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  • Disputas: 2019-02-27 13:15 Planck, Fysikhuset, Linköping
    Karhu, Robin
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Halvledarmaterial. Linköpings universitet, Tekniska fakulteten.
    CVD growth of SiC for high-power and high-frequency applications2019Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Silicon Carbide (SiC) is a wide bandgap semiconductor that has attracted a lot of interest for electronic applications due to its high thermal conductivity, high saturation electron drift velocity and high critical electric field strength. In recent years commercial SiC devices have started to make their way into high and medium voltage applications.

    Despite the advancements in SiC growth over the years, several issues remain. One of these issues is that the bulk grown SiC wafers are not suitable for electronic applications due to the high background doping and high density of basal plane dislocations (BPD). Due to these problems SiC for electronic devices must be grown by homoepitaxy. The epitaxial growth is performed in chemical vapor deposition (CVD) reactors. In this work, growth has been performed in a horizontal hot-wall CVD (HWCVD) reactor. In these reactors it is possible to produce high-quality SiC epitaxial layers within a wide range of doping, both n- and p-type.

    SiC is a well-known example of polytypism, where the different polytypes exist as different stacking sequences of the Si-C bilayers. Polytypism makes polytype stability a problem during growth of SiC. To maintain polytype stability during homoepitaxy of the hexagonal polytypes the substrates are usually cut so that the angle between the surface normal and the c-axis is a few degrees, typically 4 or 8°. The off-cut creates a high density of micro-steps at the surface. These steps allow for the replication of the substrates polytype into the growing epitaxial layer, the growth will take place in a step-flow manner. However, there are some drawbacks with step-flow growth. One is that BPDs can replicate from the substrate into the epitaxial layer. Another problem is that 4H-SiC is often used as a substrate for growth of GaN epitaxial layers. The epitaxial growth of GaN has been developed on on-axis substrates (surface normal coincides with c-axis), so epitaxial 4H-SiC layers grown on off-axis substrates cannot be used as substrates for GaN epitaxial growth.

    In efforts to solve the problems with off-axis homoepitaxy of 4H-SiC, on-axis homoepitaxy has been developed. In this work, further development of wafer-scale on-axis homoepitaxy has been made. This development has been made on a Si-face of 4H-SiC substrates. The advances include highly resistive epilayers grown on on-axis substrates. In this thesis the ability to control the surface morphology of epitaxial layers grown on on-axis homoepitaxy is demonstrated. This work also includes growth of isotopically enriched 4H-SiC on on-axis substrates, this has been done to increase the thermal conductivity of the grown epitaxial layers.

    In (paper 1) on-axis homoepitaxy of 4H-SiC has been developed on 100 mm diameter substrates. This paper also contains comparisons between different precursors. In (paper 2) we have further developed on-axis homoepitaxy on 100 mm diameter wafers, by doping the epitaxial layers with vanadium. The vanadium doping of the epitaxial layers makes the layers highly resistive and thus suitable to use as a substrate for III-nitride growth. In (paper 3) we developed a method to control the surface morphology and reduce the as-grown surface roughness in samples grown on on-axis substrates. In (paper 4) we have increased the thermal conductivity of 4H-SiC epitaxial layers by growing the layers using isotopically enriched precursors. In (paper 5) we have investigated the role chlorine have in homoepitaxial growth of 4H-SiC. In (paper 6) we have investigated the charge carrier lifetime in as-grown samples and traced variations in lifetime to structural defects in the substrate. In (paper 7) we have investigated the formation mechanism of a morphological defect in homoepitaxial grown 4H-SiC.

