Complexes of cobalt(II) halides with 4-methylpyridine and 2-methylpyridine

1965 ◽  
Vol 18 (4) ◽  
pp. 507 ◽  
Author(s):  
DP Graddon ◽  
EC Watton
Keyword(s):  
Magnetic Properties ◽  
Infrared Spectra ◽  
Visible Region ◽  
The Other ◽  
Free Base ◽  
Electron Pairs ◽  
Relative Stabilities ◽  
The One ◽  
Spectrochemical Series ◽  
Bonding Electron

Complexes of CoCl2, CoBr2, CoI2, and Co(NCS)2 with two and four molecules of 4-methylpyridine and two molecules of 2-methylpyridine have been prepared. Their magnetic properties, conductivities, and reflectance and absorption spectra in the visible region show that all the compounds of the type CoX2B2 are tetrahedral except Co(NCS)2(4-mepy)2, which is an octahedral polymer like its pyridine analogue. Infrared spectra in the 3-15 μ region lend no support to the suggestion that there may be differences in the extent of π-bonding between the metal and the base or the metal and NCS- in tetrahedral and octahedral complexes. It is suggested that the position of the ligands in the spectrochemical series and the relative stabilities of the compounds CoX2B2 with respect to dissociation into CoX2B4 and free base can be explained in terms of repulsion effects between the non-bonding electron pairs on the ligands and metal dє-orbitals on the one hand and the non-bonding electron pairs of neighbouring ligands on the other.

II. On the spectrum of the oxyhydrogen flame

1888 ◽  
Vol 43 (258-265) ◽  
pp. 347-348
Keyword(s):  
Visible Region ◽  
Ultra Violet ◽  
The Other ◽  
The One ◽  
Oxyhydrogen Flame

In a former communication the authors described simultaneously with Dr. Huggins the strongest portion of the spectrum of water, subsequently they described a second less strong but more refrangible section of the same spectrum. M. Deslandres has noticed a third still more refrangible section. The authors now find that the spectrum extends, with diminishing intensity, into the visible region on the one hand, and far into the ultra-violet on the other.

Sciences Activities in Preschool Age: The case of elementary magnetic properties

2014 ◽  
Vol 1 (1) ◽  
pp. 1-6
Author(s):  
Dimitri Nertivich
Keyword(s):  
Magnetic Properties ◽  
Small Groups ◽  
School Children ◽  
Preschool Age ◽  
The Other ◽  
Attractive Force ◽  
Metallic Materials ◽  
Different Types ◽  
The One

This article present the results of a research relating to the construction of elementary magnetic properties in pre-school children. Five to six year old children, in small groups, had at their disposal different types of magnets as well as diverse objects which could be attracted by them. The proposed hypothesis is that by performing various activities (playing) with them, the children on the one hand would discover the attractive force exerted on certain metallic materials and on the other would distinguish the objects which were not thus attracted. We also formed the hypothesis that the children would discover the mutual forces of interaction by using the magnets. The teachers observed the activities, encouraged and questioned each child and intervened in order to help the children to co-ordinate their activities which were becoming more and more complex. The analysis of the protocols gave us results which seem to confirm the hypotheses.

Electron detachment from anions in aqueous solutions studied by two- and three-pulse femtosecond spectroscopy

2010 ◽  
Vol 82 (10) ◽  
pp. 1919-1926 ◽  
Author(s):  
Hristo Iglev ◽  
Martin K. Fischer ◽  
Alfred Laubereau
Keyword(s):  
Diffusion Coefficients ◽  
Strong Influence ◽  
Electron Pair ◽  
Hydrated Electron ◽  
The Other ◽  
Electron Detachment ◽  
Electron Pairs ◽  
Electron Photodetachment ◽  
Relaxation Channel ◽  
The One

The electron photodetachment of the aqueous halides and hydroxide is studied after resonant excitation in the lowest charge-transfer-to-solvent (CTTS) state. The initially excited state is followed by an intermediate assigned to a donor-electron pair that displays a competition of recombination and separation. Using pump–repump–probe (PREP) spectroscopy, the pair species is verified via a secondary excitation with separation of the pairs so that the yield of released electrons is increased. The observed recombination process on the one hand and the similar absorptions of the intermediate and the hydrated electron on the other hand suggest that the donor-electron pairs incorporate only few if not just one water molecule. The geminate dynamics measured in the various CTTS systems reveal a strong influence of the parent radical. The electron survival probability decreases significantly from 0.77 to 0.29 going from F– to OH–. The extracted dissociation rates of the halogen-electron pairs seem to be proportional to the mutual diffusion coefficients of the geminate particles, while such a relation between the recombination rate and the diffusion coefficient is not found. Results for I– show that excitation of a higher-lying CTTS state opens a new relaxation channel, which directly leads to a fully hydrated electron, while the relaxation channel discussed above is not significantly affected.

