Ground Glass Joints Research Articles

Sealing Fluid for Ground Glass Joints in Liquid Helium II

Sealing Fluid for Ground Glass Joints in Liquid Helium II

Limitations of Tubular Ground Glass Joints

A consideration of the stresses involved in ground glass joints when used in vacuum apparatus indicates that the weakest part of such a joint is the wall of the outer member. For dependable large joints all the dimensions should be increased proportionally. After grinding it is suggested that the surfaces be etched slightly to relieve strains.

A comparison of the rate of metabolic activity in the solitary and migratory phases of Locusta migratoria

The occurrence of locusts in two extreme forms or phases, viz., the phasis gregaria and the phasis solitaria was first envisaged as a theoretical conception by Uvarov (1921). It was subsequently confirmed experimentally by Faure (1932), whose main results have been repeated by other observers. Given suitable temperature, humidity, and food, it is now known to be a comparatively easy matter to induce Locusta migratoria , for example, to develop into either phase. In a few words, individuals reared from the egg in isolation develop evident solitaria characters, whereas those reared collectively in large numbers assume the gregaria, or migratory, phase. The differences that have been described as being characteristic of these two phases are those of behaviour, coloration, and of morphological structure. It may be argued that these very evident differences are likely to be accompanied by others of a physiological nature. With the object of exploring possible physiological differences between the two phases, we have studied the rate of oxygen uptake of all the instars of Locusta migratoria , in both its solitary and migratory forms, using this criterion as an indication of the rate of metabolic activity. 2―Technique Employed A special Barcroft apparatus was devised, with cylindrical bulbs of 5 inches in length, all the ground glass joints being sealed with mercury to prevent any leakage during the course of an experiment. The locusts used were all obtained 3 days after each had moulted and were then starved for 24 hours before the experiment. Every care was taken to use the insects in exactly the same condition, as regards feeding and development, in order to allow of a fair comparison being made.

Scientific Glassware Standards. B.S.I. specifications for distillation flasks and for ground-glass joints

Scientific Glassware Standards. B.S.I. specifications for distillation flasks and for ground-glass joints

Interchangeable ground glass joints for laboratory glassware

This paper presents the application of autoregressive integrated moving average (ARIMA), seasonal ARIMA (SARIMA), and Jordan-Elman artificial neural networks (ANN) models in forecasting the monthly streamflow of the Kizil River in Xinjiang, China. Two different types of monthly streamflow data (original and deseasonalized data) were used to develop time series and Jordan-Elman ANN models using previous flow conditions as predictors. The one-month-ahead forecasting performances of all models for the testing period (1998-2005) were compared using the average monthly flow data from the Kalabeili gaging station on the Kizil River. The Jordan-Elman ANN models, using previous flow conditions as inputs, resulted in no significant improvement over time series models in one-month-ahead forecasting. The results suggest that the simple time series models (ARIMA and SARIMA) can be used in one-month-ahead streamflow forecasting at the study site with a simple and explicit model structure and a model performance similar to the Jordan-Elman ANN models.

Lubricants for Ground-Glass Joints1

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLubricants for Ground-Glass Joints1M. J. Bradley and H. E. WilsonCite this: Ind. Eng. Chem. 1926, 18, 12, 1279–1280Publication Date (Print):December 1, 1926Publication History Published online1 May 2002Published inissue 1 December 1926https://doi.org/10.1021/ie50204a027RIGHTS & PERMISSIONSArticle Views20Altmetric-Citations1LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (300 KB) Get e-Alerts

A Device for using Mercury Seals on Ground Joints in Horizontal or Inverted Positions

WHILE working with Dr. Anderson's vacuum spark apparatus recently, I used mercury seals on certain ground glass joints, not all of which could be upright. It was found that, by turning the apparatus so that an inverted or horizontal joint became upright, and flowing over the mercury some fairly thick solution of celluloid or collodion in amyl acetate, the film so formed over the mercury adhered well to the glass when dry, and would hold the mercury in place whatever the position of the joint. The film should be rather thick, but it is very easily removed and is sufficiently elastic to stand ordinary handling of the apparatus without rupture or separation from the glass.

The Use of Standard Dies in Making Ground Glass Joints.

The Use of Standard Dies in Making Ground Glass Joints.