Jerry T. Ball

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We describe the use of a unique plant growth facility, which has as its centerpiece four 'EcoCELLs', or 5x7 m mesocosms designed as open-flow, mass-balance systems for the measurement of carbon, water and trace gas fluxes. This system is unique in that it was conceived specifically to bridge the gap between measurement scales during long-term experiments(More)
This paper summarizes the data on nutrient uptake and soil responses in opentop chambers planted with ponderosa pine (Pinus ponderosa Laws.) treated with both N and CO2. Based upon the literature, we hypothesized that 1) elevated CO2 would cause increased growth and yield of biomass per unit uptake of N even if N is limiting, and 2) elevated CO2 would cause(More)
The distribution of photosynthetic activity over the area of a leaf and its change with time was determined (at low partial pressure of O(2)) by recording images of chlorophyll fluorescence during saturating light flashes. Simultaneously, the gas exchange was being measured. Reductions of local fluorescence intensity quantitatively displayed the extent of(More)
The main objective of the Synthetic Teammate project is to develop language and task enabled synthetic agents capable of being integrated into team training simulations. To achieve this goal without detriment in team training, the synthetic agents must be capable of closely matching human behavior. The initial application for the Synthetic Teammate research(More)
The goal of the on-going project described in this paper is evaluation of the utility of Latent Semantic Analysis (LSA) for unsupervised word sense discrimination. The hypothesis is that LSA can be used to compute context vectors for ambiguous words that can be clustered together – with each cluster corresponding to a different sense of the word. In this(More)
Double R Model (Referential and Relational Model) is a model of language comprehension intended for use in the development of software agents with NLP capabilities. Double R Model is fairly unique in adopting a cognitively plausible approach to modeling language comprehension, while at the same time attempting to support the development of large-scale,(More)
This paper describes changes to a model of reading comprehension to improve its reading rate and bring it into closer alignment with human reading rates. The broader context of the research is development of language capable synthetic teammates that can be integrated into team training simulations. To use synthetic teammates in team training without(More)
Double R Grammar is a linguistic theory of the grammatical encoding and integration of referential and relational meaning in English. Double R Grammar is fundamentally a Cognitive Linguistic theory (Langacker, 1987, 1991; Lakoff, 1988; Talmy, 2003) and the use of the term “grammar” encompasses both meaning and structure as it does in Cognitive Grammar (also(More)
The effects of six years treatment with elevated [CO2] (350, 525, and 700 μl l-1) and nitrogen (N) (0, 10, and 20 g N m-2 yr-1) on soils, soil solution, and CO2 efflux in an open-top chamber study with ponderosa pine (Pinus ponderosa Laws.) are described. The clearest [CO2] effect was in year 6, when a pattern of lower soil N concentration and higher C/N(More)