Laboratory Specimen Articles
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Slide Warmer Cheat Sheet
Slide warmers have multiple functions and can do much more than “warm” slides. The main purpose of a slide warmer is to dry or warm slides and help stain slides. Here are some other functions customers use our slide warmers for: Warm gel packs: Believe it or not, we get requests to buy slide warmers to warm gel packs. Doctors’ offices place the gel packs on the warmer ...
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University of Washington Medical Center - CDS-5 Cytogenetic Drying Chamber - Case Study
It’s not often you lovingly hug a 450-pound piece of equipment, but if it makes your work life easier you show your appreciation. The CDS-5 helps lab technologists create consistent and reliable environments for their work regardless of the day-to-day variables, like the weather. Imagine the weather outside impacting your office work indoors. Sounds inconvenient, right? That used to be a ...
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Analysis of low-angle X-ray scattering profiles from irradiated blood samples
The Transfusion-Associated Graft-Versus-Host Disease (TA-GVHD) is a serious potential complication of blood transfusions that is essentially prevented by blood product irradiation. In this study, scattering profiles from lyophilised and irradiated samples of plasma (PL) and formed elements (MC) were compared with non-irradiated ones. Fresh blood specimens were obtained from volunteers by vein ...
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Measurement of Shear Waves in Laboratory Specimens by Means of Piezoelectric Transducers
The use of piezoelectric ceramics to measure shear wave velocity in laboratory soil specimens is discussed. The experimental technique and interpretative methodology are described. Both bender and flat-plate ceramic elements were employed, and each performed well. Interpretation of the shear waveforms generated with each transducer improved as the number of wavelengths between the source and ...
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Strength Changes in Sand Following Cyclic Shear
Static torsional simple shear tests were performed on poorly graded sand, with and without prior cyclic loading, to evaluate changes in static shear strength. Specimens were prepared at three densities (loose, medium, and dense) and were subjected to one of three levels of cyclic loading corresponding to 0.25, 0.50, or 0.75 times the static stress level, causing failure with no prior cyclic ...
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Hollow Cylinder Specimen Preparation: Cohesive Materials
Techniques for rapid and precise fabrication of hollow cylinder specimens of cohesive materials are presented. A device to accelerate the displacement sensor mounting process is ...
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Influence of Storage and Reconsolidation Procedures on Clay Properties
The delay between sampling and testing of clay specimens and the control kept over their volumes during storage are known to affect the strengths and compressibilities subsequently measured in the laboratory. The measured properties are also affected by reconsolidation procedures. This paper deals with reconstituted specimens of illite stored for fixed periods of up to one week, reconsolidated ...
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Modified Bromhead Ring Shear Apparatus
A modified Bromhead ring shear apparatus is described, which incorporates vanes on the loading surfaces to improve torque transfer to the specimen. The specimen thickness is increased to accommodate the vanes. A method of specimen preparation is described that ensures a flat shear surface in the center of the specimen. Results are given for the residual failure envelope of Lias clay using the ...
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Factors Affecting Sand Specimen Preparation by Raining
Among the available procedures for obtaining reconstituted laboratory sand specimens, pluvial compaction appears to best simulate the natural processes leading to formation of sand deposits. Although widely used for a long period of time, effects of some components of the specimen preparation equipment (sand rainer) on the relative density of the specimen formed have not been comprehensively ...
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Method of Test for Determining the Splitting Tensile Strength of Rocks
A standard method of determining the splitting tensile strength of rock is proposed. It covers the specifications of the testing apparatus, specimen preparation, procedures, data reduction, and the report ...
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Preparing Test Specimens Using Undercompaction
A specimen preparation procedure is presented that offers an improved method of preparing reconstituted sand specimens for cyclic triaxial testing. The method leads to more consistent and repeatable test results. This procedure (1) minimizes particle segregation, (2) can be used for compacting most types of sands having a wide range in relative densities, and (3) permits determination of the ...
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