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Full-Text Articles in Engineering

Analyzing Large Workers’ Compensation Claims Using Generalized Linear Models And Monte Carlo Simulation, Fatemeh Davoudi Kakhki, Steven A. Freeman, Gretchen A. Mosher Dec 2018

Analyzing Large Workers’ Compensation Claims Using Generalized Linear Models And Monte Carlo Simulation, Fatemeh Davoudi Kakhki, Steven A. Freeman, Gretchen A. Mosher

Agricultural and Biosystems Engineering Publications

Insurance practitioners rely on statistical models to predict future claims in order to provide financial protection. Proper predictive statistical modeling is more challenging when analyzing claims with lower frequency, but high costs. The paper investigated the use of predictive generalized linear models (GLMs) to address this challenge. Workers’ compensation claims with costs equal to or more than US$100,000 were analyzed in agribusiness industries in the Midwest of the USA from 2008 to 2016. Predictive GLMs were built with gamma, Weibull, and lognormal distributions using the lasso penalization method. Monte Carlo simulation models were developed to check the performance ...


Micronutrient Availability In Alternative Foods During Agricultural Catastrophes, David C. Denkenberger, Joshua M. Pearce Oct 2018

Micronutrient Availability In Alternative Foods During Agricultural Catastrophes, David C. Denkenberger, Joshua M. Pearce

Department of Materials Science and Engineering Publications

Several catastrophes could block the sun, including asteroid/comet impact, super volcanic eruption, and nuclear war with the burning of cities (nuclear winter). Previous work has analyzed alternate food supplies (e.g., mushrooms growing on dead trees, bacteria growing on natural gas). This was shown to be technically capable of feeding everyone with macronutrients (protein, carbohydrates, and lipids) and minerals, although economics and politics remain uncertain. The present work analyzes vitamin availability in such alternative food scenarios. The vitamin content of various alternate foods is compared to the US recommended daily allowance (RDA) as well as the average requirement defined ...


Optimization Of Time-Weighted Average Air Sampling By Solid-Phase Microextraction Fibers Using Finite Element Analysis Software, Bulat Kenessov, Jacek A. Koziel, Nassiba Baimatova, Olga P. Demyanenko, Miras Derbissalin Oct 2018

Optimization Of Time-Weighted Average Air Sampling By Solid-Phase Microextraction Fibers Using Finite Element Analysis Software, Bulat Kenessov, Jacek A. Koziel, Nassiba Baimatova, Olga P. Demyanenko, Miras Derbissalin

Agricultural and Biosystems Engineering Publications

Determination of time-weighted average (TWA) concentrations of volatile organic compounds (VOCs) in air using solid-phase microextraction (SPME) is advantageous over other sampling techniques, but is often characterized by insufficient accuracies, particularly at longer sampling times. Experimental investigation of this issue and disclosing the origin of the problem is problematic and often not practically feasible due to high uncertainties. This research is aimed at developing the model of the TWA extraction process and optimization of TWA air sampling by SPME using finite element analysis software (COMSOL Multiphysics, Burlington, MA, USA). It was established that sampling by porous SPME coatings with high ...


Urban Agriculture And Small Farm Water Use: Case Studies And Trends From Cache Valley, Utah, Tyler Pratt, L. Niel Allen, David E. Rosenberg, Andrew A. Keller, Kelly Kopp Oct 2018

Urban Agriculture And Small Farm Water Use: Case Studies And Trends From Cache Valley, Utah, Tyler Pratt, L. Niel Allen, David E. Rosenberg, Andrew A. Keller, Kelly Kopp

Publications

The landscape of water in Utah is changing due to population growth, conversion of agricultural land to urban development, and increasing awareness of water scarcity. At the same time, Utah is experiencing a growing number of urban and small farms, but knowledge of water use in this sector is limited. Better understanding of what occurs at the field level on urban and small farms can aid state water use estimates and conservation efforts, and assist farmers in moving towards wiser water management. For the 2015 growing season, we performed irrigation evaluations for 24 urban and small farms in Cache Valley ...


