Composite column tests - database and comparison with Eurocode 4

[EN] The database of 1819 tests on concrete-filled steel tube columns was reported in 2008 [1,2] and covered all tests traced by the author up to 2007. This paper reports on 473 more tests carried out by 26 researchers between 2007 and 2017. These have been divided into short and long circular section columns, rectangular section columns, and also into those subjected to axial load and those with an eccentric load (causing an end moment), and collected into a new database. The results are compared with the provisions of Eurocode 4 (EC4) and show the overall average ratio of Test failure load to EC4 prediction for these 473 tests is 1.10. Eurocode 4 is thus a very reasonable predictor of the failure load and can be used with confidence to design composite columns. The detailed data can be accessed on the ‘web’, which also contains references to the 51 papers from which the data has been extracted; it will be of use to researchers of composite columns who wish to compare any theoretical analysis they produce with test data.Goode, C. (2018). Composite column tests - database and comparison with Eurocode 4. En Proceedings of the 12th International Conference on Advances in Steel-Concrete Composite Structures. ASCCS 2018. Editorial Universitat Politècnica de València. 763-767. https://doi.org/10.4995/ASCCS2018.2018.7067OCS76376

Cylinders with a steel-concrete-steel wall to resist external pressure

[EN] In the 1980’s Manchester University carried out over 110 tests on cylinders with a composite wall (steel-concrete-steel) subjected to external pressure as already reported in the literature. This paper describes further tests on 9 cylinders with a composite wall and a dome end subjected to external pressure and reports the results and compares them with theory. The cylinders were 500 mm diameter and 1250 mm long and four of them had penetrations through the cylinder wall. These tests were carried out under contract for Tecnomare SpA of Italy and have not been previously reported because of confidentiality reasons. The agreement between test behaviour, failure load and the theory developed at Manchester University is good. The philosophy for the design of such vessels for seabed structures is discussed and a ‘depth margin’ method proposed as it is a more realistic way of applying safety. Examples of designs for different depths are given and compared with the predicted failure pressure.Tecnomare SpA of Italy is thanked for providing the financial support for this work. The tests were carried out at Manchester University by Dr. Tom Nash, John Smith & Alan Graham under the direction of the late Professor Peter Montague.Goode, C.; Nash, T. (2018). Cylinders with a steel-concrete-steel wall to resist external pressure. En Proceedings of the 12th International Conference on Advances in Steel-Concrete Composite Structures. ASCCS 2018. Editorial Universitat Politècnica de València. 647-652. https://doi.org/10.4995/ASCCS2018.2018.7066OCS64765

The relationship between the green belt, England’s housing crisis and the planning system

The Green Belt is probably England’s most popular and longstanding planning policy commanding widespread political support locally and nationally yet it is regularly critiqued as one of the main causes of England’s Housing Crisis by academics, think tanks and housebuilders. More broadly, following Hall’s seminal work The Containment of Urban England (1973), it is often argued that it contributes to wider inequitable outcomes in the planning system, which is disproportionately skewed in favour of campaigners and homeowners. This thesis critically evaluates the extent to which the Green Belt contributes to the housing crisis and whether the policy needs reforming. The broader question of power in planning is addressed through exploring why and how the public and campaigners support the Green Belt and oppose housebuilding generally. It therefore aims to add nuance to, and move forward the often polarised Green Belt debate by focusing principally on the views of planners, which are often under-represented in the Green Belt debate, despite being the main actor in the planning system. The study focuses on the importance of space through a geographically based case study of the West Midlands. The thesis finds that the housing crisis is a complex, multi-faceted problem consisting of multi-scalar factors although the Green Belt exacerbates the crisis in particular locations, especially on the edge of conurbations. It argues that the policy should not be abolished but modified for the 21st century with a focus on sustainability, especially recreation and environmental improvement, and that there should be national conversation on the policy’s overall spatial extent and purpose, perhaps as part of a national plan. The study also finds that people primarily support the policy because of popular planning principles and place attachment rather than house prices. There is a gap between the attempted exercises of power and effective power of campaigners with significant circumscription and modulation of power in the planning system. Finally, many of the issues associated with the Green Belt and community opposition to development generally are related to the lack of strategic planning in the current system so the thesis underlines the need for integrated, strategic planning to protect the environment and meet housing need

