DaKS - University of Kassel's research data repository

DaKS is the institutional repository of the University of Kassel for research data. It offers structured storage of research data alongside with descriptive metadata, long-term archiving for at least 10 years and – if requested – the publication of the dataset with a DOI.

DaKS is managed by the university library and the IT Service Centre of the University of Kassel. It is hosted at Philipps-Universität Marburg. We are happy to advise you via daks@uni-kassel.de.

Recent Submissions

Research Data

Investigation of Synergistic Effects of UV Radiation and Elevated Temperatures on Regenerated Cellulose Fiber-Reinforced Bio-Polyamide 5.10 Composites and the Contribution of UV Stabilizers to their Stability [Dataset]

(Universität Kassel) Falkenreck, Celia Katharina; Zarges, Jan-Christoph; Heim, Hans-Peter

This study investigates the thermo- and photo-oxidative degradation behavior of a bio-based polyamide (PA) 5.10, both neat and 20 wt.% regenerated cellulose fiber-reinforced (RCF). In addition, these materials were modified with two different UV stabilizers, AddWorks IBC760 (IBC), a hindered amine light stabilizer, and LUBIO UV16 (LUBIO), an UV absorber. 168 hours of storage at temperatures of 23 °C, 50 °C, 70 °C to 90 °C at 50 %rH, with and without UV exposure of 1000 W/m², revealed significant degradation effects both in neat and LUBIO-stabilized batches, including molecular chain splitting processes, embrittlement, reduction in surface polarity and pronounced yellowing. In contrast, the IBC provided superior stabilization, maintaining thermal and mechanical properties as well as color stability. RCF-reinforced PA 5.10 exhibited moisture-induced plasticization, increasing ductility as well as aging-induced embrittlement at elevated temperatures. SEM imaging confirmed an increased share of fiber ruptures in the UV exposed neat RCF-composites, while IBC-stabilized specimens preserved the high amount of fiber pull-outs. Melt volume rate measurements demonstrate the reduction in molecular weight due to the thermo- and photo-oxidative degradation. A linear polynomial regression was also used to demonstrate the characteristic degradation mechanisms of polyamide. Overall, the IBC-stabilized batches show a significant stabilization effect across all tested storage conditions. These findings highlight the potential of UV-stabilized RCF-reinforced PA 5.10 composites as sustainable replacements for petro-based polyamide composites in applications requiring long-term resistance to thermo- and photo-oxidative stress.

This data set consists of the measured data from the conducted experiments as well as the data analysis.
In case you use the data please cite the corresponding article. The corresponding publication is currently in publication process.

Research Data

The Strapkhor, the Jinn, and the Clever Old Woman

(Universität Kassel, 2024-05-31) Syed Muhammad Ali Shah; Andreas Bürkert; Martin Wiehle; Eva Schlecht; Ellen Hoffmann

This tale, over 400 years old, has been passed down through generations in our family. We heard it from our great-grandfather, and it continues to be shared as a piece of our rich cultural heritage. In ancient times, humans coexisted with jinns. The advent of machinery, trains, airplanes, and cars marked the end of this era. Back then, populations were sparse, and houses were far apart, often one or two miles apart. Consequently, the entire region of Baltistan was inhabited by jinns. My great-grandfather used to tell us stories about jinns visiting our homes. One such tale involves a traditional dish called strapkhor, unique to Baltistan and possibly not found anywhere else in the world. The preparation of strapkhor is a lengthy process. First, wheat grains are soaked in water for several days until they sprout. The sprouted wheat is then dried in the sun. Once dried, it develops a distinct flavor, ready to be used in making strapkhor. One day, an old woman was making strapkhor on an iron stove. Due to the scarcity of wood, they often used various weeds collected from pastures as fuel. While she was cooking, a woman who appeared to be a human entered the kitchen and offered her help. As the old woman placed the dough on the griddle, it kept disappearing mysteriously. The wise old woman quickly realized that her helper was not human but a fairy or a jinn. She cleverly asked the fairy to blow on the stove, claiming it wasn't burning properly. As the fairy bent down to blow on the stove, the old woman swiftly pushed her head into the red-hot iron stove. The fairy screamed and, instead of fleeing through the door, escaped through the stove's hood. Outside, another jinn was waiting for her. Seeing her condition, the waiting jinn spoke in their language, instructing her to invert her body "“ head down and feet up. When she did so, the iron rod stuck in her neck fell out. This encounter revealed to the old woman that the being was indeed a jinn. She noticed that the jinn had inverted feet and hair under their soles.

