Iranian Journal of Science and Technology, Transactions A: Science最新文献_第2页

A New Modified Orthogonal Saban Frame on (S^{2}_{1}) and (H^{2}_{0}) and the Evolution of Curves (S^{2}_{1})和(H^{2}_{0})上一种新的修正正交Saban框架及其曲线演化

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2025-01-08 DOI: 10.1007/s40995-024-01767-w

Alperen Kızılay, Atakan Tuğkan Yakut

引用次数: 0

A Hybrid Scheme for Efficient Numerical Solution of the Fractional Telegraph Equation 分数阶电报方程有效数值解的混合格式

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-12-31 DOI: 10.1007/s40995-024-01762-1

Atallah El-shenawy, Mohamed El-Gamel, Amir Teba

引用次数: 0

Approximation of Stochastic Advection–Diffusion Equations with Predictor-Corrector Methods 用预测校正方法逼近随机平流扩散方程

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-12-30 DOI: 10.1007/s40995-024-01752-3

Fatemeh Nassajian Mojarrad, Ali R. Soheili

引用次数: 0

Lucas Operational Matrix Approach for Solving the Fractional Klein–Gordon Equation 求解分数阶Klein-Gordon方程的Lucas操作矩阵法

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-12-28 DOI: 10.1007/s40995-024-01744-3

A. A. Khajehnasiri, M. Afshar Kermani, T. Allahviranloo

引用次数: 0

Modification of Bitumen Properties Using Polyethylene Glycol: Towards Improved Outer Wrap Tapes for Gas Pipeline Coating in Cold Regions 聚乙二醇改性沥青性能——改进寒冷地区输气管道涂层外包带的研究

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-12-27 DOI: 10.1007/s40995-024-01759-w

Milad Asadnia, Mehdi Sadat-Shojai

{"title":"Modification of Bitumen Properties Using Polyethylene Glycol: Towards Improved Outer Wrap Tapes for Gas Pipeline Coating in Cold Regions","authors":"Milad Asadnia, Mehdi Sadat-Shojai","doi":"10.1007/s40995-024-01759-w","DOIUrl":"10.1007/s40995-024-01759-w","url":null,"abstract":"<div><p>Coating gas pipelines is a crucial practice in the gas industry to enhance pipeline integrity, longevity, and safety. Recently, the outer wrap tape of bitumen impregnated glass fiber have been developed as the part of protective layers for the underground pipelines. Outer tapes prepared of pre-modified 10/20-grade bitumen by styrene–ethylene/butylene–styrene (SEBS), styrene–butadiene–styrene (SBS), and talk powder suffer from some problems such as brittleness at low temperatures, inadequate adhesion between the two glass fiber layers, and high weight. Therefore, the aim of this study was to survey the physical, rheological, and adhesion characteristics of pre-modified bitumen after addition of polyethylene glycol (PEG) 2000 and then to investigate the quality of the tape produced with this bitumen. Improvement of flexibility and decrease of susceptibility to deformation at low temperatures of PEG-modified samples were confirmed by penetration, softening point, and penetration index (PI) tests. The storage stability investigation showed that at higher PEG concentrations phase separation may happen. Dynamic shear rheological (DSR) test indicated that PEG-modified samples have lower complex modulus and complex viscosity. Tapes produced with PEG-modified bitumen displayed less brittleness and enhanced adhesion than those produced with unmodified bitumen. Generally, this study highlights the potential of PEG as a promising additive to prepare bitumen with desired properties. These findings contribute to the development of gas pipe coating technology in cold regions, specifically the production of outer wrap tapes.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":600,"journal":{"name":"Iranian Journal of Science and Technology, Transactions A: Science","volume":"49 3","pages":"645 - 654"},"PeriodicalIF":1.4,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938728","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

Extraction of Zemu Glacier’s Boundary Using a Multi-Parametric Approach 基于多参数方法的泽木冰川边界提取

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-12-24 DOI: 10.1007/s40995-024-01769-8

Devishri Kangjam, Kamaljit Singh Rajkumar, Mamata Maisnam, Pallipad Jayaprasad, Maganti Srinivasa Tarun, Putrevu Deepak, Misra Arundhati, Sharma Narpati, Shrestha Dhiren

{"title":"Extraction of Zemu Glacier’s Boundary Using a Multi-Parametric Approach","authors":"Devishri Kangjam, Kamaljit Singh Rajkumar, Mamata Maisnam, Pallipad Jayaprasad, Maganti Srinivasa Tarun, Putrevu Deepak, Misra Arundhati, Sharma Narpati, Shrestha Dhiren","doi":"10.1007/s40995-024-01769-8","DOIUrl":"10.1007/s40995-024-01769-8","url":null,"abstract":"<div><p>Though Zemu is the largest glacier in the Eastern Himalayas, it is one of the least monitored among the Himalayan glaciers. Thus, its sensitivity to global climate change should not be neglected. Glacier boundary delineation is a labor-intensive and time-consuming process. Therefore, the primary objective of this study is to create a semi-automatic processing chain that can recognize glacier boundaries using Synthetic Aperture Radar (SAR) data, Principal Component Analysis (PCA), and Connected components segmentation (CCS) techniques. SAR data processing provides weather-independent, high-resolution data that captures the surface characteristics of the glacier, including backscatter intensity and coherence, which are crucial for detecting glacier boundaries. PCA reduces data redundancy and enhances the spatial characteristics of the input data. CCS groups pixels with similar intensities into segments. Combining these methods results in a more accurate and reliable delineation of glacier boundaries. The parameters we have selected for the process are unique. Earlier researchers have used coherence and slope information. However, we have also considered the effect of radar backscattering intensity and curvature of the study area in addition to coherence and slope information. The use of CCS gives uniqueness to this study. A qualitative analysis of the study showed similarity with the GLIMS glacier outline, and the Intersection over Union (IoU) metric for segmentation accuracy was 0.67. Additionally, the two-pass Differential SAR Interferometry (DInSAR) technique was used for estimating the LOS velocity of the Zemu glacier. The significance is that LOS velocity measurements help track the movement of glaciers over time.</p></div>","PeriodicalId":600,"journal":{"name":"Iranian Journal of Science and Technology, Transactions A: Science","volume":"49 3","pages":"681 - 695"},"PeriodicalIF":1.4,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938676","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 approximation properties of Riemann-Liouville type fractional Bernstein-Stancu-Kantorovich operators with order of (alpha) 黎曼-利乌维尔分式伯恩斯坦-斯坦库-康托洛维奇算子的一些近似性质

