Som en följd av Sveriges medlemskap i EU har offentliga upphandlingar kommit att få allt större betydelse eftersom de nu kan ske inom ett betydligt större geografiskt område än tidigare. En konsekvens av detta är att konkurrensen blivit allt hårdare och nya regler införs i takt med den snabba utvecklingen. Ett av resultaten av den hårda konkurrensen på upphandlingsmarknaden har visat sig vara att en del leverantörer lämnar anbud med onormalt låga priser för att vinna upphandlingskontraktet. Förekomsten av onormalt låga anbud i offentliga upphandlingar medför allvarliga negativa konsekvenser såsom att konkurrensen snedvrids, effektiviteten minskar och kostnaderna ökar. Detta påverkar både den upphandlande enheten, leverantören som bjudit onormalt lågt, de leverantörer som slagits ut samt konsumenterna. Att det saknas ett förbud i upphandlingslagstiftningen mot att anta onormalt låga anbud är därför allvarligt. Syftet med denna framställning är att undersöka innebörden av begreppet onormalt lågt anbud i offentliga upphandlingar, belysa problemet med och konsekvenserna av att lagstiftning och regelverk inte i tillräcklig utsträckning uppmärksammar de risker som kan vara förenade med antagandet av onormalt låga anbud samt försöka finna en lösning på problemet. / As a result of Sweden’s membership of the European Union, public procurement has gained more importance, mainly due to the larger geographic territory available. As a consequence of this, competition has become more aggressive and new rules are being incorporated into Swedish law in step with the fast development. One of the results of the tough competition in the public procurement market is that companies may be forced into potentially unsustainable under-bidding in order to win contracts. The presence of these abnormally low tenders in public procurement may have serious negative consequences such as distortion of competition and reduced efficiency, potentially causing delays and waste of resources in the procurement process. This will affect both the contracting authority, the tenderer that has won on an abnormally low bid, the other unsuccessful tenderers, and the ultimately consumers. The fact that public procurement law does not prohibit authorities from accepting abnormally low tenders is therefore potentially very serious. The main objective of this dissertation is to examine the significance of the concept of abnormally low tender, to illuminate the issues surrounding and consequences of the legislative lack of attention to the risks associated with accepting abnormally low tenders, and finally to propose solutions to these issues.

Låga moln definieras av att ha molnbasen från 0 till 2 km ovanför markytan. Molnbildande bygger på att den relativa fuktigheten stiger med höjden tills vattenångan i luften kondenseras. Prognosmodeller för moln bygger på grundläggande termodynamiska och fluiddynamiska ekvationer. Områden delas in i ett rutnät och ekvationerna löses med numeriska metoder. För jämförelse kan mätinstrument samt observationer användas, såsom ceilometrar, radar eller observatörer.  Resultat från fyra olika experiment med prognosmodeller för moln används i detta arbete, som är en litteraturstudie för att undersöka modellers förmåga att simulera låga moln. Olika platser, på global och lokal skala, undersöks. Makroskopiska parametrar såsom molnandel och molnfrekvens är i fokus.  WRF-modellen fungerar bäst med 12 km horisontell upplösning, med en viss överskattning av molnfrekvensen. Modellen CAM5 simulerar molnandel väl men vatteninnehåll och isinnehåll underskattas respektive överskattas. Säsongscykler av låga moln fångas väl av modellerna ECMWF, ARPEGE, RACMO och Met Office, med viss överskattning från samtliga modeller. GFS-modellen överskattar molnandelen långt från ekvatorn med upp mot 80% men underskattar nära ekvatorn med 10–20%. Överskattningar och underskattningar kan bero på faktorer såsom otillräcklig representation av mikrofysik eller möjligtvis felaktiga mätdata. Det denna studie visar är däremot att prognosmodeller på lokal skala kan ge bra simuleringar av makroskopiska parametrar av låga moln. / Cloud types are defined by the height of their bases. Low-level clouds have cloud base heights between 0 and 2 km. They are formed when the relative humidity in the air reaches 100 %, leading to the formation of cloud droplets. Forecast models simulate clouds by integrating thermodynamic and fluid dynamic equations using numerical methods. Instruments and observations, such as ceilometers or observers, are used to assess the accuracy of these simulations.  