Developing a New Partnership

Many factors contribute to the success and impact of a Mathematics Resource Teacher on K-5 mathematics instruction. Developing a strong partnership with stakeholders and sharing a common vision for quality mathematics instruction are key factors in the successful implementation of the Mathematics Resource Teacher program. In this article, we share the experience of elementary school principal, Timothy Martino, as he prepared to open a new elementary school in August 2012. Frederick Douglass Elementary opened with a full-time, school-embedded Mathematics Resource Teacher, Mrs. Cindy Brady. Timothy Martino and Mrs. Brady developed a partnership with division-level central office staff and with the teachers of Frederick Douglass Elementary. Thus, they began the journey toward improving mathematics instruction for students through a team approach

Numerical methods for analyzing electromagnetic scattering

Numerical methods to analyze electromagnetic scattering are presented. The dispersions and attenuations of the normal modes in a circular waveguide coated with lossy material were completely analyzed. The radar cross section (RCS) from a circular waveguide coated with lossy material was calculated. The following is observed: (1) the interior irradiation contributes to the RCS much more than does the rim diffraction; (2) at low frequency, the RCS from the circular waveguide terminated by a perfect electric conductor (PEC) can be reduced more than 13 dB down with a coating thickness less than 1% of the radius using the best lossy material available in a 6 radius-long cylinder; (3) at high frequency, a modal separation between the highly attenuated and the lowly attenuated modes is evident if the coating material is too lossy, however, a large RCS reduction can be achieved for a small incident angle with a thin layer of coating. It is found that the waveguide coated with a lossy magnetic material can be used as a substitute for a corrugated waveguide to produce a circularly polarized radiation yield

Numerical methods for analyzing electromagnetic scattering

Attenuation properties of the normal modes in an overmoded waveguide coated with a lossy material were analyzed. It is found that the low-order modes, can be significantly attenuated even with a thin layer of coating if the coating material is not too lossy. A thinner layer of coating is required for large attenuation of the low-order modes if the coating material is magnetic rather than dielectric. The Radar Cross Section (RCS) from an uncoated circular guide terminated by a perfect electric conductor was calculated and compared with available experimental data. It is confirmed that the interior irradiation contributes to the RCS. The equivalent-current method based on the geometrical theory of diffraction (GTD) was chosen for the calculation of the contribution from the rim diffraction. The RCS reduction from a coated circular guide terminated by a PEC are planned schemes for the experiments are included. The waveguide coated with a lossy magnetic material is suggested as a substitute for the corrugated waveguide

Wave attenuation and mode dispersion in a waveguide coated with lossy dielectric material

The modal attenuation constants in a cylindrical waveguide coated with a lossy dielectric material are studied as functions of frequency, dielectric constant, and thickness of the dielectric layer. A dielectric material best suited for a large attenuation is suggested. Using Kirchhoff's approximation, the field attenuation in a coated waveguide which is illuminated by a normally incident plane wave is also studied. For a circular guide which has a diameter of two wavelengths and is coated with a thin lossy dielectric layer (omega sub r = 9.1 - j2.3, thickness = 3% of the radius), a 3 dB attenuation is achieved within 16 diameters

Fermi Surface Nesting and Nanoscale Fluctuating Charge/Orbital Ordering in Colossal Magnetoresistive Oxides

We used high resolution angle-resolved photoemission spectroscopy to reveal the Fermi surface and key transport parameters of the metallic state of the layered Colossal Magnetoresistive (CMR) oxide La1.2Sr1.8Mn2O7. With these parameters the calculated in-plane conductivity is nearly one order of magnitude larger than the measured DC conductivity. This discrepancy can be accounted for by including the pseudogap which removes at least 90% of the spectral weight at the Fermi energy. Key to the pseudogap and many other properties are the parallel straight Fermi surface sections which are highly susceptible to nesting instabilities. These nesting instabilities produce nanoscale fluctuating charge/orbital modulations which cooperate with Jahn-Teller distortions and compete with the electron itinerancy favored by double exchange

Where are the Hedgehogs in Nematics?

In experiments which take a liquid crystal rapidly from the isotropic to the nematic phase, a dense tangle of defects is formed. In nematics, there are in principle both line and point defects (``hedgehogs''), but no point defects are observed until the defect network has coarsened appreciably. In this letter the expected density of point defects is shown to be extremely low, approximately $10^{-8}$ per initially correlated domain, as result of the topology (specifically, the homology) of the order parameter space.Comment: 6 pages, latex, 1 figure (self-unpacking PostScript)

The Pros and Cons of Gene Patents

The debate over human gene patents was recently reignited by New York federal Judge Robert Sweet, when he found isolated human gene sequences unpatentable in Association for Molecular Pathology v. U.S. Patent and Trademark Office , 702 F.Supp.2d 181 (S.D.N.Y. 2010). An appeal of the decision is pending, and in October, the U.S. Department of Justice filed an amicus curiae brief in the case arguing that such gene sequences should not be patentable, contradicting long-standing practices of the United States Patent and Trademark Office. Given the potent impact of a possible gene patent ban on gene-based medical therapies and the biotechnology industry at large, the arguments for and against patenting human genes must be carefully considered. Unfortunately, much of the current legal debate has centered on technical aspects of patent law doctrine and not the significant policy arguments that also need to be resolved. It is therefore important to evaluate the issue in a fuller context, taking into account health care access, scientific research and ethical concerns

The Pros and Cons of Gene Patents

The debate over human gene patents was recently reignited by New York federal Judge Robert Sweet, when he found isolated human gene sequences unpatentable in Association for Molecular Pathology v. U.S. Patent and Trademark Office , 702 F.Supp.2d 181 (S.D.N.Y. 2010). An appeal of the decision is pending, and in October, the U.S. Department of Justice filed an amicus curiae brief in the case arguing that such gene sequences should not be patentable, contradicting long-standing practices of the United States Patent and Trademark Office. Given the potent impact of a possible gene patent ban on gene-based medical therapies and the biotechnology industry at large, the arguments for and against patenting human genes must be carefully considered. Unfortunately, much of the current legal debate has centered on technical aspects of patent law doctrine and not the significant policy arguments that also need to be resolved. It is therefore important to evaluate the issue in a fuller context, taking into account health care access, scientific research and ethical concerns

Patenting Human Genes: The Myriad Controversy

The controversy over human gene patents was reignited in March 2010 when a US Federal District Court decided that isolated human gene sequences are not patentable. An appeal is pending, although the US Department of justice filed a friend-of-the-court brief in the case in late October, arguing that such gene sequences should not be patentable. Because this case may eventually find its way to the US Supreme Court, the ruling could have significant implications for gene-based medical therapies and for the biotechnology industry overall. It is therefore important to assess both the past and present context of this controversy, taking into account scientific research, health care access, and ethical concerns