Digital Commons Network^™

The Effect Of Base Course Gradation On The Results Of Laboratory Pumping Tests, W. P. Chamberlin

JTRP Technical Reports

No abstract provided.

Servomechanism Compensation With An Active Phase-Lead Network, Robert T. Dewoody

Masters Theses

"The problem is to develop a phase-lead compensation network for a servomechanism which will not reduce the low-frequency gain and thus decrease the velocity-lag error. The principal part of this thesis deals with the design of such an active phase-lead network. The active network does not have d-c coupling; this eliminates drift problems.

To illustrate an active phase-lead network a simple second order servomechanism is used as a basis for comparing three methods of compensation.

The first method is compensation with a conventional phase-lead network with a gain decrease. The second method is compensation with a conventional phase-lead network with …

Temperature Stabilized Transistor Direct Current Amplifier, William Lewis Metcalf Jr.

Masters Theses

"A stable direct current transistor amplifier is difficult to design for use at elevated temperatures. The above is true since transistor parameters and bias conditions are affected by temperature. When transistors are incorporated in direct coupled amplifier circuits, these variations in parameters and bias conditions usually result in unstable operation. It is the purpose of this thesis to investigate this problem and to design a stable direct current transistor amplifier which will operate satisfactorily at elevated temperatures.

This problem is of importance as such direct current amplifier circuits are found in airborne or missile servo systems. In such systems the …

Determination Of Lattice Constants, And Thermal Expansion Coefficients Of Ti₂O₃ And Of Its Solid Solutions With Ti, Tatsuhiko Ejima

Masters Theses

"For the determination of the precise lattice constants of Ti₂O₃, it is very important to use a Ti₂O₃ as pure as possible.

Due to the formation of solid solution with titanium or oxygen, ranging from 32.5 to. 34.5% O₂ by weight in the Ti-O binary system, it is very difficult to get a pure Ti₂O₃ (33.8% O₂ by weight) in the laboratory.

To determine the precise lattice constants of pure Ti₂O₃, therefore, the extrapolation method was used.

This method computes the respective constants for pure Ti₂O₃ from the values obtained With Ti₂O₃-Ti solid solutions by extrapolation. To carry out such …

Filter Materials For Emergency Use In Diatomite Type Water Filters, Robert Wassell Mcleane

Masters Theses

"A completely different type of filter, using diatomaceous earth as the filter media, had been in use for many years for filtration of industrial liquids, however, the use of diatomaceous earth for water filtration purposes had been discouraged due to the rapid clogging of the filter material. "As late as 1930 it was reported that the very excellence of filtration with diatomite prevented its extensive use in water filtration except where complete elimination of bacteria and suspended matter is essential.”

Diatomaceous earth, however, seemed to exhibit the general properties the research groups were seeking; in the refined state it exhibited …

The Stability Of Rectangular Plates With Built-In Supports At The Edges, John Bruce Miles

Masters Theses

"The purpose of this investigation is to derive an expression for the critical stress for a thin rectangular plate with compressive edge loading. The load is applied on two opposite edges with the remaining two edges built-in. (See Fig. 1) This is essentially a stability problem.

Rectangular plates with compressive edge loading and various edge restraints appear in a number of engineering structures. Bulkheads of ships could be so classified, as could certain components of fabricated beams and columns. The new supersonic B-58 bomber developed by Convair has a honeycomb wing structure dictated by heat conduction requirements. This, too, involves …

Investigation Of Length Changes In Prestressed Concrete Slabs With Outside Exposures, John Best

Masters Theses

"In general, pavements may be classed as being either rigid or flexible. The term “rigid pavement”, as commonly used in the United States, is applied only to wearing surfaces constructed of portland-cement concrete. All other types of pavements are classed as “flexible”. A pavement constructed of portland-cement concrete is assumed to possess considerable flexural strength which will permit it to act as a beam and allow it to bridge any minor irregularities which may occur in the base on which it rests, hence the term “rigid”….

In view of the experience and information gathered in over 50 years of road …

Physical Properties Of Concrete At Early Ages, Curtis E. Weddle Jr.

Masters Theses

"The introduction of the motor vehicle and the subsequent rapid expansion of the highway systems of the United States have brought with them many problems.

The Civil Engineer, in his attempts to provide adequate safe avenues of travel for the populace, has been faced with many problems. Handicapped by the need for speed in design and lack of information of the trends in motor vehicle design, the engineer has been forced at times to utilize design methods inconsistent with good engineering practices.

