This dissertation examines the cultural, political, and artistic role of polychrome wall painting from funerary contexts in South Italy during the critical period that spans the crisis of Greek hegemony and the consolidation of Roman power. Numerous painted tombs were built between the late fifth and the early second centuries BCE for local as well as Greek elite groups across Southern Italy. I investigate the ways in which the wall paintings, with their colors, iconographies, and technical features were both the expression of indigenous cultures and local artistic trends, and a part of a wider and more complex phenomenon, that is the diffusion of funerary wall painting in the Mediterranean during the late Classical and Hellenistic period. Why did polychromy become a crucial component in articulating funerary space in South Italy towards the end of the fifth century BCE, and how did this experience develop in the regions of Campania, Lucania, and Apulia, respectively? Ever since the South Italian painted tombs were discovered in the nineteenth and twentieth centuries, scholars have interpreted their decoration as ideal representations of the deceased, their funerary ceremony, or their journey to the Underworld. They have focused on the relationship between the images and the individual deceased buried in the tomb or the restricted group of their family/clan. In my study, I seek to restore the polysemic character of the wall paintings. Each chapter analyzes the paintings from a different perspective and with a particular methodological approach, combining archaeological, anthropological, topographic, historical, and artistic evidence. I argue that the tombs with their painted decoration served to build and articulate collective memory, elaborating a message which was supposed to address the local community. I propose that the figural scenes depicted on the tomb walls staged ritual activities and initiation ceremonies which marked the life of the whole community. I also reconsider the artistic development of funerary painting in Southern Italy, showing that this phenomenon did not derive from globalizing trends of "Hellenization" or "Romanization", as has often been suggested, but it was intimately connected to indigenous artistic traditions and local or regional socio-political dynamics. / The Classics

The peptidoglycan of many Gram-positive bacteria is densely functionalized with anionic glycopolymers called wall teichoic acids (WTAs). Recent studies have shown that these polymers play crucial roles in cell shape determination, regulation of cell division, and other fundamental aspects of Gram-positive bacterial physiology. Furthermore, in pathogens they are important in host infection and play key roles in antibiotic resistance. In many cases, precise mechanisms for WTA involvement in these processes have not been established. In order to better understand the roles of WTAs in the biology of the human pathogen Staphylococcus aureus, we sought to identify their interactions with other cellular pathways. By employing a transposon screen, we found that lipoteichoic acid (LTA) synthesis, D-alanylation of teichoic acids, cell wall stress sensors, CAAX-like proteases, and peptidoglycan biosynthesis were all synthetically lethal with depletion of WTAs in Staphylococcus aureus . Further investigations revealed that several genes required when WTAs were depleted were not essential when LTAs were removed. Unexpectedly, TA D-alanylation, became essential in the absence of WTAs, but not LTAs. Examination of terminal phenotypes following WTA depletion revealed that strains lacking LTA D-alanine esters died from envelope rupture during ongoing cell division whereas strains lacking LTAs were unable to form Z rings, stopped dividing, and had altered PG biosynthesis. Finally, we designed and implemented parallel, pathway-specific chemical screens to identify inhibitors that specifically kill mutants deficient in WTAs or D-alanylation of TAs. In addition to elucidating new interactions between cell envelope pathways, and establishing distinct roles LTAs and WTAs in the cell envelope of S. aureus, these experiments provide a list of potential targets and a strategy for identifying inhibitors for these targets, in compound combinations as therapeutics against antibiotic-resistant S. aureus infections.

