Parallelogram ≈ Parallelogram
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External Wrench Estimation, Collision Detection, and Reflex Reaction for Flying Robots Open
Flying in unknown environments may lead to unforeseen collisions, which may cause serious damage to the robot and/or its environment. In this context, fast and robust collision detection combined with safe reaction is, therefore, essential…
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Sensitivity to geometric shape regularity in humans and baboons: A putative signature of human singularity Open
Significance Determining the cognitive differences between human and nonhuman primates is a central goal of cognitive neuroscience. We show that intuitions of geometry are present in humans but absent in baboons. A simple intruder task in …
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Origami mechanical metamaterials based on the Miura-derivative fold patterns Open
This paper presents two new types of origami-inspired mechanical metamaterials based on the Miura-derivative fold patterns that consist of non-identical parallelogram facets. The analytical models to predict dimension changes and deformati…
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Design and Experimental Research of a Novel Stick-Slip Type Piezoelectric Actuator Open
A linear piezoelectric actuator based on the stick-slip principle is presented and tested in this paper. With the help of changeable vertical preload force flexure hinge, the designed linear actuator can achieve both large travel stick-sli…
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Anisotropic permeability in deterministic lateral displacement arrays Open
Inherent array anisotropy causes unintended particle trajectories in a large class of deterministic lateral displacement microfluidic separation devices.
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Conical Kresling origami and its applications to curvature and energy programming Open
Kresling origami has recently been widely used to design mechanical metamaterials, soft robots and smart devices, benefiting from its bistability and compression-twist coupling deformation. However, previous studies mostly focus on the tra…
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Design of a passive, iso-elastic upper limb exoskeleton for gravity compensation Open
An additional mechanical mechanism for a passive parallelogram-based exoskeleton arm-support is presented. It consists of several levers and joints and an attached extension coil spring. The additional mechanism has two favourable features…
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Boundaries for the Honeycomb Code Open
We introduce a simple construction of boundary conditions for the honeycomb code \cite{honeycomb} that uses only pairwise checks and allows parallelogram geometries at the cost of modifying the bulk measurement sequence. We discuss small i…
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The stability stroke of cotton seeder moulder Open
The stability of moulder stroke affects the uniformity compaction of soil ridge. It depends on the mounting system of molder to the frame and the direction of act-ing forces on them. The aim of the study is to analyze the stability stroke …
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Design, Modeling, and Testing of a Novel XY Piezo-Actuated Compliant Micro-Positioning Stage Open
A novel decoupled XY compliant micro-positioning stage, based on a bridge-type amplification mechanism and parallelogram mechanisms, is designed in this paper. Analytical models of the bridge-type amplification mechanism and parallelogram …
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Designing a Mechanical Tool for Robots With Two-Finger Parallel Grippers Open
This work designs a mechanical tool for robots with 2-finger parallel\ngrippers, which extends the function of the robotic gripper without additional\nrequirements on tool exchangers or other actuators. The fundamental kinematic\nstructure…
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Design and Implementation of a Multi-Function Gripper for Grasping General Objects Open
The development of a reliable pick-and-place system for industrial robotics is facing an urgent demand because many manual-labor works, such as piece-picking in warehouses and fulfillment centers tend toward automation. This paper presents…
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On molecular topological properties of benzenoid structures Open
The degree-based topological indices correlate certain physicochemical properties such as boiling point, strain energy, and stability, etc., of certain chemical compounds. Among the major classes of topological indices are the distance-bas…
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On-Surface Synthesis of Dibenzohexacenohexacene and Dibenzopentaphenoheptaphene Open
We report the on-surface synthesis and gas-phase theoretical studies of two novel nanographenes, namely, dibenzohexacenohexacene and dibenzopentaphenoheptaphene, using 8,8′-dibromo-5,5′-bibenzo[rst]pentaphene as a precursor. These nanograp…
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Kinematics, Workspace, and Singularity Analysis of a Parallel Robot With Five Operation Modes Open
Most multimode parallel robots can change operation modes by passing through constraint singularities. This paper deals with a comprehensive kinematic study of a three degrees-of-freedom (DOF) multimode three-PRPiR parallel robot developed…
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Multi-Oriented and Scale-Invariant License Plate Detection Based on Convolutional Neural Networks Open
