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Transonic lateral and longitudinal aerodynamic characteristics of a lateral-control system employing rotatable airfoils mounted vertically at the wing tips of an unswept wing-fuselage-tail combination

Description: Report presenting the aerodynamic characteristics of a new type of lateral control through a range of Mach numbers. The control consisted of airfoils mounted vertically at the tips of the wing and could be rotated to induce rolling moments or lift on the wing surface. Results regarding lateral-control characteristics and lift-control characteristics are provided.
Date: January 7, 1958
Creator: Axelson, John A.
Partner: UNT Libraries Government Documents Department

Effects of a detached tab on the hinge-moment and effectiveness characteristics of an unswept trailing-edge control on a 60 degree delta wing at Mach numbers from 0.75 to 1.96

Description: Report presenting an experimental investigation in the blowdown tunnel to determine the balancing effects of a detached tab on a constant-chord trailing-edge control mounted on a 60 degree delta wing for a range of Mach numbers. Control hinge moments, rolling moments, and lift effectiveness of the semispan wing-body combination are provided.
Date: April 14, 1955
Creator: Morris, Odell A. & Westrick, Gertrude C.
Partner: UNT Libraries Government Documents Department

Rocket-model investigation to determine the hinge-moment and normal-force properties of a full-span, constant-chord, partially balanced trailing-edge control on a 60 degree clipped delta wing between Mach numbers of 0.50 and 1.26

Description: Report presenting a free-flight investigation of a rocket-powered research model to determine the hinge-moment and normal-force characteristics of a trailing-edge control on a delta wing between Mach numbers of 0.50 and 1.26. The hinge-line location of 40 percent control chord satisfactorily reduced the high hinge moments associated with plain flap-type controls. Results regarding hinge moments and normal force are provided.
Date: October 30, 1953
Creator: Martz, C. William & Goslee, John W.
Partner: UNT Libraries Government Documents Department

Investigations on the Stability, Oscillation, and Stress Conditions of Airplanes with Tab Control: First Partial Report. Derivation of the Equations of Motion and their General Solutions

Description: For the design and the construction of airplanes the control is of special significance, not only with regard to the flight mechhnical properties but also for the proportional arrangement of wing unit, fuselage, and tail unit. whereas these problems may be regarded as solved for direct control of airplane motions, that is, for immediate operation of the control surfaces, they are not clarified as to oscimtions, stability, and stress phenomena occurring in flight motions with Indirect control, ss realized for instance in tab control. Its modus operandi is based on the activation of a tab hinged to the trailing edge & the main control surface. Due to lift and drag variations, mcments originate about the axis of rotation of the main contnol surface which cause an up-or--down floating of the main control surface and thus a change in the direction of the airplane. Since this tab control means flying with free control surface , the treatment of this problem should provide the basis on which to judge stability, oscilhtton, and stress data.The present report is to represent a contribution toward the clarification of the problems arising and, to treat the longitudinal motion of an airplane.
Date: September 1949
Creator: Filzek, B.
Partner: UNT Libraries Government Documents Department

How Insects Affect the Cotton Plant and Means of Combating Them

Description: "The cotton plant is unusually attractive to insects and probably no other cultivated crop has as large a list of insect enemies. Among these are some of the most destructive pests in the history of agriculture. Many cotton pests come to the cotton from other crops or from weeds around the fields. Weeds should not be allowed to grow. Rotation of crops is of assistance in controlling cotton pests. Poisons seldom are needed, except in poisoned baits in the spring and against red spiders, grasshoppers, and 'worms' when they threaten the crop. Thorough fall plowing, winter cover crops, early spring preparation, and repeated cultivation during the season are important measures of insect control. The cotton plants should be turned under in the fall. This bulletin describes the work of many insects and gives suggestions for their control." -- p. 2. Among the insects discussed are ants, cutworms, may beetles, aphids, grassworms, grasshoppers, bollworms, wireworms, and crickets.
Date: 1917
Creator: Pierce, W. Dwight (William Dwight), 1881-1967
Partner: UNT Libraries Government Documents Department

Cutworms in the garden.

