Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 16 of 16
Full-Text Articles in Entire DC Network
Introduction, Ken Mccormick
Explaining Differences In Unemployment Rates Across Iowa Counties In The Early Stages Of The Great Recession, Joslyn Sailer
Explaining Differences In Unemployment Rates Across Iowa Counties In The Early Stages Of The Great Recession, Joslyn Sailer
Major Themes in Economics
Iowa fared better than most other states in the recent recession. Yet within Iowa, there was considerable variation in how each county performed. I use a regression model to investigate the reasons for the differences. Counties that did better than average tended to have larger farm, retail trade, and real estate sectors; they also had larger percentages of both 15 to 19 year olds and Social Security recipients. Counties that fared worse than average typically relied more heavily on government employment.
Economic Development Strategy: The Creative Capital Theory, Zach Fairlie
Economic Development Strategy: The Creative Capital Theory, Zach Fairlie
Major Themes in Economics
This paper aims to identify the relationship between the Creative Capital theory and the unemployment rate. Using panel data from 370 Metropolitan Statistical Areas over a 12-year period, this study finds that talent, technology, and tolerance are not statistically significant determinants of the unemployment rate. The result is contrary to what Creative Capital theory suggests.
The Most Influential Factors In Determining The Happiness Of Nations, Julie Lang
The Most Influential Factors In Determining The Happiness Of Nations, Julie Lang
Major Themes in Economics
Previous research has found that the most influential factors determining the happiness of nations are the Human Development Index (HDI) and the GINI index. Using data from The World Bank, United Nations Development Programme (UNDP) Human Development Reports, The World Database of Happiness, the Satisfaction with Life Scale, and the New Economic Foundation's The (Un) Happy Planet Index 2.0, this study tests three regression models to determine what factors are most influential in determining the happiness of nations, holding everything else constant. All three models suggest that plentiful precipitation contributes to happiness. Two models imply that low corruption, a high …
Why Do Firms Repurchase Stock?, Jordan Voss
Why Do Firms Repurchase Stock?, Jordan Voss
Major Themes in Economics
The tremendous increase in share repurchases warrants an explanation. Why have firms increasingly turned to repurchases as a payout method? Undervaluation is commonly touted as the underlying reason behind repurchase decisions. This paper identifies several possible rationales behind repurchase decisions, in addition to undervaluation, by examining the relative advantages of share repurchases over dividends and the managerial incentives associated with share repurchases. The findings indicate managerial incentives are a key factor behind the decision to repurchase stock.
What Is The Source Of The Male Marital Wage Premium?, Aaron Strike
What Is The Source Of The Male Marital Wage Premium?, Aaron Strike
Major Themes in Economics
The male marital wage premium is the wage difference between married and unmarried men. This paper explores the potential sources of the male marital wage premium using cross-sectional and time series regression models from previous economic research. The studies examined suggest three possible explanations for the marital wage premium: marriage makes men more productive, marriage allows men to spend more time in the labor market, and men who earn above-average wages possess certain characteristics that make them more attractive in the marriage market. The studies examined favor the theories that men are more productive after marriage and higher wages increase …
Development Of A Soil Carbon Index For Iowa Mineral Soils, M. M. Al-Kaisi, T. E. Fenton, J. G. Guzman, B. R. O'Neal
Development Of A Soil Carbon Index For Iowa Mineral Soils, M. M. Al-Kaisi, T. E. Fenton, J. G. Guzman, B. R. O'Neal
Journal of the Iowa Academy of Science: JIAS
A carbon index (Cl) is one of many soil quality indicators that depends on organic carbon concentration. One of the values of a soil carbon index is in determining the impact of agriculture practices (i.e., tillage, crop rotation, N management, etc.) on soil organic matter status of mineral soils. Interactions of climate, parent material, topography, time, and organisms including human activities influence soil organic carbon (SOC). This study developed a soil carbon index for mineral soil map units in Iowa using data collected by the Iowa Cooperative Soil Survey Laboratory and the USDA Soil Survey Laboratory for over 2,300 soil …
Perspectives: Developing And Defining Both Science And Science Education As Disciplines, Robert E. Yager
Perspectives: Developing And Defining Both Science And Science Education As Disciplines, Robert E. Yager
Journal of the Iowa Academy of Science: JIAS
The six "domains" have been identified as features for the "doing" of science. These six are: Concept, Process, Creativity, Attitude, Application, and Worldview. They are offered to affect teaching, student learning, as well as a new way of defining science. Concepts and Processes often are the only two typically used to define school and college science content; Creativity and Positive Attitudes are added as two "enabling" domains; a fifth Domain is offered as a focus on the Application of typical concepts and process skills. It is the Domain where and how most people live and operate! The sixth Domain is …
Editorial Board & Iowa Academy Of Sciences Officers And Directors
Editorial Board & Iowa Academy Of Sciences Officers And Directors
Journal of the Iowa Academy of Science: JIAS
No abstract provided.