Research Data

The Bird and the Pearl

(Universität Kassel, 2024-08-22) Gamburi; Andreas Bürkert; Martin Wiehle; Eva Schlecht; Ellen Hoffmann

Once upon a time there was a bird that had a thread adorned with pearls. One day, a pearl fell from the thread and got stuck in a thorn. The bird asked the thorn to return the pearl, but the thorn refused. The bird then asked the fire to burn the thorn, but the fire declined. So, the bird asked the water to quench the fire, but the water also refused. Next, the bird approached a bull, asking it to drink the water. The bull questioned why it should comply after which the bird asked a man to shoot the bull with his gun. The man, too, asked why he should do that. Undeterred, the bird asked a rat to destroy the man's bullets, but the rat refused. So, the bird turned to a cat, asking it to eat the rat. The cat wondered why it should do such a thing and finally, the bird asked a grandmother to kill the cat. The grandmother, questioning the request, pointed out that the cat took care of the house. The bird then asked the wind to blow and destroy the grandmother's house. A loud sound was heard as the wind blew and scat-tered the grandmother's belongings. Furious, the grandmother killed the cat and the cat then ate the rat. The rat destroyed the man's bullets, the man shot the bull, the bull drank the water, the water quenched the fire, the fire burned the thorn and finally, the thorn returned the pearl to the bird. Thus, through a series of events, the bird recovered its precious pearl.

Research Data

The Enchanted Magician

(Universität Kassel, 2024-05-31) Gulam Nabi; Andreas Bürkert; Martin Wiehle; Eva Schlecht; Ellen Hoffmann

Ghulam Nabi, a policeman, had a deep desire to learn magic. The type of magic he sought required practice at night, so he exchanged his night duties with his colleagues. For forty days, he stayed awake at night and performed his duties during the day. This forty-day magic course was called chila. On the fortieth night, he experienced strange phenomena: the earth shook as if from an earthquake, and a massive amount of water seemed to rush towards him. His night was filled with fear, and he recited verses from the Holy Qur'an for comfort. In the early morning, Ghulam Nabi went to his teacher and described the terrifying night he had experienced. The teacher congratulated him, explaining that he had successfully become a real magician. He was warned that those who failed to complete the course could not live normal lives. In celebration, the teacher offered him a cup of tea. After mastering this magic, Ghulam Nabi found he could cure certain diseases simply by touching his saliva to the afflicted area. Although his powers diminished with age, his blessing or influence huda remained effective. He understood that there were four types of magic: black, white, separating, and vision magic"”the latter being the most dangerous. Once, his niece was affected by vision magic, but thanks to his knowledge, she recovered. He noted that his powers were especially strong on Fridays, attracting people from across the region seeking his help on that day. Ghulam Nabi also got to know a man from Mansehra who exhibited strange symptoms, such as itching that released leeches which then vanished into the air. He used his magical powers to fully cure the man, as well as his uncle who showed similar symptoms. In gratitude, they gave him a vehicle full of fruits. He also experienced another case with a young boy in the village who started behaving unusually, taking off his clothes and shoes, and trying to run away. The boy repeatedly said he wanted to go to Astore, but his worried parents brought him to Ghulam Nabi, who used his magical skills to treat the boy. After that the boy served in the army, a testament to Ghulam Nabi's enduring magical abilities.

Research Data

The Falling Stones of Choshkong (Raja's Water Channel)

(Universität Kassel, 2024-06-07) Dr. Hasan Khan Amacha; Andreas Bürkert; Martin Wiehle; Eva Schlecht; Ellen Hoffmann

The fourth tale is about the royal family of Shigar and a stream called Choshkong (Raja Sahib's Water Channel). When a member of Raja Sahib's family, especially a man, passed away, stones fell from above into this water channel. This tradition has been famous for a long time. The last elder in our royal family was Raja Muhammad Ali Shah Sahib, who passed away three years ago. On the evening he died, and the next morning, when I reached my house's steps for the funeral prayers, two stones fell. I heard the sound of falling stones and when I reached the door, stones fell again. I could see stones falling and dust rising. Whether you call it a myth or reality, this event is well-known among the people here.