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Use of Thixoforming as a Manufacturing Method for Metallic Composites
Hüsnügül Yilmaz Atay,David Aišman,Hana Jirková,Mária Behulova,Bohuslav Mašek 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.9
Thixoforming is one of the members of the family of semi-solid forming processes. It is possible to obtain complex shapeof materials by this method and unconventional microstructures can be achieved due to its thixotropic properties. However,in this study thixoforming was used not only as forming method but also as a manufacturing method. Metallic compositeswere manufactured by a process of integration of powder metallurgy and semi-solid production technique. The mixture ofCo72.5B15Si12.5alloy and Fe powders become partially melted, compressed mechanically in semi-solid state and filled intricatecavities. Without changing alloy structure, it could be possible to reinforce it with Fe powders. Moreover, the final shapeof the product could be achieved at the same time. Prior to the process, Co72.5B15Si12.5alloy obtained in the form of stickwas characterized by X-ray diffraction (XRD), scanning electron microscopy–energy dispersive spectroscopy (SEM–EDX),differential thermal analysis-thermogravimetry (DTA-TG), light microscope and micro-hardness machine. The stick wasmilled to get alloy powders and they were blended with iron. Characterization of the structures of the composite materialwas performed. It was concluded that the heating process of iron and alloy powders provides the formation of compact metalmatrix composites.
Informing direct neutron capture on tin isotopes near the N=82 shell closure
Manning, B.,Arbanas, G.,Cizewski, J. A.,Kozub, R. L.,Ahn, S.,Allmond, J. M.,Bardayan, D. W.,Chae, K. Y.,Chipps, K. A.,Howard, M. E.,Jones, K. L.,Liang, J. F.,Matos, M.,Nesaraja, C. D.,Nunes, F. M.,O'M American Physical Society 2019 Physical Review C Vol.99 No.4
Simmonds, P. G.,Rigby, M.,Manning, A. J.,Lunt, M. F.,O&,apos,Doherty, S.,McCulloch, A.,Fraser, P. J.,Henne, S.,Vollmer, M. K.,Mü,hle, J.,Weiss, R. F.,Salameh, P. K.,Young, D.,Reimann, S.,Wenger Copernicus GmbH 2016 Atmospheric Chemistry and Physics Vol.16 No.1
<P>Abstract. High frequency, in situ observations from 11 globally distributed sites for the period 1994-2014 and archived air measurements dating from 1978 onward have been used to determine the global growth rate of 1,1-difluoroethane (HFC-152a, CH3CHF2). These observations have been combined with a range of atmospheric transport models to derive global emission estimates in a top-down approach. HFC-152a is a greenhouse gas with a short atmospheric lifetime of about 1.5 years. Since it does not contain chlorine or bromine, HFC-152a makes no direct contribution to the destruction of stratospheric ozone and is therefore used as a substitute for the ozone depleting chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs). The concentration of HFC-152a has grown substantially since the first direct measurements in 1994, reaching a maximum annual global growth rate of 0.84 ± 0.05 ppt yr−1 in 2006, implying a substantial increase in emissions up to 2006. However, since 2007, the annual rate of growth has slowed to 0.38 ± 0.04 ppt yr−1 in 2010 with a further decline to an annual average rate of growth in 2013-2014 of −0.06 ± 0.05 ppt yr−1. The annual average Northern Hemisphere (NH) mole fraction in 1994 was 1.2 ppt rising to an annual average mole fraction of 10.1 ppt in 2014. Average annual mole fractions in the Southern Hemisphere (SH) in 1998 and 2014 were 0.84 and 4.5 ppt, respectively. We estimate global emissions of HFC-152a have risen from 7.3 ± 5.6 Gg yr−1 in 1994 to a maximum of 54.4 ± 17.1 Gg yr−1 in 2011, declining to 52.5 ± 20.1 Gg yr−1 in 2014 or 7.2 ± 2.8 Tg-CO2 eq yr−1. Analysis of mole fraction enhancements above regional background atmospheric levels suggests substantial emissions from North America, Asia, and Europe. Global HFC emissions (so called “bottom up” emissions) reported by the United Nations Framework Convention on Climate Change (UNFCCC) are based on cumulative national emission data reported to the UNFCCC, which in turn are based on national consumption data. There appears to be a significant underestimate ( > 20 Gg) of “bottom-up” reported emissions of HFC-152a, possibly arising from largely underestimated USA emissions and undeclared Asian emissions. </P>
Kim, S.,Kwon, M.c.,Ryu, M.,Chung, H.,Tadi, S.,Kim, Y.,Man Kim, J.,Lee, S.,Park, J.,Kweon, G.,Ryu, S.W.,Jo, Y.,Lee, C.H.,Hatakeyama, H.,Goto, Y.i.,Yim, Y.H.,Chung, J.,Kong, Y.Y.,Shong, M. Cell Press 2012 Cell metabolism Vol.16 No.2
Although substantial progress has been made in understanding the mechanisms underlying the expression of mtDNA-encoded polypeptides, the regulatory factors involved in mitoribosome-mediated synthesis and simultaneous insertion of mitochondrial oxidative phosphorylation (OXPHOS) polypeptides into the inner membrane of mitochondria are still unclear. In the present study, disruption of the mouse Crif1 gene, which encodes a mitochondrial protein, resulted in a profound deficiency in OXPHOS caused by the disappearance of OXPHOS subunits and complexes in vivo. CRIF1 was associated with large mitoribosomal subunits that were located close to the polypeptide exit tunnel, and the elimination of CRIF1 led to both aberrant synthesis and defective insertion of mtDNA-encoded nascent OXPHOS polypeptides into the inner membrane. CRIF1 interacted with nascent OXPHOS polypeptides and molecular chaperones, e.g., Tid1. Taken together, these results suggest that CRIF1 plays a critical role in the integration of OXPHOS polypeptides into the mitochondrial membrane in mammals.
