Some Physiochemical Parameters and Phytoplankton Standing Crop in Four Northeast Arkansas Commercial Fish Ponds

Physicochemical conditions and chlorophyll a standing crop were studied from July 1970 through June 1971 in four commercial catfish ponds at the Arkansas State University Experiment Farm near Walcott, Greene County, Arkansas. Determinations of dissolved oxygen, free carbon dioxide, total alkalinity, temperature, pH, transparency, and chlorophyll a standing crop were made at two-week intervals except during fish harvesting operations. One diurnal measurement of dissolved oxygen, free carbon dioxide, and temperature was conducted 25-26 June 1971. Increased oxygen concentrations coincided with increased chlorophyll α concentrations. Free carbon dioxide and chlorophyll α values varied inversely throughout the study. Diurnal concentrations of free carbon dioxide were greatest between 0300 and 0700 hours. Phenolphthalein and total alkalinity values fluctuated throughout the study period, and could not be correlated with other parameters measured. Thermal stratification occurred during the summer and was more pronounced in the more turbidponds. Diurnal temperature measurements indicated that stratification was diurnal. An inverse relationship was found between carbon dioxide and hydrogen-ion concentrations, and all ponds were essentially alkaline. Transparency was relatively constant before the ponds were drained but increased when the ponds were refilled. Suspended particulate matter contributed significantly to turbidity. Peaks of chlorophyll α concentration were found in summer, early autumn, and late winter

Enough glory for us all : the negro exhibit at the Jamestown Tercentennial Exposition, 1907

The Jamestown Tercentennial Exposition of 1907 invited the United States and the world to display their progress in a way befitting the dawn of a new century. Though this exposition fell short of matching the notoriety of other Victorian fairs, African- Americans successfully presented their advancement and historic contributions to American society, despite the shortcomings of the exposition itself and the dismal state of the nation\u27s race relations. Black organizers at Jamestown underscored the rise of their people by maintaining firm control over the entire Negro exhibit, an achievement viewed as untenable at earlier fairs. Records of the United States Tercentennial Commission, correspondence of the principal actors, publications produced by the Jamestown Tercentennial Company and its reviewers, and newspaper stories from both the white and black press evidence the many obstacles overcome to prepare the exhibit. This thesis concludes that the commitment of dynamic leaders, particularly Giles B. Jackson and Thomas J. Calloway, assured African-American success at Jamestown. Moreover, their adherence to the philosophy of Booker T. Washington produced remarkable white support while raising vocal critics within the black community

Nmr of phosphorus-containing solids

The purpose of this work has been the determination of structure in solids using the technique of solid-state nuclear magnetic resonance spectroscopy. High-resolution (^31) p NMR spectra have been obtained for a range of phosphate species. A number of techniques have been applied to these systems including cross-polarization, magic angle spinning, and high power proton decoupling. Characterisation using additional NMR techniques such as (^1) H cramps has been carried out wherever possible. The results obtained yield molecular and crystallographic information consistent with data from X-ray diffraction when known. Shielding tensor components were determined from static and/or spinning spectra wherever possible. The phosphate species studied include a series of precipitated calcium phosphates. A particular model for the structure of amorphous calcium phosphate is favoured in the light of (^31) p NMR measurements. One sample showed NMR evidence for changes in composition whilst in the solid state. The origins of (^31) p NMR line widths in high-resolution solid-state spectra have been considered in some detail. Variation of (^31) p NMR linewidth as function of spinning rate has been noted for a number phosphate compounds. Multiple pulse techniques have been applied on the phosphorus channel with pleasing improvements in spectral resolution. Five solid binary phosphorus sulphides have also been studied using phosphorus MAS NMR, and the results compared to solution state data wherever possible. A number of anomalies between solution and solid-state data have been noted and discussed

Some current ideas in social casework: a survey of current periodical literature

Thesis (M.S.)--Boston Universit

A Mystery in the Georgia Woods: The Woolfolk Murders

When you take a walk in the woods to hunt or just to enjoy the outdoor beauty, you never know what might have happened there in the past. A large tract of woodlands in Bibb County is a good example. When I visited there recently, the woods were calm and quiet and the mature oak trees stood in silent witness to the violence that occurred here many years ago. But on August 6, 1887 nine persons were slain at this location in the woods, just off highway 74 in Bibb County. The house where the murders occurred is long gone, but nine members of the Ocmulgee Archaeological Society (strangely, number of murder victims here also was nine!) came to investigate and to re-establish the lost location of the house site. In this goal we were successful and located the house site, along with supporting house debris (such as bricks, hinges, and an old window weight), and the old well. We came to this site not to judge prior events, but to re-examine an historical event and document physical remains of the murder site as an official Georgia archaeological site

The Doubly Stochastic Single Eigenvalue Problem: An Empirical Approach

The doubly stochastic single eigenvalue problem asks what is the set DSn of all complex numbers that occur as an eigenvalue of an n-by-n doubly stochastic matrix. For n \u3c 5, this set is known and for the analogous set for (singly) stochastic matrices, the set is known for all n. For Pk , the polygon formed by the k-th roots of unity, Unk=1 Pk ⊆ DSn, as is easily shown. For n \u3c 5, this containment is an equality, but for n = 5, the containment is strict (though it is close). Presented here is substantial, computational evidence that the containment is an equality for 6 ≤ n ≤ 10 and for what DS5 actually is

Some current ideas in social casework: a survey of current periodical literature

Thesis (M.S.)--Boston Universit

An evaluation of power relationships among stakeholders in the tourism industry networks of Agra, India

Tourism-related businesses require a multitude of resources in order to operate successfully and given these resources can be accrued from more than one source, bases of power become complex. This is an inductive study which critically evaluates the application of stakeholder theory to an analysis of the tourism destination networks of Agra, India. It examines the relationships of power and dependency that exist between individual and group organisations and the way in which they motivate their behaviour towards each other. The key findings show that resource-based power is formed from the power of individual businesses, the power of the ancillary services stakeholders and the power of the authorities and that network-based power is acquired from the power of agents and the power of groups. © 2014 © 2014 Taylor & Francis