Of the many types of pavement sections which have been designed in an effort to provide structurally and …

Investigation Of Length Changes And Warping In Thin Prestressed Pavements, Wilbur D. Stites

Masters Theses

"The present growth of the American highway system presents a staggering problem to the highway designer. The increased and urgent demand for more highways, capable of accommodating traffic loads that are constantly increasing, combined with the increased construction cost of highways, behooves the present day highway designer to envision future highway problems that will arise. These future problems are numerous and complex; however, it seems the primary problem is the selection of a surfacing material that will withstand projected traffic loads with a maximum economy of construction and future maintenance costs. Concrete at the present time is the most satisfactory …

Creep Characteristics Of Thin Prestressed Concrete Slabs, Wayne F. Alch

Masters Theses

"Prestressed concrete as a structural material is finding wider usage in the United States today. Until recently, economic factors have precluded the use of prestressed concrete in this country, while Europe became the leader in discovering new uses and applications in construction for the material. As new methods are developed in this country, more engineers and contractors are discovering that prestressed concrete is, in many ways, far superior to plain or reinforced concrete. In line with this awakening the Missouri Highway Department is carrying on research to determine the feasibility of prestressed concrete for highway slabs. This study is a …

The Magnitude And Directions Of Strains And Stresses In Edge Loaded Concrete Slabs, William M. Baldwin

Masters Theses

"The concrete industry in the United States represents one of the fastest growing segments of the national economy. Many reasons for this may be given, among which are, the durability of concrete structures, the local availability of a large portion of the materials used in concrete, and its wide range of adaptability to the designs of engineers and architects.

One of the most recent changes in concrete usage is the change from reinforced concrete to prestressed concrete. The term prestressed as used herein refers to any type of reinforced concrete in which the reinforcing material has a stress prior to …

Physical Properties Of Concrete At Early Ages, Karl H. Dunn

Masters Theses

"There are well over 100,000 miles of concrete pavements existing today on our United States highway system. The development of these pavements during the first half of this century has been a process of learning from construction applications and mistakes. However, the unexpected increase in traffic load has brought highway designers to experiment with relatively new types and designs of concrete pavement construction.

Some designers, in an effort to reduce temperature warping stresses, have used short slabs 10 to 15 feet in length, generally unreinforced. Another type of construction is the definitely jointed slabs, the slabs being from 20 to …

A Determination Of The Sonic Modulus Of Early Age Concrete, William Dale Nelson

Masters Theses

"The problem which the writer is analyzing in this thesis was suggested by Professor E. W. Carlton of the Civil Engineering Department. It is a determination, by use of sonic testing equipment, of the growth in the sonic modulus of early age concrete.

Since 1938 when T. C. Powers published his paper, "Measuring Young's Modulus of Elasticity by Means of Sonic Vibrations", in the proceedings of the American Society of Testing Materials, Vol. 38, Part II, a great deal of work has been done on the applications of sonic testing of concrete. It began a new era in concrete testing, …

Investigation Of Plastic Deformation In Prestressed Concrete Slabs From Long Time Loading, Joe B. Roberts

Masters Theses

"It is the purpose of this research to investigate the creep in a thin concrete slab under a long-time prestress load with the compressive load being applied to the edge of the slab through a bearing plate of small dimensions.

Seven plain concrete slabs, 3' x 4' x 4", approximately one year old, made of normal cement and approved aggregate were subjected to the following loading conditions: (1) Three slabs loaded at the center of the greater dimension with a prestress load or 20,000 pounds applied over an area of eight square inches, (2) Three slabs loaded symmetrically at six …

Hydraulic Model Studies Of Culvert Operation, Eugene M. West

Kentucky Transportation Center Research Report

Since 1951 the Division of Research has been engaged in a comprehensive study of highway drainage problems. This study has included special investigations of rainfall and runoff, drainage structures in use and the practices used in their design, culvert hydraulics, and other relevant investigations. To date, reports have been published concerning runoff and rainfall variables (1 and 2)* and the effects of barrel roughness upon culvert operation (3), together with the preparation of a drainage manual for the use of Highway Department engineers and consultants.

