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| 2. |
- Abbak, Ramazan A., et al.
(författare)
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A precise gravimetric geoid model in a mountainous area with scarce gravity data : a case study in central Turkey
- 2012
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Ingår i: Studia Geophysica et Geodaetica. - : Springer Science and Business Media LLC. - 0039-3169 .- 1573-1626. ; 56:4, s. 909-927
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Tidskriftsartikel (refereegranskat)abstract
- In mountainous regions with scarce gravity data, gravimetric geoid determination is a difficult task that needs special attention to obtain reliable results satisfying the demands, e.g., of engineering applications. The present study investigates a procedure for combining a suitable global geopotential model and available terrestrial data in order to obtain a precise regional geoid model for Konya Closed Basin (KCB). The KCB is located in the central part of Turkey, where a very limited amount of terrestrial gravity data is available. Various data sources, such as the Turkish digital elevation model with 3 '' x 3 '' resolution, a recently published satellite-only global geopotential model from the Gravity Recovery and Climate Experiment satellite (GRACE) and the ground gravity observations, are combined in the least-squares sense by the modified Stokes' formula. The new gravimetric geoid model is compared with Global Positioning System (GPS)/levelling at the control points, resulting in the Root Mean Square Error (RMS) differences of +/- 6.4 cm and 1.7 ppm in the absolute and relative senses, respectively. This regional geoid model appears to he more accurate than the Earth Gravitational Model 2008, which is the best global model over the target area, with the RMS differences of +/- 8.6 cm and 1.8 ppm in the absolute and relative senses, respectively. These results show that the accuracy of a regional gravimetric model can be augmented by the combination of a global geopotential model and local terrestrial data in mountainous areas even though the quality and resolution of the primary terrestrial data are not satisfactory to the geoid modelling procedure.
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| 3. |
- Murphy, Kathleen, 1972, et al.
(författare)
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Fluorescence spectroscopy and multi-way techniques. PARAFAC
- 2013
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Ingår i: Analytical Methods. - : Royal Society of Chemistry (RSC). - 1759-9679 .- 1759-9660. ; 5:23, s. 6557-6566
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Tidskriftsartikel (refereegranskat)abstract
- PARAllel FACtor analysis (PARAFAC) is increasingly used to decompose fluorescence excitation emission matrices (EEMs) into their underlying chemical components. In the ideal case where fluorescence conforms to Beers Law, this process can lead to the mathematical identification and quantification of independently varying fluorophores. However, many practical and analytical hurdles stand between EEM datasets and their chemical interpretation. This article provides a tutorial in the practical application of PARAFAC to fluorescence datasets, demonstrated using a dissolved organic matter (DOM) fluorescence dataset. A new toolbox for MATLAB is presented to support improved visualisation and sensitivity analyses of PARAFAC models in fluorescence spectroscopy. © 2013 The Royal Society of Chemistry.
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| 4. |
- Loyd, Dan, et al.
(författare)
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Pressure half-time does not always predict mitral valve area correctly.
- 1988
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Ingår i: Journal of the American Society of Echocardiography. - 0894-7317 .- 1097-6795. ; 1:5, s. 313-321
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Tidskriftsartikel (refereegranskat)abstract
- A theory is presented elucidating factors that influence the pressure half-time. By combining the Bernoulli and continuity equations and making certain assumptions about the shape of the atrioventricular pressure difference decay, it can be shown that valve area, volume transported across that area, and initial pressure difference influence the pressure half-time according to a formula in which the pressure half-time is related to V/(Ao square root of delta po), where V is the transported volume across the orifice with the area Ao, and delta po is the initial pressure difference across that area. In a subsequent hydraulic model experiment pressure half-time was determined for three different hole areas, with various initial volumes and initial pressure gradients. We did not obtain a unique relation between the pressure half-time and area. Instead the results supported our theory, and we found a close linear relationship between area and V/(T0.5 square root of delta po) (correlation coefficient [r] = 0.998), as predicted in the theory (T0.5 = pressure half-time). Clinical examples in which the pressure half-time may be misleading in the assessment of severity of mitral stenosis are presented.
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| 6. |
- Desforges, F. G., et al.
(författare)
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Dynamics of ionization-induced electron injection in the high density regime of laser wakefield acceleration
- 2014
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Ingår i: Physics of Plasmas. - : AIP Publishing. - 1070-664X .- 1089-7674. ; 21:12
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Tidskriftsartikel (refereegranskat)abstract
- The dynamics of ionization-induced electron injection in high density (similar to 1.2 x 10(19) cm(-3)) regime of laser wakefield acceleration is investigated by analyzing the betatron X-ray emission. In such high density operation, the laser normalized vector potential exceeds the injection-thresholds of both ionization-injection and self-injection due to self-focusing. In this regime, direct experimental evidence of early on-set of ionization-induced injection into the plasma wave is given by mapping the X-ray emission zone inside the plasma. Particle-In-Cell simulations show that this early on-set of ionization-induced injection, due to its lower trapping threshold, suppresses the trapping of self-injected electrons. A comparative study of the electron and X-ray properties is performed for both self-injection and ionization-induced injection. An increase of X-ray fluence by at least a factor of two is observed in the case of ionization-induced injection due to increased trapped charge compared to self-injection mechanism. (C) 2014 AIP Publishing LLC.