When excavating a rock wall by blasting, pre-existing structures in the rock has a strong impact on the stability of the wall. For excavation in Bandhagen in Stockholm, the nature and orientation of the pre-existing geological features, namely fractures, were not taken into consideration before excavation begun. Geological field studies were carried out in order to investigate the possibility of a more favorable outcome than in the Bandhagen case. Mapping conducted in March 2015 was focused on fracture distribution and the results showed two sets of open shear fractures with fresh surfaces. The first set of the fractures cross-cuts the wall with a strike of NNW-SSE and dips between 70°±30°. The second set of fractures strikes WSW-ENE and are almost parallel to the wall (which strikes roughly 65° E) with a dip towards it, ranging between 55°±35°. The two set of fractures intersect with an acute angle of around 80° and due to their orientation, and that one of the sets dip towards the free face of the wall, they create an unfavorable fracture pattern that makes the wall, at parts, very instable in regard to rockfall and rockslide.  Fractures within the respective sets dip towards opposite cardinal points and making an acute angle of 50° for set 2 and 70° for set 1 fractures within the own set are interpreted to conjugate. In addition, there is a well-developed folded foliation that change in strike from parallel to perpendicular to the excavated wall. The foliation is aligned to the strike of both of the fracture sets. This has enabled fractures to open parallel to the mica-rich layers in the gneiss which further adds to the unfavorable pattern of fractures that creates rhombohedral unstable blocks in the rock mass. Due to the fracture pattern, sliding and rockfall have been frequent and safety measures such as rock bolts and a wire mesh have been installed to increase the security factor for the wall. During mapping, a general fracture pattern was possible to deduce from mapping of solely an unexcavated, vegetated part of the area. It became clearer though together with the excavated surface of the wall. Several pre-blast measures could have been preformed to limit rockfall and sliding of rock after excavation. Line-drilling could have been used when blasting near the contour of the wall to decrease the blast-induced fractures by the more effective venting of the excess explosion gas. This could have decreased the closely spaced blast-induced fractures that have been mapped on both the crest and the body of the wall. Another measure would have been to install pre-blast reinforcements on the crest of the wall, which could have prevented at least two large rockfalls that have occurred.  If the fracture pattern were known before excavation begun and the aforementioned measures would have been considered, the stability of the wall and the first excavation would undoubtedly have been more successful. A proposal for future open face excavations is to thoroughly assess the geological features to, in a preliminary stage of the planning, eliminate the risk for this outcome to occur in the future. / Vid uttag av berg genom sprängning för att skapa en bergvägg har strukturerna i berget en stor betydelse för stabiliteten av väggen. Exempel på strukturer i berggrunden som kan orsaka problem vid uttag av berg är sprickor och då speciellt sprickor som stupar mot väggens teoretiska kontur. Dessa sprickor kan orsaka att hela skivor av berg kan glida från väggen. Om dessa sprickor också korsas av andra sprickor kan de tillsammans bilda kilar som stupar ut mot den fria ytan där utschaktning av berg skett. Kilar som dessa som förekommer på krönet av bergväggen faller ofta ut från väggen och kan vara både farliga för de som utför arbetet samtidigt som de kan göra block runtomkring dem mer instabila.  För en utschaktning av berg i Bandhagen, Stockholm togs inte sprickmönstret in i planeringen inför hur sprängning skulle utföras. Detta ledde till att sprängningen som utfördes orsakade mycket glidningar av block och utfall från krönet. Det har lett till att projektet blivit försenat och budgeten överskridits för att korrigera de misstag som gjorts. Korrigeringarna har varit nödvändiga för att väggen i slutändan ska nå en säkerhetsfaktor som inte kan orsaka några person- eller materialskador i framtiden.  Kartering med fokus på sprickfördelning utfördes i Mars 2015 för att undersöka om sprängningen hade kunnat utföras på ett annorlunda och bättre sätt om sprickmönstret varit känt innan sprängning inleddes. Karteringen visade två korsande spricksystem där ett av spricksystemen stryker parallellt med väggen och även stupar mot den. De två systemen av sprickor bildar block med plan som lutar ut från väggen vilket resulterar i att många utfall av block skett. Med vetskapen om dessa spricksystem, samt övriga sprickor som förekommer i området, hade de utfall av berg som skett kunnat förutsägas och därigenom hade förslag av sprängmetodik kunnat ges för att minska utfall och för att generellt fått en säkrare vägg redan ifrån början. Både sprängning med tätsöm nära den teoretiska konturen av väggen och förförstärkning av krönet av den teoretiska väggen innan första sprängningen hade kunnat leda till en mycket stabilare vägg. Det hade kunnat leda till att projektet inte blivit försenat och att budgeten för projektet tagit hänsyn till de problem som skulle kunna uppstå.  Ett förslag för uttag av berg för bergsslänter är att de geologiska förhållandena ska undersökas mer noggrant, för att i ett tidigt skede upptäcka liknande strukturer i berget och utifrån dessa eliminera risken för att liknande problem uppstår i framtiden.

published_or_final_version / Geography and Geology / Master / Master of Philosophy