The most recent special project, part of the over-all study, has dealt with the effects …

Analysis Of Pavement Riding Quality: A Triaxial Evaluation Of Pavement Roughness, William S. Foy

Kentucky Transportation Center Research Report

For the last twenty-five years considerable research has been directed toward developing reliable equipment for evaluating pavement roughness. Since roughness inhibits passenger riding comfort and safety, as well as inducing vehicle deterioration, the determination of the features that cause roughness would indicate possible improvements in pavement design, materials, construction practices and equipment. For example, certain types of base design might be found to produce smoother surfaces than others; and a construction practice such as a blade-spread leveling course might result in more uniform pavements. Then too, evaluation of pavement roughness would permit relative comparison of pavements as one of several …

Test 603: Massey-Harris 333 (Gasoline), Nebraska Tractor Test Lab

Nebraska Tractor Tests

This report and any related files are made available to the online through the Lester F. Larsen Tractor Test and Power Museum as resources allow. Established in 1998, this museum is located on the University of Nebraska-Lincoln East Campus. It is and appropriately housed within the walls of the historic 1920 Nebraska Tractor Test Laboratory, where the first tractor test was started on March 31st, 1920. Because the pioneer tests became worldwide standards, this location was designated as a Historic Landmark of Agricultural Engineering by the American Society of Agricultural Engineers in 1980, shortly after testing was moved to a …

Test 602: Massey-Harris 444 Lp, Nebraska Tractor Test Lab

Nebraska Tractor Tests

This report and any related files are made available to the online through the Lester F. Larsen Tractor Test and Power Museum as resources allow. Established in 1998, this museum is located on the University of Nebraska-Lincoln East Campus. It is and appropriately housed within the walls of the historic 1920 Nebraska Tractor Test Laboratory, where the first tractor test was started on March 31st, 1920. Because the pioneer tests became worldwide standards, this location was designated as a Historic Landmark of Agricultural Engineering by the American Society of Agricultural Engineers in 1980, shortly after testing was moved to a …

Test 596: Ferguson Model 40, Nebraska Tractor Test Lab

Nebraska Tractor Tests

This report and any related files are made available to the online through the Lester F. Larsen Tractor Test and Power Museum as resources allow. Established in 1998, this museum is located on the University of Nebraska-Lincoln East Campus. It is and appropriately housed within the walls of the historic 1920 Nebraska Tractor Test Laboratory, where the first tractor test was started on March 31st, 1920. Because the pioneer tests became worldwide standards, this location was designated as a Historic Landmark of Agricultural Engineering by the American Society of Agricultural Engineers in 1980, shortly after testing was moved to a …

Test 595: Massey-Harris Model 50, Nebraska Tractor Test Lab

Nebraska Tractor Tests

This report and any related files are made available to the online through the Lester F. Larsen Tractor Test and Power Museum as resources allow. Established in 1998, this museum is located on the University of Nebraska-Lincoln East Campus. It is and appropriately housed within the walls of the historic 1920 Nebraska Tractor Test Laboratory, where the first tractor test was started on March 31st, 1920. Because the pioneer tests became worldwide standards, this location was designated as a Historic Landmark of Agricultural Engineering by the American Society of Agricultural Engineers in 1980, shortly after testing was moved to a …

Test 589: International T-6, Nebraska Tractor Test Lab

Nebraska Tractor Tests

This report and any related files are made available to the online through the Lester F. Larsen Tractor Test and Power Museum as resources allow. Established in 1998, this museum is located on the University of Nebraska-Lincoln East Campus. It is and appropriately housed within the walls of the historic 1920 Nebraska Tractor Test Laboratory, where the first tractor test was started on March 31st, 1920. Because the pioneer tests became worldwide standards, this location was designated as a Historic Landmark of Agricultural Engineering by the American Society of Agricultural Engineers in 1980, shortly after testing was moved to a …

Test 587: International Td-6, Nebraska Tractor Test Lab

Nebraska Tractor Tests

This report and any related files are made available to the online through the Lester F. Larsen Tractor Test and Power Museum as resources allow. Established in 1998, this museum is located on the University of Nebraska-Lincoln East Campus. It is and appropriately housed within the walls of the historic 1920 Nebraska Tractor Test Laboratory, where the first tractor test was started on March 31st, 1920. Because the pioneer tests became worldwide standards, this location was designated as a Historic Landmark of Agricultural Engineering by the American Society of Agricultural Engineers in 1980, shortly after testing was moved to a …

Test 586: International Td-9, Nebraska Tractor Test Lab

Nebraska Tractor Tests

This report and any related files are made available to the online through the Lester F. Larsen Tractor Test and Power Museum as resources allow. Established in 1998, this museum is located on the University of Nebraska-Lincoln East Campus. It is and appropriately housed within the walls of the historic 1920 Nebraska Tractor Test Laboratory, where the first tractor test was started on March 31st, 1920. Because the pioneer tests became worldwide standards, this location was designated as a Historic Landmark of Agricultural Engineering by the American Society of Agricultural Engineers in 1980, shortly after testing was moved to a …