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-12-24 DOI: 10.1007/s40995-024-01754-1

Reşat Aslan

引用次数: 0

Synthesis and Characterization of Microporous Nanomaterial from ZIF-8 for Efficient Loading and Controlled Release of Dapsone in Aqueous Media ZIF-8微孔纳米材料的合成及其在水介质中高效负载和控释氨苯砜的表征

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-12-21 DOI: 10.1007/s40995-024-01750-5

Zahra Khalili, Negar Moatakef Kazemi, Zahra Jafari Azar, Zahra Mosavi, Mehdi Hasanzadeh

{"title":"Synthesis and Characterization of Microporous Nanomaterial from ZIF-8 for Efficient Loading and Controlled Release of Dapsone in Aqueous Media","authors":"Zahra Khalili, Negar Moatakef Kazemi, Zahra Jafari Azar, Zahra Mosavi, Mehdi Hasanzadeh","doi":"10.1007/s40995-024-01750-5","DOIUrl":"10.1007/s40995-024-01750-5","url":null,"abstract":"<div><p>This study focuses on the synthesis, characterization, and application of a microporous nanomaterial made from a metal-organic framework called ZIF-8. The material was successfully prepared and used to investigate its ability to load and release dapsone in water-based solutions. This prepared ZIF-8 exhibited promising drug loading from aqueous environments through hydrogen bonding, π-π, and electrostatic interactions. The synthesized ZIF-8 was characterized through Fourier transform infrared spectroscopy, X-ray diffraction, field emission scanning electron microscopy, Elemental mapping analysis, thermogravimetric analysis, and Brunauer–Emmett–Teller analysis to investigate its structure and morphology. The study investigated several factors that could influence the dapsone loading procedure, including pH, ZIF-8 dosage, and loading time, to optimize the process. Using the non-linear simplex optimization methodology, it was found that the efficiency of loading dapsone exceeded 92.5 ± 3.9% when the concentration of the dapsone drug was 50 mg.L<sup>-1</sup>. The most effective parameters for achieving the highest possible loading of dapsone were loading pH = 7.0, ZIF-8 dosage = 6.0 mg.mL<sup>-1</sup>, and loading time = 120 min. Investigative studies on release mechanisms demonstrated that when the dapsone-loaded ZIF-8 was submerged in phosphate buffer saline (at pH = 7.4 and temperature = 37 °C), it displayed an optimal efficiency surpassing 80% following a duration of 120 h.</p></div>","PeriodicalId":600,"journal":{"name":"Iranian Journal of Science and Technology, Transactions A: Science","volume":"49 2","pages":"331 - 344"},"PeriodicalIF":1.4,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143583573","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

Transformation, Kinetic and Thermodynamic Behaviors of Ni4Ti3 Precipitated/Un-Precipitated Ni-Rich NiTi SMA Ni4Ti3沉淀/未沉淀富ni - NiTi SMA的相变、动力学和热力学行为

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-12-21 DOI: 10.1007/s40995-024-01756-z

Boutheina Ben Fraj, Slim Zghal

{"title":"Transformation, Kinetic and Thermodynamic Behaviors of Ni4Ti3 Precipitated/Un-Precipitated Ni-Rich NiTi SMA","authors":"Boutheina Ben Fraj, Slim Zghal","doi":"10.1007/s40995-024-01756-z","DOIUrl":"10.1007/s40995-024-01756-z","url":null,"abstract":"<div><p>In this study, it is aimed to experimentally investigate the transformation and the thermodynamic behaviors of the Ni-rich NiTi Shape Memory Alloy (SMA) at various thermal conditions. Based on XRD and SEM analyses, Ni<sub>4</sub>Ti<sub>3</sub> precipitated/un-precipitated structures were identified as function of annealing temperature (450 °C and 650 °C). Through the calorimetric study, by varying the DSC scanning rate, it was proved that transformation temperatures, transformation rate and thermal hysteresis are highly sensitive to the presence of the precipitation phase. Furthermore, thermodynamic properties and kinetic behavior were assessed highlighting the impact of microstructural alteration on changes in enthalpy, entropy, Gibbs free energy and elastic energy. Activation energies of Ni<sub>4</sub>Ti<sub>3</sub> precipitated and un-precipitated samples were determined according to Kissinger and Takhor approaches revealing a notable negative activation energy for the un-precipitated sample and considerably high values for the precipitated one. This result implies that, with the presence of Ni<sub>4</sub>Ti<sub>3</sub> precipitates, the NiTi SMA requires higher activation energy to conduct the martensitic transformation.</p></div>","PeriodicalId":600,"journal":{"name":"Iranian Journal of Science and Technology, Transactions A: Science","volume":"49 2","pages":"547 - 558"},"PeriodicalIF":1.4,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143583666","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

Complex Symmetry of Slant H-Toeplitz Operators 斜H-Toeplitz算子的复对称性

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-12-11 DOI: 10.1007/s40995-024-01745-2

Anuradha Gupta, Deepika Singh

引用次数: 0