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Sökning: WFRF:(Carlberg L)

  • Resultat 21-30 av 51
  • Föregående 12[3]456Nästa
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21.
  • Persson, Mats, 1954-, et al. (författare)
  • 1999 WHO/ISH Guidelines applied to a 1999 MONICA sample from northern Sweden
  • 2002
  • Ingår i: Journal of Hypertension. - : Lippincott Williams & Wilkins. - 0263-6352 .- 1473-5598. ; 20:1, s. 29-35
  • Tidskriftsartikel (refereegranskat)abstract
    • Background : Treating hypertension with drugs is so far the most cost-effective way to reduce this important risk factor for cardiovascular disease (CVD). It is, however, important to determine absolute risk, and thereby estimate indication for drug treatment, in order to maintain a cost-effective drug treatment. WHO/ISH Hypertension Guidelines from 1999 propose a risk stratification for estimating absolute risk for CVD based on blood pressure and additional risk factors, target organ damage (TOD) and CVD. Objectives : We studied the consequences of applying the recent WHO/ISH risk stratification scheme to a MONICA sample of 6000 subjects from a geographically defined population in northern Sweden, regarding indications for treatment, target blood pressure and risk distribution. Methods : We have risk-classified each of these patients using a computer program, according to the WHO/ISH scheme. Data on TOD were not available. Results : In all, 917 (15%) had drug-treated hypertension. Three-quarters (n = 737) were inadequately treated, with blood pressure levels at or above 140 or 90 mmHg. 1773 (30% of 5997) untreated subjects had a blood pressure of 140/90 or above; 16% in the low-, 62% in the medium-, 8% in the high-, and 14% in the very-high-risk group. The corresponding risk-group pattern for the inadequately treated hypertensives (n = 737) was 5.5, 48.3, 11.1 and 35.2%, respectively. If we shifted the target blood pressure from below 140/90 to below 130/85 for drug-treated subjects under 60 (n = 278) the number of inadequately treated subjects increased by 34 (12.2% of 278); 14 in the low-risk group, 15 in the medium-risk group, and only five in the high- or very-high-risk groups. Conclusions : Only one-fifth of the drug-treated hypertensives were well controlled. Moreover, the incidence of newly detected blood pressure elevation was high. The majority of younger subjects with high blood pressure had low risk, but in those aged 45-54 this had already risen to a medium risk. Changing the target blood pressure to below 130/85, for subjects aged below 60, as recommended by WHO/ISH, affects predominantly low- and medium-risk groups.
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22.
  • Persson, Mats, 1954-, et al. (författare)
  • Evaluation of a computer-based decision support system for treatment of hypertension with drugs : retrospective, nonintervention testing of cost and guideline adherence
  • 2000
  • Ingår i: Journal of Internal Medicine. - : John Wiley & Sons. - 0954-6820 .- 1365-2796. - 0954-6820 ; 247:1, s. 87-93
  • Tidskriftsartikel (refereegranskat)abstract
    • Objective. To evaluate a computerized decision support system (DSS) for drug treatment of hypertension, regarding quality, safety, and cost compared to actual antihypertensive drug treatment.Design. The medical profiles of 338 hypertensive patients treated with drugs against hypertension were processed by the DSS. The drug treatment proposed by the system was then compared to actual treatment given by their physician.Setting. Four health centres in the county of Västerbotten, in Sweden.Subjects. A list of hypertensive patients was extracted from the computerized medical records of each health centre and every fifth patient’s medical profile was assessed by the system.Interventions. None.Main outcome measures. Drug used, drug used in relation to certain major diseases such as diabetes mellitus, asthma, ischaemic heart disease (IHD), and previous myocardial infarction. Adherence to hypertension guidelines, safety, and cost.Results. The DSS suggested significantly more thiazides and significantly fewer calcium antagonists than the physicians had prescribed, with a total cost reduction of 33–40%, depending on doses chosen. The DSS drug profile was more adherent to guidelines in patients with major complicating diseases, suggesting an improvement in treatment quality for these patients by the DSS.Conclusion. The DSS which fully implements current guidelines may improve the quality of antihypertensive treatment, concurrently leading to a considerable reduction in drug costs.
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23.