Test 585: International Td-14, Nebraska Tractor Test Lab

Nebraska Tractor Tests

This report and any related files are made available to the online through the Lester F. Larsen Tractor Test and Power Museum as resources allow. Established in 1998, this museum is located on the University of Nebraska-Lincoln East Campus. It is and appropriately housed within the walls of the historic 1920 Nebraska Tractor Test Laboratory, where the first tractor test was started on March 31st, 1920. Because the pioneer tests became worldwide standards, this location was designated as a Historic Landmark of Agricultural Engineering by the American Society of Agricultural Engineers in 1980, shortly after testing was moved to a …

Test 588: International Td-18, Nebraska Tractor Test Lab

Nebraska Tractor Tests

This report and any related files are made available to the online through the Lester F. Larsen Tractor Test and Power Museum as resources allow. Established in 1998, this museum is located on the University of Nebraska-Lincoln East Campus. It is and appropriately housed within the walls of the historic 1920 Nebraska Tractor Test Laboratory, where the first tractor test was started on March 31st, 1920. Because the pioneer tests became worldwide standards, this location was designated as a Historic Landmark of Agricultural Engineering by the American Society of Agricultural Engineers in 1980, shortly after testing was moved to a …

Field Manual, Fm 11-30, Signal Corps Technical Intelligence, August 1956, Robert Bolin , Depositor

United States Department of Defense Military Intelligence

This is a very thorough manual which can be viewed as a detailed definition of Signal Corps technical intelligence and of the role of the Signal Corps Intelligence Agency (SCIA). When this was published the field of Signal Corps technical intelligence was about 15 years old and the SCIA was about six years old.

The modern US Army vision of the technical intelligence developed during World War II. Shortly before World War II, Army Technical Services had been instructed to set up intelligence sections in the office of their chiefs. The technical services were bureaus which supplied weapons, equipment, and …

Test 584: Caterpiller D-9, Nebraska Tractor Test Lab

Nebraska Tractor Tests

This report and any related files are made available to the online through the Lester F. Larsen Tractor Test and Power Museum as resources allow. Established in 1998, this museum is located on the University of Nebraska-Lincoln East Campus. It is and appropriately housed within the walls of the historic 1920 Nebraska Tractor Test Laboratory, where the first tractor test was started on March 31st, 1920. Because the pioneer tests became worldwide standards, this location was designated as a Historic Landmark of Agricultural Engineering by the American Society of Agricultural Engineers in 1980, shortly after testing was moved to a …

Test 583: Caterpiller D-8, Nebraska Tractor Test Lab

Nebraska Tractor Tests

This report and any related files are made available to the online through the Lester F. Larsen Tractor Test and Power Museum as resources allow. Established in 1998, this museum is located on the University of Nebraska-Lincoln East Campus. It is and appropriately housed within the walls of the historic 1920 Nebraska Tractor Test Laboratory, where the first tractor test was started on March 31st, 1920. Because the pioneer tests became worldwide standards, this location was designated as a Historic Landmark of Agricultural Engineering by the American Society of Agricultural Engineers in 1980, shortly after testing was moved to a …

Test 582: Caterpiller D-7, Nebraska Tractor Test Lab

Nebraska Tractor Tests

This report and any related files are made available to the online through the Lester F. Larsen Tractor Test and Power Museum as resources allow. Established in 1998, this museum is located on the University of Nebraska-Lincoln East Campus. It is and appropriately housed within the walls of the historic 1920 Nebraska Tractor Test Laboratory, where the first tractor test was started on March 31st, 1920. Because the pioneer tests became worldwide standards, this location was designated as a Historic Landmark of Agricultural Engineering by the American Society of Agricultural Engineers in 1980, shortly after testing was moved to a …

Test 581: Allis-Chalmers Hd-11b, Nebraska Tractor Test Lab

Nebraska Tractor Tests

This report and any related files are made available to the online through the Lester F. Larsen Tractor Test and Power Museum as resources allow. Established in 1998, this museum is located on the University of Nebraska-Lincoln East Campus. It is and appropriately housed within the walls of the historic 1920 Nebraska Tractor Test Laboratory, where the first tractor test was started on March 31st, 1920. Because the pioneer tests became worldwide standards, this location was designated as a Historic Landmark of Agricultural Engineering by the American Society of Agricultural Engineers in 1980, shortly after testing was moved to a …