| 1. |
- Abenius, Johan, et al.
(författare)
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Gaddsteklar och andra insekter i halländska sanddynsreservat
- 2004
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Gaddsteklar och vissa andra insekter har inventerats inom sex sanddynsreservat utmed Hallandskusten. Totalt insamlades och artbestämdes 1 418 insekter fördelade på 236 arter, varav 103 arter gaddsteklar. Tio rödlistade arter påträffades och tretton arter har tidigare inte noterats i Halland. Inventeringen ger en översiktlig bild av gaddstekelfaunan i dynreservaten och det finns med all säkerhet betydligt fler rödlistade och andra intressanta arter kvar att upptäcka. Många gaddsteklar och andra insekter knutna till öppna, solexponerade sandmarker hade en guldålder under det gamla bondesamhällets tid före 1800 talets agrara revolution. Numera finns bara några få procent av kusttrakternas öppna sandmarker kvar och de blomsterrika slåtterängarna och ljunghedarna som omgav flygsandfälten har i det närmaste utplånats på stora delar av den halländska kustslätten. Mot den bakgrunden är det lätt att förstå att många växter och djur, bland annat gaddsteklar, knutna till öppna, blomsterrika sandmarker idag är utrotningshotade. Huvudsyftet med inventeringen är att vara ett underlag för den framtida skötseln av dynreservaten. Resultaten visar tydligt att en mer aktiv skötsel är angelägen med kontinuerlig markstörning som skapar sandblottor och hävd genom röjning, bete, slåtter och/eller bränning. Dessutom behövs omfattande restaureringsåtgärder för att återskapa öppna sandmiljöer. Stora arealer täta och närmast ogenomträngliga bergtallskogar inom kustreservaten bör omföras till mer öppna sandmarker till förmån för biologisk mångfald och friluftsliv.
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| 2. |
- Andersson, Patrik, 1974, et al.
(författare)
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A Method for Experimental Collection of Global Material Data for Tyres
- 2001
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Ingår i: Nordic Vibration Research 2001, Stockholm, Sweden (The Scandianvian Vibration Society, www.svib.se).
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- For the modelling of the dynamic behaviour of tyres material data are required. Depending on the character of the model these will have different quality. Modelling with global structures such as beams or plates, representative data for the global bending stiffness, global mass etc. are needed. These data do not represent the details of the tyre structure but the combined properties of the structure. Therefore it is not possible to cut out samples of the tyre and determine the global material properties by measurements on these samples. Consequently it is necessary to estimate the material parameter by measurements carried out on the complete tyre. Results from such measurements will be related to the model used for the tyre (e.g. ring model, orthotropic plate, etc.). The material data obtained in such way are consequently a function of both the tyre structure and the model, which is used to update the data. A method for experimental collection of global material data for tyres has been developed. This method is based on the experimental characterisation of tyres by driving point and transfer mobilities and the use of the orthotropic plate tyre model for updating the material data.
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| 3. |
- Andersson, Patrik, 1974, et al.
(författare)
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Experimental Study of High Frequency Response of Tyres
- 2003
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Ingår i: EuroNoise2003, May 19-21 2003, Naples, Italy.
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Konferensbidrag (refereegranskat)abstract
- Most traditional tyre models concern the low and middle frequency ranges. It is necessary to include higher frequencies for improved accuracy in tyre/road interaction models. Often only the radial direction is included, although the tangential direction may be important, especially studying stick slip motion in the contact between tyre and road surface. Designing models requires insight into the behaviour of the tyre structure at higher frequencies. To add insight of high frequency behaviour, experimental studies were done on four different tyres with the same internal design but with different tread patterns. The results of this study underline the importance of the local deformation when forces act with small excitation areas on the tread. Adequate consideration of the tread properties in the tyre/road interaction models is thus of importance to obtain the correct local contact force distribution. This is most important for the tangential driving point mobility. Tread patterns are shown mainly to modify the flexural stiffness and mass in comparison to smooth tyres, while block resonances are not expected to be located in the frequency range in which tyre/road noise is important.
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| 4. |
- Andersson, Patrik, 1974, et al.
(författare)
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High Frequency Dynamic Behaviour of Smooth and Patterned Passenger Car Tyres
- 2004
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Ingår i: Acta Acustica united with Acustica. - 1610-1928 .- 1861-9959. ; 90:3, s. 445-456
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Tidskriftsartikel (refereegranskat)abstract
- Most traditional tyre models concern the low and middle frequency ranges. For improved accuracy in tyre/roadinteraction models it is necessary to include higher frequencies. Often only the radial direction is included, althoughthe tangential direction may be important, especially studying stick slip motion in the contact between tyreand road surface. Designing accurate and efifcient models requires insight into the behaviour of the tyre structureat higher frequencies to make the models as complete as necessary without creating tools that are computationallytoo costly. To add insight to this area, experimental studies were done on four different tyres with the sameinternal design but with different tread patterns. Point mobilities were measured and compared with two differenttyre models, a two-layer plate model based on the elastic field equations and an orthotropic plate model. Theresults of this study underline the importance of the local deformation when there are forces that act with smallexcitation areas on the tread. Adequate consideration of the tread properties in the tyre/road interaction modelsis thus of extreme importance to obtain the correct local contact force distribution. This is most important for thetangential driving point mobility. Tread patterns are shown mainly to modify the flexural stiffness in comparisonto smooth tyres, while block resonances are not expected to be located in the frequency range in which tyre/roadnoise is important.
