Helge Kragh
Biographic Data
| ID | 1063174 |
|---|---|
| NAME | Helge Kragh |
| GIVEN NAMES | Helge |
| FAMILY NAME | Kragh |
| SIGNATURE | KRAGH H |
| AFFILIATIONS | Aarhus University |
| ORCID | 0000-0002-0748-3004 |
| VERIFIED | Yes |
| TOTAL WORKS | 39 |
| TOTAL CITATIONS | 9 |
| AUTHOR COUNT | 38 |
| EDITOR COUNT | 1 |
| FIRST PUBLICATION YEAR | 1980 |
| LATEST PUBLICATION YEAR | 2025 |
| H-INDEX | 2 |
S.P.L. Sørensen, the pH concept and its early history
Although the two-letter symbol pH is extremely common in chemistry and elsewhere, its origin and early dissemination has only received scant attention among chemists and historians of science. Introduced as a convenient symbol for ‘hydrogen ion exponent’ by the Danish biochemist S.P.L. Sørensen in 1909, after a decade or two pH won broad acceptance in the fields of physiology, biochemistry, medical research, and industrial chemistry in particular…
Antimatter in Near Space
Although antimatter—simple bodies made purely of antiparticles—is today predominantly a business of experimental particle physics, in the past astronomers discussed whether or not natural antimatter existed in the form of meteors, comets or even greater objects. They did not speak of antimatter, though, but typically of non-terrestrial or ‘contraterrene’ matter. The hypothesis of meteors made of antiparticles was first proposed in 1940 and subseq…
Cosmology and Controversy
The Oxford Handbook of the History of Modern Cosmology
Although some of the observational and conceptual roots of modern cosmology can be traced back to the nineteenth century, it was only in the twentieth century that the study of the universe as a whole emerged as a genuine physical science. The development through the twentieth and now well into the twenty-first century has been far from smooth, but in spite of a number of false trails it has been tremendously fruitful and surprisingly successful …
Oxford Handbook of the History of Modern Cosmology
Wilhelm Ostwald. The Autobiography
"Wilhelm Ostwald. The Autobiography." Ambix, 65(3), pp. 296–297
Philosophy of Physics
Testability and epistemic shifts in modern cosmology
The isotope effect
Continual Fascination
Argument Until the mid-nineteenth century the age-old idea of a cyclic or oscillating universe belonged to philosophical and religious discourse, with little connection to the physical and astronomical sciences. It was only with the emergence of thermodynamics, and even more so with the general theory of relativity, that it became possible to discuss the hypothesis within a scientific context. This paper follows the development of oscillating cos…
Michela Massimi Pauli's Exclusion Principle
Cosmologies with varying speed of light
Matter and Spirit in the Universe
Matter and spirit in the universe
Who Discovered the Expanding Universe
L'expansion de l'univers est reconnue comme un fait mais peut etre decrite comme une decouverte. L'A. analyse le concept de la decouverte scientifique, rappelle les principes d'Einstein qui l'ont conduit a la theorie de l'univers en expansion et decrit comment Hubble (E.) fut associe a la decouverte de l'univers en expansion
Edward Arthur Milne—The relations of mathematics to science
The genius of science
Before cosmophysics
Quantum Dialogue
Conceptual Changes in Chemistry
Heavy Water and the Wartime Race for Nuclear Energy . Per F. Dahl
Masters of Modern Physics
Arrhenius
TECHNOLOGY AND CULTURE Book Reviews 321 and coherent Fabric of Life remains at the 1991 level of discussion and responds neither to these important new contributions nor to the double development of her own thesis found in them. Christoph Lüthy Dr. LOthy, whose dissertation was titled “Matter and Microscopes in the Seven teenth Century” (Harvard, 1995), is working at the University of Nijmegen, the Netherlands. Arrhenius: From Ionic Theory to th…
Arrhenius
Conceptual Developments of Twentieth-Century Field Theories. Tian Yu Cao
The concept of the monopole. A historical and analytical case-study
Who Discovered the Expanding Universe