Ganesan, A. L.,Rigby, M.,Zammit-Mangion, A.,Manning, A. J.,Prinn, R. G.,Fraser, P. J.,Harth, C. M.,Kim, K.-R.,Krummel, P. B.,Li, S.,Mü,hle, J.,O&,apos,Doherty, S. J.,Park, S.,Salameh, P. K.,Ste Copernicus GmbH 2014 Atmospheric chemistry and physics Vol.14 No.8
<P>Abstract. We present a hierarchical Bayesian method for atmospheric trace gas inversions. This method is used to estimate emissions of trace gases as well as 'hyper-parameters' that characterize the probability density functions (PDFs) of the a priori emissions and model-measurement covariances. By exploring the space of 'uncertainties in uncertainties', we show that the hierarchical method results in a more complete estimation of emissions and their uncertainties than traditional Bayesian inversions, which rely heavily on expert judgment. We present an analysis that shows the effect of including hyper-parameters, which are themselves informed by the data, and show that this method can serve to reduce the effect of errors in assumptions made about the a priori emissions and model-measurement uncertainties. We then apply this method to the estimation of sulfur hexafluoride (SF6) emissions over 2012 for the regions surrounding four Advanced Global Atmospheric Gases Experiment (AGAGE) stations. We find that improper accounting of model representation uncertainties, in particular, can lead to the derivation of emissions and associated uncertainties that are unrealistic and show that those derived using the hierarchical method are likely to be more representative of the true uncertainties in the system. We demonstrate through this SF6 case study that this method is less sensitive to outliers in the data and to subjective assumptions about a priori emissions and model-measurement uncertainties than traditional methods. </P>
Dopaminergic Supersensitivity in G Protein-Coupled Receptor Kinase 6-Deficient Mice
( Raul R. Gainetdinov ),( Laura M. Bohn ),( Tatyana D. Sotnikova ),( Michel Cyr ),( Aki Laakso ),( Alexander D. Macrae ),( Gonzalo E. Torres ),( Kyeong Man Kim ),( Robert J. Lefkowitz ),( Marc G. Caro 전남대학교 약품개발연구소 2003 약품개발연구지 Vol.12 No.-
MODELING OF INTERACTION LAYER GROWTH BETWEEN U-Mo PARTICLES AND AN Al MATRIX
Kim, Yeon Soo,Hofman, G.L.,Ryu, Ho Jin,Park, Jong Man,Robinson, A.B.,Wachs, D.M. Korean Nuclear Society 2013 Nuclear Engineering and Technology Vol.45 No.7
Interaction layer growth between U-Mo alloy fuel particles and Al in a dispersion fuel is a concern due to the volume expansion and other unfavorable irradiation behavior of the interaction product. To reduce interaction layer (IL) growth, a small amount of Si is added to the Al. As a result, IL growth is affected by the Si content in the Al matrix. In order to predict IL growth during fabrication and irradiation, empirical models were developed. For IL growth prediction during fabrication and any follow-on heating process before irradiation, out-of-pile heating test data were used to develop kinetic correlations. Two out-of-pile correlations, one for the pure Al matrix and the other for the Al matrix with Si addition, respectively, were developed, which are Arrhenius equations that include temperature and time. For IL growth predictions during irradiation, the out-of-pile correlations were modified to include a fission-rate term to consider fission enhanced diffusion, and multiplication factors to incorporate the Si addition effect and the effect of the Mo content. The in-pile correlation is applicable for a pure Al matrix and an Al matrix with the Si content up to 8 wt%, for fuel temperatures up to $200^{\circ}C$, and for Mo content in the range of 6 - 10wt%. In order to cover these ranges, in-pile data were included in modeling from various tests, such as the US RERTR-4, -5, -6, -7 and -9 tests and Korea's KOMO-4 test, that were designed to systematically examine the effects of the fission rate, temperature, Si content in Al matrix, and Mo content in U-Mo particles. A model converting the IL thickness to the IL volume fraction in the meat was also developed.