  • Sun, S., et al. (författare)
  • Thermal performance characterization of nano thermal interface materials after power cycling
  • 2012
  • Ingår i: Proceedings - Electronic Components and Technology Conference. - 0569-5503. ; , s. 1426-1430
  • Konferensbidrag (refereegranskat)abstract
    • The need for faster, smaller, and more reliable and efficient products has resulted in increase of heat generated in microelectronic components. The removal of the heat generated is an important issue in electronic packaging. A novel Nano-TIM was developed to improve the heat dissipation of electronics packaging. This paper aims at studying the heat dissipation performance of a new class of nano-structured polymer-metal composite film (Nano-TIM) after power cycling. The new Nano-TIM uses metal to provide continuous thermal pathways while using nano-polymer to control the elasticity of the TIM. Through semiconductor processing and RTD principle, chips including 5*5, 10*10, 20*20, 30*30 (mm 2), were developed to study different size's influence on heat dissipation effect of the Nano-TIM. Additional parameters studied include power effect. RTD is used respectively to measure the junction temperature, and then the R thJC (Junction-to-Case Thermal Resistance) is calculated afterwards. The Transient thermal resistances of the Nano-TIM were also tested by T3Ster method to further study heat dissipation effect of Nano-TIM. The morphologies and interaction between the Nano-TIM and chips were carefully studied using X-ray Scanning Microscope to analyze heat flow path. The result shows that Nano-TIMs can be used to 30 mm in chip length as the thermal interface material.
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24.
  • Sundström, Johan, Professor, 1971-, et al. (författare)
  • Weight gain and blood pressure
  • 2020
  • Ingår i: Journal of Hypertension. - : Lippincott Williams & Wilkins. - 0263-6352 .- 1473-5598. ; 38:3, s. 387-394
  • Tidskriftsartikel (refereegranskat)abstract
    • OBJECTIVE: Although the causality of the obesity—hypertension association is established, the potential for prevention is not. We hypothesized that weight gain between early adulthood and mid-life is associated with higher mid-life blood pressure.METHODS: We investigated the hypothesis using a large contemporaneous population-based mid-life cohort of men and women aged 50-64 years. Recalled body weight at age 20 years was self-reported, and mid-life body weight and office blood pressures were measured in accordance with a detailed protocol.RESULTS: On average, men had gained 14.9 (95% CI 14.6-15.2) kg of weight, and women 14.6 (95% CI 14.4-14.9) kg, between age 20 years and the mid-life examination, corresponding to 0.40 (95% CI 0.39-0.41) kg/year for men and women. Both weight at age 20 years and weight at the mid-life examination were associated with mid-life blood pressures. On average, a 10 kg weight increase between age 20 years and mid-life was associated with 2.2 (95% CI 0.9-3.5) mmHg higher systolic and 1.7 (95% CI 0.9-2.5) mmHg higher diastolic mid-life blood pressure in men, and 3.2 (2.5-4.0) mmHg higher systolic and 2.4 (1.9-2.9) mmHg higher diastolic mid-life blood pressure in women. Mid-life weight was more closely associated than weight at age 20 years with mid-life blood pressure. For a given mid-life weight, blood pressure was higher in persons with higher weight gain from age 20 years.CONCLUSION: In sum, weight gain between early adulthood and mid-life was associated with higher mid-life blood pressure. The magnitude of the association indicates a potentially great public health impact of strategies to prevent weight gain throughout adulthood.
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25.
  • Wang, Xiaofeng, et al. (författare)
  • Evidence for type ia supernova diversity from ultraviolet observations with the hubble space telescope
  • 2012
  • Ingår i: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 749:2, s. 126-
  • Tidskriftsartikel (refereegranskat)abstract
    • We present ultraviolet (UV) spectroscopy and photometry of four Type Ia supernovae (SNe 2004dt, 2004ef, 2005M, and 2005cf) obtained with the UV prism of the Advanced Camera for Surveys on the Hubble Space Telescope. This data set provides unique spectral time series down to 2000 angstrom. Significant diversity is seen in the near-maximum-light spectra (similar to 2000-3500 angstrom) for this small sample. The corresponding photometric data, together with archival data from Swift Ultraviolet/Optical Telescope observations, provide further evidence of increased dispersion in the UV emission with respect to the optical. The peak luminositiesmeasured in the uvw1/F250W filter are found to correlate with the B-band light-curve shape parameter Delta m(15)(B), but with much larger scatter relative to the correlation in the broadband B band (e.g., similar to 0.4 mag versus similar to 0.2 mag for those with 0.8 mag < Delta m(15)(B) < 1.7 mag). SN 2004dt is found as an outlier of this correlation (at > 3 sigma), being brighter than normal SNe Ia such as SN 2005cf by similar to 0.9 mag and similar to 2.0 mag in the uvw1/F250W and uvm2/F220W filters, respectively. We show that different progenitor metallicity or line-expansion velocities alone cannot explain such a large discrepancy. Viewing-angle effects, such as due to an asymmetric explosion, may have a significant influence on the flux emitted in the UV region. Detailed modeling is needed to disentangle and quantify the above effects.
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26.