    Delarbeid
    1. The Role of Chlorine during High Growth Rate Epitaxy
    Åpne denne publikasjonen i ny fane eller vindu >>The Role of Chlorine during High Growth Rate Epitaxy
    Vise andre…
    2015 (engelsk)Inngår i: Materials Science Forum, ISSN 0255-5476, E-ISSN 1662-9752, Vol. 821-823, s. 141-144Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    The influence of chlorine has been investigated for high growth rates of 4H-SiC epilayers on 4o off-cut substrates. Samples were grown at a growth rate of approximately 50 and 100 μm/h and various Cl/Si ratios. The growth rate, net doping concentration and charge carrier lifetime have been studied as a function of Cl/Si ratio. This study shows some indications that a high Cl concentration in the growth cell leads to less availability of Si during the growth process.

    sted, utgiver, år, opplag, sider
    Pfaffikon, Switzerland: Scientific.Net, 2015
    Emneord
    Chemical Vapor Deposition (CVD), Chlorine, Doping, Epitaxy, High Growth Rate
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-123951 (URN)10.4028/www.scientific.net/MSF.821-823.141 (DOI)
    Konferanse
    European Conference on Silicon Carbide & Related Materials, Grenoble, France, 21-25 September 2014
    Tilgjengelig fra: 2016-01-14 Laget: 2016-01-14 Sist oppdatert: 2019-02-14bibliografisk kontrollert
    2. Long Charge Carrier Lifetime in As-Grown 4H-SiC Epilayer
    Åpne denne publikasjonen i ny fane eller vindu >>Long Charge Carrier Lifetime in As-Grown 4H-SiC Epilayer
    Vise andre…
    2016 (engelsk)Inngår i: Materials Science Forum, ISSN 0255-5476, E-ISSN 1662-9752, Vol. 858, s. 125-128Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Over 150 μm thick epilayers of 4H-SiC with long carrier lifetime have been grown with a chlorinated growth process. The carrier lifetime have been determined by time resolved photoluminescence (TRPL), the lifetime varies a lot between different areas of the sample. This study investigates the origins of lifetime variations in different regions using deep level transient spectroscopy (DLTS), low temperature photoluminescence (LTPL) and a combination of KOH etching and optical microscopy. From optical microscope images it is shown that the area with the shortest carrier lifetime corresponds to an area with high density of structural defects.

    sted, utgiver, år, opplag, sider
    Trans Tech Publications, 2016
    Emneord
    Carrier Lifetime, Chemical Vapor Deposition (CVD), Chlorine, Epitaxy
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-154468 (URN)10.4028/www.scientific.net/MSF.858.125 (DOI)2-s2.0-84971500767 (Scopus ID)
    Tilgjengelig fra: 2019-02-13 Laget: 2019-02-13 Sist oppdatert: 2019-02-21bibliografisk kontrollert
  • Disputas: 2019-03-01 13:00 I:101, Hus I, Linköping
    Halvarsson Lundkvist, Agneta
    Linköpings universitet, Institutionen för beteendevetenskap och lärande, Pedagogik och sociologi. Linköpings universitet, Filosofiska fakulteten.
    Learning Dynamics of Workplace Development Programmes: Studies in Swedish national programmes2019Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The thesis focuses on workplace development programmes (WPDPs) that operationalize national policies on workplace development. WPDPs are time-limited and they provide support to organizations that aim to improve their operational performance or employees’ work conditions. The support that such programmes provide to organizations consists of competence-development activities provided through networks, courses or hands-on coaching. The supported organizations aimed at changing work practices to increase their operational performance.

    Departing from a workplace-learning perspective, the overall aim of the thesis was to contribute to knowledge about learning in workplace development programmes and the supported organizations when realizing policies on workplace development. A qualitative multiple-case study design was used and a total of 115 interviews and notes from meetings are included in the data material. Four substudies made up the empirical base.

    The findings revealed that realizing policies on workplace development required continuous learning among stakeholders at different levels of the WPDPs. Thus, conditions that enabled learning were important throughout the whole WPDP, which was seen as a large, complex social learning system. Learning between different levels of the WPDP was especially important, which required stakeholder representatives with the appropriate qualifications or characteristics that enabled them to take on roles as brokers between the stakeholders involved in realizing the policy. The overall conclusion pointed towards the dynamics of realizing policies of workplace learning, which cannot be achieved by a one-size-fitsall model for learning.