This study uses four previous works, where forecast models have been used to forecast clouds, to study the accuracy of low-level cloud forecasts. This is done on both local and global scales, focusing on macroscopic characteristics such as cloud fractions and frequencies. The results show that the WRF model works best with a horizontal resolution of 12 km, with slight overestimation of cloud frequencies. The climate model CAM5 simulates cloud fractions well, but liquid- and ice content deviate significantly from measurements. Seasonal cycles are generated well by ECMWF, ARPEGE, RACMO and Met Office Unified Model, with reoccurring overestimations by all models. The GFS model overestimates cloud fractions in higher latitudes by up to 80%, but underestimates near the equator by 10-20%.  Lacking representation of microphysics in the models, or faulty data, can be the causes for deviations in the models. However, this study has shown that forecast models can simulate macroscopic parameters of low-level clouds on a local scale well.

Algebra is an important part of the Swedish curriculum and is something that many students have difficulties with. Every student in upper secondary school in Sweden has to be given opportunities to develop their knowledge according to the curriculum. Therefor it is important to adapt the education conducted in order to give all students possibility to develop their knowledge. The aim of this study is to investigate how students with low achievements in mathematics experience the education in algebra in their first year at a vocational program in upper secondary school and investigate what difficulties they have with algebra. To reach the aim, qualitative interviews with eight students from vocational programs in their first year upper secondary school were conducted. The result shows that the students have a positive view on the recent education in algebra. Their experience put forth the education pace, work models and content and outlines of the lessons. Their difficulties in algebra is related to insecurity and can be explained through difficulties with the mathematic language, flaws in arithmetic and low level of abstraction. The result reinforces previous research and contributes with important knowledge to be aware of when planning and teaching algebra. / Algebra är ett av de centrala innehållen i matematikkurserna och är något som många elever har svårt med. Enligt läroplanen för gymnasieskolan ska skolan ge alla en möjlighet till att utvecklas. Därför är det viktigt att undervisningen utformas så att den ger möjlighet till alla elever att utvecklas. Syftet med studien är att undersöka hur elever med låga prestationer i matematik upplever algebraundervisningen i årskurs ett på yrkesförberedande program i gymnasieskolan och undersöka vilka svårigheter dessa elever har i algebra. Kvalitativa intervjuer med åtta elever som går i årskurs ett på yrkesförberedande program i gymnasieskolan genomfördes. Resultatet visar att eleverna har en positiv syn på algebraundervisningen som de nyligen fått. Deras upplevelse handlar om undervisningstempot, arbetsformer och lektionernas innehåll och form. Svårigheterna beror på osäkerhet i att arbeta med algebra och kan förklaras utifrån bristande aritmetiska kunskaper, brister i det matematiska språket och låg abstraktionsförmåga. Resultatet förstärker tidigare forskningsresultat och visar viktiga aspekter att beakta vid planering och utformande av algebraundervisningen.

