| 61. |
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| 62. |
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| 63. |
- Davani, Hooman A., et al.
(författare)
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Polarization investigation of a tunable high-speed short-wavelength bulk-micromachined MEMS-VCSEL
- 2012
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Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - : SPIE. - 0277-786X .- 1996-756X. - 9780819489197 ; 8276, s. Art. no. 82760T-
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Konferensbidrag (refereegranskat)abstract
- We report the investigation of the state of polarization (SOP) of a tunable vertical-cavity surface-emitting laser (VCSEL) operating near 850 nm with a mode-hop free single-mode tuning range of about 12 nm and an amplitude modulation bandwidth of about 5 GHz. In addition, the effect of a sub-wavelength grating on the device and its influence on the polarization stability and polarization switching has been investigated. The VCSEL with an integrated sub-wavelength grating shows a stable SOP with a polarization mode suppression ratio (PMSR) more than 35 dB during the tuning.
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| 64. |
- Davani, Hooman A., et al.
(författare)
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Widely Electro Thermal Tunable Bulk-Micromachined MEMS-VCSEL Operating Around 850nm
- 2011
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Ingår i: Conference on Lasers and Electro-Optics/Pacific Rim, CLEOPR 2011; Sydney; Australia; 28 August 2011 through 1 September 2011. - 2162-2701. - 9780977565771 ; , s. 32-34
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Konferensbidrag (refereegranskat)abstract
- We present the highest reported continues tuning range of 37 nm and fastest electro thermal tuning speed of 700 Hz achieved with tunable vertical-cavity surface-emitting lasers (VCSEL) and semiconductor DBRs at 850 nm wavelength range.
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| 65. |
- Davani, Hooman A., et al.
(författare)
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Widely tunable high-speed bulk-micromachined short-wavelength MEMS-VCSEL
- 2010
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Ingår i: Semiconductor Laser Conference (ISLC), 2010 22nd IEEE International. - 0899-9406. - 9781424456833 ; , s. 9-10
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Konferensbidrag (refereegranskat)abstract
- We present the first results of a high-speed bulk-micromachined tunable vertical-cavity surface-emitting laser (VCSEL) operating near 850nm using a half-symmetric resonator with a movable curved microelectromechanical system (MEMS) membrane.
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| 66. |
- Dumitrescu, Mihail, et al.
(författare)
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10 Gb/s uncooled dilute nitride optical transmitters operating at 1300 nm
- 2009
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Ingår i: 2009 Conference on Optical Fiber Communication, OFC 2009; San Diego, CA; United States; 22 March 2009 through 26 March 2009. - Washington, D.C. : OSA. - 9781557528650
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Konferensbidrag (refereegranskat)abstract
- Dilute-nitride lasers with record performances have been used to build uncooled transceivers and failure free 10 Gb/s optical transmission was achieved over 815 m of multimode Corning InfiniCor fiber under the LRM standard.
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| 67. |
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| 68. |
- Dumitrescu, M., et al.
(författare)
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Un-Cooled 10 Gb/s dilute-nitride optical transmitters for the 1300 nm wavelength range
- 2008
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Ingår i: 2008 International Semiconductor Conference, CAS 2008; Sinaia; Romania; 13 October 2008 through 15 October 2008. - 9781424420049 ; 1, s. 61-70
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Konferensbidrag (refereegranskat)abstract
- Dilute-nitride-based edge-emitting Fabry-Perot lasers with record performances have been used to build un-cooled optical transceiver modules. The paper presents and analyses some of the achieved performances starting from chip level to optical link transmission experiments. The studies, performed within the EU-FP6 project FAST ACCESS, prove that the dilute-nitride GaInAsN lasers are a good solution for low-cost un-cooled transmitters targeting short and medium distance optical communications in a wide range of applications, from supercomputers and server farms to metropolitan and access area networks.
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| 69. |
- Eggers, Kai M., 1962-, et al.
(författare)
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Prevalence and pathophysiological mechanisms of elevated cardiac troponin 1 levels in a population-based sample of elderly subjects
- 2008
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Ingår i: European Heart Journal. - : Oxford University Press (OUP). - 0195-668X .- 1522-9645. ; 29:18, s. 2252-2258
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Tidskriftsartikel (refereegranskat)abstract
- AIMS: To evaluate the prevalence of cardiac troponin I (cTnI) elevation in an elderly community population and the association of cTnI levels with cardiovascular risk factors, vascular inflammation, atherosclerosis, cardiac performance, and areas indicative of infarcted myocardium identified by cardiac magnetic resonance imaging. METHODS AND RESULTS: cTnI elevation defined as cTnI levels >0.01 microg/L (Access AccuTnI, Beckman Coulter) was found in 21.8% of the study participants (n = 1005). cTnI > 0.01 microg/L was associated with cardiovascular high-risk features, the burden of atherosclerosis in the carotid arteries, left-ventricular mass, and impaired left-ventricular systolic function. No associations were found between cTnI and inflammatory activity, diastolic dysfunction, or myocardial scars. Male gender (OR 1.6; 95% CI 1.1-2.4), ischaemic ECG changes (OR 1.7; 95% CI 1.1-2.7), and NT-pro-brain natriuretic peptide levels (OR 1.4; 95% CI 1.1-1.7) independently predicted cTnI > 0.01 microg/L. cTnI > 0.01 microg/L correlated also to an increased cardiovascular risk according to the Framingham risk score. CONCLUSION: cTnI > 0.01 microg/L is relatively common in elderly subjects and is associated with cardiovascular high-risk features and impaired cardiac performance. Cardiac troponin determined by a highly sensitive assay might thus serve as an instrument for the identification of subjects at high cardiovascular risk in general populations.
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| 70. |
- Eliasson, Gabriella, et al.
(författare)
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Comorbid conditions as predictors of mortality in severe COPD - an eight-year follow-up cohort study
- 2023
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Ingår i: European Clinical Respiratory Journal. - : Taylor & Francis. - 2001-8525. ; 10:1
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: Co-morbidities are common in chronic obstructive pulmonary disease (COPD) and are associated with increased morbidity and mortality. The aim of the present study was to explore the prevalence of several comorbid conditions in severe COPD, and to investigate and compare their associations with long-term mortality.Methods: In May 2011 to March 2012, 241 patients with COPD stage 3 or 4 were included in the study. Information was collected on sex, age, smoking history, weight and height, current pharmacological treatment, number of exacerbations the recent year and comorbid conditions. At December 31st, 2019, mortality data (all-cause and cause specific) were collected from the National Cause of Death Register. Data were analyzed using Cox-regression analysis with gender, age, previously established predictors of mortality and comorbid conditions as independent variables, and all-cause mortality and cardiac and respiratory mortality, respectively, as dependent variables.Results: Out of 241 patients, 155 (64%) were deceased at the end of the study period; 103 patients (66%) died of respiratory disease and 25 (16%) of cardiovascular disease. Impaired kidney function was the only comorbid condition independently associated with increased all-cause mortality (HR (95% CI) 3.41 (1.47-7.93) p=0.004) and respiratory mortality (HR (95%CI) 4.63 (1.61 to 13.4), p = 0.005). In addition, age >= 70, BMI <22 and lower FEV1 expressed as %predicted were significantly associated with increased all-cause and respiratory mortality.Conclusion: In addition to the risk factors high age, low BMI and poor lung function; impaired kidney function appears to be an important risk factor for mortality in the long term, which should be taken into account in the medical care of patients with severe COPD.
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