Iranian Journal of Science and Technology, Transactions A: Science最新文献_第8页

MH Loop and PE Loop Study for Ni Substitution in Perovskite Bismuth Ferrite 包晶铋铁氧体中镍替代的 MH 环路和 PE 环路研究

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-05-30 DOI: 10.1007/s40995-024-01581-4

Daniel Cliff Gonmei, Ibetombi Soibam

引用次数: 0

Influence of Biomass-derived Porous Activated Carbon on Polyaniline as Electrode Material for Supercapacitor Applications 生物质多孔活性炭对超级电容器应用电极材料聚苯胺的影响

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-05-29 DOI: 10.1007/s40995-024-01650-8

Murugan Vinayagam, Rajendran Suresh Babu, Arumugam Sivasamy, Ana Lucia Ferreira de Barros

{"title":"Influence of Biomass-derived Porous Activated Carbon on Polyaniline as Electrode Material for Supercapacitor Applications","authors":"Murugan Vinayagam, Rajendran Suresh Babu, Arumugam Sivasamy, Ana Lucia Ferreira de Barros","doi":"10.1007/s40995-024-01650-8","DOIUrl":"10.1007/s40995-024-01650-8","url":null,"abstract":"<div>The investigation focused on the impact of porous activated carbon derived from Sapindus trifoliatus biomass (STAC) in conjunction with a conducting polymer, polyaniline (PA), aimed at achieving high specific capacitance supercapacitors. To create the PA@STAC composites with different weight ratios of STAC (PA@STAC5, PA@STAC10, PA@STAC15, PA@STAC30, PA@STAC50), a practical in situ chemical oxidative polymerization method was employed. The observed improvements in specific capacitance and long-term stability of PA@STAC composites can be attributed to the synergistic effects of both PA and STAC. Consequently, the inclusion of STAC in the composite led to a more than twofold increase in capacitance compared to the original polymers. Specifically, the maximum specific capacitance for the PA@STAC30 composite was 224 F g−1 at a current density of 1 A g−1. The rapid GCD characteristic of PA@STAC30 is attributed to the good porosity and well-organized architecture morphology with short-ion diffusion that allow for free access during the GCD cycles. This study underscores the notable increase in capacitance potential and the enhanced durability of pseudocapacitors achieved through the straightforward addition of a conductive porous carbon material.</div>","PeriodicalId":600,"journal":{"name":"Iranian Journal of Science and Technology, Transactions A: Science","volume":"48 4","pages":"879 - 892"},"PeriodicalIF":1.4,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141167529","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

Biodiesel Production From High-free Fatty Acids Podocarpus falcatus Oil and Identification of Fatty Acid Methyl Esters by FT-IR, NMR (1H and 13C) and GC/MS Studies 通过傅立叶变换红外光谱（FT-IR）、核磁共振（1H 和 13C）和气相色谱/质谱研究，利用高游离脂肪酸荚果油生产生物柴油并鉴定脂肪酸甲酯

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-05-29 DOI: 10.1007/s40995-024-01649-1

Serges Bruno Lemoupi Ngomade, Aman Kumar Bhonsle, Neha Rawat, Hermann-Idriss Tiotsop Kuete, Achile Nana, George Ndifor-Angwafor Nche, Solomon Gabche Anagho, Neeraj Atray

{"title":"Biodiesel Production From High-free Fatty Acids Podocarpus falcatus Oil and Identification of Fatty Acid Methyl Esters by FT-IR, NMR (1H and 13C) and GC/MS Studies","authors":"Serges Bruno Lemoupi Ngomade, Aman Kumar Bhonsle, Neha Rawat, Hermann-Idriss Tiotsop Kuete, Achile Nana, George Ndifor-Angwafor Nche, Solomon Gabche Anagho, Neeraj Atray","doi":"10.1007/s40995-024-01649-1","DOIUrl":"10.1007/s40995-024-01649-1","url":null,"abstract":"<div>Biodiesel occupies a prominent place as the alternative fuel to fossil diesel owing to socio-economic and environmental factors. In this present study, Podocarpus falcatus oil (PFO), having undergone a storage effect, was converted into biodiesel. PFO had a high fatty acid content (FFA = 8.19%). For this reason, a two-step transesterification procedure was developed to convert these high-free fatty acid (FFA) oils into their corresponding monoesters. In the initial step, an acid-catalyzed esterification was employed to lower the FFA content of the oil to below 2%. Subsequently, a second step involving an alkaline catalysis transesterification process was used to convert the product obtained in the first step into monoesters and glycerol. The methyl esters obtained were analyzed using nuclear magnetic resonance (1H, 13C NMR), Fourier transform infrared spectroscopy (FT-IR), Thermal gravimetric analysis (TGA), carbon, hydrogen, nitrogen, and sulfur (CHNS), and Gas chromatography-mass spectrometry (GC–MS) analysis. The identity FAME were Hexadecanoic acid, methyl ester (C16:0), 9,11-Octadecadienoic acid, methyl ester, (E, E)- (C18:0), 6-Octadecenoic acid, methyl ester, (Z)- (C18:2), Methyl stearate (C18:1), Methyl (Z)-5,11,14,17-eicosatetraenoate (C20:5), 11,14-Eicosadienoic acid, methyl ester (C20:3), 11-Eicosenoic acid, methyl ester (C20:2). The study examined the thermal stability of synthesized biodiesel, revealing it remained stable up to 189 °C. Furthermore, the physicochemical properties of biodiesel were validated using ASTM6751 standards.</div>","PeriodicalId":600,"journal":{"name":"Iranian Journal of Science and Technology, Transactions A: Science","volume":"48 4","pages":"865 - 878"},"PeriodicalIF":1.4,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141196253","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

