Dynamics of wind-driven upwelling and relaxation between Monterey Bay and Point Arena: Local-, regional-, and gyre-scale controls

In north and central California, equatorward winds drive equatorward flows and the upwelling of cold dense water over the shelf during the midspring and summer upwelling season. When the winds temporarily weaken, the upwelling flows between Point Reyes and Point Arena relax,\u27\u27 becoming strongly poleward over the shelf. Analytical and numerical models are used to describe the effect of alongshore variability of winds, bathymetry, and basin-scale pressure gradients on the strength of upwelling and its relaxation. Alongshore winds weaken to the south of Point Reyes, and the shelf becomes narrower from Point Reyes to Monterey Bay. Both of these lead to reduced upwelling at and to the north of Point Reyes, causing an alongshore gradient of temperature and density on the shelf. These alongshore gradients lead to an along-isobath pressure gradient over the shelf that drive the relaxation flows. A simple analytical model is used to explain the dynamics, magnitude, and structure of the relaxation flows. The modeling also suggests that the depth of origin of the upwelled waters, and thus their temperature, is controlled by the along-isobath pressure gradient that exists over the continental slope. This along-slope pressure gradient is also responsible for the California undercurrent in this region. This pressure gradient is not generated in a model of the Californian coast extending from 32 degrees N to 42 degrees N and integrated for several months, suggesting it is caused by dynamics whose spatial or temporal scales are larger than the Californian coast and/or longer than several months

The All China Federation of Trade Unions: the challenge of labour unrest

This thesis sets out to investigate the possibility that the All China Federation of Trade Unions is capable of reform in the face of the development of capitalist employment relations. The thesis is centred on the examination of hitherto under-researched areas of ACFTU activity by researching the motivations, conditions and actors involved in three local-level pilot projects: collective bargaining, a trade union rights centre and enterprise-level trade union elections. The fieldwork is contextualised by historical summaries of the development of China‟s industrial relations and Party and trade union responses to labour unrest in both the state and private sectors since the establishment of the People‟s Republic in 1949. The results of my research demonstrate that it is no longer appropriate to refer to the ACFTU as a monolithic organisation. Furthermore, my argument departs from mainstream views of the organisation by locating the impetus for trade union reform in the challenge of increasingly sophisticated labour militancy from below, rather than reacting to orders from above. I conclude that while the pilot projects studied each have their own merits and qualifications, taken as a whole they prove that the ACFTU is capable of gradual reform from below. In the light of the improved relations between the ACFTU and the International Trade Union Confederation, this thesis speaks to this fact and aims to contribute to future engagements by expanding the knowledge on which dialogue and trade union exchanges must be based if they are to have any chance of success

The All China Federation of Trade Unions : the challenge of labour unrest

This thesis sets out to investigate the possibility that the All China Federation of Trade Unions is capable of reform in the face of the development of capitalist employment relations. The thesis is centred on the examination of hitherto under-researched areas of ACFTU activity by researching the motivations, conditions and actors involved in three local-level pilot projects: collective bargaining, a trade union rights centre and enterprise-level trade union elections. The fieldwork is contextualised by historical summaries of the development of China‟s industrial relations and Party and trade union responses to labour unrest in both the state and private sectors since the establishment of the People‟s Republic in 1949. The results of my research demonstrate that it is no longer appropriate to refer to the ACFTU as a monolithic organisation. Furthermore, my argument departs from mainstream views of the organisation by locating the impetus for trade union reform in the challenge of increasingly sophisticated labour militancy from below, rather than reacting to orders from above. I conclude that while the pilot projects studied each have their own merits and qualifications, taken as a whole they prove that the ACFTU is capable of gradual reform from below. In the light of the improved relations between the ACFTU and the International Trade Union Confederation, this thesis speaks to this fact and aims to contribute to future engagements by expanding the knowledge on which dialogue and trade union exchanges must be based if they are to have any chance of success.EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Pars plana vitrectomy for diabetic macular edema: a systematic review, meta-analysis, and synthesis of safety literature

Purpose. To assess the risk and benefit of pars plana vitrectomy for diabetic macular edema (DME). Methods. We conducted a systematic literature review using PubMed, EMBASE, Web of Science, and Cochrane Central Database of Controlled Trials until September 2014. The population was patients with DME, intervention vitrectomy, comparator macular laser or observation, and efficacy outcome visual acuity and central retinal thickness (CRT). Safety outcomes were intra- and postoperative surgical complications. The efficacy meta-analysis included only randomized controlled trials. The safety analysis included prospective, retrospective, controlled and uncontrolled studies. Results. Five studies were eligible for the efficacy meta-analysis (n = 127 eyes) and 40 for the safety analysis (n = 1,562 eyes). Combining follow up intervals from 6 to 12 months, the meta-analysis found a non-significant 2 letter visual acuity difference favoring vitrectomy, and a significant 102 micron greater reduction in CRT favoring vitrectomy, but a post-hoc subgroup analysis found that a 6 month CRT benefit reversed by 12 months. The most frequent complications were retinal break (7.1%), elevated intraocular pressure (5.2%), epiretinal membrane (3.3%), and vitreous hemorrhage (2.4%). Cataract developed in 68.6% of 121 phakic eyes. Conclusions. Vitrectomy produces structural and functional improvements in select eyes with DME, but the visual gains are not significantly better than with laser or observation. No major safety concerns were identified