  • Zhang, L., et al. (författare)
  • Study on the adhesion strength of new nano-structured polymer-metal composite for thermal interface material (Nano-TIM) under different pressures
  • 2011
  • Ingår i: Proceedings - 12th International Conference on Electronic Packaging Technology and High Density Packaging, ICEPT-HDP 2011, Shanghai, 8-11 August 2011. ; , s. 426-429
  • Konferensbidrag (refereegranskat)abstract
    • With the continual increase in cooling demand for microprocessors, the microelectronics industry has been increasingly focused on the development of thermal solutions. Thermal Interface Material (TIM) plays a key role in reducing the thermal resistance of packaging and the thermal resistance between the electronic device and the external cooling components. Nano-TIM, a new type of thermal interface material, was developed to improve the heat dissipation of electronic devices. This paper describes work undertaken to research the reliability of Nano-TIM. Pull tests were used to investigate the shear strength of samples with Nano-TIM of different thicknesses coalesced between two PCBs with Sn coating made under different pressure. Scanning Electron Microscopy (SEM) analysis techniques were used to determine the morphology of the shear fracture section after pull tests and observe the structure of the cross section of Nano-TIM coalesced between two PCBs with Sn coating.
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27.
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28.
  • Carlberg, Björn, 1983, et al. (författare)
  • Polymer-metal nanofibrous composite for thermal management of microsystems
  • 2012
  • Ingår i: Materials Letters. - 0167-577X. ; 75, s. 229-232
  • Tidskriftsartikel (refereegranskat)abstract
    • In this letter, a composite structure based on a porous electrospun polyimide structure infiltrated with indium aimed at thermal interface material applications is presented. A porous nanofibrous structure was prepared by electrospinning of polyimide. An interfacial nanocomposite layer of silver nanoparticles partially or fully embedded in the polyimide matrix was synthesized on the fiber surfaces, followed by autocatalytic deposition of a uniform silver coating (using the interfacial layer as an anchored seed layer) serving as a reactive wetting layer for the infiltrating melt. The thermal performance of the composite was evaluated and the thermal conductivity was determined to be 27 W/mK, accompanied by low contact resistance of the metallurgical bond (
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29.
  • Carlberg, Björn, 1983, et al. (författare)
  • Polymer nanofiber based continuous metal phase composite for thermal management applications
  • 2010
  • Ingår i: 3rd Electronics System Integration Technology Conference, ESTC 2010; Berlin; Germany; 13 September 2010 through 16 September 2010. ; , s. Art. no. 5642950-
  • Konferensbidrag (refereegranskat)abstract
    • A new composite design approach for thermal interface materials is presented. A porous electro spun nanofiber network composed of temperature stable poly imide was infiltrated with liquid phase indium at a pressure of 30 MPa. The polymer phase defmes composition and geometry, while the continuous metal phase gives binding to surfaces and high thermal conductivity. The composite was characterized by assembly of tri-layer copper/TIM/copper sandwich structures and subsequent xenon flash measurements extracting the thermal properties of the intermediate TIM layer. The interfacial contact resistance was found to be 8 Kmm2/W and the thermal conductivity was 28 W/mK, indicating the potential for use in thermal management applications.
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30.
  • Carlberg, Björn, 1983, et al. (författare)
  • Surface-Confined Synthesis of Silver Nanoparticle Composite Coating on Electrospun Polyimide Nanofibers
  • 2011
  • Ingår i: Small. - 1613-6810 .- 1613-6829. ; 7:21, s. 3057-3066
  • Tidskriftsartikel (refereegranskat)abstract
    • A methodology for fabricating hierarchical nanostructures by surface-confined synthesis of silver nanoparticles on electrospun polyimide nanofibers is reported. Through surface-confined imide cleavage at the dianhydride domain via immersion in an aqueous KOH solution, potassium polyamate coatings of accurately defined thickness are formed (at a rate of 25 nm h(-1)). By utilizing the ion-exchange capability of the polyamate resin, silver ions are introduced through immersion in an aqueous AgNO(3) solution. Subsequent reduction of the metal ion species leads to the formation of nanoparticles at the fiber surface. Two modes of reduction, chemical and thermal, are investigated in the report, each leading to distinct morphologies of the nanoparticle coatings. Via thermal reduction, a composite surface layer consisting of monodisperse silver nanoparticles (average diameter 5.2 nm) embedded in a re-imidized polyimide matrix is achieved. In the case of chemical reduction, the reduction process occurs preferentially at the surface of the fiber, leading to the formation of silver nanoparticles anchored at the surface, though not embedded, in a polyamic acid matrix. By regulating the modification depth, control of the particle density on the fiber surface is established. In both reduction approaches, the polyimide nanofiber core exhibits maintained integrity.
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  • Resultat 21-30 av 51
  • Föregående 12[3]456Nästa
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