Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Physical Sciences and Mathematics (8515)
- Engineering (2548)
- Education (2292)
- Computer Sciences (1948)
- Social and Behavioral Sciences (1803)
-
- Environmental Sciences (1444)
- Physics (1217)
- Life Sciences (1213)
- Chemistry (1111)
- Arts and Humanities (1011)
- Earth Sciences (988)
- Mathematics (840)
- Law (691)
- Medicine and Health Sciences (684)
- Electrical and Computer Engineering (655)
- Oceanography and Atmospheric Sciences and Meteorology (554)
- Computer Engineering (534)
- Business (504)
- Higher Education (437)
- Science and Mathematics Education (421)
- Mechanical Engineering (406)
- Statistics and Probability (382)
- Astrophysics and Astronomy (352)
- Educational Administration and Supervision (301)
- Civil and Environmental Engineering (300)
- Geology (285)
- Natural Resources and Conservation (283)
- Teacher Education and Professional Development (277)
- History (273)
- Educational Assessment, Evaluation, and Research (272)
- Institution
-
- University of Nebraska - Lincoln (1091)
- University of South Florida (535)
- Utah State University (428)
- Louisiana State University (398)
- Wright State University (389)
-
- TÜBİTAK (387)
- Brigham Young University (373)
- Singapore Management University (373)
- California Polytechnic State University, San Luis Obispo (369)
- Missouri University of Science and Technology (337)
- Old Dominion University (326)
- Purdue University (324)
- Clemson University (303)
- University of Nevada, Las Vegas (277)
- Georgia Southern University (269)
- University of Central Florida (254)
- University of Texas at El Paso (254)
- University of Kentucky (227)
- University of Arkansas, Fayetteville (213)
- Nova Southeastern University (211)
- Portland State University (206)
- Wayne State University (200)
- Air Force Institute of Technology (197)
- Technological University Dublin (187)
- Edith Cowan University (180)
- Virginia Commonwealth University (170)
- San Jose State University (169)
- City University of New York (CUNY) (166)
- University of Northern Iowa (164)
- University of New Mexico (160)
- Keyword
-
- Education (210)
- Mathematics (135)
- Climate change (84)
- Applied sciences (78)
- Higher education (78)
-
- Georgia Southern University (71)
- Student newspaper (70)
- Engineering (66)
- Simulation (64)
- Optimization (60)
- Sustainability (59)
- Newspaper (58)
- Science (58)
- Technology (58)
- 2012 (56)
- Research (54)
- Physics (52)
- United States (52)
- Statistics (50)
- Curriculum (49)
- Remote sensing (49)
- Assessment (48)
- Education, General (48)
- Newsletter (48)
- Academic achievement (47)
- Teaching (47)
- History (45)
- Pure sciences (45)
- Student achievement (45)
- Chemistry (44)
- Publication
-
- Theses and Dissertations (717)
- Electronic Theses and Dissertations (370)
- Faculty Publications (301)
- Research Collection School Of Computing and Information Systems (295)
- Dissertations (256)
-
- USF Tampa Graduate Theses and Dissertations (171)
- Computer Science & Engineering Syllabi (164)
- Theses (156)
- Studia UBB Geologia (145)
- International Congress on Environmental Modelling and Software (144)
- Master's Theses (143)
- Graduate Theses and Dissertations (132)
- UNLV Theses, Dissertations, Professional Papers, and Capstones (130)
- Open Access Theses & Dissertations (127)
- Masters Theses (119)
- LSU Master's Theses (116)
- Articles (110)
- LSU Doctoral Dissertations (109)
- Student Works (2010-2019) (106)
- Applied Mathematics & Information Sciences (105)
- Turkish Journal of Electrical Engineering and Computer Sciences (101)
- Doctoral Dissertations (100)
- Publications (97)
- Publications and Research (96)
- All Graduate Theses and Dissertations, Spring 1920 to Summer 2023 (95)
- Browse all Theses and Dissertations (93)
- Nebraska Tractor Tests (91)
- All Dissertations (86)
- All Theses (86)
- Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions) (84)
- Publication Type
- File Type
Articles 16411 - 16440 of 19479
Full-Text Articles in Entire DC Network
Late Cretaceous-Eocene Geological Evolution Of The Pontides Based On New Stratigraphic And Palaeontologic Data Between The Black Sea Coast And Bursa (Nw Turkey), Zahi̇de Özcan, Aral Okay, Ercan Özcan, Aynur Hakyemez, Sevi̇nç Altiner
Late Cretaceous-Eocene Geological Evolution Of The Pontides Based On New Stratigraphic And Palaeontologic Data Between The Black Sea Coast And Bursa (Nw Turkey), Zahi̇de Özcan, Aral Okay, Ercan Özcan, Aynur Hakyemez, Sevi̇nç Altiner
