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.

scholarly journals The ultra-violet spectrum of magnesium hydride.—II. The many-lined γ-system

1929 ◽  
Vol 125 (796) ◽  
pp. 157-179 ◽  
Keyword(s):  
Molecular Weight ◽  
Energy Levels ◽  
Visible Region ◽  
Ultra Violet ◽  
Magnesium Hydride ◽  
The Many ◽  
The One ◽  
Low Pressures

During the course of investigation of the bands at λλ 5622, 5211 and 4845, emitted by the magnesium arc in hydrogen at low pressures, Prof. A. Fowler observed that they were always accompanied by a further band at λ 2430 and by series of double lines in the region λ 2940 to λ 3100. These features of this spectrum seemed to merit further study in view of the important part played by the spectra of other molecules with 13 electrons (CN, BO, BeF, CO + , N 2 + ) in the classification of molecular energy levels. Further, MgH is one of the interesting series of hydrides (BeH, MgH, CaH, ZnH, CdH, HgH) which show a pair of excited P states, with doublet separation increasing with molecular weight, closely resembling the lowest 2 P state of the preceding monovalent atoms (Li, Na, K, Cu, Ag, Au). An account of an analysis of the band at λ 2430 was given in a previous paper; the present paper deals with the series of double lines. For convenience the system in the visible region is referred to as the α-system, the one represented by the band at λ 2430 as the β-system, and that about to be described as the γ-system.

scholarly journals INFLUENCE OF LIGHT ON THE GROWTH AND MALIGNANCY OF A TRANSPLANTABLE NEOPLASM OF THE RABBIT

1927 ◽  
Vol 45 (3) ◽  
pp. 483-496 ◽  
Author(s):  
Louise Pearce ◽  
C. M. Van Allen
Keyword(s):  
Experimental Evidence ◽  
Malignant Disease ◽  
External Factor ◽  
Continuous Light ◽  
Ultra Violet ◽  
The Other ◽  
Constant Light ◽  
Constant Darkness ◽  
Light Conditions ◽  
The One

An experiment is reported in which an environment of constant and continuous light excluding the shorter ultra-violet rays, and one of constant darkness, have influenced the course and character of a malignant disease of rabbits induced by a transplantable neoplasm. Under the influence of constant light the level of malignancy was observed to be low; under the influence of constant darkness the level of malignancy was somewhat lower than in the control animals living under ordinary indoor light conditions, but the level was not as low as among the animals constantly illuminated. These observations furnish experimental evidence in support of the idea that there is a correlation between the external factor of light on the one hand and the manifestations of an experimental malignant disease on the other.

The Transformation of Thiols Compounded in Raw Rubber

1951 ◽  
Vol 24 (4) ◽  
pp. 914-915
Author(s):  
Jeanle Bras ◽  
Michel Montu
Keyword(s):  
Absorption Spectra ◽  
Analytical Method ◽  
Ultra Violet ◽  
Transformation Products ◽  
Ultraviolet Absorption ◽  
The Other ◽  
Inert Gas ◽  
Rubber Industry ◽  
Acetone Extraction ◽  
The One

Abstract During the last few years the rubber industry has made use of certain thiols, under the technical name of peptizing agents, which have the property of accelerating the plasticization of raw rubber during mastication. It is now known that this process of plasticization involves oxidation of the rubber, and that it does not take place in an atmosphere of an inert gas. Accordingly the present authors were induced, on the one hand, to follow the transformation of thiols during their participation in the mastication of rubber and, on the other hand, to observe their influence on the tendency of rubber to oxidize. In the first of these objectives, the analytical method utilized was ultra- violet absorption spectrography. To avoid pertubations in the spectra caused by the resins present in rubber, crepe rubber purified by acetone extraction was used in the experiments. The rubber was masticated at 100° C, and the thiol was added soon after the beginning of this mastication in the proportion of 5 per cent of the rubber. Samples were withdrawn at successive intervals of time, and the transformation products of the thiol, which were isolated by acetone extraction, were identified by their ultraviolet absorption spectra. In these experiments, chloroform solutions containing 0.5 gram per liter were employed.

scholarly journals Observations in connection with the band systems of the fluorides of beryllium and magnesium