    The findings imply that funders and other authorities that make policies on workplace development through WPDPs should scrutinize how learning among stakeholders that enter into partnership to operate WPDPs is to be facilitated. Linear plans that are not complemented with careful explanations of how such learning is to be facilitated may constitute warning signs. Furthermore, the findings imply that organizations looking for external support to develop the innovative capabilities of employees must be careful in choosing their support. A WPDP may consume the resources of an organization without providing any benefit, if it does not provide the appropriate support. On the other hand, a WPDP may be a great source for learning, particularly if it includes support in designing the change effort, and help in developing an internal support infrastructure that will continue supporting workplace development after the programme ends.

    Delarbeid
    1. Program steering by learning
    Åpne denne publikasjonen i ny fane eller vindu >>Program steering by learning
    2015 (engelsk)Inngår i: Sustainable development in organizations: studies on innovative practices / [ed] Mattias Elg, Per-Erik Ellström, Magnus Klofsten, Malin Tillmar, Cheltenham: Edward Elgar Publishing, 2015, s. 77-92Kapittel i bok, del av antologi (Fagfellevurdert)
    sted, utgiver, år, opplag, sider
    Cheltenham: Edward Elgar Publishing, 2015
    Emneord
    Organisationsförändringar
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-125518 (URN)000374407200006 ()978-17-8471-688-2 (ISBN)
    Tilgjengelig fra: 2016-02-25 Laget: 2016-02-25 Sist oppdatert: 2019-02-13bibliografisk kontrollert
    2. The role of brokers in a workplace development programme targeting SMEs
    Åpne denne publikasjonen i ny fane eller vindu >>The role of brokers in a workplace development programme targeting SMEs
    2018 (engelsk)Inngår i: European Journal of Training and Development, ISSN 2046-9012, E-ISSN 2046-9020Artikkel i tidsskrift (Fagfellevurdert) Epub ahead of print
    Abstract [en]

    Purpose

    The purpose of this paper is to investigate the development of a workplace development programme (WPDP) targeting small and medium sized manufacturing enterprises (SMEs) by focussing on the people who acted as brokers providing cross-boundary connections between its collaborating partners.

    Design/methodology/approach

    The material, from interviews with 32 individuals and 11 meetings, was analysed in a boundary-crossing framework, which provided tools to reveal how the roles of brokers at different levels (operative, strategic and national) of the WPDP affected its development.

    Findings

    The findings indicate that cross-boundary connections were made by persons who acted as brokers within and between different levels of the WPDP. The brokers who provided cross-boundary connections between different levels of the WPDP were found to play the most important role for the prompt development of the WPDP.

    Originality/value

    Apart from unique empirical material depicting the development of a collaborative venture between national and regional stakeholders of the manufacturing industry, the value of this study is the attention given to the people behind the policymaking of publicly funded national WPDPs, revealing the complex business of developing policy-driven competence development activities to employees in SMEs.

    sted, utgiver, år, opplag, sider
    Emerald Group Publishing Limited, 2018
    Emneord
    SME, Manufacturing industry, Programme development, Broker, Cross-boundary connections, Workplace development programme
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-151603 (URN)10.1108/EJTD-04-2018-0037 (DOI)2-s2.0-85053333619 (Scopus ID)
    Tilgjengelig fra: 2018-09-27 Laget: 2018-09-27 Sist oppdatert: 2019-02-13bibliografisk kontrollert
    3. Learning conditions for continuous improvement in a public service organization
    Åpne denne publikasjonen i ny fane eller vindu >>Learning conditions for continuous improvement in a public service organization
    2018 (engelsk)Inngår i: Journal of Workplace Learning, ISSN 1366-5626, E-ISSN 1758-7859Artikkel i tidsskrift (Fagfellevurdert) Epub ahead of print
    Abstract [en]

    Purpose – This study focuses on a transformation effort in a social welfare department of a Swedish municipality where continuous improvement, which is a Lean principle, was introduced in employees’everyday work via a workplace development programme (WPDP). The aim of this paper is to explore the conditions (internal and external) that enabled or constrained employee learning during the introduction of continuous improvement into employees’ everyday work in a WPDP-supported social welfare department.

    Design/methodology/approach – This case study is based mainly on 22 semi-structured interviews with individuals holding different positions in the department and overarching municipality.

