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Retarders

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Retarders are chemical admixtures designed to extend the setting time, which is especially useful when there is a delay in sequential concrete pours to prevent cold joints and to achieve a cohesive structure. Retarders, when used in appropriate amounts, can also enhance the architectural appearance of exposed aggregate finishes.
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Mixing Time01:19

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The concept of mixing time is significant in producing a uniform concrete mix with the required strength. The mixing period starts once all components are in the mixer. Initially, the mixer is charged with 10% of the water, followed by the consistent addition of solids and then 80% of the water. The remaining water is added later, within the first quarter of the mixing period. The minimum mixing time varies according to the mixer's capacity; for example, mixers with up to 1 cubic yard...
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Forgetting is a complex cognitive phenomenon influenced by several factors, among which interference and decay are particularly prominent. These processes explain why individuals often struggle to retrieve specific information from memory, leading to lapses in recall that can be observed in everyday situations.
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Voltage Doubler Circuit01:23

Voltage Doubler Circuit

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A voltage doubler circuit integrates two main components: a clamping section and a rectifier section. The clamping section consists of a capacitor (C1) and a diode (D1), whereas the rectifier section is equipped with another diode (D2) and capacitor (C2). This circuit produces an output voltage with twice the amplitude of the sinusoidal input voltage.
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The setting time of cement refers to the process of cement paste transitioning from a plastic state to a solid state. This process is crucial in construction as it dictates the timeframe for concrete placement, compaction, and finishing. The onset of this solidification is termed the initial set, indicating when the paste becomes unworkable. The final set is when the paste has solidified completely, and further handling or manipulation can no longer affect its shape. The cement strength is...
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Updated: Mar 18, 2026

Trans-vivo Delayed Type Hypersensitivity Assay for Antigen Specific Regulation
11:49

Trans-vivo Delayed Type Hypersensitivity Assay for Antigen Specific Regulation

Published on: May 2, 2013

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Viva Delay.

Hossein Yahaghi1, Shahryar Sorooshian2, Javad Yahaghi3

  • 1Faculty of Humanities, Sari Branch, Islamic Azad University, Sari, Mazandaran, Iran.

Science and Engineering Ethics
|June 29, 2016
PubMed
Summary
This summary is machine-generated.

Thesis submission to Viva Voce delays are a significant issue for students. Selecting the appropriate examiner can effectively reduce this prolonged waiting period.

Keywords:
ExaminerGraduation delayStudy pressuresViva Voce

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Area of Science:

  • Higher Education
  • Academic Administration

Background:

  • Students face considerable, often intolerable, delays between thesis submission and their final oral examination (Viva Voce).
  • This extended waiting period can negatively impact student progression and well-being.

Discussion:

  • The selection process for Viva Voce examiners is a critical factor influencing the duration of thesis defense scheduling.
  • Strategic and timely appointment of qualified examiners is essential for efficient academic progression.

Key Insights:

  • Choosing the right examiner is paramount in mitigating delays in the thesis examination process.
  • Proactive examiner selection can streamline the path to the Viva Voce, benefiting students.

Outlook:

  • Implementing optimized examiner selection protocols can enhance the overall efficiency of postgraduate academic timelines.
  • Future research could explore best practices in examiner nomination and appointment to further reduce administrative bottlenecks.