File card marker Patent

Describing device for flagging punched business card

Improving stability margins in discrete-time LQG controllers

Some of the problems are discussed which are encountered in the design of discrete-time stochastic controllers for problems that may adequately be described by the Linear Quadratic Gaussian (LQG) assumptions; namely, the problems of obtaining acceptable relative stability, robustness, and disturbance rejection properties. A dynamic compensator is proposed to replace the optimal full state feedback regulator gains at steady state, provided that all states are measurable. The compensator increases the stability margins at the plant input, which may possibly be inadequate in practical applications. Though the optimal regulator has desirable properties the observer based controller as implemented with a Kalman filter, in a noisy environment, has inadequate stability margins. The proposed compensator is designed to match the return difference matrix at the plant input to that of the optimal regulator while maintaining the optimality of the state estimates as directed by the measurement noise characteristics

Doped Mott insulators are insulators: hole localization in the cuprates

We demonstrate that a Mott insulator lightly doped with holes is still an insulator at low temperature even without disorder. Hole localization obtains because the chemical potential lies in a pseudogap which has a vanishing density of states at zero temperature. The energy scale for the pseudogap is set by the nearest-neighbour singlet-triplet splitting. As this energy scale vanishes if transitions, virtual or otherwise, to the upper Hubbard band are not permitted, the fundamental length scale in the pseudogap regime is the average distance between doubly occupied sites. Consequently, the pseudogap is tied to the non-commutativity of the two limits $U\to\infty$ ($U$ the on-site Coulomb repulsion) and $L\to\infty$ (the system size).Comment: 4 pages, 3 .eps file

"A Path to Community Development, The Community Reinvestment Act, Lending Discrimination, and the Role of Community Development Banks"

The establishment of a system of federally regulated, for-profit, community development banks (CDBs) would help to fill the financial gap in areas inadequately served by traditional banks, requirements of the Community Reinvestment Act (CRA) notwithstanding. These organizations would be charged with delivering credit, payment, and savings opportunities and providing basic financing to households and small businesses in underserved areas. Such a system would not substitute for the CRA, but rather act as a supplement to current regulation. Proposed exemptions from CRA compliance for depository institutions that invest in the equity of a CDB would weaken the existing law by diluting the investment of the depository institution in its own particular community. Such proposals (under which "investment" has been defined to be as little as one-quarter of one percent of total assets) are not consistent with the spirit of the CRA and would negate the beneficial dialogue that takes place between the institution and the community in which it operates.

Finite-Temperature Quasicontinuum: Molecular Dynamics without All the Atoms

Using a combination of statistical mechanics and finite-element interpolation, we develop a coarse-grained (CG) alternative to molecular dynamics (MD) for crystalline solids at constant temperature. The new approach is significantly more efficient than MD and generalizes earlier work on the quasicontinuum method. The method is validated by recovering equilibrium properties of single crystal Ni as a function of temperature. CG dynamical simulations of nanoindentation reveal a strong dependence on temperature of the critical stress to nucleate dislocations under the indenter

Ferromagnetic material in the eastern red-spotted newt notophthalmus viridescens

Behavioral results obtained from the eastern red-spotted newt (Notophthalmus viridescens) led to the suggestion of a hybrid homing system involving inputs from both a light-dependent and a non-light-dependent mechanism. To evaluate the possible role of a receptor based on biogenic magnetite in this animal, we performed magnetometry experiments on a set of newts previously used in behavioral assays. The natural remanent magnetization (NRM) carried by these newts was strong enough to be measured easily using a direct-current-biased superconducting quantum interference device functioning as a moment magnetometer. Isothermal remanent magnetizations were two orders of magnitude higher than the NRM, suggesting that ferromagnetic material consistent with magnetite is present in the body of the newt. The NRM has no preferential orientation among the animals when analyzed relative to their body axis, and the demagnetization data show that, overall, the magnetic material grains are not aligned parallel to each other within each newt. Although the precise localization of the particles was not possible, the data indicate that magnetite is not clustered in a limited area. A quantity of single-domain magnetic material is present which would be adequate for use in either a magnetic intensity or direction receptor. Our data, when combined with the functional properties of homing, suggest a link between this behavioral response and the presence of ferromagnetic material, raising the possibility that magnetite is involved at least in the map component of homing of the eastern red-spotted newt

"An Alternative in Small Business Finance, Community-Based Factoring Companies and Small Business Lending"

According to Papadimitriou, Phillips, and Wray, at a time when small businesses are suffering from a credit crunch, "niche" financial institutions are filling the void left by more traditional sources of financing, such as commercial banks. The authors argue that the most important of these niche players are community-based factor companies, which are rapidly expanding from their client base in apparel and textiles to finance a range of firms in everything from electronics to health care. The purchase of accounts receivable by factors enhances the balance sheets of their clients, making it easier for the clients to obtain bank financing. Also, because factors are more interested in the creditworthiness of a client's customers than of the client itself, they are willing to extend loans in excess of collateral to rapidly growing businesses. Because factors are becoming an increasingly important source of financing for small and start-up businesses, the authors propose that factors be encouraged to play a broader role in financing firms in distressed communities by (1) making some factors eligible for funding and assistance under legislation regulating community development financial institutions and (2) by allowing investments by banks in factors to count toward compliance under the Community Reinvestment Act.