    Findings – The findings show that multiple and emerging conditions, both internal and external, shaped a predominantly restrictive learning environment during the introduction of continuous improvement into the social welfare department. The major conditions identified were related to the initial implementation and top management’s steering and monitoring of the “Lean investment”, activities and support provided by the WPDP, activities and support provided by the internal Lean support team and first-line managers’ abilities to facilitate employee learning.

    Originality/value – Apart from unique empirical material depicting an effort towards change under conditions far from favourable for employee learning, the value of this study lies in the attention given to the external dynamics that drive change in line with the concept of new public management in public service organizations, including a WPDP that supported the social welfare department.

    sted, utgiver, år, opplag, sider
    Emerald Group Publishing Limited, 2018
    Emneord
    Organizational change, learning environment, public service organization, workplace development programmes
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-152661 (URN)10.1108/JWL-03-2018-0049 (DOI)
    Tilgjengelig fra: 2018-11-12 Laget: 2018-11-12 Sist oppdatert: 2019-02-13bibliografisk kontrollert
    4. Conditions for Employee Learning and Innovation: Interweaving Competence Development Activities Provided by a Workplace Development Programme with Everyday Work Activities in SMEs
    Åpne denne publikasjonen i ny fane eller vindu >>Conditions for Employee Learning and Innovation: Interweaving Competence Development Activities Provided by a Workplace Development Programme with Everyday Work Activities in SMEs
    2018 (engelsk)Inngår i: Vocations and Learning, ISSN 1874-785X, E-ISSN 1874-7868, Vol. 11, nr 1, s. 45-63Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    The aim of this article is to investigate how the formal competence development activities provided by the Production Leap, a workplace development programme (WPDP), were interwoven with everyday work activities and to identify the conditions that enabled learning and employee-driven innovation that contributed to production improvement, in small and medium-sized enterprises (SMEs) in Sweden. The study adopts a qualitative case approach and draws on evidence from research conducted in four manufacturing SMEs that participated in this Swedish WPDP. Funded by EU authorities, WPDPs provide competence development activities to SMEs in order to boost their production capabilities and/or promote innovation. The findings reveal that the competence development activities provided by the programme triggered learning in everyday work activities and fostered the development of different approaches to employee-driven innovation in the enterprises. The conclusion is that it is essential to consider that employee-driven innovations may take different forms and involve functions that can support innovative learning that goes beyond minor adjustments to the existing standards of production. Moreover, employee-driven innovation may impose new demands on management leadership skills. The findings provide important guidance for future WPDPs, for vocational education and training or university activities that are customised to SME contexts to promote production capabilities, and for SMEs that aim to strengthen employee-driven innovation.

    sted, utgiver, år, opplag, sider
    Dordrecht: Springer Netherlands, 2018
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-137495 (URN)10.1007/s12186-017-9179-6 (DOI)000426597000003 ()
    Forskningsfinansiär
    VINNOVA, 2013-02430
    Merknad

    Funding agencies: Swedish Agency for Innovation Systems (VINNOVA) [Vinnova 2013-02430]

    Tilgjengelig fra: 2017-05-18 Laget: 2017-05-18 Sist oppdatert: 2019-02-13bibliografisk kontrollert
  • Disputas: 2019-03-07 13:00 Hugo Theorell, Linköping
    Hadimeri, Ursula
    Linköpings universitet, Institutionen för medicin och hälsa. Linköpings universitet, Medicinska fakulteten.
    Factors affecting the physical characteristics of arterio-venous fistula in patients with renal failure2019Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Background and Purpose

    A patent access is vital for a dialysis patient. The arterio-venous fistula (AVF), the most important access for haemodialysis (HD), is frequently affected by extensive complications such as stenosis and occlusions.

    Study I: To investigate whether the dimensions of AVFs used for performing haemodialysis were affected by the original disease.

    Study II: To investigate if the diameter of the distal radiocephalic fistula could influence left ventricular variables in stable haemodialysis patients.

    Study III: To investigate whether a single Far Infrared (FIR) light treatment could alter blood velocity, AVF diameter or inflammatory markers.

