A dynamics-driven approach to precision machines design for micro-manufacturing and its implementation perspectives

Precision machines are essential elements in fabricating high quality micro products or micro features and directly affect the machining accuracy, repeatability and efficiency. There are a number of literatures on the design of industrial machine elements and a couple of precision machines commercially available. However, few researchers have systematically addressed the design of precision machines from the dynamics point of view. In this paper, the design issues of precision machines are presented with particular emphasis on the dynamics aspects as the major factors affecting the performance of the precision machines and machining processes. This paper begins with a brief review of the design principles of precision machines with emphasis on machining dynamics. Then design processes of precision machines are discussed, and followed by a practical modelling and simulation approaches. Two case studies are provided including the design and analysis of a fast tool servo system and a 5-axis bench-top micro-milling machine respectively. The design and analysis used in the two case studies are formulated based on the design methodology and guidelines

Domain Growth in Ising Systems with Quenched Disorder

We present results from extensive Monte Carlo (MC) simulations of domain growth in ferromagnets and binary mixtures with quenched disorder. These are modeled by the "random-bond Ising model" and the "dilute Ising model" with either nonconserved (Glauber) spin-flip kinetics or conserved (Kawasaki) spin-exchange kinetics. In all cases, our MC results are consistent with power-law growth with an exponent $\theta (T,\epsilon)$ which depends on the quench temperature $T$ and the disorder amplitude $\epsilon$. Such exponents arise naturally when the coarsening domains are trapped by energy barriers which grow logarithmically with the domain size. Our MC results show excellent agreement with the predicted dependence of $\theta (T,\epsilon)$.Comment: 11 pages, 15 figure

Approach to Improve Reading Skill of Students with Dyslexia

The purpose of this research is to define and explain the way of learning to read that is effective in increasing the reading abilities of students with dyslexia. The qualitative research technique that was employed in this study consisted of case study analysis. Those who participated in this research had dyslexia as their primary diagnosis. Interviews, observation, and documentation were employed as data gathering methods, with triangulation techniques being used to assess the validity of the information. Data analysis is carried out by the Miles and Huberman model, which includes data gathering, data reduction, data presentation, and final findings. Several methods were combined to create the method used for dyslexic students, including the phonic method, the syllable peeling method, and the language experience method, as well as simplification of reading practice materials and assistance with a verbal explanation of the material from a special assistant teacher for students, according to the findings. As shown by indications of early reading ability, the technique has the potential to increase early reading abilities in dyslexic pupils. Among these skills are the ability to recognize and read letters and letter sounds, as well as the ability to pronounce words correctly and to read sentences aloud and with the correct pronunciation for an extended period

Stacked optical antennas for plasmon propagation in a 5 nm-confined cavity

The sub-wavelength concentration and propagation of electromagnetic energy are two complementary aspects of plasmonics that are not necessarily co-present in a single nanosystem. Here we exploit the strong nanofocusing properties of stacked optical antennas in order to highly concentrate the electromagnetic energy into a 5 nm metal-insulator-metal (MIM) cavity and convert free radiation into guided modes. The proposed nano-architecture combines the concentration properties of optical nanoantennas with the propagation capability of MIM systems, paving the way to highly miniaturized on-chip plasmonic waveguiding