The Behavior of the Yukawa Potential in the Presence of a Natural Momentum Cutoff: An Analytical Study 自然动量截止时的尤卡娃势能行为：分析研究

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-05-25 DOI: 10.1007/s40995-024-01639-3

Masoudeh Tavakoli, Seyed Kamran Moayedi

{"title":"The Behavior of the Yukawa Potential in the Presence of a Natural Momentum Cutoff: An Analytical Study","authors":"Masoudeh Tavakoli, Seyed Kamran Moayedi","doi":"10.1007/s40995-024-01639-3","DOIUrl":"10.1007/s40995-024-01639-3","url":null,"abstract":"<div>In this paper the Proca field equations for a massive gauge particle are obtained in the presence of a natural momentum cutoff “(p_{max })” based on a covariant generalization of a one-parameter extension of the Heisenberg algebra. The Yukawa potential for a static point source in the presence of (p_{max }) (generalized Yukawa potential) is obtained analytically and it is shown that in contrast with the Yukawa potential for a static point source in Proca electrodynamics, the generalized Yukawa potential has a finite value at the location of the static point source. Our calculations demonstrate that the Coulomb potential, the Yukawa potential, and the Coulomb potential in the presence of (p_{max }) can be derived from the generalized Yukawa poitential. We show that the free space solutions of Proca electrodynamics in the presence of (p_{max }) describe a massive gauge particle with the effective mass (m_{eff} = frac{m}{{sqrt {1 - left( {frac{mc}{{p_{max } }}} right)^{2} } }}), where (m) is the rest mass of the ordinary Proca particle. Numerical estimations in Sect. 5, show that the lower bound for (p_{max }) must take the value (left( {p_{max } } right)_{min } = (91.187 pm 0.007),,frac{GeV}{c}) in order to avoid complex values for the effective mass (m_{eff}). This lower bound for (p_{max }) is near to the momentum scale of the electroweak interactions. It should be mentioned that for the very large values of (p_{max }) the results of this work reduce to the well-known results of standard Proca electrodynamics.</div>","PeriodicalId":600,"journal":{"name":"Iranian Journal of Science and Technology, Transactions A: Science","volume":"48 4","pages":"1053 - 1060"},"PeriodicalIF":1.4,"publicationDate":"2024-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141153509","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

A Hybrid Numerical Approach to Solve Multi-singular and Nonlinear Emden–Fowler Equations of Fourth Order: HQLMT 求解四阶多弦非线性埃姆登-福勒方程的混合数值方法：HQLMT

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-05-23 DOI: 10.1007/s40995-024-01636-6

Mohammad Izadi, Şuayip Yüzbaşı, Devendra Kumar

引用次数: 0

The Early Ontogeny of Some Pancreatic and Brush Border Enzymes in the Hatchery Produced Stellate Sturgeon, Acipenser stellatus 孵化生产的星鲟某些胰腺和刷状缘酵素的早期个体发育过程

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-05-20 DOI: 10.1007/s40995-024-01638-4

Amir Masoud Moradian, Fatemeh Paykan Heyrati, Farzaneh Noori, Yazdan Keivany, Salar Dorafshan

{"title":"The Early Ontogeny of Some Pancreatic and Brush Border Enzymes in the Hatchery Produced Stellate Sturgeon, Acipenser stellatus","authors":"Amir Masoud Moradian, Fatemeh Paykan Heyrati, Farzaneh Noori, Yazdan Keivany, Salar Dorafshan","doi":"10.1007/s40995-024-01638-4","DOIUrl":"10.1007/s40995-024-01638-4","url":null,"abstract":"<div>This study aimed to determine the level of some brush border and pancreatic digestive enzymes through different stages of feeding and food shifts from hatching to 540 degree days post-hatching (ddph) in Stellate sturgeon (Acipenser stellatus). The evaluated brush border enzymes are alkaline phosphatase, aminopeptidase N, and leucine alanine peptidase, and the pancreatic ones are α-amylase, and bile salt-activated lipase. The results revealed that all these either brush border or pancreatic were present at hatching. Intercellular brush border enzymes including alkaline phosphatase and aminopeptidase N reached their highest levels at 234 and 288 ddph (2.93 ± 0.12 and 3.64 ± 0.14 U mg protein−1 respectively) which were significantly different from hatching. Despite showing some fluctuations to the end, they remained high which can be suitable proof of the initiation of digestive activity in the intestine lumen. The highest specific activity of leucine alanine peptidase was observed at 234 ddph (0.15 ± 0.006 U mg protein−1)and then started to decrease significantly to the end which indicates the transformation of digestion into intercellular form. Pancreatic enzymes including α-amylase and bile salt-activated lipase were high at hatching (7.39 ± 2 and 7.26 ± 0.8 U mg protein−1) showing some fluctuations to the end. This high level at hatching can emphasize the necessity of the ability to consume the yolk sac composition right at hatching. The fluctuations at weaning stages can be due to the carbohydrate and lipid composition of diets.</div>","PeriodicalId":600,"journal":{"name":"Iranian Journal of Science and Technology, Transactions A: Science","volume":"48 4","pages":"855 - 864"},"PeriodicalIF":1.4,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141153517","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

