Results 91 to 100 of about 82,872 (272)
On Double-Entry Bookkeeping: The Mathematical Treatment [PDF]
arXiv, 2014 Double-entry bookkeeping (DEB) implicitly uses a specific mathematical construction, the group of differences using pairs of unsigned numbers ("T-accounts"). That construction was only formulated abstractly in mathematics in the 19th century--even though DEB had been used in the business world for over five centuries. Yet the connection between DEB and
arxiv
Restoration of human tooth enamel
BMEMat, EarlyView.Human tooth enamel has remarkable properties but lacks self‐repair ability. Existing restorative materials cannot fully replicate enamel's microstructure and function, resulting in low restorative efficiency. This review summarizes the formation process and characteristics of enamel, and current restorative materials and future research directions are ...
Hanlin Liu +10 more
wiley +1 more source
Solving Sangaku With Traditional Techniques [PDF]
arXiv, 2017 Between 17th and 19th centuries, mathematically orientated votive tablets appeared in Shinto shrines and Buddhist temples all over Japan. Known as sangaku, they contained problems of a largely geometrical nature. In the 17th century, the Japanese mathematician Seki Takakazu developed a form of algebra known as tenzan jutsu.
arxiv
Clinical Anatomy, Volume 38, Issue 3, Page 296-313, April 2025.Abstract A proper appreciation of cardiac development can now provide the necessary background to understand the anatomical findings in the congenitally malformed heart. We recently presented an account of human cardiac development based on reconstructions of histological datasets from human embryos aged between 3.5 and 8 weeks subsequent to conception.
Jill P. J. M. Hikspoors +5 more
wiley +1 more source
Newton's Hypotheses on the Structure of Matter [PDF]
arXiv, 2018 Isaac Newton's book 'Opticks' from the 18th century includes several hypotheses on the structure of matter. Most of the hypotheses were confirmed during the 19th and 20th centuries at the scale of atoms and molecules. Conflicts appear however with today's Standard Model of particle physics.
arxiv
Nonconventional Techniques in Plant Alkaloid Extraction: A Decade of Progress (2014–2023)
Chemistry &Biodiversity, EarlyView.This figure seeks to represent the evolution of the different unconventional approaches that were adopted for the extraction of plant‐derived alkaloids during the decade from 2014 to 2023. ABSTRACT Plant metabolism encompasses primary and secondary pathways, with secondary metabolism yielding diverse natural products crucial for plant adaptation and ...
Victor Menezes Sipoloni +5 more
wiley +1 more source
Creation, Chaos, Time : from Myth to Modern Cosmology [PDF]
Cosmology 2016 vol.24. 501-515, 2016 Every society has a story rooted in its most ancient traditions, of how the earth and sky originated. Most of these stories attribute the origin of all things to a Creator - whether God, Element or Idea. We first recall that in the Western world all discussions of the origin of the world were dominated until the 18th century by the story of Genesis ...
arxiv
Eugenia brasiliensis: Analysis of the Chemical Profile and Evaluation of Cytotoxic Potential
Chemistry &Biodiversity, EarlyView.Leaves of Eugenia brasiliensis were dried, crushed and macerated with polarity increment. The antiporliferative and anti‐migratory potential and the cell cycle were evaluated. 28 compounds were tentatively identified by mass sceptrometry. ABSTRACT This work evaluated the antiproliferative potential of Eugenia brasiliensis leaf extracts against the HeLa
Giovana G. F. V. de Oliveira +9 more
wiley +1 more source
Did Lobachevsky Have A Model Of His "imaginary Geometry"? [PDF]
arXiv, 2010 The invention of non-Euclidean geometries is often seen through the optics of Hilbertian formal axiomatic method developed later in the 19th century. However such an anachronistic approach fails to provide a sound reading of Lobachevsky's geometrical works.
arxiv
Practical assessment of masonry tunnel joint segmentation using topological machine learning
Civil Engineering Design, EarlyView.Abstract Condition assessment of masonry lined tunnels is time consuming and labor intensive. Recently developed digital workflows enable structural models to be created automatically, reducing analysis time. As part of these procedures, it is important to be able to identify the location of each masonry block.
Jack Smith, Chrysothemis Paraskevopoulou
wiley +1 more source