<p>Three different factors are thought to be involved in the increased segregation in Stockholm: the living segregation, scientific and political dissonances and the social economical factor. Many segregated areas have many inhabitants with foreign background. Schools in these areas have a higher number of students with lower grades compared to other schools with higher number of students that are ethnical Swedes. Jordbromalmsskolan is a school in Haninge kommun that is one of the seven schools in Stockholms suburbs where students graduate with the lowest grades. The school is suffering from a very bad reputation because of many problems like fights between students and lack of resources like purchase stop. The aim with this report is to find out what students believe is difficult with the schoolwork and thereby find the causes for why there is such a high number of student with low grades in Jordbro compared to other areas in Stockholm. Student’s thoughts and outlooks about Jordbromalmsskolans bad reputation will also be a focus through interviews with eight students, four student from class 8C and fours students from class 9C.</p><p>Results from the examinations showed that many students found it difficult to concentrate during class-time. Many students also found that they had lack in knowledge in the Swedish language which affected difficulties in reading and understanding of schoolbooks. Too many homework and tests is another factor that students think complicate there schoolwork.</p><p>Social studies and Science are the two subjects that majority of the students thought were the most difficult ones because of the difficult language and terms used in the literature. When it came to Jordbromalmsskolans bad reputation all the students disagree. No student that was interviewed wanted to change school and majority of the student’s get on well with their friends and teachers. The students believe that the schools bad reputation mostly depend on that the school has a high number of students with foreign backgrounds which has contributed to that many students finish school with low grades, one factor to this problem is believed to be the lacking knowledge in insecurity of the Swedish language.</p>

Three different factors are thought to be involved in the increased segregation in Stockholm: the living segregation, scientific and political dissonances and the social economical factor. Many segregated areas have many inhabitants with foreign background. Schools in these areas have a higher number of students with lower grades compared to other schools with higher number of students that are ethnical Swedes. Jordbromalmsskolan is a school in Haninge kommun that is one of the seven schools in Stockholms suburbs where students graduate with the lowest grades. The school is suffering from a very bad reputation because of many problems like fights between students and lack of resources like purchase stop. The aim with this report is to find out what students believe is difficult with the schoolwork and thereby find the causes for why there is such a high number of student with low grades in Jordbro compared to other areas in Stockholm. Student’s thoughts and outlooks about Jordbromalmsskolans bad reputation will also be a focus through interviews with eight students, four student from class 8C and fours students from class 9C. Results from the examinations showed that many students found it difficult to concentrate during class-time. Many students also found that they had lack in knowledge in the Swedish language which affected difficulties in reading and understanding of schoolbooks. Too many homework and tests is another factor that students think complicate there schoolwork. Social studies and Science are the two subjects that majority of the students thought were the most difficult ones because of the difficult language and terms used in the literature. When it came to Jordbromalmsskolans bad reputation all the students disagree. No student that was interviewed wanted to change school and majority of the student’s get on well with their friends and teachers. The students believe that the schools bad reputation mostly depend on that the school has a high number of students with foreign backgrounds which has contributed to that many students finish school with low grades, one factor to this problem is believed to be the lacking knowledge in insecurity of the Swedish language.

Studiens syfte är att undersöka arterna Buxbaumia viridis och Nowellia curvifolia för att kunna förutse var man hittar dessa signalarter. Detta gjordes genom att död liggande ved undersöktes i Ycke naturreservat samt en närliggande brukas skog, Östergötlands län. Resultaten visar att faktorerna som är avgörande för B. virids är markkontakt och nedbrytningsklass. B. viridis föredrar att växa på lågor i de högre nedbrytningsklasserna (4-7) och med stor andel markkontakt, över 80 %. N. curvifolia beror på diameter (över 60cm), nedbrytningsklass (3-4) och längd (över 30m). Baserat på dessa resultat, kan signalarter lättare upptäckas utan en fullskalig inventering av skogen. / Young trees dominate Swedish forests, which today have a shortage of downed dead wood, key biotopes, and an overall lack of high natural values. By using the mosses Buxbaumia viridis and Nowellia curvifolia the general state of a forest can be assessed. These species indicate high natural values, with a continuity of dead wood in different stages of decay. By investigating ground-lying dead wood, one can predict if the mosses occur in the area or not. This is useful for maintenance of the forests and the preservation of biological diversity. The purpose of this study was to study the species B. viridis and N. curvifolia in Ycke natural reserve in Östergötland, southern Sweden, and learn how to predict where these species occur. The results showed that ground contact (over 80 %) and stage of decay (stage 4-6) of logs were important to B. viridis, with test values 30- 50 times as high as the other test values. To N. curvifolia, the diameter of the logs was the most important. Decay stage and length of the log were also important factors to N. curvifolia. Based on these results, these indicator species can more easily detected without a full scale inventory of the forest.

