| 1. |
- Adell, Johan, 1980, et al.
(author)
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Thermal diffusion of Mn through GaAs overlayers on (Ga, Mn)As
- 2011
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In: Journal of Physics. - : Institute of Physics Publishing (IOPP). - 0953-8984 .- 1361-648X. ; 23:8
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Journal article (peer-reviewed)abstract
- Thermally stimulated diffusion of Mn through thin layers of GaAs has been studied by x-ray photoemission. (Ga, Mn)As samples with 5 at% Mn were capped with 4, 6 and 8 monolayer (ML) GaAs, and Mn diffusing through the GaAs was trapped on the surface by means of amorphous As. It was found that the out-diffusion is completely suppressed for an 8 ML thick GaAs film. The short diffusion length is attributed to an electrostatic barrier formed at the (Ga, Mn)As/GaAs interface.
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| 2. |
- Agic, Adnan, 1967-, et al.
(author)
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Dynamic effects on cutting forces with highly positive versus highly negative cutting edge geometries
- 2019
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In: International Journal on Interactive Design and Manufacturing. - : Springer Science and Business Media LLC. - 1955-2513 .- 1955-2505. ; 13:2, s. 557-565
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Journal article (peer-reviewed)abstract
- Understanding the influence of the cutting edge geometry on the development of cutting forces during the milling process is of high importance in order to predict the mechanical loads on the cutting edge as well as the dynamic behavior on the milling tool. The work conducted in this study involves the force development over the entire engagement of a flute in milling, from peak force during the entry phase until the exit phase. The results show a significant difference in the behavior of the cutting process for a highly positive versus a highly negative cutting edge geometry. The negative edge geometry gives rise to larger force magnitudes and very similar developments of the tangential and radial cutting force. The positive cutting edge geometry produces considerably different developments of the tangential and radial cutting force. In case of positive cutting edge geometry, the radial cutting force increases while the uncut chip thickness decreases directly after the entry phase; reaching the peak value after a certain delay. The radial force fluctuation is significantly higher for the positive cutting edge geometry. The understanding of such behavior is important for modelling of the milling process, the design of the cutting edge and the interactive design of digital applications for the selection of the cutting parameters.
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| 3. |
- Agic, Adnan, 1967-, et al.
(author)
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Experimental analysis of cutting edge effects on vibrations in end milling
- 2019
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In: CIRP - Journal of Manufacturing Science and Technology. - : Elsevier BV. - 1755-5817 .- 1878-0016. ; 24, s. 66-74
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Journal article (peer-reviewed)abstract
- The ability to minimize vibrations in milling by the selection of cutting edge geometry and appropriate cutting conditions is an important asset in the optimization of the cutting process. This paper presents a measurement method and a signal processing technique to characterize and quantify the magnitude of the vibrations in an end milling application. Developed methods are then used to investigate the effects of various cutting edge geometries on vibrations in end milling. The experiments are carried out with five cutting edge geometries that are frequently used in machining industry for a wide range of milling applications. The results show that a modest protection chamfer combined with a relatively high rake angle has, for the most of cutting conditions, a reducing effect on vibration magnitudes. Furthermore, dynamics of a highly positive versus a highly negative cutting geometry is explored in time domain and its dependency on cutting conditions is presented. The results give concrete indications about the most optimal cutting edge geometry and cutting conditions in terms of dynamic behavior of the tool.
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| 4. |
- Agic, Adnan, 1967-, et al.
(author)
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Influence of cutting edge geometry on force build-up process in intermittent turning
- 2016
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In: Procedia CIRP. - : Elsevier BV. - 2212-8271 .- 2212-8271. ; 46, s. 364-367
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Journal article (peer-reviewed)abstract
- In the intermittent turning and milling processes, during the entry phase the cutting edges are subjected to high impact loads that can give rise to dynamical and strength issues which in general cause tool life reduction. In this study the effect of geometrical features of the cutting tool on the force generation during the entry phase is investigated. Cutting forces are measured by a stiff dynamometer at a high sampling frequency. In addition, the chip load area is analyzed and related to the measured cutting force. The results show that micro-geometrical features, in particular the protection chamfer, significantly affect the force generation during the entry phase.
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| 5. |
- Agic, Adnan, 1967-, et al.
(author)
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Influence of radial depth of cut on entry conditions and dynamics in face milling application
- 2017
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In: Journal of Superhard Materials. - New York : Allerton Press. - 1063-4576 .- 1934-9408. ; 39:4, s. 259-270
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Journal article (peer-reviewed)abstract
- The choice of milling cutter geometry and appropriate cutting data for certain milling application is of vital importance for successful machining results. Unfavorable selection of cutting conditions might give rise to high load impacts that cause severe cutting edge damage. Under some circumstances the radial depth of cut in combination with milling cutter geometry might give unfavorable entry conditions in terms of cutting forces and vibration amplitudes. This phenomenon is originated from the geometrical features that affect the rise time of the cutting edge engagement into workpiece at different radial depths of cut. As the radial depth of cut is often an important parameter, particularly when machining difficult-to-cut materials, it is important to explore the driving mechanism behind vibrations generation. In this study, acceleration of the workpiece is measured for different radial depths of cut and cutting edge geometries. The influence of the radial depth of cut on the dynamical behavior is evaluated in time and frequency domains. The results for different radial depths of cut and cutting geometries are quantified using the root mean square value of acceleration. The outcome of this research study can be used both for the better cutting data recommendations and improved tool design.
