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Effect of Regenerated-Foundry Sand on the Mechanical Properties of Core
Kang, Bu Yoon,Kim, Kyeong Ho,Park, Dae Won,Lee, Man Sig Trans Tech Publications, Ltd. 2018 Materials science forum Vol.922 No.-
<P>Metal foundries use high quality sand in the casting process and produce vast amounts of used foundry sand (UFS). Thus, in order to make the best use of foundry sand in the casting process, it is essential to demonstrate an appropriate recycling method and verify the influence of regenerated foundry sand (RFS) on the mechanical properties of core. In this study, physical and chemical characterizations were conducted on the RFS and the physical properties of cores containing different proportions of RFS were investigated with respect to the flexural strength. The UFS produced in controlled conditions was recycled by a wet type method and the regular foundry sand was replaced with varying proportions of RFS by weight (0, 20, 40 and 60 wt. %). Although the gradation of RFS was analogous with the regular foundry sand, the flexural strength test indicated that the sand mixture with 20 wt. % replacement of regular foundry sand was appropriate for core making without a drastic decrease of flexural strength. The flexural strength decreased with the increase of RFS contents at replacement proportion more than 20 wt. %.</P>
강부윤 ( Bu Yoon Kang ),김경호 ( Kyeongho Kim ),박대원 ( Dae Won Park ),이만식 ( Man Sig Lee ) 한국폐기물자원순환학회(구 한국폐기물학회) 2017 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2017 No.-
Sand casting is extensively applied both ferrous and non-ferrous metal foundries. Thus tremendous amount of Used Foundry Sand (UFS) is being produced in foundry industry. In this regard, it is required to establish appropriate recycling method of UFS. In order to verify effect of recycling number of cleaning solution, the properties of Regenerated Foundry Sand (RFS) were investigated. UFS was produced in controlled condition using inorganic binder and treated by wet recycling method. Optimized recycling condition which removes binder from sand grains to a sufficient degree was set and UFS was recycled in that manner. Removal efficiency of binder was examined using ion chromatography analysis of used cleaning solution and X-ray fluorescence spectroscopy analysis of RFS. Particle size distribution was investigated by sieve analysis test and surface morphology of RFS was also investigated by using scanning electron microscope.
Kim, Min-Kyeong,Jeon, Bu-Nam,Koh, Dong-In,Kim, Kyung-Sup,Park, So-Yoon,Yun, Chae-Ok,Hur, Man-Wook American Society for Biochemistry and Molecular Bi 2013 The Journal of biological chemistry Vol.288 No.10
<P>The human POZ domain and Krüppel-like zinc finger (POK) family proteins play important roles in the regulation of apoptosis, cell proliferation, differentiation, development, oncogenesis, and tumor suppression. A novel POK family transcription factor, BTB/POZ and zinc finger domains factor on chromosome 1 (BOZF-1; also called ZBTB8A), contains a POZ domain and two C<SUB>2</SUB>H<SUB>2</SUB>-type Krüppel-like zinc fingers and is localized at nuclear speckles. Compared with paired normal tissues, BOZF1 expression is increased in cancer tissues of the prostate, breast, and cervix. BOZF1 repressed the transcription of <I>p21WAF</I>/<I>CDKN1A</I> by acting on the proximal promoter concentrated with Sp1-binding GC boxes. BOZF1 competed with Sp1 in binding to GC boxes 1–5/6 of the <I>CDKN1A</I> proximal promoter. In addition, BOZF1 interacted with p53 and decreased the acetylation of p53 by p300, which reduced the DNA binding activity of p53 at the far distal p53-binding element. BOZF1 blocked the two major molecular events that are important in both constitutive and inducible transcription activation of <I>CDKN1A</I>. BOZF1 is unique in that it bound to all the proximal GC boxes to repress transcription, and it inhibited p53 acetylation without affecting p53 stability. BOZF1 might be a novel proto-oncoprotein that stimulates cell proliferation.</P>
Inhibition of a Neutral Form of Sphingomyelinase by Alkylthioureido-1,3-propandiols, KY353X Series
( Sang Mi Jung ),( Eui Man Jeong ),( Dong Hwawn Jo ),( Mi Reyoung Chin ),( Hyung Jin Jun ),( Yong Hyun Kim ),( Hyung Jun Jeon ),( Dong Hun Lee ),( Mi Ja Park ),( Mi Jung Oh ),( Chul Bu Yim ),( Dae Kyo 한국응용약물학회 2003 Biomolecules & Therapeutics(구 응용약물학회지) Vol.11 No.3