Study Finds on MSN

Ancient Roman concrete could heal itself? New Pompeii evidence shows a key step scholars missed

Long dismissed as poor construction, ‘self-healing’ lime clasts have helped Ancient Roman structures persist for millennia. In A Nutshell Romans mixed quicklime directly with volcanic ash before ...
Frontiers

Revision Q-matrix in middle school chemistry: a structural equation modeling approach

The Q-matrix serves as a bridge that links items and attributes, and its accuracy affects the results of cognitive diagnosis. Inaccuracy of the Q-matrix are a common issue frequently encountered in ...
IEEE

Efficient Calculation of Propagation Coefficients in Anisotropic Media Through Transfer Matrix Method Based on Eigenvalue Analysis

Abstract: To explore the anisotropic nature and improve computational efficiency, eigenvalue (EV-) analysis is adopted to implement the transfer matrix method (TMM), abbreviated as EV-TMM, enabling ...
IEEE

A Symmetry-Based Multimodal Transfer-Matrix Method for the Analysis of 2D-Periodic Structures

Abstract: We propose a systematic and efficient extension of the multimodal transfer-matrix method to obtain the dispersion diagram of structures with 2-D periodicity specifically targeted to ...
Frontiers

Basic assumptions, core connotations, and path methods of model modification—using confirmatory factor analysis as an example

Structural equation modeling (SEM) is a widely used statistical method in social science. However, many published articles employing SEM appear to contradict its underlying principles and assumptions, ...
Scientific Research Publishing

Sensitivity Analysis of a Bridge Using the Kriging Method ()

1 School of Urban Construction, Yangtze University, Jingzhou, China. 2 Aeronautics Department, Nanchang Hangkong University, Nanchang, Jiangxi. This research investigates the problem of performing ...
eLife

Exploring protein structural ensembles: Integration of sparse experimental data from electron paramagnetic resonance spectroscopy with molecular modeling methods

Under physiological conditions, proteins continuously undergo structural fluctuations on different timescales. Some conformations are only sparsely populated, but still play a key role in protein ...
C&EN

Single-Crystal Structural Analysis of 2D Metal–Organic Frameworks and Covalent Organic Frameworks by Three-Dimensional Electron Diffraction

Creative Commons (CC): This is a Creative Commons license. Attribution (BY): Credit must be given to the creator. In the development of 2D metal–organic frameworks (MOFs) and 2D covalent organic ...