Description: A guide to identifying cutworm interference and controlling cutworms in the garden. Provides information on obtaining and handling arsenic poison.
Date: March 1927
Creator: White, W. H. (William Henry), 1892-1951
Partner: UNT Libraries Government Documents Department

The Rough-Headed Corn Stalk-Beetle in the Southern States and Its Control

Description: "Within recent years an increasing number of reports of serious damage to the corn crop by a robust black beetle have been received from most of the Southern States. A noteworthy outbreak occurred during the early summer of 1914 in the tidewater section of Virginia. As very little was known regarding the natural history of this pest, this bulletin has been designed to supply this information. By following the control measures recommended herein it is hoped that the ravages of this pest may be largely overcome in the future." -- p. 3
Date: 1917
Creator: Phillips, W. J. (William Jeter), 1879-1972
Partner: UNT Libraries Government Documents Department

Grasshoppers and Their Control

Description: "Grasshoppers in a single year have destroyed crops valued at over a hundred million dollars. The best way to prevent losses is the use of poisoned bait supplemented by tillage and seeding methods which restrict egg laying and imprison the young grasshoppers in the ground after they hatch. Bait is most effective while grasshoppers are still on their hatching grounds or massed along field margins. It should be put out when grasshoppers are doing their first feeding of the day. This usually occurs between 6 and 10 a.m. at temperatures of 70° to 80°F. Bait should not be spread unless grasshoppers are actively feeding. In mixing and distributing the poisoned bait care should be taken to prevent injury to persons and farm animals. Seeding grain only on plowed or summer-fallowed ground and plowing infested stubble before the eggs hatch greatly reduces the quantity of bait needed for control and decreases the liability of crop injury. Cooperation in the use of control methods by all the farmers in a community is necessary for best results." -- p. i
Date: 1939
Creator: Parker, J. R.
Partner: UNT Libraries Government Documents Department

The Relationship between Several Personality Variables and a Proposed Trait Model

Description: This thesis proposes three hypotheses: first, that persons with a high generalized expectancy for internal control of reinforcement will react to many of life's situations in a problem-solving or need-persistent way; second, that those persons high in the belief of external control will be more extra-punitive in their reactions to frustrating situations; third, that persons with a high belief in internal control of reinforcement are more ready to learn in chance situations.
Date: January 1968
Creator: Butler, Robert T.
Partner: UNT Libraries

Beliefs of Internal Versus External Control and Their Relationship to Stage of Moral Judgment

Description: This investigation sought to explore the relationship of Julian Rotter's concept of internal versus external control (I-E) to stages of moral judgment. The I-E dimension is defined as the attribution by the individual of responsibility for behavioral outcomes to either oneself or to outside entities. The internal oriented person believes that the events in which he is involved lie within his control. Conversely, the external oriented person believes that the events that happen to him are controlled by other factors.
Date: August 1971
Creator: Coulter, Wylie A.
Partner: UNT Libraries

Maximum rates of control motion obtained from ground tests

Description: Report discusses the results of testing to determine the maximum rates of control stick (elevator) motion and corresponding maximum stick forces that could be exerted based on experiments with several pilots. The main topics explored were the comparison of the maximum rates of push and pull, maximum rates of push and pull when a mental restriction was placed on the pilot, and maximum rates at which the pilot though he would apply the elevator control forces versus the actual application of forces. Information about experimental procedures and the rig the testing occurred on is included.
Date: May 1944
Creator: Beeler, De E.
Partner: UNT Libraries Government Documents Department

Investigation of the low-speed performance and static longitudinal stability and control characteristics of a 60 degree delta-wing-body-tail combination with blowing over trailing-edge flaps

Description: Report presenting an investigation in the full-scale tunnel to determine the effects of boundary-layer control by blowing over trailing-edge flaps on the low-speed performance and static longitudinal stability characteristics of a 60 degree delta wing-body-tail combination with variable flap positioning and leading-edge devices. Results regarding the flap lift characteristics at zero angle of attack, tail-off characteristics, tail-on characteristics, and low-speed performance characteristics are provided.
Date: July 29, 1957
Creator: Scallion, William I. & Cannon, Michael D.
Partner: UNT Libraries Government Documents Department

Investigation of flutter characteristics of three low-aspect-ratio all-movable half-span control surfaces at Mach numbers from 1.49 to 2.87

Description: Report presenting the results of a supersonic flutter investigation of three low-aspect-ratio control surfaces, two which had all-movable controls and one with a fixed cutout. Experimental results are provided and compared to calculations using the piston theory for plan form 2. Modifications for improving the flutter of the various control surfaces are also described.
Date: May 2, 1958
Creator: Morgan, Homer G.; Figge, Irving E. & Presnell, John G., Jr.
Partner: UNT Libraries Government Documents Department

New Horizons and New Strategies in Arms Control

Description: In the last ten years, since the break-up of the Soviet Union, remarkable progress in arms control and disarmament has occurred. The Nuclear Non-Proliferation Treaty (NPT), the completion of the Comprehensive Test Ban Treaty (CTBT), and the Chemical Weapons Treaty (CWC) are indicative of the great strides made in the non- proliferation arena. Simultaneously, the Intermediate Nuclear Forces Treaty (INF), the Conventional Forces Treaty in Europe (CFE), and the Strategic Arms Reduction Treaties (START), all associated with US-Soviet Union (now Russia) relations have assisted in redefining European relations and the security landscape. Finally, it now appears that progress is in the offing in developing enhanced compliance measures for the Biological and Toxin Weapons Convention (BTWC). In sum, all of these achievements have set the stage for the next round of arms control activities, which may lead to a much broader, and perhaps more diffused multilateral agenda. In this new and somewhat unpredictable international setting, arms control and disarmament issues will require solutions that are both more creative and innovative than heretofore.
Date: December 4, 1998
Creator: Brown, J. editor
Partner: UNT Libraries Government Documents Department

