Extension of modern control system theory Final report

Analysis and synthesis techniques for linear systems and methods of minimizing sensitivity of optimal control systems to large parameter variation

Universal dielectric loss in amorphous solids from simultaneous bias and microwave field

We derive the ac dielectric loss in glasses due to resonant processes created by two-level systems and a swept electric field bias. It is shown that at sufficiently large ac fields and bias sweep rates the nonequilibrium loss tangent created by the two fields approaches a universal maximum determined by the bare linear dielectric permittivity. In addition this nonequilibrium loss tangent is derived for a range of bias sweep rates and ac amplitudes and show that the loss tangent creates a predicted loss function that can be understood in a Landau-Zener theory and which can be used to extract the TLS density, dipole moment, and relaxation rate.Comment: To appear in Physical Review Letters, 4 pages, 3 figure

Lightweight Concrete Aggregate from South Dakota Shales

The development of South Dakota shales for a lightweight concrete aggregate by the Agricultural Engineering Department of the Agricultural Experiment Station was prompted by several factors. First of all, an abundant supply of various shales is in existence west of the Missouri River in the state. The shortage of the finished product is nationwide, and the need for a good aggregate in farm building is pressing. Also, the existing plants in production are somewhat scattered, which increases the transportation charges and the cost to consumer. At the present time, there is no high quality lightweight aggregate produced in the state. There are a few plants in operation producing a small amount of perlite, froth-like particles of acidic volcanic glass, white to gray in color. A considerable volume of cinders from power plants and furnaces is being used. The tremendous growth of the building block industry in the last 15 years has been one of the outstanding construction developments in America, as product sales multiplied 80 times in the 10 years prior to 1946. During World War II, increased construction brought about a scarcity and restricted use of highly competitive building materials. However, the tremendous growth of the building block industry has not been due to scarcity of other materials alone, since concrete blocks have been utilized more and more in building construction since the depression days of the early thirties. An acute shortage of good lightweight aggregates has existed for approximately eight years. This may be partially attributed to the change-over to various furnace fuels from coal and the increased use of powdered coal, eliminating to a marked degree, clinkers and cinders that have been used in large quantities in the past for concrete aggregates. There also has been an increasing market for precast building units. Using lightweight aggregate concrete in large commercial buildings has augmented the enormous demand for suitable aggregates and also contributed to the market shortage. Private industry and various governmental agencies have undertaken considerable investigation in developing lightweight aggregates from shales, clays, slates, and slag. The Bureau of Mines has published information on the different aspects= of the industry from time to time. Also, a cooperative project has been carried out by the Bureau of Mines, Norris, Tennessee, in conjunction with the Tennessee Valley Authority. Geologists and engineers of the Tennessee Valley Authority have investigated raw materials, procured samples, and estimated manufacturing costs of shales in Tennessee.2 Since the wide range of geological formations over the state makes it impossible to give reliable recommendations as to the possibilities of the raw shale for a concrete aggregate without a careful and detailed laboratory study of the specific shale in question, this research was undertaken. The purpose of this research was to determine the feasibility of obtaining a finished product from raw shales suitable for concrete and concrete block construction which would have as many desirable characteristics as possible. The results are given in this preliminary report

A biographical study of Horace Bushnell with particular reference to his influence on modern religious education

https://place.asburyseminary.edu/ecommonsatsdissertations/2401/thumbnail.jp

Human Factors Considerations in System Design

Human factors considerations in systems design was examined. Human factors in automated command and control, in the efficiency of the human computer interface and system effectiveness are outlined. The following topics are discussed: human factors aspects of control room design; design of interactive systems; human computer dialogue, interaction tasks and techniques; guidelines on ergonomic aspects of control rooms and highly automated environments; system engineering for control by humans; conceptual models of information processing; information display and interaction in real time environments

Systems analysis methodology for large scale systems

The objective is to develop a systematic approach for defining and evaluating alternative strategies for developing data processing and management systems. Various techniques and systems engineering tools are integrated to develop and present to the analysts and users an early definition of services desired along with probable and compatible operations concepts. Information is presented in the form of outlines, graphs and charts

Space Network Control Conference on Resource Allocation Concepts and Approaches

The results are presented of the Space Network Control (SNC) Conference. In the late 1990s, when the Advanced Tracking and Data Relay Satellite System is operational, Space Network communication services will be supported and controlled by the SNC. The goals of the conference were to survey existing resource allocation concepts and approaches, to identify solutions applicable to the Space Network, and to identify avenues of study in support of the SNC development. The conference was divided into three sessions: (1) Concepts for Space Network Allocation; (2) SNC and User Payload Operations Control Center (POCC) Human-Computer Interface Concepts; and (3) Resource Allocation Tools, Technology, and Algorithms. Key recommendations addressed approaches to achieving higher levels of automation in the scheduling process

Selection of Motor Oil

SummaryKnowledge of different types and classifications of crankcase oils means savings when selecting motor lubricants. In many cases farmers take recommendations of dealers and salesmen when buying oils, because of confusion on types and grades, different engines and conditions under which engines operate.Crankcase oils perform four main functions in internal combustion engines. They are:I. Lubricating- this is accomplished by forming a protective film between bearing surfaces to prevent metal to metal contact. Friction and abrasive wear is reduced.2. Sealing - oil forms a seal between piston, rings and cylinder wall to prevent loss of power and crankcase contamination.3. Cooling - oil helps to carry away a large amount of heat produced in the engine.4. Cleaning - oil aids in keeping engines clean by holding impurities or sediments in suspension and reducing deposit formation.Some other functions include: reducing noise, cushioning shock, and protection of parts. How well these functions are performed depends on type and quality of oil used in the engine