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Tsuzuki, Y.,Duran, D.H.,Kuroki, Y.,Uehara, F.,Ashizawa, K.,Fujihara, N. Asian Australasian Association of Animal Productio 1998 Animal Bioscience Vol.11 No.3
The present studies were undertaken to evaluate the effects of a low concentration of dimethyl-sulfoxide (DMSO) on in vitro maturation and development of bovine oocytes fertilized in vitro. Significantly more oocytes reached the metaphase stage of the second meiotic division in TCM-199 supplemented with $50{\mu}M$ DMSO than in the control medium (p < 0.05), and the highest rates of development up to the blastocyst stage were obtained when $50{\mu}M$ DMSO was added to the maturation and culture media (p < 0.05). The avarage of cell numbers of the blastocysts, expanded and hatched blastocysts cultured with $50{\mu}M$ DMSO were 81.7, 125.7 and 129.9 cells, respectively. The proportion of blastocysts with normal chromosome numbers was 90.5%. These results suggest that the addition of $50{\mu}M$ DMSO is beneficial for the maturation of bovine oocytes and production of the blastocysts with high quality.
Compression Behavior of Form Block Walls Corresponding to the Strength of Block and Grout Concrete
S. Y. Seo,S. M. Jeon,K. T. Kim,M. Kuroki,K. Kikuchi 한국콘크리트학회 2015 International Journal of Concrete Structures and M Vol.9 No.1
This study aimed to present a reinforced concrete block system that reduces the flange thickness of the existing form block used in new buildings and optimizes the web form, and can thus capable of being used in the seismic retrofit of new and existing buildings. By conducting a compression test and finite element analysis based on the block and grouted concrete strength, it attempted to determine the compression capacity of the form block that can be used in new construction and seismic retrofit. As a result, the comparison of the strength equation from Architectural Institute of Japan to the prism compression test showed that the mortar coefficient of 0.55 was suitable instead of 0.75 recommended in the equation. The stress?strain relation of the block was proposed as a bi-linear model based on the compression test result of the single form block. Using the proposed model, finite element analysis was conducted on the prism specimens, and it was shown that the proposed model predicted the compression behavior of the form block appropriately.
Compaction of Ultra-fine WC Powder by High-Speed Centrifugal Compaction Process
Suzuki Hiroyuki Y.,Kadono Yuichi,Kuroki Hidenori 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
High-Speed Centrifugal Compaction Process is one of slip-using compacting method originally developed for processing of oxide ceramics. In this study, we apply the HCP to ultra-fine (0.1 micron) WC powder. Organic liquid of heptane was chosen as dispersing media to avoid possible oxidation of WC. The mixing apparatus was a key to obtain dense compacts. Only the slips mixed by high energy planetary ball mill were packed up to 55% by the HCP, and sintered to almost full density at 1673 K without any sintering aids. This sintered compact marked Vickers hardness of Hv 2750 at maximum.
Suzuki Hiroyuki Y.,Kuroki Hidenori 대한금속재료학회 2004 METALS AND MATERIALS International Vol.10 No.2
A new compacting method for powder materials is presented. High-speed Centrifugal Compaction Process (HCP) utilizes centrifugal force of about 10,000 g for the compaction. WCP is suitable for net shape compaction of fine sub-micron and nano-powders. HCP possesses a unique compacting mechanism that is different from other colloidal processes including Pressure Casting (PC), and has a number of useful characteristics. HCP has a higher compacting speed than PC, wide applicability for net shape formation, as well as a defect removing function. Because of homogeneous and flawless green microstructure, HCP alumina shows superior sinterability and higher strength and hardness than most of other aluminas.
Flow Patterns in Green Bodies Made by High-Speed Centrifugal Compaction Process
Suzuki Hiroyuki Y.,Urabe Katsuaki,Takano Tomoki,Kuroki Hidenori 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
High-Speed Centrifugal Compaction Process (HCP) is a wet compacting method, in which powders are compacted under a huge centrifugal force. The HCP was well applied to small alumina specimens, but the compact easily cracked when we applied the HCP to other materials. We clarified how the cracks introduced and found that the formation of such a flow pattern was related to the Colioli's force in the centrifugal field.