In contemporary society, a common aim is to increase sustainable travel in order to foster the ecological environment. This is to be made possible by a transformation in travel modes from car to public transport, walking and cycling. Stockholm, which is the city focused on in this study, is currently growing. This further results in increased demands for infrastructure and housing. Municipalities have started to allow real estate actors to include Mobility Management measures in housing development in exchange for lower parking demands, to further support the modal change. Such measures can for example be defined as memberships in carpools, cycle pools, information and knowledge exchange. Thus, such implementations are stated as useful methods, however, the effects are poorly assessed and are difficult to measure. According to this, the purpose of this study is to examine relationships between residents' attitudes and behaviours and Mobility Management measures in newly developed housing projects with low parking numbers. The three projects of Flora, Nor and Kavringen were selected, due to the possibility of comparison. The focus has chosen to be on residents' perspectives, as they are the definitive users of the measures. Theories of attitudes and habits have further been used as a framework in order to obtain a greater understanding of the residents' relationship to the measures and to sustainable travel in general. The results, which are based on surveys and interviews, show a variation in attitudes towards sustainable travel and travel modes among the users between and within the study objects. Many appear to treasure sustainable traveling in order to foster the environment and according to this, they seem to have advantageous attitudes towards such travel modes. More residents seem to also travel with sustainable modes. However, other factors than supporting the environment seem to steer respondents in their modal choices. Several residents do also value car use to a high extent. With regards to the Mobility Management measures, the average usage has appeared to be low. This seems to be a result of a shortage in information, logistics, accessibility and in addition, the measures appear to not be competitive enough to respond to the users' needs. Based on demographic factors, time, economy, comfort, accessibility to service and work and the Covid 19 pandemic, such aspects seem to affect users' modal choices more than for them to travel in a way to support the ecological environment. / I den nuvarande samhällskontexten talas det om att öka andelen hållbara resor för att minska miljöpåverkan, vilket innebär en förändring i färdmedelsval från bil till kollektivtrafik, gång och cykel. Denna studie utgår från ett Stockholmsperspektiv, en stad som växer och där nya behov vad gäller infrastruktur och bostäder behöver tillgodoses. För att stötta dessa förändringar har kommuner börjat låta byggaktörer införa Mobility Management-åtgärder till fördel för lägre parkeringstal. Sådana åtgärder syftar till beteende- och attitydförändringar och kan handla om medlemskap i bilpooler, cykelpooler, informations- och kunskapsspridning. Idag finns ett behov av att studera resultaten av införandet av sådana åtgärder, eftersom de anses vara en bra metod men där effekterna är svåra att mäta. Därför är syftet med denna studie att undersöka förhållandet mellan Mobility Management-åtgärder och boendes attityder och beteenden i tre nya bostadsprojekt med låga parkeringstal. De tre bostadsprojekten Flora, Nor och Kavringen valdes ut, med intentionen att möjliggöra jämförelse dem emellan. Inom ramen för studien har boendes perspektiv fokuserats på, eftersom de som är de slutgiltiga användarna. För att få en djupare förståelse för deras förhållande till sådana åtgärder och slutändan hållbart resande, har teorier om vanor och attityder, samt korrelationen mellan dessa termer använts som ramverk. Resultaten, som baseras på enkäter och intervjuer med de boende, visar att attityderna till både hållbart resande och hållbara färdmedel skiljer sig mellan och inom projekten. Många reser i stor utsträckning med hållbara färdmedel. Dessutom anser en stor andel det vara viktigt att resa hållbart för miljöns skull och därmed har de goda attityder till ett sådant resande. Trots det verkar andra faktorer vara mer avgörande för de flesta än miljöfördelaktiga attityder när det kommer till faktiska färdmedelsval. En stor andel värderar dessutom bilägande högt och använder bil regelbundet. Med avseende på Mobility Management-åtgärderna är användningsgraden låg, vilket verkar bero på informations- och logistikbrister, otillgänglighet samt att de inte är tillräckligt konkurrenskraftiga för att svara mot användarnas behov. Med hänsyn till det sistnämnda verkar andra faktorer som tid, ekonomiska och demografiska aspekter, bekvämlighet, Covid 19-pandemin samt tillgänglighet till stadsmässiga fördelar och innerstaden tillsammans spela större roll för färdmedelsval än att resa hållbart av miljöskäl.