L'expansion de l'univers est reconnue comme un fait mais peut etre decrite comme une decouverte. L'A. analyse le concept de la decouverte scientifique, rappelle les principes d'Einstein qui l'ont conduit a la theorie de l'univers en expansion et decrit comment Hubble (E.) fut associe a la decouverte de l'univers en expansion
The Krarup Cable
Histoire de l'invention et de l'adoption du câble de Krarup, ligne electrique uniformement chargee permettant les transmissions telephoniques sur de longues distances et sous la mer
Julius Thomsen and classical thermochemistry
Classical thermochemistry is inextricably bound up with the problem of chemical affinity. In 1851, when Julius Thomsen began his career in thermochemistry, the concept of chemical affinity had been in the centre of chemical enquiry for more than a century. In spite of many suggestions, preferably to explain affinity in terms of electrical or gravitational forces, almost nothing was known about the cause and nature of affinity. In this state of pu…
Anatomy of a Priority Conflict
The concept of the monopole. A historical and analytical case-study
Julius Thomsen and classical thermochemistry
Classical thermochemistry is inextricably bound up with the problem of chemical affinity. In 1851, when Julius Thomsen began his career in thermochemistry, the concept of chemical affinity had been in the centre of chemical enquiry for more than a century. In spite of many suggestions, preferably to explain affinity in terms of electrical or gravitational forces, almost nothing was known about the cause and nature of affinity. In this state of pu…
The Beginning of the World
Schrödinger
Concept and Controversy
Lohn und Strafe in der Wissenschaft
David E. Nye's 'Electrifying America
From time atoms to space-time quantization
The Krarup Cable
Histoire de l'invention et de l'adoption du câble de Krarup, ligne electrique uniformement chargee permettant les transmissions telephoniques sur de longues distances et sous la mer
Matvei Petrovich Bronstein and Soviet Theoretical Physics in the Thirties . Gennady E. Gorelik , Victor Ya. Frenkel, Valentina M. Levina
Wissenschaftlicher Briefwechsel mit Bohr, Einstein, Heisenberg u.a. Volume 3
Libres propos sur l'histoire des sciences. Francois Russo
S. M. Jørgensen and his controversy with A. Werner
The controversy between Alfred Werner and Sophus Mads Jørgensen over the structure of complex inorganic compounds is not among the best known of the many controversies in the history of chemistry, but it is one of the most thoroughly described in the historical literature. This is due almost solely to the works of George Kauffman, the distinguished American historian of chemistry and specialist in the history of coordination chemistry. Kauffman h…
Arrhenius
TECHNOLOGY AND CULTURE Book Reviews 321 and coherent Fabric of Life remains at the 1991 level of discussion and responds neither to these important new contributions nor to the double development of her own thesis found in them. Christoph Lüthy Dr. LOthy, whose dissertation was titled “Matter and Microscopes in the Seven teenth Century” (Harvard, 1995), is working at the University of Nijmegen, the Netherlands. Arrhenius: From Ionic Theory to th…
Arrhenius
Conceptual Developments of Twentieth-Century Field Theories. Tian Yu Cao
Masters of Modern Physics
Conceptual Changes in Chemistry
Heavy Water and the Wartime Race for Nuclear Energy . Per F. Dahl
Quantum Dialogue
Edward Arthur Milne—The relations of mathematics to science
The genius of science
Before cosmophysics
Who Discovered the Expanding Universe
L'expansion de l'univers est reconnue comme un fait mais peut etre decrite comme une decouverte. L'A. analyse le concept de la decouverte scientifique, rappelle les principes d'Einstein qui l'ont conduit a la theorie de l'univers en expansion et decrit comment Hubble (E.) fut associe a la decouverte de l'univers en expansion
Philosophy (22 works) · Physics (20 works) · Epistemology (15 works) · History (12 works) · Computer Science (11 works) · Quantum mechanics (9 works) · Theoretical physics (9 works) · Astronomy (8 works) · Chemistry (7 works) · Cosmology (7 works)