Flexible Laser-Induced Graphene For Nitrogen Sensing In Soil, Nate T. Garland, Eric S. Mclamore, Nicholas D. Cavallaro, Deyny Mendivelso-Perez, Emily A. Smith, Dapeng Jing, Jonathan C. Claussen Oct 2018

Flexible Laser-Induced Graphene For Nitrogen Sensing In Soil, Nate T. Garland, Eric S. Mclamore, Nicholas D. Cavallaro, Deyny Mendivelso-Perez, Emily A. Smith, Dapeng Jing, Jonathan C. Claussen

Mechanical Engineering Publications

Flexible graphene electronics are rapidly gaining interest, but their widespread implementation has been impeded by challenges with ink preparation, ink printing, and post-print annealing processes. Laser-induced graphene (LIG) promises a facile alternative by creating flexible graphene electronics on polyimide substrates through a one-step laser writing fabrication method. Herein we demonstrate the use of LIG, created through a low-cost UV laser, for electrochemical ion selective sensing of plant-available nitrogen (i.e., both ammonium and nitrate ions: NH4+ and NO3-) in soil samples. The laser used to create the LIG was operated at distinct pulse rates (10, 20, 30, 40, and 50 ...


Spatial Structuring Of Cellulase Gene Abundance And Activity In Soil, Jinlyung Choi, Elizabeth Bach, Jaejin Lee, Jared Flater, Shane Dooley, Adina Howe, Kirsten S. Hofmockel Oct 2018

Spatial Structuring Of Cellulase Gene Abundance And Activity In Soil, Jinlyung Choi, Elizabeth Bach, Jaejin Lee, Jared Flater, Shane Dooley, Adina Howe, Kirsten S. Hofmockel

Agricultural and Biosystems Engineering Publications

Microbial mechanisms controlling cellulose degradation in soil habitats remains a critical knowledge gap in understanding and modeling terrestrial carbon-cycling. We investigated land management and soil micro-habitat influences on soil bacterial communities and distribution of cellulose-degrading enzyme genes in three bioenergy cropping systems (corn, prairie, and fertilized prairie). Within the soil, aggregates have been examined as potential micro- habitats with specific characteristics influencing resource partitioning and regulation, thus we also investigated genes associated with cellulose degradation within soil aggregate fractions from the fertilized prairie system. Soil bacterial communities and carbon-cycling gene presence varied across land management and soil microhabitats. Examination of ...


Deep Learning For Plant Stress Phenotyping: Trends And Future Perspectives, Asheesh Kumar Singh, Baskar Ganapathysubramanian, Soumik Sarkar, Arti Singh Oct 2018

Deep Learning For Plant Stress Phenotyping: Trends And Future Perspectives, Asheesh Kumar Singh, Baskar Ganapathysubramanian, Soumik Sarkar, Arti Singh

Agronomy Publications

Deep learning (DL), a subset of machine learning approaches, has emerged as a versatile tool to assimilate large amounts of heterogeneous data and provide reliable predictions of complex and uncertain phenomena. These tools are increasingly being used by the plant science community to make sense of the large datasets now regularly collected via high-throughput phenotyping and genotyping. We review recent work where DL principles have been utilized for digital image–based plant stress phenotyping. We provide a comparative assessment of DL tools against other existing techniques, with respect to decision accuracy, data size requirement, and applicability in various scenarios. Finally ...


A Novel Multirobot System For Plant Phenotyping, Tianshuang Gao, Hamid Emadi, Homagni Saha, Jiaoping Zhang, Alec Lofquist, Arti Singh, Baskar Ganapathysubramanian, Soumik Sarkar, Asheesh K. Singh, Sourabh Bhattacharya Sep 2018

A Novel Multirobot System For Plant Phenotyping, Tianshuang Gao, Hamid Emadi, Homagni Saha, Jiaoping Zhang, Alec Lofquist, Arti Singh, Baskar Ganapathysubramanian, Soumik Sarkar, Asheesh K. Singh, Sourabh Bhattacharya

Mechanical Engineering Publications

Phenotypic studies require large datasets for accurate inference and prediction. Collecting plant data in a farm can be very labor intensive and costly. This paper presents the design, architecture (hardware and software) and deployment of a multi-robot system for row crop field data collection. The proposed system has been deployed in a soybean research farm at Iowa State University.


