Characterization of cavity flow fields using pressure data obtained in the Langley 0.3-Meter Transonic Cryogenic Tunnel

Static and fluctuating pressure distributions were obtained along the floor of a rectangular-box cavity in an experiment performed in the LaRC 0.3-Meter Transonic Cryogenic Tunnel. The cavity studied was 11.25 in. long and 2.50 in. wide with a variable height to obtain length-to-height ratios of 4.4, 6.7, 12.67, and 20.0. The data presented herein were obtained for yaw angles of 0 deg and 15 deg over a Mach number range from 0.2 to 0.9 at a Reynolds number of 30 x 10(exp 6) per ft with a boundary-layer thickness of approximately 0.5 in. The results indicated that open and transitional-open cavity flow supports tone generation at subsonic and transonic speeds at Mach numbers of 0.6 and above. Further, pressure fluctuations associated with acoustic tone generation can be sustained when static pressure distributions indicate that transitional-closed and closed flow fields exist in the cavity. Cavities that support tone generation at 0 deg yaw also supported tone generation at 15 deg yaw when the flow became transitional-closed. For the latter cases, a reduction in tone amplitude was observed. Both static and fluctuating pressure data must be considered when defining cavity flow fields, and the flow models need to be refined to accommodate steady and unsteady flows

Hidden in Plain Sight: Achieving More Just Results in Hostile Work Environment Sexual Harassment Cases by Re-Examining Supreme Court Precedent

Control of a hydraulic crane is considered. Due to the oscillatory character of the system smooth the operation of the crane is a demanding task. In order to improve the handling properties feedback control of the crane is studied. Based on linearized models feedback regulators of both LQG and PID type are designed. The feedback is based on position, pressure and acceleration measurements. Since the properties of the system change with load and operating point adaptive control is also introduced. The use of accelerometer signals for impact detection is also discussed. The proposed solutions are tested in both simulations and experiments on a real crane

Formulas for ASEP with Two-Sided Bernoulli Initial Condition

For the asymmetric simple exclusion process on the integer lattice with two-sided Bernoulli initial condition, we derive exact formulas for the following quantities: (1) the probability that site x is occupied at time t; (2) a correlation function, the probability that site 0 is occupied at time 0 and site x is occupied at time t; (3) the distribution function for the total flux across 0 at time t and its exponential generating function.Comment: 18 page

Measurements of fluctuating pressure in a rectangular cavity in transonic flow at high Reynolds numbers

An experiment was performed in the Langley 0.3 meter Transonic Cryogenic Tunnel to study the internal acoustic field generated by rectangular cavities in transonic and subsonic flows and to determine the effect of Reynolds number and angle of yaw on the field. The cavity was 11.25 in. long and 2.50 in. wide. The cavity depth was varied to obtain length-to-height (l/h) ratios of 4.40, 6.70, 12.67, and 20.00. Data were obtained for a free stream Mach number range from 0.20 to 0.90, a Reynolds number range from 2 x 10(exp 6) to 100 x 10(exp 6) per foot with a nearly constant boundary layer thickness, and for two angles of yaw of 0 and 15 degs. Results show that Reynolds number has little effect on the acoustic field in rectangular cavities at angle of yaw of 0 deg. Cavities with l/h = 4.40 and 6.70 generated tones at transonic speeds, whereas those with l/h = 20.00 did not. This trend agrees with data obtained previously at supersonic speeds. As Mach number decreased, the amplitude, and bandwidth of the tones changed. No tones appeared for Mach number = 0.20. For a cavity with l/h = 12.67, tones appeared at Mach number = 0.60, indicating a possible change in flow field type. Changes in acoustic spectra with angle of yaw varied with Reynolds number, Mach number, l/h ratios, and acoustic mode number

Different evolutionary pathways underlie the morphology of wrist bones in hominoids

