Here, we present the design, fabrication, and evaluation of a prismatic-revolute-revolute joint hand called the model B that we developed for grasping from ungrounded vehicles. This hand relies on a prismatic proximal joint followed by revolute distal joints in each finger and is actuated by a single motorand a tendon-based underactuated transmission. We evaluate this design’s grasping capabili...

The asymmetric unit of the title coordination polymer, {[La(2)(C(8)H(4)O(4))(3)(H(2)O)]·0.5H(2)O}(n), contains two independent La(III) atoms, one of which is surrounded by eight carboxyl-ate-O atoms from six benzene-1,2-dicarboxyl-ate (BDC) anions in a bicapped trigonal-prismatic geometry. The other La(III) atom is nine-coordinated in a tricapped trigonal-prismatic geometry, formed by eight car...

The shell wall in Spirula is composed of prismatic layers, whereas the septa consist of lamello-fibrillar nacre. The septal neck is holochoanitic and consists of two calcareous layers: the outer lamello-fibrillar nacreous layer that continues from the septum, and the inner pillar layer that covers the inner surface of the septal neck. The pillar layer probably is a structurally modified simple ...

Flexural fatigue tests are typically run under displacement or in a straincontrolled mode. In these tests, either the oscillatory displacement amplitude or strain amplitude applied to the bottom of the specimen is kept constant. The evolution of loading required to cause fatigue is then measured. Load amplitude decreases with the number of cycles, and the specimen is considered to have failed w...

In order to investigate the influence of the stiffness of the compliant prismatic pair, a planar four-bar parallelogram, in a fully compliant parallel mechanism, the stiffness model of the passive compliant prismatic pair in a compliant parallel positioning stage is established using the compliant matrix method and matrix transformation. The influences of the constraints and the compliance of t...

In order to investigate the influence of the stiffness of the compliant prismatic pair, a planar four-bar parallelogram, in a fully compliant parallel mechanism, the stiffness model of the passive compliant prismatic pair in a compliant parallel positioning stage is established using the compliant matrix method and matrix transformation. The influences of the constraints and the compliance of t...

A control system for a piezoelectric beam actuator, which had one or two inputs, was subject of numerical and laboratory research. The actuator prismatic shape with rectangular cross-section consisted layer carrying substrate made from PCB-FR4 patches Macro Fiber Composite P1 type. MFC were glued on both sides the substrate. An article presents comparison quality signal (one-input actuator) sig...

In this article, we use the first-order virtual element method (VEM) to investigate effect of shape quality polyhedra in estimation critical time step for explicit three-dimensional elastodynamic finite (FE) simulations. Low-quality FEs are common when meshing realistic complex components, and while tetrahedral technology is generally robust, algorithms cannot guarantee high-quality meshes arbi...

A spherical parallel manipulator (also called an orientational parallel manipulator or rotational parallel manipulator) refers to a threedegree-of-freedom (3-DoF) parallel manipulator in which the moving platform undergoes a 3-DoF spherical motion or rotates about a fixed point. In this paper, we propose a new method for the type synthesis of non-overconstrained (isostatic) spherical parallel m...