Article
Mathematics
Rolando Quintero, Esteban Mendiola, Giovanni Guzman, Miguel Torres-Ruiz, Carlos Guzman Sanchez-Mejorada
Summary: Conceptual distance refers to the proximity between two concepts within a conceptualization, which is measured based on semantic similarity and relationships. DIS-C is a method that computes semantic similarity/relationships by propagating local distances using an All Pairs Shortest Path (APSP) algorithm. This paper explores different alternatives to improve DIS-C, focusing on reducing computational complexity for analyzing large graphs. The results indicate that a simplified version of DIS-C, based on centrality estimation, reduces processing time by 2.381 times compared to the original version.
Article
Construction & Building Technology
Yiwei Hua, Qing Chun, Xiaohu Jia
Summary: This study reviewed the characteristics of dou-gongs in early Chinese traditional timber buildings and proposed a new simplified beam-truss model based on refined finite element analysis. The results showed that the new model had acceptable computational accuracy compared to the refined model, with a significant reduction in calculation time consumption.
Article
Engineering, Electrical & Electronic
Qingzeng Yan, Zanrong Zhou, Mingbo Wu, Xibo Yuan, Rende Zhao, Hailiang Xu
Summary: A simplified analytical algorithm in abc coordinate based on the center-aligned 3L SVPWM was proposed to reduce the complexity of implementing 3L SVPWM. By unifying the adjustment of reference-voltage vectors and the calculation of modulation waves, the modulation waves can be analytically derived with only eight simple equations. Thus, the computation burden of simplified 3L SVPWM is significantly reduced.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Chemistry, Analytical
Lichen Yao, Guido Dolmans, Jac Romme
Summary: In this study, a low-complexity numerical method based on an analytical rectifier model is proposed to calculate the optimal load for different rectifier topologies without needing time-consuming simulations. The method has shown excellent accuracy in validation tests, indicating its effectiveness in maximizing rectifier efficiency.
Article
Multidisciplinary Sciences
Chuanjun Zhang, Ghulam Haidar, Murad Ul Islam Khan, Faisal Yousafzai, Kostaq Hila, Asad Ul Islam Khan
Summary: This article investigates the metric dimension and metric basis of a simple connected graph, and provides a method to determine them. It also explores the metric dimension of the join of two path graphs and develops algorithms to obtain metric dimensions and metric basis for such graphs.
Article
Chemistry, Physical
Selin Bac, Stephen Jon Quiton, Kareesa J. Kron, Jeongmin Chae, Urbashi Mitra, Shaama Mallikarjun Sharada
Summary: This work examines the viability of matrix completion methods as cost-effective alternatives to full nuclear Hessians for calculating quantum and variational effects in chemical reactions. The study finds that the harmonic variety-based matrix completion algorithm demonstrates robustness in chemical reactions and accurately recovers key observables.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Computer Science, Hardware & Architecture
Supriyo Maji, Cheng-Kok Koh
Summary: The concept of minimum cycle mean in a directed graph is widely used in circuit and system design. The YTO algorithm, implemented with a binary heap, is reported to be the fastest MCM algorithm, while the Karp algorithm can also be memory hungry. The early termination technique from the HO algorithm improves the runtime performance of Karp's algorithm and reduces its memory requirement.
IEEE TRANSACTIONS ON COMPUTER-AIDED DESIGN OF INTEGRATED CIRCUITS AND SYSTEMS
(2022)
Article
Materials Science, Multidisciplinary
Baocheng Guo, Rong Guo, Hengzai Hu, Jianping Shi, Chunmei Feng
Summary: This paper presents a simple and improved analytical model for linear permanent magnet synchronous machines (LPMSM) based on the correction factor. The proposed model, developed in Cartesian coordinate, simplifies the subdomains of LPMSM from 6 to 3 using curvature equations. The magnetic flux density and force analysis shows that the proposed approach aligns with finite element model. Additionally, the reduced calculation domains and harmonic orders make the proposed AM faster.
JOURNAL OF MAGNETICS
(2022)
Article
Engineering, Mechanical
Artem Andrianov
Summary: This paper introduces a simplified computational approach for the kinematic motions of a filament winding machine (FWM) manufacturing a bell-contoured rocket nozzle extension. Analytical equations are derived for the machine path to avoid the use of expensive commercial software for the automated control of the FWM. The final solution is obtained through the controllable degrees of freedom of a two or four-axis FWM, which is based on analytic geometry and consists of two stages. The feasibility of the proposed approach is successfully validated by manufacturing a small-scale bell-contoured nozzle extension.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2023)
Article
Mathematics
T. Mary Vithya, K. Murugan
Summary: This paper introduces the concept of open support independence number for sets and graphs, and studies the open support independence numbers of several specific graph structures under addition and multiplication.
