Applications of a laser velocimeter in the Langley 4- by 7-meter tunnel

Applications of a laser velocimeter in the Langley 4 by 7 meter wind tunnel are discussed. The system configuration is described. The data acquisition, the laser velocimeter traversing, and the particle generating systems are discussed. Flow distribution and rotor wake applications are discussed

Design, fabrication and calibration of alpha particle densitometers for measuring planetary atmospheric density

An alpha particle densitometer was developed for possible application to measurement of the atmospheric density-altitude profile on Martian entry. The device uses an Am-241 radioactive-foil source, which emits a distributed energy spectrum, located about 25 to 75 cm from a semiconductor detector. System response - defined as the number of alphas per second reaching the detector with energy above a fixed threshold - is given for Ar and CO2. The altitude profile of density measurement accuracy is given for a pure CO2 atmosphere with 5 mb surface pressure. The entire unit, including dc-dc converters, requires less than 350 milliwatts of power from +28 volts, weighs about 0.85 lb and occupies less than 15 cubic inches volume

Millennial Poetics: A Study of Contemporary Poetry and Its Developing Trends

As a field of creative practice, poetry evolves constantly, resulting in new poetic forms that stand in stark contrast to those produced even a few decades ago. Nonetheless, due to the prevalent fixation on standards of the past, little to no research has been undertaken to explore and support the latest and most innovative voices in the literary community, leading to the stagnation poetry’s development. By examining the various approaches to defining the current poetic movement, this essay seeks to develop an understanding of the state of the genre and stimulate the momentum of poetry’s evolution. In the essay, I explore contemporary anthologies and digital texts, including those influenced by the internet age, written through twitter, popularized by social media, or constructed through search engines. Further, by viewing the tendencies of contemporary poetry alongside generational studies, my essay culminates in the conclusion that the most innovative digital poetry written today reflects the particular sensibilities of the millennial generation

A Model for the Vortex Pair Associated with a Jet in a Cross Flow

A model is presented for the contrarotating vortex pair that is formed by a round, turbulent, subsonic jet directed normally into a uniform, subsonic cross flow. The model consists of a set of algebraic equations that describe the properties of the vortex pair as a function of their location in the jet plume. The parameters of the model are physical characteristics of the vortices such as the vortex strength, spacing, and core size. These parameters are determined by velocity measurements at selective points in the jet plume

Goal-Striving Stress, Social Economic Status, and the Mental Health of Black Americans

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/75558/1/j.1749-6632.1999.tb08172.x.pd

Mahaska County livestock manure/crop nutrient management demonstration project

The project was developed from the requests of Mahaska County producers for information related to management of their livestock systems. Through surveys, sampling, and demonstrations, it was learned that there is a continuing need for individualized consulting linking manure and nutrient management. Producers also want more guidance about residue management and consistency of manure nutrient content

Goal‐Striving Stress and the Mental Health of College‐Educated Black American Men: The Protective Effects of System‐Blame

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/112263/1/j.1939-0025.2011.01116.x.pd

α_1L-adrenoceptors mediate contraction of human erectile tissue

α1-adrenoceptor antagonists can impact upon sexual function and have potential in the treatment of erectile dysfunction. Human erectile tissue contains predominantly α1A-adrenoceptors, and here we examined whether contractions of this tissue are mediated by the functional phenotype, the α1L-adrenoceptor. Functional experiments using subtype selective agonists and antagonists, along with radioligand ([3H]tamsulosin) binding assays, were used to determine the α1-adrenoceptor population. A61603, a α1A-adrenoceptor agonist, was a full agonist with a potency 21-fold greater than that of noradrenaline. The α1A- and α1D-adrenoceptor antagonist tamsulosin antagonized noradrenaline responses with high affinity (pKD = 9.7 ± 0.3), whilst BMY7378 (100 nM) (α1D-adrenoceptor antagonist) failed to antagonize responses. In contrast, relatively low affinity estimates were obtained for both prazosin (pKD = 8.2 ± 0.1) and RS17053 (pKD = 6.9 ± 0.2), antagonists which discriminate between the α1A- and α1L-adrenoceptors. [3H]Tamsulosin bound with high affinity to the receptors of human erectile tissue (pKD = 10.3 ± 0.1) with a receptor density of 28.1 ± 1.4 fmol mg−1 protein. Prazosin displacement of [3H]tamsulosin binding revealed a single homogenous population of binding sites with a relatively low affinity for prazosin (pKi = 8.9). Taken together these data confirm that the receptor mediating contraction in human erectile tissue has the pharmacological properties of the α1L-adrenoceptor. Keywords: Erectile tissue, α1-adrenoceptor subtypes, α1L-adrenoceptor, Tamsulosin, Prazosi