Turkish Journal of Earth Sciences
The Late Cretaceous-Eocene geological evolution of northwest Turkey between the Black Sea and Bursa was studied through detailed biostratigraphic characterization of eleven stratigraphic sections. The Upper Cretaceous sequence in the region starts with a major marine transgression and lies unconformably on a basement of Palaeozoic and Triassic rocks in the north (İstanbul-type basement) and on metamorphic rocks and Jurassic sedimentary rocks in the south (Sakarya-type basement). Four megasequences have been differentiated in the Late Cretaceous-Eocene interval. The first one, of Turonian to Late Campanian age, is represented by volcanic and volcanoclastic rocks in the north along the Black Sea coast, …
The Unaz Formation: A Key Unit In The Western Black Sea Region, N Turkey, Okan Tüysüz, İsmai̇l Ömer Yilmaz, Lilian Svabenicka, Sabri̇ Ki̇ri̇ci̇
The Unaz Formation: A Key Unit In The Western Black Sea Region, N Turkey, Okan Tüysüz, İsmai̇l Ömer Yilmaz, Lilian Svabenicka, Sabri̇ Ki̇ri̇ci̇
Turkish Journal of Earth Sciences
The Pontide magmatic belt in the Western Pontides, which developed in response to the northward subduction of the northern branches of the Tethys Ocean, consists of two different volcanic successions separated by an Upper Santonian pelagic limestone unit, the Unaz Formation. The first period of volcanism and associated sedimentation started during the Middle Turonian and lasted until the Early Santonian under the control of an extensional tectonic regime, which created horst-graben topography along the southern Black Sea region. The lower volcanic succession, the Dereköy Formation, was deposited mainly within these grabens. This extensional period probably represents the rifting of magmatic …
Testing Alternative Tectono-Stratigraphic Interpretations Of The Late Palaeozoic−Early Mesozoic Karakaya Complex In Nw Turkey: Support For An Accretionary Origin Related To Northward Subduction Of Palaeotethys, Alastair Robertson, Ti̇mur Ustaömer
Testing Alternative Tectono-Stratigraphic Interpretations Of The Late Palaeozoic−Early Mesozoic Karakaya Complex In Nw Turkey: Support For An Accretionary Origin Related To Northward Subduction Of Palaeotethys, Alastair Robertson, Ti̇mur Ustaömer
Turkish Journal of Earth Sciences
Lower Carboniferous-Upper Triassic rocks of the Karakaya Complex exposed E-W across Turkey are critical to reconstructions of Palaeotethys in the Eastern Mediterranean region. Despite decades of research, the origin and emplacement of the Karakaya Complex remains controversial because it is mapped either as an overall stratigraphic succession of sedimentary olistostromes or as a stack of thrust sheets and mélange. Tectonic models include a continental rift, a back-arc rift, a marginal oceanic basin, and an accretionary prism formed by subduction of a wide ocean. Subduction is seen as either northwards or southwards. To test the alternatives, the various litho-tectonic units and …
Petrogenesis Of Late Cretaceous Adakitic Magmatism In The İstanbul Zone (Çavuşbaşı Granodiorite, Nw Turkey), Sabah Yilmaz Şahi̇n, Namik Aysal, Yildirim Güngör
Petrogenesis Of Late Cretaceous Adakitic Magmatism In The İstanbul Zone (Çavuşbaşı Granodiorite, Nw Turkey), Sabah Yilmaz Şahi̇n, Namik Aysal, Yildirim Güngör
Turkish Journal of Earth Sciences
The Çavuşbaşı granodiorite intrudes Ordovician sedimentary rocks in the western part of the İstanbul Zone (NW Turkey). The intrusion is made up mainly of granodiorite, and subordinate tonalite and quartz diorite, and has a granular texture and some special mixing textures such as antirapakivi, blade-shaped biotite, acicular apatite, spongy cellular dissolution/melting plagioclase textures. The main mafic minerals are hornblende and biotite. U-Pb in-situ dating of zircons from two samples via SHRIMP yielded weighted age values of ~68 Ma, suggesting emplacement during the Late Cretaceous. Geochemically the Çavuşbaşı granodiorite resembles adakites with high Sr/Y and La/Yb ratios, low Y and HREE …
Sources Of Salinization Of The Baton Rouge Aquifer System: Southeastern Louisiana, Callie Elizabeth Anderson
Sources Of Salinization Of The Baton Rouge Aquifer System: Southeastern Louisiana, Callie Elizabeth Anderson
LSU Master's Theses