Assessment of Natural Radioactivity in Phosphogypsum Generated in Senegal: A Radiological Investigation 塞内加尔产生的磷石膏中的天然放射性评估：放射学调查

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-05-20 DOI: 10.1007/s40995-024-01637-5

Niang Modou, Zobair El Afia, Fall El Hadji Mamadou, Mahmi Walid, Zefti Hanane, Fatimi Nezha, Niane Aliou, Boye Faye Ndeye Arame

{"title":"Assessment of Natural Radioactivity in Phosphogypsum Generated in Senegal: A Radiological Investigation","authors":"Niang Modou, Zobair El Afia, Fall El Hadji Mamadou, Mahmi Walid, Zefti Hanane, Fatimi Nezha, Niane Aliou, Boye Faye Ndeye Arame","doi":"10.1007/s40995-024-01637-5","DOIUrl":"10.1007/s40995-024-01637-5","url":null,"abstract":"<div>The concentrations of radioisotopes (238U, 234U, 235U, 210Po, 232Th, 40K, and 226Ra) in naturally occurring radionuclide materials were determined through gamma and alpha spectrometry. The average activities of 226Ra, 232Th, and 40K were matched with literature data from various countries. The radium equivalent value derived is 532.3 Bq kg−1, which exceeds the recommended limit of 370 Bq kg−1 for building materials without restrictions by 43.86%. The mean absorbed dose rate is 245.3 nGy h−1, significantly superior than 57 nGy h−1 reference value. The global annual effective dose, resulting from external radiation exposure and dust inhalation, is 0.3 mSv y−1, below the 1 mSv y−1 limit approved by the International Commission on Radiological Protection for public exposure.</div>","PeriodicalId":600,"journal":{"name":"Iranian Journal of Science and Technology, Transactions A: Science","volume":"48 4","pages":"893 - 900"},"PeriodicalIF":1.4,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141153498","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

Investigation and Optimization of a Pulsed Laser Radar Transmitter for Detection Performance in a Cloud Turbulent Medium 研究和优化脉冲激光雷达发射器在云湍流介质中的探测性能

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-05-20 DOI: 10.1007/s40995-024-01642-8

Zahra Bahmeh, Hamid Reza Zangeneh

{"title":"Investigation and Optimization of a Pulsed Laser Radar Transmitter for Detection Performance in a Cloud Turbulent Medium","authors":"Zahra Bahmeh, Hamid Reza Zangeneh","doi":"10.1007/s40995-024-01642-8","DOIUrl":"10.1007/s40995-024-01642-8","url":null,"abstract":"<div>The performance of pulsed laser radar systems in cloud media is severely affected by turbulence. These systems should then be able to identify targets in highly turbulent media. Here, the effects of turbulence on a laser beam reaching a target are investigated using ALTM software. The precise values of the beam parameters on the target (including the effective beam spot diameter, mean intensity, scintillation index, etc.) are also calculated for different states by changing the transmitter parameters (i.e., the divergence half-angle and power) and the separation distance between the target and the laser radar system. Accordingly, appropriate corrections can be applied to the laser radar system in order to efficiently perform in turbulent media such as cloud clutter. It is found that the transmitter beam divergence half-angle should be less than 500 μrad. Under this condition, it is possible to decrease the effective laser spot diameter and the scintillation index on the target, while also increasing the spatial coherence radius of the beam and the mean intensity. Alternatively, using PCModWin software, influences of absorption and scattering of cloud clutter on the beam intensity received by a target are simulated, followed by applying corrections to the intensity. As a result, the system performance can be improved for the desired detection distance in the presence of turbulence.</div>","PeriodicalId":600,"journal":{"name":"Iranian Journal of Science and Technology, Transactions A: Science","volume":"48 3","pages":"777 - 784"},"PeriodicalIF":1.4,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141153548","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

Variance Estimation in Spatially Balanced Sampling 空间均衡抽样中的方差估计

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-05-18 DOI: 10.1007/s40995-024-01617-9

Hossein Veisipour, Mohammad Moradi, Jennifer Brown

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Bessel Polynomials: Application in Finding Optimal Solution of Fractional COVID-19 Model Using Lagrange Multipliers 贝塞尔多项式：应用拉格朗日乘法器寻找分数 COVID-19 模型的最优解

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-05-16 DOI: 10.1007/s40995-024-01632-w

H. Saeidi, M. Sh. Dahaghin, S. Mehrabi, H. Hassani

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