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Design Example: Maintaining Level of an Embankment01:19

Design Example: Maintaining Level of an Embankment

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Constructing a roadway embankment over uneven terrain requires precise leveling to ensure stability and proper drainage. Surveyors use a leveling instrument and staff to calculate ground elevations and determine the required fill material at each point along the embankment alignment.The process begins by positioning a leveling instrument near a benchmark with a known elevation. A backsight reading establishes the instrument height, which serves as a reference for subsequent measurements. A...
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Role of Shaping in Operant Conditioning01:19

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Shaping is a technique used in operant conditioning to train complex behaviors by rewarding successive approximations toward the target behavior. This method is necessary because organisms are unlikely to perform complex behaviors spontaneously. Instead, shaping breaks down the desired behavior into small, manageable steps.
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The concrete is placed as close as possible to its final position to avoid segregation. The placed concrete is then fully compacted to expel the entrapped air, and the next layer of concrete is laid while the underlying layer is still in the plastic state. The rate at which concrete is placed and compacted is kept equal.
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Design Consideration01:22

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Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
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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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Schemas01:42

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A schema is a mental construct consisting of a cluster or collection of related concepts (Bartlett, 1932). There are many different types of schemata, and they all have one thing in common: schemata are a method of organizing information that allows the brain to work more efficiently. When a schema is activated, the brain makes immediate assumptions about the person or object being observed.
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    This study introduces efficient algorithms for the scaffolding problem in next-generation sequencing. We show the problem is solvable in polynomial time on tree graphs and develop an exact algorithm for general graphs.

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    Area of Science:

    • Computational Biology
    • Bioinformatics
    • Graph Theory

    Background:

    • The scaffolding problem is crucial in assembling genomes from next-generation sequencing data.
    • It involves ordering and orienting DNA fragments, often modeled as an optimization problem on scaffold graphs.

    Purpose of the Study:

    • To develop efficient algorithms for solving the scaffolding problem.
    • To analyze the structural properties of scaffold graphs for computational efficiency.

    Main Methods:

    • Developed a dynamic programming algorithm for scaffolding on tree graphs.
    • Utilized tree decomposition to create an exact algorithm for general scaffold graphs.
    • Investigated structural parameters, including feedback-edge sets, for restricted scaffolding versions.

    Main Results:

    • Proved the scaffolding problem is polynomial on tree scaffold graphs.
    • Established a linear-size problem kernel concerning feedback-edge sets for a restricted version.
    • Observed significantly smaller feedback-edge sets in real-world genome scaffold graphs.

    Conclusions:

    • The developed algorithms offer efficient solutions for the scaffolding problem in genomics.
    • Structural analysis of scaffold graphs reveals properties beneficial for computational tractability.
    • Findings suggest practical implications for improving genome assembly accuracy and speed.