Variable sweep aircraft Patent

Development and characteristics of variable sweep wing control system for supersonic aircraf

The calibration of photographic and spectroscopic films. The utilization of the digital image processor in the determination of aging of the surf clam (Spisula solidissima)

The age of the surf clam (Spisula solidissima) can be determined with the use of the Digital Image Processor. This technique is used in conjunction with a modified method for aging, refined by John Ropes of the Woods Hole Laboratory, Massachusetts. This method utilizes a thinned sectioned chondrophore of the surf clam which contains annual rings. The rings of the chondrophore are then counted to determine age. By digitizing the chondrophore, the Digital Image Processor is clearly able to separate these annual rings more accurately. This technique produces an easier and more efficient way to count annual rings to determine the age of the surf clam

The Trapped Polarized Fermi Gas at Unitarity

We consider population-imbalanced two-component Fermi gases under external harmonic confinement interacting through short-range two-body potentials with diverging s-wave scattering length. Using the fixed-node diffusion Monte Carlo method, the energies of the "normal state" are determined as functions of the population-imbalance and the number of particles. The energies of the trapped system follow, to a good approximation, a universal curve even for fairly small systems. A simple parameterization of the universal curve is presented and related to the equation of state of the bulk system.Comment: 4 pages, 2 tables, 2 figure

The maximum density droplet to lower density droplet transition in quantum dots

We show that, Landau level mixing in two-dimensional quantum dot wave functions can be taken into account very effectively by multiplying the exact lowest Landau level wave functions by a Jastrow factor which is optimized by variance minimization. The comparison between exact diagonalization and fixed phase diffusion Monte Carlo results suggests that the phase of the many-body wave functions are not affected much by Landau level mixing. We apply these wave functions to study the transition from the maximum density droplet state (incipient integer quantum Hall state with angular momentum L=N(N-1)/2) to lower density droplet states (L>N(N-1)/2).Comment: 8 pages, 5 figures, accepted for publication in Phys. Rev.

Leech Parasitism of the Gulf Coast Box Turtle, Terrapene carolina major (Testudines:Emydidae) in Mississippi, USA

Ten leeches were collected from a Gulf Coast box turtle, Terrapene carolina major, found crossing a road in Gulfport, Harrison County, Mississippi, USA. Eight of the leeches were identified as Placobdella multilineata and 2 were identified as Helobdella europaea. This represents the second vouchered report of leeches from a box turtle. Helobdella europaea is reported for the first time associated with a turtle and for the second time from the New World

An evaluation of helicopter noise and vibration ride qualities criteria

Two methods of quantifying helicopter ride quality; absorbed power for vibration only and the NASA ride comfort model for both noise and vibration are discussed. Noise and vibration measurements were obtained on five operational US Army helicopters. The data were converted to both absorbed power and DISC's (discomfort units used in the NASA model) for specific helicopter flight conditions. Both models indicate considerable variation in ride quality between the five helicopters and between flight conditions within each helicopter

Nutrient uptake by soybeans on two Iowa soils

Although the soybean was introduced into the United States in 1804, it is only recently that its production has increased to the point where as a cash-grain crop it ranks fourth in the United States and second in the Midwest. It is perhaps owing to the relatively new status of the soybean as an important crop that the soil fertility requirements are not as yet well understood. Notwithstanding the fact that soybean yields increase with the fertility level of the soil, experiments in the Midwest have shown in general that soybeans do not give the profitable response to direct application of fertilizer that is obtained with corn. The yield increases produced by direct application of fertilizers are comparatively small and unpredictable. This behavior may result from plant characteristics that have been classified as feeding power or it may result from a lack of knowledge of the plant in relation to its environment so that advantage is not taken of the proper means to bring about a profitable increase in yield from fertilizer application. Regarding\u27 the latter point, Norman (20) has suggested that information on the nutritional needs of the plant during its various stages of growth might be of considerable value in the experimental approach to the soil fertility problems of the soybean. To obtain such information for soybeans grown in the field on two Iowa soils differing widely in fertility level was the primary object of the present investigation

The effects of early rheumatoid arthritis on dominant and non-dominant hand impairment and function

Rheumatoid arthritis (RA) is defined as a symmetrical disease yet there is evidence that hand joint damage sustained in RA is related to use, and hand dominance could affect the degree of structural impairment evident in the wrist and hand. This exploratory research aimed to examine the relationship of dominant and non-dominant wrist and hand joint impairment and function in an early rheumatoid population. A multi-centre cohort study was conducted, recruiting consenting patients with early rheumatoid arthritis from eight outpatient occupational therapy departments. Wrist and hand joint impairment and function were assessed by measuring joint pain and swelling, range of motion and joint deviation, handgrip and hand dexterity. The results demonstrated that the non-dominant hand showed less pathological structural and functional involvement than the dominant hand in all but one outcome measure. These differences reached statistical significance between dominant and non-dominant hands on active range of motion in the wrist and some digits. Dominant hand structural impairment and dysfunction in this early RA sample was consistently greater than the non-dominant hand and bilateral handgrip ratio did not reflect healthy values for norms. Individuals with early RA showed a greater level of impairment in their dominant hands