In a novel application of the temporal numerical simulation, an investigation ofturbulence modeling techniques is carried for the turbulent wall jet over aconvex surface (Coanda wall jet.) The simultaneous presence of multipleinstability mechanisms and the interaction with the turbulence dynamics at thesolid boundary produces a unique combination of different large turbulentcoherent structures that constitutes both a consistent challenge for numericalsimulations and an ideal test bed for turbulence models.The Temporal Direct Numerical Simulation (TDNS) of the Coanda wall jetrestricts the focus from the global turbulent Coanda wall jet to a smaller, localportion of the flow and offers a wide array of advantages to the present work. Inparticular, the size of the computational domain can be arbitrarily chosen inboth the spanwise and the streamwise directions. This allows to either suppressor enhance individual physical mechanisms and, consequently, to selectivelyreproduce different large coherent structures within the local flow. In the firstpart, temporal numerical simulations are employed to reproduce four differentflow scenarios of the local Coanda wall jet with a level of numerical resolutionthat, because of the reduced size of the computational domain, cannot be matchedby standard DNS of the entire physical flow (spatial DNS, or SDNS.)The TDNS of these four flow scenarios are then used in the second part for ana--posteriori analysis of different turbulence models in order to addresscommon shortcomings shown by Hybrid Turbulence Models (HTM). For each flowscenario, the turbulent flow field is deliberately decomposed in resolved andunresolved flows by the application of different filters in space correspondingto different grid resolution. The behavior of turbulence models can be reproducedfrom the resolved flow and compared to the turbulent stress tensor directlycalculated from the unresolved part of the flow field. Starting from the RANSlimit, turbulence models with different levels of complexity are studied.Successively, the performance of these models is analyzed at intermediatenumerical resolutions between RANS, LES, and DNS. Finally, an improvedformulation of the Flow Simulation Methodology (FSM) is proposed.

No description available.

Baigiamajame magistro darbe analizuotos skirtingi liaunų atraminių sienų įrengimo variantai. Joms sumodeliuot ir paskaičiuot panaudota Prosheet ir GEO4 programos. Analizuojamos atraminės sienos, įrengtos smėliuose, kurių vidinės trinties kampas φ = 30 , sankabumas c = 0 kPa, ir moliuose, kurių vidinės trinties kampas φ = 26 , sankabumas c = 15 kPa. Skaičiavimų rezultatų lentelėse pateiktos įražų reikšmės ir skirtumai pavaizduoti grafiškai. Taip pat buvo išanalizuota, polių ilgiai, kuriuos suskaičiuoja kiekviena programa ir pavaizduota grafiškai. Išnagrinėjus, dėl ko gaunami skirtingi rezultatai, pateikiamos baigiamojo darbo išvados. Darbą sudaro 7 dalys: įvadas, 4 teorinės dalys, penktoji dalis - skaičiavimų rezultatai, išvados, literatūros sąrašas. Darbo apimtis – 63 p. teksto be priedų, 72 p. skaičiavimų rezultatų, 89 iliustr., 28 lent. Atskirai pridedami darbo priedai: 1 priedas 168 p. ir 2 priedas 168 p.. Priedai yra projektavimo programų atskirų variantų rezultatai, 3 priedas – paruoštas straipsnis vienuoliktai Lietuvos jaunųjų mokslininkų konferencijai bei pažyma apie straipsnio priėmimą spausdinimui. / In the master thesis it was analysed different method of retaining walls contruction. Prosheet and GEO4 programs werw used for calculation and design. Retaining walls were constructed in sandy soil or in clay. Properties of sand: angle of internal friction φ = 30 , cohesion c = 0 kPa. Properties of clayer soil: φ = 26 , c = 15 kPa. The stress values are given in the tables and differences showen graphically. Lengths of piles calculated are using each programme were analyzed and given graphically. After analysis of results, there were formulated an conclusion. Thesis consist of 7 chapters: introduction, 4 theoretical chapter, results of calculations, conclusions and references. Thesis consist of 63 text pages, 73 pages of calculations, including 89 illustrations and 28 tables. In addition 3 annexes are attached. Two of them are calculations and an article in the Young scientists conference.

