Drake University is a private, co-educational university located in Des Moines, Iowa, USA. The institution offers a number of undergraduate and graduate programs, as well as professional programs in business, law and pharmacy. Drake is one of the twenty-five oldest law schools in the country. Wikipedia.
Haedicke M.A.,Drake University
Sociological Quarterly | Year: 2012
Institutional theory has played a central role in the study of organizations for over half a century, but it often overlooks the actions of the people who bring organizations to life. This article advances an inhabited approach to institutional analysis that foregrounds the creativity of organizational members. It argues that people use local cultures to translate and respond to institutional pressures. The article analyzes qualitative data from countercultural co-op stores that have been pushed to conform to mainstream forms of business organization by a competitive market and demonstrates that translation explains why outcomes that institutional theory would not predict have come to pass. © 2012 Midwest Sociological Society.
Tayal S.S.,Clark Atlanta University |
Zatsarinny O.,Drake University
Astrophysical Journal, Supplement Series | Year: 2010
New improved calculations are reported for transition probabilities and electron impact excitation collision strengths for the astrophysically important lines in S II. The collision strengths have been calculated in the close-coupling approximation using the B-spline Breit-Pauli R-matrix method. The multiconfiguration Hartree-Fock method with term-dependent non-orthogonal orbitals is employed for an accurate representation of the target wave functions. The close-coupling expansion includes 70 bound levels of S II covering all possible terms of the ground 3s 23p 3 and singly excited 3s3p 4, 3s 23p 23d, 3s 23p 24s, and 3s 23p 24p configurations. The present calculations are more extensive than previous ones, leading to a total 2415 transitions between fine-structure levels. The effective collision strengths are obtained by averaging the electron collision strengths over a Maxwellian distribution of velocities and these are tabulated for all fine-structure transitions at electron temperatures in the range from 5000 to 100,000 K. The present results are compared with a variety of other close-coupling calculations and available experimental data. There is an overall good agreement with the recent 18-state calculations by Ramsbottom, Bell, & Stafford and with the 19-state calculations by Tayal for the most part, but some significant differences are also noted for some transitions. © 2010. The American Astronomical Society. All rights reserved.
Rieck M.Q.,Drake University
Journal of Mathematical Imaging and Vision | Year: 2014
The Perspective Three-Point Pose Problem (P3P) is an old and basic problem in the area of camera tracking. While methods for solving it have been largely successful, they are subject to erratic behavior near the so-called "danger cylinder." Another difficulty with most of these methods is the need to select the physically correct solution from among various mathematical solutions. This article presents a new framework from which to study P3P for non-collinear control points, particularly near the danger cylinder. A multivariate Newton-Raphson method to approximately solve P3P is introduced. Using the new framework, this is then enhanced by adding special procedures for handling the problematic behavior near the danger cylinder. It produces a point on the cylinder, a compromise between two nearly equal mathematical solutions, only one of which is the camera's actual position. The compromise diminishes the risk of accidentally converging to the other nearby solution. However, it does impose the need, upon receding from the danger cylinder vicinity, to make a selection between two possible approximate solution points. Traditional algebraic methods depend on correctly selecting from up to four points, each time the camera position is recomputed. In the new iterative method, selecting between just two points is only occasionally required. Simulations demonstrate that a considerable improvement results from using this revised method instead of the basic Newton-Raphson method. © 2013 Springer Science+Business Media New York.
Tills O.,Drake University
Proceedings. Biological sciences / The Royal Society | Year: 2013
Understanding the link between ontogeny (development) and phylogeny (evolution) remains a key aim of biology. Heterochrony, the altered timing of developmental events between ancestors and descendants, could be such a link although the processes responsible for producing heterochrony, widely viewed as an interspecific phenomenon, are still unclear. However, intraspecific variation in developmental event timing, if heritable, could provide the raw material from which heterochronies originate. To date, however, heritable developmental event timing has not been demonstrated, although recent work did suggest a genetic basis for intraspecific differences in event timing in the embryonic development of the pond snail, Radix balthica. Consequently, here we used high-resolution (temporal and spatial) imaging of the entire embryonic development of R. balthica to perform a parent-offspring comparison of the timing of twelve, physiological and morphological developmental events. Between-parent differences in the timing of all events were good predictors of such timing differences between their offspring, and heritability was demonstrated for two of these events (foot attachment and crawling). Such heritable intraspecific variation in developmental event timing could be the raw material for speciation events, providing a fundamental link between ontogeny and phylogeny, via heterochrony.
