Macro-Modelling of Rib-Knitted Tubular Parts

The aim of the research was to improve the process of knitted products design. The use of modern software helps us predict the physical and mechanical behaviour of materials, using their three-dimensional models. A macro-model of rib-knitted tubular parts was developed in the study. This model allows its implementation into algorithms, describing the peculiarities of the stretching process. Recent findings in the field of 3D modelling and simulation of knitwear behaviour aim at working with models of different scales of structural hierarchy. The use of macro-models provides the opportunity to simplify the geometry and significantly reduce the time required for simulation. Rib stitch structures are among the most popular weft-knitted ones. When using threads of usual stretchability (with breaking elongation that does not exceed 10–12%), the stretchability of some rib stitch structures in the course-wise direction can reach up to 350% and even more. When stretched in the course direction, rib-knitted stitches undergo a number of stages. The stretching process includes: decreasing the width-wise curling; mutual shifting of knit and purl stitches; reducing the curvature of the loop feet and loop heads; pulling the yarn from the loop legs to the loop feet; stretching of the yarn. The assumption was made that such parts of knitted garments as cuffs and borders on sweaters, cuffs on socks, where rib stitch patterns are used, can be described as thin-walled elastic shells. A part of a human body surface, covered with a rib-knitted garment part, can be approximated by a truncated cone. The mid-surface of the shell can be represented as a ruled surface created upon a set of Bezier curves, located along the circumference of the upper and lower bases of the truncated cone. The mathematical description, elaborated in the course of the research, was used for the computer program LastikTube, which was developed to create 3D macro-models of ribbed tubular garments.

Methods to Generate Structurally Hierarchical Architectures in Nanoporous Coinage Metals

The fundamental essence of material design towards creating functional materials lies in bringing together the competing aspects of a large specific surface area and rapid transport pathways. The generation of structural hierarchy on distinct and well-defined length scales has successfully solved many problems in porous materials. Important applications of these hierarchical materials in the fields of catalysis and electrochemistry are briefly discussed. This review summarizes the recent advances in the strategies to create a hierarchical bicontinuous morphology in porous metals, focusing mainly on the hierarchical architectures in nanoporous gold. Starting from the traditional dealloying method and subsequently moving to other non-traditional top-down and bottom-up manufacturing processes including templating, 3D printing, and electrodeposition, this review will thoroughly examine the chemistry of creating hierarchical nanoporous gold and other coinage metals. Finally, we conclude with a discussion about the future opportunities for the advancement in the methodologies to create bimodal structures with enhanced sensitivity.

The Inheritance and Development of Dunhuang Dance to the Musical Dance Art of Dunhuang Frescoes

Dunhuang frescoes carry the essence of millennia of civilization and are rich in historical and scientific value. In the continuous progress of history, the artistic styles of different eras have merged, and finally formed the very charming Dunhuang musical dance art, which has been widely welcomed. Under the background of the information age, people integrate digital technology with the Dunhuang fresco art of musical dance, which not only improves the preservation time of Dunhuang frescoes, but also allows this art to be presented to people and allows Dunhuang culture to be spread and inherited. The elements in the Dunhuang frescoes in our country are very rich and can be applied to all aspects. Many professionals have gradually realized its importance, and by transforming its creative vehicle, users can deeply understand and further appreciate the Dunhuang musical dance art and learn the knowledge of frescoes while experiencing the product. At the same time, based on the existing frescoes and restoration drawings created by researchers, combined with the special design principles of the product, a visual interface with a sense of structural hierarchy was designed. The classic Dunhuang fresco musical dance images are sorted out to build a rich material information database. At the same time, the interactive display is divided into different modules according to the research content of Dunhuang fresco musical dance art, and the content of the characteristics of the times, music meaning and dancing image are designed. Finally, Unity3D is used to realize the interactive display design of Dunhuang fresco musical dance art.

A modular design method based on TRIZ and AD and its application to cutter changing robot

Modular design, Axiomatic design (AD) and Theory of inventive problem solving (TRIZ) have been increasingly popularized in concept design of modern mechanical product. Each method has their own advantages and drawbacks. The benefit of modular design is reducing the product design period, and AD has the capability of problem analysis, while TRIZ’s expertise is innovative idea generation. According to the complementarity of these three approaches, an innovative and systematic methodology is proposed to design big complex mechanical system. Firstly, the module partition is executed based on scenario decomposition. Then, the behavior attributes of modules are listed to find the design contradiction, including motion form, spatial constraints, and performance requirements. TRIZ tools are employed to deal with the contradictions between behavior attributes. The decomposition and mapping of functional requirements and design parameters are carried out to construct the structural hierarchy of each module. Then, modules are integrated considering the connections between each other. Finally, the operation steps in application scenario are designed in temporal and spatial dimensions. Design of cutter changing robot for shield tunneling machine is taken as an example to validate the feasibility and effectiveness of the proposed method.

Biomaterials with structural hierarchy and controlled 3D nanotopography guide endogenous bone regeneration

Biomaterials without exogenous cells or therapeutic agents often fail to achieve rapid endogenous bone regeneration with high quality. Here, we reported a class of three-dimensional (3D) nanofiber scaffolds with hierarchical structure and controlled alignment for effective endogenous cranial bone regeneration. 3D scaffolds consisting of radially aligned nanofibers guided and promoted the migration of bone marrow stem cells from the surrounding region to the center in vitro. These scaffolds showed the highest new bone volume, surface coverage, and mineral density among the tested groups in vivo. The regenerated bone exhibited a radially aligned fashion, closely recapitulating the scaffold’s architecture. The organic phase in regenerated bone showed an aligned, layered, and densely packed structure, while the inorganic mineral phase showed a uniform distribution with smaller pore size and an even distribution of stress upon the simulated compression. We expect that this study will inspire the design of next-generation biomaterials for effective endogenous bone regeneration with desired quality.

O strukturze świata w narracyjnych grach wideo

The article On the structure of gameworld in narrative video games proposes to introduce the term ‘ludotopia’ to Polish game studies in order to further compartmentalise the structure of video gameworld. Having reflected on the consequences of so-called world-centered turn in contemporary digital humanities, the author proceeds to defining archetypal structures that compose realities designed for the purposes of narrative video games, namely: locations and clusters of locations, the latter divided further into biomes and anthromes. The hierarchy introduced thereby is presented as an alternative for already influential (though, arguably, in transmedial world-building studies rather than game studies) trichotomy of mythos, topos, and ethos, as defined by Lisbeth Klastrup and Susana Tosca. In the end, the article cross-references the new structural hierarchy of ludotopographical components with a matrix of popular fantastic settings, seeking to delineate possible similarities between ludotopias and allotopias that would inform both game scholars and game designers on the ways of rapid prototyping of aesthetically diverse imaginary worlds.