ISSN:0021-8871    

DOI:10.1002/jctb.5010091011

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractA method for the determination of fulvic acids present in naturally‐occurring waters has been developed, based on the measurement of the ultra‐violet absorption spectrum of the sample. The method has been applied to samples of water from different parts of the country, and the results indicate that for moorland waters the fulvic acids are very similar in all samples. Their concentrations varied between 2 and 30 p.p.m. for moorland waters, but were appreciably smaller (0.6 p.p.m. and less) in hard well‐w

ISSN:0021-8871    

DOI:10.1002/jctb.5010091001

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractA method has been investigated for determining organic matter in moorland‐type waters based on oxidation with potassium permanganate. Results show that fulvic acids account for the bulk of the oxygen demand of the sample, and the method may therefore be used for determining the approximate concentration of these acids in such water

ISSN:0021-8871    

DOI:10.1002/jctb.5010091002

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractThe results from a new precise determination of theP‐V‐Tproperties of pure acetylene are presented in tabular form for the range 0–40°and 0

ISSN:0021-8871    

DOI:10.1002/jctb.5010091003

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractIn the isolation of surface films from aluminium alloys, by dissolving the metal in iodine‐methanol solution, the rate at which the aluminium is dissolved depends upon the relative humidity of the atmosphere in contact with the solution. Controlled‐humidity experiments have shown that, at 30°c, the most favourable relative humidity is about

ISSN:0021-8871    

DOI:10.1002/jctb.5010091004

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractThe direction of isothermal water transfer between two aqueous systems and its theoretical maximum value are directly deducible from a diagram describing water partial vapour pressure as a function of concentration for each of these systems. Such deductions remain approximately valid when a partially miscible solvent is used as a transfer medium provided all solutes present have only small or negligible partition coefficients with respect to it. The possible extent of water transfer is necessarily affected by the intervention of a solvent and can be computed exactly only from diagrams of solvent hydration as a function of concentration of solute in the aqueous phase.Several features of butanol‐1, butanol‐2 and butanone as water transfer media are compared and evalua

ISSN:0021-8871    

DOI:10.1002/jctb.5010091005

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractA cumulative method of particle size analysis is described wherein the mass deposited from an homogeneous suspension by gravitational or centrifugal force is determined by a β‐back‐scatter thickness measurement technique. The method is applicable to compounds having an effective atomic number greater than 16, and comparisons of results obtained by this and other methods for thoria, urania, zirconia and lithopone powders are g

ISSN:0021-8871    

DOI:10.1002/jctb.5010091006

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractA simplified partition cell has been developed for the investigation of gas‐liquid equilibria. In it, the two phases may be brought to equilibrium fairly rapidly, isolated and then sampled separately. The cell gives results comparable with those already published by other workers. Results for the absorption of CO2in water at 30°and pressures up to 300 p.s.i.g. are giv

ISSN:0021-8871    

DOI:10.1002/jctb.5010091007

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractThe equilibria between CO2and sodium carbonate solutions have been studied at moderate pressures by means of a partition cell, and using chemical methods of analysis.In the case of the absorption of CO2alone, total conversion of the carbonate to bicarbonate takes place and in addition considerable amounts of ‘free’ CO2are found in solution.The equilibria involving CO2and H2S have been studied at 20 atmospheres pressure and at temperatures from 30°to 60°, using nitrogen as an inert gas. The amounts of ‘free’ CO2and H2S in solution, calculated using published data on the chemical equilibrium, decrease with increase in temperature and solution concentration.The influence of ‘free’ molecular species on absorption is brie

ISSN:0021-8871    

DOI:10.1002/jctb.5010091008

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractBituminous road binders have been prepared containing dispersed long‐chain polymers, including both natural and synthetic rubbers, and also certain South African coals dispersed in them under high temperature conditions.Examination of the rheological properties of these binders has confirmed that both types of additive produce an improvement of the viscosity/temperature characteristics and a reduction in brittleness at low temperature. If both coal and polymer are incorporated together, however, the improvement is greater than that calculated from the sum of the separate effects of the two additives.Some of the polymers studied were found to stabilise mixtures of pitch and petroleum bitumen which are normally not completely miscible.An apparatus is described for assessing brittleness under stress and loading times of the same order as those occurring on the road under traffic. The methods of test used in the investigation are critically discusse

ISSN:0021-8871    

DOI:10.1002/jctb.5010091009

出版商:John Wiley&Sons, Ltd    

年代:1959

数据来源: WILEY