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| 6. |
- Ahmadi, Nasser, 1958, et al.
(author)
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Clinical characteristics of asymptomatic left ventricular diastolic dysfunction and its association with self-rated health and N-terminal B-type natriuretic peptide: a cross-sectional study
- 2016
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In: Esc Heart Failure. - : Wiley. - 2055-5822. ; 3:3, s. 205-211
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Journal article (peer-reviewed)abstract
- Aims Left ventricular hypertrophy, obesity, hypertension, and N-terminal B-type natriuretic peptide (Nt-proBNP) predict left ventricular diastolic dysfunction with preserved systolic function (DD-PSF). Self-rated health (SRH) is shown to be associated with chronic diseases, but the association of SRH with DD-PSF is unclear. In light of the clinical implications of DD-PSF, the following goals are of considerable importance: (1) to determine the role of SRH in patients with DD-PSF in the general population and (2) to study the association between Nt-proBNP and DD-PSF. Methods and results The current study is a cross-sectional study conducted on a random sampling of a rural population. Individuals 30-75 years of age were consecutively subjected to conventional echocardiography and tissue velocity imaging. Data were collected on 500 (48%) men and 538 (52%) women (n = 1038). DD-PSF was the main outcome, and SRH and Nt-proBNP were the primary indicators. Diabetes mellitus, hypertension, and obesity were accounted for as major confounders of the association with SRH. DD-PSF was identified in 137 individuals, namely, 79 men (15.8%) and 58 women (10.8%). In a multivariate regression model, SRH (OR 2.95; 95% CI 1.02-8.57) and Nt-proBNP (quartile 4 vs. quartile 1 OR 4.23; 95% CI 1.74-10.26) were both independently associated with DD-PSF. Conclusions SRH, evaluated based on a descriptive question on general health, should be included in the diagnostic process of DD-PSF. In agreement with previous studies, our study confirms that Nt-proBNP is a major indicator of DD-PSF.
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| 7. |
- Alvehus, Johan, et al.
(author)
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A New Professional Landscape : Entangled Institutional Logics in Two Swedish Welfare Professions
- 2018
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In: Nordic Journal of Working Life Studies. - : Nordic Journal of Working Life Studies. - 2245-0157. ; 8:3, s. 91-109
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Journal article (peer-reviewed)abstract
- Previous research has made three parallel but incompatible observations on the contemporary development of welfare professions: loss of professional autonomy, hybridization, and maintained autonomy. Yet, research providing contextual understanding of the simultaneous occurrence of these three observations is lacking. The aim of this theoretical paper is to identify and explain seemingly contradictory coexisting features of modern welfare professions through a compre-hensive reading of current literature on the health care and teaching professions in Sweden. The literature has demonstrated entangled institutional logics, in which simultaneous but differing effects occur, thereby developing a new professional landscape.
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| 8. |
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| 9. |
- Anderberg, Peter, et al.
(author)
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Being there
- 2005
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In: Disability & Society. - : Informa UK Limited. - 0968-7599 .- 1360-0508. ; 20:7, s. 719-733
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Journal article (peer-reviewed)abstract
- This paper examines the use of the Internet as experienced by people with significant mobility/physicalimpairments who are accustomed to using computers. The study is based on interviews andfocuses on computer usage in everyday action and interaction. In many cases, the possibilities thatthe computer and Internet offer have meant not only important improvements in quality of life, butfirst-time occurrences of great personal significance. The analysis is phenomenographic, resultingin main categories and subcategories, illustrated primarily through direct quotations. The threemain categories are independence, communication, and learning.
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| 10. |
- Anderberg, Peter, et al.
(author)
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Enabling design
- 2009
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In: Ergonomics for Rehabilitation Professionals. - Boca Raton : CRC Press. - 9780849381461 ; , s. 477-506
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Book chapter (peer-reviewed)abstract
- Designed to meet the diverse needs of therapists, this book presents a new approach to rehabilitation that integrates ergonomics concepts to address the wide range of problems commonly encountered by professionals. The first section addresses general concepts such as anthropometry and tissue mechanics. The next section explores whole body biomechanics, demonstrating the ergonomic effects of physiological and biomechanical factors. The third section focuses on regional biomechanics, explaining the rationale for ergonomic intervention. The final section of the text offers with a detailed discussion of the ergonomic paradigm in rehabilitation, including the use of physical demands analysis.
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