Magnetic Properties of Polar ZnO Surfaces from Ab-initio Calculations

2011 ◽  
Vol 1370 ◽  
Author(s):  
Guntram Fischer ◽  
Nadiezhda Sanchez ◽  
Waheed A. Adeagbo ◽  
Martin Lüders ◽  
Zdzislawa Szotek ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Oxygen Atom ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Magnetic Moment ◽  
Magnetic Force ◽  
Interaction Mechanism ◽  
The Other ◽  
The One ◽  
Exchange Parameters

ABSTRACTWe have studied the effect that applying self-interaction correction (SIC) to oxygen p orbitals has on the magnetic moment formation of three polar ZnO surfaces; all of them being oxygen terminated. For these investigations we have used a multi-code approach. This has allowed us, on the one hand, to relax the surface structure using the pseudopotential code SIESTA. On the other hand, by using the obtained relaxed structures for calculations within the KKR Green’s function formalism, we have been able to apply SIC and use the magnetic force theorem for calculating Heisenberg exchange parameters. The latter contain information about both the strength of the interaction and the interaction mechanism.Our calculations show that all three surfaces are magnetic. In addition, we find that applying SIC is necessary to correctly describe the top oxygen atom of the (0001)-t and (0001)-h surfaces.

On the Effect of Nanocrystallization and Disorder on the Magnetic Properties of Cu-Rich, FeMnCu Alloys

2007 ◽  
Vol 7 (2) ◽  
pp. 610-617
Author(s):  
S. J. Stewart ◽  
J. F. Marco ◽  
P. Crespo ◽  
J. J. Romero ◽  
A. Martínez ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
The Other ◽  
Ac Magnetic Susceptibility ◽  
Pure Element ◽  
Enthalpies Of Mixing ◽  
Mossbauer Spectra ◽  
Susceptibility Data ◽  
Basic Characteristics ◽  
The One

We report on the temperature dependencies of the Mössbauer spectra and the AC magnetic susceptibility measured in Cu-rich, FeMnCu samples prepared by mechanically alloying, using, on the one side, Cu and prealloyed FeMn powders and, on the other, pure element Cu, Mn, and Fe powders. From the correlation of the Mössbauer and susceptibility data we conclude about the basic characteristics of the phase distributions present in the different studied samples. Those distributions are a consequence of both the nanostructure induced upon milling and of the different signs of the Mn/Cu (negative) and Fe/Cu (positive) enthalpies of mixing. The proposed phase distributions are significantly different in the samples prepared from different precursors and this fact is analyzed in terms of the disproportion of the precursor FeMn alloy and in those of the favoured Mn/Cu interdiffusion and the hindered Fe/Cu one.

On the Effect of Nanocrystallization and Disorder on the Magnetic Properties of Cu-Rich, FeMnCu Alloys

2007 ◽  
Vol 7 (2) ◽  
pp. 610-617 ◽  
Author(s):  
S. J. Stewart ◽  
J. F. Marco ◽  
P. Crespo ◽  
J. J. Romero ◽  
A. Martínez ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
The Other ◽  
Ac Magnetic Susceptibility ◽  
Pure Element ◽  
Enthalpies Of Mixing ◽  
Mossbauer Spectra ◽  
Susceptibility Data ◽  
Basic Characteristics ◽  
The One

We report on the temperature dependencies of the Mössbauer spectra and the AC magnetic susceptibility measured in Cu-rich, FeMnCu samples prepared by mechanically alloying, using, on the one side, Cu and prealloyed FeMn powders and, on the other, pure element Cu, Mn, and Fe powders. From the correlation of the Mössbauer and susceptibility data we conclude about the basic characteristics of the phase distributions present in the different studied samples. Those distributions are a consequence of both the nanostructure induced upon milling and of the different signs of the Mn/Cu (negative) and Fe/Cu (positive) enthalpies of mixing. The proposed phase distributions are significantly different in the samples prepared from different precursors and this fact is analyzed in terms of the disproportion of the precursor FeMn alloy and in those of the favoured Mn/Cu interdiffusion and the hindered Fe/Cu one.

Note on Selection of Coordinate Systems for Geodynamics

1975 ◽  
Vol 26 ◽  
pp. 395-407
Author(s):  
S. Henriksen
Keyword(s):  
Sea Level ◽  
The Other ◽  
Coordinate Systems ◽  
Mean Sea Level ◽  
The Earth ◽  
The One ◽  
Static Systems ◽  
Selection Of

The first question to be answered, in seeking coordinate systems for geodynamics, is: what is geodynamics? The answer is, of course, that geodynamics is that part of geophysics which is concerned with movements of the Earth, as opposed to geostatics which is the physics of the stationary Earth. But as far as we know, there is no stationary Earth – epur sic monere. So geodynamics is actually coextensive with geophysics, and coordinate systems suitable for the one should be suitable for the other. At the present time, there are not many coordinate systems, if any, that can be identified with a static Earth. Certainly the only coordinate of aeronomic (atmospheric) interest is the height, and this is usually either as geodynamic height or as pressure. In oceanology, the most important coordinate is depth, and this, like heights in the atmosphere, is expressed as metric depth from mean sea level, as geodynamic depth, or as pressure. Only for the earth do we find “static” systems in use, ana even here there is real question as to whether the systems are dynamic or static. So it would seem that our answer to the question, of what kind, of coordinate systems are we seeking, must be that we are looking for the same systems as are used in geophysics, and these systems are dynamic in nature already – that is, their definition involvestime.

