Understanding real estate markets with big data: liquidity and rental co-movements in Germany

Market liquidity conditions and rental growth are said to match along “hot” and “cold” market cycles over time. Substantial deviations from these phases explain either overrented or underrented expectations by landlords or an essential change in tenants’ housing demand. While the assessment of housing markets by central banks, governments,...

The Impact of Misvaluation in the REIT Sector

By using the decomposing market-to-book model and the residual income model to estimate misvaluation, we find empirical evidence supporting the proposition that misvaluation has an impact on the financing decisions and liquidity management of REITs. Regarding the financing decisions, REITs experiencing a high increase in their stock prices will...

The Discount to NAV of distressed German open-ended real estate funds

The German open-ended real estate fund industry was strongly hit by massive out flows in the course of the global financial crisis. In total, 18 public and institutional real estate funds had to stop the redemption of shares and were ultimately forced to liquidate their portfolios. Investors of these funds either have to await the stepwise...

Injecting a liquid bacteria-based repair system to make porous network concrete healed

Bacteria induced calcite precipitation has been proven to be effective in making concrete structure self-healing. In Microlab TU Delft, the concept has been enhanced by developing a liquid bacteria-based concrete repair system. The solution contains calcite precipitating bacteria, nutrients and buffer compound which may demonstrate high...

Most recent advances in the field of self-healing cementitious materials

While the Japanese researchers Ohama et al. [1] already mentioned in 1992 that a self-healing effect was noticed when polymer-modified concrete without hardener was made, the real pioneer in the research on self-healing concrete is Carolyn Dry from Illinois. The first time she proposed the use of encapsulated polymers to obtain self-healing...

The numerical simulation of liquid sloshing in microgravity

With the increasing amount of liquid on board spacecraft, liquid management and its influence on the overall spacecraft dynamics is becoming increasingly important. The influence of sloshing liquid may hamper critical manoeuvres in space, such as the docking of liquid-cargo vehicles (e.g. to ISS) or the pointing of observational satellites....

CFD analysis of flow in the solid propellant start system of a liquid propellant engine

Starters are mechanisms that are used for generating the working fluid for initial rotation of LPE (Liquid Propellant Engines) turbopumps. The function of the start system is preparation of initial power for starting a turbine. This turbine is attached to the fuel and oxidizer pumps. When these pumps work in a suitable case, the required power...

Simulation of the internal ballistics of a liquid propellant engine start system in comparison with experimental verification

There are several methods for starting a complex mechanical system, for example a liquid propellant engine. One of common methods is the use of solid propellant gas generator that is named solid propellant starter. In this method, a solid propellant motor is used for gas generating and leading it towards power generation turbine. The turbine as...

Simulation of NAPL vertical infiltration in a heterogeneous soil

The research deals with simulation of contaminant infiltration and spreading in soils. The problem has substantial ecological sense to predict possible contamination of the soil air and the groundwater. As contaminants, for example, mineral fuels, solvents and detergents (in other words Non-Aqueous Phase Liquids - NAPLs) can be considered. These...

Investigation of the effect of two-components injectors arrangement on injecting rate in the combustion chamber of a liquid propellant engine

In liquid propellant engines, the propellants (fuel and oxidizer) after passing the injectors, are injected to combustion chamber. Generally, in liquid propellant engines, two types of injectors - direct flow and centrifugal flow - are used. The direct flow injector, actuates as an orifice. The input flow to a centrifugal injector, gets the...