Improvement of Fourier Polarimetry for applications in tomographic photoelasticity

The use of the Fourier Polarimetry method has been demonstrated to extract the three characteristic parameters in integrated photoelasticity. In contrast to the phase-stepping method, it has been shown that the Fourier method is more accurate. However, the Fourier method isn't very efficient as it requires that a minimum of nine intensity images be collected during a whole revolution of a polarizer while the phase-stepping method only needs six intensity images. In this paper the Fourier transformation is used to derive the expression for determination of the characteristic parameters. Four Fourier coefficients are clearly identified to calculate the three characteristic parameters. It is found that the angular rotation ratio could be set arbitrarily. The angular rotation ratio is optimized to satisfy the requirements of efficiency and proper data accuracy, which results in data collection about three times faster than the methods suggested by previous researchers. When comparing their performance in terms of efficiency and accuracy, the simulated and experimental results show that these angular rotation ratios have the same accuracy but the optimized angular rotation ratio is significantly faster. The sensitivity to noise is also investigated and further improvement of accuracy is suggested

Fuselage structure using advanced technology fiber reinforced composites

A fuselage structure is described in which the skin is comprised of layers of a matrix fiber reinforced composite, with the stringers reinforced with the same composite material. The high strength to weight ratio of the composite, particularly at elevated temperatures, and its high modulus of elasticity, makes it desirable for use in airplane structures

The use of digital technology for portfolio creation, management and utilization

The purpose of this study was to create a digital portfolio that was practical and effective for both teachers and parents

Alien Registration- Tomlinson, Clayton H. (Woodville, Penobscot County)

https://digitalmaine.com/alien_docs/10341/thumbnail.jp

Pelvic and Nervous Diseases.: The Third Element in the Equation Between Pelvic and Abdominal Disease in Women and Disturbance in the Nervous System.

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The Censorship of Misogynistic Rap Music - A Consideration of Gender-Based Harms and Free Speech

The lyrics of gangster rap music have created a storm of controversy in the United States and elsewhere. This article considers the censorship of misogynistic rap music, analysing both the harm which it may do to women, and the way in which free speech principles apply to rap music. The criteria for works to be censored in New Zealand and the United States are analysed. Comments are made about how the New Zealand Classification Office should treat rap music works. It is argued that censorship of rap will rarely be justified. The article concludes by examining an interesting and fundamental difference between the free speech principles of the two jurisdictions: American free speech doctrine treats censorship based on the work's viewpoint with hostility, whereas New Zealand law advocates censorship of this kind

Design and performance of a 39cm balloon-borne telescope

A system for stabilizing a balloon-borne telescope using a star sensor device is described. Guide stars from minus four to plus four magnitude can be used and the sensor may be offset with respect to the telescope by as much as plus or minus five degrees in elevation and cross elevation to enable parts of the sky containing no suitable guide stars to be viewed. Acquisition of the guide star and setting of the offset coordinates is carried out by ground command and both may be changed in flight. The main design parameters of the equipment are summarized. Block diagrams and circuit diagrams of the star tracker are provided

Velocity weakening and possibility of aftershocks in nanofriction experiments

We study the frictional behavior of small contacts as those realized in the atomic force microscope and other experimental setups, in the framework of generalized Prandtl-Tomlinson models. Particular attention is paid to mechanisms that generate velocity weakening, namely a decreasing average friction force with the relative sliding velocity.The mechanisms studied model the possibility of viscous relaxation, or aging effects in the contact. It is found that, in addition to producing velocity weakening, these mechanisms can also produce aftershocks at sufficiently low sliding velocities. This provides a remarkable analogy at the microscale, of friction properties at the macroscale, where aftershocks and velocity weakening are two fundamental features of seismic phenomena.Comment: 8 pages, 7 figure