Amplification of tunable, picosecond pulses from a single-mode, short cavity dye laser

The design and performance of an Nd⁺³:YAG pumped, short cavity dye laser-dye amplifier system is reported. This system produces narrow bandwidth, broadly tunable picosecond pulses with energies in the millijoule range.     

Simulation,assessment and technical conclusions from a major accident investigation

This paper is the third in a series which describes and discusses the scientific and technical analysis used to assist the investigation of a major accident involving a Royal Australian Navy helicopter. This particular investigation was a particularly complex one that required transportation of the wreckage from the crash site in Indonesia, at the end of the on-site investigation, to laboratories in Australia for detailed assessment. This paper describes the simulations used to assist the investigation, and the technical conclusions reached about the loss of control of the aircraft. Finally the paper outlines the sequence of events which occurred during the accident, and discusses some key issues involved in the formal investigative processes associated with the Board of Inquiry, and the lessons learned in the process.     

Optimized dairy grazing systems in the northeast United States and New Zealand. II. System analysis.

Factors that optimize milk production from Northeast United States and New Zealand grazing systems are compared using a linear programming model. The objective function maximized gross margin per hectare of land farmed. The experimental design compared the optimum characteristics of each system over a range of milk prices. The Northeast has a shorter grazing season and lower cropping costs than New Zealand. The optimum pasture area was 49% of the farm for Northeast systems. Gross margins declined rapidly above 55% or below 36% pasture area. The optimum stocking rate was 1.13 cows/ha, or 2.3 cows/ha of pasture. Optimum per cow production was higher for Northeast [7105 kg of fat-corrected milk (FCM)] than New Zealand (5710 kg of FCM) systems. This was related to lower grain relative to milk prices in the Northeast. New Zealand, all-pasture systems gave the lowest cost per unit of milk but also gave the lowest gross margin across all milk price scenarios. The best use of purchased feed in New Zealand systems was to support increased stocking rate rather than per cow production. Optimum grazing management practices were similar for supplemented New Zealand and Northeast systems. All-pasture New Zealand systems are characterized by short lactations and long autumn rotations to transfer pasture in situ for winter feeding. Higher costs per unit of milk produced will be an inevitable consequence of maximizing gross margin at high milk prices in New Zealand systems.     

Eyedness

Study of the activities of hyaluronidase, lactate dehydrogenase isoenzyme-X and the dehydrogenases of sorbitol, alpha-glycerophosphate, glucose-6-phosphate, malate, glyceraldehyde-3-phosphate and isocitrate in the testes of mice of different ages showed that the changes were correlated with the stages of spermatogenic cell differentiation. The first 4 enzymes had activities which were low in newborn mice and high in adults; this pattern was reversed for the other enzymes.     

Counseling truants back to school: Motivation combined with a program for action.

Conducted a study with 32 13-17 yr old male chronic truants from a low-income, inner-city area. Ss were given counseling aimed at returning them to regular attendance. Optimistic vs threat appeal and presence vs absence of supportive instruction were manipulated in a 2 * 2 design, and persuasion was assessed both as verbal intention to attend school regularly and as actual attendance. Supportive instruction included the continuing availability of a tutor. Results show that threat appeal was sufficient to change intention to return to school, but supportive instruction was necessary to change actual attendance. (PsycINFO Database Record (c) 2010 APA, all rights reserved)