An Assessment Of The Greatest Impacts On Distribution Uniformity For Drip And Micro Irrigation, Brooke Ashley Worden Sep 2018

An Assessment Of The Greatest Impacts On Distribution Uniformity For Drip And Micro Irrigation, Brooke Ashley Worden

Master's Theses and Project Reports

Using the Cal Poly Irrigation Training and Research Centers (ITRC) drip/micro evaluation program, global, or system, DUlq is computed by combining the component DUlq values of: pressure variation, uneven spacing between emitters, unequal drainage and “other” causes. “Other” causes include plugging, wear and manufacturing coefficient. The program also computes what percentage of the non-uniformity is due to each component. Burt (2004) showed that over 95% of the non-uniformity is due to “Other” causes and pressure differences. This thesis looks at what specifically in those components is driving the non-uniformity by analyzing various equipment and field practices and ...


Exploring Multiple Operating Scenarios To Identify Low-Cost, High Nitrate Removal Strategies For Electrically-Stimulated Woodchip Bioreactors, Ji-Yeow Law, Michelle L. Soupir, D. Raj Raman, Thomas Moorman Sep 2018

Exploring Multiple Operating Scenarios To Identify Low-Cost, High Nitrate Removal Strategies For Electrically-Stimulated Woodchip Bioreactors, Ji-Yeow Law, Michelle L. Soupir, D. Raj Raman, Thomas Moorman

Agricultural and Biosystems Engineering Publications

Woodchip bioreactors are recognized as an effective best management practice in the Iowa Nutrient Reduction Strategy. This edge-of-field practice intercepts and removes NO3-N, thereby reducing the NO3-N concentration in tile drainage before being discharged into surface water. Actual NO3-N load reductions realized by woodchip bioreactors are impacted by bioreactor size, hydraulic retention time (HRT), and denitrification efficiency. A typical woodchip bioreactor in Iowa may have 0.07% bioreactor area with respect to treatment area, 4–8 h HRT, and 43% mean denitrification efficiency. Here, we explored the potential of using electrically stimulated woodchip bioreactors to achieve greater NO3-N removal, and ...


Assessing Pathogen Presence In An Intensively Tile Drained, Agricultural Watershed, Elizabeth L. Rieke, Thomas Moorman, Michelle L. Soupir, F. Yang, Adina Howe Aug 2018

Assessing Pathogen Presence In An Intensively Tile Drained, Agricultural Watershed, Elizabeth L. Rieke, Thomas Moorman, Michelle L. Soupir, F. Yang, Adina Howe

Agricultural and Biosystems Engineering Publications

Increases in swine production and concomitant manure application provide beneficial nutrients for crops but also include the potential to spread pathogenic bacteria in the environment. While manure is known to contain a variety of pathogens, little is known regarding the long-term effect of manure application on fate and transport of this diverse set of pathogens into surrounding waterways. We report on the use of 16S-rRNA gene sequencing to detect pathogen-containing genera in the agriculturally dominated South Fork Iowa River watershed, home to approximately 840,000 swine in the 76,000-ha basin. DNA was extracted from monthly grab samples collected from ...


Social Issues In Nonmetropolitan Nebraska: Perceptions Of Social Stigma And Drug And Alcohol Abuse: 2018 Nebraska Rural Poll Results, Rebecca J. Vogt, Cheryl A. Burkhart-Kriesel, Randolph L. Cantrell, Bradley Lubben, L. J. Mcelravy, Timothy L. Meyer Aug 2018

Social Issues In Nonmetropolitan Nebraska: Perceptions Of Social Stigma And Drug And Alcohol Abuse: 2018 Nebraska Rural Poll Results, Rebecca J. Vogt, Cheryl A. Burkhart-Kriesel, Randolph L. Cantrell, Bradley Lubben, L. J. Mcelravy, Timothy L. Meyer

Publications of the Rural Futures Institute

Conclusion

Many rural Nebraskans think it brings shame upon a person to do the following: file personal bankruptcy, apply for food stamps and apply for income assistance. Most rural Nebraskans disagree that the following items bring shame to a person: go to Alcoholics Anonymous or other alcohol treatment, seek mental health care, and go to drug treatment. In general, rural Nebraskans say that residents of their community are more likely than they personally are to think doing the items brings shame upon a person.

At least one-third of rural Nebraskans think the following are a very serious problem or a ...


Irrigation Management, Environment, And Profits: Who Wins?, Emily O'Donnell Jul 2018

Irrigation Management, Environment, And Profits: Who Wins?, Emily O'Donnell

Dissertations and Theses in Agricultural Economics

The impact of irrigation technology on farmers’ management strategies and resulting environmental benefits depends upon agronomic properties and market forces. We evaluate the role of deficit irrigation using soil moisture probe technology on corn yield and evapotranspiration, which is a measure of water use efficiency. Evapotranspiration represents the water that transits through the plant during planting to harvest (transpiration) and the evaporation from the soil into the environment, or the displaced water in the production process. We develop yield and evapotranspiration response functions to inform a constrained profit maximization model used to identify the optimal irrigation level across a variety ...


