共查询到20条相似文献,搜索用时 15 毫秒
1.
Klaus Ruthenberg 《Foundations of Chemistry》2009,11(2):79-91
Immanuel Kant has built up a dualistic epistemology that seems to fit to the peculiarities of chemistry quite well. Friedrich
Paneth used Kant’s concept and characterised simple and basic substances which refer to the empirical and to the transcendental
world, respectively. This paper takes account of the Kantian influences in Paneth’s philosophy of chemistry, and discusses
pertinent topics, like observables, atomism and realism.
相似文献
Klaus RuthenbergEmail: |
2.
Meredith Tromble 《Foundations of Chemistry》2009,11(1):51-60
This paper explores the use of chemical symbolism in works by the new media artist Sonya Rapoport, with a focus on the pivotal
Cobalt series from the late 1970s. These works, drawings on computer printouts generated by research at the Lawrence Berkeley Laboratory,
respond to experiments in nuclear chemistry. They mark the beginning of three productive decades in which Rapoport produced
a variety of images related to chemistry in her work. She states, “I looked for authentic research projects that were interesting
to me, preferably with captivating pictorial subject matter. Then came the creative chaotic process of resolving a cohesive
product that combined scientific research with art concept.” Rapoport had an unusual degree of access to scientific materials
through her husband, organic chemist Henry Rapoport, a faculty member at the University of California, Berkeley. At the time
of production, these works were outside mainstream art world interests and they have received little critical attention. This
paper examines the development of Rapoport’s images and places her use of chemical references in context in her lifetime of
work.
相似文献
Meredith TrombleEmail: |
3.
Vaporization enthalpies for the isomeric diazines were discussed within the context of recent measurements and estimation
techniques. It is suggested that pyridazine shows enigmatic behavior.
相似文献
Joel F. Liebman (Corresponding author)Email: |
4.
5.
Guy Yardeni Israel Zilbermann Eric Maimon Haim Cohen Dan Meyerstein 《Research on Chemical Intermediates》2009,35(4):543-554
A new CeIII complex was synthesized by mixing the ligand “dioxocyclam” with CeIII ions at pH 8.0 and its redox properties were investigated.
相似文献
Dan Meyerstein (Corresponding author)Email: |
6.
7.
Yan Gao Sabrina Reischmann Johannes Huber Tobias Hanke Rudolf Bratschitsch Alfred Leitenstorfer Stefan Mecking 《Colloid and polymer science》2008,286(11):1329-1334
Single semiconductor quantum dots were embedded into polymer particles with diameters below 0.1 μm by an emulsion polymerization
procedure or via a secondary dispersion approach. The photoluminescence properties of the nanocrystals are retained upon encapsulation,
as demonstrated by fluorescence confocal microscopy.
相似文献
Stefan MeckingEmail: |
8.
Hinne Hettema 《Foundations of Chemistry》2008,10(2):135-142
Michael Weisberg’s recent 2007 paper on the chemical bond makes the claim that the chemical notion of the covalent bond is
in trouble. This note casts doubts on that claim.
相似文献
Hinne HettemaEmail: |
9.
Michael Thompson 《Accreditation and quality assurance》2008,13(8):479-482
The currently recommended design of collaborative trials (interlaboratory method performance studies) is examined in relation
to the usefulness of the resulting statistics. It is suggested that larger experiments, without duplicate analysis, would
be more informative.
相似文献
Michael ThompsonEmail: |
10.
Vibronic interactions have received increasing attention in modern structural chemistry. Edward Teller played a pioneering
role in understanding and describing them during the “molecular physics” period of his scientific career. Very little is known
about the two scientists who contributed significantly to our knowledge about these effects and whose names have become associated
with Teller’s. This Editorial is devoted to Hermann Jahn and Rudolf Renner and attempts to lift them out of oblivion by paying
them tribute for their contributions.
相似文献
István Hargittai (Corresponding author)Email: |
11.
Saad Alshehri John Burgess Colin D. Hubbard Christopher J. Jones Amit K. Das 《Transition Metal Chemistry》2008,33(4):417-420
The kinetics of substitution by alcohols and by aniline at [tris(3,5-dimethylpyrazolyl)hydroborato]molybdenum nitrosyl dihalides in toluene solution at 298.2 K and at atmospheric pressure
are reported and interpreted in terms of an associative mechanism.
相似文献
Colin D. HubbardEmail: |
12.
Niki Baccile Anna Fischer Beatriz Julián-López David Grosso Clément Sanchez 《Journal of Sol-Gel Science and Technology》2008,47(2):119-123
Core-shell and homogeneous distributions of functionalized cerium oxide nanoparticles within spray-dried mesostructured silica
spheres are achieved by modification of synthesis parameters such as the templating agent and nanoparticle capping functions.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users.
相似文献
Clément Sanchez (Corresponding author)Email: |
13.
H. P. Zhang L. C. Yang L. J. Fu Q. Cao D. L. Sun Y. P. Wu R. Holze 《Journal of Solid State Electrochemistry》2009,13(10):1521-1527
Recent progress in studies of several types of core-shell structured electrode materials, including TiO2/C, Si/C, Si/SiO
x
, LiCoO2/C, and LiFePO4/C nanocomposites, including details of their preparation and their electrochemical performance is briefly reviewed. Results
clearly show that the coating shell can effectively prevent the aggregation of the nanosized cores, which are the electrochemically
active materials. In addition, the diffusion coefficients of lithium ions can be increased, and the reversibility of lithium
intercalation and deintercalation is improved. As a result, the cycling behavior is greatly improved. The reviewed results
suggest that core-shell nanocomposites are a good starting point for further development of new promising electrode materials.
