Article
Engineering, Chemical
Farzad Bazdidi-Tehrani, Mohammad Saleh Sargazizadeh
Summary: This paper presents the use of a parallel lattice Boltzmann solver for large eddy simulation of particulate matter flow in a single ventilated model room. The algorithm combines lattice Boltzmann method (LBM), large eddy simulation (LES), finite volume method (FVM), and Lagrangian particle tracking. The results show that the present LBM-LES method achieves acceptable accuracy and higher computational speed compared to FVM-LES based on Navier-Stokes equations and experimental data.
AEROSOL SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Chemical
George H. Downing, Yannis Hardalupas, Justice Archer, Henry E. Symons, Ulas Baran Baloglu, Daniel Schien, Bryan R. Bzdek, Jonathan P. Reid
Summary: This study compares computational simulations and measurements of aerosol dispersion in a ventilated classroom, finding that a newly developed aerosol transport model can accurately simulate dispersion and predict measured concentrations. The experiments highlight how the maximum aerosol concentration within a room can be many times higher than the average concentration, increasing the risk of infection.
AEROSOL SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Chemical
Ingo Sieber, David Zeltner, Martin Ungerer, Achim Wenka, Tim Walter, Ulrich Gengenbach
Summary: Aerosol jet printing is an emerging manufacturing technology for printed electronics, offering smaller feature sizes and more uniform thickness of printed layers compared to inkjet printing. The new integrated principle allows ink atomization directly inside the print head, enabling compact design, printing in all spatial directions, and on-demand operation.
AEROSOL SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Chemical
Emmanuel Adah, Aurelie Joubert, Rachid Boudhan, Marc Henry, Sylvain Durecu, Laurence Le Coq
Summary: Experimental campaigns were conducted to evaluate the performance of a pilot-scale spray scrubber in removing nanoparticles, with a reported efficiency of 45-62% for particles sized 12-90 nm. An existing PM collection model was adapted for extreme humidity and gas temperature conditions, showing good agreement with experimental results. Contrary to previous studies, interception was found to have a negligible contribution in collecting nanoparticles, while impaction dominated at smaller particle sizes.
AEROSOL SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Chemical
Taekyu Joo, Masayuki Takeuchi, Fobang Liu, Matthew P. Rivera, Joy Barr, Emily S. Blum, Eric Parker, John H. Tipton, Julia Varnedoe, Bahnisikha Dutta, Ryan P. Lively, Nga Lee Ng
Summary: This study evaluated the filtration efficiency of different materials and found that using multiple layers of masks can improve particle filtration efficiency. It is recommended to include materials with good filtration performance in homemade masks.
AEROSOL SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Chemical
Jason Stafford, Chen Xu
Summary: This study revealed the mechanisms by which PM2.5 particles enhance deposition on surfaces under turbulent axial fan flows, with impingement velocity and angle playing a dominant role. Contributions of turbulent events promoting particle deposition through turbulent diffusion and eddy impaction were uncovered using quadrant analysis, and local transport behavior of fine particles from bulk flow to the surface was categorized.
AEROSOL SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Chemical
Steven N. Rogak, Timothy A. Sipkens, Mark Guan, Hamed Nikookar, Daniela Vargas Figueroa, Jing Wang
Summary: This study evaluated the filtration efficiency and airflow resistance of different fabrics for mask construction, finding that some materials could provide high filtration (>90%) of 3 micron particles with low pressure drop, while others with visually good appearance had low filtration efficiency and high pressure drop. Despite the complexity of designing a very good mask, any mask will provide substantial protection to the wearer and those around them for larger aerosol particles.
AEROSOL SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Chemical
Frank Drewnick, Julia Pikmann, Friederike Fachinger, Lasse Moormann, Fiona Sprang, Stephan Borrmann
Summary: The COVID-19 pandemic has led to widespread use of face masks worldwide. Testing 44 samples of household materials and medical masks for filtration efficiencies and pressure drops across different particle sizes revealed significant variations between materials and particle sizes. Electrostatic attraction plays a strong role in overall filtration efficiency for particles up to 100 nm in diameter.
AEROSOL SCIENCE AND TECHNOLOGY
(2021)
Article
Mathematics, Applied
Rui Wang, Aiting Shen
Summary: This paper investigates the complete convergence and complete moment convergence of linear processes with random coefficients based on m-ANA random variables. It improves and generalizes some former results in the literature. As corollaries, the Marcinkiewicz-Zygmund type and the Kolmogorov type strong law of large numbers are also established for linear processes of m-ANA random variables with random coefficients.
JOURNAL OF MATHEMATICAL INEQUALITIES
(2022)
Editorial Material
Biochemistry & Molecular Biology
Ling Wang
Summary: In this issue of Molecular Cell, Ling Wang, the first author of the paper "Head-on and co-directional RNA polymerase collisions orchestrate bidirectional transcription termination," talks about her motivations for becoming a scientist, the challenges she faced during the pandemic, and her pedagogy as a new principal investigator.
Editorial Material
Optics
Siqiu Guo
Summary: My first encounter with Prof. Fan Wang had a lasting impact on me as I found him to be a gentle and well-read scholar, possessing exceptional talent. During our interactions, I could sense his passion for academia, his pursuit of knowledge, and his warm and kind personality. Prof. Fan Wang's profound and broad thinking, along with his dedication to cutting-edge research challenges, make him a leading young scientist in the fields of optoelectronics, biophotonics, and nanomaterials. His talent, knowledge, character, and sense of family responsibility command my admiration and respect. Let us now enter the world of Prof. Fan Wang and appreciate the brilliance of his extraordinary life.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Multidisciplinary Sciences
Robert Reynolds, Allan Stauffer
Summary: This article extends the Wang sum involving exponential sums of Lerch's Zeta functions to the finite sum of the Huwitz-Lerch Zeta function in order to derive sums and products involving cosine and tangent trigonometric functions. The general theorem used to derive these sums and products is in the form of a finite sum over positive integers of the Hurwitz-Lerch Zeta function, where the associated parameters are general complex numbers. New Hurwitz-Lerch Zeta function recurrence identities with consecutive neighbors are derived, and some examples of finite sum and product formulas involving cosine, tangent, and the product of cosine and tangent functions are also derived and evaluated.
Article
Chemistry, Physical
Robert F. Bull, Alfred C. K. Farris, David P. Landau
Summary: In this study, we investigated the thermodynamic and structural properties of synthetic multiblock copolymers using Wang-Landau sampling on a simple cubic lattice. We compared different sequences and observed differences in the collapse process, as well as studied structural transitions below the coil-to-globule transition temperature in the lattice. Additionally, we examined the relationship between block length, number of blocks, and overall polymer length with respect to these structural transitions, and observed how the formation and shape of a ground state core affected structural changes as temperature increased.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Stefan Schnabel, Wolfhard Janke
Summary: This paper demonstrates how the well-known Wang-Landau method can be modified to produce non-flat distributions, leading to increased efficiency for certain systems. Examples of such enhancements are provided.
COMPUTER PHYSICS COMMUNICATIONS
(2021)
Article
Computer Science, Software Engineering
Xiaokang Liu, Chenran Li, Lin Lu, Oliver Deussen, Changhe Tu
Summary: Wang tiles, a popular tool in procedural synthesis, are a jigsaw puzzle system with matching edges. This paper proposes a generation method for multi-scale Wang tiles that aims to minimize the amount of needed tiles while maintaining a tiling appearance similar to low-level tiles. The method can be used for rapid texture synthesis and image halftoning.
COMPUTER GRAPHICS FORUM
(2022)