focalinterest.net

Tag: Manufacturing & Industrial Engineering

  • Chirality affects microcritical states in a periodic lattice

    What the study found

    The study found that, in a periodic lattice with generic rigid finite size joints, chirality affects only the micro critical state and not the macro critical state. It also found that geometric parameters of the rigid element can be chosen to tailor a wide range of critical modes for different macro-stress states.

    Why the authors say this matters

    The authors suggest that careful geometric design of the rigid element can be used to activate micro critical modes before macro ones. The findings indicate a way to tailor critical behavior in this metamaterial, a material engineered to have properties not usually found in natural materials.

    What the researchers tested

    The researchers studied a metamaterial modeled as a grid of shear-deformable beams connected by rigid elements. They applied Bloch-Floquet theory, a method for analyzing repeating structures, to derive a closed-form solution for the stability domain and the related critical modes.

    What worked and what didn't

    The analysis produced a closed-form solution for the stability domain and critical modes. By adjusting the geometry of the rigid element, the authors report that many critical modes can be tailored for different macro-stress states, but chirality was said to influence only the micro critical state, not the macro one.

    What to keep in mind

    The summary does not describe experimental validation or numerical testing. It also does not state broader limits beyond the specific lattice model with generic rigid finite size joints.

    • A periodic lattice with generic rigid finite size joints was analyzed as a metamaterial.
    • Bloch-Floquet theory was used to derive a closed-form stability domain and critical modes.
    • Geometric choices for the rigid element can tailor a wide range of critical modes.
    • Chirality affects the micro critical state but not the macro critical state.
    • The authors say micro critical modes can be activated before macro ones.

  • Review compares academic and commercial liver-on-a-chip models

    What the study found

    The review found that liver-on-a-chip models have advanced and are being used in both academic and commercial settings. The authors compare different designs, cellular compositions, and levels of complexity across these models.

    Why the authors say this matters

    The authors say advanced liver-on-a-chip models could be useful in preclinical workflows. They suggest these models have the potential to decrease research and development expenses and reduce or even replace animal testing, while improving the safety and efficacy of new therapies.

    What the researchers tested

    This is a review article rather than a new experimental study. The authors surveyed recent academic and commercial liver-on-a-chip models, examined their designs and cellular compositions, and performed a systematic comparison of the models.

    What worked and what didn't

    The review states that liver-on-a-chip technology has proven useful in drug development and in more advanced applications. It also discusses the advantages and disadvantages of different model complexities, along with their current challenges and future perspectives.

    What to keep in mind

    The abstract does not provide specific experimental results from a single model, and it does not name detailed limitations for the reviewed platforms. The paper is a summary and comparison of existing models, so its conclusions depend on the studies and products it reviewed.

    • The paper reviews recent academic and commercial liver-on-a-chip models.
    • It compares model designs, cellular compositions, and complexity.
    • The authors say these models may help reduce R&D costs and animal testing.
    • The review describes both advantages and disadvantages of model complexity.
    • It also discusses current challenges and future perspectives in the field.