Sintering behaviour of 3D-printed 18K 5N gold alloy by binder jetting: a preliminary study

Binder jetting is a versatile additive manufacturing technique suitable to produce alloys that are difficult to obtain by powder bed fusion techniques, such as precious metals, due to their high reflectivity and thermal conductivity. In this study, a 18K 5N gold alloy powder was employed in the printing process. Different heat treatments and densification processes were employed to achieve final-stage sintering and remove residual porosity, whilst controlling the evolution of copper oxides by reduction with hydrogen and graphite. Powder, green and sintered samples were characterised at the microstructural level by X-ray diffraction, microscopy and energy dispersive X-ray spectroscopy to assess phase transitions and secondary-phase formation. Oxide-free components with a final relative density above 90% were achieved by densification at 830 °C combined with carbon- and CO-induced reduction of tenorite and cuprite. The optimal manufacturing route was chosen to produce a bezel, as a case study for the adoption of this technique in the jewellery industry

Leave the cheaters in peace: If you poke around the Ashley Madison data, you\u27re aiding and abetting the hackers

When a person\u27s confidential data is exposed in violation of a legitimate expectation of privacy, it shouldn\u27t matter whether that person is a saint or a sinner. A privacy invasion is a privacy invasion — and we must rise to defend the victims, whether we like them or not. Last week, a group of hackers calling themselves the Impact Team made good on last month\u27s threat to leak the account information of over 32 million members of Avid Life Media\u27s (ALM) online dating service for married people, Ashley Madison

Leave the cheaters in peace: If you poke around the Ashley Madison data, you\u27re aiding and abetting the hackers

When a person\u27s confidential data is exposed in violation of a legitimate expectation of privacy, it shouldn\u27t matter whether that person is a saint or a sinner. A privacy invasion is a privacy invasion — and we must rise to defend the victims, whether we like them or not. Last week, a group of hackers calling themselves the Impact Team made good on last month\u27s threat to leak the account information of over 32 million members of Avid Life Media\u27s (ALM) online dating service for married people, Ashley Madison

Comparative analysis of gas atomised and recycled 316L stainless steel powders for Binder Jetting

In our work, we investigate the suitability of a 316L stainless steel powder from scrap metal recycling for binder jetting and the results are compared to those obtained for a gas atomised feedstock. First, the main morphological features of the particles, in particular sphericity and size distribution, are measured by static image granulometry and scanning electron microscopy. Then, the dispensing rate and the printer deposition parameters are optimised to obtain a smooth and homogeneous powder bed. After printing, the building box is cured at 180 °C to consolidate the green components, whose density and geometrical accuracy are determined by caliper measurement. Finally, the microstructural and mechanical properties of the vacuum sintered specimens are studied. Phase composition is determined by x-ray diffraction and microscopy, with specific attention to δ-ferrite formation at the grain boundary. Hardness is evaluated by Vickers micro-indentation and compared to typical properties of 316L by conventional manufacturing

Alien Registration- Bishop, Harry E. (Camden, Knox County)

https://digitalmaine.com/alien_docs/15133/thumbnail.jp

JIT implementation in Egyptian manufacturing firms: some empirical evidence

Abstract: Purpose – This study aims to delineate the major human modifications to be undertaken prior to just-in-time (JIT) implementation in Egyptian manufacturing firms; to discern the benefits obtained from JIT implementation; to identify the problems that Egyptian manufacturing companies typically encounter in implementing JIT philosophy; and to explore the relationship between human modification efforts to be undertaken prior to JIT implementation and JIT success. Design/methodology/approach – The data analyzed in this article was collected from a mail questionnaire sent to 200 manufacturing firms in Egypt. The findings of this study indicate that JIT success is significantly associated with human resources modification efforts undertaken in preparation for JIT implementation. Findings – JIT philosophy can be successfully implemented in Egyptian manufacturing companies; just like their peers in developed countries including Japan, USA and the Far East; with thoughtful attention applied to each individual company. Implementation of JIT can greatly improve the operations performance of Egyptian manufacturing firms. Practical implications – A very significant managerial implication of the current study is that the Egyptian manufacturing companies can use JIT as a strategic philosophy, rather than as a temporary solution for operations obstacles. Another managerial implication of this study is that manufacturing firms are advised to be aware of the meticulous relationship between human modification efforts and the successful implementation of JIT philosophy. Originality/value – This study contributes to what is a very limited amount of empirical studies of JIT implementation in LDCs in general and in Egypt in particular

Potential Biological and Climatic Factors That Influence the Incidence and Persistence of Highly Pathogenic H5N1 Avian Influenza Virus in Egypt

Highly pathogenic H5N1 avian influenza virus (A/H5N1) of clade 2.2.1 is endemic in poultry in Egypt where the highest number of human infections worldwide was reported. During the last 12 years the Egyptian A/H5N1 evolved into several genotypes. In 2007-2014 vaccinated poultry suffered from antigenic drift variants of clade 2.2.1.1 and in 2014/2015 an unprecedented upsurge of A/H5N1 clade 2.2.1.2 occurred in poultry and humans. Factors contributing to the endemicity or re-emergence of A/H5N1 in poultry in Egypt remain unclear. Here, three potential factors were studied: climatic factors (temperature, relative humidity, and wind speed), biological fitness in vitro, and pathogenicity in domestic Pekin and Muscovy ducks. Statistical analyses using negative binomial regression models indicated that ambient temperature in winter months influenced the spread of A/H5N1 in different geographic areas analyzed in this study. In vitro, at 4 and 56°C 2.2.1.1 and recent 2.2.1.2 viruses were more stable than other viruses used in this study. Further, Pekin ducks were more resistant than Muscovy ducks and the viruses were excreted for up to 2 weeks post-infection assuming a strong role as a reservoir. Taken together, ambient temperature in winter months potentially contributes to increasing outbreaks in some regions in Egypt. Heat stability of clade 2.2.1.1 and recent 2.2.1.2 viruses probably favors their persistence at elevated temperatures. Importantly, asymptomatically infected Pekin ducks may play an important role in the spread of avian and human-like A/H5N1 in Egypt. Therefore, control measures including targeted surveillance and culling of silently infected Pekin ducks should be considered