Versatile Laboratory Research Articles

Versatile low-cost laboratory integrator

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVersatile low-cost laboratory integratorDonald R. KendallCite this: Anal. Chem. 1972, 44, 6, 1109–1111Publication Date (Print):May 1, 1972Publication History Published online1 May 2002Published inissue 1 May 1972https://doi.org/10.1021/ac60314a040RIGHTS & PERMISSIONSArticle Views41Altmetric-Citations3LEARN 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 (336 KB) Get e-Alerts Get e-Alerts

A Versatile Laboratory Programmer

The logical design of a versatile laboratory programmer is described. The programmer can be used to control the operation of low and high power circuits over a wide range of time intervals.

STAP-8: A subroutine package for statistical online analysis of simultaneous neuronal spike trains

This paper presents a computer program including a subroutine package for the statistical analysis of neuronal spike trains. Extended use was made of an information display concept, on-line control via teletype intercommunication and the use of a versatile laboratory peripheral, including, among other features, Schmitt-Trigger inputs, multiplexed analog-digital converters, and a variable RC-clock. The software, written exclusively in the system's specific symbolic assembler language, was compiled and tested on a LAB-8 System of DEC, extended with the Arithmetic Element MP8/1, the Mini-Disk DF32, and the Tektronix Type 601 Storage Oscilloscope, and is available as an assembly listing together with the binary paper tape. From the neuronal spike trains recorded simultaneously by two Schmitt-Trigger inputs, interspike intervals are counted by the RC-clock counting chain and translated into 12-bit positive integers. These interval data files stored on the disk are available to eight different analysis programs: Interval histogram, autocorrelogram, cumulative distribution function, conditioned probability density, serial correlogram, cross-correlogram, post-stimulus time histogram, and time interval sequence. The results are given as a function or histogram display, or may be punched on paper tape for further analysis.

Untersuchung der Elektronenempfindlichkeit von Si-oberflächensperrschichtzählern mit Hilfe eines magnetischen Sektorfeldspektrometers: 1. Das Sektorfeldspektrometer

This first part of the paper describes the calculation and design of a symmetric, double focusing 75° sector field spectrometer which is used for response measurements of solid state detectors given in part 2. The design feature was derived from the use as a versatile laboratory instrument for generating a monochromatic parallel beam of electrons of energies up to 3 MeV. The specific data of the instrument are: Radius of curvature: ϱ = 6.62 cm , Distance effective-field-boundary to radioactive source: l = 17.25 cm , Resolution: Δp/p = 1.5%, Solid angle: Ω = 0.1%, Pole-piece gap: k = 2.0 cm .

Versatile high-temperature laboratory preparative gas-liquid chromatography manifold and trapping assembly

A dual manifold preparative GLC trap assembly is described. The design provides a second-pass trap for increased sample recovery. There is a reduction in component loss by aerosol breakup (vaporization) before entry to the second-pass trap. The reduction in gas velocity by dual trap collection of single components results in increased trapping efficiency. Isolation for separate heat control of the hot incoming trap inlet gases and the cool trap outlet gases for continuous temperature readout results in a minimum of thermal degradation of purified sample.

A Versatile Laboratory Equipment for Control Systems Experiments with Electrical Machines

A Versatile Laboratory Equipment for Control Systems Experiments with Electrical Machines

