955 research outputs found
Manufacturing of functionally graded ceramics with in-space resources
No full textBuilding habitats on the Moon is required for long-duration missions foreseen in the very near future. The availability of lunar regolith will allow to manufacture such in space habitats and reduce the cost of space missions. However, the Moon has specific environmental characteristics that are different compared to terrestrial habitats: meteoroids impacts, high cosmic radiation level and high temperature gradient, etc. Functionally graded materials (FGM) are high-performance composite materials, featuring such advantages as localized tailoring of material properties, improved interfacial boundary compatibility, and enhanced thermomechanical behaviour. Much of the current in-situ resource utilization (ISRU) manufacturing research explores additive manufacturing (AM) of as-received regolith, with some consideration given to metal alloys extracted in-situ. This study combines these two aspects by investigating the feasibility of in-situ manufactured metallic-regolith FGMs. In this study three regolith simulant powders were first characterized based on their similarity with the actual lunar regolith and then assessed further for their AM processability. Digital Light Processing (DLP), Spark Plasma Sintering (SPS) and laser scanning, were selected due to their compatibility with metallic-ceramic processing in a space environment. The chosen AM techniques were first assessed on their capability to effectively consolidate regolith alone, before progressing to AM of regolith directly onto metallic substrates. The powder characterisation proved that all three simulants have composition and particle size distribution close to the ones of the actual lunar regolith. Powders are composed of plagioclase, pyroxene and iron titanium oxide. Dense regolith samples were successfully shaped with DLP and subsequently consolidated with Spark Plasma Sintering at 1050 °C under 80 MPa with crushed lunar regolith simulant. Optimized processing conditions based on the sintering temperature, initial powder particle size and different compositions in the lunar regolith powders were identified. The reduction of the particle size proved to be the most significant factor to obtain a good densification. Additive manufacturing was then studied as a potential technique to manufacture functionally graded materials combining the properties of the lunar regolith and metals (Ti6Al4V and 316L). The combination of lunar regolith and Ti6Al4V was found as the most promising. The hardness profile showed a gradual transition between the two layers and the interface was found to be strong and without any cracking or delamination. Furthermore, interesting segregation effects at the interface regions were observed and investigated in this work.Additionally, results from this study indicate that laser-based additive manufacturing techniques could be a feasible method for application of FGM coatings, which presents a topic for further study focused on wear, corrosion and thermal resistant in-situ resource coatings.While the current study showed that it is feasible to AM FGMs from lunar regolith, further developments of a fully optimized method have the potential to produce tailored, high-performance materials in an off-earth manufacturing setting, for the production of aerospace, robotic, or architectural components.Mechanical Engineerin
The birth and early years of INA, the International Neurotoxicology Association
No full textAbstractThe International Neurotoxicology Association (INA) is a scientific society whose members have interest and expertise in the discipline of neurotoxicology. The idea of forming INA was born in 1984, as a follow-up to a NATO-sponsored meeting on Toxicology of the Nervous System. INA held its first meeting in the Netherlands in 1987 and has had continuous meetings every other year since then. INA is registered as a scientific society in the Netherlands, and is an affiliated society of IUTOX. This paper presents a personal account of the events that led to the birth of INA, and of the first fifteen years of this association
Koło się zamyka
Full text linkIna Söllner was one of Schulz’s young sitters. As an adult person, she discovered in her autograph book a portrait of her mother, Ina, made by Schulz. The drawing called The King of Frogs [Żabi król] and a dedication referring to her mother sitting provoke the author to analyze her family connections with Schulz. Even though she does not remember her meeting with the artist, she reconstructs Schulz’s place in her biography and the circumstances under which they might have met
Pioneering Doktormutter Remembering Ina-Maria Greverus
No full textThe author reconsiders German scholar Ina-Maria Greverus as a committed feminist supporter of female doctoral students and early career academics. Greverus acted as an innovator especially in the realms of anthropology and aesthetics, and initiated a new international dialogue forum with the Anthropological Journal or European Cultures, which she founded in 1990 together with Christian Giordano.</p
The Circle Closes
No full textIna Söllner was one of Schulz’s young sitters. As an adult person, she discovered in her autograph book a portrait of her mother, Ina, made by Schulz. The drawing called The King of Frogs [Żabi król] and a dedication referring to her mother sitting provoke the author to analyze her family connections with Schulz. Even though she does not remember her meeting with the artist, she reconstructs Schulz’s place in her biography and the circumstances under which they might have met
Chronicles of Oklahoma
Full text linkArticle discusses the life of the author and her family after homesteading in Logan County, Oklahoma Territory. Ina Robinson discusses the difficulties faced on the frontier, the people they encountered there, education available, and social life
La Cañada Drive, River Road to Ina Road
No full texttableOfContents: The Pima County Department of Transportation proposes to widen approximately 2.7 miles of La Cañada Drive from a two-lane arterial road into a four-lane arterial road between River Road and Ina Road. The project also includes the installation of a closed stormwater collection and conveyance system, installation of culverts to create an all-weather roadway, and addition of curbs, sidewalks, bike lanes, and a public use trail
Ina M. McCausland Correspondence
Full text linkEntry is a letter from the Maine State Library in receipt of a book for the Maine Author Collection
PRIVATIZACIJA INA-e; UZROCI, MODEL, POSLJEDICE : Diplomski rad
Full text linkU Republici Hrvatskoj 90-ih godina prošlog stoljeća provođeni su procesi pretvorbe i privatizacije. Hrvatski privatizacijski model bio je osmišljen na način da se sastojao od dvije etape; pretvorbene i privatizacijske. Postupak pretvorbe društvenog vlasništva započeo je 23. travnja 1991. donošenjem Zakona o pretvorbi društvenih poduzeća. Pretvorbenu etapu obilježavaju dva paralelna tijeka; formalnopravni tijek i financijski tijek pretvorbe. Druga etapa privatizacijskog procesa je privatizacijska etapa koja se dijeli na: privatizaciju portfelja u posjedu Hrvatskog fonda za privatizaciju (HFP), unutar koje imamo kuponsku privatizaciju i na privatizaciju koja se odvija izvan HFP (privatizacija javnih poduzeća i privatizacija bankarske industrije). Proces privatizacije započeo je zapravo već donošenjem Zakona o Hrvatskom fondu za privatizaciju (HFP), a sam HFP je osnovan 1.svibnja 1993.g. Privatizaciju javnih poduzeća provodi Ministarstvo gospodarstva javnom dražbom ili izravnim pregovorima s potencijalnim kupcima. U procesu privatizacije javnih poduzeća krenulo se na privatizaciju INA-e.