Structure formation in the Lemaitre-Tolman model

Structure formation within the Lemaitre-Tolman model is investigated in a general manner. We seek models such that the initial density perturbation within a homogeneous background has a smaller mass than the structure into which it will develop, and the perturbation then accretes more mass during evolution. This is a generalisation of the approach taken by Bonnor in 1956. It is proved that any two spherically symmetric density profiles specified on any two constant time slices can be joined by a Lemaitre-Tolman evolution, and exact implicit formulae for the arbitrary functions that determine the resulting L-T model are obtained. Examples of the process are investigated numerically.Comment: LaTeX 2e plus 14 .eps & .ps figure files. 33 pages including figures. Minor revisions of text and data make it more precise and consistent. Currently scheduled for Phys Rev D vol 64, December 15 issu

Very Shallow Water Bathymetry Retrieval from Hyperspectral Imagery at the Virginia Coast Reserve (VCR\u2707) Multi-Sensor Campaign

A number of institutions, including the Naval Research Laboratory (NRL), have developed look up tables for remote retrieval of bathymetry and in-water optical properties from hyperspectral imagery (HSI) [6]. For bathymetry retrieval, the lower limit is the very shallow water case (here defined as \u3c 2m), a depth zone which is not well resolved by many existing bathymetric LIDAR sensors, such as SHOALS [4]. The ability to rapidly model these shallow water depths from HSI directly has potential benefits for combined HSI/LIDAR systems such as the Compact Hydrographic Airborne Rapid Total Survey (CHARTS) [10]. In this study, we focused on the validation of a near infra-red feature, corresponding to a local minimum in absorption (and therefore a local peak in reflectance), which can be correlated directly to bathymetry with a high degree of confidence. Compared to other VNIR wavelengths, this particular near-IR feature corresponds to a peak in the correlation with depth in this very shallow water regime, and this is a spectral range where reflectance depends primarily on water depth (water absorption) and bottom type, with suspended constituents playing a secondary role

Adenomatoid tumors of the male and female genital tract are defined by TRAF7 mutations that drive aberrant NF-kB pathway activation.

Adenomatoid tumors are the most common neoplasm of the epididymis, and histologically similar adenomatoid tumors also commonly arise in the uterus and fallopian tube. To investigate the molecular pathogenesis of these tumors, we performed genomic profiling on a cohort of 31 adenomatoid tumors of the male and female genital tracts. We identified that all tumors harbored somatic missense mutations in the TRAF7 gene, which encodes an E3 ubiquitin ligase belonging to the family of tumor necrosis factor receptor-associated factors (TRAFs). These mutations all clustered into one of five recurrent hotspots within the WD40 repeat domains at the C-terminus of the protein. Functional studies in vitro revealed that expression of mutant but not wild-type TRAF7 led to increased phosphorylation of nuclear factor-kappa B (NF-kB) and increased expression of L1 cell adhesion molecule (L1CAM), a marker of NF-kB pathway activation. Immunohistochemistry demonstrated robust L1CAM expression in adenomatoid tumors that was absent in normal mesothelial cells, malignant peritoneal mesotheliomas and multilocular peritoneal inclusion cysts. Together, these studies demonstrate that adenomatoid tumors of the male and female genital tract are genetically defined by TRAF7 mutation that drives aberrant NF-kB pathway activation

Turbo Expanders & PRTs

Discussion GroupSuggested Topics: Group Input - Topics from attendees Turbo Expanders - High temperature corrosion Design Tools Process Recovery Machines Isokinetic Testing - Result accuracy Dehydration Units Pipeline Recovery Turbines Nitric Acid Trains Turbo Expanders - new technologies Hot Seals - Whats working Abrasive Cleaning Inlet Temperature Measurement - Skin/ Nosecone Performance Monitoring Tip rubs Recovery Units - Package