数: 0

Development of an Appropriate Model for the Optional Lane-changing Rate in Weaving Segments with Short Lengths 短路段可选变道率模型的建立

4区工程技术

Scientia Iranica Pub Date : 2023-09-03 DOI: 10.24200/sci.2023.58865.5937

Ali Kashani, Behrooz Shirgir, Shervin Sayyar

{"title":"Development of an Appropriate Model for the Optional Lane-changing Rate in Weaving Segments with Short Lengths","authors":"Ali Kashani, Behrooz Shirgir, Shervin Sayyar","doi":"10.24200/sci.2023.58865.5937","DOIUrl":"https://doi.org/10.24200/sci.2023.58865.5937","url":null,"abstract":"In order to compute level of service and density in weaving segments, the Highway Capacity Manual (HCM) defined for the first time in 2010 a relationship based on a lane change rate to assess the density of the weaving segment. It is critical to accurately estimate lane changing rate in these situations, but field observations in weaving segments shorter than 250 meters in Tehran, Iran revealed a significant difference between the HCM2016 model estimate and field data. The traffic and geometric data collected at 87 (15-minute) intervals from six weaving segments in Tehran were used to develop models for estimating lane changing rate in weaving segments. These 87 intervals were then divided into 69 (terrain data) for equations and 18 (test data) for model comparisons. Weaving volume and weaving segment area are introduced as two independent variables in the optional lane changing rate model of weaving vehicles in this study, with R2=0.74. Furthermore, for a lane-changing model of non-weaving vehicles with R2=0.95, two new variables of non-weaving volume and traffic solidity were defined. Finally, based on the 18 intervals used to test the results, it showed the improvement of the developed models results compared to HCM2016 models.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134948646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On numerical solutions of Telegraph, viscous, and modified Burgers equations via Bernoulli collocation method 用伯努利配置法研究电报方程、粘性方程和修正Burgers方程的数值解

4区工程技术

Scientia Iranica Pub Date : 2023-09-03 DOI: 10.24200/sci.2023.60051.6569

Waleed Adel, Hadi Rezazadeh, Mustafa Inc

引用次数: 0

Exfoliated Poly (styrene-co-urethane) Grafted - Polymethylmethacrylate /Layered Double Hydroxide Nanocomposite Synthesized by Metal Catalyzed Living Radical Polymerization and Solvent Blending Method 金属催化活性自由基聚合和溶剂共混法制备剥离聚苯乙烯-聚氨酯接枝聚甲基丙烯酸甲酯/层状双氢氧化物纳米复合材料

4区工程技术

Scientia Iranica Pub Date : 2023-09-03 DOI: 10.24200/sci.2023.59942.6507

Mehdi Hosseinzadeh, Saber Ghasemi Karaj-Abad, Mehdi Rasizadeh, Mojtaba Abbasian

{"title":"Exfoliated Poly (styrene-co-urethane) Grafted - Polymethylmethacrylate /Layered Double Hydroxide Nanocomposite Synthesized by Metal Catalyzed Living Radical Polymerization and Solvent Blending Method","authors":"Mehdi Hosseinzadeh, Saber Ghasemi Karaj-Abad, Mehdi Rasizadeh, Mojtaba Abbasian","doi":"10.24200/sci.2023.59942.6507","DOIUrl":"https://doi.org/10.24200/sci.2023.59942.6507","url":null,"abstract":"In this research, a facile strategy was employed for the synthesis of terpolymer derivatives from polystyrene (PSt), polyurethane (PU), poly (methyl methacrylate) (PMMA), and its organo-modified Zn Al LDH (layered double hydroxide) by in situ ATRP. For this purpose, firstly, LDH nanoparticles were modified with sodium dodecyl sulfonate (SDS) by the anion exchange reaction of Zn-Al-LDH. Secondly, PU macroinitiator was obtained from a solvent composed of 9-decen-1-ol and used in controlled graft copolymerization of styrene to afford PU-co-Pst copolymer. Then, the synthesized PU-co-St was brominated by N-bromosuccinimide (NBS) to obtain a copolymer with the bromine group. In the following, living radical polymerization of MMA was done in the presence of brominated PU-co-St and CuBr /Bpy (2, 2’-bipyridine catalyst to prepare the (PMMA-g-PSt-g-PU) terpolymer. Finally, (PMMA-g-PSt-g-PU)/ ZnAl LDH nanocomposite was successfully synthesized by the solution intercalation method. FE-SEM images showed that surface morphologies of Zn-Al (SDS) and Zn-Al-LDH leads to sheet-like and hexagonal morphology. Investigation of thermal properties using DSC and TGA exhibited that the prepared (PMMA-g-PSt-g-PU) /Zn-Al-LDH nanocomposite has a higher thermal stability compared to neat PU. The synthesized terpolymer and (PMMA-g-PSt-g-PU)/ Zn-Al-LDH nanocomposite can be used as a reinforcing agent for polymeric nanocomposites due to its high LDH properties.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134948480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Diffraction by a Parallel-Plate Multiport Using the Method of Kobayashi Potentials 小林势法平行板多孔衍射

