Suche
Anzeige der Dokumente 921-930 von 1145
Aufsatz
Dissimilar Laser Beam Welding of Titanium to Stainless Steel Using Pure Niobium as Filler Material in Lap Joint Configuration
(2023-09-20)
In the present investigation, commercially pure titanium is welded to AISI 316L stainless steel by intermixing niobium as filler material in a lap joint configuration. For this purpose, a pulsed Nd:YAG laser with various pulse durations and pulse peak powers is employed to obtain different mixing conditions for the materials. It will be demonstrated that, despite the implementation of the filler material, the weld seams are characterized by a high affinity for cracking, which in turn can be attributed to the formation ...
Aufsatz
Human‑elephant conflict in the Sri Lankan dry zone: investigating social and geographical drivers through field‑based methods
(2023-07-02)
Human-elephant conflict (HEC) in Sri Lanka has escalated over the recent years, with, on average, 300 elephant deaths annually and human casualties of around 90 per year. Employing field-based qualitative methods, this contribution identifies causes and contexts of human-elephant conflict in those parts of the Sri Lankan dry zone most severely affected. We have used field observations as well as semi-structured interviews with experts and affected villagers as primary data collection techniques. The findings show ...
Aufsatz
Relevance of organic vs. inorganic nitrogen in intra- and interspecific competition of seven central European tree species
(2023-06-23)
Key message: When competing for nitrogen with other tree species, organic N is more important than inorganic N for most species. //
Abstract: Competition for nitrogen (N) in the rhizosphere is a key process regulating a seedling´s chances for growth and survival. However, only few studies have investigated this at the individual species´ level when using a community approach. In this study, ¹⁵N incubation experiments were conducted to quantify inorganic (i.e. ammonium and nitrate) and organic (i.e. glutamine-N and ...
Aufsatz
Challenges in detecting proximal effects of existential threat on lie detection accuracy
(2022-06-14)
The present work documents our investigation of proximal (i.e., immediate) effects of existential threat on the process of lie detection. Specifically, we hypothesized that lie detection accuracy will be higher in a mortality salience (MS) condition compared with the control condition. In two lab-based studies (N = 120; N = 109) and one internet study (N = 1294), we did not find any evidence for this hypothesis, that is, MS effects on lie detection accuracy were constantly not significant. However, these null findings ...
Aufsatz
Prioritizing strategies for wheat biofortification: Inspiration from underutilized species
(2023-10-05)
The relationship between malnutrition and climate change is still poorly understood but a comprehensive knowledge of their interactions is needed to address the global public health agenda. Limited studies have been conducted to propose robust and economic-friendly strategies to augment the food basket with underutilized species and biofortify the staples for nutritional security. Sea-buckthorn is a known “superfood” rich in vitamin C and iron content. It is found naturally in northern hemispherical temperate Eurasia ...
Aufsatz
Get the happiness out–An online experiment on the causal effects of positive emotions on giving
(2023-08-23)
Our study provides new evidence on the impact of positive emotions on voluntary contributions to public goods in a natural setting. Using a lab-in-field experiment, we induce positive incidental emotions randomly and analyze their effects on donations using a dictator game with multiple beneficiaries. Although we find no significant overall effect of positive incidental emotions on donation levels, our results show a significant shift in the allocation of donations towards the host charity. These findings shed light ...
Aufsatz
Wie kommen Tierlaute in einen Text?
(2023-08-07)
In der empirischen Tierforschung spielen Tierlaute eine entscheidende Rolle für die Zuschreibung geistiger Fähigkeiten. In diesem Zusammenhang werden die flüchtigen und einmaligen Lautereignisse tierlicher Vokalisation in wiederholt rezipierbare textuelle Zeichen transformiert und fixiert. Am Beispiel der Forschungen von Anne Marijke Schel et al. (2013a) zur Intentionalität von Schimpansen zeigt der Beitrag, wie die Sichtbarmachung von Lauten mit der Zuschreibung dieser geistigen Fähigkeiten einhergeht. Um dieses ...
Aufsatz
Agrarian change through speculation: Rural elites as land brokers for mining in Colombia
(2023-08-31)
This paper studies the connections between the expansion of mining capital, speculative forms of land grabbing and agrarian transformation. It is argued that in periods of commodity boom, the landowning rural elite benefits from mining through speculative land deals with mining companies. They act as ‘land brokers’ for the mining firms, helping them to overcome a significant barrier to land accumulation through the de facto abolition of landed property. The analysis is based on a qualitative case study on the expansion ...
Aufsatz
Continuous modelling of single layer 2D carbonnanostructures based on a modified Cauchy–Born rule
(2023-09-08)
Graphene is the thinnest known structure. It consists of a single layer of carbon atoms and has unique mechanical properties. The carbon atoms form bonds with neighbouring atoms that can be described by interatomic potentials. A simulation of molecular mechanical processes can be performed by applying the formalism of the finite element method to the interatomic potentials. Neglecting local effects, a continuum formulation is an efficient alternative to a discrete model. The continuum formulation requires a connection ...
Aufsatz
Saudi Arabian strategy reassessment since 2003: The emergence of a regional leadership via Neoclassical Realist lenses
(2023-06-12)
This article argues that the well-discussed international behaviour change in Saudi Arabia, rather than being a consequence of the so-called Arab Spring, resulted from a grand strategy reassessment in the early 2000s. Grand strategy concerns how states assess the geostrategic environment, plan resource allocation and prioritize policy to meet national interests. Since the 1970s, Riyadh judged its geopolitical vulnerabilities concerning Iran and Iraq realistically, supporting the least threatening actor from the two ...