Od 1990. INA je poduzeće u državnom vlasništvu, a od 1993. dioničko društvo. Prva faza privatizacije, u kojoj kupnjom 25 posto plus jedne dionice Inin strateški partner postaje MOL, završena je 2003. godine. U 2006. godini INA je ušla u sljedeću fazu privatizacije kada je Vlada RH pustila u prodaju 1.700.000 njenih redovnih dionica. U siječnju 2009. godine MOL i Vlada Republike Hrvatske potpisali su Dodatak dioničarskom ugovoru. Sukladno tim ugovorima INA, d.d. izlazi iz zakonski uređenog dijela plinskog poslovanja. Činjenice da je osnovano Istražno povjerenstvo za privatizaciju Ina-e, da je bivši premijer Sanader uhićen i suđen za primanje mita od MOL-a, da je RH podnijela arbitražnu tužbu protiv MOL-a, a i podatak studije američke konzultantske tvrtke AT&Karney te Oil & Gas Consultinga koja je pokazala da je MOL nakon preuzimanja Ine hrvatsku stranu nepridržavanjem dogovora oštetio za 6,2 milijarde dolara upućuju na nedostatak strategije o hrvatskoj energetskoj budućnosti, već upravo suprotno pokazuju kako se u privatizaciju Ina-e ušlo bez strategije i sa samo jednim ciljem, a to je zadovoljiti vlastite i političke interese. Želja autorice je da se iz pogreške koja je nastala u privatizaciji INA-e, nauči nešto za privatizacije koje tek dolaze, kako se takve greške ne bi ponovile. INA je jedna od tvrtki koji su nositelji hrvatskog gospodarstva, nažalost mi se prema njoj nismo tako odnosili. Pitanje je što je RH mogla dobiti da je INA ostala u njenom većinskom vlasništvu. To su sad samo nagađanja. Financijski rezultati INA-e zadnjih godina su pozitivni, pokazatelji za 2015. i prvi kvartal 2016. pokazuju da posluje s gubitkom, što i kako će biti dalje pokazati će vrijeme koje je pred nama.In Croatia, the 90’s of last century were implemented processes of transformation and privatization. Croatian privatization model was designed in such a way that it consisted of two stages; transformation and privatization. The process of transformation of social ownership began on April 23, 1991. Transformation stage is marked by two parallel flow; formal legal flows and financial flows transformation. The second stage of the privatization process of was privatization stage, which is divided into the privatization portfolio held by the Croatian Privatization Fund (HFP), within which we have the coupon privatization and the privatization that takes place outside of the HFP (privatization of public enterprises and privatization of the banking industry). The privatization process started in May 1, 1993. In the process of privatization of public enterprises moved on to the privatization of INA.
Since 1990, INA is a company owned by the state and since 1993 a joint stock company. The first stage of privatization, in which the purchase of 25 percent plus one share of INA's strategic partner MOL station, completed in 2003. In 2006 INA went into the next stage of privatization when the Government has launched the sale of 1,700,000 of its common shares. In January 2009 MOL and the Croatian government signed the Amendment to the Shareholders Agreement. Pursuant to these agreements, INA, d.d exits from the regulated part of the gas business. The fact that the established inquiry commission for the privatization of INA that former Prime Minister Ivo Sanader was arrested and tried for accepting bribes from MOL that the Republic of Croatia filed an arbitration claim against MOL, and information studies of US consulting firm AT & Karney and Oil & gas Consulting which showed that MOL following the takeover of INA Croatian side of non-compliance with the agreement damaged for $ 6.2 billion refer to the lack of strategy on Croatia's energy future, but on the contrary show that the privatization of INA is entered without a strategy and with only one goal and that is to meet their own and political interests. The desire of the author is that of errors that occurred in the privatization of INA, learn something privatization yet to come, that such mistakes would not happen again. INA is one of the companies which are the carriers of the Croatian economy, unfortunately we didn´t treated her on that way. The question is what is the Republic of Croatia could get to the INA remained in its majority property. They are now just speculation. Financial results of INA´s last year are positive. Indicators for 2015 and the first quarter of 2016 indicate that operates at a loss, and the time will show what happens next
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