ADVANCES AND APPLICATIONS IN MATHEMATICAL SCIENCES
(2022)
Article
Mathematics
T. mary Vithya, K. Murugan
Summary: This paper introduces the concept of closed support independence number for sets and graphs, and studies the calculation methods for various graphs such as paths, stars, complete graphs, etc.
ADVANCES AND APPLICATIONS IN MATHEMATICAL SCIENCES
(2022)
Proceedings Paper
Engineering, Biomedical
Thomas Buechler, Caroline Raether, Pascal Weber, Enno Ohlebusch
Summary: The pan-genome defines the space for genomic analyses, with graphs being the most natural representation. The Computational Pan-Genomics Consortium identified desirable properties for graphical frameworks, such as spatiality, monotonicity, and readability, and introduced a coordinate system for DAGs based on the level function and minimum path cover.
PROCEEDINGS OF THE 14TH INTERNATIONAL JOINT CONFERENCE ON BIOMEDICAL ENGINEERING SYSTEMS AND TECHNOLOGIES, VOL 3: BIOINFORMATICS
(2021)
Article
Chemistry, Multidisciplinary
Vinfcius N. Silveira, Nayara Caroline M. Carvalho, Jessica A. Oliveira, Lufs Antonio da Silva, Valeria A. Alves
Summary: This study used cyclic voltammetry to determine the concentration of vitamin C in long-life juices, and found significant differences between the measured concentration and the value provided by the manufacturer.
REVISTA VIRTUAL DE QUIMICA
(2022)
Article
Biochemical Research Methods
Juris Meija, Garnet McRae, Christopher O. Miles, Jeremy E. Melanson
Summary: This study quantitatively explored the degradation of cannabinoids in dried cannabis flower at different temperature environments. A network of first-order degradation reactions was found to model the changes in cannabinoids effectively. Unlike previous studies focusing on high-temperature effects, this study offers a precise assessment of room temperature kinetics with implications for shelf-life predictions and age estimates of cannabis products.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2022)
Article
Geochemistry & Geophysics
Ruoxi Zhang, Kenny Nadeau, Eduardo Amilcar Gautier, Paola Alejandra Babay, Jose Luis Ramella, Marian Virgolici, Andreea Elena Serban, Viorel Fugaru, Yoshiki Kimura, Celia Venchiarutti, Stephan Richter, Yetunde Aregbe, Zsolt Varga, Maria Wallenius, Klaus Mayer, Hana Seo, Jung Youn Choi, Csaba Tobi, Mostafa Fayek, Ryan Sharpe, Kyle M. Samperton, Victoria D. Genetti, Rachel E. Lindvall, Jeremy D. Inglis, Joanna S. Denton, Andrew A. Reinhard, Barbara Francisco, Xiaolei Zhao, William Kieser, Juan He, Ying Gao, Juris Meija, Ali El-Jaby, Lu Yang, Zoltan Mester
Summary: This study presents data from thirteen laboratories worldwide for the successful certification of uranium isotope ratios in uranium ore concentrate (UOC) certified reference materials. The study found significant variation in uranium isotope ratios among the three candidate UOC CRMs, with uncertainties of the proposed certified values superior to available reference materials.
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
(2022)
Article
Chemistry, Analytical
Enea Pagliano, Jaromir Vyhnanovsky, Stanislav Musil, Richard M. de Oliveira, Sandor T. Forczek, Ralph E. Sturgeon
Summary: The volatile synthetic products of photochemical vapor generation of Os(iv) and W(vi) have been confirmed by GC-MS. Osmium tetroxide and tungsten hexacarbonyl were identified as the species generated in different oxidizing and reducing media. However, the PVG products of Os and Ru generated in reducing media could not be determined using GC-MS and require other more direct methods for analysis.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2022)
Article
Chemistry, Analytical
Juris Meija, Antonio Possolo
Summary: In numerous articles and editorials published in ACQUAL, Paul De Bievre highlighted the challenges and opportunities of using statistical methods to enhance our understanding of chemical measurements. This memorial contribution revisits some of these concerns and proposes an optimistic outlook for the collaborative practice of statistical arts between chemists and statisticians.
ACCREDITATION AND QUALITY ASSURANCE
(2023)
Article
Chemistry, Analytical
J. S. F. Pereira, R. Alvarez-Fernandez Garcia, M. Corte-Rodriguez, A. Manteca, J. Bettmer, K. L. LeBlanc, Z. Mester, M. Montes-Bayon
Summary: This study used SELTM-1 as a certified reference material to compare the selenium concentrations in intra- and extracellular regions using different experimental procedures. The sequential procedure involving cell washing and freeze drying provided the most accurate results for quantifying the selenium content in both regions.