Plant Community Composition, Floristic Quality, And Establishment Of Roadside Revegetation In Nebraska, Usa., Jonathan M. Soper Jul 2018

Plant Community Composition, Floristic Quality, And Establishment Of Roadside Revegetation In Nebraska, Usa., Jonathan M. Soper

Theses, Dissertations, and Student Research in Agronomy and Horticulture

Roadside revegetation poses a challenge and opportunity for biodiversity conservation, as the land area occupied by roadsides is not expected to decline in the future. In the context of roadside revegetation activities in rural regions dominated by agricultural land uses, revegetation efforts can establish plant communities that offer unique species that would otherwise be absent on the landscape. To determine the efficacy of roadside revegetation efforts in 1) providing plant communities of high biodiversity value and 2) meeting the expectations of roadside revegetation managers for establishment, we quantified botanical composition, floristic quality, and success in seeding efforts to meet manager ...


Water And Sediment Microbial Quality Of Mountain And Agricultural Streams, Pramod Pandey, Michelle L. Soupir, Yi Wang, Wenlong Cao, Sagor Biswas, Venkata Vaddella, Robert Atwill, Venkatesh Merwade, Gregory Pasternack Jul 2018

Water And Sediment Microbial Quality Of Mountain And Agricultural Streams, Pramod Pandey, Michelle L. Soupir, Yi Wang, Wenlong Cao, Sagor Biswas, Venkata Vaddella, Robert Atwill, Venkatesh Merwade, Gregory Pasternack

Agricultural and Biosystems Engineering Publications

Increased public health risk caused by pathogen contamination in streams is a serious issue, and mitigating the risk requires improvement in existing microbial monitoring of streams. To improve understanding of microbial contamination in streams, we monitored Escherichia coli in stream water columns and streambed sediment. Two distinct streams and their subwatersheds were studied: (i) a mountain stream (Merced River, California), which represents pristine and wild conditions, and (ii) an agricultural stream (Squaw Creek, Iowa), which represents an agricultural setting (i.e., crop, manure application, cattle access). Stream water column and sediment samples were collected in multiple locations in the Merced ...


Economic Development In Nonmetropolitan Nebraska: Internet Use, Nature-Based Tourism, Federal Tax Policy And Workforce Development: 2018 Nebraska Rural Poll Results, Rebecca J. Vogt, Cheryl A. Burkhart-Kriesel, Randolph L. Cantrell, Bradley Lubben, L. J. Mcelravy, Timothy L. Meyer Jul 2018

Economic Development In Nonmetropolitan Nebraska: Internet Use, Nature-Based Tourism, Federal Tax Policy And Workforce Development: 2018 Nebraska Rural Poll Results, Rebecca J. Vogt, Cheryl A. Burkhart-Kriesel, Randolph L. Cantrell, Bradley Lubben, L. J. Mcelravy, Timothy L. Meyer

Publications of the Rural Futures Institute

Conclusion

The proportion of rural Nebraskans accessing the Internet using their cell phone has increased compared to two years ago. But, the proportion subscribing to high-speed Internet service at home remained stable during the past two years. Persons living in or near the smallest communities are less likely than persons living in or near larger communities to have high-speed Internet service at home.

Not many rural Nebraskans report significant limitations from their home Internet service on their ability to do most tasks. At least one in ten report being limited significantly or not being able to play real time video ...


Smart Vertical Farm System (Svfs), Sarasit Sirawattanakul Jun 2018

Smart Vertical Farm System (Svfs), Sarasit Sirawattanakul

The International Student Science Fair 2018

The unremitting trends of increasing population, urbanization, diminishing water supply, and continuing climate change have contributed to declining stocks of arable land per person. Land available for farming is shrinking, and the demand for food is growing. All of these lead to food insecurity. For the first version of Smart Vertical Farm System is designed to increase food productions by an automatic system. It built with shelves which support soil and hydroponic system, stacked vertically. The system first shovels the soil in the tray and sews the seeds. There is also additional watering system. The hydroponic parts are on the ...