Continuous pyrolytic graphite composite filaments

Advances in aeronautics and astronautics have created a need for new and improved structural and thermally protective materials, which are stable or capable of accommodating ultra high temperatures, mechanically erosive forces, and chemically corrosive environments. New physical forms of materials are thus being developed at an urgent pace, and of these, filamentary reinforced composites are among the most promising. For thermally protective use, carbon and graphite fiber reinforced composites have considerable merit, but current forms of the materials have some deficiencies. Through in-house research by the Air Force Materials Laboratory, continuous pyrolytic graphite filaments have now been synthesized in diameters from 25 to 125 /z and individual lengths up to 2600 ft. They are composed of an inner core of tungsten carbide with an overcoating of a pyrolytic refractory-like highly turbostatic carbon. To obtain these filamentous materials, a novel and versatile laboratory apparatus was designed, built, and successfully operated. The newly developed filamentous materials have potential uses in many future Air Force applications, like ablative and reinforced plastic structures, filament-wound composites, thermal insulation inflatable re-entry structures, thermally protective fabrics, and possibly other important uses. I. Introduction E NVIRONMENTS of very high temperature, high shear force and chemical reactivity have been generated by modern rocketry. Ablative and structural composite materials containing fibrous reinforcements have shown great potential for withstanding such environments. However, currently available fibers may not be entirely adequate for future uses because of the ever increasing material property requirements (thermal stability, strength, capability, etc.), and the associated effects of hyperenvironmental constituents on material performance. Highly refractory materials in bulk form have been made available which meet some of the anticipated future needs. Refractory fiber reinforced composites are preferred to bulk materials, however, because of their inherent versatility and the ability to tailor properties to the specific application requirements. Fibrous refractories for these composites are not presently available in proper compositions, physical structure, or amounts, and thus considerable interest exists in preparing such materials. The objective of this report concerns the preparation of pyrolytic graphite in continuous filament form. The research program designed to fulfill the objective was detailed into the following phases: 1) develop a laboratory apparatus for obtaining continuous pyrolytic graphite filaments; 2) examine the utility of existing chemical vapor-plating processes and improve them in applicable areas; 3) investigate the suitability of various hydrocarbon compounds as the graphite precursor material; and 4) produce continuous lengths of pyrolytic graphite filaments using a tungsten wire substrate.

Focal points: First aluminum, deepest diving submarine will function as versatile deep-sea laboratory

Focal points: First aluminum, deepest diving submarine will function as versatile deep-sea laboratory

Developmental Changes in the Plasma Protein Pattern of the Mouse

KNOWLEDGE of the changes in the pattern of plasma proteins during the development of the mouse is desirable not only from the embryological but also from the genetical point of view, because of the existence of many inbred lines of this versatile laboratory animal.

A d.c. and square wave a.c. resistance and voltage comparator

A compact resistance and voltage comparator employing an isolating potential circuit with mechanical choppers has proved to be a versatile and accurate laboratory tool. Voltages can be compared with an accuracy of 10-8 V and resistors with an accuracy of 2 parts in 106 (d.c. operation) or 2 parts in 105 with automatic cancellation of thermal e.m.f. (square wave operation). When a d.c. amplifier and recorder are used, voltage and resistance differences may be recorded with an accuracy of about 2 parts in 103.

Two Versatile Laboratory Coating Machines Based on Designs by Samuel B. Grimson

This paper describes the design and construction of two small coating machines, one for film, and the other for glass. Special features of these machines include the adaptability for use with a variety of coating liquids, the ability to be operated with very small volumes of liquid, and simple means for the accurate control of the layer thickness. The film-coating machine incorporates a new coating head which is especially useful for the application of volatile coating liquids and multilayer coatings. The working principles and performance characteristics are illustrated by typical applications.

A versatile laboratory scale atomizer for use at reduced pressures

A versatile laboratory scale atomizer for use at reduced pressures

The Type 310-A Z-Angle Meter, a New Instrument for Electrical and Electroacoustic Measurements

The importance of impedance and phase angle measurement over a wide range of frequencies of electrical and electro-acoustic apparatus such as amplifiers, microphones, loudspeakers, transmission lines, and other electrical networks having electrical or mechanical resonances, has long been recognized. Up to this time, engineers requiring such measurements have been forced to resort to hastily made laboratory set-ups using the two-voltmeter method of measuring impedance, to use a.c. bridge methods which inherently are not well adapted to this type of measurement, or to construct special apparatus designed around their own particular requirements. This paper describes the principle of operation of a new instrument, the Type 310-A Z-Angle Meter, which is designed specifically for these applications and which, in addition, because of its wide ranges of R, L, and C, is an extremely versatile general purpose laboratory instrument. Applications of specific interest to those concerned with electro-acoustic measurements, along with examples showing its applications to other types of measurement, are described.

Efficient and Versatile Laboratory Fractionation Column Assembly

Efficient and Versatile Laboratory Fractionation Column Assembly

Versatile Continuous Laboratory Extractor

Versatile Continuous Laboratory Extractor