Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Earth Sciences (57961)
- Computer Sciences (56748)
- Environmental Sciences (50928)
- Engineering (39593)
- Life Sciences (39023)
-
- Physics (35481)
- Chemistry (33407)
- Geology (29561)
- Mathematics (26726)
- Social and Behavioral Sciences (22451)
- Oceanography and Atmospheric Sciences and Meteorology (15973)
- Statistics and Probability (12863)
- Computer Engineering (12703)
- Education (12581)
- Soil Science (12002)
- Plant Sciences (11262)
- Natural Resources and Conservation (10090)
- Medicine and Health Sciences (9767)
- Arts and Humanities (9605)
- Astrophysics and Astronomy (9043)
- Electrical and Computer Engineering (8786)
- Artificial Intelligence and Robotics (8467)
- Natural Resources Management and Policy (8401)
- Sustainability (8349)
- Water Resource Management (8221)
- Applied Mathematics (7789)
- Environmental Health and Protection (6818)
- Science and Mathematics Education (6724)
- Databases and Information Systems (6649)
- Institution
-
- University of Nebraska - Lincoln (24228)
- Western Michigan University (19505)
- University of Kentucky (11911)
- TÜBİTAK (10319)
- Selected Works (9842)
-
- Singapore Management University (7469)
- Utah State University (7159)
- Missouri University of Science and Technology (6034)
- Old Dominion University (5956)
- University of Wollongong (4867)
- William & Mary (4146)
- Wright State University (3839)
- University of South Florida (3816)
- Portland State University (3792)
- University of Nevada, Las Vegas (3625)
- Louisiana State University (3420)
- China Simulation Federation (3382)
- City University of New York (CUNY) (3125)
- Brigham Young University (2890)
- Purdue University (2809)
- Air Force Institute of Technology (2679)
- Claremont Colleges (2638)
- California Polytechnic State University, San Luis Obispo (2565)
- University of Arkansas, Fayetteville (2443)
- University of Texas Rio Grande Valley (2423)
- Department of Primary Industries and Regional Development, Western Australia (2351)
- Western Washington University (2343)
- University of Texas at El Paso (2316)
- Chinese Chemical Society | Xiamen University (2294)
- Chulalongkorn University (2268)
- Keyword
-
- Machine learning (1682)
- Climate change (1651)
- Western Australia (1583)
- Mathematics (1349)
- Sustainability (1114)
-
- Chemistry (1094)
- Physics (1050)
- Water quality (917)
- Deep learning (890)
- Groundwater (850)
- Geology (847)
- Machine Learning (823)
- Simulation (808)
- Research and Technical Reports (797)
- United States (755)
- Water (749)
- Nebraska (744)
- Education (735)
- Agriculture (711)
- Artificial intelligence (706)
- Climate (687)
- Grains and field crops (674)
- Statistics (673)
- Security (669)
- Management (665)
- Computer Science (657)
- Ecology (651)
- Optimization (650)
- Conservation (646)
- Remote sensing (638)
- Publication Year
-
- 2024 (8017)
- 2023 (12465)
- 2022 (17755)
- 2021 (27611)
- 2020 (15042)
-
- 2019 (14008)
- 2018 (13421)
- 2017 (12328)
- 2016 (12448)
- 2015 (11655)
- 2014 (11697)
- 2013 (10544)
- 2012 (11132)
- 2011 (9694)
- 2010 (8266)
- 2009 (7343)
- 2008 (7107)
- 2007 (6595)
- 2006 (5730)
- 2005 (5424)
- 2004 (4357)
- 2003 (3792)
- 2002 (3372)
- 2001 (2951)
- 2000 (2881)
- 1999 (2520)
- 1998 (2526)
- 1997 (2421)
- 1996 (2382)
- 1995 (2138)
- Publication
-
- Legacy Scout Tickets from Pure Oil Company (11044)
- Theses and Dissertations (8338)
- IGC Proceedings (1993-2023) (7096)
- Research Collection School Of Computing and Information Systems (6902)
- Thin Sections (5745)
-
- Electronic Theses and Dissertations (4195)
- Faculty Publications (3700)
- Journal of System Simulation (3382)
- Nebraska Tractor Tests (3347)
- Turkish Journal of Electrical Engineering and Computer Sciences (3020)
- Masters Theses (2634)
- Turkish Journal of Chemistry (2628)
- Turkish Journal of Mathematics (2494)
- Journal of Electrochemistry (2294)
- Honors Theses (2164)
- Faculty of Informatics - Papers (Archive) (2013)
- Physics Faculty Publications (1942)
