© HZB/K. Haas (alle Fotos)
They are back: Sheep and goats graze the Wannsee campus again
The meadows are lush green, the ice saints (almost) over: Now is the perfect time for the sheep and goats to return from their winter quarters! Until late autumn, they will now graze the near-natural HZB campus in Wannsee and serve the natural preservation of the landscape - completely without a lawn mower.
The meadows are lush green, the ice saints (almost) over: Now is the perfect time for the sheep and goats to return from their winter quarters! Until late autumn, they will now graze the near-natural HZB campus in Wannsee and serve the natural preservation of the landscape - completely without a lawn mower.
On 14 May 2020, shepherd Olaf Kolecki brought his "protégé" back to the Wannsee campus. Among them are five sheep (4 white Skudden and one black Skudden-Pomeranian Landschaf crossbreed, five lambs (3 white Skudden lambs and 2 black lambs, mother is the crossbreed) and five goats (2 Boer goats, the brown and the brown-white and three goat lambs).
Since goats and sheep have different food preferences, this mixture is just right for maintaining the green areas. The grazing is particularly insect-friendly and contributes to increasing the biodiversity of the wild meadows. And also many employees have grown fond of the animals over the past year and have missed the bleating on the campus a little bit in the last weeks.
In an interview (GER) last year the shepherd answered many questions about his work.
Before the arrival of the sheep and goats, the fenced-in eastern area in Wannsee was still being cleaned up. At the beginning of the year the old meadow orchard was "revived". For this purpose, sheds were torn down and some trees were felled to give the old fruit trees more light again. The wood of the felled trees was piled up in several deadwood heaps. This has created an important habitat and refuge for insects and small animals.
Sustainability at HZB on the Intranet
The HZB is intensively engaged in sustainable action and research. An overview of the topics and measures can be found on the newly designed intranet pages on sustainability (GER).
- MXene for energy storage: More versatile than expectedMXene materials are promising candidates for a new energy storage technology. However, the processes by which the charge storage takes place were not yet fully understood. A team at HZB has examined, for the first time, individual MXene flakes to explore these processes in detail. Using the in situ Scanning transmission X-ray microscope 'MYSTIIC' at BESSY II, the scientists mapped the chemical states of Titanium atoms on the MXene flake surfaces. The results revealed two distinct redox reactions, depending on the electrolyte. This lays the groundwork for understanding charge transfer processes at the nanoscale and provides a basis for future research aimed at optimising pseudocapacitive energy storage devices.
- Compact electron accelerator for treating PFAS-contaminated waterSo-called forever chemicals or PFAS compounds are a growing environmental problem. An innovative approach to treating PFAS-contaminated water and soil now comes from accelerator physics: high-energy electrons can break down PFAS molecules into harmless components through a process called radiolysis. A recent study published in PLOS One shows that an accelerator developed at HZB, based on a SRF photoinjector, can provide the necessary electron beam.
- Bright prospects for tin perovskite solar cellsPerovskite solar cells are widely regarded as the next generation photovoltaic technology. However, they are not yet stable enough in the long term for widespread commercial use. One reason for this is migrating ions, which cause degradation of the semiconducting material over time. A team from HZB and the University of Potsdam has now investigated the ion density in four different, widely used perovskite compounds and discovered significant differences. Tin perovskite semiconductors produced with an alternative solvent had a particular low ion density — only one tenth that of lead perovskite semiconductors. This suggests that tin-based perovskites could be used to make solar cells that are not only really environmentally friendly but also very stable.