4区工程技术

Scientia Iranica Pub Date : 2023-08-30 DOI: 10.24200/sci.2023.62039.7613

Babak Honarbakhsh

引用次数: 0

Structural health monitoring of concrete arch dams using the wavelet transform and modal assurance criterion methods 基于小波变换和模态保证准则的混凝土拱坝结构健康监测

4区工程技术

Scientia Iranica Pub Date : 2023-08-30 DOI: 10.24200/sci.2023.60688.6938

Amir Meysam Giahi, Jafar Asgari Marnani, Mohammad Sadegh Rohanimanesh, Hassan Ahmadi

{"title":"Structural health monitoring of concrete arch dams using the wavelet transform and modal assurance criterion methods","authors":"Amir Meysam Giahi, Jafar Asgari Marnani, Mohammad Sadegh Rohanimanesh, Hassan Ahmadi","doi":"10.24200/sci.2023.60688.6938","DOIUrl":"https://doi.org/10.24200/sci.2023.60688.6938","url":null,"abstract":"Structural health monitoring of dams is a necessary issue in water supply network. Not identifying the local damages in these super structures and their extension could lead to abrupt and total collapse and impose major life or financial losses. This research investigates the effects of damage on the concrete arch dams and the methods for their detection. For this purpose the finite element model of a concrete arch dam was analyzed using the wavelet transform once by static frequency analysis and the second time when it is subjected to dynamic accelerograms. In the wavelet transform method using the static frequency analysis, cracks were formed on the dam body and the obtained results were compared to those obtained from Modal Assurance Criterion (MAC) method. In the wavelet transform method, by applying dynamic loads, different damage scenarios, including 16 damage locations and 3 damage levels (change in the materials properties) were compared to the healthy state of the dam. In order to process the wavelet transforms the displacements obtained from the modal and dynamic analyses were utilized. The results showed that employing wavelet transform method by applying dynamic loads could better detect the damages.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136241018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Two new numerical approaches for the fractional distribution of the model of a system of lakes via modified hat and quasi-hat functions 用修正帽函数和拟帽函数研究湖泊系统模型分数分布的两种新的数值方法

4区工程技术

Scientia Iranica Pub Date : 2023-08-30 DOI: 10.24200/sci.2023.60120.6606

Jafar Biazar, hamed Ebrahimi

引用次数: 0

Optimization-based Scheduling of Construction Projects with Generalized Precedence Relationships: A Real-Life Case Study 基于广义优先关系的建设项目优化调度:一个现实案例研究

4区工程技术

Scientia Iranica Pub Date : 2023-08-30 DOI: 10.24200/sci.2023.59493.6275

Saman Aminbakhsh, Ary Ahmed

{"title":"Optimization-based Scheduling of Construction Projects with Generalized Precedence Relationships: A Real-Life Case Study","authors":"Saman Aminbakhsh, Ary Ahmed","doi":"10.24200/sci.2023.59493.6275","DOIUrl":"https://doi.org/10.24200/sci.2023.59493.6275","url":null,"abstract":"Concomitant reduction of cost and duration is recognized as one of the main aspects of construction planning. Expedition of project schedule naturally incurs extra costs due to implementation of more productive and/or high-price construction techniques. Meanwhile, a reduction in time is usually plausible only down to a certain limit, below which renders expeditions either technically or financially unviable. Thus, striking a reasonable balance between project cost and duration remains a desirable yet challenging task for which there has been a myriad of advancements and literature. Despite the many studies associated with this problem – referred to as time-cost trade-off problem (TCTP) – it is observed that only a few exercise TCTPs with generalized logical relationships. This observation holds despite the fact that generalized precedence relationships are imperative to introduce parallelism and to secure a realistic overlap among the activities. In this regard, a Simulated Annealing-based Genetic Algorithm as proposed herein, is specifically designed to provide the capability of exerting TCTPs with properly overlapped activities. Efficiency of this algorithm is tested over a wide range of problems and its performance is validated over a large-scale real-case construction project. Results of the hybridized GA indicate fast and robust convergence to high-quality solutions.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136241016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0