相似文献
Y. P. WuEmail: |
R. Holze (Corresponding author)Email: |
14.
Davorka Moslavac Forjan Marijana Vinković Darko Kontrec Andreja Lesac Vladimir Vinković 《Structural chemistry》2007,18(5):585-591
Doubling of resonances in NMR spectra of chiral selectors with naphthyl group attached to the tertiary amide nitrogen atom
has been noticed what revealed the presence of two isomers. To test the enantiorecognition ability of these chiral selectors
they are covalently bonded to the HPLC silica gel. Those kind of chiral stationary phases were compared with analogous commercial
leucine chiral stationary phase. They exhibit the better enantioseparation results which indicate that the existence of cis/trans isomers does not have the negative influence on their enantioselective ability.
相似文献
Vladimir VinkovićEmail: |
15.
Structural formulas and explanation in organic chemistry 总被引:1,自引:1,他引:0
W. M. Goodwin 《Foundations of Chemistry》2008,10(2):117-127
Organic chemists have been able to develop a robust, theoretical understanding of the phenomena they study; however, the primary
theoretical devices employed in this field are not mathematical equations or laws, as is the case in most other physical sciences.
Instead it is diagrams, and in particular structural formulas and potential energy diagrams, that carry the explanatory weight
in the discipline. To understand how this is so, it is necessary to investigate both the nature of the diagrams employed in
organic chemistry and how these diagrams are used in the explanations of the discipline. I will begin this paper by characterizing
some of the major ways that structural formulas used in organic chemistry. Next I will present a model of the explanations
in organic chemistry and describe how both structural formulas and potential energy diagrams contribute to these explanations.
This will be followed by several examples that support my abstract account of the role of diagrams in the explanations of
organic chemistry. In particular, I will consider both the appeal to ‘hyperconjugation’ in the explanation of alkene stability
and how the idea of ‘ring strain’ was developed to explain the relative stability of cyclic compounds.
相似文献
W. M. GoodwinEmail: |
16.
Electrochemical studies of bi- and polymetallic complexes featuring acetylide based bridging ligands
Paul J. Low Rachel L. Roberts Richard L. Cordiner František Hartl 《Journal of Solid State Electrochemistry》2005,9(11):717-731
Acetylide-based bridging ligands have been widely used in the preparation of complexes that display a degree of electronic
interaction between metal-based redox groups located at the ligand termini. The electrochemical response of these systems
has been selectively reviewed, with a focus on the variation in properties that accompany changes in the structure of the
bridging ligand and the nature of the metal groups.
相似文献
Paul J. LowEmail: |
17.
N. Sukumar 《Foundations of Chemistry》2009,11(1):7-20
The concept of molecular structure is fundamental to the practice and understanding of chemistry, but the meaning of this
term has evolved and is still evolving. The Born–Oppenheimer separation of electronic and nuclear motions lies at the heart
of most modern quantum chemical models of molecular structure. While this separation introduces a great computational and
practical simplification, it is neither essential to the conceptual formulation of molecular structure nor universally valid.
Going beyond the Born–Oppenheimer approximation introduces new paradigms, bringing fresh insight into the chemistry of fluxional
molecules, proteins, superconductors and macroscopic dielectrics, thus opening up new avenues for exploration. But it requires
that our ideas of molecular structure need to evolve beyond simple ball-and-stick-type models.
相似文献
N. SukumarEmail: |
18.
René Dybkaer 《Accreditation and quality assurance》2007,12(12):661-663
Terminology within a small laboratory community can be informal without danger of misunderstanding, but communication with
a wider audience and not least in publications, needs unequivocal terms for defined concepts. As an example, the many meanings
of “concentration” are explored to present a systematic nomenclature, including a concept diagram.
相似文献
René Dybkaer |
19.
Micah Newman 《Foundations of Chemistry》2008,10(1):49-62
This paper surveys some ways in which the chemical realm can be described and outlined in terms of the concept of supervenience.
The particular contours of general chemical theory provide a ready basis for interpretation of determination, covariance,
and nonreduction—the characteristic metaphysical facets of the supervenience relation—in mutual terms. Building on this, the
extent to which chemically characterized properties and entities can be described in terms of a supervenience-scaffolded structure
represents a particularly vivid application that philosophers in general interested in supervenience would do well to attend
to. In addition, the model of chemical supervenience given here can be used as a rubric on which to decide on issues already
raised by philosophers of chemistry.
相似文献
Micah NewmanEmail: |
20.
Hitoshi Shirase Yurie Miura Yutaka Fukuda 《Monatshefte für Chemie / Chemical Monthly》2009,140(7):807-814
Abstract Mixed-ligand NiII complexes have been synthesized with 1,3-diketonate and bulky tri- or tetra-amine ligands. Their structures were determined
by X-ray crystallography, and solvatochromic behavior was examined by UV–vis–NIR spectroscopy. Steric effects of the bulky
ligands on the coordination distances and spectral properties are discussed.
Graphical Abstract
相似文献
Yutaka FukudaEmail: |