The aim of this thesis was to make a practical tool for low frequency analysis in room acoustics.The need arises from Acad’s experience that their results from simulations using raytracing software deviate in the lower frequencies when compared to field measurements inrooms. The tool was programmed in Matlab and utilizes the Finite Difference Time Domain (FDTD) method, which is a form of rapid finite element analysis in the time domain.A number of tests have been made to investigate the practical limitations of the FDTD method, such as numerical errors caused by sound sources, discretization and simulation time. Boundary conditions, with and without frequency dependence, have been analysed bycomparing results from simulations of a virtual impedance tube and reverberation room to analytical solutions. These tests show that the use of the FDTD method appears well suited for the purpose of the tool.A field test was made to verify that the tool enables easy and relatively quick simulations of real rooms, with results well in line with measured acoustic parameters. Comparisons of the results from using the FDTD method, ray-tracing and finite elements (FEM) showed goodcorrelation. This indicates that the deviations Acad experience between simulated results and field measurements are most likely caused by uncertainties in the sound absorption data used for low frequencies rather than by limitations in the ray-tracing software. The FDTDtool might still come in handy for more complex models, where edge diffraction is a more important factor, or simply as a means for a “second opinion” to ray-tracing - in general FEM is too time consuming a method to be used on a daily basis.Auxiliary tools made for importing models, providing output data in the of room acoustic parameters, graphs and audio files are not covered in detail here, as these lay outside the scope of this thesis. / Målet för detta examensarbete var att undersöka möjligheten att programmera ett praktisktanvändbart verktyg för lågfrekvensanalys inom rumsakustik. Behovet uppstår från Acadserfarenhet att resultat från simuleringar med hjälp av strålgångsmjukvara avviker i lågfrekvensområdeti jämförelse med fältmätningar i färdigställda rum. Verktyget är programmerati Matlab och använder Finite Difference Time Domain (FDTD) metoden, vilket är en typav snabb finita elementanalys i tidsdomänen.En rad tester har genomförts för att se metodens praktiska begräsningar orsakade av numeriskafel vid val av ljudkälla, diskretisering och simuleringstid. Randvillkor, med och utanfrekvensberoende, har analyserats genom jämförelser av simulerade resultat i virtuella impedansröroch efterklangsrum mot analytiska beräkningar. Testerna visar att FDTD-metodentycks fungerar väl för verktygets tilltänkta användningsområde.Ett fälttest genomfördes för att verifiera att det med verktyget är möjligt att enkelt och relativtsnabbt simulera resultat som väl matcher uppmätta rumsakustiska parametrar. Jämförelsermellan FDTD-metoden och resultat beräknade med strålgångsanalys och finita elementmetoden(FEM) visade även på god korrelation. Detta indikerar att de avvikelser Acaderfar mellan simulerade resultat och fältmätningar troligen orsakas av osäkerheter i den ingåendeljudabsorptionsdata som används för låga frekvenser, snarare än av begränsningar istrålgångsmjukvaran. Verktyget kan fortfarande komma till användning för mer komplexamodeller, där kantdiffraktion är en viktigare faktor, eller helt enkelt som ett sätt att få ett”andra utlåtande” till resultaten från strålgångsmjukvaran då FEM-analys generellt är en förtidskrävande metod för att användas på daglig basis.Kringverktyg skapade för t.ex. import av modeller, utdata i form av rumsakustiska parametrar,grafer och ljudfiler redovisas inte i detalj i denna rapport eftersom dessa ligger utanförexamensarbetet.

