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Pullman, WA, United States

Decagon Devices is an American corporation that designs and markets scientific instruments, sensors, data loggers, and accessories. Decagon was founded in 1983 by Dr. Gaylon Campbell. Currently, Decagon designs and manufactures several different types of instruments that are used in both agricultural and food science applications. Decagon is headquartered in Pullman, Washington.Decagon Devices was selected by the Wall Street Journal in 2008 as one of the "Top Small Workplaces." Wikipedia.

Carter B.P.,Decagon Devices, Inc. | Schmidt S.J.,University of Illinois at Urbana - Champaign
Food Chemistry | Year: 2012

The food polymer science (FPS) approach has been effectively used to investigate the physical stability of amorphous food materials. The glass transition, a key FPS parameter, has traditionally been determined using thermal techniques that scan temperature while holding the plasticizer (moisture) content constant. Moisture sorption isotherms provide information about the physical properties of food as the plasticizer level is adjusted and temperature is held constant. New automatic isotherm generators can be used to produce high resolution, dynamic isotherms much faster than traditional static methods. Dynamic isotherms for a small selection of amorphous materials have been investigated and shown to experience distinct inflection points in the water activity region where the glass transition temperature is close to the experimental temperature. Several studies on amorphous spray dried milk powder and amorphous polydextrose indicate very good agreement between glass transitions determined using thermal techniques and dynamic isotherm methods. This agreement suggests that dynamic isotherms are a viable alternative to traditional thermal methods for investigating glass transitions of amorphous foods. © 2011 Elsevier Ltd. All rights reserved. Source

Osroosh Y.,Washington State University | Peters T.R.,Washington State University | Campbell C.S.,Decagon Devices, Inc.
Journal of Irrigation and Drainage Engineering | Year: 2015

To maximize irrigation efficiency, applied water has to be precisely adjusted to the crop water use. This study develops a method based on the energy balance of a single apple leaf to calculate potential transpiration (Ep) for the whole apple tree. The Ep model was based on two main submodels predicting canopy temperature (Tc) and total canopy conductance (gT). The gT model was derived by simplifying the energy budget to rely on only climatic data and an empirical coefficient. These submodels were evaluated using the canopy temperature data collected in a Fuji apple orchard during the 2007, 2008, and 2013 growing seasons. The applicability of the Ep model was examined on (1) well-watered, young Fuji apple trees, and (2) well-irrigated, older apple trees bearing little fruit. Predicted potential transpiration rates at both scenarios were compared with those predicted by the ASCE standardized Penman-Monteith values for alfalfa (ETr). Daily average weather data collected during the three growing seasons provided the inputs to the Ep model and its components. With the exception of air temperature measured in the orchard, the rest of the meteorological data were obtained from a local weather station. The canopy temperatures of the fully watered trees were predicted during midseason with mean absolute errors (MAEs) of about 0.41, 0.33, and 0.23°C in 2007, 2008, and 2013, respectively. These MAEs were better than the individual IRT accuracy of ±0.6°C. The coefficient of variation (CV) of the predictions averaged 2% over the experiment plots/years, being better than that of the measurements (CV=4.8%) with the exception of one plot in 2007 with little difference (3% versus 2%). Ep was fairly correlated with ETr on warm and dry days (R2=0.58, p<0.001) with slope and intercept values of close to 1.0 and 0.0, respectively. The model was able to reflect the high degree of coupling between the apple trees and the humidity of the surrounding air during cold and humid periods as Ep resulted in significantly lower values. The overall results of the experiments with Fuji apple trees showed that the non-water-stressed baselines and potential transpiration of Fuji apple trees can be estimated using the proposed approach. © 2015 American Society of Civil Engineers. Source

Buehler M.,Decagon Devices, Inc.
IEEE International Conference on Microelectronic Test Structures | Year: 2015

The cleanliness of glass beads was assessed using a test structure and low-frequency dielectric spectroscopy operating between 10 mHz and 100 kHz. Glass beads were exposed to moisture between 40 and 85% RH. Results indicate that capillary and film water can be used to indicate the state of cleanliness. © 2015 IEEE. Source

Pinto J.R.,U.S. Department of Agriculture | Marshall J.D.,University of Idaho | Dumroese R.K.,U.S. Department of Agriculture | Davis A.S.,University of Idaho | Cobos D.R.,Decagon Devices, Inc.
Forest Ecology and Management | Year: 2011

A properly selected stocktype can greatly enhance reforestation success through increased survival and growth following outplanting. Implementing a robust stocktype trial using stocktypes of equal quality can ensure results lead to the best choice. Six container types, differing primarily in depth and volume, were used to evaluate the performance of ponderosa pine (Pinus ponderosa Laws. var. ponderosa) seedlings outplanted on two sites that varied in volumetric soil moisture content (θ), average temperature, and total precipitation (mesic and xeric). Seedlings in each container type were cultured specifically to achieve uniform seedling quality. After two growing seasons, seedlings planted at the mesic site showed high survival (>99%) and incremental growth gains of 147, 100, and 794% for height, root-collar diameter (RCD), and stem volume, respectively; container types exhibited differences in total height, RCD, and stem volume with larger containers generally yielding the largest seedlings. Seedlings planted at the xeric site experienced 83% survival, smaller growth gains (25, 46, and 220% for height, RCD, and stem volume, respectively), and also exhibited differences in height, RCD, and stem volume. Regression analysis revealed that for each site, initial seedling morphological characteristics were better at predicting absolute height, RCD and stem volume after the first year than after the second year, with initial seedling height offering the best predictive power (R 2=0.66, mesic site; and R 2=0.70, xeric site). Second-year absolute growth prediction was poorest on the mesic site (R 2<0.21). Regression analysis indicates that initial seedling characteristics lost predictive value with time, especially on the mesic site, as seedlings grew out of their initial, container-induced characteristics and become more limited by current environmental and genetic factors. Conversely, on a xeric site, where absolute growth was reduced, traits determined by the container type persisted longer. Selecting stocktypes for mesic site conditions may only be limited by the minimum growth gains desired. Conversely, xeric sites may benefit from deep-planted quality seedlings or carefully planted long-rooted, large container seedlings. © 2011 Elsevier B.V. Source

Pinto J.R.,U.S. Department of Agriculture | Marshall J.D.,University of Idaho | Dumroese R.K.,U.S. Department of Agriculture | Davis A.S.,University of Idaho | Cobos D.R.,Decagon Devices, Inc.
Canadian Journal of Forest Research | Year: 2012

Selecting the proper stock type for reforestation on dry sites can be critical for the long-term survival and growth of seedlings. In this study, we use a novel approach to understand stock type selection on a site where drought was induced with vegetative competition. Three ponderosa pine (Pinus ponderosa Lawson & C. Lawson var. ponderosa C. Lawson) seedling stock types were planted in the field and subjected to three levels of competition. Winter wheat (Triticum aestivum L. em.) was sown in three densities (0, 150, and 300 plants·m-2) and was successfully used as a model competitor to create drought conditions. High rates of net photosynthesis (A) indicated that seedlings with adequate soil moisture and without vegetative competition were established within three weeks. Conversely, low A, low soil moisture, and low predawn water potential measurements indicated that seedlings planted with vegetative competition were moisture-stressed and not established. Drought conditions created by the wheat caused 100% mortality among smaller stock types, whereas the largest stock type had a 63%-75% mortality rate. Measures of stable carbon isotopes showed stratification based on water availability, with significant d13C enrichment in competition treatments. Soil moisture is critical for seedlings to establish quickly after planting. Our data suggest that proper stock type selection on drought- or vegetation-prone sites can confer survival and growth benefits. Source

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