1,055 research outputs found
Soil and foundation stability improvement by stone column: A case study in Adapazari city, Turkey
No full textAdapazari city is located on a very deep alluvial deposit and in a seismically active region. Due to the catastrophic earthquakes, the region had painful experiences in the past. The latest severe earthquake, called Marmara earthquake, hit the region on August 17, 1999. It resulted in nearly 4.000 deaths, over 5,000 injuries and totally destroyed more than 29,000 buildings. The region has liquefaction potential due to its geological set up. Most of the structures built on the liquefiable soil severely settled or tilted besides the structural damages. To re-accommodate these structures, it is necessary to strengthen them besides improve their ground conditions. Then, it may be possible to avoid probable damages caused by liquefaction and use them again safely. In this study, application of modified dry bottom feed stone column as one of the dominant ground improvement methods in the region was introduced. Also, a numerical analysis is carried out to check its performance with respect to displacements. According to numerical results, significant improvements were obtained in terms of displacements
Herb Wharton, Aboriginal stockman and author, Mount Isa, Queensland, 1994 /
No full textTitle devised by cataloguer from information provided by photographer.; Part of: Cattle Camp series of portraits of Aboriginal drovers, Mount Isa, Queensland, 1994.; Mode of access: Online
Parametric Investigation of Corner Effect on Soil Nailed Walls and Prediction Using Machine Learning Methods
No full textThe performance of soil nailed walls is evaluated based on lateral displacements, especially in high walls. In this study, the displacement behavior of nailed walls, which are frequently preferred in retaining wall systems in hard clayey soils, was examined by taking into account the corner effect. The nailed wall model was created using Plaxis 2D v.23, and the performance of the model was verified with the results of inclinometer measurements taken on-site. To assess the influence of excavation pit dimensions on the corner effect, 25 three-dimensional and 25 plane–strain slice models were created using Plaxis 3D v.23, and the effect of excavation pit dimensions on the plane–strain ratio (PSR) was determined. Then, analysis studies were carried out by creating 336 3D and 336 plane–strain slice models with variable parameters, such as slope angle (β), wall angle (α), nail length (L/H), excavation depth (H), and distance from the corner (xH). Its effects on PSR were determined. The interactions of the parameters with each other and PSR estimation were evaluated using machine learning (ML) methods: artificial neural networks (ANN), classifical and regression tree (CART), support vector regression (SVR), extreme gradient boosting (XGBoost). The proposed ML prediction methods and PSR results were compared with performance metrics and reliable results were obtained
Car drivers’ preferences for ISA policy measures
No full textIntelligent Speed Adaptation (ISA), an in-vehicle system that can either warn the driver or directly limit the vehicle’s speed when the speed limit is reached, is generally believed to have a large potential to increase road safety. However, policy makers hesitate to take policy measures that may increase ISA use. Public acceptance of ISA or policy makers’ perception of it is regarded to play an important role in this. This paper aims to increase this insight by reporting car drivers’ preferences for ISA policy measures based on stated choice experiment conducted in the Netherlands. Respondents made choices between various implementation strategies (mandatory ISA and voluntary ISA with financial incentives) given a chosen policy measure. The policy measure describes which drivers group (speed offenders, professional drivers or all drivers) is targeted and which ISA type (warning or limiting) is stimulated. The results point out that car drivers especially prefer that policy makers would impose ISA on speed offenders and to a lesser extent also on professional drivers, while they prefer a voluntary ISA for themselves. Use of voluntary ISA can be stimulated by offering financial incentives, of which purchase subsidy is preferred above annual tax cuts. Furthermore, car drivers prefer warning ISA for themselves and also for professional drivers, while they prefer limiting ISA for speed offenders. In addition, the results indicate that females and the older age group prefer ISA policy measures more than males and young drivers, but overall car drivers’ preferences seem to be rather homogeneous.Engineering, Systems and ServicesTechnology, Policy and Managemen
Tünel inşa edilmiş sıvılaşabilir zeminlerdeki yer değiştirmelerin sayısal analizlerle incelenmesi
No full textThe rise in industrialization and population has led to an increase in the economic significance of existing urban areas, and thus the utilization of underground space has become quite remarkable It is an undeniable fact that in seismically active regions, the underground areas are also exposed to the risk of earthquakes. The devastating 1995 Kobe-Japan, 1999 Chi-Chi-Taiwan and 1999 Kocaeli-Turkey earthquakes are known to have caused major damage to existing underground structures. In this study, numerical models based on finite differences in FLAC 2D were established to evaluate the displacements of the ground around the tunnels located in liquefiable soils. In order to represent the liquefaction condition in the models, soils in the Adapazarı region, which have alluvial characteristics, were used. Soil deformations were examined in models with varying tunnel depths and diameters, for both liquefiable and non-liquefiable soils within the same layers. As a result of this study, it is stated that more stability losses are observed in analyzes where liquefaction can be defined - that is, changes in pore water pressures can be modeled - compared to analyzes without liquefaction. The layout of the ground layers is important for the positioning of the tunnel. The placement of the tunnel towards the solid layers caused the deformations to decrease.Sanayileşme