Zatsarinny O.,Drake University |
Bartschat K.,Drake University
Physical Review Letters | Year: 2011
We present cross sections for electron-impact ionization and simultaneous ionization plus excitation of helium by electron impact. The results are obtained from a fully nonperturbative close-coupling formalism using our B-spline R-matrix approach. A large number of pseudostates in the expansion of the wave function represent the coupling to the ionization continuum. We obtain excellent agreement with the directly measured experimental cross section ratios (Bellm etal., Phys. Rev. A 75, 042704 (2007)PLRAAN1050-294710.1103/PhysRevA.75. 042704) for ionization leaving the residual He⊃+ ion in either the 1s ground state or the n=2 (2s+2p) excited states. © 2011 American Physical Society.
Agency: NSF | Branch: Continuing grant | Program: | Phase: AMO Theory/Atomic, Molecular & | Award Amount: 270.00K | Year: 2014
The project studies the interaction of light (mostly lasers) and charged particles (mostly electrons) with atoms, ions, and small molecules. The results are of importance for the understanding of the fundamental collision dynamics, and they also fulfill the urgent practical need for accurate atomic data to model the physics of stars, plasmas, lasers, and planetary atmospheres. The short-pulse intense-laser part of the project deals with accurate solutions of the time-dependent Schroedinger equation on a numerical space-time grid. With the rapid advances currently seen in computational resources, such studies for realistic rather than idealized model systems have only become possible in recent years. This work is important for further developments in imaging and ultimately controlling of submicroscopic reactions, which is expected to have broad impact by reaching out from physics to chemistry and ultimately biology. Many experimental efforts worldwide are supported through the present project, which will also train a post-doctoral associate and a number of research students in the basic understanding of the problem and the use of highly sophisticated numerical techniques.
Most of the numerical calculations will be based upon the non-perturbative R-matrix (close-coupling) method, as well as direct solutions of the time-dependent Schroedinger equation using various grid-based approaches and basis-function expansions. For single and double ionization of complex atoms by intense atto/femto-second laser pulses, the methods will be combined in such a way that individual parts of the big problem can be treated in highly efficient and optimized ways. This strategy will be extended to the treatment of double ionization involving inner shells as well as diatomic molecules. Of particular interest will be the highly challenging, but ultimately necessary simultaneous treatment of the nuclear and electronic motion. There are major difficulties associated with both the formulation of the problem and the subsequent numerical treatment. Much emphasis will be placed on the testing of numerical methods and the visualization of the results, both of which are ideal for student involvement.
Agency: NSF | Branch: Standard Grant | Program: | Phase: LAW AND SOCIAL SCIENCES | Award Amount: 76.24K | Year: 2015
This project examines the impact that regulatory policy has on out-of-hospital care provided by certified health professionals. It examines the different ways that certified health professionals interpret regulation, follow rules, and understand their scope of practice, given the differing regulatory environments in which they operate. The research asks whether and how the professionalization and regulation of certified health professionals impact the provision of health care; whether regulation operates as intended; and whether voids created by the absence of regulation are filled by other means. In addition, the research examines whether and how certified health professionals seek legal status and regulation, the varying ways in which law is mobilized toward this end, and the impact of such mobilization on the professional identities and legal consciousness of certified health professionals. Answering these questions contributes to theoretical understanding of the important relationship between law and health, and has broad implications for policy-making and the regulation of health care outside of the dominant medical model. The broader impact of the research also includes training and education of undergraduate students.
The project utilizes ethnographic participant-observation, interview research, and documentary evidence coupled with interpretive social science methods in order to analyze the regulations surrounding out-of-hospital care in the United States. In the face of a complex web of regulations and disparate enforcement state-by-state, the project focuses on three states where regulatory environments and implementation varies, and relies on a case study of Certified Professional Midwives (CPMs). The findings of this research will advance sociolegal scholarship and theory on the implementation of laws, legal mobilization, and legal consciousness of social movement and professional actors.