- Bulletin of the Mineral Research and Exploration (1893)
- Doctoral Dissertations (1883)
- Dissertations, Theses, and Masters Projects (1876)
- Reports (1834)
- Dissertations (1816)
- Physics Faculty Research & Creative Works (1762)
- Department of Computer Science Technical Reports (1721)
- USF Tampa Graduate Theses and Dissertations (1606)
- School of Natural Resources: Faculty Publications (1586)
- United States Department of Agriculture Wildlife Services: Staff Publications (1528)
- Australian Institute for Innovative Materials - Papers (1524)
- Electronic Thesis and Dissertation Repository (1476)
- All Graduate Theses and Dissertations, Spring 1920 to Summer 2023 (1427)
Articles 289561 - 289590 of 292585
Full-Text Articles in Physical Sciences and Mathematics
The Effect Of Ddt Spraying In The Langley-Messick Area, 1947, Willard A. Van Engel
The Effect Of Ddt Spraying In The Langley-Messick Area, 1947, Willard A. Van Engel
Reports
Observations and notes on the effects of DDT spraying.
Test 380: John Deere B , Nebraska Tractor Test Lab
Test 380: John Deere B , Nebraska Tractor Test Lab
Nebraska Tractor Tests
EXPLANATION OF TEST REPORT: John Deere B
TEST A: The manufacturer's representative operates the tractor for a minimum of 12 hours using light to heavy drawbar loads in each gear.
This serves as a period for limber up, general observation and adjustments. Adjustments that are permissible include valve tappet clearance, breaker ,point gap, spark plug gaps, clutch and others of a similar nature. No new parts or accessories can be installed without having mention made of it in the report. No data' are recorded during this preliminary run except the time that the engine is operated.
BELT HORSEPOWER TESTS
TEST …
Test 382: Cockshutt Model 30, Nebraska Tractor Test Lab
Test 382: Cockshutt Model 30, Nebraska Tractor Test Lab
Nebraska Tractor Tests
All tractors tested at the Nebraska Tractor Test Laboratory were certified by their manufacturers as being stock model machines, conforming to specifications filed with the application for test. No special or high-test fuels were used except as recommended by the manufacturer as necessary.
All results within the official tractor test report were actually attained in tests and are without correction or allowances for friction, temperature, altitude, etc. The results were initially accomplished with the tractor in charge of skilled operators employed by the University.
Unless otherwise noted, each tractor was apparently in good condition at the end of the testing …
Test 385: Ford Model 8n, Nebraska Tractor Test Lab
Test 385: Ford Model 8n, Nebraska Tractor Test Lab
Nebraska Tractor Tests
All tractors tested at the Nebraska Tractor Test Laboratory were certified by their manufacturers as being stock model machines, conforming to specifications filed with the application for test. No special or high-test fuels were used except as recommended by the manufacturer as necessary.
All results within the official tractor test report were actually attained in tests and are without correction or allowances for friction, temperature, altitude, etc. The results were initially accomplished with the tractor in charge of skilled operators employed by the University.
Unless otherwise noted, each tractor was apparently in good condition at the end of the testing …
Test 389: Massey-Harris Model 44-Rt, Nebraska Tractor Test Lab
Test 389: Massey-Harris Model 44-Rt, Nebraska Tractor Test Lab
Nebraska Tractor Tests
All tractors tested at the Nebraska Tractor Test Laboratory were certified by their manufacturers as being stock model machines, conforming to specifications filed with the application for test. No special or high-test fuels were used except as recommended by the manufacturer as necessary.
All results within the official tractor test report were actually attained in tests and are without correction or allowances for friction, temperature, altitude, etc. The results were initially accomplished with the tractor in charge of skilled operators employed by the University.
Unless otherwise noted, each tractor was apparently in good condition at the end of the testing …
Water Levels And Artesian Pressure In Wells In Las Vegas Valley And In Other Valleys In Nevada, 1913-1945, T. W. Robinson, George B. Maxey, J. C. Fredericks, C. Harry Jameson
Water Levels And Artesian Pressure In Wells In Las Vegas Valley And In Other Valleys In Nevada, 1913-1945, T. W. Robinson, George B. Maxey, J. C. Fredericks, C. Harry Jameson
Publications (WR)
The rock formations of the earth are great natural reservoirs in which a part of the water derived from rain and snow is stored. Water levels and artesian pressure in wells register the stages of these natural reservoirs. The changes in water levels or artesian pressure are indicative of the depletion or replenishment of the natural reservoirs. Systematic and periodic measurements of water levels and artesian pressure in wells have been made in Nevada, by State and Federal agencies from time to time. However, only a few of these measurements have ever been published. Under the cooperative arrangement between the …
Test 386: Mccormick-Deering Farmall Cub, Nebraska Tractor Test Lab
Test 386: Mccormick-Deering Farmall Cub, Nebraska Tractor Test Lab
Nebraska Tractor Tests
All tractors tested at the Nebraska Tractor Test Laboratory were certified by their manufacturers as being stock model machines, conforming to specifications filed with the application for test. No special or high-test fuels were used except as recommended by the manufacturer as necessary.
All results within the official tractor test report were actually attained in tests and are without correction or allowances for friction, temperature, altitude, etc. The results were initially accomplished with the tractor in charge of skilled operators employed by the University.
Unless otherwise noted, each tractor was apparently in good condition at the end of the testing …
Test 390: Ellinwood Tiger Cat, Nebraska Tractor Test Lab
Test 390: Ellinwood Tiger Cat, Nebraska Tractor Test Lab
Nebraska Tractor Tests
All tractors tested at the Nebraska Tractor Test Laboratory were certified by their manufacturers as being stock model machines, conforming to specifications filed with the application for test. No special or high-test fuels were used except as recommended by the manufacturer as necessary.
All results within the official tractor test report were actually attained in tests and are without correction or allowances for friction, temperature, altitude, etc. The results were initially accomplished with the tractor in charge of skilled operators employed by the University.
Unless otherwise noted, each tractor was apparently in good condition at the end of the testing …
Duck, Goose And Pheasant Records From Ogallala Game Dressing Station, 1943-1946, John H. Wampole
Duck, Goose And Pheasant Records From Ogallala Game Dressing Station, 1943-1946, John H. Wampole
Nebraska Game and Parks Commission: White Papers, Conference Presentations, and Manuscripts
For several seasons records of the number of ducks brought in to be dressed have been kept at an Ogallala dressing station. Records have been tabulated and summarized in an effort to measure the hunter success. Since no record of hunter-days or hunter-trips is obtainable, this report is based upon seasonal totals, daily averages, and numbers per bag. Table III (page 27) shows the number of bags, seasonal totals and average numbers of birds per bag. Table IV shows the take by months and Table V shows the averages per day for the three months of each season.
A Spectral Study Of Some Deuterated Toluenes., Charles Hooper Smith
A Spectral Study Of Some Deuterated Toluenes., Charles Hooper Smith
LSU Historical Dissertations and Theses
No abstract provided.
Crude Oil Salts In Petroleum Refining., Thomas Porter Bailey 1914-2001
Crude Oil Salts In Petroleum Refining., Thomas Porter Bailey 1914-2001
Electronic Theses and Dissertations
No abstract provided.
A Study Of The Synthesis Of 4-Chlorobutanal., Carl E. Moore 1915-2012
A Study Of The Synthesis Of 4-Chlorobutanal., Carl E. Moore 1915-2012
Electronic Theses and Dissertations
No abstract provided.
Wildlife Records From Mail Carriers In April, Levi L. Mohler
Wildlife Records From Mail Carriers In April, Levi L. Mohler
Nebraska Game and Parks Commission: White Papers, Conference Presentations, and Manuscripts
608 mail carriers kept records of game birds seen during the week of April 21 - 26. This was the eighth time that mail carriers have cooperated on a statewide basis. April counts were omitted in 1946 but comparisons are made below of 1945 and 1947 data.
The mail carriers' work provides an inexpensive method of getting extensive statewide observations, and informational bulletins returned to the carriers are of definite value as a public relations step. (Many ot the carriers send in long letters, in addition to the card form, and in a number of instances they have reported information …
Thayer County Preliminary Ground Water Study 1947 (Gm-33): Reed, E.C. Conservation And Survey Division , Size 8.5" X 11"., E.C. Reed
Conservation and Survey Division
No abstract provided.
Nuckolls County Preliminary Ground Water Study 1947 And 1948, E.C. Reed
Nuckolls County Preliminary Ground Water Study 1947 And 1948, E.C. Reed
Conservation and Survey Division
No abstract provided.
An Investigation Of The Colorimetric Methods For The Determination Of Fluorine By The Zirconium Alizarin Sulfonate Method, William Lewis Break
An Investigation Of The Colorimetric Methods For The Determination Of Fluorine By The Zirconium Alizarin Sulfonate Method, William Lewis Break
Masters Theses
"There has been a need for a rapid and an accurate method for the determination of fluorine in its compounds. Both gravimetric and volumetric methods have been studied, but both methods were time consuming or inaccurate or both. Colorimetric methods had been studied before F. Richter developed his method but none had been reported to be as satisfactory as his method. This method was investigated because it was thought that F. Richter's method would be a satisfactory colorimetric determination for fluorine in its compounds"--Introduction, page 1.
Insoluble Residues Of Five Sections Of The Amsden Formation, Wilmer R. Peterson
Insoluble Residues Of Five Sections Of The Amsden Formation, Wilmer R. Peterson
Bachelors Theses and Reports, 1928 - 1970
The term, "insoluble residue," as used in this report is that portion of the original rock sample remaining after the sample has been digested by a mixture of one part hydrocloric acid and two parts water. The remains or insoluble residue from this acid treatment may vary from nothing to I00 percent.
Geology Of The Ozark-Martin Mine Area, Madison County, Missouri, William Clifton Hayes
Geology Of The Ozark-Martin Mine Area, Madison County, Missouri, William Clifton Hayes
Masters Theses
"General descriptions of the region adjacent to the Ozark and Martin Mines of Madison County, Missouri have been included in a number of early publications dealing with the Einstein Silver Mine area, but a detailed geologic map has not been made. It was thought that through detailed mapping and by a detailed analysis of all of the geologic features present, a more definite relationship between mineralization and structure might be determined"--Introduction, Purpose and Scope of Work, page 1.
The Separation Of The Rare Earths Neodymium And Praseodymium By Precipitation As Chloride, Stanley Milton Kulifay
The Separation Of The Rare Earths Neodymium And Praseodymium By Precipitation As Chloride, Stanley Milton Kulifay
Masters Theses
"The purpose of this thesis is to provide a means of preparing highly purified samples of neodymium and praseodymium compounds when the material to be refined already exists in a state of approximate purity. The method described cannot be profitably used to purify the individual rare earths without first concentrating them. The process is not intended to be quantitative, for it is a fractional crystallization technique using a concentrated hydrochloric acid medium"--Introduction, page 1.
Geology Of The Einstein-Apex Tungsten Mine Area, Joel B. Pomerene
Geology Of The Einstein-Apex Tungsten Mine Area, Joel B. Pomerene
Masters Theses
"The geological problem existing in the Silver Mine area, the relationship of mineralization to structure, particularly to faulting and jointing, was pointed out to the writer by Prof. O. R. Grawe. Several geologists have made reconnaisance [sic] surveys of the whole region, but so far no detailed geologic map has been published of the immediate area. Prof. Grawe pointed out that such a map would be of value in the better understanding of the area and would be especially useful in the event that another national emergency required the development of all possible sources of tungsten"--Introduction, Selection of the Problem, …
The Geologic History Of The Bison In The Great Plains (A Preliminary Report), C. Bertrand Schultz, W. D. Frankforter
The Geologic History Of The Bison In The Great Plains (A Preliminary Report), C. Bertrand Schultz, W. D. Frankforter
Bulletin of the University of Nebraska State Museum
THE GEOLOGIC history of the bison in North America is a subject which has received little attention to date. Osteological rather than geological problems have been the main concern of most writers who have so far published. If the geologic history of the bison is to be learned, it will be necessary to devote more time and effort in the field in determining the age of the deposits in which various specimens have been discovered and in making more extensive collections from deposits of known age. Unfortunately the majority of the type specimens have been surface finds and little attempt …
Odor Report (1946), Walter Lawrance
Press Report (1946), Walter A. Lawrance
An Investigation Of The Meaning Of Α3 As A Measure Of Skewness, John W. Coy
An Investigation Of The Meaning Of Α3 As A Measure Of Skewness, John W. Coy
Mathematics & Statistics ETDs
The purpose of this study is the interpretation of α3 by means of a relatively simple formula which will predict the amount of shift in the effective limits of the Type III curve for a given change in the skewness. The methods used are chiefly empirical.
Studies In The Determination Of Iodine In Soils Organic Materials, And Waters, Russell T. Lundell
Studies In The Determination Of Iodine In Soils Organic Materials, And Waters, Russell T. Lundell
Theses and Dissertations
A summary of the literature on the nutritional value of iodine in the diet of various forms of life is given. The majority of evidence indicates that iodine is an essential element in plant and animal nutrition. It functions particularly in animal metabolism in the form of thyroxine. The occurrence of iodine in a nature has been briefly discussed. Investigations made in this regard indicate iodine to be almost universally distributed in very minute amounts. Most iodine salts are soluble in water and their distribution is affected by water movements. Results of iodine determinations made during the course of this …
A Study Of Retention Of Percentage, Fred Dellett
A Study Of Retention Of Percentage, Fred Dellett
Master's Theses
The problem of this thesis was to determine by means of a test the retention of the fundamentals of percentage as shown by beginning eighth grade pupils, who were taught percentage the previous year in the seventh grade. The fundamentals of percentage are here considered as the changing of percents to decimal fractions or common fractions, the reverse procedures, and the three types of problems arising from the relation, base times rate equals part. These quantities, base, rate, and part, are represented in the example, 300 X 12% = 36, respectively. Because of the inherent relationship of decimal fractions and …
Preliminary Investigations On The Effects Of Commerical Fishing On Game Fish In Lake Okeechobee And The St. John's River., Nelson Marshall
Preliminary Investigations On The Effects Of Commerical Fishing On Game Fish In Lake Okeechobee And The St. John's River., Nelson Marshall
RSMAS Technical Reports
No abstract provided.
Geology And Ore Deposits Of The Dunmore Mine, Ouray County, Colorado, Caswell Silver
Geology And Ore Deposits Of The Dunmore Mine, Ouray County, Colorado, Caswell Silver
Earth and Planetary Sciences ETDs
The Dunmore lode is located near Ouray, Colorado in the northwest part of the San Juan Mountains. In structure as well as mineral assemblage it shows a connection between the chimneys and veins of the region. The lode averages about 100 feet wide for 1,200 feet along the Dunmore claim. The fissure zone is over two miles long and displacement along it has offset a folded pre-Cambrian complex 4,500 feet prior to the deposition of 2,400 feet of volcanic tuff. Fissures in the pre-Cambrian rocks controlled in part the intrusion of dikes and the formation of veins. Late Tertiary faulting …
The Effect Of Sodium And Potassium Ions On The Time Of Set Of Silicic Acid Gels, Orin Chester Hansen
The Effect Of Sodium And Potassium Ions On The Time Of Set Of Silicic Acid Gels, Orin Chester Hansen
Honors Theses
This paper will deal with the relative effect of the potassium and sodium ions on the time of set. To determine this effect, gels were prepared using potassium silicate in place of the sodium silicate used in the previous experiments on the effects of electrolytes in this laboratory. The heat of activation for the setting of the potassium silicate gels was determined by the method used by Hurd and Letterton (7) in which the logarithm of the time of set was plotted against the reciprocal absolute temperature, the heat of activation being computed from the slope of the resulting line …
The Effect Of Polyvalent Electrolytes On The Viscosity Of Silicic Acid Gel Mixtures, David John Gimber
The Effect Of Polyvalent Electrolytes On The Viscosity Of Silicic Acid Gel Mixtures, David John Gimber
Honors Theses
Von Weimarn has shown that the degree of supersaturation at the time of formation, and the viscosity of the medium account, qualitatively at least, for the resulting character of the precipitate from a solution, whether it be crystalline of amorphous. When fairly concentrated solutions form precipitates they are usually colloidal in nature and may even be gelatinous, or a jelly may be formed. When a precipitate, thus formed, retains an appreciable quantity of the liquid in which it was dissolved in the form of a semi-rigid mass, it is termed a “gelatinous precipitate”, and if all the liquid is initially …