Smart Vertical Farm System (Svfs), Sarasit Sirawattanakul Jun 2018

Smart Vertical Farm System (Svfs), Sarasit Sirawattanakul

The International Student Science Fair 2018

The unremitting trends of increasing population, urbanization, diminishing water supply, and continuing climate change have contributed to declining stocks of arable land per person. Land available for farming is shrinking, and the demand for food is growing. All of these lead to food insecurity. For the first version of Smart Vertical Farm System is designed to increase food productions by an automatic system. It built with shelves which support soil and hydroponic system, stacked vertically. The system first shovels the soil in the tray and sews the seeds. There is also additional watering system. The hydroponic parts are on the ...


A Deep Learning Framework To Discern And Count Microscopic Nematode Eggs, Adedotun Akintayo, Gregory L. Tylka, Asheesh K. Singh, Baskar Ganapathysubramanian, Arti Singh, Soumik Sarkar Jun 2018

A Deep Learning Framework To Discern And Count Microscopic Nematode Eggs, Adedotun Akintayo, Gregory L. Tylka, Asheesh K. Singh, Baskar Ganapathysubramanian, Arti Singh, Soumik Sarkar

Plant Pathology and Microbiology Publications

In order to identify and control the menace of destructive pests via microscopic image-based identification state-of-the art deep learning architecture is demonstrated on the parasitic worm, the soybean cyst nematode (SCN), Heterodera glycines. Soybean yield loss is negatively correlated with the density of SCN eggs that are present in the soil. While there has been progress in automating extraction of egg-filled cysts and eggs from soil samples counting SCN eggs obtained from soil samples using computer vision techniques has proven to be an extremely difficult challenge. Here we show that a deep learning architecture developed for rare object identification in ...


Evaluation Of Annagnps For Simulating The Inundation Of Drained And Farmed Potholes In The Prairie Pothole Region Of Iowa, Pawan Upadhyaya, L. O. S. Pruski, Amy Kaleita, Michelle L. Soupir May 2018

Evaluation Of Annagnps For Simulating The Inundation Of Drained And Farmed Potholes In The Prairie Pothole Region Of Iowa, Pawan Upadhyaya, L. O. S. Pruski, Amy Kaleita, Michelle L. Soupir

Agricultural and Biosystems Engineering Publications

Closed surface depressions, also known as “potholes” play an important role in the hydrologic cycle and provide multiple environmental services including flood mitigation, water quality improvements and wildlife habitat. In the Prairie Pothole Region, which covers approximately 715,000 km2, including parts of three Canadian provinces (Saskatchewan, Manitoba, and Alberta) and five states in the U.S. (Minnesota, Iowa, North and South Dakota, and Montana), these potholes are typically farmed and are a dominant feature in the landscape. In this study, we evaluate the Annualized Agriculture Non-Point Source (AnnAGNPS) model for simulating the inundation behavior of two farmed potholes, termed ...


Integrating Genotype And Weather Variables For Soybean Yield Prediction Using Deep Learning, Johnathon Shook, Linjiang Wu, Tryambak Gangopadhyay, Baskar Ganapathysubramanian, Soumik Sarkar, Asheesh K. Singh May 2018

Integrating Genotype And Weather Variables For Soybean Yield Prediction Using Deep Learning, Johnathon Shook, Linjiang Wu, Tryambak Gangopadhyay, Baskar Ganapathysubramanian, Soumik Sarkar, Asheesh K. Singh

Agronomy Publications

Realized performance of complex traits is dependent on both genetic and environmental factors, which can be difficult to dissect due to the requirement for multiple replications of many genotypes in diverse environmental conditions. To mediate these problems, we present a machine learning framework in soybean (Glycine max (L.) Merr.) to analyze historical performance records from Uniform Soybean Tests (UST) in North America, with an aim to dissect and predict genotype response in multiple envrionments leveraging pedigree and genomic relatedness measures along with weekly weather parameters. The ML framework of Long Short Term Memory - Recurrent Neural Networks works by isolating key ...


