Goniometer
Goniometer - Related Videos
08:43
Diagnosis of Musculus Gastrocnemius Tightness - Key Factors for the Clinical Examination
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Cited by 12 •
2016
Isolated Musculus gastrocnemius tightness is a common cause for foot and ankle pathologies. Currently no standardized examination procedure exists. This manuscript demonstrates that 20 degree of knee flexion eliminates the restraining effect of the M. gastrocnemius on ankle dorsiflexion and presents a video description of a standardized examination protocol.
09:20
A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction
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Cited by 12 •
2016
We present a method to control the interfacial energy of a liquid metal in an electrolyte via electrochemical deposition (or removal) of a surface oxide layer. This simple method can control the capillary behavior of gallium-based liquid metals by tuning the interfacial energy rapidly, significantly, and reversibly using modest voltages.
09:48
Intracortical Inhibition Within the Primary Motor Cortex Can Be Modulated by Changing the Focus of Attention
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Cited by 21 •
2017
Using two different transcranial magnetic stimulation (TMS) protocols, this manuscript describes how to measure and compare cortical inhibition within the primary motor cortex when adopting different attentional foci.
10:54
Cryo-electron Microscopy Specimen Preparation By Means Of a Focused Ion Beam
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Cited by 5 •
2014
Cryo Electron Microscopes, either Scanning (SEM) or Transmission (TEM), are widely used for characterization of biological samples or other materials with a high water content1. A SEM/Focused Ion Beam (FIB) is used to identify features of interest in samples and extract a thin, electron-transparent lamella for transfer to a cryo-TEM.
07:33
Physical Properties Of Minerals I: Crystals and Cleavage
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2023
Source: Laboratory of Alan Lester - University of Colorado Boulder The physical properties of minerals comprise various measurable and discernible attributes, including color, streak, magnetic properties, hardness, crystal growth form, and crystal cleavage. Each of these properties are mineral-specific, and they are fundamentally related to a particular mineral’s chemical make-up and atomic structure. This experiment examines two properties that stem primarily from symmetric repetition of...
FAQs
The instrument can obtain angular information through several designs. A calibrated arm is rotated until the relevant geometric relationship is established, optical components can be aligned to define an angle, or a liquid-droplet profile can be analyzed on a solid surface. The selected mode therefore depends on whether the measurement concerns geometry, optics, or an interface.
Angles between crystal faces provide information about the geometric relationships that define a crystal’s external form. Measuring these interfacial angles supports morphological analysis and contributes to structural characterization. The result is especially useful when researchers need to relate observable crystal shape to the organization of faces within a chemical or materials system.
A droplet’s profile on a surface provides a basis for evaluating how a liquid interacts with a solid. The resulting contact angle is used to assess surface wettability, adhesion, and liquid-solid interactions. These properties help distinguish how surfaces behave toward liquids and can guide the study of treated or functional materials.
Crystal-face measurements examine geometric relationships between solid faces, supporting morphological and structural analysis. Contact-angle measurements instead examine the profile of a liquid droplet resting on a solid, revealing wettability, adhesion, and interfacial interactions. Although both use angular information, they describe different systems and answer different chemical or materials questions.
The procedure depends on the instrument design and the target system. Researchers may rotate a calibrated arm to set or determine an angle, align optical components, or analyze the profile of a droplet on a surface. These approaches allow the same general instrument category to address geometric, optical, crystal, and interfacial measurements.
Researchers can measure interfacial angles between crystal faces when they need information about crystal morphology or structure. Those measurements help characterize the geometric form of crystals rather than liquid-solid behavior. In chemistry and materials research, this application supports the analysis of crystalline systems whose face relationships are relevant to their observed shape.
Contact-angle results can evaluate surface wettability, adhesion, and interactions between liquids and solids. This information is relevant when studying surface treatments, developing formulations, or assessing materials used in catalysis and related technologies. The measurements connect an observable droplet profile with interfacial behavior that may influence how a material performs in its intended application.