Hubble Space Telescope FUV Spectra of the Post-Common-Envelope Hyades Binary V471 Tauri

We have carried out an analysis of the HST STIS archival spectra of the magnetic white dwarf in the Hyades eclipsing-spectroscopic, post-common envelope binary V471 Tauri, time resolved on the orbit and on the X-ray rotational phase of the magnetic white dwarf. An HST STIS spectrum obtained during primary eclipse reveals a host of transition region/chromospheric emission features including N V (1238, 1242), Si IV (1393, 1402), C IV (1548, 1550) and He II (1640). The spectroscopic characteristics and emission line fluxes of the transition region/chromosphere of the very active, rapidly rotating, K2V component of V471 Tauri, are compared with the emission characteristics of fast rotating K dwarfs in young open clusters. We have detected a number of absorption features associated with metals accreted onto the photosphere of the magnetic white dwarf from which we derive radial velocities. All of the absorption features are modulated on the 555s rotation period of the white dwarf with maximum line strength at rotational phase 0.0 when the primary magnetic accretion region is facing the observer. The photospheric absorption features show no clear evidence of Zeeman splitting and no evidence of a correlation between their variations in strength and orbital phase. We report clear evidence of a secondary accretion pole. We derive C and Si abundances from the Si IV and C III features. All other absorption lines are either interstellar or associated with a region above the white dwarf and/or with coronal mass ejection events illuminated as they pass in front of the white dwarf.Comment: The Astrophysical Journal, May 10, 2012 issue - 16 figure

Direct cost of pars plana vitrectomy for the treatment of macular hole, epiretinal membrane and vitreomacular traction: a bottom-up approach

Purpose The direct cost to the National Health Service (NHS) in England of pars plana vitrectomy (PPV) is unknown since a bottom-up costing exercise has not been undertaken. Healthcare resource group (HRG) costing relies on a top-down approach. We aimed to quantify the direct cost of intermediate complexity PPV. Methods Five NHS vitreoretinal units prospectively recorded all consumables, equipment and staff salaries during PPV undertaken for vitreomacular traction, epiretinal membrane and macular hole. Out-of-surgery costs between admission and discharge were estimated using a representative accounting method. Results The average patient time in theatre for 57 PPVs was 72 min. The average in-surgery cost for staff was £297, consumables £619, and equipment £82 (total £997). The average out-of-surgery costs were £260, including nursing and medical staff, other consumables, eye drops and hospitalisation. The total cost was therefore £1634, including 30 % overheads. This cost estimate was an under-estimate because it did not include out-of-theatre consumables or equipment. The average reimbursed HRG tariff was £1701. Conclusions The cost of undertaking PPV of intermediate complexity is likely to be higher than the reimbursed tariff, except for hospitals with high throughput, where amortisation costs benefit from economies of scale. Although this research was set in England, the methodology may provide a useful template for other countries

Dynamics of wind-driven upwelling and relaxation between Monterry Bay and Point Arena : local-, regional-, and gyre-scale controls

In north and central California, equatorward winds drive equatorward flows and the upwelling of cold dense water over the shelf during the midspring and summer upwelling season. When the winds temporarily weaken, the upwelling flows between Point Reyes and Point Arena ‘‘relax,’’ becoming strongly poleward over the shelf. Analytical and numerical models are used to describe the effect of alongshore variability of winds, bathymetry, and basin-scale pressure gradients on the strength of upwelling and its relaxation. Alongshore winds weaken to the south of Point Reyes, and the shelf becomes narrower from Point Reyes to Monterey Bay. Both of these lead to reduced upwelling at and to the north of Point Reyes, causing an alongshore gradient of temperature and density on the shelf. These alongshore gradients lead to an along-isobath pressure gradient over the shelf that drive the relaxation flows. A simple analytical model is used to explain the dynamics, magnitude, and structure of the relaxation flows. The modeling also suggests that the depth of origin of the upwelled waters, and thus their temperature, is controlled by the along-isobath pressure gradient that exists over the continental slope. This along-slope pressure gradient is also responsible for the California undercurrent in this region. This pressure gradient is not generated in a model of the Californian coast extending from 32°N to 42°N and integrated for several months, suggesting it is caused by dynamics whose spatial or temporal scales are larger than the Californian coast and/or longer than several months