Article
Chemistry, Multidisciplinary
Jan Labuda, Jiri Barek, Zuzana Gajdosechova, Heidi Goenaga-Infante, Linda J. Johnston, Zoltan Mester, Sergei Shtykov
Summary: Analytical chemistry is essential for understanding the behavior of engineered nanomaterials (ENMs). Various techniques are used for isolation, identification, and quantification of nanomaterials in different samples. Physicochemical characterization of ENMs is also important for assessing their properties. This report provides an overview of ENMs, their properties, and analytical scenarios. It also evaluates the current status of nanomaterial identification and characterization for regulatory purposes and presents an overview of nanomaterial metrology and available reference materials.
PURE AND APPLIED CHEMISTRY
(2023)
Article
Chemistry, Analytical
Enea Pagliano, Elizabeth Keegan, Zsolt Varga, Kenny Nadeau, Juris Meija, Henri Wong, Christopher Vardanega, Maria Wallenius, Klaus Mayer, Chris Cochrane, Ali El-Jaby, Zoltan Mester
Summary: This study quantified the inorganic anions in three uranium ore concentrates, which is useful for nuclear forensics to establish sample provenance.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2023)
Article
Instruments & Instrumentation
Enea Pagliano, Juris Meija
Summary: In this study, it is demonstrated that the method of standard additions can lead to unreliable results in chemical analysis when the linear calibration model is forced to fit the data. Even with a well-designed standard addition experiment, results can still be biased by 10% when relying solely on the linear model. The Joint Committee for Guides in Metrology (GUM-6) has recently stressed the importance of addressing uncertainty in measurement models, and this study shows how model averaging can offer a practical solution to account for model uncertainty in the method of standard additions.
Article
Biochemical Research Methods
Elliott J. Wright, Juris Meija, Pearse McCarron, Christopher O. Miles
Summary: In this study, O-18-labelled AZA1, AZA2, and AZA3 were prepared by reacting with (H2O)-O-18 under acidic conditions. The reaction kinetics and sites of incorporation were analyzed using LC-HRMS/MS. The results showed that AZA1 and AZA3 had four exchangeable oxygen atoms. A stable isotopically labelled internal standard method was developed using O-18-labelled AZA1 and AZA3, which showed high accuracy and reproducibility in quantifying AZAs in shellfish matrices.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Analytical
Kelly L. LeBlanc, Gregoire Horndli, Marc-Antoine Bergeron, Zhigen Zhang, Patrick Denoncourt, Zoltan Mester
Summary: Selenized yeast is widely used as a source of selenium in dietary supplements and research due to its high bioavailability and formation of selenium-containing metabolites. Accurate quantitation of selenomethionine, the major form of selenium in selenized yeasts, is challenging and time-consuming. The National Research Council Canada has developed an 82-Se-enriched selenized yeast Certified Reference Material, SEEY-1, which can be used as a matrix-matched spike for the analysis of selenomethionine. SEEY-1 enables reliable analysis of Se amino acid content in under an hour compared to the conventional hydrolysis method.
ANALYTICAL CHEMISTRY
(2023)
Review
Instruments & Instrumentation
Juris Meija, Olha Bodnar, Antonio Possolo
Summary: Bayesian statistical methods are increasingly used in measurement science and offer unparalleled means to exploit all relevant and reliable measurement information. This review explores Bayesian concepts and methods in measurement science, providing practical examples of their application. The review also demonstrates that Bayesian methods are feasible using current modeling and computational techniques, and that measurement results obtained with Bayesian methods can be empirically validated.
Article
Chemistry, Analytical
Lu Yang, Brad Methven, Zoltan Mester, Juris Meija
Summary: Isotopic analysis by mass spectrometry relies on certified reference materials (CRMs) to correct instrumental isotopic fractionation. The currently recognized reference material for copper isotope ratio, SRM976, is no longer available. In this study, an independent isotope ratio measurement of a high-purity copper CRM, HICU-1, was reported and its isotopic composition was shown to be nearly identical to that of NIST SRM976.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2023)
Article
Biochemical Research Methods
Kelly L. LeBlanc, Tantima Kumlung, Andres Suarez Priede, Paramee Kumkrong, Thippaya Junvee, Suladda Deawtong, Jorg Bettmer, Maria Montes-Bayon, Zoltan Mester
Summary: Mushrooms are considered a valuable food source due to their high protein and fiber and low fat content. This study showed that selenium-enriched Lingzhi mushrooms contained low levels of selenium, with selenomethionine being the most abundant form. The mycelium of these mushrooms showed significant selenium accumulation and the presence of selenium nanoparticles, which could have potential medicinal value.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2023)