Agency: NSF | Branch: Continuing grant | Program: | Phase: | Award Amount: 185.67K | Year: 2012
The purpose of this project is to further develop a general and effective, fully relativistic computer code for electron and photon interactions with atoms, ions, and molecules using the B-spline R-matrix (BSR) method. This innovative approach has significant advantages over the standard suite of R-matrix codes, mostly developed over the past four decades in Belfast and currently used worldwide. Specifically, the excellent numerical properties of a B-spline basis allow for high computational accuracy, and the ability to employ non-orthogonal sets of term-dependent orbitals allows for compact configuration expansions. During the current funding period, the existing computer code will be fully parallelized, and a new suite of general atomic structure codes will be developed, which directly use the B-spline as an improved interface to the BSR collision codes. Furthermore, a parallelized B-spline code to solve the close-coupling equations in the outer region will be developed, and a pilot version of the BSR program to treat time-dependent processes, such as intense short-pulse XUV laser-atom interactions, will be extended to double ionization and infrared radiation. Finally, the potential use of the BSR method to describe electron and photon interactions with diatomic molecules will be investigated.
The broader impact of the project consists of the further development of a highly successful suite of computer programs to calculate accurate atomic data for a wide variety of electron- and photon-driven processes. The production calculations will focus on atomic targets, for which these data are of critical value to model the physics and chemistry of astrophysical and laboratory plasmas, lasers, and planetary atmospheres. This work will support many experimental projects ranging from industrial lighting systems to fundamental research performed at next-generation synchrotrons and free-electron lasers. The results will be presented at international scientific meetings, and the next version of the computer code will be written up and made available to the public. Finally, undergraduate students will be trained through developing and testing individual modules of the package. This includes running the code on massively parallel computing platforms provided through XSEDE resources.
Agency: NSF | Branch: Continuing grant | Program: | Phase: AMO Theory/Atomic, Molecular & | Award Amount: 320.78K | Year: 2011
This award supports a theoretical program to examine in detail collisions of photons (light), electrons, and heavy charged particles with atoms, ions, and molecules. Highly sophisticated numerical methods and computer programs will be developed and then applied to perform benchmark calculations, whose predictions will be compared with data from state-of-the-art experiments currently being performed in various laboratories worldwide.
The interpretation of the results will lead to a deeper understanding of highly correlated processes on the submicroscopic atomic scale. Of particular interest are processes in ultrashort intense laser fields, at a time scale that allows for the study, and ultimately the control, of electron behavior in chemical processes. Finally, the project provides accurate atomic data, which are needed in many applications, such as modeling plasmas for the lighting industry, processes in planetary atmospheres, and the physics of stars and lasers.
Agency: NSF | Branch: Continuing grant | Program: | Phase: CI REUSE | Award Amount: 182.17K | Year: 2015
The purpose of this project is to continue the development of a fully relativistic computer code for electron and photon interactions with atoms and ions. The code has already been employed in a number of benchmark calculations to obtain highly accurate atomic data of critical importance for fundamental research and practical applications. In particular, the code is being used to model the physics and chemistry of astrophysical and laboratory plasmas, lasers, and planetary atmospheres. The computer code will be made available to the general public through an open-source license and a designated website. Undergraduate students will be trained in modern computational methods through developing and testing individual modules of the package. This includes running the code on massively parallel computing platforms provided through the eXtreme Science and Engineering Discovery Environment (XSEDE) resources supported by the National Science Foundation.
The B-spline R-matrix (BSR) approach has significant advantages over the well-known suite of R-matrix (close-coupling) codes that were developed over the past four decades and are currently used worldwide. Specifically, the numerical properties of a B-spline basis yield high computational accuracy and the ability to employ non-orthogonal sets of term-dependent orbitals allows for compact configuration expansions. After having completed the parallelization of the semi-relativistic version, this project will support the development of a parallel implementation of the fully relativistic Dirac-Coulomb version. The BSR collision codes will also be interfaced with a new suite of general atomic structure codes, which use B-spline expansions directly.