摘要:

The digital computer is a common instrument in many laboratories; it is no longer necessary to describe its operating characteristics in detail. However, it is not yet generally used in an entirely satisfactory manner nor are its full capabilities understood and exploited in laboratory automation. Some of the more pressing issues to be understood and resolved are opti-minal trade-offs between hardware and software, dedicated computer automation versus automation via time-shared systems, single-processor time-shared systems versus multiprocessor hierarchical time-shared systems, and the development of a real-time high-level control language.

ISSN:1073-9149    

DOI:10.1080/10739147008543283

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

A design is presented for a polarographic cell that minimizes the iR error in controlled-potential polarography of solutions possessing a high specific resistance. A sharpened Smoler 90° vertical orifice DME is used. With this electrode, the mercury drop grows principally in the downward direction. This and the fact that the end of the capillary is sharpened to a point allows the positioning of a micro reference electrode probe directly above the mercury drop and to within 0.1 of the maximum radius of the mercury drop from the mercury surface during the entire drop life time. With this apparatus it is also possible to observe the iR error as a function of the distance between the reference electrode tip and the mercury drop surface. The effect of reference electrode position on iR error introduced is illustrated by a series of uranium and cadmium polarograms in high specific resistance media. Controlled-potential polarograms with little distortion attributable to iR error can be obtained with this cell design in solutions with specific resistances up to at least 22,000 Ω-cm.

ISSN:1073-9149    

DOI:10.1080/10739147008543284

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

The viscometer described in this note is of general applicability but its features are particularly suited for measurements with molten salts having appreciable vapor pressures and/or chemical reactivity to atmospheric moisture. While sealed viscometers are not unknown [1, 2], the present design ensures a constant starting volume and minimizes some of the inherent experimental difficulties, for example, calibration, repeated measurements, and kinetic energy and surface tension corrections. Magnitude and sources of errors are briefly considered, and results with this viscometer for KN03(mp, 337°C), HgCl2(mp, 277° C; bp, 304°C), and CsN03(mp, 414°C) are reported.

ISSN:1073-9149    

DOI:10.1080/10739147008543285

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

Measurement of the limiting diffusion current with fixed diffusion layer is the most suitable of the various methods for determining the fuel concentration in the electrolyte of hydrazine-oxygen fuel cells.

ISSN:1073-9149    

DOI:10.1080/10739147008543286

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

A simple cryostat for obtaining the spectra of solutions and rigid glasses over the temperature range ∼80-300°K is described. Designed specifically for the Cary Model 14 spectrophotometer, the cryostat has features that enable the experimenter to control, by annealing, the optical properties of the glasses formed and to regulate the temperature closely. Also described is an optical solution cell design which permits fast warm-up of the samples without costly breakage.

ISSN:1073-9149    

DOI:10.1080/10739147008543287

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

The design and construction of a phosphorimeter especially suited for investigating the effect of a magnetic field on delayed luminescence processes is described. Although it is designed for the light levels and time domains usually pertinent to fluid-solution delayed fluorescence studies, it can be easily adapted to phosphorescence work. In order to avoid the influence of the applied field on the excitation and detection elements, these components are removed from the field and are heavily shielded. A medium-pressure mercury arc is used as an excitation source, and either frontal or right-angular illumination of the sample can be employed. Filters in both the excitation and emission beams provide the means of wavelength selection. The use of a single, rotating, slotted disk to time both beams gives the instrument a compact design and enhances its physical stability. Tests of instrument performance show that the phosphorimeter is useful for measurements at fields up to 8000 G.

ISSN:1073-9149    

DOI:10.1080/10739147008543288

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

As an analytical tool, pyrolysis has been extensively used for the qualitative identification of polymers, barbiturates, amines, starches, and other substances [1]. For this purpose the organic material is rapidly heated on a filament, in a sealed ampul, or in a tubular reactor, and the pyrolytic products then subjected to either IR or gas chromatographic examination. In addition to yielding pyrograms of the organic substances, the latter technique has permitted unequivocal identification of materials in many instances.

ISSN:1073-9149    

DOI:10.1080/10739147008543289

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

ISSN:1073-9149    

DOI:10.1080/10739147008543290

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor