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Articles 58261 - 58290 of 58711
Full-Text Articles in Physical Sciences and Mathematics
Dünya Maden Haberleri̇, - -
Bulletin of the Mineral Research and Exploration
No abstract provided.
Dünya Kömür Mevcudu, - -
Dünya Kömür Mevcudu, - -
Bulletin of the Mineral Research and Exploration
No abstract provided.
İstati̇sti̇k, Fi̇yat Ve Grafi̇k, - -
İstati̇sti̇k, Fi̇yat Ve Grafi̇k, - -
Bulletin of the Mineral Research and Exploration
No abstract provided.
The Penetration Of Light Through Snow And Ice Cover, W. C. Croxton, W. B. Thurman, Theodore Shiffer
The Penetration Of Light Through Snow And Ice Cover, W. C. Croxton, W. B. Thurman, Theodore Shiffer
Journal of the Minnesota Academy of Science
During several months of each year, soil and bodies of water in high latitudes are separated from the enveloping atmosphere by a layer of snow and ice of varying thickness. The effects of this insulating layer are not well understood, having received relatively a rather surprisingly small amount of attention by ecologists. It is known that snow cover influences the heat exchange between the surface of the earth and the air. Ice is thought to interfere with gas exchange between water and air and with aeration by wave action to the extent that epidemic losses of fish life occur through …
The Extent To Which The Snow Blanket Influences The Temperature Beneath It, W. C. Croxton, Page Nicholson
The Extent To Which The Snow Blanket Influences The Temperature Beneath It, W. C. Croxton, Page Nicholson
Journal of the Minnesota Academy of Science
No abstract provided.
Geological Conditions Responsible For The Deficiency Of Underground Water In Certain Areas In Minnesota, Geo. A. Thiel
Geological Conditions Responsible For The Deficiency Of Underground Water In Certain Areas In Minnesota, Geo. A. Thiel
Journal of the Minnesota Academy of Science
No abstract provided.
Balkanlarda Petrol Araştirmalari, - -
Balkanlarda Petrol Araştirmalari, - -
Bulletin of the Mineral Research and Exploration
No abstract provided.
Dünya Maden Haberleri̇, - -
Bulletin of the Mineral Research and Exploration
No abstract provided.
İstati̇sti̇k, Fi̇yat Ve Grafi̇k, - -
İstati̇sti̇k, Fi̇yat Ve Grafi̇k, - -
Bulletin of the Mineral Research and Exploration
No abstract provided.
Gi̇sement De Fer De Di̇vri̇k Ressources En Mi̇nerai̇ De Fer De La Turqui̇e, V. Kovenko
Gi̇sement De Fer De Di̇vri̇k Ressources En Mi̇nerai̇ De Fer De La Turqui̇e, V. Kovenko
Bulletin of the Mineral Research and Exploration
No abstract provided.
The Effect Of Cultivation On Certain Chemical And Physical Properties Of Some South Dakota Soils, Oscar E. Olson
The Effect Of Cultivation On Certain Chemical And Physical Properties Of Some South Dakota Soils, Oscar E. Olson
Electronic Theses and Dissertations
Soil Nutrient losses have followed closely in the paths of advancing frontiers in agriculture. Remedies for depletion as the result of overcropping were sought by George Washington, whose interest and investigation of soil nutrient losses probably represent the earliest attention given to land exploitation in the United States, which at the present time has become a problem of national concern. Soil losses have been attributed to a number of causes , among which are cropping, erosion, leaching, burning, and rapid oxidation of organic matter in the soil. Associated with soil nutrient losses, certain significant physical and chemical changes may occur …
Wood Occurring In The Ginkgo And Associated Petrified Forest (No. 1-The Gingko), George F. Beck
Wood Occurring In The Ginkgo And Associated Petrified Forest (No. 1-The Gingko), George F. Beck
All Faculty Scholarship for the College of the Sciences
The most interesting single fossil tree, but at the same time the most difficult to determine in the Ginkgo Petrified Forest (Washington), is the tree after which this unusual petrified forest takes its name. The ginkgo is not only the world's oldest and most remarkable living tree, but it has long been regarded as holding the most striking fossil record of any living thing, plant or animal.
Grinding Thin Sections For Determining Petrified Woods, George F. Beck
Grinding Thin Sections For Determining Petrified Woods, George F. Beck
All Faculty Scholarship for the College of the Sciences
The collector and student of petrified woods cannot long be satisfied to merely place these colorful and interesting specimens in the cabinet with the mere label, "petrified wood." Frequently determining the types of wood which once thrived in a given area is of importance to give a clue to climatic conditions of past geological ages. The collector should at least be qualified to recognize the more common woods and distinguish one family of trees from another.
Conservation Of Land And Water Resources Of Nebraska, G. E. Condra
Conservation Of Land And Water Resources Of Nebraska, G. E. Condra
Conservation and Survey Division
No abstract provided.
Spruce In The Western Miocene, George F. Beck
Spruce In The Western Miocene, George F. Beck
All Faculty Scholarship for the College of the Sciences
One of the real surprises in store for us as we began to section specimens of petrified wood from the Vantage and certain other horizons in Central Washington, was the prevalence of a spruce type hardly hinted at in the leaf lists as published for the various sediments of Yakima time (upper miocene?).
A Preliminary Study Of The Animal Ecology Of The Niobrara Game Preserve, Watson E. Beed
A Preliminary Study Of The Animal Ecology Of The Niobrara Game Preserve, Watson E. Beed
Conservation and Survey Division
No abstract provided.
A Pleistocene Lake In The White River Valley, Paul Macclintock, Erwin Hinckley Barbour, C. B. Schultz, Alvin Leonard Lugn
A Pleistocene Lake In The White River Valley, Paul Macclintock, Erwin Hinckley Barbour, C. B. Schultz, Alvin Leonard Lugn
Department of Earth and Atmospheric Sciences: Faculty Publications
DURING the course of a field conference on the Pleistocene geology of western Nebraska, carved sediments were found in the headwater drainage of White River near Crawford, Nebraska. A reconnaissance of White River Valley revealed them to be present also in the mid-course, near Interior, South Dakota, and at the mouth, near Chamberlain, South Dakota, where the White River joins the Missouri (Fig. 1). These isolated occurrences of varves, over a distance of 240 miles, are so similar that a correlation seemed possible. Furthermore, since the varves occur within the area where Yuma artifacts are found, it was thought that …
A Study And Application Of The Process Of Supergene Enrichment Of Silver Ores., Arthur C. Verling
A Study And Application Of The Process Of Supergene Enrichment Of Silver Ores., Arthur C. Verling
Bachelors Theses and Reports, 1928 - 1970
In many deposits of silver ores the grade of the ore decreases considerably a few hundred feet below the surface. It is believed that in many cases the better ores owe their richness in part to the process of sulphide enrichment. It is recognized, however, that many rich silver ores are hypogene deposits that have been affected very little, if any, by processes of enrichment.
Chemical Analyses Of Some Oil-Well Waters Of Russell, Ellis And Trego Counties, H. Everett Runyon
Chemical Analyses Of Some Oil-Well Waters Of Russell, Ellis And Trego Counties, H. Everett Runyon
Master's Theses
Considerable work dealing with analysis of oil-well waters of other areas has been published, but to the knowledge of the author, none has been published dealing specifically with the waters of this area. While the waters dealt with in this paper are not far different from the waters of the Midcontinent area as a whole, there are certain differences which are noticeable. For instance strontium is found in the top waters of the Eldorado, Kansas field. None has been found in this area. The sulphate content of the top water here is very high. Both apparently cause trouble at times. …
The Extraction Of Manganese From Manganese Flue Dust., John Raymond Moore
The Extraction Of Manganese From Manganese Flue Dust., John Raymond Moore
Bachelors Theses and Reports, 1928 - 1970
It is estimated that 90 to 95% of the world’s consumption of manganese is used in the steel industry in the form of either ferromanganese or spiegeleisen. The remainder is used in the form of either salts or oxides, chloride, dioxide and monoxide.
The Control Of The Grain Size Of Zinc, Oswald J. Wick
The Control Of The Grain Size Of Zinc, Oswald J. Wick
Bachelors Theses and Reports, 1928 - 1970
The use of zinc as a structural metal has been militated against by two of its properties, namely, its low tensile strength and its susceptibility to grain growth. The importance of these factors can be appreciated when it is realized that the tensile strength of coarsely crystalline cast zinc is 4,000 pounds per square inch, while finely crystalline cast zinc has a tensile strength of 12,000 pounds per square inch.
A Study Of The Effect Of Oxygen On The Rate Of Dissolution Of Gold In Cyanide Solutions., John A. Cook
A Study Of The Effect Of Oxygen On The Rate Of Dissolution Of Gold In Cyanide Solutions., John A. Cook
Bachelors Theses and Reports, 1928 - 1970
The accepted chemical reactions in the dissolution of gold by cyanide solutions require the presence of gold, cyanide, water, and oxygen. The importance of dissolved oxygen in cyanide solutions as a factor is recognized by those familiar with cyanidation. Manufacturers of cyanidation equipment realize the necessity of oxygen, as shown by the appliances they have developed which are attached to the agitators in order to saturate the cyanide solutions with air.
Contact Metamorphism In The Highlands, Frank Trask Jr.
Contact Metamorphism In The Highlands, Frank Trask Jr.
Bachelors Theses and Reports, 1928 - 1970
On the southern margin of the Boulder Batholith, about twenty miles south of Butte in the Highland Mountains, there are many miles of contact between the igneous and sedimentary rocks. As two kinds of igneous rocks and many different kinds of sedimentary rock are present, it is an excellent place for the study of contact metamorphism.
The Effects Of Lime On The Amalgamation Of Gold., Rollien R. Wells
The Effects Of Lime On The Amalgamation Of Gold., Rollien R. Wells
Bachelors Theses and Reports, 1928 - 1970
An amalgam is an alloy of mercury with other metals, and amalgamation is the art of making or forming amalgams. In metallurgical language the word is limited to the means adopted for the recovery of gold and silver from their ores by the use of mercury.
Geology And Ore Deposits Of The Golden Era And Goldfinch Mines, Argenta Mining District, Montana., Glenn C. Johnston
Geology And Ore Deposits Of The Golden Era And Goldfinch Mines, Argenta Mining District, Montana., Glenn C. Johnston
Bachelors Theses and Reports, 1928 - 1970
This report includes the results of geological investigation of a small area in the northern part of the Argenta mining district. Approximately two square miles were mapped. The underground working of the three mines only were accessible: the Goldfinch. Golden Era, and Mayday mines.
A Preliminary Study Of Montana Copper - Nickel Ore, J. Argall Mcallister
A Preliminary Study Of Montana Copper - Nickel Ore, J. Argall Mcallister
Bachelors Theses and Reports, 1928 - 1970
Deposits of sulfides, containing nickel and copper with associated platineferous minerals occur in the Stillwater Igneous Complex. This is a group of unusual igneous rocks situated in Stillwater and Sweetgrass counties in Montana.
The Geology Of A Part Of The Bear River Range And Some Relationships That It Bears With The Rest Of The Range, Vic E. Peterson
The Geology Of A Part Of The Bear River Range And Some Relationships That It Bears With The Rest Of The Range, Vic E. Peterson
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The structure of the western three or four miles of the Bear River range east of Logan, Utah, has many times been alluded to in papers written locally on Cache Valley and the related ranges. There has not however, ever been, to the author's knowledge, an investigation made of this portion of the range for the express purpose of determining its exact structure. Although the area specifically covered by this present investigation is greatly inadequate to base the whole west range structure on, the author believes that the facts brought to light by the specific study of this area, added …
Geology Of Some Gold Deposits Of Montana, Leo Edwin Efraimson
Geology Of Some Gold Deposits Of Montana, Leo Edwin Efraimson
Bachelors Theses and Reports, 1928 - 1970
Gold is one of the rarer metals in nature, and chemically it is one of the most inactive. Gold forms stable, natural compounds with few other elements, and only with metals.
Soil Erosion Demonstration Areas In Southern Minnesota, R. H. Davis
Soil Erosion Demonstration Areas In Southern Minnesota, R. H. Davis
Journal of the Minnesota Academy of Science
No abstract provided.
An Analysis Of The Flowering Plants Of Nebraska, John Mack Winter
An Analysis Of The Flowering Plants Of Nebraska, John Mack Winter
Conservation and Survey Division
No abstract provided.