A major environmental and economic problem confronting the Baton Rouge area, southeastern Louisiana, is the progressive salinization of the Baton Rouge aquifer system, an important source of fresh municipal and industrial groundwater. The Baton Rouge fault marks a boundary between fresh groundwaters to the north and predominately brackish waters to the south. Determining the permeability architecture of the fault is an essential component of modeling groundwater flow and saline contamination north of the fault. Understanding the sources and pathways of the saline waters that are migrating into the freshwater sands north of the fault is thus essential in helping to …
Modeling Of Dynamics Of Gyroscopic Systems, Siddharth Sharma
Modeling Of Dynamics Of Gyroscopic Systems, Siddharth Sharma
LSU Master's Theses
The amplitude of vibrations of a rotating system operating near or at its critical speed grows without bound. This poses a serious problem for the rotating machinery industry from the perspective of design, maintenance, vibration troubleshooting and stability of the rotating equipments.
In this thesis, we wish to develop an exact method of analysis for the system of a mass-less symmetrical shaft rotating in symmetrical bearings (SSSB) with finite displacement at bearing end. The method so developed is expected to be extended to the SSSB model of a shaft having mass. The stability analysis is performed for both the systems. …
Developing A Stem Education For Rural Elementary Students, Lisa J. Chizek
Developing A Stem Education For Rural Elementary Students, Lisa J. Chizek
Graduate Research Papers
With his launch of "Educate to Innovate" in 2009, President Barack Obama stated, "Reaffirming and strengthening America's role as the world's engine of scientific discovery and technological innovation is essential to meeting the challenges of this century," said President Obama. "That's why I am committed to making the improvement of STEM education over the next decade a national priority" (The White House, 2009).
Misconceptions In Science Education, Angela Francis
Misconceptions In Science Education, Angela Francis
Graduate Research Papers
Like many science teachers today, I am a constructivist. I believe that students need to be active constructors of their own knowledge. I also understand that, prior to entering my classroom, students have had innumerable experiences that have led them to develop their own unique understanding of the natural world. This reality has certain advantages and disadvantages. One critical disadvantage is that students' prior knowledge and common-sense understandings about science can be at odds with the nature of science that is generally accepted within the scientific community. In order to be an effective teacher, I must identify and understand the …
Emphasizing Project Based Curriculum In Principles Of Engineering - A Project Lead The Way Course, Pamela Rae Baier Hartman
Emphasizing Project Based Curriculum In Principles Of Engineering - A Project Lead The Way Course, Pamela Rae Baier Hartman
Graduate Research Papers
The current trend in education is for more Science, Technology, Engineering, and Math, or STEM based curriculum. STEM occupations are critical to Iowa's economic competitiveness because of the direct ties to innovation, productivity and economic growth. On September 6, 2011 Iowa's Governor, Terry Branstad, announced the members who will serve on the Governor's STEM Advisory Council. This group was created to advise the Governor's office on ways to improve STEM education, STEM innovation and economic development. The new council, along with the 6 regional STEM hubs, will work to grow Iowa's commitment to bolstering STEM education, STEM innovation and to …
Forensic Science: An Applied Chemistry Single Semester Course, Theresa A. Theis
Forensic Science: An Applied Chemistry Single Semester Course, Theresa A. Theis
Graduate Research Papers
No abstract provided.
Professional Development For The Library Para Educator: Developing A Guide To Answer Questions About School Libraries In The 21st Century, Tifini Foglesong
Professional Development For The Library Para Educator: Developing A Guide To Answer Questions About School Libraries In The 21st Century, Tifini Foglesong
Graduate Research Papers
The purpose of this project was to create a manual for new and existing library paraprofessionals as well as administrators who coordinate teacher librarian professional inservice days. This information will provide content for library paraprofessionals to understand both the procedures and principles of school libraries.
