Abstract Let $\mathsf {C}$ be a symmetrisable generalised Cartan matrix. We introduce four different versions of double Bott–Samelson cells for every pair positive braids in the braid group associated to . prove that decorated are smooth affine varieties, whose coordinate rings naturally isomorphic upper cluster algebras. explicitly describe Donaldson–Thomas transformations on and they transfor...

The paper considers the active control of harmonic and random sound transmitted through a double-leaf partition using a single distributed actuator and a single distributed sensor. The double-leaf partition consists of a pair of small plates (300x380 mm, separated by a 100 mm air-gap,). An actuator made up of shaped, distributed PVDF offers the possibility of cent rolling the volume velocity of...

BACKGROUND AND PURPOSE A CT scanner employing a digital flat-panel detector is capable of very high spatial resolution as compared with a multi-section CT (MSCT) scanner. Our purpose was to determine how well a prototypical volume CT (VCT) scanner with a flat-panel detector system defines fine structures in temporal bone. METHODS Four partially manipulated temporal-bone specimens were imaged ...

This study conducts numerical analyses on a newly developed double-layer steel-lightweight high ductility cement composite (LHDCC)-steel sandwich panel under concentrated punching load. Energy absorption ability serves as an important criterion in evaluating the performance of protective structures. One critical factor related to energy is stiffness or deformation capacity structure. The presen...

In recent years, metamaterial-structures and Microperforated panel (MPP) absorbers have been proposed as a valid alternative to porous materials for sound absorption in the low frequency range. However, high broadband cannot be achieved range required some engineering applications where large thicknesses of are unsuitable. this work, deep subwavelength hybrid parallel-arranged MPP Archimedean-i...

Technological innovation is closely related to the green total factor productivity (GTFP), which has played an important role in China’s sustainable development goals. However, relationship between technological and GTFP may change due influence of economic factors such as service-oriented upgrading industrial structure. This study used a panel dual-threshold regression model perform empirical ...

Composite structures are often used in aircraft because of the advantages offered by a high strength to weight ratio. However, the acoustical properties of these light and stiff structures can often be less than desirable resulting in high aircraft interior noise levels. In this paper, measurements and predictions of the transmission loss of a curved honeycomb composite panel are presented. The...