Polarization fluctuations in vertical cavity surface emitting lasers: a key to the mechanism behind polarization stability

We investigate the effects of the electron-hole spin dynamics on the polarization fluctuations in the light emitted from a vertical cavity surface emitting laser (VCSEL). The Langevin equations are derived based on a rate equation model including birefringence, dichroism, and two carrier density pools seperately coupled to right and left circular polarization. The results show that the carrier dynamics phase lock the polarization fluctuations to the laser mode. This is clearly seen in the difference between fluctuations in ellipticity and fluctuations in polarization direction. Seperate measurements of the polarization fluctuations in ellipticity and in polarization direction can therefore provide quantitative information on the non-linear contribution of the carrier dynamics to polarization stability in VCSELs.Comment: 6 pages RevTex and 3 figures, to be published in Quantum and Semiclassical Optics, minor changes to the discussion of timescale

Efficiency of aerosol collection on wires exposed in the stratosphere

The theory of inertial impaction is briefly presented. Stratospheric aerosol research experiments were performed duplicating Wong et al. experiments. The use of the curve of inertial parameters vs particle collection efficiency, derived from Wong et al., was found to be justified. The results show that stratospheric aerosol particles of all sizes are collectible by wire impaction technique. Curves and tables are presented and used to correct particle counts for collection efficiencies less than 100%

The Philippine Economy During the Japanese Occupation

The economy of the Philippines was derailed by the Japanese occupation during World War II. As an American colony before World War II, the Philippines had close amicable ties with the United States highlighted by promises of independence on July 4th, 1946. The Philippines also maintained a beneficial economic relationship with the States at this time through extensive foreign trade. However, because of the Japanese invasion, the Philippine economy was robbed of this profitable foreign trade and the promise of independence, severely crippling the island nation and her morale. The first policies implemented by Japan were designed to control the local economy. These include the closure of Western banks and control of local currency, which caused inflation to increase at an uncontrollable pace. The reorganization of the Philippines’ formerly profitable industries, such as sugar, caused these industries to collapse, leading to vast unemployment across the archipelago. With a shortage of viable fuel, a deteriorating supply chain management, and poor policy implementation, food shortages were common in the Philippines. While ethnic Chinese capital staved off some negative effects during and after the occupation, the Japanese administrative decisions would haunt the country for decades after 1945. Utilizing the economic theory of Gresham’s law and analysis of the policies, situations, and circumstances of the time, a calculation of the reduction of Gross Domestic Product (GDP) by 70 percent at the end of 1945 can be estimated, characterized by a 137,500 percent increase in the price of rice over the course of the Japanese occupation. This staple household food reflects the damage caused by Japan’s economic actions in the Philippines by the end of the war

Port of Portland’s Marine Terminal 6 Contribution to Regional Economic Development

Container cargo shipping service returned to the Port of Portland in Oregon in January 2020 with the regular weekly SM Line service, following more than three years of no container shipping service. Following the global supply chain changes associated with COVID -19, the number of monthly vessel calls at the Port of Portland’s deep-water berth at Terminal 6 has increased regularly to 12 vessel calls in January of 2022. In March of 2022, the largest containership to transit the Columbia river – at 1,100 feet length with capacity of 8,200 containers – arrived at the Port of Portland. The return of container cargo service to the Port of Portland has expanded the effective capacity of international freight movement to and from the Pacific Northwest region of the United States. Early indications are that the Port of Portland T6 container service has the potential to significantly contribute to regional economic growth in the Pacific Northwest region. In 2021, the Port of Portland updated its long - term container cargo forecast, which currently shows a projected compound annual growth rate (CAGR) of 2.9% in the reference case scenario and 3.9% CAGR in the high growth scenario.https://pdxscholar.library.pdx.edu/trec_seminar/1230/thumbnail.jp

Sweetheart Days

https://digitalcommons.library.umaine.edu/mmb-vp/4814/thumbnail.jp