License plate detection (LPD) is the first and key step in license plate recognition. State-of-the-art object-detection algorithms based on deep learning provide a promising form of LPD. However, there still exist two main challenges. Firs…
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Agustín de Betancourt’s Double-Acting Steam Engine: Geometric Modeling and Virtual Reconstruction Open
In this paper, the geometric modeling and virtual reconstruction of the double-acting steam engine designed by Agustín de Betancourt in 1789 are shown. For this, the software Autodesk Inventor Professional is used, which has allowed us to …
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Kinetostatic Analysis and Actuation Strategy of a Planar Tensegrity 2-X Manipulator Open
A planar tensegrity manipulator made of two X-mechanisms in series is studied in this paper. Contrary to a classical 2-R linkage, the proposed architecture does not contain elements subject to bending and it can be driven with remote actua…
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Design and nonlinear modeling of a novel planar compliant parallelogram mechanism with general tensural-compresural beams Open
The paper proposes a novel type of Compliant Mechanism (CM) called Planar Compliant Parallelogram Mechanism (PCPM) for translational movement by synthesizing 8 compliant beams. Half of the beams are arranged in an inverted way while the ot…
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Kinematic modeling and error analysis of Delta robot considering parallelism error Open
Motion accuracy is an important indicator to evaluate the performance of robots. The driven arm of the Delta robot is composed of a pair of parallelogram mechanisms. Because of the errors in components processing and installation, the para…
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Robust Lane Detection and Tracking Algorithm for Steering Assist Systems Open
Modern vehicles rely on a multitude of sensors and cameras to both understand the environment around them and assist the driver in different situations. Lane detection is an overall process as it can be used in safety systems such as the l…
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A modified pseudo-rigid-body modeling approach for compliant mechanisms with fixed-guided beam flexures Open
In the present paper, we investigate a modified pseudo-rigid-body (MPRB) modeling approach for compliant mechanisms with fixed-guided beam flexures by considering the nonlinear effects of center-shifting and load-stiffening. In particular,…
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Size-Induced Phase Evolution of MoSe<sub>2</sub> Nanoflakes Revealed by Density Functional Theory Open
The control of the relative stability between trigonal prismatic and octahedral structures in transition-metal dichalcogenides (TMDs) is an important step toward technological applications of 2D TMDs materials, where the electronic propert…
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The Eccentricity Version of Atom-Bond Connectivity Index of Linear Polycene Parallelogram Benzenoid ABC5(P(n,n)) Open
Among topological descriptors, connectivity indices are very important and they have a prominent role in chemistry. The atom-bond connectivity index of a connected graph G is defined as ABC(G) = ∑(uv ∈E (G)) √((du + dv - 2)/dudv), where dv…
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Strongly Convex Functions of Higher Order Involving Bifunction Open
Some new concepts of the higher order strongly convex functions involving an arbitrary bifuction are considered in this paper. Some properties of the higher order strongly convex functions are investigated under suitable conditions. Some i…
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Oxidation triggers guest dissociation during reorganization of an FeII4L<sub>6</sub>twisted parallelogram Open
An oxidation-triggered twist in its ferrocene ligands causes an Fe4L6parallelogram to release its guests and collapse into a high spin Fe1L1structure.
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Dual-Band Spiral Printed Quadrifilar Helical Antenna Miniaturized by Surface and Inner Dielectric Loading Open
The design and implementation of a spiral-folded printed quadrifilar helical antenna (FPQHA) is presented for a global positioning system (GPS) L1-/L2-band application. The proposed FPQHA can be miniaturized by inserting dielectric loading…
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Translational upper bound limit analysis of shallow landslides accounting for pore pressure effects Open
Many rainfall-induced landslides are reported to be shallow. Therefore, when regional slope stability analysis, or
\nlandslide hazard mapping is carried out, simple approaches, such as the infinite slope model, are often used.
\nHowever, t…
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Chiral active particles are sensitive reporters to environmental geometry Open
Chiral active particles (CAPs) are self-propelling particles that break time-reversal symmetry by orbiting or spinning, leading to intriguing behaviors. Here, we examined the dynamics of CAPs moving in 2D lattices of disk obstacles through…
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Error modeling and tolerance design of a parallel manipulator with full-circle rotation Open
A method for improving the accuracy of a parallel manipulator with full-circle rotation is systematically investigated in this work via kinematic analysis, error modeling, sensitivity analysis, and tolerance allocation. First, a kinematic …