Effects Of Berberine, Chelerythrine, And Sanguinarine On Proliferation In Four Human Immortalized Cell Lines, David S. Senchina, Nisarg B. Shah, Marc G. Busch
Effects Of Berberine, Chelerythrine, And Sanguinarine On Proliferation In Four Human Immortalized Cell Lines, David S. Senchina, Nisarg B. Shah, Marc G. Busch
Journal of the Iowa Academy of Science: JIAS
Bloodroot (Sanguinaria canadensis L., Papaveraceae) is a plant rich in benzophenanchridine (isoquinoline) alkaloids such as sanguinarine and chelerychrine. Both isolated alkaloids and whole-tissue rhizome extracts have demonstrated in vitro anticarcinogenic (antiproliferacive) activity in limited immortalized cell culture models, but the relative contribution of various alkaloid constituents to whole-tissue extract activity, and whether or not various alkaloids may act synergistically, has not been investigated. We challenged four immortalized cell lines (Jurkat, K562, Ramos, U937) with various doses of chelerythrine, sanguinarine, and berberine (a structurally and functionally similar alkaloid absent from bloodroot), alone and in all possible combinations, and measured proliferation …
Table Of Contents (Back Cover)
Table Of Contents (Back Cover)
Journal of the Iowa Academy of Science: JIAS
No abstract provided.
Evidence From Detrital Zircon Ages For Middle Pennsylvanian Uplift And Drainage In The Source Area Of The Chariton Conglomerate And Marmaton Group Sandstones, Southern Iowa And Northern Missouri, Scott Mcfadden, Steven H. Emerman, Jane Pedrick Dawson, Kevin A. Rey, Tracy Kemp Anderson
Evidence From Detrital Zircon Ages For Middle Pennsylvanian Uplift And Drainage In The Source Area Of The Chariton Conglomerate And Marmaton Group Sandstones, Southern Iowa And Northern Missouri, Scott Mcfadden, Steven H. Emerman, Jane Pedrick Dawson, Kevin A. Rey, Tracy Kemp Anderson
Journal of the Iowa Academy of Science: JIAS
The Chariton Conglomerate is a quartz/limestone conglomerate of Middle Pennsylvanian age sparsely exposed in southern Iowa and northern Missouri. In Iowa it is characterized by quartz granules and rounded crinoid columnals. The objective of this study was to use detrital zircon ages to determine the provenance of the Chariton Conglomerate and possibly associated Marmaton Group sandstone beds. Detrital zircon ages were obtained for five conglomerate and two sandstone beds of the Chariton Conglomerate in Iowa, three conglomerate beds of the Chariton Conglomerate in Missouri, and two sandstone beds of the Marmaton Group in Iowa. According to the Kolmogorov-Smirnoff Test, the …
Harlan's Ground Sloth (Paramylodon Harlant) (Xenarthra: Mylodontidae) From The Late Pleistocene (Rancholabrean) Of Iowa, H. Gregory Mcdonald
Harlan's Ground Sloth (Paramylodon Harlant) (Xenarthra: Mylodontidae) From The Late Pleistocene (Rancholabrean) Of Iowa, H. Gregory Mcdonald
Journal of the Iowa Academy of Science: JIAS
Harlan's ground sloth, Paramylodon harlani, is documented for the first time from Iowa. The record is based on a fifth metacarpal recovered from a gravel bar within West Tarkio Creek, Page County. While the specimen was not found in situ, and could not be radiocarbon dated, the local geology suggests that it was probably derived from sediments that post-date Peorian loess deposition and is late Wisconsinan in age. This specimen extends the range of Paramylodon 350 km ro the northeast of the closest previously known locality. Its size is slightly larger than average for other late Pleisrocene (Rancholabrean) …