In plane stress analysis

An investigation of the blowing up of UK numerical results for the inplane stress calculations for silicon ribbon is presented. The inplane stress that exists in a thin plate is governed by two general equations of equilibrium and compatibility

Shock absorbing mount for electrical components

A shock mount for installing electrical components on circuit boards is described. The shock absorber is made of viscoelastic material which interconnects the electrical components. With this system, shocks imposed on one component of the circuit are not transmitted to other components. A diagram of a typical circuit is provided

Stress and buckling analysis

An analysis is presented of elastic stress and buckling behavior due to thermal stresses in silicon ribbon. Thermal profiles for reducing stresses and improving flatness in wide ribbon are discussed

A Gang Of Pirates : The Confederate Lighthouse Raids in Southeast

In July of 1861, three months after Confederate gunners opened fire on Fort Sumter igniting the Civil War, a distinguished group of United States Army, Navy, and civilian officials met in Washington, DC. These men, Flag Officer Samuel F. DuPont, Commander Charles H. Davis, Major John G. Barnard, and Superintendent Alexander D. Bache of the United States Coast and Geodetic Survey, had been appointed by the Navy Department as a blockade board to study the geography and topography of the southern coastline, the state of Federal naval resources and manpower, and the strategic and tactical plans necessary to make President Lincoln’s frequently ridiculed blockade of the Confederate States a reality. Meeting throughout the summer and early fall, the board prepared a series of reports giving detailed descriptions of the Confederate shore and recommending the division of blockading forces into sections. Commenting on the southern Atlantic coast of Florida in their July 26 report, the board dismissed the region with the statement that it “can hardly be said to be inhabited, and is of no great consequence except as a convenient place of resort for pirates.“ Although this statement reflected the common perception of southeast Florida during the mid-nineteenth century, events would soon prove it notably shortsighted

A Study to Determine the Effectiveness of the Leadership Development 2001 Program at Volvo Trucks North America, Inc\u27s., New River Valley Truck Plant

The objectives of this study were to: 1. Identify the influence the Leadership Development 2001 program had on the successful training participants\u27 leadership behaviors; 2. Identify the difference in perception of attainment of leadership behaviors among immediate supervisors, peers and immediate subordinates and the participants; 3. Assess the ability of the Leadership Development 2001 program to develop leadership traits as found in the Campbell Leadership Index in successful participants

Aerodynamic characteristics of a hypersonic research airplane concept having a 70 deg swept double-delta wing at Mach number 0.2

A wind-tunnel of the static longitudinal, lateral and directional stability characteristics of a hypersonic research airplane concept having a 70 deg swept double-delta wing was conducted in the Langley low-turbulence pressure tunnel. The configuration variables included wing planform, tip fins, center fin, and scramjet engine modules. A mach number of 0.2 was investigated over a Reynolds number (based on fuselage length) range of 2,200,000 to 19.75 x 1,000,000 (with a majority of tests at 10.0 x 1,000,000. Tests were conducted through an angle-of-attack range from about -2 deg to 34 deg at angles of sideslip of 0 deg to 5 deg, and at elevon deflection of 0 deg, -5 deg, -10 deg, -15 deg, and -20 deg. The drag coefficient of the integrated scramjet engine appears relatively constant with Reynolds number at the test Mach number of 0.2. Mild pitch-up was exhibited by the models equipped with tip fins. The forward delta, a highly swept forward portion of the wing, was destabilizing. The center fin model has a higher trimmed maximum lift-drag ratio and a wider trim lift and angle-of-attack range than the tip fin model. Both the tip fin models and center fin models exhibited positive dihedral effect and positive directional stability. Roll control was positive for the tip fin model, but yaw due to roll control was unfavorable

Stress-strain analysis of silicon ribbon

Temperature profiles for silicon ribbon are presented. Ribbon dislocations and elastic stress are discussed. Ribbon quality is important for the ribbon's function as a solar cell

Shape-dependent Depinning of a Domain Wall by a Magnetic Field and a Spin-Polarized Current

The effect of sample shape on the depinning of the domain wall (DW) driven by an applied magnetic field or a spin-polarized current is studied theoretically. The shape effect resulting from the modulation of the sample width (geometric pinning) can essentially affect the DW depinning. We found a good agreement between the ratios of the critical values of the magnetic field and the spin-polarized current predicted by the theory and measured in the experiment.Comment: 9 pages, 5 figure

Herbicide Evaluation in Arkansas Rice, 1997

Weed control is economically important for production of rice, a major crop in Arkansas. These findings summarize efforts of the team of Arkansas scientists working on weed control strategies for rice during 1997. Various technologies were evaluated in field studies at five locations involving the major weed problems and rice production systems used in the state. Results from these studies will add to the arsenal of weed control options for producers. Highlights include synergists and safeners for herbicides to aid in control of propanil-resistant barnyardgrass; herbicides and flooding techniques for control of red rice and other weeds; and the use of transgenic rice cultivars for broadspectrum weed control. The preliminary results reported here generally warrant further testing for more advanced findings and for the labeling of new technologies, and finally are the basis for updating safe, effective, and economical recommendations to Arkansas rice producers