1 Three Dimensional Gait Analysis Using Wearable Acceleration and Gyro Sensors Based on Quaternion Calculations

2 Constrained Quaternion-Variable Convex Optimization: A Quaternion-Valued Recurrent Neural Network Approach.

3 Delay-dependent stability analysis of the QUAD vector field fractional order quaternion-valued memristive uncertain neutral type leaky integrator echo state neural networks.

4 Novel bifurcation results for a delayed fractional-order quaternion-valued neural network.

5 Quaternion-Based Robust Attitude Estimation Using an Adaptive Unscented Kalman Filter.

6 Quaternion algebra for Stokes-Mueller formalism.

7 Passivity Analysis for Quaternion-Valued Memristor-Based Neural Networks With Time-Varying Delay.

8 Fixed-time synchronization of quaternion-valued memristive neural networks with time delays.

9 Kalman Filtering for Attitude Estimation with Quaternions and Concepts from Manifold Theory.

10 Steady-state performance analysis of quaternion-valued least mean square adaptive algorithm

11 Stability and stabilization of quaternion-valued neural networks with uncertain time-delayed impulses: Direct quaternion method

12 Quaternion weighted spherical Bessel-Fourier moment and its invariant for color image reconstruction and object recognition

13 Operation mode analysis of lower-mobility parallel mechanisms based on dual quaternions

14 LMI conditions for some dynamical behaviors of fractional-order quaternion-valued neural networks

15 Quasi-state estimation and quasi-synchronization control of quaternion-valued fractional-order fuzzy memristive neural networks: Vector ordering approach

16 Limits of generalized quaternion groups

17 Parameter-range-dependent robust stability conditions for quaternion-valued neural networks with time delays

18 Periodic solutions for quaternion-valued fuzzy cellular neural networks with time-varying delays

19 Efficient copyright protection for three CT images based on quaternion polar harmonic Fourier moments

20 Quaternion orders and sphere packings

21 Quaternion Signal Analysis Algorithm for Induction Motor Fault Detection

22 Delay independent robust stability analysis of delayed fractional quaternion-valued leaky integrator echo state neural networks with QUAD condition

23 The quaternion minimum error entropy algorithm with fiducial point for nonlinear adaptive systems

24 Exponential input-to-state stability of quaternion-valued neural networks with time delay

25 Rotations, Transformations, Left Quaternions, Right Quaternions?

26 CHAIN EQUIVALENCE ON QUATERNIONS WITH TRIVIAL SUM

27 Consistency of Split Quaternion Matrix Equations AX<sup>⋆</sup>- XB= CY+ D and X- AX<sup>⋆</sup>B= CY+ D

28 Insertion loss analysis of slender beams with periodic curvatures using quaternion-based parametrization, FE method and wave propagation approach

29 Quaternion distinguished representations and unstable base change for unitary groups

30 Splitting quaternion algebras over quadratic number fields

31 Quaternion Harmonic moments and extreme learning machine for color object recognition

32 Involutions on tensor products of quaternion algebras

33 QUATERNION VALUED FUNCTION OF A REAL VARIABLE SERRET-FRENET FORMULAE

34 Fully Quaternion-Valued Adaptive Beamforming Based on Crossed-Dipole Arrays

35 The Regularity of Functions on Dual Split Quaternions in Clifford Analysis

36 The Number of Symmetric Colorings of the Quaternion Group

37 Quaternion based generalization of Chern–Simons theories in arbitrary dimensions

38 Some New Properties of The Real Quaternion Matrices and Matlab Applications

39 Quantum theory in quaternionic Hilbert space: How Poincaré symmetry reduces the theory to the standard complex one

40 On the Weak Topology of Quaternionic Hilbert Spaces

41 Weyl and Browder S-spectra in a right quaternionic Hilbert space

42 The Correct Formulation of Gleason’s Theorem in Quaternionic Hilbert Spaces

43 Quaternionic continuous wavelet transform on a quaternionic Hilbert space

44 Duals of a frame in quaternionic Hilbert spaces

45 Quaternionic operators on a hilbert space

46 Canonical, squeezed and fermionic coherent states in a right quaternionic Hilbert space with a left multiplication on it

47 Spectral representations of normal operators in quaternionic Hilbert spaces via intertwining quaternionic PVMs

48 General construction of reproducing kernels on a quaternionic Hilbert space

49 Positive compact operators on quaternionic hilbert spaces

50 On the polar decomposition of right linear operators in quaternionic Hilbert spaces

51 S-spectrum and associated continuous frames on quaternionic Hilbert spaces

52 Slice functional calculus in quaternionic Hilbert spaces

53 Geometry and operator theory on quaternionic hilbert spaces

54 The quaternionic affine group and related continuous wavelet transforms on complex and quaternionic Hilbert spaces

55 Continuous slice functional calculus in quaternionic hilbert spaces

56 Quaternionic Quantum Dynamics on Complex Hilbert Spaces

57 Regular subspaces of a quaternionic Hilbert space from quaternionic Hermite polynomials and associated coherent states

58 Quaternionic Hilbert spaces and a von Neumann inequality

59 Diagonalization of Bounded Linear Operators on Separable Quaternionic Hilbert Space

60 Coherent states and Hermite polynomials on quaternionic Hilbert spaces

61 OnEuclideanalgebraofhermitianoperators on a quaternionic Hilbert space

62 Comments on a recent paper by S. Adler on projective group representations in quaternionic Hilbert spaces

63 Response to the comment by G. Emch on projective group representations in quaternionic Hilbert space

64 Quaternions and Functional Calculus

65 The Quaternionic Hardy Space and the Geometry of the Unit Ball

66 Infrared Image Super-Resolution Reconstruction Based on Quaternion and High-Order Overlapping Group Sparse Total Variation.

67 Multistability Analysis of Quaternion-Valued Neural Networks With Time Delays.

68 Quaternionic Monge–Ampère operator for unbounded plurisubharmonic functions

69 normal anti-invariant submanifolds of paraquaternionic kähler manifolds

70 quaternion cr-submanifolds of a quaternion kaehler manifold

71 anti-periodic dynamics of quaternion-valued fuzzy cellular neural networks with time-varying delays on time scales

72 on two-dimensional quaternion wigner-ville distribution

73 iterative algorithm for solving a class of quaternion matrix equation over the generalized (p,q)-reflexive matrices

74 kaluza-klein-carmeli metric from quaternion-clifford space, lorentz' force, and some observables

75 adaptive beamforming based on complex quaternion processes

76 a new grid deformation technology with high quality and robustness based on quaternion

77 template matching of colored image based on quaternion fourier transform and image pyramid techniques

78 quaternions: sucessos e insucessos de um projeto de pesquisa

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