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Related Concept Videos

Survey Safety01:28

Survey Safety

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Surveying near highways, rough terrain, or power lines involves significant risks. Working along highways is particularly dangerous and requires the use of warning signs and flagmen. It is safest to avoid working directly on roads and use offsets whenever possible. When highway work is unavoidable, it must follow all safety guidelines. Surveyors should wear bright clothing, such as orange reflective vests, to ensure visibility to motorists, coworkers, and hunters. In construction zones, wearing...
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Differential Leveling01:12

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Differential leveling is a precise method in surveying used to determine the elevation difference between two points. Its primary goal is to establish accurate vertical measurements to create level surfaces or grade lines critical for designing and constructing infrastructures such as roads, bridges, and buildings.The procedure for differential leveling begins with setting up and leveling the instrument at a point where the benchmark can be seen. The level rod is held on the benchmark (BM), and...
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Profile leveling and cross-sections are surveying methods used to determine and document terrain elevations for infrastructure projects such as highways, railroads, canals, and pipelines. These methods provide data for earthwork planning and alignment of proposed routes.  Profile leveling involves measuring elevations along a fixed line to create a vertical terrain profile. A surveyor sets up a leveling instrument at the benchmark (BM) and records a backsight (BS) to determine the...
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Design Example: Managing Concrete Workability01:14

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This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
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Quarrying of Stone01:15

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Quarrying is the process of extracting stone from a quarry, where specialized techniques are employed to remove large blocks of stone safely and efficiently. This process can involve controlled explosions or more precision-oriented methods such as cutting and drilling.
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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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Buildings operations and ETS exposure.

J D Spengler1

  • 1Department of Environmental Health, Havard School of Public Health, Boston, Massachusetts 02115-6021, USA. jspengle@hsph.harvard.edu

Environmental Health Perspectives
|June 22, 1999
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Summary
This summary is machine-generated.

Building ventilation systems impact worker exposure to environmental tobacco smoke (ETS). Understanding heating, ventilating, and air conditioning (HVAC) operations is crucial for modeling and controlling ETS exposure in workplaces.

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Area of Science:

  • Building science
  • Occupational health
  • Environmental engineering

Background:

  • Mechanical systems, including HVAC, are integral to building operations, influencing air quality.
  • Building ventilation systems play a critical role in managing thermal loads and diluting airborne contaminants.
  • Worker exposure to environmental tobacco smoke (ETS) is a significant occupational health concern.

Purpose of the Study:

  • To review the general features of building ventilation systems.
  • To evaluate the efficacy of ventilation in controlling contaminant concentrations, specifically ETS.
  • To highlight the implications of HVAC system characteristics on worker ETS exposure.

Main Methods:

  • Literature review of building ventilation systems and their operational characteristics.
  • Analysis of ventilation's role in contaminant dilution and transport.
  • Examination of HVAC system functions related to air distribution and contamination control.

Main Results:

  • Ventilation can reduce ETS concentrations through dilution.
  • HVAC systems can inadvertently distribute ETS-contaminated air throughout buildings.
  • Understanding HVAC operational dynamics is essential for accurate exposure modeling.

Conclusions:

  • Effective control of worker ETS exposure requires a thorough understanding of building ventilation and HVAC system operations.
  • HVAC system design and function significantly influence the distribution and concentration of ETS.
  • Further research into HVAC-specific exposure modeling is needed to protect worker health.