Stories and the Self

2020 ◽  
Vol 32 (2) ◽  
pp. 47-58 ◽  
Author(s):  
Stefan Krause ◽  
Markus Appel
Keyword(s):  
Meta Analysis ◽  
The Self ◽  
The Other ◽  
Lower Degree ◽  
Contrast Effects ◽  
Self Perception ◽  
Self Perceptions ◽  
Other Hand ◽  
The One ◽  
Implicit And Explicit

Abstract. Two experiments examined the influence of stories on recipients’ self-perceptions. Extending prior theory and research, our focus was on assimilation effects (i.e., changes in self-perception in line with a protagonist’s traits) as well as on contrast effects (i.e., changes in self-perception in contrast to a protagonist’s traits). In Experiment 1 ( N = 113), implicit and explicit conscientiousness were assessed after participants read a story about either a diligent or a negligent student. Moderation analyses showed that highly transported participants and participants with lower counterarguing scores assimilate the depicted traits of a story protagonist, as indicated by explicit, self-reported conscientiousness ratings. Participants, who were more critical toward a story (i.e., higher counterarguing) and with a lower degree of transportation, showed contrast effects. In Experiment 2 ( N = 103), we manipulated transportation and counterarguing, but we could not identify an effect on participants’ self-ascribed level of conscientiousness. A mini meta-analysis across both experiments revealed significant positive overall associations between transportation and counterarguing on the one hand and story-consistent self-reported conscientiousness on the other hand.

Radioimmunotherapy for treatment of acute myeloid leukaemia and myelodysplastic syndrome

2005 ◽  
Vol 44 (03) ◽  
pp. 107-117
Author(s):  
R. G. Meyer ◽  
W. Herr ◽  
A. Helisch ◽  
P. Bartenstein ◽  
I. Buchmann
Keyword(s):  
Acute Myeloid Leukaemia ◽  
Myeloid Leukaemia ◽  
Primary Tumour ◽  
The Other ◽  
Haematopoietic Stem Cell ◽  
Other Hand ◽  
Primary Reduction ◽  
The One ◽  
Acute Myeloid

SummaryThe prognosis of patients with acute myeloid leukaemia (AML) has improved considerably by introduction of aggressive consolidation chemotherapy and haematopoietic stem cell transplantation (SCT). Nevertheless, only 20-30% of patients with AML achieve long-term diseasefree survival after SCT. The most common cause of treatment failure is relapse. Additionally, mortality rates are significantly increased by therapy-related causes such as toxicity of chemotherapy and complications of SCT. Including radioimmunotherapies in the treatment of AML and myelodyplastic syndrome (MDS) allows for the achievement of a pronounced antileukaemic effect for the reduction of relapse rates on the one hand. On the other hand, no increase of acute toxicity and later complications should be induced. These effects are important for the primary reduction of tumour cells as well as for the myeloablative conditioning before SCT.This paper provides a systematic and critical review of the currently used radionuclides and immunoconjugates for the treatment of AML and MDS and summarizes the literature on primary tumour cell reductive radioimmunotherapies on the one hand and conditioning radioimmunotherapies before SCT on the other hand.

Das Ende der Postdemokratie, den Pessimismus überwinden.

2017 ◽  
Vol 47 (188) ◽  
pp. 487-494
Author(s):  
Daniel Mullis
Keyword(s):  
Political Thought ◽  
Social Dynamics ◽  
Social Conditions ◽  
The Other ◽  
Economic Decline ◽  
Far Right ◽  
Windows Of Opportunity ◽  
Political Events ◽  
Political Struggles ◽  
The One

In recent years, political and social conditions have changed dramatically. Many analyses help to capture these dynamics. However, they produce political pessimism: on the one hand there is the image of regression and on the other, a direct link is made between socio-economic decline and the rise of the far-right. To counter these aspects, this article argues that current political events are to be understood less as ‘regression’ but rather as a moment of movement and the return of deep political struggles. Referring to Jacques Ranciere’s political thought, the current conditions can be captured as the ‘end of post-democracy’. This approach changes the perspective on current social dynamics in a productive way. It allows for an emphasis on movement and the recognition of the windows of opportunity for emancipatory struggles.

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