This study investigated the temporal behavior of grand piano actions from different manufacturers under different touch conditions and dynamic levels. An experimental setup consisting of accelerometers and a calibrated microphone was used to capture key and hammer movements, as well as the sound signal. Five selected keys were played by pianists with two types of touch ("pressed touch" versus "...

NTRU is a very efficient public-key cryptosystem based on polynomial arithmetic. Its security is related to the hardness of lattice problems in a very special class of lattices. This article is motivated by an interesting peculiar property of NTRU lattices. Namely, we show that NTRU lattices are proportional to the so-called symplectic lattices. This suggests to try to adapt the classical reduc...

Delamination is a common failure mechanism in ultra-high molecular weight polyethylene (UHMWPE) tibial inserts [Wright and Rimmnac, 1988]. Changes in polyethylene mechanical properties, such as subsurface embrittlement due to oxidation, may promote crack propagation. The assessment of through-thickness properties may, therefore, provide insight into delamination mechanisms. Using the small punc...

A graph G = (V, E) is called a split graph if there exists a partition V = I ∪K such that the subgraphs G[I ] and G[K] of G induced by I and K are empty and complete graphs, respectively. In 1980, Burkard and Hammer gave a necessary condition for a split graph G with |I | < |K| to be hamiltonian. We will call a split graph G with |I | < |K| satisfying this condition a Burkard-Hammer graph. Furt...

1. Scheby-Buch.-Arch. f. Ophthal., p. 265, 1871. 2. Moll.-Centralbl. f. prakt Augenheilk, p. 2, 1896. 3. Weber.-Virchow's Arch., Vol. XXV, p. 114b, and Vol. XXVIII, p. 489, 1863. % 4. Schmidt-Rimpler.-Klin. Wochenschr., p. 92, 1884. Berlin. 5. Aubertin.-Rev. Gen. d'Ophtal., p. 280, 1933. 6. Lohmann.-Beticht iuber d. Vers. d. Ophthal. Gesellsch., p. 264, 1908. Heidelberg. 7. Stephenson.The Ophth...

Wildfires are widely recognized as a cause of mechanical damage to rocks. Nevertheless, previous research has neglected how wildfires might impact sport climbing areas. In Spain, two large affected areas between 2020 and 2021. This paper addresses the rock effects that could lead safety issues, such falls, hold deterioration, anchor damage. this study, Non-Destructive Techniques (NDTs) Ultrason...

Hammer-throw has a long-standing history in track and field, but unlike some other sports events, men's hammer throw has not seen a new world record since 1986. One of the possible reasons for this stagnation could be the lack of real-time biomechanical feedback training. In this study, we proposed to establish scientifically described training targets and routes, which in turn required tools t...

Vibratory installation of piles and casings can be extremely economical and therefore the contractors’ preferred method of pile driving. Compared to impact pile driving it also has the advantage of reduced noise pollution. Unfortunately, this installation method is still fraught with uncertainties. The foremost question is driveability and equally important is the question of bearing capacity o...