<p>A study of air mass origin’s effect on marine stratus and stratocumulus clouds has been performed on clouds north of Scandinavia between 2000 and 2004. The aerosol number size distribution of the air masses has been obtained from measurements in northern Finland. A trajectory model has been used to calculate trajectories to and from the measurement stations. The back trajectories were calculated using the measurement site as receptor to make sure the air masses had the right origin, and forward trajectories were calculated from receptor stations to assure adequate flow conditions. Satellite data of microphysical parameters of clouds from the Moderate Resolution Imaging Spectrometer (MODIS) has been downloaded where the trajectories indicated that clouds could be studied, and where the satellite images displayed low-level clouds. The 25 % days with the highest number of aerosol with a diameter over 80 nm (N₈₀) and the 35% with the lowest N₈₀ have been used to represent polluted and clean conditions respectively. After screening trajectories and satellite imagery, 22 cases of clouds with northerly trajectories that had low N₈₀ values (i.e. clean) and 25 southerly cases with high N₈₀ values (i.e. polluted) where identified for further analysis.</p><p>   The average cloud optical thickness (τ) for all polluted pixels was more than twice that of the clean pixels. This can most likely be related to the differences in aerosol concentrations in accordance with the indirect effect, yet some difference in τ caused by different meteorological situations cannot be ruled out. The mean cloud droplet effective radius (a_ef) was for the polluted pixels 11.2 µm and for the clean pixels 15.5 µm, which results in a difference of 4.3 µm and clearly demonstrates the effect that increased aerosol numbers has on clouds. A non-linear relationship between a_ef and N₈₀ has been obtained which indicates that changes in lower values of aerosol numbers affect a_ef more than changes in larger aerosol loads. The results from this study also indicate that there is a larger difference in the microphysical cloud parameters between the polluted and clean cases in spring and autumn than in summer.</p>

A study of air mass origin’s effect on marine stratus and stratocumulus clouds has been performed on clouds north of Scandinavia between 2000 and 2004. The aerosol number size distribution of the air masses has been obtained from measurements in northern Finland. A trajectory model has been used to calculate trajectories to and from the measurement stations. The back trajectories were calculated using the measurement site as receptor to make sure the air masses had the right origin, and forward trajectories were calculated from receptor stations to assure adequate flow conditions. Satellite data of microphysical parameters of clouds from the Moderate Resolution Imaging Spectrometer (MODIS) has been downloaded where the trajectories indicated that clouds could be studied, and where the satellite images displayed low-level clouds. The 25 % days with the highest number of aerosol with a diameter over 80 nm (N80) and the 35% with the lowest N80 have been used to represent polluted and clean conditions respectively. After screening trajectories and satellite imagery, 22 cases of clouds with northerly trajectories that had low N80 values (i.e. clean) and 25 southerly cases with high N80 values (i.e. polluted) where identified for further analysis.    The average cloud optical thickness (τ) for all polluted pixels was more than twice that of the clean pixels. This can most likely be related to the differences in aerosol concentrations in accordance with the indirect effect, yet some difference in τ caused by different meteorological situations cannot be ruled out. The mean cloud droplet effective radius (aef) was for the polluted pixels 11.2 µm and for the clean pixels 15.5 µm, which results in a difference of 4.3 µm and clearly demonstrates the effect that increased aerosol numbers has on clouds. A non-linear relationship between aef and N80 has been obtained which indicates that changes in lower values of aerosol numbers affect aef more than changes in larger aerosol loads. The results from this study also indicate that there is a larger difference in the microphysical cloud parameters between the polluted and clean cases in spring and autumn than in summer.