Kent State University

About: Kent State University is a education organization based out in Kent, Ohio, United States. It is known for research contribution in the topics: Liquid crystal & Population. The organization has 10897 authors who have published 24607 publications receiving 720309 citations. The organization is also known as: Kent State & KSU.

Accurate Method for Calculating Mesopore Size Distributions from Argon Adsorption Data at 87 K Developed Using Model MCM-41 Materials

Abstract: Argon adsorption isotherms were measured at 87 K for two macroporous silicas and a series of high-quality MCM-41 silicas with approximately cylindrical pores of average diameters from 2 to 6.5 nm. The pore sizes of the MCM-41 samples were accurately determined in earlier studies on the basis of powder X-ray diffraction and nitrogen adsorption using a geometrical relation between the pore volume, pore−center distance, and pore size in the honeycomb structure. Thus acquired model argon adsorption data for cylindrical mesopores were used to determine the statistical film thickness in the pores and the relation between the pore core radius and the capillary condensation/evaporation pressure. The statistical film thickness curve (t-curve) was extrapolated over the entire pressure range by using data for suitable macroporous silicas. The t-curve is reported in forms of a simple empirical equation and tabulated data. The relation between the pore core radius and the capillary condensation pressure was interpolat...

An analysis of ozone damage to historical maize and soybean yields in the United States

Abstract: Numerous controlled experiments find that elevated ground-level ozone concentrations ([O3]) damage crops and reduce yield. There have been no estimates of the actual yield losses in the field in the United States from [O3], even though such estimates would be valuable for projections of future food production and for cost-benefit analyses of reducing ground-level [O3]. Regression analysis of historical yield, climate, and [O3] data for the United States were used to determine the loss of production due to O3 for maize (Zea mays) and soybean (Glycine max) from 1980 to 2011, showing that over that period production of rain-fed fields of soybean and maize were reduced by roughly 5% and 10%, respectively, costing approximately $9 billion annually. Maize, thought to be inherently resistant to O3, was at least as sensitive as soybean to O3 damage. Overcoming this yield loss with improved emission controls or more tolerant germplasm could substantially increase world food and feed supply at a time when a global yield jump is urgently needed.

Recovery of traceability links between software documentation and source code

Abstract: An approach for the semi-automated recovery of traceability links between software documentation and source code is presented. The methodology is based on the application of information retrieval techniques to extract and analyze the semantic information from the source code and associated documentation. A semi-automatic process is defined based on the proposed methodology. The paper advocates the use of latent semantic indexing (LSI) as the supporting information retrieval technique. Two case studies using existing software are presented comparing this approach with others. The case studies show positive results for the proposed approach, especially considering the flexibility of the methods used.

Quark flavor effects on gluon and ghost propagators

Abstract: We compute the full nonperturbative ghost and gluon two-point Green functions by using gauge field configurations with ${N}_{f}=2$ and ${N}_{f}=2+1+1$ twisted-mass quark flavors. We use simulations with several different light quark masses, heavy quark masses close to that of the strange and charm quarks, and the lightest pseudoscalar masses ranging from 270 to 510 [MeV]. Quark flavor effects on both the gluon and the ghost propagators are then investigated in a wide range of momenta, bridging the deep infrared and intermediate momenta domain of QCD interactions in the presence of dynamical quarks. The ghost-gluon vertex is also indirectly probed through a consistency requirement among the lattice data for the gluon and ghost propagators and the ghost propagator Schwinger-Dyson equation. The effective full QCD coupling is finally constructed, and its dependence on the presence of dynamical fermions scrutinized.