Fast arm movements involving the shoulder and elbow joints have been analysed in normal controls patients with Parkinson9s disease. The subjects were requested to draw on a graphic tablet triangles squares of different size shape. produced larger number EMG burst compared controls. accurate, each segment geometric figures was performed roughly straight trajectory, but time necessary trace pauses at vertices prolonged. We conclude that disease disability generating two joint ballistic depends...

Heads of ant workers harbour the mouthparts and respective musculature, varying drastically in morphology. The mandible adductor muscles occupy most head's internal volume, their contraction generates forces that could risk cuticle failure. Here we quantified worker plane head shape disparity explored how it influences stress dissipation under biting conditions. We combined a geometric morphometric approach phylogenetic comparative framework biomechanical simulations to test hypothesis...

Ants show remarkable ecological and evolutionary success due to their social life history division of labour among colony members. In some lineages, the worker force became subdivided into morphologically distinct individuals (i.e. minor versus major workers), allowing for differential performance particular roles in colony. However, functional significance these morphological differences are not well understood. Here, we applied finite element analysis (FEA) explore biomechanical between...

Insects evolved various modifications to their mouthparts, allowing for a broad exploration of feeding modes. In ants, workers perform non-reproductive tasks like excavation, food processing, and juvenile care, relying heavily on mandibles. Given the importance biting ant significant mandible morphological diversity across species, it is essential understand how shape influences its mechanical responses bite loading. We employed Finite Element Analysis simulate scenarios volumetric models...

Food processing can exert significant evolutionary pressures on the morphological evolution of animal appendages. The ant genus

In orthodontic treatment, intrusion movement of maxillary incisors is often necessary. Therefore, the objective this investigation to evaluate initial distribution patterns and magnitude compressive stress in periodontal ligament (PDL) a simulation incisors, considering points force application.Anatomic 3D models reconstructed from cone-beam computed tomography scans were used simulate loading. The application selected were: centered between central brackets (LOAD 1); bilaterally lateral 2);...

This study aimed to simulate the actions of low-pull (LP), high-pull (HP), and combined pull (CP) headgears (HGs) analyze tooth movement tendencies through finite element analysis. Tomographic slices a human maxilla with complete permanent dentition were processed by reconstruction software, triangular surface mesh was converted into non-uniform rational B-spline (NURBS) curves. An HG facial bow also modulated in 3D. The teeth bone considered have isotropic linear behavior, whereas...

The aim of the present work was to evaluate stress magnitudes and directions along midpalatal suture in maxillary protraction therapy.The geometry maxilla teeth were digitally reconstructed based on computer tomography images obtained from skull a girl mixed dentition stage with skeletal dental class III malocclusion. An appliance commonly used for rapid palatal expansion (RPE) also modeled anchorage force meshed finite element analysis. simulated applying 600 cN (300 each side) directed 30°...

Abstract The axial compressive strength of cementitious compounds is an important parameter for classification, quality assessment and material design. values obtained in tests are influenced due intrinsic properties the external factors such specimen size shape. present work aims to evaluate experimentally numerically using finite element method, shape dimension influence over results mortar test. geometry aspects cubic, (4x4x4) cm, column with height/thickness ratio equals two prismatic,...

Abstract The remarkable ecological and evolutionary success of ants was associated with the evolution reproductive division labor, in which sterile workers perform most colony tasks whereas reproductives become specialized reproduction. In some lineages, worker force became further subdivided into morphologically distinct subcastes (e.g. minor vs. major workers), allowing for differential performance particular roles colony. However, functional significance morphological differences between...

trans-Dihydrolisuride, a partial dopamine receptor agonist, was tested for its effects on chorea in double-blind, crossover clinical study 10 patients with Huntington's disease. In eight patients, neurophysiological evaluation also performed. No reduction choreic movements or improvement voluntary movement performance observed. However, some there slight patients' alertness and of the reaction time.

This study aimed to characterize some technological properties of Eucalyptus grandis wood and evaluate the use Digital Image Correlation (DIC) obtain displacement behavior samples in deformation its relationship with tension tensile compression tests parallel fibers. Samples were produced from 23-year-old determine basic density, shrinkage coefficient, anisotropy contraction swelling, mechanical strength To calculate Modulus Elasticity (E), stress wave velocity was measured samples. The...

Abstract: Various methods in the literature proposesequations to calculate thestiffness as a function of density bone tissue such apparent and ashdensity among others[Helgason, Perilli, Schileo, Taddei, Brynjolfsson Vice-conti, 2008]. Other ones present value an equivalent elasticity modulus, ob-tained by statistical adjustments curves generated through mechanical compres-sion tests over various specimens[Chevalier, Pahr, Allmer, Charlebois Zysset,2007; Cuppone, Seedhom, Berry Ostell, 2004]....

O método lattice Boltzmann (LBM) foi proposto na década de 1980, fundamentado num modelo gas com a discretização da equação transporte Boltzmann. Esse tem sido utilizado para retratar o fluxo sanguíneo pela possibilidade simular computacionalmente dinâmica fluidos regida pelas equações Navier-Stokes, conseguindo representar desde geometrias complexas até fluxos turbulentos e multifásicos. Com necessidade criar bons modelos físicos matemáticos sistema cardiovascular humano (HCVS) é preciso...

Objetivo: O objetivo desse estudo foi avaliar e comparar as propriedades mecânicas dos cimentos resinosos duais convencionais autoadesivos em macro nanoescala. Métodos: Foram confeccionados 15 espécimes de cada marca resinosos, AllCem (FGM), RelyX ARC (3M/ESPE) U200 (3M/ESPE), para teste realizado (flexão três pontos, compressão nanoindentação) acordo com instruções fabricantes. Os foram fotoativados aparelho Optilux Demetron (Kerr) por 40 segundos armazenados frascos escuros a 37ºC 24...

Considerando um material bifásico isotrópico (inclusão e matriz), o intuito deste trabalho é analisar comportamento a geometria de inclusões em corpo. Esta estimativa se fará partir da localização inclusão na matriz, iniciando com uma centralizada aproximando-a condição contorno. hipótese será testada entre estrutura homogeneizada outra matriz explícitas. Para que isso ocorra, faz-se uso do método homogeneização Mori-Tanaka, afim obter tensor constitutivo efetivo para sólido isotrópico....