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Mobbningen i skolorna har ökat. Indirekt mobbning är svårupptäckt, eftersom den är ämnad att döljas för alla utom den utsatta. Skolpersonals okunskap och subjektiva bedömningar i mobbningsincidenter begränsar elevers utsikter att få gehör vid rapportering. Syftet med denna studie var att undersöka skolpersonals erfarenheter av lågstadieelevers rapportering av indirekt mobbning och att belysa strategier skolor har för att upptäcka lågstadieelevers utsatthet. Kvalitativ analys av åtta semistrukturerade intervjuer med yrkesverksamma inom lågstadiet, utfördes. Det framkom existera ett mörkertal av indirekt mobbning på lågstadiet, varpå deltagarna insisterade på samverkan och kunskap för att upptäcka utsatthet. Krav på arbetet bidrog till upplevd stress, vilket försummade möjligheterna till anknytning mellan personal och elever. Teoretiskt kopplades studien till anknytningsteorin då både forskning och denna studies deltagare menar att tillit skapar förutsättningar för att elever ska rapportera mobbning. Slutsatsen dras att ökad bemanning kan stärka tilliten i elev-personalrelationer, vilket således ökar utsikterna att indirekt mobbning upptäcks.

This study explores how native and nonnative English speakers understand and perceive directness types in written teacher feedback (WTF). Currently research suggests that indirect speech in WTF will encourage students to think and maintain politeness between teacher and student (Benkendorf, 2001; Riley, 2003; Thonus, 1999; Vassileva, 2000). However, research also indicates that indirect speech may be more difficult to interpret than direct speech (Champagne, 2001; Holtgraves, 1999), which suggests that indirect speech used in WTF may be difficult for students to interpret and use to improve their compositions (Ferris, 2007; Hyland & Hyland, 2001). This difficulty may be even more acute for second language (NNS) learners (Ferris, 2002; Mackiewicz & Riley, 2002, 2003). This thesis will test and propose refinements to this study. In this study, native (NS) and nonnative (NNS) English speaking university students, were given two essays directness of the WTF. These participants had three main tasks: 1. to identify whether or not WTF requests a correction, 2. to make the correction if requested, 3. to identify perceptions of the teacher and paper based on the WTF. For the first two tasks, accuracy and response times were calculated. Results showed that directness type affects the speed and accuracy of both NS and NNS learners. Direct speech in WTF was more quickly identified than indirect speech (indirect speech acts and hedging). Indirect speech was the slowest and least accurate for both NS and NNS learners in relation to positive WTF. Surprisingly, both NS and NNS were slowest for making corrections on direct WTF. In addition, directness type also affected the perception on the teacher and paper. For example, NS were likely to perceive indirect speech as being from a female teacher. NNS were more likely to give papers with hedged WTF an A and those with indirect WTF a C grade. This study suggests that the directness type of WTF affects how quickly and how well it is understood by both NS and NNS learners. It also suggests that the pragmatic theory may explain why direct speech is processed more quickly than indirect speech (indirect speech acts and hedging).

The entropy noise in modern engines is mainly originating from two types of mechanisms.First, chemical reactions in the combustion chamber lead to unsteady heat releasewhich is responsible of the direct combustion noise. Second, hot and cold blobsof air coming from the combustion chamber are advected and accelerated throughturbine stages, giving rise to the so-called entropy noise (or indirect combustionnoise). In the present work, numerical characterization of indirect combustion noiseof a Nozzle Guide Vane passage was assessed using three-dimensional Large EddySimulations. The study was conducted on a simplified topology of a real turbinestator passage, for which experimental data were available in transonic operatingconditions. First, a baseline case was reproduced to validate a numerical finite volumesolver against the experimental measurements. Then, the same solver is used toreproduce the effects of incoming entropy waves from the combustion chamber andto characterize the additional generated acoustic power. Periodic temperature fluctuationsare imposed at the inlet, permitting to simulate hot and cold packets of aircoming from the unsteady combustion. The incoming waves are characterized bytheir characteristic wavelength; therefore, a parametric study has been conductedvarying the inlet temperature of the passage, generating entropy waves of greaterwavelengths. The study proves that the generated indirect combustion noise canbe significant. Moreover, the generated indirect combustion noise increases as thewavelength of the incoming disturbances increases. Finally, the present work suggeststhat, in transonic conditions, there might be flow features which enhance theindirect combustion noise generation mechanism.

