Spin-Flavor Separation and Non-Fermi Liquid Behavior in the Multichannel Kondo Problem: A Large N Approach

We consider a $SU(N)\times SU(M)$ generalization of the multichannel single-impurity Kondo model which we solve analytically in the limit $N\rightarrow \infty$, $M\rightarrow\infty$, with $\gamma=M/N$ fixed. Non-Fermi liquid behavior of the single electron Green function and of the local spin and flavor susceptibilities occurs in both regimes, $N\le M$ and $N > M$, with leading critical exponents {\em identical} to those found in the conformal field theory solution for {\em all} $N$ and $M$ (with $M\ge 2$). We explain this remarkable agreement and connect it to ``spin-flavor separation", the essential feature of the non-Fermi-liquid fixed point of the multichannel Kondo problem.Comment: 14 pages, 1 Figure (Poscript file attached), Revte

ANALYSIS OF RECENT OPTIONS FOR CHANGES IN U.S. DAIRY POLICY

Agricultural and Food Policy,

Evaluating force field accuracy with long-time simulations of a tryptophan zipper peptide

We have combined a custom implementation of the fast multiple-time-stepping LN integrator with parallel tempering to explore folding properties of small peptides in implicit solvent on the time scale of microseconds. We applied this algorithm to the synthetic {\beta}-hairpin trpzip2 and one of its sequence variants W2W9. Each simulation consisted of over 12 {\mu}s of aggregated virtual time. Several measures of folding behavior showed convergence, allowing comparison with experimental equilibrium properties. Our simulations suggest that the electrostatic interaction of tryptophan sidechains is responsible for much of the stability of the native fold. We conclude that the ff99 force field combined with ff96 {\phi} and {\psi} dihedral energies and implicit solvent can reproduce plausible folding behavior in both trpzip2 and W2W9.Comment: 10 pages, 11 figures, submitted to the Journal of Chemical Physics on June 28, 201

DO FARM BUSINESSES AND BIG BUSINESSES APPLY DIFFERENT CAPITAL BUDGETING PROCEDURES?

Recent studies of capital budgeting procedures used by business executives suggest increasing use of present value methods. This study compares Massachusetts greenhouse business managers use of capital budgeting procedures to those of Fortune 1000 firms. Results indicate that different capital budgeting procedures are used and that the payback criterion remains the most popular for the farm firms studied. Some implications for Extension finance educators are drawn.Agribusiness,

Small Energy Scale for Mixed-Valent Uranium Materials

We investigate a two-channel Anderson impurity model with a $5f^1$ magnetic and a $5f^2$ quadrupolar ground doublet, and a $5f^2$ excited triplet. Using the numerical renormalization group method, we find a crossover to a non-Fermi liquid state below a temperature $T^*$ varying as the $5f^2$ triplet-doublet splitting to the 7/2 power. To within numerical accuracy, the non-linear magnetic susceptibility and the $5f^1$ contribution to the linear susceptibility are given by universal one-parameter scaling functions. These results may explain UBe$_{13}$ as mixed valent with a small crossover scale $T^*$.Comment: 4 pages, 3 figures, REVTeX, to appear in Phys. Rev. Let

Supporting Graduate Student Instructors in Calculus

This paper focuses on the use of the teaching method Peer-Assisted Reflection (PAR) to help graduate student instructors (GSIs) develop as teachers. PAR engages students in analyzing the work of their peers and providing feedback to promote their abilities of communication, collaboration, and persistence. The goals of the PAR activity were taken as goals for instruction generally, and used to support the GSIs to develop student-centered pedagogies. This report provides in depth case studies of two of four GSIs involved in implementing PAR in their introductory calculus recitation sections. Two of the GSIs showed considerable changes in practices and beliefs, while the others showed little growth

Unlinked Mendelian inheritance of red and black pigmentation in snakes: Implications for Batesian mimicry

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/135324/1/evo12902_am.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/135324/2/evo12902.pd

Cas9+ conditionally-immortalized macrophages as a tool for bacterial pathogenesis and beyond.

Macrophages play critical roles in immunity, development, tissue repair, and cancer, but studies of their function have been hampered by poorly-differentiated tumor cell lines and genetically-intractable primary cells. Here we report a facile system for genome editing in non-transformed macrophages by differentiating ER-Hoxb8 myeloid progenitors from Cas9-expressing transgenic mice. These conditionally immortalized macrophages (CIMs) retain characteristics of primary macrophages derived from the bone marrow yet allow for easy genetic manipulation and a virtually unlimited supply of cells. We demonstrate the utility of this system for dissection of host genetics during intracellular bacterial infection using two important human pathogens: Listeria monocytogenes and Mycobacterium tuberculosis