Naudojamų hidrotechnikos statinių konstrukcijos veikiamos įvairių apkrovų ir neigiamo aplinkos poveikio nudėvimos, susiformuoja pažaidos. Pavojingiausios pažaidos, mažinančios pagrindinių laikančiųjų konstrukcijų (atraminių sienų) laikančiąją galią. Netekus laikomosios galios kyla grėsmė viso hidrotechnikos statinio patikimumui ir ilgaamžiškumui. Darbo tikslas – įvertinti hidromazgų atraminių sienų betono paviršinio sluoksnio ilgaamžiškumą apibrėžiančius rodiklius. Atlikus tyrimus nustatyta pagrindinė gelžbetoninių atraminių sienų charakteristika – betono gniuždomasis stipris. Pagal stiprio tyrimo rezultatus įvertintas Gailiušių hidromazgo atraminės sienos patikimumas ir nustatyta, kuris betono apsauginio sluoksnio ilgaamžiškumo rodiklis tiksliausiai atspindi atraminių sienų ilgaamžiškumo skaičiavimo rezultatus. Siūloma ilgaamžiškumo vertinimui naudoti 3.11 formulę. / Constructions of hydraulic structures are under the influence of different loads and negative environment impacts. Due to environmental impacts some deteriorations on the walls take place. The most dangerous kind of deteriorations reduces the bearing capacity of main constructions. The loss of the bearing capacity is very dangerous for the reliability and durability of the retaining wall. The purpose of this paper is to evaluate indicies defining the durability of the concrete covering layer of the retaining walls of hydroschemes. After the analysis it was found out the main characteristics of the reinforced concrete retaining walls – the compression strength of the concrete. The reliability of the retaining walls of Gailiušių hydroscheme was evaluated using the compression strength analysis. It was found out which indicator of the concrete covering layer durability gives the most correct counting results. It is suggested to use formula 3.11 for evaluation of durability.

If radiation plays an important role in many engineering applications, especially in those including combustion systems, influence of radiation on turbulent flows, particularly on the turbulent boundary layers, is still not well known. The objective is here to perform a detailed study of radiation effect on turbulent flows. An optimized emission-based reciprocal (OERM) approach of the Monte-Carlo method is proposed for radiation simulation using the CK model for radiative gas properties. OERM allows the uncertainty of results to be locally controlled while it overcomes the drawback of the original emission-based reciprocity approach by introducing a new frequency distribution function that is based on the maximum temperature of the domain. Direct Numerical Simulation (DNS) has been performed for turbulent channel flows under different pressure, wall temperatures and wall emissivity conditions. Flow field DNS simulations are fully coupled with radiation simulation using the OERM approach. The role of radiation on the mean temperature field and fluctuation field are analyzed in details. Modification of the mean temperature profile leads to changes in wall conductive heat fluxes and new wall laws for temperature when radiation is accounted for. The influence on temperature fluctuations and the turbulent heat flux is investigated through their respective transport equations whose balance is modified by radiation. A new wall-scaling based on the energy balance is proposed to improve collapsing of wall-normal turbulent flux profiles among different channel flows with/without considering radiation transfer. This scaling enables a new turbulent Prandtl number model to be introduced to take into account the effects of radiation. In order to consider the influence of radiation in the near-wall region and predict the modified wall law, a one-dimensional wall model for Large Eddy Simulation (LES) is proposed. The 1D turbulent equilibrium boundary layer equations are solved on an embedded grid in the inner layer. The obtained wall friction stress and wall conductive flux are then fed back to the LES solver. The radiative power term in the energy equation of the 1D wall model is computed from an analytical model. The proposed wall model is validated by a comparison with the former DNS/Monte-Carlo results. Finally, two criteria are proposed and validated. The first one is aimed to predict the importance of wall radiative heat flux while the other one predicts whether a wall model accounting for radiation in the near wall region is necessary. A parametric study is then performed where a k-ǫ model and a turbulent Prandtl number model are applied to simulate the velocity and temperature field of different channel flows under various flow conditions. The obtained criteria values are analyzed and compared.

A hydrate plugging and formation model for oil and gas pipelines is becoming increasingly important as producers continue to push flow assurance boundaries. A key input for any hydrate plugging model is the rate of hydrate growth and the volume fraction of hydrate at a given time. This work investigates a fundamental approach toward predicting hydrate growth and volume fraction in a water saturated gas pipeline. This works suggests that, in the absence of free water, hydrate volume fraction can be predicted using a wall growth and sloughing model. Wall growth can be predicted using a one-dimensional, moving boundary, heat and mass transfer model. It is hypothesized that hydrate sloughing can be predicted when a coincident frequency exists between hydrate natural frequency and flow induced vibrations over the hydrate surface.