Radical Social Ecology As Deep Pragmatism: A Call To The Abolition Of Systemic Dissonance And The Minimization Of Entropic Chaos, Arielle Brender May 2018

Radical Social Ecology As Deep Pragmatism: A Call To The Abolition Of Systemic Dissonance And The Minimization Of Entropic Chaos, Arielle Brender

Student Theses 2015-Present

This paper aims to shed light on the dissonance caused by the superimposition of Dominant Human Systems on Natural Systems. I highlight the synthetic nature of Dominant Human Systems as egoic and linguistic phenomenon manufactured by a mere portion of the human population, which renders them inherently oppressive unto peoples and landscapes whose wisdom were barred from the design process. In pursuing a radical pragmatic approach to mending the simultaneous oppression and destruction of the human being and the earth, I highlight the necessity of minimizing entropic chaos caused by excess energy expenditure, an essential feature of systems that aim ...


Modelling The Influence Of Crop Density And Weather Conditions On Field Drying Characteristics Of Switchgrass And Maize Stover Using Random Forest, Amit Khanchi, Stuart J. Birrell, Robert B. Mitchell May 2018

Modelling The Influence Of Crop Density And Weather Conditions On Field Drying Characteristics Of Switchgrass And Maize Stover Using Random Forest, Amit Khanchi, Stuart J. Birrell, Robert B. Mitchell

Agricultural and Biosystems Engineering Publications

Field drying trials were conducted using both field baskets as well as grab sampling techniques to study drying behaviour of switchgrass and maize (corn) stover (CS). Environmental conditions such as hourly solar radiation, vapour pressure deficit (VPD), average wind speed, rainfall amount, harvesting method, and field operations such as swath density were used as variables for model development. A powerful classification-based algorithm, which uses a collection of decision trees called random forest (RF) was utilised to predict moisture content (MC) of switchgrass and CS on wet basis. RF predicted the MC of switchgrass and CS with a coefficient of determination ...


Explaining Hyperspectral Imaging Based Plant Disease Identification: 3d Cnn And Saliency Maps, Koushik Nagasubramanian, Sarah Jones, Asheesh K. Singh, Arti Singh, Baskar Ganapathysubramanian, Soumik Sarkar Apr 2018

Explaining Hyperspectral Imaging Based Plant Disease Identification: 3d Cnn And Saliency Maps, Koushik Nagasubramanian, Sarah Jones, Asheesh K. Singh, Arti Singh, Baskar Ganapathysubramanian, Soumik Sarkar

Agronomy Publications

Our overarching goal is to develop an accurate and explainable model for plant disease identification using hyperspectral data. Charcoal rot is a soil borne fungal disease that affects the yield of soybean crops worldwide. Hyperspectral images were captured at 240 different wavelengths in the range of 383 - 1032 nm. We developed a 3D Convolutional Neural Network model for soybean charcoal rot disease identification. Our model has classification accuracy of 95.73\% and an infected class F1 score of 0.87. We infer the trained model using saliency map and visualize the most sensitive pixel locations that enable classification. The sensitivity ...


Kinetic Modeling Of Corn Fermentation With S. Cerevisiae Using A Variable Temperature Strategy, Augusto C. M. Souza, Mohammad Mousaviraad, Kenneth O. M. Mapoka, Kurt A. Rosentrater Apr 2018

Kinetic Modeling Of Corn Fermentation With S. Cerevisiae Using A Variable Temperature Strategy, Augusto C. M. Souza, Mohammad Mousaviraad, Kenneth O. M. Mapoka, Kurt A. Rosentrater

Agricultural and Biosystems Engineering Publications

While fermentation is usually done at a fixed temperature, in this study, the effect of having a controlled variable temperature was analyzed. A nonlinear system was used to model batch ethanol fermentation, using corn as substrate and the yeast Saccharomyces cerevisiae, at five different fixed and controlled variable temperatures. The lower temperatures presented higher ethanol yields but took a longer time to reach equilibrium. Higher temperatures had higher initial growth rates, but the decay of yeast cells was faster compared to the lower temperatures. However, in a controlled variable temperature model, the temperature decreased with time with the initial value ...


Rapid Needs Assessment And Response Technique, Jacqueline Comito, Brandy Case Haub, Mark Licht Apr 2018

Rapid Needs Assessment And Response Technique, Jacqueline Comito, Brandy Case Haub, Mark Licht

Agronomy Publications

The rapid needs assessment and response technique (RNR) is a useful tool for Extension professionals seeking ways to improve workshop structure. Facilitators using RNR organize workshop participants in small groups and then rotate the groups through a series of stations where participants dialogue on questions central to the workshop topic. The technique helps adult learners actively engage with one another, thus improving their ability to learn the subject matter. Use of RNR also allows facilitators to understand participants' existing knowledge of a workshop topic and tailor their education to participants' specific questions and needs.