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| 5. |
- Andersson, Patrik, 1974, et al.
(författare)
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Investigation of Driving Point and Transfer Mobilities of Simple Tread Blocks on a Tyre
- 2001
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Ingår i: 17th International Congress on Acoustics, Rome, Italy, 2001.
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Konferensbidrag (refereegranskat)abstract
- An important issue when modeling noise generation from rolling tyres using the orthotropic plate tyre model [1] is to find accurate Green’s functions for the responses of the tyre. These Green’s functions are used to solve the tyre/road contact problem of the rolling tyre in the time domain. For tyres with tread blocks, it is important to consider the influence of the tread blocks on the response. It has previous been suggested that the tread blocks could be modeled as mass-spring systems [2]. Measurements of mobilies on a tyre with simple and regular tread blocks shows that this approach is unnecessary when modelling the response in radial direction of the tyre in the frequency range between 0 and 2500 Hz. Instead the tyre may be modeled, using a plate tyre model, as a soft plate with slightly higher local deformation. The tread pattern may be modeled in the tyre/road contact model as a macro roughness, where points at the blocks may be in contact with the road while forces at points in the groves are set to zero.
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| 6. |
- Andersson, Patrik, 1974, et al.
(författare)
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Validation of a High Frequency Tyre Model Based on the Elastic Field Equations
- 2003
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Ingår i: Conference proceedings of the 10th Interational Congress on Sound and Vibration, July 7-10 2003, Stockholm, Sweden.
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Konferensbidrag (refereegranskat)abstract
- A three-dimensional two-layer plate tyre model based on the elastic field equations has been presented previously by one of the authors. This model makes it possible to calculate the response caused by a force in both the radial and tangential directions at high frequencies, including the local deformation at the excitation point. Now results from this tyre model have been compared with measured data from a real tyre. The effect of the measurement equipment has been included in the model and the model is demonstrated and validated against measured radial and tangential point and transfer mobilities. The agreement is good for radial point mobilities, capturing the local behaviour. The radial transfer mobility also agrees well with measured data. A demonstration of the tangential point and transfer mobility is done changing the boundary conditions along the sides of the plate from simply supported to one allowing both translations and rotations. The results show the possibility of good agreement in characteristics and levels.
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| 7. |
- Ihse, Ingemar, et al.
(författare)
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Riktlinjer för handläggning av patienter med pankreascancer
- 2002
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Ingår i: Läkartidningen. - 0023-7205. ; 99:15, s. 1676-1683
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Tidskriftsartikel (refereegranskat)abstract
- The incidence of pancreatic cancer has fallen during the last ten years in Sweden. Early signs and symptoms of the disease are still undiscovered and when diagnosis is made the disease is incurable in most patients. Transabdominal ultrasonography is the first-line imaging test followed by spiral computed tomography (CT) and magnetic resonance imaging (MRI) if required for definite diagnosis. Spiral CT is also the imaging test of choice for assessment of resectability of the tumor. Surgical removal of the tumor is the only chance of cure. Markedly improved hospital mortality after pancreaticoduodenectomy is reported and an association between hospital volume and outcome of the operation has been established. Longterm survival after attempted curative resection continues to be dismal, however. Adjuvant treatment should not be given outside clinical studies. Palliative treatment has improved thanks to progress in the field of endoscopy, interventional radiology and in management of pain and nutrition. Palliative chemotherapy should only be given selectively outside clinical studies. Radiotherapy has no proven effects on survival. Special pancreatic cancer treatment teams with catchment areas of 2-4 million inhabitants are recommended by international authorities.
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| 8. |
- Ihse, Ingemar, et al.
(författare)
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Riktlinjer för handläggning av patienter med pankreascancer [Guidelines for management of patients with pancreatic cancer]
- 2002
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Ingår i: Läkartidningen. - 0023-7205 .- 1652-7518. ; 99:15, s. 1676-1685
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Transabdominellt ultraljud är förstahandsundersökning vid misstänkt pankreascancer, följt av spiral-DT eller MR för mer definitiv diagnos. Tumörmarkörer har ingen plats i rutindiagnostiken. Spiral-DT är basen i resektabilitetsbedömningen. Resektion av tumören är en förutsättning för bot. Ett samband har påvisats mellan antalet resektioner som görs vid ett sjukhus årligen och postoperativ mortalitet. Långtidsöverlevnaden efter resektion är oförändrat kort medan postoperativ mortalitet minskat dramatiskt vid enheter som rapporterat sina resultat. Adjuvant behandling efter resektion bör endast ges inom ramen för kliniska studier. Det palliativa omhändertagandet har förbättrats främst genom utveckling inom endoskopi, interventionell radiologi, smärt- och nutritionsbehandling. Palliativ cytostatikabehandling bör endast ges selektivt utanför kliniska studier. Radioterapi har ingen dokumenterad effekt på överlevnaden vid icke-resektabel pankreascancer. Internationellt rekommenderas speciella behandlingsteam för pankreascancer med tillräckliga upptagningsområden (2–4 miljoner invånare).
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| 9. |
- Kropp, Wolfgang, 1959, et al.
(författare)
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Simulation of the Tyre/Road Noise
- 2001
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Ingår i: Styrian Noise, Vibration & Harshness Congress 2001, Acoustic Competence Center, Graz, Austria.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 10. |
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