    Study IV: To evaluate in what extent the renal diagnosis and radiological interventions affected the dysfunction of AVF and results of percutaneous transluminal angioplasty (PTA).

    Materials and methods

    Study I: The lumen diameter of the AVF was studied by ultrasound in 19 patients with autosomal dominant polycystic kidney disease (ADPKD) and in 19 control patients. The monitoring was performed along the forearm part of the vein, the maximal diameter was measured. The diameters of the two needle insertion sites were also measured.

    Study II: Nineteen patients were investigated with echocardiography, using M-mode recordings and measurements in the 2D image. Ultrasound and doppler ultrasound were performed. Transsonic measurements were performed after the ultrasound investigation. Measurements of the diameter of the AVF were performed in four locations. Heart variables were analysed regarding left ventricular (LV) criteria.

    Study III: Thirty patients with native AVF in the forearm were included. Each patient was his/her own control. Ultrasound examinations of the AVF diameter and blood flow velocity were performed before and after a single Far Infrared light (FIR) treatment.

    Study IV: 522 radiological investigations and endovascular treatments between January 1, 2006 and December 31, 2014 were analysed in 174 patients, retrospectively. All investigations had been performed due to clinical suspicion of impaired AVF function. All stenoses were evaluated and the number, degree, length, location and relation to anastomosis were recorded. After PTA the remaining stenoses were evaluated again and complications were recorded.

    Results

    Study I: The diameter of the AVF at the maximal site in patients with ADPKD was significantly wider than that for the control patients.

    Study II: A larger AVF mean and maximal diameter worsened left ventricular characteristics.

    Study III: A single FIR treatment resulted in a significant increase in blood velocity over the AV fistula from a mean of 2.1±1.0 m/s to 2.3±1.0 m/s. The diameter of the arterialized vein became wider, i.e. 0.72±0.02 to 0.80±0.02 cm. The increase in fistula blood velocity correlated positively with baseline serum-urate and the increase in venous diameter correlated positively with the baseline plasma orosomucoid concentration.

    Study IV: The degree of AVF stenosis before PTA correlated significantly with the degree of remaining stenosis after intervention. Arterial stenosis was significantly more frequent among patients with diabetic nephropathy and interstitial nephritis. A shorter life span between PTAs was related to diabetic nephropathy.

    Conclusions

    Study I: The receiving veins of AVF in patients with ADPKD have an abnormality that causes a greater than normal dilatation in response to the arterialization.

    Study II: The maximal diameter of the distal AVF seems to be a sensitive marker of LV impairment in stable haemodialysis patients.

    Study III: A single FIR treatment increased AVF blood velocity and vein diameter. Thus, one FIR treatment can help maturation of AVF in the early postoperative course.

    Study IV: Repeated PTA was performed significantly more often in patients with diabetic nephropathy. Clinically significant stenosis should be dilated as soon as possible. Occlusion of the AVF should be thrombolyzed and/or dilated when diagnosed.

    Delarbeid
    1. Dimensions of Arteriovenous Fistulas in Patients with Autosomal Dominant Polycystic Kidney Disease
    Åpne denne publikasjonen i ny fane eller vindu >>Dimensions of Arteriovenous Fistulas in Patients with Autosomal Dominant Polycystic Kidney Disease
    2000 (engelsk)Inngår i: Nephron. Clinical practice, ISSN 1660-8151, E-ISSN 2235-3186, Vol. 85, nr 1, s. 50-53Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Background/Aim: Aneurysms are known manifestations of autosomal dominant polycystic kidney disease (ADPKD). We investigated whether the dimensions of arteriovenous fistulas created for performance of haemodialysis were affected by the original disease.

    Methods: The lumen diameter of the fistula was studied by ultrasound in 19 patients with ADPKD and in 19 control patients. The patients’ sex, age, the duration of their fistulas, haemoglobin values and blood pressure levels were similar in both groups. The monitoring was performed along the forearm part of the vein, and the maximal diameter was measured. The diameters at the two needle insertion sites were also measured.

    Results: The ADPKD patients had a significantly higher fistula diameter than the control patients: 12 (range 8–19) mm versus 8 (range 6–24) mm at the widest level (p = 0.003). There were no significant differences in the diameters at the needle insertion sites.

