Asymptotic entanglement capacity of the Ising and anisotropic Heisenberg interactions

We compute the asymptotic entanglement capacity of the Ising interaction ZZ, the anisotropic Heisenberg interaction XX + YY, and more generally, any two-qubit Hamiltonian with canonical form K = a XX + b YY. We also describe an entanglement assisted classical communication protocol using the Hamiltonian K with rate equal to the asymptotic entanglement capacity.Comment: 5 pages, 1 figure; minor corrections, conjecture adde

Identification and verification of frequency-domain models for XV-15 tilt-rotor aircraft dynamics

Frequency-domain methods are used to extract the open-loop dynamics of the XV-15 tilt-rotor aircraft from flight test data for the cruise condition (V = 170 knots). The frequency responses are numerically fitted with transfer-function forms to identify equivalent model characteristics. The associated handling quality parameters meet or exceed Level 2, Category A, requirements for fixed-wing military aircraft. Step response matching is used to verify the time-domain fidelity of the transfer-function models for the cruise and hover flight conditions. The transient responses of the model and aircraft are in close agreement in all cases, except for the normal acceleration response to elevator deflection in cruise. This discrepancy is probably due to the unmodeled rotor rpm dynamics. The utility of the frequency-domain approach for dynamics identification and analysis is clearly demonstrated

New geometries for high spatial resolution hall probes

The Hall response function of symmetric and asymmetric planar Hall effect devices is investigated by scanning a magnetized tip above a sensor surface while simultaneously recording the topography and the Hall voltage. Hall sensor geometries are tailored using a Focused Ion Beam, in standard symmetric and new asymmetric geometries. With this technique we are able to reduce a single voltage probe to a narrow constriction 20 times smaller than the other device dimensions. We show that the response function is peaked above the constriction, in agreement with numerical simulations. The results suggest a new way to pattern Hall sensors for enhanced spatial resolution.Comment: 12 pages, 5 figures, submitted to Journal of Applied Physic

Investigation into Life Enhancement and Positivity – Theoretical and Empirical Studies on Life Satisfaction

Life satisfaction is an important subject for academic and policy attention at individual, societal, and global levels. However, there are longstanding controversies in the research regarding life satisfaction. Confusing use of life satisfaction-related concepts have been identified. Repositioning the concept of life satisfaction and critically reviewing life-related satisfaction studies will clarify these confusions. This analytical commentary presents knowledge on a popular but contested subject, that of life-related satisfaction. This topic is the focus of my selected publications, in which I seek to reconceptualise and reframe the discussion to provide a more comprehensive and meaningful framework for life satisfaction. In addition, I seek to redirect future studies, applications, and policies, ultimately leading to more enabled and resilient societies. Specifically, this analytical commentary illustrates the current state of knowledge, providing an in-depth and systematic evaluation of the current terminologies related to life satisfaction and well-being; and highlights the urgency for change. In this analytical commentary, I seek to consider what authentic life satisfaction is. Based on my selected published works, together with the professional context in which the publications were written, this analytical commentary will focus on and: I. recognise the deficiencies and problems of contemporary understandings and use of relevant terms and concepts; II. make reference to philosophical and psychological thoughts; ix III. review literature within theoretically triangular axes as a frame of reference, namely, life-deep, life-wide, and life-long; and IV. propose a new theoretical framework entitled ‘Life Enhancement and Positivity’ (LEP). Shifting the paradigm, LEP is formulated to be more meaningful, comprehensive, precise, and parsimonious, considering both structures and dynamics of life. Two major structural domains are outlined. Among my published works, I have selected seven peer-reviewed papers that will serve as the body of work for this analytical commentary. Five of the papers were published in internationally recognised journals, and two are articles within two academic reference books published by the University of Hong Kong and Hong Kong Polytechnic University respectively. Under the common theme of life satisfaction, they address different research targets (for example, older and younger cohorts), variables (for example, health-related, psychosocial-related, and work-related) and methods (for example, quantitative and qualitative). These publications, as original contributions to the field, aid the construction of a new meta-level framework that aims to address the aforementioned controversies and ambiguities within the context of a complex and intricate situation as well as to serve as a guide towards a new direction

Study program for encapsulation materials interface for low-cost solar array

The service integrity of the bonded interface in solar cell modules used in solar arrays is addressed. The development of AC impedance as a nondestructive evaluation (NDE) methodology for solar arrays is reported along with development of corrosion models and materials selection criteria for corrosion resistant interfaces

Characterization of silicon nanowire by use of full-vectorial finite element method.

We have carried out a rigorous H-field-based full-vectorial modal analysis and used it to characterize, more accurately, the abrupt dielectric discontinuity of a high index contrast optical waveguide. The full-vectorial H and E fields and the Poynting vector profiles are described in detail. It has been shown through this work that the mode profile of a circular silicon nanowire is not circular and also contains a strong axial field component. The single-mode operation, vector field profiles, modal hybridness, modal ellipticity, and group velocity dispersion of this silicon nanowire are also presented