ve nüfustaki artış, mevcut kentsel alanların ekonomik öneminin artmasına yol açmış ve böylece yeraltı alanlarının kullanımı oldukça dikkat çekici hale gelmiştir. Sismik açıdan aktif bölgelerde yeraltı alanlarının da deprem riskine maruz kaldığı yadsınamaz bir gerçektir. Yıkıcı 1995 Kobe-Japonya, 1999 Chi-Chi-Tayvan ve 1999 Kocaeli-Türkiye depremlerinin mevcut yeraltı yapılarında büyük hasara neden olduğu bilinmektedir. Bu çalışmada, sıvılaşabilir zeminlerde bulunan tünellerin etrafındaki zeminin yer değiştirmelerini değerlendirmek için FLAC 2D'de sonlu farklara dayalı sayısal modeller kurulmuştur. Modellerde sıvılaşma durumunu temsil etmek için Adapazarı bölgesindeki alüvyon karakterli zeminler kullanılmıştır. Zemin deformasyonları, aynı katmanlardaki hem sıvılaşan hem de sıvılaşmayan zeminler için değişen tünel derinlikleri ve çaplarına sahip modellerde incelenmiştir. Bu çalışma sonucunda, sıvılaşmanın tanımlanabildiği, yani boşluk suyu basınçlarındaki değişimlerin modellenebildiği analizlerde, sıvılaşma olmayan analizlere göre daha fazla stabilite kaybı gözlendiği belirtilmektedir. Zemin katmanlarının yerleşimi, tünelin konumlandırılması için önemlidir. Tünelin sağlam katmanlara doğru yerleşmesi deformasyonların azalmasına neden olmuştur
A dual infection of infectious salmon anaemia (ISA) virus and a togavirus-like virus in ISA of Atlantic salmon Salmo salar in New Brunswick, Canada
No full textTwo viruses, infectious salmon anaemia (ISA) virus and a novel togavirus-like virus, were isolated from ISA disease outbreaks that were first reported as a new syndrome, haemorrhagic kidney syndrome (HKS) affecting farmed Atlantic salmon Salmo salar L. on the East coast of Canada. Laboratory confirmation of ISA diagnosis was initially complicated by isolation of only the togavirus-like agent using the CHSE-214 cell line. Here we demonstrate that a clinical sample from a disease outbreak of ISA contained a mixture of ISA virus and togavirus-like virus. Reverse transcriptase-polymerase chain reaction (RT-PCR) confirmed the presence of both viruses during serial passage of cultures in SHK-1 and CHSE-214 cells. Virus harvested at passage level 3 in both cell lines caused high mortalities and severe gross pathology consistent with ISA virus infection in experimentally inoculated Atlantic salmon parr (approximately 35 g) in freshwater, beginning 12 d post inoculation. ISA virus was detected by virus isolation from kidney and liver tissues of all dead or moribund fish tested. A comparison of virus isolation, 1-step procedure RT-PCR and RNA dot-blot hybridization for detection of ISA virus (ISAV) in fish tissues showed virus isolation to have 100% sensitivity, followed by RT-PCR (66 and 28% sensitivity in kidney and liver, respectively), with RNA dot-blot hybridization as the least sensitive method (20 and 10% sensitivity in kidney and liver, respectively). No togavirus-like virus was detected in these samples by virus isolation. Moreover, another togavirus-like virus isolate grown in CHSE-214 cells in the absence of any other detectable pathogen was non-pathogenic in experimentally inoculated fish. This study confirms that the original ISA outbreaks in New Brunswick, Canada, were caused solely by ISAV
Isa Lake on the Continental Divide, Yellowstone National Park.
No full textIsa Lake on the Continental Divide, Yellowstone National Park
Transition to ISA: Changes in Audit Documentation Practice
No full textTh e article considers the eff ects of transition to ISA in audit documenting. Th e author analyzes base audit documenting problems, existing before the transition to ISA, discloses ISA specifi c features, refl ected in the change of approach to audit documenting, explores the main results the transition to ISA in formation of auditor working papers.</jats:p
What drives the Acceptability of Intelligent Speed Assistance (ISA)?
No full textTo have knowledge about the acceptability of Intelligent Transport systems (ITS) is most beneficial for the development of supported implementation strategies. So far, different theories and methods, also stemming from other domains, have been used to define and conceptualize the notion of acceptability. In a previous paper, we developed a theoretical concept to define acceptability of ISA based on different theories and methods used in ITS & ISA research. In the current paper we aim to find out which predefined indicators are relevant to define the acceptability of ISA. Background factors, contextual issues and ISA-device related factors are used as indicators to predict the level of acceptability. Structural Equation Modelling (SEM) is used to define the direct and indirect effects.Infrastructures, Systems and ServicesTechnology, Policy and Managemen
GSQ Mt Isa Southwest elevation grid geodetic
No full textMaintenance and Update Frequency: notPlannedStatement: This GSQ Mt Isa Southwest elevation grid geodetic is elevation data for the Mount Isa South West, Qld, 2006 acquired under the project No. 1111 for the geological survey of QLD. The grid has a cell size of 0.00083 degrees (approximately 88m). This grid contains the ground elevation values relative to the geoid for the Mount Isa South West, Qld, 2006. It represents the vertical distance from a location on the Earth's surface to the geoid. The data are given in units of meters. The processed data are checked by GA geophysicists using standard methods for assessing quality to ensure that the final data are fit-for-purpose.Digital Elevation data record the terrain height variations from the processed point- or line-located data recorded during a geophysical survey. This GSQ Mt Isa Southwest elevation grid geodetic is elevation data for the Mount Isa South West, Qld, 2006. This survey was acquired under the project No. 1111 for the geological survey of QLD. The grid has a cell size of 0.00083 degrees (approximately 88m). This grid contains the ground elevation relative to the geoid for the Mount Isa South West, Qld, 2006. It represents the vertical distance from a location on the Earth's surface to the geoid. The data are given in units of meters. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose
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