Functional Trait Differences Between Native Bunchgrasses And The Invasive Grass Bromus Tectorum, Huiqin H.E., Thomas A. Monaco, Thomas A. Jones Mar 2018

Functional Trait Differences Between Native Bunchgrasses And The Invasive Grass Bromus Tectorum, Huiqin H.E., Thomas A. Monaco, Thomas A. Jones

Forage and Range Research Laboratory Publications

We conducted 30- and 60-d greenhouse experiments to compare functional traits of Bromus tectorum (invasive annual grass) and four perennial bunchgrasses under well-watered or drought conditions. Even under drought, B. tectorum experienced significantly less stress (i.e., higher xylem pressure potential and greater shoot water content, water use per day and water-use efficiency) and biomass production than the perennial grasses after 30 d. However, after 60 d, its superiority was reduced under infrequent watering. Differences among perennial grasses were more pronounced for physiological traits under infrequent watering and for morphological traits under frequent watering. Elymus multisetus (fastgrowing species) had a ...


Determination Of Selected Aromas In Marquette And Frontenac Wine Using Headspace-Spme Coupled With Gc-Ms And Simultaneous Olfactometry, Somchai Rice, Nanticha Lutt, Jacek A. Koziel, Murlidhar Dharmadhikari, Anne Fennell Mar 2018

Determination Of Selected Aromas In Marquette And Frontenac Wine Using Headspace-Spme Coupled With Gc-Ms And Simultaneous Olfactometry, Somchai Rice, Nanticha Lutt, Jacek A. Koziel, Murlidhar Dharmadhikari, Anne Fennell

Agricultural and Biosystems Engineering Publications

Understanding the aroma profile of wines made from cold climate grapes is needed to help winemakers produce quality aromatic wines. The current study aimed to add to the very limited knowledge of aroma-imparting compounds in wines made from the lesser-known Frontenac and Marquette cultivars. Headspace solid-phase microextraction (SPME) and gas chromatography-mass spectrometry (GC-MS) with simultaneous olfactometry was used to identify and quantify selected, aroma-imparting volatile organic compounds (VOC) in wines made from grapes harvested at two sugar levels (22° Brix and 24° Brix). Aroma-imparting compounds were determined by aroma dilution analysis (ADA). Odor activity values (OAV) were also used to ...


Impact Of Temperature And Hydraulic Retention Time On Pathogen And Nutrient Removal In Woodchip Bioreactors, Michelle L. Soupir, Natasha L. Hoover, Thomas B. Moorman, Ji Yeow Law, Bradley L. Bearson Mar 2018

Impact Of Temperature And Hydraulic Retention Time On Pathogen And Nutrient Removal In Woodchip Bioreactors, Michelle L. Soupir, Natasha L. Hoover, Thomas B. Moorman, Ji Yeow Law, Bradley L. Bearson

Agricultural and Biosystems Engineering Publications

Woodchip denitrification bioreactors are an important edge-of-field practice for treating agricultural drainage; however, their ability to filter microbial pollutants has primarily been explored in the context of wastewater treatment. Upflow column reactors were constructed and tested for E. coli, Salmonella, NO3-N, and dissolved reactive phosphorus (DRP) at hydraulic retention times (HRTs) of 12 and 24 h and at controlled temperatures of 10 and 21.5 °C. Influent solution was spiked to 30 mg L−1 NO3-N, 2–8 × 105 E. coli and Salmonella, and 0.1 mg L−1 DRP. Microbial removal was consistently observed with removal ranging from 75 ...


Safety Videos For Major Shop Equipment In Cal Poly Brae Lab 1, Trey Joseph Johnston Mar 2018

Safety Videos For Major Shop Equipment In Cal Poly Brae Lab 1, Trey Joseph Johnston

Agricultural Education and Communication

At California Polytechnic State University, San Luis Obispo, students from all majors can take a variety of classes in the BioResource and Agriculture Engineering Department (BRAE). It is essential for future high school mechanics educators to learn the basic shop tools and the importance of safety in the laboratory. In shop 1 of the BRAE Department, there are many different tools students will find in a mechanics classroom. The five main power tools are the Table Saw, Drill Press, Bench Grinder, Radial Arm Saw, and Disk/Belt Sander.

In BRAE 121 Agricultural Mechanics, students learn basic shop skills about lab ...