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Movement Joints in Buildings01:27

Movement Joints in Buildings

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Movement joints in buildings are essential design elements that accommodate inevitable motions caused by various factors such as temperature changes, moisture content variations, and structural deflections. These motions, if not considered in design and construction, can lead to unsightly or dangerous damage. Movement joints are incorporated in different forms to manage these stresses and allow materials to move without causing distress.
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Appropriate sampling methods ensure that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest.
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After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
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Types of Building Stone01:30

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Building stones, essential materials for construction, are extracted from natural rock deposits and processed into specific forms and dimensions suitable for various building applications. These stones are broadly classified into three types based on their geological formation: igneous, sedimentary, and metamorphic.
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Block Diagram Reduction01:22

Block Diagram Reduction

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The process of deriving the transfer function of a control system often involves reducing its block diagram to a single block. This simplification can be achieved through a series of strategic operations, including relocating branch points and comparators. These operations preserve the overall function of the system while allowing for easier manipulation and combination of blocks.
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Types of Building Separation Joints01:23

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Building separation joints divide large or complex building structures into smaller, discrete units that can move independently. These joints are categorized into three types: volume-change joints, settlement joints, and seismic separation joints.
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Related Experiment Video

Updated: Feb 8, 2026

Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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Thorium Oxo-Clusters as Building Blocks for Open Frameworks.

Clément Falaise1,2, Karoly Kozma1, May Nyman1

  • 1Energy Frontier Research Center, Materials Science of Actinides, Department of Chemistry, Oregon State University, Gilbert Hall, Corvallis, Oregon, 97331, USA.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 12, 2018
PubMed
Summary

Researchers synthesized three novel thorium-sulfate frameworks, revealing key insights into tetravalent actinide chemistry for nuclear fuel cycles and environmental applications. Sulfate ligands play a crucial role in thorium polymerization.

Keywords:
SAXSX-ray diffractionmetal-oxo clustersopen inorganic frameworkssulfatethorium

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Nuclear Chemistry

Background:

  • Fundamental understanding of tetravalent actinide chemistry is critical for nuclear fuel cycle optimization and environmental speciation.
  • Thorium (Th⁴⁺) chemistry, particularly its polymerization and framework formation, is complex and requires further investigation.

Purpose of the Study:

  • To report the synthesis and structural characterization of novel open inorganic frameworks involving Th⁴⁺ and sulfate anions.
  • To elucidate the role of sulfate ligands in thorium polymerization and the formation of oligomeric building units.

Main Methods:

  • Slow evaporation of aqueous Th⁴⁺-SO₄²⁻ solutions with varying molar ratios (1:1, 1.5:1, and 2:1).
  • Single-crystal X-ray diffraction for structural determination of the synthesized compounds.
  • Small-angle X-ray scattering (SAXS) to probe pre-assembly of building units in solution.

Main Results:

  • Three compounds with open inorganic framework architectures were synthesized: [Th₁₀O₄(OH)₈(SO₄)₁₂(H₂O)₁₈]⋅28H₂O (1), [Th₉O₄(OH)₅(SO₄)₁₂(H₂O)₁₈]⋅1TMA⋅18H₂O (2), and [Th₈.₅O₄(OH)₄(SO₄)₁₂(H₂O)₁₈]⋅2TMA⋅nH₂O (3).
  • Framework 1 features interpenetrating networks built from Th₆O₄(OH)₄¹²⁺ hexamers and Th₂ (OH)₂⁶⁺ dimers.
  • Frameworks 2 and 3 exhibit complex anionic structures with varying oligomeric units (hexamers, dimers, monomers) and charge-balancing tetramethylammonium (TMA) cations in 2 and 3.
  • SAXS studies indicated the presence of pre-assembled Th hexamer building units in sulfate-containing solutions, highlighting sulfate's role in thorium polymerization.

Conclusions:

  • The study successfully synthesized and characterized novel Th-sulfate open frameworks, expanding the understanding of tetravalent actinide chemistry.
  • The findings demonstrate the significant influence of sulfate-oxoanion ligands on thorium polymerization processes and the formation of complex inorganic structures.
  • These results are crucial for optimizing nuclear fuel cycles and predicting actinide behavior in environmental contexts.