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| 7. |
- Gardner, A., et al.
(författare)
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Optimal stomatal theory predicts CO2 responses of stomatal conductance in both gymnosperm and angiosperm trees
- 2022
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Ingår i: New Phytologist. - : Wiley. - 0028-646X .- 1469-8137. ; 237:4, s. 1229-41
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Tidskriftsartikel (refereegranskat)abstract
- Optimal stomatal theory predicts that stomata operate to maximise photosynthesis (A(net)) and minimise transpirational water loss to achieve optimal intrinsic water-use efficiency (iWUE). We tested whether this theory can predict stomatal responses to elevated atmospheric CO2 (eCO(2)), and whether it can capture differences in responsiveness among woody plant functional types (PFTs). We conducted a meta-analysis of tree studies of the effect of eCO(2) on iWUE and its components A(net) and stomatal conductance (g(s)). We compared three PFTs, using the unified stomatal optimisation (USO) model to account for confounding effects of leaf-air vapour pressure difference (D). We expected smaller g(s), but greater A(net), responses to eCO(2) in gymnosperms compared with angiosperm PFTs. We found that iWUE increased in proportion to increasing eCO(2) in all PFTs, and that increases in A(net) had stronger effects than reductions in g(s). The USO model correctly captured stomatal behaviour with eCO(2) across most datasets. The chief difference among PFTs was a lower stomatal slope parameter (g(1)) for the gymnosperm, compared with angiosperm, species. Land surface models can use the USO model to describe stomatal behaviour under changing atmospheric CO2 conditions.
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| 8. |
- James, Inger, 1953-, et al.
(författare)
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Nurse assistants' experiences and knowledge of how they create a meaningful daily life for older persons receiving municipal home healthcare
- 2024
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Ingår i: Scandinavian Journal of Caring Sciences. - : John Wiley & Sons. - 0283-9318 .- 1471-6712. ; 38:1, s. 159-168
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Tidskriftsartikel (refereegranskat)abstract
- Aims and Objectives: To explore nurse assistants' experiences and knowledge of how they create a meaningful daily life for older people receiving municipal home healthcare.Design: A participatory appreciative action reflection approach.Methods: Interviews, participant observations and informal conversations with 23 nurse assistants in municipal home healthcare generated the data. A thematic analysis was used.Results: Two main themes were developed. The first main theme, building a reciprocal relationship, was structured by three subthemes: To strengthen the older person's self-esteem, to co-create care and to create equality. The second main theme, creating meaning, was structured by two subthemes: To create closeness and to receive appreciation. The two main themes are each other's prerequisite. Nursing assistants' building reciprocal relationships gives meaning; through the meaning, reciprocal relationships are achieved, and by that, meaningful daily lives for both the older people and the nurse assistants.Conclusion: Nurse assistants built a reciprocal relationship both for the older people and for the nurse assistant. This contributes to create a meaningful daily life for the older people. The older person was the main character, and it seems that the nurse assistants apply person-centred care, which can represent a shared common vision that can be used in the encounter.
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| 9. |
- James, Inger, 1953-, et al.
(författare)
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The encounter between informal and professional care at the end of life
- 2009
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Ingår i: Qualitative Health Research. - London : SAGE. - 1049-7323 .- 1552-7557. ; 19:2, s. 258-271
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Tidskriftsartikel (refereegranskat)abstract
- The purpose of this study was to obtain and describe in-depth knowledge about family carers' experiences of the encounter, in a hospital, between informal and professional care at the end of life. A hermeneutic approach was chosen, and we conducted interviews with 27 family carers 6 to 8 months after their loved one's death. In the encounter, the family carers made their own assessment of their loved one's condition and situation. The professionals' attitudes could both promote and impede the interaction between the two forms of care. Family carers' care actions were characterized by struggling to get treatment, being left behind, being partners, keeping the illness at a distance, hovering beside their loved one, waiting for death, and being experts and protectors. The main interpretation of the findings is that family carers possess practical knowledge about what care is the best, or least harmful, for their loved one. This can be linked to what Aristotle called phronesis.
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| 10. |
- Kinoshita, Mari, et al.
(författare)
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Opioids for procedural pain in neonates
- 2021
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Ingår i: Cochrane Database of Systematic Reviews. - : John Wiley & Sons. - 1469-493X .- 1465-1858. ; :12
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Tidskriftsartikel (refereegranskat)abstract
- ObjectivesThis is a protocol for a Cochrane Review (intervention). The objectives are as follows:To determine the effects of opioid analgesics in term or preterm neonates exposed to procedural pain, compared to placebo or no drug, non-pharmacological intervention, other analgesics or sedatives, other opioids, or the same opioid administered by a different route.
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