The Effects of Varying Composition and Build Direction on Direct Metal Deposition Fabricated Inconel 718

Inconel 718 (IN718) is a popular wrought superalloy, and is currently being investigated for additive manufacturing (AM) applications in the aerospace industry. However, overaging and the presence of microcracks have caused a significant reduction in properties. The purpose of this study is to meet or exceed the mechanical properties of wrought IN718 by varying the composition and build direction of the AM alloy. Alternative compositions were selected with Oerlilon Metco’s Rapid Alloy Development (RAD) software, and differ in niobium content, which increases the fraction of the primary strengthening phase (γʺ). Direct metal deposition (DMD) was used to fabricate the samples, which then underwent a heat treatment to precipitate γʺ. Tensile testing, metallography, and scanning electron microscopy (SEM) were performed on the samples. Tensile testing found that the AM samples could exceed wrought strength with the appropriate composition and build direction. The horizontal build containing the highest niobium percentage achieved an average yield strength of 1400 MPa, higher than the 1218 MPa for the wrought. Samples in the horizontal build direction were consistently stronger than vertical alternatives due to their anisotropic grain morphology. Despite comparable strength, AM samples of all compositions had significantly reduced ductility with an average range of 1-3% elongation compared to an average of 21% for the wrought samples. Microstructural analysis revealed dendritic structures and cracks between print layers in the AM samples, which contributed to this reduction in ductility

Indonesian Muslim Masculinities in Australia

This article is an inquiry into evolving forms of masculinity in Indonesia. It refers to data collected during a pilot project on the construction of Indonesian Muslim masculinities in Australia when Indonesian men arrive and encounter Anglo-Australian men. Using the technique of asking the Indonesian interviewees to comment on ‘Australian’ men allowed analysis of what the Indonesian men thought about their own cultural tropes of masculinity. It emerged that their gender construction coalesced around two important cultural nodes of discourse about how to be a ‘man’: firstly, the Indonesian urban interpretation of global ‘hypermasculinity’; and secondly, the moral role of men in Islamic discourse

Ontogeny of the barley plant as related to mutation expression and detection of pollen mutations.

Clustering of mutant pollen grains in a population of normal pollen due to premeiotic mutational events complicates translating mutation frequencies into rates. Embryo ontogeny in barley will be described and used to illustrate the formation of such mutant clusters. The nature of the statistics for mutation frequency will be described from a study of the reversion frequencies of various waxy mutants in barley. Computer analysis by a "jackknife" method of the reversion frequencies of a waxy mutant treated with the mutagen sodium azide showed a significantly higher reversion frequency than untreated material. Problems of the computer analysis suggest a better experimental design for pollen mutation experiments. Preliminary work on computer modeling for pollen development and mutation will be described

ALONE: A Dataset for Toxic Behavior among Adolescents on Twitter

The convenience of social media has also enabled its misuse, potentially resulting in toxic behavior. Nearly 66% of internet users have observed online harassment, and 41% claim personal experience, with 18% facing severe forms of online harassment. This toxic communication has a significant impact on the well-being of young individuals, affecting mental health and, in some cases, resulting in suicide. These communications exhibit complex linguistic and contextual characteristics, making recognition of such narratives challenging. In this paper, we provide a multimodal dataset of toxic social media interactions between confirmed high school students, called ALONE (AdoLescents ON twittEr), along with descriptive explanation. Each instance of interaction includes tweets, images, emoji and related metadata. Our observations show that individual tweets do not provide sufficient evidence for toxic behavior, and meaningful use of context in interactions can enable highlighting or exonerating tweets with purported toxicity.Comment: Accepted: Social Informatics 202

Msh2 Blocks an Alternative Mechanism for Non-Homologous Tail Removal during Single-Strand Annealing in Saccharomyces cerevisiae

Chromosomal translocations are frequently observed in cells exposed to agents that cause DNA double-strand breaks (DSBs), such as ionizing radiation and chemotherapeutic drugs, and are often associated with tumors in mammals. Recently, translocation formation in the budding yeast, Saccharomyces cerevisiae, has been found to occur at high frequencies following the creation of multiple DSBs adjacent to repetitive sequences on non-homologous chromosomes. The genetic control of translocation formation and the chromosome complements of the clones that contain translocations suggest that translocation formation occurs by single-strand annealing (SSA). Among the factors important for translocation formation by SSA is the central mismatch repair (MMR) and homologous recombination (HR) factor, Msh2. Here we describe the effects of several msh2 missense mutations on translocation formation that suggest that Msh2 has separable functions in stabilizing annealed single strands, and removing non-homologous sequences from their ends. Additionally, interactions between the msh2 alleles and a null allele of RAD1, which encodes a subunit of a nuclease critical for the removal of non-homologous tails suggest that Msh2 blocks an alternative mechanism for removing these sequences. These results suggest that Msh2 plays multiple roles in the formation of chromosomal translocations following acute levels of DNA damage

The lucky few: Female graduands of communication studies in the Indonesian media industry

For some years, women have been entering Indonesian communications degrees in much larger numbers than men, but only a minority of media workers at present are women. This paper reports on research into the limiting factors, which affect the progress of female communications graduates into professional media work. A case study was used to investigate the gap between the number of women enrolling in communication studies at Universitas Sebelas Maret in Solo, Central Java, and those working in television, radio, newspapers, tabloids and journals, public relations and advertising across Indonesia. This paper concludes by describing some of the factors, which contribute to the apparent “mismatch” phenomenon

Comparative Masculinities: Why Islamic Indonesian Men are Great Mates and Australian Men are Girls

There may well be no known human societies in which some form of masculinity has not emerged as dominant, more socially central, more associated with power, in which a pattern of practices embodying the currently most honoured way of being male legitimates the superordination of men over women. This paper shows what a small sample of Indonesian men living in Australia thought of Australian masculinity, revealing much about hegemonic masculinity in Indonesia in the process, and disclosing some uncomfortable uniformities concerning men in both countries