    Conclusion: The receiving veins of arteriovenous fistulas in patients with ADPKD have an abnormality that causes a greater than normal dilatation in response to the arterialization. We postulate that this phenomenon is linked with the increased prevalence of aneurysms in ADPKD.

    sted, utgiver, år, opplag, sider
    Basel: S. Karger, 2000
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-154621 (URN)10.1159/000045629 (DOI)
    Tilgjengelig fra: 2019-02-22 Laget: 2019-02-22 Sist oppdatert: 2019-02-22bibliografisk kontrollert
    2. Fistula diameter correlates with echocardiographic characteristics in stable hemodialysis patients
    Åpne denne publikasjonen i ny fane eller vindu >>Fistula diameter correlates with echocardiographic characteristics in stable hemodialysis patients
    Vise andre…
    2015 (engelsk)Inngår i: Nephrology @ Point of Care, ISSN 2059-3007, Vol. 1, nr 1, s. e44-e48Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Left ventricular hypertrophy (LVH) is a common finding in hemodialysis patients. The aim of the present study was to investigate if the diameter of the distal radiocephalic fistula could influence left ventricular variables in stable hemodialysis patients.

    Methods

    Nineteen patients were investigated. Measurements of the diameter of the arteriovenous (AV) fistula were performed in 4 different locations. The patients were investigated using M-mode recordings and measurements in the 2D image. Doppler ultrasound was also performed. Transonic measurements were performed after ultrasound investigation.

    Results

    Fistula mean and maximal diameter correlated with left ventricular characteristics. Fistula flow correlated neither with the left ventricular characteristics nor with fistula diameters.

    Conclusions

    The maximal diameter of the distal AV fistula seems to be a sensitive marker of LVH in stable hemodialysis patients.

    sted, utgiver, år, opplag, sider
    Wichtig Publishing, 2015
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-130611 (URN)
    Merknad

    DOI does not work: 10.5301/pocj.5000193

    Tilgjengelig fra: 2016-08-18 Laget: 2016-08-18 Sist oppdatert: 2019-02-22
    3. A single treatment, using Far Infrared light improves blood flow conditions in arteriovenous fistula
    Åpne denne publikasjonen i ny fane eller vindu >>A single treatment, using Far Infrared light improves blood flow conditions in arteriovenous fistula
    2017 (engelsk)Inngår i: Clinical hemorheology and microcirculation, ISSN 1386-0291, E-ISSN 1875-8622, Vol. 66, nr 3, s. 211-217Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    BACKGROUND: A native arteriovenous fistula (AVF) is recommended for angio access in patients on chronic hemodialysis (HD). Fistula patency has been improved by exposure to Far Infrared light (FIR). OBJECTIVE: To investigate whether a single FIR treatment could alter blood velocity, AVF diameter or inflammatory markers. METHODS: Thirty patients with a native AVF in the forearm were included. Each patient was his/her own control. Ultrasound (US) examinations were performed before and after a single FIR treatment. RESULTS: A single FIR treatment resulted in a significant increase in blood velocity over the AV fistula from a mean of 2.1 +/- 1.0 m/s to 2.3 +/- 1.0 m/s (p = 0.02). The diameter of the arterialized vein became wider; 0,72 cm +/- 0.02 to 0,80 cm +/- 0.02, (p = 0.006). The increase in fistula blood velocity correlated positively with base line serum-urate p = 0.004) and the increase in venous diameter with the base line plasma orosomucoid concentration (p = 0.005). CONCLUSIONS: This study shows that a single FIR treatment significantly increased AVF blood velocity and vein diameter. Thus, one FIR treatment can help maturation of AVF in the early postoperative course.

    sted, utgiver, år, opplag, sider
    IOS PRESS, 2017
    Emneord
    Ultrasound; vascular access; Far Infrared therapy; hemodialysis
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-139673 (URN)10.3233/CH-170254 (DOI)000404475300004 ()28527196 (PubMedID)
    Tilgjengelig fra: 2017-08-16 Laget: 2017-08-16 Sist oppdatert: 2019-02-22