Development of underwater housings for the deep sea made of ultra-high performance concrete (UHPC) and long-term testing at the Arctic Sea
The aim of this research is the design and analysis of underwater housings made of ultra-high performance concrete (UHPC) within the Helmholtz Alliance “ROBEX” (robotic exploration of extreme environments) [1]. Due to the extremely corrosive maritime environment, mainly expensive materials such as titanium, ceramics, special stainless steel and aluminum are used so far for the construction of temporary and permanent research stations to guarantee long-term deployment. In this project the suitability of high-strength concrete with compressive strength up to 210 MPa for underwater pressure housings and constructions is examined to provide a low cost and durable alternative especially for large housings in future.
Sealing systems for low-cost and corrosion-free pressure housings made of ultra-high performance concrete (UHPC)
The article is about the development of a sealing system for pressure housings made of ultra-high performance concrete (UHPC), which has been developed within the Helmholtz Alliance “ROBEX” (robotic exploration of extreme environments) [1]. Several kinds of sealing systems according to the material properties of concrete have been designed so far and the amount of aluminum or titanium needed has been continuously reduced to minimize the manufacturing costs. Also a new metal-free sealing based on epoxy has been designed. The developed sealing systems made of aluminum, titanium or epoxies have been tested experimentally in pressure tanks in-situ. The sealing systems also have been simulated numerically with ANSYS 16 and the nonlinear material law multiPlas law 14 (Menetrey-Willam) by Dynardo. Advantages and disadvantages of these systems are shown in the paper.
The Problems and Opportunities in Developing International Business Programs
This paper discusses the results of a survey conducted among AACSB member schools. The survey dealt with two major topical areas. These were (a) what types of International Business programs currently exist in AACSB Schools, and (b) problems associated with these programs. The paper also suggests countries that offer opportunities to Colleges of Business to pursue countty-specific programs.