Boy's Recreational Reading In A One-To-One Computer School, Michaela Seeman
Boy's Recreational Reading In A One-To-One Computer School, Michaela Seeman
Graduate Research Papers
High school boys are often not motivated to read when required, let alone read for enjoyment. With the use of advanced technology provided through a one-to-one computer educational setting and resources, high school boys may have a different approach and attitude to reading for enjoyment.
The purpose of this study was to examine what high school boys chose to read, print and electronic, for enjoyment in an Iowa one-to-one computer educational setting. The questions asked in this research study included:
1. What topics do high school boys spend time investigating? What resources do they use?
2. How do high school …
Parental Perspective On Technology Integration In Pk-2 In A Rural Community School, Stephanie L. Callan
Parental Perspective On Technology Integration In Pk-2 In A Rural Community School, Stephanie L. Callan
Graduate Research Papers
This study investigated parental perspectives of PK-2 classroom technology integration and parental familiarity with 21st Century Skills and their importance in their children's education and future success in a global economy. Through this descriptive study the researcher used mixed-methods of a survey and semi-structured interview to gather information from parents in a small, rural school in southeastern Iowa. The research found that parents of this age group do place value on technology integration as it relates to both their children's academic and future success. Most parents of this age group working outside of an educational setting were unaware of what …
Numerical Study Of Laterally Loaded Batter Pile Groups With The Application Of Anisotropic Modified Cam-Clay Model, Yida Zhang
LSU Master's Theses
This study presents a series of numerical studies of laterally loaded batter pile groups based on data of the full-scale lateral load test on M19 eastbound pier foundation of the new I-10 Twin Span Bridge, Louisiana. The numerical studies include several continuum-based 3D finite element analyses on batter/vertical pile/pile groups and a FB-MultiPier analysis of the pile foundation. The Anisotropic Modified Cam Clay Model, has been implemented into UMAT and applied for describing clay behavior in all FE models. The explicit substepping scheme with modified Euler algorithm is selected to implement the model in ABAQUS software. The resultant UMAT shows …
Pretesting In Science: Effect On Unit Test Scores, Mary Catherine Johnson
Pretesting In Science: Effect On Unit Test Scores, Mary Catherine Johnson
LSU Master's Theses
ABSTRACT This study examines the effect that pretesting has on unit test scores in a high school Biology I classroom. The experimental classes were given a pretest before four units of curriculum and then taught the concepts of these units with a traditional lecture based methodology. Their unit test scores were compared to a control class that did not take pretests before the units. In addition, the End of Course (EOC) test scores of the control and experimental classes were compared to determine if pretesting improved transfer of knowledge to a different type of test. Pretesting did not cause a …
School Libraries: Developing A Valuable Resource For Gifted Learners, Corinn K. Matheson
School Libraries: Developing A Valuable Resource For Gifted Learners, Corinn K. Matheson
Graduate Research Papers
This study surveys the teacher librarians, Extended Learning Program teachers, and instructional coaches in a Midwest suburban school district's elementary and middle schools. The purpose is to determine what, if any, changes are needed to better meet the needs of the district's gifted population. Seventeen (77%) of the twenty-two anonymous surveys were completed. Six ELP instructors responded (100%), five teacher librarians responded (63%), and six instruction coaches responded (75%). A qualitative analysis of six open-ended survey questions was used to evaluate respondents' answers. The questions referred both to current practices as well as suggested strategies. The results showed that while …
Standardized Precipitation Index: User Guide, Mark Svoboda, Michael Hayes, Deborah Wood
Standardized Precipitation Index: User Guide, Mark Svoboda, Michael Hayes, Deborah Wood
National Drought Mitigation Center: Faculty Publications
Over the years, there has been much discussion on what drought indices should be used in a particular climate and for what application. Many drought definitions and indices have been developed and attempts have been made to provide some guidance on this issue. With this in mind, the Interregional Workshop on Indices and Early Warning Systems for Drought was organized and held at the University of Nebraska-Lincoln, United States of America, from 8 to 11 December 2009. It was jointly sponsored by the School of Natural Resources (SNR) of the University of Nebraska, the United States National Drought Mitigation Center …
