Wichita State University

About: Wichita State University is a education organization based out in Wichita, Kansas, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 4988 authors who have published 9563 publications receiving 253824 citations. The organization is also known as: WSU & Fairmount College.

The (Mythical?) Housing Wealth Effect

Abstract: Models used to guide policy, as well as some empirical studies, suggest that the effect of housing wealth on consumption is large and greater than the wealth effect on consumption from stock holdings. Recent theoretical work, in contrast, argues that changes in housing wealth are offset by changes in housing consumption, meaning that unexpected shocks in housing wealth should have little effect on non-housing consumption. We reexamine the impact of housing wealth on non-housing consumption, employing the Case-Quigley-Shiller data on U.S. housing wealth that have been used in prior studies to estimate a large housing wealth effect. Existing empirical work fails to control for the fact that changes in housing wealth may be correlated with changes in expected permanent income, biasing the resulting estimates. Once we control for the endogeneity bias resulting from the correlation between housing wealth and permanent income, we find that housing wealth has a small and insignificant effect on consumption. Additional analysis of time-series results provides further support for that view.

Small firm growth as a function of both learning orientation and entrepreneurial orientation

Abstract: Purpose – The purpose of this paper is to investigate the relationship between learning orientation (LO), entrepreneurial orientation (EO), and firm growth in small- and medium-sized firms (SMEs). The authors theoretically argue for a mediation effect of EO on the relationship between LO and growth. The study considered how companies that value learning enact actions to affect firm outcomes. This is particularly important for small firms that may not be capable of withstanding significant shocks in the marketplace. Design/methodology/approach – The research design employed the survey method for data gathering and resulted in 105 completed responses from CEOs/presidents of SMEs. To examine the construct validity of the measurement dimensions the authors used a multistage process. Additionally, the authors employed a competing models analytic design to determine the presence and strength of mediating effects of the EO construct. Findings – The findings empirically demonstrate the notion that firm cultural va...

Experimental investigation of FMS machine and AGV scheduling rules against the mean flow-time criterion

Abstract: Although a significant amount of research has been carried out in the scheduling of flexible manufacturing systems (FMSs), it has generally been focused on developing intelligent scheduling systems. Most of these systems use simple scheduling rules as a part of their decision process. While these scheduling rules have been investigated extensively for a job shop environment, there is little guidance in the literature as to their performance in an FMS environment. This paper attempts to investigate the performances of machine and AGV scheduling rules against the mean flow-time criterion. The scheduling rules are tested under a variety of experimental conditions by using an FMS simulation model.

Propeller Performance Measurement for Low Reynolds Number UAV Applications

Abstract: The recent boom in Unmanned Aerial Vehicles (UAV) and Micro Air Vehicles (MAV) aircraft development creates a strong demand for accurate small-diameter propeller performance data. Small-diameter propellers as defined in this paper (diameter 6 inches to 22 inches), operate at low Reynolds numbers (typically between 30,000 and 300,000), rendering performance scaling from larger counterparts inaccurate. An Integrated Propulsion Test System (IPTS) has been designed, developed and validated at Wichita State University (WSU). A large number of propellers have been tested and a reliable database of performance data has been created. This paper discusses the salient features of this measurement system and propeller test data for a few propellers.

Effect of axial ligation or π-π-type interactions on photochemical charge stabilization in two-point bound supramolecular porphyrin-fullerene conjugates

Abstract: Two types of structurally well-defined, self-assembled zinc porphyrin-fullerene conjugates were formed by "two-point" binding strategies to probe the effect of axial ligation or pi-pi-type interactions on the photochemical charge stabilization in the supramolecular dyads. To achieve this, meso-tetraphenylporphyrin was functionalized to possess one or four [18]crown-6 moieties at different locations on the porphyrin macrocycle while fullerene was functionalized to possess an alkyl ammonium cation, and a pyridine or phenyl entities. As a result of the crown ether-ammonium cation complexation, and zinc-pyridine coordination or pi-pi-type interactions, stable zinc porphyrin-fullerene conjugates with defined distance and orientation were formed. Evidence for the zinc-pyridine complexation or pi-pi-type interactions was obtained from the spectral and computational studies. Steady-state and time-resolved emission studies revealed efficient quenching of the zinc-porphyrin singlet excited state in these dyads, and the measured rates of charge separation, k(CS) were found to be slightly better in the case of the dyads held by axial coordination and crown ether-cation complexation. Nanosecond transient absorption studies provided evidence for the electron transfer reactions, and these studies also revealed charge stabilization in these dyads. The lifetimes of the radical ion pairs were found to depend upon the type of porphyrins utilized to form the dyads, that is, porphyrin possessing the crown ether moiety at the ortho position of one of the phenyl rings yielded prolonged charge stabilized states. Addition of pyridine to the supramolecular dyads eliminated the zinc-pyridine coordination or pi-pi-type interactions of the "two-point" bound systems due to the formation of a new zinc-pyridine axial bond thus giving a unique opportunity to probe the effect of axial coordination or pi-pi interactions on k(CS) and k(CR). Under these conditions, the measured electron transfer rates revealed faster k(CS) and slower k(CR) as compared to those obtained in the absence of added pyridine. The evaluated lifetimes of the radical ion-pairs were found to be hundreds of nanoseconds and were longer in the presence of pyridine.