Internal Vibrator
Internal Vibrator - Related Videos
07:28
Measurement of Bioelectric Current with a Vibrating Probe
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Cited by 15 •
2011
The manufacture, calibration and use of non-invasive vibrating probes to measure bioelectric current in various biological systems is described.
01:19
Vibrating Concrete
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2024
Mechanical vibrators are instrumental in compacting newly poured concrete within formwork and around reinforcements. This process is essential to eliminate trapped air pockets and establish a dense concrete mass. One widely used method is vibrating by internal vibrators, often referred to as a poker vibrator or immersion vibrator. It is rapidly inserted through the full depth of the freshly laid concrete and slightly extends into the layer below it (which remains in a plastic state). Consistent...
09:18
Internal Standards
0 Views •
2023
Source: Laboratory of Dr. B. Jill Venton - University of Virginia The goal of many chemical analyses is a quantitative analysis, where the amount of a substance in a sample is determined. In order to accurately calculate the concentration of an unknown from a sample, careful sample preparation is key. Every time a sample is handled or transferred, some of the sample can be lost. There are strategies however, for minimizing sample loss. There are also strategies for coping with sample loss and...
02:00
Internal Energy
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2020
The total of all possible kinds of energy present in a substance is called the internal energy (U), sometimes symbolized as E. Suppose a system with initial internal energy, Uinitial, undergoes a change in energy (transfer of work or heat), and the final internal energy of the system is Ufinal. Change in internal energy equals the difference between Ufinal and Uinitial. Although the values for Ufinal and Uinitial cannot be determined for a system, the first law of thermodynamics only...
10:13
Hemi-laryngeal Setup for Studying Vocal Fold Vibration in Three Dimensions
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Cited by 12 •
2017
This paper introduces a protocol for the preparation of hemi-larynx specimens facilitating a multi-dimensional view of vocal fold vibration, in order to investigate various biophysical aspects of voice production in humans and non-human mammals.
FAQs
The motor’s eccentric mass converts rotation into rapid oscillation at the vibrating head. Once immersed, that motion temporarily lowers friction between cement paste and aggregate, allowing trapped air to rise while particles settle into a denser arrangement. This internal rearrangement reduces void formation and helps freshly placed concrete develop more uniform contact with reinforcement and formwork.
Lower friction lets the cement paste and aggregate move relative to one another while the concrete is still fresh. The mixture can therefore settle around reinforcement, against the mold, and near embedded components instead of retaining gaps caused by trapped air or uneven particle packing. The resulting contact supports more uniform concrete throughout the placed section.
Vibration must be sufficient to consolidate the mixture without disturbing its uniform composition. Excessive vibration can cause the concrete constituents to separate rather than settle into a consistent arrangement, producing segregation. This is important because the goal is not simply to move the mixture, but to remove voids while preserving a uniform distribution of cement paste and aggregate.
Regular insertion intervals help extend the vibrator’s consolidating action through the placed concrete rather than concentrating it in one location. Gradual withdrawal maintains the effect as the head leaves the mixture and supports improved contact with reinforcement, molds, and embedded components. Together, these handling practices promote more consistent consolidation across the entire section.
Workers immerse the vibrating head at regular intervals within the freshly placed concrete, allow its oscillation to consolidate the surrounding mixture, and withdraw it gradually. This sequence directs vibration through successive regions instead of relying on one insertion point. The procedure is intended to improve contact with reinforcement, molds, and embedded components while limiting the risk of uneven consolidation.
Internal Vibrators are relevant wherever freshly placed concrete must be consolidated within a structural or manufactured element. The overview identifies structural construction, precast manufacturing, and concrete quality control as key settings. In these contexts, the tool supports denser placement and more uniform results, making it useful both during construction and when maintaining consistent production quality.
Proper consolidation can produce stronger, more uniform concrete by reducing trapped-air voids and improving the mixture’s contact with surrounding reinforcement and formwork. Engineers also associate effective use with fewer surface defects. These outcomes make vibration a practical part of concrete quality control, while excessive application must be avoided because it can promote segregation instead of improving the finished material.