Multipayload Interferometric Wave Vector Determination Of Auroral Hiss, E. T. Lundberg, P. M. Kintner, S. P. Powell, Kristina A. Lynch
Multipayload Interferometric Wave Vector Determination Of Auroral Hiss, E. T. Lundberg, P. M. Kintner, S. P. Powell, Kristina A. Lynch
Dartmouth Scholarship
We extend traditional, single payload, interferometric techniques to a multiple payload sounding rocket mission, and apply these techniques to measure the parallel and perpendicular wavelength of auroral VLF hiss from 8 kHz–20 kHz. We model the wavelength distribution of auroral hiss as a cone at a fixed angle with respect to the magnetic field that is isotropically distributed in the perpendicular plane. We apply this model to calculate the interferometric observables, coherency and phase, for a sounding rocket mission whose wave electric field receivers are on payloads that are separated 2–3 km along the magnetic field and 55–200 m across …
Characteristics Of Kentucky Agricultural Operations Participating In Nrcs Conservation Programs, Carmen T. Agouridis
Characteristics Of Kentucky Agricultural Operations Participating In Nrcs Conservation Programs, Carmen T. Agouridis
MPA/MPP/MPFM Capstone Projects
The Natural Resource Conservation Service (NRCS) designs and promotes a wide variety of conservation practices and programs that enhance the environment by reducing soil erosion, improving water quality, and enhancing and creating wildlife habitat. The impact of these practices and programs is largely dependent on the voluntary participation of landowners. Thus, central to the success of the NRCS conservation programs is an understanding of the characteristics of landowners and operations participating in these programs.
Using operator and operation characteristics from the 1997, 2002, and 2007 Censuses of Agriculture and controlling for county fixed effects, this study 1) identifies significant characteristics …
Strategic Management And Job Satisfaction: Agency-Level Effects In The Federal Government, Tara Bopp
Strategic Management And Job Satisfaction: Agency-Level Effects In The Federal Government, Tara Bopp
MPA/MPP/MPFM Capstone Projects
As strategic planning and human capital strategies become more regulated in the United States government, a decision must be made by federal agency heads. Will agencies fully participate and buy into the process of participative strategic planning and management or will they comply with regulations and reforms merely for the sake of compliance with little further effort? The intent of this study is to show that agencies that choose to do more than simply comply with GPRA and implement strategic planning and management can benefit from their increased effort in by increasing job satisfaction in their workforce.
The Government Performance …
Has The Emergence Of Charter Schools Affected Student Performance In Traditional Public Schools In Shared Markets? Recent Evidence From Public Schools In Ohio, Robert Akers
MPA/MPP/MPFM Capstone Projects
This paper addresses a key issue in the charter school debate, which is whether or not the existence of charter schools in a specific locality causes neighboring traditional public schools to improve their effectiveness. Measuring four student outcomes in Ohio counties where charter school enrollment represents at least five percent of the total public school-age population yielded mixed results. Standardized test scores in math and reading failed to keep pace with state averages but progress was made closing the gap in graduation rates and Performance Index Scores (the PIS is a weighted score given by the Ohio Department of Education …
Variability In X-Ray Line Ratios In Helium-Like Ions Of Massive Stars: The Radiation-Driven Case., K. Hole, Richard Ignace
Variability In X-Ray Line Ratios In Helium-Like Ions Of Massive Stars: The Radiation-Driven Case., K. Hole, Richard Ignace
ETSU Faculty Works
Line ratios in "fir" triplets of helium-like ions have proven to be a powerful diagnostic of conditions in X-ray emitting gas surrounding massive stars. Recent observations indicate that these ratios can be variable with time. The possible causes of variation in line ratios are limited: changes in the radiation field or changes in density, and changes in mass-loss or geometry. In this paper, we investigate the ability of changes in the radiation field to induce variability in the ratio R=f/i. To isolate the radiative effect, we use a heuristic model of temperature and radius changes in variable stars in the …
Growth Of Extensional Faults And Folds During Deposition Of An Evaporite-Dominated Half-Graben Basin; The Carboniferous Billefjorden Trough, Svalbard, Alvar Braathen, Karoline Bælum, Harmon Maher Jr., Simon J. Buckley
