Mortgage Credit Availability and Residential Construction

macroeconomics,mortgage credit, homebuilding

Review of the St Louis boiler trials

Thesis (Mechanical engineer)--University of Illinois, 1905Typescrip

Pressure distributions and oil-flow patterns for a swept circulation-control wing

Pressure distributions and photographs of oil flow patterns are presented for a circulation control wing. The model was an aspect ratio four semispan wing mounted on the side wall of the NASA Ames Transonic Wind Tunnel. The airfoil was a 20 percent thick ellipse, modified with circular leading and trailing edges of 4 percent radius, and had a 25.4 cm constant chord. This configuration does not represent a specific wing design, but is generic. A full span, tangetial, rearward blowing, circulation control slot was incorporated ahead of the trailing edge on the upper surface. The wing was tested at Mach numbers from 0.3 to 0.75 at sweep angle of 0 to 45 deg with internal to external pressure ratios of 1.0 to 3.0. Lift and pitching momemt coefficients were obtained from measured pressure distributions at five span stations. When the conventional corrections resulting from sweep angle are applied to the lift and moment of circulation control sections, no additional corrections are necessary to account for changes in blowing efficiency. This is demonstrated for an aft sweep angle of 45 deg. An empirical technique for estimating the downwash distribution of a swept wing was validated

Ghost center and representations of the diagonal reduction algebra of osp(1∣2)\mathfrak{osp}(1|2)

Reduction algebras are known by many names in the literature, including step algebras, Mickelsson algebras, Zhelobenko algebras, and transvector algebras, to name a few. These algebras, realized by raising and lowering operators, allow for the calculation of Clebsch-Gordan coefficients, branching rules, and intertwining operators; and have connections to extremal equations and dynamical R-matrices in integrable face models. In this paper we continue the study of the diagonal reduction superalgebra $A$ of the orthosymplectic Lie superalgebra $\mathfrak{osp}(1|2)$. We construct a Harish-Chandra homomorphism, Verma modules, and study the Shapovalov form on each Verma module. Using these results, we prove that the ghost center (center plus anti-center) of $A$ is generated by two central elements and one anti-central element (analogous to the Scasimir due to Le\'{s}niewski for $\mathfrak{osp}(1|2)$). As another application, we classify all finite-dimensional irreducible representations of $A$. Lastly, we calculate an infinite-dimensional tensor product decomposition explicitly.Comment: 27 pages; updated introduction: references and motivation; readability; comments welcomed

Costs Associated with Recurrent Epistaxis in a Patient with a Ventricular Assist Device

Mucosal bleeding is a well-known complication of having a ventricular assist device and commonly presents with epistaxis. Although the frequency of epistaxis as a complication in patients with a ventricular assist device has been documented in the literature, to our knowledge the cost of this complication has not been reported. This case report examines the financial burden of ventricular assist device-associated epistaxis in a single patient from September 2018 to December 2019 using ICD 10 diagnostic codes. The patient was found to have accumulated $138,020 in costs over 38 encounters. This case report not only highlights the recurrent nature and potential high cost of epistaxis in this patient population, but also identifies a target to reduce healthcare spending. Further research is needed to assess whether cheap and simple preventative measures such as nasal hygiene regimen can decrease the frequency and/or severity of epistaxis in the patients with a ventricular assist device

Biotechnology: Impact on Iowa\u27s Agricultural Economy

Agriculture has always been an important cornerstone of Iowa\u27s economy. The highly publicized difficulties in the agricultural economy in Iowa have highlighted both the importance of agriculture and pitfalls when agriculture is hit by adverse conditions. Iowa\u27s agriculture and agricultural infrastructure have a heritage characterized by the development of very efficient production technology and the early use of innovative ideas. The early adoption of hybrid corn is but one example of the acceptance new technology. Today more than ever before there is a need for improved profitability and for the possibility of diversification of agricultural products in Iowa. The following papers are a result of a symposium presented at the 99th Annual Meeting of the Iowa Academy of Science held at Grinnell College on Friday, April 24, 1987. Interest in the general session speaker and the symposium held in the afternoon was gratifying. The presentations ranged from descriptions of the technical innovations and potential of the technology for increasing agricultural productivity to those which describe the social and economic implications of agricultural research policy

Electronic structure of REREAuMg and REREAgMg (RERE = Eu, Gd, Yb)

We have investigated the electronic structure of the equiatomic EuAuMg, GdAuMg, YbAuMg and GdAgMg intermetallics using x-ray photoelectron spectroscopy. The spectra revealed that the Yb and Eu are divalent while the Gd is trivalent. The spectral weight in the vicinity of the Fermi level is dominated by the mix of Mg $s$, Au/Ag $sp$ and $RE$ $spd$ bands, and not by the $RE$ $4f$. We also found that the Au and Ag $d$ bands are extraordinarily narrow, as if the noble metal atoms were impurities submerged in a low density $sp$ metal host. The experimental results were compared with band structure calculations, and we found good agreement provided that the spin-orbit interaction in the Au an Ag $d$ bands is included and correlation effects in an open $4f$ shell are accounted for using the local density approximation + Hubbard $U$ scheme. Nevertheless, limitations of such a mean-field scheme to explain excitation spectra are also evident.Comment: 4 pages, 3 figures, Brief Repor