Particle Type Testing
Particle Type Testing - Related Videos
01:11
Types of Hypothesis Testing
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2023
There are three types of hypothesis tests: right-tailed, left-tailed, and two-tailed. When the null and alternative hypotheses are stated, it is observed that the null hypothesis is a neutral statement against which the alternative hypothesis is tested. The alternative hypothesis is a claim that instead has a certain direction. If the null hypothesis claims that p = 0.5, the alternative hypothesis would be an opposing statement to this and can be put either p > 0.5, p < 0.5, or p ≠ 0.5.
07:06
Particle Agglutination Method for Poliovirus Identification
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2011
A recently developed novel particle agglutination (PA) assay utilizing virus receptor molecule allowed a rapid and easy identification of poliovirus (PV). In this article, we will show the procedure for the PA assay for PV identification.
03:37
Subatomic Particles
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2020
Dalton was only partially correct about the particles that make up matter. All matter is composed of atoms, and atoms are composed of three smaller subatomic particles: protons, neutrons, and electrons. These three particles account for the mass and the charge of an atom. The Discovery of the Electron The first clue about the subatomic structure came at the end of the 19th century when J.J. Thomson discovered the electron using a cathode ray tube. This apparatus consisted of a sealed glass...
02:41
Concentration and Purification of Viral Particles
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2026
Source: Fricano-Kugler, C. J., et al. Designing, Packaging, and Delivery of High Titer CRISPR Retro and Lentiviruses via Stereotaxic Injection. J. Vis. Exp. (2016).This video demonstrates the step-by-step process for concentrating and purifying lentiviral particles from a mixed suspension containing host cell debris. The procedure utilizes centrifugation, filtration, and PEG-salt precipitation to isolate viral particles while removing soluble impurities. The final product is resuspended in a...
10:09
Tests of Hardened Concrete in Tension
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2023
Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA In a previous laboratory focused on concrete in compression, we observed that concrete can withstand very large stresses under uniaxial compressive forces. However, the failures observed were not compressive failures but failures along shear planes where maximum tensile forces occur. Thus, it is important to understand the behavior of concrete in tension and particularly its maximum strength...
FAQs
The appropriate properties depend on the investigation and the material. Size may help characterize changes in a powder or suspension, while shape, composition, or physical behavior may better distinguish contamination, wear debris, or agglomeration. Selecting properties that match the suspected problem makes comparisons more meaningful and helps connect laboratory observations with manufacturing, maintenance, or material-performance decisions.
Each property describes a different aspect of particle behavior or origin. Size can indicate shifts within a powder or suspension, shape can support classification, and composition can help distinguish unwanted material from expected particles. Physical behavior adds another comparison point. Considering several properties together can produce a more informative interpretation than relying on a single observation.
Analysts compare measured or separated particles with reference criteria to determine whether the observed population matches expected material characteristics. This comparison helps identify departures associated with contamination, wear debris, agglomeration, or process changes. The value of the result depends on using criteria suited to the material and investigation, rather than treating every particle population as equivalent.
A typical workflow begins by examining the material and selecting a suitable measurement or separation approach. Analysts then evaluate relevant particle properties, organize the observations into meaningful classifications, and compare the results with reference criteria. The final interpretation relates those findings to the investigation, such as a suspected process change, contamination event, filtration issue, or material-performance concern.
Particle type testing supports quality control, failure analysis, and evaluation of manufacturing processes. It can also be applied to filtration systems, environmental samples, powders, suspensions, and materials showing possible wear or contamination. These uses allow engineers to identify meaningful changes in particle populations and use the findings to guide maintenance, processing decisions, or design evaluation.
Particle results provide evidence about conditions that may affect a material, process, or system. Detecting contamination, wear debris, agglomeration, or other changes can prompt closer examination of manufacturing performance, filtration, or maintenance needs. In this way, classification data supports more informed decisions about material suitability, design reliability, processing control, and safety rather than relying only on general observations.