1929 ◽  
Vol 122 (789) ◽  
pp. 211-227 ◽  
Keyword(s):  
Electronic Transition ◽  
Band System ◽  
Visible Region ◽  
Ultra Violet ◽  
Band Head ◽  
The Other ◽  
Swan Band ◽  
Electron Emitters ◽  
Made In

Until quite recently only two band-systems had been attributed to com­pounds of beryllium, BeF being the emitter of one system, which occurs in the ultra-violet, and BeO that of the other system, which lies in the visible region. The former molecule is one of a series of thirteen-electron emitters known band-systems, namely, CN, N 2 + , CO + , BO, BeF, and MgH. The other molecule BeO is of interest on account of the fact that, like the emitter NaH, it has the same number of electrons (twelve) as C 2 , in which an electronic transition 3 P → 3 P is responsible for the emission of the Swan band-system. The observations recorded in the first part of the present paper were made order to ascertain whether any further bands might be attributed to BeF and BeO. The description of the newly observed bands (in section 4) is, for convenience, preceded by a discussion of the known systems. In the course this discussion the data for BeF band-heads are re-examined and a modified interpretation of the heads is suggested (in section 2); and some corrections and additions to, the band-head data for the BeO system are also made (in section 3).

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.

scholarly journals The spark-spectra of indium and gallium in the extreme ultra-violet region

1925 ◽  
Vol 107 (741) ◽  
pp. 138-156 ◽  
Keyword(s):  
Wave Length ◽  
Ultra Violet ◽  
Spectral Lines ◽  
The Other ◽  
Pressure Tubing ◽  
Quartz Spectrograph ◽  
One Stop ◽  
The One ◽  
Gas Tight ◽  
Concave Grating

The spark-spectrum of indium in the ultra-violet has been especially studied by Saunders, that of gallium by Saunders and Klein. By the use of a one-metre concave grating, mounted in a brass tube which could be exhausted, Saunders was able to extend the indium spark-spectrum as far below into the ultra-violet as λ = 1699 A. U. The line of shortest wave-length as yet noted in the gallium spark-spectrum—namely, λ = 2176 A. U.—was measured by Klein with a large quartz spectrograph whose mounting was of the Littrow type. With the object in view of making a complete and comprehensive examination of the spark-spectral lines of the above elements, that should extend right through the extreme ultra-violet and the quartz regions, the following investigations were undertaken. A.— Experiments in the Quartz Region . 1. Description of Apparatus .—For studying the spectra in the quartz region a spark chamber, diagrammatically shown in the figure, was employed. The spark chamber proper was a pyrex bulb about 7 inches in diameter. The terminals were of gallium and aluminium in the one experiment, and indium and aluminium in the other. Gallium has a very low melting point (30·2° C.). It was therefore placed in a tiny quartz cup, which, supported by a long aluminium rod, formed the lower terminal for the discharge. A piece of tungsten wire led from the aluminium support through the stem of the cup to the gallium. The upper electrode was of aluminium filed down to a point. Pieces of pressure tubing, 2 inches in length, lined with soft wax, fitted over the terminal supports and the tube elongations from the spark chamber. These formed gas-tight moveable joints, and served for the purpose of adjusting the spaek gap. The gap ranged from 2 to 3 mm. in width. The quartz window, through which the light passed into the spectrograph, was fastened to the spark chamber with sealing wax. One stop-cock led to the exhaust pumps, the other to the system of drying tubes. The spark was produced by a primary current of 110 volts ranging from 4 to 6 amperes. A Hilger Quartz-Prism Spectrograph, Type A, was used. All photographs were taken on Schumann plates.

scholarly journals I. On Nova anrigæ

1892 ◽  
Vol 51 (308-314) ◽  
pp. 485-495
Keyword(s):  
Royal Society ◽  
Visible Region ◽  
Ultra Violet ◽  
The Other ◽  
Preliminary Note ◽  
Solar Rays

We had the honour in February last of communicating to the Royal Society a short preliminary note on the remarkable spectrum of this temporary star. We beg now to present a fuller account of our observations, together with two maps of the spectrum of this star, and some theoretical suggestions as to its nature. One map represents the result of our work by eye in the visible region; the other map has been drawn from a photograph of its spectrum, taken without its light having passed through glass, and which extends into the ultra-violet nearly as far as the absorption of our atmosphere permits even the solar rays to pass.

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.

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