BACKGROUND The hominoid wrist has been a focus of numerous morphological analyses that aim to better understand long-standing questions about the evolution of human and hominoid hand use. However, these same analyses also suggest various scenarios of complex and mosaic patterns of morphological evolution within the wrist and potentially multiple instances of homoplasy that would benefit from require formal analysis within a phylogenetic context.We identify morphological features that principally characterize primate - and, in particular, hominoid (apes, including humans) - wrist evolution and reveal the rate, process and evolutionary timing of patterns of morphological change on individual branches of the primate tree of life. Linear morphological variables of five wrist bones - the scaphoid, lunate, triquetrum, capitate and hamate - are analyzed in a diverse sample of extant hominoids (12 species, 332 specimens), Old World (8 species, 43 specimens) and New World (4 species, 26 specimens) monkeys, fossil Miocene apes (8 species, 20 specimens) and Plio-Pleistocene hominins (8 species, 18 specimens). RESULT Results reveal a combination of parallel and synapomorphic morphology within haplorrhines, and especially within hominoids, across individual wrist bones. Similar morphology of some wrist bones reflects locomotor behaviour shared between clades (scaphoid, triquetrum and capitate) while others (lunate and hamate) indicate clade-specific synapomorphic morphology. Overall, hominoids show increased variation in wrist bone morphology compared with other primate clades, supporting previous analyses, and demonstrate several occurrences of parallel evolution, particularly between orangutans and hylobatids, and among hominines (extant African apes, humans and fossil hominins). CONCLUSIONS Our analyses indicate that different evolutionary processes can underlie the evolution of a single anatomical unit (the wrist) to produce diversity in functional and morphological adaptations across individual wrist bones. These results exemplify a degree of evolutionary and functional independence across different wrist bones, the potential evolvability of skeletal morphology, and help to contextualize the postcranial mosaicism observed in the hominin fossil record

The Impact of Market Economy Transition on Social Security and Social Welfare in Poland

The development of certain facets of Poland\u27s social protection system since the collapse of state socialism in 1989 is analyzed using a comparative policy process analysis model. Particulara ttention is given to the programs of social assistance, child-care and family benefits, and old-age pensions in the Polish context. On the basis of the analysis it is argued that policy makers should give greater consideration to Poland\u27s unique historical and cultural experience relative to addressing social issues

Review of \u3cem\u3eReforming Social Security for Ourselves and Our Posterity.\u3c/em\u3e Charles P. Blahous III. Review by Martin B. Tracy

Book review of Charles P. Blahous III, Reforming Social Security for Ourselves and Our Posterity. Westport, CT: Praegar Publishers, 2000. $39.95 hardcove

Review of \u3cem\u3eSocial Security, the Economy and Development.\u3c/em\u3e James Midgley and Kwong Leung Tang (Eds.). Reviewed by Martin B. Tracy.

Book review of James Midgley and Kwong-Leung Tang (Eds.), Social Security, the Economy and Development. New York: Palgrave Macmillan, 2008. $85.00 hardcover

Business School_BUA 330 Employment Law Paper

Employment Law Paper for University of Maine Course BUA 330 class on Mandatory Paid Sick Leave, from Tracy B. Bigney, Cooperating Instructor, Maine Business School

The Social Security Controversy: Does the Solution Ignore the Problem?

In 1982 the income levels of 18 percent of women age 65 and over were below the poverty line compared to 7.6 percent of men in the same age group (Kutza, 1982). The reasons for a higher incidence of poverty among older women are often correctly attributed to the generally unfavorable position of women in the labor market. A less frequently discussed contributing factor is the programmatic deficiency of old-age pensions under social security. Two fundamental aspects of old-age pensions have been particularly unresponsive to meeting the economic needs of older women. These are: 1) relating income protection to paid employment; and 2) favoring the needs of families over those of individuals (Campbell, 1982). There is good reason to be concerned with the increasing impact that these program characteristics have on the benefit levels of a significant proportion of elderly women. From 1975 to 1983, for example, the average pension received by all women beneficiaries as a proportion of that received by men dropped from 80 percent to 77 percent. Further, the average aeN award to woman in 1982 was 63 percent of the average new award to men compared to 72 percent in 1975 (Social Security Bullein, 1983)