The objectives of this research were to evaluate the sensitivity of indirect tensile strength (ITS) test results to stabilizer type, stabilizer concentration, and curing time for multiple clayey soils with varying plasticity indices (PIs), identify cases in which an ITS of 30 psi can be obtained, and create a general linear model that predicts ITS. The scope of work included laboratory testing of three clayey soils sampled from Monticello, Utah; Bloomington, Indiana; and San Antonio, Texas. Each soil was tested using two stabilizers, cement or lime, at three concentrations, and two replicate samples were prepared for each combination. ITS testing was performed on two specimens of each combination at curing times of both 7 days and 28 days, for a total of 72 tests. The procedures outlined in this study include soil characterization, determination of moisture-density relationships, Eades and Grim testing, soil preparation, soil compaction, ITS testing, and statistical analysis. Regarding stabilizer type, treatment with cement consistently yielded higher ITS values than treatment with lime. Regarding stabilization concentration, ITS consistently increased with increasing concentrations of cement for all three soils; however, the effect of lime concentration depended on the PI of the soil, where increasing ITS values were only apparent with higher PI values. Regarding curing time, the ITS values corresponding to 28 days were generally higher than those corresponding to 7 days. Differences in ITS among the soils were largely attributable to differences in PI, which can influence pozzolanic reactivity. A cement or lime concentration that was equal to or 2% above the lime concentration indicated by the Eades and Grim test was typically required for a minimum 28-day ITS value of 30 psi to be attained. For the model developed to predict ITS, the significant predictor variables included PI, stabilizer type, actual stabilizer concentration, and curing time, as well as the two-way interactions between PI and stabilizer type, PI and actual stabilizer concentration, PI and curing time, and stabilizer type and actual stabilizer concentration. Overall, the model has an R2 value of 0.943 and an adjusted R2 value of 0.936. The model is best suited for soils having a fines content greater than 50%, a PI greater than 20, and a soluble sulfate concentration less than 3000 ppm.

Moisture damage in asphalt pavement has always been a problem for drivers, bicyclists, and pedestrians. The primary objective of this study is to evaluate moisture susceptibility of Hot-Mix Asphalt (HMA) and to investigate mitigation techniques using different antistripping agents. Three types of antistripping agents were used in this research investigation. Two of which are chemical based and the other is hydrated lime. The two types of liquid antistripping agents used in this study include Arr Maz CC LOF-6500 and Arr Maz CC XL-9000. These two liquid antistripping agents were tested at 0.25%, 0.50%, and 0.75%. Hydrated Lime was tested at 1.0%, 1.5%, and 2.0%. The binder used in this study is Asphalt Performance Grade (PG) 64-16 provided by Oxnard Refinery. The crushed stone aggregate used in this study was provided by Cal Portland. This study follows the guidelines of standardized AASHTO, ASTM, and SuperPave mix design for all preparation and test procedures. A total of 120 4-inch by 2.83-inch core specimens with void ratios between 6 to 8 percent were created to test for moisture susceptibility in accordance with the Modified Lottman Test, which tested for Indirect Tensile Strength and Immersion Compression Test, which tested for Compression Strength and Elasticity. During the test, half of these specimens were placed in a hot water bath for 24 hours to condition the sample to represent field performance and the other half were unconditioned. Based on the results, the best liquid antistripping agent is XL-9000 at 0.50% and hydrated lime is most efficient at a dosage rate of 1.5%. The best performing antistripping additive for the value is hydrated lime at 1.5%.

京都大学 / 新制・課程博士 / 博士(地球環境学) / 甲第24305号 / 地環博第236号 / 新制||地環||45(附属図書館) / 京都大学大学院地球環境学舎環境マネジメント専攻 / (主査)准教授 森 晶寿, 教授 竹内 憲司, 教授 西前 出, 教授 水野 広祐 / 学位規則第4条第1項該当 / Doctor of Global Environmental Studies / Kyoto University / DFAM

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