Growth Of Extensional Faults And Folds During Deposition Of An Evaporite-Dominated Half-Graben Basin; The Carboniferous Billefjorden Trough, Svalbard, Alvar Braathen, Karoline Bælum, Harmon Maher Jr., Simon J. Buckley
Geography and Geology Faculty Publications
Normal-sense movements along two major strands of the Billefjorden Fault Zone controlled sedimentation in the Carboniferous Billefjorden Trough. The Billefjorden Trough is a more than 2000 meters thick, west-dipping half-graben basin where accommodation was provided by combinations of extensional faulting and folding throughout the basin history. Whereas previous workers have interpreted several of these folds as due to Tertiary contraction, we argue that they developed during rifting, as extensional forced folds in the style described by other workers from rifts such as the Gulf of Suez. The present basin geometry indicates that accommodation was facilitated by a combination of fault …
Talking The Talk And Walking The Walk: Do A Federal Agency's Women-Centered Services Match A Women-Centered Organizational Culture?, Sally Anne Mcshane
Talking The Talk And Walking The Walk: Do A Federal Agency's Women-Centered Services Match A Women-Centered Organizational Culture?, Sally Anne Mcshane
All Graduate Theses, Dissertations, and Other Capstone Projects
Federal government agencies that provide services for women would presumably have an internal women-friendly organizational culture. In this study, organizational culture is measured by financial benefits - annual salary and federal General Schedule grade - provided to women. Regression analyses were used to examine whether gender, grade, and type of agency have an effect on salary and grade. Also bonuses to women are examined, as well as whether men or women are the heads of individual agencies or umbrella departments. Women were awarded fewer bonuses and lesser amounts as compared to men. Also women often are leaders of individual women-centered …
The Spillikin (Vol. 29), Valparaiso University
The Spillikin (Vol. 29), Valparaiso University
The Spillikin - The Christ College Newsletter
No abstract provided.
The Worst Form Of Championship, Except For All Of The Others That Have Been Tried: Analyzing The Potential Anti-Trust Vulnerability Of The Bowl Championship Series, David L. Ricci
Jeffrey S. Moorad Sports Law Journal (1994 - )
The article discusses the U.S. college football Bowl Championship Series (BCS) as of September 2012, focusing on the potential anti-trust implications of the National Collegiate Athletic Association's (NCAA) BCS system of individual bowl games, as well as several calls for the NCAA to implement a traditional playoff system for determining a national champion. The possibility of a successful Sherman Anti-Trust Act lawsuit against the NCAA is also addressed.
Bgsu Graduate College 2012-2013 Catalog, Bowling Green State University
Bgsu Graduate College 2012-2013 Catalog, Bowling Green State University
Course Catalogs
Bowling Green State University graduate catalog for 2012-2013
Employment Growth From Public Support Of Innovation In Small Firms, Albert N. Link, John T. Scott
Employment Growth From Public Support Of Innovation In Small Firms, Albert N. Link, John T. Scott
Upjohn Press
Link and Scott provide a statistical assessment of the employment growth associated with public support of R&D in small, entrepreneurial firms through the Small Business Innovation Research (SBIR) program.
Education Reform And The Limits Of Policy: Lessons From Michigan, Michael F. Addonizio, C. Philip Kearney
Education Reform And The Limits Of Policy: Lessons From Michigan, Michael F. Addonizio, C. Philip Kearney
Upjohn Press
By examining a major set of education policy reforms undertaken in Michigan and across the country over the past 20-plus years, Addonizio and Kearney are able to reveal the varying success of innovations such as finance reform, state assessment of student performance, school accountability measures, charter schools, and schools of choice.
Great Plains Soils May Be C Sinks, David E. Clay, Gregg C. Carlson, Sharon A. Clay, James Stone, Kurtis Reitsma, Ronald Gelderman
Great Plains Soils May Be C Sinks, David E. Clay, Gregg C. Carlson, Sharon A. Clay, James Stone, Kurtis Reitsma, Ronald Gelderman
Agronomy, Horticulture and Plant Science Faculty Publications
Numerous studies with wide-ranging results have been conducted to resolve if Great Plains soils are a C source or sink. The authors addressed the source/sink question by examining the results from producer soil samples and production surveys that were analyzed and archived by the South Dakota Soil Testing Laboratory. Results showed that between 1985 and 2010, soil organic C content increased at a rate of 326 lb C/A/year, for a total increase of 24%. The increase was attributed to planting better adapted varieties and using better management practices that on average increased corn grain yields 2.29 bu/A/year. Higher soil organic …