A flight investigation of the handling characteristics of a fighter airplane controlled through a rate type of automatic control system

Description: Report presenting an investigation of the handling qualities of a fighter airplane that is controlled by a pilot supplying signals to a rate type of automatic control system. The handling qualities were investigated in pull-ups, aileron rolls, aerobatics, rough-air flying, and precision tasks.
Date: September 14, 1956
Creator: Russell, Walter R.; Sjoberg, S. A. & Alford, William L.
Partner: UNT Libraries Government Documents Department

The Consequences of Implementing Statistical Process Control

Description: This study evaluated the changes which occur in manufacturing organizations in the plastic molding industry which implement statistical process control (SPC). The study evaluated changes in product quality, consistency, cost, changes in employee attitudes, and changes in the organization structure which occur after the implementation of SPC. The study was conducted in two phases. Phase 1 consisted of an exploratory field study of a single manufacturing company. Phase 2 consisted of a field survey of three manufacturing companies in the same industry. An unexpected opportunity to evaluate the differences in effects of successful and unsuccessful SPC implementations occurred during the field survey. One plant, whose management assessed their SPC program as being unsuccessful, reported no economic or quality benefits from SPC. Neither did this plant report any changes in the attitudes or behavior of their employees. Neither of these findings was surprising since this plant was the only one of the four study plants which implemented SPC as a quality control program with no participation from the production department. The three plants whose management assessed their SPC programs as being successful reported reduced product variation and a decrease in the proportion of defective product produced as a result of SPC. No consistent evidence was found concerning a reduction in the material required per product resulting from SPC. No consistent evidence was found linking changes in employee attitudes and behavior to the implementation of SPC. The field study found a significant change in the employees1 attitudes toward management but no change in their attitudes toward the company. The field survey found no evidence of change in either dimension. Evidence was found for a change to a more organic structure during SPC training and to a more mechanistic structure during SPC implementation. The final form of the organization was more organic than ...
Date: August 1990
Creator: Sower, Victor E.
Partner: UNT Libraries

An investigation at transonic speeds of the effects of control chord and span on the control characteristics of a tapered wedge-type wing of aspect ratio 2.5: transonic-bump method

Description: Report presenting an investigation to determine the control characteristics of flap-type controls of various chords and spans on an unswept wing with a modified double-wedge section, an aspect ratio of 2.5, and a taper ratio of 0.625.The control chords in the study were 25, 35, and 45 percent of the wing chord, and the control spans were 25, 50, and 75 percent of the wing semispan. The data from the study indicated that the control-parameter values are approximately proportional to control chord or span for the chords tested.
Date: September 20, 1951
Creator: Vogler, Raymond D.; Lockwood, Vernard E. & Turner, Thomas R.
Partner: UNT Libraries Government Documents Department

A summary and analysis of wind-tunnel data on the lift and hinge-moment characteristics of control surfaces up to a Mach number of 0.90

Description: Report presenting an extensive collection of lift and hinge-moment characteristics of control surfaces up to a Mach number of 0.90 in a high-speed wind tunnel. A wide variety of control-surface profiles, plan forms, and aerodynamic balances are included. Results regarding elevator hinge moments and longitudinal control, aileron hinge moments and lateral control, control-surface characteristics, and transonic flutter are highlighted.
Date: April 30, 1948
Creator: Axelson, John A.
Partner: UNT Libraries Government Documents Department

A theoretical investigation of longitudinal stability of airplanes with free controls including effect of friction in control system

Description: From Summary: "The relation between the elevator hinge-moment parameters and the control forces for changes in forward speed and in maneuvers is shown for several values of static stability and elevator mass balance." Factors affecting stability positively and negatively are presented and potential modifications to the elevator control system are provided. The amount of solid friction present was found to be one of the greatest predictors of instability.
Date: February 1944
Creator: Greenberg, Harry & Sternfield, Leonard
Partner: UNT Libraries Government Documents Department

Controlling Canada Thistles

Description: "This paper deals with the methods of eradication used for the Canada thistle in the United States, states how it is distributed, and how it may be prevented. It also includes a description of the plant so that it may be recognized. It should also be of considerable assistance to any farmer troubled with Canada thistles." -- p. 2
Date: 1913
Creator: Cox, H. R. (Herbert Randolph)
Partner: UNT Libraries Government Documents Department